# US 8,739,682 B2 · Pneumatic actuator

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- Number: US 8,739,682 B2
- Document ID: US8739682B2
- Status: Granted
- Kind: B2
- Application number: 13/626,695
- Filed: 2012-09-25
- Published: 2013-01-24
- Granted: 2014-06-03
- Earliest claimed: 2008-02-28
- Assignees: GM Global Technology Operations LLC
- Applicants: GM Global Technology Operations LLC
- Inventors: Bernd Dreyer; Joachim Schaefer; Erik Wiesinger
- Web page: https://patentgrep.com/patent/US8739682B2

## CPC

- B60R 21/34: Protecting non-occupants of a vehicle, e.g. pedestrians {(B60R19/02 takes precedence)}
- F15B 15/19: Pyrotechnical actuators
- F15B 15/261: {using positive interengagement, e.g. balls and grooves, for locking in the end positions}
- B60R 21/38: using means for lifting bonnets
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR

## Abstract

A pneumatic actuator is provided for an active hood and includes a cylinder and a piston, which is movable in the cylinder between a lower terminal position, in which the volume of a chamber delimited by piston and cylinder, which may be impinged using compressed gas, is minimal, and an upper terminal position, in which the volume of the chamber is maximal. The piston is lockable in the lower terminal position by a detent body engaging in first recesses of the cylinder and the piston. A slider is displaceable by impingement using the compressed gas out of an idle position, in which it fixes the detent body in the first recesses, into a triggering position, in which a second recess of the slider overlaps with one of the first recesses and is capable, together with a single one of the first recesses of accommodating the detent body.

## Claims

### Claim 1

A pyrotechnic actuator for an active hood, comprising
a container for a gas generator;
a cylinder incorporating a moving piston;
a compressed gas line that joins the container with the cylinder; and
a filter body that is arranged on the compressed gas line,
wherein the filter body is situated to deflect on its surface a gas stream passing through the compressed gas line.

### Claim 2 (depends on 1)

The pyrotechnic actuator according to claim 1, wherein the filter body crosses the compressed gas line.

### Claim 3 (depends on 2)

The pyrotechnic actuator according to claim 2, wherein the filter body that deflects the gas stream and the filter body crossing the compressed gas line are sections of the same filter body.

### Claim 4 (depends on 3)

The pyrotechnic actuator according to claim 3, wherein said same filter body is a hollow item, and an inner cavity of said same filter body forms a downstream section of the compressed gas line.

### Claim 5 (depends on 4)

The pyrotechnic actuator according to claim 4, wherein said same filter body is tubular, a first section of the tubular filter body facing towards an upstream section of the compressed gas line and a second section of the tubular filter body facing away from said upstream section.

### Claim 6 (depends on 1)

The pyrotechnic actuator according to claim 1, wherein at the filter body the gas stream is deflected at a right angle.

### Claim 7 (depends on 1)

The pyrotechnic actuator according to claim 1, wherein a plurality of upstream sections are aligned toward a plurality of sections of the filter body.

### Claim 8 (depends on 7)

The pyrotechnic actuator according to claim 7, wherein the sections of the filter body crossing the compressed gas line lie on one half of its periphery, and the sections that deflect the gas stream lie on a second half of the periphery.