Pump device for a brake system with a reluctance drive

• US 10,683,857 B2
• Filed: 04/18/2016
• Issued: 06/16/2020
• Est. Priority Date: 05/27/2015
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Escher, Guenter, Stransky, Gerhard, Ferguson, Ben, Kratzer, Dietmar, Mayer, Franz, Specker, Michael, Achilles, Stefan, Lutz, Bernd, Schacherl, Alice, Paweletz, Anton, Bamberger, Hermann, Heller, Roland
• Primary Examiner(s): Hamo, Patrick
• Assistant Examiner(s): Jariwala, Chirag
• Application Number:
  US15/576,952
• Publication Number:
  US 20180149151A1
• Time in Patent Office: 1,520 Days
• CPC Class Codes: B60T 13/16 using pumps directly, i.e. without interposition of accumulators or reservoirs
• CPC Class Codes: F04B 13/02 of two or more fluids at the same time
• CPC Class Codes: F04B 17/042 the solenoid motor being separated from the fluid flow
• CPC Class Codes: F04B 25/02 of stepped piston type
• CPC Class Codes: F04B 49/06 Control using electricity regulating by means of floats actuating electric switches F04B49/04
• CPC Class Codes: F04B 5/02 with double-acting pistons
• CPC Class Codes: F04B 53/14 Pistons, piston-rods or piston-rod connections
• CPC Class Codes: H02K 33/02 with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs

Abstract

A pump device, in particular for a brake system of a motor vehicle, includes two hydraulic chambers, a linear drive, and a pump piston. Each of the chambers has at least two fluid connections. The pump piston interacts with the chambers. The linear drive is embodied as a reluctance drive and includes a longitudinally movable armature, a housing-fastened stator that is configured to receive current, and at least one spring element. The at least one spring element is associated with the armature, and is configured to counteract a drive force of the reluctance drive. The armature is connected to the pump piston.

Claims

1. A pump device, comprising:

a housing;

a pump piston;

two hydraulic chambers that each include at least two fluid connections, and that are configured to cooperate with the pump piston;

a linear drive embodied as a reluctance drive, and including;

a longitudinally movable armature connected to the pump piston;

a stator secured to the housing and configured to receive an applied current; and

at least one resilient element associated with the armature, and configured to counteract a drive force of the reluctance drive,

wherein the stator defines a first cylindrical face having a first axial length in a region of an air gap between the stator and the armature,

wherein the armature defines a second cylindrical face having a second axial length in the region of the air gap,

wherein the first axial length is equal to the second axial length,

wherein the armature defines a neutral position relative to the stator in which (i) electrical current is applied to the stator and a resultant axial force is zero, and (ii) the armature and the stator are arranged at the same height with the first cylindrical face fully axially aligned with the second cylindrical face, and

wherein the at least one resilient element is configured to urge the armature out of the neutral position.

2. The pump device as claimed in claim 1, wherein at least one of the two hydraulic chambers and the at least two fluid connections of at least one of the two hydraulic chambers are located in the pump housing of the pump device.

3. The pump device as claimed in claim 1, further comprising:

an insertion component positioned in the pump housing;

wherein at least one of the two hydraulic chambers and the at least two fluid connections of at least one of the two hydraulic chambers are located in the insertion component of the pump device.

4. The pump device as claimed in claim 1, further comprising:

a valve device associated with at least one of the at least two fluid connections of at least one of the two hydraulic chambers.

5. The pump device as claimed in claim 4, wherein the valve device is a non-return valve.

6. The pump device as claimed in claim 1, wherein the pump piston is a dual piston which has two pistons that are each associated with a respective one of the two hydraulic chambers.

7. The pump device as claimed in claim 6, wherein the dual piston is a stepped piston.

8. The pump device as claimed in claim 6, wherein the two pistons and the two hydraulic chambers are arranged in parallel beside each other.

9. The pump device as claimed in claim 6, wherein the two pistons are mechanically connected to the armature.

10. The pump device as claimed in claim 6, wherein the two pistons are hydraulically connected to the armature.

11. The pump device as claimed in claim 6, wherein the two pistons and the two hydraulic chambers are arranged in series along a movement direction of the two pistons.

13. The pump device as claimed in claim 1, wherein the pump device is a pump device for a brake system of a motor vehicle.

12. A brake system, comprising:

a pump device that includes;

a housing;

a pump piston;

two hydraulic chambers that each include at least two fluid connections, and that are configured to cooperate with the pump piston; and

a linear drive embodied as a reluctance drive, and having;

a longitudinally movable armature connected to the pump piston;

a stator secured to the housing and configured to receive an applied current; and

at least one resilient element associated with the armature, and configured to counteract a drive force of the reluctance drive; and

at least one hydraulic circuit hydraulically connected to the pump device and that, in each case, has at least one hydraulically actuatable wheel brake,

wherein the stator defines a first cylindrical face having a first axial length in a region of an air gap between the stator and the armature,

wherein the armature defines a second cylindrical face having a second axial length in the region of the air gap,

wherein the first axial length is equal to the second axial length,

wherein the armature defines a neutral position relative to the stator in which (i) electrical current is applied to the stator and a resultant axial force is zero, and (ii) the armature and the stator are arranged at the same height with the first cylindrical face fully axially aligned with the second cylindrical face, and

wherein the at least one resilient element is configured to urge the armature out of the neutral position.