JP2000297757A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor by which the excellent assembly property of a bearing and shaft sealed device is obtained. SOLUTION: This compressor includes a shaft 11, inserted in the inside/ outside of a housing on the center axis X of the housing, for driving a compression mechanism and the bearing shaft sealed device interposed between the housing and shaft 11 and the bearing shaft sealed device has a front shaft bearing 4 having the bearing function supporting and rotating the shaft 11 and a lip seal 5 for preventing the flow out of the fluid from the inside of the housing to the outside and the front shaft bearing 4 is constituted integrally with the lip seal 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor used for a vehicle air conditioner, and more particularly to a bearing / shaft sealing device for a compressor.

[0002]

2. Description of the Related Art Conventionally, there have been known scroll compressors of a type in which a fixed scroll and a movable scroll are engaged with each other at an angle to give a relative circular motion to reduce the volume, and a rotary motion of a swash plate. A swash plate compressor of a type that converts fluid into reciprocating motion of a piston and compresses a fluid is known.

[0003] Hereinafter, the scroll type compressor will be described as an example of the prior art. As shown in FIG. 6, a scroll-type compressor according to the related art has a compressor housing 10 forming an outer shell. The housing 10 has a front housing 100 and a rear housing 101 formed of a large-diameter bottomed cylindrical body. The front housing 100 has a large-diameter cylindrical portion 103 and a small-diameter cylindrical portion 105 fixed to the open end of the rear housing 101. Rear housing 101 and front housing 100
Are arranged with the same central axis.

[0004] A shaft 11 is arranged on a center axis X of the housing 10. The shaft 11 passes through the small-diameter cylindrical portion 105 of the front housing 100 and
Stretching inside. The shaft 11 is the front housing 1
Shaft large diameter portion 1 surrounded by a large diameter cylindrical portion 103
1b. At the end of the shaft large diameter portion 11b,
A drive pin 12 extending parallel to the axis X is eccentrically fixed from the axis X.

The large-diameter shaft portion 11b is connected to the large-diameter cylindrical portion 1 of the front housing 100 via a ball bearing 13.
03 is rotatably supported. Shaft 11
7, the small-diameter cylindrical portion 1 of the front housing 100 via the front shaft bearing 4 as shown in FIG.
05 is rotatably supported. A lip seal 5 is interposed between the small-diameter cylindrical portion 105 of the front housing 100 and the shaft 11 on the large-diameter cylindrical portion 103 side. Further, a felt ring 6 is interposed between the small-diameter cylindrical portion 105 of the front housing 100 and the shaft 11. The felt ring 6 is interposed between the front shaft bearing 4 and the lip seal 5.

The front shaft bearing 4 has a bearing function for supporting the shaft 11 and rotating smoothly. The lip seal 5 serves to prevent gas in the front housing 100 from flowing out from between the shaft 11 and the small-diameter cylindrical portion 105 of the front housing 100.

The small-diameter cylindrical portion 1 of the front housing 100
An electromagnetic clutch 15 having a coil 15b is disposed radially outward on the outer peripheral surface of the coil 05 via a ball bearing 9. The electromagnetic clutch 15 is rotatably fitted on the small-diameter cylindrical portion 105, and is connected to a pulley 15a and a small-diameter portion 11a connected to an external drive source via a V-shaped belt (not shown).
And a rotation transmission plate 15c fixed to an end of the rotation transmission plate 15c.

In the rear housing 101, a fixed scroll 16 as a compression mechanism is provided. The fixed scroll 16 is provided concentrically with the axis X, and has a disc-shaped end plate 16 a fitted to the rear housing 101.
and a spiral body 16b formed on one surface of the a. The rear housing 101 includes a leg 101b formed on the other surface of the end plate 16a. Fixed scroll 1
6 is a case where the leg 101b is the bottom 101 of the rear housing 101.
In a state in which it abuts on a, it is fixed to the rear housing 101 by bolts 17. The internal space of the rear housing 101 is partitioned into a suction chamber 18 and a discharge chamber 19 by an end plate 16 a of the fixed scroll 16.

An end plate 16a of the fixed scroll 16 has a discharge hole 16d formed at the center thereof. Discharge hole 16
d is closed by a valve plate 41 provided on the discharge chamber 19 side. A retainer 42 having one end fixed to the end plate 16a is provided on the valve plate 41.

A movable scroll 2 serving as a compression mechanism is provided in the rear housing 101 adjacent to the fixed scroll 16.
0 is provided. The movable scroll 20 includes a disk-shaped end plate 20a, a spiral body 20b formed on one surface of the end plate 20a, and an annular boss 20c formed on the other surface of the end plate 20a. . The center axis Y of the end plate 20a is eccentric from the axis X by a distance rs. Movable scroll 20
The spiral body 20b of the fixed scroll 16
And a phase difference of 180 degrees.

A thick disk-shaped bush 21 disposed concentrically with the end plate 20a is rotatably fitted in the boss 20c via a needle bearing 22. The bush 21 has an eccentric through-hole 21a extending parallel to the axis X. A balance weight 23 extending in the radial direction is fixed. The through hole 21a slidably accommodates the drive pin 12 fixed to the large-diameter shaft portion 11b of the shaft 11. Pin 21b formed on bush 21
Is fitted into a hole slightly larger in diameter than the pin 21b formed at the end of the shaft large diameter portion 11b of the shaft 11.

Further, as shown in FIGS. 10 to 13,
A donut-plate-shaped front housing-side race 24 fixed to the end of the large-diameter cylindrical portion 103 of the front housing 100, and a donut-plate-shaped movable scroll-side race 25 fixed to the end plate 20a of the orbiting scroll 20, are circumferentially arranged. A plurality of balls 26 interposed between the front housing side race 24 and the movable scroll side race 25 at a distance from each other constitute a ball coupling for preventing the movable scroll from rotating. The front housing side race 24 and the orbiting scroll side race 25 face each other via a plurality of balls 26.

Such a compressor has a fixed scroll 16.
Engage with the movable scroll 20 by shifting the angle,
A relative circular motion (only a revolving motion) is given to reduce the volume while moving the closed space formed between the fixed scroll 16 and the movable scroll 20 in the center direction, and the valve plate 41 is opened by the pressure and discharged. It is configured to discharge the compressed fluid from the hole 16d to the discharge chamber 19.

As another conventional compressor, a swash plate compressor described in Japanese Patent Application Laid-Open No. 5-149250 is known. This swash plate type compressor also has a bearing function similar to that of the scroll type compressor.

[0015]

In the conventional compressor, a small-diameter cylindrical portion 105 of a front housing 100 is provided.
Since the front shaft bearing 4 and the lip seal 5 must be separately provided between the shaft 11 and the shaft 11, two steps are required to mount the front shaft bearing 4 and the lip seal 5 on the shaft 11. Because of the necessity, there is a problem that the assemblability is poor.

Further, since the front shaft bearing 4 and the lip seal 5 are respectively mounted at positions separated in the axial direction of the shaft 11, the front housing 1
The small-diameter cylindrical portion 105 must be designed to be long in the axial direction, and there is a problem that the mounting space becomes large.

Further, the front shaft bearing 4
Is filled with grease, but there is a problem that when gas and oil enter from the lip seal 5 side, the grease leaks from the opposite side.

Therefore, an object of the present invention is to provide a compressor capable of assembling and saving space.

Another object of the present invention is to provide a compressor capable of eliminating grease.

[0020]

According to the present invention, there is provided a housing provided with a compression mechanism for compressing a fluid, and the housing is inserted from the inside of the housing to the outside through an opening of the housing on a central axis of the housing and the compression is performed. In a compressor including a shaft for driving a mechanism, and a bearing / shaft sealing device interposed between the housing and the shaft,
The shaft sealing device includes a front shaft bearing having a bearing function of supporting and rotating the shaft, and a lip seal for preventing the fluid from flowing out of the housing. A compressor characterized in that the lip seal and the lip seal are integrally formed is obtained.

[0021]

The compressor of the present invention has a bearing / shaft sealing device in which the front shaft / bearing and the lip seal are integrally formed between the front housing and the shaft. Therefore, the bearing / shaft sealing device is mounted on the shaft. This can be done with only one step.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a scroll compressor according to the present invention will be described below with reference to the accompanying drawings. Since the compressor has the same configuration as the compressor having the configuration described with reference to FIG. 6, the same portions are denoted by the same reference numerals also using FIG. 6, and the description of the portions having the same configuration will be omitted.

Referring to FIG. 1, in the first embodiment, the shaft 11 has a shaft 11b surrounded by a large-diameter cylindrical portion 103 of the front housing 100. The shaft 11 is connected to the front housing 10 via a front shaft bearing 4 as shown in FIG.
It is rotatably supported by a small-diameter cylindrical portion 105 of zero. A lip seal 5 is interposed between the small-diameter cylindrical portion 105 of the front housing 100 and the shaft 11 on the opening side of the small-diameter cylindrical portion 105. The lip seal 5 is provided integrally with the front shaft bearing 4.

A lip seal 5 is provided between the small-diameter cylindrical portion 105 of the front housing 100 and the shaft 11.
A felt ring 6 is interposed outside of the felt ring 6. The lip seal 5 and the front shaft / bearing 4 constitute a bearing / shaft sealing device. As clearly shown by the enlarged views shown in FIGS. 2 and 3, the front shaft bearing 4 is provided concentrically at a predetermined interval on an inner ring portion 41 and an outer peripheral surface of the inner ring portion 41. It has an outer race 43 and a ball 45 interposed between the inner race 41 and the outer race 43.

On the outer peripheral surface of the inner ring portion 41 and the inner peripheral surface of the outer ring portion 43, there are formed annular ball receiving grooves 41a and 43a in which a part of the ball 45 is located at a central portion. Also,
On the outer peripheral surface of the inner ring portion 41, first and second inner ring grooves 41b and 41c each having an annular shape and a substantially V-shaped cross section are formed at both ends in the axial direction.
Are formed. On the inner peripheral surface of the outer ring portion 43, first and second outer ring grooves 43b and 43c having a substantially V-shaped cross section are formed at both ends in the axial direction. A first seal member 61 is provided between the second inner ring groove 41c and the second outer ring groove 43c so as to close the space S between the inner ring part 41 and the outer ring part 43.

An annular lip seal 5 is mounted on one of both axial end surfaces of the inner ring portion 41 and the outer ring portion 43. The lip seal 5 has a first inner ring groove 4 on one end side.
1b and a first metallic lip member 53 attached to the first outer ring groove 43b, and the first lip member 5
3, a second lip member 55 made of rubber and provided on the third lip member, a third lip member 57 made of resin and provided on the second lip member 55, and a third lip member And an annular metal plate-shaped holding member 59 provided on the upper surface 57.

The first lip member 53 is engaged with the annular holding plate portion 53a and the first outer ring groove 43b extending radially from the outer peripheral end of the holding plate portion 53a. An engaging portion 53b extending radially from the inner peripheral end of the holding plate portion 53a and being inserted into the first inner ring groove 41b on one end side with a gap therebetween, having an approximately V-shaped cross section.
Holding annular portion 5 erected on one surface of holding plate portion 53a
3d.

The second lip member 55 has a lip portion 55a in contact with one surface of the inner ring portion 41 and the outer surface of the holding plate portion of the first lip member 53, and a second lip member 55 at one end from the lip portion 55a. The first inner ring groove 41b and the second lip member 53
A lip engaging portion 55b having a Z-shaped cross section fitted between the insertion portions 53c, an inner annular portion 55c in contact with the inner peripheral surface of the holding annular portion 53d of the first lip member 53, And an outer annular portion 55d in contact with the outer peripheral surface of the holding annular portion 53d of the lip member 53. The outer annular portion 55d is formed so as to be gradually thinner toward the outer peripheral side of the engaging portion 53b, and extends above the engaging portion 53b.

The third lip member 57 is mounted inside the inner annular portion 55c of the second lip member 55, and is in contact with the outer surface of the lip portion 55a. The third lip member 57 has an annular groove 57g formed on a surface opposite to a surface in contact with the outer surface of the lip portion 55a.

The holding member 59 is in contact with the distal end surface of the holding annular portion 53d of the first lip member 53, and presses the third lip member 57 between itself and the second lip member 55. The holding member 59 has an annular protrusion 59f formed on the surface of the third lip member 57 facing the groove 57g, and the protrusion 59f is formed by the groove 57g of the third lip member 57.
It is fitted in.

Small-diameter cylindrical portion 1 of front housing 100
On the inner wall surface of 05, a step portion 105d is formed at an intermediate portion in the axial direction and projects annularly from the inner wall surface. The small-diameter cylindrical portion 105 has a step portion 105d on the shaft large-diameter portion 11b side.
Lip seal 5 and front shaft bearing 4
Is installed in a contact state. The felt ring 6 is incorporated in the small-diameter cylindrical portion 105 on the opening side and near the step portion 105d.

As described above, in the lip seal 5 and the front shaft bearing 4 constituting the bearing / shaft sealing device, the front shaft bearing 4 has a bearing function of supporting the shaft 11 and rotating smoothly.

The lip seal 5 is used as a shaft sealing means and a sealing means as the shaft 11 and the front housing 100.
Between the small-diameter cylindrical portion 105 of the front housing 100
It serves to prevent the gas inside from flowing out and to prevent the gas inside the front housing 100 from entering the housing 10.

FIGS. 4 and 5 show a second embodiment of the bearing and shaft sealing device in the compressor of the present invention. In the description of the second embodiment, parts that perform the same functions as those described in the first embodiment will be described with the same reference numerals.

Referring to FIG. 4 and FIG.
As shown in FIG. 4, the small-diameter cylindrical portion 10 of the front housing 100 is interposed via the front shaft bearing 4.
5 rotatably supported. A lip seal 5 is interposed between the small-diameter cylindrical portion 105 of the front housing 100 and the shaft 11 on the large-diameter cylindrical portion 103 side. Lip seal 5 is front shaft bearing 4
Are provided integrally.

Further, a small-diameter cylindrical portion 10 is provided between the small-diameter cylindrical portion 105 of the front housing 100 and the shaft 11.
A felt ring 6 is interposed on the opening side of the wire 5.

The lip seal 5 and the front shaft / bearing 4 together constitute a bearing / shaft sealing device.
The front shaft bearing 4 includes an inner ring portion 41, as clearly shown by the enlarged view shown in FIG.
An outer ring portion 43 provided concentrically at predetermined intervals on the outer peripheral surface of the inner ring portion 41; an inner ring portion 41 and an outer ring portion 4;
3 and a ball 45 interposed therebetween.

Annular ball receiving grooves 41a and 43a are formed in the outer peripheral surface of the inner ring portion 41 and the inner peripheral surface of the outer ring portion 43 at a central portion to position a part of the ball 45. Also,
On the outer peripheral surface of the inner ring portion 41, first and second inner ring grooves 41b and 41c each having an annular shape and a substantially V-shaped cross section are formed at both ends in the axial direction.
Are formed. On the inner peripheral surface of the outer ring portion 43, first and second outer ring grooves 43b and 43c having a substantially V-shaped cross section are formed at both ends in the axial direction.

The first inner ring groove 41b of the inner ring portion 41 and the first outer ring groove 43b of the outer ring portion 43 are provided in the inner ring portion 41 and the outer ring portion 4 respectively.
A first seal member 61 is attached so as to close the space S between the three. A second seal member 62 is attached to the second inner race groove 41c of the inner race part 41 and the second outer race groove 43c of the outer race part 43 so as to close the space S between the inner race part 41 and the outer race part 43.

The outer ring portion 43 on the side of the second outer ring groove 43c is formed with an engaging projection 43m projecting in the axial direction. An annular lip seal 5 is mounted on the engagement projection 43m.

The lip seal 5 is an annular and metallic first lip seal.
Lip member 531 and an annular and rubber-made second lip member 55 sandwiching the first lip member 531
1, an annular and resin-made third lip member 571 provided inside the second lip member 551, and engagement projections for holding the first to third lip members 531, 551 and 571. An annular metal plate-shaped holding member 591 whose outer peripheral edge is engaged with 43 m is provided.

The first lip member 531 has a holding plate portion 531a formed in an annular shape, and an engaging portion 531b extending radially from the outer peripheral end of the holding plate portion 53a.

The second lip member 551 includes a lip portion 551a sandwiching the first lip member 531, a lip engagement portion 551b extending from the lip portion 551a to the engagement protrusion 43m, and a lip portion 551a. From shaft 1
1 has an annular portion 551d extending to the outer peripheral surface.

The third lip member 571 is mounted inside the annular portion 551d of the second lip member 551, and is in contact with the inner surface of the lip portion 551a. Further, an annular groove 571g is formed in the third lip member 571 on a surface opposite to a surface in contact with the outer surface of the lip portion 551a.

The holding member 591 has the first lip member 5
31 are in contact with the tip end surfaces of the lip engaging portions 551b,
The third lip member 571 is pressed between the third lip member 571 and the second lip member 551. The holding member 591 has an annular protrusion 591f formed on a surface of the third lip member 571 facing the groove 571g, and the protrusion 591f is fitted into the groove 571g of the third lip member 571. I have.

Small-diameter cylindrical portion 1 of front housing 100
On the inner wall surface of 05, a step portion 105e is formed at an intermediate portion in the axial direction so as to protrude annularly from the inner wall surface. The small-diameter cylindrical portion 105 has a step portion 105e on the shaft large-diameter portion 11b side.
Lip seal 5 and front shaft bearing 4
Is installed in a contact state. The felt ring 6 is incorporated in the small-diameter cylindrical portion 105 on the opening side and near the step portion 105e.

As described above, in the lip seal 5 and the front shaft bearing 4 constituting the bearing / shaft sealing device, the front shaft bearing 4 has a bearing function of supporting the shaft 11 and rotating smoothly. The lip seal 5 also serves to prevent gas in the front housing 100 from flowing out from between the shaft 11 and the small-diameter cylindrical portion 105 of the front housing 100.

In this embodiment, the bearing / shaft sealing device employed in the scroll type compressor has been described as an example. However, the bearing / shaft sealing device is not limited to this, and the swash plate type compressor and other components may be used. The present invention is also applicable to the structure of a bearing / shaft sealing device in a shaft.

[0049]

As described above, according to the compressor of the present invention, the bearing / shaft seal in which the front shaft / bearing and the lip seal are integrally formed between the small diameter cylindrical portion of the front housing and the shaft. Because we have the device,
Since the mounting of the bearing / shaft sealing device on the shaft can be performed by only one process, excellent assemblability can be obtained.

Further, since the front shaft bearing and the lip seal are integrated, the small diameter cylindrical portion of the front housing can be designed to be short in the axial direction.
Space saving can be achieved.

Further, since it is not necessary to fill the front shaft bearing with grease, when gas and oil enter from the lip seal side, grease does not leak from the opposite side.

[Brief description of the drawings]

FIG. 1 shows a first bearing / shaft sealing device in a compressor according to the present invention.
It is sectional drawing which shows embodiment of this invention.

FIG. 2 is an enlarged perspective view showing a cross section of a part of the bearing / shaft sealing device shown in FIG.

FIG. 3 is an exploded perspective view of a part of the bearing / shaft sealing device shown in FIG. 2;

FIG. 4 shows a second bearing / shaft sealing device in the compressor of the present invention.
It is sectional drawing which shows embodiment of this invention.

5 is an enlarged perspective view showing a cross section of a part of the bearing and shaft sealing device shown in FIG.

FIG. 6 is a longitudinal sectional view showing a conventional scroll type compressor.

FIG. 7 is a sectional view of the bearing / shaft sealing device shown in FIG. 6;

[Explanation of symbols]

 Reference Signs List 5 lip seal 10 housing 11 shaft 11b large-diameter cylindrical portion 16 fixed scroll 16a end plate 18 suction chamber 19 discharge chamber 20 movable scroll 20a end plate 26 ball 41 inner ring portion 41b first inner ring groove 41c second inner ring groove 43 outer ring portion 45 Ball 53, 531 First lip member 55, 551 Second lip member 57 Third lip member 59 Holding member 100 Front housing 101 Rear housing 105 Small diameter cylindrical portion 105d, 105e Step portion

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // F04C 18/02 311 F04C 18/02 311B 311M 311P F-term (Reference) 3H003 AA00 AB07 AC03 AD03 BC01 CA02 CE01 3H029 AA02 AA15 AA21 AB03 BB16 BB32 CC09 CC17 CC20 3H039 AA02 AA12 BB08 BB15 CC12 CC31 CC33 3J006 AE16 AE38 3J016 AA02 BB03 CA03 CA06

Claims (4)

[Claims] 1. A housing in which a compression mechanism for compressing a fluid is housed, a shaft that is inserted through the opening of the housing from the inside of the housing on a central axis of the housing and drives the compression mechanism, and the housing, In a compressor including a bearing and a shaft sealing device interposed between the shafts, the bearing and the shaft sealing device support the shaft and rotate the front shaft bearing having a bearing function to rotate the fluid from inside to outside of the housing. Wherein the front shaft bearing and the lip seal are integrated with each other. 2. The compressor according to claim 1, wherein said lip seal is provided integrally with said front shaft bearing on said opening side. 3. The compressor according to claim 1, wherein said lip seal is integrally provided on said front shaft bearing on a side opposite to said opening side. 4. The compressor according to claim 1, wherein said lip seal prevents said fluid from discharging out of said housing, and prevents outside air from entering said housing. A compressor comprising: a second shaft sealing means; and a sealing means for preventing leakage of the fluid between inside and outside of the housing.