Pipe joints or couplings – Essential catch
Reexamination Certificate
1998-07-22
2001-01-30
Arola, Dave W. (Department: 3629)
Pipe joints or couplings
Essential catch
C285S420000, C285S906000, C285S038000
Reexamination Certificate
active
06179345
ABSTRACT:
FIELD OF THE INVENTION
The present invention concerns a device for connecting two tubular piping parts, and in particular, a device for connecting piping parts in a motor vehicle exhaust system.
RELATED TECHNOLOGY
A device for connecting two tubular piping parts of the generic type is known from German Patent Application No. 44 44 550 A1. The spring device for generating a pre-stress force between the two connector pieces has a curved washer which supports itself on one connector piece and another curved washer that is mechanically attached to the other connector piece. The two curved washers are pre-stressed against each other by clamps. The previously known device is relatively complicated in structure and in addition requires a relatively large additional space.
A similar device with which a motor vehicle engine exhaust system can also be decoupled from vibration generated by the engine is known from French Patent 2 360 028. In the French patent, a spiral spring which presses the two piping parts apart in the axial direction is stressed between the two connector pieces. This piping connection has the disadvantage that it inadequately decouples engine vibrations.
In German Patent Application No. 196 53 906.4, which is not necessarily prior art to the present application, a device is described for decoupling piping parts in the motor vehicle exhaust system in which a spring device with two spring branches is inserted into slots in a connector piece of a piping part and the spring branches are supported on part of an end section. However, this older device is also relatively complicated.
SUMMARY OF THE INVENTION
An object of the present invention is to create a device for connecting piping parts, in particular for use in a motor vehicle exhaust system. Decoupling of engine vibrations can be achieved in a simple and cost-effective manner using as little space as possible.
The present invention therefore provides a device for connecting two tubular piping parts, in particular piping parts in the motor vehicle exhaust system, the piping parts having connector pieces, between which a sealing device is mounted and the connector pieces being stressed against each other in axial direction by a spring device. The spring device contains a wire spring (
5
), which surrounds one of the two connector pieces (
1
a
,
2
,
3
a
,
3
c
) at least partially with two spring branches (
5
a
,
5
b
) and is supported by this connector piece (
3
a
,
3
c
) while it is stressed with the same spring branches (
5
a
,
5
b
) or another area of wire spring (
5
) against a stop on the other connector piece (
2
,
1
a
).
With the device according to the present invention, two exhaust pipes in a motor vehicle exhaust system can be connected in an optimum manner so that they are gas tight and the vibration generated in the exhaust system by the engine can be decoupled from the vehicle body.
In contrast to previous solutions, the device according to the present invention can achieve space requirement, manufacturing feasibility, cost and assembly goals. In particular, the spring device made from a wire spring, in particular from round wire, can be produced especially cost-effectively. In addition, this connection requires very little space with simultaneously very simple shaping at the pipe ends and/or simple design of the connector pieces.
Additional decoupling elements in the exhaust system can be omitted because of the connecting device according to the present invention, since the separating point between front part and rear part of the exhaust system can also take on the function of decoupling element in the usual manner. This both saves costs and decreases the exhaust system weight. Advantageous designs and further developments of the invention are described below.
REFERENCES:
patent: D. 135689 (1943-05-01), Rocic
patent: 2134858 (1938-11-01), Clark
patent: 2443272 (1948-06-01), Sagen
patent: 3314696 (1967-04-01), Ferguson et al.
patent: 4181332 (1980-01-01), Neumann
patent: 5000614 (1991-03-01), Walker
patent: 5433183 (1995-07-01), Vansnick
patent: 29 13 561 (1979-10-01), None
patent: 2913561 (1979-10-01), None
patent: 1142476 (1969-02-01), None
patent: 1 570 006 (1980-06-01), None
patent: 2 087 021 (1982-05-01), None
patent: 2 268 238 (1994-01-01), None
patent: 2 320 542 (1998-06-01), None
Gensert Heiko
Peters Arndt
Schneider Horst
Wierzba Helmut
Arola Dave W.
Daimler-Benz Aktiengesellschaft
Kenyon & Kenyon
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