Piston and piston-rod guide unit for hydraulic shock absorbers

Details Piston and piston-rod guide unit for hydraulic shock absorbers Piston and piston-rod guide unit for hydraulic shock absorbers

1996-05-13

1998-11-24

Young, Lee W.

Brakes

Internal-resistance motion retarder

Including seal or guide

18832218, F16F 936

Patent

active

058395512

ABSTRACT:
In the piston and piston-rod guide unit for hydraulic shock absorbers the piston-rod guide (2) includes an annular piece (3) provided with a central orifice (5) for the piston rod and an elastic sealing ring (4), and the piston (1) is a body of revolution with a convex generatrix. The external surface of the piston is coated with an anti-friction piston coating (9) advantageously including polytetrafluoroethylene and having a uniform piston coating thickness. The central orifice (5) of the annular piece has an internal wall coated at least partially with a guide coating (6) having a uniform guide coating thickness equal to that of the piston coating (9) and a coating composition which is the same as that of the piston coating. These coatings (6,9) are between 20 to 60 micrometers thick and are charged with ceramic particles and a pigment in the polytetrafluoroethylene, in order to reduce friction and improve wear resistance.

REFERENCES:
patent: 3722640 (1973-03-01), Taylor
patent: 4442987 (1984-04-01), Legrand et al.
patent: 4445598 (1984-05-01), Brambilla
patent: 4497394 (1985-02-01), Ferrand et al.
patent: 4934667 (1990-06-01), Pees et al.
patent: 5364543 (1994-11-01), Bosna et al.

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