JP2002362352A - Brake fluid pressure generator for vehicles - Google Patents

Abstract

(57) [Problem] When a hydraulic pressure source fails, a pressure chamber communicates with a reservoir, a master cylinder piston is mechanically operated by a brake operating member, and a hydraulic pressure of the hydraulic pressure source is zero. , The hydraulic pressure is accumulated in the hydraulic pressure source even when the brake operating member is operated and the ignition switch is turned on. SOLUTION: A hydraulic pressure source 1 for generating and outputting a predetermined hydraulic pressure regardless of a brake operation on a brake pedal 111.
A switching valve 135 is interposed in a hydraulic pressure path 119 for guiding the output hydraulic pressure of No. 12 to the pressure regulating valve 115. The switching valve 135 is connected to the hydraulic pressure source 1
In response to the output hydraulic pressure of the hydraulic pressure source 12 being lower than the first predetermined hydraulic pressure value, the hydraulic pressure source 112 is shut off from the pressure regulating valve 135 and the pressure regulating valve 135 is connected to the reservoir 113. Is greater than or equal to the first predetermined hydraulic pressure value and less than the second predetermined hydraulic pressure value, the hydraulic pressure source 112 is communicated with the pressure regulating valve 115, and the pressure regulating valve 115 is shut off from the reservoir 113. When the output hydraulic pressure is equal to or higher than the second predetermined hydraulic pressure value, the hydraulic pressure source 112 is connected to the pressure regulating valve 115 and the hydraulic pressure source 112 is connected to the reservoir 113.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for generating brake fluid pressure for a vehicle.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No. 3-45458 discloses a boost chamber (pressure chamber) between a booster main body and a rear surface of a master cylinder piston of a master cylinder which is accommodated in the booster main body so as to be able to move back and forth. A control piston that is configured and abuts on the master cylinder piston at a predetermined forward position, and a valve that is accommodated in the control piston so as to be able to move back and forth, communicates the front surface with the boost chamber, and abuts on the control piston at a predetermined forward position A reaction force chamber is defined between the piston and the control piston, which is also movable back and forth, and is connected to the brake operating member to define a reaction force chamber between the piston and the rear surface of the valve piston. A force piston,
A stroke accumulator that connects the pressure accumulating chamber to the reaction chamber and a control piston and a valve piston that intervene in the flow path between the boost chamber and the hydraulic pressure source. The valve closes when the valve piston is retracted and opens when the valve piston advances. A flow connecting the inlet valve and the control piston and the valve piston so as to intervene in the flow path between the boost chamber and the hydraulic fluid tank, and closing the outlet valve when the valve piston advances, and the flow connecting the boost chamber and the hydraulic fluid tank. An emergency control valve interposed in a road and having an emergency control valve that allows the hydraulic fluid to flow out of the boost chamber when the pressure of the hydraulic pressure source falls below a predetermined value (when the hydraulic pressure source fails). A pressure booster is described.

[0003] The hydraulic pressure source includes an accumulator, a hydraulic pump driven by an electric motor to pump the liquid in the liquid tank to the accumulator, and an electric motor in response to the pressure of the accumulator when an ignition switch of the vehicle is on. And an accumulator control device for operating / stopping the operation.

In this hydraulic booster, when the reaction piston is advanced by the brake operating member, the hydraulic pressure of the hydraulic pressure source is supplied to the boost chamber in accordance with the advance, whereby the master cylinder is boosted. Can be activated. That is, the force of the stroke accumulator generated in the reaction force chamber in response to the advancement of the reaction force piston presses the valve piston in the forward direction, and the force of the hydraulic pressure in the boost chamber pushes the valve piston in the reverse direction. A valve piston opens and closes the inlet and outlet valves in a balanced manner to control the pressure in the boost chamber.

If the hydraulic pressure source fails, the reaction force piston is advanced by the brake operating member,
The valve piston and the control piston come into contact with each other sequentially, and move forward as one unit. Moreover, since the emergency control valve loses the closing force due to the hydraulic pressure of the hydraulic pressure source, the pressure in the boost chamber is released to the working fluid tank via the emergency control valve. Therefore, the control piston can abut the master cylinder piston immediately after the forward movement to mechanically operate it. That is, although the control piston and the master cylinder piston have different diameters, the movement of the control piston can be directly transmitted to the master cylinder piston without being disturbed by the hydraulic pressure in the boost chamber.

[0006]

However, in the above-mentioned conventional apparatus, the inlet valve and the outlet valve have a so-called spool valve structure, which has an advantage that input-output characteristics are smoother than that of a so-called poppet valve structure. However, leakage of the hydraulic fluid from the sliding part is inevitable. Therefore, when the vehicle is not used for a long time, the hydraulic pressure of the hydraulic pressure source decreases to zero, and the emergency control valve communicates the boost chamber with the hydraulic fluid tank. When using the vehicle from this state, the ignition switch is turned on while the brake operating member is operated. In the hydraulic pressure source, the hydraulic pump is driven by the electric motor, and the hydraulic fluid in the hydraulic fluid tank is pumped to the accumulator. The hydraulic fluid pumped to the accumulator flows into the boost chamber through an inlet valve that is open in response to the operation of the brake operating member. The hydraulic fluid flowing from the valve into the boost chamber returns to the hydraulic fluid tank. In short, even when the brake operating member is operated and the ignition switch is turned on to use the vehicle from the state where the hydraulic pressure of the hydraulic pressure source is zero, the hydraulic pressure is not accumulated in the hydraulic pressure source. Therefore, only the same brake fluid pressure as that at the time of the failure of the fluid pressure source can be generated.

In the invention according to claim 1 of the present application, when the hydraulic pressure source fails, the pressure chamber (boost chamber) communicates with the reservoir (hydraulic fluid tank) and the master cylinder piston is operated mechanically by the brake operating member. It is another object of the present invention to provide a configuration in which the hydraulic pressure is accumulated in the hydraulic pressure source even when the brake operating member is operated and the ignition switch is turned on when the hydraulic pressure of the hydraulic pressure source is zero.

In the invention according to claim 2 of the present application, when the hydraulic pressure source fails, the pressure chamber (boost chamber) communicates with the reservoir (hydraulic fluid tank) and the master cylinder piston is operated mechanically by the brake operating member. When the brake operation member is operated from the state where the hydraulic pressure of the hydraulic pressure source is zero and the ignition switch is turned on, the hydraulic pressure is stored in the hydraulic pressure source. The aim is to make it cheaper by reducing it.

[0009]

The invention according to claim 1 of the present application provides a hydraulic pressure source for generating and outputting a predetermined hydraulic pressure irrespective of a brake operation on a brake operating member, and an output of the hydraulic pressure source. A pressure chamber is formed between a manually operated piston that is slid forward by a force transmitted from the brake operating member in response to a hydraulic pressure failure and a manual operating piston that is located in front of the manual piston. A master cylinder pressure chamber is formed in front of the piston and the master cylinder piston is slid forward by the hydraulic pressure of the pressure chamber or the manually operated piston, and is supplied from the hydraulic pressure source located in the manually operated piston. A pressure control valve for reducing the hydraulic pressure to a hydraulic pressure corresponding to the force transmitted from the brake operating member to the valve member and outputting the hydraulic pressure to the pressure chamber. In the rake hydraulic pressure generating device, a first opening / closing valve that opens a passage communicating the pressure chamber and a reservoir in response to a failure of the output hydraulic pressure of the hydraulic pressure source, and adjusting the output hydraulic pressure of the hydraulic pressure source to The output hydraulic pressure of the hydraulic pressure source interposed in the hydraulic pressure passage leading to the pressure regulating valve is equal to or less than a predetermined hydraulic pressure value higher than the output hydraulic pressure value of the hydraulic pressure source when the first on-off valve is opened. A brake fluid pressure generating device for a vehicle, comprising: a second on-off valve that shuts off the fluid pressure source from the pressure regulating valve in response to a decrease.

[0010] In the vehicle brake hydraulic pressure generating device configured as described above, when the hydraulic pressure source is normal (a state in which a predetermined range of hydraulic pressure is accumulated in the hydraulic pressure source), the first on-off valve is opened. Is closed and the second on-off valve is opened, and in the pressure chamber between the manually operated piston and the master cylinder piston, a hydraulic pressure according to the operating force applied to the brake operating member is supplied by the pressure regulating valve to the manually operated piston and the master cylinder. The hydraulic pressure is supplied to the pressure chamber between the piston and the hydraulic pressure, whereby the manually operated piston is held at the return position, and the master cylinder piston is slid forward to generate brake hydraulic pressure in the master cylinder pressure chamber.

When the hydraulic pressure source fails, the first opening / closing valve is opened, the pressure chamber between the manually operated piston and the master cylinder piston communicates with the reservoir, and the manually operated piston is moved forward by operating the brake operating member. The master cylinder piston slides and comes into contact with the master cylinder piston, and the master cylinder piston slides forward to generate brake fluid pressure in the master cylinder pressure chamber.

When the brake operating member is operated and the ignition switch is turned on from a state where the hydraulic pressure of the hydraulic pressure source is zero, the first opening / closing is performed in response to the fact that the hydraulic pressure of the hydraulic pressure source is zero. The valve opens and the pressure chamber between the manually operated piston and the master cylinder piston communicates with the reservoir, but the second on-off valve is closed and the hydraulic pressure source is shut off from the pressure regulating valve. The working fluid pumped from the reservoir to the accumulator by the operation of the pump is prevented from flowing back to the reservoir through the pressure regulating valve and the pressure chamber, the pressure is accumulated in the fluid pressure source, and the first pressure is increased by the increase in the output fluid pressure of the fluid pressure source. When the output hydraulic pressure of the hydraulic pressure source becomes higher than a predetermined hydraulic pressure value, the second open / close valve opens, and the brake hydraulic pressure is applied to the master cylinder pressure chamber in the same manner as when the hydraulic pressure source is normal. Is generated.

The invention according to claim 2 of the present application is directed to a hydraulic pressure source for generating and outputting a predetermined hydraulic pressure irrespective of a brake operation on a brake operating member, and to a failure of the output hydraulic pressure of the hydraulic pressure source. A manually operated piston slid forward by a force transmitted from the brake operating member, and a pressure chamber formed between the manually operated piston and a manual cylinder located in front of the manual piston. A master cylinder piston which forms a pressure chamber and is slid forward by the hydraulic pressure of the pressure chamber or the manually operated piston, and a brake which is provided in the manually operated piston and supplied by the hydraulic pressure source to the brake; Generating a brake fluid pressure for a vehicle, comprising: a pressure regulating valve that reduces the pressure to a fluid pressure corresponding to the force transmitted from the operating member to the valve member and outputs the fluid pressure to the pressure chamber In the arrangement, a valve switching valve is interposed in a hydraulic passage for guiding the output hydraulic pressure of the hydraulic pressure source to the pressure regulating valve, and the switching valve controls the output hydraulic pressure of the hydraulic pressure source to a first predetermined hydraulic pressure. Occupies the first position in response to the pressure value being less than the pressure value, and to the second position in response to the output hydraulic pressure of the hydraulic pressure source being equal to or higher than the first predetermined hydraulic pressure value and lower than the second predetermined hydraulic pressure value. And occupies a third position in response to the output hydraulic pressure of the hydraulic pressure source being equal to or higher than a second predetermined hydraulic pressure value. In the first position, the hydraulic pressure source is moved from the pressure regulating valve to the third position. Shut off and communicate the pressure regulating valve to the reservoir, in a second position thereof communicate the hydraulic pressure source to the pressure regulating valve and shut off the pressure regulating valve from the reservoir; A pressure source connected to the pressure regulating valve and a fluid pressure source connected to the reservoir. A brake pressure generating apparatus for a vehicle.

The first predetermined hydraulic pressure value is a normal lower limit value of the output hydraulic pressure of the hydraulic pressure source. Further, the second predetermined hydraulic pressure value is an upper limit of the allowable hydraulic pressure of the hydraulic circuit.

In the vehicle brake hydraulic pressure generating device configured as described above, when the hydraulic pressure source is normal, the switching valve occupies the second position to connect the hydraulic pressure source to the pressure regulating valve and to connect the pressure regulating valve to the reservoir. The pressure chamber between the manually operated piston and the master cylinder piston is supplied with hydraulic pressure according to the operating force applied to the brake operating member by a pressure regulating valve, and the hydraulic pressure causes the manually operated piston to return to the return position. And the master cylinder piston is slid forward to generate brake fluid pressure in the master cylinder pressure chamber.

When the hydraulic pressure source fails, the switching valve occupies the first position, shuts off the hydraulic pressure source from the pressure regulating valve, communicates the pressure regulating valve with the reservoir, and operates manually when the brake operating member is operated. The pressure chamber between the piston and the master cylinder piston communicates with the reservoir through the pressure regulating valve and the switching valve in sequence, and the manually operated piston slides forward by the operation of the brake operating member, and abuts on the master cylinder piston to cause the master cylinder to move. The piston slides forward to generate brake fluid pressure in the master cylinder pressure chamber.

When the brake operating member is operated and the ignition switch is turned on from the state where the hydraulic pressure of the hydraulic pressure source is zero, the switching valve is turned on in response to the hydraulic pressure of the hydraulic pressure source being zero. Since the hydraulic pressure source occupies the position 1 and is shut off from the pressure regulating valve, the operation of the hydraulic pump of the hydraulic pressure source prevents the hydraulic fluid pumped from the reservoir to the accumulator from being returned to the reservoir. When the pressure is accumulated and the output hydraulic pressure of the hydraulic pressure source reaches a second predetermined value or more, the switching valve switches to the second position, so that the brake is applied to the master cylinder pressure chamber in the same manner as when the hydraulic pressure source is normal. Hydraulic pressure is generated.

Further, when the output hydraulic pressure of the hydraulic pressure source is equal to or higher than the second predetermined hydraulic pressure value, the switching valve occupies the third position to connect the hydraulic pressure source to the pressure regulating valve and to connect the hydraulic pressure source to the reservoir. I do.
This is a so-called relief valve function, in which an increase in the output hydraulic pressure of the hydraulic pressure source is limited to a second predetermined hydraulic pressure value.

The switching valve fulfills the function of the first on-off valve and the second on-off valve and also fulfills the function of a relief valve normally installed in a hydraulically operated device.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a brake fluid pressure generating device 1 for a vehicle according to an embodiment of the present invention.
FIG. 2 is a diagram showing the overall configuration of a 0. As shown in FIG. 1, the vehicle brake hydraulic pressure generating device 10 is configured to depress a brake pedal 11, which is a brake operation member, when the ignition switch (not shown) of the vehicle is in an ON state, that is, the brake operation member A hydraulic pressure source 12 is provided for generating and outputting a predetermined hydraulic pressure P1 irrespective of a brake operation. The hydraulic pressure source 12 includes an accumulator 12a for accumulating hydraulic fluid in a pressurized state, a pressure sensor 12b for detecting a hydraulic pressure accumulated in the accumulator 12a and outputting the hydraulic pressure to an electric control device 12c, Motor 12d driven by the dynamic control device 12c in accordance with the detection output of the pressure sensor 12b, and a hydraulic pump 12e driven by the DC motor 12d to pump the hydraulic fluid in the reservoir 13 to the accumulator 12a. The hydraulic pressure of the accumulator 12a is maintained between a predetermined upper limit and a lower limit. Although not shown,
A relief valve for defining an allowable upper limit of the output hydraulic pressure of the hydraulic pressure source 12 is provided.

The hydraulic pressure output by the hydraulic pressure source 12 is
To the inlet 14a of the fixed cylinder 14 via the The cylinder 14 has an inlet 14a, a return port 14b, a communication port 14c, and two brake fluid pressure output ports 14c.
d and 14e. The cylinder 14 has a rear side portion (FIG. 1).
The right side portion has a large diameter and the front side portion (the left side portion in FIG. 1) has a stepped inner hole with a small diameter. A manually operated piston 16 also serving as a body is provided slidably with respect to the cylinder 14 in a liquid-tight manner.

The rear end of the manually operated piston 16 is
It has a small diameter, and penetrates the rear end wall of the cylinder 14 in a liquid-tight and slidable manner and protrudes rearward of the cylinder 14. In the small-diameter portion of the stepped bore, a first master cylinder piston 17 located in front of the manually operated piston 16 and a second master cylinder piston 18 located in front of the master cylinder piston 17 are cylinders, respectively. 14, it is installed so as to be liquid-tight and slidable. The first master cylinder pressure chamber 19 formed between the master cylinder pistons 17 and 18 is connected to a wheel cylinder 21 via a brake hydraulic pressure output port 14 d and a hydraulic pressure path 20.
Connected to In addition, the second master cylinder piston 1
The second master cylinder pressure chamber 22 formed between the pressure chamber 8 and the front end wall of the cylinder 14 has a brake hydraulic pressure output port 14e.
And a hydraulic cylinder 23 and a wheel cylinder 24. Springs 25, 26 for returning the master cylinder pistons 17, 18 to the return position shown in FIG. 1 are provided in the master cylinder pressure chambers 19, 22. When the master cylinder pistons 17 and 18 occupy the return position in FIG. 1, the master cylinder pressure chamber 19 communicates with the reservoir 13 via the hole 17a of the master cylinder piston 17 and the hole 14f of the cylinder, and the master cylinder pressure chamber 22 Hole 18a of master cylinder piston 18 and hole 1 of cylinder
It communicates with the reservoir 13 via 4 g. When the first master cylinder piston 17 is slid forward from the return position, the second master cylinder piston 18 is slid forward from the return position via the spring 25, and the master cylinder pressure chambers 19 and 22 are stored in the reservoirs. The brake fluid is shut off from the brake cylinder 13 and brake fluid pressure is generated in the master cylinder pressure chambers 19 and 22 and output to the wheel cylinders 21 and 24.

In the manually operated piston 16, an input member 27 interlocked with the brake pedal 11 and the pressure regulating valve 15 are coaxially installed. The pressure regulating valve 15 has a so-called spool valve structure including a valve spool (valve member) 15a slidably fitted in the inner hole of the manually operated piston 16 and a coil spring 15b for returning the valve spool 15a to the right. Things. The rear end of the valve spool 15a is located in the return chamber 32 where the input member 27 is located. In the return chamber 32, the hole 16b of the manually operated piston 16 and the cylinder 14 are always in communication with the reservoir 13 via the return port 14b. An output hydraulic chamber 15c formed by the valve spool 15a in the return manual operation piston 16 is formed between the manual operation piston 16 and the first master cylinder piston 21 through the hole 16a of the manual operation piston 16. The pressure chamber 28 is always in communication. The pressure chamber 28 is connected to the reservoir 13 through the communication port 14c and the hydraulic path 29.

In the return chamber 32, between the retainer 30 supported by the rear end of the valve spool 15a and the input member 27, when the brake pedal 11 is depressed, the input member 2
A compressible coil spring 31 is provided for transmitting a brake operation force applied to the input member 27 to the valve spool 15a while providing a stroke to the brake pedal 7 and the brake pedal 11. The mounting load of the coil spring 31 is smaller than the mounting load of the coil spring 15b.

The state where the valve spool 15a of the pressure regulating valve 15 is located at the position shown in FIG. 1 is a state where the output of the pressure regulating valve 15 is reduced, and the output hydraulic pressure chamber 15c is shut off from the inlet 14a and communicates with the return chamber 32. . The state in which the valve spool 15a slides leftward from the position shown in the drawing by a predetermined amount is the output holding state of the pressure regulating valve 15, and the output hydraulic chamber 15c is shut off from both the inlet 14a and the low-pressure chamber 32. The state in which the valve spool 15a slides to the left from the position where the output is held is a state in which the output of the pressure regulating valve 15 is increased, and the output hydraulic chamber 15c is disconnected from the low-pressure chamber 32 and communicates with the inlet 14a.

A hydraulic passage 29 connecting the pressure chamber 28 between the manually operated piston 16 and the master cylinder piston 17 to the reservoir 13 is provided with an on-off valve 33 responsive to the output hydraulic pressure of the hydraulic pressure source 12. You. The hydraulic pressure path 36 for guiding the output hydraulic pressure of the hydraulic pressure source 12 to the pressure regulating valve 15 is connected to the hydraulic pressure source 12.
An opening / closing valve 34 responsive to the output hydraulic pressure is interposed. The on-off valve 33 closes when the output hydraulic pressure of the hydraulic pressure source 12 exceeds a first predetermined hydraulic pressure value (set to substantially zero), and the output hydraulic pressure of the hydraulic pressure It is configured to open in response to a drop below a predetermined hydraulic pressure value of 1. On-off valve 34
Is opened in response to the output hydraulic pressure of the hydraulic pressure source 12 exceeding a second predetermined value higher than the first predetermined hydraulic pressure value, and the output hydraulic pressure of the hydraulic pressure source 12 is increased to a second predetermined hydraulic pressure. It is configured to be closed in response to a drop below the hydraulic pressure value. Each of the on-off valves 33 and 34 is operated by an output hydraulic pressure of the hydraulic pressure source 12 and a spring opposing the output hydraulic pressure.

FIG. 1 shows a state in which the hydraulic pressure generating device 12 is in a normal state and the brake pedal 11 is not depressed, the pressure regulating valve 16 is in an output decreasing state, and the hydraulic pressure of the wheel cylinder 18 is in a state. Is the lowest. And
The on-off valve 33 is closed, the pressure chamber 28 is shut off from the reservoir 13, and the on-off valve 34 is opened, so that the output hydraulic pressure of the hydraulic pressure source 12 is supplied to the pressure regulating valve 12.

When the brake pedal 11 is depressed in the state shown in FIG. 1, the pressure regulating valve 15 applies the hydraulic pressure supplied from the hydraulic pressure generating device 12 to the coil spring 3 from the input member 27.
The pressure is adjusted to a hydraulic pressure corresponding to the force applied to the valve spool 15a via the control valve 1 and output. The output hydraulic pressure of the pressure regulating valve 15 is
The master cylinder pistons 17 and 18 are slid forward by pressure increase in the pressure chamber 28, and brake fluid pressure corresponding to the fluid pressure in the pressure chamber 28 is generated in the master cylinder pressure chambers 19 and 22. Wheel cylinder 21, 2
4 are supplied. During this time, the valve spool 15a is urged rearward by a force corresponding to the hydraulic pressure of the output hydraulic pressure chamber 15c (the hydraulic pressure of the pressure chamber 28), and this urging force is transmitted to the brake pedal 11 as a reaction force. Also, a manually operated piston 1
6 is held at the return position shown in FIG. 1 by the hydraulic pressure of the pressure chamber 28.

When the output hydraulic pressure of the hydraulic pressure generator 12 has failed, the on-off valve 33 is opened, and the pressure chamber 28 communicates with the reservoir. When the brake pedal 11 is depressed, the input member 27 abuts on the manually operated piston 16 via the retainer 30 to slide the manually operated piston 16 forward. This allows the manually operated piston 16
Abuts on the master cylinder piston 17 to slide the master cylinder pistons 17, 18 forward. Therefore,
A brake fluid pressure is generated in the master cylinder pressure chambers 19 and 22 according to the brake operation force, and the wheel cylinder 2
1, 24.

When the brake pedal 11 is depressed and the ignition switch is turned on from a state where the hydraulic pressure of the hydraulic pressure source 12 is zero, the on-off valve 33 opens in response to the hydraulic pressure of the hydraulic pressure source 12 being zero. The pressure chamber 28 is the reservoir 13
However, since the on-off valve 34 is closed and the hydraulic pressure source 12 is shut off from the pressure regulating valve 15, the hydraulic pump 12 of the hydraulic pressure source 12
e from the reservoir 13 to the accumulator 12
a is prevented from flowing back to the reservoir 13 through the pressure regulating valve 15 and the pressure chamber 28, the pressure is accumulated in the hydraulic pressure source 12, and the output hydraulic pressure of the hydraulic pressure source 12 is reduced to the first predetermined hydraulic pressure. When the pressure becomes higher than the pressure value, the on-off valve 33 closes and the hydraulic pressure source 1
When the output hydraulic pressure of the hydraulic pressure source 2 becomes higher than the second predetermined hydraulic pressure value, the on-off valve 34 is opened, so that the brake hydraulic pressure is generated in the master cylinder pressure chambers 19 and 22 in the same manner as when the hydraulic pressure source 12 is normal. You.

FIG. 2 is a diagram showing the overall configuration of a vehicle brake hydraulic pressure generator 110 according to an embodiment of the present invention. The vehicle brake hydraulic pressure generating device 110 differs from the vehicle brake hydraulic pressure generating device 10 of FIG. 1 only in that a switching valve 135 is provided instead of providing the open / close valves 33 and 34. Different. Therefore, this point will be described, and the description of the other portions will correspond to the reference numerals obtained by adding 100 to the reference numerals used in the description of the vehicle brake hydraulic pressure generation device 10 to the components of the vehicle brake hydraulic pressure generation device 10. The description is omitted by attaching to the components.

The switching valve 135 is interposed in a hydraulic passage 136 for guiding the output hydraulic pressure of the hydraulic pressure source 112 to the pressure regulating valve 115.
As shown in FIGS. 2 to 5, a housing having an inlet 135e communicating with the output side of the hydraulic pressure source 112, an outlet 135f communicating with the input side of the pressure regulating valve 115, and a return port 135g communicating with the reservoir 113. 135a, a valve body 135b installed in the housing 135a, a valve spool 135c slidably fitted in an inner hole of the valve body 135b, and the valve spool 135c shown in FIGS.
And a spring 135d for urging rightward.

When the output hydraulic pressure of the hydraulic pressure source 112 for generating the urging force for urging the valve spool 135c to the left in FIGS. 3 to 5 is lower than the first predetermined hydraulic pressure value, the valve spool 135c is moved to the position shown in FIG. Occupies the first position shown in FIG. In FIG. 3, the entrance 135e is shut off from the exit 135f and the exit 13e is closed.
5f is communicated with the return port 135g. In other words, at the first position, the fluid pressure source 112 is shut off from the pressure regulating valve 115 and the pressure regulating valve 115 is connected to the reservoir 113.

When the output hydraulic pressure of the hydraulic pressure source 112 is equal to or higher than the first predetermined hydraulic pressure value and lower than the second predetermined hydraulic pressure value, the valve spool 135c occupies the second position shown in FIG. In FIG. 4, the entrance 135e communicates with the exit 135f, and the exit 135f is shut off from the return 135g. In other words, in the second position, the hydraulic pressure source 112 is
15 and shuts off the pressure regulating valve 115 from the reservoir 113.

When the output hydraulic pressure of the hydraulic pressure source 112 is equal to or higher than the second predetermined hydraulic pressure value, the valve spool 135c occupies the third position shown in FIG. In FIG. 5, the entrance 135e communicates with the exit 135f, and the entrance 135e communicates with the return 135g. In other words, at the third position, the hydraulic pressure source 112 communicates with the pressure regulating valve 115 and the hydraulic pressure source 112 communicates with the reservoir 113.

Here, the first predetermined hydraulic pressure value corresponds to the hydraulic pressure source 11
This is the normal lower limit value of the output hydraulic pressure of 2. Further, the second predetermined hydraulic pressure value is an upper limit value of an allowable hydraulic pressure of a hydraulic passage from the hydraulic pump 112e to the pressure regulating valve 115.

When the hydraulic pressure source 112 is normal, the switching valve 135
Occupies the second position, connects the hydraulic pressure source 112 to the pressure regulating valve 115, disconnects the pressure regulating valve 115 from the reservoir 113, and has a brake pedal in the pressure chamber 128 between the manually operated piston 116 and the master cylinder piston 117. The hydraulic pressure according to the operating force applied to the pressure control valve 111
The hydraulic pressure holds the manually operated piston 116 at the return position, and the master cylinder pistons 117 and 118 slide forward to generate brake hydraulic pressure in the master cylinder pressure chambers 119 and 122.

When the hydraulic pressure source 112 fails, the switching valve 135
Occupies the first position, shuts off the hydraulic pressure source 112 from the pressure regulating valve 115, connects the pressure regulating valve 115 to the reservoir 113, and operates the manual operation piston 116 and the master cylinder piston 11 when the brake pedal 111 is operated.
7 is provided with a pressure regulating valve 115 and a switching valve 135.
Are sequentially communicated with the reservoir 113 via the manually operated piston 11 by operating the brake pedal 111.
6 is slid forward and abuts against the master cylinder piston 117, and the master cylinder pistons 117 and 118 are slid forward to generate brake hydraulic pressure in the master cylinder pressure chambers 119 and 122.

When the brake pedal 111 is operated and the ignition switch is turned on while the hydraulic pressure of the hydraulic pressure source 112 is zero, the switching valve is switched in response to the fact that the hydraulic pressure of the hydraulic pressure source 112 is zero. 135 occupies the first position and shuts off the hydraulic pressure source 112 from the pressure regulating valve 115.
13 is prevented from being returned to the reservoir 113 by the hydraulic pressure supplied to the accumulator 112a.
When the output pressure of the hydraulic pressure source 112 reaches a first predetermined value or more, the switching valve 135 switches to the second position. Brake fluid pressure is generated in the cylinder pressure chambers 119 and 122.

Further, when the output hydraulic pressure of the hydraulic pressure source 112 is equal to or higher than the second predetermined hydraulic pressure value, the switching valve 135 occupies the third position to connect the hydraulic pressure source 112 to the pressure regulating valve 115 and to control the hydraulic pressure source. 112 is connected to the reservoir 113. This is a so-called relief valve function, and an increase in the output hydraulic pressure of the hydraulic pressure source 112 is limited to a second predetermined hydraulic pressure value.

[0041]

As is apparent from the above description, in the vehicle brake hydraulic pressure generating device according to the first aspect of the present invention, when the hydraulic pressure source fails, the pressure chamber communicates with the reservoir and the brake operating member is opened. As a result, the master cylinder piston is mechanically operated, and the hydraulic pressure is accumulated in the hydraulic pressure source even when the brake operating member is operated and the ignition switch is turned on from a state where the hydraulic pressure of the hydraulic pressure source is zero. Therefore, when the brake operating member is operated and the ignition switch is turned on from the state where the hydraulic pressure of the hydraulic pressure source is zero, the brake hydraulic pressure can be generated as in the normal state.

Further, in the vehicle brake hydraulic pressure generating device according to claim 2 of the present application, when the hydraulic pressure source fails, the pressure chamber (boost chamber) communicates with the reservoir (hydraulic fluid tank) to operate the brake. The master cylinder piston is mechanically operated by the member, and the hydraulic pressure is accumulated in the hydraulic pressure source even when the brake operating member is operated and the ignition switch is turned on from a state where the hydraulic pressure of the hydraulic pressure source is zero. With this configuration, when the brake operating member is operated from the state where the hydraulic pressure of the hydraulic pressure source is zero and the ignition switch is turned on, the brake hydraulic pressure can be generated in the same manner as in normal operation. The number of constituent members can be reduced and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a vehicle brake hydraulic pressure generating device according to an embodiment of the present invention according to claim 1 of the present application.

FIG. 2 is a diagram showing an overall configuration of a vehicle brake hydraulic pressure generating device according to an embodiment of the invention as set forth in claim 2 of the present application;

FIG. 3 is a diagram showing a configuration and an operation of a switching valve in FIG. 2;

FIG. 4 is a view showing the configuration and operation of a switching valve in FIG. 2;

FIG. 5 is a view showing the configuration and operation of the switching valve in FIG. 2;

[Explanation of symbols]

 10, 110 ··· Vehicle pressure brake fluid pressure generator 11, 111 ··· Brake pedal 12, 112 ··· Hydraulic pressure source 15, 115 ··· Pressure regulating valve 15a, 115a ··· Valve spool (valve element) 16, 116: manually operated piston 17, 117: master cylinder piston 19, 119: master cylinder pressure chamber 28, 128: pressure chamber 33, 34: open / close valve 135: switching valve 29, 36, 136 ... hydraulic passage

Claims (2)

[Claims] 1. A hydraulic pressure source for generating and outputting a predetermined hydraulic pressure irrespective of a brake operation on a brake operating member, and transmitted from the brake operating member in response to a failure in the output hydraulic pressure of the hydraulic pressure source. A manually operated piston that is slid forward by a force applied thereto, and a pressure chamber formed between the manually operated piston and the manual operated piston located in front of the manual piston. A master cylinder piston slid forward by the hydraulic pressure or the manually operated piston, and a hydraulic pressure located in the manually operated piston and supplied from the hydraulic pressure source is transmitted from the brake operating member to the valve member. And a pressure regulating valve for reducing the pressure to a fluid pressure according to the force and outputting the fluid pressure to the pressure chamber.
A first on-off valve for opening a passage connecting the pressure chamber and the reservoir in response to a failure of the output hydraulic pressure of the hydraulic pressure source, and a hydraulic pressure passage for guiding the output hydraulic pressure of the hydraulic pressure source to the pressure regulating valve In response to the output hydraulic pressure of the hydraulic pressure source being interposed at a predetermined hydraulic pressure value lower than the hydraulic pressure output value of the hydraulic pressure source when the first on-off valve is opened, A vehicle brake hydraulic pressure generator, comprising: a second on-off valve that shuts off a hydraulic pressure source from the pressure regulating valve. 2. A hydraulic pressure source for generating and outputting a predetermined hydraulic pressure irrespective of a brake operation on a brake operating member, and transmitted from the brake operating member in response to a failure in output hydraulic pressure of the hydraulic pressure source. A manually operated piston that is slid forward by a force applied thereto, and a pressure chamber formed between the manually operated piston and the manual operated piston located in front of the manual piston. A master cylinder piston slid forward by the hydraulic pressure or the manually operated piston, and a hydraulic pressure located in the manually operated piston and supplied from the hydraulic pressure source is transmitted from the brake operating member to the valve member. And a pressure regulating valve for reducing the pressure to a fluid pressure according to the force and outputting the fluid pressure to the pressure chamber.
A valve switching valve is interposed in a hydraulic passage for guiding the output hydraulic pressure of the hydraulic pressure source to the pressure regulating valve, and the switching valve has an output hydraulic pressure of the hydraulic pressure source lower than a first predetermined hydraulic pressure value. The first according to
And occupies a second position in response to the output hydraulic pressure of the hydraulic pressure source being equal to or higher than a first predetermined hydraulic pressure value and lower than a second predetermined hydraulic pressure value. The third position is occupied in response to the hydraulic pressure being equal to or higher than a second predetermined hydraulic pressure value. In the first position, the hydraulic pressure source is shut off from the pressure regulating valve and the pressure regulating valve is connected to the reservoir. In the second position, the fluid pressure source is communicated with the pressure regulating valve and the pressure regulating valve is disconnected from the reservoir. In the third position, the fluid pressure source is communicated with the pressure regulating valve and the fluid pressure source is communicated with the fluid pressure source. A brake fluid pressure generating device for a vehicle, wherein a pressure source is connected to the reservoir.