JPH10306782A - Vane pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a vane pump as compact as possible in the radial direction by improving a coil spring support body in the vane pump. SOLUTION: A vane pump 1 includes vanes 6 enclosed in a radially advancing/retreating state in a plurality of recessed parts 5a provided at the periphery of a rotor 5, a coil spring 7 enclosed in a hole part 6a opened to the inner end side of each vane 6 so as to energize the vane 6 springly outward in a radial direction, and a support body 8 disposed on the bottom side of the recessed part 5a so as to support the coil spring 7. The support body has a base part 9 formed of an elastically deformable plate, and a protruding part 10 provided in a position corresponding to the hole part 6a in the base part 9 and fitted with the coil spring 7 to its outer periphery. The base part 9 is bent so as to allow radial elastic expansion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a vane pump. This vane pump is used, for example, in a drive connection device for four-wheel drive.

[0002]

2. Description of the Related Art A conventional vane pump of this type is disclosed in Japanese Utility Model Laid-Open No. 2-122191.

In this publication, a coil spring for elastically urging the vanes radially outward is provided with a base portion made of a band-shaped metal plate bent substantially in a U-shape in side view, and a midway in the longitudinal direction of the base portion. It is supported by a spring holding member composed of pins that are implanted at two places. Note that the entire base portion is substantially flat, and is brought into close contact with the bottom surface of the concave portion of the rotor.

[0004]

However, in the above conventional example, there is room for improvement in downsizing the vane pump, which is increasingly required in recent years.

For example, since the resilient urging force on the vane relies solely on the spring force of the coil spring, it is necessary to adjust the length dimension or winding diameter of the coil spring to obtain a required resilient urging force.

However, in the case where the winding diameter of the coil spring is reduced to increase the length, the depth of the hole of the vane must be increased, and the vane is required to maintain the strength of the vane. It is necessary to increase the radial dimension. In the case where the length of the coil spring is shortened to increase the winding diameter, the thickness of the vane must be increased, and the circumferential width of the concave portion of the rotor needs to be increased. Thus, in any case, miniaturization of the vane pump in the radial direction is the limit.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the support of a coil spring in a vane pump to promote miniaturization in the radial direction as much as possible.

[0008]

According to a first aspect of the present invention, there is provided a vane pump which is housed in a plurality of recesses provided on an outer periphery of a rotor so as to be able to advance and retreat in a radial direction, and is housed in a hole opened to the inner end side of the vane. And a coil spring that urges the vanes radially outward and a support that is disposed on the bottom side of the concave portion and supports the coil spring. The support is a base made of an elastically deformable plate. A base, and a protrusion provided at a position corresponding to the hole in the base and having a coil spring fitted therein, and the base allows elastic expansion and contraction in a radial direction. It is bent so that

A second vane pump according to the present invention includes a vane housed in a plurality of recesses provided on the outer periphery of a rotor so as to be able to advance and retreat in a radial direction, and a vane housed in a hole opened to the inner end side of the vane to radially move the vane. A coil spring that elastically urges outward,
A support disposed on the bottom side of the recess for supporting the coil spring, the support comprising a base portion formed of an elastically deformable band-shaped plate seated on the bottom of the recess, and the base portion; And a convex portion formed of a pin to which one end of the coil spring is fitted in the middle in the longitudinal direction, and the band-shaped plate serving as the base portion allows elastic expansion and contraction in the radial direction. It is bent. A third vane pump according to the present invention includes a vane housed in a plurality of recesses provided on the outer periphery of the rotor so as to be able to advance and retreat in the radial direction, and a vane housed in a hole opened to the inner end side of the vane to move the vane radially outward. It includes a coil spring that resiliently biases and a support that is disposed on the bottom side of the concave portion and supports the coil spring, and the support is formed by bending an elastically deformable band-shaped plate, Both ends in the longitudinal direction are a base portion to be seated on the bottom of the concave portion, and a middle portion in the longitudinal direction is bent into a U-shape to be a convex portion on which the coil spring is fitted, and the base portion is Are bent to allow elastic expansion and contraction in the radial direction.

In the present invention, the size of the coil spring can be reduced by providing the coil spring support with a spring function. For example, it is possible to shorten the length of the coil spring used or to reduce the diameter of the winding in terms of the spring force of the support. This makes it possible to reduce the radial dimension or circumferential width of the vane.

By the way, in any one of the first to third vane pumps, a locking portion with which the edge of the coil spring is engaged can be provided on the base side of the convex portion.
In this case, the coil spring can be handled integrally with the support in the process of assembling the vane pump.

Further, in the third vane pump, the U-shaped bent portion serving as the convex portion can be closely contacted. In this case, since the width of the protrusion is smaller than in the case where the protrusions are spaced apart from each other, the winding diameter of the coil spring and the diameter of the hole of the vane can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described based on embodiments shown in FIGS.

1 to 3 relate to a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a vane pump, and FIG.
FIG. 3 is a front view showing a support for the coil spring, taken along line (2)-(2) of FIG. In the figure, reference numeral 1 denotes the entire vane pump.

The vane pump 1 of this embodiment has a two-part case 2, a rotor shaft 3 rotatably supported concentrically on the inner periphery of the case 2, and is fitted and fixed to the inner periphery of the case 2. The cam ring 4, the rotor 5 spline-fitted to the outer periphery of the rotor shaft 3, and the vanes 6. Which are individually accommodated in the recesses 5 a. A coil spring 7 housed in a hole 6a opened to the inner end side of the vane 6 to resiliently urge the vane 6 radially outward, and disposed on the bottom side of the recess 5a. And a support 8 for supporting the coil spring 7.

The vane pump 1 disclosed in the first embodiment
Has the same basic configuration as that of a conventionally known device, and its operation is also well known, and therefore description thereof is omitted. The vane pump 1 in the illustrated example is characterized mainly by the configuration of the support 8.

The support 8 is connected to a base 9 made of an elastically deformable band-shaped metal plate which is seated on the bottom of the concave portion 5a of the rotor 5 and one end of the base 9 is caulked at the center in the longitudinal direction. And a projection 10 formed of a pin on which the coil spring 7 is fitted. And
The band-shaped metal plate serving as the base portion 9 is bent in a substantially “H” shape when viewed from the front, so that the bending can elastically expand and contract in the radial direction. Further, the convex portion 10 made of a pin is provided with a small-diameter portion 10a as a locking portion with which the edge of the coil spring 7 is engaged at the base side. The winding diameter of the end turn portion at one end of the coil spring 7 is set small according to the diameter of the small diameter portion 10a.

As described above, since the support body 8 has a spring function, the spring force of the coil spring 7 can be reduced correspondingly. Specifically, for example, the length of the coil spring 7 to be used or the diameter of the winding diameter can be reduced for the amount of spring force by the support 8. Thereby, the depth of the hole 6a of the vane 6 can be reduced, or the diameter of the hole 6a can be reduced, and the radial dimension or circumferential width of the vane 6 can be reduced. This can contribute to downsizing of the entire vane pump 1.

FIGS. 4 and 5 relate to a second embodiment of the present invention. FIG. 4 is a front view showing a support for a coil spring.
FIG. 4 is a side view of a support. In the second embodiment, the support 8 has a one-piece structure formed by bending a single elastically deformable band-shaped metal plate.

That is, the support 8 is bent in two at the longitudinal center of the strip-shaped metal plate as a fulcrum, and the two pieces are bent approximately 90 degrees in a direction in which the two pieces are separated from each other from the middle in the longitudinal direction. The portion thus formed is a base portion 9, and the aforementioned U-shaped bent portion is a protrusion 10.
And the base part 9 is almost “to” when viewed from the front as a whole.
, And can be elastically expanded and contracted in the radial direction by this bending. The U-shaped bent portion that is the convex portion 10 is closely attached to the base portion 9.
A notch 10b as an engaging portion is provided at the base at the side.

Since the support 8 of the second embodiment has a one-piece structure made of one band-shaped metal plate, the number of parts and the number of manufacturing steps can be reduced as compared with the first embodiment. Also, if the U-shaped bent portion, which is the above-described convex portion 10, is closely contacted, the width dimension of the convex portion 10 is smaller than in the case where the convex portion 10 is separated without being closely contacted. The diameter of the coil spring 7 and the diameter of the hole 6a of the vane 6 can be reduced. This allows
Since the thickness of the vane 6 can be reduced, the material cost of the vane 6 can be reduced and the volume of the pump chamber can be increased.

It should be noted that the present invention is not limited to only the above embodiment, and various applications and modifications are conceivable.

(1) In the vane pumps of the first and second embodiments, an example in which the basic configuration is a conventionally known configuration is described. However, portions having no relation to the features of the present invention are of various types. It can be.

(2) In the first and second embodiments, the base 9 is bent as the support 8 having a spring function. However, the bent shape may be set to a waveform or other various shapes. it can.

(3) In the first and second embodiments, one support 8 is provided with one projection 10.
The number is arbitrary.

[0026]

According to the first to third aspects of the present invention, the dimension of the coil spring is reduced by providing the spring function to the support of the coil spring. Thus, the length of the coil spring to be used can be shortened, or the diameter of the winding diameter can be reduced. As a result, the depth of the hole of the vane can be reduced, or the diameter of the hole can be reduced, and the radial dimension or circumferential width of the vane can be reduced. It can contribute to miniaturization.

According to the fourth aspect of the present invention, when the coil spring is engaged with the support and integrated, the handling is simplified in the process of assembling the vane pump, the assembly efficiency is improved, and the productivity is improved. become able to.

According to the fifth aspect of the present invention, in a support formed by bending a single band-shaped plate, if a U-shaped bent portion which is a convex portion is closely contacted, it is compared with a case where the U-shaped bent portion is separated without being closely contacted. Since the width of the projection can be reduced, the diameter of the coil spring and the diameter of the hole of the vane can be reduced. As a result, the thickness of the vane can be reduced, which contributes to a reduction in the material cost of the vane and an increase in the volume of the pump chamber.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a vane pump according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line (2)-(2) of FIG.

FIG. 3 is a front view showing a support for the coil spring;

FIG. 4 is a front view showing a support for the coil spring;

FIG. 5 is a side view showing a support for the coil spring;

[Explanation of symbols]

 Reference Signs List 1 vane pump 2 case 3 rotor shaft 4 cam ring 5 rotor 5a rotor recess 6 vane 6a vane hole 7 coil spring 8 support 9 support base 10 protrusion of support

Claims (5)

[Claims] 1. A vane housed in a plurality of recesses provided on the outer periphery of a rotor so as to be able to advance and retreat in a radial direction, and a vane housed in a hole opened to the inner end side of the vane to elastically urge the vane radially outward. A coil spring, and a support disposed on the bottom side of the concave portion and supporting the coil spring, the support comprising: a base portion formed of an elastically deformable plate; and a hole formed in the base portion. And a projection provided at a position corresponding to the above, and on which a coil spring is externally fitted, and wherein the base is bent to allow elastic expansion and contraction in the radial direction. And vane pump. 2. A vane housed in a plurality of recesses provided on the outer periphery of the rotor so as to be able to advance and retreat in the radial direction, and a vane housed in a hole opened to the inner end side of the vane to urge the vane radially outward. A coil spring, and a support disposed on the bottom side of the recess and supporting the coil spring, wherein the support is a base portion formed of an elastically deformable band-shaped plate seated on the bottom of the recess. And a projection formed of a pin to which the coil spring is fitted externally at one end in the longitudinal direction of the base, and wherein the band-shaped plate as the base is elastically deformed in a radial direction. Is bent to allow for flexible expansion and contraction,
A vane pump characterized in that: 3. A vane housed in a plurality of recesses provided on the outer periphery of the rotor so as to be able to advance and retreat in a radial direction, and a vane housed in a hole opened to the inner end side of the vane to urge the vane radially outward. Pump that includes a coil spring and a support that is disposed on the bottom side of the concave portion and supports the coil spring, the support being formed by bending an elastically deformable band-shaped plate, Direction both ends are a base portion seated on the bottom of the concave portion, a middle portion in the longitudinal direction is bent into a U-shape to be a convex portion on which the coil spring is fitted, and the base portion has a diameter. The vane pump is bent so as to allow elastic expansion and contraction in directions. 4. The vane pump according to claim 1, wherein a locking portion with which an edge of a coil spring is engaged is provided on a root side of the convex portion. Vane pump. 5. The vane pump according to claim 3, wherein the U-shaped bent portion serving as the projection is closely contacted.