Title of Invention	A VEHICLE ALTERNATOR
Abstract	ABSTRACT The present invention is to provide a vehicle alternator capable of promptly discharging water coming into the interior thereof from a water discharge hole. The vehicle alternator includes a rear bracket which supports a rotary shaft driven by an engine at the rear end thereof, has a plurality of vent holes defined thereto and is mounted so that the main surface of the rear bracket faces in a vertical direction and the rear bracket includes a water discharge hole defined to a wall surface facing to the ground and a pair of guide portions continuously extending from the opening of the water discharge hole toward the ground in confrontation with each other.

Title of Invention

A VEHICLE ALTERNATOR

Abstract

ABSTRACT The present invention is to provide a vehicle alternator capable of promptly discharging water coming into the interior thereof from a water discharge hole. The vehicle alternator includes a rear bracket which supports a rotary shaft driven by an engine at the rear end thereof, has a plurality of vent holes defined thereto and is mounted so that the main surface of the rear bracket faces in a vertical direction and the rear bracket includes a water discharge hole defined to a wall surface facing to the ground and a pair of guide portions continuously extending from the opening of the water discharge hole toward the ground in confrontation with each other.

Full Text	The present invention relates to a vehicle alternator having a water discharge structure capable of promptly discharging water coming into the alternator. A vehicle alternator mounted to the engine of a vehicle is often splashed with water and in particular with muddy water when it is actually used. On the other hand, a vent hole is defined to the rear bracket as the casing of the alternator to radiate the heat generated by the generation of power. It is preferable that the vent hole is made as large as possible to improve a heat radiating property. Since, however, the vent hole cannot be made large from the view point of the role of the rear bracket for protecting the components accommodated therein and the necessity for securing the strength of the rear bracket itself, a plurality of the vent holes each having a proper size are defined. Such being the case, in the conventional alternator, since water such as muddy water and the like is liable to come into it through the vent holes, the alternator is provided with a water discharge hole defined to the lower side of the rear bracket to thereby effectively discharge water coming into it. FIG. 7 is a front elevational view of a rear bracket applied to a conventional alternator. In FIG. 7, the rear bracket 1 of the alternator has a plurality of vent holes la each having a proper size and defined thereto. A water discharge hole lb is defined to the lower side of the rear bracket 1. The water discharge hole lb is formed by cutting out the wall surface of the terminal mounting portion Ic of the rear bracket 1 as shown in FIG. 8. As shown in FIG. 9, the rear bracket 1 is disposed coaxially with a stator core 2 and journals a rotary shaft 3 driven by an engine 11 at the rear end thereof. A rectifier 4 is mounted to the terminal mounting portion 1c of the rear bracket 1. As shown in FIG. 11, the alternator 10 arranged as described above is mounted to the engine 11 so that the main surface of the rear bracket 1 faces in a vertical direction. The terminal mounting portion 1c is located on a lower side (ground side) and the opening of the water discharge hole lb faces downward. When the alternator 10 is splashed with water 5 such as muddy water and the like, the water 5 comes into the alternator 10 from the vent holes la. The water 5 having come into the alternator 10 flows along the inside wall surface of the rear bracket 1 and is discharged from the water discharge hole lb to the outside. In, for example, the terminal mounting portion 1c to which the rectifier 4 is mounted, the interval between the inside wall surface of the rear bracket 1 and the rectifier 4 is narrowed. Thus, when the water 5 comes into the terminal mounting portion 1c arranged as described above, the water 5 is deposited on the rectifier 4 by surface tension as shown in FIG. 10 and difficult to be discharged from the water discharge hole lb. When the water 5 contains many types of impurities such as mud and the like, they are dried without being discharged from the water discharge hole lb and clog the water discharge hole lb by the repetition of the above process. When the water discharge hole lb is clogged, since the water 5 having come into the alternator 10 stays there without being discharged, there is a problem that the water makes the components accommodated in the rear bracket 1 such as the rectifier 4 and the like to an unacceptable state and causes a voltage drop by the contact of the rear bracket 1 serving as the ground with the components, whereby the alternator becomes unable to produce power. An object of the present invention for solving the above problem is to provide an alternator having a water discharge structure capable of discharging water including impurities such as mud even if the water comes into the alternator and preventing the breakdown thereof which is caused by th^^t the impurities clog a water discharge hole and the water stays in the alternator. The present invention provides a vehicle altemator comprising a rear bracket which supports a rotary shaft driven by an engine at a rear end of the shaft, the bracket having a plurality of vent holes disposed thereto, and is mounted so that a main surface of the reaji' bracket faces in a vertical direction with respect to the ground, wherein the rear bracket having a water discharge hole; a pair of plate-like guide portions continuously extending from an opening in said water discharge hole towards the ground; wherein the guide portions face each other so as to enlarge a gap between said guide portions, and; wherein the relationship between a width of the opening A of the water discharge hole and a length B of the guide portions is set to B > 2A. Brief Description of the/Drawings FIG. 1 is a front elevational view showing a rear bracket applied to an alternator according to an embodiment 1 of the present invention; FIG. 2 is a perspective view showing the main portion of the rear bracket applied to the alternator according to the embodiment 1 of the present invention; FIG. 3 is a sectional view showing the main portion of the alternator according to an embodiment 1 of the present invention; FIG. 4 is a sectional view showing the main portion of the alternator according to the embodiment 1 of the present invention for explaining how water is discharged; FIG. 5 is a sectional view showing the main portion of a rear bracket applied to the alternator according to an embodiment 2 of the present invention; FIG. 5 is a front elevational view showing a rear bracket applied to the alternator according to an embodiment 3 of the present invention; FIG. 7 is a front elevational view showing a rear bracket applied to a conventional alternator; FIG. 8 is a perspective view showing the main portion of the rear bracket applied to the conventiojal., alte_r:ixator; FIG. 9 is a sectional view showing the main portion of the conventional alternator; FIG. 10 is a sectional view of the main portion of the conventional alternator for explaining how water is discharged; and FIG. 11 is a front elevational view showing the state that the conventional alternator is mounted to an engine. Best Mode for Canying Out the Invention Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Embodiment 1 FIG. 1 is a front elevational view showing a rear bracket applied to an alternator according to an embodiment 1 of the present invention, FIG. 2 is a perspective view of the rear bracket when it is viewed from a lower side, FIG. 3 is a sectional view showing the main portion of the altemator according to the embodiment 1 and FIG. 4 is a sectional view of the main portion of the altemator according to the embodiment 1 for explaining how water is discharged. In FIG. 1 and FIG. 2, a rear bracket 20 has a plurality of vent holes 20a each having a proper size, a terminal mounting portion 20b to which a rectifier is mounted, a brush holder accommodating unit 20c for accommodating a brush holder and the like which are disposed thereto. A water discharge hole 20d is disposed to the side wall surface of the terminal mounting portion 20b. Further, a pair of guide portions 20e continuously project outward from the opening of the water discharge hole 20d in confrontation with each other. Note, the width of the opening A of the water discharge hole 20d is set to 1.5 mm and the projecting length of the guide portions 20e is set to 5 mm. In FIG. 3, the rear bracket 20 is disposed coaxially with a stator core 2 and journals a rotary shaft 3 driven by an engine 11 at the rear end thereof. The rectifier 4 serving as an accommodated component is mounted to the terminal mounting portion 20b of the rear bracket 20. In addition, a brush holder 6 serving as an accommodated component is accommodated in the brush holder accommodating unit 20c. An alternator 21 arranged as described above is mounted to the engine 1 1 so that the main surface of the rear bracket 20 faces in a vertical direction. The terminal mounting portion 20b is positioned on a lower side, the opening of the water discharge hole 20d faces downward and the guide portions 20e extend in a ground direction. When the alternator 2 1 is splashed with water 5 such as muddy water and the like, the water 5 comes into the alternator 21 through the vent holes 20a. The water 5 having come thereinto flows along the inside wall surface of the rear bracket 20 and reaches the water discharge hole 20d. The water 5 having reached the water discharge hole 20d enters between the pair of guide portions 20e from the water discharge hole 20d by surface tension and stays to the lower portion between the pair of guide portions 20e. At the time, since the water 5 stays to the lower portion between the pair of guide portions 20e, there is a sufficient distance between the water 5 and the rectifier 4. Thus, when the amount of water 5 staying between the pair of guide portions 20e increases, the water 5 drops from between the pair of guide portions 20e by its dead load before it comes into contact with the rectifier 4. When the rear bracket 20 was made by variously combining the width of the opening A of the water discharge hole 20d with the projecting length B of the guide portions 20e and how water was discharged was observed, it could be confirmed that the water could be particularly promptly discharged when B ^ 2A. As described above, according to the embodiment 1, when the alternator 21 is mounted to the engine 11, since the water discharge hole 20d is disposed to the side wall surface of the terminal mounting portion 20b facing the ground which is located to the lower side of the rear bracket 20 and the pair of guide portions 20e continuously extend from the opening of the water discharge hole 20d downward (in the direction of the ground) , the water 5 having come into the alternator 21 is promptly discharged through the water discharge hole 20d and the pair of guide portions 20e and the water discharge hole 20d is not clogged. As a result, the unacceptable state of the accommodated components such as the rectifier 4 and the like and the occurrence of a voltage drop resulting from the contact of the rear bracket 20 serving as the ground and the accommodated components, which would be caused when the water 5 having come into the alternator 21 stays there without being discharged, can be prevented. Further, since the pair of the guide portions 20e continuously project outward from the opening of the water discharge hole 20d, the water discharge hole 20d and the pair of guide portions 20e can be molded integrally with the rear bracket 20 by casting. Therefore, the rear bracket 20 having the water discharge hole structure capable of promptly discharging water can be made without the need of special processing such as machining. Embodiment 2 FIG. 5 is a sectional view showing the main portion of a rear bracket applied to the alternator according to an embodiment 2 of the present invention. The embodiment 2 forms the inner peripheral edge of the opening of a water discharge hole 20d to a taper shape. The other arrangement of the embodiment 2 is the same as that of the embodiment 1. Water 5 having come into an alternator 21 from a vent holes 20a flows along the inside wall surface of a rear bracket 20 and reaches the water discharge hole 20d. The water 5 having reached the water discharge hole 20d flows between a pair of guide portions 20e from the tapered portion 20f of the opening of the water discharge hole 20d and at the same time enters between a pair of guide portions 20e by surface tension. Therefore, according to the embodiment 2, since the water 5 having reached the water discharge hole 20d can more easily flows between the guide portions 20e by the tapered shape of the inner peripheral edge of the opening of the water discharge hole 20d, the water does not stay in the vicinity of the water discharge hole 20d, by which a water discharging property can be improved. Embodiment 3 An embodiment 3 is applied when an altemator 21 is mounted to an engine 11 so that the brush holder accommodating unit 20c of a rear bracket 20 is located to a lower side. Then, a water discharge hole 20d is ' disposed to the side wall surface, which faces to the ground, of the brush holder accommodating unit 20c and a pair of guide portions 20e continuously extend from the opening of the water discharge hole 20d in the direction of the ground in confrontation with each other. Therefore, water 5 having entered from vent holes 20a is promptly discharged through the water discharge hole 20d and the pair of guide portions 20e also in the embodiment 3. Thus, the water discharge hole 20d is not clogged and an advantage similar to that of the embodiment 1 can be obtained. As described above, according to the present invention, the vehicle alternator of the present invention includes a rear bracket which supports a rotary shaft driven by an engine, at the rear end thereof, has a plurality of vent holes defined thereto and is mounted so that the main surface of the rear bracket faces in a vertical direction and the rear bracket includes a water discharge hole defined to a wall surface facing to the ground and a pair of guide portions continuously extending from the opening of the water discharge hole toward the ground in confrontation with each other. Accordingly, water having come into the alternator through the vent holes is promptly discharged to the outside through the water discharge hole and the pair of guide portions and the water discharge hole is not clogged. Thus, the unacceptable state of the accommodated components and the occurrence of a voltage drop resulting from the contact of the rear bracket serving as the ground and the accommodated components, which would be caused by the water which comes into the alternator and stays there without being discharged, can be prevented. Since the water discharge hole is defined to the side wall surface of the terminal mounting portion to which the accommodated components are mounted, the intervals between the accommodated components and the inside wall surface of the rear bracket are narrow and accordingly the water can be promptly discharged from the terminal mounting portion where the water is liable to stay. Since the rectifier is mounted to the terminal mounting portion, the failure of operation of the rectifier caused when it comes into contact with water can be prevented. Since the relationship between the width of the opening A of the water discharge hole and the extending length B of the guide portions is set to B ^ 2A, the water having come into the alternator can be promptly discharged. Further, since the opening edge of the water discharge hole is formed to the tapered shape, a water discharging property can be more improved. We Claim: 1. A vehicle alternator comprising a rear bracket which supports a rotary shaft driven by an engine at a rear end of the shaft, the bracket having a plurality of vent holes disposed thereto, and is mounted so that a main surface of the read bracket faces in a vertical direction with respect to the ground, wherein the rear bracket having a water discharge hole; a pair of plate-like guide portions continuously extending from an opening in said water discharge hole towards the ground; wherein the guide portions face each other so as to enlarge a gap between said guide portions, and; wherein the relationship between a width of the opening A of the water discharge hole and a length B of the guide portions is set to B > 2A. 2. A vehicle alternator according to claim 1, wherein an inner opening edge of said water discharge hole is formed in a tapered shape. 3. A vehicle alternator, substantially as hereinabove described and illustrated with reference to the figures 1 to 6 of the accompanying drawings.

Full Text

The present invention relates to a vehicle alternator having a water discharge structure capable of promptly discharging water coming into the alternator.
A vehicle alternator mounted to the engine of a vehicle is often splashed with water and in particular with muddy water when it is actually used. On the other hand, a vent hole is defined to the rear bracket as the casing of the alternator to radiate the heat generated by the generation of power. It is preferable that the vent hole is made as large as possible to improve a heat radiating property. Since, however, the vent hole cannot be made large from the view point of the role of the rear bracket for protecting the components accommodated therein and the necessity for securing the strength of the rear bracket itself, a plurality of the vent holes each having a proper size are defined. Such being the case, in the conventional alternator, since water such as muddy water and the like is liable to come into it through the vent holes, the alternator is provided with a water discharge hole defined to the lower side of the rear bracket to thereby effectively discharge water coming into it.
FIG. 7 is a front elevational view of a rear bracket applied to a conventional alternator.
In FIG. 7, the rear bracket 1 of the alternator

has a plurality of vent holes la each having a proper size and defined thereto. A water discharge hole lb is defined to the lower side of the rear bracket 1. The water discharge hole lb is formed by cutting out the wall surface of the terminal mounting portion Ic of the rear bracket 1 as shown in FIG. 8.
As shown in FIG. 9, the rear bracket 1 is disposed coaxially with a stator core 2 and journals a rotary shaft 3 driven by an engine 11 at the rear end thereof. A rectifier 4 is mounted to the terminal mounting portion 1c of the rear bracket 1.
As shown in FIG. 11, the alternator 10 arranged as described above is mounted to the engine 11 so that the main surface of the rear bracket 1 faces in a vertical direction. The terminal mounting portion 1c is located on a lower side (ground side) and the opening of the water discharge hole lb faces downward.
When the alternator 10 is splashed with water 5 such as muddy water and the like, the water 5 comes into the alternator 10 from the vent holes la. The water 5 having come into the alternator 10 flows along the inside wall surface of the rear bracket 1 and is discharged from the water discharge hole lb to the outside.
In, for example, the terminal mounting portion 1c to which the rectifier 4 is mounted, the interval between the inside wall surface of the rear bracket 1 and the rectifier 4 is narrowed. Thus, when the water 5 comes into the terminal mounting portion 1c arranged as described above, the water 5 is deposited on the rectifier 4 by surface tension as shown in FIG. 10 and difficult to be discharged from the water discharge hole lb. When the

water 5 contains many types of impurities such as mud and the like, they are dried without being discharged from the water discharge hole lb and clog the water discharge hole lb by the repetition of the above process. When the water discharge hole lb is clogged, since the water 5 having come into the alternator 10 stays there without being discharged, there is a problem that the water makes the components accommodated in the rear bracket 1 such as the rectifier 4 and the like to an unacceptable state and causes a voltage drop by the contact of the rear bracket 1 serving as the ground with the components, whereby the alternator becomes unable to produce power.
An object of the present invention for solving the above problem is to provide an alternator having a water discharge structure capable of discharging water including impurities such as mud even if the water comes into the alternator and preventing the breakdown thereof which is caused by th^^t the impurities clog a water discharge hole and the water stays in the alternator.
The present invention provides a vehicle altemator comprising a rear bracket which supports a rotary shaft driven by an engine at a rear end of the shaft, the bracket having a plurality of vent holes disposed thereto, and is mounted so that a main surface of the reaji' bracket faces in a vertical direction with respect to the ground, wherein the rear bracket having a water discharge hole; a pair of plate-like guide portions continuously extending from an opening in said water discharge hole towards the ground; wherein the guide portions face each other so as to enlarge a gap between said guide portions, and; wherein the relationship between a width of the opening A of the water discharge hole and a length B of the guide portions is set to B > 2A.

Brief Description of the/Drawings
FIG. 1 is a front elevational view showing a rear bracket applied to an alternator according to an embodiment 1 of the present invention;
FIG. 2 is a perspective view showing the main portion of the rear bracket applied to the alternator according to the embodiment 1 of the present invention;
FIG. 3 is a sectional view showing the main portion of the alternator according to an embodiment 1 of the present invention;
FIG. 4 is a sectional view showing the main portion of the alternator according to the embodiment 1 of the present invention for explaining how water is discharged;
FIG. 5 is a sectional view showing the main portion of a rear bracket applied to the alternator according to an embodiment 2 of the present invention;
FIG. 5 is a front elevational view showing a rear bracket applied to the alternator according to an embodiment 3 of the present invention;
FIG. 7 is a front elevational view showing a rear bracket applied to a conventional alternator;
FIG. 8 is a perspective view showing the main portion of the rear bracket applied to the conventiojal., alte_r:ixator;
FIG. 9 is a sectional view showing the main portion of the conventional alternator;
FIG. 10 is a sectional view of the main portion of the conventional alternator for explaining how water is discharged; and

FIG. 11 is a front elevational view showing the state that the conventional alternator is mounted to an engine.
Best Mode for Canying Out the Invention
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Embodiment 1
FIG. 1 is a front elevational view showing a rear bracket applied to an alternator according to an embodiment 1 of the present invention, FIG. 2 is a perspective view of the rear bracket when it is viewed from a lower side, FIG. 3 is a sectional view showing the main portion of the altemator according to the embodiment 1 and FIG. 4 is a sectional view of the main portion of the altemator according to the embodiment 1 for explaining how water is discharged.
In FIG. 1 and FIG. 2, a rear bracket 20 has a plurality of vent holes 20a each having a proper size, a terminal mounting portion 20b to which a rectifier is mounted, a brush holder accommodating unit 20c for accommodating a brush holder and the like which are disposed thereto. A water discharge hole 20d is disposed to the side wall surface of the terminal mounting portion 20b. Further, a pair of guide portions 20e continuously project outward from the opening of the water discharge hole 20d in confrontation with each other. Note, the width of the opening A of the water discharge hole 20d is set to 1.5 mm and the projecting length of the guide portions 20e is set to 5 mm.
In FIG. 3, the rear bracket 20 is disposed

coaxially with a stator core 2 and journals a rotary shaft 3 driven by an engine 11 at the rear end thereof. The rectifier 4 serving as an accommodated component is mounted to the terminal mounting portion 20b of the rear bracket 20. In addition, a brush holder 6 serving as an accommodated component is accommodated in the brush holder accommodating unit 20c.
An alternator 21 arranged as described above is mounted to the engine 1 1 so that the main surface of the rear bracket 20 faces in a vertical direction. The terminal mounting portion 20b is positioned on a lower side, the opening of the water discharge hole 20d faces downward and the guide portions 20e extend in a ground direction.
When the alternator 2 1 is splashed with water 5 such as muddy water and the like, the water 5 comes into the alternator 21 through the vent holes 20a. The water 5 having come thereinto flows along the inside wall surface of the rear bracket 20 and reaches the water discharge hole 20d. The water 5 having reached the water discharge hole 20d enters between the pair of guide portions 20e from the water discharge hole 20d by surface tension and stays to the lower portion between the pair of guide portions 20e. At the time, since the water 5 stays to the lower portion between the pair of guide portions 20e, there is a sufficient distance between the water 5 and the rectifier 4. Thus, when the amount of water 5 staying between the pair of guide portions 20e increases, the water 5 drops from between the pair of guide portions 20e by its dead load before it comes into contact with the rectifier 4.

When the rear bracket 20 was made by variously combining the width of the opening A of the water discharge hole 20d with the projecting length B of the guide portions 20e and how water was discharged was observed, it could be confirmed that the water could be particularly promptly discharged when B ^ 2A.
As described above, according to the embodiment 1, when the alternator 21 is mounted to the engine 11, since the water discharge hole 20d is disposed to the side wall surface of the terminal mounting portion 20b facing the ground which is located to the lower side of the rear bracket 20 and the pair of guide portions 20e continuously extend from the opening of the water discharge hole 20d downward (in the direction of the ground) , the water 5 having come into the alternator 21 is promptly discharged through the water discharge hole 20d and the pair of guide portions 20e and the water discharge hole 20d is not clogged. As a result, the unacceptable state of the accommodated components such as the rectifier 4 and the like and the occurrence of a voltage drop resulting from the contact of the rear bracket 20 serving as the ground and the accommodated components, which would be caused when the water 5 having come into the alternator 21 stays there without being discharged, can be prevented.
Further, since the pair of the guide portions 20e continuously project outward from the opening of the water discharge hole 20d, the water discharge hole 20d and the pair of guide portions 20e can be molded integrally with the rear bracket 20 by casting. Therefore, the rear bracket 20 having the water discharge hole structure capable of promptly discharging water can be made without

the need of special processing such as machining. Embodiment 2
FIG. 5 is a sectional view showing the main portion of a rear bracket applied to the alternator according to an embodiment 2 of the present invention.
The embodiment 2 forms the inner peripheral edge of the opening of a water discharge hole 20d to a taper shape. The other arrangement of the embodiment 2 is the same as that of the embodiment 1.
Water 5 having come into an alternator 21 from a vent holes 20a flows along the inside wall surface of a rear bracket 20 and reaches the water discharge hole 20d. The water 5 having reached the water discharge hole 20d flows between a pair of guide portions 20e from the tapered portion 20f of the opening of the water discharge hole 20d and at the same time enters between a pair of guide portions 20e by surface tension.
Therefore, according to the embodiment 2, since the water 5 having reached the water discharge hole 20d can more easily flows between the guide portions 20e by the tapered shape of the inner peripheral edge of the opening of the water discharge hole 20d, the water does not stay in the vicinity of the water discharge hole 20d, by which a water discharging property can be improved.
Embodiment 3
An embodiment 3 is applied when an altemator 21 is mounted to an
engine 11 so that the brush holder accommodating unit 20c of a rear bracket
20 is located to a lower side. Then, a water discharge hole 20d is '

disposed to the side wall surface, which faces to the ground, of the brush holder accommodating unit 20c and a pair of guide portions 20e continuously extend from the opening of the water discharge hole 20d in the direction of the ground in confrontation with each other.
Therefore, water 5 having entered from vent holes 20a is promptly discharged through the water discharge hole 20d and the pair of guide portions 20e also in the embodiment 3. Thus, the water discharge hole 20d is not clogged and an advantage similar to that of the embodiment 1 can be obtained.
As described above, according to the present invention, the vehicle alternator of the present invention includes a rear bracket which supports a rotary shaft driven by an engine, at the rear end thereof, has a plurality of vent holes defined thereto and is mounted so that the main surface of the rear bracket faces in a vertical direction and the rear bracket includes a water discharge hole defined to a wall surface facing to the ground and a pair of guide portions continuously extending from the opening of the water discharge hole toward the ground in confrontation with each other. Accordingly, water having come into the alternator through the vent holes is promptly discharged to the outside through the water discharge hole and the pair of guide portions and the water discharge hole is not clogged. Thus, the unacceptable state of the accommodated components and the occurrence of a voltage drop resulting from the contact of the rear bracket serving as the ground and the accommodated components, which would be caused by the

water which comes into the alternator and stays there without being discharged, can be prevented.
Since the water discharge hole is defined to the side wall surface of the terminal mounting portion to which the accommodated components are mounted, the intervals between the accommodated components and the inside wall surface of the rear bracket are narrow and accordingly the water can be promptly discharged from the terminal mounting portion where the water is liable to stay.
Since the rectifier is mounted to the terminal mounting portion, the failure of operation of the rectifier caused when it comes into contact with water can be prevented.
Since the relationship between the width of the opening A of the water discharge hole and the extending length B of the guide portions is set to B ^ 2A, the water having come into the alternator can be promptly discharged.
Further, since the opening edge of the water discharge hole is formed to the tapered shape, a water discharging property can be more improved.

We Claim:
1. A vehicle alternator comprising a rear bracket which supports a rotary
shaft driven by an engine at a rear end of the shaft, the bracket having a plurality
of vent holes disposed thereto, and is mounted so that a main surface of the read
bracket faces in a vertical direction with respect to the ground, wherein the rear
bracket having a water discharge hole; a pair of plate-like guide portions
continuously extending from an opening in said water discharge hole towards
the ground; wherein the guide portions face each other so as to enlarge a gap
between said guide portions, and; wherein the relationship between a width of
the opening A of the water discharge hole and a length B of the guide portions
is set to B > 2A.
2. A vehicle alternator according to claim 1, wherein an inner opening edge
of said water discharge hole is formed in a tapered shape.
3. A vehicle alternator, substantially as hereinabove described and
illustrated with reference to the figures 1 to 6 of the accompanying drawings.

Documents:

2246-mas-1997 abstract duplicate.pdf

2246-mas-1997 abstract.pdf

2246-mas-1997 claims duplicate.pdf

2246-mas-1997 claims.pdf

2246-mas-1997 correspondence-others.pdf

2246-mas-1997 correspondence-po.pdf

2246-mas-1997 description (complete) duplicate.pdf

2246-mas-1997 description (complete).pdf

2246-mas-1997 drawings duplicate.pdf

2246-mas-1997 drawings.pdf

2246-mas-1997 form-1.pdf

2246-mas-1997 form-19.pdf

2246-mas-1997 form-26.pdf

2246-mas-1997 form-4.pdf

2246-mas-1997 petition.pdf

« Previous Patent

Next Patent »

Patent Number

196438

Indian Patent Application Number

2246/MAS/1997

PG Journal Number

33/2010

Publication Date

13-Aug-2010

Grant Date

Date of Filing

09-Oct-1997

Name of Patentee

MITSUBISHI DENKI KABUSHIKI KAISHA

Applicant Address

2-3, MARUNOUCHI 2-CHOME, CHIYODA-KU, TOKYO 100 JAPAN

Inventors:

#	Inventor's Name	Inventor's Address
1	KEIICHI MIYAMOTO	C/O MITSUBISHI DENKI KABUSHIKI KAISHA 2-3, MARUNOUCHI 2-CHOME, CHIYODA-KU, TOKYO 100 JAPAN
2	TSUNEJI GODA	C/O MITSUBISHI DENKI KABUSHIKI KAISHA 2-3, MARUNOUCHI 2-CHOME, CHIYODA-KU, TOKYO 100 JAPAN
3	KATSUMI ADACHI	C/O MITSUBISHI DENKI KABUSHIKI KAISHA 2-3, MARUNOUCHI 2-CHOME, CHIYODA-KU, TOKYO 100 JAPAN

PCT International Classification Number

H02J7/14

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA