JP4084430B2 - Brake device for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motorcycle or other vehicle brake comprising a master cylinder, a hydraulic actuator that operates with the output hydraulic pressure of the master cylinder, and a mechanical wheel brake coupled to the hydraulic actuator via a mechanical transmission system. Relates to the device.
[0002]
[Prior art]
Such a brake device is applied to, for example, a motorcycle in which a mechanical rear wheel brake is operated by an output hydraulic pressure of a master cylinder (see, for example, Japanese Utility Model Laid-Open No. 2-57767).
[0003]
In this case, in order to keep the mechanical rear wheel brake in an operating state during parking, in the conventional system, a parking lever that can be locked in the operating state is rearranged via a mechanical transmission system that is different from the hydraulic actuator system. The parking mechanism is connected to the wheel brake.
[0004]
[Problems to be solved by the invention]
As described above, the conventional brake device with a parking mechanism requires two mechanical transmission systems, that is, a hydraulic actuator and a parking mechanism, which not only makes the structure complicated, but also when adjusting the play of the rear wheel brake, The mechanical transmission system must be performed, and there are drawbacks such as complicated adjustment work.
[0005]
An object of the present invention is to provide a vehicle brake device with a parking mechanism that eliminates such drawbacks.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a master cylinder that is operated by a driver's hand via a brake lever, a hydraulic actuator that operates with the output hydraulic pressure of the master cylinder, and is to be operated by the hydraulic actuator. A mechanical wheel brake coupled to the hydraulic actuator via a mechanical transmission system, and the hydraulic actuator introduces an output hydraulic pressure of the master cylinder into the cylinder supported by a fixed support portion. An actuating piston fitted to define a hydraulic chamber, a return spring for biasing the actuating piston toward the hydraulic chamber, and a fixed support portion pivotally supported between the actuating piston and the mechanical transmission system was constituted by the output lever operatively connected, in the brake system for a vehicle, and the brake lever is provided separately and independently Pas Interlocking parking cable to the output lever is pulled by the operation of the King lever, while being connected, between the support part and its output lever, a parking mechanism which can lock the output lever in the operative position at the operating conditions In the state where the hydraulic actuator is in an inoperative state in the operating state of the parking mechanism and the operating force is released from the parking lever, play is provided between the operating piston and the output lever, the parking mechanism may feature that in the operating state of this, it is possible to unlock state of the output lever according to actuate strongly the hydraulic actuator based on the operation of the brake lever by the operator's hand to.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0008]
First, a first embodiment of the present invention will be described with reference to FIGS. In Figure 1, the motorcycle steering handle H, the first master cylinder M ₁ which is operated via the first brake lever 1 ₁ by the right hand of the operator, through the second brake lever 1 ₂ by the left hand A second master cylinder M ₂ to be operated is provided.
[0009]
Front wheel brake Bf for braking a front wheel (not shown), the front, middle, is configured hydraulically with three hydraulic pot 2 ₁ to 2 ₃ of the rear, be supplied with hydraulic pressure to either of the hydraulic pot actuation It is supposed to be. The output port 4 of the first master cylinder M ₁ is connected to the front and rear pots 2 ₁ and 2 ₃ via a hydraulic conduit 3, and the second master cylinder M ₂ is connected to the intermediate pot 2 ₂ via a hydraulic conduit 5. The output port 6 is connected, and a delay valve 7 is interposed in the hydraulic conduit 5. Therefore, the front wheel brake Bf can be actuated by the output hydraulic pressure regardless of which one of the first and second master cylinders M ₁ and M ₂ is operated. However, when the second master cylinder M ₂ is operated, the output hydraulic pressure is There the supply of hydraulic pressure to the intermediate pot 2 ₂ is prevented by the delay valve 7 until a predetermined value h (see FIG. 9) rises.
[0010]
A rear wheel brake Br for braking a rear wheel (not shown) is configured as a mechanical type including a pair of brake shoes 8 and an operation lever 10 that expands the brake shoes 8 via a cam 9. The brake shoe 8 is extended when it is turned to the right.
[0011]
The output port 6 of the second master cylinder M ₂ is connected to the input port 12 of the hydraulic actuator A via the hydraulic conduit 5 and the hydraulic conduit 11 branched from the middle thereof, and is connected to an output lever 13 which is an output member of the hydraulic actuator A. It is connected to the operating lever 10 of the rear wheel brake Br via a Bowden brake cable 14 (mechanical transmission system). A proportional pressure reducing valve 15 is interposed in the hydraulic conduit 11. When the output hydraulic pressure of the second master cylinder M ₂ is supplied to the hydraulic actuator A, the proportional pressure reducing valve 15 keeps the output hydraulic pressure constant after the output hydraulic pressure exceeds a certain value t (see FIG. 9). It is transmitted to the hydraulic actuator A while reducing the pressure at a ratio.
[0012]
A known adjusting device 17 for adjusting the play of the rear wheel brake Br and the brake cable 14 is provided at the connecting portion between the brake cable 14 and the operating lever 10.
[0013]
The hydraulic actuator A is provided with a parking mechanism P that can be locked with the rear wheel brake Br in an operating state. The parking mechanism P is provided with a parking lever 16 that is pivotally supported at an appropriate position of the vehicle body to operate the parking mechanism P. It is connected via a type parking cable 18.
[0014]
The hydraulic actuator A and parking mechanism P will be described with reference to FIGS.
[0015]
The hydraulic actuator A has a cylinder 22 that is fixed to a mounting substrate 20 (support portion) fixed at a proper position on the rear portion of the vehicle body with a bolt 21. The cylinder 22 is fitted with an operating piston 25 that divides the inside into a hydraulic chamber 23 and a spring chamber 24, the input port 12 is opened in the hydraulic chamber 23, and the operating piston 25 is hydraulically operated in the spring chamber 24. A return spring 26 for energizing the chamber 23 is housed. The operating piston 25 integrally has a rod portion 25 a that penetrates the spring chamber 24 and protrudes out of the cylinder 22, and has an outer end of the I-type output lever 13 supported by the pivot 27 on the mounting substrate 20. The brake cable 14 is connected to the lower end of the output lever 13.
[0016]
The parking mechanism P includes a ratchet pawl 30 that is swingably supported by the support shaft 28 at the upper end of the output lever 13, and a fan-shaped ratchet gear that is formed around the pivot 27 of the mounting substrate 20 and cooperates with the ratchet pawl 30. 31. The ratchet claw 30 integrally has an operation arm 30a extending in the opposite direction to the claw portion, and the inner wire 18i of the parking cable 18 is connected to the operation arm 30a via a link 32. The outer tube 18o of the parking cable 18 is fixed to a support arm 33 that is formed integrally with the mounting substrate 20 and extends above the operation arm 30a. The ratchet pawl 30 is connected to the ratchet gear 31 between the support arm 33 and the link 32. The return spring 34 is urged in a direction away from the return spring 34.
[0017]
As shown in FIGS. 4 and 5, the ratchet gear 31 is provided in a pair of left and right with the output lever 13 interposed therebetween, and the ratchet pawl 30 is formed in a bifurcated shape correspondingly. A stopper arm 35 (see FIGS. 2 and 5) that defines an inoperative position of the ratchet pawl 30 spaced from the ratchet gear 31 is formed on the output lever 13.
[0018]
Next, the operation of this embodiment will be described.
[0019]
FIG. 2 shows an inoperative state of the hydraulic actuator A and the parking mechanism P. In this case, in the hydraulic actuator A, the operating piston 25 is held by the return spring 26 to a position where the volume of the hydraulic chamber 23 is minimized, and in the parking mechanism P, the ratchet pawl 30 is returned to the inoperative position separated from the ratchet gear 31. It is held by a spring 34.
[0020]
Now, when the operation of the second master cylinder M ₂ supplies the output hydraulic pressure to the hydraulic chamber 23 of the hydraulic actuator A, the working piston 25 as shown in FIG. 6 is compressed matterゝadvancing spring 26 back receiving the hydraulic pressure Then, the brake cable 14 is pulled by swinging the output lever 13 in the direction of the arrow b, and the rear wheel brake Br is operated. At this time, the ratchet pawl 30 of the parking mechanism P only swings with the output lever 13 and does not engage with the ratchet gear 31.
[0021]
The second master output hydraulic cylinder M _2, since also supplied to the front wheel brake Bf is operated it as described above, in this case, front and rear wheel brakes Bf, the interlock operating state of Br obtained.
[0022]
Next, in the state where the rear wheel brake Br is operated by the operation of the hydraulic actuator A as described above, the parking cable 18 is pulled by the operation of the parking lever 16, and the operating arm 30a is moved to the arrow c as shown in FIG. When it is swung in the direction, the ratchet pawl 30 is engaged with the ratchet gear 31 and the output lever 13 is locked in its operating state. Therefore, as shown in FIG. 8, even after the hydraulic actuator A is returned to the non-operating state and the operating force is released from the parking lever 16, the rod portion 25 a of the operating piston 25 only moves forward from the output lever 13. Thus, the locked state of the output lever 13 is maintained, and the operating state of the rear wheel brake Br can be maintained. That is, when the hydraulic actuator A is in the non-operating state in the operating state of the parking mechanism P and the operating force is released from the parking lever 16 (the state shown in FIG. 8), it is between the operating piston 25 and the output lever 13. Play is provided.
[0023]
When parking, even if the hydraulic actuator A is operated with the parking lever 16 being operated first, the operating state of the parking mechanism P can be obtained in the same manner as described above.
[0024]
To release the operating state of the parking mechanism P is temporarily is strongly actuates the hydraulic actuator A by the operation of the second master cylinder M _2. Then, as the output lever 13 is slightly swung in the operation direction by the operation piston 25, the ratchet pawl 30 is separated from the ratchet gear 31 by the elastic force of the return spring 34, and the parking mechanism P is released. The second releasing the master cylinder M _2, if caused to return the hydraulic actuator A inoperative, can be returned to the rear wheel brake Br inoperative.
[0025]
FIG. 10 shows a second embodiment of the present invention. The hydraulic pot 2 of the front wheel brake Bf communicates only with the output port 4 of the first master cylinder M ₁ . The steering handle H is provided with a slave cylinder S on one side of the first master cylinder M ₁ , and an output port 6 of the second master cylinder M ₂ is connected to the hydraulic conduit 5 ′ to the input port 37 of the slave cylinder S. Is communicated via. The piston of the slave cylinder S and the piston of the first master cylinder M ₁ are connected to each other via an interlocking lever 40 pivotally supported on a cylinder body 38 common to both cylinders M ₁ and S, and the interlocking thereof. The first brake lever ₁₁ is integrally coupled to the lever 40. Other configurations are the same as those of the previous embodiment, and in the figure, the same reference numerals are given to portions corresponding to the previous embodiment.
[0026]
And Thus, when actuating the first master cylinder M ₁ by the first operation of the brake lever 1 _1, it is possible to operate the front wheel brake Bf by the output hydraulic pressure.
[0027]
Further, if operation of the second master cylinder M ₂ by the second operation of the brake lever 1 _2, the output hydraulic pressure conduit 5 'is output to the 11. The hydraulic pressure output to the hydraulic conduit 5 ′ is supplied to and operates the slave cylinder S, and the slave cylinder S operates the first master cylinder M ₁ via the interlocking lever 40, so that the first master cylinder M _The front wheel brake Bf is operated by the output hydraulic pressure of ₁ .
[0028]
On the other hand, the hydraulic pressure output to the hydraulic conduit 11 is supplied to the hydraulic actuator A to operate the same as in the previous embodiment, thereby operating the rear wheel brake Br. Thus, when the second master cylinder M ₂ is operated, the front and rear wheel brakes Bf and Br can be operated simultaneously.
[0029]
FIG. 11 shows a third embodiment of the present invention. A modulator 43 controlled by an electronic control unit 42 is interposed between two hydraulic conduits 3 and 5, and the hydraulic conduit 11 is connected from the modulator 43. The configuration is the same as that of the first embodiment except that the hydraulic conduit 11 is not provided with a proportional pressure reducing valve. In the figure, the parts corresponding to the first embodiment are the same as those in the first embodiment. A sign is attached.
[0030]
The modulator 43 allows the output hydraulic pressure of the first master cylinder M ₁ to be transmitted to the front and rear hydraulic pots 2 ₁ and 2 ₃ before the front wheel brake Bf as long as the front and rear wheels do not tend to lock, and the second the output hydraulic pressure of the master cylinder M ₂ is allowed to transmit to the intermediate pressure pot 2 ₂ and the hydraulic actuator a of the front wheel brake Bf. During braking, when the electronic control unit 42 calculates input signals from the front and rear wheel rotational speed sensors 44f and 44r and determines that the front and rear wheels have a tendency to lock, the unit 42 detects the hydraulic conduits 3, 5 Are cut off and the downstream side hydraulic pressure and the hydraulic pressure of the hydraulic conduit 11 are reduced to moderately weaken the braking force of the front and rear wheel brakes Bf and Br, and avoid the locked state of the front and rear wheels.
[0031]
The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention. For example, in the third embodiment of FIG. 11, a proportional pressure reducing valve 15 similar to that of the first embodiment of FIG. Instead of the brake cable 14, a link or a rod can be used. The present invention can also be applied to a brake device for a tricycle or a four-wheel vehicle in which the rear wheel brake is mechanically configured.
[0032]
【The invention's effect】
As described above, according to the present invention, the master cylinder operated by the operator's hand via the brake lever, the hydraulic actuator that operates with the output hydraulic pressure of the master cylinder, and the hydraulic actuator, A mechanical wheel brake coupled to the hydraulic actuator via a mechanical transmission system, and the hydraulic actuator includes a cylinder supported by a fixed support portion and a hydraulic chamber for introducing the output hydraulic pressure of the master cylinder into the cylinder. An actuating piston that is fitted to define, a return spring that urges the actuating piston toward the hydraulic chamber, and an output that is pivotally supported by a fixed support portion and interlocks between the actuating piston and the mechanical transmission system. is constituted by a lever, the brake device for a vehicle, the operation of the parking lever is a brake lever provided separately and independently Since the towed parking cable is linked and connected to the output lever, and a parking mechanism is provided between the output lever and the support portion so that the output lever can be locked in the operating position. , it is possible to maintain the operating state of the wheel brake via the output lever and mechanical transmission system connected to that of the hydraulic actuator, thus parking Organization dedicated mechanical transmission system is unnecessary, simply simplify the structure and the brake adjustment Can be achieved. The ratio between the piston stroke of the hydraulic actuator and the traction stroke of the mechanical transmission system can be changed by appropriately selecting the lever ratio of the output lever. Furthermore, since the parking cable pulled by the operation of the parking lever is linked and connected to the output lever, and the parking mechanism is provided between the output lever and the support portion, a parking mechanism with a simple structure can be obtained.
[0033]
Further, when the hydraulic actuator is in the non-operating state and the operating force is released from the parking lever in the operating state of the parking mechanism, play is provided between the operating piston and the output lever, and the parking mechanism is in the operating state. Thus, the locked state of the output lever can be released in accordance with the strong actuation of the hydraulic actuator based on the operation of the brake lever by the operator's hand.
[Brief description of the drawings]
FIG. 1 is an overall view of a motorcycle brake device according to a first embodiment of the present invention. FIG. 2 is a partially longitudinal side view showing a hydraulic actuator and a parking mechanism in FIG. 2 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is a sectional view taken along line 4-4 in FIG. 2. FIG. 5 is a view taken in the direction of the arrow 5 in FIG. Side view corresponding to FIG. 2 showing the operation of the parking mechanism FIG. 8 Side view corresponding to FIG. 2 showing the operating state of the parking mechanism FIG. 9 Front and rear wheel brakes FIG. 10 is an overall view of a motorcycle brake device according to a second embodiment of the present invention. FIG. 11 is an overall view of a motorcycle brake device according to a third embodiment of the present invention. Explanation】
A Hydraulic actuator Br Rear wheel brake as a mechanical wheel brake M _{2 Second} master cylinder as a master cylinder P Parking mechanism 1 ₂ Brake lever 13 Output lever 14 Brake cable 16 as a mechanical transmission system Parking lever 18 Parking brake cable 20 Support Mounting board 23 as part Hydraulic chamber 25 Actuating piston

Claims (1)

A master cylinder (M ₂ ) that is operated by the operator's hand via the brake lever (1 ₂ ), a hydraulic actuator (A) that operates with the output oil pressure of the master cylinder (M ₂ ), and this hydraulic actuator (A A mechanical wheel brake (Br) connected to the hydraulic actuator (A) via a mechanical transmission system (14).
The hydraulic actuator (A) is a cylinder (22) supported by a fixed support portion (20), and a hydraulic chamber (23) for introducing the output hydraulic pressure of the master cylinder (M ₂ ) into the cylinder (22). And a return spring (26) for biasing the operation piston (25) toward the hydraulic chamber (23), and a fixed support portion (20). In the vehicular brake device constituted by an output lever (13) that is supported and interlocked between the operating piston (25) and the mechanical transmission system (14),
The interlock brake lever (1 ₂₎ and the parking cable (18) is the output lever which is pulled by the operation of the parking lever provided separately and independently (16) (13), while being connected, the output lever (13 ) And the support portion (20), a parking mechanism (P) that can lock the output lever (13) in the operating position in the operating state is provided ,
When the hydraulic actuator (A) is in an inoperative state in the operating state of the parking mechanism (P) and the operating force is released from the parking lever (16), the operating piston (25) and the output lever (13) play is provided between
When the parking mechanism (P) is in the activated state, the output lever (13) is activated in response to a strong actuation of the hydraulic actuator (A) based on the operation of the brake lever (1 ₂ ) by the operator's hand. The vehicle brake device can be unlocked .

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