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Cylinder block of an axial piston compressor with elongated cylinder face

Imported: 24 Feb '17 | Published: 06 Jan '04

Otfried Schwarzkopf

USPTO - Utility Patents

Abstract

Cylinder block (

32) of an axial piston compressor (

20), in particular for use in a vehicle air conditioner with CO

2 as coolant, which comprises at least one, in particular several cylinder bores distributed about a periphery, each of which defines a cylinder face and accommodates a piston (

8) consisting of piston shaft (

8

a) and piston neck (

8

b), wherein the piston neck (

8

b) outside the cylinder bore serves for coupling to a swash- and/or wobble-plate drive mechanism (

29, 33) operatively connected to a rotatable drive shaft (

1), by means of which the piston (

8) is movable back and forth within the cylinder bore, between a top-dead-center point (OT) and a bottom-dead-center point (UT), and wherein the edge of the opening of the cylinder face on the drive-mechanism side comprises at least one recess (

26

d) that can be at least partially engaged by a transitional region (

8

c) disposed between the shaft (

8

a) and the neck (

8

b) of the piston, so that the cylinder face effective for the piston (

8) is enlarged or elongated.

Description

In the following the invention is described with reference to exemplary embodiments, shown in greater detail in the attached drawings, wherein

FIG. 1

a is a cross-section of a cylinder block for an axial piston compressor constructed in accordance with the invention;

FIG. 1

b is a view along the line A—A of FIG. 1

a;

FIG. 2 is a side cross-sectional view of the cylinder liner utilized in the present invention;

FIG. A—A is a view along the line A—A of FIG. 2;

FIG. 3 is a side cross-sectional view of an alternate embodiment of the cylinder liner of FIG.

2 and FIG. B—B is a view along the line B—B of FIG. 3;

FIG. 4 is a side cross-sectional view of a prior art axial piston compressor;

FIG. 5 is a side cross-sectional view of the cylinder block of FIG. 1 illustrating the driving of the pistons by a wobble plate;

FIG. 6 is a graph illustrating the transverse forces acting on a piston;

FIG. 7 shows a prior art axial piston compressor;

FIG. 8 shows a prior art axial piston compressor;

FIG. 9 is a side view of a prior art axial piston compressor; and

FIGS. 10

a through

10

c illustrate the position of the piston recess and the transverse forces acting on the piston.

Claims

1. A cylinder block (

32) of an axial piston compressor (

20) for use in a vehicle air conditioner that utilizes CO

2 as a coolant comprising,

2. The cylinder block of claim 1 wherein both of said bore edge and said liner edge include a recessed portion engageable by said transitional portion.

3. The cylinder block of claim 1 wherein said recessed portion is disposed in an area in which the transverse force acting on said piston is at a minimum.

4. The cylinder block of claim 1 wherein said recessed edge portion is disposed on said bore opposite the side of said piston operatively connected to said drive mechanism.

5. The cylinder block of claim 1 wherein said recessed portion extends over an angular region between 80° and 160°.

6. The cylinder block of claim 1 wherein said recessed portion extends over an angular region of 120°.

7. The cylinder block of claim 1 wherein said liner includes a beveled outer edge.

8. The cylinder block of claim 1 wherein said liner is provided with a pair of recesses disposed diametrically opposite each other.