Title of Invention

"A STRUCTURE OF SUPPORT WALL FOR CRANKSNAFT"

Abstract To provide a means of simple structure for effectively collecting oil splashed onto the wall surface of a crankcase and effectively supplying the collected oil to a bearing in an internal combustion engine of the type in which the bearing of a crankshaft is supplied with oil splashed from nearby gears. [Solving Means] Ribs are radially mounted on a wall surface of a bearing support wall around an upper half of the bearing, for collecting oil which is splashed onto the wall surface and flows down the wall surface, or a slanted wall descending toward the bearing is formed on a bearing support wall disposed laterally of a lower portion of the bearing. [Selected Drawing] FIG. 3
Full Text Technical Field
The present invention relates to a structure of suport wall for crankshaft
The present invention relates to a lubricating structure for a bearing with splash oil feed. [Background Art] [0002]
Internal combustion engines of the type in which the bearings of a crankshaft are supplied with oil splashed from nearby gears are required to effectively collect oil splashed onto the wall surface of the crankcase and supply the collected oil to the bearings. There is known an arrangement in which an oil splash receiving means is provided above the bearings for collecting splashed oil and supplying the oil to the bearings through a communication hole defined in a lower portion of the oil splash receiving means (see, for example, Patent Document 1). However, the structure is complex because the separate oil splash receiving means needs to be mounted on the crankcase. [0003]
[Patent Document 1]
Japanese Patent Laid-Open No. Sho 58-112799 (FIGS. 2 and 3)
[Disclosure of the Invention] [Problems to be Solved by the Invention] [0004]
To provide a means of simple structure for effectively collecting oil splashed onto the wall surface of a crankcase and effectively supplying the collected oil to a bearing in an internal combustion engine of the type in which the bearing of a crankshaft is supplied with oil splashed from nearby gears. [Means for Solving the Problems] [0005]
The present invention has solved the above problems. According to an invention described in claim 1, there is provided a lubricating structure for a bearing with splash oil feed, characterized in that ribs are radially mounted on a wall surface of a bearing support wall around an upper half of the bearing, for collecting oil which is splashed onto the wall surface and flows down the wall surface. [0006]
According to an invention described in claim 2, there is provided a lubricating structure for a bearing

with splash oil feed, characterized in that a slanted wall descending toward the bearing is formed on a bearing support wall disposed laterally of a lower portion of the bearing. [0007]
According to an invention described in claim 3,

there is provided a lubricating structure for a bearing with splash oil feed, characterized in that ribs are radially mounted on a wall surface of a bearing support wall around an upper half of the bearing, for collecting oil which is splashed onto the wall surface and flows down the wall surface, and a slanted wall descending toward the bearing is formed on a bearing support wall disposed laterally of a lower portion of the bearing. [Effect of the Invention] [0008]
According to the invention described in claim 1, the oil which is splashed onto the wall surface of the crankcase can effectively be collected by a simple structure. According to the invention described in claim 2, the oil flowing from above can effectively be supplied to the bearing by a simple structure. According to the invention described in claim 3, the collection of the oil and the supply of the oil to the bearing can be combined for more effectively feeding the oil.
Accordingly there is provided a lubricating structure for a bearing with splash oil feed, characterized in that ribs are radially formed on a upper half support wall of a crankshaft support bearing in an internal combustion engine for collecting oil which is splashed onto the wall surface and flows down the wall surface.
[Brief Description of the Accompanying Drawings]
[FIG. 1]
FIG. 1 is a vertical cross-sectional view, a viewed from right, of an air-cooled internal combustion engine for a motorcycle according to the present invention;
[FIG. 2]
FIG. 2 is a cross-sectional view taken alone line II - III of FIG. 1;
[FIG. 3]
FIG. 3 is a cross-sectional view taken along line III - III of FIG. 1, showing right half components in a crankcase; [FIG. 4]
FIG. 4 is a view showing a region of a right crankcase as it is viewed from the right, according to the above embodiment; and [FIG. 5]
FIG. 5 is a cross-sectional view taken along line V - V of FIG. 4, showing at an enlarged scale a cross section of a crankshaft supporting section.
[Best Mode for Carrying out the Invention] [0009]
FIG. 1 is a vertical cross-sectional view, as viewed from right, of an air-cooled internal combustion engine for a motorcycle according to the present invention, the view showing the position of a rotational shaft projecting to the right of a right crankcase and the positions of some gears, with a right case cover of a transmission being omitted from illustration. FIG. 2 is a cross-sectional view taken alone line II - II of FIG. 1. In FIGS. 1 and 2, a crankcase assembly includes a left case cover 1; a left crankcase 2, a right crankcase 3, and a right case cover 4. A cylinder block 5, a cylinder head 6, and a cylinder head cover 7 are connected to an upper portion of the crankcase assembly. Designated at 10 is a crankshaft, 11 a main shaft of a transmission, 12 a countershaft of the transmission,/ 13 a kick starter shaft, 14 the position of a central axis about which a shift drum is rotatable, 15 a shifter of the transmission, 16 a balancer shaft, 17 an oil pump shaft, 18 a crankpin, 19 a connecting rod connected to the crankpin 18, and 20 a piston connected to the connecting rod 19. The piston 20 is vertically movable in the cylinder block 5.
[0010]
In FIG. 2, the crankshaft 10 is rotatably supported on the left crankcase 2 and the right crankcase 3 respectively by a ball bearing 21 and a roller bearing 22. The main shaft 11 and the countershaft 12 of the transmission are also supported on the left crankcase 2 and the right crankcase 3 by ball bearings. The kick starter shaft 13 is supported by the right crankcase 3 and the right case cover 4. The countershaft 12 serves as the output shaft of the internal combustion engine and has a portion projecting out of the left crankcase 2 and supporting a drive sprocket 23, which drives the rear wheel of the motorcycle through a chain 24. An alternator 39 is coupled to the left end of the crankshaft 10.
[0011]
A balancer drive gear 25 and a common drive gear 2 6 are fixed to a right portion of the crankshaft 10 by a key 27. The balancer drive gear 25 is held in mesh with a balancer driven gear 3 7 (FIG. 1) . The common drive gear 26 is held in mesh with a main shaft driven gear 28 on the main shaft 11 and an oil pump driven gear 44 on the oil pump shaft 17 (FIG. 1).
[0012]
In FIG. 2, the main shaft driven gear 28 which is
constantly held in mesh with the common drive gear 26 is fitted over a right portion of the main shaft 11, the main shaft driven gear 2 8 being circumferentially rotatable relatively to the main shaft 11. A multi-plate clutch 30, which is normally engaged, but disengageable when an actuating mechanism 29 is operated, is mounted on the right end of the main shaft 11. The multi-plate clutch 3 0 has a clutch outer member 31 fixed to the main shaft driven gear 28 and a clutch inner member 32 fixed to the main shaft 11. Rotation of the crankshaft 10 is transmitted through the common drive gear 26 to the main driven gear 28 and then through the multi-plate clutch 30 to the main shaft 11. [0013]
In FIG. 2, a transmission gear train 33 is mounted on the main shaft 11 and the countershaft 12. The transmission gear train 33 includes five gears mounted on the main shaft 11 and five gears mounted on the countershaft 12 and held in mesh with the five gears on the main shaft 11 at all times. These ten gears are classified into three types of different natures as follows: (a) gears fixed to a shaft, (b) gears held on a shaft by a slide bearing, and circumferentially rotatable relatively to the shaft but axially immovable, and (c)
gears held on a shaft by a spline, and axially movable but circumferentially nonrotatable relatively to the shaft. [0014]
The axially movable gears (c) provide a dog clutch and are axially moved by a shift fork (not shown) engaging the dog clutch at all times, into engagement with the relatively rotatable gears (b) which are positioned adjacent thereto, thus securing the gears (b) to the shaft. Such a set of gears for transmitting power is selectively created by the above operation for providing gear positions ranging from first to fifth gear positions. [0015]
A gear 34 on the kick starter shaft is capable of starting to rotate the crankshaft 10 through a gear 35 on the right end of the countershaft, a gear 36 on the right end of the main shaft, the main shaft driven gear 2 8 on the main shaft 11,- and the common drive gear 2 6 on the crankshaft. [0016]
FIG. 3 is a cross-sectional view taken along line III - III of FIG. 1, showing right half components in the crankcase. The crankshaft 10 has a right half portion
supported on the right crankcase 3 by the roller bearing 22 with a bushing 38 interposed between the right crankcase 3 and the roller bearing 22. As described above, the balancer drive gear 25 and the common drive gear 26 are mounted on the crankshaft 10 by the common key 27. [0017]
An oil pump 40 is disposed below the crankshaft 10. The oil pump 4 0 has a pump case 41 fastened to the right crankcase 3 by a steel plate 42 and a bolt 43. The oil pump shaft 17 is rotatably supported by the right crankcase 3 and a wall of the pump case 41. The oil pump driven gear 44 is fixed to the oil pump shaft 17 by a tenon 17a formed at the end of the oil pump shaft and a set plate 45. The oil pump driven gear 44 is held in mesh with the common drive gear 26. An oil pump rotor 46 is fitted over the oil pump shaft 17. When the crankshaft 10 is rotated, the oil pump rotor 46 is rotated by the common drive gear 26, the oil pump driven gear 44, the set plate 45, the tenon 17a, and the oil pump shaft 17. [0018]
FIG. 4 is a view showing a region of the right crankcase 3 as it is viewed from the right. The right crankcase 3 has a central through hole 50 through which the crankshaft extends. The solid line around the central
through hole 5 0 represents a peripheral .edge 51 of the central through hole 50. Although not shown, the roller bearing 22 is mounted in the right crankcase 3 on the other side of the peripheral edge 51. A wall surface 52 of the right crankcase 3 around an upper half of the bearing has four ribs 53 extending radially from the center of the central through hole 50. The ribs 53 are formed integrally with the right crankcase 3 when it is cast. The ribs 53 serve to collect oil splashed onto and flowing down the crankcase wall surface and guide the collected oil to the peripheral edge 51 of the central through hole 50. [0019]
FIG. 5 is a cross-sectional view taken along line V - V of FIG. 4, showing at an enlarged scale a cross section of the crankshaft supporting section shown in FIG. 3. FIG. 5 shows a region of the right crankcase 3, the roller bearing 22, and the bushing 38. The crankshaft 10 is omitted from illustration. The dot-and-dash line C - C represents the central line of the crankshaft. [0020]
In the crankcase 3, the cross-sectional shape of the peripheral edge 51 of the central through hole which is positioned laterally of the roller bearing 22 is
different in its upper and lower sides. Specifically, the peripheral edge 51 in its upper side has a normal-type cross-sectional shape A, and the peripheral edge 51 in its lower side has an oil-collecting-type cross-sectional shape B. The normal-type cross-sectional shape A has an inner peripheral surface parallel to the crankshaft axis and is beveled normally. The oil-collecting-type cross-sectional shape B has a slanted surface descending toward the roller bearing. As shown in FIG. 4, the normal-type cross-sectional shape A is applied to the peripheral edge 51 on the upper side and the left and right sides of the central through hole 50, and the oil-collecting-type cross-sectional shape B is applied to the peripheral edge 51 on the lower side of the central through hole only. The peripheral edge 51 of the oil-collecting-type cross-sectional shape B is capable of guiding oil toward the roller bearing 22. [0021] ,
Internal combustion engines of the type in which the crankshaft bearing is supplied with oil splashed from nearby gears, e.g., the balancer drive gear 25, the balancer driven gear 37, the common drive gear 26, the main shaft driven gear 28, and the oil pump driven gear 44, are required to effectively collect oil splashed onto
the wall surface of the crankcase and supply the collected oil to the bearing. [0022]
According to the present embodiment, oil splashed onto and flowing down the crankcase wall surface 52 around the upper half of the roller bearing 22 is collected by the ribs 53 (FIG. 4) toward the peripheral edge 51 having the normal-type cross-sectional shape A of the central through hole 50, allowed to flow along the peripheral edge 51, and then received by the peripheral edge 51 having the oil-collecting-type cross-sectional shape B on the lower portion of the central through hole 50 and laterally of the lower portion of the roller bearing 22. The oil is then guided to the roller bearing 22 along the slanted surface descending toward the roller bearing 22, and supplied to the roller bearing 22. Since the rollers of the roller bearing 22 move along the peripheral edge 51 of the central through hole 50, the supplied oil is distributed to all the rollers of the roller bearing 22. The smaller arrows 54 shown in FIGS. 4 and 5 represent the flow of the oil as it flows downwardly. [0023]
In the above embodiment, the present invention has
been described with respect to the bearing on the right crankcase. However, the present invention is also applicable to the bearing on the left crankcase. In the above embodiment, oil on the outer wall surface of the crankcase is collected and supplied to the bearing. However, it is possible, with the same means as described above, to collect oil on the inner wall surface of the crankcase and supply the collected oil to the bearing. While the peripheral edge 51 has both the ribs 53 and the oil-collecting-type cross-sectional shape B in the above embodiment, the peripheral edge 51 may have either the ribs 53 or the oil-collecting-type cross-sectional shape B.
[Description of Reference Characters] [0025]
A...Normal-type cross-sectional shape, B...Oil-collecting- type cross-sectional shape, 1...Left case cover, 2...Left crankcase, 3...Right crankcase, 4...Right case cover, 5...Cylinder block, 6...Cylinder head, 7...Cylinder head cover, 10...Crankshaft, 11...Main shaft, 12...Counter-shaft, 13...Kick starter shaft, 14..Position of central axis about which a shift drum is rotatable, 15...Shifter of transmission, 16...Balancer shaft, 17...Oil pump shaft, 17a...Tenon, 18...Crankpin, 19...Connecting rod, 20...Piston, 21...Ball bearing, 22...Roller bearing, 23...Drive sprocket, 24...Chain,
25...Balancer drive gear, 26...Common drive gear,
27...Key, 28...Main shaft driven gear, 29...Actuating
mechanism, 30...Multi-plate clutch, 31...Clutch outer
member, 32...Clutch inner member, 33...Transmission gear
train, 34...Gear on kick starter shaft, 35...Gear on
right end of countershaft, 36...Gear on right end of main
shaft, 37...Balancer driven shaft, 38...Bushing,
39...Alternator, 40...Oil pump, 41...Pump case,
42...Steel plate, 43...Bolt, 44...Oil pump driven gear,
45...Set plate, 46...Oil pump rotor, 50...Central through
hole, 51...Peripheral edge of central through hole,
52...Wall surface of right crankcase, 53...Rib, 54...Flow
of oil.





We claim:
1. A structure of support wall (52) for crankshaft, characterized in that ribs(53) are radially formed on a upper half support wall of a crankshaft, for collecting lubricating oil (54) which is splashed onto the wall-surface(52) and flows down the wall-surface(52).
2. A structure of support wall (52) for crankshaft (10) as claimed in claim 1, wherein said crankshaft on lower half support wall is provided with a slanted wall surface (B-51).
3. A structure of support wall (52) of crankshaft (10) as claimed in claim 1, wherein said upper half support wall for a crankshaft has four ribs (53).
4. A structure of support wall for crankshaft substantially as hereinbefore described with reference to the accompanying drawings.



Documents:

1625-del-2004-abstract.pdf

1625-del-2004-claims (31-08-2006).pdf

1625-del-2004-claims.pdf

1625-del-2004-complete specification(as files).pdf

1625-del-2004-complete specification(granted).pdf

1625-del-2004-correspondence-others.pdf

1625-del-2004-correspondence-po.pdf

1625-del-2004-description (complete).pdf

1625-del-2004-drawings.pdf

1625-del-2004-form-1.pdf

1625-del-2004-form-19.pdf

1625-del-2004-form-2.pdf

1625-del-2004-form-3.pdf

1625-del-2004-form-4.pdf

1625-del-2004-form-5.pdf

1625-del-2004-gpa.pdf

1625-del-2004-petition-137.pdf

1625-del-2004-petition-138.pdf

abstract.jpg


Patent Number 247457
Indian Patent Application Number 1625/DEL/2004
PG Journal Number 15/2011
Publication Date 15-Apr-2011
Grant Date 08-Apr-2011
Date of Filing 27-Aug-2004
Name of Patentee HONDA MOTOR CO., LTD.
Applicant Address 1-1, MINAMIAOYAMA 2-CHOME, MINATO-KU, TOKYO, JAPAN.
Inventors:
# Inventor's Name Inventor's Address
1 AKIRA TAKAHASHI C/O KABUSHIKI KAISHA HONDA GIJUTSU KENKYUSHO, 4-1 CHUO 1-CHOME, WAKO-SHI, SAITAMA, JAPAN.
2 HIDEMI YOKOYAMA C/O KABUSHIKI KAISHA HONDA GIJUTSU KENKYUSHO, 4-1 CHUO 1-CHOME, WAKO-SHI, SAITAMA, JAPAN.
3 FUMINORI MIZUTANI C/O KABUSHIKI KAISHA HONDA GIJUTSU KENKYUSHO, 4-1 CHUO 1-CHOME, WAKO-SHI, SAITAMA, JAPAN.
PCT International Classification Number F16C 33/66
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 2003-326554 2003-09-18 Japan