JPS6291358A - Braking liquid pressure sealing device for vehicle - Google Patents

Abstract

PURPOSE:To enable designing of an electromagnet device substantially independently of the intensity of a sealed liquid pressure, by a method wherein abutment with the valve seat of a moving valve body moved in one way by means of an electromagnetic force causes sealing of a brake liquid pressure on the brake device side. CONSTITUTION:A valve is formed with a valve body 10a of a balance piston 10 and a valve seat 9. A balance piston 10, which functions to seal a brake liquid pressure and release it and is moved, is governed by effectiveness and ineffectiveness of the spring force of a set spring 11 and a magnetic attraction force, produced through excitation of a solenoid 7, irrespective of a liquid pressure state on the upper stream side and the downstream side of a valve part. Thus, in order to maintain the stop of a vehicle, even when a high liquid pressure is sealed in consideration of, for example, a stop on an upward slope, a surplus burden is prevented from being applied on an electromagnet. This enables the use of an electromagnet device which is small on the whole and has a small capacity.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides a brake fluid that automatically holds the hydraulic pressure transmitted to a brake device when braking a vehicle, regardless of whether the brake pedal is released on the road when the vehicle is stopped. It relates to pressure containment equipment.

[Background of the invention]

As is known, such a brake hydraulic containment device has been proposed to ensure a controlled state when stopping at a traffic light, and is particularly useful for automatic vehicles.

By the way, since such a device, which is generally formed as a solenoid valve type, uses the excitation force of the solenoid valve as the force for containing the hydraulic pressure, it is generally desirable that the capacity of the electromagnetic device be small. There is a limit due to the magnitude of the containment hydraulic pressure.

[Purpose of the invention]

The present invention has been made from this point of view, and its purpose is to improve the relationship between the magnitude of containment hydraulic pressure and the magnitude of excitation force, which has been required in the design of conventional brake hydraulic containment devices, particularly electromagnetic devices. This makes it possible to design an electromagnetic device virtually regardless of the size of the containment hydraulic pressure.
This is where the brake fluid FF containment device is supplied.

Another object of the present invention is to provide a brake hydraulic containment device that is compact and consumes reduced power.

[Summary of the invention]

A feature of the brake hydraulic containment device according to the present invention, which has been made to achieve the above object, is that the movable valve element moves in one direction by electromagnetic force and is brought into contact with the valve seat, thereby reducing the braking force on the brake device side. The movable valve body is a device for containing hydraulic pressure, and the movable valve body is slidably fitted through the guide cylinder, and both ends of the shaft face input liquid chambers communicating with the master cylinder, so as to exert a balanced hydraulic pressure action in the inward direction of the shaft. The central part of the shaft is provided so as to face an output fluid chamber communicating with the brake device, and this output fluid chamber is partitioned through a valve portion having a cross-sectional seal diameter that is approximately the same diameter as the input fluid chamber on one side. The valve part is configured to be opened and closed by the cooperation of a fixed valve seat and a valve part formed on the movable valve body, and further, the movable valve body usually opens and closes the valve part by a biasing spring force. The valve portion is biased to a position where it opens and is moved by the action of the electromagnetic force to close the valve portion.

[Embodiments of the invention]

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

Embodiment 1 In FIG. 1, 1 is a body, and inside is a stepped cylinder la whose diameter gradually increases toward the opening.

lb and lc are formed. A solenoid 7 of an electromagnet device is integrally fixed to the opening via a plate 5 by an outer yoke 6, and due to the fixation of the outer yoke 6, the cylinder lb.

A piston guide 4 that is fitted over 1c and has a stepped inner cylinder part, a spacer 13 and a plug 12 located at the opening edge of the large diameter part of the inner cylinder of this piston guide 4, and further located at the axial center of the solenoid 7. Inner yoke 8 as a fixed iron core
are fixed as shown in the figure.

The cylindrical small diameter portion of the piston guide 4 is a guide cylinder 4.
a, a balance piston 10 as a movable valve body is slidably fitted therethrough, and one end thereof is connected to the plug 12.
are facing away from each other. Matako balance piston 10
A set spring 11 is stretched between the balance piston 10 and the plug 12, so that the balance piston 10 is biased toward the other end.

In the above configuration, the piston guide 4, the plate 5,
The outer yoke 7, the inner yoke 8, the plug 12, and the balance piston 10 are each made of a magnetic material, and constitute a magnetic closed circuit generated by the excitation of the solenoid 7. 1~ Therefore, the balance piston 10, which is biased to the left in the figure by the set spring 11 as shown, is attracted by the plug 12 and moves.

Further, a valve body portion 10m is formed on the other end side of the balance piston IO, and is formed toward the center of the shaft.
This constitutes a valve part that cooperates with an annular valve seat 9 made of an elastic body that is fixedly assembled and arranged in a part of the cylinder 1a, and this valve part is connected to the balance piston 10 as described above. .

When biased toward the initial position by the spring 11, the flow path is opened, and when the solenoid 7 is energized, the balance piston 10 moves to the right to close the flow path of the valve portion.

Note that 2 is a backup for positioning and supporting the valve seat 9, 3 is a cup holder for pressing the valve seat 9 against the backup 2, and 16 is a hold spring.

Then, a 1 m cylinder of body 1 with the above configuration built-in.
, lb, and lc are chambers inside the large diameter portion of the inner cylinder of the piston guide 4 where one end of the balance piston 10 and the facing surface of the plug 120 face, and are connected to a master cylinder M/C (not shown) via the input boat 14. A chamber facing the other end of the balance piston 10 in the cylinder 1a and communicating with the first input liquid chamber a, the shaft center vertical hole flow path 10 of the balance piston 10.
a second input liquid chamber a, which is connected to the first input liquid chamber a via b;
The input liquid chamber is a chamber that is configured to be able to communicate with and shut off from the second input liquid chamber via the valve portion, and is connected to a wheel cylinder of a brake device (not shown) via the output boat 15. ■
In this example, the cross-sectional diameter of the guide cylinder 4a with which the balance piston 10 is slidably fitted, and the seal cross-sectional diameter of the valve body portion 10m forming the valve portion are provided. are provided so that they have the same dimensions.

Next, we will discuss the operation.

When hydraulic pressure is generated in the master cylinder due to the braking operation of the vehicle, this generated hydraulic pressure is transmitted through predetermined piping to the input boat 14, the first input liquid chamber island, and the vertical hole flow path 10b1 of the balance piston. It is transmitted to the wheel cylinder of the brake device via the valve part of the liquid chamber b1 in the open state, the output liquid chamber C1, the output boat 15, and further a predetermined piping, thereby producing a predetermined braking force.

When the vehicle stops in this state, the solenoid 7 is energized by an electronic control circuit (not shown).

From this K, balance piston 10 is set spring 1
1, and the valve body portion 10m comes into contact with the valve seat 9, thereby cutting off communication between the second input liquid chamber and the output liquid chamber C. .

During the above operation, as described above, the first . The liquid pressure from the second input liquid chamber and the liquid pressure from the output liquid chamber are balanced in the axial direction because the cross-sectional diameter of the guide cylinder 4a and the seal cross-sectional diameter of the valve part are the same size. Therefore, with the exception of spring force, electromagnetic attraction force, and some sliding resistance, no moving force or movement blocking force due to hydraulic pressure acts on the balance piston 10. In this state, even if the hydraulic pressure in the master cylinder reaches zero due to the release of the brake pedal, etc., the hydraulic force acting on the balance piston 10 (only due to the output hydraulic pressure) will still be around the shaft. Since the direction is balanced, the closing of the valve portion (containment of the hydraulic pressure) continues in a stable manner.

After this, the above-mentioned electronic control circuit detects the start operation of the vehicle, and if this releases the excitation of the solenoid 7,
The balance piston is quickly returned to the initial state shown in the figure by the spring force of the set spring 11, and the hydraulic pressure in the output fluid chamber C, that is, the brake device wheel cylinder, is released to the master cylinder side, so that the brake force can be released without any trouble. It will be.

In this way, the brake fluid pressure containment device of this example functions to contain and release the brake fluid pressure, and the moving balance piston controls the hydraulic pressure state on the upstream side and the downstream side of the valve part. Irrespective of the position, the operation is controlled by the spring force of the front and rear springs and the on/off of the magnetic attraction force generated by the excitation of the solenoid. Even in the case where a large brake fluid pressure is to be contained, there is no need to place a heavy burden on the electromagnet, and the overall effect is that an electromagnetic device with a small size and small capacity can be used.

In addition, in order to transmit even greater hydraulic pressure to the foil cylinder side in the braking hydraulic pressure containment state, a chamber is installed between the input liquid chamber and the output liquid chamber to allow one volume of pressure liquid to flow in the direction of the output liquid chamber. A directional valve may also be provided. In addition, the cross-sectional diameter of the guide cylinder and the cross-sectional diameter of the seal of the valve part should not be strictly the same, but may vary depending on the respective magnitudes of the spring force of the set spring, the excitation force of the solenoid, or the force relationship between the two. For example, the seal cross-sectional diameter of the valve portion may be set slightly larger. This is because there is an advantage that the hydraulic force of the output liquid chamber can be used to return the balance piston that closes the valve portion toward its initial position.

In addition, the electronic control circuit that turns on and off the excitation of the solenoid described above receives signals from, for example, a brake pedal road presence detection switch, a wheel speed zero detection circuit, an accelerator pedal road presence detection switch, a clutch connection detection switch, etc. are used as inputs, and output signals corresponding to the braking operation to stop the vehicle and the next start operation are issued at a predetermined timing. Specifically, this is used in known brake hydraulic containment devices. The electronic control circuit may be used as is.

Embodiment 2 In this embodiment shown in FIG. 2, the solenoid 7, inner yoke 8, and outer yoke 6 are shared, and the body 1 having the internal structure shown in FIG. 1 is independently assembled and fixed on both sides. It shows what happens when This is a preferred example of applying a brake fluid pressure containment device to each brake system in a vehicle having an independent dual piping brake system, and each system has the functions and effects shown in Figure 1 above. In addition to this, since the solenoid part as an electromagnet device is shared, the overall size can be reduced and the number of parts can be reduced.

〔Effect of the invention〕

The brake hydraulic containment device according to the present invention allows the electromagnetic device to be designed substantially regardless of the magnitude of the containment hydraulic pressure, thereby reducing the overall volume (particularly the miniaturization of the solenoid) and reducing power consumption. reduction, etc. can be obtained, and its effectiveness is extremely large when it comes to devices for actual vehicles.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an outline of the configuration of a single-type brake hydraulic containment device showing an embodiment of the present invention, and FIG. 2 is a diagram showing an outline of the device for dual-acting piping. 1: Body 1m, lb, lc Nijirif p- 2: Ba, Kua, Pu 3: Force, holder 4: Piston guide (magnetic material) 5 Nibrate (magnetic material) 6: Outer yoke (magnetic material) 7: Solenoid 8: Inner yoke (Magnetic material) 9: Valve seat 10: Balance piston (movable valve body) 11: Set spring 12 Nibrag (magnetic material) 13 Ni spacer 14: Input boat 15: Output boat 16: Hold spring

Claims (1)

[Claims] A device for sealing off brake fluid pressure on a brake device side by a movable valve body moved in one direction by electromagnetic force and coming into contact with a valve seat, the movable valve body slidingly fitting through a guide cylinder. Both ends of the shaft face input fluid chambers that communicate with the master cylinder and receive balanced hydraulic pressure in both directions, while the center of the shaft faces an output fluid chamber that communicates with the brake device, and this output fluid The chambers are divided and communicated via a valve portion having a cross-sectional seal diameter that is approximately the same diameter as the input liquid chamber on one side, and the valve portion is formed by cooperation between a fixed valve seat and a valve body portion formed on the movable valve body. The movable valve body is normally biased by a biasing spring force to a position where the valve portion is opened, and is moved by the action of the electromagnetic force to close the valve portion. A vehicle brake hydraulic pressure containment device characterized by: