JP2005138769A - Mounting structure of hydraulic master cylinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To minimize transmission of vibrations generated on the body side such as vibrations generated in an engine, and running vibrations, to a hydraulic master cylinder. <P>SOLUTION: A bolt inserting hole 4 is bored in a car body mounting bracket 2a protrudingly installed on a cylinder body 2, and is furnished with a force receiving surface 4b abutting on a mounting bolt 7 when the hydraulic master cylinder 1 is actuated. A resilient member 6 with a C-shaped cross section covering the inside surface of the hole 4 excluding the force receiving surface 4b is installed in the hole 4, and the car body mounting bracket 2a is fastened by a bolt to a car body frame 9 through the resilient member 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a structure for mounting a hydraulic master cylinder used for a vehicle brake or clutch to a vehicle body frame, and more specifically, transmits vibrations generated on the vehicle body side such as engine vibration and running vibration to the hydraulic master cylinder as much as possible. The present invention relates to a hydraulic master cylinder mounting structure that is not provided.

A hydraulic master cylinder is used to convert an input to an operation element provided in a vehicle into a fluid pressure and use the fluid pressure for a brake or a clutch operation. In this hydraulic master cylinder, a bolt insertion hole is formed in a vehicle body mounting bracket projecting from the cylinder body, and the vehicle body mounting bracket and the vehicle body frame are bolted by a mounting bolt inserted into the bolt insertion hole. (For example, refer to Patent Document 1).
Japanese Utility Model Publication No. 4-23722

  However, in the hydraulic master cylinder described above, vibrations generated on the vehicle body side, such as vibrations generated by the engine and traveling vibrations, are easily transmitted to the cylinder body, and in particular, as in the hydraulic master cylinder for rear wheels of motorcycles and tricycles. In the case where the engine is disposed near the body frame to which the hydraulic master cylinder is attached, the vibration of the engine is easily transmitted to the cylinder body from the body frame or the mounting bolt.

  Therefore, the present invention has an object to provide a hydraulic master cylinder mounting structure in which vibration generated on the vehicle body side, such as vibration generated in an engine or traveling vibration, is not transmitted to the cylinder body of the hydraulic master cylinder as much as possible. It is said.

  In order to achieve the above object, the present invention provides a vehicle body mounting bracket projecting from a cylinder body of a hydraulic master cylinder, and a bolt insertion hole is formed, and the cylinder body is mounted on the vehicle body by a mounting bolt inserted through the bolt insertion hole. In the mounting structure of the hydraulic master cylinder bolted to the frame, the bolt insertion hole is provided with a force receiving surface that comes into contact with the mounting bolt side when the hydraulic master cylinder is operated, and the bolt insertion hole excluding the force receiving surface An elastic member is attached to the inner peripheral surface of the vehicle body, and the vehicle body mounting bracket is bolted to the vehicle body frame via the elastic member, and the force receiving surface protrudes to the inner peripheral side of the bolt insertion hole. May be formed.

  Further, the hydraulic master cylinder has a vertically long cylinder hole in a cylinder body, and a vertically placed type in which a piston that is operated by pushing a push rod connected to an operation element is inserted in the cylinder hole. Two vehicle body mounting brackets are arranged side by side in the cylinder axial direction, the force receiving surface is formed on the push rod side of the bolt insertion hole, and a reservoir for storing hydraulic fluid in the cylinder body The tank may be integrally formed.

  Further, the length of the elastic member in the axial direction may be longer than the length of the bolt insertion hole in the axial direction, and one end surface of the elastic member may be in contact with the body frame, and the mounting bolt may be a collar. The force receiving surface and the mounting bolt may be in contact with each other via the collar.

  According to the present invention, the portions other than the force receiving surface of the bolt insertion hole contact the bolt insertion hole and the mounting bolt via the elastic member, so that vibration generated on the vehicle body side, such as vibration generated by the engine and traveling vibration, is generated. It is possible to prevent transmission to the cylinder body of the hydraulic master cylinder as much as possible. In addition, when the hydraulic master cylinder is operated, the force receiving surface is in direct contact with the mounting bolt side to receive the force, so that the operation feeling is not lowered.

  Further, by inserting the mounting bolt into the elastic member through the collar, the threaded portion of the mounting bolt does not contact the elastic member, so that the mounting performance of the mounting bolt is improved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The hydraulic master cylinder 1 of the present embodiment outputs, for example, a brake hydraulic pressure for braking the rear wheel of a motorcycle, and has a vertically long and substantially cylindrical shape on the upper part of a vertically long and substantially cylindrical cylinder body 2. The reservoir tank 3 is integrally formed.

  Two vehicle body mounting brackets 2a and 2a project from one side of the cylinder body 2 in the upper and lower directions in the cylinder axial direction, and a collar 5 and an elastic member 6 are inserted into a bolt insertion hole 4 formed in each vehicle body mounting bracket 2a. The mounting bolt 7 is inserted through the cylinder body 2, and the cylinder body 2 is bolted to the vehicle body frame 9 using the mounting bolt 7 and the nut 8.

  The diameter of the bolt insertion hole 4 is formed larger than the outer diameter of the collar 5, and a protrusion 4 a that protrudes to the inner peripheral side is provided below. The upper surface of the protrusion 4a is curved along the outer diameter of the collar 5, and this upper surface becomes a force receiving surface 4b that contacts the mounting bolt 7 via the collar 5 during braking. An elastic member 6 is attached to a portion of the bolt insertion hole 4 excluding the protrusion 4a.

  The collar 5 is a metal cylinder having an inner diameter substantially the same as the outer diameter of the mounting bolt 7 and an outer diameter smaller than the diameter of the bolt insertion hole 4, and the axial length is the axis of the bolt insertion hole 4. It is formed longer than the length in the direction, and is provided with a flange 5a at one end.

  The elastic member 6 is formed of an elastic material such as synthetic rubber, and has an outer diameter that is approximately the same as the diameter of the bolt insertion hole 4 and an inner diameter that is approximately the same as the outer diameter of the collar 5. It is formed in a C-shaped cross section provided with a notch 6a into which the protrusion 4a is inserted. Further, the length of the elastic member 6 in the axial direction is longer than the length of the bolt insertion hole 4 in the axial direction, and is formed to have the same dimension as the length of the collar 5 in the axial direction.

  The cylinder body 2 is provided with a vertically long bottomed cylinder hole 10 having an open lower end, and a piston 11 is inserted into the cylinder hole 10 in a liquid-tight and movable manner using cup seals 12 and 13. The piston 11 has a lower end supported at the tip of a push rod 15 pivotally supported by the brake pedal 14, and a hydraulic chamber 16 is defined between the piston 11 and the upper wall of the cylinder hole 10. A return spring 17 is contracted between the piston 11 and the upper wall, and the piston 11 is urged downward in the vehicle body, which is a non-operating direction, by the elastic force of the return spring 17, and its retreat limit is reached. However, it is regulated by contact with the head 15 a of the push rod 15 that is locked to the circlip 18 that is engaged with the opening of the cylinder hole 10. A union hole 19 communicates with the upper portion of the hydraulic chamber 16, and a banjo 20 a at the end of the brake hose 20 is connected to the union hole 19 using a union bolt 21.

  The reservoir tank 3 has a liquid storage chamber 3a that is integral with the cylinder body, and a lid member 3b that is attached to the upper opening of the liquid storage chamber 3a, and a diaphragm 22 is sandwiched therebetween. The liquid storage chamber 3a is formed in a vertically long cylindrical shape, and the liquid storage chamber 3a and the cylinder hole 10 are communicated with each other through a liquid passage hole 23 formed in the bottom wall of the liquid storage chamber 3a, a relief port 24, and a supply port 25. The hydraulic fluid can flow between the liquid storage chamber 3 a and the cylinder hole 10.

  When the hydraulic master cylinder 1 formed in this way is attached to the vehicle body frame 9, the collar 5 is inserted into the inner peripheral side of the elastic member 6 and the elastic member 6 to which the collar 5 is attached is attached to the vehicle body mounting bracket 2a. From the side surface facing the vehicle body frame 9, the positions of the notch portion 6 a and the projection 4 a are aligned and inserted into the bolt insertion hole 4. The flange 5a of the collar 5 protruding from the bolt insertion hole 4 is brought into contact with the vehicle body frame 9, the positions of the insertion hole 9a formed in the vehicle body frame 9 and the insertion hole 5b of the collar 5 are aligned and attached from the vehicle body frame 9 side. The bolts 7 are inserted, nuts 8 are screwed onto the male screws 7 a of the mounting bolts 7 protruding from the tips of the collar 5 and the elastic member 6, and the vehicle body mounting brackets 2 a are attached to the vehicle body frame 9.

  The hydraulic master cylinder 1 described above is mounted on a motorcycle 26 as shown in FIG. 4, for example. In the motorcycle 26, a swing arm 27 is supported at the rear portion of the body frame 9 so as to be swingable in the vertical direction, and a rear wheel 28 is suspended from the rear end of the swing arm 27 using a rear axle 29. A hydraulic rear wheel brake 30 is disposed between the rear wheel 28 and one arm 27 a of the swing arm 27. The rear wheel brake 30 includes a disc rotor 31 that rotates integrally at one side of the rear wheel 28, a caliper bracket 32 that is supported at the base end by the rear axle 29, and a caliper body that is supported at the distal end of the caliper bracket 32. 33. The hydraulic master cylinder 1 is fixed to the rear part of the vehicle body frame 9 with the cylinder body 2 facing upward and downward, and the rear end of the brake pedal 14 is rotated around the push rod 15 protruding from the lower end of the cylinder body 2. The cylinder body 2 and the caliper body 33 are connected by a brake hose 20 so as to be movable. An engine 34 is disposed near the brake pedal 14 at the front of the vehicle body frame 9.

  In the hydraulic master cylinder 1, the push rod 15 is moved upward by depressing the brake pedal 14 to move the piston 11 upward, and the hydraulic fluid generated in the hydraulic chamber 16 is supplied from the union hole 19 to the rear wheel brake 30. Is done. During this operation, the hydraulic master cylinder 1 is applied with force toward the upper side of the vehicle body, but the force receiving surfaces 4b and 4b disposed on the push rod 15 side of the bolt insertion holes 4 and 4 and the mounting bolts 7 and 7 are applied. Can contact with each other via the collar 5 and can effectively receive this force, so that the force transmitted to the hydraulic master cylinder 1 during operation does not escape upward, and the operation feeling does not deteriorate.

  The inner peripheral surface of the bolt insertion hole 4 excluding the force receiving surfaces 4b and 4b is in contact with the mounting bolt 7 via the collar 5 and the elastic member 6, and further, the vehicle body frame 9 and the vehicle body mounting brackets 2a and 2a. Since the end surface of the elastic member 6 is in contact with the flange 5a of the collar 5 between the engine 5 and the vehicle body, vibrations from the engine 34 provided near the vehicle body frame 9 and traveling vibrations are generated on the other vehicle body side. The vibration to be transmitted can be prevented from being transmitted to the cylinder body 2 of the hydraulic master cylinder 1 as much as possible. For this reason, since the hydraulic fluid does not foam due to vibration, a stable braking force can always be ensured. The elastic member 6 is positioned with the notch 6 a and the protrusion 4 a in contact with each other, and is securely attached to the inner periphery of the bolt insertion hole 4.

  The present invention is not limited to being applied to a hydraulic master cylinder for rear wheel brakes of motorcycles and tricycles as in the above-described embodiments, but is also applied to a hydraulic master cylinder for front wheel brakes and a clutch mounting structure. Furthermore, it can be applied to a hydraulic master cylinder for a four-wheeled vehicle. Further, as in the above-described embodiment, the invention can be applied not only to a hydraulic master cylinder having a reservoir tank integrally with a cylinder body, but also to a hydraulic master cylinder having a reservoir tank separate from the cylinder body. Two or more brackets may be provided on the cylinder body. Further, the collar may be omitted, the mounting bolt and the force receiving surface may be in direct contact with each other, and the side surface of the vehicle body frame may be in direct contact with one end surface of the elastic member. May be the same as the axial length of the bolt insertion hole.

1 is a cross-sectional front view of an essential part of a hydraulic master cylinder showing an embodiment of the present invention. II-II sectional view of FIG. The principal part disassembled perspective view which shows one example of this invention The front view of the state which attached the hydraulic master cylinder which shows one example of this invention to the vehicle body

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Hydraulic master cylinder, 2 ... Cylinder main body, 2a ... Car body mounting bracket, 3 ... Reservoir tank, 4 ... Bolt insertion hole, 5 ... Collar, 5a ... Flange, 6 ... Elastic member, 6a ... Notch part, 7 ... Mounting bolt, 7a ... male screw, 8 ... nut, 9 ... body frame, 10 ... cylinder hole, 11 ... piston, 14 ... brake pedal, 15 ... push rod, 16 ... hydraulic chamber, 19 ... union hole, 26 ... motorcycle , 27 ... Swing arm, 28 ... Rear wheel, 29 ... Rear axle, 30 ... Rear wheel brake, 31 ... Disc rotor, 32 ... Caliper bracket, 33 ... Caliper body, 34 ... Engine

Claims (6)

Installation of a hydraulic master cylinder in which a bolt insertion hole is drilled in a vehicle body mounting bracket projecting from the cylinder body of the hydraulic master cylinder, and the cylinder body is bolted to the vehicle body frame by a mounting bolt inserted into the bolt insertion hole. In the structure, the bolt insertion hole is provided with a force receiving surface that comes into contact with the mounting bolt side when the hydraulic master cylinder is operated, and an elastic member is attached to the inner peripheral surface of the bolt insertion hole excluding the force receiving surface, A hydraulic master cylinder mounting structure, wherein the vehicle body mounting bracket is bolted to the vehicle body frame via the elastic member. The hydraulic master cylinder mounting structure according to claim 1, wherein the force receiving surface is formed to protrude toward an inner peripheral side of the bolt insertion hole. The hydraulic master cylinder is a vertically mounted type in which a cylinder body has a vertically long cylinder hole, and a piston that is operated by pushing a push rod connected to an operating element is inserted into the cylinder hole. The hydraulic master cylinder mounting structure according to claim 1 or 2, wherein a plurality of brackets are arranged side by side in the cylinder axial direction, and the force receiving surface is formed on the push rod side of the bolt insertion hole. . 4. The hydraulic master cylinder mounting structure according to claim 3, wherein a reservoir tank for storing hydraulic fluid is formed integrally with the cylinder body. The axial length of the elastic member is formed longer than the axial length of the bolt insertion hole, and one end surface of the elastic member is in contact with the vehicle body frame. The hydraulic master cylinder mounting structure according to claim 1. The said attachment bolt is penetrated by the said elastic member through a collar | collar, The said force receiving surface and the said attachment bolt contact | abut via the said collar | collar. Mounting structure of hydraulic master cylinder.

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