JPS5819909B2 - Acceleration/deceleration sensing valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acceleration/deceleration sensing valve device that senses the acceleration/deceleration of an automobile and controls the opening/closing of a fluid passage.

Various configurations are known as conventional devices of this kind, but one with an extremely simple configuration is the one described in Japanese Patent Application Laid-Open No.
There is one described in Japanese Patent No. 1969 and shown in FIG.

In the conventional device shown in FIG. 1, a valve chamber 53 formed by a valve body 51 fixed to the vehicle and a lid 52 fixed thereto has an axis A-A extending in the longitudinal direction of the vehicle and a set slope. A ball 54 having a diameter slightly smaller than the diameter of the valve chamber 53 is formed into a cylindrical shape having an angle θ, and a ball 54 having a diameter slightly smaller than the diameter of the valve chamber 53 forms an inclined surface at the bottom of the circumferential surface of the valve chamber 530 based on its own weight and inertia. The force of the ball 54 trying to go down the slope 55 due to the weight of the ball 54 is Fl, and the ball 54 moves down the slope 55 due to the inertial force of the ball 54.
Let F2 be the force that causes the vehicle to rise, and when the deceleration (or acceleration) of the vehicle is below the set value, the relationship F1≧F2 will occur, and therefore the ball 54 will go down the slope 55 as shown in the figure and exit the fluid outlet 56. When the deceleration of the vehicle is larger than the set value, the relationship Fl<F2 occurs, and the ball 5
4 up slope 55 to open fluid outlet 56 and allow flow from fluid inlet 57 to fluid outlet 56 .

Vibration is applied to the ball 54 when the car is running, but this vibration causes the ball 54 to wobble significantly in the vertical direction (this is suppressed because the inner diameter of the valve chamber 53 is slightly larger than the diameter of the ball 54, This prevents ball malfunctions.

In the case shown in FIG. 1, since the slope 55 is formed on the circumferential surface of the cylindrical valve chamber 53, when the axis A-A does not lie within a vertical plane parallel to the longitudinal direction of the vehicle, are the movement direction of the ball 54 along the slope 55 and the ball 5
4 do not match in the horizontal plane, the relationship of F2 to the acceleration/deceleration of the vehicle changes from the one at the time of design, and the acceleration/deceleration sensing characteristics of the valve device deviate from the one at the time of design. Become.

A state in which the axis A-A does not lie within a vertical plane parallel to the longitudinal direction of the vehicle means that the valve body 51 is fixed to the vehicle.
This is caused by variations in the posture of the robot, especially in the direction of rotation around the vertical direction.

Eliminating this variation is difficult under conditions of mass production.

The present invention, as shown in Fig. 1, allows the ball to move up and down a slope with a set gradient based on its own weight and inertia, and the ball is caused to wobble greatly in the vertical direction due to vibrations when the car is running. Even if the orientation of the valve body fixed to the vehicle in the direction of rotation about the vertical axis changes, the direction of movement of the ball along the slope and the direction of the inertia vector of the ball The object of the present invention is to make the acceleration/deceleration sensing characteristics more stable than conventional ones by making them coincide in the horizontal plane.

In order to solve this problem, the present invention has a slope formed by an upwardly expanding conical surface formed at the bottom of the valve chamber, a fluid outlet opening in the center of this conical surface, and a fluid outlet opening at the center of the conical surface. The inner surface of the lid facing the ball is formed into an upwardly expanding conical surface having the same slope as the conical surface, and the interval between these conical surfaces is made slightly larger than the diameter of the ball.

In the configuration we have, the slope on which the ball ascends and descends is composed of an upwardly expanding conical surface, so the direction of motion of the ball along the slope and the inertia vector of the ball are:
Regardless of the orientation of the valve body fixed to the vehicle in the direction of rotation around a vertical axis, the acceleration/deceleration is always the same in the horizontal plane, and therefore the acceleration/deceleration due to variations in the above orientation of the valve body fixed to the vehicle Variations in sensing characteristics are eliminated, and acceleration/deceleration sensing characteristics are more stable than conventional ones.

By forming the inner surface of the lid into an upwardly widening conical surface with the same slope as the conical surface at the bottom of the valve chamber, and by making the interval between these conical surfaces slightly larger than the diameter of the ball, it is possible to improve the running of the vehicle. Malfunctions of the ball due to vibration can be suppressed to the same extent as with conventional devices.

Furthermore, in the conventional device, when the ball 54 climbs the slope 55 and opens the fluid outlet 56, a large amount of fluid in the space on the left side of the ball 54 flows to the fluid outlet 56;
Since the fluid in the right side space of No. 4 flows through the narrow gap between the ball 54 and the circumferential surface of the valve chamber 530 to the left side space of the ball 54, it acts between the left and right side spaces of the ball 54 to push the ball 54 to the left side. A pressure difference occurs, and this pressure difference could cause the valve device to malfunction. However, in the present invention, a large gap is formed between the ball and the circumferential surface of the valve chamber, so the ball can close the fluid outlet. There is no differential pressure created around the ball when it is opened, so the above-mentioned malfunctions seen in conventional devices do not occur.

Then, as mentioned above, the valve body fixed to the vehicle,
Since the orientation in the direction of rotation around the vertical axis does not affect the acceleration/deceleration sensing characteristics, it is useful when installing in a place where space is limited and many devices are installed, such as the engine room of a car. Since the mounting orientation can be arbitrarily changed around the vertical axis to avoid interference with equipment, design for mounting on the vehicle is easy.

An embodiment of the present invention will be described below with reference to FIG.

In the drawing, 1 is an inlet for connecting the M/C (master cylinder) side hydraulic piping, 2 is an outlet for connecting the W/C (wheel cylinder) side piping, 3
is a hose port for connecting to a vacuum source (engine manifold), 4 is a cut valve with spring 5 and ball 6
and sheet 7.

Reference numeral 8 denotes a decompression chamber whose volume changes as the piston 9 moves in and out, allowing the W/C side hydraulic pressure to be decompressed and restored.

10 is a servo motor with a flexible diaphragm 1 inside.
It has a servo piston 12 supported at 1, thereby dividing the interior space into a first chamber 13 and a second chamber 14.

15 is a spring located in the chamber 14 and connected to the servo piston 1
2 to press the piston 9 to the left in the figure to open the decompression chamber 8.
The volume of the cut valve 4 is kept open, and the cut valve 4 is kept open.

16 is a solenoid valve for switching between vacuum and atmosphere;
Acceleration/deceleration sensing valve 18 (hereinafter referred to as valve 18).

), connected to chamber 14 via passage 19 .

The solenoid valve 16 has an air volume 20, and the valve chamber 21 communicates with the first chamber 13 through a passage 22 and is normally connected to the passage 1.
7 to cut off the atmosphere side, and when the renoid 23 is magnetically excited by a signal current from the anti-skid computer, the passage 17 side is cut off and the atmosphere side is opened.

The valve 18 has a fluid inlet 31 that communicates the valve chamber 27 with a ball 26 and a passage 17 disposed so as to be movable on an upwardly expanding conical surface 25 having a fluid outlet 24 at the bottom.
Therefore, when the ball 26 is at the lowest position of the conical surface 25, the fluid outlet 24 is closed, and communication between the valve chamber 27 and the fluid outlet 24 is cut off.

Then, the response deceleration is set based on the angle θ of the conical surface 250.

28 is a lid having a convex conical surface 29 opposite to the conical surface 25;
The angle is the same as the conical surface 250 angle, and serves as a guide so that the ball 26 is prevented from flying up and rolls smoothly.

Although it is installed with the direction indicated by arrow A directly above it in the vertical direction, the orientation of the device in the front and rear, right and left directions of the automobile does not matter when it is installed, as is clear from the structure.

A passage 30 communicates the passage 19 and the passage 17 and is smaller than the fluid outlet 24 .

The operation will be explained based on the above configuration.

First, during normal braking, the hydraulic pressure from the M/C passes through the cut valve 4 and the pressure reducing chamber 8 to pressurize the W/C and generate braking force.

Next, when the wheels lock or are about to lock due to sudden braking on a slippery road, the solenoid valve 16 is actuated by a command current from an anti-skid computer (not shown) that senses this, and the solenoid valve 16 is activated. Passageway 22
is cut off from the passage 17 and communicated with the atmosphere port 20, and is connected to the chamber 1.
3, the atmosphere is introduced.

At this time, since the chamber 14 is connected to the vacuum source through the hose port 3, a force is generated in the servo piston 12 due to the pressure difference, which overcomes the spring force of the spring 15 and moves the servo piston 12 to the right in the figure. do.

The piston 9 is pushed by the pressure inside the chamber 8 and the servo piston 1
2, the cut valve 4 closes, the W/C side circuit volume increases, the W/C pressure decreases, the braking force is reduced, and the locking of the wheels or the fear of locking is eliminated.

Then, once the wheel lock or fear of locking is resolved,
Upon sensing this, the command current from the computer is turned off, the solenoid valve 16 returns to the state shown in the figure, and the atmospheric passage is cut off, so the chamber 13 is communicated with the vacuum chamber 14 via the valve 18. Since the pressure difference applied to the servo piston 12 decreases, the spring force of the spring 15 pushes back the servo piston 12 and the piston 9, reducing the volume of the chamber 8, thereby restoring the W/C pressure and closing the cut valve 4. When the valve is opened, the M/C and W/C are communicated.

At this time, it is generally preferable that the recovery speed of the W/C pressure is increased slowly on a low μ road and quickly on a high μ road.

On the other hand, on a low μ road, since the vehicle deceleration is below the set value, the inertial force acting on the ball 26 of the valve 18 is small and the ball 26 does not move and remains in the position shown in the figure, so the fluid outlet 24 is blocked. , the passage from the chamber 13 to the chamber 14 is narrowed by a small passage 30), so the servo piston 12
The operation is gradual, and therefore the recovery speed of the W/C pressure is slow.

Next, on the other high μ road, since the vehicle deceleration is larger than the set value, the inertial force acting on the ball 26 is strong, the ball 26 climbs the conical surface 25, the fluid outlet 24 is opened, and the chamber 13 Air rapidly flows into the chamber 14, and the W/C pressure rises rapidly.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional device, and FIG. 2 is a longitudinal sectional view of an embodiment of the present invention. 27... Valve chamber, 25... Conical surface,
26...Ball, 24...Fluid outlet, 28...Lid, 31...Fluid inlet.

Claims (1)

[Claims] 1. A valve body fixed to a vehicle, a valve chamber formed by the valve body and a lid fixed to the valve body, a slope having a set slope formed at the bottom of the valve chamber, and a slope accommodated in the valve chamber. a ball that moves up and down the slope based on its own weight and inertia, a fluid outlet opening into the valve chamber so as to be opened and closed by the ball, and the valve chamber. A heating rate sensing valve device comprising a fluid inlet opening to the valve chamber so as to be in constant communication, wherein the slope is formed by an upwardly expanding conical surface formed at the bottom of the valve chamber,
The fluid outlet opens at the center of this conical surface, the inner surface of the shaft facing the conical surface is formed into an upwardly widening conical surface with the same slope as the conical surface, and the interval between the opposing inner conical surfaces The acceleration/deceleration sensing valve device is slightly larger than the diameter of the ball.