Helical tooth belt and belt transmission

Patent metadata

Field	Value
Publication number	US-12140201-B2
Application number	US-201917043120-A
Country	US
Kind code	B2
Filing date	Mar 27, 2019
Priority date	Apr 6, 2018
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

The present invention relates to a helical toothed belt including: a back portion; a tension member buried in the back portion; and a plurality of tooth portions arranged at a predetermined interval along a belt longitudinal direction on one surface of the back portion, in which the plurality of tooth portions have a tooth pitch of 1.5 mm or more and less than 2.0 mm, the back portion has a thickness of 0.4 mm or more and 1.2 mm or less, the tension member is formed of a twisted cord containing a high-strength glass fiber or a carbon fiber, and the ratio of the total value of an interval between the tension members adjacent to each other to the belt width is 20% or more and 60% or less.

First claim

The invention claimed is:

1. A helical toothed belt, comprising:
a back portion;
a plurality of tension members buried in the back portion and arranged in a belt width direction; and
a plurality of tooth portions that are arranged at a predetermined interval along a belt longitudinal direction on one surface of the back portion and each are inclined with respect to the belt width direction,
wherein a surface of the tooth portion and a portion of the one surface of the back portion are formed of a tooth fabric,
wherein the plurality of tooth portions have a tooth pitch of 1.5 mm or more and less than 2.0 mm, while the back portion has a thickness of 0.4 mm or more and 1.2 mm or less,
the tension members are formed of a twisted cord containing a high-strength glass fiber or a carbon fiber, and
wherein a ratio of a total value of an interval between the tension members adjacent to each other in a belt width direction to the belt width is in a range of 20% or more and 40% or less.

2. The helical toothed belt according to claim 1 , wherein each of the plurality of tension members has a diameter in a range of 0.2 mm or more and 0.6 mm or less.

3. The helical toothed belt according to claim 1 , wherein the tension members are arranged such that each tension member pitch between the adjacent tension members is in a range of 0.45 mm or more and 1.0 mm or less.

4. The helical toothed belt according to claim 3 , wherein the tension members buried in the back portion are arranged such that the tension member pitch is a constant value in a range of 0.45 mm or more and 1.0 mm or less from one end to the other end of the helical toothed belt in the belt width direction.

5. The helical toothed belt according to claim 1 , wherein the tooth portion has a tooth height in a range of 0.6 mm or more and 1.0 mm or less, and has a height in a range of 40% to 50% relative to the tooth pitch.

6. The helical toothed belt according to claim 1 , wherein the back portion comprises a rubber component, and the rubber component comprises at least an ethylene-propylene-diene terpolymer or hydrogenated nitrile rubber.

7. The helical toothed belt according to claim 1 , wherein the tooth fabric is formed of a woven fabric comprising warp yarns and weft yarns, and the warp yarns or the weft yarns are disposed so as to extend in the belt longitudinal direction, and the warp yarns or the weft yarns disposed so as to extend in the belt longitudinal direction comprises an elastic yarn having stretchability.

8. The helical toothed belt according to claim 1 , wherein the tooth fabric is formed of fibers comprising at least one kind of fibers selected from the group consisting of nylon, aramid, polyester, polybenzoxazole, and cotton.

9. The helical toothed belt according to claim 1 , wherein another surface of the back portion is formed of a back fabric, and
the back fabric is formed of fibers comprising at least one kind of fibers selected from the group consisting of nylon, aramid and polyester.

10. The helical toothed belt according to claim 1 , having a belt elastic modulus of 22 N/% or more, the belt elastic modulus defined by a belt tension (N) per 1 mm of the belt width with respect to a belt elongation rate (%) when the helical toothed belt is wound around pulleys with a predetermined mounting tension.

11. A belt power transmission device, comprising:
a driving pulley rotationally driven by a driving source;
a driven pulley; and
the helical toothed belt as described in claim 1 , wound around the driving pulley and the driven pulley.

12. The belt power transmission device according to claim 11 , wherein the driving pulley has a rotational speed of 1,000 rpm or more and 4,000 rpm or less.

13. The belt power transmission device according to claim 11 , wherein the driven pulley is applied a load of 0.5 kW or more and 3 kW or less.

14. The belt power transmission device according to claim 11 ,
wherein the driven pulley has an outer diameter larger than an outer diameter of the driving pulley, and
the belt power transmission device is a deceleration device of an electric power steering apparatus for vehicles.

Assignees

• Mitsuboshi Belting Ltd

Inventors

• NOBORIKAWA Yoshihito
• Yoshida Masakuni

Classifications

• F16G1/10 Primary

  with textile reinforcement · CPC title

• D03D15/283

  synthetic polymer-based, e.g. polyamide or polyester fibres (cellulose-based artificial fibres D03D15/225) · CPC title

• F16H7/023

  with belts having a toothed contact surface or regularly spaced bosses or hollows for slipless or nearly slipless meshing with complementary profiled contact surface of a pulley · CPC title

• F16G1/08

  with reinforcement bonded by the rubber · CPC title

• F16G1/04

  made of fibrous material, e.g. textiles, whether rubber-covered or not (F16G1/28 takes precedence; making thereof D03D {; consisting of several parts F16G1/22}) · CPC title