Expansible chamber devices – With lubricating means – Portion of expansible chamber device includes solid...
Reexamination Certificate
2002-10-28
2004-04-13
Lazo, Thomas E. (Department: 3745)
Expansible chamber devices
With lubricating means
Portion of expansible chamber device includes solid...
C092S187000
Reexamination Certificate
active
06718864
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a closed compressor in which a connecting rod is connected to a piston with a ball of the connecting rod seated in a ball seat formed in the piston.
BACKGROUND OF THE INVENTION
As a conventional technology, there has been a closed compressor as disclosed in JP-B No. H2-36794.
In
FIG. 19
showing the conventional technology of the closed compressor used in a refrigeration cycle, an electric motor
22
and a compressor mechanism section
23
are housed in a closed housing
21
.
The compressor mechanism section
23
has an eccentrically rotating crankshaft
26
on the top end of a shaft
25
axially supported on a frame
24
. A piston
28
reciprocally sliding in the cylinder
27
is connected to the crankshaft
26
through a connecting rod
29
.
The connecting rod
29
and the piston
28
, as shown in
FIG. 20
, are connected through a ball joint
30
.
The connecting rod
29
includes a rod portion
33
on both ends of which a ball portion
31
and a ring portion
32
which is connected with the crankshaft
26
are fixedly attached.
The piston
28
is provided with a ball seat
34
in which the ball portion
31
of the connecting rod
29
seats. Before the ball portion
31
seats in the ball seat
34
, a cover section provided at the ball seat
34
for covering the ball portion
31
is in the open position to allow insertion of the ball portion
31
. After the insertion of the ball portion
31
into the ball seat
34
with the cover section in the open position, the spreading cover section of the ball seat
34
is closed and caulked (to cover the ball portion
31
), so that the rod portion
33
fixedly jointed to the ball portion
31
may be rockably connected to the ball seat
34
.
The ball portion
31
slides in the ball seat
34
during the operation of the closed compressor. Therefore, it is necessary to supply a lubricating oil between the ball portion
31
and the ball seat
34
.
SUMMARY OF THE INVENTION
As a structure for supplying the lubricating oil between the ball portion
31
and the ball seat
34
stated above in JP-B No. H2-36794, a lubricating oil supply passage is formed by creasing the cover section of the ball seat
34
which covers the ball portion
31
.
However, the structure for supplying the lubricating oil between the ball portion
31
and the ball seat
34
stated in JP-B No. H2-36794 has such a disadvantage as the lack of general versatility because a special caulking tool is needed.
There, however, are cases where, if the special tool is used, the lubricating oil supply passage of desired shape is unobtainable depending upon the opened state of the cover section of the ball seat
34
.
In view of the above-described disadvantage, it is an object of this invention to provide a structure which will facilitate the assembly of the piston (ball seat) and the connecting rod (ball) and the smooth supply of lubricating oil to the ball and the ball seat.
To achieve the object, this invention has the structure that the ball portion of the connecting rod is provided with a flat section parallel with the end surface of the ring, and the piston is provided with a groove section which enables the insertion of the ball into the ball seat.
The groove section is desired to have at least the same width as the ball portion of the connecting rod which has a flat section.
Furthermore, the groove section should be formed long enough to reach at least the maximum-diameter portion of the ball seat. Since a ring portion is joined to the crankshaft which eccentrically rotates in relation to the shaft, the connecting rod assembled to the piston moves principally in a direction perpendicular to the shaft in accordance with the eccentric rotation of the crankshaft. It is, therefore, desirable to assemble the groove section of the piston in a position parallel to the shaft.
Because of the above-described structure, there is formed a space between the groove section of the piston and the flat cut portion of the connecting rod. This space serves as a lubricating oil inlet to the ball joint section. During the operation of the closed compressor, the ball section must be kept within the ball seat against the relative rotation of the piston and the connecting rod. To keep the ball section within the ball seat, it is desirable to provide a rotation restricting member for regulating the free rotation of the piston in relation to the connecting rod. The rotation restricting member must not interfere with smooth supply of the lubricating oil to the ball seat. If the lubricating oil is applied by splash-lubrication from the end of the crankshaft, it is desirable to adopt the structure that the space formed between the groove section of the piston on the crankshaft end side and the flat cut portion of the connecting rod is opened.
REFERENCES:
patent: 3482487 (1969-12-01), Leffers
patent: 3871782 (1975-03-01), Johansson
patent: 4279041 (1981-07-01), Buchholz
patent: 4913001 (1990-04-01), Watanabe et al.
patent: 5048993 (1991-09-01), Yoon
patent: 5118263 (1992-06-01), Fritchman
patent: 6450297 (2002-09-01), Kim
patent: 4024319 (1991-02-01), None
patent: 460644 (1937-01-01), None
patent: 53-106906 (1978-09-01), None
Abe Nobuo
Konno Gen
Antonelli Terry Stout & Kraus LLP
Hitachi , Ltd.
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