Pumps – Three or more cylinders arranged in parallel – radial – or...
Reexamination Certificate
2000-03-23
2002-05-07
Freay, Charles G. (Department: 3746)
Pumps
Three or more cylinders arranged in parallel, radial, or...
C417S571000
Reexamination Certificate
active
06382927
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to valve plate assembly positioning structures for compressors.
Japanese Unexamined Utility Model Publication No. 55-156282 and Japanese Unexamined Patent Publication No. 10-231783 describe typical valve plate assembly positioning structures for compressors. These structures includes projections, or dowels. Specifically, as shown in
FIGS. 6 and 7
, a piston type compressor of Japanese Unexamined Utility Model Publication No. 55-156282 includes a cylinder block
51
and a housing section
52
. A valve plate assembly
53
is arranged between the cylinder block
51
and the housing section
52
. The valve plate assembly
53
includes a first section
54
, a main section
55
, a second section
56
, and a third section
57
.
A plurality of cylinder bores
58
are formed in the cylinder block
51
. Each cylinder bore
58
accommodates a piston
59
. The pistons
59
move in the associated cylinder bores
58
. The main section
55
has suction ports
55
a
and discharge ports
55
b
. The first section
54
includes a plurality of suction valves
54
a
. Each suction valve
54
a
is located at a position corresponding to the associated suction port
55
a
. The second section
56
includes a plurality of discharge valves
56
a
. Each discharge valve
56
a
is located at a position corresponding to the associated, discharge port
55
b.
The main section
55
has a plurality of (in this case, two) projections
60
. The projections
60
are formed in the main section
55
by pressing. As shown in
FIG. 7
, the second section
56
has a plurality of (in this case, two) holes
61
at positions corresponding to the projections
60
. A discharge chamber
62
and a suction chamber
63
are defined in the housing section
52
. The suction chamber
63
surrounds the discharge chamber
62
. A partition
52
a
separates the discharge chamber
62
from the suction chamber
63
.
As shown in
FIG. 6
, the first section
54
, the main section
55
, and the third section
57
are secured to an outer wall
64
of the rear housing section
52
and an outer wall of the cylinder block
51
by a plurality of pins
66
. The second section
56
is positioned relative to the main section
55
by engagement of the projections
60
with the associated holes
61
.
Normally, the second section
56
of the valve plate assembly
53
is sized to fit in the discharge chamber
62
. As described above, a positioning structure for the second section
56
includes the projections
60
.
However, if the valve plate assembly positioning structure employs the projections
60
, the projections
60
must be formed on the main section
55
with a press. This step complicates the manufacturing procedure of the main section
55
. Furthermore, since the length of the projections
60
is relatively small, the compressor may be assembled without fitting the projections
60
of the main section
55
securely in the associated holes
61
of the second section
56
. The second section
56
may thus deviate from the proper position relative to the main section
55
. To avoid this problem, the length of the projections
60
may be increased such that the projections
60
are more reliably fitted in the associated holes
61
. This measure would prevent the second section
56
from deviating from the proper position relative to the main section
55
. However, if the length of the projections
60
is increased, the accuracy of forming the projections
60
is decreased, thus reducing the positioning accuracy of the second section
56
.
Furthermore, the projections
60
may be replaced by pins. However, this increases the number of parts used for positioning the valve plate assembly
53
, thus complicating the positioning structure as a whole.
SUMMARY OF THE INVENTION
Accordingly, it is an objective of the present invention to provide a simplified valve plate assembly positioning structure for compressors.
To achieve the above objective, the present invention provides a compressor. The compressor comprises a cylinder block having a cylinder bore. A housing element has a suction chamber and a discharge chamber. A valve plate assembly is located between the cylinder block and the housing element to separate the cylinder bore from the suction chamber and the discharge chamber. The valve plate assembly includes a plurality of plate elements. The housing element is connected with cylinder block through the valve plate assembly. A positioning member engages all the plate elements to determine the position of the valve plate assembly relative to at least one of the cylinder block and the housing element.
Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
REFERENCES:
patent: 4226572 (1980-10-01), Nakayama et al.
patent: 4950132 (1990-08-01), Brian, Jr. et al.
patent: 5100306 (1992-03-01), Moran, Jr. et al.
patent: 5316447 (1994-05-01), Fujii et al.
patent: 5613836 (1997-03-01), Takenaka et al.
patent: 196 14 186 (1996-10-01), None
patent: 0 447 027 (1991-09-01), None
patent: 1119710 (1968-07-01), None
patent: 55-156282 (1980-11-01), None
patent: 02-090368 (1990-07-01), None
patent: 09-209931 (1997-08-01), None
patent: 09-264254 (1997-10-01), None
patent: 10-231783 (1998-09-01), None
European Patent Office Communication, Application No. 00106956.6, Date Jan. 22, 2001.
Adaniya Taku
Nishimura Kenta
Sonobe Masanori
Tarutani Tomoji
Freay Charles G.
Gray Michael K.
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
Morgan & Finnegan , LLP
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