# US 9,096,191 B2 · Belt tensioner for a safety belt system

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- Number: US 9,096,191 B2
- Document ID: US9096191B2
- Status: Granted
- Kind: B2
- Application number: 14/352,076
- Filed: 2012-10-22
- Published: 2015-01-29
- Granted: 2015-08-04
- Earliest claimed: 2011-10-27
- Assignees: TRW Automotive GmbH
- Applicants: TRW Automotive GmbH
- Inventors: Hans-Peter Betz; Dominik Seitzer; Karl Ruediger
- Web page: https://patentgrep.com/patent/US9096191B2

## CPC

- B60R 22/195: with means to tension the belt in an emergency, {e.g. means of the through-anchor or splitted reel type}(electrical circuits for triggering safety arrangements {B60R21/01})
- B60R 22/1952: {Transmission of tensioning power by cable; Return motion locking means therefor}
- B60R 22/1955: {Linear actuators}
- B60R 22/46: {Reels} with means to tension the belt in an emergency {by forced winding up}(electrical circuits for triggering safety arrangements B60R21/01 {; tensioners using reels only guiding the belt during normal use, e.g. splitted reels B60R22/195})
- B60R 22/4619: {Transmission of tensioning power by cable, e.g. using a clutch on reel side}
- B60R 22/4633: {Linear actuators, e.g. comprising a piston moving along reel axis and rotating along its own axis}
- B60R 2022/4695: {without winding function during normal use}
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR

## Abstract

The invention relates a belt tensioner (10) for a seat belt system comprising a tensioner tube (42) for receiving and guiding a pressurizing element (44) as well as a separate generator housing (46) for receiving a gas generator (48), wherein a coupling element (50) tightly connecting the generator housing (46) to the tensioner tube (42) is provided.

## Claims

### Claim 1

A belt tensioner for a seat belt system, comprising
a tensioner tube (42) for receiving and guiding a pressurizing element (44) as well as
a separate generator housing (46) for receiving a gas generator (48),
wherein a coupling element (50) extends both into the generator housing (46) and into the tensioner tube (42) for tightly connecting the generator housing (46) to the tensioner tube (42).

### Claim 2 (depends on 1)

The belt tensioner according to claim 1, wherein the generator housing (46) is a tube length.

### Claim 3 (depends on 1)

The belt tensioner according to claim 1, wherein the coupling element (50) is made of plastic material.

### Claim 4 (depends on 1)

The belt tensioner according to claim 1, wherein the coupling element (50) includes a flow passage (56) which communicates a pressure chamber (58) of the generator housing (46) to a pressure chamber (60) of the tensioner tube (42).

### Claim 5 (depends on 1)

The belt tensioner according to claim 1, wherein a pull rope (41) extending through a rope guiding passage (54) formed in the coupling element (50) is provided.

### Claim 6 (depends on 1)

The belt tensioner according to claim 1, wherein the belt tensioner (10) is an end fitting tensioner, comprising a belt shaft (12) to which one end (14) of a webbing (16) is fixed and a belt shaft housing (18) in which the belt shaft (12) is supported, wherein upon activation of the belt tensioner (10) the belt shaft (12) can be rotated relative to the belt shaft housing (18) so as to wind up webbing (16).

### Claim 7 (depends on 1)

The belt tensioner according to claim 1, wherein the coupling element (50) and at least one of the tensioner tube (42) and the generator housing (46) each includes a circumferential bead (52) for tightly connecting the generator housing (46) to the tensioner tube (42).

### Claim 8

A belt tensioner for a seat belt system, comprising:
a tensioner tube (42) for receiving and guiding a pressurizing element (44) as well as
a separate generator housing (46) for receiving a gas generator (48),
wherein a coupling element (50) is provided for tightly connecting the generator housing (46) to the tensioner tube (42) with the generator housing (46) and the tensioner tube (42) enclosing substantially the entire coupling element (50).

### Claim 9

A belt tensioner for a seat belt system, comprising:
a tensioner tube (42) for receiving and guiding a pressurizing element (44) as well as
a separate generator housing (46) for receiving a gas generator (48),
wherein a coupling element (50) is pressed with the generator housing (46) and/or with the tensioner tube (42) for tightly connecting the generator housing (46) to the tensioner tube (42).

### Claim 10

A belt tensioner for a seat belt system, comprising:
a tensioner tube (42) for receiving and guiding a pressurizing element (44) as well as
a separate generator housing (46) for receiving a gas generator (48),
a coupling element (50) for tightly connecting the generator housing (46) to the tensioner tube (42), and
a stabilizing unit (64) which fixes the connection between the generator housing (46) and the tensioner tube (42).