Pump device for a brake system of a motor vehicle, brake system

Patent metadata

Field	Value
Publication number	US-11498539-B2
Application number	US-202016899912-A
Country	US
Kind code	B2
Filing date	Jun 12, 2020
Priority date	Jul 18, 2019
Publication date	Nov 15, 2022
Grant date	Nov 15, 2022

Abstract

A pump device for a brake system of a motor vehicle has a housing, a pressure piston which delimits a pressure chamber in the housing for producing hydraulic pressure mounted in the housing in a longitudinally displaceable manner, a return spring assigned to the pressure piston, a non-return valve which separates the pressure chamber from a pressure connection and only removes the separation when the hydraulic pressure in the pressure chamber is greater than in the pressure connection, and an electromagnetic actuator which includes an armature and an electrically energizable solenoid. The armature is arranged on the pressure piston and the solenoid in and/or on the housing. The pressure piston has an axial through-channel which opens out into the pressure chamber at one end and is assigned to the non-return valve at the other end.

First claim

The invention claimed is:

1. A pump device for a brake system of a motor vehicle, comprising:
a housing;
a pressure piston that defines a pressure chamber in the housing and is mounted in said housing in a longitudinally displaceable manner in such a way that a first hydraulic pressure in the pressure chamber is increased by a longitudinal movement of the pressure piston;
a return spring assigned to the pressure piston;
a non-return valve configured to hydraulically separate the pressure chamber from a pressure connection and to allow flow between the pressure chamber and the pressure connection only when the first hydraulic pressure in the pressure chamber is greater than a second hydraulic pressure in the pressure connection; and
an electromagnetic actuator comprising an armature and an electrically energizable solenoid, the armature arranged on the pressure piston and the solenoid is arranged in and/or on the housing,
wherein the pressure piston defines an axial through-channel having a first end and a second end, the axial through-channel opens out into the pressure chamber at the first end and is assigned to the non-return valve at the second end, and
wherein the pressure piston has a pressure piston casing wall that defines at least one radial opening assigned to an intake connection and that, in at least one slide position of the pressure piston, hydraulically connects the intake connection to the pressure chamber, the radial opening being hydraulically connected to the intake connection in all slide positions of the pressure piston.

2. The pump device according to claim 1 , wherein:
the pressure piston has a first front side assigned to the pressure chamber and a second front side assigned to the non-return valve, and
a first cross-sectional area of the first front side is greater than a second cross-sectional area of the second front side.

3. The pump device according to claim 2 , wherein:
the housing includes a closed front surface that defines the pressure chamber, and
the return spring is held in a preloaded state between the first front side and the closed front surface of the housing.

4. The pump device according to claim 1 , wherein the pressure piston includes an inlet valve that connects the intake connection to the pressure chamber, the inlet valve comprising a valve sleeve that partially defines the axial through-channel and is mounted in the pressure piston in a longitudinally displaceable manner.

5. The pump device according to claim 4 , wherein the valve sleeve includes a valve sleeve casing wall that defines at least one axial channel which, in a first sliding position of the valve sleeve in the pressure piston, connects the at least one radial opening of the pressure piston to the pressure chamber and, in a second sliding position separates the at least one radial opening from the pressure chamber.

6. The pump device according to claim 5 , wherein:
an end of the valve sleeve facing toward the pressure chamber comprises an annular seal seat that rests against the pressure piston so as to close the at least one axial channel in the second sliding position, and
the axial channel is spaced apart from the pressure piston in a releasing manner in the first sliding position.

7. The pump device according to claim 5 , wherein the axial channel is configured as a groove-shaped depression in an outer side of a valve housing casing wall of the valve housing.

8. The pump device according to claim 5 , wherein the axial channel is defined by a circumferential groove in an outer side of the valve sleeve casing wall.

9. The pump device according to claim 1 , wherein the armature is slid axially onto the pressure piston.

10. The pump device according to claim 1 , wherein the armature is connected to the pressure piston in an axial direction in a form-fitting manner.

11. The pump device according to claim 10 , wherein the armature is connected to the pressure piston in the axial direction by at least one caulking.

12. The pump device according to claim 1 , wherein the housing is configured as a plug-in housing configured to plug into a hydraulic block of the brake system, the housing including at least one radial projection on an outside of the housing that is configured to axially secure the housing in the hydraulic block.

13. The pump device according to claim 12 , wherein the radial projection is configured to plastically deform the hydraulic block so as to secure the housing in the hydraulic block.

14. The pump device according to claim 1 , wherein the housing is of multipart design and comprises:
a first housing part in which the pressure piston and the non-return valve are received and mounted; and
a second housing part that closes the pressure chamber,
wherein the first and second housing parts are fixedly connected to one another.

15. The pump device according to claim 14 , wherein the armature is displaceably mounted in the second housing part.

16. The pump device according to claim 14 , wherein the first and second housing parts are permanently connected to one another by plastic deformation.

17. The pump device according to claim 16 , wherein the first and second housing parts are permanently connected to one another by caulking.

18. A brake system for a motor vehicle comprising:
at least one brake circuit comprising at least one hydraulically actuable wheel brake; and
at least one pump device configured to generate hydraulic pressure in the at least one brake circuit, the at least one pump device comprising:
a housing;
a pressure piston that defines a pressure chamber in the housing and is mounted in said housing in a longitudinally displaceable manner in such a way that a first hydraulic pressure in the pressure chamber is increased by a longitudinal movement of the pressure piston;
a return spring assigned to the pressure piston;
a non-return valve configured to hydraulically separate the pressure chamber from a pressure connection and to allow flow between the pressure chamber and the pressure connection only when the first hydraulic pressure in the pressure chamber is greater than a second hydraulic pressure in the pressure connection; and
an electromagnetic actuator comprising an armature and an electrically energizable solenoid, the armature arranged on the pressure piston and the solenoid is arranged in and/or on the housing,
wherein the pressure piston defines an axial through-channel having a first end and a second end, the axial through-channel opens out into the pressure chamber at the first end and is assigned to the non-return valve at the second end, and
wherein the pressure piston has a pressure piston casing wall that defines at least one radial opening assigned to an intake connection and that, in at least one slide position of the pressure piston, hydraulically connects the intake connection to the pressure chamber, the radial opening being hydraulically connected to the intake connection in all slide positions of the pressure piston.

19. A pump device for a brake system of a motor vehicle, comprising:
a housing;
a pressure piston that defines a pressure chamber in the housing and is configured to produce hydraulic pressure, the pressure piston mounted in said housing in a longitudinally displaceable manner;
a return spring assigned to the pressure piston;
a non-return valve configured to hydraulically separate the pressure chamber from a pressure connection and to allow flow between the pressure chamber and the pressure connection only when a first hydraulic pressure

Assignees

• Bosch Gmbh Robert

Inventors

• Keyl Christoph

Classifications

• F04B17/04

  using solenoids · CPC title

• B60T13/16 Primary

  using pumps directly, i.e. without interposition of accumulators or reservoirs · CPC title

• F04B53/121

  the valve being an annular ring surrounding the piston, e.g. an O-ring · CPC title

• F04B53/148

  the piston being provided with channels which are coacting with the cylinder and are used as a distribution member for another piston-cylinder unit · CPC title

• F04B53/10

  Valves; Arrangement of valves · CPC title