JPH08200268A - Vane pump - Google Patents

Abstract

PURPOSE: To provide a vane pump wherein wearing a vane and generating heat can be surely prevented without generating improper lubrication of the vane making an advancing/retracting motion in a vane chamber. CONSTITUTION: In a vane pump 10, a lubricating oil supply path 34 is formed in a rotor 12. In the lubricating oil supply path 34, a lubricating oil chamber 30 provided in a rotary shaft 18 communicates with a sliding part 36 in a rotational direction rear side of the rotor of a vane chamber 22. Consequently, lubricating oil in the lubricating oil chamber 30 is partly supplied directly to the sliding part 36, to prevent generating improper lubrication of a vane 24 (vane chamber 22). Accordingly, even when a large load acts in the vane 24 in a compression stroke (pump chamber P in compression side), wearing the vane 24 and generating heat can be surely prevented.

Description

Detailed Description of the Invention

[0001]

This invention relates to vane pumps.

[0002]

2. Description of the Related Art A vane pump used, for example, in an air conditioner of a vehicle is provided with a rotor which is housed in a housing and is rotated by an eccentric rotary shaft. A plurality of grooved vane chambers are formed in the rotor along the radial direction, and the vanes are housed in the vane chamber so that the vanes can move back and forth. A pump chamber is formed by these housing, rotor, and vane. When the vane pump is driven, when the rotor rotates together with the rotating shaft, the vanes move along the inner peripheral surface of the housing while moving forward and backward, and the fluid sucked from the suction port is compressed in the pump chamber and discharged from the discharge port. Is ejected.

In order to reduce the friction torque of the vane, there has been proposed a vane pump configured to generate a vane pressure (a force for bringing the vane into pressure contact with the inner peripheral wall of the housing) by the pressure of the pump chamber (Japanese Patent Laid-Open No. HEI-1). −
No. 100397).

In the vane pump disclosed in the above publication, the compression side pump chamber on the front side in the rotational direction of the vane and the bottom portion of the vane chamber in which the vane is retractably retractable are connected by a communication passage. As a result, in the early stage of driving the vane pump (the initial stage of rotation of the rotor), the pressure in the compression-side pump chamber is not high, so the vane pressure is small, the friction torque is small, and the driving power and wear can be reduced.
On the other hand, as the rotation of the rotor progresses, the pressure in the compression side pump chamber increases, the vane pressure also increases, and chattering of the vanes and the like are prevented.

However, in the vane pump disclosed in the above publication, although the friction torque between the vane and the housing can be reduced to reduce the driving power and wear to some extent,
There was a drawback that poor lubrication of the vane (vane chamber) was likely to occur.

That is, when the vane rotates together with the rotor, the vane moves forward and backward while contacting the wall surface on the rear side in the rotational direction of the vane chamber, but in the conventional vane pump as described above, the lubrication supplied to the vane chamber is performed. Since the oil is simply supplied through the lubricating oil passage formed on the rotary shaft, poor lubrication easily occurs in the sliding contact portion with the wall surface of the vane chamber. In particular, in the compression process (compression side pump chamber), a large load acts on the vane along the rotor rotation direction, so that the lubrication failure is likely to occur. In such a case, wear and heat generation of the vane will occur.

[0007]

In consideration of the above facts, the present invention provides a vane pump capable of reliably preventing wear and heat generation of a vane without causing poor lubrication of the vane moving forward and backward in the vane chamber. That is the purpose.

[0008]

A vane pump according to a first aspect of the present invention includes a rotor housed in a housing and rotated by a rotating shaft, and a groove-shaped vane chamber formed along the radial direction of the rotor. A vane pump comprising: a vane that is retractably housed; a pump chamber formed by the housing, the rotor, and the vane; and a lubricating oil chamber that is formed on the rotating shaft and supplies lubricating oil to the vane chamber. Among the vane chambers that slide with the vanes when the rotor rotates, the sliding portion on the rear side in the rotor rotation direction communicates with the lubricating oil chamber, and the lubricating oil in the lubricating oil chamber is directly supplied to the sliding portion. A feature is that a lubricating oil supply means is provided.

A vane pump according to a second aspect of the present invention is the vane pump according to the first aspect, further comprising communication means for communicating the compression side pump chamber and the lubricating oil chamber on the front side in the rotor rotation direction with respect to the vane. It is characterized by that.

[0010]

In the vane pump according to the first aspect of the present invention, when the rotor rotates together with the rotary shaft, the vane moves along the inner peripheral surface of the housing while moving back and forth, and the fluid is compressed and discharged in the pump chamber.

Here, the sliding portion of the vane chamber on the rear side in the rotational direction of the rotor is communicated with the lubricating oil chamber formed on the rotating shaft by the lubricating oil supply means. A part is directly supplied to the sliding part of the vane chamber. Therefore, the sliding contact portion between the vane and the wall surface of the vane chamber does not cause poor lubrication. For this reason, even if a large load along the rotor rotation direction acts on the vane in the compression process (pump chamber on the compression side), the lubrication failure does not occur and the wear and heat generation of the vane can be reliably prevented.

In the vane pump according to the second aspect, the compression side pump chamber on the front side in the rotor rotation direction with respect to the vane is communicated with the lubricating oil chamber by the communicating means, so that a part of the lubricating oil in the compression side pump chamber is , Is returned to the lubricating oil chamber again, and is further directly supplied to the sliding portion of the vane chamber by the lubricating oil supply means. That is, the supply of the lubricating oil to the sliding portion by the lubricating oil supply means can be assisted, and the supply of the lubricating oil to the sliding portion becomes more reliable.

Further, since the compression side pump chamber is communicated with the vane chamber by the communication means, the lubricating oil chamber and the lubricating oil supply means, the pressure generated in the compression side pump chamber is transferred to the vane chamber (suction side pump chamber). Leakage can be performed, and the pressure can act as a repulsive force against the vane pressing force. Therefore, the load on the vane can be reduced.

[0014]

1 is a vertical sectional view showing the structure of a vane pump 10 according to a first embodiment of the present invention, and FIG. 2 is a side view in which the entire structure of the vane pump 10 is partially broken. Is shown.

The vane pump 10 is provided with a case 12 as a housing, and a side plate 14 as a housing is fixed to an open end of the case 12. A rotating shaft 18 is eccentrically supported by a bearing 16 in the case 12, and the rotating shaft 18 is further supported.
A rotor 20 is integrally attached to the. The rotor 20 is formed in a cylindrical shape, and a plurality of (four in this embodiment) vane chambers 22 are formed radially at equal intervals in the circumferential direction in the radial direction.
Each of the vanes 24 is housed therein so that it can be moved back and forth. Each vane 24 housed in the vane chamber 22 has its tip portion in contact with the inner peripheral surface of the case 12, and the pump chamber P is formed by the case 12, the side plate 14, the rotor 20, and the vane 24. It is a composition.

In the case 12 and the side plate 14,
An intake port 26 and a discharge port 28 that communicate with the pump chamber P are formed.

Further, a lubricating oil chamber 30 is provided between the rotor 20 and the rotor 20 at the axis of the rotary shaft 18, and the case 1
2 and the lubricating oil passage 32 formed in the side plate 14. As a result, the lubricating oil can be supplied to the vane chamber 22.

Further, as shown in FIG. 3, the rotor 20 is provided with a lubricating oil supply passage 34 as a lubricating oil supply means. The lubricating oil supply passage 34 has an opening at one end, which is the lubricating oil chamber 30.
The other end opening is located at the sliding portion 36 on the rear side in the rotor rotation direction of the vane chamber 22 that slides on the vane 24 when the rotor 20 rotates. That is, the lubricating oil supply passage 34 connects the lubricating oil chamber 30 and the sliding portion 36. Thereby, a part of the lubricating oil in the lubricating oil chamber 30 is directly supplied to the sliding portion 36.

In the vane pump 10 having the above structure, when the rotor 20 rotates in the direction of arrow A in FIG. 1 together with the rotating shaft 18, the vanes 24 move along the inner peripheral surface of the case 12 while moving forward and backward in the vane chamber 22. The fluid sucked from the suction port 26 is compressed in the pump chamber P and discharged from the discharge port 28.

Here, the sliding portion 36 of the vane chamber 22 on the rear side in the rotor rotation direction is formed by the lubricating oil supply passage 34.
Since it is communicated with the lubricating oil chamber 30 formed in the rotating shaft 18, a part of the lubricating oil in the lubricating oil chamber 30 is partially removed from the vane chamber 22.
It is directly supplied to the sliding portion 36 of. Therefore, vane 2
4 does not cause poor lubrication in the sliding portion 36 between the vane chamber 22 and the wall surface of the vane chamber 22. Therefore, in the compression process (pump chamber P on the compression side), even if a large load along the rotor rotation direction acts on the vane 24, the vane 2 does not cause poor lubrication.
The wear and heat generation of No. 4 can be reliably prevented.

Next, another embodiment of the present invention will be described. The parts that are basically the same as those in the first embodiment have the first
The same reference numerals as in the embodiment are given and the description thereof is omitted.

FIG. 4 is a longitudinal sectional view showing the structure of the vane pump 40 according to the second embodiment of the present invention.

In the vane pump 40, the rotor 20 has a communication passage 42 as a communication means. The communication passage 42 has one end opening located in the compression-side pump chamber P on the front side in the rotor rotation direction with respect to the vane 24, and the other end opening located in the lubricating oil chamber 30. That is, the communication passage 42 connects the pump chamber P on the compression side and the lubricating oil chamber 30. As a result, a part of the lubricating oil in the compression-side pump chamber P is returned to the lubricating oil chamber 30.

In the vane pump 40 having the above structure, the compression side pump chamber P on the front side in the rotor rotation direction is communicated with the lubricating oil chamber 30 by the communication passage 42. A part of the vane chamber 22 is returned to the lubricating oil chamber 30 again, and the vane chamber 22 is again supplied by the lubricating oil supply passage 34.
It is directly supplied to the sliding portion 36 of. That is, the supply of the lubricating oil to the sliding portion 36 by the lubricating oil supply passage 34 can be assisted. Therefore, the supply of the lubricating oil to the sliding portion 36 becomes more reliable.

Further, in the vane pump 40, the compression-side pump chamber P is communicated with the vane chamber 22 by the communication passage 42, the lubricating oil chamber 30, and the lubricating oil supply passage 34.
The pressure generated in the compression-side pump chamber P can be leaked to the vane chamber 22 (suction-side pump chamber P), and the pressure can act as a repulsive force against the vane pressing force. Therefore, the load on the vane 24 can be reduced.

[0026]

As described above, the present invention has the following effects.

In the vane pump according to the first aspect of the present invention, since a part of the lubricating oil in the lubricating oil chamber is directly supplied to the sliding portion of the vane chamber, the sliding contact portion between the vane and the wall surface of the vane chamber may cause poor lubrication. There is no. For this reason, even if a large load along the rotor rotation direction acts on the vane in the compression process (pump chamber on the compression side), the lubrication failure does not occur and the wear and heat generation of the vane can be reliably prevented.

In the vane pump according to the present invention, a part of the lubricating oil in the compression side pump chamber is returned to the lubricating oil chamber and directly supplied again to the sliding portion of the vane chamber. The supply of lubricating oil to the sliding parts can be assisted, and the supply of lubricating oil to the sliding parts becomes more reliable. Furthermore, the pressure generated in the compression side pump chamber can be leaked to the vane chamber, and the pressure can act as a repulsive force against the vane pressing force, so that the load on the vane can be reduced. .

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the structure of a vane pump according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway side view showing the configuration of the vane pump according to the first embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view showing details of a lubricating oil supply passage of the vane pump according to the first embodiment of the present invention.

FIG. 4 is a vertical sectional view showing the structure of a vane pump according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 vane pump 12 case (housing) 14 side plate (housing) 18 rotating shaft 20 rotor 22 vane chamber 24 vane 30 lubricating oil chamber 34 lubricating oil supply passage (lubricating oil supply means) 36 sliding part 40 vane pump 42 communication passage (communication means) ) P pump room

Claims (2)

[Claims] 1. A rotor housed in a housing and rotated by a rotating shaft, a vane housed in a groove-shaped vane chamber formed along a radial direction of the rotor so as to be able to move back and forth, the housing, the rotor. And a pump chamber formed by the vane, and a lubricating oil chamber formed in the rotary shaft for supplying lubricating oil into the vane chamber, wherein the vane chamber slides with the vane when the rotor rotates. A vane pump, characterized in that a lubricating oil supply means is provided which communicates a sliding portion on the rear side in the rotor rotation direction with the lubricating oil chamber and directly supplies the lubricating oil in the lubricating oil chamber to the sliding portion. 2. The vane pump according to claim 1, further comprising a communicating means for communicating the compression side pump chamber and the lubricating oil chamber on the front side in the rotor rotation direction with respect to the vane.