AUTO-TENSIONER FOR ACCESSORIES - NTN TOYO BEARING CO LTD

Title:

AUTO-TENSIONER FOR ACCESSORIES

Document Type and Number:

WIPO Patent Application WO/2005/071288

Kind Code:

A1

Abstract:

An auto-tensioner for accessories, having excellent response to elongation and contraction of a belt and capable of maintaining amplitude of the belt small. A spring force of a return spring (21) is applied to a rod (16) slidably penetrating a seal member (13) installed at the upper opening of a cylinder (11), providing the rod (16) with ability to protrude outward. A plunger (24) slidable inside a bottomed sleeve (12) fitted in the cylinder (11) is connected to the lower part of the rod (16). A plunger (24) has a path (27) communicating a pressure chamber (25) below the plunger (24) and a reservoir chamber (26) above the plunger (24), and a check valve (28) is provided in the path (27). A return chamber (29) communicating with the reservoir chamber (26) is provided below the bottomed sleeve (12), a valve hole (31) communicating the return chamber (29) and the pressure chamber (25) is provided in the bottom of the sleeve (12), and a relief valve (32) is provided in the valve hole (31). The relief valve (32) prevents the pressure in the pressure chamber (25) from becoming higher than a set value, preventing the belt from being over-tensed to enable a leakage gap formed between sliding surfaces of the sleeve (12) and the plunger (24) to be set smaller. As a result, amplitude of the belt can be maintained small and response to elongation of the belt is improved with the relief valve (32) opened.

Inventors:

MINENO KATSUNORI (JP)
TANAKA TADAHISA (JP)
RYONO YOSHIAKI (JP)

Application Number:

PCT/JP2005/000965

Publication Date:

August 04, 2005

Filing Date:

January 26, 2005

Export Citation:

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Assignee:

NTN TOYO BEARING CO LTD (JP)
MINENO KATSUNORI (JP)
TANAKA TADAHISA (JP)
RYONO YOSHIAKI (JP)

International Classes:

F16H7/12; F16H7/08; (IPC1-7): F16H7/12

Foreign References:

JPH0510849U	1993-02-12
JP2001146946A	2001-05-29
JPH0510849U	1993-02-12

Other References: