Preloaded piston valving for hydraulic dampers and method of ass

Details Preloaded piston valving for hydraulic dampers and method of ass Preloaded piston valving for hydraulic dampers and method of ass

1989-04-27

1990-11-20

Oberleitner, Robert J.

Brakes

Internal-resistance motion retarder

Valve structure or location

29436, 29446, 13754317, F16F 934, B23P 1100, F16K 1502

Patent

active

049711814

ABSTRACT:
A load cell exerts a force on a loose spring cage of a rebound spring to displace the cage and hold it in position on the piston of a hydraulic damper unit until it is welded in position. This preloads the rebound spring to close tolerance so that rebound valve operation is constant regardless of variation in spring sizes, rates and stack up heights of valve components.

REFERENCES:
patent: 3187847 (1965-06-01), Karlgaard
patent: 3621949 (1971-11-01), Watson
patent: 3724615 (1973-04-01), Stormer
patent: 3999274 (1976-12-01), Butler
patent: 4356898 (1982-11-01), Guzder et al.
patent: 4606440 (1986-08-01), Buchanan, Jr. et al.
patent: 4747475 (1988-05-01), Hagwood et al.

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