JP2007008243A - Braking device for bar handle vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a design property by arranging a reservoir at an unremarkable position, and improving an appearance of a master cylinder. <P>SOLUTION: This device comprises a primary master cylinder 3, and a secondary master cylinder 4 actuated by a first output hydraulic pressure of the primary master cylinder 3 and supplying a second output hydraulic pressure to a rear wheel side disc brake 5. The primary master cylinder 3 integrally comprises a first piston 32 moved by the actuation of a brake pedal 2, a first hydraulic pressure generating chamber 34, and a supplement liquid chamber 37 supplementing working liquid in a first cylinder hole 31. The secondary master cylinder 4 integrally comprises a second piston 45 moved by the first output hydraulic pressure, a second hydraulic pressure generating chamber 48, and a reservoir 41. The device has a first liquid passage 6 for supplying the first output hydraulic pressure to a second cylinder hole 42, and a second liquid passage 7 supplying the second output hydraulic pressure to a rear wheel side disc brake 5, so that the capacity of the reservoir 41 is made larger than the capacity of the supplement liquid chamber 37. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a brake device used for various bar handle vehicles such as motorcycles, motor tricycles, and three- and four-wheel buggy vehicles, and more particularly to a brake device for a bar handle vehicle with improved design.

In general, a master cylinder used in a brake device for a bar handle vehicle has a cylinder body in which a piston is movably inserted, and a reservoir that supplies hydraulic fluid in the cylinder body, and is integrally formed. The cylinder is provided integrally with the reservoir at the top of the cylinder body attached to the handlebar, and the master cylinder for the rear brake is provided at the side of the cylinder body attached to the vehicle body frame near the brake pedal. And 2).
Japanese Patent Laid-Open No. 2004-58887 JP 2004-42766 A

  However, in the above-described configuration, since a set amount of hydraulic fluid is stored in one reservoir, the reservoir having a relatively large volume is disposed at a conspicuous position of the vehicle body together with the master cylinder. For this reason, the appearance of the entire vehicle and the braking device are not excellent, and the layout of the vehicle is limited so that the large-capacity reservoir portion does not interfere with the operation.

  Therefore, the present invention provides a reservoir at an inconspicuous position of the vehicle body, improves the appearance of the master cylinder attached to the vehicle body frame in the vicinity of the handlebar and the brake pedal, improves design, and increases the degree of freedom of vehicle layout. An object of the present invention is to provide a brake apparatus for a bar handle vehicle that can improve the speed.

  In order to achieve the above object, a first invention is a bar handle vehicle braking apparatus comprising: a master cylinder operated by a brake operator; and a brake that brakes a wheel by an output hydraulic pressure of the master cylinder. The master cylinder includes a primary master cylinder that is operated by the brake operator, and a secondary master cylinder that is operated by a first output hydraulic pressure of the primary master cylinder and supplies a second output hydraulic pressure to the brake. The primary master cylinder is defined between the first piston inserted into the first cylinder hole and moved by the operation of the brake operator, and the first cylinder hole and the first piston. One hydraulic chamber and a replenishing fluid chamber for replenishing the working fluid into the first cylinder hole are integrally provided, and the secondary master cylinder is inserted into the second cylinder hole. A second piston that is moved by the first output hydraulic pressure output from the first hydraulic pressure chamber, a second hydraulic pressure chamber defined between the second cylinder hole and the second piston, A reservoir for supplying hydraulic fluid into the second cylinder hole is integrally provided, and the first liquid passage for supplying the first output hydraulic pressure to the second cylinder hole and the second hydraulic pressure chamber are output. A second fluid passage for supplying the second output fluid pressure to either the front wheel brake or the rear wheel brake, and the volume of the reservoir is made larger than the volume of the replenishment fluid chamber It is a feature.

  According to a second aspect of the present invention, the replenishing liquid chamber has a volume capable of storing hydraulic fluid for replenishing liquid loss in the first hydraulic pressure chamber and the first liquid passage.

  The third invention is characterized in that the volume of the first liquid passage is smaller than the volume of the second liquid passage.

  According to a fourth aspect of the present invention, the secondary master cylinder includes a third fluid passage that introduces a third output hydraulic pressure that operates the other brake and moves the second piston. It is characterized by moving by one or both of the first output hydraulic pressure and the third output hydraulic pressure.

  In the first aspect of the invention, a reservoir having a large volume is integrally provided in the secondary master cylinder, so that the primary master cylinder only needs to be provided with a small volume replenishing liquid chamber. By disposing in a place where there is no vehicle, the appearance of the braking device mounted on the vehicle can be improved.

  According to the second aspect of the present invention, the replenishing fluid chamber is provided with a working fluid for replenishing the fluid loss when the hydraulic fluid in the first fluid pressure chamber and the first fluid passage is damaged due to thermal expansion or the like. It is only necessary to have a volume that can be stored, and the volume of the replenishing oil chamber can be further reduced.

  According to the third aspect of the invention, the amount of the replenishing liquid chamber stored can be further reduced, and the volume of the replenishing liquid chamber can be further reduced.

  In the fourth aspect of the invention, the second output hydraulic pressure is supplied to either the front wheel side brake or the rear wheel side brake regardless of whether the front wheel side brake operator or the rear wheel side brake operator is operated. can do.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show a first embodiment of the present invention. FIG. 1 is an explanatory view showing a braking device for a rear wheel, and FIG. 2 is an explanatory view showing a vehicle mounted state of the braking device for a rear wheel. is there.

  The braking device 1 for the rear wheels includes a brake pedal (brake operator) 2, a primary master cylinder 3, a secondary master cylinder 4, a rear wheel disc brake 5, a primary master cylinder 3, and a secondary master. A first liquid passage 6 connecting the cylinder 4 and a second liquid passage 7 connecting the secondary master cylinder 4 and the rear wheel disc brake 5 are provided.

  The brake pedal 2 is pivotally supported by a support shaft 8 a provided on the right side of the vehicle body 8, and a primary master cylinder 3 is disposed vertically above the rear part of the brake pedal 2, and at the lower end of the primary master cylinder 3, A push rod 9 pivotally attached to the rear end of the brake pedal 2 is disposed so as to protrude.

  The primary master cylinder 3 is provided in a vertically long cylinder body 30 with a bottomed first cylinder hole 31 having a lower end opened in the first cylinder hole 31, and a first piston 32 and a first cup seal 33a. And the second cup seal 33b so as to be movable. A first hydraulic pressure generation chamber 34 is defined between the first piston 32 and the upper wall of the first cylinder hole 31, and a first union hole 35 communicates with the upper portion of the first hydraulic pressure generation chamber 34. Is provided.

  A return spring 36 is provided between the first piston 32 and the upper wall, and the first piston 32 is urged downward in the vehicle body, which is a non-operational direction, by the elastic force of the return spring 36 and moves backward. The limit is restricted by the contact of the head 9 a of the push rod 9 that is locked to the circlip engaged with the opening of the first cylinder hole 31.

  A replenishing fluid chamber 37 for storing the working fluid BF is formed from the upper part of the first cylinder hole 31 to the upper side, and a cap 37a is attached to the upper opening of the replenishing fluid chamber 37 via a diaphragm. . The replenishing fluid chamber 37 and the first cylinder hole 31 communicate with each other through a relief port 38a and a supply port 38b so that the working fluid BF can flow. The replenishing liquid chamber 37 stores the working liquid BF that replenishes the liquid loss when the first liquid pressure generating chamber 34 and the working liquid BF in the first liquid passage 6 cause liquid loss due to thermal expansion or the like. It is a small volume only by securing a possible volume.

  The secondary master cylinder 4 is integrally provided with a reservoir 41 at the top of a horizontally long cylinder body 40, and a second cylinder hole 42 is formed in the cylinder body 40. The second cylinder hole 42 is bolted to a lid member 43a having a hydraulic fluid introduction port 43 on the tip side, a second union hole 44 is provided on the bottom side, and a second piston is provided in the second cylinder hole 42. 45 is inserted through the first cup seal 46a and the second cup seal 46b so as to be movable. The hydraulic fluid introduction port 43 communicates with the first hydraulic pressure generation chamber 34 via the first union hole 35 and the first liquid passage 6, and the second union hole 44 communicates with the second liquid passage 7. The rear wheel side disc brake 5 communicates with a hydraulic pressure generating chamber (not shown).

  A hydraulic pressure receiving chamber 47 for the first output hydraulic pressure supplied from the primary master cylinder 3 is defined between the first cup seal 46 a and the tip wall 42 a of the second cylinder hole 42. In addition, a second hydraulic pressure generating chamber 48 is defined between the second cup seal 46b and the bottom wall 42b of the second cylinder hole 42, and a return spring 49 is contracted so that the second hydraulic pressure generating chamber 48 is not braked. The piston 45 is urged toward the tip end side of the cylinder hole by the elastic force of the return spring 49, and the tip end surface is in contact with the tip end wall 42a.

  The reservoir 41 has a cap 41b attached to the upper opening of the liquid storage chamber 41a via a diaphragm and a diaphragm plate, and communicates with the second cylinder hole 42 via a relief port 50a and a supply port 50b. The reservoir 41 and the second cylinder hole 42 are configured to allow the working fluid BF to flow therethrough. The reservoir 41 is a hydraulic fluid BF necessary for replenishing the liquid loss in the second hydraulic pressure generating chamber 48 and the second fluid passage 7 and ensuring the amount of fluid corresponding to the friction pad wear of the rear wheel disc brake 5. Is larger than that of the replenishing liquid chamber 37.

  The rear wheel side disc brake 5 is a well-known pin slide type disc brake. The piston is actuated by the second output hydraulic pressure introduced into the hydraulic pressure generating chamber via the second fluid passage 7, and the friction pad is used as a disc rotor. The rear wheel is braked by being brought into sliding contact with 5a.

  As shown in FIG. 2, the secondary master cylinder 4 is attached to the frame of the vehicle body 8 in the vicinity of the primary master cylinder 3 that is difficult to see from the outside, and the length of the brake hose constituting the first fluid passage 6 Is shorter than the length of the brake hose constituting the second liquid passage 7, and the volume of the first liquid passage 6 is smaller than the volume of the second liquid passage 7.

  In such a braking device 1, when the brake pedal 2 is operated, the push rod 9 moves upward to move the first piston 32 of the primary master cylinder 3 above the first cylinder hole 31, and the first cup seal After 33a closes the relief port 38a, the hydraulic fluid in the first hydraulic pressure generating chamber 34 is gradually increased in pressure. The increased first output hydraulic pressure is supplied to the hydraulic pressure receiving chamber 47 of the secondary master cylinder 4 through the first union hole 35, the first liquid passage 6, and the hydraulic fluid introduction port 43. As the first output hydraulic pressure is supplied to the hydraulic pressure receiving chamber 47, the second piston 45 moves to the bottom wall 42b side of the second cylinder hole 42, and the first cup seal 46a closes the relief port 50a. Thereafter, the hydraulic fluid in the second hydraulic pressure generating chamber 48 is gradually pressurized. The boosted second output hydraulic pressure is introduced into the hydraulic pressure generating chamber of the rear wheel disc brake 5 through the second union hole 44 and the second fluid passage 7 to operate the rear wheel disc brake 5. .

  The present embodiment is configured as described above, and the replenishing fluid chamber 37 of the primary master cylinder 3 is an operation for replenishing the liquid loss of the working fluid in the first fluid pressure generating chamber 34 and the first fluid passage 6. As long as the liquid BF can be stored, and the volume of the first liquid passage 6 is smaller than the volume of the second liquid passage 7, the volume can be reduced as much as possible. The degree of freedom can be increased. Furthermore, the reservoir 41 of the secondary master cylinder 4 that stores most of the hydraulic fluid BL necessary for the braking device 1 for the rear wheels is attached to the frame of the vehicle body 8 that is difficult to see from the outside together with the secondary master cylinder 4. Therefore, the appearance of the braking device 1 when mounted on the vehicle is improved, and the design can be improved.

  FIG. 3 is a braking device showing a second embodiment of the present invention in which a secondary master cylinder is used for an interlocking brake. The same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. To do.

  The secondary master cylinder 60 of the present embodiment is provided with a bottomed third cylinder portion 61 between the hydraulic pressure receiving chamber 47 and the lid member 43a of the secondary master cylinder 4 of the first embodiment. In the cylinder body 40 of the secondary master cylinder 4, a hydraulic fluid inlet 62 to which a part of the hydraulic pressure generated by the front wheel side disc brake 70 is supplied is formed in the hydraulic pressure receiving chamber 47.

  The front wheel side disc brake 70 is a well-known pin slide type disc brake. When the brake lever 71 is operated, the piston is operated by the hydraulic pressure introduced into the hydraulic pressure generating chamber, and the friction pad is brought into sliding contact with the disc rotor 70a. Thus, the front wheel is braked and a part of the hydraulic pressure is supplied to the hydraulic fluid inlet 62 via the third fluid passage 72.

  The third cylinder portion 61 is liquid-tightly inserted into the opening side of the second cylinder hole 42 through the sealing material 64a through the bottom wall 63a of the third cylinder hole 63, and the cylinder body 61a of the third cylinder portion 61 is The secondary master cylinder 4 is integrally attached to the secondary master cylinder 4 by bolting to the cylinder body 40 of the secondary master cylinder 4.

  The cylinder body 61 a is formed with the third cylinder hole 63 coaxially with the second cylinder hole 42 of the secondary master cylinder 4, and the front end side of the third cylinder hole 63 is provided with a hydraulic fluid inlet 43. It is closed with a member 43a. A third piston 65 is inserted into the third cylinder hole 63 via a third cup seal 66. The third piston 65 has a connecting shaft portion 65a at the tip, and the connecting shaft portion 65a is inserted into a through hole 63b provided in the bottom wall 63a through a seal member 64b and a hydraulic pressure receiving chamber 47 in the second cylinder hole 42. The end part is in contact with the second piston 45.

  A hydraulic pressure receiving chamber 67 for the first output hydraulic pressure supplied from the primary master cylinder 3 is defined between the third cup seal 66 and the tip wall 63 c of the third cylinder hole 63. In addition, an air chamber 68 is defined between the third cup seal 66 and the bottom wall 63a of the third cylinder hole 63, and a return spring 69 is contracted. The elastic force of 69 urges the cylinder hole tip side, and the tip surface abuts against the lid member 43a.

  In the braking device of this embodiment, when the brake pedal 2 is operated, the push rod 9 moves upward to move the first piston 32 of the primary master cylinder 3 above the first cylinder hole 31, and the first cup seal After 33a closes the relief port 38a, the hydraulic fluid in the first hydraulic pressure generating chamber 34 is gradually increased in pressure. The increased first output hydraulic pressure is supplied to the hydraulic pressure receiving chamber 67 of the third cylinder portion 61 through the first union hole 35, the first liquid passage 6, and the hydraulic fluid introduction port 43. As the first output hydraulic pressure is supplied to the hydraulic pressure receiving chamber 67, the third piston 65 opposes the return springs 49 and 69 while compressing the air in the air chamber 68, so that the second piston 45 is moved to the bottom wall. After the second cup seal 46b of the second piston 45 closes the relief port 50a, the hydraulic fluid in the second hydraulic pressure generating chamber 48 is gradually increased. The increased second output hydraulic pressure is introduced into the hydraulic pressure generating chamber of the rear wheel side disc brake 5 through the second union hole 44 and the second fluid passage 7 to operate the rear wheel side disc brake 5.

  On the other hand, when the brake lever 71 is operated to operate the front wheel disc brake 70 and the third output hydraulic pressure is supplied to the hydraulic pressure receiving chamber 47 through the third liquid passage 72 and the hydraulic fluid inlet 62, After the second piston 45 and the third piston 65 are separated from each other, only the second piston 45 moves toward the bottom wall 42b against the return spring 49, and the second cup seal 46b closes the relief port 50a. The hydraulic fluid in the second hydraulic pressure generating chamber 48 is gradually increased in pressure. The increased second output hydraulic pressure is introduced into the hydraulic pressure generating chamber of the rear wheel side disc brake 5 through the second union hole 44 and the second fluid passage 7 to operate the rear wheel side disc brake 5.

  Even if the brake pedal 2 and the brake lever 71 are operated simultaneously, the second piston 45 moves to increase the operating fluid in the second hydraulic pressure generating chamber 48 and operate the rear wheel disc brake 5. .

  In this embodiment, the second output hydraulic pressure can be supplied to the rear wheel disc brake 5 regardless of which of the brake pedal 2 and the brake lever 71 is operated. Similarly to the first embodiment, the replenishing fluid chamber 37 is used when the hydraulic fluid BF in the first fluid pressure generating chamber 34 and the first fluid passage 6 causes liquid loss due to thermal expansion or the like. The volume of the hydraulic fluid BF for replenishing the liquid loss is ensured only by securing a volume that can be stored. On the other hand, the reservoir 41 replenishes the liquid loss of the second hydraulic pressure generation chamber 48 and the second liquid passage 7 and It has a volume capable of storing the hydraulic fluid BF necessary to ensure the amount of fluid corresponding to the friction pad wear of the wheel-side disc brake 5, and has a larger volume than the replenishing fluid chamber 37.

Even if the interlocking brake system is provided in this way, the volume of the replenishing fluid chamber 37 of the primary master cylinder 3 can be made as small as possible, and the secondary master cylinder 60 is attached to the frame of the vehicle body 8 that is difficult to see from the outside. The design of the braking device at the time can be improved, and the degree of freedom in the layout of the vehicle can be increased.

  The hydraulic fluid introduction port 43 and the hydraulic fluid introduction port 62 in this embodiment are connected to the hydraulic fluid introduction port 43 by a third fluid passage 72 that supplies the third output hydraulic pressure from the front wheel side disc brake 70. The first liquid passage 6 that supplies the first output hydraulic pressure from the primary master cylinder 3 can also be connected to the introduction port 62. Further, the connecting shaft portion 65a provided at the tip of the third piston 65 can be formed integrally with the second piston 45, and the connecting shaft portion 65a is formed independently, It may be interposed between the two pistons 45. In this embodiment, the front wheel brake is the interlocking side, but the rear wheel brake can be the interlocking side.

  The present invention is not limited to being applied to a braking device for a rear wheel as in each of the above-described embodiments, but can also be applied to a braking device for a front wheel, and if applied to a braking device for a front wheel, The replenisher chamber of the primary master cylinder attached to the handlebar can be made smaller.

It is explanatory drawing which shows the braking device for rear wheels which shows the 1st form example of this invention. It is explanatory drawing which similarly shows the vehicle mounting state of the braking device for rear wheels. It is explanatory drawing which shows the braking device for rear wheels which shows the 2nd form example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Brake device, 2 ... Brake pedal, 3 ... Primary master cylinder, 4 ... Secondary master cylinder, 5 ... Rear wheel side disk brake, 5a ... Disc rotor, 6 ... 1st liquid path, 7 ... 2nd liquid path , 8 ... car body, 9 ... push rod, 30 ... cylinder body, 31 ... first cylinder hole, 32 ... first piston, 33a ... first cup seal, 33b ... second cup seal, 34 ... first hydraulic pressure generating chamber 35 ... first union hole 36 ... return spring 37 ... replenishing liquid chamber 38a ... relief port 38b ... supply port 40 ... cylinder body 41 ... reservoir 42 ... second cylinder hole 43 ... work fluid introduction Mouth, 44 ... second union hole, 45 ... second piston, 46a ... first cup seal, 46b ... second cup seal, 47 ... hydraulic pressure receiving chamber, 48 ... second hydraulic pressure generating chamber, 49 ... Rita 50a ... relief port, 50b ... supply port, 60 ... secondary master cylinder, 61 ... third cylinder part, 62 ... working fluid introduction port, 63 ... cylinder hole, 63a ... bottom wall, 63b ... insertion hole, 63c ... tip wall, 64a, 64b ... sealing material, 65 ... third piston, 65a ... coupling shaft, 66 ... third cup seal, 67 ... hydraulic pressure receiving chamber, 68 ... air chamber, 69 ... return spring, 70 ... front wheel side Disc brake, 70a ... Disc rotor, 71 ... Brake lever, 72 ... Third fluid passage

Claims (4)

In a bar-handle vehicle braking device including a master cylinder operated by a brake operator and a brake that brakes a wheel by an output hydraulic pressure of the master cylinder, the master cylinder is operated by the brake operator. A primary master cylinder, and a secondary master cylinder that is operated by a first output hydraulic pressure of the primary master cylinder and supplies a second output hydraulic pressure to the brake. The primary master cylinder has a first cylinder hole. A first piston that is inserted into the first piston and moves by the operation of the brake operator, a first hydraulic chamber defined between the first cylinder hole and the first piston, and a first cylinder hole. A replenishing fluid chamber for replenishing hydraulic fluid, and the secondary master cylinder is inserted into a second cylinder hole and output from the first hydraulic pressure chamber; A second piston that is moved by one output hydraulic pressure; a second hydraulic pressure chamber defined between the second cylinder hole and the second piston; and a reservoir that supplies hydraulic fluid into the second cylinder hole And a first fluid passage for supplying the first output fluid pressure to the second cylinder hole, and a second output fluid pressure output from the second fluid pressure chamber for a front wheel brake or a rear wheel. And a second liquid passage for supplying to one of the side brakes, wherein the volume of the reservoir is larger than the volume of the replenishing liquid chamber. 2. The bar handle vehicle according to claim 1, wherein the replenishing fluid chamber has a volume capable of storing hydraulic fluid for replenishing liquid loss in the first fluid pressure chamber and the first fluid passage. Braking device. The brake device for a bar handle vehicle according to claim 1 or 2, wherein the volume of the first liquid passage is smaller than the volume of the second liquid passage. The secondary master cylinder includes a third fluid passage that introduces a third output fluid pressure that operates the other brake and moves the second piston, and the second piston includes the first output fluid pressure and the first fluid pressure. The bar handle vehicle braking device according to any one of claims 1 to 3, wherein the brake device moves by both or any one of three output hydraulic pressures.

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