JPS62173359A - Proportioning valves for two hydraulic systems - Google Patents

Abstract

PURPOSE:To compensate the lack of the braking force over the whole of a vehicle by using a break point spring common to the proportioning valves for two hydraulic systems, and releasing the proportioning action in another hydraulic system if the oil pressure in one hydraulic system is not activated. CONSTITUTION:Proportioning valves are arranged in parallel with two systems of brake pipes, said valves opening or closing valve members 9, 9 balancing the spring force action of a break point spring 12 (not shown) against the action of oil pressure and thereby moving control pistons 8, 8. Normally, this controls the reduction in break point pressure, but if either one of hydraulic systems is not activated, a movable base 18 is moved in the lateral direction, so that the tip end of a flange member 18b is engaged with the recessed part 21 of the body, and thus the movable spring base 18 is prevented from moving. The movement of the control pistons 8, 8 in the normal system is therefore locked so that the break point pressure reduction action of break oil pressure on the rear wheel sides is released. A large brake oil pressure is thereby conveyed to the rear wheels to make up the brake power over the whole of a vehicle.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a two-system Zoro proportioning valve, and more particularly to a proportioning valve that has a function of canceling pressure reduction control in the other system when one system fails in the hydraulic system. .

[Background of the invention]

The fo positioning valve is located at the front and rear of the vehicle; a (7)
It is used for the purpose of approximating the brake force distribution ratio to the ideal brake force distribution ratio, and various types have been provided in the past.

As one of such pro-bone yoning-malbu,
Various proportioning valves for two systems, such as K and L, have been proposed that are suitable for vehicles with double-piped brake hydraulic systems, in which a so-called turning point spring is shared by two provisioning valves. .

By the way, regarding such a proportioning valve for two systems, as a countermeasure in case of oil pressure failure in one system, it is necessary to prevent the proportioning function of the other system from being hindered, and more preferably, to prevent the proportioning function of the other system from occurring. It is often necessary to devise ways to cancel the function to compensate for the lack of braking force in the entire vehicle.

[Purpose of the invention]

This light was developed based on this viewpoint, and its purpose is to provide a proportioning valve for two systems that share one corner spring, in the event of oil pressure failure in one system Hc, Providing a proportioning pulp for two systems that can cancel the proportioning operation of the proportioning pulp of the other system, thereby transmitting a large brake hydraulic pressure to the rear wheels of the normal system, and compensate for the lack of braking force in the entire vehicle. Then there is this.

[Summary of the invention]

Therefore, the present invention, which has been made for this purpose, is a dual-system provisioning pulp. Prepare for this 1b
1] A type of Zorobortioning valve that opens and closes the valve part by moving the control piston to control the vehicle's rear wheel brake oil pressure to reduce the front wheel brake oil pressure is provided for each of the two independent brake piping systems, and these valves are arranged in parallel. A movable spring seat that follows the movement of these control pistons is installed across the ends of these two parallel control pistons extending outside the cylinder, and a common spring seat that engages with the movable spring seat is provided. There is a two-system proportioning palfte configured to apply the spring force of the bending point Sgeling equally to both control pistons as the biasing spring force, and the movable spring seat is symmetrical with respect to both the control pistons. The engagement is carried out through the Q-Z surface, and when only one of these control pistons is moved, it is arranged to cause a lateral movement accompanied by sliding on a single taper surface, and further lateral movement. A movement preventing means is provided which engages with the movable sedge ring seat that causes the movement to stop the movement.

[Embodiments of the invention]

The present invention will be described below based on embodiments shown in the drawings.

In the figure, 1 is the body, and 2 is a partition wall that divides the valve accommodating part of the cavity inside the body into two parallel cylinder parts. A proportioning pulp mechanism for the system is built-in. In the following description, common members of the proportioning valves on both sides are designated by the same reference numerals.

3 is a large diameter cylinder formed in the body 1, and from this large diameter cylinder 3 toward the spring storage chamber 17 jill, two cylinders are formed that have a sequentially stepped larger diameter, and the cylinder with the largest diameter is A fixed sleeve 5, which forms a sleeve fixed cylinder 4 and is fixed by a stone/mother ring 7 to prevent removal, is assembled. Reference numeral 6 designates a small-diameter cylinder in the inner cylindrical portion of the fixed sleeve 5, which is spaced apart from and faces the large-diameter cylinder 3.

8 is a first part of the control piston that is slidably fitted through the small diameter cylinder 6; 8' is a second part of the control piston that is slidably fitted to the large diameter cylinder 3; 8' are integrated by caulking (hereinafter these will be collectively referred to as control piston 8).

This control piston 8 has a built-in opening/closing valve 9 that opens and closes a flow path by the movement of the piston 8, and an input oil chamber Ai which the central part of the shaft of the control piston 8 faces through this valve 9.
One end of the control piston 8 (the tip inside the large-diameter cylinder 3) is connected to the output oil chamber A0 so as to be able to communicate and shut off. The input oil chamber Ai is connected to a hydraulic chamber of a tandem master cylinder (not shown) via an input port 14, and is also connected to an output oil chamber A. is connected to the rear wheel player device via the output port 15.

Said on-off valve 9? - consists of a combination of a valve body 10, a hold spring 11, a valve seat 12, and a locking rod 13,
In normal operation as shown in FIG.
By pressing 0 against the hold spring 11, the control piston 8 was moved away from the valve seat 12 to open the flow path (thus, the input and output oil chambers Ai and Ao are in communication), and the control piston 8 was moved downward in the figure. At times, the pressure on the beer valve body 10 by the locking rod 13 is released and it comes into contact with the valve seat 12, thereby closing the flow path (therefore, the input and output oil chambers A1 + A□ are shut off).

In addition, 16 is a piston cup, and 30.31 is a husband seal ring, which is used to pressure-seal each oil chamber Ai+A□.

Next, a description will be given of the mechanism for applying a spring force to the control piston 8 to generate a break point. In the device of this example, two sets of mechanisms including the control pistons 8, 8 on both sides are used in the break point generating mechanism. The other ends of each control piston 8.8 extending from the small diameter cylinder 6.6 toward the spring housing chamber 17 form inclined taper surfaces 8m and 8a at both outer sides thereof, as shown in the figure. It is set up like this, this chi! - Inner tapered surface 18 corresponding to surfaces 8a, 8a
a, a movable spring seat 18 with a concave cross section and 18a;
are engaged in combination across these pistons 8.8 on both sides.

The movable spring seat 18 is preferably made of plastic or the like which can provide a surface with a small friction coefficient.

A corner spring 20 is engaged with the back surface (lower surface in the drawing) of the movable spring seat 18 via a spring receiver 19 that is slidable relative to the other in the lateral direction.
The biasing spring force of 0 biases the control spring force equally against the control pistons 8, 8 on both sides. The spring receiver 19 of this example is movable only in the axial direction by means of a cylindrical portion 22 protruding from the body 1.

Further, on the outer side of the movable spring seat 18, a pair of flange portions 18b, 3.8b, which protrude in the lateral direction, are provided on both sides in correspondence with the cheek surfaces 18a, 18a. The flange portion 18 is provided so as to be able to engage with concave stepped portions 21, 21 provided opposite to the body 1 when the movable spring seat 18 moves laterally.

When the above-mentioned both control pistons 8, 8 are making substantially the same axial movement, the movable piston 1
8 causes a following movement only in the coaxial direction, but if only one control piston 8 moves, the movable spring seat 18 will not move due to the engagement relationship between the tenor 4-surfaces 3a and 18m. A lateral hypermotion occurs, which causes the engagement of the flange portion 18b with the stepped portion 21, which restricts the movement of the movable piston 18 and thus restricts the control piston 8.
movement will be restricted.

According to the above configuration, if the oil pressure in each system of the double piping is normal, the spring force of one corner spring acts equally on the two parallel control pistons 8.
Normal corner point pressure reduction control of the rear wheel brake oil pressure is performed (see Fig. 2), but sometimes the movable spring seat 18 moves laterally, so that the tip of the flange 18b forms a step 21 on the body. By engaging with the movable spring seat 18, the movement of the movable spring seat 18 is prevented (see FIG. 3), and therefore the movement of the control piston 18 of the normal system (in the figure, the left provocation pulp mechanism side) is locked. The turning point pressure reduction operation of the rear wheel brake hydraulic pressure due to the movement of the control piston 18 is canceled.

In the above description, it goes without saying that the dimensions A should be set so that movement of the movable spring seat 18 does not cause a shutoff operation of the on-off valve section in the control piston 8.

Furthermore, the present invention is not limited to such embodiments; for example, a known inertial valve mechanism may be applied in combination to each proportioning valve mechanism, or in order to detect a failure in one system, A switch may be installed to detect the lateral movement of the movable spring seat.

In this case, in addition to the effect of sharing some parts of the two sets of provisioning pulp, a preferable control state is achieved in which the corner point depressurization control of the other system is canceled when one system fails. Moreover, the structure of such a target vessel is extremely simple and easy.

〔Effect of the invention〕

According to the present invention, a simple structure is adopted and utilized in which the posture of a movable spring installed across two sets of proportioning halves arranged in parallel moves laterally when one system fails in hydraulic pressure. As a result, it is possible to cancel the normal system's glopositing and ning operations, and since the number of parts is small and the assembly work is easy, it can be provided at an extremely low cost, and its practical effects are extremely impressive.

[Brief explanation of drawings]

The drawings are diagrams showing an outline of the configuration of a Zorro portioning valve according to an embodiment of the present invention - a longitudinal cross-sectional view of an example, in which FIG. 1 shows normal (non-braking) conditions, FIG. 2 shows normal operation, and FIG. 3 indicate the time when one system fails. To? D, 2: Casing, 3: Large diameter cylinder, 4 Nissuri one-piece fitting cylinder, 5: Fixed sleeve, 6: Small diameter cylinder, 7: Stopper ring,
8: Control piston (I1 part), 8'2 control piston (2nd part), 9: Opening/closing valve part, 10: Goal valve body,
11: Hold spring, 12: Valve seat,
13: Locking rod, 14: Input port, 15: Output y
, 74-t, 16: piston cup, 17: spring housing chamber, 18: movable spring seat, 18a: tapered surface, 18b = protruding flange, 19 spring receiver, 20: corner spring, 21: locking step , 22: Cylindrical portion, 30.31: Seal ring. Figure 1 Figure 2 Figure 2 Intermediate: 20

Claims (1)

[Claims] Equipped with a control piston that can be moved within the cylinder to balance the biasing spring force action of the corner spring and the hydraulic action, and the movement of this control piston opens and closes the valve part to reduce the rear wheel brake hydraulic pressure of the vehicle relative to the front wheel brake hydraulic pressure. Proportioning valves of the control type are provided for each of the two independent brake piping systems, and these are arranged in parallel, and these two control pistons are straddled over the ends of the two parallel control pistons that extend outside the cylinder. A movable spring seat that follows the movement of the control piston is installed, and the spring force of a common corner spring that engages with the movable spring seat is applied equally to both control pistons as the biasing spring force. a proportioning valve for use in a proportioning valve, wherein the movable spring seat engages both control pistons through symmetrical tapered surfaces, and when only one of the control pistons moves, the movable spring seat engages the control pistons through a symmetrical tapered surface; It is characterized in that it is provided so as to cause lateral movement accompanied by sliding on a surface, and is further provided with a movement preventing means that engages with the movable spring seat that causes lateral movement and stops said movement. Proportioning valve for two systems.