JPH06104440B2 - Pressure regulator for vehicle braking system - Google Patents

Description

The present invention relates to a pressure regulator for a vehicle braking system, and
The present invention relates to a pressure regulator that generates and supplies a predetermined multiple of the pressure generated in a vehicle master cylinder to a vehicle wheel cylinder.

[Conventional technology]

Conventionally, a pressure regulator as disclosed in, for example, JP-A-56-90760 is known.

In this publication, the hydraulic pressure generated in the master cylinder is transmitted to the brake cylinder (wheel cylinder) via the modulator valve. The modulator valve cuts off the communication between the brake cylinder and the master cylinder in response to a signal from the control unit, and connects the reservoir and the brake cylinder to reduce the hydraulic pressure in the brake cylinder. When pressurizing again, the hydraulic pressure of the accumulator is used, and the pressure regulator reduces this pressure according to the pressure of the master cylinder and transmits it to the modulator valve. Then, hydraulic pressure is supplied from the modulator valve to the brake cylinder.

[Problems to be solved by the invention]

However, the pressure regulator disclosed in the above publication adjusts the accumulator pressure so that the hydraulic pressure higher than the master cylinder pressure is not applied to the brake cylinder, and the output pressure ratio to the master cylinder pressure is 1 or less. That is, there was no pressure amplification action of the master cylinder pressure.

Further, the output pressure ratio is fixed uniformly for all wheels, and it has not been possible to independently supply hydraulic pressure to each wheel.

In view of the above problems, it is an object of the present invention to obtain a pressure regulator for a vehicle braking device that has a simple structure and amplifies the master cylinder pressure to an arbitrary multiple and adjusts it to an appropriate pressure.

[Means for solving problems]

In order to achieve the above object, the present invention cuts off communication by sliding a pressure source that supplies pressure to a vehicle braking device and a supply passage from the pressure source to a vehicle wheel cylinder in the axial direction. An on-off valve and a coil that applies a moving force in the axial direction of the on-off valve are provided, and the on-off valve has a master cylinder pressure receiving surface that receives pressure from a vehicle master cylinder, and the master cylinder pressure receiving surface that faces each other. Then, it has a wheel cylinder pressure receiving surface for receiving pressure from the vehicle wheel cylinder, and the master cylinder pressure receiving surface is set to have an area larger by a predetermined amount than the wheel cylinder pressure receiving surface,
A technique for adjusting the pressure to the vehicle wheel cylinder by adjusting the sliding amount of the opening / closing valve based on the pressure on the master cylinder pressure receiving surface, the pressure on the wheel cylinder pressure receiving surface, and the amount of current to the coil. The means is adopted.

[Action]

According to the present invention, the opening / closing valve for opening / closing the pressure supply passage to the vehicle wheel cylinder receives the pressure from the vehicle wheel cylinder in opposition to the pressure from the vehicle master cylinder. Furthermore, since the master cylinder pressure receiving surface is set to have an area that is larger than the master cylinder pressure receiving surface by a predetermined amount, the pressure on the wheel cylinder is increased according to the area ratio, and the axial movement force of the on-off valve is further increased. By adjusting the amount of movement of the coil by applying a coil, the pressure is adjusted to any appropriate pressure on the wheel cylinder.

〔Example〕

Next, an embodiment of the present invention will be described with reference to FIG.

A first cylinder 210 and a second cylinder 212 are formed inside a casing 203 that forms the outer shape of the pressure regulator 201. The first cylinder 210 has an inner diameter larger than that of the second cylinder 212.
Inside, a movable core 218 is slidably arranged. A spring 214 and a spring 21 are provided on both end surfaces of the movable core 218.
6 are arranged, and the movable core 218 is attached to the first cylinder 21.
It is located almost in the middle of 0.

A constant pressure source 11 is provided in the second cylinder 212 via a passage 926.
1, the first port 201a communicating with 1, the second port 201b communicating with the master cylinder 103 via the passage 902, the third port 201c communicating with the reservoir 112 via the passage 928, and the wheel cylinder 113 via the passage 916. The fourth ports 201d communicating with each other are open. The second of the first port 201a
A circular groove 232 is formed at the opening end on the cylinder 212 side.
A circular groove 234 is also formed at the opening end of the third port 201c on the second cylinder 212 side.

A first spool 220 and a second spool 222 are slidably arranged in the second cylinder 212. The movable core 218 and the first spool 220 are rods, respectively.
224 are connected, and the first spool 220 and the second spool 220
The spool 222 is connected by a rod 226. The movable core 218, the rod 224, the first spool 220, the rod 226, and the second spool 222 form a spool valve 250.

When the movable core 218 is positioned at the intermediate position of the first cylinder 210 by the springs 214 and 216, the first spool 220 is in contact with the first port 201a.
The circular groove 232 is closed. At the same time, the second spool 222 closes the circular groove 234 of the third port 201c.

The second port 201b opens into a master chamber 230 formed on the front side of the second spool 222. Further, the fourth port 201d has the first spool 220 and the second spool 222 when the movable core 218 is at the intermediate position as described above.
Is opened at an intermediate position, that is, so as to face the rod 226. A back pressure chamber 228 is formed on the side surface of the rod 224 of the first spool 220. A branch port 228a, which branches from the fourth port 201d, communicates with the back pressure chamber 228.

A first coil 236 and a second coil 238 are independently arranged on the outer periphery of the movable core 218. The first coil 236 generates a magnetic force by supplying an electric current, so that the movable core 218 is sucked toward the second cylinder 212 side. Further, the second coil 238 also supplies a current to generate a magnetic force so that the movable core 218 is sucked toward the side opposite to the second cylinder 212. A rod 225 is provided on the other end surface of the movable core 218.
Is pivotally supported by the housing 203.

Next, the operation of this embodiment will be described. First coil 23
When the 6 and the second coil 238 are not energized and the brake hydraulic pressure is not introduced into the master chamber 230, the spool valve 250 maintains the position shown in FIG. That is, the first port 201a is the first spool 22
Blocked by 0, the third port 201c is the second spool 222
Is blocked by.

Next, when the driver depresses the brake pedal 101, the brake hydraulic pressure corresponding to the stepping force is applied to the master cylinder 103.
Cause. This brake hydraulic pressure passes through the passage 902,
It is introduced into the master chamber 230 from the second port 201b. When the brake hydraulic pressure is introduced into the master chamber 230, the hydraulic pressure is received by the end surface (master cylinder pressure receiving surface) on the side of the second spool 222 master chamber 230. Therefore, the spool valve 250 moves rightward (communication direction) in FIG. 1 against the biasing force of the spring 214. Then, until now, the first spool 220
The first port 201a that has been blocked by is opened, and the pressure stored in the constant hydraulic power source 111 is introduced from the first port 201a into the second cylinder 212 via the passage 926, and further the outer peripheral portion of the rod 226 is provided. Through the fourth port 201d. Thereafter, this pressure is discharged from the fourth port 201d to the passage 916.

At this time, the pressure introduced to the fourth port 201d is the branch port 22.
It is guided to the back pressure chamber 228 from 8a. And this back pressure chamber 228
The internal pressure is gradually increased.

Here, the master cylinder pressure receiving surface area of the second spool 222 is A, and the wheel cylinder pressure receiving surface area when the first spool 220 receives the pressure in the back pressure chamber 228 is B.
And Although the second spool 222 receives the pressure in the master chamber 230 over the entire end surface thereof, the first spool 2
Since 20 has a rod 224 formed on its pressure receiving surface, comparing the master cylinder pressure receiving surface area A with the wheel cylinder pressure receiving surface area B, the master cylinder pressure receiving surface area A is larger. Has become.

Now, it is assumed that a pressure of "1" is introduced into the master chamber 230 and a pressure of "1" is introduced into the back pressure chamber 228. Then, a force of 1 × A acts on the spool 222 in the right direction, and a force of 1 × B acts on the first spool 220 in the left direction. In this case, the force acting to the right and the force acting to the left correspond to the ratio of the pressure receiving areas A and B. Therefore, the spool valve 250 must move in the left direction (blocking direction) in FIG. 3 only when the pressure introduced into the back pressure chamber 228 becomes A / B times the pressure introduced into the master chamber 230. become.

Thus, when the spool valve 250 moves to the left (blocking direction), the first port 201a is closed by the first spool 220, while the third port 201c is opened by the movement of the second spool 222. Become. Then, the pressure supplied to the wheel cylinder 113 through the passage 916 will be released to the reservoir 112 from the third port 201c, and the pressure in the back pressure chamber 228 will gradually decrease. Become. Finally, the back pressure chamber 228 is kept at A / B times the pressure of the master chamber 230, and the force acting to the right and the force acting to the left become equal. Then, the spool valve 250 is returned to the state shown in FIG. 1 by the urging force of the springs 214 and 216, and the first port 201a also has the third port.
Port 201c is also the first spool 220 and the second spool 2 respectively
Blocked by 22. That is, the pressure supplied to the passage 916 is A / B times the pressure supplied to the master chamber 230.

Here, a current is supplied to the first coil 236 to draw the movable core 218 toward the second cylinder 212. that way,
The force acting on the spool 250 in the right direction (communication direction) in the drawing increases, and the spool 250 moves leftward before the pressure in the back pressure chamber 228 becomes A / B times the pressure, and Port 201a
Will be blocked. That is, this first coil 23
The pressure supplied to the passage 916 is reduced by an amount corresponding to the electric current supplied to 6.

On the other hand, a current is supplied to the second coil 238 to attract the movable core 218 in the direction opposite to the second cylinder 212. In that case, the force acting on the spool valve 250 in the right direction (blocking direction) in the drawing is increased. Therefore, the spool 250 does not move to the left until the pressure in the back pressure chamber 228 becomes higher than A / B times. Therefore, the pressure output to the passage 916 is increased to A / B times or more the pressure of the master chamber 230 and then output.

By controlling the amount of current flowing through the first coil 236 and the second coil 238 in this way, the pressure output to the passage 916 can be controlled.

The second coil 238 may be eliminated as necessary and only the first coil 236 may be provided. However, it goes without saying that if both the first and second coils 236 and 238 are arranged as in this embodiment, the pressure inside the wheel cylinder 113 can be adjusted with higher accuracy.

Further, one pressure regulator 201 of this embodiment is arranged for each wheel cylinder.

Next, a second embodiment of the present invention will be described with reference to FIG.

Inside the housing 510 forming the outer shape of the pressure regulator 501, a first input chamber 511, a cylinder 512, a first return chamber 513,
A second return chamber 514 is formed. The cylinder 512 has a first chamber 515 having the largest inner diameter and a second chamber 516 having the second largest diameter.
And a third chamber 517 having the smallest inner diameter. A spool valve 520 is arranged inside the cylinder 512. The spool 520 has a large diameter portion 521 having an outer diameter that substantially fits in the first chamber 515, a medium diameter portion 522 that substantially fits in the second chamber, and a small diameter portion having an outer shape that fits in the third chamber. With 523.

The large diameter portion 521 of the spool valve 520 has an axial length of the first diameter 521.
It is formed shorter than the axial length of the chamber 515, and when the large diameter portion 521 fits in the first chamber 515, spaces are formed on both sides of the large diameter portion 521. The spaces on both sides are communicated with each other by a communication passage 521a formed in the large-diameter portion 521.
A port 530, which communicates with the reservoir 112 via a passage 928, opens in the chamber 515. The large diameter portion is provided in the first chamber 515.
Springs 540 and 541 for urging 521 to the center from the left and right
Are arranged respectively.

A port 531 is opened in the second chamber 516, and the port 531 is connected to the master cylinder 103 via a passage 902. That is, the brake hydraulic pressure generated by the master cylinder 102 is introduced into the second chamber 516 via the passage 902.

A port 532 is opened in the first return chamber 513, and the port 532 is connected to the passage 928. Further, the first return chamber 513 and the second return chamber 514 are combined with the second check valve 55.
Communication can be cut off via 0. That is, a valve seat 551 is formed on an isolation wall that separates the first return chamber 513 and the second return chamber 514, and the ball valve 552 seated on the valve seat 551 is biased by the spring 553 so that the second return chamber 51
It is seated from 4 toward the first return chamber 513.

Communication between the third chamber 517 and the input chamber 511 is cut off by a first check valve 560. The first check valve 560 is a valve seat provided on a partition wall separating the input chamber 511 and the third chamber 517.
It consists of 561, ball 562 and spring 563. The ball 562 receives the urging force of the spring 563, and the valve seat 563 urges the ball 562 from the input chamber 511 toward the third chamber 517.

A port 534 is opened in the input chamber 511, and the port 534 is connected to the constant pressure source 111 via a passage 926. That is, the input chamber 511 is supplied with a constant hydraulic pressure from the constant pressure source 111 through the passage 926.

A port 535 is opened in the third chamber 517, and the port 535 is connected to the wheel cylinder 113 via a passage 916. A technique passage 916a is branched into the passage 916, and the technique passage 916a is connected to a port 536 opened in the second return chamber 514.

The housing 510 is made of a magnetic material, and a coil 580 is provided on the outer periphery of the first chamber 515 and the second chamber 516.
Is provided. The coil 580 generates a magnetic force when energized, and the magnetic force causes the entire spool valve 520 to be attracted toward the second chamber 516 side. A rod portion 590 is formed in the medium diameter portion 522, and the rod portion 590 penetrates a partition wall 594 between the second chamber 516 and the first return chamber 513, and further the first return chamber 51.
The inside of the third check valve 550 is extended and is in contact with the ball 552 of the second check valve 550.

A rod portion 591 is also formed on the small diameter portion 523, and the tip of the rod portion 591 is in contact with the ball 562 of the first check valve 560. Therefore, when the coil 580 is energized and the spool valve 520 is attracted to the left in FIG. 2, the second check valve 550 is pushed open by the rod 590. Further, when the spool valve 520 moves rightward in FIG. 2, the first check valve 560 is opened by the rod 591.

In FIG. 2, reference numerals 595, 596 and 597 respectively denote the rod portion 59.
It is an O-ring that seals the outer circumferences of 0, the middle diameter portion 522 and the small diameter portion 523 and the inner circumference of the housing.

Next, the operation of this embodiment will be described. Brake pedal 101
When the master cylinder 102 is not hydraulically depressed, the spool valve 520 is operated by the spring 541.
And 540 keep neutral position. The first check valve 560 and the second check valve 550 are both closed as shown in FIG.

Next, the brake pedal 101 is depressed and the master cylinder 1
When brake pressure is generated in 02, this brake hydraulic pressure
It is introduced into the second chamber 516 through the port 531 via the port 902.
Then, the spool valve 520 moves rightward (communication direction) in FIG. 2 due to the pressure introduced into the second chamber 516.
Here, the area of the wheel cylinder receiving surface where the medium diameter portion 522 receives the pressure in the second chamber 516 is A, and the small diameter portion 52
Let B be the area of the wheel cylinder pressure receiving surface that receives the pressure in the third chamber 517. Then, the middle diameter portion 522 is in the second chamber 5
A force obtained by multiplying the pressure inside 16 by the area A of the wheel cylinder pressure receiving surface of the medium diameter portion 522 is received.

When the spool valve 520 moves rightward in FIG. 2, the ball 562 of the first check valve 560 moves the rod portion 59.
Moved to the right by 1. That is, the ball 562 is separated from the valve seat 561 against the biasing force of the spring 563, and the input chamber 511 and the third chamber 517 are in communication with each other. Then, since the constant pressure of the constant pressure source 111 is introduced into the input chamber 511 via the passage 926 and the port 534, this constant pressure flows into the third chamber 517. Then, it flows to the wheel cylinder 113 through the port 535 and the passage 916. At this time, the small diameter portion 523 receives a force obtained by applying the pressure of the third chamber 517 to the wheel cylinder pressure receiving surface area B in the left direction in the drawing, and until this force becomes equal to the force received by the middle diameter portion 522. The first check valve 560 remains open.

While the first check valve 560 is open, a constant hydraulic pressure is introduced from the constant pressure source 111 to the input chamber 511, and further to the third chamber 517 via the first check valve 560. A constant hydraulic pressure is introduced. When the pressure in the third chamber 517 gradually increases and the force that the small diameter portion 523 receives in the left direction in the drawing becomes equal to the force that the middle diameter portion 522 receives in the right direction in the drawing, the spool valve 520 will Move in the center left direction (communication direction). Then, the first check valve 560 is closed. If the force applied to the left in the figure overcomes, the first check valve 560 is not only opened, but the spool valve 520 further moves to the left and the rod 590 moves the ball of the second check valve 550. Move 522 to the left in the figure. That is, the second check valve 550 is opened, the second return chamber 514 and the first return chamber 513 are communicated with each other, and the pressure in the third chamber 517 causes the passage 916, the trick passage 916a, the port 536, The hydraulic pressure is reduced by returning the hydraulic pressure to the reservoir 112 through the second return chamber 514 and the first return chamber 513 sequentially.

In this way, the pressure in the third chamber 517 is constantly regulated so that the rightward force in the drawing acting on the medium diameter portion 522 is balanced with the leftward force in the drawing acting on the small diameter portion 523, that is, The pressure transmitted to the wheel cylinder 113 via the passage 916 is a constant multiple of the brake hydraulic pressure of the master cylinder 103. Here, the ratio of the master cylinder pressure receiving surface area A of the medium diameter portion 522 to the wheel cylinder pressure receiving surface area B of the small diameter portion 523 is 4: 1. Then, master cylinder 1
The pressure that is four times the hydraulic pressure generated by 03 is applied to the third chamber 51.
7 is transmitted to the wheel cylinder 113 via the passage 916.

Next, in order to reduce the pressure transmitted from the passage 916 to the wheel cylinder 113, the coil 580 is energized and the large diameter portion 521 is moved from the state shown in FIG. ) Aspirate. Then, the rod portion 590
Moves the ball 552 of the second check valve 550 leftward in the drawing. That is, the second check valve 550 is opened, and the second return chamber 514 and the first return chamber 513 communicate with each other. Then, the first return chamber 513 is connected to the port 532 and the passage 92.
Since it communicates with the reservoir 112 via 8
The pressure in 6 is the trick passage 916a, the port 536, the second return chamber 51.
4) It returns to the reservoir 112 through the first return chamber 513 in sequence. That is, the pressure in the passage 916 is reduced by that amount, and eventually the pressure transmitted to the wheel cylinder 113 is reduced.

When the coil 580 is not energized, the passage 9
The pressure output to 16 is A / B times the brake hydraulic pressure generated by the master cylinder 103.
Therefore, when the coil 580 is energized, the force applied to the small diameter portion 523 in the left direction in the figure by the pressure of the third chamber 517 and the coil 5
The suction force generated by energizing 80 acts in the left direction in the drawing, and the pressure output to the passage 916 is reduced by the suction force of the coil 580. Therefore, by controlling the current value supplied to this coil 580 and adjusting the magnetic force (suction force) by this coil 580, the third chamber
The pressure introduced from 517 into the wheel cylinder 113 via the passage 916 is controlled.

Although only one coil 580 is used in this embodiment, two coils may be arranged in the same manner as in the above-described embodiments.

Further, the pressure regulator 501 of this embodiment is also provided for each wheel cylinder.

〔The invention's effect〕

As described above, by using the pressure regulator of the present invention, the master cylinder pressure can be increased to an appropriate pressure for the wheel cylinders arranged on each wheel and can be supplied independently. Therefore, the vehicle can be braked with higher accuracy.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention, and FIG. 2 is a sectional view showing a second embodiment. 103 …… Master cylinder, 111 …… Constant pressure source, 113 ……
Wheel cylinder, 250 ... spool valve, 236 ... first coil, 238 ... second coil, 520 ... spool valve, 580 ...
coil

Claims (1)

[Claims] 1. A pressure source for supplying pressure to a vehicle braking device, an on-off valve for shutting off communication by sliding a supply passage from the pressure source to a vehicle wheel cylinder in the axial direction, and the opening / closing valve. And a coil for applying a moving force in the axial direction of the valve, wherein the opening / closing valve includes a master cylinder pressure receiving surface that receives pressure from a vehicle master cylinder, and the vehicle wheel facing the master cylinder pressure receiving surface. A wheel cylinder pressure receiving surface that receives pressure from a cylinder, and the master cylinder pressure receiving surface is set to have an area that is larger than the wheel cylinder pressure receiving surface by a predetermined amount, the pressure on the master cylinder pressure receiving surface, the wheel cylinder pressure receiving surface. The pressure on the vehicle wheel cylinder is adjusted by adjusting the sliding amount of the on-off valve based on the pressure and the amount of electricity supplied to the coil. A pressure regulator for a vehicle braking device, comprising: