JPS63129183A - Vane pump - Google Patents

Abstract

PURPOSE:To prevent the generation of resistance due to sliding movement by rotatably fitting retainer plates concentrically with the inner peripheral space inside the edge wall of a housing and connecting a vane and the retainer plates by cams. CONSTITUTION:Retainer plates 14a and 14b are installed concentrically with the inner peripheral space 5 of a housing onto the annular recessed parts 13a and 13b on the inside surface of the opposed edge wall of the housings 1 and 2. Each vane 11a and the retainer plates 14a and 14b are connected through cams 16a and 17a. Therefore, the springing-out of the vane from a groove is restricted, and the vane can revolve in the noncontact state, and the abrasion of the vane due to the sliding resistance can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is directed to vane pumps, which are one type of rotary pump used in superchargers, compressors, etc.
related.

[Conventional technology]

Conventionally, a vane pump whose schematic configuration is shown in FIG. 5 has been widely known.

In the same figure, (31) is a housing, (32) is a rotor that is eccentrically inserted into the inner peripheral space of the housing (31) and rotatably supported by a single rotation shaft (33), (35a) ( 35b) (35c) is the rotor (3
2) A 0-rotation shaft that is a plate-shaped vane that is disposed so as to be freely projectable and retractable in the radial direction in vane grooves (34a) (34b) (34c) that are equally spaced and recessed so as to divide the outer circumferential side into three in the circumferential direction. (
33), when the rotor (32) rotates in the direction of arrow (X) in the figure, base 7 (35a) (35b) (35c
) protrudes in the outer radial direction due to centrifugal force, and rotates while its tip edge slides against the inner circumferential surface of the housing (31).

As mentioned above, the rotor (32) is connected to the housing (31).
Due to this rotation, the housing (31), rotor (32) and vane (35a)
(35b) Working space divided by (35c) (3Et
a) (38b) (38c) (The Q volume changes repeatedly to expand and contract, and the fluid sucked in from the suction port (37) is transferred to the discharge port (3).
Discharge from 1 day).

[Problem that the invention seeks to solve]

However, in the conventional vane pump described above, since the vanes slide at high speed on the inner circumferential surface of the housing, a decrease in rotational efficiency due to sliding resistance between the vane tip edge and the inner circumferential surface of the housing cannot be avoided. The heat generated by sliding inevitably leads to a significant drop in the volumetric efficiency of the conveyed fluid, and there are also problems in that the vanes expand, bending inside the housing, and causing significant wear.

In view of these problems, the present invention was made with the objective of preventing the generation of resistance and heat generation due to sliding and improving the efficiency with respect to rotation and volume.

[Means for solving problems]

In order to achieve this object, the vane pump of the present invention includes a rotor that is rotatably supported in an eccentric manner in the inner circumferential space of a housing, and a rotor that is disposed so as to be able to protrude and sink into a plurality of vane grooves that are recessed in the rotor. The structure has plate-shaped vanes provided, and sucks fluid from one side and discharges it to the other by utilizing repeated volume changes of the working space between the vanes as the rotor and the vanes rotate. A retainer plate coaxial with the inner peripheral space is rotatably fitted inside the end wall of the housing, and each vane and the retainer plate are connected by a cam to regulate protrusion of the vane from the vane groove. did.

[For production]

According to the present invention, the protrusion of the vanes from the vane groove is not regulated by contact with the inner circumferential surface of the housing, but is regulated by the engagement of each vane with the retainer plate inserted into the housing via the cam. The tip edge of the vane is regulated to draw a constant trajectory, and the vane can be rotated without contacting the inner surface of the housing.

〔Example〕

Embodiments of the vane pump according to the present invention will be described below with reference to the drawings.

In Figures 1 to 3, (ri) is the front housing, and (2) is the rear housing, both of which are lightweight and made of non-ferrous metals such as aluminum with a small coefficient of thermal expansion, and are integrally connected to each other by bolts (3). It is fixed. (4)
is an iron rotor that is eccentrically inserted into the inner circumferential space (5) of the housing, and a pole bearing (7a) that is located in the stepped part of the shaft hole of the front housing (1) and is prevented from being removed by a fixing ring (6). ) and rear housing (2)
The pulley (8) is inserted through these two housings (1) and (2) through a pole bearing (7b) which is located in the stepped part of the shaft hole and whose removal is prevented by a bearing cover (8).
The rotary shaft (10) is connected to a rotating shaft (10) to which driving force is transmitted.

(lfa) (llb) (llc) are plate-shaped vanes mainly made of carbon material with excellent sliding properties. The vane grooves (12a), (12b), and (12c) provided in the vane grooves (12a), (12b), and (12c) are respectively disposed so as to be able to protrude and retract (slide) in the radial direction. Each housing inner peripheral space (
The annular recesses (13a) and (13b) formed coaxially with 5) (coaxially with the inner circumferential surface of the front housing (1)) are provided with retainer plates made of non-ferrous metal such as aluminum.
(14a) and (14b) are ball bearings (
15a) and 15b, and are rotatably inserted. Each vane (11a011b) (llc) and its retainer plate (14a) (14b) have a cam (lea) (1
6b) (1[fc) (17a) (17b) (17c).

3 on the inner surface of (14a) (+4b) (retainer play)
Concave portions (22a) (22b) (22c) formed at equal intervals
)(23a)(23b)(23c) The cams (16a)(18b)...(17c) are fitted into the cams (16a)(18b)...(17c).

A first pin (18
a) (18b) (18c) (19a) (19b)
(19c) protrudes, and the ball bearing (24a) (
24b) (24c) (25a) (25b) (25
c) via the retainer plate (14a) (14b)
A vane (11a) is provided near the periphery of the other surface (inner surface) of the rotary disk.
Second pin (20a) engaging (Ilb) (llc)
(20b) (20c) (21a) (21b) (21c
) are provided protrudingly, and the second pins (20a) (20b), fists,
Engagement recesses (28a) (28b) (28
c) Rotatably engaged with (27a), (27b), and (27c). These engagement recesses (28a) (28b), fists, (27c) are each vane (11a011b) (tic)
The cam (lea) is provided near the outer end (tip) of the side end, and as shown in FIG.
) (17a) both pins (18a) (19a) (20a)
(21a) overlaps the vane (l la), and the second pin (20a) (21a) overlaps the first pin (18a) (1
It comes to be located near the outer end of 9a).

Next, the operation of the vane pump will be explained. When the rotating shaft (lO) and rotor (4) rotate due to the driving force from the pulley (9), the vanes (lla) (llb)
(lie) also rotates and the vane (lla) (llb) (
llc) to cams (16a) (lBb) 11...(17
C) via retainer play) (14a) (14b)
The retainer plate (14a) (to which torque is transmitted)
14b) rotates coaxially with respect to the inner peripheral surface of the housing;
Along with this, the cams (18a) (18b) and 1l-(17c) are fitted into the recesses (22a) (22b)+1...(23c) of the retainer plates (14a) and (14b).
As mentioned above, the rotor (0) rotates (revolutions) coaxially with respect to the inner circumferential surface of the housing, and since the rotor (0) is eccentrically attached to the inner circumferential surface of the housing, the vanes ( lla) and the cam (lea) (17a) become misaligned as they rotate (however, the cam (lea) (17a)
) overlaps again at the bottom position (180 degrees symmetrical with the top position) where it protrudes the most from base 714 (12a))
, due to this displacement, the cams (18a) (lBb)...11
(17c) via retainer plate (14a) (14
b) vanes (lla) (llb) (llc
) is the vane groove (12a) (12b) (12
c) in the radial direction and repeatedly protrude and retract, thereby removing both housings (1) (2), rotor (4) and vane (lla).
) (llb) (lie) The volume of the working space (5) is repeatedly increased and decreased to transfer fluid from an inlet (not shown) to an outlet. In the above operation, the vane (lla)
(llb) (llc) are vane grooves (12a) (12b)
Since the protrusion from (12c) is regulated and the leading edge rotates without contacting the inner circumferential surface of the housing, loss of torque can be eliminated and wear and heat generation can be prevented.

FIG. 4 shows another embodiment of the invention, in which the cams (18a) (17a) overlap the vanes (11a) in the top position.
The second pins (20a) (21a) of the first pin (18
a) It is configured to be located closer to the inner end than (19a), and is formed at the side end of each vane (lla) (Ilb) (lie).
7c) is provided near the inner end of the side end. Since the other configurations are the same as those of the first embodiment, only the reference numerals are given and the explanation will be omitted.

In the above re-example, the vane whose protrusion is regulated (
lla) (llb) (llc) The locus of the tip edge is not necessarily a perfect circle, so when designing the pump, it is desirable to adjust the dimensions and arrangement of each part to make the trajectory closer to a perfect circle. Align the inner peripheral surface of the housing with the above trajectory without making it a perfect circle.

The clearance between the tip edge of the base 7 (lla) (llb) (tic) and the inner circumferential surface of the housing may be kept equal over the entire circumference.

〔Effect of the invention〕

As explained above, the vane pump of the present invention includes a rotor eccentrically and rotatably supported in the inner peripheral space of a housing, and a plurality of vane grooves recessed in the rotor. The housing has a structure in which fluid is sucked from one side and discharged to the other by utilizing repeated volume changes of the working space between the vanes as the rotor and the vanes rotate. A retainer plate coaxial with the inner peripheral space is rotatably fitted inside the end wall, and each vane and the retainer plate are connected by a cam to regulate protrusion of the vane from the vane groove,
Since the vane is configured to rotate without contacting the inner peripheral surface of the housing, it prevents a decrease in rotational efficiency due to sliding resistance and wear of the vane, and also prevents problems such as a decrease in volumetric efficiency due to increased heat generation due to sliding. It has an excellent effect of being able to prevent the occurrence.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing one embodiment of the vane pump according to the present invention, Fig. 2 is an exploded perspective view of the main parts, Fig. 3 is an explanatory diagram of the operation, and Fig. 4 is an explanation showing another embodiment. Figure, 5th
The figure is a sectional view showing a schematic configuration of a conventional vane pump. (1) Front housing (2) Rear housing (
4) Rotor (5) Inner space (7) (7a) (15a) (15b) (24a) (24
b) ---(25c) Ball bearing (10)
Rotating shaft (+1a011b011c) Vane (+2a) (12b) (12c) Vane groove (13a) (
13b) Annular recess (+4a) (14b) Retainer plate (lea) (l
llb)...(17c) Cam(18a)(lsb)・
...(19c) First pin for retainer plate engagement (20a) (20b)...(21C) Second pin for vane engagement (22a) (22b)...(23C) Recessed portion (2Ba)
(26b)...(27C) Engagement recess 11a 12b 12c

Claims (4)

[Claims] (1) It has a rotor that is eccentrically and rotatably supported in the inner circumferential space of the housing, and plate-shaped vanes that are disposed so as to be able to protrude and retract into a plurality of vane grooves that are recessed in the rotor. death,
Fluid is sucked in from one side by utilizing repeated volume changes in the working space between each vane as the rotor and vanes rotate,
In the structure for discharging to the other side, a retainer plate that is coaxial with the inner circumferential space is rotatably fitted inside the end wall of the housing, and each vane and the retainer plate are connected by a cam to discharge from the vane groove. A vane pump characterized by regulating the protrusion of the vane. (2) Each of the cams connecting the vanes and the retainer plate has a protruding pin that engages with the retainer plate at the center of one surface of the rotary disk, and a protruding pin that engages with the vane near the periphery of the other surface. A vane pump according to claim 1, characterized in that the vane pump is characterized in that: (3) The vane pump according to claim 2, wherein a vane engagement pin protruding from the cam is engaged with an engagement recess provided near the outer end of the vane side end. (4) The vane pump according to claim 2, wherein a vane engagement pin protruding from the cam is engaged with an engagement recess provided near an inner end of the vane side end.