JP3851606B2 - Hydraulic master cylinder device for bar handle vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic master cylinder device for a bar handle vehicle that operates in a variety of bar handle vehicles such as motorcycles and generates a hydraulic pressure in a hydraulic master cylinder attached to the handle bar to operate a brake and a clutch. In particular, the operation lever combined with the hydraulic master cylinder is a two-piece type of lever body and knocker, and a hydraulic master cylinder for a bar handle vehicle having a grip adjustment mechanism between them. Relates to the device.
[0002]
[Prior art]
In the bar handle vehicle hydraulic master cylinder device, an operation lever attached to the cylinder body of the hydraulic master cylinder is provided with a lever main body disposed along the front side of the grip body, the lever main body, It is divided into a knocker disposed between the cylinder hole opening portion of the cylinder body, and a grip allowance adjusting mechanism is interposed between the knocker and the lever main body. An adjustment bolt screwed to the main body and a plate-like engagement portion provided on the knocker, the engagement portion being brought into contact with the outer surface of the head of the adjustment bolt, and the screwing amount of the adjustment bolt into the lever main body Is changed so that the grip margin between the grip and the lever main body can be adjusted (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-235992 (page 2-3, FIG. 1 and FIG. 2)
[0004]
[Problems to be solved by the invention]
However, since the lever body and the knocker described above rotate around separate spindles and the contact surface of the engaging portion is processed in a straight line, when the adjustment bolt is greatly retracted, The contact surface of the engaging portion is greatly inclined from the line orthogonal to the central axis of the adjustment bolt, so that the grounding property is deteriorated and the operation feeling is sometimes impaired. Also, a lock nut is required to maintain the screwed position of the adjusting bolt, and the lock nut has to be loosened or tightened each time the handle is adjusted.
[0005]
Accordingly, the present invention provides a hydraulic master for a bar handle vehicle that can satisfactorily maintain the contact relationship between the adjusting bolt and the engaging portion and solve the above problems even when the grip margin is greatly adjusted. The object is to provide a cylinder device.
[0006]
[Means for Solving the Problems]
In the present invention, a bottomed cylinder hole is formed in a cylinder body of a hydraulic master cylinder attached to a handlebar, a piston is inserted into the cylinder hole, and a space between the piston and the bottom wall of the cylinder hole is provided. A hydraulic chamber is defined in the cylinder body, and an operating lever attached to the cylinder body is pivotally supported by the cylinder body on the front side of the vehicle body of the grip provided at the end of the handlebar. A lever main body disposed along the cylinder body, and a pivot base supported on the cylinder body, and divided into a knocker disposed between the lever main body and the cylinder hole opening of the cylinder body, In the hydraulic master cylinder device for a bar handle vehicle in which a grip allowance adjusting mechanism for expanding / contracting a grip allowance between the lever main body and the grip is interposed between the knocker and the lever main body, the grip allowance adjusting mechanism In An adjustment bolt that is screwed into the lever main body and the knocker by adjusting the screwing amount, and a plate-like engagement protrusion formed on the other, and a plurality of adjustment bolts on the head outer surface of the adjustment bolt The engagement protrusions are formed in a circular arc shape, the engagement protrusions are detachably engaged with the engagement grooves, and the engagement grooves are The engagement protrusion is formed wider than the arc shape, and both side walls of the engagement groove are formed in an arc shape centered on two points that are spaced apart in the orthogonal direction across the central axis of the adjustment bolt. The bottom wall of the engaging groove between both side walls is formed in a straight line connected to both arc surfaces by a tangent line.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
A hydraulic master cylinder device 4 for a front brake in which a hydraulic master cylinder 2 and an operation lever 3 are combined is attached to a handle bar 1 that steers the front wheel at the front of the vehicle body of the bar handle vehicle.
[0008]
The hydraulic master cylinder 2 is a reservoir-integrated type having a reservoir 6 in the upper part of the cylinder body 5, and is located at a position inside the vehicle body relative to the accelerator grip 7 of the handlebar 1, separately from the vehicle body mounting arm 5 a integrated with the cylinder body 5. It is held by the bracket 8 and is bolted to be disposed along the vehicle body front portion of the handlebar 1. A pair of upper and lower lever brackets 5 b and 5 b are extended on the vehicle body front side of the cylinder body 5, and the operation lever 3 is pivotally supported by the lever brackets 5 b and 5 b using a knocker shaft 10. A bottomed cylinder hole 11 is formed in the cylinder body 5 so as to open the accelerator grip side, and a piston 12 is inserted into the cylinder hole 11 so as to be fluid-tight and movable.
[0009]
The operating lever 3 has a lever body 13 disposed in front of the vehicle body of the accelerator grip 7 and a working arm 14c in contact with the rear end of the piston 12 so that the opening between the cylinder hole 11 and the lever body 13 A grip allowance adjusting mechanism 9 is interposed between the working arm 14 c of the knocker 14 and the working arm facing portion 13 c of the lever body 13.
[0010]
The lever main body 13 is pivotally supported by the lever support arm 14b using the lever shaft 15 with the lever support arm 14b of the knocker 14 sandwiched between the upper and lower bifurcated rotation base 13a, and continues to the rotation base 13a. The grip operation portion 13b is disposed substantially along the front of the vehicle body of the accelerator grip 7, and has the above-described working arm facing portion 13c on the base handlebar side of the grip operation portion 13b. The pivot base 13a is formed in a bifurcated shape as described above, the grip operating portion 13b is formed in a rod-like body that gently curves in front of the accelerator grip 7, and the working arm facing portion 13c is a slightly thick plate. It is formed in the shape.
[0011]
The knocker 14 is pivotally supported by the knocker shaft 10 with the rotation base portion 14a sandwiched between the lever brackets 5b and 5b, and the lever support arm 14b and the action arm 14c are integrally connected to the rotation base portion 14a. The working arm 14c is disposed between the rear end of the piston 12 and the working arm facing portion 13c. Large and small arc-shaped engaging projections 14d and 14e are provided on the piston side and the working arm facing portion side of the working arm 14c, and the large-diameter arc-shaped engaging projection 14d is abutted against the rear end of the piston 12. The engagement protrusion 14e formed in a small arc shape with a radius R1 and a thickness T1 can be engaged with and disengaged from the two engagement grooves 17a and 17b of the adjustment bolt 16 screwed to the working arm facing portion 13c. Is attached to.
[0012]
The lever main body 13 and the knocker 14 are urged in the non-operating direction (counterclockwise in FIG. 2) by bringing the engaging protrusion 14d of the working arm 14c into contact with the rear end of the piston 12 located at the retreat limit. The stopper piece 14f protruding from the rotation base portion 14a of the knocker 14 is brought into contact with the stopper wall 5c between the lever brackets 5b and 5b to restrict the backward limit, and at the same time, between the accelerator grip 7 and the grip operating portion 13b. A predetermined hand allowance is set for.
[0013]
When the operating lever 3 is gripped by gripping the grip operating portion 13b, the lever main body 13 and the knocker 14 are rotated together with the knocker shaft 10 as a fulcrum, and the engaging projection 14d of the operating arm 14c is connected to the piston 12 To generate a hydraulic pressure at the bottom of the cylinder hole 11. The grip allowance between the accelerator grip 7 and the grip operation portion 13b can be adjusted within a range of two imaginary lines on the front side of the vehicle body and the accelerator grip side with the solid line in FIG. 2 being an intermediate position. .
[0014]
A return spring 18 is contracted between the lever base 13 and the pivot bases 13a and 14a of the knocker 14, and the lever main body 13 and the knocker 14 are urged in the opposite direction by the elastic force of the return spring 18, The lever main body 13 and the knocker 14 are prevented from rattling.
[0015]
The adjusting bolt 16 is formed by opening the working arm 14c side in the working arm facing portion 13c, so that the screw 16 is screwed into the screw hole 19 by adjusting the screwing amount, and an outer end of the shaft 16a. The grip head adjusting mechanism 9 is configured by the adjusting bolt 16 and the engaging protrusion 14e of the knocker 14 which are provided with a large-diameter head 16b provided continuously. The head 16b of the adjusting bolt 16 is formed in a petal shape with eight arcs continuously formed on the outer periphery, and the engagement grooves 17a and 17b are formed in a cross shape on the center axis CL of the adjusting bolt 16 on the outer surface thereof. It is provided crossing.
[0016]
Each of the engagement grooves 17a and 17b has a length L1 longer than the plate thickness T1 of the engagement protrusion 14e, both ends thereof are formed in an arc shape, and the engagement grooves 17a and 17b have a cross-sectional shape. The width W1 is formed wider than the small-diameter arc shape of the engaging protrusion 14e drawn with the radius R1. The side walls 17c and 17c of the engaging grooves 17a and 17b are formed in an arc shape using radii R2 and R2, and are straight lines that connect the bottom wall 17d between the side walls 17c and 17c to the arc surfaces of the side walls 17c and 17c. L2 is formed.
[0017]
The radii R2 and R2 used for the arcuate surfaces of the side walls 17c and 17c are centered on two points O1 and O1 that are spaced apart from each other in the orthogonal direction with the central axis CL of the adjusting bolt 16 in between. The distance L3 between them corresponds to the length of a straight line L2 that is tangent to the radii R2 and R2, and the width W1 that is the cross-sectional shape of the engagement grooves 17a and 17b is the straight line L2 between the radii R2 and R2. It has become a shallow thing by interposing.
[0018]
The adjustment bolt 16 formed as described above has one of the engagement grooves 17a and 17b, for example, the engagement groove 17a facing the vehicle body vertical direction in the same direction as the working arm 14c of the knocker 14, and the engagement groove 17a. The engaging protrusion 14e of the working arm 14c is engaged with the arm. In this engaged state, the center of the plate thickness of the working arm 14c coincides with the center axis CL of the adjustment bolt 16, so that the adjustment bolt 16 is prevented from rotating (FIG. 4).
[0019]
When the lever main body 13 is at an intermediate position in the grip margin adjustment range shown by the solid line in FIG. 2, the engagement protrusion 14 e of the operating arm 14 c is the bottom of the engagement groove 17 a on the center axis CL of the adjustment bolt 16. It is located at the center of the wall 17d (FIG. 1).
[0020]
When the lever body 13 is at the minimum grip allowance position indicated by the imaginary line on the accelerator grip side in FIG. 2, the engagement protrusion 14e of the operating arm 14c is formed in the engagement groove 17a positioned in the vertical direction of the vehicle body. When the lever body 13 is located on the accelerator grip side wall 17c (FIG. 5) and is located at the maximum grip allowance shown by the imaginary line on the front side of the vehicle body in FIG. 14e is located on the side wall 17c on the vehicle body front side of the engagement groove 17a located in the vertical direction of the vehicle body (FIG. 6).
[0021]
The present embodiment is configured as described above, and the grip margin between the accelerator grip 7 and the grip operation portion 13b is expanded or contracted by the amount of the adjustment bolt 16 screwed into the female screw hole 19, and the adjustment bolt 16 is tightened. When the screw body 19 is screwed into the lever body 13, the lever body 13 rotates to the accelerator grip side with the lever shaft 15 as a fulcrum to reduce the grip allowance. When the adjustment bolt 16 is extended from the female thread hole 19, the lever body 13 is moved. By turning the lever shaft 15 toward the front of the vehicle body with the fulcrum as a fulcrum, the grip margin is increased.
[0022]
Such a grip margin expansion / contraction adjustment is performed by rotating the adjustment bolt 16 while the engagement protrusion 14e is engaged with either of the engagement grooves 17a, 17b. In other words, the engagement protrusion 14e of the working arm 14c has a shallow engagement relationship with the shallow engagement grooves 17a and 17b formed by the radii R2 and R2 and the straight line L2. When the engagement groove 17a is turned from the vertical direction of the vehicle body to the lateral direction of the vehicle body, the engagement protrusion 14e is adjusted from the one side wall 17c of the engagement groove 17a. One end rides on the outer surface of the 16 heads 16b, and then falls into the engagement groove 17b that has been rotated in the vertical direction of the vehicle body to engage.
[0023]
As described above, in this embodiment, when adjusting the grip margin between the accelerator grip 7 and the grip operation portion 13b, the lever main body 14 has a lever shaft 15 different from the knocker 14 having the knocker shaft 10 as a fulcrum. Although it rotates to a fulcrum, the engaging grooves 17a and 17b on the lever body 13 side are constituted by arc-shaped side walls 17c and 17c and a straight bottom wall 17d, and the width W1 of the engaging grooves 17a and 17b is increased. Since the engaging projections 14e of the knocker 14 formed in an arc shape are detachably engaged with the engaging grooves 17a and 17b, the lever body 13 has a grip allowance indicated by two imaginary lines in FIG. Even if it moves to the maximum position or the minimum position, the engagement protrusion 14e of the working arm 14c engages with the arc-shaped side wall 17c set in the engagement grooves 17a and 17b. As a result, the engagement relationship between the engagement protrusion 14e and the engagement grooves 17a and 17b, that is, the grounding property, is improved, and a good operation feeling can be always obtained regardless of how the grip margin is adjusted. .
[0024]
Furthermore, since a lock nut is not required to fix the screwed position of the adjusting bolt 16, the adjustment work can be simplified and the cost can be reduced by reducing the number of parts. Moreover, the engagement grooves 17a and 17b are wide and shallow. Therefore, the grip allowance expansion / contraction adjustment can be performed while the engagement protrusion 14e of the knocker 14 is engaged with the engagement grooves 17a, 17b on the lever main body 13 side, and the expansion / contraction adjustment can be performed more easily.
[0025]
In the above-described embodiment, the adjustment bolt is provided with two engagement grooves in a cross shape that is a kind of radial shape, but the grip margin can be finely adjusted by providing three or more engagement grooves in a radial shape. Is possible. Further, the adjusting bolt and the engaging protrusion can be opposite to the above-described embodiment, that is, the adjusting bolt can be set to a knocker, and the engaging protrusion can be set to the lever body side.
[0026]
【The invention's effect】
As described above, according to the present invention, even when the grip margin between the grip and the lever body is adjusted, the grounding property between the engagement groove and the engagement protrusion of the adjustment bolt is maintained. The operation feeling of the operation lever can be kept good. Furthermore, since a lock nut is not required to fix the screwed position of the adjustment bolt, the adjustment work can be simplified and the cost can be reduced by reducing the number of parts. In addition, since the engagement groove is wide and shallow, the grip allowance can be adjusted while the engagement protrusion is engaged with the engagement groove of the adjustment bolt. Can be done.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional plan view of a main part of a grip allowance adjusting mechanism showing an embodiment of the present invention. FIG. 2 is a plan view of a state in which a hydraulic master cylinder device showing an embodiment of the present invention is attached to a handle bar. 3 is a cross-sectional plan view of the main part of a hydraulic master cylinder device showing an embodiment of the present invention. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1 showing an embodiment of the present invention. FIG. 6 is an enlarged cross-sectional plan view of a main part of a grip allowance adjusting mechanism showing an embodiment. FIG. 6 is an enlarged cross-sectional plan view of a main part of a grip allowance adjusting mechanism showing an embodiment of the present invention. Perspective view of adjustment bolt shown 【Explanation of symbols】
DESCRIPTION OF SYMBOLS 1 ... Handle bar, 2 ... Hydraulic master cylinder, 3 ... Control lever, 4 ... Hydraulic master cylinder device, 5 ... Cylinder body, 5b ... Lever bracket, 9 ... Hand grip adjustment mechanism, 10 ... Knocker shaft, 11 ... Cylinder Hole, 12 ... Piston, 13 ... Lever body, 13a ... Rotating base, 13b ... Grip operating part, 13c ... Working arm facing part, 14 ... Knocker, 14a ... Rotating base, 14b ... Lever supporting arm, 14c ... Working arm 14d, 14e ... arc-shaped engaging projections, 14f ... stopper piece, 15 ... lever shaft, 16 ... adjusting bolt, 16a ... shaft, 16b ... head, 17a, 17b ... engaging groove, 17c ... arc-shaped Side wall, 17d ... linear bottom wall, 18 ... return spring, 19 ... female screw hole, R1, R2 ... radius, O1 ... center of radius R2, T1 ... thickness of engaging protrusion 14e, L1 ... engagement Length of grooves 17a and 17b , The thickness of T1 ... engaging projection 14e, W1 ... engaging grooves 17a, 17b of the width, the central axis of the CL ... adjusting bolt 16, the straight line used for L2 ... bottom wall 17d

Claims (1)

A cylinder hole with a bottom is formed in a cylinder body of a hydraulic master cylinder attached to the handlebar, a piston is inserted into the cylinder hole, and a hydraulic chamber is formed between the piston and the bottom wall of the cylinder hole. The operation lever attached to the cylinder body is arranged along the front side of the vehicle body of the grip provided at the end of the handlebar with the rotation base portion pivoted to the cylinder body. The lever body is pivotally supported on the cylinder body, and is divided into a knocker disposed between the lever body and a cylinder hole opening of the cylinder body. The knocker and the lever In a hydraulic master cylinder device for a bar handle vehicle having a grip allowance adjusting mechanism for adjusting a grip allowance between the lever main body and the grip between the main body and the lever, the lever allowance adjusting mechanism includes the lever An adjustment bolt that is screwed to one of the main body and the knocker by adjusting the screwing amount, and a plate-like engagement protrusion formed on the other, and a plurality of engagements on the outer surface of the head of the adjustment bolt. The engaging grooves are radially recessed, the engaging protrusions are formed in a circular arc shape, the engaging protrusions are detachably engaged with the engaging grooves, and the engaging grooves are engaged with the engaging grooves. The protrusion is formed wider than the arc shape of the protrusion, and both side walls of the engagement groove are formed in an arc shape centered on two points that are spaced apart in the orthogonal direction across the central axis of the adjustment bolt. A hydraulic master cylinder device for a bar handle vehicle, wherein the bottom wall of the engaging groove between both side walls is formed in a straight line connected to both arc surfaces by a tangent line.

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