JPS6226392A - Manufacture of vane type air pump - Google Patents

Abstract

PURPOSE:To enable common machining on the outercircumference of the tubular section and the cover section while fitting each other by pressure contacting the convex section against the outer or inner circumference through wedge function between the inclined section preformed at the convex section of tubular section and the inclined section preformed at the concave section of cover section. CONSTITUTION:Convex section 20 is formed at the tubular section 7 of rotor 3 while concave section 22 engagable with the convex section 20 is formed in the cover section 8 where inclined sections 21, 23 are formed respectively at the convex and concave sections 20, 22. Upon securing of the tubular section 7 and the cover section 8 through a screw 24, the inclined sections 21, 23 will pressure contact to fit the outercircumference of convex section 20 with the innercircumference of concave section 22 through wedge function. Consequently, the fitted tubular section 7 and the cover section 8 can be rotated concentrically to finish the tubular face by means of a tool. The inner tubular face at the tubular section 7 and the cover section 8 can be realized where re-assembling to provide proper gap between the rotor 3 and the land section upon completion of pump, resulting in prevention of degraded pump efficiency and incomplete rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a vane-type air pump that is mainly used as a secondary air introduction device or a supercharger for a vehicle internal combustion engine.

[Prior art]

An example of a vane type air pump is shown in FIGS. 7 and 8.

In the drawing, a cylindrical chamber (2) is formed in a casing (1), and a rotor (3) is installed in this cylindrical chamber (2) with its rotation axis eccentric to the axis of the cylindrical chamber (2). ), this rotor (3) consists of a cylindrical part (7) and a lid part (8),
It is rotatably supported by the end wall of the casing (1) via a bearing. Then, a vane shaft (9) having one end fixed to the casing (1) and extending inside the rotor (3) concentrically with the cylindrical chamber (2) is inserted through a long hole (10) formed in the rotor. An extending vane (12) is rotatably supported via a bearing (17), and a pair of seals, one of which is urged by a spring member (16), is provided in the elongated hole (10) of the rotor (3). A member (11) is provided, the sealing member (11)
is in contact with the side surface of the vane (12) to obtain airtightness. The cylindrical chamber (2) has a suction chamber (14) separated from the rotor (3) by a land portion (13) with a very small gap between the rotor (3) and the rotor (3).
and a discharge chamber (15) are open, and the rotor (3) rotates and the vanes (12) rotate accordingly, thereby performing a pumping action. The manufacturing method of this vane type air pump includes forming a convex portion (20) in the cylindrical chamber (7) of the rotor (3), and also forming a convex portion (20) on the lid portion (8). An engaging recess (22) is formed,
Before assembling the pump, prepare the cylindrical part (7) and lid part (8).
The cylindrical part (7) and the lid part (8) are jointly machined in this state, and the outer circumferences of the cylindrical part (7) and the lid part (8) are jointly machined. ), the cylindrical part (7) is housed in the casing (1), and the vane (12) is separated from the cylindrical part (7).
), the lid part (8) is re-fitted into the cylindrical part (7), and fixed with screws (24). As mentioned above, the cylindrical part (7) and the lid part (8) are positioned in advance by the convex part (20) and the concave part (22), fixed with screws (24), and the outer peripheral part is co-processed at the same time. Since one end of the rotor (3) rotates while being supported by the casing (1) by the lid (8), it is necessary that the lid (8) and the cylindrical part (7) have the same cylindrical surface. It's for a reason.

(Problems to be Solved by the Invention) As mentioned above, after the cylindrical part (7) and the lid part (8) have been fitted with the projections and recesses once, the cylindrical part ( The convex part (20) of 7) and the concave part (22) of the lid part (8) must have a loose relationship with a slight gap when engaged, and in reality, the convex part of the cylindrical part (7) part (20) and lid part (8)
There is a machining error in the position and shape of the recess (22), and the cylindrical part (7) has a long hole (1) through which the vane (12) passes.
0) is formed, and the diameter of the end of the cylindrical portion (7) is likely to change.
If there is any play when the parts 2) are fitted together, the cylindrical part (7) and the lid part (8) may be co-processed and the lid part (8) attached to the cylindrical part (7) again.
When assembled, the convex part (20) shifts within the concave part (22), making it impossible to reproduce the cylindrical surface during processing. For this reason, the cylindrical portion (7) is displaced from the lid portion (8), and the cylindrical portion (7) is displaced from the land portion (
13) and cause rotation failure, or there is a large gap between the cylindrical part (7) and the land part (13), causing the discharge chamber (
15) into the suction chamber (14), resulting in a disadvantage that the pump efficiency decreases.

The present invention has been made in view of these points, and when the rotor's cylindrical portion and the lid portion are once separated and then re-fitted into the concave and convex portions, the reproducibility of the outer cylindrical surface is good, and the above-mentioned disadvantages can be avoided. The purpose of the present invention is to provide a method for manufacturing a vane type air pump that does not generate air.

[Means for solving problems]

The invention will be explained with reference to the accompanying drawings which correspond to embodiments. In the present invention, the cylindrical part (7) and the lid part (8) of the rotor (3) are fitted in a concave-convex manner, the outer peripheral part is co-processed in this state, and then the cylindrical part (7) and the lid part (8), the cylindrical part (7) is housed in the casing (1), and the vane (
12), and then the convex portion (20) of the cylindrical portion (7) is inserted, and then the convex portion (20) of the cylindrical portion (7) A sloped part (21) is formed in advance in the recessed part (22) of the lid part (8). Due to the wedge action, the convex part (
20) is brought into pressure contact with the outer periphery or inner periphery of the recess (22) to fit the cylindrical portion (7) and the lid portion (8), and in this state, the cylindrical portion (
7) and the outer periphery of the lid part (8) are co-processed.

[Effect]

Since the present invention is as described above, the convex portion (
20) and the inclined portions (21) and (23) formed in advance in the recessed portion (22) of the lid portion (8) press against each other, and due to the wedge action, the convex portion (20) of the cylindrical portion (7) becomes the recessed portion (22). It is positioned in pressure contact with the outer periphery or inner periphery, and the outer periphery is processed into the same cylindrical surface. Then, when the cylindrical part (7) and the lid part (8) are fitted together again, the inclined surfaces (21) (23)
Due to the wedge action, the convex portion (20) comes into pressure contact with the outer or inner circumference of the concave portion (22), reproducing the cylindrical surface during processing.

〔Example〕

Embodiments of the present invention will be described based on the accompanying drawings.

As shown in FIG. 1, a convex portion (20) is formed on the cylindrical portion (7) of the rotor (3), and a concave portion (22) that engages with the convex portion (20) is formed on the lid portion (8). It is formed. As shown in FIG.
1) is formed, and a sloped portion (23) is also formed in the recessed portion (22) of the lid portion (8). Cylindrical part (7) and lid part (8)
When these are fitted together, a gap d will be created since the convex part (20) and the concave part (22) are in a loose relationship, but as shown in FIG. 8) and the screw (24
), the inclined part (21) is fixed as shown in Fig. 4.
(23) are in pressure contact, and the outer periphery of the convex part (20) and the inner periphery of the recessed part (22) are in pressure contact due to the wedge action, and at this time, the inclined parts (21) and (23) are brought into pressure contact by the force of the screw (24). Therefore, the inclined portions (21) and (23) sometimes undergo plastic deformation, resulting in a state in which the convex portion (20) and the concave portion (22) are fitted. Then, as shown in FIG. 5, the cylindrical part (7) and the lid part (8) are rotated concentrically, and the cylindrical surface is finished at the same time with a biscuit (25). Then, the lid part (8) and the cylindrical part (7) are separated, the cylindrical part (7) is housed in the casing (1), and the vane is installed in the cylindrical part (7), as shown in Fig. 6. (12
). After this, the lid part (8) is fitted and fixed to the cylindrical part (7). At this time, the convex part (20) of the cylindrical part (7) and the concave part (22) of the lid part (8) are in the state shown in FIG.
Since the inclined parts (21) and (23) are engaged to obtain the same state as during processing, the cylindrical part (7) and the lid part (8) reproduce the same cylindrical surface. Therefore, as shown in FIGS. 7 and 8, when the pump is completed, the lid part (3) that positions the rotor (3) is
8) and the cylindrical part (7) have the same cylindrical surface, an appropriate clearance between the cylindrical part (7) and the land part (13) can be obtained, and this can prevent a decrease in pump efficiency or prevent the cylindrical part (7) from decreasing. Rotation failure due to contact between the land portion (13) and the land portion (13) is prevented.

〔Effect of the invention〕

Since the present invention is as described above, in a vane type air pump, even if the cylindrical part of the rotor and the lid part are fitted together in advance and the outer circumferential surface is co-processed, the same cylindrical shape as that at the time of processing is obtained. It is possible to reproduce the cylindrical surface of the part and the lid part, and when the pump is completed, it is possible to obtain an appropriate gap between the rotor and the land part, so there is no reduction in pump efficiency or poor rotation.

[Brief explanation of the drawing]

1 to 6 show embodiments of the present invention, FIG. 1 is a cross-sectional view showing the state before the cylindrical part of the rotor and the lid part are fitted together, and FIG.
The figure is a sectional view showing the fitted state of the cylindrical part and the lid, FIG. 3 is an enlarged sectional view of the main part showing the protrusion of the cylindrical part and the recess of the lid, and FIG. An enlarged cross-sectional view of the main parts showing how the convex part and the concave part of the lid are engaged, Figure 5 is a cross-sectional view showing an example of simultaneous machining of the cylindrical part and the lid, and Figure 6 is the assembly of the vane type air pump. 7 is a longitudinal sectional view showing an example of a vane type air pump, and FIG. 8 is a sectional view taken along the line AA in FIG. 7. Explanation of symbols 1...Casing 2...Cylindrical chamber 3...Rotor 7...Cylindrical part 8...Lid part 9...Vane shaft 1
0... Long hole 11... Seal member 12... Vane 20... Convex part of cylindrical part 21... Inclined part 2 of convex part
2... Recessed portion of the lid portion 23... Inclined portion 24 of the recessed portion...
・Screw patent applicant Yamada Seisaku Danshin Co., Ltd. Representative Yama 1) Karaon'kutoyu>: Figure 3 X4rj! J Figure 5 1゜Figure 6 Figure 7

Claims (1)

[Claims] The cylindrical part (7) of the rotor (3) and the lid part (8) are fitted in a convex-concave manner, and in this state, the outer peripheral part is co-processed, and then the cylindrical part (7)
and the lid part (8) are separated, the cylindrical part (7) is housed in the casing (1), the vane (12) is inserted into the cylindrical part (7), and then the cylindrical part ( In the method for manufacturing a vane air pump in which the convex portion (20) of the cylindrical portion (7) is fitted with the convex portion (20) of the cylindrical portion (7), the inclined portion (21
) in the lid portion (8), and a concave portion (22
) is also formed in advance with a sloped part (23), and the wedge action of the sloped parts (21) and (23) brings the convex part (20) into pressure contact with the outer periphery or inner periphery of the recessed part (22) to form a cylindrical part. (7) and a lid (8) are fitted together, and in this state, the outer peripheries of the cylindrical part (7) and the lid (8) are co-processed.