JPH0141918Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to a vane pump in which an oil introduction groove is formed on the sliding surface of a side plate that comes into sliding contact with the side surface of a rotor.

<Prior art> In a general vane pump, a rotor that holds multiple vanes so that they can slide in the radial direction is rotatably housed in a cam ring, and a side plate is brought into sliding contact with the side of the rotor to seal the pump chamber. It is configured to do this.

However, in order for the rotor to rotate smoothly in such conventional vane pumps, it is necessary to form an oil film of an appropriate thickness between the rotor side surface and the side plate. There was a risk that the rotor would come into close contact with the side plate, causing oil to run out, and seize between the rotor and the rear side plate.

<Purpose of the invention> Therefore, the invention introduces oil between the rotor and the side plate to form an oil film between the two to prevent seizure. Another purpose is to reduce oil leakage and improve the volumetric efficiency of the pump.

<Structure of the Invention> The present invention relates to a vane pump characterized in that an oil introduction groove, one end of which communicates with an arcuate groove, is spirally formed in a direction opposite to the rotational direction of the rotor on a surface of a side plate that is in sliding contact with a rotor.

<Examples> Examples of the present invention will be described below based on the drawings. In FIG. 1, reference numeral 10 indicates a pump housing, and the pump housing 10 has a hollow chamber formed therein, the open end of which is closed with an end cover 11. Inside the hollow chamber of the pump housing 10 there is a cam ring 12 and side plates 1 on both sides of the cam ring 12.
3 and 14 are accommodated. A rotor 15 is rotatably housed within the cam ring 12, and the rotor 15 is splined to a rotating shaft 16 rotatably supported on the pump housing 10. Rotor 1
A vane groove 18 (FIG. 2) is formed on the circumference of the vane 5 to accommodate a plurality of vanes 17 slidably in the radial direction. A plurality of pump chambers partitioned by vanes 17 are formed between the cam ring 12 and the rotor 15, and the pump chambers that perform the expansion stroke are connected to the suction passage 34 through suction ports 19 and 20.
Further, a pump chamber that performs a compression stroke is connected to a discharge passage 30 via a discharge port 21.

In the side plates 13 and 14 that are in sliding contact with both side surfaces of the rotor 15, discharge ports 21 and 22, which are arcuate long holes, are formed corresponding to the pump discharge areas, respectively. The inner discharge port 21 is located on the front side plate 1
It penetrates from one side of 3 to the other side. Furthermore, arcuate grooves 23 and 24 are formed on the side surfaces of the side plates 13 and 14 in correspondence with the vane grooves 18, as shown in FIG. The vane groove 18 is configured to introduce discharge fluid into the vane groove 18.

In such a pump, the rotor 15 is pushed toward the rear side plate 14 by its internal pressure, and seizure is likely to occur. Therefore, in the present invention, an oil introduction groove 35 is formed on the sliding surface of the side plate 14 that slides into contact with the side surface of the rotor 15. This oil introduction groove 35 has one end connected to the arcuate groove 2.
3 and 24, and by actively introducing oil under pressure, an oil film is reliably maintained between the rear side plate 14 and the rotor 15. Also, this oil introduction groove 35
is spirally formed in a counterclockwise direction, that is, in a direction opposite to the rotation direction of the rotor 15, assuming that the rotation direction of the rotor 15 is clockwise in FIG. Therefore, when the rotor 15 is rotated, the oil flows counterclockwise in the oil introduction groove 35 in the clockwise direction in FIG. becomes less,
It acts to prevent the volumetric efficiency of the pump from decreasing.

In the above embodiment, the oil introduction groove is formed only on the sliding surface of the rear side plate, but the oil introduction groove is not limited to this, and the oil introduction groove may also be formed on the sliding surface of the front side plate. Good too.

<Effects of the invention> As detailed above, the vane pump of the invention has an oil introduction groove spirally formed in the opposite direction to the rotor rotational direction on the surface of the side plate that comes into sliding contact with the rotor. Since one end is configured to communicate with the arcuate groove, an oil film can be reliably formed between the rotor and the side plate, and seizure can be completely prevented. Furthermore, the rotation of the rotor can be used to cause the oil in the oil introduction groove to flow backward, thereby reducing oil leakage. As a result, it is possible to reduce the amount of discharged oil supplied to the oil introduction groove, and it is possible to prevent the volumetric efficiency of the pump from decreasing.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional view of a vane pump, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is a view taken along the - line in FIG. 10... Pump housing, 12... Cam ring, 13, 14... Side plate, 21, 22
...Discharge port, 23, 24...Circular groove, 35...
...Oil introduction groove.

Claims (1)

[Scope of utility model registration request] A rotor is rotatably disposed inside the cam ring, vane grooves are formed in the rotor in the radial direction at a plurality of angular positions, and each vane groove slidably accommodates a vane that comes into sliding contact with the inner periphery of the cam ring. A side plate is arranged on the side of the vane, and an arcuate groove is formed on the rotor side surface of this sideplate to which the discharged pressure oil is supplied, and the pressure oil supplied to this arcuate groove is transferred to the lower part of the vane. A vane pump configured to lead to a vane groove, characterized in that an oil introduction groove, one end of which communicates with the arcuate groove, is spirally formed in a direction opposite to the rotating direction of the rotor on a surface of the side plate that slides on the rotor. .