Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Reexamination Certificate
1998-10-20
2001-01-30
Kamen, Noah P. (Department: 3747)
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
C417S269000, C092S012200
Reexamination Certificate
active
06179571
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates in general to compressors for use in a refrigerating cycle of an automotive air conditioning system, and more particularly to compressors of a swash plate type.
2. Description of the Prior Art
In order to clarify the task of the present invention, one conventional compressor of the above-mentioned type will be outlined, which is described in Japanese Patent First Provisional Publication 7-103138.
The compressor comprises a case having a crank chamber is therein, a drive shaft rotatably installed in the case, a drive plate fixed to the drive shaft to rotate therewith, a sleeve axially slidably disposed on the drive shaft, a journal pivotally mounted on the sleeve, a swash plate tightly disposed on the journal, a transmission/hinge mechanism arranged between the drive plate and the journal for transmitting the rotation of the drive shaft to the journal while permitting a pivotal movement of the journal relative to the sleeve, a plurality of cylinders defined in the case, and a plurality of pistons driven by the swash plate to be reciprocatively moved in the cylinders. To a back side of the case, there is mounted through a valve plate a rear housing which has refrigerant intake and exhaust chambers formed therein.
The transmission/hinge mechanism comprises a first arm projected from the drive plate, a second arm projected from the journal, an elongate opening formed in the first arm and a pin held by the second arm and slidably engaged with the elongate opening. When, due to rotation of the drive shaft, the drive plate is rotated therewith, the rotation of the drive plate is transmitted to the journal through the pivotally engaged first and second arms while permitting the pivotal movement of the journal on the sleeve. During this, due to an inherent construction of the transmission/hinge mechanism, leading portions (which are termed in view of the direction in which the drive plate rotates under normal operation of the compressor) of the pivotally engaged first and second arms are applied with a marked stress as compared with trailing portions of the same. That is, under operation of the compressor, the maximum compression load of the pistons is applied to the leading portions through the swash plate. This phenomenon tends to cause a poor rotation transmission from the drive plate to the journal as well as a poor pivoting movement of the journal relative to the sleeve.
Hitherto, many attempts have been made for eliminating the above-mentioned drawbacks. However, almost all the attempts have failed to exhibit satisfied results.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a swash plate type compressor which is free of the above-mentioned drawbacks.
It is another object of the present invention to provide a swash plate type compressor wherein a leading portion of the transmission/hinge mechanism is reinforced by a simple structure.
It is still another object of the present invention to provide a swash plate type compressor wherein a rotation unit including a drive shaft, a drive plate, a journal and a swash plate can smoothly and precisely rotate about the axis of drive shaft.
According to the present invention, there is provided a swash plate type compressor which comprises a case; a drive shaft installed in the case and rotatable about its axis; a drive plate fixed to the drive shaft to rotate therewith; a sleeve axially slidably disposed on the drive shaft; a journal pivotally mounted on the sleeve; a swash plate disposed on the journal to move therewith; and a transmission/hinge mechanism arranged between the drive plate and the journal to transmit the rotation of the drive shaft to the journal permitting the pivotal movement of the journal relative to the sleeve, wherein the transmission/hinge mechanism includes a first arm possessed by one of the drive plate and the journal, the first arm having an elongate through hole; two spaced second arms possessed by the other of the drive plate and the journal, the second arms being so spaced as to intimately put therebetween the first arm, the second arms having cylindrical bores which are aligned; and a pin including a middle portion slidably received in the elongate through hole and axially opposed end portions press-fitted in the cylindrical bores of the second arms, the press-fitting of the pin with the cylindrical bore of a leading one of the second arms being stronger in strength than that with the cylindrical bore of a trailing one of the second arms.
REFERENCES:
patent: 4674957 (1987-06-01), Ohta et al.
patent: 4712982 (1987-12-01), Inagaki et al.
patent: 5105728 (1992-04-01), Hayase et al.
patent: 5181453 (1993-01-01), Kayukawa et al.
patent: 5706716 (1998-01-01), Umemura
patent: 5749712 (1998-05-01), Umemura
patent: 5-195949 (1993-08-01), None
patent: 6-101640 (1994-04-01), None
patent: 7-103138 (1995-04-01), None
patent: 8-61231 (1996-03-01), None
Kawachi Masaki
Miyaji Toshikatsu
Calsonic Kansei Corporation
Foley & Lardner
Gimie Mahmoud M
Kamen Noah P.
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