JP6514020B2 - Vehicle hydraulic pressure master cylinder - Google Patents

Description

  The present invention relates to a fluid pressure master cylinder for a vehicle, and more specifically, a relief port and a supply port are opened in a cylinder hole of the fluid pressure master cylinder, and a cup seal fitted to the piston along with the movement of the piston The present invention relates to a side port type vehicle hydraulic pressure master cylinder that is closed to increase the pressure in a hydraulic pressure chamber.

  In vehicles equipped with a fluid pressure control device having a self-boosting function, there is one that supplies hydraulic fluid from a reservoir via a fluid pressure chamber of a fluid pressure master cylinder when the fluid pressure control device is operated. In the master cylinder, the hydraulic fluid was introduced into the fluid pressure control device, and when the fluid pressure chamber had a negative pressure, the cup seal was bent so as to face the bottom of the cylinder hole, and the hydraulic fluid was replenished from the relief port and the supply port See, for example, Patent Document 1). In addition, a center valve was provided at the end of the piston, and the center valve performed the flow and blocking of the working fluid between the fluid pressure chamber and the reservoir to improve the replenishment of the working fluid when the fluid pressure control device was operated. There has been one (see, for example, Patent Document 2).

Patent No. 4681577 Patent No. 4690359

  However, in the case of the above-mentioned Patent Document 1, since the cup seal must have sufficient rigidity to define the fluid pressure chamber, the fluid pressure chamber becomes negative by the operation of the fluid pressure control device. When pressure was applied, the cup seal bent and it took time to replenish the hydraulic pressure chamber with the hydraulic fluid. Further, in the case of Patent Document 2, the cost is increased because the number of parts is increased.

  Therefore, an object of the present invention is to provide a vehicle hydraulic pressure master cylinder capable of quickly replenishing the hydraulic pressure chamber with sufficient hydraulic fluid at the time of operation of the hydraulic pressure control device while suppressing the cost.

In order to achieve the above object, the vehicle hydraulic pressure master cylinder of the present invention has a cylinder body with a bottomed cylinder hole for movably receiving a piston, and opens a relief port and a supply port in the cylinder hole. The piston seals a cup seal on an outer peripheral portion disposed between the relief port and the supply port in a non-operating state, and the cup seal closes the relief port as the piston moves. A pressure increase in the hydraulic pressure chamber defined between the cup seal and the cylinder hole, and urging the piston to the cylinder hole opening side between the piston and the cylinder hole bottom portion In the fluid pressure master cylinder for a vehicle in which a spring is disposed, the piston is formed with a bottomed cylindrical portion opened to the cylinder hole bottom side. A liquid through hole communicating the cylinder hole with the bottomed cylindrical portion is formed closer to the cylinder hole opening side than the bottomed cylindrical portion, and the liquid pressure chamber has the positive pressure when the fluid pressure chamber has a positive pressure. There is provided a closing member for closing the opening of the through hole and opening the opening of the fluid passage when the fluid pressure chamber has a negative pressure, and when the negative pressure of the fluid pressure chamber, the blocking member is the cup seal The opening of the fluid passage hole is opened prior to the bending and the supply of the hydraulic fluid to the fluid pressure chamber .

Further , the closing member may be formed of a plate-like sealing member having an outer peripheral lip on the outer periphery of the disk-like main body, and may be disposed at the bottom of the bottomed cylindrical portion. Furthermore, the vehicle hydraulic master cylinder of the present invention forms a bottomed cylinder hole in the cylinder body for movably accommodating the piston, opens the relief port and the supply port in the cylinder hole, and the piston In the inoperative state, a cup seal is fitted on the outer peripheral portion disposed between the relief port and the supply port, and the cup seal closes the relief port as the piston moves, and the cup seal The pressure in the fluid pressure chamber defined between the cylinder and the cylinder bore is increased, and a return spring is disposed between the piston and the bottom of the cylinder bore for biasing the piston toward the cylinder bore opening side. In the fluid pressure master cylinder for a vehicle, the piston is formed with a bottomed cylindrical portion that opens to the cylinder hole bottom side, and the piston is more than the bottomed cylindrical portion. A liquid passage hole communicating the cylinder hole and the bottomed cylinder portion is formed on the side of the cylinder hole opening, and when the fluid pressure chamber has a positive pressure, the opening portion of the liquid passage hole is formed in the bottomed cylinder portion. A closing member is provided for closing the opening and opening the opening of the fluid passage when the fluid pressure chamber has a negative pressure, and the closing member includes a valve body disposed at the opening of the fluid passage and an end It is a check valve constituted by a spring which contacts the valve body and biases the valve body to the opening, and a retainer with which the other end of the spring abuts, and the retainer is the bottomed cylindrical portion. While being caulked and fixed to the bottom side, it is characterized in that a plurality of through holes are formed. Further, it is preferable that the return spring be attached with one end portion being in contact with the bottom of the cylinder hole and the other end portion being in contact with the closing member. Further, the liquid passage hole is formed by a first liquid passage hole penetrating in a radial direction of the piston, and a second liquid passage hole opened to the first liquid passage hole and the bottomed cylindrical portion, Preferably, in the non-operating state of the piston, the first fluid passage is disposed at a position corresponding to the supply port .

  According to the fluid pressure master cylinder for a vehicle of the present invention, when the fluid pressure control chamber is turned to a negative pressure by the actuation of the fluid pressure control device, the closing member disposed in the bottomed cylindrical portion provided in the piston is opened. The hydraulic fluid is supplied to the fluid pressure chamber through the fluid and fluid passage holes, and the cup seal is flexed to supply the hydraulic fluid to the fluid pressure chamber through the relief port and the supply port. The fluid can be quickly replenished to the fluid pressure chamber.

  Furthermore, during negative pressure in the fluid pressure chamber, the closing member opens the opening of the fluid passage hole before the cup seal bends and the supply port begins to supply the hydraulic fluid to the fluid pressure chamber. The hydraulic fluid can be quickly supplied to the fluid pressure chamber while maintaining the rigidity of the fluid pressure chamber. Further, since the return spring is attached with one end contacting the bottom of the cylinder hole and the other end contacting the closing member, the closing member can be fixed by the return spring. Further, the liquid passage hole is formed by a first liquid passage hole penetrating in a radial direction of the piston and a second liquid passage hole opened in the first liquid passage hole and the bottomed cylindrical portion, and the piston does not operate In the state, the first fluid passage hole is disposed at the position corresponding to the supply port, so that the hydraulic fluid chamber can be more rapidly supplied with the hydraulic fluid when the fluid pressure chamber becomes negative pressure. .

  Further, the closing member includes a valve body disposed at the opening of the fluid passage hole, a spring whose one end abuts against the valve body to bias the valve body toward the opening, and a retainer whose other end contacts the spring. The retainer is crimped and fixed to the bottom side of the bottomed cylindrical portion and has a plurality of through holes, so that the hydraulic pressure chamber has a negative pressure and an inexpensive structure. The hydraulic fluid can be satisfactorily replenished to the fluid pressure chamber when it has become Further, the closing member is formed of a plate-like sealing member having an outer peripheral lip on the outer periphery of the disk-like main body, and is disposed at the bottom of the bottomed cylindrical portion, thereby providing a more inexpensive structure. When the pressure becomes negative, the hydraulic fluid can be satisfactorily replenished to the fluid pressure chamber.

FIG. 1 is a cross-sectional view of a vehicle hydraulic pressure master cylinder showing a first embodiment of the present invention. FIG. 6 is a cross-sectional view of the vehicle hydraulic master cylinder in a state where the hydraulic pressure chamber is at negative pressure as well. FIG. 6 is a cross-sectional view of a vehicle hydraulic master cylinder in a state where a piston is similarly operated. It is a sectional view of a fluid pressure master cylinder for vehicles in the state where a fluid pressure room showing a 2nd example of the present invention became negative pressure. FIG. 6 is a cross-sectional view of a vehicle hydraulic master cylinder in a state where a piston is similarly operated.

  1 to 3 are views showing a first embodiment of a vehicle hydraulic pressure master cylinder of the present invention. In the hydraulic master cylinder 1 of the present embodiment, a reservoir mounting boss portion 2 a connected to a reservoir (not shown) is formed on a peripheral wall of the cylinder body 2, and a cylinder hole 2 b having a bottom is formed in the cylinder body 2. Is provided by opening one side. The piston 3 is inserted into the cylinder hole 2b, and the cylinder hole 2b and the reservoir communicate with each other through the relief port 4 and the supply port 5 formed on the peripheral wall of the cylinder body 2 which is the bottom of the reservoir mounting boss 2a. ing.

  In the piston 3, cup seals 6 and 7 are fitted on the cylinder hole bottom side and the cylinder hole opening side. A hydraulic pressure chamber 8 is defined between the cup seal 6 on the cylinder hole bottom side and the bottom wall 2c of the cylinder hole 2b, and a union hole (see FIG. Not shown). Further, in the piston 3, a bottomed cylindrical portion 3a opened to the cylinder hole bottom side is formed in the axial direction of the piston 3, and on the cylinder hole opening side with respect to the bottomed cylindrical portion 3a, the cylinder hole 2b and A liquid passage hole 9 communicating with the bottomed cylindrical portion 3a is formed.

  In the bottomed cylindrical portion 3a, the large diameter portion 3b is continuously formed on the cylinder hole bottom portion side, and the small diameter portion 3c is continuously formed on the cylinder hole opening side, and the liquid passage hole 9 is opened in the bottom portion of the small diameter portion 3c. A closing member 10 is disposed across the portion 3c and the large diameter portion 3b. The closing member 10 includes a spherical valve body 11 (a valve body of the present invention) accommodated in the small diameter portion 3c, a retainer 12 crimped and fixed to the cylinder hole opening side of the large diameter portion 3b, the spherical valve body 11 and A check valve comprising a spring 13 compressed between the retainer 12 and urging the spherical valve body 11 toward the opening of the fluid passage hole 9. A plurality of through holes 12a are formed in the retainer 12 . A return spring 14 is compressed between the retainer 12 and the bottom wall 2 c of the cylinder hole 2 b, and the piston 3 is biased toward the cylinder hole by the return spring 14. The fluid passage hole 9 formed in the piston 3 is opened to a first fluid passage hole 9a penetrating in the radial direction of the piston 3 and the first fluid passage hole 9a and the small diameter portion 3c of the bottomed cylindrical portion 3a. It is formed by the second liquid passage hole 9b.

  A large diameter hole 3d having a diameter larger than that of the cylinder hole 2b is continuously provided in the cylinder body 2 so as to be continuous with the opening of the cylinder hole 2b. A clip for preventing the piston 3 from coming off in the large diameter hole 3d. 15 are provided. A piston actuator 16 is in contact with the end of the piston 3 on the cylinder hole opening side, and a boot 17 is disposed between the piston actuator 16 and the clip 15.

  When the hydraulic master cylinder 1 formed as described above is not operated, as shown in FIG. 1, the first fluid passage hole 9a is disposed at a position corresponding to the supply port 5, and the cup seal 6 is a relief. It is disposed slightly closer to the cylinder hole opening side than the port 4. Further, the retainer 12 is in a state of being securely fixed by the resilient force of the return spring 14, and the spherical valve body 11 is seated on the bottom of the small diameter portion 3c by the resilient force of the spring 13, The second fluid passage hole 9b is closed.

  Further, when the fluid pressure control device such as the ABS control device operates and the working fluid is supplied from the reservoir to the fluid pressure control device via the fluid pressure chamber 8 and the fluid pressure chamber 8 becomes negative pressure, As shown in FIG. 2, the hydraulic fluid is replenished from the relief port 4 to the fluid pressure chamber 8, and the spherical valve body 11 is separated from the bottom of the small diameter portion 3c against the elastic force of the spring 13, By opening the fluid passage hole 9b, the hydraulic fluid is replenished to the fluid pressure chamber 8 through the supply port 5, the first fluid passage hole 9a, the second fluid passage hole 9b, and the passage hole 12a. Then, the cup seal 6 is bent so as to extend to the bottom of the cylinder hole, whereby the hydraulic fluid chamber 8 is replenished with the hydraulic fluid from the supply port 5.

  Furthermore, when the piston actuator 16 is actuated, as shown in FIG. 3, the spherical valve body 11 is seated on the bottom of the small diameter portion 3c to close the second fluid passage hole 9b. When 3 moves toward the bottom of the cylinder hole, the first fluid passage 9a passes through the supply port 5, and the cup seal 6 passes through the relief port 4, fluid pressure is generated in the fluid pressure chamber 8, and the boosted hydraulic fluid It is supplied to hydraulic equipment such as a brake from the union hole.

  Since the hydraulic pressure master cylinder 1 of the present embodiment is formed as described above, when the hydraulic pressure control device operates and the hydraulic pressure chamber 8 becomes negative pressure, sufficient hydraulic fluid is supplied from the reservoir. The fluid pressure chamber 8 can be quickly replenished. Furthermore, before the cup seal 6 bends and the supply of hydraulic fluid from the supply port 5 to the hydraulic pressure chamber 8, the spherical valve body 11 opens the second liquid passage hole 9b, thereby maintaining the rigidity of the cup seal. However, the hydraulic fluid can be quickly supplied to the fluid pressure chamber 8. The return spring 14 is attached with its one end abutting on the bottom of the cylinder hole and the other end abutting on the retainer 12, so that the retainer 12 can be reliably fixed by the return spring 14. Furthermore, the liquid passage hole 9 is formed by the first liquid passage hole 9 a and the second liquid passage hole 9 b, and in the position where the first liquid passage hole 9 a corresponds to the supply port 5 when the piston 3 is inoperative. Since it is arrange | positioned, when the hydraulic pressure chamber 8 becomes negative pressure, hydraulic fluid can be supplied to the hydraulic pressure chamber 8 more rapidly. Further, by forming the closing member 10 with a check valve provided with the spherical valve body 11, the retainer 12 and the spring 13, the number of parts can be reduced less than that of a hydraulic master cylinder provided with a conventional center valve. Cost reduction can be achieved.

  FIGS. 4 and 5 show a second embodiment of the present invention, in which the same components as those in the first embodiment are designated by the same reference numerals and their detailed description will be omitted. . The closing member 18 according to this embodiment is formed of a disc-like sealing member including a disc-shaped main body 18a and an outer peripheral lip 18b projecting from the outer periphery of the main body 18a toward the bottom of the cylinder hole. The second fluid passage hole 9b is opened at the bottom of the bottomed cylindrical portion 3e formed in the piston 3, and the main body 18a of the closing member 18 is disposed so as to cover the second fluid passage hole 9b. It is fixed.

  The hydraulic pressure master cylinder 1 of this embodiment is shown in FIG. 4 when the hydraulic pressure control device operates and hydraulic fluid is supplied from the reservoir to the hydraulic pressure control device via the hydraulic pressure chamber 8 as shown in FIG. In addition, when the hydraulic pressure chamber 8 becomes negative pressure, the hydraulic fluid is replenished from the relief port 4 to the hydraulic pressure chamber 8, and the closing member 18 is bent to open the second fluid passage hole 9b. 5, hydraulic fluid is replenished to the fluid pressure chamber 8 through the first fluid passage hole 9a and the second fluid passage hole 9b. Then, the cup seal 6 is bent so as to extend to the bottom of the cylinder hole, whereby the hydraulic fluid chamber 8 is replenished with the hydraulic fluid from the supply port 5.

  When the piston actuator 16 is actuated, as shown in FIG. 5, the piston 3 is moved to the bottom of the cylinder hole with the closing member 18 closing the second liquid passage hole 9b, When the first fluid passage hole 9a passes through the supply port 5 and the cup seal 6 passes through the relief port 4, a fluid pressure is generated in the fluid pressure chamber 8, and the pressurized hydraulic fluid is transferred from the union hole to the hydraulic device such as a brake. Supplied.

  In this embodiment, since the closing member 18 is formed only by the plate-like sealing member, the number of parts can be reduced, the cost can be reduced, and the closing member 18 can be easily assembled. be able to.

  The present invention is not limited to the embodiments described above, and the closing member opens the opening of the fluid passage hole when the fluid pressure control device is operated and the fluid pressure chamber becomes negative pressure. At the same time, the cup seal may be bent to start supplying hydraulic fluid to the fluid pressure chamber. Further, the liquid passage hole may be any as long as the cylinder hole and the bottomed cylindrical portion communicate with each other, and is not limited to the one including the first liquid passage hole and the second liquid passage hole.

DESCRIPTION OF SYMBOLS 1 ... hydraulic master cylinder, 2 ... cylinder body, 2a ... reservoir mounting boss part, 2b ... cylinder hole, 2c ... bottom wall, 3 ... piston, 3a ... bottomed cylinder part, 3b ... large diameter part, 3c ... small diameter part , 3d: large diameter hole, 3e: bottomed cylindrical portion, 4: relief port, 5: supply port, 6, 7: cup seal, 8: hydraulic pressure chamber, 9: fluid passage hole, 9a: first fluid passage hole , 9b: second fluid passage hole, 10: closing member, 11: spherical valve body, 12: retainer, 12a: passage hole, 13: spring, 14: return spring, 15: clip, 16: piston actuator, 17: 17 Boots, 18: closing member, 18a: main body, 18b: outer peripheral lip

Claims (5)

A cylinder body is provided with a bottomed cylinder hole for movably receiving a piston, a relief port and a supply port are opened in the cylinder hole, and the piston is in a non-operating state, the relief port and the supply port A cup seal is fitted on the outer peripheral portion disposed between the two, and the cup seal closes the relief port with the movement of the piston, and the hydraulic pressure defined between the cup seal and the cylinder hole A hydraulic pressure master cylinder for a vehicle, in which a return spring is disposed between the piston and the bottom of the cylinder hole to pressurize the piston toward the opening of the cylinder hole while pressurizing the liquid pressure in the chamber.
The piston is formed with a bottomed cylindrical portion opened to the cylinder hole bottom side, and a liquid through hole communicating the cylinder hole and the bottomed cylindrical portion closer to the cylinder hole opening than the bottomed cylindrical portion When the fluid pressure chamber has a positive pressure, the open end of the fluid passage hole is closed, and when the fluid pressure chamber has a negative pressure, the fluid passage hole is opened. Provide a closure member ,
At the time of negative pressure of the fluid pressure chamber, the closing member is characterized in that the opening of the fluid passage hole is opened before the cup seal is bent to start supplying the working fluid to the fluid pressure chamber. Hydraulic pressure master cylinder for vehicles. 2. The vehicle according to claim 1 , wherein the closing member is formed of a plate-like sealing member having an outer peripheral lip on an outer periphery of the disk-like main body, and is disposed at the bottom of the bottomed cylindrical portion . Hydraulic master cylinder. A cylinder body is provided with a bottomed cylinder hole for movably receiving a piston, a relief port and a supply port are opened in the cylinder hole, and the piston is in a non-operating state, the relief port and the supply port A cup seal is fitted on the outer peripheral portion disposed between the two, and the cup seal closes the relief port with the movement of the piston, and the hydraulic pressure defined between the cup seal and the cylinder hole A hydraulic pressure master cylinder for a vehicle, in which a return spring is disposed between the piston and the bottom of the cylinder hole to pressurize the piston toward the opening of the cylinder hole while pressurizing the liquid pressure in the chamber.
  The piston is formed with a bottomed cylindrical portion opened to the cylinder hole bottom side, and a liquid through hole communicating the cylinder hole and the bottomed cylindrical portion closer to the cylinder hole opening than the bottomed cylindrical portion When the fluid pressure chamber has a positive pressure, the open end of the fluid passage hole is closed, and when the fluid pressure chamber has a negative pressure, the fluid passage hole is opened. Provide a closure member,
  The closing member includes a valve body disposed at the opening of the liquid passage hole, a spring having one end abutting on the valve body to bias the valve body toward the opening, and the other end of the spring It is a check valve which comprises a retainer which contacts, and said retainer is crimped and fixed to the bottom side of said bottomed cylinder part, and a plurality of through holes are formed. Pressure master cylinder. The vehicle according to any one of claims 1 to 3, wherein the return spring is attached with one end portion being in contact with the bottom of the cylinder hole and the other end portion being in contact with the closing member. Hydraulic master cylinder. The liquid passage hole is formed by a first liquid passage hole penetrating in a radial direction of the piston, and a second liquid passage hole opened in the first liquid passage hole and the bottomed cylindrical portion, and The vehicle hydraulic pressure master cylinder according to any one of claims 1 to 4 , wherein the first fluid passage hole is disposed at a position corresponding to the supply port in an inoperative state.

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