JPS6291351A - Proportioning valve for two system - Google Patents

Abstract

PURPOSE:To release proportioning operation of a normal system, by a method wherein the orientation of a moving spring spanned between two sets of proportioning valves positioned in parallel is inclined when the oil pressure of the one system is dropped. CONSTITUTION:When an oil pressure in each system of a double piping is normal, the spring force of a single point of tangency spring 19 is uniformly exerted on two control pistons 8 and 108 to provide point of tangency pressure reduction control of a normal rear wheel side brake oil pressure. However, when either the hydraulic systems fails in operation, a moving seat 18 is inclined. Thus, engagement of the tip of an extension shaft part 18b with a stepped part 22 (or 122) formed in a stationary spring seat 20 causes stop movement of the moving spring seat 18. This causes locking of a control piston 8 of a normal system (the upper proportioning valve mechanism side in a drawing), resulting in release of point of tangency pressure reduction operation of rear wheel side brake oil pressure due to movement of the control piston 8.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a two-system provost canning valve, preferably a buroboshi canning valve that has a function of canceling pressure reduction control in the other system when one system fails in the hydraulic system; Concerning valves.

[Background of the invention]

Proportioning valves are used for the purpose of approximating the ideal brake force distribution ratio of the brake force distribution ratio of both front and rear wheels, and various types have been provided in the past.

As one such provisioning valve, suitable for vehicles with a double piping type brake hydraulic system, the provisioning valve for the 92 system is designed so that the spring at the end of the sheath is shared by the two provisioning valves. Various proportioning valves have also been proposed.

By the way, as a countermeasure against oil pressure failure in one system, with regard to the two-system probosci and two-ring valve, it is desirable that the provisioning function of the other system not be hindered, and more preferably, that the provisioning function of the other system be Brobosi,
In many cases, it is also necessary to devise ways to compensate for the lack of fuel in the vehicle as a whole by canceling the warning function.

[Purpose of the invention]

The present invention has been made based on this point of view, and its purpose is to provide a proportioning valve for two systems that share one corner spring, in the event that a hydraulic pressure failure occurs in one system, the other system lineage noprobosi, ning pulp bloboshi.

To provide a two-system brake system and a brake valve capable of compensating for insufficient braking force of the entire vehicle by canceling the braking operation and thereby transmitting a large brake hydraulic pressure to the rear wheels of the normal system.

[Summary of the invention]

The characteristic of the dual-system brake valve of the present invention, which was made for this purpose, is that it moves within the cylinder by balancing the biasing spring force and hydraulic action, thereby adjusting the rear wheel brake hydraulic pressure. Proportioning valves each having a control piston for opening and closing a valve part to reduce the pressure compared to the front wheel brake hydraulic pressure are provided for each of the two independent brake piping systems, and these are arranged in parallel. A movable spring seat that follows the movement of the control piston is installed across the end extending outside the cylinder, and the spring force of a common corner spring that engages with this movable spring seat is applied to the biasing force. The two-system proportioning valve is configured to apply a uniform force to both control pistons as a spring force, and the movable spring seat is provided so as to be tilted when only one of the control pistons is moved, and the movable spring seat is provided to tilt when only one of the control pistons moves. The movable spring seat is provided with a movement preventing means that engages with the movable spring seat.

[Embodiments of the invention]

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

In the figure, 1 is a body, 2 is a casing fixed to the body, and two sets of provocation valve mechanisms having exactly the same function are housed inside the body.

In the following explanation, unless otherwise specified, the proportioning valve mechanism on the upper side of the figure will be explained, and the other proportioning valve mechanism on the lower side will be indicated by adding 100 to the reference numeral to indicate the same member. The explanation was omitted.

3 is a large diameter cylinder formed in the body 1, and from this large diameter cylinder 3 toward the casing 2 side, two cylinders with a stepped large diameter and a gap are formed in sequence, and the cylinder with the largest diameter is a sleeve. A fixed sleeve 5, which forms a fixed cylinder 4 and is fixed by a stopper ring 7, is assembled therein. Reference numeral 6 designates a small diameter cylinder of the inner cylindrical portion of the fixed sleeve 5, which is spaced apart and opposed to the large diameter cylinder 3.

The first part of the control piston, 8', which is slidably fitted through the small diameter cylinder 6, is the second part of the control piston, which is slidably fitted to the large diameter cylinder 3, and these first part 8 and second part The control piston 8' is integrated by caulking (5).

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 A1 facing the central part of the shaft of the control piston 8 via 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 Al is connected to a hydraulic chamber of a tandem master cylinder (not shown) via an input boat 14, and the output oil chamber A0 is connected to a rear wheel brake device via an output boat 15.

The on-off valve 9 is composed of a combination of a ball valve body 10, a hold spring 11, a valve seat 12, and a locking rod 13.
In the normal state shown in the figure, the locking rod 13 presses the ball valve body 10 against the hold spring 11, thereby separating it from the valve seat 12 and opening the flow path (therefore, the input and output oil chambers Ai + Ao are in communication). When the control piston 8 moves to the left in the figure, the ball valve body 10 is no longer suppressed by the locking rod 13 and comes into contact with the valve seat 12, closing the flow path (
Therefore, the input/output oil chamber A11Ao is shut off).

Note that 16 is a piston cup, and 23 and 24 are seal rings, which are used to pressure-seal each oil chamber Al + Ao.

Next, a description will be given of the mechanism for applying a spring force to the control piston 8 to generate a break point. The other end of each control piston 8,118 extending from the small diameter cylinder 6.116 toward the casing 2 side is provided to form a protrusion 8m, 108m with a semicircular cross section. A movable spring seat 1 into which corresponding four parts 18apH8m having a semicircular cross section are fitted.
8 is assembled, and one corner spring 19 is engaged with this movable spring seat 18. Note that 17 is a spring storage chamber in the casing 2, and 20 is a corner spring 1.
9 is a fixed spring seat that supports the other end of the spring.

The movable spring seat 18 has one corner spring 1
9 is engaged with the two parallel control pistons 8.108, thereby uniformly applying a biasing spring force to the surface control pistons 8.108. .

In addition, the movable spring seat 18 of this example has the bending point spring 1
9 has an extended shaft portion 18b, and the shaft portion 11
The tip of 8b is opposed to the recess 21 of the fixed spring seat 20, and when the movable spring seat 18 moves in response to approximately equal pressing reaction force from the two control pistons arranged in parallel, Furthermore, the wall of the recess 21 has a stepped portion 22°12 with which the extending tip engages when the movable spring seat 18 is tilted.
2 are provided in a pair, and by engaging with these stepped portions, movement of the movable spring seat 18 to the left in the figure is prevented.

The tilting of the movable spring seat 18 occurs when only one of the two parallel control pistons 8, 108 moves, and the state shown by the imaginary line in the figure is the case when only the upper control piston 18 moves. Indicates a leaning state. Such a state occurs when the hydraulic system associated with the lower part of the figure fails, and conversely, when the hydraulic system associated with the upper part of the figure fails, the movable spring seat 18 tilts in the opposite direction. This will occur in the clockwise direction of Figure C).

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°108, Normal corner point depressurization control of the rear wheel side brake hydraulic pressure is performed, but when either one of the hydraulic systems fails, the movable spring seat 18 is tilted, and therefore the extended shaft portion 18 is caused to tilt.
A stepped portion 22 formed at the tip of b on the fixed spring seat 20
(or 122), the movement of the movable spring seat 18 is prevented, thus locking the movement of the control piston 18 in the normal system (as shown, the side of the upper proportioning valve mechanism), thereby locking the movement of the control piston 18. The turning point pressure reduction operation of the rear wheel brake hydraulic pressure due to the movement of 18 is canceled.

In addition, it goes without saying that the size relationship is such that the tilting of the movable spring seat 18 does not cause a shutoff operation of the on-off valve section in the control piston 8 (or 108).

Furthermore, the present invention is not limited to such embodiments; for example, a known inertial valve mechanism may be applied in combination to each proboscising valve mechanism, or a single system failure detection system may be used. A switch for detecting the tilting of the movable spring seat may be installed therein.

According to the above two-system provisioning valve, 2
In addition to the effect of sharing some parts of the proportioning valves in the set, a preferable control state is obtained in which the corner point depressurization control of the other system is canceled when one system fails, Moreover, the structure for this purpose is extremely simple and easy.

〔Effect of the invention〕

According to the present invention, by adopting and utilizing a simple structure in which the posture of a movable spring installed across two parallel sets of probosi smelting pulp is tilted when one system fails in hydraulic pressure, Since it is possible to cancel the blobbing and firing operation of the normal system, 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 large.

[Brief explanation of drawings]

The drawing is a schematic vertical cross-sectional view of the structure of a probone and Jung valve showing an embodiment of the present invention. 1: Body 2: Casing 3. 103: Large diameter cylinder 4, 104 Nice sleeve fitting cylinder 5. 105: Fixed sleeve 6, 106: Small diameter cylinder 7. 107: Stroke, palling 8. 108: Control piston (Part 1) 8', 108': Control piston (second part) 9.109:
Opening/closing valve part 1G, 110: Ball valve body 11.111: Hold spring 12.112: Valve seat 13.113: Locking rod 14.1
14: Input boat 15. 115: Output boat 16. 116: Piston force, Bu 17: Spring housing chamber 18: Movable spring seat

Claims (1)

[Claims] The proportioning valve, which has a control piston for opening and closing the valve part, controls the rear wheel brake hydraulic pressure to be reduced compared to the front wheel brake hydraulic pressure by moving within the cylinder using the balance between the biasing spring force and the hydraulic pressure. A movable spring seat is provided for the piping and arranged in parallel, and a movable spring seat is installed to span the ends of the two parallel control pistons extending outside the cylinder and follow the movement of the control pistons. , a two-system proportioning valve configured to apply the spring force of a shared corner spring that engages with the movable spring seat equally to both control pistons as the biasing spring force, wherein the movable spring seat is
A proportioning valve for two systems, characterized in that it is provided so as to be tilted when only one of the control pistons moves, and further provided with a movement preventing means that engages with the tilted spring seat.