JPH0450065A - Brake device - Google Patents

Abstract

PURPOSE:To prevent the reduction of rigidity during normal braking and reduce the pulsation of the oil pressure when a skid preventing system is operated by providing a switch valve in the middle of a communicating pipe communicating a brake pipe and an expansion chamber, and opening the switch valve only when the skid preventing brake system is operated. CONSTITUTION:A brake device 21 has the actuator 6 of a skid preventing brake system provided in the middle of a brake pipe 5 communicating a master cylinder 2 and a wheel cylinder 3. A three-way connector 25 with a valve is connected to a brake pipe 5B at the position nearest to a connection port 6a around the connection port 6a of the actuator 6 connected to the wheel side brake pipe 5B, and the branch port 25a of a three-way connector section 25A branched with the brake pipe 5B is communicated to an expansion chamber 13 via a communicating pipe 16 provided with a solenoid valve section 25B in the middle. The valve section 25B is opened only when the skid preventing brake system is operated.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention has a brake device, for example, a skid prevention brake mechanism that controls on/off the brake fluid pressure in the brake pipe of a vehicle to prevent wheels from skidding. Regarding brake equipment.

(Prior Art) Examples of conventional brake devices include those shown in FIGS. 4 to 11. In FIG. 4, 1 is a brake device, and the brake device 1 is a vehicle to which a skid prevention brake mechanism IA is applied. The skid prevention brake mechanism IA detects a wheel skid based on signals from an actuator 6 provided in the middle of a brake pipe 5 that communicates the master cylinder 2 with the four wheel cylinders 3 of the front and rear wheels, and a wheel rotation sensor 7, and activates the actuator. 6 and a module 8 for controlling 6. The solenoid valve 6A in the actuator 6 is controlled on/off by a signal from the module 8. The anti-skid brake mechanism IA uses this on/off control to control the brake fluid pressure to increase, maintain, decrease, and maintain the brake fluid pressure to adjust the braking force of the wheels during sudden braking or when driving on a road surface with a low coefficient of friction. This prevents the wheels from locking, which can sometimes occur, and maintains appropriate braking conditions.

In such a conventional skid prevention brake mechanism IA, the sudden opening and closing of the solenoid valve in the actuator 6 during pressure increase or decrease, or the pulsation caused by the pressure reduction pump in the wheel side brake piping, Hydraulic pulsation 9a as shown in FIG. 5(a) occurs in the brake piping on the wheel side, and hydraulic pulsation 9a as shown in FIG. 5(b) occurs in the brake piping on the master cylinder side.
) Hydraulic pulsation 9b as shown (referred to as 9 when representing)
Occasionally, vibrations and abnormal noises are generated.

Therefore, in order to reduce the pulsation pressure level of these hydraulic pulsations 9, in -i, an expansion chamber with a larger cross-sectional area than normal brake piping is provided in the middle of the brake piping 5 at a portion where the pulsation pressure is large. Measures are taken to reduce the pulsation constant due to the compressibility of the oil in areas where the pulsation pressure is high, and at the same time disperse the vibrational energy of the oil to reduce the pulsation pressure level.

FIG. 6 is a diagram schematically showing the general hydraulic circuit of the brake system including the actuator 6.
In the brake pipe 5B between the actuator 6 and the master cylinder 2, hydraulic pulsations occur mainly due to the opening and closing of the solenoid valve 11.
In A, hydraulic pulsations are generated mainly by the pump 12 for pressure reduction in the wheel side piping.

As shown in FIGS. 7(a) to 7(f), the hydraulic pulsation 9 occurs in both the brake piping 5B between the actuator 6 and the wheel cylinder 3 and the brake piping 5A between the actuator 6 and the master cylinder 2.
The size of the pulsation on the side is always the largest. For this reason, the 8th
As shown in the figure, the expansion chamber 13 has a connection port 6a of the actuator 6 of the brake pipe 5 connected to the actuator 6.
It is located near the.

FIG. 9 shows a case in which such an expansion chamber 13 is applied to a vehicle brake device, and FIG. 10 shows a detailed configuration of the main parts thereof. In Figure 10, 3-way connector 1
5 is a connection port 6 of the actuator 6 in the middle of the brake pipe 5B between the actuator 6 and the wheel cylinder 3.
It is provided near a and branches off the brake pipe 5B. The expansion chamber 13 is located at the branch port 15a of the three-way connector 15.
A communication pipe 16 that communicates with is connected. 17 is expansion chamber 1
3 is a lid, and 18 is an air bleeder.

(Problem to be Solved by the Invention) However, the cross-sectional area A13 of the expansion chamber 13 is several to several tens of times larger than the cross-sectional area A5 of the brake pipe 5B, and the volume V13 of the brake fluid in the expansion chamber 13 is The amount is not negligible compared to the volume of brake fluid in the entire brake pipe 5. Therefore, during normal brake operation when the anti-skid brake mechanism is not activated, the volume of brake fluid to be operated increases significantly, resulting in a problem in that the rigidity of the entire flake decreases. FIG. 11 shows the volume V13 of the expansion chamber 13 and the increase in master cylinder stroke required to obtain the same pressure. The master cylinder stroke increases in proportion to the increase in the volume V13 of the expansion chamber 13.

This invention was made by focusing on such conventional problems, and the present invention has been made by focusing on the connection port of the actuator of the master-side brake pipe that connects the actuator and the master cylinder, and the wheel-side brake pipe that connects the actuator and the wheel cylinder. A skid prevention brake mechanism is achieved by providing an on-off valve in the middle of the communication pipe that connects to the brake pipe near the brake pipe and communicating the brake pipe and the expansion chamber, and opens the on-off valve only when the skid prevention brake mechanism is activated. This brake stops the operation of the expansion chamber when not in operation to prevent a decrease in rigidity during normal braking, and the anti-skid brake mechanism reduces hydraulic pulsation during operation, suppressing vibrations and noise. The task is to provide equipment.

(Means for Solving the Problem) The brake device according to the present invention is a skid prevention brake mechanism that prevents wheels from skidding by controlling the brake fluid pressure in the brake pipe to increase/maintain and reduce/maintain the pressure. In a brake device having a master side brake piping connecting between the actuator and the master cylinder and a wheel side brake piping connecting the actuator and the wheel cylinder, the master side brake piping and/or the wheel side connecting to the connection port of the actuator. An on-off valve is provided in the middle of a communication pipe that connects the brake pipe near the connection port of the brake pipe and communicates the expansion chamber having an inner diameter larger than the brake pipe with the inside of the brake pipe, and only when the skid prevention brake mechanism is activated. The feature is that the on-off valve is opened.

Further, in the brake device, it is preferable that the opening/closing valve is a solenoid valve, and opening/closing thereof is controlled by a control means connected to a skid prevention brake mechanism.

(Function) The present invention provides an on-off valve in the middle of the communication pipe that communicates the expansion chamber with the brake pipe near the connection port of the master side brake pipe, the eel side brake pipe, and the actuator. 7. I like it because it opens only when it is activated. When the anti-friction brake mechanism is not operating, the on-off valve is closed and the expansion chamber stops operating, eliminating the influence of the expansion chamber and preventing a decrease in the rigidity of the brake fluid. Further, when the skid prevention brake mechanism is activated, the on-off valve is opened and the expansion chamber can be operated, so that the hydraulic pulsation that is about to occur in the brake piping is reduced by the operation of the expansion chamber.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1.2 shows a case where an embodiment of the brake device according to the present invention is applied to a vehicle, and shows its basic configuration. 9th.
The same components as the conventional one shown in FIG. 10 are given the same reference numerals.

In FIG. 1, 21 is a brake device, and the brake device 21 has an actuator 6 of a skid prevention brake mechanism provided in the middle of a brake pipe 5 that communicates the master cylinder 2 and the wheel cylinder 3. Brake piping 5 connects actuator 6 and master cylinder 2
The master brake pipe 5A connects the actuator 6 and the wheel cylinder 3, and the wheel brake pipe 5B connects the actuator 6 and the wheel cylinder 3. The actuator 6 controls the brake fluid pressure in the brake pipe 5 to increase, maintain, decrease, and maintain the brake fluid pressure in the brake pipe 5 by means of a module 8 that detects wheel skids and gaps based on signals from the rotation sensor 7 shown in FIG. to prevent wheel skidding.

25 is a 3-way connector with a valve, and the 3-way connector with a valve 25 is near the connection port 6a of the wheel-side brake pipe 5B that connects to the connection port 6a of the actuator 6, and the brake pipe 5B is located closest to the connection port 6a. The brake pipe 5B is connected to the brake pipe 5B. As shown in FIG. 2, the 3-way connector with valve 25 includes a 3-way connector part 25A that branches the brake pipe 5B, and a solenoid valve part 25B that is an on-off valve that connects to the branch port 25a of the 3-way connector part 25A. It is composed of.

The three-way connector with a valve 25 is integrally formed with a valve body 25b forming a recess connected to the branch port 25a, and a valve camp 25c screwed into the valve body 25b.

The communication pipe 16 communicates the expansion chamber 13 with the branch port 25a of the 3-way connector part 25A branching from the brake pipe 5B, and the solenoid valve part 2 is connected to the expansion chamber 13 in the middle of the communication pipe 6.
5B is provided. The expansion chamber 13 has a larger inner diameter than the brake pipe 5.

The solenoid valve part 25B is the above-mentioned valve body 25.
b, a valve camp 25c, a solenoid 27, a valve 28, an anchor 29, a spring 3o, a valve seat 31, etc. The solenoid 27 is inserted into a recess in the valve body 25b, and a cylindrical spacer A33 and an annular spacer B34 are provided inside the solenoid 27.
is provided. Further inside the spacer A33,
Anchor 29 movable in the axial direction by the magnetic force of solenoid 27 and anchor 29? A valve 28 is provided for this engagement. The tubular valve seat 31 is press-fitted into the shaft hole of the valve cap 25c. The valve 28 is normally pressed against the valve seat 31 by a spring 30, and can open and close the oil passage to the expansion chamber 13 by turning on and off the current flowing through the solenoid 27. The solenoid 27 is connected to a power source through an amplifier 36, and the amplifier 36 is controlled by a controller 37. The controller 37 is adapted to control the flow of current through the solenoid 27. Controller 37 controls the flow of current to solenoid 27 based on actuation signals from the brake pedal and the anti-skid brake mechanism.

In this embodiment, only when the skid prevention brake mechanism is activated, the controller 37 controls the amplifier 36, current flows through the solenoid 27, the valve 28 opens, and the flake piping 5
B communicates with the expansion chamber 13 so that the expansion chamber 13 can operate.

Next, the effect will be explained.

FIG. 3 is a flowchart 1 showing a program for operating the brake device 21 having the three-way flap 25 with a valve, which is controlled by the controller 37.

First, the PI reads whether or not the brake pedal is depressed. At P2, it is determined whether the brake pedal is depressed. When the brake pedal is depressed, the skid prevention brake mechanism (abbreviated as ABS in Figure 3) is activated at P3.
determine whether it is working. When the skid/do prevention brake mechanism is operating, the controller 37 controls the amplifier 36 at P4, and the solenoid 27 is activated by the operation of the amplifier 36.
Flow current and return to P24.

In addition, the controller 37 determines whether the brake pedal is depressed at P2, and if the brake pedal is not depressed, the controller 37 controls the amplifier 36 so that the current of solenoid 1 = -27 is applied at P5. Disconnect from the power supply and exit.

In addition, P3 determines whether ABS is not operating and
When S is not operating, the controller 37 controls the amplifier 36 to cut the current of the solenoid 27 at P6, disconnects the solenoid 27 from the power supply, no current flows through the solenoid 27, and returns to P2.

As described above, in this embodiment, when the brake pedal is depressed, the skid prevention brake mechanism, that is, AB
When S is not activated, no current flows through the solenoid 27, so the anchor 29 is not activated, the valve 28 remains seated on the valve seat 31, and the brake pipe 5B and expansion chamber 13 are closed by the solenoid valve part 25B. It will remain. Therefore, the high-pressure brake device of the master cylinder 2 is directly applied to the wheel cylinder 3, and is not affected by the expansion chamber 13. Therefore, the rigidity of the brake fluid can be maintained sufficiently.

Further, when the brake pedal is depressed and the anti-skid brake mechanism is activated, current flows through the solenoid 27, so a force acting against the spring 30 acts on the anchor 29, and the anchor 29 is moved together with the valve 28 by the spring force of the spring 30. The valve 28 moves away from the valve seat 31 and opens the oil passage to the expansion chamber 13. Therefore, the brake pipe 5B communicates with the expansion chamber 13 at a position where the hydraulic pulsation is large. Therefore, the oil pressure level in the brake pipe 5B is reduced, vibration energy is dispersed, and oil pressure pulsations are significantly reduced.

Also, when removing air, close switch 38 and apply current to solenoid 27, which causes anchor 29 and valve 2
8 to open the solenoid valve section 25B to bleed air.

In this embodiment, a case has been described in which the three-way connector 25 with a valve is provided between the actuator 6 and the wheel cylinder 3, but the present invention is not limited to this embodiment. 2 and 3-way connector with valve 2.
Of course, 5 may be provided.

(Effects) As described above, according to the present invention, the brake in the vicinity of the connection port of the actuator of the master-side brake pipe that connects the actuator and the master cylinder and the wheel-side brake pipe that connects the actuator and the wheel cylinder By installing an on-off valve in the middle of the communication pipe that is connected to the piping and communicating between the brake piping and the expansion chamber, and opening the on-off valve only when the skid/slip prevention brake mechanism is activated, the skid prevention brake mechanism can be prevented. During operation, the operation of the expansion chamber is stopped, eliminating the influence of the expansion chamber and preventing a decrease in rigidity during normal braking.In addition, the anti-skid brake mechanism can reduce hydraulic pulsation during operation, reducing vibration and noise. The occurrence can be suppressed.

[Brief explanation of drawings]

1 to 3 are diagrams showing one embodiment of the brake device according to the present invention, in which FIG. 1 is a basic configuration diagram thereof, FIG. 2 is a sectional view of its main parts, and FIG. 3 is a flowchart showing its operation. It is. 4 to 11 are diagrams showing a conventional brake device, FIG. 4 is an explanatory diagram showing its overall configuration, FIG. 5(a),
(b) is a graph showing the hydraulic pulsation of the brake fluid in the brake piping, and Fig. 6 is a schematic diagram of the hydraulic circuit.
7(a) to (f) are explanatory diagrams showing the positional relationship between the brake piping and the hydraulic pulsation of the brake fluid, respectively. FIG. 8 is an explanatory diagram showing the positional relationship between the brake piping and the expansion chamber. FIG. 9 is a diagram of its basic configuration, FIG. 10 is a sectional view of its essential parts, and FIG. 11 is a graph showing the relationship between the volume of the expansion chamber and the master nodding stroke. 2...Master cylinder, 3...Wheel cylinder, 5.5A, 5B...Brake piping, 6...
・・Actuator, 2nd work・・Brake device, 16・・Communication pipe, 25・・3-way connector with valve (on/off valve)
, 25A...3-way connector part, 25B...
...Solenoid valve section (opening/closing valve).

Claims (2)

[Claims] (1) The master side brake piping that connects the master cylinder and the actuator of the skid prevention brake mechanism that prevents the wheels from skidding by controlling the brake fluid pressure in the brake piping to increase and hold, and reduce and hold the pressure. In the brake device having a wheel-side brake pipe connecting the actuator and the wheel cylinder, the master-side brake pipe connects to the connection port of the actuator and/or the brake pipe connects to the brake pipe near the connection port of the wheel-side brake pipe. A brake device characterized in that an on-off valve is provided in the middle of a communication pipe that communicates the inside of the brake pipe with an expansion chamber having an inner diameter larger than that of the brake pipe, and the on-off valve is opened only when a skid prevention brake mechanism is activated. . (2) The brake device according to claim 1, wherein the opening/closing valve is a solenoid valve, and opening/closing is controlled by a control means connected to a skid prevention brake mechanism.