JPH1047273A - Vane vacuum pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply required lubricating oil to a side clearance between a set of a rotor and a vane and the inside surface of a housing in a vane vacuum pump. SOLUTION: The tip of a wane 40 inserted in a vane groove 39 of a rotor 37 is opposite to the cam face 36a of a housing 26, and a first hollow chamber 63 and a second hollow chamber 64 are formed among substantially annular first recessed part 51 and a second recessed part 52 of both sides of the rotor 37 and the housing inside surface 55, 56. The first hollow chamber 63 and the second hollow chamber 64 are communicated with each other by a communicating hole 53, and the first hollow chamber 63 is communicated with a lubricating oil supply port 33. Projecting parts 59 are formed on the bases of the first recessed part 51 and the second recessed part 52, and when the projecting parts 59 are rotated with the rotor 37, lubricating oil sucked in the first hollow chamber 63 and the second hollow chamber 64 receives energy from the projecting parts 59 to flow out from the outer peripheries of the first hollow chamber 63 and the second hollow chamber 64.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vane type vacuum pump used as a negative pressure source for a brake booster of a vehicle equipped with a diesel engine.

[0002]

2. Description of the Related Art FIGS. 3 (a) and 3 (b) show a conventional vane type vacuum pump used as a negative pressure source for a brake booster of a vehicle equipped with a diesel engine.
No. 53694). Hole 2 in housing 1
The rotor 3 is rotatably supported by a shaft 19 at an eccentric position in the inside, and the rotation of the shaft 19 causes the rotor 3 to rotate. The rotor 3 is formed with four vane grooves directed toward the center. The vane 4 is slidably inserted into the vane groove. When the rotor 3 rotates, the vane 4 is rotated by centrifugal force. The tip rotates while being pressed against the cam surface 2 a of the hole 2. A large suction groove 5 and a small discharge groove 6 are formed on the cam surface 2a of the hole 2. The suction groove 5 is connected to a vacuum tank (not shown) via a suction port 7 and a check valve 7 '. Is connected to a discharge conduit via a discharge port 8.

[0003] On both sides of the rotor 3, a flat surface 1 near the outer periphery is provided.
0 and 11 and recesses 12 and 13 in the center direction are formed, and a predetermined side gap is maintained between the planes 10 and 11 and the side plate surfaces 20 and 21 of the housing 1. Concave parts 12, 13 and side plate surface
Hollow chambers 14 and 15 are formed between the hollow chambers 20 and 21. When the rotor 3 rotates, the pressure in the hollow chambers 14 and 15 is substantially half of the negative pressure generated by the vane vacuum pump. Is set. A through hole 9 is formed in the rotor 3 to reduce the weight, and the through hole 9 communicates between the hollow chamber 14 and the hollow chamber 15. The communication hole 16 ′ of the side plate 16 is connected to an oil pan (not shown) via a suction pipe 17, and the oil (lubricating oil) sucked into the hollow chambers 14 and 15 by the negative pressure due to the rotation of the rotor 3 is supplied to the housing. 1 through the radial groove 18 formed in the side wall of the side wall (the planes 10 and 11).
Between the side plate surfaces 20 and 21), the side surface of the vane 4 and the side plate surface 20,
21 and between the tip of the vane 4 and the cam surface of the hole 2.

[0004]

In the conventional vane-type vacuum pump, since the concave portions on both side surfaces of the rotor are smooth, even if the radial grooves are formed, the lubricating oil has a narrow side gap and the side surfaces of the vane and the housing side. Is not supplied sufficiently to the narrow gap between them. SUMMARY OF THE INVENTION It is an object of the present invention to provide a vane-type vacuum pump in which sufficient lubricating oil is supplied to a gap between a rotor and an inner surface of a housing and a gap between a vane side and an inner surface of a housing. And

[0005]

According to the present invention, the tip of a vane (40) inserted into a vane groove (39) of a rotor (37) is opposed to a cam surface (36a) of a housing (26), and the rotor ( A substantially annular first concave portion (51) / second concave portion (52) is formed on both side surfaces of the 37), and the first concave portion (51) / second concave portion (52) and the inner surface of the housing (55, 56).
A first hollow chamber (63) and a second hollow chamber (64) are respectively formed between the first hollow chamber (63) and the second hollow chamber (64) by a communication hole (53) formed in the rotor (37). (64), and the first hollow chamber (63) is connected to the lubricating oil supply port (33). In the vane vacuum pump, the first concave portion (51) perpendicular to the rotation axis of the rotor (37) and A plurality of straight or curved protrusions (59) extending from the vicinity of the inner periphery of the bottom surface to the outer periphery are formed on the bottom surface of the second concave portion (52), and when the protrusions (59) rotate with the rotor (37). The lubricating oil sucked into the first hollow chamber (63) and the second hollow chamber (64) receives energy from the projection (59), and the lubricating oil that has received the energy is supplied to the first hollow chamber (63) and the second hollow chamber (64). The flow out of the outer periphery of the hollow chamber (64) is referred to as a first configuration. The present invention provides, in a first configuration, a housing
A central hole (32) is formed in the protruding support portion (28) of the
The tip (34) of the shaft (31) connected to (37) has a central hole (3
2), the lubricating oil supply port is provided in the opening of the central hole (32).
(33) is formed, the first hollow chamber (63) communicates with the lubricating oil supply port (33) through the oil passage (57), and the first hollow chamber (63) is formed.
The lubricating oil flowing out of the outer periphery of the second hollow chamber (64) is supplied to the side surface between the seal portions (47, 48) on the outer peripheral portions on both side surfaces of the rotor (37) and the inner surface (55, 56) of the housing. The second configuration is that the air is supplied to the gap and the gap between both side surfaces of the vane (40) and the inner surface of the housing (55, 56).

[0006]

1A and 1B show a first embodiment of a vane type vacuum pump according to the present invention. A first protruding support portion 27 of a first housing 25 of the vane-type vacuum pump is fitted into a mounting hole 24 of a casing 23 such as a dynamo, and the vane-type vacuum pump is supported by the casing 23. The outer peripheral portion of the right side surface of the first housing 25
The left side surface of the housing 26 is abutted, and the abutting surface is sealed by a seal.
25 and the second housing 26 are connected. A bearing is provided on the inner circumferential surface of the first projecting support portion 27 of the first housing 25.
30 is mounted, and the retaining ring prevents the bearing 30 from coming off. Shaft from the left side of the first protruding support portion 27
31 is inserted, and the large-diameter support of the shaft 31 is a bearing
The inner ring 30 is fitted, and the retaining ring prevents the shaft 31 from slipping out. A gear 29 is formed at the left end of the shaft 31, and a rotational force is transmitted to the shaft 31 via the gear 29.

The large-diameter support portion and the small-diameter tip portion of the shaft 31
34, there is a spline shaft 38, and the spline shaft 38
Is engaged with a spline boss at the center of the rotor 37.
A second projecting support portion 28 is formed on the right side of the second housing 26, a center hole 32 is formed at the center of the second projecting support portion 28, and a lubricating oil supply port 33 is formed at the opening of the center hole 32. ing. The center line of the center hole 32 is on the same line as the center line of the bearing 30, and the tip end portion 34 of the shaft 31 is rotatably supported in the center hole 32. The first housing 25 and the second housing 26 form a hole 36 having a circular cross section.
The rotor 37 is rotatably supported by the shaft 31 at an eccentric position in the inside, and the rotation of the shaft 31 causes the rotor 37 to rotate.
The rotor 37 has three vane grooves 39 directed toward the center. The vane 40 is slidably inserted in the vane groove 39. When the rotor 37 rotates, the vane 40 is acted on by centrifugal force. Rotates while being pressed against the cam surface 36a of the hole 36.

A suction groove and a discharge groove are formed on the cam surface 36a of the hole 36. The suction groove communicates with the suction port 42 via a suction valve (check valve) 44, and the discharge groove connects the discharge passage 45 to the discharge passage 45. First through
It communicates with a discharge port 43 formed in the housing 25 and the casing 23. The suction port 42 is connected to a vacuum tank or the like, and the discharge port 43 is opened inside the casing 23. Rotor
The first and second seal portions 47 and 48 in the vicinity of the outer periphery and the substantially annular first portion following the taper portion 50 in the center direction are provided on both side surfaces of the 37.
A concave portion 51 and a second concave portion 52 are formed. First seal part 47
A predetermined side gap is maintained between the second seal portion 48 and the first housing inner side surface 55 and the second housing inner side surface 56.

A first hollow space is formed between the first concave portion 51 and the second concave portion 52 and the inner surface 55 of the first housing and the inner surface 56 of the second housing.
63 and a second hollow chamber 64 are formed, and the first hollow chamber 63 and the lubricating oil suction port 33 are communicated by an oil passage 57. The rotor 37 is formed with three communication holes 53 penetrating in the axial direction. The communication holes 53 allow the first hollow chamber 63 and the second hollow chamber 64 to be formed.
And are communicated. The space between the mounting hole 24 of the casing 23 and the protruding portion 27 of the first housing 25 is sealed by a seal, and is a portion surrounding the discharge passage 45 and the discharge port 43. The first housing 25 and the second housing 26 And between the first housing 25 and the casing 23 are sealed.

A plurality of curved projections (wings) 59 extending from the vicinity of the inner periphery toward the outer periphery are formed on the bottom surfaces of the first and second substantially concave portions 51 and 52. The thickness of the projection is substantially constant, has a curved surface similar to the blade of the centrifugal pump, and when the projection 59 rotates together with the rotor 37 in the direction shown in FIG. Upon receipt, the lubricating oil flows out of the outer periphery of the first hollow chamber 63 and the second hollow chamber 64. When the rotor 37 and the projection 59 are rotating, the pressure in the first hollow chamber 63 and the second hollow chamber 64 is set to be approximately half of the negative pressure generated by the vane vacuum pump. The lubricating oil supply port 33 is connected to an oil pan or an oil tank (not shown), and the lubricating oil is sucked into the first hollow chamber 63 by the negative pressure generated by the rotation of the rotor 37. It also flows into the second hollow chamber 64 through the communication passage 53. The lubricating oil in the first hollow chamber 63 and the second hollow chamber 64 is
It moves along the curved protrusion 59 and flows out of the outer periphery of the first hollow chamber 63 and the second hollow chamber 64.

The lubricating oil flowing out of the outer periphery of the first hollow chamber 63 and the second hollow chamber 64 is supplied to the first seal portion 47 and the second
The clearance between the seal portion 48 and the first housing inner surface 55 and the second housing inner surface 56 and the clearance between the both side surfaces of the vane 40 and the first housing inner surface 55 and the second housing inner surface 56 Supplied respectively. Further, the air is supplied to the gap between the tip end face of the vane 40 and the cam face 36a of the hole 36 through the gap. The lubricating oil supplied to these gaps forms an oil film necessary for sliding, and the rotor 37 and vane 40
And the first housing inner surface 55, the second housing inner surface 56,
Friction and wear with the cam surface 36a are reduced, and seizure is prevented. The rotation of the rotor 37 causes the fluid to be sucked from the suction port 42, and the exhaust gas slightly mixed with the lubricating oil is discharged from the discharge port 43 into the casing 23. Further, it is preferable that the oil passage 57 is opened at a position facing the first recess 51 within a rotation angle range between the suction port 42 and the minimum radial gap.

FIGS. 2A and 2B show a second embodiment of the vane type vacuum pump according to the present invention. In the description of FIGS. 2A and 2B, the same members as those in FIGS.
The same reference numerals as in (b) are attached and the description is omitted. The second embodiment is different from the first embodiment in that a substantially annular first
Only the shapes of the protrusions 59 formed on the bottom surfaces of the concave portions 51 and the second concave portions 52 and the shapes of some of the first concave portions 51 and the second concave portions 52 are shown.

In the second embodiment, a first recess 51 and a second recess following the first seal portion 47 and the second seal portion 48 near the outer periphery and the step portion 61 in the center direction are provided on both side surfaces of the rotor 37. 52
Are formed. A plurality of linear projections (blades) 59 extending radially from the vicinity of the inner periphery of the bottom surface of the substantially annular first recess 51 and the second recess 52 to the outer periphery are formed. The thickness of the protrusion is substantially constant, and when the rotor 37 rotates, the lubricating oil receives energy from the protrusion 59, and the lubricating oil flows out of the outer periphery of the first hollow chamber 63 and the second hollow chamber 64. Other features of the second embodiment are the same as those of the first embodiment.

[0014]

According to the vane type vacuum pump of the present invention, a plurality of straight or curved projections extending from the vicinity of the inner periphery to the outer periphery of the bottom surface of the first and second recesses perpendicular to the rotation axis of the rotor. When the projection is rotated together with the rotor, the lubricating oil sucked into the first hollow chamber and the second hollow chamber receives energy from the projection, and the lubricating oil that has received the energy passes through the first hollow chamber and the second hollow chamber. 2 Outflow from the outer periphery of the hollow chamber. And the first hollow chamber and the second
Lubricating oil flowing out from the outer periphery of the hollow chamber is supplied to the side gap between the seal portion on the outer peripheral portion on both sides of the rotor and the inner surface of the housing and the gap between both sides of the vane and the inner surface of the housing, Friction and wear between the rotor and the inner surface of the housing and between the vane side and the inner surface of the housing are reduced, and seizure is prevented.

[Brief description of the drawings]

FIG. 1 (a) is a first sectional view of a vane type vacuum pump according to an embodiment of the present invention, and FIG. 1 (b) is FIG. 1 (a).
FIG. 2 is a sectional view taken along line II of FIG.

FIG. 2 (a) is a first sectional view of an embodiment of a vane type vacuum pump according to the present invention, and FIG. 2 (b) is FIG. 2 (a).
FIG. 2 is a sectional view taken along line II-II of FIG.

3 (a) is a sectional view of a conventional vane type vacuum pump, and FIG. 3 (b) is a sectional view taken along line III-III of FIG. 3 (a).

[Explanation of symbols]

 26 Second housing 28 Second protruding support part 31 Shaft 32 Central hole 33 Lubricating oil supply port 34 Tip part 36a Cam surface 37 Rotor 39 Vane groove 40 Vane 47 First seal part 48 Second seal part 51 First concave part 52 Second Recess 53 Communication hole 55 Inner surface of first housing 56 Inner surface of second housing 57 Oil passage 59 Projection 63 First hollow chamber 64 Second hollow chamber

Claims (2)

[Claims] 1. A tip end of a vane inserted into a vane groove of a rotor is opposed to a cam surface of a housing, and substantially annular first and second concave portions are formed on both side surfaces of the rotor.
A first hollow chamber and a second hollow chamber are respectively formed between the second recess and the inner surface of the housing, and the first hollow chamber and the second hollow chamber are communicated with each other by a communication hole formed in the rotor, and the first hollow chamber is formed. In a vane type vacuum pump in which a chamber is communicated with a lubricating oil supply port, a plurality of straight lines or curves extending from the vicinity of the inner periphery of the bottom surface to the outer periphery on the bottom surfaces of the first and second recesses perpendicular to the rotation axis of the rotor. When the protrusion rotates together with the rotor, the lubricating oil sucked into the first hollow chamber and the second hollow chamber receives energy from the protrusion, and the lubricating oil that has received the energy flows into the first hollow chamber. And a vane type vacuum pump which is discharged from the outer periphery of the second hollow chamber. 2. A center hole is formed in the projecting support portion of the housing, a tip end of a shaft connected to the rotor is supported by the center hole, and a lubricating oil supply port is formed in an opening of the center hole. The hollow chamber is communicated with the lubricating oil supply port via an oil passage, and lubricating oil flowing out of the outer circumference of the first hollow chamber and the second hollow chamber is sealed with outer peripheral seal portions on both side surfaces of the rotor and the inner surface of the housing. And a gap between both side surfaces of the vane and the inner surface of the housing.
The described vane type vacuum pump.