JP2007064159A - Clutchless compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clutchless compressor capable of inhibiting intrusion of water into a radial bearing even if a pulley manufactured by sheet metal working is used. <P>SOLUTION: This compressor is provided with a rotary shaft, a compression mechanism driven by the rotary shaft and a housing storing the rotary shaft and the compression mechanism. The rotary shaft extends out of the housing passing through a boss part of the housing. The pulley rotatably supported by the boss part of the housing via a radial bearing externally fitted and fixed on the boss part of the housing is connected to an end part of the rotary shaft extending out of the housing without via an electromagnetic clutch and is operatively engaged with an external drive source. An annular member is fixed on one end of the boss part of the pulley and an annular end surface facing the annular member with a small interval is formed on the housing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a clutchless compressor.

A rotation shaft; a compression mechanism driven by the rotation shaft; and a housing that accommodates the rotation shaft and the compression mechanism. The rotation shaft extends out of the housing through the boss portion of the housing, and is external to the boss portion of the housing. A pulley rotatably supported by a boss portion of the housing through a fixed radial bearing is connected to the end of the rotating shaft extending out of the housing without an electromagnetic clutch and is operatively engaged with an external drive source. Patent Document 1 discloses a clutchless compressor in which an annular end surface facing a gap between one end of a boss portion of a pulley is formed on a housing.
In the clutchless compressor of Patent Document 1, the intrusion of water into the radial bearing is suppressed by one end of the boss portion of the pulley and the annular end surface of the housing facing each other with a minute gap therebetween, and the durability of the radial bearing Will improve.
JP2004-11455

In recent years, vehicle air-conditioning compressors have a tendency to employ pulleys manufactured by sheet metal processing in order to improve productivity and reduce weight. The pulley manufactured by sheet metal processing is bent and fixed to the outer race of the radial bearing by bending both ends of the boss, but since the outer surface of the bent part is an arc surface, the end of the boss and the annular end surface of the housing It becomes difficult to form a minute gap between them.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a clutchless compressor capable of suppressing water intrusion into a radial bearing even when a pulley manufactured by sheet metal processing is used.

In order to solve the above-described problems, the present invention includes a rotation shaft, a compression mechanism driven by the rotation shaft, and a housing that houses the rotation shaft and the compression mechanism, and rotates through a boss portion of the housing. The shaft extends out of the housing, and a pulley rotatably supported by the boss portion of the housing via a radial bearing that is fitted and fixed to the boss portion of the housing is connected to the end of the rotating shaft that extends out of the housing via an electromagnetic clutch. Without being connected and operatively engaged with an external drive source, an annular member is fixed to one end of the boss portion of the pulley, and an annular end surface facing the annular member with a minute gap is formed in the housing. A clutchless compressor is provided.
In the clutchless compressor according to the present invention, since the annular member is fixed to one end of the boss portion of the pulley, both ends of the boss portion of the pulley manufactured by sheet metal processing are bent and press-fitted and fixed to the outer race of the radial bearing, Even when the outer surface of the bent portion forms an arc surface, a minute gap can be formed between the annular member and the annular end surface of the housing instead of one end of the boss portion of the pulley, and water to the radial bearing can be formed. Can suppress the intrusion of

The annular member may be fixed to one end of the boss portion of the pulley by holding the inner edge portion of the annular member between one end of the radial bearing and one end of the boss portion of the pulley, or the annular member may be fixed to the boss portion of the pulley. You may fix to one end of the boss | hub part of a pulley by press-fitting in one end of.
In the above case, the weight of the compressor can be reduced by making the annular member made of synthetic resin.

The annular member may be fixed to one end of the boss portion of the pulley by being welded to one end of the boss portion of the pulley.
In the above case, a plurality of protrusions arranged at intervals in the circumferential direction and directed to one end of the boss part of the pulley are formed on the annular member, and the protrusions are spot welded to one end of the boss part of the pulley. Also good. Spot welding can reduce the labor of welding. By spot welding the protrusions, the strength of the welded portion can be increased.

A plurality of receding wing-like spiral grooves may be formed on the surface facing the housing end surface with a minute gap in the annular member, or a receding wing shape on the surface facing the housing end surface with a minute gap in the annular member A plurality of spiral protrusions may be formed.
Using the centrifugal force generated by the rotation of the annular member and a plurality of receding wing-like grooves or receding wing-like spiral recesses sandwiched between the receding wing-like spiral projections, water flowing into the minute gap It is possible to efficiently discharge from the gap.

In the clutchless compressor according to the present invention, since the annular member is fixed to one end of the boss portion of the pulley, both ends of the boss portion of the pulley manufactured by sheet metal processing are bent and press-fitted and fixed to the outer race of the radial bearing, Even when the outer surface of the bent portion forms an arc surface, a minute gap can be formed between the annular member and the annular end surface of the housing instead of one end of the boss portion of the pulley, and water to the radial bearing can be formed. Can suppress the intrusion of

A clutchless compressor according to an embodiment of the present invention will be described.
As shown in FIG. 1, a clutchless swash plate compressor A includes a rotary shaft 1, a compression mechanism 5 having a rotor 2, a swash plate 3, and a piston 4 and driven by the rotary shaft 1, And a housing 6 for accommodating the compression mechanism 5.
The rotating shaft 1 extends outside the housing through the boss portion 6a of the housing. A radial bearing 7 is fitted and fixed to the boss 6a of the housing. A pulley 8 is rotatably supported by a boss portion 6 a of the housing via a radial bearing 7. The pulley 8 is connected to the end of the rotary shaft 1 extending outside the housing via a torque limiter 9 without using an electromagnetic clutch, and is operatively engaged with an external drive source (not shown).
The pulley 8 is manufactured by sheet metal processing. As shown in FIGS. 1 and 2, the pulley 8 is press-fitted and fixed to the outer race 7a of the radial bearing by bending both ends of the boss portion 8a. The outer surface of the bent portion at both ends of the boss portion 8a forms an arc surface.
The annular plate 10 is fixed to one end of the boss portion 8a in a state in which the folded inner edge is sandwiched between a bent portion at one end of the boss portion 8a and one end of the outer race 7a of the radial bearing.
An annular end face 6 b that faces the annular plate 10 with a minute gap S therebetween is formed in the housing 6.
The inner back portion of the annular gap S forms an annular cavity portion 11. The annular cavity 11 is opposed to one end of the radial bearing 7 via the annular gap S ′.

In the clutchless swash plate compressor A, since the annular plate 10 is fixed to one end of the boss portion 8a of the pulley 8, both ends of the boss portion 8a of the pulley 8 manufactured by sheet metal processing are bent to remove the radial bearing 7 from the outer side. Even when the outer surface of the boss 8a bent portion forms an arcuate surface by being press-fitted and fixed to the race 7a, instead of one end of the boss 8a of the pulley, between the annular plate 10 and the annular end surface 6a of the housing 6 A minute gap S can be formed, and the intrusion of water 7 into the radial bearing can be suppressed.

As shown in FIG. 3, the annular plate 10 may be fixed to one end of the boss portion 8 a of the pulley 8 by press-fitting the annular plate 10 into one end of the boss portion 8 a of the pulley 8.
2 and 3, the annular plate 10 may be made of metal or synthetic resin, but if made of synthetic resin, the weight of the compressor can be reduced.

As shown in FIG. 4A, the annular plate 10 may be fixed to one end of the boss portion 8 a of the pulley 8 by welding to the one end of the boss portion 8 a of the pulley 8.
In this case, as shown in FIG. 4 (b), a plurality of protrusions 10a that are arranged at intervals in the circumferential direction and are directed to one end of the boss 8a of the pulley 8 are formed on the annular plate 10, and the protrusions 10a may be spot welded to one end of the boss portion 8a of the pulley 8. Spot welding can reduce the welding effort compared to fillet welding or the like. By spot welding the protrusion 10a, the strength of the welded portion can be increased.

As shown in FIG. 5, a plurality of receding wing-like spiral grooves 10b or receding wing-like spiral projections 10c may be formed on the surface of the annular plate 10 facing the housing end surface 6b with a minute gap S therebetween. .
Using the centrifugal force generated by the rotation of the annular plate 10 and a plurality of receding wing-like grooves 10b or a plurality of receding wing-like spiral recesses 10d sandwiched between the receding wing-like spiral projections 10c, the minute gap S is formed. The inflowing water can be efficiently discharged from the minute gap S outward in the radial direction.

The present invention can be widely used not only for a clutchless swash plate type compressor but also for various clutchless compressors directly connected to an external drive source without using an electromagnetic clutch, such as a clutchless swing plate type compressor.

It is sectional drawing of the clutchless swash plate type compressor which concerns on the Example of this invention. It is a partial expanded sectional view of the clutchless swash plate type compressor which concerns on the Example of this invention. It is a partial expanded sectional view of the clutchless swash plate type compressor which concerns on the Example of this invention. It is a partial expanded sectional view of the clutchless swash plate type compressor which concerns on the Example of this invention. It is a front view of the annular plate with which the clutchless swash plate type compressor which concerns on the Example of this invention is provided.

Explanation of symbols

A Clutchless swash plate type compressor S, S 'annular gap 2 rotor 3 swash plate 4 piston 5 compression mechanism 6 housing 7 radial bearing 8 pulley 9 torque limiter 10 annular plate 11 annular cavity

Claims (8)

A rotation shaft; a compression mechanism driven by the rotation shaft; and a housing that accommodates the rotation shaft and the compression mechanism. The rotation shaft extends out of the housing through the boss portion of the housing, and is external to the boss portion of the housing. A pulley rotatably supported by a boss portion of the housing through a fixed radial bearing is connected to the end of the rotating shaft extending out of the housing without an electromagnetic clutch and is operatively engaged with an external drive source. A clutchless compressor, wherein an annular member is fixed to one end of a boss portion of a pulley, and an annular end surface facing the annular member with a minute gap is formed in the housing. The clutchless compressor according to claim 1, wherein the inner edge portion of the annular member is sandwiched between one end of the radial bearing and one end of the boss portion of the pulley. The clutchless compressor according to claim 1, wherein the annular member is press-fitted into one end of a boss portion of the pulley. The clutchless compressor according to claim 2 or 3, wherein the annular member is made of a synthetic resin. The clutchless compressor according to claim 1, wherein the annular member is welded to one end of a boss portion of the pulley. The annular member has a plurality of protrusions arranged at intervals in the circumferential direction and directed toward one end of the boss portion of the pulley, and the protrusion is spot welded to one end of the boss portion of the pulley. The clutchless compressor according to claim 5. The clutchless compressor according to any one of claims 1 to 6, wherein a spiral groove having a receding wing shape is formed on a surface facing the end surface of the housing across a minute gap of the annular member. The clutchless compressor according to any one of claims 1 to 6, wherein a spiral wing-like spiral protrusion is formed on a surface of the annular member facing the housing end surface with a minute gap therebetween.

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