IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0488444
(2002-09-05)
|
우선권정보 |
DE-101 46 137(2001-09-19); DE-101 57 248(2001-11-22) |
국제출원번호 |
PCT/EP02/009954
(2002-09-05)
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§371/§102 date |
20040303
(20040303)
|
국제공개번호 |
WO03/025347
(2003-03-27)
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발명자
/ 주소 |
|
출원인 / 주소 |
- Brueninghaus Hydromatik GmbH
|
대리인 / 주소 |
Scully, Scott, Murphy &
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
3 |
초록
▼
A hydrostatic machine with a cylinder block (6), within which sleeve holes (28b) are arranged, in which sleeves (28) sit, surrounding piston bores (28a) in which pistons (29) are mounted, such as to be displaced back and forth and the pistons (29) extend into the cylinder block (5 ) such as to defin
A hydrostatic machine with a cylinder block (6), within which sleeve holes (28b) are arranged, in which sleeves (28) sit, surrounding piston bores (28a) in which pistons (29) are mounted, such as to be displaced back and forth and the pistons (29) extend into the cylinder block (5 ) such as to define cylinders (26) with the front ends thereof. According to the invention, the risk of piston seizure can be reduced, whereby the sleeves (28) comprise an axially-defined recess ( 41) in the outer surface thereof, in the region facing away from the cylinder and the region with the greatest piston radial force, pressing the pistons (29) against the wall of the piston bore.
대표청구항
▼
The invention claimed is: 1. A hydrostatic machine with a cylinder block having sleeve holes formed therein, sleeves seated in said holes and surrounding piston bore, pistons being mounted in said bores for reciprocatory displacement, said pistons extending into the cylinder block so as to define c
The invention claimed is: 1. A hydrostatic machine with a cylinder block having sleeve holes formed therein, sleeves seated in said holes and surrounding piston bore, pistons being mounted in said bores for reciprocatory displacement, said pistons extending into the cylinder block so as to define cylinders at front ends thereof, the sleeves each, in a region facing away from the cylinder and at least in a region of a greatest piston radial force pressing the piston against a wall of the piston bore, have an axially-defined recess which is arranged in a region of the center of gravity of the piston in an outer surface thereof, and wherein a throughput volume of the hydrostatic machine is adjustable and the recess is positioned in the region of the center of gravity when the hydrostatic machine is adjusted to a minimum throughput volume. 2. The hydrostatic machine according to claim 1, wherein said recess or the center axis thereof as viewed in the axial direction of the hydrostatic machine, is arranged in a region of an outer quadrant of the sleeve, whereby the quadrant is directed in a circumferential direction enclosing an angle of inclination. 3. The hydrostatic machine according to claim 1, wherein the recess and/or a further recess comprises an annular recess. 4. The hydrostatic machine according to claim 1, wherein the recess is entirely arranged in each instance in a longitudinal half of the sleeve facing away from the cylinders. 5. The hydrostatic machine according to claim 4, wherein the radius of the rounded shape corresponds to a four to six-fold of a the cross-sectional dimension of the piston bore. 6. The hydrostatic machine according to claim 1, wherein the respective recess is approximately 3 mm to 10 mm distant from ends of the sleeves facing away from the cylinders. 7. The hydrostatic machine according to claim 1, wherein an axial dimension of the recess corresponds to about 3/10 to 7/10 of the diameter of the piston bore. 8. The hydrostatic machine according to claim 1, wherein at least a base of the recess is rounded in a circular arc section shape. 9. The hydrostatic machine according to claim 8, wherein the radius of the rounded shape corresponds to a four to six-fold of a cross-sectional dimension of the piston bore. 10. The hydrostatic machine according to claim 1, wherein the recess is connected with a cooling channel of a cooling device which comprises a cooling circuit. 11. The hydrostatic machine according to claim 10, wherein the cooling channel connects a fluid space arranged in the cylinder block with a fluid space surrounding the cylinder block. 12. A hydrostatic machine with a cylinder block having sleeve holes formed therein, sleeves seated in said holes and surrounding piston bores, pistons being mounted for reciprocatory displacement, said pistons extending into the cylinder block so as to define cylinders at front ends thereof, the sleeves in each instance including an axially-defined recess which is arranged in a region of a center of gravity of the piston in an inner surface thereof in a region facing away from the cylinder, wherein the recess in each instance is located at least in a region of a greatest piston radial force pressing the piston against a wall of the piston bore, and wherein a throughput volume of the hydrostatic machines is adjustable and the recess is positioned in the region of the center of gravity, when the hydrostatic machine is adjusted to a minimum throughput volume. 13. The hydrostatic machine according to claim 12, wherein the sleeve holes, in each instance, viewed in said region of the inner surface of said piston facing away from the cylinder and at least in a region of the greatest piston radial force pressing the piston against the wall of the piston bore, have an axially-defined further recess in the inner surface thereof, and wherein the recess and the further recess are radially aligned with each other. 14. The hydrostatic machine according to claim 13, wherein the recess and/or the further recess comprises an annular recess. 15. The hydrostatic machine according to claim 12, wherein viewed in an axial direction of the hydrostatic machine, the recess or central axis thereof is arranged in a region of an outer quadrant of the sleeve, wherein the quadrant is directed in a circumferential direction enclosing an angle of inclination. 16. The hydrostatic machine according to claim 12, wherein the recess in each instance is arranged completely within a longitudinal half of the sleeve facing away from the cylinders. 17. The hydrostatic machine according to claim 12, wherein the respective recess is approximately 3 mm to 10 mm distant from ends of the sleeves facing away from the cylinders. 18. The hydrostatic machine according to claim 12, wherein an axial dimension of the recess corresponds to about 3/10 to 7/10 of the diameter of the piston bore. 19. The hydrostatic machine according to claim 12, wherein at least a base of the recess is rounded in a circular arc section shape. 20. The hydrostatic machine according to claim 12, wherein the recess is connected with a cooling channel of a cooling device which comprises a cooling circuit. 21. The hydrostatic machine according to claim 20, wherein the cooling channel connects a fluid space arranged in the cylinder block with a fluid space surrounding the cylinder block.
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