JPH0415994Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a vane pump.

[Prior Art] A conventional vane pump whose vertical cross section is shown in FIG.
A first side plate 3a and a cam ring 2 are provided as functional parts in the functional chamber 12a of the pump housing 1a.
a, second side plate 4a, annular elastic body 6a,
The lid member 5a and the like are assembled in order. In this case, the annular elastic body 6a is attached to the second side plate 4 so that the first side plate 3a and the second side plate 4a can pinch the cam ring 2a from both ends.
It is assembled in a compressed state between the annular mounting recess 43a and the lid member 5a.

[Problems to be Solved by the Present Invention] According to the configuration of the conventional vane pump described above, since the annular elastic body 6a is accommodated in a compressed state, the annular elastic body 6a has a depth L2 that is smaller than the axial thickness L1.
Since the annular elastic body 6a is accommodated in the small-sized annular recess 43a, when the lid member 5a is attached to the other end 122a of the functional chamber 12a, the annular elastic body 6a is displaced, causing the annular recess 43a of the second side plate 4a to shift. There is a case where the assembly is carried out in the state shown in FIG. 5 in which it rests on the annular protrusion 44a surrounding the outer periphery of the attachment recess 43a. Then, the second side plate 4
It is not possible to obtain a proper biasing force that evenly presses against the shaft at symmetrical positions with respect to the shaft, and the second side plate 4a is tilted by the pressure of oil from the rotor 7a side, causing the rotor 7a and the second side plate 4a to tilt. 4
There was a problem in that the volumetric efficiency of the pump deteriorated due to increased oil leakage between the pumps.

When assembling the vane pump, this invention
The purpose of this is to prevent the annular elastic body from losing its normal biasing action due to positional deviation.

[Means for Solving the Problems] The vane pump of the present invention has a function chamber and a suction passage formed therein, a bearing chamber, one end communicating with the bearing chamber, and an open other end opposite to the one end. a cam ring housed in the functional chamber and having an inner circumferential surface forming a cam surface; a suction pipe disposed on both sides of the cam ring and communicating with the suction passage on a surface facing the cam ring; a pair of first and second side plates each forming a discharge port that communicates with the port and the discharge passage; a lid member that is attached and fixed to the other end of the opening; one of the first and second side plates; A vane pump comprising an annular elastic body disposed between the lid member and the first side plate and the second side plate urging the first and second side plates in pressure contact with the cam ring, the annular elastic body comprising a trough and a peak. It is characterized by having an annular body and at least a protrusion that is formed integrally with the annular body and that can be latched to one of the first and second side plates.

With this configuration, the annular elastic body can be held at the normal assembly position during assembly, and can be interposed in a compressed state between the second side plate and the lid member, and the annular elastic body can be placed in a compressed state between the second side plate and the lid member. A biasing force that reliably brings the two side plates into contact can be obtained.

[Function] The annular elastic body used in the vane pump of the present invention has the following properties:
an annular body consisting of valleys and peaks, and one of the first and second side plates integrally formed with the annular body;
Since the annular elastic body has a protrusion that can be locked to the first side plate and the first side plate when the vane pump is assembled,
After the cam ring and the second side plate are assembled in this order, the cam ring is installed in the annular mounting recess of the second side plate. In this case, the protrusion of the annular elastic body is housed in the exhaust hole formed in the recess of the second side plate. In this state, even if the lid member is attached to the other end of the opening of the functional chamber of the pump housing, the annular elastic body will not shift from its normal position and will be maintained in a compressed state between the second side plate and the lid member. . At the same time, the second side plate is maintained in pressure contact with the cam ring by the urging force of the annular elastic body.

[Effects] According to the present invention, it is possible to prevent the annular elastic body from shifting in position with the protruding portion that can be locked to the side plate, and the proper attachment to the side plate and cam ring can be prevented between the side plate and the lid member. force can be maintained.

Therefore, between the side plate and the cam ring,
A pressurized state is obtained that allows smooth pumping action.

Therefore, according to the present invention, it is possible to eliminate the problem of a decrease in volumetric efficiency of the pump due to positional deviation of the annular elastic body during the assembly process, which occurs in the conventional vane structure.

[Example] An example of the vane pump of the present invention is shown in Figures 1 and 2.
This will be explained based on FIGS.

The vane pump of the embodiment, as shown in cross section in FIG. 1, includes a pump housing 1, a cam ring 2, a pair of first and second side plates 3, 4, a lid member 5,
The annular elastic body 6 is a component.

Among the components, the pump housing 1, the cam ring 2, the pair of first and second side plates 3, 4, and the lid member 5 can basically be the same as those used in the past.

The feature of the present invention lies in the annular elastic body 6.

The pump housing 1 has a bearing chamber 11 inside,
It has one end 121 communicating with the bearing chamber 11, a functional chamber 12 with an open other end 122 formed on the opposite side of the one end 121, a suction passage 13, and a discharge passage 14.

The cam ring 2 is housed within the functional chamber 12 and has an inner peripheral surface 21 forming a cam surface. Further, a rotor 7 is housed within the cam ring 2 and has a plurality of vanes (not shown) that are in sliding contact with the inner circumferential surface 21 of the rotor 7 and are slidably held in the radial direction. The rotor 7 is spline-engaged with one end of a rotor shaft 9 rotatably supported on the pump housing 1 via a bearing metal 8, and is splined with a snap spring installed in a snap ring groove 91 provided on the outer periphery of one end of the rotor shaft 9. It is prevented from coming off by 92 and is rotatable together with the rotor shaft 9.

A pair of first and second side plates 3 and 4 are arranged on both sides of the cam ring 2, and have suction ports 31 and 41 communicating with the suction passage 13 and a discharge port 32 communicating with the discharge passage 14 on the surfaces facing the cam ring 2. , 42, respectively. Further, a pump chamber (not shown) is formed between the pair of first and second side plates 3, 4, the cam ring 2, and the rotor 7, which performs an expansion or compression process as the rotor 7 rotates. Ru. This pump chamber includes the discharge ports 32, 42 and the suction ports 31, 4.
1 is connected.

The lid member 5 is attached and fixed to the other open end 122 of the functional chamber 12 of the pump housing 1.
This lid member 5 has a seal portion 51 on its peripheral wall portion and is fixedly attached to the other end portion 122 of the opening with an annular stopper member 52 .

The annular elastic body 6 is disposed between the second side plate 4 and the lid member 5, and is arranged between the second side plate 4 and the lid member 5.
2 and the rotor 7. The annular elastic body 6 is used by being disposed in a recess 43 formed on the surface of the lid member 5.

The annular elastic body 6 has a trough 61 as shown in FIG.
1 and a mountain portion 612; and a second side plate 4 integrally formed with the annular body 61.
It is provided with a protrusion 62 that can be locked to. In this embodiment, the protrusions 62 are formed on the inner peripheral side of the annular body 61, and a plurality of protrusions 62 are formed on the circumference of the annular body 61 at equal intervals. (In addition, the protrusion 62 can also be formed on the outer circumferential side as a modification not shown.) Furthermore, the protrusion 62 formed on the annular main body 61 is connected to the exhaust pressure hole 3 of the second side plate 4.
3 and 34, and is disposed between the lid member 5 and the second side plate 4.

Further, the plurality of exhaust pressure holes 33 and 34 formed in the second side plate 4 apply a constant fluid pressure to a plurality of vanes (not shown) from the center direction of the rotor shaft 7 toward the outer circumference when the vane pump is operated. The plurality of vanes are slidably held in pressure contact with the inner peripheral surface 21 forming the cam surface of the cam ring 2 by applying pressure.

According to the configuration of the vane pump described above, in the process of assembling each element constituting the vane pump, the functions of First, the first side plate 3 is housed in the chamber 12, and then the cam ring 3 and the rotor 7 are housed therein. In this case, the rotor 7 is splined to one end of the rotor shaft 9. Also rotor shaft 9
A snap ring 92 is fitted into a snap ring groove 91 formed at the end of the rotor 7, and the rotor 7 is coupled to one end of the rotor shaft 9. After this, function room 1
A second side plate 4 is accommodated within the second side plate 2, and an annular elastic body 6 is disposed in an annular recess 42 of the second side plate 4. In addition, the annular elastic body 6 connects the plurality of protrusions 62 protruding from the troughs 611 of the annular body 61 to the exhaust pressure holes 33, 3 of the second side plate 4 with the troughs 611 seated in the recesses 43.
4 and is placed in a locked state. In this state, the lid member 5 is attached to the other open end 122 of the functional chamber 12 so that the peak 612 of the annular main body 61 comes into contact with it, and is fixed to the pump housing 1 by the annular fixing member 52. In addition, the annular elastic body 6 is in a state in which the valley portion 611 of the annular main body 61 is pressed against the second side plate 4 and the peak portion 612 is pressed against the lid member 5.
Moreover, it is disposed between the second side plate 4 and the lid member 5 in a compressed state.

As a result, the annular elastic body 6 always urges the second side plate 4, and the second side plate 4 uses its urging force to urge the rotor 7 and the cam ring 3, and the cam ring 3 and the rotor 7 1 bias the side plate 3. That is, due to the biasing action of the annular elastic body 6, the cam ring 2 and the rotor 7 are pressed from both sides by the pair of first and second side plates 3, 4, and are in a rotatable state in a tightly pressed state. keeping.

According to this embodiment of the vane pump of the present invention, the annular elastic body 6 is reliably held in its assembled position within the pump housing 1 by the protrusion 62 formed on the annular main body 61, and is easily assembled. It is possible to prevent the annular elastic body 6 from shifting in position at the time. Therefore, the annular elastic body 6 can apply an even pressing force to the second side plate 4 at a symmetrical position with respect to the rotor axis 9, and the second side plate 4 can be prevented from being tilted by the pressure of the oil on the rotor 7 side. Therefore, the volumetric efficiency of the pump does not decrease.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the main parts of a vane pump according to an embodiment of the present invention, with a lid member removed from a pump housing. Figure 2 is A in Figure 1.
FIG. 2 is a sectional view showing the entire vane pump in section at a position corresponding to line -A'. FIG. 3 is a perspective view of the annular elastic body incorporated in the vane pump shown in FIGS. 1 and 2. FIG. FIG. 4 is a longitudinal cross-sectional view showing the cross-sectional structure of a conventional vane pump. FIG. 5 is a front view of the vane pump shown in FIG. 4 with the lid member removed from the pump housing. FIG. 6 is a perspective view of an annular elastic body used in a conventional vane pump. FIG. 7 is a side view of the annular elastic body in FIG. 6. 1...Pump housing, 2...Cam ring,
3... First side plate, 4... Second side plate, 5... Lid member, 6... Annular elastic body, 61
... Annular main body, 611 ... Valley part, 612 ... Peak part, 62 ... Protrusion part.

Claims (1)

[Claims for Utility Model Registration] (1) A function chamber having a bearing chamber, one end communicating with the bearing chamber, and an open other end opposite to the one end, a suction passage, and a discharge passage. a cam ring housed in the functional chamber and having an inner circumferential surface forming a cam surface; a suction port and a discharge passage disposed on both sides of the cam ring and communicating with the suction passage on surfaces facing the cam ring; a pair of first and second side plates each forming a communicating discharge port; a lid member attached and fixed to the other end of the opening; and between one of the first and second side plates and the lid member. and an annular elastic body disposed in the cam ring for urging the first and second side plates in pressure contact with the cam ring. The first and second parts are integrally formed in the main body.
A vane pump characterized by having at least a protrusion that can be locked to one of the side plates. (2) The protrusion of the annular elastic body is formed on the inner peripheral side of the annular body, and the protrusion is housed in a pressure relief hole formed in one of the first and second side plates. A vane pump according to claim 1. (3) The vane pump according to claim 2, wherein a plurality of protrusions of the annular elastic body are formed on the circumference of the annular main body. (4) The vane pump according to claim 3, wherein the projections of the annular elastic body are formed at equal intervals on the circumference of the annular main body.