Vane groove grinding apparatus for compressor cylinder

Details Vane groove grinding apparatus for compressor cylinder Vane groove grinding apparatus for compressor cylinder

2000-07-26

2002-04-23

Nguyen, George (Department: 3723)

Abrading

Machine

Combined

C451S057000, C451S063000, C451S119000, C451S160000, C451S162000

Reexamination Certificate

active

06375555

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to a vane groove grinding apparatus for a compressor cylinder containings an inner hole and a vane groove extending radially outwardly from the inner hole.
FIG. 8
is a perspective view showing a conventional vane groove grinding apparatus in which a compressor cylinder
1
held in the shown position by a holding means (not shown) has an inner hole
2
(center line: O
1
) and a vane groove
3
extending radially outwardly from the inner hole. In the inner hole
2
, a holder
5
and a thin cylindrical inside grinder
6
are inserted, the holder
5
being attached on the left end of a grinding apparatus, a right end of the grinder
6
being connected to a spindle
7
and the left end of the grinder
6
being rotationally received by the holder
5
. While keeping the grinder
6
in high speed rotation by the spindle
7
, when the body
4
is driven in the direction of arrow X
1
together with the grinder
6
, the grinder
6
grinds one surface of the opposing surfaces of the groove
3
, and when the body
4
is driven in the reverse direction from arrow X
1
, the grinder
6
grinds another surface of the opposing surfaces of the groove
3
.
8
is an open space. Generally in the vane type compressor, the cylinder
1
is covered by side housings from both sides, and a rectangular vane plate in the groove
3
contacts on the outer surface of an eccentric rotor (not shown).
But, according to the above grinding system, abrasion on the grinder
6
differs at places of different distances from its proximal end, which causes the deterioration of plane degree (accuracy) and parallel degree (accuracy) of the opposing surfaces of the groove
3
. In addition, due to the small diameter of the grinder
6
, its grinding speed on the surface and its rigidity are inevitably low, these disadvantages increase as the width of the groove gets small.
In a disk grinding system shown in
FIG. 9
, a grinding disk
10
supported by a bar-shaped holder
9
and driven in the direction of arrow X
2
by way of a drive force transmitting means installed inside the holder
9
, grinds one surface of the opposing surfaces of the groove
3
when the holder
9
moves to the left in the direction of arrow X
2
, and grinds another surface of the groove
3
when the holder
9
returns in the reverse direction to the position of FIG.
9
.
But, according to the grinding system of
FIG. 9
, since the projecting distance of the holder
9
varies as the grinding process proceeds and the holder
9
is a cantilever the plane degree and parallel degree of the opposing surfaces of the groove
3
are inevitably unstable. In addition, it is difficult to change the grinding disk, in that it is necessary to change the grinding disk
10
, belts, bearings and the like.
SUMMARY OF THE INVENTION
An object of this invention is to improve manufacturing accuracy, especially for plane degree and parallel degree, and manufacturing efficiency. A first embodiment is a vane groove grinding apparatus for a compressor cylinder comprising a compressor cylinder holding means, the compressor cylinder being provided with an inner hole and a vane groove extending radially outwardly from the inner hole, sliders being movable along a center line of the inner hole and along a right angled direction to the vane groove, a grinding disk holder facing one open side of the inner hole and a support for locking said holder facing another open side of the inner hole both being disposed on a slider adjacent to the compressor cylinder, when the grinding disk is inserted in the vane groove a distal end of the grinding disk holder is firmly engaged in the support.
A second embodiment is a vane groove grinding apparatus as described above, in which the compressor cylinder holding means is an index table being provided with a plurality of working stations at regular intervals with clampers.
A third embodiment is a vane groove grinding apparatus of the type of the first embodiment, in which one of the engaging portions of the holder and support is a wedge shaped projection and another portion is a wedge shaped slot.
A fourth embodiment is a vane groove grinding apparatus of the type of the first embodiment, in which the sliders are composed with combined plural sliders.


REFERENCES:
patent: 4625465 (1986-12-01), Kirt
patent: 5171112 (1992-12-01), Roland
patent: 5690541 (1997-11-01), Dalke
patent: 03-75232 (1991-03-01), None
patent: 05-269654 (1993-10-01), None

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