Title of Invention

"HANDLE STRUCTURE FOR MOTORCYCLE"

Abstract A handle structure for motorcycle, comprising a handle post Y-shaped in front view and fixed to a steering shaft of the motorcycle, and a handle bar having left and right side portions and a lower portion supported on said handle post respectively through elastic members, wherein upper support portions supporting said left and right side portions of said handle bar are disposed on the front side of the axis of said steering shaft and a lower support portion supporting said lower portion of said handle bar is disposed on the rear side of said axis of said steering shaft, characterized in that said elastic members disposed at the upper support portions are fastened so that their damping direction coincides with the front-rear direction of the motorcycle, said elastic member disposed at the lower support portion is fastened from the rear side, and said Y-shaped handle post comprises both arm portions formed by bending a pipe on a base portion fitted to the steering shaft.
Full Text DESCRIPTION
TECHNICAL FIELD
The present invention relates to a handle structure for motorcycle.
BACKGROUND ART
As a handle structure for motorcycle, there has been, for example, one disclosed in the publication "Handle Fitting Structure for Motorcycle or the Like" of Japanese Patent No. 2552839. In the handle fitting structure for motorcycle and the like, as shown in Fig. 3 of the publication, a bracket 6 is fitted to a steering shaft 7 with a fastener 8. In addition, as shown in Fig. 2 of the publication, fitting brackets 12, 12, 12 of a bar handle 4 are fitted to the bracket 6 through rubber members 9, 9, 9.
Thus, in the handle fitting structure of the publication, the bar handle 4 is supported at three points, so that fluctuations in the front-rear direction can be prevented without needless fastening, and the vibration-isolating effect of the rubber members 9, 9, 9 is not reduced. Therefore, vibration transmitted to the bar handle 4 can be alleviated.
In the handle fitting structure of the publication, however, the rubber member 9 is easily elastically deformed in the shear direction in the case where forces in the front-rear direction act on the bar handle 4, so that the vibration-isolating performance may be lowered under such forces shaking in the front-rear direction.
In addition, although the handle fitting structure of
the publication is preferable for up-down vibrations, the rubber member 9 is too soft against front-rear vibrations, and the vibration-isolating performance may be lowered.
Further, the bracket 6 and the fitting brackets 12, 12 are projected greatly forwards with reference to the axis of the steering shaft 7. Where the projection amount of the fastening portions is large, a handle cover must be large. Particularly, various equipments such as lights and meters are disposed around the handle, so that the handle cover must be of a large type in order to encase these equipments without interference.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a handle structure for motorcycle which reduces the inclination in the front-rear direction of the handle bar under forces in the front-rear direction, prevents interference of fastening portions for fitting the handle, and absorbs the vibration in the front-rear direction transmitted to the handle.
According to the present invention, there is provided a handle structure for motorcycle in which a handle post Y-shaped in front view is fixed to a steering shaft, and left and right side portions and a lower portion of a handle bar are supported on the handle post respectively through elastic members, wherein left and right upper portion support portions for supporting the left and right side portions of the handle bar are disposed on the front side of the axis of the steering shaft, and the elastic members are fastened in the front-rear direction, whereas a lower portion support portion for supporting the lower portion of the handle bar is disposed on the rear side of the axis of the steering shaft, and the
elastic member is fastened from the rear side.
Thus, according to the present invention, the left and right elastic members are disposed to be fastened in the front-rear direction on the front side of the axis of the steering shaft, and the elastic member is disposed to be fastened from the rear side on the rear side of the axis, so that the elastic members at three points support the handle bar while undergoing elastic deformation in the compression direction under forces in the front-rear direction. As a result, the moving amount of the handle bar due to elastic deformation of the elastic members is small, and the inclination in the front-rear direction of the handle bar is small.
Further, the upper portion support portions of the handle bar have a structure of fastening the elastic members in the front-rear direction, so that the projection amount thereof projecting to the front side from the handle bar is small, and they do not interfere with electrical equipments such as a left front winker and a right front winker.
Furthermore, the elastic members are fitted to the upper portion support portions so as to be fastened in the front-rear direction, and the elastic member is fitted to the lower portion support portion so as to be fastened from the rear side, so that the elastic members undergo elastic deformation in the compression direction under vibrations in the front-rear direction, thereby absorbing the vibrations. Therefore, vibration-isolating performance is enhanced.
In the present invention, a roughly horizontal engine with a cylinder directed forwards is suspended at a lower portion of a main frame of the motorcycle. By directing the
cylinder forwards and suspending the roughly horizontal engine, vibration in the up-down direction generated at the engine is reduced, and up-down vibration transmitted from the main frame to the handle bar is reduced. In addition, in cooperation with the elastic members fastened in the front-rear direction, the arrangement of the engine can effectively absorb the vibration in the front-rear direction of the engine and can prevent the vibration from being transmitted to the handle. Further, in the present invention, a fitting portion for a handle cover is provided at the lower portion support portion of the handle bar. By providing the fitting portion for the handle cover at the lower portion support portion, the fitting portion is produced as one body with the lower portion support portion, whereby the number of component parts is reduced. In addition, since the three fastening points for the handle cover can all be provided on the handle bar, it is needless to fit the fitting portions separately to the elastic members.
Furthermore, in the present invention, a handle post is so constructed that both arm portions formed by bending a pipe is fitted on a base portion fitted to the steering shaft. By fitting both arm portions formed by bending a pipe, strength of both arm portions is secured. As a result, the shape of both arm portions is made simple, and reductions in the weight and size of the handle post can be contrived.
Accordingly, the present invention relates to a handle structure for motorcycle, comprising a handle post Y-shaped in front view and fixed to a steering shaft of the motorcycle, and a handle bar having left and right side portions and a lower portion supported on said handle post respectively through elastic members, wherein upper support portions supporting said left and right side portions of said handle bar are disposed on the front side of the axis of said steering shaft and a lower support portion supporting said lower portion of said handle bar is disposed on the rear side of said axis of said steering shaft, characterized in that said elastic members disposed at the upper support portions are fastened so that their damping direction coincides with the front-rear direction of the motorcycle, said elastic member disposed at the lower support portion is fastened from the rear side, and said Y-shaped handle post comprises both arm portions formed by bending a pipe on a base portion fitted to the steering shaft. BRIEF DESCRIPTION OF THE DRAWINGS:
Fig. 1 is a side view of a motorcycle employing the handle
structure according to the present invention;
Fig. 2 is a view as seen m the direction of arrows 2, 2 of
Fig. 1;
Fig. 3 is a view as seen in the direction of arrows 3, 3 of Fig. 1;
Fig. 4 is a side view of a handle structure according to the present invention; and
Fig. 5 is a perspective view of a handle post and a handle bar according to the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
Fig. 1 is a side view of a motorcycle adopting the handle structure according to the present invention. The motorcycle 10 comprises a vehicle body frame 13 comprising a main frame 11 and a rear frame 12 fitted to a rear portion of the main frame 11, and is a vehicle in which a head pipe 15 is provided at a front portion of the main frame 11, a front fork 16 is steerably fitted to the head pipe 15, a front wheel 17 fitted to the lower end of the front fork 16, a handle 18 is fitted to the upper end of the front fork 16, an engine 21 is suspended at a lower portion of the main frame 11, a swing arm 22 is swingably fitted to the lower portion of the main frame 11, a rear wheel 23 is fitted to the rear end of the swing arm 22, the lower ends of a pair of rear cushion units 24, 24 (symbol 24 on the deep side is not shown) are fitted to the rear end of the swing arm 22, the upper ends of the rear cushion units 24, 24 are fitted to the rear frame 12, and a fuel tank 25 and a seat 26 are fitted to the rear frame 12.
In the figure, numeral 31 denotes a head light, 32 denotes a handle cover, 33 denotes a handle post, 34 denotes a handle bar, 35 denotes a front cover, 36 denotes a leg shield, 37 denotes a front fender, and 38 denotes a side cover.
The engine 21 is a roughly horizontal engine in which a cylinder block 39 as a cylinder is inclined roughly
horizontally to the front side and directed forwards. Symbol 21a denotes an air cleaner, and 21b denotes an exhaust device.
Fig. 2 is a view taken along arrow 2-2 of Fig. 1, and shows the handle structure for motorcycle according to the present invention.
The handle structure comprises the handle post 33 Y-shaped in front view which is fixed to a steering shaft 41 in the head pipe 15, and the handle bar 34 having a left side portion 42, a right side portion 43 and a lower portion 44 which are supported on the handle post 33. Numeral 45 denotes a left front winker provided adjacently to the head light 31, 46 denotes a right front winker, 47, 47 denote grips, 48, 48 denote levers, and 49 denotes a rear view mirror.
Fig. 3 is a view taken along arrow 3-3 of Fig. 1, and shows a layout in which the left side portion 42 and the right side portion 43 of the handle bar 34 are fitted to the handle post 33, and the left and right front winkers 45, 46 are disposed on the front side of the left side portion 42 and the right side portion 43. Numerals 51, 51 denote bulbs for winkers, and 52 denotes meters such as a speed meter.
As shown in the figure, electrical equipments such as the meters 52, the head light 31 and the left and right front winkers 45, 46 are mounted in proximity to each other, whereby enhanced productivity can be contrived, and a reduction in size can be contrived.
Fig. 4 is a side view of the handle structure according to the present invention, and shows a construction in which the handle post 33 is fixed to the steering shaft 41 by a fixing means 55, and the left side portion 42, the right side portion 43 (See Fig. 3) and the lower portion 44 of the handle
bar 34 are supported on the handle post 33 respectively through elastic members 56, 56 (not shown in the figure), 57. Numeral 58 denotes the axis of the steering shaft 41.
The handle post 33 has a structure in which both arm portions 63, 63 (not shown in the figure) formed by bending a pipe 62 are fitted on a base portion 61 fitted to the steering shaft 41, fitting members 64, 64 (not shown in the figure) are fitted to the both arm portions 63, 63 on the front side (the direction of arrow a) of the axis 58 of the steering shaft 41, and a connecting member 65 is fitted to the center on the rear side (the direction of arrow b) of the axis 58 of the steering shaft 41. Numeral 66 denotes a clip for supporting cables.
The handle bar 34 has a construction in which upper portion support portions 71, 71 (not shown in the figure) fitted to upper portions on the front side of the axis 58 of the steering shaft 41, elastic members 56 are fastened with bolts 72 in the front-rear direction, a lower portion support portion 73 is fitted to a lower portion on the rear side of the axis 58 of the steering shaft 41, and an elastic member 57 is fastened with a bolt 74 from the rear side. Numeral 75 denotes a fitting portion for the handle cover 32 provided at the lower portion support portion 73, 76 denotes an angle piece for supporting component parts such as the handle cover 32 provided at an upper portion, 77 denotes a mirror fitting portion, and 78 denotes a lever support portion.
The handle cover 32 is constituted of a front cover 32a and a rear cover 32b. The rear cover 32b comprises a first seat portion 32c provided on the lower side, second and third seat portions 32d, 32e (not shown in the figure) provided at the center, and a cover joint portion 32f provided on the

crupper side. Numeral 91 denotes a small screw, and 92 and 93
denote tapping screws. The third seat portion 32e has the
same form as the second seat portion 32d.
Fig. 5 is a perspective view of the handle post and the handle bar according to the present invention, and shows the both arm portions 63, 63, and the fitting members 64, 64 of the handle post 33, as well as the upper portion support portions 71, 71, the angle pieces 76, 76, and the elastic members 56, 56 of the handle bar 34.
The elastic member 56 has a groove 81 in the center of the outer periphery. Similarly, the elastic member 57 has a groove 82 in the outer periphery.
The fitting member 64 of the handle post 33 is provided with a hole 83 into which the groove 81 of the elastic member 56 is fitted. Numerals 84, 84 denote collars fitted into the elastic members 56.
The lower portion support portion 73 of the handle bar 34 is provided with a hole 85 into which the groove 82 of the elastic member 57 is fitted. Numeral 86 denotes a collar fitted into the elastic member 57.
The fitting portion 75 for the handle cover 32 is a plate piece formed integrally and continuously to the lower side of the lower portion support portion 73, and is provided with a hole 87 and a nut 88 at the center.
Here, one example of mounting procedures will be explained. First, the handle post 33 and the handle bar 34 are assembled through the elastic members 56, 56, 57 as indicated by arrows, then these are fitted to the steering shaft with the fixing means 55 (washers 55a, 55b, a bolt 55c, a rotation stopper 55d), and thereafter, component parts such
as electrical equipments are mounted. Finally, the handle cover 32 is fitted.
In the case of fitting the handle cover 32, as shown in Fig. 4, first, the first seat portion 32c of the rear cover 32b is fitted to the fitting portion 75 for the handle cover 32 with the small screw 91, the second and third seat portions 32d, 32e are fitted to the angle pieces 76, 76 with the tapping screws 92, 92, and all the three fastening points of the first to third seat portions 32c, 32d, 32e are fitted to the handle bar 34. Next, the front cover 32a is fitted to the cover joint portion 32f of the rear cover 32b with the tapping screw 93.
The action or effect of the handle structure for motorcycle described above will be described below.
As shown in Fig. 4, when forces F act on the handle bar
34 as indicated by arrows (1), the forces F are supported by two points at the upper portion support portions 71, 71 (See Fig. 5) disposed on the front side of the axis 58 of the steering shaft 41 and one point at the lower portion support portion 73 disposed on the rear side of the axis 58, namely, by a total of three points, and the forces F are supported by elastic deformation in compression direction of the elastic members 56, 56, 57 fastened in the front-rear direction, so that the inclinations Of and Or of the handle bar 34 in the forward direction (direction of arrow (2) and the rearward direction (direction of arrow (3) can be reduced.
In addition, since the upper portion support portions 71, 71 (See Fig. 3) of the handle bar 34 have a construction in which the elastic members 56, 56 are fastened in the front-rear direction, the projection amount Lf projecting forward
from the handle bar 34 can be reduced. As a result, a large space can be provided on the front side of the handle bar 34, and it is possible to obviate interference between the upper portion support portions 71, 71 and electrical equipments such as the meters 52, the head light 31, and the bulbs 51, 51 of the left front winker 45 and the right front winker 46 (See Fig. 3) inside the handle cover 32.
Further, the upper portion support portions 71, 71 of the handle bar 34 have a structure in which the elastic members 56, 56 are fastened in the front-rear direction, and the lower portion support portion 73 has a structure in which the elastic member 57 is fastened from the rear side. Therefore, when vibrations in the front-rear direction as indicated by arrows ® are transmitted from the main frame 11 to the handle post 33, the elastic members 56, 56, 57 can absorb the vibrations in the front-rear direction by elastic deformation in the compression direction, so that the vibrations in the front-rear direction can be absorbed effectively.
As shown in Fig. 1, the roughly horizontal engine with the cylinder block 39 directed forwards is suspended at a lower portion of the main frame 11 of the motorcycle 10, so that up-down vibrations generated from the engine 21 can be reduced. Namely, the sources of the up-down vibrations can be reduced, the up-down vibrations can be alleviated, and the up-down vibrations can be absorbed by the handle structure according to the present invention.
As shown in Fig. 4, the fitting portion 75 for the handle cover 32 is provided at the lower portion support portion 73 of the handle bar 34, so that it is unnecessary to
separately produce a member for supporting a lower portion of the handle cover 32, the number of component parts is reduced, labor can be saved, and production cost can be cut down.
In addition, since the handle cover 32 (front cover 32a and rear cover 32b) is fitted to the fitting portion 75 for the handle cover 32 and the angle pieces 76, 76 (See Fig. 5) of the handle bar 34, vibrations can be isolated by the elastic members 56, 56, 57, it is unnecessary to fit the handle cover 32 to a vibration-isolating means such as another elastic member, and production cost can be cut down.
The handle post 33 of Fig. 4 has a structure in which the both arm portions 63, 63 formed by bending the pipe 62 are fitted on the base portion 61 fitted to the steering shaft 41, so that strength can be secured with a simple shape, reductions in weight and size can be contrived, and interference with other component parts can be obviated.
Incidentally, the shape of the elastic members 56, 56, 57 shown in the mode of carrying out the invention is not limited to the shown shape, and is arbitrary. For example, a plate may be adhered to the elastic member, and adjustment of hardness according to the shape of the elastic member can also be made.
While the handle post 33 is Y-shaped, the shape of the handle post is not limited to the Y shape.
The shapes of the upper portion support portions 71, 71 and the lower portion support portion 73 of the handle bar 34 are arbitrary.
INDUSTRIAL APPLICABILITY The present invention provides a structure in which the left and right upper portion support portions for supporting
the left and right side portions of the handle bar are disposed on the front side of the axis of the steering shaft, the elastic members are fastened in the front-rear direction, the lower portion support portion for supporting the lower portion of the handle bar is disposed on the rear side of the axis of the steering shaft, and the elastic member is fastened from the rear side, so that when forces in the front-rear direction are exerted horizontally on the handle bar, the forces are supported by two points of the upper portion support portions disposed on the front side of the axis of the steering shaft and one point of the lower portion support portion disposed on the rear side of the axis, namely, by a total of three points, and the forces are supported by elasticity in the compression direction of the elastic members fastened in the front-rear direction, resulting in that the inclinations of the handle bar in the forward direction and the rearward direction can be reduced.
In addition, since the upper portion support portions of the handle bar have the structure in which the elastic members are fastened in the front-rear direction, the projection amount projecting forwards from the handle bar can be reduced. As a result, a large space can be provided on the front side of the handle bar, and it is possible to obviate interference between the upper portion support portions and the electrical equipments such as the meters, the head light, the left front winker and the right front winker which are disposed inside the handle cover.
Further, the upper portion support portions of the handle bar have the structure in which the elastic members are fastened in the front-rear direction and the lower portion
support portion has the structure in which the elastic member is fastened from the rear side, so that when vibrations in the front-rear direction are transmitted from the main frame to the handle post, the elastic members can absorb the front-rear vibrations by elastic deformation in the compression direction, whereby the vibrations in the front-rear direction can be effectively absorbed.
Furthermore, the present invention provides a structure in which the roughly horizontal engine with the cylinder directed forwards is suspended at a lower portion of the main frame of the motorcycle, so that up-down vibrations generated from the engine can be reduced, and up-down vibrations transmitted to the handle bar can be reduced. In addition, in cooperation with the elastic members fastened in the front-rear direction, vibrations of the engine in the front-rear direction can be absorbed effectively, and vibrations transmitted to the handle bar can be reduced.
Further, the present invention provides a structure in which the fitting portion for the handle cover is provided at the lower portion support portion of the handle bar, so that it is unnecessary to separately produce a member for supporting a lower portion of the handle cover, and production cost can be cut down. Besides, a lower portion of the handle cover is supported on the fitting portion for the handle cover and an upper portion of the handle cover is supported on the handle bar, whereby vibrations of the handle cover can be suppressed, it is unnecessary to separately provide a fitting portion for fitting the handle cover, and production cost can be cut down.
Furthermore, the present invention provides a structure
in which the handle post comprises both arm portions formed by
bending a pipe on the upper side fitted on the base portion
fitted to the steering shaft, so that strength can be secured
with a simple shape, reductions in weight and size can be
contrived, and interference with other component parts can be
obviated.
Thus, according to the present invention, inclinations
of the handle bar in the front-rear direction under forces in
the front-rear direction are reduced, interference of the
fastening portions for fitting the handle is prevented, and
vibrations in the front-rear direction transmitted to the
handle are absorbed, so that the structure is of use as a
handle structure for motorcycle.






We Claim:
1. A handle structure for motorcycle, comprising a handle post (33) Y-shaped in front view and fixed to a steering shaft (41) of the motorcycle (10) , and a handle bar (34) having left and right side portions (42, 43) and a lower portion (44) supported on said handle post (33) respectively through elastic members (56, 57), wherein upper support portions (71, 71) supporting said left and right side portions (42, 43) of said handle bar (34) are disposed on the front side of the axis of said steering shaft (41) and a lower support portion (73) supporting said lower portion (44) of said handle bar (34) is disposed on the rear side of said axis of said steering shaft (41), characterized in that said elastic members (56, 56) disposed at the upper support portions (71, 71) are fastened so that their damping direction coincides with the front-rear direction of the motorcycle (10), said elastic member (57) disposed at the lower support portion (73) is fastened from the rear side, and said Y-shaped handle post (33) comprises both arm portions (63,63) formed by bending a pipe (62) on a base portion (61) fitted to the steering shaft (41).
2. A handle structure for motorcycle as claimed in claim 1, wherein a roughly horizontal engine (21) with a cylinder directed forwards is suspended at a lower portion of a main frame (11) of said motorcycle (10).
3. A handle structure for motorcycle as claimed in claim 1, wherein a fitting portion (75) for a handle cover (32) is provided at said lower
portion support portion (73) of said handle bar (34).
4. A handle structure for motorcycle substantially as herein described with reference to and as illustrated in the accompanying drawings.

Documents:

2040-delnp-2003-abstract.pdf

2040-delnp-2003-claims.pdf

2040-DELNP-2003-Correspondence Others-(22-03-2011).pdf

2040-delnp-2003-correspondence-others.pdf

2040-delnp-2003-correspondence-po.pdf

2040-delnp-2003-description (complete).pdf

2040-delnp-2003-drawings.pdf

2040-delnp-2003-form-1.pdf

2040-delnp-2003-form-19.pdf

2040-delnp-2003-form-2.pdf

2040-DELNP-2003-Form-27-(22-03-2011).pdf

2040-delnp-2003-form-3.pdf

2040-delnp-2003-gpa.pdf

2040-delnp-2003-petition-137.pdf

2040-delnp-2003-petition-138.pdf


Patent Number 243238
Indian Patent Application Number 2040/DELNP/2003
PG Journal Number 41/2010
Publication Date 08-Oct-2010
Grant Date 30-Sep-2010
Date of Filing 28-Nov-2003
Name of Patentee HONDA GIKEN KOGYO KABUSHIKI KAISHA
Applicant Address 1-1, MINAMI-AOYAMA 2-CHOME, MINATO-KU, TOKYO 107-8556, JAPAN.
Inventors:
# Inventor's Name Inventor's Address
1 MASAAKI YAMAGUCHI C/O KABUSHIKI KAISHA HONDA GIJUTSU KENKYUSHO, 4-1, CHUO 1-CHOME, WAKO-SHI, SAITAMA 351-0113, JAPAN.
PCT International Classification Number B62K 21/12
PCT International Application Number PCT/JP01/05254
PCT International Filing date 2001-06-20
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 PCT/JP01/05254 2001-06-20 PCT