Expansible chamber devices – Displacement control of plural cylinders arranged in... – Parallel cylinders
Reexamination Certificate
2002-12-11
2004-08-31
Look, Edward K. (Department: 3745)
Expansible chamber devices
Displacement control of plural cylinders arranged in...
Parallel cylinders
C092S071000
Reexamination Certificate
active
06782798
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a coupling structure of a drive shaft to a swash plate assembly in a variable capacity swash plate type compressor.
2. Background of the Related Art
A compressor in an air conditioner for vehicles selectively receives power transmitted via an engine crank pulley from an engine in order to suck in heat-exchanged refrigerant from an evaporator, compress refrigerant through linear reciprocating motion of a piston and then discharge refrigerant to a condenser.
In the variable capacity swash plate type compressor, an example of the prior art is disclosed in Korean Utility Model Registration No.2002-28619 published on Apr. 17, 2002.
As shown in
FIGS. 1 and 2
, a swash plate assembly
10
has a hub
11
and a swash plate
15
. The hub
11
has a boss
12
with a drive shaft through-hole
13
for passage of a drive shaft
20
. The through-hole
13
has angular and substantially rectangular inner surfaces defined by first vertical and horizontal sections
16
and
14
. The boss
12
has a single pin hole
12
a
intersecting perpendicular with the through-hole
13
for the drive shaft.
The swash plate
15
has a coupling hole
15
a
coupled to an outer periphery of the hub
11
, and a piston
40
is coupled to an edge of the swash plate
15
as shown in FIG.
1
.
In the meantime, in the drive shaft through-hole
13
of the boss
12
, the drive shaft
20
has outer surfaces defined by second vertical and horizontal sections
21
and
22
configured substantially identical with the inner surfaces of the drive shaft through-holes
13
.
The second vertical section
22
of the drive shaft
20
has a single slot
23
in the axial direction for allowing slidable motion of a coupling pin
30
which is inserted through the pin hole
12
a
in the boss
12
.
According to a conventional configuration of the drive shaft coupled to the swash as set forth above, the hub
11
is supported by the drive shaft
20
via coupling of the coupling pin
30
so that the rotation center of the swash plate assembly
10
moves along the drive shaft
20
without variation.
The drive shaft
20
has the slot
23
in the longitudinal direction, which is coupled to the coupling pin
30
which is supported by the boss
12
of the hub
11
so that the coupling pin
30
moves along the slot
23
as the inclination angle of the swash plate assembly
10
increases.
Therefore the hub
11
moves while pivoting along the drive shaft
20
without any variation of rotation center.
However, the prior art of the above construction has disadvantages as follows.
First, in order to minimize bending moment applied to the single coupling pin
30
when the rotary torque of the drive shaft
20
is transferred to the hub
11
of the swash plate assembly
10
, and allow the inner surfaces of the drive shaft through-hole
13
to have a configuration capable of accepting the variation in inclination angle of the swash plate assembly
10
in respect to the drive shaft
20
, and to stably support the drive shaft
20
in the angle-varied inclination position of the swash plate assembly
10
, the drive shaft through-hole
13
has a substantially rectangular internal cross section and the drive shaft
20
partly has a substantially rectangular external cross section corresponding to the internal cross section of the drive shaft through-hole
13
to be inserted into the drive shaft through-hole
13
. However, the prior art has drawbacks in that the cross sections of the drive shaft through-hole
13
and the drive shaft
20
are additionally formed into the rectangular ones and the swash plate assembly must be precisely processed in terms of an inclination angle of the swash plate assembly
10
.
Second, the second vertical and horizontal sections
21
and
22
of the drive shaft
20
frictionally contact with the second vertical the first section
16
of the hub
11
by a large amount thereby poorly carrying out the variation in inclination angle of the swash plate assembly
10
.
Third, the swash plate
15
of the swash plate assembly
10
is frequently twisted owing to compressive load of the piston
40
during actuation of the compressor. However, since this twist is not fundamentally prevented, it is impossible to vary the inclination angle of the swash plate in a more stable manner.
In the meantime, in the above variable capacity swash type compressor, other examples of the prior art include Japanese Patent Laid-open Publication No. Hei6-307333 published on Nov. 1, 1994 and Japanese Patent Laid-open Publication No. Hei8-14157 published on Jan. 16, 1996.
Even though the above other examples of the prior art are not illustrated in the drawings, they have constructions each having a single slot for insertably receiving a single coupling pin so that the coupling pin can shift.
However, these examples of the prior art also produce the second disadvantage according to the first example of the prior art.
SUMMARY OF THE INVENTION
The present invention has been made to solve the foregoing problems and it is therefore an object of the present invention to provide a coupling structure between a drive shaft and a swash plate assembly in a variable capacity swash plate type compressor, which is so modified that the rotating force of the drive shaft can be transferred to a rotor and the swash plate assembly by substantially equal amounts so as to prevent the frictional of a driving unit as well as prolong life time.
According to an aspect of the invention to obtain the above objects, it is provided a coupling structure between a drive shaft and a swash plate assembly in a variable capacity swash plate type compressor which rotates the swash plate assembly, which is hingeably coupled to one side of a rotor in such a manner that its inclination angle is adjustable, under the rotating force of the drive shaft to reciprocate a piston within a cylinder bore, the coupling structure comprising: the swash plate assembly which includes a drive shaft through-hole for passage of the drive shaft, a hub having a boss with a plurality of pin holes on the outer circumferential surface thereof, and a plate coupled to the outer periphery of the boss and having the piston mounted thereon; the drive shaft which includes a plurality of slots formed thereon in an axial direction to correspond to the pin holes of the hub, the slots communicating and intersecting with each other; and a plurality of coupling pins inserted through the pin holes and the corresponding slots to couple the swash plate to the drive shaft.
REFERENCES:
patent: 5239913 (1993-08-01), Terauchi
patent: 5850775 (1998-12-01), Stiefel
patent: 5980216 (1999-11-01), Tokumasu
patent: 6307333 (1994-11-01), None
patent: 8014157 (1996-01-01), None
patent: 11125176 (1999-04-01), None
Halla Climate Control Corporation
Leslie Michael
Look Edward K.
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