JPH03271048A - Hydraulic controller - Google Patents

Abstract

PURPOSE:To utilize a throttle so effectively even at the time when hydraulic pressure is low, by installing a control piston which receives pressure at the inlet or outlet side of the throttle and moving a piston to the inlet side until a position where a movable body takes a valve seat after opening a valve against a preload spring. CONSTITUTION:Hydraulic pressure fed to an inlet 4 from a master cylinder 3 at the time of low pressure is fed to a rear-wheel braking device via a valve V, a passage 26 of a piston 11, a center hole 15 of a control piston 13, a clearance being formed between a movable body 50, being moved so as to separate from a valve seat forming member 44 by pressure fluid, an outlet chamber 51, a passage 16 and an outlet 5. When a wheel shows a lock tendency in a suchlike state, a hydraulic fluid for return used is put back to the side of the master cylinder 3 from the side of the outlet 5 by a pump of an illustrated antiskid device, but if this hydraulic fluid is fed to the outlet chamber 51, it passes through a throttle S and is put back to the side of the master cylinder 3. In brief, pulsation is damped by this throttle S and thereby the hydraulic fluid is returned to the inside of the piston 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a hydraulic pressure control device used in a brake device of a vehicle, etc., and particularly suitable for use in an anti-skid device.

[Prior Art and its Problems] Two types of control devices are installed in the brake circuit of a vehicle or the like to ensure safety during brake operation. A typical example of this control device is a hydraulic pressure control valve, and in addition to this hydraulic pressure control valve, there is also an anti-skid device.

The anti-skid device automatically controls the brake fluid pressure to prevent the wheels from locking. In this device, the hydraulic fluid on the two wheel cylinder side is loosened and discharged into the circuit, and the discharged hydraulic fluid is pressurized by a pump. and return it to the master cylinder side.

When both such a hydraulic pressure control valve and an anti-skid device are provided in the brake circuit, if the hydraulic pressure control valve is placed closer to the master cylinder than the pump return part of the anti-skid device, the rear wheel brake can be Anti-skid control can be performed based on the hydraulic pressure reduced by the hydraulic pressure control valve, and the control becomes easy.

However, with this arrangement, the return pressure from the pump is transmitted to the master cylinder side, causing discomfort to the driver through the brake pedal.

Therefore, it is preferable to provide a throttle on the downstream side of the master cylinder to attenuate the pulsation caused by the return pressure from the pump.

However, simply arranging such a throttle and a hydraulic pressure control valve in series poses a problem in that it takes time and effort for piping and increases the size of the device. Furthermore, if these are simply integrated, as proposed in Japanese Patent Application No. 1102292, for example, the throttle operates only when the hydraulic control valve is operated.
There is a problem in that when the hydraulic pressure control valve is not activated, it does not operate, and the throttle cannot perform its full function.

[Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned circumstances, and even when the valve device and throttle of the hydraulic pressure control valve are integrated, it is compact and can be used when the hydraulic pressure is low. Another object of the present invention is to provide a hydraulic pressure control device in which the throttle works effectively.

[Means for Solving Problem E] The above object is to provide a main body with an inlet connected to the master cylinder side and an outlet connected to the wheel cylinder side, and a main body formed with the inlet and the outlet connected to each other. a stepped hole, a piston movably inserted into the stepped hole, a passage connecting the inlet side and the outlet side of the piston, and an outlet provided in the passage and opened and closed according to the movement of the piston. a valve that limits an increase in side pressure; a preload spring that biases the piston in a direction in which the valve opens; and a movable body that is disposed on the exit side of the piston and is movable in accordance with the movement of the piston. A hydraulic control device comprising: a valve seat on which the movable body is seated when the piston moves to the inlet side; and a throttle that throttles liquid movement from the outlet side to the inlet side when the movable body is seated on the valve seat. , control to receive pressure on the inlet side or outlet side of the throttle at one end and move the piston toward the inlet side against the preload spring to a position where the valve is opened and the movable body is seated on the valve seat; This is achieved by means of a hydraulic control device having a piston.

[Function] According to the above configuration, even when the pressure is low, the control piston moves toward the inlet side due to the difference in the effective pressure receiving area of the control piston, and this causes the movable body to sit on the valve seat. In this case, the hydraulic pressure control valve is not closed, and therefore, the throttle works effectively even at low pressure when the hydraulic pressure control valve is in an open state.

[Example] Hereinafter, an example of the hydraulic pressure control device of the present invention will be described with reference to the drawings.

In FIG. 1, (1) shows the entire hydraulic pressure control device.

In this hydraulic pressure control bag M (1), the main body (2) is attached by screwing to the master cylinder (3).

The cylindrical main body (2) has an inlet (4) connected to the master cylinder (3) side, an outlet (5) connected to the wheel cylinder side (not shown), and an inlet (4) and an outlet (5). It has a stepped hole (6) formed in communication with the. Exit(
5) is constituted by a joint (7), and the joint (7)
) is connected to one end of a pipe that communicates with the wheel cylinder via an anti-skid device (not shown).

At the attachment part to the master cylinder (3), a threaded part (8) is formed on the outer periphery, and a seal ring (lO) is held between this male threaded part (8) and the side wall (9).

In the stepped hole (6) of the main body (2), there is a passage (26) in the center.
A stepped piston (11) is movably arranged. The large diameter part (2) on the outlet side (5) of the piston (11)
1) is fitted with a seal ring (22) and fits into the cylindrical control piston (13), and the small diameter part (23) on the inlet (4) side is fitted with a seal ring (24) and fits into the main body ( 2
) fits into the inner circumference of the

The control piston (13) is slidably arranged relative to the main body (2) and has a seal ring (3) in a groove (13a) on its outer periphery.
9) is attached. A recess (17) that opens into the center hole (15) is formed at the end of the center hole (15) formed in the control piston (13) on the outlet (5) side.

A recess (18) is also provided at the end of the large diameter portion (21) of the piston (11) that slides within the center hole (15) of the control piston (13).
) is formed. Further, a contact plate (19) having a plurality of small holes (19a) formed therein is press-fitted into the center hole (15) of the control piston (13).

On the other hand, in the hole (27) on the inlet (4) side of the main body (2),
A poppet valve body (29) is accommodated through the cylindrical member (28), and the tip end of the poppet valve body (29) faces the pressure chamber of the second master cylinder (3) even though it is not shown. The poppet valve body (29) has a through hole (29a) in the axial direction, and has a protrusion (3
0) is a valve seat (3) formed at the tip of the piston T111.
1), a valve m is formed here.

The poppet valve body (29) is held in the hole (27) by a valve spring (33) whose one end is engaged with a lid member (32) that covers the opening of the main body (2). 32)
is locked and fixed in a groove formed on the outer periphery of the opening of the main body (2).

A preload spring (36) that biases the piston (11) in a direction to open the valve (V) is accommodated in the medium diameter hole (6a) of the stepped hole (6) of the main body (2), The preload spring (36)
One end is locked to the flange portion (37) of the piston (11), and the other end is locked to the stepped portion (38) of the main body (2). Further, the hole (6a) is maintained at atmospheric pressure by a through hole (41) formed in the main body (2), and its opening is covered by a dust seal (42).

A mushroom-shaped movable body (50) is accommodated in the outlet chamber (51) of the main body (2), and the movable body (50) is a valve stretched in the recess (7b) of the joint (7). It is urged toward the entrance (4) by a spring (43). The shaft (5) of the movable body (50)
0a) is inserted into the hole (44a) of the valve seat forming member (44), and the end surface of the shaft (50a) comes into contact with the contact plate (19), thereby restricting movement toward the inlet (4) side. At the same time, a gap between the valve seat forming member (44) and the valve seat forming member (44) is secured.

Note that a passage (16) communicates between the recess (7b) of the joint (7) and the outlet (5) provided with a female thread (7a).

The valve seat forming member (44) is located in the outlet chamber (51) of the main body (2).
The joint (7) is positioned and fixed by attaching a seal ring (40) to the joint (7) and screwing it to the main body (2). Hole of valve seat forming member (44) (
44a) functions as a valve seat, and a notch (44b) is formed with an enlarged diameter in the hole (44al), and the notch (44b) constitutes a passage for throttling.

A valve seat forming member (in which such a notch (44bl) is formed)
44) and the movable body (50), a throttle (S) that restricts liquid movement from the outlet (5) side to the inlet (4) side when the movable body (50) comes into contact with the valve seat forming member (44). ) is formed,
In the illustrated state, the spherical portion (50b) of the movable body (50) is seated from the valve seat forming member (44), and the throttle (S) is disabled.

In a hydraulic control device (1) equipped with such a throttle (SJ) and a valve (V), the stepped hole (6) of the control piston (13)
In other words, in FIG. 1, the end surface (13bl) of the control piston (13) that is in contact with the flange portion (37) of the piston (11) is the step end surface (13bl) of the stepped hole (6). 6b), the valve lift of the valve (V) is A (the distance from the valve seat (31) of the piston (11) to the protrusion (30) of the poppet valve body (29)),
When the valve lift of the throttle (S) is C (distance until the spherical part (50b) of the movable body (50) closes the hole (44a) of the valve seat forming member (44)), C<B<A. It is set in advance so that the relationship is as follows.

Hydraulic pressure control device according to an embodiment of the present invention! (1) is configured as described above, and its operation will be explained next.

When no pedal force is applied to the brake pedal, it is in the state shown in Figure 1. That is, the valve (V) is opened due to the biasing force of the preload spring (36), and the control piston (13)
One end is in contact with the valve seat forming member (44). Also,
The movable body (50) has a shaft portion (50a) that is connected to the contact plate (19).
, further movement is restricted, and the aperture (S
) is disabled.

From this state, pedal force is applied to the master cylinder (
3) rises to 1, for example, 3 to 4 kg f/cm'' in a range lower than the hydraulic pressure control start pressure of valve m, the hydraulic pressure increases through the inlet (4), the passage (261, the control piston ( 1
3) into the recess (17) through the central hole (15). Then, the control piston (13) receives the pressure on the outlet side of the throttle, that is, the pressure on the recess (17) side, at one end, and moves toward the inlet (4) side against the biasing force of the preload spring (36). ,
As shown in FIG. 2, the end face (13b) is the stepped end face (6a
).

When the control piston (13) moves a distance B in this way, the piston 111) also moves to the inlet (4) side, but as mentioned above, due to the BAA relationship, the valve (V) does not close but remains open. be.

On the other hand, the control piston (13) is connected to the inlet (4) by a distance of B.
When the movable body (50) moves to the side, the shaft portion (50a) of the movable body (50) is pushed against the contact plate (
19). Then, as mentioned above, due to the relationship C<H, the spherical portion (60b) is inserted into the valve seat forming member (hole (40)
4a), and the aperture (S) becomes effective.

The following is a hydraulic pressure control device (1) for such low pressures.
The operation will be explained with reference to FIG.

The hydraulic pressure supplied from the master cylinder (3) to the inlet (4) at low pressure is transmitted through the valve (V) and the passage (26) of the piston (11).
), the center hole (151) of the control piston (13), the gap formed between the movable body (50) moved away from the valve seat forming member (44) by pressure fluid and the hole [44a], and the outlet It is supplied to the rear wheel brake system via the chamber (51), the passage (16) and the outlet (5).

When the wheels show a tendency to lock in such a state, the pump of the anti-skid device (not shown) returns the return hydraulic fluid from the outlet (5) side to the master cylinder (3) side, but this hydraulic fluid flows into the outlet chamber. (51), the hydraulic fluid passes through the throttle (Sl) and returns to the master cylinder (3) side.In other words, the pulsation is damped by the throttle (S) and the hydraulic fluid flows into the piston (11). be returned.

In this way, in the hydraulic pressure control device +1), the throttle (S) operates effectively even when the pressure is low.

The operation of the hydraulic pressure control device (1) at high pressure will be described below with reference to FIG. 3.

The driver applies pedal force and the mask cylinder (3)
The hydraulic pressure inside is higher than a predetermined value, e.g. 20 to 30 kgf/cm
”, valve m operates. In other words, the hydraulic pressure acting on the rhombic area on the inlet (4) side and the outlet (5) side of the piston (11) overcomes the spring force of the preload spring (36). , the piston C11) moves from the state shown in the second figure to the poppet valve body (29) side.

The valve seat (31) seats on the protrusion (30) and the valve (Vl) closes.

As a result, hydraulic control of the pressure fluid supplied to the rear wheel brake device is started.

Even if valve m is in operation in this way, of course the throttle (S)
is in valid state. Therefore, the hydraulic fluid that is returned when the wheels show a tendency to lock passes through the throttle (S) and is returned to the master cylinder (3) side, so that its pulsation pressure is attenuated.

On the other hand, when the driver stops braking and suddenly takes his/her foot off the brake pedal, the inside of the master cylinder (3) instantly becomes a negative pressure state, and in synchronization with this, the control piston (13)
The pressure near the recess (17) is extremely reduced. Then,
The control piston (I3) quickly moves toward the outlet (5) due to the biasing force of the preload spring (36), and the contact plate (19) moves the shaft (50a) of the movable body (50) toward the outlet (5). By pressing the movable body (50) to the side, the movable body (50) changes from the state shown in the third figure to the first state.
The state returns to the illustrated state, and the aperture (S) becomes invalid.

Therefore, the brake fluid returned from the rear wheel brake system is transferred to the movable body (50) formed by the throttle (Sl is disabled).
and the valve seat forming member (44) freely back into the control piston (13).

In addition, due to sudden loosening, the recess (17) of the control piston (13)
) becomes negative pressure, the working fluid in the outlet chamber (rainbow) passes through the throttle (S) and is introduced into the recess (17).
7) may rise again and push the control piston (13) toward the inlet (4), but the piston (11)
Since the diameter of the throttle formed inside is larger than that of the throttle (S), the hydraulic pressure in the recess (17) quickly flows into the passage (26) of the piston (11). without any influence on the sliding movement of the control piston (13) towards the outlet (5).

As described above, a hydraulic control device according to an embodiment of the present invention! (In 11, the throttle (Sl) can be activated even if the pressure inside the master cylinder (3) is low, and the throttle (S) can be activated even if the brake force is suddenly relaxed.
does not impair the operation of valve m.

FIG. 4 shows another embodiment of the hydraulic pressure control device according to the present invention, in which the same elements as those of the hydraulic pressure control device shown in FIG. 1 are designated by the same reference numerals.

This fluid pressure control bag i! (Even if it is 611, the distance B until the end surface (55b) of the control piston (55) comes into contact with the stepped end surface (6b) of the stepped hole (6) is the valve lift of the valve (V) A , where C is the valve lift of the throttle (S), the relationship is set in advance so that C<B<A.

In this embodiment, a second preload spring (56) is stretched between the control piston (55) and the valve seat forming member (44), and one end of the second preload spring (56) is our board (1
9) to the step (58) of the control piston (55). Also, the contact plate (19) is the control piston C5
5) is locked to the stepped portion (58). Also, the board (1
9) is a small diameter hole (5) formed in the control piston (55).
7) It is press-fitted inside.

In this way, even if the hydraulic pressure control device 1 (61) includes the second preload spring (56), the hydraulic pressure control device (1
It performs the same action as 1, but if you want to change the knee point at which hydraulic pressure control starts, by adjusting the second preload spring (56), even a slight change of 2 points can be done. It can be done easily.

For example, the spring force of the second preload spring (56) acts in a direction that weakens the spring force of the first preload spring (52), so the stronger the second preload spring (56) is, the more the spring force of the second preload spring (56) is weakened. , the hydraulic pressure control start pressure can be lowered, that is, the knee point can be lowered.

FIG. 5 shows still another embodiment of the present invention, in which the same elements as in FIG. The end face of (6
The distance B until contact with b) is set in advance so that the relationship C<B<A as described above, where A is the valve lift of the valve m and C is the valve lift of the throttle (S). There is.

In this embodiment, a large recess (62c) that opens into the recess (62b) is formed on the end surface of the joint (62) constituting the outlet (5) on the control piston (64) side. In addition, the valve seat forming member (63) disposed on the end face of the joint (62) is
It has a hat shape formed by extending a cylindrical member to a plate-like member, and the cylindrical part (63a) is connected to the control piston (63a).
4) through a seal ring (65). A hole (63c) is formed in the plate-shaped portion (63b) of the valve seat forming member (63), and the hole (63c) opens into a recess (66) formed in the control piston (64).

The piston (11) is connected to the cylindrical portion (
63a) Slidably arranged on the inner periphery, and further equipped with a contact plate (19
) is also press-fitted into this cylindrical portion (63a).

The hydraulic control bag fl (671) formed in this way
When the hydraulic fluid is returned to the outlet chamber (51) by the anti-skid device, the hydraulic fluid is transferred to the large recess (62c) formed in the joint (62) and the hole (62c) formed in the valve seat forming member (63). 63cl, guided into the recess (66) and controlled piston (
64) receives the pressure at one end on the recess (66) side.

That is, the control piston (64) receives the pressure at one end before being throttled by the throttle (S). The pressure before being throttled by the throttle (Sl), that is, the pressure P on the inlet side of the throttle, is the pressure at the throttle (Sl).
The pressure after being throttled by S), that is, the pressure on the exit side of the throttle P2
The control piston (60) cannot move when the pressure inside the master cylinder (3) is lower than that of the control pistons (13) and (55) shown in FIGS. 1 and 4. start, thereby allowing the throttle [Sl to be activated at lower pressures.

Each embodiment of the present invention has been described above, but the present invention includes:
Various modifications can be made based on the technical idea of the present invention without being limited to these embodiments.

For example, in the above embodiment, the throttle passage of the throttle (S) was formed by the notch (44b) formed by increasing the diameter of the hole (44a) of the valve seat forming member (40). It is also possible to provide a groove in the spherical portion (50b) of 50) and configure the structure with the groove.

Further, in the above embodiment, the control piston (13L control piston (55)
) and are press-fitted into the outlet side end of the control piston (64), but the contact plate (19) may be movably mounted without being particularly press-fitted.

[Effects of the Invention J As explained above, according to the hydraulic pressure control device of the present invention, the throttle operates effectively even at low pressure when the hydraulic pressure control valve is in the non-operation standby state, and the throttle is not integrally stopped. However, no special piping is required, and miniaturization can be achieved.

[Brief explanation of drawings]

1 to 3 show an embodiment of the hydraulic pressure control device of the present invention. A cross-sectional view of the hydraulic pressure control device when the hydraulic pressure has increased slightly before pressure control is started,
FIG. 3 is a cross-sectional view of the hydraulic pressure control device after hydraulic pressure control has started, FIG. 4 is a cross-sectional view showing another embodiment of the hydraulic pressure control device according to the present invention, and FIG. 5 is a cross-sectional view of the hydraulic pressure control device according to the present invention. It is a sectional view showing still another example of a pressure control device. In addition, in the figure. 1 3 6 6 0 55 ・・・・・・・・・・・・ 61)(67)・・・・・・ 64 ・・・・・・・・・・ S) ・・・・・・・・・・・・■) ......... Hydraulic pressure control device main cylinder Master cylinder with inlet/outlet stage Tag piston Control piston passage Preload spring movable body Control piston Hydraulic pressure control device Control piston throttle Rivalve substitute rice Hanjin Fig. 1 1...Layer pressure side'a device 2...Main body 16...Passage 36...Preload spring 5・・・・・・Outlet ■・・・・・・Valve 6
......Stepped hole 11...Piston 13...II control piston

Claims (1)

[Claims] A main body having an inlet connected to the master cylinder side and an outlet connected to the wheel cylinder side, a stepped hole formed in the main body to communicate the inlet and the outlet, and a stepped hole movably inserted into the stepped hole. a piston, a passage communicating the inlet side and the outlet side of the piston, and a valve provided in the passage and opened and closed according to the movement of the piston to limit a rise in pressure on the outlet side;
a preload spring that biases the piston in a direction in which the valve opens; a movable body that is disposed on the outlet side of the piston and is movable according to the movement of the piston; and when the piston moves toward the inlet side. In a hydraulic control device having a valve seat on which the movable body is seated, and a throttle that throttles liquid movement from an outlet side to an inlet side when the movable body is seated on the valve seat, an inlet side or an outlet side of the throttle A hydraulic control piston is provided that receives pressure at one end to open the piston against the preload spring and move the piston toward the inlet side to a position where the movable body is seated on the valve seat. Control device.