Transmission filter with laser welded housing components

Details Transmission filter with laser welded housing components Transmission filter with laser welded housing components

2000-12-01

2002-08-13

Barry, Chester T. (Department: 1724)

Liquid purification or separation

Casing divided by membrane into sections having inlet

C210S321720, C210S321750, C210S321840

Reexamination Certificate

active

06432307

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the field of transmission filters and the manufacture thereof. In particular, the invention is concerned with a preferred transmission filter having a first flange transparent to a laser beam and a second flange opaque to the laser beam and meltable upon exposure thereto. The flanges are in registered, abutting relationship with a laser weld bead at the juncture between the flanges to provide a fluid seal circumscribing the filter.
2. Description of the Prior Art
A prior art fluid filter, such as an oil or transmission filter for a vehicle, includes first and second housing sections each presenting a circumscribing flange composed of synthetic resin material with the housing sections defining a chamber containing filter media. One of the flanges presents an upstanding weld rib that engages the surface of the other flange at a juncture. To join the flanges during manufacture, the flanges are vibration welded by vibrating one of the flanges at a high frequency. This creates heat at the juncture to create a weld bead circumscribing the filter and providing a fluid seal. The edges of the filter media are crimped between the flanges inboard of the weld bead to provide an additional fluid seal.
One of the problems with the prior art is that the edges of the filter media cannot be crimped as tightly as desired because to do so might result in damage to the edges during the vibration welding process. Another problem is that vibration welding process may not allow production rates as high as desired.
SUMMARY OF THE INVENTION
The present invention solves the prior art problems discussed above and provides a distinct advance in the state of the art. In particular, the fluid filter, manufacturing apparatus and method hereof enable increased manufacturing rates and provide a higher quality fluid seal.
The preferred fluid filter includes first and second housing sections forming an interior chamber with filter media received therein. The housing sections include respective first and second circumscribing flanges composed of synthetic resin material with the first flange composed of material transmissive to laser light and the second flange opaque to laser light and meltable upon exposure thereto. The flanges are in a registered, abutting relationship at a circumscribing juncture. A laser weld bead at the juncture couples the flanges to provide a fluid seal circumscribing the filter.
The preferred filter manufacturing apparatus includes a robot arm, a programmable processor coupled with the arm to control the movement thereof, a laser coupled with the robot arm operable to emit a laser beam, and a fixture to hold the components of the preferred fluid filter. The processor includes programming to operate the robot arm in a manner to direct the laser beam through the first flange onto the second flange along a path circumscribing the filter at the juncture in order to form the laser weld bead thereat in accordance with the preferred method of the present invention.


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