Expansible chamber devices – Displacement control of plural cylinders arranged in... – Parallel cylinders
Patent
1997-10-15
1999-11-23
Ryznic, John
Expansible chamber devices
Displacement control of plural cylinders arranged in...
Parallel cylinders
91505, F04B 126
Patent
active
059880406
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a variable displacement swash plate compressor intended for use in a climate control system for a vehicle and, more particularly, to an improved structure which enables smooth movement of a swash plate capable of changing its angle of inclination with respect to a plane perpendicular to the axis of a rotational drive shaft of the compressor, as well as axial movement of the swash plate, by a simple swash plate support means.
RELATED ART
Many compressors have been proposed in which the discharge capacity of a compressor is adjustably varied by changing the stroke of the pistons thereof due to a change in an angular displacement of a swash plate (including a combined assembly of a rotating swash plate and a non-rotatable wobble plate). For example, a variable displacement swash plate compressor disclosed in Japanese Unexamined (Kokai) patent publication No. 62-87678 is designed to simplify a swash plate support mechanism. As shown in FIG. 11, in this previously proposed variable displacement swash plate type compressor, a swash plate 45 is disposed in a crank chamber 42. A drive shaft 43 is extended through the swash plate 45 via a boss 52 thereof in a manner such that the boss is provided with a bore 55 formed therein to have a wall surface capable of coming into partial contact with the drive shaft to thereby determine a radial position of the swash plate 45, and allow the angle of inclination of the swash plate to change. Thus, sliders and pivotal pins, which are essential components of the conventional variable displacement swash plate compressors, can be omitted. The swash plate 45 is guided for movement along a fixed path of displacement by the drive shaft 43 in partial contact with a lower curved surface 55b of the bore 55 of the swash plate 45.
In the described prior art compressor, a moment produced by a reaction force resulting from the exertion of a compressing force acting on the swash plate 45 in the direction of inclination is borne by a support mechanism including an elongated slot 53 and a pin 53a, and the lower curved surface 55b in contact with the drive shaft 43. Therefore, when the angle of inclination of the swash plate 45 is changed, the curved surface 55b in linear contact with the drive shaft 43 slides under a load in a predetermined section of the drive shaft 43. A moment produced by a reaction force resulting from the exertion of a compressing force acts in a direction perpendicular to the direction of inclination of the swash plate 45 owing to the structural condition of the swash plate 45, and this moment is born by a portion of a small diameter of a long bore serving as the bore 55. When the inclination of the swash plate 45 is changed, the edges of diagonally opposite portions of a small diameter at the front and the rear ends of the bore 55 come into linear sliding contact with the drive shaft 43.
Furthermore, the moment bearing ability of the single support mechanism for supporting the swash plate 45 of the prior art compressor disposed in the crank chamber 42 is very low as compared with that of a duplex support mechanism such as disclosed in, for example, Japanese Unexamined (Kokai) patent publication No. 6-288347 consisting of a pair of support mechanisms disposed respectively on the opposite sides of the drive shaft, and a pressure acting on the surface in sliding contact with the drive shaft 3 necessarily increases. Accordingly, local abrasion develops in the drive shaft and the surface defining the bore 55 if the surface defining the bore 55 and in linear contact with the shaft 43 slides repeatedly through a relatively long distance, so that accurate, smooth variation of the angle of inclination of the swash plate 5 cannot be achieved.
Although not described in the afore-mentioned Japanese Unexamined (Kokai) patent publication No. 62-87678, it is very difficult to hold the swash plate of the variable displacement swash plate compressor accurately at a minimum angle of inclination. Therefore, if the minimum angle of inc
REFERENCES:
patent: 4842488 (1989-06-01), Terauchi
patent: 4846049 (1989-07-01), Terauchi
patent: 5259736 (1993-11-01), Terauchi
patent: 5540559 (1996-07-01), Kimura et al.
patent: 5713725 (1998-02-01), Kawaguchi et al.
patent: 5882179 (1999-03-01), Ota et al.
Hidaka Shigeyuki
Kobayashi Hisakazu
Okadome Youichi
Ota Masaki
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
Ryznic John
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