Hydraulic power unit for a hydraulic vehicle braking system

Patent metadata

Field	Value
Publication number	US-2021206363-A1
Application number	US-201917272165-A
Country	US
Kind code	A1
Filing date	Sep 18, 2019
Priority date	Oct 4, 2018
Publication date	Jul 8, 2021
Grant date	—

Abstract

A piston of a hydraulic power unit of a hydraulic power vehicle braking system including slip control is guided directly, without a cylinder liner, in a cylinder bore of a hydraulic block. The piston is rotatably fixedly and axially displaceably held in a bushing with the aid of an anti-rotation mechanism, which in turn is rotatably fixed at the hydraulic block. A pivot bearing of a worm gear for displacing the piston is fixed at the bushing.

First claim

1 - 12 . (canceled)

13 . A hydraulic power unit for a hydraulic vehicle braking system, comprising:
a hydraulic block which includes a cylinder bore in which a piston is axially displaceably guided; an electric motor situated at and/or in the hydraulic block; and a worm gear which is rotatably driveable by the electric motor and which converts a rotary motion of the electric motor into a displacement by which the piston is axially displaceable in the cylinder bore; wherein the piston is axially displaceably guided directly in the cylinder bore of the hydraulic block.

14 . The hydraulic power unit as recited in claim 13 , wherein the hydraulic power unit includes a piston seal, which seals between the piston and the cylinder bore.

15 . The hydraulic power unit as recited in claim 13 , wherein the cylinder bore is closed at a front face facing away from the electric motor by a wall of the hydraulic block.

16 . The hydraulic power unit as recited in claim 13 , wherein the hydraulic power unit includes a bushing which is open at both front faces and situated on a motor side of the hydraulic block, which is open into the cylinder bore and which is aligned coaxial to the cylinder bore at the hydraulic block.

17 . The hydraulic power unit as recited in claim 16 , wherein the bushing is rotatably fixed at the hydraulic block, and the bushing includes an anti-rotation mechanism for the piston.

18 . The hydraulic power unit as recited in claim 17 , wherein the bushing includes an axially parallel groove, in which a cylinder pin rests which holds the piston rotatably fixedly in the bushing by form fit, as the anti-rotation mechanism for the piston.

19 . The hydraulic power unit as recited in claim 17 , wherein the bushing protrudes into the cylinder bore of the hydraulic block, and includes an anti-rotation profile on its outside which effectuates a form fit against a rotation of the bushing with respect to the hydraulic block in the cylinder bore of the hydraulic block.

20 . The hydraulic power unit as recited in claim 16 , wherein the bushing is axially fixed at the hydraulic block, and the bushing includes a pivot bearing for the worm gear which axially holds the worm gear.

21 . The hydraulic power unit as recited in claim 20 , wherein the hydraulic power unit includes a radially resilient spring washer, which engages in a circumferential groove on an outside of the bushing and in a circumferential groove in the cylinder bore of the hydraulic block, and which axially fixes the bushing at the hydraulic block.

22 . The hydraulic power unit as recited in claim 16 , wherein the bushing includes an outwardly projecting axial stop which rests against the motor side of the hydraulic block.

23 . The hydraulic power unit as recited in claim 13 , wherein the hydraulic block includes a cylinder including a cylinder bore which protrudes on a side of the hydraulic block situated opposite the motor side and is a one-piece integral part of the hydraulic block.

24 . The hydraulic power unit as recited in claim 13 , wherein cylinder connection lines extending in the hydraulic block open directly into the cylinder bore in the hydraulic block.

Assignees

• Bosch Gmbh Robert

Inventors

• Weh Andreas
• Guggenmos Harald
• Hagspiel Martin
• Kaserer Stefan

Classifications

• F16D2200/0013

  Cast iron · CPC title

• B60T8/368

  combined with other mechanical components, e.g. pump units, master cylinders · CPC title

• B60T13/745 Primary

  acting on a hydraulic system, e.g. a master cylinder · CPC title

• F16D2250/0007

  Casting · CPC title

• B60Y2200/81

  Toys · CPC title