JPS5826664A - Hydraulic control valve - Google Patents

Abstract

PURPOSE:To continue the operation of a hydraulic control valve by moving a valve piston even when one side of the hydraulic control valve fails and as well to simplify the structure of thereof, by providing a poppet valve to the valve piston incorporating therein a stationary piston. CONSTITUTION:A stationary piston 23 is incorporated in a valve piston 22, and a poppet valve is disposed therebetween. The valve piston 22 controls hydraulic pressure in an A system by means of a spring 25 and a hydraulic pressure received by the diameter difference (D-d) between the stationary rod 23 and a small diameter part 22a. The large diameter part of the valve piston 22b is subjected to hydraulic pressure in a B system, and is, therefore, moved rightward when the B system fails and has lost hydraulic oil, so that the valve 24 is opened. With this arrangement, hydraulic control may be carried out even when the one hydraulic system fails, without using a balance piston.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a hydraulic control valve that controls the distribution of brake force between the front and rear wheels to an ideal brake distribution force when controlling the front brake. The present invention relates to a hydraulic pressure control valve that appropriately restores hydraulic pressure when the hydraulic pressure supplied to the hydraulic system fails.

Generally, when operating a brake system to brake a vehicle, etc., the braking operation is slightly different for the front and rear wheels.)
If you look at the front wheel, the amount of depression in Gray Betaru is #l
supplies hydraulic pressure proportionally to the rear wheel, while supplying hydraulic pressure to the rear brake unit as a pillow prevents the rear wheel from locking up. A conventional example of a hydraulic pressure control valve that distributes such hydraulic pressure is the one shown in Figure 1, for example. .

A pulp piston 2 having a small diameter part 2M, a large diameter part 2b, and a tapered part 2c is provided in a stepped hole 10 of the valve body 10, and a free piston 3 is provided outside the large diameter part 2b of the valve piston 2. Slidably extrapolated. The free piston 3 can slide within the stepped hole 10 of the valve body 1, and its tip can come into contact with the step of the stepped hole 10, and the free piston 3 can be directed radially inward at the tip. A jaw portion 3a that engages with the valve piston 2 is formed. On the other hand, the valve piston 2 is biased in the axial direction by a cent spring 6 at its distal end, and is biased by a plug 13 fixed to the valve body 1 at its proximal end.
It is designed to be able to slide forward (to the left) while being guided by the free piston 3 under a predetermined pressure. Further, inside the valve piston 2, a hollow hole 7 for forming a fluid passage from the inlet boat 8 opened in the valve body 1 to the I>ic outlet boat 9 corresponds to the small diameter portion 2a and the large diameter portion 2b. It has been established. Hole 7 inside this
At 60 minutes corresponding to the human sprain section 2 of the bicycle, a spring-loaded poppet valve 4 is provided on the same side, and this poppet valve 4 has a free position in the seat 5. The proximal end of the proximal end is in contact with the plug 13.

The poppet valve 4 and the valve seat 5 move relative to each other with the sliding movement of the valve piston 2 to engage and release the fluid passage, thereby closing and opening the fluid passage. .On the other hand,
At the 2\Ef direction of the free piston 3, the other port 11, the outflow boat 12, and the valve body 1 are opened, and the inflow boat 11 leads to the outflow boat 12, forming a single passage. There is.

In addition, at tt+t, hydraulic pressure from two systems Mask-Schilling is applied individually to the inlet boats 8 and 11, and the outflow boat 9 f
d While supplying a predetermined hydraulic pressure to the rear brake unit,
The outflow boat 2 is connected so as to supply the same hydraulic pressure to the front brake unit as that applied to the inflow boat 11.

Is this kind of hydraulic control valve L1? During operation, the same amount of hydraulic pressure is applied to the inflow boats 8 and 11 from the master cylinder, and the free piston 3 moves into the stepped hole l.
It slides in O and abuts against the stepped portion to open the fluid passage from the inflow boat 11 to the outflow boat 12. On the other hand, regarding the fluid passage from the inflow boat 8 to the outflow boat 9, when the fluid pressure in the inflow boat 8 exceeds a predetermined value,
Inside the hollow hole 7 housing the poppet valve 4 and the tapered portion 2C
The valve piston 2 is moved axially by 1 qt according to the surface difference between
The pushing force is set to the l force (left side in Figure 1).Set ring 6
Overcoming the 0 set load, I made the pulp piston reach 2 times within 1 hours. This engages the poppet valve 4 and the valve seat 5 to cool the fluid passage to the outflow boat 9 and cut off the hydraulic pressure in the outflow boat 9. After the hydraulic pressure is cut, when the hydraulic pressure on the inflow boat 8 side increases further, the valve piston 2 returns to its original position and opens the fluid passage from the inflow boat 8 to the outflow boat 9. In this way, during normal brake operation, the increase in hydraulic pressure in the rear brake unit is kept lower than the increase in hydraulic pressure in the front brake unit by opening and closing the fluid passage as the valve piston 2 moves. This prevents the rear wheels from locking up.

On the other hand, if a failure occurs due to some unknown cause in the fluid passage to the front brake unit,
Since the hydraulic pressure in the inflow boat 11 becomes zero, the free piston 3 moves to the right under the hydraulic pressure in the inflow boat 8, comes into contact with the plug 13, and stops. The jaw portion 31 of the free piston 3 is engaged with the tabular capital 2C of the valve piston 2, and prevents the valve piston 2 from moving to the left. The free piston 3 is pushed to the right and the pulp piston 2 is pushed to the left by the two hydraulic pressures in the wholesale and inflow boats 8, but the mutual areas are adjusted so that the force pushing the free piston 3 to the right is greater. By setting , the movement of the pulp piston 2 is prevented by the free piston 3, the fluid passage from the inflow boat 8 to the outflow boat 9 is opened, the rear brake unit is operated, and a failure on the front brake unit side is prevented. It is possible to compensate for the decrease in braking force due to

However, in such a conventional hydraulic pressure control i41 valve, a free piston 3 is extrapolated to the pulp piston 2, and two hydraulic pressure systems for the front brake and the rear brake are provided on both left and right sides of the free piston. In addition to t-value,
When one system fails, the free piston slides, and the structure is such that it prevents the operation of the pulp piston 2 with a force larger than the force that would try to create the pulp piston 2. There was a problem in that the number of points increased, the sandwiching was complicated, and the 9 cost became negative.

The present invention was made in view of these conventional problems, and its purpose is to provide a pulp valve in which a ratio control mechanism in a hydraulic pressure control valve is slidably disposed within a hollow hole formed in the valve body. A piston, a fixed rond that is inserted into the pulp piston and whose end is connected to the valve body, and a poppet valve that is interposed between the pulp piston and the fixed rond and opens and closes a fluid passage passing through the valve piston. The hydraulic system is constructed so that both the hydraulic control operation during normal operation and when one side fails is performed by the sliding movement of the pulp piston, and the structure is divided into parts and the operation is efficient. It can be determined by solving the intermediate color R.

The embodiment of the present invention is heated to 1/sum by comparing the wrinkled drawings.

FIG. 2 is a diagram showing a first embodiment of the present invention.

The hydraulic control valve according to this embodiment includes a pulp body 21 having a hollow hole 26 extending in the axial direction, a valve piston 22 loaded inside the valve body 21, and a pulp body 21 having a hollow hole 26 extending in the axial direction.
It consists of an identification rod 23 that engages with the pulp piston 22 in a circular part thereof, a poppet valve 24 that is attached to the pulp piston 22 and abuts against the fixed rod 23, and a valve seat 30. It consists of a valve [4'' (Bopent valve mechanism) that opens and closes the flow path passing through the valve piston 22.

HARTZ' main body 21 is delayed by the inflow boat 31 which guides the liquid pressure from the mask cylinder etc. into the valve main body 21, and this inflow boat 3]. An inflow boat 33 and an outflow port are provided to form a fluid path separate from these inflow boats 31 and 61c and outflow port 32.

Boat 34 is ringing. The inflow boat 31 contains liquid FkE.
, PA is supplied to the outflow boat 32 as hydraulic pressure PA'7.
leaks out and activates the vehicle's rear brake unit.

On the other hand, the hydraulic pressure p B is supplied to the inflow boat 33 and flows out from the outflow hoard 34 as a hydraulic pressure p B / to operate the front brake unit of the vehicle. In addition, in FIG. 2, the left end portion of the valve body 21, that is, the pulp body 21
At the tip of the pulp piston 22, a support 1 (a material 27 is fixed in the hole 26) having a hole 38 extending in one direction supports the pulp piston 22 at its tip.

The pulp piston 22 is integrally formed with a small diameter part 22a and a large diameter part 22b having approximately the same diameter as the hollow hole 26. It is made of a cylindrical body with a stepped part 22c in contact with the part 22b, and has a stepped part 22c in the distance.
A fluid passage hole 36 is formed from the base of the large diameter portion 22b to the small diameter portion 22a. A through hole 37 is formed to guide the liquid in the hollow hole 26 of the pulp piston 22 to the fluid passage hole 36, while this flow and the passage hole 36 are connected to the outflow boat. A through hole 39 communicating with 32 is formed. This pulp piston 22 has a large diameter portion 22b sealed to the inner wall of the hollow hole 26 of the pulp body 21, and a tip portion of the small diameter portion 22a inserted into the hole 38 of the support member 27. while being held by an elastic piece 28 attached to the
It is biased by a spring 25 interposed between the supporting member 27vk end and the stepped portion of the pulp piston 22, and in order to support the biasing force of the spring 25, the base end is attached to the fixed rod 23. ing.

The indicator rond 23 is formed of a stepped cylindrical body having a small-diameter projection 23a at its tip, and is inserted into a hollow hole 26Pj at the end of the pulp body 21 by a plug 35. An engagement hole 40 that extends over the fluid escape hole 36 and is wider than the fluid escape hole 36 is formed in the 14th part of the pulp piston 22, and accommodates the tip of the fixed iron 23 in a relatively slidable manner. It is engaged with this. Therefore, the pulp piston 22 can reciprocate in the axial direction within the hole of the pulp body 21 while being guided by the supporting member 27 at the distal end and by the fixed rod 23 at the proximal end. Note that iD of the fixed rod 23 is set to be larger than the diameter d of the small diameter portion 22a of the pulp piston 222.

On the other hand, a poppet pulp 24 supported by a spring member 29 that is supported by the pulp piston 22 is disposed in a fluid passage hole 36 that is bored in the pulp piston 22 and extends in the axial direction. A valve seat 30 is attached to the inner wall of the pulp piston 22 in this position.

The boppet valve 24 has a bottle part that can be moved in parallel with the stroke inside the valve seat 30, and a stopper part that fits into the valve seat 30 and blocks the flow of fluid. The tip of the bottle portion is brought into contact with the small cap 23- of the fixed iron 23 by the action of the spring member 290. Therefore, when the pulp piston 22 slides from the second FiA center stone to the fifth position due to the action of hydraulic pressure, the poppet pulp 24 and the valve seat 30 etc. are moved to the fixed iron 23 by the action of the spring member 29. The valve mechanism remains in contact and engages with the valve seat 30 to perform all valve operation of the flow path passing through the pulp piston 22. The inflow boat 31 and the outflow boat 32 are arranged on the upstream and downstream sides of this valve mechanism. On the other hand, an inflow boat 33 and an outflow boat 34 that supply hydraulic pressure to the front brake unit are provided on the opposite side of the large diameter portion 22b of the valve piston 220 from the inflow boat 31 and the outflow boat 32, respectively. .

In a liquid EE phosphorus control valve having such a configuration, when brake splash is applied, inflow boats 31 and 3 are discharged from the master cylinder.
3, hydraulic pressures Pm and Pg of the same magnitude are applied to the front and rear end surfaces of the large diameter portion 22b of the valve piston 722 and the fluid passage hole 3.
6 receives a suppressing action to the right or left, respectively. When the hydraulic pressure PA approaches the sprint point set by the spring 25, the pulp piston 2
The force pushing the pulp piston 22 to the left overcomes the pressing force of the spring 25, and moves the pulp piston 22 to the left.

This causes the valve seat 30 to engage the poppet pulp 24 and block the flow path to the outflow boat 32, so that the weeping pressure PA' is canted. When the hydraulic pressure P is further increased after this hydraulic pressure PA' is cut, the pressing force of the spring 25 overcomes the force pushing the pulp piston 22 to the left, and the pulp piston 22 is placed in the red position. Returning to the flow path, the flow path is transmitted to the outflow boat: placed in position,
Since it forms a flow path to the front brake unit, this flow path is not subject to valve operation by the 4[movement of the pulp piston 22, and the outflow boat 34 always has one hydraulic pressure PB' (
= P B ) is supplied to the front brake unit.

By opening and closing the flow path by valve operation accompanying the reciprocating movement of the pulp piston 22, the increase in the hydraulic pressure PA' to the rear brake unit is suppressed to a lower level than the increase in the hydraulic pressure Pi' in the front brake unit. It is possible to prevent the ring from locking.

On the other hand, if a failure occurs in the flow path to the front brake unit, the hydraulic pressure Ps becomes zero, so the pulp piston 22 receives the hydraulic pressure PA, moves to the right, and connects to the identification rod 23. It touches and stops. As a result, the poppet pulp 24 and fm3o no longer match9, and the outflow boat 32
Since the flow passage to is left in a single release state, the medium is supplied to the inflow boat 31 at a hydraulic pressure Pm, and the medium is directly applied from the outflow boat 32 to the rear brake unit as a hydraulic pressure Pa'.
Compensates for the decrease in braking force due to failure on one side.

Note that the diameter dimension d of the small diameter portion 22a of the pulp piston 22,
By varying the diameter difference between the fixed rod 23 and the fixed rod 23, the load due to the hydraulic pressure Pm acting on the stepped portion 22c and the load 1 due to the hydraulic pressure PB acting on the rear surface of the large diameter portion 22b can be reduced. It is possible to change the relationship and to vary the rate of reduction of the hydraulic pressure Pm' of the medium discharged from the outflow boat 32.

FIG. 3 is a diagram showing the embodiment of FIG. 2 of the present invention. In the above-mentioned embodiment #1, the fixing rod 23 was fixed to the pulp body 21 with a screw, whereas in this embodiment, the fixing rod part of the pulp body 21 was attached to a bag with a mounting hole 42 formed therein. (6) The proximal end of the fixed iron 23 is fitted into the mounting hole 42 with the interposition of a seal member 43 and fixed.

Therefore, the central axis of the fixed iron 23 can be made to substantially coincide with the central axis of the retaining hole 40, and the fixed iron 23
The inclination of the threaded portion can prevent the sliding resistance from increasing between the pulp piston 22 and the fixed iron, as in the case where the pulp piston 22 is fixed with a screw.

9 As explained above, according to the present invention, the valve body has a hollow hole, the pulp piston has a stepped shape and is slidably disposed within the pulp body, and the pulp piston is fixed to the pulp body.
Protrudes into two hollow holes: A fixed rond engaged with the bell piston and inserted into the flow path passing through the pulp piston,
By providing a hydraulic pressure control valve based on a poppet valve mechanism that opens and closes the flow path following the sliding movement of the pulp piston, the pulp piston is fixed in the flow path Ni1ij when one side fails, so the structure is improved. It was possible to make a pressure control car that is simple and easy to manufacture. In addition, by setting the dimensions of the small-diameter portion of the pulp piston having a cedar-like shape and the fixed rod in a predetermined relationship, it is possible to avoid gaps in the hydraulic pressure control during normal operation. It is now possible to obtain a pressure reduction rate that corresponds to the diameter difference, making it easier to set the pressure reduction rate.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing an example of a conventional liquid pressure control valve, Fig. 2 is a cross-sectional view showing a liquid ball control valve according to a first embodiment of the present invention, and Fig. 3 is a cross-sectional view showing an example of a liquid ball control valve according to a first embodiment of the present invention. FIG. 2 is a sectional view showing a hydraulic control valve according to an example. 21...Pulp 7' body 22...Pulp piston 23
...Fixed Ronto 24...Poppet Pulp 25...
Spring 26...Hollow hole 30...Valve seat
31, 33 River inflow boat 32. 34... Outflow boat

Claims (1)

[Scope of Claims] (a) A pulp body forming two flow paths, and a pulp piston having a stepped shape formed by a small diameter part and a large diameter part and slidably disposed within the pulp body. a fixed iron fixed within the pulp body and fitted into the pulp piston so as to be movable relative to the pulp piston; and a fixed iron which is disposed in a flow path passing through the pulp piston and opens and closes this flow path following the sliding movement of the pulp piston. In connection with the valve mechanism, the diameter of the fixed rod and the diameter of the small diameter portion of the pulp piston are set in a predetermined relationship to obtain a constant pressure reduction rate, and two systems of hydraulic pressure are applied to WkJ of the pulp piston. In addition, if one system fails, move the pulp piston to the one where the valve mechanism becomes the flow path.
A hydraulic pressure control valve characterized in that it is oriented rectangularly in the I direction. (2) The hydraulic control@1 valve according to claim 1m, wherein the fixed iron is inserted into the small hole of the pulp body together with a sealing member.