Claims
- 1. An axial pump comprising:
- a housing have a chamber and an inlet channel into said chamber for fluid;
- a swash plate mounted for rotation in said chamber, rotation of said swash plate within said chamber producing a pressure gradient in the fluid disposed in said chamber adjacent the plate surface so that the pressure of fluid adjacent the central axis of said swash plate is less than the pressure of fluid adjacent the peripheral edge of said swash plate, the pressure gradient increasing with increasing rotational speed of said swash plate;
- a plurality of axial pistons mounted for reciprocal axial movement in response to rotation of said swash plate to pump said fluid; and
- a cylinder housing having a plurality of piston bores each mounting one of said pistons having at least a single suction bore which is connected to one of said piston bores for supplying fluid to that piston bore, such suction bore having a single opening immediately adjacent said plate surface adjacent said central axis of said plate so as to be in communication with an area of low pressure fluid generated by said plate, said cylinder housing having a plurality of exhaust channels for transmitting fluid from said piston bores to an exhaust.
- 2. A pump as in claim 1 wherein a plurality of suction bores are radially and inwardly offset with respect to said piston bores.
- 3. A pump as in claim 1 wherein one suction bore is provided for each piston bore.
- 4. A pump as in claim 3 wherein said housing has a plurality of suction channels each connecting a suction bore to a piston bore.
- 5. A pump as in claim 1 further including a pressure guide element at each suction bore opening.
- 6. A pump as in claim 1 wherein said housing has a central bore further including a piston mounted in said bore, a ball at the outer end of said central piston and a spring in said central bore engaging said central piston for urging said ball against said swash plate.
- 7. A pump as in claim 1 wherein said suction bore is a circumferential slot.
- 8. A pump as in claim 7 wherein said slot cuts into said piston bore.
- 9. An axial pump comprising:
- a housing having a chamber and an inlet channel into said chamber for fluid;
- a swash plate mounted for rotation in said chamber, rotation of said swash plate within said chamber producing a pressure gradient in the fluid disposed in said chamber adjacent the plate surface so that the pressure of fluid adjacent the central axis of said swash plate is less than the pressure of fluid adjacent the peripheral edge of said swash plate, the pressure gradient increasing with increasing rotational speed of said swash plate;
- a plurality of axial pistons mounted for reciprocal axial movement in response to rotation of said swash plate to pump said fluid; and
- a cylinder housing having a plurality of piston bores each mounting one of said pistons and having a plurality of suction bores each with a single opening disposed immediately adjacent said plate surface, each suction bore being connected to one of said piston bores for supplying fluid to that piston bore, at least one of said openings being defined immediately adjacent the central axis of said swash plate so as to be in an area of low pressure fluid generated by said swash plate and at least another of said openings being radially outwardly disposed relative to said at least one opening so as to be in an area of high pressure fluid generated by said swash plate, said cylinder housing having a plurality of exhaust channels for transmitting fluid from said piston bores to an exhaust.
- 10. A pump as in claim 9 wherein a plurality of suction bores are radially and inwardly offset with respect to said piston bores.
- 11. A pump as in claim 9 further including a pressure guide element at each suction bore opening.
- 12. A pump as in claim 9 wherein said housing has a central bore further including a piston mounted in said bore, a ball at the outer end of said central piston and a spring in said central bore engaging said central piston for urging said ball against said swash plate.
- 13. A pump as in claim 9 wherein one suction bore is provided for each piston bore.
- 14. A pump as in claim 13 wherein said housing has a plurality of suction channels each connecting a suction bore to a piston bore.
- 15. A pump as in claim 9 wherein at least one of said suction bores is a circumferential slot.
- 16. A pump as in claim 15 wherein said slot is at the outer circumference of said chamber.
- 17. A pump as in claim 16 wherein said slot cuts into said piston bore.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3440850 |
Nov 1984 |
DEX |
|
Parent Case Info
This is a continuation-in-part of application Ser. No. 796,437, filed Nov. 8, 1985 which was abandoned upon the filing thereof.
US Referenced Citations (7)
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
796437 |
Nov 1985 |
|