JPS5920759A - Autostop valve for vehicle - Google Patents

Abstract

PURPOSE:To make the automatic retention of a braking force by interposing an electromagnetically operating valve in a hydraulic pressure path between a master cylinder and a wheel cylinder, and keeping a braking hydraulic pressure by the valve from the stop to the start of a vehicle. CONSTITUTION:The hydraulic pressure from the master cylinder when braking is applied is transmitted via a port 7, liquid chambers A, B, and a port 6 to the wheel cylinder so that the brake is actuated. When the vehicle is stopped, a solenoid 3 is magnetized, and an armature 13 is attracted to the left. Accordingly, a sheet member 8 is pushed to the left, the sheet surface 8b abuts on a ball (b), and the liquid chamber A and the liquid chamber B are cut. Therefore, the braking pressure at that time is kept in the output liquid chamber B. In this state, when the master cylinder is pressurized again, if its hydraulic pressure exceeds the hydraulic pressure in the liquid chamber B, the pressure liquid flows via a piston cup 9 from the liquid chamber A to the liquid chamber B to increase the braking pressure. When the solenoid is deenergized by the starting operation the braking is released.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulp device (hereinafter referred to as an auto-stop valve) for maintaining brake fluid pressure when a vehicle (four-wheeled vehicle, two-wheeled vehicle, etc.) is stopped.

Generally, when braking a vehicle, it is better to keep the vehicle stopped until the next time the vehicle moves forward or backward (or backward) to prevent the vehicle from moving unexpectedly, but in normal driving operations, the vehicle stops. In many cases, the parking brake mechanism is used, such as by simply releasing the brake pedal later, or when driving on a slope.

However, such operations are complicated, and since the parking brake is often not used except on slopes, there is a risk that stopped vehicles may be left with no brakes applied at all, causing them to move unexpectedly.

Therefore, in view of these various points, in the present invention, after a braking operation of a vehicle having a hydraulically actuated braking mechanism, that is, a brake operation is performed and the vehicle is stopped 17, the next forward (or backward) movement of the vehicle is stopped. During operations such as engaging the clutch and starting, the mask cylinder is mechanically and automatically maintained to maintain the wheel cylinder fluid pressure (brake fluid pressure) in the brake device. An electromagnetically actuated valve (referred to as an auto-stop valve) is installed in the hydraulic pressure path connecting the wheel cylinder and the wheel cylinder, and this auto-stop valve stops the wheel cylinder from stopping the vehicle (braking operation) to the next vehicle starting operation. The present invention provides a structure in which the brake fluid pressure within the brake is continuously maintained.

An auto stop valve with such a configuration basically consists of an input fluid chamber A that communicates with the mask cylinder, an output fluid chamber B that communicates with the brake device, a valve mechanism that can open and close communication between these fluid chambers, and a valve mechanism that can open and close communication between these fluid chambers. The valve mechanism will be constructed with an electromagnetic actuation mechanism that can maintain the valve mechanism in a closed state against hydraulic pressure, but such an auto-stop valve is repeatedly operated every time the vehicle stops at a traffic light, etc. It is something in which an action is performed.

High sealing performance and durability of the valve mechanism are required;
In addition, when repressurizing the brake fluid pressure while a constant fluid pressure is maintained, it is desirable to take into consideration that the repressurization is performed reliably. As a mechanism, a so-called ball valve of the type in which a valve seat and a ball valve body are brought into contact and separated is used, and as a mechanism to ensure liquid flow from input liquid chamber A to output liquid chamber B during repressurization, This device is characterized by using a unidirectional liquid flow permitting means, preferably a piston cup type seal portion.

The gist of the present invention is to provide a sheet member that is slidably fitted to the inner peripheral surface of the cylinder so as to partition an input liquid chamber A that communicates with the mask cylinder and an output liquid chamber B that communicates with the brake device; A ball seat surface facing one of the fluid chambers A and B communicating channels formed in the shaft, and a ball disposed opposite to this ball seat surface, and a moving force applied to the seat member or the ball by electromagnetic force. It is equipped with an electromagnetic actuating mechanism that causes the seat surface and the ball to come into contact with each other, and a spring that normally separates the seat surface and the ball. An auto stop valve for a vehicle is characterized in that it is configured to shut off.

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

In FIG. 1, l is a cylindrical pickpocket or pug with a large diameter head 1a formed at one end, and a threaded part 1b is provided at the other small diameter end, into which the NAND member 2 is screwed. It will be worn. A housing case 4 containing a solenoid 3 is fitted onto the outer periphery of the sleeve 1 and fixed by tightening the NAND member 2.

Further, a plug 5 is screwed onto the open end side of the nut member 2. The boat 6 of this plug 5 is communicated with a brake device (not shown), and the port 7 formed in the sleeve head 1a is communicated with a mask cylinder (not shown).

Inside the cylinder of the sleeve 1, a seat member 8 for configuring a valve mechanism and a stop armature 13 for configuring an electromagnetic actuating mechanism are accommodated, and the former is connected to a piston cup 9 attached to the outer circumference of the armature. The inside of the cylinder is divided into input and output liquid chambers A and H, and the armature 13 is located within the input liquid chamber A.

The piston cup 9 allows the pressure tLK of A-+H to pass therethrough.

The structure of the valve mechanism is such that a flow path 8a communicating between the input and output liquid chambers A and B is formed in the shaft of the seat member 8, and a conical ball seat surface 8b is formed at the opening to the B liquid chamber. is formed, and a ball 10 is placed opposite this seat surface 8b. Then, this ball 10 is pressed against the tip of the inner end projection of the plug 5 by the holding ring 11 attached to the seat member 8, which forces the piston that is spaced apart from the seat surface 8b. There is.

Reference numeral 12 designates a first center spring that is used to keep the seat member 8 centered in a predetermined position when not in operation, together with a second set spring 14 attached to an armature 13 (to be described later), and the spring force of these set springs 12 is small. Just set it as a value.

The armature 13, which forms the driving part of the electromagnetic actuation mechanism,
The solenoid 3 presses and moves the seat member 8 against the first center spring 2 and the bold spring 11 (moves to the left in the figure), and normally the seat surface of the seat member 8 8b and ball 1o
The seat member 8 is lightly pressed in the same direction via a poppet 15 supported by a second set spring 14 so as not to set the amount of separation too large.

Next, its operation will be explained.

In this example, the solenoid 3 is energized in response to a predetermined electrical command several seconds after the vehicle has stopped due to, for example, a vehicle braking control operation, and the solenoid 3 is energized in response to the next vehicle starting (or reversing) operation.
For example, the solenoid is controlled to remain energized until the clutch is operated without cooling, but in the case of a so-called automatic vehicle, the solenoid is de-energized when the accelerator is pressed down. In short, it is best to maintain the brake fluid pressure before releasing the manual brake operation, and to install a control so that the next vehicle starting operation will not be hindered. control can be selected.

Here, in the initial stage when the brake hydraulic pressure is transmitted through the auto-stop pulp in the illustrated state, the hydraulic pressure in the axial direction acts in a balanced manner on the armature 13, so the armature 13, the seat member 8, and especially the seat surface of this seat member 8 The relationship between the ball 8b and the ball 1o is maintained at 1 as shown, and the fluid chambers A18 are in communication with each other, so that brake fluid pressure is directly transmitted from the master cylinder to the foil cylinder.

In this state, when the vehicle speed decreases and the solenoid 3 is energized after stopping, the armature 13 is attracted to the left in the figure, and the seat member 8 is pressed to the left in the figure, and the seat surface 8b is pressed against the ball 10. , and the output fluid chamber B, that is, the brake fluid pressure, is maintained at the current fluid pressure state.

Needless to say, when the solenoid 3 is de-energized, the initial state is restored.

Note that if the mask cylinder side is re-pressurized with the liquid pressure maintained in the output liquid chamber B, this pressurized liquid will flow in one direction of the piston cup 9 if it exceeds the liquid pressure value in the output liquid chamber B. Due to the sealing properties, the brake fluid flows into the output fluid chamber B and increases the brake fluid pressure value.

In the embodiment shown in FIG. 2, the seat member 8' and the ball 10
'The arrangement of the ball iron core 16 is opposite to that shown in FIG.
The difference is that this embodiment is disposed inside the cylinder, but the other configurations are similar to those of the previous embodiment. Therefore, common members are given the same reference numerals and their explanations are omitted.

In this example, from amateur 13 to poppet 15
The force applied to the ball 10' to move the seat member 8b' toward the seat surface 8b' becomes a force that moves the seat member 8' to the left in the figure via the hold spring 11. The spring of the first set spring 12 is set to a larger value, and accordingly, the limit of movement of the seat member 8' to the right in the figure is set by locking with the stepped shoulder of the ball iron core 16. It is configured as follows.

With the configuration of this example as well, the same operation as in the previous example can be obtained, and automatic and mechanical brake fluid pressure maintenance can be obtained when the vehicle is stopped at a traffic light or the like.

In addition, this example has the advantage that a relatively small electromagnetic force is sufficient. In other words, when the brake fluid pressure (the fluid pressure in the output fluid chamber B) is maintained and the fluid pressure in the input fluid chamber A becomes zero (the pedal is released), the seat member 8' has a pressure on the right side in the figure. Although only pressure is applied, this sheet member 8' is restricted from moving in the same direction by the ball iron core as described above, so this imbalance in hydraulic pressure is not related to electromagnetic force. In the end, it is sufficient that the electromagnetic force is capable of resisting the hydraulic pressure of a small area acting on the ball 10'.

As described above, the auto stopper valve according to the present invention can automatically maintain the braking force when the vehicle is stopped in a normal vehicle or a so-called automatic vehicle, and is extremely useful.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the auto-stop valve of the present invention, and FIG. 2 is a cross-sectional view of another embodiment. 1...Sleeve member 1a...Head ■b...Thread part 2...Nut member 3...Solenoid
4...Using case 5...Plug
6.7...Port 8.8'...Seat member 8
a s 8 ”...Flow path Bb, Bb'...Seat surface 9...Piston cup xo, to;...Ball 11...Hold spring 12...First set spring 13... Amateur 14...2nd
Set spring 15...Poppet 16...Ball iron core.

Claims (1)

[Claims] 1. A sheet member slidably fitted to the inner peripheral surface of the cylinder so as to partition an input liquid chamber A communicating with the mask cylinder and an output liquid chamber B communicating with the brake device, and a liquid chamber A formed in the shaft portion of this sheet member. , a ball seat surface facing one of the liquid chambers of the B communication flow path, and a ball disposed opposite to this ball seat surface, and a moving force is applied to the sheet member or the ball by electromagnetic force to bring the seat surface and the ball into contact. It is equipped with an electromagnetic actuation mechanism that moves around the ball and a spring that normally separates the seat surface and the ball.
A sealing member that forms a liquid-tight seal between the inner peripheral surface of the cylinder of the Autostop Pulp-02 sheet member and the cylinder is configured to block communication between liquid chamber A and liquid chamber B. The auto-stop pulp for a vehicle according to claim 1, characterized in that it is a one-way seal that only allows pressure fluid to flow to the vehicle.