JP2000080975A - Radial plunger pump - Google Patents

Abstract

(57) [Summary] To prevent a defective seat or the like of a check valve 30 on a discharge side. A mounting hole is provided on a discharge side of a pump housing.
The check valve 30 is inserted or press-fitted into the inside of the mounting hole 29, and the accumulator 28 is fixed to the opening side. The inner surface of the mounting hole 29 has an inclined surface 2 between the large-diameter hole 29b on the opening side and the small-diameter hole 29a on the inner side.
9c is formed. On the other hand, on the outer surface of the valve main body 32 of the check valve 30, an engaging portion 32d having a slope substantially coinciding with the slope of the inclined surface 29c is formed. When the valve body 32 is inserted into the mounting hole 29 and the inclined engaging portion 32d is engaged with the inclined surface 29c of the mounting hole 29, the valve seat 34 caulked at the tip of the valve body 32 is mounted. The hole 29 is separated from the bottom surface 29d. [Effect] At the time of press-fitting or insertion, there is no possibility that the caulked portion of the valve main body 32 is deformed by hitting the bottom surface 29d of the mounting portion 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a radial plunger pump, and more particularly to a radial plunger pump in which a check valve on the pump discharge side is press-fitted or inserted into a mounting hole provided in a pump housing.

[0002]

2. Description of the Related Art A conventional radial plunger pump used for operating a hydraulic brake booster will be described with reference to FIG. Suction passage 104d and discharge passage 104
e is formed in the pump housing 10.
2 and the outer periphery of the pintle 104 has a rotor 1
08 is rotatably fitted. A plurality of cylinder holes 108a are radially formed in the rotor 108, and a plunger 110 is slidably inserted into each of the cylinder holes 108a.
The plunger 110 is rotated in a ball bearing 116 press-fitted and fixed in the housing 102 while being eccentric to the center of rotation of the plunger 08 to move the plunger 110 forward and backward in the cylinder hole 108a.
The hydraulic oil is sucked and discharged by increasing or decreasing the volume of the hydraulic oil.

A mounting hole 129 is formed on the discharge side of the pump housing 102, and an oil port portion 128c of the accumulator 128 is screwed and fixed in the mounting hole 129. Further, a check valve 130 is provided between the pump side and the accumulator 128 so that the hydraulic oil discharged from the pump is sent to the accumulator 128 and the accumulated pressure does not escape to the pump side. Further, hydraulic oil is supplied to a booster of a brake booster (not shown) from a discharge passage and a discharge port formed in the pump housing 102 and communicating with the space 133 in the mounting hole 129.

The check valve 130 includes a cylindrical valve body 132, a valve seat 134 caulked at an opening of the valve body 132 on the inlet side, and a valve body 132.
And a ball valve 138 that is housed in the inside and is urged by a spring 136 to be seated on the valve seat 134. The valve body 132 is press-fitted into a mounting hole 129 of the pump housing 102 and fixed. An O-ring 139 is fitted around the outer periphery of the valve body 132 to maintain liquid tightness between the upstream side and the downstream side of the check valve 130. Note that the valve body 132 may be simply inserted without being pressed into the mounting hole 129.

[0005]

In the conventional radial plunger pump, when the check valve 130 is press-fitted or inserted into the mounting hole 129 of the pump housing 102, or when the pump is operating, the check valve 130 is swaged to the tip of the valve body 132. The mounted valve seat 134 has the mounting hole 129.
There was a problem that would hit the bottom of the. When the swaged portion of the valve seat 134 hits the bottom surface with a strong force during the press-fitting or insertion or during operation of the pump, the swaged portion is affected by deformation, and the valve seat 134 is affected.
There is a possibility that the seating property of the ball valve 138 may be deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned disadvantages, and prevents a valve seat caulked at the tip of a valve body from coming into contact with the bottom of a mounting hole to prevent deformation of the caulked portion. It is an object of the present invention to provide a radial plunger pump check valve having good seating properties.

[0007]

A radial plunger pump according to the present invention includes a pintle fixed in a pump housing and having a suction passage and a discharge passage formed therein;
A rotor rotatably fitted on the outer periphery of the pintle, a plunger slidably fitted in a radial cylinder hole formed in the rotor, and an eccentrically arranged rotor on the outer peripheral side of the rotor; A guide ring, and a check valve arranged in a mounting hole provided on the discharge side of the pump housing. The valve housing includes a valve body, a valve seat caulked to an inlet side of the valve body, and a valve body housed in the valve body and urged by a spring to be seated on the valve seat. A step is formed on the inner surface of the hole, and an engaging portion for engaging with the step is provided on the outer surface of the valve body. In a state where the engaging portion is engaged with the step, a valve seat is provided. It is obtained so as to be spaced apart from the bottom surface of the mounting holes caulking portion.

In the radial plunger pump according to the present invention, the check valve is provided on the outer surface of the valve body at the step formed on the inner surface of the mounting hole when the check valve is press-fitted or inserted into the mounting hole of the pump housing or during operation of the pump. The engaging portion is engaged, and the valve body is not pushed further into the mounting hole. Therefore, there is no possibility that the valve seat crimped at the end of the valve body or the swaged portion thereof will be deformed, so that the seating property of the valve body with respect to the valve seat does not deteriorate.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 is a longitudinal sectional view of a radial plunger pump according to one embodiment of the present invention, and FIG. 2 is an enlarged view of a main part thereof. In the drawing, reference numeral 2 denotes a cylindrical pump housing having a bottom, and a plurality of steps are formed inside. One end 4a of the pintle 4 is inserted into the small-diameter hole 2a on the bottom side (the left side in FIGS. 1 and 2) of the pump housing 2. A flange 4b is formed in an intermediate portion of the pintle 4, and the flange 4b is formed.
b is fixed to the bottom surface of the medium diameter hole 2b of the pump housing 2 by a plurality of bolts 6. These bolts 6 are seat bolts having a flange 6a provided on the head, and strengthen the fastening force so that the bolts 6 do not loosen due to vibration or the like during operation of the pump.

An end 4c on the other side (right side in FIGS. 1 and 2) of the pintle 4 projects into a large-diameter hole 2c of the pump housing 2, and a rotor 8 is rotatable around the outer periphery of the projected portion 4c. Is fitted. The rotor 8 has a plurality (three in this embodiment) of cylinder holes 8a radially provided at equal intervals in the circumferential direction. These cylinder holes 8a
A plunger 10 having a spherical tip is slidably fitted therein, and is urged outward by a spring 12 disposed in a space inside the plunger 10. The internal space between the bottom of each plunger 10 and the bottom of the cylinder hole 8a constitutes the pump chamber 14.

Each pump chamber 1 is provided inside the pintle 4.
A suction passage 4d and a discharge passage 4e for sucking and discharging the hydraulic oil are formed in the inside of the cylinder. A communication hole 8b is formed at the bottom of each cylinder hole 8a of the rotor 8, and the pump chamber 14 is sequentially connected to the suction passage 4d and the discharge passage 4e of the pintle 4 as the rotor 8 rotates. The downstream end of the discharge passage 4e in the pintle 4 has a large diameter, and the filter 15 is accommodated in the large diameter portion. The hydraulic oil discharged from the pump chamber 14 is:
When flowing out through the filter 15, abrasion powder and the like generated by sliding between the rotor 8 and the pintle 4 and sliding between the rotor 8 and the plunger 10 are removed.

The pump housing 2 on the outer peripheral side of the rotor 8
A ball bearing 16 as a guide ring is press-fitted and fixed in the large-diameter hole 2c. The center of the ball bearing 16 is eccentric from the rotation center of the rotor 8. On the other hand, a substantially cap-shaped shoe 18 is fitted to the tip of each plunger 10, and the spring 12
The plunger 10 urged by the
And resiliently contacts the ball bearing 16 via the inner race 16a. The outer surface of the shoe 18 has an arc shape that substantially matches the radius of the inner surface of the inner race 16 a of the ball bearing 16, and the inner surface of the shoe 18 has a spherical concave portion that almost matches the spherical surface of the tip of the plunger 10. It has become.

A motor 20 is fixed to the opening side of the bottomed cylindrical pump housing 2. Body 2 of motor 20
1 is the pump housing 2 side end.
Are inserted in the openings. O-ring 1 is provided between the inner surface of the opening of pump housing 2 and the outer surface of motor body 21.
9 are fitted to maintain liquid tightness, and a liquid chamber 23 is formed inside these. Output rod 2 of motor 20
2 has a prismatic shape and a cross section substantially L
It fits in a square hole provided in the upright portion 24a of the joint 24 having a letter shape. Also, this L-shaped joint 2
4 is engaged in a notch 8c formed in the rotor 8, and the rotation of the output rod 22 of the motor 20 is transmitted through the joint 24. The rotor 8 rotates. This joint 2
A coil spring 26 is arranged between the upright portion 24 a of the rotor 4 and the side surface of the rotor 8 to urge the rotor 8 toward the pintle 4 to prevent the rotor 8 from moving in the axial direction.

The rotor 8 fitted on the outer periphery of the pintle 4
Is movable in the axial direction of the pintle 4 and its movement is regulated by the spring 26 as described above. However, it may move toward the motor 20 due to vibration or the like. In this case, it is possible to move until it comes into contact with the stopper of the joint 24 connected to the tip of the output rod 22 of the motor 20, but in this embodiment, the communication hole formed in the inner peripheral surface of the rotor 8 8b and the axial widths of the suction passage 4d and the discharge passage 4e that are open to the outer peripheral surface of the pintle 4 are larger than in the conventional configuration, so that even when the rotor 8 moves to the stopper, The communication between the pump chamber 14 and the suction passage 4d and the discharge passage 4e is ensured.

An accumulator 28 is fixed on the end of the pump housing 2 on the side opposite to the motor 20 (left side in FIGS. 1 and 27). The mounting hole 29 formed in the pump housing 2 has a small diameter on the inner side 29a (downward in the figure) and a large diameter on the opening side 29b, and an inclined surface is provided between the small diameter hole 29a and the large diameter hole 29b. 29c are formed. A check valve 30 described later is inserted into the small-diameter hole 29a inside the mounting hole 29. A female screw is formed on the inner surface of the large-diameter hole 29b on the opening side, and the oil port 28c of the accumulator 28 is screwed into the female screw of the large-diameter hole 29b.

The check valve 30 has a substantially cylindrical valve body 32 having a small diameter portion 32a, a medium diameter portion 32b, and a large diameter portion 32c in order from the top in the figure.
A valve seat 34 caulked to the large-diameter portion 32c side end portion (below in the figure) of the large-diameter portion 32c is housed in the large-diameter portion 32c,
The valve seat 3 is urged by a spring 36.
4 and a ball valve 38 seated on a valve seat on the inner surface.

Further, the valve body 32 has a large diameter portion 32.
An engaging portion 32d having an inclination substantially matching the inclined surface 29c formed on the inner surface of the mounting hole 29 protrudes near the middle diameter portion 32b of the mounting hole 29c. And the valve body 3
A spring 40 is disposed between the flat upper surface of the second engaging portion 32d and the lower surface of the oil port portion 28c of the accumulator 28 to urge the valve body 32 downward,
The engaging portion 32d of the valve body 32 is pressed against the inclined surface 29c of the mounting hole 29. Large diameter portion 32 of valve body 32
The length of c is shorter than the length of the large diameter hole 29a of the mounting hole 29, and the valve body 32 is inserted into the mounting hole 29, and the valve body 3 is inserted into the inclined surface 29c of the mounting hole 29.
When the two inclined engaging portions 32 d are locked, the valve seat 34 caulked at the tip of the valve body 32 is separated from the bottom surface 29 d of the mounting hole 29. An O-ring 39 is fitted around the large diameter portion 32c of the valve body 32 to maintain liquid tightness.

The small diameter portion 32a of the valve body 32 has an elongated cylindrical shape and is inserted into the inside of a circular hole 28a formed in the oil port portion 28c of the accumulator 28, and the opening of the internal passage 32e is formed. It faces the accumulator 28 of the accumulator 28. Therefore, all the hydraulic oil discharged from the pump chamber 14 and flowing out after opening the check valve 30 is directly led into the accumulator 28 of the accumulator 28, so that the pulsation on the pump discharge side can be absorbed.

A gap is provided between the outer peripheral surface of the small diameter portion 32a of the valve body 32 and the inner peripheral surface of the circular hole 28a of the accumulator 28, and the medium diameter portion 32b and the small diameter portion of the valve body 32 are provided. 32a and the tip surface 28 of the oil port portion 28c of the accumulator 28.
A gap is also formed between the accumulator 28 and a part of a supply passage from the accumulator 28 to a hydraulic device (not shown) such as a hydraulic brake booster.

A space 33 is provided in the mounting hole 29 of the pump housing 2 around the middle diameter portion 32b of the valve body 32. The space 33 is formed by a discharge (not shown) formed in the pump housing 2. It is connected to hydraulic equipment such as a hydraulic brake booster through a passage and a discharge port. Further, a suction port and a suction passage (not shown) are formed in the pump housing 2. Hydraulic oil sucked from the reservoir passes between the pump housing 2 and the motor 20 through the suction port and the suction passage. The liquid enters the liquid chamber 23 and is introduced into the pump chamber 14 in the cylinder hole 8a via the suction passage 4d of the pintle 4.

Next, the operation of the radial plunger pump according to the above configuration will be described. When the rotor 8 is rotated by the rotation of the output rod 22 of the motor 20, the center of rotation of the rotor 8 and the center of the ball bearing 16 are eccentric, so that the plunger 10 is moved into the cylinder hole 8a with the rotation of the rotor 8. Reciprocates in the radial direction to increase or decrease the volume of the pump chamber 14.

In the suction stroke in which the plunger 10 protrudes outward, the hydraulic oil enters the liquid chamber 23 from a reservoir (not shown) through a suction port and a suction passage (not shown) of the pump housing 2, and further sucks the pintle 4. Passage 4
d and the cylinder hole 8a through the communication hole 8b of the rotor 8.
Is sucked into the pump chamber 14 on the bottom side of the pump.

As the rotor 8 rotates, the plunger 10
Is in the discharge stroke, the plunger 10 is pushed radially inward by the ball bearing 16 and the pump chamber 1
4 is reduced and the hydraulic oil is discharged. Pump room 1
Hydraulic oil discharged from the cylinder 4 is passed through a communication hole 8b at the bottom of the cylinder hole 8a to a discharge passage 4e formed in the pintle 4 and to a filter 1 stored downstream of the discharge passage 4e.
After passing through 5, it is sent to the check valve 30. The hydraulic oil that has flowed out by pushing and opening the ball valve 38 of the check valve 30 flows into the internal passage 32 of the small cylindrical portion 32 a of the valve body 32.
e is introduced into the accumulator of the accumulator 28. The operating oil that has once entered the accumulator 28 is supplied to the gap between the outer surface of the small diameter portion 32a of the valve body 32 and the inner surface of the hole 28a of the accumulator 28, the space 33 around the valve body 32a, and the discharge passage formed in the pump housing 2. And discharged through a discharge port, and supplied to hydraulic equipment such as a hydraulic brake booster (not shown).

As described above, the valve body 32 of the check valve 30 inserted into the mounting hole 29 of the pump housing 2 has a large-diameter portion 32c at the lower end and a middle-diameter portion 32 at the middle.
b having an inclined surface formed therebetween.
Is fixed to the inclined surface 29c of the mounting hole 29 by locking, so that the valve seat 34 caulked at the tip does not abut against the bottom surface 29d of the mounting hole 29 and is separated. . Therefore, when the check valve 30 is assembled or the pump is operating, the swaged portion of the valve seat 34 does not come into contact with the pump housing 2 and is deformed, so that it is possible to prevent a trouble such as a defective seat from occurring.

The valve body 3 of the check valve 30
2 may be inserted into the mounting hole 29 of the pump housing 2, and the engaging portion 32 d may be engaged with the inclined surface 29 c of the mounting hole 29, and the large diameter portion 32 c may be inserted into the mounting hole 29.
May be press-fitted into the large-diameter hole 29a. Further, in the above embodiment, the inclined surface 29 c is formed in the mounting hole 29 of the pump housing 2 so that the valve body 32
The engaging portion 32d is engaged with the inclined surface 29c.
The present invention is not limited to this, and a step perpendicular to this surface is formed on the inner peripheral surface of the mounting hole 29, and the valve body 3
Alternatively, a right-angled step formed on the outer surface of No. 2 may be engaged.

[0026]

As described above, according to the present invention, a pintle fixed in a pump housing and having a suction passage and a discharge passage formed therein, and a rotor rotatably fitted to the outer periphery of the pintle. A plunger slidably fitted in a radial cylinder hole formed in the rotor,
A guide ring disposed eccentrically to the rotor on the outer peripheral side of the rotor, and a check valve disposed in a mounting hole provided on the discharge side of the pump housing,
The check valve has a cylindrical valve body fitted to the inner periphery of the mounting hole while maintaining the liquid tightness, a valve seat caulked at the inlet side of the valve body, and a check valve housed in the valve body and attached to a spring. A radial plunger pump comprising a valve body which is biased and seated on a valve seat, wherein a step portion is formed on an inner surface of the mounting hole, and an engaging portion engaging with the step portion is formed on an outer surface of the valve body. Provided,
The caulked portion of the valve seat is separated from the bottom surface of the mounting hole in a state where the engaging portion is engaged with the step portion, so that the valve can be mounted at the time of assembling the check valve or during operation of the pump. Since the swaged portion of the valve seat of the main body does not hit the bottom surface of the mounting hole, it is possible to prevent the check valve from causing a defective seat due to deformation of the valve seat or the like.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the entirety of a radial plunger pump according to one embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the radial plunger pump.

FIG. 3 is a longitudinal sectional view of a conventional radial plunger pump.

[Explanation of symbols]

 2 Pump housing 4 Pintle 4d Pintle suction passage 4e Pintle discharge passage 8 Rotor 8a Cylinder hole 10 Plunger 16 Guide ring (ball bearing) 29 Mounting hole 29c Step of mounting hole (inclined surface) 29d Bottom of mounting hole 30 Check valve 32 Valve body 32d Engagement part of valve body 34 Valve seat 36 Spring 38 Valve body (ball valve)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H070 AA01 BB02 CC29 CC32 DD66 DD91 3H071 AA03 BB01 CC28 CC32 DD14 DD82

Claims (3)

[Claims] 1. A pintle fixed in a pump housing and having a suction passage and a discharge passage formed therein, a rotor rotatably fitted to an outer periphery of the pintle, and a radial cylinder hole formed in the rotor. A plunger slidably fitted to the rotor, a guide ring disposed eccentrically to the outer periphery of the rotor and a check valve disposed in a mounting hole provided on the discharge side of the pump housing. A check valve, a cylindrical valve body fitted to the inner periphery of the mounting hole while maintaining liquid tightness,
A radial plunger pump comprising a valve seat crimped on an inlet side of a valve body and a valve body housed in the valve body and urged by a spring and seated on the valve seat, wherein a step portion is provided on an inner surface of the mounting hole. And an engaging portion for engaging with the step portion is provided on the outer surface of the valve body, and the caulking portion of the valve seat is attached to the bottom surface of the mounting hole in a state where the engaging portion is engaged with the step portion. A radial plunger pump characterized by being separated from the pump. 2. An inner peripheral surface of the mounting hole is formed with an inclined step portion having a smaller diameter toward a bottom portion, and is engaged with an outer peripheral surface of the valve body with an inclination substantially matching the inclination of the step portion. The radial plunger pump according to claim 1, further comprising a portion. 3. A step formed on an inner peripheral surface of the mounting hole at right angles to the surface, and an engaging portion for engaging with the step is provided on an outer surface of the valve body. The radial plunger pump according to claim 1, wherein: