JP2012086687A - Vehicle brake device and air bleed method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable air bleeding of a stroke simulator without needing any special pressure feeding device which performs pressure feeding of brake fluid in a brake device equipped with a stroke simulator.SOLUTION: The stroke simulator 35 includes: a piston 38 driven by the brake fluid pressure transferred through supply side liquid paths Ra and Rb from a master cylinder 11; a back chamber 70 formed behind the piston 38; discharge side liquid paths Rc and Rd which connect the back chamber 70 to a reservoir 20; bypass liquid paths Re and Rf, which bypasses piston 38 and back chamber 70, and which connects the supply side liquid paths Ra, Rb with the discharge side liquid paths Rc and Rd; and an on-off valve 71 for cutting off the bypass liquid paths Re and Rf. Accordingly, the brake fluid is made to circulate from the master cylinder 11 to the reservoir 20 by operating a brake pedal 12 while the on-off valve 71 is opened, and the air collected in the stroke simulator 35 can be discharged to the reservoir 20 without a pressure feeding device of the brake fluid.

Description

  The present invention relates to a back-up fluid pressure generating source that generates a brake fluid pressure by operating a brake pedal, and according to an operation amount of the brake pedal in a state where communication between the back-up fluid pressure generating source and the wheel cylinder is cut off. An electric hydraulic pressure generating source for electrically generating a brake hydraulic pressure, and a brake fluid supplied from the backup hydraulic pressure generating source through a supply-side liquid path when the electric hydraulic pressure generating source is operated. The present invention relates to a vehicular brake device including a stroke simulator that absorbs and applies an operation reaction force to the brake pedal, and an air bleeding method for the brake device.

  If air remains in the piping etc. when filling the brake system for a vehicle for which assembly has been completed, the rise of the brake fluid pressure during braking is reduced due to the compressibility of the air. It is necessary to vent the air to remove the air. Conventionally, in order to perform such air bleeding, for example, as described in Patent Document 1 below, the inside of the brake device is evacuated to remove the air, and then the brake device is braked inside the brake device using a pressure feeding device. The liquid is pumped.

JP 2010-070153 A

  By the way, if the above-mentioned pumping device can be abolished, it is possible to easily release the air from the brake device. However, in a brake device having a conventional structure, if the pumping device is abolished, the air can be reliably vented. In other words, air may remain inside the piping.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a brake apparatus equipped with a stroke simulator, which can release the air from the stroke simulator without requiring a special pumping apparatus for pumping brake fluid. And

  In order to achieve the above object, according to the invention described in claim 1, a backup hydraulic pressure generating source that generates a brake hydraulic pressure by operating a brake pedal, the backup hydraulic pressure generating source, a wheel cylinder, An electrical hydraulic pressure generation source that electrically generates a brake hydraulic pressure corresponding to the amount of operation of the brake pedal in a state in which the communication of the brake pedal is cut off, and when the electrical hydraulic pressure generation source is activated, the backup hydraulic pressure A vehicular brake device comprising a stroke simulator that absorbs brake fluid supplied from a generation source via a supply side fluid path and applies an operation reaction force to the brake pedal, wherein the stroke simulator includes the backup A piston driven by a brake fluid pressure from a hydraulic fluid source, a back chamber formed on the back of the piston, and a reservoir for the back chamber A discharge-side liquid path connected to the pipe, a bypass-liquid path that bypasses the piston and the back chamber and connects the supply-side liquid path and the discharge-side liquid path, and a blocking means that blocks the bypass-liquid path A vehicle brake device is proposed.

  According to the invention described in claim 2, in addition to the structure of claim 1, the vehicular brake device is characterized in that the shut-off means is configured by an on-off valve that can be manually opened and closed. Proposed.

  According to a third aspect of the invention, in addition to the configuration of the first or second aspect, the blocking means includes a sealing means for preventing the bypass liquid passage from being released to the atmosphere. A vehicle brake device is proposed.

  According to the invention described in claim 4, in addition to the structure of claim 3, the sealing means is configured to prevent the bypass liquid passage from being opened to the atmosphere regardless of the open / closed state of the blocking means. A vehicle brake device is proposed.

  According to the fifth aspect of the present invention, the backup hydraulic pressure generating source that generates the brake hydraulic pressure by operating the brake pedal, and the communication between the backup hydraulic pressure generating source and the wheel cylinder are cut off. An electrical hydraulic pressure generation source that electrically generates a brake hydraulic pressure in accordance with the amount of operation of the brake pedal, and a supply-side fluid path from the backup hydraulic pressure generation source when the electrical hydraulic pressure generation source is activated An air venting method for a vehicle brake device comprising a stroke simulator that absorbs brake fluid supplied via a stroke and applies an operation reaction force to the brake pedal, wherein the back chamber is formed on the back portion of the piston Connecting a drain side fluid passage connecting the reservoir to the reservoir and the supply side fluid passage through a bypass fluid passage, and connecting the back-up fluid pressure generating source to the straw A step of operating the brake pedal in a state connected to the simulator, the air bleeding method for a vehicle brake system, which comprises a step of blocking said bypass fluid passage is proposed.

  The master cylinder 11 of the embodiment corresponds to the backup hydraulic pressure generation source of the present invention, the slave cylinder 42 of the embodiment corresponds to the electrical hydraulic pressure generation source of the present invention, and the on-off valve of the embodiment. 71 corresponds to the blocking means of the present invention, and the O-ring 74 of the embodiment corresponds to the sealing means of the present invention.

  According to the configuration of the first aspect of the present invention, the brake fluid pressure generated by the electrical fluid pressure generation source that operates according to the amount of operation of the brake pedal of the driver is supplied to the wheel cylinder during normal operation to perform braking. When the pressure generating source fails, braking is performed by supplying the brake hydraulic pressure generated by the backup hydraulic pressure generating source activated by the driver's operation of the brake pedal to the wheel cylinder. When the electrical hydraulic pressure generating source is activated, the stroke simulator absorbs the brake fluid supplied from the backup hydraulic pressure generating source via the supply side fluid passage and applies an operation reaction force to the brake pedal.

  The stroke simulator includes a piston driven by brake hydraulic pressure from a backup hydraulic pressure source, a back chamber formed on the back of the piston, a discharge side fluid passage connecting the back chamber to the reservoir, and the piston and the back chamber. The bypass liquid path for connecting the supply-side liquid path and the discharge-side liquid path by bypassing and the blocking means for blocking the bypass liquid path are provided. By operating the brake pedal while connected to the reservoir via the bypass fluid path and the discharge side fluid path, the brake fluid can be circulated from the backup fluid pressure source to the reservoir without the need for a brake fluid pumping device. The air accumulated in the stroke simulator can be discharged to the reservoir.

  According to the second aspect of the present invention, since the shut-off means is composed of an on-off valve that can be manually opened and closed, the shut-off means can be opened and closed without being affected by the state of the power source.

  According to the third aspect of the present invention, since the shut-off means includes a sealing means for preventing the bypass fluid passage from being released to the atmosphere, the brake simulator can be prevented from leaking from the bypass passage and the stroke simulator can be operated reliably. Can do.

  According to the fourth aspect of the present invention, since the sealing means prevents the bypass liquid passage from being opened to the atmosphere regardless of the open / close state of the shut-off means, air is prevented from being mixed into the stroke simulator when the open / close valve is opened / closed. can do.

  According to the fifth aspect of the present invention, the brake fluid pressure generated by the electrical fluid pressure generating source that operates in accordance with the amount of operation of the brake pedal by the driver is supplied to the wheel cylinder at normal times for braking. When the hydraulic pressure generation source fails, braking is performed by supplying the brake hydraulic pressure generated by the backup hydraulic pressure generation source activated by the driver's operation of the brake pedal to the wheel cylinder. When the electrical hydraulic pressure generating source is activated, the stroke simulator absorbs the brake fluid supplied from the backup hydraulic pressure generating source via the supply side fluid passage and applies an operation reaction force to the brake pedal.

  The supply-side fluid passage that connects the back-up fluid pressure source to the stroke simulator and the discharge-side fluid passage that connects the back chamber formed on the back of the piston to the reservoir are connected via a bypass fluid passage. Since the bypass fluid path is shut off after the brake pedal is operated with the source connected to the stroke simulator, the brake fluid is circulated from the back-up fluid pressure source to the reservoir, and the stroke can be achieved without the need for a brake fluid pumping device. Air accumulated in the simulator can be discharged to the reservoir.

Hydraulic circuit diagram of vehicle brake device (when power is OFF). The block diagram of a control system. 3 is an enlarged view of part 3 of FIG. Action | operation explanatory drawing at the time of normal braking. Action | operation explanatory drawing at the time of abnormality (at the time of power failure). Action | operation explanatory drawing at the time of air bleeding.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, a tandem master cylinder 11 includes a first piston 14 connected to a brake pedal 12 operated by a driver via a push rod 13, and a second piston 15 disposed in front of the first piston 14. A first fluid pressure chamber 17 in which a return spring 16 is accommodated between the first piston 14 and the second piston 15, and a second fluid in which a return spring 18 is accommodated in front of the second piston 15. A pressure chamber 19 is defined. The first hydraulic pressure chamber 17 and the second hydraulic pressure chamber 19 that can communicate with the reservoir 20 include a first output port 21 and a second output port 22, respectively. The first output port 21 has the fluid paths Pa, Pb, VSA. (Vehicle Stability Assist) Connected to, for example, the wheel cylinders 26 and 27 (first system) of the left and right rear wheel disc brake devices 24 and 25 via the device 23 and the liquid passages Pc and Pd, The two output ports 22 are connected to the wheel cylinders 30, 31 (second system) of the disc brake devices 28, 29 on the left and right front wheels, for example, via the fluid paths Qa, Qb, the VSA device 23 and the fluid paths Qc, Qd. .

  In the present specification, the upstream side of the fluid paths Pa to Pd and the fluid paths Qa to Qd means the master cylinder 11 side, and the downstream side means the wheel cylinders 26, 27; 30, 31 side. To do.

  A first master cut valve 32 that is a normally open solenoid valve is disposed between the liquid paths Pa and Pb, and a second master cut valve 33 that is a normally open solenoid valve is disposed between the liquid paths Qa and Qb. The supply side liquid paths Ra and Rb branched from the liquid path Qa on the upstream side of the second master cut valve 33 are connected to a stroke simulator 35 via a simulator valve 34 which is a normally closed electromagnetic valve. The stroke simulator 35 is a cylinder 36 in which a piston 38 urged by a spring 37 is slidably fitted, and a hydraulic chamber 39 formed on the side opposite to the spring 37 of the piston 38 has a supply side liquid path Rb. Communicate with.

  A tandem slave cylinder 42 is connected to the liquid passage Pb and the liquid passage Qb on the downstream side of the first and second master cut valves 32 and 33. The actuator 43 that operates the slave cylinder 42 transmits the rotation of the electric motor 44 to the ball screw mechanism 46 through the gear train 45. The cylinder body 47 of the slave cylinder 42 is slidably fitted with a first piston 48A driven by a ball screw mechanism 46 and a second piston 48B positioned in front of the first piston 48A. A first hydraulic pressure chamber 50A in which a return spring 49A is accommodated is defined between the second pistons 48B, and a second hydraulic pressure chamber 50B in which a return spring 49B is accommodated is defined in front of the second piston 48B. When the first and second pistons 48A and 48B are driven in the forward direction by the ball screw mechanism 46 of the actuator 43, the brake hydraulic pressure generated in the first and second hydraulic pressure chambers 50A and 50B is changed to the first and second output ports 51A. , 51B to the liquid paths Pb, Qb.

  The reservoir 69 of the slave cylinder 42 and the reservoir 20 of the master cylinder 11 are connected by a discharge side liquid passage Rc, and the back chamber 70 of the piston 38 of the stroke simulator 35 is connected to the discharge side liquid passage Rc via the discharge side liquid passage Rd. It is connected to the middle part. An on-off valve 71 that is manually opened and closed is provided between the bypass liquid paths Re and Rf that connect the supply side liquid path Rb and the discharge side liquid path Rd so as to bypass the stroke simulator 35.

  As shown in FIG. 3, the bypass liquid paths Re and Rf that bypass the stroke simulator 35 are formed, for example, so as to be orthogonal to each other inside a housing 72 in which the cylinder 36 of the stroke simulator 35 is integrally formed. The on-off valve 71 includes a bolt hole 72a formed in the housing 72 and a bolt 73 that is screwed into the bolt hole 72a.

  That is, the bolt hole 72a has a small-diameter hole 72b and a large-diameter hole 72c formed coaxially. The small-diameter hole 72b communicates with the bypass liquid path Re at the center of the bottom, and the bypass liquid path Rf communicates with the side wall of the small-diameter hole 72b. To do. The bolt 73 includes a small-diameter portion 73a, a large-diameter portion 73b, and a head portion 73c. An O-ring 74 attached to the outer periphery of the small-diameter portion 73a abuts on the small-diameter hole 72b of the bolt hole 72a and has a large diameter having a male screw. The portion 73 b is screwed into a large diameter hole 72 c having a female screw, and the head portion 73 c is exposed to the outside of the housing 72. The annular seal portion b formed in the small diameter portion 73a of the bolt 73 abuts on the conical seat portion a formed in the small diameter hole 72b of the bolt hole 72a.

  Accordingly, when the head 73c is operated and the bolt 73 is screwed into the bolt hole 72a, the seal part b of the bolt is seated on the seat part a of the bolt hole 72a, the on-off valve 71 is closed, and the bypass liquid path Re and bypass The communication of the liquid path Rf is blocked. Conversely, when the head 73c is operated to loosen the bolt 73, the bolt seal portion b is separated from the seat portion a of the bolt hole 72a, the on-off valve 71 is opened, and the bypass liquid path Re and the bypass liquid path Rf are opened. Communicate.

  Returning to FIG. 1, the structure of the VSA device 23 is well known, and includes a first brake actuator 23 </ b> A that controls the first system of the left and right rear wheel disc brake devices 24, 25, and the left and right front wheel disc brake devices 28, The second brake actuator 23B that controls the second system 29 is provided with the same structure.

  As a representative example, the first brake actuator 23A of the first system of the left and right rear wheel disc brake devices 24, 25 will be described below.

  The first brake actuator 23A includes a fluid path Pb that communicates with the first master cut valve 32 located on the upstream side, and fluid paths Pc and Pd that communicate with the left and right rear wheel wheel cylinders 26 and 27 located on the downstream side, respectively. Arranged between.

  The first brake actuator 23A is provided with a common fluid path 52 and a fluid path 53 for the left and right rear wheel cylinders 26, 27, and is always of variable opening disposed between the fluid path Pb and the fluid path 52. A regulator valve 54 composed of an open solenoid valve, a check valve 55 arranged in parallel to the regulator valve 54 to allow the brake fluid to flow from the liquid path Pb side to the liquid path 52 side, the liquid path 52 and An in-valve 56 composed of a normally-open electromagnetic valve disposed between the fluid paths Pd and a check valve that is disposed in parallel to the in-valve 56 and allows the brake fluid to flow from the fluid path Pd side to the fluid path 52 side. 57, an in-valve 58 formed of a normally-open electromagnetic valve disposed between the liquid path 52 and the liquid path Pc, and a liquid path from the liquid path Pc side disposed in parallel to the in-valve 58. A check valve 59 that allows the brake fluid to flow to the second side, an out valve 60 that is a normally closed electromagnetic valve disposed between the fluid path Pd and the fluid path 53, and is disposed between the fluid path Pc and the fluid path 53. Brake fluid from the liquid path 53 side to the liquid path Pb side disposed between the liquid path 53 and the liquid path Pb, and the out valve 61 composed of the normally closed solenoid valve, the reservoir 62 connected to the liquid path 53, and the liquid path Pb. A check valve 63 that permits the flow of oil, a pump 64 that is disposed between the liquid passage 52 and the liquid passage 53 and supplies brake fluid from the liquid passage 53 side to the liquid passage 52 side, and an electric motor 65 that drives the pump 64. And a pair of check valves 66 and 67 provided on the suction side and the discharge side of the pump 64 to prevent the backflow of the brake fluid, and between the check valve 63 and the intermediate position of the pump 64 and the liquid passage Pb. And and a suction valve 68 of the normally closed solenoid valve.

  The electric motor 65 is shared with the pumps 64 and 64 of the first and second brake actuators 23A and 23B. However, dedicated electric motors 65 and 65 are provided for the pumps 64 and 64, respectively. It is also possible to provide it.

  As shown in FIGS. 1 and 2, a first hydraulic pressure sensor Sa that detects the hydraulic pressure is connected to the hydraulic path Pa, and a second hydraulic pressure sensor Sb that detects the hydraulic pressure is connected to the hydraulic path Qb. Is connected. The electronic control unit U connected to the first and second master cut valves 32 and 33, the simulator valve 34, the slave cylinder 42 and the VSA device 23 includes the first hydraulic pressure sensor Sa and the second hydraulic pressure sensor Sb. Are connected to wheel speed sensors Sc for detecting the wheel speed of each wheel.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  First, a normal braking action at normal time will be described with reference to FIG.

  When the system normally functions, when the first hydraulic pressure sensor Sa provided in the fluid path Pa detects that the driver depresses the brake pedal 12, the first and second master cut valves 32 made up of normally open solenoid valves. 33 are excited to close, and the simulator valve 34 formed of a normally closed electromagnetic valve is excited to open. At the same time, the actuator 43 of the slave cylinder 42 is actuated to advance the first and second pistons 48A and 48B, whereby brake fluid pressure is generated in the first and second fluid pressure chambers 50A and 50B. Is transmitted from the first and second output ports 51A, 51B to the liquid passage Pb and the liquid passage Qb, and the disc brake is opened from both the liquid passages Pb, Qb via the in-valves 56, 56; It is transmitted to the wheel cylinders 26, 27; 30, 31 of the devices 24, 25; 28, 29 to brake each wheel.

  Further, the simulator valve 34, which is a normally closed solenoid valve, is excited and opened, and the on-off valve 71 is closed, so that the brake hydraulic pressure generated in the second hydraulic chamber 19 of the master cylinder 11 is opened. Is transmitted to the hydraulic pressure chamber 39 of the stroke simulator 35 through the simulator valve 34, and the piston 38 is moved against the spring 37 to allow the stroke of the brake pedal 12 and generate a pseudo pedal reaction force. This can eliminate the driver's uncomfortable feeling.

  And the brake hydraulic pressure by the slave cylinder 42 detected by the second hydraulic pressure sensor Sb provided in the fluid path Qb corresponds to the brake hydraulic pressure by the master cylinder 11 detected by the first hydraulic pressure sensor Sa provided in the fluid path Pa. By controlling the operation of the actuator 43 of the slave cylinder 42 so as to be large, the braking force corresponding to the operation amount input to the brake pedal 12 by the driver is generated in the disc brake devices 24, 25; Can be made.

  Next, the operation of the VSA device 23 will be described.

  When the VSA device 23 is not operating, the regulator valves 54 and 54 are demagnetized and opened, the suction valves 68 and 68 are demagnetized and closed, and the in-valves 56 and 56; 58 and 58 are demagnetized and opened. The out valves 60, 60; 61, 61 are demagnetized and closed. Therefore, when the driver depresses the brake pedal 12 to perform braking and the slave cylinder 42 operates, the brake hydraulic pressure output from the first and second output ports 51A and 51B of the slave cylinder 42 is regulated by the regulator valves 54 and 54. Is supplied to the wheel cylinders 26, 27; 30, 31 through the in valves 56, 56; 58, 58 in the open state, and the four wheels can be braked.

  When the VSA device 23 is operated, the pumps 64 and 64 are driven by the electric motor 65 with the suction valves 68 and 68 being excited and opened, and are sucked from the slave cylinder 42 through the suction valves 68 and 68 and pump 64 , 64 is supplied to the regulator valves 54, 54 and the in valves 56, 56; 58, 58. Accordingly, the brake fluid pressure in the fluid passages 52, 52 is adjusted by exciting the regulator valves 54, 54 and adjusting the opening, and the in-valves 56, 56; 58, 58 that open the brake fluid pressure are used. By selectively supplying to the wheel cylinders 26, 27; 30, 31, the braking force of the four wheels can be individually controlled even when the driver does not step on the brake pedal 12.

  Therefore, the braking force of the four wheels is individually controlled by the first and second brake actuators 23A and 23B, and the braking force of the inner turning wheel is increased to improve the turning performance, or the braking force of the outer turning wheel is increased to stabilize straight running. Performance can be improved.

  When the driver depresses the brake pedal 12 and detects, for example, that the left rear wheel has a tendency to lock on the low friction coefficient road based on the output of the wheel speed sensor Sc. Exciting one in-valve 58 of the first brake actuator 23A and closing it, and exciting and opening one out-valve 61 allow the brake fluid pressure of the wheel cylinder 26 of the left rear wheel to escape to the reservoir 62. After the pressure is reduced to a predetermined pressure, the out valve 61 is demagnetized and closed to maintain the brake fluid pressure of the wheel cylinder 26 of the left rear wheel. As a result, when the locking tendency of the wheel cylinder 26 of the left rear wheel is resolved, the brake fluid pressure from the first output port 51A of the slave cylinder 42 is opened by demagnetizing the in-valve 58 to open the left rear wheel. The braking force is increased by supplying the wheel cylinder 26 and increasing the pressure to a predetermined pressure.

  When the left rear wheel becomes locked again due to this pressure increase, by repeating the pressure reduction → hold → pressure increase, the ABS (anti-lock) that minimizes the braking distance while suppressing the lock on the left rear wheel is repeated.・ Brake system) can be controlled.

  The ABS control when the left rear wheel wheel cylinder 26 tends to lock has been described above. However, the right rear wheel wheel cylinder 27, the left front wheel wheel cylinder 30, and the right front wheel wheel cylinder 31 tend to lock. The ABS control can be performed in the same manner.

  Next, the operation when the slave cylinder 42 becomes inoperable due to a power failure or the like will be described with reference to FIG.

  When the power supply fails, the first and second master cut valves 32 and 33 made of normally open solenoid valves are automatically opened, and the simulator valve 34 made of normally closed solenoid valves is automatically closed. The in valves 56, 56; 58, 58 and the regulator valves 54, 54 made up of normally-open solenoid valves are automatically opened, and the out valves 60, 60; 61, 61 and the suction valves 68, made up of normally-closed solenoid valves. 68 automatically closes. In this state, the brake fluid pressure generated in the first and second fluid pressure chambers 17 and 19 of the master cylinder 11 is not absorbed by the stroke simulator 35, and the first and second master cut valves 32 and 33, the regulator valve. 54, 54 and the in-valves 56, 56; 58, 58, the wheel cylinders 26, 27; 30, 31 of the disc brake devices 24, 25; 30, 31 of each wheel are actuated to generate a braking force without any trouble. be able to.

  At this time, if the brake fluid pressure generated by the master cylinder 11 acts on the first and second fluid pressure chambers 50A and 50B of the slave cylinder 42 to retract the first and second pistons 48A and 48B, the first Further, the volume of the second hydraulic pressure chambers 50A and 50B is increased, the brake hydraulic pressure is reduced, and if the brake hydraulic pressure is maintained, the stroke of the brake pedal 12 may increase. However, since the ball screw mechanism 46 of the slave cylinder 42 is prevented from retreating when a load is input from the first piston 48A side, an increase in the volume of the first and second hydraulic chambers 50A and 50B is reduced. . In addition, you may provide separately the member which controls the reverse of 1st, 2nd piston 48A, 48B at the time of failure of the slave cylinder 42. FIG. In this case, it is desirable that the drive resistance is not increased during normal operation.

  Next, the action when the brake fluid is vented will be described with reference to FIG.

  In order to fill the assembled brake device with brake fluid, first, all the electromagnetic valves, that is, the first master cut valve 32, the second master cut valve 33, the simulator valve 34, the regulator valves 54 and 54, and the in valves 56 and 56 are used. 58, 58, out valves 60, 60; 61, 61 and suction valves 68, 68 are opened, for example, a vacuum pump is connected to the reservoir 20 of the master cylinder 11 to evacuate the interior of the brake device. After that, the brake fluid is filled from the reservoir 20 into the inside of the brake device that has become a vacuum. Thus, even if the brake device is filled with the brake fluid by using the vacuum, air may remain in the stroke simulator 35 and the surrounding fluid paths Ra to Rf.

  In order to discharge this air, first, the first master cut valve 32 and the second master cut valve 33 are excited and closed, and the simulator valve 34 is excited and opened, and the on-off valve 71 shown in FIG. The head 73c of the bolt 73 is rotated with a tool. As a result, the large-diameter portion 73b made of the male screw of the bolt 73 is loosened with respect to the large-diameter hole 72c made of the female screw of the bolt hole 72a, and the bolt 73 from the seat portion a of the small-diameter hole 72b of the bolt hole 72a as shown by the chain line. By separating the seal portion b of the small diameter portion 73a, the supply side fluid passages Ra, Rb and the discharge side fluid passages Rc, Rd of the stroke simulator 35 are connected by the bypass fluid passages Re, Rf, and the master cylinder 11 is stored in the reservoir. 20 communicates.

  Subsequently, by repeatedly depressing the brake pedal 12, the brake fluid sent from the first and second hydraulic chambers 17 and 19 of the master cylinder 11 is supplied to the supply side fluid paths Ra and Rb, the bypass fluid paths Re and Rf, and Air is discharged by flowing into the reservoir 20 through the paths of the discharge side liquid paths Rc and Rd and discharging the air accumulated in the path to the reservoir 20.

  As described above, according to the present embodiment, the simple structure in which the on-off valve 71 is provided in the bypass liquid passages Re and Rf that bypass the front and rear of the stroke simulator 35, and the stroke without using the brake fluid pumping device. Air remaining in the vicinity of the simulator 35 can be discharged.

  Further, since the on-off valve 71 is manually opened / closed, it can be opened / closed without being influenced by the state of the power source. Moreover, since the bolt 73 of the on-off valve 71 includes the O-ring 74, it is possible to prevent the bypass liquid passages Re and Rf from being released to the atmosphere via the bolt holes 72a. In addition to preventing the brake fluid pressure from leaking from Rf and operating the stroke simulator 35 reliably, it is possible to prevent air from entering the stroke simulator 35 when the on-off valve 71 is opened and closed. it can.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the structure of the on-off valve 71 is not limited to the embodiment, and any structure including an electromagnetic valve can be adopted as long as the bypass paths Re and Rf can be opened and shut off.

11 Master cylinder (hydraulic pressure source for backup)
12 Brake Pedal 20 Reservoir 26 Wheel Cylinder 27 Wheel Cylinder 30 Wheel Cylinder 31 Wheel Cylinder 35 Stroke Simulator 38 Piston 42 Slave Cylinder (Electric Fluid Generation Source)
70 Back chamber 71 On-off valve (blocking means)
74 O-ring (sealing means)
Ra, Rb Supply side liquid path Rc, Rd Discharge side liquid path Re, Rf Bypass liquid path

Claims (5)

A backup hydraulic pressure generation source (11) that generates brake hydraulic pressure by operating the brake pedal (12), and communication between the backup hydraulic pressure generation source (11) and the wheel cylinders (26, 27; 30, 31) In a state in which the electric pressure is cut off, an electric hydraulic pressure generation source (42) that electrically generates a brake hydraulic pressure corresponding to an operation amount of the brake pedal (12), and an operation of the electric hydraulic pressure generation source (42) Sometimes, a stroke simulator that absorbs brake fluid supplied from the backup hydraulic pressure generation source (11) via the supply side fluid passages (Ra, Rb) and applies an operation reaction force to the brake pedal (12). (35) A vehicle brake device comprising:
The stroke simulator (35) includes a piston (38) driven by the brake hydraulic pressure from the backup hydraulic pressure generation source (11), and a back chamber (70) formed at the back of the piston (38). The discharge side liquid passages (Rc, Rd) connecting the back chamber (70) to the reservoir (20), and the supply side liquid passages (Ra, R, R) bypassing the piston (38) and the back chamber (70). Rb) and a bypass liquid path (Re, Rf) for connecting the discharge side liquid paths (Rc, Rd) and a blocking means (71) for blocking the bypass liquid paths (Re, Rf). Brake device for vehicles.   The vehicular brake device according to claim 1, wherein the shut-off means (71) comprises an on-off valve that can be manually opened and closed.   The vehicle brake device according to claim 1 or 2, wherein the blocking means (71) includes a sealing means (74) for preventing the bypass liquid passages (Re, Rf) from being released into the atmosphere. .   The said sealing means (74) is comprised so that the atmospheric | air release of the said bypass liquid path (Re, Rf) may be prevented irrespective of the open / close state of the said interruption | blocking means (71). The brake device for vehicles as described in. A backup hydraulic pressure generation source (11) that generates brake hydraulic pressure by operating the brake pedal (12), and communication between the backup hydraulic pressure generation source (11) and the wheel cylinders (26, 27; 30, 31) In a state in which the electric pressure is cut off, an electric hydraulic pressure generation source (42) that electrically generates a brake hydraulic pressure corresponding to an operation amount of the brake pedal (12), and an operation of the electric hydraulic pressure generation source (42) Sometimes, a stroke simulator that absorbs brake fluid supplied from the backup hydraulic pressure generation source (11) via the supply side fluid passages (Ra, Rb) and applies an operation reaction force to the brake pedal (12). (35), a method for bleeding air from a vehicle brake device,
The discharge side liquid passages (Rc, Rd) and the supply side liquid passages (Ra, Rb) connecting the back chamber (70) formed in the back portion of the piston (38) to the reservoir (20) are connected to the bypass liquid passage ( Connecting via Re, Rf);
Operating the brake pedal (12) in a state where the backup hydraulic pressure source (11) is connected to the stroke simulator (35);
And a step of blocking the bypass liquid passages (Re, Rf).

Images