US 6,440,021 B2Granted

Tensioner for applying tension to force transmitting member

AssigneeNHK Spring Co., Ltd.

InventorsNoritoshi Takamura, Tomokazu Kaibuki

Life of this patent

Estimating the term…

Loading patent…

Abstract

This tensioner comprises a casing, a first shaft member rotatably stored in the casing so as to be restrained from moving in its axial direction, a second shaft member in screwed engagement with the first shaft member, and a spring for applying a turning force to the first shaft member. The second shaft member is restrained from rotating relatively to the casing and allowed to move in the axial direction. An axial load from a force transmitting member, such as a chain or belt, acts on the first shaft member. An end face of the first shaft member touches a receiving surface of the casing across a washer. The end face receives the axial load that acts on the second shaft member. The flatness of at least the end face of the first shaft member is adjusted to 15 μm or less.

Claims11

Dependent claims

A tensioner for applying tension to a force transmitting member, comprising:

a casing;
a first shaft member rotatably stored in said casing so as to be restrained from moving along an axis;
a second shaft member in screwed engagement with said first shaft member, movable in the direction of the axis, restrained from rotating relatively to said casing, and subjected to a load in the direction of the axis from the force transmitting member;
and
a spring stored in said casing and capable of applying turning force to said first shaft member,
wherein a slit extending in the diametrical direction of said first shaft member is formed in an end face of said first shaft member, said end face touching a receiving surface of said casing directly or across a washer and receiving said load acting on said second shaft member, the flatness of the end face of said first shaft member ranging from 1.5 μm to 15 μm.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/970,510Filed 4 Oct 2001 · continuation
Priority: JP 11-10729814 Apr 1999
Published: US 2002/0019281 A114 Feb 2002
Granted: 27 Aug 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

F16H 7/08
Gearings for conveying rotary motion by endless flexible members: means for varying tension of belts, ropes or chains
F16H 2007/081
Actuators for final output members: torsion springs
F16H 2007/0891
Path of movement of the finally actuated member: linear path
F16H
Gearing