JPH0424155Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an improvement of the rotor of a vane pump such as an oil rotary pump.

[Conventional technology]

Figures 7 and 8 are, for example, from Jitsukō 50-30649.
1 is a cross-sectional view showing a rotor of a conventional vane pump disclosed in the publication; in the figure, 1 and 2 are drive side and non-drive side housings, respectively; 3 is a cylindrical housing having an air intake port 4 and an air discharge port 5; The casing is connected to both housings 1 and 2. A drive shaft 6 is supported by the casing 3 via bearings 7 and 8. 9 is a fitting part 9 for the drive shaft 6.
A is connected to a rotor that rotates eccentrically within the casing 2, and 10 is a blade that slides within a blade groove 9b that is opened in the radial direction of the rotor 9.

In the structure configured as described above, the rotation of the rotor 9 causes the blades 10 to rotate along the inner wall of the casing 3 in the same direction as the drive shaft 6 while pressing the inner wall of the casing 3, thereby pumping the air in the vacuum tank. Air is inhaled through the suction port 4 and discharged to the air discharge port 5. By the way, in machining the rotor 9, a fitting portion 9a into which the drive shaft 6 is fitted and a blade groove 9b are machined.
Further, a drive shaft 6 is coupled to the fitting portion 9a, and a blade 10 is arranged in the blade groove 9b.

[Problem that the invention attempts to solve]

Since the rotor of a conventional vane pump is constructed as described above, the rotor is completed by machining the fitting part and the vane grooves on a round bar, which poses the problem of increasing the weight of the rotor. Ta.

This invention was made to solve the above-mentioned problems, and the purpose is to obtain a vane pump rotor that can reduce the weight of the rotor.

[Means for solving problems]

The rotor of the vane pump according to this invention includes a pair of semi-cylindrical rotors divided into two in the radial direction, a pair of rotating shafts connected to respective ends spanning the pair of rotors, and The diameter of each bearing fitting portion of the rotating shaft is smaller than the diameter of the inner peripheral portion of the pair of rotors.

[Effect]

In the rotor of the vane pump in this invention, the cylindrical rotor is divided into two in the radial direction, a rotating shaft is connected to both ends of this semi-cylindrical rotor, and the rotating bearing fitting part is smaller than the inner diameter of the rotor. It is also made smaller in diameter.

〔Example〕

An embodiment of this invention is shown below in Figures 1 to 6.
This will be explained with a diagram. In the figure, reference numeral 20 denotes a pair of rotors formed by dividing a cylinder into two, which are configured in a semi-cylindrical shape, and have sliding grooves 20a for blades formed on opposing surfaces of both rotors. 20b is a recess formed at each end of the pair of rotors 20, and 20c is a recess 20.
Fitting portions 21 and 22 with a diameter smaller than b are this fitting portion 2.
0c, fitting portions 21b, 22b that are fitted to the bearings, and cutout portions 21c, 22c obtained by cutting out the large diameter portions 21a, 22a in the radial direction. This is the rotation axis. Note that the width of the notches 21c and 22c is configured to be larger than the width of the blade sliding groove 20a. Note that the rotating shaft 2 is connected to the fitting portion 20c of the pair of rotors 20.
The large diameter portions 21a and 22a of No. 1 and 22 are fitted together, the outer periphery of the large diameter portions 21a and 22a and the recess 20b are welded together, and then the width dimension of the sliding groove 20a is precisely machined. In addition, the inner peripheral portion 20d of the rotor 20
The diameter of the fitting portion 21 of the rotating shafts 21, 22
The outer circumferential diameters of b and 22b are configured to be small.

In the structure configured as described above, first, the recess 20b and the fitting part 20c are formed in the cylindrical member, and then the cylindrical member is divided into two parts. Thereafter, the large diameter parts 21a, 22a are fitted into the fitting part 20c, and the large diameter parts 21a, 22a and the recessed part 20b are welded together. Thereafter, the two-divided surface, that is, the sliding groove 20a, is precisely machined to a predetermined size by milling, for example, to form the sliding surface of the blade. In this case, the notches 21c and 22c of the large diameter portions 21a and 22a are configured to be larger than the width of the sliding groove 20a, and the fitting portions 21b and 22b are formed on the rotor 20.
Since the diameter is smaller than that of the inner peripheral part 20d, the fitting parts 21b, 22b and the large diameter parts 21a, 22
None of the grooves a are cut into milling cutters, and only the sliding grooves 20a are machined, which means that they can be machined easily and in a short time.

[Effect of idea]

As described above, this invention includes a pair of semi-cylindrical rotors that are divided into two in the radial direction, a pair of rotating shafts that span the pair of rotors and are connected to their respective ends, and Since the diameter of each bearing fitting part of the shaft is made smaller than the diameter of the inner peripheral part of the pair of rotors, not only can the weight of the rotor be reduced, but also the sliding grooves of the blades can be easily machined. effective.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of this invention, Fig. 2 is a side view thereof, Fig. 3 is a sectional view of the main part of Fig. 1, Fig. 4 is a plan view of the rotating shaft, and Fig. 5 is a side view thereof. FIG. 6 is a front view thereof, FIG. 6 is a side view thereof, FIG. 7 is a sectional view of the conventional device, and FIG. 8 is a sectional view taken along the - line. In the figure, 20 is a rotor, 20a is a sliding groove, 20
b is a recessed portion, 20c is a fitting portion, 20d is an inner peripheral portion, 2
1 and 22 are rotating shafts, 21a and 22a are large diameter parts, 2
1b and 22b are fitting parts, and 21c and 22c are notches. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A pair of semi-cylindrical rotors divided into two in the radial direction, a pair of rotating shafts connected to respective ends spanning the pair of rotors, and bearing fitting portions of each of the pair of rotating shafts. A rotor for a vane pump, characterized in that the diameter of the rotor is smaller than the diameter of the inner circumference of the pair of rotors.