Hydraulic actuator

Patent metadata

Field	Value
Publication number	US-11149763-B2
Application number	US-201916290506-A
Country	US
Kind code	B2
Filing date	Mar 1, 2019
Priority date	Mar 6, 2018
Publication date	Oct 19, 2021
Grant date	Oct 19, 2021

Abstract

A hydraulic actuator includes a cylinder, a pump, an electric motor and a central block. The mechanism or the rotating parts of the pump are directly installed in an interior of the block, and the drive shaft of the pump is correspondingly mounted in walls or in covers of the block.

First claim

The invention claimed is:

1. A hydraulic actuator comprising:
a cylinder including a movable piston having a first piston rod;
a pump configured to supply the cylinder, the pump including a cylinder barrel;
an electric motor that drives the pump; and
a hydraulic control block, in or on which connections for the pump and the cylinder are formed and which defines channels that interconnect the connections, the hydraulic control block comprising:
a main body defining an interior space, the main body surrounding a portion of the first piston rod; and
a first cover having a first side exposed to an exterior of the hydraulic control block and a second side that, along with the main body, defines the interior space in such a way that the first cover closes the interior space,

wherein the pump is arranged in the interior space in such a way that the cylinder barrel is exposed to the interior space,
wherein the pump is an axial piston pump having a swash plate design, the pump having a drive shaft that penetrates into the interior space and is mounted in the control block by a respective bearing on each side of the interior space,
wherein the first cover includes a distribution baffle of the axial piston pump, which includes two kidney-shaped openings defined in the second side of the first cover, and
wherein the first cover defines two orifices in the second side of the first cover that connect to the main body and two curved working-channels, each of which curves from a respective one of the two kidney-shaped openings to a respective one of the two orifices so as to connect the respective kidney-shaped opening to the respective orifice.

2. The actuator according to claim 1 , wherein the hydraulic control block defines a through-opening that is coaxial with the drive shaft and through which the drive shaft is connected to the electric motor or to a coupling, by means of which the electric motor is configured to be coupled to the pump.

3. The actuator according to claim 2 , wherein the hydraulic control block further comprises a second cover defining the interior space and closing the interior space at an opposite end from the first cover.

4. The actuator according to claim 3 , wherein the through-opening is defined in the second cover.

5. The actuator according to claim 4 , wherein the second cover comprises a mounting face, to which the electric motor or a support for the electric motor is attached.

6. The actuator according to claim 3 , further comprising:
a storage device attached to the first cover,
wherein a storage channel is defined penetrating the first cover so as to connect the storage device to the main body.

7. The actuator according to claim 1 , further comprising:
a cooling line arranged in the interior space and at least partially surrounding the cylinder barrel; and
a connection for the cooling line arranged on the first cover.

8. The actuator according to claim 1 , wherein:
one of the respective bearings is inserted in the first cover.

9. The actuator according to claim 1 , wherein the first cover is formed from cast material.

10. The actuator according to claim 1 , wherein the two working channels are formed in the first cover by 3D-printed sand cores.

11. The actuator according to claim 1 , wherein the housing control block defines a leakage connection connecting the exterior to the interior space at a side of the drive shaft of the pump.

12. The actuator according to claim 1 , wherein the main body of the hydraulic control block defines an inner wall of the cylinder.

13. The actuator according to claim 1 , wherein the cylinder includes a second piston rod, which is configured to be moved out of the hydraulic control block and, when moved out of the hydraulic control block, the second piston rod extends parallel to the electric motor.

14. The actuator according to claim 1 , wherein the electric motor and the first piston rod are arranged so as to be mutually parallel on a first side of the hydraulic control block that is opposite the first cover, and wherein a position measuring system is arranged on a second side of the hydraulic control block, which is opposite the first side.

15. The actuator according to claim 1 , wherein the first piston rod protrudes from a first side of the hydraulic control block, and wherein the electric motor and the cylinder are arranged on a second side of the hydraulic control block which is opposite the first side.

16. The actuator according to claim 1 , wherein the curved working channels extend from the respective one of the two orifices to the respective one of the two kidney-shaped channels without any edges.

Assignees

• Bosch Gmbh Robert

Inventors

• Markert Christian
• Hanauer Emil
• Schwacke Johannes
• Stefanjuk Oleg

Classifications

• F15B15/18 Primary

  Combined units comprising both motor and pump · CPC title

• F04B53/08

  Cooling; Heating; Preventing freezing · CPC title

• F04B17/03

  driven by electric motors · CPC title

• F04B1/22

  having two or more sets of cylinders or pistons · CPC title

• F04B1/2042 Primary

  Valves · CPC title