Vehicle

Patent metadata

Field	Value
Publication number	US-10066609-B2
Application number	US-201214648918-A
Country	US
Kind code	B2
Filing date	Dec 7, 2012
Priority date	Dec 7, 2012
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

It is intended to provide a vehicle comprising a fluid working machine which can reduce wear of parts and be produced at low cost. The fluid working machine 11, 12 is provided with an eccentric cam 17 , a piston 18 A to 18 F, a cylinder 19 A to 19 F, a drive rod 20 A- 20 F having an engaging part 24 engaging with the piston and a contact part 25 contacting the eccentric cam 17 , a holding member 34 A to 34 F surrounding the drive rod, a pressing member 40 A to 40 F for pressing up the holding member in a radially outward direction, and at least one holding ring 41 for holding the holding member from the outside.

First claim

What is claimed is:

1. A device comprising:
a hydraulic pump;
a hydraulic actuator which is driven by pressurized oil supplied from the hydraulic pump;
wherein at least one of the hydraulic pump and the hydraulic actuator is a fluid working machine which comprises:
an eccentric cam;
a plurality of pistons arranged radially around the eccentric cam;
a plurality of cylinders provided for the plurality of pistons, respectively, each of the pistons being configured to reciprocate along a radial direction of the eccentric cam by rotation of the eccentric cam;
a plurality of drive rods which are provided for the plurality of pistons, respectively, and wherein at least one of said drive rods comprises:
a main part that extends along a corresponding one of the cylinders;
an engaging part that is formed at one end of the main part and is engaged with corresponding one of the pistons;
a contact part that is formed at the other end of the main part and contacts the eccentric cam;
a holding member that is arranged about the main part and extends along the axial direction of the drive rod;
a pressing member which presses the holding member, outward in the radial direction of the eccentric cam; and
at least one holding ring which is arranged on the radially outwards side of the holding member to hold the holding member from the radially outwards side of the holding member.

2. The device according to claim 1 ,
wherein the holding member comprises a cylindrical part surrounding the main part and an inward flange part provided at the radially outwards end of the cylindrical part,
wherein the contact part has a diameter larger than the main part so that a stepped portion is formed between the contact part and the main part,
wherein the pressing member is arranged in an annular space formed between an inner surface of the cylindrical part and an outer surface of the main part to press the inward flange part in a direction apart from the stepped portion.

3. The device according to claim 2 ,
wherein the holding member comprises a pair of grooves on both sides of the cylindrical part, and
wherein the fluid working machine comprises a pair of holding rings which are fitted in the pair of grooves, respectively.

4. The device according to claim 2 ,
wherein an inner passage is formed in at least one of the plurality of pistons and/or at least one of the plurality of drive rods to supply working fluid from the working chamber to a contact surface of the contact part with the eccentric cam.

5. The device according to claim 1 ,
wherein the holding member comprises a cylindrical part surrounding the main part and an outward flange part provided at the radially inwards end of the cylindrical part, and
wherein the at least one holding ring holds the outward flange part of the holding member.

6. The device according to claim 5 , wherein the outward flange part of the holding member comprises a groove, and
wherein the at least one holding ring is fitted within the groove.

7. The device according to claim 6 ,
wherein the holding member comprises a pair of grooves on both sides of the cylindrical part, and
wherein the fluid working machine comprises a pair of holding rings which are fitted in the pair of grooves, respectively.

8. The device according to claim 6 ,
wherein an inner passage is formed in at least one of the plurality of pistons and/or at least one of the plurality of drive rods to supply working fluid from the working chamber to a contact surface of the contact part with the eccentric cam.

9. The device according to claim 5 ,
wherein the holding member comprises a pair of grooves on both sides of the cylindrical part, and
wherein the fluid working machine comprises a pair of holding rings which are fitted in the pair of grooves, respectively.

10. The device according to claim 5 ,
wherein an inner passage is formed in at least one of the plurality of pistons and/or at least one of the plurality of drive rods to supply working fluid from the working chamber to a contact surface of the contact part with the eccentric cam.

11. The device according to claim 1 ,
wherein the holding member comprises a pair of grooves on both sides of the cylindrical part, and
wherein the fluid working machine comprises a pair of holding rings which are fitted in the pair of grooves, respectively.

12. The device according to claim 11 ,
wherein an inner passage is formed in at least one of the plurality of pistons and/or at least one of the plurality of drive rods to supply working fluid from the working chamber to a contact surface of the contact part with the eccentric cam.

13. The device according to claim 1 ,
wherein an inner passage is formed in at least one of the plurality of pistons and/or at least one of the plurality of drive rods to supply working fluid from the working chamber to a contact surface of the contact part with the eccentric cam.

14. The device according to claim 13 ,
wherein an orifice is provided in said inner passage to regulate a flow of the working fluid.

15. The device according to claim 1 ,
wherein a surface of at least one of the plurality of drive rods facing the eccentric cam includes a recessed portion which is surrounded by a stepped boundary around an opening of the inner passage and which is configured to function as a working fluid sump, the stepped boundary separating the recessed portion from the contact surface.

16. The device according to claim 15 ,
wherein the working fluid sump is formed so that a depth of the working fluid sump changes in a stepped manner in a circumferential direction of the eccentric cam.

17. The device according to claim 1 ,
wherein a surface of at least one of the plurality of drive rods facing the eccentric cam includes a groove to which the inner passage opens and which is configured to function as a working fluid sump.

18. The device according to claim 1 ,
wherein at least one of the plurality of pistons is fixedly coupled to a respective one of the plurality of drive rods and has a cylinder-engaging piston ring.

19. The device according to claim 1 ,
wherein there is a gap between the holding member and the respective contact part during normal operation.

20. The device according to claim 1 ,
wherein the holding member comprises a cylindrical part surrounding the main part and an outward flange part provided at the radially inwards end of the cylindrical part, and
wherein the at least one holding ring holds the outward flange part of the holding member.

Assignees

• Artemis Intelligent Power Ltd
• Danfoss Power Solutions Aps
• Artemis Intelligent Power Ltd

Inventors

• Lavender Jack
• Voller Gordon

Classifications

• F01B1/0658

  Arrangements for pressing or connecting the pistons against the actuating or actuated cam · CPC title

• F04B1/0413 Primary

  Cams · CPC title

• F04B1/053

  with actuating or actuated elements at the inner ends of the cylinders · CPC title

• F03C1/0409

  Cams · CPC title

• F04B1/0426 Primary

  Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam · CPC title