Pulley structure and method for manufacturing pulley structure

Patent metadata

Field	Value
Publication number	US-11274739-B2
Application number	US-201816499512-A
Country	US
Kind code	B2
Filing date	Mar 28, 2018
Priority date	Mar 30, 2017
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

A pulley structure may include: a tubular outer rotating body having a belt looped thereon; an inner rotating body which is disposed radially inside the outer rotating body and which is rotatable relative to the outer rotating body; and a torsional coil spring which is arranged in a spring accommodating space formed between the outer rotating body and the inner rotating body. At least in a state in which the pulley structure has not been operated even once, grease containing a rust inhibitor is applied to an opposing surface of the inner rotating body opposing an inner peripheral surface of the torsional coil spring.

First claim

The invention claimed is:

1. A pulley structure to be connected to an accessory machine of an engine and to which power of the engine is to be transmitted via a belt, the pulley structure comprising:
a cylindrical outer rotating body around which the belt is to be wound;
an inner rotating body provided radially inward on the outer rotating body and relatively rotatable with respect to the outer rotating body; and
a torsion coil spring disposed in a spring accommodation space formed between the outer rotating body and the inner rotating body,
wherein at least in a state where the pulley structure is not yet operated once, grease containing a rust inhibitor is applied to a facing surface of the inner rotating body, facing an inner circumferential surface of the torsion coil spring,
wherein the grease on the facing surface has a thickness of 0.8 mm or more and 2 mm or less.

2. The pulley structure according to claim 1 , wherein the grease has an area adhering to the facing surface which is 4% or more of the area of the facing surface.

3. The pulley structure according to claim 1 , wherein the grease is applied on the facing surface along a rotation axis direction of the inner rotating body.

4. The pulley structure according to claim 1 , wherein the grease is applied only to the facing surface of the inner rotating body among surfaces forming the spring accommodation space.

5. The pulley structure according to claim 1 , comprising a sliding bearing interposed between the inner rotating body and an end portion of the outer rotating body in a rotation axis direction.

6. The pulley structure according to claim 5 ,
wherein the sliding bearing is formed of a resin composition containing polytetramethylene adipamide as a base resin, and
the resin composition contains a reinforcing material containing aramid fibers.

7. The pulley structure according to claim 1 , wherein the accessory machine is an alternator that generates electricity by rotation of a drive shaft.

Assignees

• Mitsuboshi Belting Ltd

Inventors

• Shimamura Hayato
• Imai Katsuya
• Dan Ryosuke
• Morimoto Takashi

Classifications

• F16D41/206 Primary

  having axially adjacent coils, e.g. helical wrap-springs · CPC title

• F16C19/06

  with a single row or balls · CPC title

• F16H2055/366

  with means providing resilience or vibration damping · CPC title

• F16H55/36

  Pulleys (with features essential for adjustment F16H55/52) · CPC title

• F02B63/042

  Rotating electric generators · CPC title