JPH0665136U - Hydraulic control valve for brake hydraulic pressure control - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a hydraulic control valve for controlling a brake hydraulic pressure, which can be reduced in size and weight, and which can suppress the strength of parts other than the valve body to a necessary minimum. [Structure] A return spring 4d for urging the spool 4 in the pressure reducing direction, and a spool 4 slidably provided on the shaft center portion of one end surface of the spool 4 in the pressure increasing direction by a reaction force of the master cylinder hydraulic pressure. A pilot piston 65 that presses, a reaction piston 64 that is slidably provided on the shaft center portion of the other end surface of the spool 4, and that pushes back the spool 4 in the pressure reducing direction by the reaction force of the output hydraulic pressure; A valve provided with a plunger portion 54 on the outer periphery of one end surface of the spool 4 provided with 65 and an ABS solenoid 5 for pulling back the spool 4 in the pressure reducing direction, and a master cylinder hydraulic connection hole c provided with the spool 4. It is formed on the outer peripheral portion of the body 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a brake fluid pressure control fluid pressure control valve capable of controlling an output fluid pressure relative to a supply fluid pressure.

[0002]

[Prior art]

 BACKGROUND ART Conventionally, as a hydraulic pressure control valve for controlling a brake hydraulic pressure, for example, one described in JP-A-4-87867 has been known.

This conventional brake hydraulic pressure control hydraulic pressure control valve is incorporated in a brake hydraulic pressure control device for the purpose of controlling the hydraulic pressure supplied to the wheel cylinder with respect to the master cylinder hydraulic pressure, and is external. The spool that adjusts the output hydraulic pressure supplied to the wheel cylinder by sliding it with the hydraulic pressure supplied from the hydraulic pressure source and the master cylinder hydraulic pressure slides to increase the output hydraulic pressure of the spool. A pilot piston that presses in the pressure direction and a push-type solenoid that is provided in the opposite direction with the spool sandwiched between the pilot piston and presses the spool in the output fluid pressure reduction direction via the push rod. Was equipped with.

[0004]

[Problems to be solved by the device]

 However, in such a conventional hydraulic control valve, as described above, the solenoid and the pilot piston are independently arranged at both ends of the valve spool, and the space between the solenoid plunger portion and the spool is provided. Has a push rod interposed in it, and because the master cylinder hydraulic pressure introduction part (pipe connection part) is provided on the extension line of the spool shaft, the hydraulic control valve is long in the axial direction. Therefore, there is a problem that it is difficult to reduce the size and weight.

Further, since a force such as a fastening torque is applied to the introduction portion of the master cylinder hydraulic pressure when connecting the external pipe, there is a problem that the strength of the introduction portion must be increased more than necessary.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to reduce the size and weight of a hydraulic control valve and to minimize the strength of parts other than the valve body. It is an object of the present invention to provide a hydraulic pressure control valve for brake hydraulic pressure control that can be suppressed.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, in the hydraulic control valve for brake hydraulic pressure control of the present invention, the external hydraulic connection from the external hydraulic pressure supply source and the drain tank are slidably provided in the valve body. Spool that regulates the output fluid pressure by connecting one of the drain connections to the output fluid pressure connection side, the return spring that biases the spool in the direction to reduce the output fluid pressure, and the spool One of the end faces is slidably provided on the shaft center part, and the projecting end of the one end abuts the stopper, and the other end face receives the master cylinder hydraulic pressure, so that the output hydraulic pressure is generated by the pressure receiving reaction force. The pilot piston that presses the spool in the direction of increasing pressure and the other end surface of the spool are provided in a sliding manner at the shaft center of the other end surface. By receiving pressure A reaction force piston that pushes back the spool in the direction of reducing the output fluid pressure by the reaction force and the piston part is provided on the outer circumference of one end surface of the spool on which the pilot piston is provided, with at least its axial movement restricted. A master cylinder hydraulic pressure connection for supplying master cylinder hydraulic pressure to the other end surface of the pilot piston, which is equipped with a pressure reducing solenoid that pulls back the spool in a direction that reduces the output hydraulic pressure by suction force. The portion is formed on the outer peripheral portion of the valve body on which the spool is provided.

[0008]

[Action]

 Since the brake fluid pressure control valve of the present invention is configured as described above, the spool slides in the direction of increasing the output fluid pressure in proportion to the master cylinder fluid pressure received by the pilot piston. To be done. That is, the spool is arranged at a position where the reaction force of the pilot piston due to the reception of the master cylinder hydraulic pressure and the reaction force of the reaction force piston as the feedback force + the biasing force of the return spring are balanced, and the spool of the pilot piston The output hydraulic pressure is increased in proportion to the received pressure reaction force.

Next, when a current is applied to the pressure-reducing solenoid, the suction force pulls the spool back in the direction of reducing the output hydraulic pressure against the pressure-reaction force of the pilot piston. Immediately, the spool is arranged at a position where the pressure receiving reaction force of the pilot piston due to the pressure reception of the master cylinder hydraulic pressure and the reaction force reaction force of the piston as the feedback force + the biasing force of the return spring + the suction force are balanced. The output fluid pressure is reduced in proportion to the applied current.

A pilot piston is provided on the axial center portion of one end surface of the spool, and a plunger portion of a pressure reducing solenoid is provided on the outer periphery of one end surface of the spool on which the pilot piston is provided. The piston and the plunger part overlap each other in the axial direction, and the plunger part is directly connected to the spool without a push rod or the like, which shortens the axial length. Becomes

Further, as described above, since the master cylinder hydraulic connection portion is formed on the outer peripheral portion of the valve body on which the spool is provided, the external connection piping work is performed on the outer peripheral portion of the valve body. Therefore, the strength of the parts other than the valve body can be suppressed to the minimum necessary.

[0012]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the configuration of the embodiment will be described.

FIG. 1 is a sectional view showing a hydraulic pressure control valve 7 for controlling a brake hydraulic pressure according to an embodiment of the present invention. In the drawing, reference numeral 1 denotes a valve body, and this valve body 1 has a valve hole 1 1 Has been drilled. Further, in the valve hole 11, a hydraulic pressure supply annular port 11a, a drain annular port 11b, and a master cylinder annular port 11c are formed in order from the left.

The hydraulic pressure supply annular port 11a, the drain cyclical port 11b, and the master cylinder port 11c are an external hydraulic pressure connection hole a and a drain connection, which are formed on the outer peripheral surface of the valve body 1, respectively. The external hydraulic pressure supply source 6, the drain tank T, and the master cylinder 2 are respectively connected through a hole b and a master cylinder hydraulic pressure connection hole c.

A valve spool 4 is slidably incorporated in the valve hole 11. On the outer circumference of the valve spool 4, an output annular communication groove 4a is formed at an intermediate position between the hydraulic pressure supplying annular port 11a and the drain annular port 11b so as to overlap both annular ports 11a and 11b. The variable throttles s and t are formed between the output annular communication groove 4a and the both annular ports 11a and 11b. An output hydraulic pressure connection hole d for connecting to the wheel cylinder 3 of the brake device in each wheel is formed on the valve hole 11 side facing the output annular communication groove 4a.

That is, when the valve spool 4 slides to the left in the drawing, the throttle opening of the variable throttle s expands with the variable throttle t being closed, which causes the hydraulic pressure supply annular port. Since the external hydraulic pressure is supplied from the 11a side to the output annular communication groove 4a side, the hydraulic pressure of the wheel cylinder 3 changes to increase, while the valve spool 4 moves in the right direction in the drawing, contrary to the above. Sliding on, the throttle opening of the variable throttle t expands with the variable throttle s closed, which causes hydraulic pressure to be discharged from the output annular communication groove 4a side to the drain annular port 11b side. Therefore, the hydraulic pressure of the wheel cylinder 3 changes in the direction of decreasing.

At the outer peripheral position of the right end of the valve spool 4 in the drawing, an ABS (decompression) solenoid 5 for sliding the valve spool 4 by the suction force generated by energization is provided. When the solenoid 5 is energized, the valve spool 4 is slid to the right in the drawing to reduce the hydraulic pressure in the wheel cylinder 3.

Each of the solenoids 5 includes a solenoid body portion B, a coil portion K, and a plunger portion 54.

The solenoid body B is fitted to the base 51 fixed to the end surface of the valve body 1 with a bolt 60 b, an intermediate cylinder 56 fitted and fixed to the base 51, and the intermediate cylinder 56. It is composed of a suction member 58.

The coil portion K includes a coil 53 that generates a magnetic field, a hobbin 55 that is made of a non-magnetic material around which the coil 53 is wound, and a coil casing 52 that covers the outer circumference of the hobbin 55. . The coil portion K is detachably attached to the outer circumference of the solenoid body portion B, and is replaceably attached by a fastening nut 59 screwed to the outer circumference of the end portion of the suction member 58.

A through hole 57 that forms a plunger chamber 62 having a diameter larger than that of the valve hole 11 is formed in the center of the base 51, and the plunger portion 54 slides in the through hole 57 via the bush 100. It is housed freely. The plunger portion 54 is attached to the small-diameter portion 4b integrally formed at the right end of the valve spool 4 in the drawing with its axial movement restricted.

The attracting member 58, the coil casing 52, the base 51, the bush 100, and the plunger portion 54 are each made of a magnetic material, and these members form a magnetic loop. It has become. A magnetic leakage portion 61 having a triangular cross section is formed on the inner end surface of the attraction member 58 to generate a force to attract the plunger portion 54.

On the other hand, on the left end surface of the valve body 1 in the drawing, a back chamber cover 17 that forms a back chamber 17a is attached and fixed to the end surface of the valve spool 4 with a bolt 60a. A return spring 4d is interposed in a compressed state between the end surface of the valve 4 and the end surface of the valve 4, and the repulsive force presses and urges the valve spool 4 to the right in the drawing. Therefore, when the master cylinder hydraulic pressure is not input, the valve spool 4 is pressed to the right in the drawing, and the output hydraulic pressure of the output hydraulic pressure connection hole d connected to the wheel cylinder 3 becomes the atmospheric pressure state. ing.

A stopper pin 80 is provided at the axial center of the inner end surface of the back chamber cover 17 so as to project toward the end surface of the valve spool 4, while the valve spool facing the stopper pin 80. A piston sliding hole 63 communicating with the output hydraulic connection hole d via the output annular communication groove 4a is formed in the axial center of the end surface of No. 4, and a cylindrical reaction force is formed in the piston sliding hole 63. A piston 64 is slidably provided.

On the other hand, a pilot chamber 66 communicating with the master cylinder annular port 11c is formed at the axial center portion of the end surface of the small diameter portion 4b of the valve spool 4 facing the inner end surface of the suction member 58 also serving as a stopper. A cylindrical pilot piston 65 is slidably inserted into the pilot chamber 66.

Further, the back chamber 17a and the plunger chamber 62 are communicated with each other through the damping preventing orifices 12 of the valve spool 4, and although not shown in the drawing, an annular drain port is provided. It is connected to the reservoir tank T via 11b.

A drive current from the brake controller 13 is applied to the coil 53 of the solenoid 5, and detection signals from the vehicle speed sensor 18 and the wheel rotation sensor 19 are input to the brake controller 13. It

Next, the operation of the embodiment will be described.

(B) At the time of connecting external piping When connecting the external connection piping from the external hydraulic pressure supply source 6, the drain tank T, the master cylinder 2 and the wheel cylinder 3 to the hydraulic pressure control valve 7, Since the external hydraulic pressure connection hole a, the drain connection hole b, the master cylinder hydraulic pressure connection hole c, and the output hydraulic pressure connection hole d, which are pipe connection parts, are all formed on the outer peripheral portion of the valve body 1. All the pipe connecting work is performed on the valve body 1.

Therefore, no extra force such as fastening torque is applied to the parts other than the valve body 1 in connection with the pipe connecting work, so that the strength of the parts other than the valve body 1 can be suppressed to the necessary minimum.

(B) Non-braking When the brake pedal is not depressed, the master cylinder 2 in each wheel has a master cylinder hydraulic pressure of 0, so that the brake hydraulic pressure control hydraulic control valve 7 has a return spring 4d. The valve spool 4 is pressed and slid to the right in the drawing by the setting force of, and the output hydraulic pressure of the output hydraulic pressure connection hole d is O.

Therefore, the hydraulic pressure supplied to each wheel cylinder 3 is also O, and the brake device is in the inoperative state.

(C) During normal braking When the brake pedal is depressed, the master cylinder hydraulic pressure of the master cylinder 2 rises according to the pedaling force, and the brake hydraulic pressure control hydraulic pressure control valve 7 controls this hydraulic pressure to the master pressure. The pilot piston 65 receives pressure via the cylinder hydraulic pressure connection hole c, the master cylinder annular port 11c, and the pilot chamber 66, and pushes and slides the pilot piston 65 in the right direction in the drawing. When the sliding of the valve is restricted by the suction member 58, the pressure received by the pilot piston 65 acts as a reaction force on the valve spool 4, and the valve spool 4 is moved to the left in the drawing against the set force of the return spring 4d. Since the slide is pressed and slid, the output hydraulic pressure of the output hydraulic connection hole d is increased, and the hydraulic pressure supplied to each wheel cylinder 3 is increased.

On the other hand, the output hydraulic pressure of the output hydraulic pressure connection hole d is received by the reaction force piston 64 through the output annular communication groove 4 a and the piston sliding hole 63, and the reaction force piston 64 is When the slide of the reaction force piston 64 is regulated by the stopper pin 80, the pressure receiving reaction force of the reaction force piston 64 acts on the valve spool 4 as a feedback force. As a result, the valve spool 4 is pushed back to the right in the drawing.

That is, the valve spool 4 is arranged at a position where the pressure receiving reaction force of the pilot piston 65 and the pressure receiving reaction force of the reaction force piston 64 + the setting force of the return spring 4d are in balance with each other. The hydraulic pressure of is controlled to a value proportional to the master cylinder hydraulic pressure. That is, the braking force is generated according to the depression force of the brake pedal.

(D) During ABS operation During sudden braking or braking on a low μ road such as a snowy road, the frictional resistance of the tire against the road surface is smaller than the frictional resistance of the wheel by the braking device, and the tire slips. Then, the wheels are locked.

Therefore, in the brake controller 13, when the slip state of the tire is detected from the vehicle speed detected by the vehicle speed sensor 18 and the wheel rotation speed detected by the wheel rotation sensor 19, the slip amount is determined according to the slip amount. A drive current is applied to the ABS solenoid 5 of the brake fluid pressure control fluid pressure control valve 7.

As described above, when a current is applied to the ABS solenoid 5, a magnetic loop is formed by the attraction member 58, the coil casing 52, the base 51, the bush 100, and the plunger portion 54, and the attraction is performed. An attractive force that causes the plunger 54 to slide to the right in the drawing is generated in the magnetic leakage portion 61 having a triangular cross section formed on the inner end surface of the member 58, which causes the valve spool 4 to receive pressure against the pilot piston 65. It is pulled back to the right in the drawing against the force.

That is, the valve spool 4 is arranged at a position where the pressure receiving reaction force of the pilot piston 65 generated by the brake operation and the pressure receiving reaction force of the reaction piston 64 + the setting force of the return spring 4d + the suction force balance with each other. In other words, the valve spool 4 is pulled back in the right direction in the drawing by the amount of the suction force, which reduces the output hydraulic pressure (the hydraulic pressure supplied to the wheel cylinder 3) and reduces the braking force of the wheels. The slip amount of is reduced.

In the brake controller 13, the detected slip amount and the preset proper slip amount (braking force) are constantly compared, and the ABS is adjusted so that the detected slip amount becomes the proper slip amount. The increase / decrease control of the current value applied to the solenoid 5 is performed.

As described above, in this embodiment, the effects listed below can be obtained.

The pilot piston 65 and the plunger portion 54 of the solenoid 5 are overlapped in the axial direction, and the plunger portion 54 is directly connected to the valve spool 4 without a push rod or the like. Therefore, the length in the axial direction is shortened, whereby the hydraulic control valve 7 can be made smaller and lighter, and the mountability on the vehicle is improved.

Since an extra force such as a fastening torque accompanying the pipe connecting work does not act on the portion other than the valve body 1, the strength of the portion other than the valve body 1 can be suppressed to the necessary minimum.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the present invention can be made even if there are design changes and the like within the scope not departing from the gist of the present invention. Included in the device.

[0045]

[Effect of device]

 As described above, in the brake fluid pressure control fluid pressure control valve of the present invention, the pilot piston is provided at the axial center portion of one end surface of the spool, and the spool having the pilot piston is provided. By providing the pressure reducing solenoid plunger part on the outer circumference of one end face, the pilot piston and the plunger part overlap in the axial direction, and the plunger part is directly connected to the spool without a push rod or the like. Therefore, the length in the axial direction is shortened, which makes it possible to reduce the size and weight of the hydraulic pressure control valve and to improve the vehicle mountability.

Further, since the master cylinder hydraulic pressure connection portion for supplying the master cylinder hydraulic pressure is formed on the outer peripheral portion of the valve body where the spool is provided, the strength of the portion other than the valve body is minimized to the required minimum. The effect is that it can be suppressed.

[Brief description of drawings]

FIG. 1 is a sectional view showing a hydraulic pressure control valve for brake hydraulic pressure control according to an embodiment of the present invention.

[Explanation of symbols]

1 Valve Body 4 Valve Spool 4d Return Spring 5 ABS Solenoid (Pressurizing Solenoid) 6 External Hydraulic Pressure Supply Source 7 Hydraulic Pressure Control Valve 54 Plunger 58 Adsorption Member (Stopper) 64 Reaction Piston 65 Pilot Piston 80 Stopper a External Hydraulic Pressure Connection hole (external hydraulic pressure connection part) b Drain connection hole (drain connection part) c Master cylinder hydraulic pressure connection hole (master cylinder hydraulic pressure connection part) d Output hydraulic pressure connection hole (output hydraulic pressure connection part) T Drain tank

Claims (1)

[Scope of utility model registration request] 1. A valve body is slidably provided to connect either an external hydraulic pressure connection portion from an external hydraulic pressure supply source or a drain connection portion to a drain tank to an output hydraulic pressure connection portion side. A spool that regulates the output hydraulic pressure by this, a return spring that biases the spool in the direction that reduces the output hydraulic pressure, and a spool that is slidably provided on the axial center of one end face of the spool Part contacts the stopper and receives the master cylinder hydraulic pressure on the other end surface to press the spool in the direction to increase the output hydraulic pressure by the pressure receiving reaction force, and the axial center part of the other end surface of the spool Is provided slidably on the other end, the end of the protruding side thereof abuts the stopper, and the other end face receives the output hydraulic pressure, so that the reaction force pushes back the spool in the direction to reduce the output hydraulic pressure by the pressure receiving reaction force. A piston and a plunger portion are provided on the outer periphery of one end surface of the spool on which the pilot piston is provided with at least axial movement thereof being restricted, and the spool is pulled back in a direction to reduce the output hydraulic pressure by suction force. A pressure reducing solenoid, and a master cylinder hydraulic pressure connecting portion for supplying a master cylinder hydraulic pressure to the other end surface of the pilot piston is formed on an outer peripheral portion of a valve body provided with a spool. Hydraulic control valve.