JP2580395Y2 - Pump device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump device which can be applied to a hydraulic power source such as a power steering device of an automobile.

[0002]

2. Description of the Related Art A pump device of this kind is often used in a bad environment such as an engine room of a car.
Therefore, as shown in, for example, Japanese Utility Model Laid-Open No. 1-95858, a puller provided at the end of the drive shaft is provided with a slinger plate for covering the end of the housing, and further, a shield plate is provided at the end of the housing. In order to prevent muddy water and the like from entering the housing and the bearing for supporting the drive shaft, some measures have been taken.

[0003]

However, in such a conventional example, the slinger plate and the shielding plate are manufactured as two separate parts, respectively, and each of the slinger plate and the shielding plate is press-fitted into the end of the housing at the time of driving or the housing. Since the structure is fixed by welding or the like, there has been a problem that the number of parts and the number of man-hours for mounting increase and the cost increases.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a housing in which a pump unit is housed, a drive shaft for rotating the pump unit, a bearing provided between the drive shaft and the housing, In a pump having a pulley attached to an end of a shaft, the pulley is provided with an annular flange surrounding the end of the housing, while the shape of the end of the housing is increased in diameter toward the pulley. It has a configuration formed in a shape.

[0005]

The intrusion of muddy water and the like is prevented by the flange portion and the minute gap formed between the flange portion and the housing. In addition, the end shape of the housing is formed in a tapered shape that expands in diameter toward the pulley side, so that when muddy water or the like tries to enter the gap between the housing and the pulley, It is blocked and muddy water is advantageously prevented.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing the overall structure of a pump device according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a housing, 2 denotes a drive shaft, and 3 and 4 denote bearings and bushes for supporting the drive shaft 2 respectively. Housing 1
Is formed with an annular recess 5 having an open end, in which a pump unit 6 is housed.
In this embodiment, the pump unit 6 includes a rotor 8 on which a plurality of vanes 7 are mounted so as to be able to protrude and retract in the radial direction.
A vane pump mainly including a cam ring 9 that rotatably accommodates the rotor 8 is shown. 10
Is a cover plate that covers the open end of the annular recess 5;
Is a side plate for holding the cam ring 9 with the housing 1.

The tip of the vane 7 attached to the rotor 8 is in sliding contact with the inner peripheral cam surface of the cam ring 9. A pump chamber 12 is formed by the cam ring 9, the rotor 8, and the two adjacent vanes 7. The volume of the pump chamber 12 changes due to the rotation of the rotor 8, and a suction section is formed at a portion where the volume increases due to the change, and a discharge section is formed at a portion where the volume decreases. The pump chamber 12 has a communication hole 13 formed in the side plate 11.
Through the cover plate 10 and the side plate 1
1 and a discharge chamber 14 formed between the discharge chambers.

A suction pipe 15 communicates with a reserve tank (not shown). The suction pipe communicates with a suction passage 16 provided in the housing 1 to guide hydraulic oil to the pump chamber 12. High pressure chamber 1
A flow control valve 18 is provided between the high-pressure passage 17 communicating with the high-pressure chamber 4 and the suction passage 16. And the discharge amount discharged to an actuator (not shown) communicating with the flow control valve 18 is controlled to a constant amount.

Reference numeral 19 denotes a synthetic resin pulley whose inner peripheral boss 19a is attached to the end of the drive shaft 2. The pulley 19 is provided with an annular flange 20 surrounding the end 1 a of the housing 1, and the inner peripheral surface thereof approaches the end 1 a of the housing 1, and a small gap 21 is formed between the pulley 19 and the housing 1. Has formed. The outer peripheral shape of the annular flange portion 20 is formed in a tapered shape converging toward the housing 1 side. On the other hand, the outer peripheral shape of the end 1a of the housing 1 is formed in a tapered shape whose diameter increases toward the pulley 19 side.

Reference numeral 22 denotes a belt wound around the pulley 19 and transmitting a rotational driving force to the pulley 19.

According to such a configuration, the rotor 8 of the pump unit 6 is rotated by the engine (not shown) via the pulley 19 and the drive shaft 2. As a result, the working oil pumped by the expanding / contracting pump chamber 12 is removed from the high pressure chamber
And is discharged from a discharge port (not shown) under flow control by the flow control valve 18.

At this time, muddy water or the like that is going to enter the housing 1 from the end 1a of the housing 1 is prevented from approaching the pulley 19 side because the end 1a of the housing 1 is first formed in a tapered shape. Further, the intrusion is prevented by the minute gap 21 formed between the annular flange portion 20 and the housing 1. Further, muddy water and the like adhering to the annular flange portion 20 are scattered outward by the rotation of the annular flange portion 20 to prevent muddy water and the like from entering the housing 1. In particular, muddy water or the like adhering to the annular flange portion 20 is advantageously prevented from entering the bearing 3 side.

Although the embodiment applied to the vane pump has been described, the present invention is not limited to this and can be applied to various pumps.

[0015]

As described above in detail, according to the present invention, a housing accommodating a pump unit, a drive shaft for rotating and driving the pump unit, and a bearing provided between the drive shaft and the housing. And a pump having a pulley attached to an end of the drive shaft, wherein the pulley is provided with an annular flange surrounding the end of the housing, and the shape of the end of the housing is shifted toward the pulley. By forming the tapered shape so that the diameter increases, the invasion of muddy water and the like is prevented by the annular flange portion and the minute gap formed between the annular flange portion and the housing.

Further, since the end of the housing is formed in a tapered shape, intrusion of muddy water is advantageously prevented. Furthermore, since the number of special parts does not increase, it can be easily assembled. Accordingly, intrusion of muddy water or the like can be prevented with a simple and easy-to-assemble configuration, and a very great effect can be obtained in practical use.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pump device showing one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1a End part 2 Drive shaft 3 Bearing 6 Pump unit 19 Pulley 20 Annular flange part

Claims (1)

(57) [Scope of request for utility model registration] 1. A housing accommodating a pump unit, a drive shaft for rotationally driving the pump unit, a bearing provided between the drive shaft and the housing, and a pulley attached to an end of the drive shaft. In the pump comprising: the pulley is provided with an annular flange surrounding the end of the housing, while the shape of the end of the housing,
A pump device having a tapered shape whose diameter increases toward the pulley.