JP2008126989A - Hydraulic master cylinder device for bar handle vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic master cylinder device for a bar handle vehicle, inexpensively manufactured while maintaining accuracy by simplifying the shapes of a cylinder body and an operating lever to the utmost to reduce costs required for machining. <P>SOLUTION: A lever bracket 26 provided for a hydraulic master cylinder 21 is formed into a platelike shape integrally projecting from the cylinder body of the hydraulic master cylinder. The rotation base part 32 of the operating lever 31 is formed into a fork shape that is provided with a pair of rotary pieces 32a, 32b projecting at an interval where the lever bracket 26 can be inserted thereto and that is opened to the base end side of the operating lever 31. An acting arm 34 for operating a piston 27 of the hydraulic master cylinder 21 is projected from the branch portions of the rotary pieces 32a, 32b, and a switch operating piece 35 that restricts the rotation of the operating lever 31 and operates a brake lamp switch 22e is projected at the end of the rotary piece 32a arranged below a vehicle body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bar handle vehicle for operating a hydraulic master cylinder for operating a brake or a clutch by rotatably attaching an operation lever to a hydraulic master cylinder attached to a handle bar of a bar handle vehicle such as a motorcycle. The present invention relates to a hydraulic master cylinder device.

  Conventionally, in a hydraulic master cylinder device for a bar handle vehicle, a pair of upper and lower lever brackets project from a cylinder body of a hydraulic master cylinder attached to a handle bar, and a plate-like shape provided on an operation lever between the lever brackets. The rotation base is inserted, and the operation lever is rotatably attached to the hydraulic master cylinder by inserting the pivot into the lever bracket and the rotation base (see, for example, Patent Document 1).

  Further, in the two-piece type in which the operation lever is composed of a lever main body and a knocker, and a grip allowance adjusting mechanism is interposed between the knocker and the lever main body, the lever main body has a bifurcated rotation base. With the knocker inserted therein, it was pivotally attached to a pair of upper and lower lever brackets formed on the cylinder body of the hydraulic master cylinder using a pivot (for example, see Patent Document 2).

Furthermore, in a vertically mounted hydraulic master cylinder device in which the hydraulic master cylinder protrudes from the handlebar to the front of the vehicle body, one end of the connecting rod can be rotated by a lever bracket protruding from the cylinder body of the hydraulic master cylinder. There is one that is mounted and the other end of the connecting rod is inserted into a bifurcated rotation base formed on an operation lever to improve the start-up of the initial operation of the brake operation (for example, see Patent Document 3).
JP 2001-260975 A JP 2001-310787 A JP-A-10-250666

  For example, a relatively small two-wheeled vehicle equipped with an engine with a total displacement of 50 cc or less is desired to be inexpensive and easy to operate. In the hydraulic master cylinder device, the cost required for processing is reduced, What can be manufactured at low cost while maintaining accuracy is desired.

  However, in the above-mentioned Patent Document 1, a pair of upper and lower lever brackets must be formed on a cylinder body of a hydraulic master cylinder in which a cylinder hole, a reservoir tank, and a mounting boss portion for a vehicle body are integrally formed. The cost required for processing the hydraulic master cylinder is high.

  Moreover, in the thing of patent document 2, the rotation base part of an operation lever is formed in a bifurcated shape, and the bifurcated lever bracket protruding from the cylinder body is inserted into the rotation base part with a knocker or an adjusting mechanism inserted. Since it is attached, the structure becomes complicated and the cost increases, and it has not been applied to an inexpensive motorcycle.

  Further, in Patent Document 3, although the rising of the initial operation of the brake operation can be improved, a connecting rod is interposed between the pivot base of the operation lever formed in a bifurcated shape and the lever bracket of the cylinder body. Therefore, the structure is complicated, and it is not suitable for a hydraulic master cylinder device for a two-wheeled vehicle to be provided at low cost.

  Therefore, an object of the present invention is to provide a hydraulic master cylinder device for a bar handle vehicle that can be manufactured at low cost while maintaining the accuracy by reducing the cost required for processing by simplifying the shapes of the cylinder body and the operation lever. .

  In order to achieve the above object, the present invention provides a hydraulic master for a bar handle vehicle in which a pivot base of an operation lever is pivotally attached to a lever bracket of a hydraulic master cylinder mounted on a handle bar using a pivot. In the cylinder device, the lever bracket is formed in a plate shape that integrally protrudes from the cylinder body of the hydraulic master cylinder, and the operation lever has a bifurcated shape that opens the rotation base to the base end side of the operation lever. A working arm that has a pair of rotating pieces that are formed and projecting with an interval in which the lever bracket can be inserted, and that comes into contact with the piston of the hydraulic master cylinder from a branch portion where the rotating pieces branch Of the pair of rotating pieces, at the tip of the rotating piece disposed below the vehicle body with respect to the lever bracket, To restrict the rotation of the work lever, and may be allowed to protrude the switch actuating piece for actuating the operating lamp switch.

  According to the present invention, since the lever bracket that projects from the cylinder body of the hydraulic master cylinder that is integrally provided with a mounting hole for the cylinder hole, reservoir tank, and lever is formed in a plate shape, Compared with what is formed in this, processing becomes simple and the cost required for processing can be greatly reduced. On the other hand, the rotating base of the operating lever is formed in a bifurcated shape that opens to the base end side of the operating lever, so although the casting mold must be changed, it can be used as it is without being processed after casting. As a result, the manufacturing cost of the hydraulic master cylinder device can be reduced.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 is a front view of a hydraulic master cylinder device showing one embodiment of the present invention, FIG. 2 is a side view, FIG. 3 is a sectional view taken along line III-III in FIG. 2, and FIG. 4 is a sectional view taken along line IV-IV in FIG. is there. The hydraulic master cylinder device 10 of the present embodiment is a hydraulic master cylinder device for a front brake that is a combination of a hydraulic master cylinder 21 and an operating lever 31, and is a handle that steers front wheels at the front of a vehicle body of a bar handle vehicle. It is attached to the bar 11.

  The hydraulic master cylinder 21 is a reservoir-integrated type in which a reservoir 23 is integrally provided on an upper portion of a cylinder body 22, and a vehicle body mounting bracket 24 is integrally provided on the cylinder body 22. 25, the handlebar 11 inside the vehicle body is held with respect to the accelerator grip 12, and the vehicle body mounting bracket 24 and the holder 25 are fastened with bolts and supported on the vehicle body front side.

  A lever bracket 26 formed in a rectangular plate shape is integrally projected on the front side of the vehicle body of the cylinder body 22, and a pivot insertion hole 26 a for attaching the operation lever 31 is formed in the lever bracket 26. Has been.

  The cylinder body 22 is provided with a bottomed cylinder hole 22a that opens to the operation lever 31 side. The cylinder hole 22a and the reservoir 23 provided at the upper part of the cylinder body 22 include a relief port 23a, It communicates with the supply port 23b. A piston 27 is inserted into the cylinder hole 22a via cup seals 28a, 28a, and a hydraulic chamber 29 is defined between the piston 27 and the bottom wall of the cylinder hole 22a. A return spring 30 is contracted between the piston 27 and the bottom wall of the cylinder hole 22a. Due to the elastic force of the return spring 30, the piston 27 is urged toward the cylinder hole opening side.

  On the bottom wall of the cylinder body 22, a union boss portion 22 b is projected, and a union hole 22 c is provided in the union boss portion 22 b so as to communicate with the hydraulic pressure chamber 29. Further, a switch mounting portion 22d is formed on the lower side of the cylinder body 22 and a brake lamp switch 22e (the operation lamp switch of the present invention) is fixed to the switch mounting portion 22d. Further, a mirror mounting boss portion 22f for mounting a rearview mirror on the outside of the vehicle body of the reservoir 23 projects from the upper portion of the cylinder body 22.

  The operation lever 31 includes a rotation base portion 32, a grip portion 33, an action arm 34, and a switch operation piece 35. The pivot base 32 includes pivot pieces 32 a and 32 b that protrude vertically so as to allow insertion of the lever bracket 26, and is formed in a bifurcated shape that opens to the proximal end side of the operation lever 31. . The pivot pieces 32a and 32b are respectively provided with pivot mounting holes 36a and 36b facing each other, and a switch operating piece 35 is projected from the pivot piece 32a disposed below the vehicle body.

  The operating lever 31 has the lever bracket 26 inserted between the rotating pieces 32a and 32b, and the pivot 13 is formed in a pivot insertion hole 26a formed in the lever bracket 26 from a pivot mounting hole 36b formed in the upper rotating piece 32b. The nut 14 is inserted into a pivot mounting hole 36a formed in the lower rotating piece 32a, and the nut 14 is mounted on the tip of the pivot 13 protruding from the pivot mounting hole 36a. Is done. With this attachment, the grip portion 33 is disposed along the front of the accelerator grip 12 and the working arm 34 is disposed with the tip abutting against the outer end of the piston 27.

  The acting arm 34 that comes into contact with the piston 27 receives a pressing force from the piston 27 and rotates the operation lever 31 in the non-operation direction of the front portion of the vehicle body with the pivot 13 as a fulcrum. As a result, the switch operating piece 35 comes into contact with the vehicle body front wall of the cylinder body 22 and the rotation of the operation lever 31 is restricted, and the retreat limit of the piston 27 is restricted. A predetermined grip is set. Further, the switch operating piece 35 pushes the actuator of the brake lamp switch 22e into the casing, and turns off the brake lamp switch 22e.

  The hydraulic master cylinder 21 configured as described above includes a cylinder body 22 having a cylinder hole 22a, a reservoir 23, a lever bracket 26, a switch mounting portion 22d, a union boss portion 22b, and a vehicle body mounting bracket. 24 and the mirror mounting boss portion 22f are formed by performing predetermined processing on the original mold integrally formed by casting, and then the piston 27 is inserted into the cylinder hole 22a or the operation lever 31 is mounted on the lever bracket 26. For example, it is formed by mounting various parts. In each machining part of the cylinder body 22, the relief port 23a, the supply port 23b, a female screw hole 22g for screwing a male screw (not shown) of the rearview mirror base to the mirror mounting boss 22f, and a lever bracket 26 are provided. The formed pivot insertion hole 26a and the inner surface of the reservoir 23 are processed from the upper side of the cylinder body 22, such as drilling, inner diameter processing, screw processing, and finishing processing. On the other hand, the union hole 22c and the female screw hole 22i into which the switch fixing screw 22h of the switch mounting portion 22d is screwed further open a level window 23c formed on the side wall of the reservoir 23 from the lower side of the cylinder body 22. The opening 23d for formation and the inner peripheral surface of the vehicle body mounting bracket 24 are each processed from the same direction as the direction in which the cylinder hole 22a is processed.

  In this way, the hydraulic master cylinder 21 is integrally provided with the lever bracket 26 formed in the shape of a rectangular plate on the vehicle body front side of the cylinder body 22, and the pivot insertion hole 26 a is provided as a relief port 23 a and a supply port 23 b. Since the processing is performed from the upper side of the cylinder body 22 together with the inner surface processing of the reservoir 23, casting and cutting can be easily performed, and the cost required for processing can be greatly reduced. In particular, in this embodiment, each processing part of the cylinder body 22 is arranged so that it can be processed from any one of the three directions of the upper side, the lower side, and one side of the cylinder body 22, so that the prototype at the time of processing is By holding in a direction where machining is not performed, it is not necessary to change the holding position of the original even when machining is performed from any one of the upper side, the lower side, and one side. Thereby, the time required for setup and processing can be shortened.

  In addition, the operation lever 31 is also formed by casting a rotation base 32, a grip 33, a working arm 34, a switch operating piece 35, and pivot mounting holes 36a and 36b. The operation lever 31 is formed in a bifurcated shape in which the rotation base portion 32 opens to one end side of the operation lever 31, so that the conventional casting mold must be changed, but is used as it is after casting. Therefore, an increase in manufacturing cost can be kept low.

  Thus, the manufacturing cost of the hydraulic master cylinder device 10 can be greatly reduced since the manufacturing cost of the hydraulic master cylinder 21 can be greatly reduced even if the manufacturing cost of the operation lever 31 is slightly increased. Can be reduced.

  Note that the hydraulic master cylinder of the present embodiment is configured such that processing on the original mold after casting can be performed from three directions of the upper side, the lower side, and one side, but the hydraulic master of the present invention. The cylinder is not limited to this, and the lever bracket may be formed in a plate shape protruding integrally from the cylinder body of the hydraulic master cylinder.

It is a front view of a hydraulic master cylinder device showing an example of the present invention. It is a side view of a hydraulic master cylinder device similarly. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is IV-IV sectional drawing of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Hydraulic master cylinder apparatus, 11 ... Handlebar, 12 ... Accelerator grip, 13 ... Pivot, 14 ... Nut, 21 ... Hydraulic master cylinder, 22 ... Cylinder body, 22a ... Cylinder hole, 22b ... Union boss part, 22c ... Union hole, 22d ... Switch mounting part, 22e ... Brake lamp switch, 22f ... Mirror mounting boss part, 22g, 22i ... Female screw hole, 22h ... Switch fixing screw, 23 ... Reservoir, 23a ... Relief port, 23b ... Supply port , 23c ... level window, 23d ... opening, 24 ... body mounting bracket, 25 ... holder, 26 ... lever bracket, 26a ... pivot insertion hole, 27 ... piston, 28a ... cup seal, 29 ... hydraulic chamber, 30 ... return spring , 31 ... operating lever, 32 ... rotating base, 32a, 32b ... rotating piece, 33 Grip portion, 34 ... functional arm, 35 ... switch actuating piece, 36a, 36b ... pivot mounting hole

Claims (2)

In a hydraulic master cylinder device for a bar handle vehicle in which a pivot base of an operation lever is pivotally attached to a lever bracket of a hydraulic master cylinder mounted on a handle bar using a pivot, the lever bracket includes the liquid bracket It is formed in a plate shape that integrally projects from the cylinder body of the pressure master cylinder, and the operation lever is formed in a bifurcated shape that opens to the base end side of the operation lever so that the lever bracket can be inserted. A bar having a pair of rotating pieces projecting with a gap and a working arm contacting the piston of the hydraulic master cylinder projecting from a branch portion where the rotating pieces branch Hydraulic master cylinder device for steering vehicle. Of the pair of rotating pieces, a switch operating piece that restricts the rotation of the operation lever and operates the operation lamp switch at the tip of the rotating piece disposed below the vehicle body with respect to the lever bracket. The bar handle vehicle hydraulic master cylinder device according to claim 1, wherein:

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