WO2012161311A1 - Brake fluid pressure control device and brake device using same - Google Patents

Abstract

The present invention addresses the problem of, while using advantages of a brake fluid pressure control device that controls the fluid pressure of only one of front and rear wheel systems and is advantageous to size reduction and cost, improving the response characteristics of the decompression of the brake fluid pressure control device. The brake fluid pressure control device is provided with, between a master cylinder (3) and a wheel cylinder (4), a pressure-increasing electromagnetic valve (7), a return flow path (8) arranged in parallel with the pressure-increasing electromagnetic valve and connected to a fluid pressure path (6), a pressure-decreasing electromagnetic valve (9), a plurality of pumps (10) for directly pumping up the brake fluid discharged from the wheel cylinder (4) and returning the pumped brake fluid to the fluid pressure path (6), a motor (11) for driving each pump at a time, and an electronic control unit (12). The pumps (10), the respective operation process phases of which are differentiated, are disposed in parallel with each other and built-in in the return flow path. The brake fluid pressure control device controls only the brake fluid pressure of the front or rear wheel system of an automatic two or three wheel vehicle.

Description

Brake fluid pressure control device and brake device using the same

The present invention relates to a brake fluid pressure control device equipped with an antilock control function mounted on a two-wheeled motor vehicle or a three-wheeled motor vehicle, and a brake device using the same.

As a brake fluid pressure control device having an anti-lock control function for a two-wheeled motor vehicle, for example, there are those shown in the following Patent Documents 1 and 2.

The brake fluid pressure control device disclosed in Patent Document 1 performs control of the brake fluid pressure for only one wheel, and the brake discharged from the wheel cylinder at the time of pressure reduction control inside the pump housing. A reservoir for taking in fluid is provided, which serves as a source of brake fluid for a powered pump built into the pump housing.

Further, the brake fluid pressure control device disclosed in Patent Document 2 performs control of the brake fluid pressure for two wheels in front and rear, and pumps up the brake fluid discharged from the wheel cylinder directly by a pump .

There are two pumps, and the two pumps are driven by a single motor, and each pump separately supplies the pumped brake fluid to the front and rear wheel cylinders for repressurization. This device has a reservoir in the master cylinder but no reservoir in the pump housing and is therefore referred to as a reservoirless type.

JP, 2010-229870, A Patent Document 1: Japanese Patent Application Publication No. 2001-301597

Since the brake fluid pressure control device of Patent Document 1 targets fluid pressure control for only one wheel, component parts such as a solenoid valve as compared with a brake fluid pressure control device for which the front and rear wheels are subjected to fluid pressure control Can be specified, and miniaturization and cost reduction can be prescribed. However, on the other hand, the reservoir provided inside the pump housing is an obstacle to the reduction in size of the pump housing, and there is a problem that the miniaturization of the device is limited.

Further, although the brake fluid pressure control device of Patent Document 2 is a reservoirless type, it is difficult to be restricted in miniaturization, but a piston pump generally adopted for ABS (anti-lock brake system) is a suction pump. Because the stroke of the discharge is repeated, it is not always possible to continuously pump up the brake fluid.

Therefore, in the configuration of Patent Document 2, at least one of the front wheel system and the rear wheel system is in the discharge stroke at the stage when the pressure reduction command of ABS is issued, and rapid pressure reduction can not be performed, and good responsiveness is obtained. I can not.

The present invention is responsive to the pressure reduction of the brake fluid pressure control device while taking advantage of the downsizing and cost advantageous brake fluid pressure control device that controls the fluid pressure of only one of the front wheel system and the rear wheel system. It is an issue to improve the quality.

In order to solve the above-mentioned problems, in the present invention, a brake hydraulic pressure control device is incorporated in a hydraulic pressure path between a master cylinder and a wheel cylinder operated by receiving a brake hydraulic pressure supplied from the master cylinder. A single pressure increasing solenoid valve, a return path in parallel with the pressure increase solenoid valve and connected to the fluid pressure path, a single pressure reducing solenoid valve inserted in the return path, and the return path A plurality of pumps incorporated in the middle of the pump to directly pump up the brake fluid discharged from the wheel cylinder via the pressure reducing solenoid valve and return it between the master cylinder of the hydraulic pressure path and the pressure reducing solenoid valve; The control command is issued to the pressure reducing solenoid valve and the pressure increasing solenoid valve by judging the necessity of pressure reduction and repressurization of the wheel cylinder and a single motor which drives each pump at once. It has an electronic control device,
The present invention provides a brake fluid pressure control device in which the plurality of pumps are incorporated in parallel in the return path with different phases (intake and discharge phases) of the operating stroke.
The brake fluid pressure control device is used to control the brake fluid pressure of the front wheel system or the rear wheel system of a two-wheeled motor vehicle or a three-wheeled motor vehicle.

The brake fluid pressure control device according to the present invention may use a gear pump in which suction and discharge proceed simultaneously as the pump, but one using a piston pump that alternately repeats a suction stroke and a discharge stroke The effectiveness is particularly pronounced.

Those using gear pumps tend to have larger drive motors, but piston pumps do not have this problem. The piston pump is preferably arranged radially around a piston drive cam rotated by the motor.

Further, the cam for driving the piston is preferably a circular eccentric cam having a drive shaft at a position eccentric from the center.

According to the present invention, one of the front wheel system and the rear wheel system is provided with the brake fluid pressure control device, and the other brake system does not control the fluid pressure generated by the master cylinder. Also provided is a brake device for a two-wheeled motor vehicle or a three-wheeled motor vehicle equipped with a general hydraulic brake device or mechanical brake device for supplying a wheel cylinder.

According to the brake fluid pressure control device of the present invention, since the brake fluid discharged from the wheel cylinder is directly pumped up and returned to the fluid pressure path between the master cylinder and the wheel cylinder, the reservoir for temporarily taking in the discharged brake fluid is pumped There is no need to provide it in the housing. For this reason, the device can be miniaturized.

In addition, since a plurality of pumps in which the phases of the operation strokes are different are incorporated in parallel and incorporated in one system, at least one pump always maintains the suction posture. Therefore, it is possible to rapidly reduce the wheel cylinder pressure of the system for which pressure reduction is required in response to the pressure reduction command of the ABS rapidly, and the control of the ABS is more reliable.

In the brake fluid pressure control device in which a plurality of piston pumps are radially arranged around a piston drive cam rotated by a motor, the phases of the operating strokes of the plurality of pumps naturally shift due to the arrangement.

A circular eccentric cam having a drive shaft at a position where the cam for driving the piston is eccentric from the center is used, and the number of piston pumps is n, and the n piston pumps are arranged at circumferential equal points In this case, the phase shift of the operating stroke of each pump is n / 360 °. This creates a state in which at least one of the pumps is in an intake position and at least one other is in a discharge position, allowing for rapid depressurization and rapid repressurization.

A circuit diagram showing an example of a brake fluid pressure control device according to the present invention and a brake device using the same Sectional view showing an example in which two piston pumps are combined in opposite postures with a circular eccentric cam for piston drive as a center

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a brake fluid pressure control device and a brake device using the same according to the present invention will be described below based on FIGS. 1 and 2 of the accompanying drawings.

The brake system shown in FIG. 1 is for a two-wheeled motor vehicle, and the front wheel system brake system FB and the rear wheel system brake system RB are independent, and the brake fluid pressure control of the present invention is performed on the front wheel system brake system FB. The device 1 is provided.

The brake fluid pressure control device 1 operates the brake lever 2 to operate the brake cylinder 2 to generate the brake fluid pressure, and receives the brake fluid pressure supplied from the master cylinder 3 to operate the brake piston etc. It is disposed between the wheel cylinder 4 and the wheel cylinder 4. The master cylinder 3 is accompanied by a reservoir 5 for supplying brake fluid.

In the middle of the fluid pressure passage 6 extending from the master cylinder 3 to the wheel cylinder 4, the pressure increasing solenoid valve 7, the return flow passage 8, the pressure reducing solenoid valve 9 inserted in the return flow passage 8, and It has a plurality of pumps 10 incorporated, a motor 11 for driving each pump, and an electronic control unit (ECU) 12. A pressure sensor for detecting the pressure of the wheel cylinder 4 may be provided in the brake fluid pressure control device in order to improve the brake control function. In that case, the pressure sensor may be incorporated inside the pump housing 21 in view of the simplification of the device.

Master cylinder 3 has a single output port, and the output port is connected to wheel cylinder 4 via hydraulic pressure passage 6, and a single pressure-boosting solenoid valve 7 is provided in the middle of hydraulic pressure passage 6. Each has been incorporated.

The return path 8 is connected in parallel with the pressure-increasing solenoid valve 7 and connected to the hydraulic path 6. Then, a single pressure reducing solenoid valve 9 is incorporated in the reflux passage 8, and further, the end of the reflux passage 8 (more upstream than the pressure increasing solenoid valve 7 on the upstream side than the master cylinder 3) than the pressure reducing solenoid valve 9. A plurality of pumps 10 are incorporated on the side where the confluence point C with a certain hydraulic pressure path 6 is considered as the end).

As the plurality of pumps 10, those having different operating stroke phases are incorporated in parallel arrangement. In addition, the motor 11 is one, and the single motor drives the pumps 10 collectively. The operating stroke of each pump is 180 degrees out of phase in the illustrated apparatus in which the number of installed pumps is two.

The brake fluid discharged from the wheel cylinder 4 is directly pumped up by each pump 10, so there is no reservoir for temporarily storing the fluid discharged from the wheel cylinder 4.

The electronic control unit 12 determines the necessity of pressure reduction and repressurization of the wheel cylinder 4 based on information input from a pressure sensor, a wheel speed sensor (not shown) or the like, and increases the pressure reduction electromagnetic valve 9 and the like. A control command is issued to the pressure solenoid valve 7. It is the same as a conventional brake fluid pressure control device having an ABS function.

The pump 10 is preferably a piston pump. An example in which two piston pumps are provided in the reflux path 8 is shown in FIG. As illustrated, in the pump housing 21, two stepped bores 10 a are provided facing each other with the cam chamber 22 interposed therebetween.

Further, two suction ports 23 and two discharge ports 24 are provided in the pump housing 21, a piston 10b is incorporated in each stepped inner hole 10a, and a piston return spring 10c for returning the piston is formed with a cylinder hole 27a. It is incorporated between the cylinder member 27 and the cylinder member 27. Further, a suction valve 10e and a discharge valve 10f are provided on the upstream side and the downstream side of the pump chamber 10d in correspondence with the respective pistons 10b, and two pumps 10, 10 are configured.

10g is a retainer fixed to each piston 10b, and a suction valve 10e is provided between the retainer 10g and the piston 10b, and further, between a cap 28 fluid-tightly attached to the pump housing 21 and the cylinder member 27 The discharge valve 10f is provided on the Although both the suction valve 10e and the discharge valve 10f have shown the well-known valve which consists of a valve body and the spring which biases it in the valve closing direction, it is not limited to this.

The two suction ports 23 merge into one and are connected to the discharge port of the pressure reducing solenoid valve 9. The two outlets 24 are joined into one and connected to the inlet port of the pressure-increasing solenoid valve 7.

In the cam chamber 22, a circular eccentric cam 26 having a drive shaft (which is an output shaft of the motor 11 or a rotational shaft connected to the output shaft) eccentrically integrated from the center is incorporated. The cam surfaces of the outer periphery of the cam 26 push the pistons 10b of the two pumps alternately. The two pumps 10, 10 are 180 ° out of phase with one another so that one of the pumps is always in the suction position and the other pump is always in the discharge position.

Since the two pumps 10, 10 are incorporated in the reflux path 8 in a parallel arrangement, the wheel cylinder pressure is reduced rapidly in response to the pressure reduction command, even without a reservoir for taking in the discharge fluid from the wheel cylinder. It is possible to secure the reliability of antilock control.

In addition, since it is not necessary to incorporate the reservoir in the pump housing, the device can be miniaturized. In the illustrated apparatus in which two piston pumps are disposed opposite to each other, for example, the pump housing can be miniaturized in the vertical direction of FIG.

Further, among the piston pumps employed in the brake fluid pressure control device, there is also one having a self-suction function (for example, JP-A-2011-64166), and the device of the present invention It can also be adopted.

The rear-wheel brake system RB shown in FIG. 1 operates a brake lever 13 to operate the master cylinder 14 for generating a brake fluid pressure, and receives a brake fluid pressure supplied from the master cylinder 14 to produce a brake piston or the like. It is a general hydraulic brake device without a hydraulic pressure control function which is constituted by a wheel cylinder 15 for operating the motor. A reservoir 16 is attached to the master cylinder 14. It is also conceivable to replace mechanical brake devices in this system.

The brake fluid pressure control device of the present invention can be used not only for two-wheeled vehicles but also for three-wheeled vehicles. There are two types of three-wheeled motor vehicles: one with one front wheel and two with two front wheels. In the case where the application target is the latter three-wheeled vehicle, the downstream side of the hydraulic pressure path 6 is branched into two and each branched path is connected to the wheel cylinder.

Reference Signs List 1 brake fluid pressure control device 2, 13 brake lever 3, 14 master cylinder 4, 15 wheel cylinder 5, 16 reservoir 6 fluid pressure passage 7 pressure increasing solenoid valve 8 return pressure passage 9 pressure reducing solenoid valve 10 pump 10a stepped inner hole 10b Piston 10c piston return spring 10d pump chamber 10e suction valve 10f discharge valve 10g retainer 11 motor 12 electronic control unit 21 pump housing 22 cam chamber 23 suction port 24 discharge port 25 drive shaft 26 eccentric cam 27 cylinder member 27a cylinder hole 28 cap FB front wheel System brake system RB Rear wheel system brake system C junction

Claims (4)

A brake fluid pressure control device (1) incorporated in a fluid pressure path (6) between a master cylinder (3) and a wheel cylinder (4) operated by receiving fluid pressure supplied from the master cylinder (3) A pressure-increasing solenoid valve (7), a reflux path (8) provided in parallel with the pressure-increasing solenoid valve (7) in the hydraulic pressure path (6), and a reflux path (8) And the brake fluid discharged from the wheel cylinder (4) via the pressure reducing solenoid valve (9). Drives a plurality of pumps (10) to be pumped up directly and recirculated between the master cylinder (3) of the hydraulic pressure path (6) and the pressure reducing solenoid valve (9), and each pump (10) collectively Single motor (11) and the wheel cylinder (4) A pressure, the pressure reducing solenoid valve to determine the need for recompression (9) and the electronic control unit issues a control command to the intensifying solenoid valve (7) to (12),
A brake fluid pressure control device in which the plurality of pumps (10) are incorporated in a parallel arrangement in the return path (8) with different operating stroke phases. The brake fluid pressure control device according to claim 1, wherein the pump (10) is a piston pump and the piston pump is radially disposed about a piston driving cam (26) which is rotated by the motor (11). The brake fluid pressure control device according to claim 2, wherein the piston drive cam (26) is a circular eccentric cam having a drive shaft at a position eccentric from the center. A hydraulic pressure control device according to any one of claims 1 to 3 is provided in one of the front wheel system and the rear wheel system, and the hydraulic pressure generated by the master cylinder in the other brake system. A brake system for a two-wheeled motor vehicle or a three-wheeled motor vehicle equipped with a hydraulic brake device or a mechanical brake device that supplies the wheel cylinder without controlling the wheel brake.

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