JP2805474B2 - Anti-lock brake device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Industrial Field of the Invention The present invention relates to an anti-lock brake device that brakes efficiently without locking wheels of a vehicle. Communication between the input and output hydraulic chambers and the cylinder body in which the input hydraulic chamber connected to the master cylinder and the output hydraulic chamber connected to the brake are formed inside the oil path connecting the brakes mounted on the wheels with the partition wall interposed. Operating between an on-off valve provided on the partition wall for controlling the shut-off and a first position for opening the on-off valve and a second position for closing the on-off valve and increasing the volume of the output hydraulic chamber; And a modulator comprising a control member disposed in the cylinder body for obtaining an actuator, which actuates the member in the direction of the second position when the wheel is about to lock. Consisting of Te relates to an improvement of. (2) Conventional technology Conventionally, this type of anti-lock brake device is, for example,
It is already known as disclosed in JP-A-61-27749. (3) Problems to be Solved by the Invention In a conventional anti-lock brake device, an actuator includes a hydraulic source including a hydraulic pump and an accumulator,
When the wheels are about to be locked, the actuator is composed of an electromagnetic valve that causes the hydraulic pressure of the hydraulic pressure source to act on the control member of the modulator to actuate it in the direction of the second position. There is a need for a hydraulic circuit that connects the actuator to the modulator, and there are problems such as an increase in the size of the entire device, and a large power consumption because the hydraulic source must be kept operating at all times. Is difficult to apply to small vehicles. The present invention has been made in view of such circumstances,
It is an object of the present invention to provide the anti-lock brake device which has a simple structure, is compact, and consumes less power. B. Configuration of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides an oil passage connecting a master cylinder and a brake mounted on a wheel. A cylinder body in which an output hydraulic chamber connected to the hydraulic chamber and the brake is formed with a partition interposed therebetween; an on-off valve provided in the partition for controlling communication and shutoff between the input and output hydraulic chambers; A modulator comprising a control member disposed in the cylinder so as to operate between a first position for valve opening and a second position for closing the on-off valve and increasing the volume of the output hydraulic chamber; An anti-lock brake device, comprising an actuator connected to the control member for actuating the member in the direction of the second position as the wheel is likely to lock, wherein the wheel is likely to lock the actuator. And an eccentrically fixed motor operatively connected to the output shaft of the electric motor, the rotator being driven by the output shaft to actuate the control member of the modulator in the direction of the second position. The control member is always resilient in the direction toward the rotation axis of the eccentric shaft, and when the electric motor is not operated, the eccentric shaft is biased and held at the bottom dead center position. And a spring for forcibly and automatically returning the control member to the first position. (2) Operation According to the above-mentioned feature, when the wheel is likely to lock during braking and the electric motor is operated, the eccentric shaft at the bottom dead center position is rotationally driven by the output shaft of the motor to control the control member of the modulator. It operates directly to the second position, which closes the on-off valve and increases the volume of the output hydraulic chamber,
The hydraulic pressure in the output hydraulic chamber, that is, the braking hydraulic pressure for the brake is reduced, and the locked state of the wheels is avoided beforehand. On the other hand, when the tendency of the wheel lock is lost by the above operation and the electric motor becomes inoperable, the control member of the modulator is forcibly moved to the first position by the elastic force of the spring while maintaining the engagement state with the eccentric shaft. Automatic return. In this case, the spring can quickly and surely return the eccentric shaft to the predetermined bottom dead center position in response to the inoperative state of the electric motor, and accordingly, the control member also moves the bottom dead center. It automatically returns to the first position corresponding to the position promptly. In particular, when the antilock operation is started, the eccentric shaft can start rotating smoothly from the bottom dead center position by driving the electric motor, and the control member always starts moving by the eccentric shaft at the bottom dead center position. Since the operation can be started from the state (first position), the rising characteristic of the antilock operation becomes very good. (3) Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, a master cylinder operated by a brake lever 1 is provided on a steering handle (not shown) of a motorcycle. A pair of left and right disc brakes 3 and 3 are provided on a front wheel W which is pivotally supported by a front fork F of the motorcycle. The output port 2a of the master cylinder 2 and the input port 3a of each disc brake 3 A modulator 5 is interposed in the middle of an oil passage 4 connecting between the two. In the oil passage 4, a section between the master cylinder 2 and the modulator 5 is referred to as an upstream oil path 4a, and a section between the modulator 5 and the disc brakes 3, 3 is referred to as a downstream oil path 4b. The modulator 5 includes a cylinder body 6 whose axis is directed vertically, and an outer wall thereof is provided with an inlet 7 and an outlet 8 to which the upstream oil passage 4a and the downstream oil passage 4b are connected, respectively. The partition wall 9 which partitions the inside into upper and lower parts is fixed to the inner peripheral wall. Furthermore the cylinder body 6, the first piston 10 ₁ on the lower side across the partition wall 9, and the second piston 10 _{and second} diameter larger than the first piston 10 ₁ is engaged in sliding respectively on the upper side. Both pistons 1
0 ₁ and 10 ₂ are piston rods penetrating the partition wall 9 slidably.
Are interconnected via 11. Thus, between the partition wall 9 and the first piston 10 ₁ the inlet 7 and the input hydraulic pressure chamber 12 communicating with, and the output hydraulic chamber 13 each picture communicating with the outlet 8 between the partition wall 9 and the second piston 10 ₂ Is done. Between the second piston 10 ₁ and the upper end wall of the cylinder body 6 spring chamber 14 is defined, a piston rod 11, the eccentric shaft to the lower (i.e. below via a seat plate 15 which is fixed to the upper end A return spring 16 resilient in the direction toward the rotation axis 26 is accommodated in the spring chamber 14. The partition wall 9 is provided with a through-hole 17 communicating between the input and output hydraulic chambers 12 and 13. The through-hole 17 is provided with a poppet valve 18 which can be opened and closed, and a poppet valve 18 which is closed upward. The valve spring 19 that urges toward the valve position is housed. The poppet valve 18, the second piston 10 ₂ returns to downward limit abutting the upper surface of the partition wall 9, is pushed by the piston 10 ₂ is adapted to open. In the above, the first and second pistons 10 ₁ and 10 ₂ and the piston rod 11 constitute a control member of the present invention, and the through hole 17, the poppet valve 18 and the valve spring 19 constitute an on-off valve of the present invention. An actuator 20 for operating the modulator 5 is connected to the modulator 5. The actuator 20, the comprises a cam case 21 continuing integrally at the lower end of the cylinder body 6, it is allowed a lower end of the said to cam case 21 first piston 10 ₁ is projected. The cam case 21 has a cup shape with the right end closed and the left end opened, and a frame of the electric motor 22 is attached to the open end.
23 is bound. Output shaft 24 of the electric motor 23, while being disposed to be perpendicular to the axis in the first piston 10 ₁ lower, bearing the tip cam case 21
It is supported through 25. The output shaft 24 has an eccentric shaft 26 functioning as a rotary cam.
There is fixed, this is the outer periphery of the eccentric shaft 26 is mounted a roller bearing 27 as a bearing, the outer race 27a of the bearing 27, against the first piston 10 ₁ lower end surface serving as the input end of the control member In contact. The eccentric shaft 26 is connected to the first piston via a roller bearing 27.
10 ₁ is engaged with the lower end surface. A balance weight 26a for balancing the rotation of the eccentric shaft 26 is integrally formed. The electric motor 22 is connected to a battery 29 via a control circuit 28 such as a microcomputer, and the control circuit 28
When it is determined that the front wheel W is likely to be locked based on a signal from the sensor 30 attached to the front fork F, the electric motor 22 and the battery 29 are operated to conduct. Referring next to the operation of this embodiment, in the normal state, as shown in FIG. 1, the second piston 10 ₂ opens the poppet valve 18 positioned downward limit, thereby entering,
Since the output hydraulic chambers 12 and 13 are in communication, if the master cylinder 2 is operated by operating the brake lever 1,
The output oil pressure from the output port 2a passes through the upstream oil passage 4a, the input oil pressure chamber 12, the through hole 17, the output oil pressure chamber 13, and the downstream oil passage 4b, and acts on both disc brakes 3, 3, to the front wheel W. A braking force is applied. During this time, the eccentric shaft 26 returns the elastic force of the spring 16 receives from the first piston 10 ₂ via a roller bearing 27 is held in the bottom dead center. If the front wheel W is likely to be locked during such braking, the control circuit 28 determines the state based on a signal from the sensor 30 and makes the electric motor 22 and the battery 29 conductive. Is activated, and the output shaft 24 rotates the eccentric shaft 26 from the bottom dead center toward the top dead center. Then, the eccentric shaft 26, since the first piston 10 ₁ via a roller bearing 27 pushes up the second piston 10 ₂ via the piston rod 11 be moved upward away from the poppet valve 18. As a result, the poppet valve 18 closes and enters with the force of the valve spring 19, and shuts off between the output hydraulic chambers 12 and 13. Then, according to the subsequent lifting action of the eccentric shaft 26, as shown in FIG. 3, the output hydraulic pressure chamber in response to the second piston 10 _{and second} upward 1
3 increases, and the oil pressure in the chamber 13, that is, the braking oil pressure for both disc brakes 3, 3, is reduced.
Lock state is avoided beforehand. In this case, the rotation angle of the output shaft 24 is restricted to a predetermined angle so that the eccentric shaft 26 does not reach the top dead center, and the eccentric amount of the eccentric shaft 26 with respect to the output shaft 24 is set to be sufficiently large. I have. When the rotation of the front wheel W recovers, the electric motor 22 is deenergized.
10 ₂ is pushed back downward, the volume of the output hydraulic chamber 13 is reduced, the braking hydraulic pressure is increased, and the braking force of the front wheel W is recovered. When there is a request to further increase the braking force, the second piston
Since 10 ₂ moves to the lower limit and opens the poppet valve 18, the high hydraulic pressure of the input hydraulic chamber 12 is supplied to the output hydraulic chamber 13,
The braking oil pressure is further increased. By repeating the above operation at a high speed, the front wheel W
Is efficiently braked without locking. As described above, since the actuator 20 mechanically applies the rotating force of the electric motor 22 to the modulator 5 via the eccentric shaft 26, the structure is extremely simple, and a hydraulic circuit is provided between the modulator 5 and the actuator 20. It is not necessary, and as a result, the modulator 5 and the actuator 20 can be formed into one compact assembly. Further, since the electric motor 22 is operated only at the time of the anti-lock control for both disc brakes 3, 3,
The power consumption for its operation is extremely low. C. Effects of the Invention As described above, according to the present invention, the actuator is driven by the electric motor that operates in response to the possibility of the wheels being locked, and is eccentrically fixed to the output shaft of the electric motor. An eccentric shaft, which is rotationally driven by a shaft and engages the control member of the modulator in the direction of the second position to engage with the member, so that when braking, when the wheels are likely to lock, the electric motor is operated, By rotating the eccentric shaft by its output shaft and directly operating the control member of the modulator toward the second position, wheel lock can be avoided, and thus the structure of the actuator as a whole is simple and the modulator and the actuator can be simplified. There is no need for a hydraulic circuit between them, which greatly contributes to downsizing of the anti-lock brake device, and the electric motor Since Tsu suffice caused to operate click control only during fewer the power consumption for its operation, it can be relatively easily adapted to smaller vehicles. In addition, the control member is constantly resiliently moved in a direction toward the rotation axis of the eccentric shaft, and when the electric motor is not operated, the eccentric shaft is biased and held at the bottom dead center position to force the control member to the first position. Since the automatic return spring is provided, the spring force of the spring returns the eccentric shaft to the predetermined bottom dead center position quickly and surely in response to the electric motor becoming inoperative, and the control member of the modulator is controlled. It is possible to quickly and automatically return to the first position corresponding to the bottom dead center position. Therefore, even if the power supply to the electric motor becomes impossible, the control member can always be automatically returned to the first position and the on-off valve can be kept in the open state, so that normal braking can be performed without any trouble. When the antilock operation is started, the eccentric shaft can start rotating smoothly from the bottom dead center position by driving the electric motor, and the control member is controlled by the eccentric shaft at the bottom dead center position. Can always be operated from the initial movement state (first position), so that the rising characteristics of the antilock operation are very good. In addition, because the power for returning the control member is obtained by using the spring force of the spring,
The power consumption of the electric motor can be further reduced. When a bearing is provided on the outer periphery of the eccentric shaft and the outer race of the bearing is brought into contact with the input end of the control member as in the embodiment, a relatively large-diameter bearing can be arranged on the outer periphery of the eccentric shaft. Thus, the load can be smoothly and smoothly transmitted from the eccentric shaft to the control member via the large-diameter bearing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall view showing an essential part of an embodiment of an anti-lock brake device of the present invention, and FIG. 2 is II-II in FIG.
FIG. 3 is a sectional view taken along the line II, and FIG. 3 is an operation explanatory diagram of the modulator and the actuator in FIG. W ... front wheel, 2 ... master cylinder, 2a ... output port, 3 ... disk brake, 3a ... input port, 4 ...
... oil passage, 4a ... upstream oil passage, 4b ... downstream oil passage, 5 ... modulator, 6 ... cylinder body, 10 ₁ , 10 ₂ , 11 ... first and second pistons constituting control members and Piston rod, 12…
... input hydraulic chamber, 13 ... output hydraulic chamber, 16 ... return springs as springs, 17, 18, 19 ... through holes, poppet valves and valve springs constituting on-off valves, 20 ... actuators, 22 ... Electric motor, 24 ... Output shaft, 26 ... Eccentric shaft, 27 ... Roller bearing as bearing, 28 ... Control circuit, 30 ...
Sensor

Claims (1)

(57) [Claims] In the oil passage (4) connecting the master cylinder (2) and the brake (3) mounted on the wheel (W), the input hydraulic chamber (12) and the brake (3) connected to the master cylinder (2).
An output hydraulic chamber (13) connected to a cylinder body (6) formed inside with a partition (9) interposed therebetween, and an input and output hydraulic chamber (12, 1)
3) Opening / closing valves (17 to 19) provided on the partition (9) so as to control connection and disconnection between them; a first position for opening the on / off valves (17 to 19); A control member (10 ₁ , 10 ₂ , 11) disposed in the cylinder body (6) so as to be able to operate between a second position for closing the valve 19 and increasing the volume of the output hydraulic chamber (13). ) modulator (5) interposed consisting a, in its control member (10 _1, 10 _2, 11), the member according to the wheel (W) is about to lock (10 _1, 10 _2, 11) An anti-lock brake device comprising an actuator (20) connected in the direction of the second position, wherein the actuator (20) is operated in response to the wheel (W) being locked. (22) and eccentrically fixed to the output shaft (24) of the electric motor (22), and the motor is rotated and driven by the output shaft (24). Control member Jureta (5) (10 _1, 10 _2, 11) said member to operate the direction of the second position (10 _1, 10 _2, 11) more constitute an eccentric shaft which engages with (26) to The control member (10 ₁ , 10 ₂ , 11) is constantly resilient in a direction toward the rotation axis of the eccentric shaft (26), and the electric motor (22)
The spring (16) for automatically returning the control members (10 ₁ , 10 ₂ , 11) to the first position by urging and holding the eccentric shaft (26) at the bottom dead center position when is not operated. An anti-lock brake device, comprising: 2. A bearing (27) is provided on the outer periphery of the eccentric shaft (26), and an outer race (27a) of the bearing (27) is brought into contact with an input end (10 ₁ ) of the control member (10 ₁ , 10 ₂ , 11). The anti-lock brake device according to claim 1, wherein: