BELT TRANSMISSION DEVICE

• US 20090062050A1
• Filed: 03/22/2006
• Published: 03/05/2009
• Est. Priority Date: 03/22/2005
• Status: Active Grant

• Current Assignee: Bando Chemical Industries Limited
• Original Assignee: Bando Chemical Industries Limited
• Inventors: Hayashi, Takehiro
• Granted Patent: US 8,608,603 B2
• Time in Patent Office: Days
• US Class Current: 474/167
• CPC Class Codes: F16G 5/04 made of rubber F16G5/02 takes precedence consisting of several parts F16G5/16
• CPC Class Codes: F16G 5/20 with a contact surface of special shape, e.g. toothed
• CPC Class Codes: F16H 35/10 Arrangements or devices for absorbing overload or preventing damage by overload for screw mechanisms F16H25/2021
• CPC Class Codes: F16H 7/02 with belts; with V-belts
• CPC Class Codes: Y10T 74/19847 torque actuated safety devices

Abstract

[Purpose] A belt drive system, in which a drive belt 20 is wrapped between a drive pulley 1 drivingly connected to a drive source 11 and a driven pulley 2 connected to an driven unit 12 via a joint 32 provided to stop torque transmission when receiving a load equal to or over a predetermined value and torque is transmitted via the drive belt 20 from the drive pulley 1 to the driven pulley 2, ensures that when the driven unit 12 malfunctions, the joint 32 stops the torque transmission without unnecessarily increasing the coefficient of friction against the driven pulley 2 or the belt tension.

[Solution] The belt drive system is configured so that when a slip corresponding to the load on the joint 32 equal to or over the predetermined value occurs between the drive belt 20 and the driven pulley 2, the coefficient of friction between the drive belt 20 and the driven pulley 2 becomes higher than that before the slip occurs.

Claims

1. A belt drive system comprising:

a drive source for generating torque;

a drive pulley, drivingly connected to the drive source, for outputting the torque of the drive source;

at least one driven unit for performing a specified action upon input of the torque;

a driven pulley, connected to the driven unit, for inputting the torque to the driven unit;

a drive belt, wrapped between the drive pulley and the driven pulley, for transmitting the torque of the drive pulley to the driven pulley by frictional engagement with the drive pulley and the driven pulley; and

a joint, interposed between the driven pulley and the driven unit to transmit the torque of the driven pulley to the driven unit, for stopping the torque transmission when receiving a load equal to or over a predetermined value,

the belt drive system being configured so that when a slip corresponding to the load on the joint equal to or over the predetermined value occurs between the drive belt and the driven pulley, the coefficient of friction between the drive belt and the driven pulley becomes higher than that before the slip occurs.

2. The belt drive system of claim 1, wherein a belt material forming the contact surface of the drive belt with the driven pulley is provided to partly transfer to the driven pulley owing to the slip caused between the drive belt and the driven pulley.

3. The belt drive system of claim 2, wherein the coefficient of friction between the drive belt and the driven pulley when the load on the joint is below the predetermined value is 1.4 or smaller and the coefficient of friction when the load on the joint is equal to or over the predetermined value is 1.8 or larger.

4. The belt drive system of claim 2, wherein

the belt material of the drive belt is a rubber material, and

the main rubber ingredient of the rubber material is EPDM.

5. The belt drive system of claim 2, wherein

the belt material of the drive belt is a rubber material, and

the main rubber ingredient of the rubber material is ACSM.

6. The belt drive system of claim 4, wherein the rubber material of the drive belt contains 10 to 20 vol % carbon.

7. The belt drive system of claim 4, wherein the rubber material of the drive belt contains 6 or more vol % aliphatic polyamide fibers.

8. The belt drive system of claim 1, wherein

the drive source is an engine for a motor vehicle, and

the driven unit is an accessory of the engine.