JPH0512553B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vane pump that sucks in fluid or gas, compresses it, and delivers it.

(Prior art) A vane pump is equipped with a rotor whose rotation center is at a point offset from the center of the cylinder, and the vane inserted into the vane groove of the rotor is pushed outward by the centrifugal force generated by the rotation of the rotor. It sucks in, compresses, and discharges fluid or gas while sliding its tip into the cylinder, and is widely used in car cooler compressors, oil pumps, power steering pumps, etc.

In the rotor of such a vane pump, it is necessary to form a vane groove into which the vane is inserted, and conventionally, the vane groove is first rough-machined on the rotor material using a milling cutter such as a metal saw, and then finished by grinding.

(Problems to be Solved by the Invention) However, since the vane grooves are deep, there are problems such as grinding burns and early wear of the grindstone during finish grinding.

Furthermore, in order to ensure the sliding clearance between the vane groove and the vane, the width of the vane groove should be set to 5μ or more.
On the other hand, the vane thickness tolerance is selected for each layer in 2μ increments, and the specified sliding clearance is obtained by selectively fitting the vane groove with the vane groove. It had poor productivity and was unsuitable for mass production.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to easily obtain an optimal sliding clearance at all times without being affected by the machining accuracy of the vane groove and the vane. We are able to provide vane pumps that are suitable for mass production.

(Means for Solving the Problems) In order to achieve the above object, the present invention has a vane groove having a tapered surface shape that gradually becomes narrower in the axial direction of the rotor, and the vane also has a shape that becomes narrower in the axial direction of the rotor. It is characterized by a tapered surface shape that gradually becomes narrower.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a perspective view of a rotor and vanes that constitute a vane pump according to the present invention.

Reference numeral 1 denotes a rotor, and the rotor 1 is composed of a shaft member 2 forming a rotating shaft, and a cylindrical metal base 3 integrally connected to the shaft member 2.

Three vane grooves 11 are formed in the base body 3 so as to open on both end faces 3a and 3b.

At least one side of the sliding surfaces 12, 12 for slidingly guiding the vane in the vane groove 11,
The shaft member 2 is formed into a tapered surface 13 slightly inclined in the longitudinal direction of the shaft member 2 so that the groove widths a and b at both end surfaces 3a and 3b satisfy a>b.

21 is a vane, and the sliding surfaces 22, 22 of the vane 21 with the vane groove 11 are the tapered surfaces 13.
Corresponding to this, one side is formed into a tapered surface 23 so that the thicknesses c and d at both end surfaces 21c and 21d satisfy c>d, and the tapered surface 23 is inserted into the vane groove 11 so as to be freely movable. A predetermined clearance is ensured between them.

Since this embodiment is constructed as described above, the rotor 1 and vane 21 with a predetermined sliding clearance can be easily manufactured, for example, by the method described below.

To explain with reference to FIG. 2, 103 is the base 3
The material 103 has a tapered surface 1.
A vane groove 11 having a diameter of 3 is formed. The vane groove 11 is formed by appropriate means such as rough cutting or finishing by grinding.

Reference numeral 121 is a material for forming the vane 21, and the material 121 has a tapered surface 2 corresponding to the vane groove 11.
3 are formed, and the material 1
The length of 21 is slightly larger than the length of the material 103 of the base body 3.

The material 121 of the vane 21 is fitted into the vane groove 11 of the material 103 and pressed into a wedge shape as shown by the arrow (A).

Next, in the pressed state, both end portions 151 and 152 are processed and removed as shown by diagonal lines, whereby both end surfaces 3a and 3b of the base body 3 are processed and both end surfaces 21c and 21d of the vane 21 are processed at the same time. .

Next, the material 1 with both end surfaces 21c and 21d processed
21 from the vane groove 11, and at least one of the sliding surfaces 22, 22 is removed by a minimum amount (t) (2 μ~
5μ) Process it uniformly and remove it to obtain the vane 21.
The process of uniformly removing a very small amount of the sliding surface 22 may be performed by an appropriate method such as a chemical method, an electrolytic method, or a machining method.

Therefore, the sliding clearance between the vane groove 11 of the rotor 1 and the vane 21 obtained by this method always removes the sliding surface 22 uniformly regardless of the tolerance of the vane groove 11 and the tolerance of the vane 21. Therefore, it is possible to eliminate the troublesome work such as conventional selective fitting work, and the vane groove 11
The finishing grinding process can be reduced, the rotor 1 and the vane 21 can be efficiently produced, and it is suitable for mass production of vane pumps.

In addition, in the embodiment, the sliding surface 1 of the vane groove 11
2 is formed with a flat surface, but if an uneven portion 41 is formed on the sliding surface 12 as shown in a partial plan view in FIG. 3, a labyrinth effect can be obtained and the frictional resistance of the vane can be reduced. be able to.

(Effect of the invention) As is clear from the above explanation, according to the present invention,
The vane groove of the rotor and the sliding surface of the vane are tapered surfaces that gradually become narrower in the axial direction of the rotor.
At the processing stage, the end face of the vane is cut off with the vane fitted in the vane groove, then the vane is removed, a very small amount of the sliding surface of the vane is uniformly removed, and the vane is fitted into the vane groove again. A vane pump is obtained. Therefore, the optimum sliding clearance can always be easily obtained without being affected by the machining accuracy of the vane groove and the vane, and is suitable for mass production of vane pumps.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a rotor and vanes constituting a vane pump according to the present invention, Fig. 2 is a side view of a vane groove and a vane portion showing a manufacturing method thereof, and Fig. 3 is a part showing a modification of the vane groove. FIG. In the drawings, 1 is a rotor, 2 is a shaft member, 3 is a base, 11 is a vane groove, 13 is a tapered surface, 21 is a vane, and 23 is a tapered surface.

Claims (1)

[Scope of Claims] 1. A vane pump including a rotor in which a vane groove is formed and a vane inserted into the vane groove, wherein the vane groove has a tapered surface shape that gradually becomes narrower in the axial direction of the rotor. A vane pump, characterized in that the vane also has a tapered surface shape that gradually becomes narrower in the axial direction of the rotor.