KR20010040678A - Vehicular vane-type vacuum pump - Google Patents

Abstract

The present invention provides a vane-type vacuum pump for automobiles which can be reduced in weight and does not cause abnormal wear between shafts, and has a low processing cost, a rotor housed eccentrically in the housing, and a rotor Rotationally driven shafts and rotors have vanes that rotate in contact with the inner circumferential surface of the housing, and have a protrusion or groove on the outer periphery of the shaft in a pump that pumps fluid from the inlet to the outlet, and inserts the shaft and rotor into insert molding. A vane type vacuum pump for automobiles, which is integrally secured by a lamp or the like.

The rotor is formed by aluminum die casting, plastic molding, and metal firing. The projections or grooves on the outer periphery of the shaft are made integrally at the time of manufacture by firing the shaft at the cold end of the shaft, or the sheet metal molded parts are formed by welding to the outer periphery of the shaft. The housing and rotor can also be formed of the same type of material.

Description

Automotive vane type vacuum pump {VEHICULAR VANE-TYPE VACUUM PUMP}

9 is a side cross-sectional view showing an example of a conventional automotive vane vacuum pump, and FIG. 10 is a sectional view showing spline coupling between the rotor and the shaft of the conventional automotive vane vacuum pump shown in FIG. As shown in Figs. 9 and 10, a conventional vane-type vacuum pump for automobiles has an inlet (1) and an outlet (2), and the ordinary housing (4) and the outlet ( 2), and the sealed space is formed by the ordinary housing 4 and the bracket 5 which are mutually joined by the bolt 3, respectively. The bracket (5) rotatably supports the shaft (7) by a bearing (8), the shaft (7) being rotatable in the housing (4) housed in an eccentrically housed housing (4). Is installed. The rotor 9 is disposed in the radial vane groove 10 as shown in FIG. 10 and protrudes radially outward from the vane groove 10 by centrifugal force in accordance with the rotation of the rotor 9. The vane 11 which rotates with the rotor 9 while sliding in contact with the outer periphery of the inner periphery is installed, and the fluid is sucked in the inlet port 1 by the rotation of the rotor 9 and is discharged from the outlet port 2. Discharge discharge.

The cuff ring 13 is provided in the shaft 7 so that rotational force can be input from the vehicle side. The shaft 7 is also provided with a spline 14 so as to mesh with the spline 15 of the rotor 9 so as to transmit torque. In such a vane type vacuum pump for automobiles, when a rotational force is transmitted from the cuff ring 13 to the shaft 7, the rotor 9 eccentrically rotates in the housing 4, and the eccentric rotation causes the rotor 9 to rotate on the rotor 9. The vanes 11 rotate while sliding on the inner circumferential surface of the housing 4 by trying to protrude radially outward from the rotor 9 by centrifugal force, suck the fluid from the suction port 1, and discharge the discharge port at the discharge port 2. .

In such vane type vacuum pumps for automobiles, the sprockets 14 and 15 are fitted between the shaft 7 and the rotor 9 by splines 14 and 15, but the splines 14 and 15 are High processing cost and high product price. Moreover, although the spline coupling part by the splines 14 and 15 is lubricated with oil, abnormal wear may occur because of oil property. Spline joins are loose joins, so precision is hard to come by. In addition, since the spline coupling requires strength against the torque of the spline, it is necessary to use a material having high strength, conventionally, iron-based sintered products are used as the rotor 9, and steel is used for the shaft 7. Since it existed, the weight reduction of the product was impossible. In addition, since the rotor 9 and the housing 4 use materials having different thermal expansion rates, the gap between the rotor and the housing had to be large in order to absorb the difference in thermal expansion.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and its object is to provide a vane type vacuum pump for automobiles which can reduce the weight and prevent abnormal abrasion between shafts and lower the processing cost.

[Initiation of invention]

In order to achieve the above object, in the present invention, a cylindrical housing having an inlet and an outlet, a rotor eccentrically housed in the housing, a shaft for rotating the rotor, and an inner circumferential surface of the housing according to the rotation of the rotor A vane vacuum pump for automobiles, which has a vane that rotates in contact with the vane and installs projections or grooves on the outer periphery of the shaft in a pump for feeding the rapeseed from the inlet to the outlet. Is in.

The shaft may be integrally molded by insert molding at the time of casting of the rotor, the rotor may be molded by aluminum die casting, the rotor may be integrally molded by plastic molding, and the rotor may be molded by aluminum powder and then fired. It may also be formed.

The protrusions or grooves on the outer periphery of the shaft may be formed integrally at the time of cold end of the shaft, and the protrusions or grooves on the outer periphery of the shaft may be integrally formed at the time of manufacture by firing the shaft. .

The projection of the shaft may be formed by welding an iron sheet metal molded product to the outer circumference of the shaft by welding, or the housing and the rotor may be formed of the same material.

The present invention relates to an improvement of a vane type vacuum pump for automobiles.

1 is a side cross-sectional view showing an embodiment of a vane vacuum pump for automobiles of the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a side view showing a second embodiment of a shaft of the vane type vacuum pump for automobiles of the present invention.

4 is a cross-sectional view taken along the line B-B in FIG.

Fig. 5 is a side view showing a third embodiment of the shaft of the vane type vacuum pump for automobiles of the present invention.

6 is a cross-sectional view taken along the line C-C in FIG.

The side view which shows 4th embodiment of the shaft of the vane type vacuum pump for automobiles of this invention.

8 is a cross-sectional view taken along the line D-D of FIG. 7.

Figure 9 is a side cross-sectional view of a vane vacuum pump for a conventional vehicle.

10 is a cross-sectional view showing a spline coupling between a rotor and a shaft of a conventional vane vacuum pump for a vehicle shown in FIG. 9;

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION In order to demonstrate this invention further in detail, embodiment of this invention is described according to attached drawing. In the following description, the same components as in the prior art will be denoted by the same reference numerals and description thereof will be omitted.

1 is a side cross-sectional view showing an embodiment of a vane vacuum pump for automobiles of the present invention, and FIG.

The vane type vacuum pump for automobiles of the present invention has the same overall structure as the vane type vacuum pump for automobiles shown in Figs. 9 and 10, and has an inlet port 1 and an outlet port 2, and is connected to the bolt 3 with each other. A billowing space is formed by the cylindrical housing 4 and the bracket 5 which are joined together. The bracket 5 rotatably supports the shaft 21 by the bearing 8, and the shaft 21 is housed eccentrically in the housing 4 and is rotatable in the housing 4. Is installed. The rotor 24 is disposed in the vane groove 10 provided radially, and tries to protrude radially outward from the vane groove 10 by centrifugal force in accordance with the rotation of the rotor 24, so that the outer circumference of the inner peripheral surface of the housing 4 The vane 11 which rotates with the rotor 24 while contacting with the rotor 24 is provided, and the fluid is sucked from the inlet port 1 by the rotation of the rotor 24 and drawn out from the outlet port 2. The coupling 13 is provided in the shaft 21, and the rotational force can be input from the vehicle side.

According to the present invention, the shaft 21 has a shaft portion corresponding to the axial length of the housing 4 of the shaft body 22 instead of the splines 14 and 15 as shown in FIGS. 9 and 10. The two fins 23 extending in the axial direction and protruding in the radial direction are provided at radially opposite positions, and the rotor 24 is fitted with two fins corresponding to the two fins 23. The dog axial direction 25 is provided and the torque can be transmitted through the protrusion 23 and the axial groove 25 on the fins. One or more of these fin-shaped protrusions 23 may be sufficient as long as sufficient torque transmission and ease of manufacture are sufficient, and an axial length may also be arbitrary.

The fin-shaped protrusions 23 shown in Figs. 1 and 2 can be made integrally with the shaft body 22 at the time of cold forging of the shaft 21, and are formed at the time of sintering when the shaft 21 is a sintered material. Alternatively, it may be formed by welding an iron-based sheet metal molded part to the round bar shaft body 22 by welding. For example, the sheet metal molded article may be formed by forming one end portion with a flat portion and the other end portion with a curved portion bent along the surface of the shaft body 22.

The rotor 24 is formed and integrally attached to this shaft 21 by integral casting or by integral molding. Because of this configuration, the gap between the spline couplings used in the past is eliminated, and there is no play between the shaft body 22 and the rotor 24 of the shaft 21. The shaft may be integrally cast by insert molding during rotor casting.

The rotor may be integrally formed by alumina casting or plastic molding, or may be predetermined after forming with aluminum powder. In such a vane vacuum pump for a vehicle, when a rotational force is transmitted from the coupling 13 to the shaft 21, the rotor 24 rotates at an eccentric position in the housing 4 and the vanes on the rotor 24 are subjected to the eccentric rotation. 11) rotates while sliding on the inner circumferential surface of the housing 4 in an attempt to protrude radially outward from the rotor 24 by centrifugal force, sucks fluid from the inlet port 1, and discharges and discharges it from the outlet port 2.

According to the vane type vacuum pump for automobiles of this invention, it becomes easy to ensure the torque transmission area of the fin-shaped protrusion 23 provided on the shaft main body 22 by sufficient magnitude | size, and large torque transmission is also possible. For this reason, aluminum alloys and plastics of low strength, which are not conventionally used as the rotor material, can be used as the rotor material and the weight of the product can be reduced. In addition, when the housing 4 and the rotor 24 are made of the same kind of material, a thermal expansion difference does not occur.

In addition, since the spline is not used, the processing cost can be reduced, there is no grind due to the gap between the line bonds, and no abnormal wear occurs.

FIG. 3 shows a second embodiment of another shaft 26 usable for the vane vacuum pump for automobiles of the present invention, and FIG. 4 shows a cross section along line B-B in FIG. This shaft 26 is different from the shaft 21 shown in Figs. 1 and 2 in that the number of the dorsal protrusions 23 is three, but the others have the same structure. The shaft 26 can be integrally formed with the shaft body 22 and the fin-like protrusions 23 by cold quenching or sintering.

FIG. 5 is a side view showing a third embodiment of the shaft of the vane vacuum pump for automobiles of the present invention, and FIG. 6 is a cross-sectional view taken along the line C-C in FIG. The shaft 28 is formed by two sheet metal moldings 31 extending radially outward from the round shaft body 29, and the semi-cylindrical portion 32 of the sheet metal molding 31 is welded to the shaft body 29. From both ends of the semi-cylindrical portion 32 joined by (27), two pin portions 32 extending in the opposite directions in the radial direction of the shaft main body 29 overlap and extend. The number of pin-shaped protrusions 30 is arbitrary.

Claims (3)

A normal housing having an inlet and an outlet, a rotor eccentrically housed in the housing, a shaft for rotating the rotor, and vanes that rotate in contact with the inner circumferential surface of the housing in accordance with the rotation of the rotor. A vane vacuum pump for automobiles, wherein a pump for pumping fluid from the bell outlet to the bell outlet is provided with protrusions or grooves on the outer periphery of the shaft and the shaft and the rotor are integrally fixed. An automotive vane vacuum pump according to claim 1, wherein the shaft is integrally cast by insert molding when the rotor is cast. Pottery or groove of the outer periphery of the shaft, the vane vacuum pump for automobiles according to any one of claims 1 to 2, characterized in that formed integrally at the time of cooling of the shaft.