KR20020026790A - Automotive vane-type vacuum pump - Google Patents

Abstract

PURPOSE: An automotive vane-type vacuum pump is provided to improve durability without adherence between an axial end surface of a rotor and a case. CONSTITUTION: An automotive vane-type vacuum pump comprises: a bottomed cylindrical case(30) having an inlet(1) and an outlet(2); a rotor(24) eccentrically accommodated in the case; a shaft(21) secured to the rotor, having both ends thereof rotatably supported by both bottom surfaces of the case, and rotates the rotor by an external driving force; and a vane(11) rotating slidably in contact with the inner peripheral surface of the case while moving in and out of the rotor as the rotor rotates. The axial movement of the shaft is restricted by slidable contact between axial movement restricting stepped portions(28) provided on both ends of the shaft and the case, and a very small gap is formed between an axial end surface of the rotor and the case. Therefore, the axial end surface of the rotor and case are not adhered, quality is improved, and durability is improved.

Description

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

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

Fig. 11 is a side view showing, in cross section, a portion showing, for example, a conventional vane vacuum pump for automobiles disclosed in International Publication No. WO 00/36303. 12 is a cross-sectional view taken along the line E-E in FIG. As shown in Figs. 11 and 12, a conventional vane type vacuum pump for automobiles has an inlet port 1 and an outlet port 2, and is a schematic user cylindrical housing coupled to each other by bolts ( 4) and bracket (5) form a closed space. The housing 4 and the bracket 5 are made of aluminum. The bracket 5 rotatably supports the shaft 21 by the bearing 8.

The shaft 21 is provided with a rotor 24 which is eccentrically housed in the housing 4 and can rotate in the housing 4.

The rotor 24 is made of aluminum. The vane groove 10 is radially provided in the rotor 24, and the vane 11 is disposed in the vane groove 10 so as to be sunk. The vane 11 tries to protrude radially outward from the vane groove 10 by centrifugal force as the rotor 24 rotates, and rotates together with the rotor 24 while contacting the inner circumferential surface of the housing 4 at its outer edge. . Then, the rotor 24 and the vane 11 suck the fluid at the suction port 1 by the rotation of the rotor 24 and discharge the discharge port at the discharge port 2. The coupling 13 is provided in the shaft 21, and the rotational force can be input from the vehicle side.

This vane type vacuum pump has two fin-shaped protrusions 23 extending in the shaft direction axially to the shaft portion corresponding to the axial electric field of the housing 4 of the shaft body 22 in the shaft 21. The rotor 24 is provided in a radially opposite position, and the rotor 24 is provided with two axial grooves 25 fitted in correspondence with the two fin-like protrusions 23, so that these fin-like protrusions 23 and the axial grooves are provided. The torque can be transmitted via 25.

The rotor 24 is formed and integrally attached to the shaft 21 by integral casting. For this configuration, there is no shaking between the shaft body 22 of the shaft 21 and the rotor 24. The rotor is integrally molded, for example by alumin diecast or plastic molding.

In this vane type vacuum pump for automobiles, 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 vane on the rotor 24 is rotated according to the eccentric rotation. 11) rotates while sliding on the inner circumferential surface of the housing 4 to protrude radially outward by the centrifugal force in the rotor 24, sucks the fluid in the inlet 1 and discharges and discharges it in the outlet 2.

In the vane vacuum pump for automobiles having such a configuration, the movement of the rotor 24 and the shaft 21 in the rotational axis direction is regulated by the side of the rotor 24 contacting the housing 4 and the bracket 5. . That is, when the side surface of the rotor 24, the housing 4, and the bracket 5 contacted, the movement of the rotor 24 and the shaft 21 in the rotational axis direction was regulated.

And since the rotor 24, the housing 4, and the bracket 5 were made of aluminum of the same kind of metal, there was a problem of causing heat fixation.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and thus it is possible to obtain a vane type vacuum pump for automobiles in which the axial cross section of the rotor and the case are not pressed, and the quality is improved, the reliability is improved, and the durability is improved. The purpose.

The vane type vacuum pump for automobiles of the present invention is a user cylindrical case having an inlet and an outlet, a rotor eccentrically housed in the case, fixed to the rotor, and both ends of which are freely supported on both bottom faces of the case, In the pump that rotates the rotor by the driving force of the rotor and the vane that rotates in contact with the inner circumferential surface of the case while entering and exiting the rotor, and pumps the fluid from the inlet to the outlet, Movement is regulated because the case is in contact with the axial movement regulating end portions provided at both ends of the shaft, and a delicate gap is formed between the axial end surface of the rotor and the case.

The shaft and case are made of dissimilar metal.

Moreover, the oil sump is provided in the axial end surface of a rotor.

In addition, the oil sump is simultaneously formed when the rotor is integrally molded and manufactured.

In addition, the rotor is integrally cast with the shaft by insert molding, and the shaft is provided with an escape preventing groove formed in the circumferential direction.

In addition, an oil groove is formed in the bearing portion of the shaft.

Further, the drive transmission means is provided outside the bearing portion of the shaft, and the bearing portion has a length such that the drive means does not contact the case even if heat and expansion occurs.

Moreover, the part corresponding to the vane groove of the axial regulation flange part provided in the shaft is cut out smaller than the innermost diameter of the vane groove with respect to the radial direction, and larger than the groove width of the groove of a vane in the circumferential direction.

BRIEF DESCRIPTION OF THE DRAWINGS The side view which makes a cross section the part which shows embodiment of the vane type vacuum pump for automobiles of this invention.

FIG. 2 is a front view in which a part of the rotor and the shaft by the city A of FIG. 1 is made into a cross section. FIG.

3 is a cross-sectional view in the direction of the arrow along line B-B in FIG.

4 is a rear view of a rotor and a shaft showing another embodiment of the vane type vacuum pump for automobiles of the present invention.

FIG. 5 is a side view of the rotor in cross section along line C-C in FIG. 4; FIG.

6 is a front view of the rotor and the shaft;

Fig. 7 is a rear view of the rotor and shaft showing another embodiment of the vane type vacuum pump for automobiles of the present invention.

FIG. 8 is a side view of the rotor taken along the line D-D in FIG. 7; FIG.

9 is a front view of the rotor and the shaft;

It is a side view which makes a cross section a part of main part which shows another embodiment of the vane type vacuum pump for automobiles of this invention.

Fig. 11 is a side view showing a portion of a conventional vane type vacuum pump for a vehicle in section;

12 is a cross-sectional view taken along the line E-E of FIG.

<Description of the symbols for the main parts of the drawings>

1: Inlet port 2: Outlet port

4 housing 5 bracket

10: vane groove 11: vane

21: shaft 21b: oil groove

24: rotor 24a: oil sump

24c: Breakaway prevention groove 28: End part (axial movement control end)

29: flange part (axial movement control end)

29a: notch 30: case (housing bracket)

Embodiment 1

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which makes a cross section a part which shows embodiment of the vane type vacuum pump for automobiles of this invention. 2 is a front view which makes a cross section the part of the rotor and the shaft which were seen from the A side of FIG. 3 is sectional drawing seen from the arrow along the B-B line | wire of FIG.

The vane type vacuum pump for automobiles of the present embodiment owns the inlet port 1 and the outlet port 2 and is a schematic user cylindrical housing 4 and an opening side of the housing 4 which are joined by bolts 3 to each other. Has a bracket (5) to cover the lid. The housing 4 and the bracket 5 form a sealed space as a case 30 having bottom faces at both ends of the cylinder. The housing 4 and the bracket 5 are made of aluminum. The shaft 21 is disposed through the case 30, and both ends thereof are freely supported on both bottom faces of the case 30. The shaft 21 is made of carbon steel or alloy steel.

An oil supply port 27 is provided on the side surface of the housing 4. Lubricant oil is supplied from the oil supply port 27. The oil supply port 27 communicates with the inner end surface of the housing 4 via the shaft end of the shaft 21.

At the end of the oil feed port 27 of the shaft 21, an end 28 as an axial movement restriction end is formed. On the other hand, the flange part 29 as an axial movement control end part is formed in the edge part on the opposite side to the shaft 21 similarly. The end portion 28 is in contact with the inner surface of the housing 4 to restrict movement in the left direction in FIG. 1. Similarly, the flange portion 29 is in contact with the inner surface of the bracket 5 to restrict movement in the right direction of FIG. 1. The oil groove 21b is spirally wound in the bearing portion 21a, which is a portion outside the flange portion 29 of the shaft 21, the portion of which is freely supported by the bracket 5.

The shaft 21 is fixed with a rotor 24 which is eccentrically housed in the housing 4 and can rotate in the housing 4.

The rotor 24 is made of aluminum. A small gap is formed between the axial cross section of the rotor and the inner surface of the housing 4. In addition, a minute gap is formed between the axial end surface of the rotor 24 and the inner surface of the bracket 5. That is, the both axial end surfaces of the rotor 24 are not in contact with the housing 4 and the bracket 5 constituting the case 30. The rotor 24 is radially provided with the vane groove 10, and the vane 11 is arranged in the vane groove 10 so that the vane 11 can be projected.

The vane 11 rotates together with the rotor 24 while contacting the inner circumferential surface of the housing 4 at its outer circumference so as to project radially outward from the vane groove 10 by centrifugal force as the rotor 24 rotates.

Then, the rotor 24 and the vane 11 suck the fluid at the suction port 1 by the rotation of the rotor 24 and discharge the discharge port at the discharge port 2. The shaft 21 is provided with a coupling 13 as a drive transmission means so that the rotational force can be input from the vehicle side. As the drive transmission means, a gear sprocket, a pulley, etc. may be used in addition to the coupling 13.

The rotor 24 is formed and integrally attached to the shaft 21 by integral casting. Because of this configuration, there is no shaking between the shaft body 22 of the shaft 21 and the rotor 24. The rotor 24 is integrally molded by, for example, casting forging, aluminum die casting or plastic molding.

As shown in FIG. 2 and FIG. 3, the oil sump 24a is provided also in the axial end surface of the rotor 24. As shown in FIG. Moreover, the oil receiving 24a is provided also in the cross section of the back of the rotor 24. The sump 24a is formed simultaneously when the rotor 24 is integrally molded as described above.

In such a vane vacuum pump for automobiles, when a rotational force is transmitted from the coupling 13 to the shaft 21, the rotor 24 is rotated at an eccentric position in the housing 4, and the rotor 24 is rotated according to the eccentric rotation. The vane 11 on the top rotates while sliding on the inner circumferential surface of the housing 4 so as to protrude radially outward by the centrifugal force from the rotor 24, suctions the fluid from the inlet 1, and discharges and discharges it from the outlet 2. .

Lubricant oil is supplied from the oil supply port 27 to lubricate the shaft end of the shaft 21, and then reach the inner surface of the housing 4 and accumulate in the drip tray 24a, so that the rotor 24, the housing 4, Lubricate between. The lubricating oil then reaches the opposite side through the hollow in the rotor 24 and collects on the opposite sump 24a to lubricate between the rotor 24 and the bracket 5. The lubricating oil then accumulates in the oil groove 21b formed in the bearing portion 21a and lubricates the shaft 21 with the bracket 5.

The vane type vacuum pump for an automobile having such a configuration includes a user cylindrical case 30 having an inlet 1 and an outlet 2, a rotor 24 eccentrically housed in the case 30, and a rotor 24. It is fixed, and both ends are supported on both bottom surfaces of the case 30 freely, the shaft 21 for rotating the rotor 24 by the driving force from the outside, and the rotor 24 in accordance with the rotation of the rotor 24 The vane 11 rotates in contact with the inner circumferential surface of the case 30 while entering and exiting, and the movement of the shaft 21 in the rotational axial direction is carried out at the axial movement control end portions (end portions 28 and flange portions 29) provided at both ends of the shaft. It is regulated by contacting 30 and a small gap is formed between the axial end surface of the rotor 24 and the case 30. For this reason, the axial end surface of the rotor 24 and the case 30 do not stick together, quality improves, reliability improves, and durability improves.

The shaft 21 is made of carbon steel or alloy steel, the case 30 is made of aluminum, and both are made of dissimilar metals. For this reason, the axial end surface of the rotor 24 and the case 30 are not pressed again, and quality improves and durability improves.

Moreover, the oil sump 24a is provided in the axial end surface of the rotor 24. As shown in FIG. As a result, the axial end face of the rotor and the case are not pressed again, the quality is improved, the durability is improved, and the friction is less, and the rotational load can be reduced.

In addition, the sump 24a is formed at the same time when the rotor 24 is manufactured by integral molding. This makes it easy to form and cost down.

An oil groove is formed in the bearing portion of the shaft.

This prevents abrasion of the shaft, improves durability, reduces friction, and reduces rotational load.

Embodiment 2

Fig. 4 is a rear view of the rotor and the shaft showing another embodiment of the vehicle vane vacuum pump of the present invention. FIG. 5 is a side view of the rotor taken along the line C-C in FIG. 4. FIG. 6 is a front view of the rotor and the shaft.

In the present embodiment, the rotor 24 is integrally cast with the shaft 21 by insert molding as in the first embodiment, but the departure prevention groove 24c formed over the whole pole is formed in the shaft 21 to prevent separation. ) Is installed. For this reason, the shaft 21 can be reliably prevented from leaving the rotor 24 and reliability is improved.

In addition, the departure preventing groove 24c does not necessarily need to be formed over the entire circumference, and has an effect even if intermittent in the circumferential direction.

Embodiment 3

Fig. 7 is a rear view of a rotor and a shaft showing another embodiment of the vane type vacuum pump for automobiles of the present invention. FIG. 8 is a side view of the rotor taken along the line D-D of FIG. 7. 9 is a front view of the rotor and the shaft.

In the present embodiment, as in the first embodiment, the axially regulating flange portion 29 is formed on the shaft 21 to restrict the movement of the shaft 21 in the left direction in FIG. 8. In this embodiment, the portion corresponding to the vane groove 10 of the axial regulating flange portion 29 is smaller than the innermost diameter of the vane groove 10 in the radial direction, and the vane groove 10 in the main direction. The notch 29a larger than the groove width of () is provided.

In general, in the formation of the vane groove, after integrally casting with the shaft 21 by insert molding, it is polished by machining, but in this embodiment, the notch 29a is provided, so that the knife for cutting It is easy to insert in a direction, and it is easy to pull out in an axial direction. For this reason, the process of the vane groove 10 becomes easy and it can also cost-down.

Embodiment 4

It is a side view which makes a cross section a part of main part which shows another embodiment of the vane type vacuum pump for automobiles of this invention.

In this embodiment, the gear 31 as a drive transmission means is fixed to the outer side of the bearing part 21a of the shaft 21 by heat processing. The bearing portion 21a is of a length such that the gear 31 does not come into contact with the bracket 5 even when expansion and contraction by heat occurs.

That is, the axial length Y of the bearing portion 21a is a length not relatively smaller than the thickness X of the bracket 5 due to the difference in the thermal expansion coefficient between the bracket 5 and the shaft 21. For this reason, the bearing part 21a is sandwiched between the shaft main body 22 and the gear 31, and rotation is not restricted but reliability improves.

The vane vacuum pump for automobiles of the present invention is fixed to the inlet and outlet of the user cylindrical case, the rotor and the rotor accommodated eccentrically in the case, so that both ends are freely supported on both sides of the case and are driven by the driving force from the outside. The shaft which rotates the rotor and the vane which rotates in and out of the rotor in contact with the inner circumferential surface of the case as the rotor rotates and pumps the fluid from the inlet to the outlet are moved in both ends of the shaft. It is regulated by the axial movement regulating end portion provided in contact with the case, and a minute gap is formed between the axial end surface of the rotor and the case. As a result, the axial cross section of the rotor and the case do not stick together, thereby improving quality, increasing reliability, and improving durability.

The shaft and case are made of dissimilar metal. As a result, the axial cross section of the rotor and the case are not pressed again, and the quality is improved and the durability is improved.

Moreover, the oil sump is provided in the axial end surface of a rotor.

Therefore, the axial end face of the rotor and the case are not pressed again, the quality is improved, the durability is improved, the friction is reduced, and the rotational load can be reduced.

Claims (3)

A user cylindrical case having an inlet and an outlet, a rotor eccentrically housed in the case, fixed to the rotor, and both ends of which are freely supported on both bottom faces of the case, and driven by a driving force from the outside. In a pump for rotating a rotor and a vane that rotates in contact with the inner circumferential surface of the case while entering and exiting the rotor, and pumps fluid from the inlet to the outlet, in the rotation axis direction of the shaft The vane vacuum pump for automobiles is characterized by the fact that the movement of the shaft is regulated by contact with the axial movement regulating end portions provided at both ends of the shaft, and a small gap is formed between the axial end surface of the rotor and the case. . The vane type vacuum pump of claim 1, wherein the shaft and the case are made of dissimilar metal. The vane type vacuum pump for automobile according to claim 1 or 2, wherein an oil sump is provided at an axial end surface of the rotor.