JP3754662B2 - Brake device for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle brake device, and in particular, a vehicle in which a brake fluid pressure control device provided between the master cylinder and a wheel brake including a pressure sensor for detecting an output fluid pressure of a master cylinder is disposed on a base body. The present invention relates to an improvement of a brake device.
[0002]
[Prior art]
Conventionally, such an apparatus is already known, for example, in Japanese Patent Application Laid-Open No. 11-503689.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional one, the pressure sensor is caulked and coupled to the base, and not only the assembly of the pressure sensor to the base is complicated, but also the recyclability is poor.
[0004]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicle brake device that improves the assembling property and recyclability of the pressure sensor to the base.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a brake fluid pressure control device formed between the master cylinder and a wheel brake including a pressure sensor for detecting an output fluid pressure of the master cylinder is provided in the base. In the vehicle brake device to be disposed, a hydraulic chamber communicating with the master cylinder is formed in a bottomed fitting hole provided in the base and opened on one surface of the base, and an inner end blocking portion of the fitting hole. A pressure sensor formed between them is fluid-tightly fitted, and a retaining member that prevents the pressure sensor from being detached from the fitting hole by engaging the pressure sensor at an outer end portion of the fitting hole. An elastic member that is detachably attached and elastically urges the pressure sensor to engage with the retaining member is provided between the inner end blocking portion of the fitting hole and the pressure sensor. To do.
[0006]
According to the configuration of the invention described in claim 1, the pressure sensor is fitted after the elastic member is inserted into the fitting hole, and further fitted with the pressure sensor pressed so as to compress the elastic member. It is only necessary to attach a retaining member to the outer end portion of the joint hole, the assembly of the pressure sensor to the base can be facilitated and the assemblability can be improved, and the retaining member can be removed from the outer end portion of the fitting hole. By removing, the pressure sensor can be removed from the base body, and recyclability can be improved.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.
[0009]
1 to 3 show an embodiment of the present invention, FIG. 1 is a hydraulic circuit diagram of a vehicle brake device, and FIG. 2 is a cross-sectional view showing a mounting state of a brake hydraulic pressure control device to a base body. FIG. 3 is a cross-sectional view showing a state in which the pressure switch is attached to the base.
[0010]
First, in FIG. 1, a tandem master cylinder M is provided with first and second output ports 1A and 1B for generating brake fluid pressure in accordance with a pedaling force applied to a brake pedal P by a vehicle driver. Wheel brake 2A, right rear wheel wheel brake 2B, right front wheel wheel brake 2C and left rear wheel wheel brake 2D, and first and second individually connected to the first and second output ports 1A and 1B, respectively. A brake fluid pressure control device 4 is provided between the output fluid pressure paths 3A and 3B.
[0011]
The brake hydraulic pressure control device 4 includes normally open solenoid valves 6A and 6B provided between the hydraulic pressure path 20A corresponding to the first output hydraulic pressure path 3A and the left front wheel brake 2A and the right rear wheel brake 2B. And the hydraulic pressure path 20B corresponding to the second output hydraulic pressure path 3B, the normally open electromagnetic valves 6C and 6D provided between the right front wheel brake 2C and the left rear wheel brake 2D, respectively, and the hydraulic pressure path 20A , 20B side check valves 7A, 7B, 7C, 7D connected in parallel to the normally open solenoid valves 6A-6D so as to allow the brake fluid to flow, and first and second output hydraulic pressure paths The first and second reservoirs 8A, 8B individually corresponding to 3A, 3B, and the normally closed provided between the first reservoir 8A and the left front wheel brake 2A and the right rear wheel brake 2B, respectively. The normally closed solenoid valves 9C and 9D, and the first and second reservoirs 8A and 8B provided between the solenoid valves 9A and 9B, the second reservoir 8B, the right front wheel brake 2C and the left rear wheel brake 2D, respectively. The first and second pumps 10A and 10B, the suction side of which is connected to the hydraulic pressure passages 20A and 20B, the common electric motor 11 that drives both pumps 10A and 10B, Discharges of normally closed solenoid valves 12A, 12B and first and second pumps 10A, 10B interposed between the suction sides of the second output hydraulic pressure paths 3A, 3B and the first and second pumps 10A, 10B, respectively. First and second dampers 13A and 13B, first and second pumps 10A and 10B, and first and second hydraulic pressure passages 20A and 20B, respectively. The first and second pumps 10A, 10B and the first and second orifices 14A, 14B provided between the two dampers 13A, 13B, and the first and second pumps 10A, 10B and the first pump 10A, 10B and the first pumps 10A, 10B, respectively. First and second check valves 15A and 15B interposed between the first and second reservoirs 8A and 8B, a pressure sensor 16 attached to the second output hydraulic pressure path 3B, and first and second output hydraulic pressure paths 3A and 3B and regulators 21A and 21B provided between the hydraulic pressure paths 20A and 20B, respectively.
[0012]
The normally closed solenoid valves 12A and 12B are provided between the first and second pumps 10A and 10B and the first and second check valves 15A and 15B and between the hydraulic pressure paths 20A and 20B, respectively.
[0013]
The regulators 21A and 21B include normally-open electromagnetic valves 5A and 5B, one-way valves 18A and 18B, and relief valves 19A, between the first and second output hydraulic pressure paths 3A and 3B and the hydraulic pressure paths 20A and 20B. 19B is connected in parallel.
[0014]
The one-way valves 18A, 18B are connected in parallel to the normally open solenoid valves 5A, 5B so as to allow the brake fluid to flow only from the first and second output hydraulic pressure paths 3A, 3B. The relief valves 19A and 19B are connected in parallel to the normally open solenoid valves 5A and 5B so as to open in response to the hydraulic pressure of the hydraulic pressure paths 20A and 20B becoming a predetermined value or higher.
[0015]
Such regulators 21A and 21B always communicate between the first and second output hydraulic pressure paths 3A and 3B and the hydraulic pressure paths 20A and 20B communicating with the master cylinder M, but the normally closed solenoid valves 12A and 12B. When the valve is opened, the output hydraulic pressure paths 3A, 3B and the hydraulic pressure paths 20A, 20B are shut off, and the hydraulic pressure paths 20A, 20B become higher than a set value in response to the hydraulic pressure of the hydraulic pressure paths 20A, 20B exceeding the set value. It operates so as to release the hydraulic pressure to the master cylinder M side, thereby adjusting the hydraulic pressure in the hydraulic pressure paths 20A and 20B to a set value or less.
[0016]
The pressure sensor 16 detects whether or not the hydraulic pressure is being output from the master cylinder M, that is, whether or not the brake pedal P is being depressed. This is used for controlling the rotational speed of the electric motor 11 according to the output hydraulic pressure of M.
[0017]
By the way, in the brake fluid pressure control device 4, during normal braking in which each wheel is not likely to be locked, the normally open solenoid valves 5A and 5B are demagnetized and opened, and the normally closed solenoid valves 12A and 12B are demagnetized. In the closed state, the normally open solenoid valves 6A to 6D are demagnetized and opened, and the normally closed solenoid valves 9A to 9D are demagnetized and closed. As a result, the master cylinder M and the wheel brakes 2A to 2D communicate with each other and the wheel brakes 2A to 2D and the reservoirs 8A and 8B are disconnected. Accordingly, the brake hydraulic pressure output from the first output port 1A of the master cylinder M acts on the left front wheel brakes and the right rear wheel brakes 2A and 2B via the normally open solenoid valve 5A and the normally open solenoid valves 6A and 6B. To do. The brake fluid pressure output from the second output port 1B of the master cylinder M is the right front wheel brakes 2C, 2D via the normally open solenoid valve 5B and the normally open solenoid valves 6C, 6D. Act on.
[0018]
When the wheel is about to enter the locked state during the brake, the normally open type electromagnetic valve corresponding to the wheel that is about to enter the locked state among the normally open type electromagnetic valves 6A to 6D is excited and closed. In addition, among the normally closed solenoid valves 9A to 9D, the normally closed solenoid valves corresponding to the wheels are excited and opened. As a result, the master cylinder M and the wheel brakes 2A to 2D are disconnected at the portion corresponding to the wheel that is about to enter the locked state, and the wheel brakes 2A to 2D and the reservoirs 8A and 8B are communicated. Therefore, a part of the brake fluid pressure of the wheel that is about to enter the locked state is absorbed by the first reservoir 8A or the second reservoir 8B, and the brake fluid pressure of the wheel that is about to enter the locked state is reduced. Become.
[0019]
When the brake fluid pressure is kept constant, the normally open solenoid valves 6A to 6D are excited and closed, and the normally closed solenoid valves 9A to 9D are demagnetized and closed, whereby the wheel brake 2A. ˜2D is disconnected from the master cylinder M and the reservoirs 8A and 8B.
[0020]
Further, when the brake fluid pressure is increased, the normally open solenoid valves 6A to 6D are demagnetized and opened, and the normally closed solenoid valves 9A to 9D are demagnetized and closed. The cylinder M and the wheel brakes 2A to 2D communicate with each other and the wheel brakes 2A to 2D and the reservoirs 8A and 8B are disconnected.
[0021]
In this manner, the normally open solenoid valves 5A and 5B are demagnetized and opened, and the normally closed solenoid valves 12A and 12B are demagnetized and closed, and the normally open solenoid valves 6A to 6D and the normally closed solenoid valves are closed. By controlling the demagnetization / excitation of the valves 9A to 9D, braking can be performed efficiently without locking the wheels.
[0022]
By the way, during the antilock brake control as described above, the electric motor 11 is rotated, and the first and second pumps 10A and 10B are driven in accordance with the operation of the electric motor 11. Therefore, the first and second pumps are driven. The brake fluid absorbed in the reservoirs 8A and 8B is sucked into the first and second pumps 10A and 10B, and then passes through the first and second dampers 13A and 13B to the first and second output hydraulic pressure paths 3A and 3B. Refluxed. Such recirculation of the brake fluid can prevent an increase in the amount of depression of the brake pedal P due to the absorption of the brake fluid in the first and second reservoirs 8A and 8B. In addition, the pulsation of the discharge pressures of the first and second pumps 10A and 10B is suppressed by the action of the first and second dampers 13A and 13B and the first and second orifices 14A and 14B. The ring is not disturbed.
[0023]
The brake fluid pressure control device 4 can perform side slip control and traction control of the vehicle in a non-brake operation state in addition to the above-described antilock brake control.
[0024]
Thus, for example, during side slip control, the normally open solenoid valves 5A and 5B of the regulators 21A and 21B are excited and closed, and the normally closed solenoid valves 12A and 12B are excited and opened, and the operation of the electric motor 11 is further performed. Thus, the first and second pumps 10A and 10B are driven, and the normally open solenoid valves other than the normally open solenoid valve corresponding to the wheel to be braked among the normally open solenoid valves 6A to 6D are excited and closed. .
[0025]
As a result, both pumps 10A, 10B allow the brake fluid of the master cylinder M to flow from the first and second output ports 1A, 1B to the first and second output hydraulic pressure paths 3A, 3B and the normally closed solenoid valves 12A, 12B. The brake fluid is supplied to the selected wheel brake of the wheel brakes 2A to 2D via the normally open solenoid valve that is open among the normally open solenoid valves 6A to 6D. Is prevented from flowing back to the master cylinder M side because the normally open solenoid valves 5A and 5B are closed.
[0026]
When the hydraulic pressure in the hydraulic pressure passages 20A and 20B on which the discharge hydraulic pressure from the first and second pumps 10A and 10B acts during such side slip control and traction control becomes a set value or more, the relief valves of the regulators 21A and 21B 19A and 19B allow excess hydraulic pressure to escape to the master cylinder M side, so that excessive hydraulic pressure is prevented from acting on the wheel brake on which the brake pressure is applied.
[0027]
Moreover, since the dampers 13A and 13B are interposed between the hydraulic pressure paths 20A and 20B and the orifices 14A and 14B, pulsations generated in the hydraulic pressure paths 20A and 20B due to the operation of the regulators 21A and 21B are absorbed by the dampers 13A and 13B. Therefore, it is possible to suppress the generation of operating noise due to pulsation caused by the operation of the regulators 21A and 21B.
[0028]
In FIG. 2, the brake fluid pressure control device 4 is provided on a base body 22 formed in a block shape by, for example, aluminum alloy or the like, and a normally open electromagnetic valve in which check valves 7 </ b> A to 7 </ b> D are built in the base body 22. 6A to 6B, the normally closed solenoid valves 9A to 9D, and the normally closed solenoid valves 12A, 12B project the solenoid portions 23, 24, 25,. The normally open electromagnetic valve is built in and includes the one-way valves 18A and 18B and the relief valves 19A and 19B so as to constitute the regulators 21A and 21B in cooperation with the one-way valves 18A and 18B and the relief valves 19A and 19B. Although not shown, the valves 5A and 5B are aligned with the normally closed solenoid valves 12A and 12B with their solenoid portions protruding from the one surface 22a of the base body 22. It is attached to the substrate 22 in the.
[0029]
The electric motor 11 is attached to the other surface 22 b of the base 22, and the first and second pumps 10 </ b> A and 10 </ b> B driven by the electric motor 11 are built in the base 22. The first and second reservoirs 8A and 8B are provided on the base 22 so that a part of the first and second reservoirs 8A and 8B protrudes from the one surface 22a, and the first and second check valves 15A and 15B include the first and second reservoirs 8A and 8B. 8B and the first and second pumps 10A, 10B are provided on the base 22 so as to be interposed between the first and second pumps 10A, 10B. The first and second dampers 13A, 13B and the first and second orifices 14A, 14B are shown in the figure. Although not, it is built in the substrate 22.
[0030]
In FIG. 3, one end of the housing 27 of the pressure sensor 16 is closed to the bottomed fitting hole 28 provided in the base 22 so as to open on one surface 22 a of the base 22. An annular seal member 30 is fitted on the outer periphery of the housing 27 so as to elastically contact the entire inner periphery of the fitting hole 28. .
[0031]
The hydraulic chamber 29 houses a coil spring 31 as an elastic member that is contracted between the closed end of the fitting hole 28 and the housing 27. On the other hand, for example, a C-shaped retaining ring 32 as a retaining member is mounted on the inner surface of the outer end portion of the fitting hole 28, and the retaining ring 32 is engaged with a flange portion 27a provided in the middle portion of the housing 27 in the axial direction. As a result, the housing 27, that is, the pressure sensor 16 is prevented from being detached from the fitting hole 28, and the pressure sensor 16 causes the other end of the housing 27 to protrude from the one surface 22a of the base 22. It is positioned and arranged on the one surface 22a side.
[0032]
A passage 33 communicating with the hydraulic pressure chamber 29 is provided in the base body 22, and this passage 33 is connected to a second output hydraulic pressure passage 3B connected to the master cylinder M (see FIG. 1). That is, the pressure sensor 16 is fluid-tightly fitted into the fitting hole 28 so as to form a hydraulic chamber 29 communicating with the master cylinder M between the inner end closed portion of the fitting hole 28, and The output hydraulic pressure is detected by the pressure sensor 16.
[0033]
Moreover, the elastic force of the coil spring 31 causes the pressure sensor 16 to engage the C-shaped retaining ring 32 against the negative pressure generated in the hydraulic chamber 29 when the master cylinder M returns from the operating state to the non-operating state. A value for maintaining the state, for example, 34.3N is set.
[0034]
On one surface 22 a of the base 22, a second resin molded body 36 that closes one end opening of the first resin molded body 35 is vibration welded to one end of the first resin molded body 35 formed in a cylindrical shape having a rectangular cross section. The cover 37 thus formed is fastened. The cover 37 is normally open electromagnetic valve 6A～6 D of the solenoid portion 23 ..., the solenoid portion of the normally closed electromagnetic valves 9A-9D 24 ..., the normally closed electromagnetic valves 12A, 12B of the solenoid unit 25 ... and the normally open A storage chamber 38 is formed between the base 22 and the solenoid parts of the electromagnetic valves 5A and 5B, and a part of the first and second reservoirs 8A and 8B and a part of the pressure sensor 16 are accommodated. In this manner, the base 22 is fastened to the one surface 22a. In addition, an endless seal member 39 that elastically contacts one surface 22a of the base 22 is attached to the edge of the cover 37 on the base 22 side.
[0035]
The middle portion of the first resin molded body 35 in the cover 37, the normally open electromagnetic valve 6A～6 D of the solenoid portion 23 ..., the solenoid portion of the normally closed electromagnetic valves 9A-9D 24 ..., normally closed solenoid valve A planar wall 43 having rectangular openings 40... 41... 42 individually corresponding to the solenoids 25... Of 12 A and 12 B and the solenoids of the normally open solenoid valves 5 A and 5 B, respectively. 22 is formed integrally so as to face one surface 22a.
[0036]
The front end of each solenoid part 23 ..., 24 ..., 25 ... is inserted into the opening 40 ..., 41 ..., 42 ..., and the solenoid valve protrudes one pair from each solenoid part 23 ..., 24 ..., 25 ... The side connection terminals 44... 45... 46 are projected so as to extend upward in the openings 40.
[0037]
The wall 43 includes conductive metals corresponding to the normally open solenoid valves 6A to 6D, the normally closed solenoid valves 9A to 9D, the normally open solenoid valves 5A and 5B, and the normally closed solenoid valves 12A and 12B, respectively. Individual bus bars (not shown) made of a single conductive metal corresponding to the solenoid valves 6A to 6D, 9A to 9D, 5A, 5B, 12A and 12B in common (not shown) Is buried.
[0038]
One of the solenoid valve side connection terminals 44 ..., 45 ..., 46 ... is electrically connected to individual bus bar side connection terminals 47 ..., 48 ..., 49 ... formed at one end of each individual bus bar, respectively. A plurality of common bus bar side connection terminals (not shown) formed on the common bus bar are electrically connected to the other of the solenoid valve side connection terminals 44..., 45.
[0039]
Three pressure sensor side connection terminals 50 are projected from the other end of the housing 27 in the pressure sensor 16. On the other hand, the wall portion 43 of the cover 37 is provided with an opening 51 corresponding to the other end of the housing 27, and the pressure sensor side connection terminals 50... Extend upward in the opening 51. It protrudes from the other end of the housing 27. Moreover, three conductive metal bus bars 52 corresponding to the pressure sensor 16 are embedded in the wall 43, and the bus bar side connection terminals 53 formed at one end of each bus bar 52 are connected to the pressure sensor side. Electrically connected to terminals 50.
[0040]
A substrate 54 on which an electric circuit is provided is disposed in the cover 37 above the wall portion 43, and the substrate 54 is fixed on a plurality of support boss portions 55... Projecting from the wall portion 43. Supported by
[0041]
Thus, the individual bus bar and the common bus bar corresponding to the normally open solenoid valves 6A to 6D, the normally closed solenoid valves 9A to 9D, the normally open solenoid valves 5A and 5B, and the normally closed solenoid valves 12A and 12B are the substrate 54. Electrically connected to the above electrical circuit. The other ends of the bus bars 52 corresponding to the pressure sensor 16 are electrically connected to an electric circuit on the substrate 54 so as to penetrate the substrate 54.
[0042]
Next, the operation of this embodiment will be described. The base 22 on which the brake hydraulic pressure control device 4 including the pressure sensor 16 is provided is provided with a bottomed fitting hole 28 opened on one surface 22a thereof. The housing 27 of the pressure sensor 16 is formed with a fluid pressure chamber 29 communicating with the master cylinder M between the inner end closed portion of the fitting hole 28 and is fluid-tightly fitted into the fitting hole 28. A C-shaped retaining ring 32 that prevents the pressure sensor 16 from being detached from the fitting hole 28 by engaging with the flange portion 27a of the housing 27 is detachably attached to the outer end portion of the housing 27, and the flange portion 27a is attached. A coil spring 31 is provided between the inner end blocking portion of the fitting hole 28 and the pressure sensor 16 for elastically biasing in a direction to engage the C-shaped retaining ring 32.
[0043]
Therefore, when the pressure sensor 16 is attached to the base 22, the pressure sensor 16 is fitted after the coil spring 31 is inserted into the fitting hole 28, and the pressure sensor 16 is pressed so as to compress the coil spring 31. A C-shaped retaining ring 32 may be attached to the outer end portion of the joint hole 28, and the assembly of the pressure sensor 16 to the base 22 can be facilitated and the assemblability can be improved. Moreover, by removing the C-shaped retaining ring 32 from the outer end portion of the fitting hole 28, the pressure sensor 16 can be removed from the base 22, and the recyclability can be improved.
[0044]
The elastic force of the coil spring 31 is such that the pressure sensor 16 is engaged with the C-shaped retaining ring 32 against the negative pressure generated in the hydraulic chamber 29 when the master cylinder M returns from the operating state to the non-operating state. Since the state is set to a value that maintains the state, the pressure sensor 16 does not rattle in the fitting hole 28 even if the hydraulic chamber 29 becomes negative pressure, and the pressure sensor side connection terminal 50 provided in the pressure sensor 16. .. And an excessive load does not act on the connection portion between the bus bar side connection terminals 53.
[0045]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.
[0046]
【The invention's effect】
As described above, according to the first aspect of the present invention, the assembly of the pressure sensor to the base body can be facilitated, the assemblability can be improved, and the recyclability can be improved.
[Brief description of the drawings]
FIG. 1 is a hydraulic circuit diagram of a vehicle brake device.
FIG. 2 is a cross-sectional view showing a state in which a brake fluid pressure control device is attached to a base body.
FIG. 3 is a cross-sectional view showing a state in which the pressure switch is attached to the base body.
[Explanation of symbols]
2A, 2B, 2C, 2D ... wheel brake 4 ... brake fluid pressure control device 16 ... pressure sensor 22 ... base 22a ... one side 28 of base ... fitting hole 29 ... Hydraulic chamber 31 ... Coil spring 32 as an elastic member ... C-shaped retaining ring M as a retaining member M ... Master cylinder

Claims (1)

A brake fluid pressure control device (4) provided between the master cylinder (M) and the wheel brakes (2A, 2B, 2C, 2D) including a pressure sensor (16) for detecting the output fluid pressure of the master cylinder (M). However, in the vehicle brake device disposed on the base body (22), the bottomed fitting hole (28) provided in the base body (22) opens to one surface (22a) of the base body (22), and A pressure sensor (16) that forms a hydraulic pressure chamber (29) communicating with the master cylinder (M) between the inner end closed portion of the fitting hole (28) is fitted in a fluid-tight manner, and the fitting hole ( 28) A retaining member (32) is detachably mounted on the outer end of the pressure sensor (16) to prevent the pressure sensor (16) from being detached from the fitting hole (28) by engaging with the pressure sensor (16). The pressure sensor (16) is connected to the retaining member (32). Elastic member (31) for resiliently urging in the direction of engagement is an inner end closure and said pressure sensor (16) for a vehicle brake equipment, characterized in that provided between the fitting hole (28).

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