JPH10138899A - Antilock brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antilock brake device which increases the volume of a damper chamber and is still miniaturized. SOLUTION: An antilock brake device is provided with a main path 4 for guiding liquid pressure from a master cylinder to a wheel cylinder and a return path 7 for communication the wheel cylinder with a reservoir in a housing having a mount insulator fitted thereto. It is also provided with a normally opened type pressure intensifying solenoid valve 5 for opening/closing the main path 4, a normally closed type pressure reducing solenoid valve 8 for opening/ closing the return path 7, a pump device 9 for pumping up a brake liquid in the reservoir and returning it to the master cylinder via a damper chamber 11, and a motor 10 for driving the pump device 9. A projecting part 17 extending from the side fitted to the motor 10 in the approximately same direction as the axial direction of the motor 10 is provided in the housing and an auxiliary damper chamber 23 communicated with the damper chamber 11 is formed on the projecting part 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antilock brake device for controlling a vehicle brake fluid pressure.

[0002]

2. Description of the Related Art Conventionally, there is known an anti-lock brake device for controlling a brake fluid pressure of a vehicle in order to prevent a wheel from being locked during braking of the vehicle. As shown in FIG. 3, for example, the anti-lock brake device includes a master cylinder 2 that generates a brake hydraulic pressure in accordance with a depression force applied to a brake petal 1, and a main cylinder 2 that guides the hydraulic pressure of the master cylinder 2 to a wheel cylinder 3. A passage 4, a normally-open type pressure-intensifying solenoid valve 5 provided in the middle of the main passage 4, and a return passage 7 for communicating the wheel cylinder 3 with the reservoir 6.
A normally closed pressure reducing solenoid valve 8 provided in the middle of the return passage 7, a pump device 9 for pumping up the brake fluid in the reservoir 6 and returning it to the master cylinder 2, and a motor for driving the pump device 9 10 and a damper chamber 11 provided between the pump device 9 and the master cylinder 2.

If the wheels are likely to be locked during the braking operation by depressing the brake pedal 1, the pressure-increasing solenoid valve 5 is closed and the pressure-reducing solenoid valve 8 is opened.
The hydraulic pressure in the wheel cylinder 3 is caused to flow into the reservoir 6 through the return passage 7, and the hydraulic pressure in the wheel cylinder 3 is controlled to be reduced to avoid locking the wheels. The hydraulic fluid flowing into the reservoir 6 is pumped out by a pump device 9 and returned to the master cylinder 2 via a damper chamber 11.

In the anti-lock brake device, each device such as the pressure-increasing solenoid valve 5, the pressure-reducing solenoid valve 8, the reservoir 6, the pump device 9, the motor 10 and the like is connected to the damper chamber 11, the main passage 4, the return passage 7, and the like. The housing 12 is attached to the formed housing 12 to form a unit, and the housing 12 is attached to an engine room or the like of a vehicle via a mount insulator. A similar configuration is described in, for example,
No. 7947.

[0005]

The damper chamber 11 formed in the housing 12 absorbs and attenuates a pulse pressure generated when the pump device 9 operates, thereby reducing vibration. In order to increase the
It is effective to increase the volume of the fuel cell.

However, the antilock brake device is required to be miniaturized in order to arrange it in a narrow engine room. In order to increase the volume of the damper chamber 11, the size of the housing 12 must be increased. Has limitations.

Conversely, if it is intended to form a large-volume damper chamber in the housing without increasing the dimensions of the housing 12, mounting positions of various devices such as the solenoid valves 5 and 8 mounted on the housing 12 can be improved. Needs to be changed, and the arrangement of various devices with respect to the housing 12 is restricted. As a result, it may be difficult to make the antilock brake device compact and compact.

The present invention has been devised in view of such a conventional situation, and can increase the volume of a damper chamber.
It is another object of the present invention to provide an antilock brake device that can be downsized.

[0009]

SUMMARY OF THE INVENTION In view of the above, the present invention is directed to a housing in which a mount insulator is mounted, a main passage for guiding hydraulic pressure of a master cylinder to a wheel cylinder, and a return for communicating the wheel cylinder with a reservoir. A normally-open type pressure-intensifying solenoid valve that opens and closes the main passage, a normally-closed pressure-reducing solenoid valve that opens and closes the return passage, and pumps up brake fluid in the reservoir through a damper chamber. An anti-lock brake device in which a pump device for returning to the master cylinder and a motor for driving the pump device are respectively mounted on the housing, the protrusion extending from the side on which the motor is mounted in a direction substantially the same as the axial direction of the motor. Part, and on this protruding part,
The structure is such that a sub-damper chamber communicating with the damper chamber is formed.

According to a second aspect of the present invention, in the configuration of the first aspect, the axial dimension of the projecting portion is shorter than the axial dimension of the motor projecting from the housing. .

According to a third aspect of the present invention, in the configuration of the first aspect, the damper chamber and the sub-damper chamber communicate with each other via an orifice having a predetermined size.

According to this configuration, a protrusion is provided on the side of the housing on which the motor is mounted, and the protrusion extends substantially in the same direction as the axial direction of the motor, and the protrusion has a sub-damper chamber communicating with the damper chamber. As a result, the volume of the damper chamber and the volume of the sub-damper chamber are added, and the volume of the damper chamber that performs the damping function is substantially increased.

By increasing the volume of the damper chamber, the effect of absorbing and attenuating the pulsation of the hydraulic fluid generated by the pump or the like is enhanced, and the vibration is effectively reduced.

Also, when increasing the volume of the damper chamber, the housing is not substantially enlarged.

That is, forming a large-volume damper chamber in the housing near the motor mounted without providing the protruding portion is achieved by forming a hydraulic passage in the housing and mounting various devices. Where this is difficult, the present invention can advantageously solve this by effectively utilizing the space near the motor, and as a result, without substantially enlarging the housing, The volume can be increased.

Thus, the volume of the damper chamber can be substantially increased by adding the volume of the sub-damper chamber, and various devices such as solenoid valves can be efficiently mounted on the housing, that is, the outer dimensions can be reduced. It is possible to arrange so as to be the smallest.

Therefore, an antilock brake device which can increase the volume of the damper chamber and can be downsized is obtained.

According to the second aspect of the present invention, since the dimension of the projecting portion is set shorter than the axial dimension of the motor projecting from the housing, the anti-lock brake device is provided by providing the projecting portion. The overall axial dimension does not increase.

According to the third aspect of the present invention, since the damper chamber and the sub-damper chamber communicate with each other through the orifice, the pulsation that absorbs and attenuates in the sub-damper chamber by selecting the diameter of the orifice. The frequency range can be tuned, and the pulsation can be more effectively absorbed and attenuated.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. The same components as those shown in FIG. 3 will be described with the same reference numerals.

FIG. 1 is a sectional view showing a part of an antilock brake device according to an embodiment of the present invention, and FIG. 2 is a left side view of FIG. In this embodiment, the housing indicated by reference numeral 12 is formed in a substantially rectangular parallelepiped shape as a whole.

The main passage 4 for guiding hydraulic pressure of a master cylinder (not shown) to the wheel cylinder is provided in the housing 12.
A return passage 7 communicating a wheel cylinder (not shown) and the reservoir 6 is formed, and a normally-open type pressure-intensifying solenoid valve 5 provided in the main passage 4 and a return passage 7 provided in the middle of the return passage 7. A closed type decompression solenoid valve 8, a pump device 9 for pumping up brake fluid in a reservoir (not shown) and returning it to a master cylinder via a damper chamber 11, and a motor 10 for driving the pump device 9 are respectively mounted. . The motor 10 is attached to the housing 12 by the motor 10
Is fixed to one side of the housing 12 with screws 10b.

The motor 10 has a substantially cylindrical appearance, and the motor 10 is mounted on one side of a rectangular parallelepiped housing 12, that is, substantially at the center of one side having a substantially rectangular shape. Therefore, the motor 1 of the housing 12
A flat area remains at the corner of one side where 0 is attached (see FIG. 2).

The damper chamber 11 is formed by sealing an open end of a blind hole 11 a having one end sealed with a plug 14 under sealing with a seal member 13. The plug 14 is urged toward the open end of the blind hole 11 a by a spring member 15, and is prevented from being pulled out from the open end by a retaining ring 16.

Reference numeral 17 denotes a prism-shaped protrusion provided on the housing 12. The protrusion 17 is provided in the housing 1.
The second motor 10 is formed in a flat area remaining at a corner on one side surface of the motor 10 so as to extend from the side where the motor 10 is mounted in substantially the same direction as the axial direction of the motor 10. The axial dimension) is formed shorter than the axial dimension of the motor 10 protruding from the housing 12.

Reference numeral 23 denotes a sub-damper chamber formed in the projection 17. The sub-damper chamber 23 is formed by sealing an open end of a blind hole 23 a having one end sealed with a plug 25 under sealing with a seal member 24. In addition,
The plug 25 is prevented from being pulled out by a caulking 23b provided at the opening end of the blind hole 23a.

The sub-damper chamber 23 communicates with the damper chamber 11 via a communication passage 26.
A plug 28 having an orifice 27 of a predetermined size is inserted and fixed. Therefore, the damper chamber 11 and the sub-damper chamber 23 communicate with each other through the orifice 27 having a predetermined size.

Reference numeral 29 denotes a mount insulator mounted on the housing 12. A plurality of mount insulators 29 are mounted on the mount insulator 29, and are used for mounting an antilock brake device in an engine room of a vehicle.

That is, the mount insulator 29
Is composed of an annular mount rubber 30 attached to the housing 12, a fixing member 31 inserted into the mount rubber 30, and a mounting bolt 32 screwed to the fixing member 31. To
After being inserted into a bracket (not shown) mounted in the engine room of the vehicle and screwed to the fixing member 31, mounting of the anti-lock brake device in the engine room via the mount insulator 29 is achieved.

According to such a configuration, the housing 12
A protrusion 1 extending substantially in the same direction as the axial direction of the motor 10 is provided in a region remaining at a corner of one side surface on which the motor 10 is mounted.
7 is formed, and the auxiliary damper chamber 23 communicating with the damper chamber 11 is formed in the protruding portion 17, so that the capacity of the damper chamber 11 and the capacity of the sub-damper chamber 23 are added, and the damper chamber 1 is added.
1 will be substantially increased.

As the volume of the damper chamber 11 increases, the effect of absorbing and attenuating the pulsation of the hydraulic fluid generated in the pump 9 and the like is enhanced, and the vibration is effectively reduced.

Further, when increasing the volume of the damper chamber 11, the housing 12 is not substantially enlarged.

That is, when the protrusion 17 is not provided, the surface of the housing 12 near the motor 10 has a flat area as described above, but has a hydraulic passage therein. Due to the formation of 4, 7 and the like, it is difficult to provide a large-volume damper chamber 11 in that part, and this part is a so-called dead space and cannot be used. The sub-damper chamber 23 is formed by effectively utilizing the space near the motor 10, and the volume of the damper chamber 11 can be increased without substantially increasing the size of the housing 12.

Thus, the volume of the damper chamber 11 can be substantially increased by adding the volume of the sub-damper chamber 23, and various devices such as the solenoid valves 5, 8 can be efficiently mounted on the housing 12. In other words, the arrangement can be made such that the outer dimensions are minimized.

Accordingly, an antilock brake device capable of increasing the volume of the damper chamber 11 and reducing its size can be obtained.

The dimension of the projection 17 is set shorter than the dimension of the motor 10 projecting from the housing 12 in the direction of its own axis. The size does not increase.

The damper chamber 11 and the sub-damper chamber 23
Are communicated through the orifice 27, so that the diameter of the orifice 27 is selected so that the secondary damper chamber 2
It is possible to tune the frequency range of the pulsation that absorbs and attenuates in 3, and it is possible to more effectively absorb and attenuate the pulsation.

That is, the overall level of pulsation is reduced by the damper chamber 11, and pulsation in a specific frequency range is absorbed and attenuated by the sub-damper chamber 23 arranged in parallel with the damper chamber 11. In this case, by selecting the diameter of the orifice 27, a frequency range mainly borne by the sub damper chamber 23 can be selected, and vibration can be effectively reduced.

The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration is not limited to this, and can be changed without departing from the gist of the invention. For example, the embodiment in which the damper chamber 11 and the sub-damper chamber 23 communicate with each other through the orifice 27 by inserting and fixing a plug 28 having an orifice 27 in the communication passage 26 has been described. A configuration may be adopted in which the communication passage 26 itself is used as an orifice and the diameter of the communication passage 26 is arbitrarily selected.

[0040]

As described above in detail, according to the present invention, an antilock brake device capable of increasing the volume of the damper chamber and reducing the size can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a part of an antilock brake device according to an embodiment of the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is an explanatory diagram showing an overall configuration of an antilock brake device.

[Explanation of symbols]

 Reference Signs List 4 Main passage 5 Pressure increasing solenoid valve 7 Return passage 8 Pressure reducing solenoid valve 9 Pump device 10 Motor 11 Damper chamber 12 Housing 17 Projecting part 23 Secondary damper chamber 27 Orifice

Claims (3)

[Claims] A main passage for guiding the hydraulic pressure of a master cylinder to a wheel cylinder and a return passage for connecting a wheel cylinder to a reservoir are formed in a housing in which a mount insulator is mounted, and a main passage for opening and closing the main passage is formed. An open-type pressure-increasing solenoid valve, a normally-closed pressure-reducing solenoid valve that opens and closes the return passage, a pump device that pumps up brake fluid in the reservoir and returns the master cylinder to the master cylinder via a damper chamber, In the anti-lock brake device in which a motor to be mounted is mounted, the housing is provided with a protruding portion extending in a direction substantially the same as the axial direction of the motor from the side on which the motor is mounted, and the protruding portion communicates with the damper chamber. An anti-lock brake device comprising a sub-damper chamber. 2. The antilock brake device according to claim 1, wherein an axial dimension of the projecting portion is shorter than an axial dimension of the motor projecting from the housing. 3. The anti-lock brake device according to claim 1, wherein the damper chamber and the sub-damper chamber communicate with each other through an orifice having a predetermined size.