JPH0573273U - Hydraulic pump device - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is a liquid that can reduce or prevent noise and vibration without tightening the dimensional tolerance of each component and without impairing the ease of mounting on a motor. It aims to provide a pressure pump. [Structure] A rotor 15 rotatably housed in the main body 2.
And a stator 25 provided eccentrically on the radially outer side of the rotor 15, the stator 25 and the rotor 15
A piston 20 which reciprocates so as to suck and pressurize hydraulic fluid by relative rotation with respect to the main body 2, a receiving portion 3a provided on the main body and engageable with one end of the rotor 15, And a motor 35 fitted to the other end of the rotor 15 to enable transmission of the rotational force of the output shaft 37. Between the other end of the motor and the output shaft 37 of the motor 35, an elastic member 30 for biasing the rotor 15 toward the receiving portion 3a is interposed. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is particularly suitable for a radial piston type hydraulic pump device, and relates to, for example, a hydraulic pump device used as a power pressure source of a vehicle brake system.

[0002]

[Prior Art]

 An example of this type of hydraulic pump device is shown in Japanese Patent Application Laid-Open No. 61-61985. This is because when the motor is attached to the main body, the output shaft of the motor can be easily coupled to the other end of the rotor so that the output shaft of the motor is rotated in the axial direction. After the motor is attached, the rotor is restricted from moving in the axial direction by the receiving part of the main body and the fitting part of the output shaft. ing.

[0003]

[Problems to be solved by the device]

 In this conventional hydraulic pump device, there is a dimensional error in manufacturing each component, and there is also a dimensional error in mounting the motor to the main body.Therefore, there is no choice between the fitting of the output shaft and the receiving part. In this case, there is a gap (rattle) in which the rotor can move in the axial direction.

For this reason, there is a problem that the rotor reciprocates in the axial direction when the pump is operated, and noise and vibration increase.

The present invention has been made in order to solve this problem, and does not violate the dimensional tolerances of the respective components and does not impair the ease of mounting the motor, thereby suppressing noise vibration. It is an object of the present invention to provide a hydraulic pump device that can be reduced or prevented.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a rotor rotatably accommodated in a main body, a stator eccentrically provided on a radially outer side of the rotor, and the stator. A piston that reciprocates so that hydraulic fluid can be sucked and pressurized by the relative rotation of the rotor and the rotor, and a receiving portion that is provided in the main body and that one end of the rotor can engage with. And a motor fitted to the main body and capable of transmitting the rotational force of the output shaft and fitted to the other end of the rotor. An elastic member capable of urging the rotor toward the receiving portion is interposed between the other end of the rotor and the output shaft of the motor. ..

[0007]

[Action]

 In the hydraulic pump device of the present invention described above, when the motor is fitted to the rotor, an elastic member is interposed between the end portion of the rotor and the output shaft of the motor. This elastic member provides elasticity to the rotor receiving member side so as to fill the gap between the receiving portion and the end of the rotor and between the output shaft and the other end of the rotor. Positioning prevents the rotor from moving in its axial direction.

[0008]

【Example】

 First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an enlarged longitudinal sectional view of a main part of a radial piston type hydraulic pump device, in which 1 is a hydraulic pump device and 2 is a pump main body of the hydraulic pump device 1, which is closed at an upper portion. The recess 3 has a mounting hole 3A, a large-diameter hole 3B, a medium-diameter hole 3C, and a small-diameter hole 3D that are gradually reduced in diameter from above. A shaft hole 4 extending downward in the axial direction is formed from a bottom 3a (hereinafter, simply referred to as a receiving portion 3a) of the recess 3 which serves as a receiving portion of the rotor 15.

Reference numeral 5 denotes a shaft-shaped pintle, which is erected non-rotatably in the shaft hole 4 of the pump main body 2 at one end thereof and is erected on the pump main body 2, and the other end is a recess. It protrudes into 3. Inside the pintle 5, an inflow path 6 and an outflow path 7 which are parallel to each other and extend in the axial direction are formed. The inflow passage 6 is opened in the recess 3, and is connected to the working fluid reservoir by a pipe from a suction port (not shown) that opens in the peripheral wall of the pump body 2 and communicates with the recess 3. The outflow passage 7 is connected to an inlet of a check valve 9 provided at a lower portion of the pump body 2 through a through hole 8. The outlet of the check valve 9 is connected to an accumulator through a pipe from a discharge port (not shown). Reference numeral 10 denotes a cup-shaped lid member which is fitted into a storage hole 11 that covers the check valve 9 and opens at the lower portion of the peripheral wall of the pump body 2, and seals the storage hole 11 from the outside.

Reference numeral 15 denotes a rotor, which has a central hole 16 penetrating in the axial direction thereof and a cylinder hole 17 intersecting the central hole 16 and penetrating in the radial direction. A cylindrical portion 18 provided concentrically with the rotor 15 projects upward from the axial line from one end of the rotor 15. The rotor 15 is fitted in the center hole 16 on the outer circumference of the pintle 5 and is rotatably supported by the pintle 5, and at the same time, the lower end 15a (on the opposite side where the tubular portion 18 is provided). The end portion) engages with the receiving portion 3 a of the recess 3. A groove 19 penetrating in the radial direction is provided in the tubular portion 18. A piston 20 is housed in each portion of the cylinder hole 17 that faces the radial direction. The piston 20 is composed of a shaft portion 21 and an arc-shaped head portion 22 which is integrally formed at the tip of the shaft portion 21, and slides on the shaft portion 21 side from the radially outer side of the rotor 15 into the cylinder hole 17. The cylinders 17 are freely fitted and define a pressure chamber B in the cylinder hole 17 between the piston 20 and the pintle 5. Each of the inflow path 6 and the outflow path 7 of the pintle 5 can communicate with the pressure chamber B in accordance with the rotation of the rotor 15 through a hole 6A or 7A that extends in a radially opposite direction.

A ball bearing 25 is composed of an inner race 26, a ball 27 and an outer race 28, and is fitted and mounted in the medium diameter hole 3 C of the recess 3 of the pump body 2. A ring fitted in the large-diameter hole portion 3B of the recess 3 from above the ball bearing 25 is used for retaining and fixing. At this time, the ball bearing 25 is eccentric in the radial direction by a predetermined amount with respect to the shaft center of the rotor 15, and the inner peripheral surface of the inner race 26 is of the rotor 15. It is arranged so as to face the head 22 of the piston 20 from the radial direction. The head 22 of the piston 20 is brought into sliding contact with the inner peripheral surface of the inner race 26 in accordance with the rotation of the rotor 15. Reference numeral 30 is an elastic member made of a rubber ring, and a circular filter sheet 30A is integrally stretched on the inner circumference, and also functions as a holding member for the filter sheet 30A. The elastic member 30 abuts on the inner peripheral surface of the cylindrical portion 18 of the rotor 15 and is mounted on the upper surface of the rotor 15.

Reference numeral 31 denotes a transmission member, which has a diameter slightly smaller than the inner diameter of the cylindrical portion 18 of the rotor 15, as shown in FIG. 2, and has an elongated hole 32 extending in the radial direction at the center thereof. Has been formed. The transmission member 31 has two projections 33, which project outwardly in the radial direction opposite to each other from the outer circumference of the transmission member 31, fitted in the groove 19 provided in the tubular portion 15 so as to be slidable in the axial direction, It is mounted on the elastic member 30. Reference numeral 34 denotes a sealing ring having elasticity, which is fitted in the mounting hole portion 3A of the recess 3.

Reference numeral 35 denotes a motor, which includes a motor main body 36, an output shaft 37 projecting from the motor main body 36 in the axial direction and having a diameter smaller than that of the elongated hole 32 of the transmission member 31. By fitting the reduced diameter step portion 38 of the motor main body 36 provided on the side where the output shaft 37 protrudes into the sealing ring 34, the inside of the recess 3 is sealed from the outside, It is mounted over the upper surface 2a of the pump body 2 and the upper surface 34a of the sealing ring 34, and is attached to the pump body 2 with bolts (not shown). At this time, the output shaft 37 has a key portion 39 having a substantially elongated cross section protruding from the lower surface 37a of the output shaft 37 fitted in the elongated hole 32 of the transmission member 31. The lower surface 37 a contacts the upper surface 31 a of the transmission member 31 and presses the elastic member 30 toward the rotor 15 via the transmission member 31. As a result, according to the rotation of the output shaft 37 of the motor 35, this rotation is transmitted to the rotor 15 via the transmission member 31, and the rotor 15 can be rotated. There is.

In mounting the motor 35 on the pump body 2, the elastic member 30 is provided between the receiving portion 3a of the recess 3 and the end portion of the rotor 15 and the lower surface 37a of the output shaft 37. Between the rotor 15 and the transmission member 31, the rotor 15 is provided so as to fill the gaps between the transmission member 31 and the other end of the rotor 15 and the transmission member 31. It is in the state of being compressed and deformed in the axial direction of. An inflow port 40 that connects the recess 3 and the inflow passage 6 is formed outside the radius of the engaging portion between the elongated hole 32 of the transmission member 31 and the output shaft 37 of the motor 35. It will be.

In such a structure, when the motor 35 of the hydraulic pump device 1 is operated to rotate the output shaft 37, this rotation is transmitted to the rotor 15 via the transmission member 31. As the rotor 15 rotates, the elastic member 30 suppresses the axial movement of the rotor 15 due to this rotation. The hydraulic fluid is supplied into the recess 3 via a pipe and a suction port (not shown), and the inflow path 6 of the pintle 5 opening into the tubular portion 18 from the inflow port 40 of the transmission member 31 above the rotor 15. Have been led to. Then, when one cylinder hole 17 communicates with the inflow passage 6 by the rotation of the rotor 15, the piston 20 is caused to have its head 22 by the inner force of the bearing 25 by the centrifugal force generated by the rotational movement of the rotor 15. The hydraulic fluid is sucked into the pressure chamber B because it abuts on the inner peripheral surface of the rotor 26 and moves outward of the rotor 15 while increasing the volume of the pressure chamber B.

Next, the cylinder hole 17 is blocked from the inflow passage 6 by the peripheral surface of the rotor 15, and the working fluid is supplied by the eccentric rotational movement of the rotor 15 and the bearing 25. The piston 20 on the cylinder hole 17 side gradually moves in the radial inward direction of the rotor 15. In this process, the volume of the pressure chamber B in the cylinder hole 17 is reduced by the movement of the piston 20, and the hydraulic fluid in the pressure chamber B is pressurized.

When the rotor 15 further rotates and the cylinder hole 17 communicates with the outflow passage 7, the pressurized hydraulic fluid flows into the outflow passage 7 and is supplied to the check valve 9 through the through hole 8. It At this time, the check valve 9 opens when the working fluid reaches a predetermined pressure and is sent to the accumulator of the vehicle brake system from the discharge passage (not shown).

In this way, the hydraulic pump device 1 reciprocally moves the piston 20 housed in the cylinder hole 17 by the eccentric rotation of the rotor 15 and the ball bearing 25, and the hydraulic fluid is sequentially operated. The operation of sucking and pressurizing is repeated, whereby the pressurized hydraulic fluid is stored in the accumulator.

According to the first embodiment described above, when the motor 35 is fitted into the rotor 15, the end portion of the rotor 15 and the output shaft 37 of the motor 35 are connected to each other. An elastic member 30 is interposed between the elastic member 30 and the receiving portion 3a of the recess 3 and the end of the rotor 15, between the lower surface of the output shaft 37 and the transmission member 31, and Since the rotor 15 is elastically positioned on the receiving portion 3a side of the recess 3 so as to fill the gap between the transmission member 31 and the other end portion of the rotor 15, the liquid described above is used. When the pressure pump device 1 is operated, the rotor 15 cannot move in the axial direction.

Second Embodiment A second embodiment of the present invention will be described with reference to the drawings.

In FIG. 3, the transmission member 31 is mounted on the rotor 15 by engaging the projection 32 with the groove 19 of the cylindrical portion 18 of the rotor 15.

Reference numeral 130 denotes a rubber plate-shaped elastic member having a diameter smaller than that of the transmission member 31 as shown in FIG. 4, and an elongated hole 130a extending in the radial direction is formed at the center thereof. The elastic member 130 has the elongated hole 130a fitted in the key portion 39 of the motor 35.

The motor 35 is attached to the pump main body 2 by fitting a key portion 39 of the output shaft 37 protruding downward from the elastic member 130 into the elongated hole 32 of the transmission member 31. As a result, the elastic member 130 is maintained on the output shaft 37 in a state of being compressed and deformed between the lower surface 37a and the transmission member 31. Since the other parts are the same as the structure shown in the first embodiment, the description of the same reference numerals is omitted.

In such a configuration, when the motor 35 of the hydraulic pump device 1 is operated to rotate the output shaft 37, this rotation is transmitted to the rotor 15 via the transmission member 37, As the rotor 15 rotates, the elastic member 130 suppresses the axial movement of the rotor 15 associated with this rotation. The hydraulic fluid is supplied into the recess 3 through a pipe and a suction port (not shown), and is opened from the upper part of the rotor 15 to the cylindrical part 18 through the inner circumference of the cylindrical part 18 and the outer circumference of the transmission member 31. It is guided to the inflow path 6 of the pintle 5. In addition, the method of pressurizing the hydraulic fluid that has flowed into the cylinder hole 17 and the like are the same as those described in the first embodiment, and thus the description thereof is omitted.

As described above, also in the second embodiment, the same effect as that of the first embodiment can be obtained. Incidentally, the elastic members 30, 130 in the above-mentioned first and second embodiments are made of rubber. Although a metal wave washer or the like may be used instead of this, a plurality of holes are provided in the transmission member 31 in order to communicate the recess 3 of the pump body 2 with the inflow passage 6. It may be

When the motor 35 is attached to the rotor 15, the output shaft of the motor 35 is, for example, the rotor 15 without the transmission member 31 interposed therebetween. It is also possible to provide a key groove that engages with the key portion 39 and directly connect the key portion.

[0028]

[Effect of the device]

 As described above in detail, according to the hydraulic pump device of the present invention, when the motor is fitted to the rotor, the elastic member outputs to the receiving portion-rotor between the end portions and the output. The shaft-rotor fills the gap between the other ends, and the end of the rotor that elastically positions the rotor on the receiving member side and the output shaft of the motor Since the rotor is prevented from moving in the axial direction when the pump is operating, it is mounted so as not to tighten the dimensional tolerances of each component and to prevent the motor from moving. -Noise and vibration can be reduced or prevented without deteriorating the ease of mounting on the motor.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a hydraulic pump device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a vertical cross-sectional view of a main part of a hydraulic pump device according to a second embodiment of the present invention.

4 is a cross-sectional view taken along the line AA in FIG.

[Explanation of symbols]

 2 Pump body (main body) 3 Recess 3a Receiving part 15 Rotor 20 Piston 25 Ball bearing (stator) 35 Motor 30, 130 Elastic member 37 Output shaft

Claims (1)

[Scope of utility model registration request] 1. A rotor rotatably housed in a main body,
A stator that is eccentrically provided on the radially outer side of the rotor, and a piston that reciprocates so that hydraulic fluid can be sucked and pressurized by the relative rotation of the stator and the rotor. A receiving portion provided on the main body and engageable with one end portion of the rotor, and another end portion of the rotor that is attached to the main body and has an output shaft capable of transmitting rotational force. To be fitted to
In a hydraulic pump device including a rotor, the rotor
Between the other end of the motor and the output shaft of the motor, an elastic member capable of urging the rotor toward the receiving portion is interposed.