Endless belt power transmission systems or components – Means for adjusting belt tension or for shifting belt,... – Tension adjuster or shifter driven by electrical or fluid motor
Reexamination Certificate
2006-05-02
2006-05-02
Johnson, Vicky A. (Department: 3682)
Endless belt power transmission systems or components
Means for adjusting belt tension or for shifting belt,...
Tension adjuster or shifter driven by electrical or fluid motor
C474S101000
Reexamination Certificate
active
07037229
ABSTRACT:
A hydraulic tensioner includes a cylinder having a hollow space filled with hydraulic oil. A plunger is slidably mounted in the cylinder. A pushrod is mounted in the hollow space so as to be axially movable together with the plunger with one end thereof protruding from the cylinder. A spring is mounted in the cylinder to bias the plunger and pushrod outwardly of the cylinder. The plunger is formed with a passage through which a pressure chamber and reservoir chamber communicate with each other. The passage is formed with a valve seat. A check ball is arranged so as to be moved into and out of contact with the valve seat. The check ball is adapted to contact the valve seat when pressure in the pressure chamber exceeds pressure in the reservoir chamber, thereby closing the passage. The valve seat is formed of a steel for carburizing and has a surface carbon concentration of 0.55–0.75% to reduce deposition of carbides and to have a surface hardness at least equal to that of the check ball.
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patent: 6176946 (2001-01-01), Kuehmann et al.
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patent: 2002030338 (2002-01-01), None
patent: 2002-357250 (2002-12-01), None
Hayakawa Hisashi
Izutsu Tomoyoshi
Kitano Satoshi
Komori Kazuo
Johnson Vicky A.
NTN Corporation
Wenderoth , Lind & Ponack, L.L.P.
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