Method for damping the torsion of a screw drive for an electromechanical brake booster, screw drive for an electromechanical brake booster, and electromechanical brake booster

Patent metadata

Field	Value
Publication number	US-9994206-B2
Application number	US-201514843366-A
Country	US
Kind code	B2
Filing date	Sep 2, 2015
Priority date	Sep 10, 2014
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

A screw drive for an electromechanical brake booster of a braking system of a motor vehicle includes: a threaded nut; and a threaded spindle engaged with the threaded nut. The threaded nut includes an outer section which is connectable to a drive unit for driving the threaded nut, and an inner section having a thread for accommodating the threaded spindle. The inner section and the outer section of the threaded nut are connected by a damping unit for damping the torsion of the threaded nut.

First claim

What is claimed is:

1. A screw drive for an electromechanical brake booster of a braking system of a motor vehicle, comprising:
a threaded nut; and
a threaded spindle engaged with the threaded nut, wherein the threaded nut includes (i) an outer section which is selectably connected to a drive unit for driving the threaded nut, and (ii) an inner section having a thread for accommodating the threaded spindle, and wherein the inner section and the outer section of the threaded nut are connected by a damping unit for damping a torsion of the threaded nut, the damping unit being part of the threaded nut;
wherein a cavity is formed between the inner section and the outer section of the threaded nut, and wherein the damping unit is (i) situated in the cavity and (ii) elastically deformable by a force applied by the threaded spindle on the inner section of the threaded nut; and
wherein the damping unit is formed by a plurality of meander-shaped webs, each of the webs connecting the inner section to the outer section, and the threaded nut including the damping unit is a one-piece injection molded part.

2. The screw drive as recited in claim 1 , wherein the thread of the inner section of the threaded nut is one of a trapezoidal thread or a ball screw thread.

3. An electromechanical brake booster of a braking system of a motor vehicle, comprising:
a screw drive including:
a threaded nut; and
a threaded spindle engaged with the threaded nut, wherein the threaded nut includes (i) an outer section and (ii) an inner section having a thread for accommodating the threaded spindle, and wherein the inner section and the outer section of the threaded nut are connected by a damping unit for damping a torsion of the threaded nut, the damping unit being a part of the threaded nut;
wherein a cavity is formed between the inner section and the outer section of the threaded nut, and wherein the damping unit is (i) situated in the cavity and (ii) elastically deformable by a force applied by the threaded spindle on the inner section of the threaded nut; and
wherein the damping unit is formed by a plurality of meander-shaped webs, each of the webs connecting the inner section to the outer section, and the threaded nut including the damping unit is a one-piece injection molded part; and

a drive unit for driving the screw drive, wherein the drive unit includes a gear wheel connected to an electric motor which engages with the outer section of the threaded nut of the screw drive, the drive unit thereby being selectably connected to the outer section of the threaded nut for driving the threaded nut.

Assignees

• Bosch Gmbh Robert

Inventors

• Hatt Ignaz
• Guggenmos Harald
• Ferguson Ben
• Garnier Remy

Classifications

• F16H25/24 Primary

  Elements essential to such mechanisms, e.g. screws, nuts (F16H25/22 takes precedence) · CPC title

• F16F15/08

  with rubber springs {(grommet- or bushing-type resilient mountings F16F1/3732, F16F1/38); with springs made of rubber and metal (arrangement of internal-combustion or jet-propulsion units B60K5/12; mounting of propulsion plants on vessels B63H21/30; mounting of vehicle drivers' cabs B62D33/0604)} · CPC title

• B60T13/745

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

• B60T13/74 Primary

  with electrical assistance or drive · CPC title

• F16H2025/2081

  Parallel arrangement of drive motor to screw axis · CPC title