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Power transmission device of a compressor

Inactive Publication Date: 2008-06-26
TOYOTA IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the seizure is occurred in the compressor, an excessively high axial force is applied to the engagement portion between the thread portion of the power shutoff member and the thread portion of the rotary shaft, so that the breakable portion of the power shutoff member is broken.
However, if the diameter of the rotary shaft is reduced, another problem may result.
That is, reducing the diameter of the rotary shaft in the power transmission device having the power shutoff member will decrease the strength of the rotary shaft, so that breakage of the rotary shaft may occur before the breakable portion of the power shutoff member is broken.
In other words, the power shutoff member may fail to function reliably.

Method used

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  • Power transmission device of a compressor
  • Power transmission device of a compressor
  • Power transmission device of a compressor

Examples

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first embodiment

[0018]The following will describe a power transmission device of the compressor according to the present invention with reference to FIG. 1 through FIG. 5. As shown in FIG. 1, the power transmission device of the compressor of the first preferred embodiment is generally designated by reference numeral 10. The power transmission device 10 includes a pulley 11, a hub 12, a power shutoff member 13, a cylinder 14 and a casing 16 of the compressor. The power transmission device 10 is used for transmitting torque to the rotary shaft 15 from the pulley 11. The pulley 11 is rotatably mounted on the casing 16 of the compressor and driven by an engine and the like (not shown). The hub 12 is connected to the pulley 11 for rotation therewith. The power shutoff member 13 functioning as a torque limiter is interposed between the hub 12 and the rotary shaft 15.

[0019]The pulley 11 is rotatably mounted through a bearing 17 on a boss 16a which is provided at one end of the casing 16. A belt 18 is wou...

third embodiment

[0052]Referring to FIG. 7 showing a power transmission device 50 of the third embodiment according to the present invention, the power transmission device 50 includes a cylinder 51 having formed at the inner periphery thereof an internal thread portion 51a and screwed over the rotary shaft 15 through engagement between the internal thread portion 51a of the cylinder 51 and the external thread portion 15e of the rotary shaft 15. The cylinder 51 is further formed at the outer periphery thereof with an external thread portion 51b for engagement with the internal thread portion 13c of the power shutoff member 13. In addition, the cylinder 51 has a flange 51c extending radially outward and a projection 51d extending from a radially inner region of the flange 51c axially rearward of the compressor. The projection 51d has at the rear end thereof a cylinder-side contacting surface 51e for contact with the shaft-side seating surface 21a of the rotary shaft 15. The flange 51c has at the front...

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Abstract

A power transmission device of a compressor includes a rotary shaft, a pulley, a hub, a power shutoff member, a spacer and a cylinder. The power shutoff member shuts off excessive torque transmission between the pulley and the rotary shaft of the compressor. The spacer is disposed on the rotary shaft. The cylinder is disposed between the power shutoff member and the rotary shaft. The cylinder has an external thread portion formed at the outer periphery thereof for engagement with an internal thread portion of the power shutoff member and an internal thread portion formed at the inner periphery thereof for engagement with an external thread portion of the rotary shaft. The cylinder has a contacting surface for contact with a seating surface of the spacer and a seating surface for contact with a contacting surface of the hub at the axial end portion of the hub.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2006-337229 filed on Dec. 14, 2006, the entire contents of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates generally to a power transmission device having a torque limiting function, and more particularly to a power transmission device of a compressor for a vehicle air conditioner which is driven by an external drive source such as an engine through a belt.BACKGROUND OF THE INVENTION[0003]A power transmission device for transmitting power to a compressor has a torque limiter or a power interrupting device for forestalling a trouble such as a breakage of a power transmission belt in the event of a seizure in the compressor. A conventional power transmission device which is disclosed, for example, in Japanese Patent Application Publication No. 2006-266483, has a pulley, a casin...

Claims

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Application Information

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IPC IPC(8): F04B35/00
CPCF16D9/08F16H55/36F16H35/10
Inventor ENOKIJIMA, FUMINOBUYOKOMACHI, NAOYAFUKANUMA, TETSUHIKO
Owner TOYOTA IND CORP
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