LINEAR DRIVE AND PISTON PUMP ARRANGEMENT

• US 20140161650A1
• Filed: 12/05/2013
• Published: 06/12/2014
• Est. Priority Date: 12/06/2012
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Paweletz, Anton, Knoop, Michael, Kratzer, Dietmar, Gosse, Daniel
• Granted Patent: US 9,614,424 B2
• Time in Patent Office: Days
• US Class Current: 417/415
• CPC Class Codes: F04B 17/03 driven by electric motors
• CPC Class Codes: F04B 17/042 the solenoid motor being separated from the fluid flow
• CPC Class Codes: H02K 33/12 with armatures moving in alternate directions by alternate energisation of two coil systems
• CPC Class Codes: H02K 41/03 Synchronous motors; Motors moving step by step; Reluctance motors H02K41/035 takes precedence

Abstract

A linear drive, in particular for a piston pump, includes a first electromagnetic drive device, a second electromagnetic drive device, and a drive piston configured to be moved in an axial direction by the drive devices. The first drive device and the second drive device are each in the form of a reluctance drive device. The reluctance drive devices each have a stator with a stator coil that engages around the drive piston in a circumferential direction. The reluctance drive devices each also have a coil core with a coil receptacle, open in a radial direction toward the drive piston, for the coil winding. A piston pump arrangement includes the linear drive.

Claims

1. A linear drive, comprising:

a first electromagnetic drive device;

a second electromagnetic drive device; and

a drive piston configured to be moved in an axial direction by the drive device,

wherein the first drive device and the second drive device are each in the form of a reluctance drive device, and

wherein each of the reluctance drive devices has (i) a stator with a coil winding, the coil winding engaging around the drive piston in a circumferential direction, and (ii) a coil core which has a coil receptacle, open in a radial direction toward the drive piston, for the coil winding.

2. The linear drive according to claim 1, wherein the coil receptacle is delimited in the axial direction by two free ends, which point in the radial direction toward the drive piston, of the coil core.

3. The linear drive according to claim 2, wherein each coil core is assigned an armature element arranged on the drive piston.

4. The linear drive according to claim 3, wherein the coil core has the same axial extent as the armature element assigned thereto.

5. The linear drive according to claim 3, wherein the armature element has two armature arms which, in the radial direction, face the free ends of the coil core.

6. The linear drive according to claim 5, wherein the two armature arms have the same dimensions in the axial direction as the free ends of the coil core.

7. The linear drive according to claim 3, wherein the armature elements have a greater spacing from one another in the axial direction than the coil cores.

8. The linear drive according to claim 3, wherein the armature elements are arranged relative to one another such that, when one of the armature elements is in a position of congruence with respect to the corresponding coil core, the respective other armature element is displaced out of its position of congruence.

9. The linear drive according to claim 1, further comprising a restoring spring element operatively connected to the drive piston.

11. The linear drive according to claim 1, wherein the linear drive is configured for a piston pump.

10. A piston pump arrangement, comprising:

a piston pump including a pump piston; and

a linear drive configured to actuate the pump piston, the linear drive including;

a first electromagnetic drive device;

a second electromagnetic drive device; and

a drive piston operatively connected to the pump piston, the drive piston being configured to be displaced in an axial direction by the drive devices,

wherein the first drive device and the second drive device are each in the form of a reluctance drive device, and

wherein each of the reluctance drive devices has (i) a stator with a coil winding, the coil winding engaging around the drive piston in a circumferential direction, and (ii) a coil core which has a coil receptacle, open in a radial direction toward the drive piston, for the coil winding.