JP2015096358A - Hydraulic master cylinder and brake device for bar-handle vehicle equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic master cylinder which can minimize invalid strokes of the piston, independently of dimensional tolerances of the stop plate and the circlip and the processing tolerance of a mounting groove for the circlip and a brake apparatus for bar-handle vehicles.SOLUTION: A piston 5 is inserted into a bottomed cylindrical cylinder hole 3b provided with a large-diameter hole 3c on the side of the opening part. The piston 5 has a sliding part which has a primary cup 6 attached on the side of the bottom part of the cylinder hole and a secondary cup 7 attached on the side of the opening part of the cylinder hole. In the large-diameter hole 3c, a stop plate 15 which comes in contact with the end part of the sliding part 5a to restrict the retreat limit of the piston and a circlip 9 intended to retain the stop plate 15 are mounted, and a disc spring 16 is arranged between the stop plate 15 and the circlip 9. The stop plate 15 is brought into contact with a step part 3d formed between the opening end part of the cylinder hole 3b and the large-diameter hole 3c by the disc spring 16.

Description

  The present invention relates to a hydraulic master cylinder and a bar handle vehicle brake device including the hydraulic master cylinder, and more particularly, to a hydraulic master cylinder in which a piston retreat limit is regulated by a stop plate and the hydraulic master cylinder. The present invention relates to a brake device for a bar handle vehicle provided.

  Conventionally, as a hydraulic master cylinder, a piston having a sliding part having a primary cup and a secondary cup is movably inserted into a cylinder hole having a large-diameter hole on the opening side of the cylinder hole. Some of them generate hydraulic pressure after closing the relief port that communicates with the reservoir. A stop plate and a circlip that prevents the stop plate from being attached to the large-diameter hole are installed. There is one that regulates the retreat limit of the piston by abutting on the part (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-271832 (5th page, FIG. 3)

  However, in the above-mentioned Patent Document 1, during the braking, the invalid stroke of the piston until the primary cup closes the relief port communicating with the reservoir is the dimensional tolerance of the stop plate and the circlip thickness, However, depending on the dimensional accuracy and processing accuracy of the stop plate, circlip, and mounting groove, the invalid stroke may be set to a large value. There was something I had to do.

  Therefore, the present invention includes a hydraulic master cylinder and the hydraulic master cylinder that can keep the invalid stroke of the piston small regardless of the dimensional tolerance of the stop plate and the circlip and the machining tolerance of the circlip mounting groove. An object of the present invention is to provide a brake apparatus for a bar handle vehicle.

  In order to achieve the above object, the hydraulic master cylinder of the present invention is configured such that a piston is movably inserted into a bottomed cylindrical cylinder hole having a large-diameter hole on the opening side. A sliding part with a primary cup on the side and a secondary cup on the cylinder hole opening side is provided, and the large diameter hole is in contact with the end of the sliding part to regulate the retreat limit of the piston. In a hydraulic master cylinder equipped with a stop plate and a circlip that prevents the stop plate from coming off, an elastic member is attached between the stop plate and the circlip, and the stop plate is attached by the elastic member. And a step formed between the open end of the cylinder hole and the large-diameter hole. Further, it is preferable that the elastic member and the stop plate abut on the center axis side of the cylinder hole with respect to the inner peripheral surface of the cylinder hole. Furthermore, it is preferable that the elastic member is formed of a disc spring provided with a plurality of protruding pieces in contact with the stop plate on the inner peripheral side.

  In the brake device for a bar handle vehicle according to the present invention, one of the front wheel brake and the rear wheel brake is a hydraulic brake and the other is a mechanical brake, and the hydraulic master cylinder and the lever are operated by operating the first brake operator. The hydraulic brake is operated independently through a master cylinder unit formed in combination with a mechanism, and the mechanical brake is operated by operation of a second brake operator, and through the master cylinder unit. In the bar handle vehicle brake device that operates the hydraulic brake in conjunction with each other, the master cylinder unit includes the hydraulic master cylinder and a lever mechanism described above.

  According to the hydraulic master cylinder of the present invention, the stop plate that restricts the retreat limit of the piston is brought into contact with the step formed between the opening end of the cylinder hole and the large-diameter hole by the elastic member. Therefore, the invalid stroke can be set small without considering the dimensional tolerance of the stop plate and the circlip and the machining tolerance of the circlip mounting groove. Further, since the processing of the step portion can be easily improved in accuracy, the influence of processing tolerance can be reduced. Furthermore, since high precision is not required for the processing of the plate thickness of the stop plate and the circlip and the mounting groove of the circlip, productivity can be improved.

  Further, since the elastic member and the stop plate are brought into contact with the center axis side of the cylinder hole rather than the inner peripheral surface of the cylinder hole, the stop plate is reliably brought into contact with the step portion to restrict the retreat limit of the piston. be able to. Furthermore, the elastic member can be made to exert a sufficient urging force in a limited space by being formed of a disc spring provided with a plurality of projecting pieces in contact with the stop plate on the inner peripheral side.

  Furthermore, according to the brake device for a bar handle vehicle of the present invention, the backward limit of the piston of the hydraulic master cylinder provided in the master cylinder unit is reliably regulated by the stop plate without increasing the accuracy of the components of the master cylinder unit. In addition, since the invalid stroke of the piston can be kept small, the cost can be reduced and the productivity can be improved.

It is II sectional drawing of FIG. It is principal part sectional drawing which shows the state which applied the hydraulic master cylinder of the 1st example of this invention to the hydraulic master cylinder apparatus. It is a top view which shows the state which similarly applied the hydraulic master cylinder to the hydraulic master cylinder apparatus. It is a disassembled perspective view of the stop plate of a hydraulic master cylinder, a disc spring, and a circlip similarly. It is explanatory drawing which shows the state which applied the hydraulic master cylinder of the 2nd example of this invention to the brake device for bar handle vehicles.

  1 to 4 illustrate an example in which the hydraulic master cylinder of the first embodiment of the present invention is applied to a hydraulic master cylinder device for a bar handle vehicle, and the hydraulic master cylinder device 1 of the present embodiment. Includes a hydraulic master cylinder 3 attached to a handlebar 2 that steers a front wheel (not shown) at the front of the vehicle body, and an operation lever 4 attached to the hydraulic master cylinder 3.

  In the hydraulic master cylinder 3, a cylinder hole 3b and a large-diameter hole 3c larger in diameter than the cylinder hole 3b are connected in a cylinder body 3a attached to the handle bar 2, and the piston 5 slides into the cylinder hole 3b. The moving part 5a is movably inserted through the primary cup 6 and the secondary cup 7, and a hydraulic chamber 8 is defined between the primary cup 6 and the cylinder hole 3b.

  The cylinder hole 3b is formed with a step portion 3d between the opening end portion and the large diameter hole 3c, and a circlip is provided at a position at a predetermined distance from the step portion 3d on the inner peripheral portion of the large diameter hole 3c. Nine mounting grooves 3e are formed. In addition, a relief port 10 communicating with the hydraulic pressure chamber 8 and a supply port 12 communicating with the replenishing fluid chamber 11 are formed on the upper side of the peripheral wall of the cylinder hole 3b, and the relief port 10 and the supply port 12 are The reservoir 13 is provided integrally with the upper portion of the cylinder body 3a.

  The piston 5 includes the sliding portion 5a that slides in the cylinder hole 3b and a small-diameter shaft portion 5b that protrudes from the cylinder hole 3b to the large-diameter hole 3c, and between the sliding portion 5a and the small-diameter shaft portion 5b. Has a stepped sliding portion end surface 5c. The sliding portion 5a includes a first sliding portion 5d, a second sliding portion 5e, and a third sliding portion 5f that are slightly smaller in diameter than the inner diameter of the cylinder hole 3b in this order from the bottom side of the cylinder hole 3b. It has been. A small-diameter tip shaft 5h provided with a small-diameter flange portion 5g projecting into the hydraulic chamber 8 is protruded from the first sliding portion 5d on the cylinder hole bottom side, and the first sliding portion 5d and the small-diameter flange portion 5g The primary cup 6 is fitted between the second sliding part 5e and the third sliding part 5f, and the secondary cup 7 is fitted between the second sliding part 5e and the first sliding part. A replenishing liquid chamber 11 is defined between 5d and 5d. A return spring 14 is contracted between the small diameter flange portion 5g and the bottom wall of the cylinder hole 3b, and the piston 5 is prevented from coming off by the sliding portion end surface 5c coming into contact with the contact surface 15a of the stop plate 15. ing.

  The stop plate 15 has an outer diameter slightly smaller than the inner diameter of the large-diameter hole 3c, an outer diameter smaller than the outer diameter of the sliding portion end surface 5c, and an inner diameter larger than the outer diameter of the small-diameter shaft portion 5b. It is formed in the ring shape provided. The circlip 9 is a well-known C-shaped clip, and a disc spring 16 (of the present invention) is provided between the circlip 9 mounted in the mounting groove 3e and the stop plate 15 disposed on the sliding portion end surface 5c side. Elastic member) is interposed. The disc spring 16 has an outer diameter slightly smaller than the inner diameter of the large-diameter hole 3c and an inner diameter slightly larger than the inner diameter of the stop plate 15, and gradually inclines toward the cylinder hole toward the inner periphery. A ring portion 16a formed on the outer peripheral side, and a plurality of projecting pieces 16b projecting from the ring portion 16 toward the inner peripheral side, the tip of the projecting piece 16b being the inner peripheral side of the stop plate 15 The stop plate 15 is pressed to the step 3d side, and the contact surface 15a of the stop plate 15 is pressed against the step 3d. The position where the tip of the protruding piece 16b contacts the stop plate 15 is closer to the central axis CL1 than the inner peripheral wall of the cylinder hole 3b. When the hydraulic master cylinder 3 formed in this way is in the non-operating state, the sliding part end surface 5c abuts against the stop plate 15, whereby the backward limit of the piston 5 is restricted.

  In the hydraulic master cylinder device 1 formed in this way, when the operation lever 4 is operated, the piston 5 is guided by the first sliding portion 5d, the second sliding portion 5e, and the third sliding portion 5f. After the primary cup 6 closes the relief port 10, the hydraulic fluid in the hydraulic chamber 8 is gradually increased in pressure and passed from the output port through a brake hose (both not shown). Sent to the front wheel brake to brake the front wheel brake.

  In this embodiment, as described above, the sliding portion end surface 5c of the piston 5 abuts, and the abutting surface 15a of the stop plate 15 that restricts the retreat limit of the piston 5 abuts on the step portion 3d by the disc spring 16. Therefore, the invalid stroke of the piston 5 can be set small without considering the dimensional tolerances of the stop plate 15 and the circlip 9 and the machining tolerances of the mounting groove 3e of the circlip 9. Can be improved. In addition, since the accuracy of the processing of the step portion 3d can be easily increased, the influence of processing tolerance can be reduced. Further, since the plate thickness of the stop plate 15 and the circlip 9 and the processing of the mounting groove 3e of the circlip 9 are not required to be high, productivity can be improved. Further, the stop plate 15 and the protruding piece 16b of the disc spring 16 abut on the center axis CL1 side with respect to the inner peripheral wall of the cylinder hole 3b, so that the stop plate 15 is brought into abutment with the step 3d without fail. It is possible to regulate the 5 backward limit.

  FIG. 5 shows an example in which the hydraulic master cylinder of the second embodiment of the present invention is applied to a master cylinder unit of a brake device for a bar handle vehicle, and shows the same components as those of the first embodiment. The same reference numerals are assigned, and detailed description thereof is omitted.

  The bar handle vehicle brake device 20 according to this embodiment includes a front wheel brake 21 and a rear wheel brake 22, a front wheel brake operation element 23, and a rear wheel brake operation element 24. The front wheel brake 21 and the front wheel brake operation are provided. A master cylinder unit 25 is interposed between the child 23, the rear wheel brake 22, and the rear wheel brake operation element 24.

  The front wheel brake 21 uses a hydraulic disc brake in which a caliper body 21b having a piston is combined with a disc rotor 21a that rotates integrally with the front wheel. The rear wheel brake 22 is a mechanical drum brake in which a pair of brake shoes 22b and 22b are disposed opposite to a back plate 22a so that the brake shoes 22b and 22b can be expanded. ing.

  The front wheel brake operation element 23 operates the operation lever 23a attached to the handle bar 26, whereby the first brake wire 27 is pulled, and the hydraulic master cylinder 3 of the master cylinder unit 25 is operated to operate the hydraulic pressure. The hydraulic pressure is supplied to the front wheel brake 21 via the pipe 28 to operate the front wheel brake 21 alone.

  The rear wheel brake operator 24 operates the operation lever 24 a attached to the handlebar 26 to pull the second brake wire 29 and operate the rear wheel brake 22 via the master cylinder unit 25. The wheel brake wire 30 is pulled to operate the rear wheel brake 22, and the hydraulic master cylinder 3 of the master cylinder unit 25 is operated to supply hydraulic pressure to the front wheel brake 21 via the hydraulic pipe 28. Then, the front wheel brake 21 is operated in conjunction.

  The master cylinder unit 25 is a combination of the hydraulic master cylinder 3 for supplying hydraulic pressure to the front wheel brake 21 and a lever mechanism 31. The lever mechanism 31 includes a first rotating lever 31a and a second rotating lever. A lever 31b, a knocker 31c, and an equalizer lever 31d are provided.

  The hydraulic master cylinder 3 is provided with a bottomed cylinder hole 3b in the cylinder body 3a with its lower end opened, and a piston 5 is movably inserted into the cylinder hole 3b. A hydraulic pressure chamber (not shown) is defined between the upper wall portion of the cylinder hole 3b and the piston 5, and an output port (not shown) communicating with the hydraulic pressure chamber is formed on the upper wall portion. One end side of the hydraulic pipe 28 is connected to the output port via a banjo 32a and a banjo bolt 32b. In addition, a return spring (not shown) is provided in the hydraulic pressure chamber, and the piston 5 is constantly urged toward the opening of the cylinder hole 3b by the elastic force of the return spring. A stop plate 15 that abuts against the sliding portion end surface 5c of the piston 5 is disposed in a step portion 3d formed between the large-diameter hole 3c formed at the lower end of the cylinder hole 3b and the cylinder hole 3b. A circlip 9 is mounted in the mounting groove 3e formed in the diameter hole 3c, and a disc spring 16 is interposed between the circlip 9 and the stop plate 15, and the stop plate 15 is moved by the disc spring 16. The contact surface 15a of the stop plate 15 that is pressed toward the step portion 3d and contacts the sliding portion end surface 5c of the piston 5 is pressed against the step portion 3d. As a result, in the non-operating state, the hydraulic master cylinder 3 is urged toward the cylinder hole opening by the elastic force of the return spring, as shown in FIG. The backward limit is restricted by the contact, and is arranged at the initial position.

  In the bar handle vehicle brake device 20 formed as described above, when the front wheel brake operation element 23 is operated from the non-operating state, the first brake wire 27 is pulled, and the first brake lever 31a is interposed. Then, the knocker 31c pushes the piston 5, and the hydraulic fluid whose pressure has been increased supplies the front wheel brake 21 with hydraulic pressure via the hydraulic pipe 28, thereby operating the front wheel brake 21 alone.

  When the rear wheel brake operator 24 is operated, the second brake wire 29 is pulled, and the rear wheel brake wire 30 is first pulled through the equalizer lever 31d to operate the rear wheel brake 22. start. Next, when the equalizer lever 31d receives a reaction force from the rear wheel brake side, the second turning lever 31b is pulled through the equalizer lever 31d, and the second turning lever 31b pushes the knocker 31c. The piston 5 is pushed by the knocker 31c, and the hydraulic fluid whose pressure has been increased supplies the front wheel brake 21 with hydraulic pressure via the hydraulic pipe 28, and the front wheel brake 21 is operated in conjunction with it.

  When the rear wheel brake operation element 24 is further operated, the rotation of the knocker 31c is stopped by the second rotation lever 31b coming into contact with the stopper bolt 33 and the rotation is restricted. The supply of hydraulic pressure is regulated. When the rear wheel brake operation element 24 is operated more strongly, the rear wheel brake wire 30 is pulled through the equalizer lever 31d, and only the rear wheel brake 22 is operated more strongly.

  Further, when the front wheel brake operation element 23 and the rear wheel brake operation element 24 are strongly input simultaneously, the first rotation lever 31a is rotated independently by being pulled by the first brake wire 27, and the piston 5, the front wheel brake 21 is strongly operated, and the movement of the equalizer lever 31 d pulled by the second brake wire 29 causes the second rotation lever 31 b to abut against the stopper bolt 33 and the rotation is restricted. After the state is reached, the equalizer lever 31d pulls the rear wheel brake wire 30 and strongly operates the rear wheel brake 22.

  In this embodiment, as described above, the dimensional accuracy of the first rotation lever 31a, the second rotation lever 31b, the knocker 31c, and the equalizer lever 31d constituting the master cylinder unit 25 and the dimensions of the circlip 9 and the stop plate 15 are described. Even if the accuracy and the processing accuracy of the mounting groove 3e for mounting the circlip 9 are not increased, the contact surface 15a of the stop plate 15 that contacts the sliding portion end surface 5c of the piston 5 and restricts the retreat limit of the piston 5 is provided. Since the disc spring 16 is in contact with the step portion 3d, the retreat limit of the piston 5 of the hydraulic master cylinder 3 can be reliably regulated by the stop plate 15 and the invalid stroke of the piston 5 can be kept small. Cost reduction and productivity can be improved.

  The hydraulic master cylinder of this embodiment is not limited to the above-described embodiments, and any hydraulic master cylinder such as a vertical hydraulic master cylinder or a tandem hydraulic master cylinder can be used. Can be applied. Further, the elastic member is not limited to the disc spring, and any member can be used as long as it can press the stop plate toward the stepped portion.

  Further, the brake device for a bar handle vehicle of the present invention is not limited to the above-described embodiment, the configuration other than the master cylinder unit is arbitrary, the rear wheel brake may be a hydraulic type, and the first 2 The brake operator can be a brake pedal. Furthermore, the master cylinder unit may not have an equalizer lever.

  DESCRIPTION OF SYMBOLS 1 ... Hydraulic master cylinder apparatus, 2 ... Handlebar, 3 ... Hydraulic master cylinder, 3a ... Cylinder body, 3b ... Cylinder hole, 3c ... Large diameter hole, 3d ... Step part, 3e ... Mounting groove, 4 ... Operation lever 5 ... piston, 5a ... sliding part, 5b ... small diameter shaft part, 5c ... sliding part end face, 5d ... first sliding part, 5e ... second sliding part, 5f ... third sliding part, 5g ... Small diameter flange portion, 5h ... Small diameter tip shaft, 6 ... Primary cup, 7 ... Secondary cup, 8 ... Hydraulic pressure chamber, 9 ... Circlip, 10 ... Relief port, 11 ... Replenishment liquid chamber, 12 ... Supply port, 13 ... Reservoir , 14 ... Return spring, 15 ... Stop plate, 15a ... Contact surface, 16 ... Disc spring, 16a ... Ring part, 16b ... Projection piece, 20 ... Brake device, 21 ... Front wheel brake, 21a ... Disc rotor, 21b ... Caliper D, 22 ... rear wheel brake, 22a ... back plate, 22b ... brake shoe, 22c ... anchor pin, 23 ... front wheel brake operator, 23a ... operation lever, 24 ... rear wheel brake operator, 24a ... operation lever, 25 ... Master cylinder unit, 26 ... Handle bar, 27 ... First brake wire, 28 ... Hydraulic pipe, 29 ... Second brake wire, 30 ... Brake wire for rear wheel, 31 ... Lever mechanism, 31a ... First rotation Lever, 31b ... second turning lever, 31c ... knocker, 31d ... equalizer lever, 32a ... banjo, 32b ... banjo bolt, 33 ... stopper bolt

Claims (4)

A piston is movably inserted into a bottomed cylindrical cylinder hole having a large-diameter hole on the opening side, and the piston has a primary cup on the cylinder hole bottom side and a secondary cup on the cylinder hole opening side. A stop plate that has an attached sliding portion, and that contacts the end of the sliding portion and regulates the retreat limit of the piston in the large-diameter hole; and a circlip that prevents the stop plate from coming off In the mounted hydraulic master cylinder, an elastic member is mounted between the stop plate and the circlip, and the stop plate is interposed between the opening end of the cylinder hole and the large-diameter hole by the elastic member. A hydraulic master cylinder characterized in that the hydraulic master cylinder is brought into contact with a step portion formed on the cylinder. 2. The hydraulic master cylinder according to claim 1, wherein the elastic member and the stop plate abut on the center axis side of the cylinder hole with respect to the inner peripheral surface of the cylinder hole. 3. The hydraulic master cylinder according to claim 1, wherein the elastic member is formed of a disc spring having a plurality of projecting pieces in contact with the stop plate on an inner peripheral side. 4. One of the front wheel brake and the rear wheel brake is a hydraulic brake, the other is a mechanical brake, and a master cylinder unit formed by combining a hydraulic master cylinder and a lever mechanism by operating the first brake operator. A bar handle vehicle that operates the hydraulic brake independently, operates the mechanical brake by operating a second brake operator, and operates the hydraulic brake in conjunction with the master cylinder unit. 4. A brake apparatus for a bar handle vehicle according to claim 1, wherein the master cylinder unit includes the hydraulic master cylinder according to any one of claims 1 to 3 and a lever mechanism.

Images