JP2002211473A - Hydraulic master cylinder device for bar handle vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To favorably maintain operation feeling set for an operation lever corresponding to a bar handle vehicle even when the grip position at the operation lever combined with a hydraulic master cylinder in the bar handle vehicle is varied from time to time. SOLUTION: A rotary arm 32 and a grip operation part 35 are connected to each other by a bolt 33 and a nut 34 to be integrated for composing the operation lever 4. A pivot 30 is disposed to be roughly parallel to a handle bar 2, and a base end 32a of the rotary arm 32 is pivotally supported by the pivot 30. A base end 35a of the grip operation part 35 is fixed to holders 32b and 32b of the rotary arm 32, and the grip operation part 35 is disposed along the car body front part side of an accelerator grip 10. The operation lever 4 is rotated around the pivot 30 as a support point.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bar handle vehicle such as a motorcycle, a three-wheeled motor vehicle having a steering handle bar at the front of a vehicle body, a three- or four-wheeled buggy vehicle, a snowmobile, and the like. The present invention relates to a hydraulic master cylinder device for a bar handle vehicle that hydraulically operates a brake or a clutch by combining a hydraulic cylinder and an operation lever.

[0002]

2. Description of the Related Art In a bar-handle vehicle such as a motorcycle, a hydraulic master cylinder device for hydraulically operating a brake is disclosed, for example, in Japanese Utility Model Publication No. 4-34157. In this technology, a vertical hydraulic master cylinder is mounted on the front side of a vehicle body of a handlebar in a direction orthogonal to the handlebar, and a brake lever is pivotally attached to a lever bracket of the hydraulic master cylinder using a pivot. A push rod is interposed between the base end of the lever and the piston inserted into the cylinder hole of the hydraulic master cylinder, and the grip lever operation part that extends along the front of the handlebar end grip is provided. By grasping and operating, the push rod pushes the piston toward the bottom of the cylinder hole, and the hydraulic fluid pressurized in the hydraulic chamber at the bottom of the cylinder hole is supplied to the brake and the clutch.

[0003] Such a brake lever also has a push rod from the center axis (fulcrum) of the pivot to the length L1 from the central axis (fulcrum) of the pivot to the grip point (force point) of the grip operating portion. , The ratio of the length L2 to the pressing point (action point), that is, L1: L2 = lever ratio, is set in the vehicle width direction. With this lever ratio, the operation feeling such as light weight when the brake lever is gripped is operated. It is determined.

[0004]

In such a configuration, even if the same driver, the position of gripping the lever changes depending on the time, or the grip of the lever may vary depending on the size and preference of the driver's hand. Since the positions are different, the lever is shifted from the reference gripping point (force point) of the gripping operation unit in the vehicle width direction, and the lever ratio preset for the brake lever is changed. Such a shift in the gripping position of the lever directly leads to a change in the lever ratio, and the operation feeling set for the bar-handled vehicle cannot be fully utilized.

The present invention has been made in view of such a situation, and an object of the present invention is to operate an operating lever in accordance with a bar handle vehicle even if the gripping position of an operating lever may vary from time to time. It is an object of the present invention to provide a hydraulic master cylinder device for a bar handle vehicle, which can maintain an operation feeling set on a lever in a favorable state.

[0006]

According to the above-mentioned object, according to the present invention, there is provided a hydraulic master cylinder disposed on a front side of a vehicle body of a handlebar, and the hydraulic master cylinder is operated by using a pivot on a lever bracket. In a hydraulic master cylinder device for a bar handle vehicle, a lever is rotatably mounted on a shaft and a piston inserted into a cylinder hole of the hydraulic master cylinder is pushed by a gripping operation of the operating lever. A rotating arm that is disposed substantially parallel to the handlebar, has a base end pivotally connected to the pivot on the operation lever, and rotates in a direction orthogonal to a center axis of the pivot; and a tip of the rotating arm. And a grip operating portion disposed along the front side of the vehicle body of the grip provided at the end of the handlebar.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a front brake of a bar handle vehicle will be described below with reference to the drawings. The hydraulic master cylinder device 1 includes a hydraulic master cylinder 3 attached to a handlebar 2 for steering a front wheel (not shown) at the front of the vehicle body, a brake lever 4 attached to the hydraulic master cylinder 3, And a push rod 5 interposed therebetween.

The hydraulic master cylinder 3 has a cylinder body 7 having a bottomed cylinder hole 7 formed in a direction perpendicular to the center axis of the handlebar 2, and a piston 8 inserted into the cylinder hole 7 to be vertically installed. Mold master cylinder, cylinder body 6
A half of the bracket 6a and the other half of the bracket 9 hold the vicinity of the accelerator grip 10 at the end of the handlebar 2 and fasten these with bolts 11, 11 to secure the handlebar 2 in front of the vehicle body. It is attached to the part side.

The piston 8 is liquid-tightly and movably inserted using a primary cup 12a and a secondary cup 12b into a cylinder hole 7 opening toward the front of the vehicle body. A hydraulic pressure chamber 13 is defined between them. A return spring 14 is contracted between the bottom wall of the cylinder hole 7 and the piston 8, and the piston 8
Is always urged in the direction of the opening of the cylinder hole 7 by the resilient force of the return spring 14, and the retraction limit when the cylinder is inactive is limited by the plug 15 engaged with the large-diameter opening 7 a of the cylinder hole 7. Regulated by contact.

An output port 20, a relief port 21, and a supply port 22 are provided on the upper wall of the cylinder body 6 so as to communicate with the cylinder hole 7, and the upper openings of both ports 21, 22 are fixed to the plate 23. Connection pipe 24 is covered. A hose 25 connected to a separately provided reservoir (not shown) is connected to the connection pipe 24 so that the hydraulic fluid flows between the cylinder hole 7 and the reservoir. The output port 20 is connected to a front wheel brake (both not shown) via a brake hose so that the hydraulic fluid pressurized in the hydraulic chamber 13 at the bottom of the cylinder hole 7 is supplied to the front wheel brake so as to be hydraulically operated. Has become.

At the front end of the cylinder body 6, a pair of left and right lever brackets 6b, 6b is protrudingly provided with a predetermined gap, and the brake lever 4 is provided with a pivot 30 and a nut 31 on the lever brackets 6b, 6b. And a gripping operation unit 3 fixed to the tip of the rotating arm 32 with a bolt 33 and a nut 34
It consists of five.

The pivot arm 32 has its base end 32a inserted between the lever brackets 6b, 6b, and the above-mentioned pivot 30 is inserted through them through the bush 36 in parallel with the handlebar 2, and a nut 31 is attached to the distal end thereof. By screwing,
The cylinder body 6 is mounted on the front side of the vehicle body in the vehicle body vertical direction orthogonal to the center axis O1 of the pivot 30. When the cylinder body 6 is not in operation, the cylinder body 6 is tilted obliquely upward and forward of the vehicle body.

The tip of the rotating arm 32 is a pair of holders 32b, 32b parallel to the central axis O1 of the pivot 30, and the base end 35a of the gripping operation section 35 is inserted between the holders 32b, 32b. By inserting the above-mentioned bolt 33 into these and screwing a nut 34 to the tip thereof, the grip operation part 35 is fixed perpendicularly to the rotating arm 32, and the rotation arm 32 and the grip operation part 35 The brake lever 4 is configured. The grip operation unit 35 attached in this manner is
The accelerator grip 10 is provided with a gentle curve along the front side of the vehicle body, and a predetermined grip margin is set between the grip operation unit 35 and the accelerator grip 10.

A boss hole 32c parallel to the center axis O1 of the pivot 30 and an insertion hole 32d orthogonal to the center axis O1 of the pivot 30 are formed in the intermediate portion of the rotating arm 32 so as to penetrate in the intersecting direction. Boss hole 3 slightly larger than insertion hole 32d
A cylindrical female thread piece 37 is rotatably mounted on 2c.
The shaft 5a of the push rod 5 described above is inserted through the insertion hole 32d. In the push rod 5, a male screw 5b formed on the shaft portion 5a is screwed into a female screw 37a of a female screw piece 37, and a spherical head 5c at the tip is formed by the rear end of the piston 8 and the inner surface of the plug 15. It is attached so as not to come off with the engagement hole 38 provided.

The inoperative position of the turning arm 32 of the push rod 5 attached as described above is determined by the degree of screwing with the female screw piece 37, and the push rod 5 is gripped through the inoperative position of the turning arm 32. The grip margin between the operation unit 35 and the accelerator grip 10 is determined. Thereby, the shaft 5
a When the operation dial 5d at the outer end is turned to one or the other, the screwing condition with the female screw piece 37 is changed and the turning arm 3 is turned.
2 rotates about the central axis O1 of the pivot 30 as a fulcrum. As a result, the retreat limit position of the rotating arm 32 is changed, and at the same time, the grip operation unit 35 is also integrally rotated, and the above-mentioned grip margin is changed.

The grip operating portion 35 of the brake lever 4 includes:
As shown in FIG. 1, a reference grip point (power point) P1 set by the vehicle maker is on the front side surface 35b of the vehicle body, and the brake lever 4 is provided with a reference grip point (power point) from the central axis O1 (fulcrum) of the pivot 30. The ratio of the length L1 to P1 and the length L2 from the center axis O1 (fulcrum) of the pivot 30 to the center axis O2 of the female threaded piece 37, which is the point of pressing (the point of action) on the push rod 5; L1: L2 = Lever ratio is set in the vertical direction of the vehicle body.

This lever ratio is determined by the driver's gripping operation part 35 of the brake lever 4, the gripping position of the same driver varies from time to time, and the driver's individual hand size and preference. The gripping position of the lever may be different. From the reference gripping point (force point) P1 set on the front side surface 35b of the vehicle body of the gripping operation unit 35, for example, P2 or P3 in the vehicle width direction (left-right direction in FIG. 2). It will shift to the grip point. For this reason, in the conventional case where the lever ratio is taken in the width direction of the vehicle body, the deviation of the lever grip position from the reference grip point (point of force) P1, that is, the length of the reference grip points P1-P2 and P1-P3 is Length L of pivot 30 from center axis O1 (fulcrum)
Acts directly on 1 as it is.

On the other hand, in the present embodiment in which the lever ratio is set in the up-down direction of the vehicle body, when the grip point is shifted to P2 or P3, the pivot 30 is bent due to the gentle curvature of the front side surface 35b of the vehicle body. A reference radius R1 (= length L1) up to a reference grip point (force point) P1 with the central axis O1 as a fulcrum, a radius R2 from the central axis O1 to the point P2, and a radius from the central axis O1 to the point P3. The influence on the length L1 with respect to the center axis O1 (fulcrum) is suppressed to a very small length such as the radius R2-radius R1 = L3 or the radius R3-radius R1 = L4 (see FIG. 3).

The hydraulic master cylinder device 1 of this embodiment is
It is configured as described above, and is in the state shown in FIGS. 1 and 2 when the brake lever 4 is not depressed and not operated. In addition, the brake lever 4
When the gripping operation unit 35 is operated, the rotating arm 32, the gripping operation unit 35, and the push rod 5 are integrally rotated in the direction of the handlebar 2 with the central axis O1 of the pivot 30 as a fulcrum. The spherical head 5c at the tip of the push rod 5 pushes the piston 8 toward the bottom of the cylinder hole 7. Then, after the primary cup 12a on the piston tip side closes the relief port 21 to cut off the communication between the cylinder hole 7 and the reservoir, the hydraulic pressure chamber 1
The working fluid in 3 is gradually pressurized, and the working fluid of a predetermined pressure is supplied to the front wheel brake to perform the braking of the front wheels.

Further, when the driver grips the grip operating portion 35 of the brake lever 4, the gripping position of the same driver changes from time to time, or the driver grips the lever depending on the size of his / her hand or his / her preference. The position is different, and the grip point (power point) at that time is shifted from the set reference grip point P1 in the vehicle body width direction (the left-right direction in FIG. 2). In the present embodiment, as described above, the center axis O1 is set. Since the influence on the length L1 with respect to the (fulcrum) is suppressed to a slight length due to the gentle curvature of the front side surface 35b of the vehicle body, the displacement in the vehicle body width direction directly affects the conventional structure. As compared with the brake lever, the influence on the lever ratio is suppressed as small as possible, and the operation feeling of the brake lever 4 set according to the bar handle vehicle such as light weight when the grip operation part 35 is gripped is improved. It is possible to maintain.

Further, in the brake lever 4 of the present embodiment, in which the rotating arm 32 and the grip operating section 35 are connected by bolts 33 and nuts 34, the angle between the rotating arm 32 and the grip operating section 35 can be set freely. It is possible to use the accelerator grip 10
Not only can the mounting angle of the grip operation unit 35 be adjusted according to the physique and preference of the driver, but also it can be used in accordance with the handlebar shape of various vehicles, so that versatility is extremely high.

As is apparent from the above-described embodiment, according to the characteristics of the present invention, the front side of the vehicle body of the grip operating portion where the grip point (power point) is set is parallel to the grip at the end of the handlebar. Therefore, even if the grip point is shifted in the width direction of the vehicle body, it is best because the lever ratio is not affected at all, but the grip operation portion of the operation lever is gently as illustrated in the embodiment. It is general to make it easy to grasp by bending, and the present invention can minimize the influence on the lever ratio even in such a case.

In the above embodiment, the push rod is interposed between the piston of the hydraulic master cylinder and the turning arm of the brake lever. However, in the present invention, the turning arm is provided with the piston pressing portion integrally. A push rod may be omitted. Further, as the operation lever, the rotating arm and the grip operation unit may be integrally formed.

[0024]

As described above, according to the hydraulic master cylinder device for a bar handle vehicle of the present invention, the driver of the bar handle vehicle can be moved at a position shifted from a reference grip point set on the operation lever. Even if the grip operation part is gripped, the effect on the lever ratio is minimized, so the operation feeling of the operation lever set according to the bar handle vehicle, such as the lightness when gripping the grip operation part, is reduced. It can be maintained well.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along the line II of FIG. 2 showing one embodiment of the present invention.

FIG. 2 is a partially cutaway plan view of a hydraulic master cylinder device showing one embodiment of the present invention.

FIG. 3 is a view for explaining a lever ratio of a brake lever showing one embodiment of the present invention.

[Explanation of symbols]

1: hydraulic master cylinder device, 2: handlebar, 3:
Hydraulic master cylinder, 4 ... brake lever (operating lever of the present invention), 5 ... push rod, 6 ... cylinder body, 6b ... lever bracket, 7 ... cylinder hole, 8 ... piston, 10 ... accelerator grip, 30 ... pivot, 3
2: rotating arm, 35: grip operation part, 35b: front side of vehicle body of screw operation part 35, 37: female screw piece, P1: reference grip point (force point), P2, P3: grip position shifted Virtual gripping point in case, O1... Central axis of pivot 30 (rotation fulcrum of brake lever 4), O2... Central axis of female screw piece 37 (pressing point "operating point" on push rod 5), L1. Length from O1 to reference grip point P1, L2 ... Length from center axis O1 to center axis O2 of female screw piece 37, L3
... the length of radius R2-radius R1, L4 ... radius R3-radius R
1 length, R1 ... the reference radius from the central axis O1 to the reference grip point P1, R2 ... the radius from the central axis O1 to the virtual grip point P2, R3 ... the radius from the central axis O1 to the virtual grip point P3 ,

Claims (1)

[Claims] 1. A hydraulic master cylinder is disposed on the front side of a vehicle body of a handlebar, and an operation lever is pivotally mounted on a lever bracket of the hydraulic master cylinder using a pivot so as to be rotatable. In a hydraulic master cylinder device for a bar handle vehicle, which pushes a piston inserted into a cylinder hole of the hydraulic master cylinder by a gripping operation, the pivot is disposed substantially parallel to the handle bar, and the operating lever is provided. A pivot arm pivotally mounted at a base end to the pivot to rotate in a direction orthogonal to a central axis of the pivot; and And a grip operating portion disposed along the front side of the vehicle body of the grip.