Method for working outer race of one-way clutch of roller type

Inactive Publication Date: 2010-01-07
NSK WARNER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]Accordingly, an object of the present invention is to provide a method for working or forming an outer race of a one-way clutch of roller type, in which cam surfaces of pockets are worked by milling working so that the method can cope with the few manufacturing number of parts flexibly, can reduce a cost of the part and can easily cope with different cam configurations.

Problems solved by technology

In particular, in a one-way clutch of roller type of a motor bike, since the number of rollers is small (for example, three to six), if the respective rollers are not engaged securely, a design torque capacity may not be maintained.
However, in the broach working for forming the cam surfaces of the roller-type one-way clutch of this type, since the cam surface has a deep recess, a broaching tool must be lengthened, thereby increasing a tool cost and a manufacturing cost.
Further, also regarding the abrasive re-polishing of a cutting edge of the broaching tool, a high cost is required.
In the conventional broach working, if recessed portions are previously formed in cam portions of a work piece or stock, a phase between the recessed portions and cam surface working cutting edges of the broaching tool will be deviated, with the result that the cutting edges are worn unevenly, thereby affecting a bad influence upon a service life of the broaching tool, and, thus, this technique could not be applied.
Further, cutting fluid for the broaching tool is oil and water-miscible cutting fluid was not used since it reduces the service life of the broaching tool.
Thus, there arose an environmental problem.
Further, in the broach working, axial cutting scars are formed on the cam surfaces and this is not preferable for enhancing the anti-crack life of the outer race which is decreased by repeated loads applied to the one-way clutch.
Further, the working method described in the above-mentioned Japanese Patent Application Laid-open No. 2003-172377 has a disadvantage that the method is not suitable for an outer race having a great thickness.

Method used

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  • Method for working outer race of one-way clutch of roller type
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  • Method for working outer race of one-way clutch of roller type

Examples

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first embodiment

[0045]Next, a method for forming or working the cam surface 12 of the outer race 1 according to the present invention will be explained. A ring-shaped stock or work piece for the outer race as a hollow member previously made of steel by forging is prepared. When assembled as the one-way clutch, the inner race 2 is fitted in the hollow portion.

[0046]At positions corresponding to positions where the pockets 4 are to be formed, each pocket 4 is being cut by milling working in an inner peripheral surface of the annular outer race stock from an opening side of the pocket 4. An end mill can be used to perform the milling working.

[0047]Although oil can be used as cutting fluid for the milling working, water-miscible cutting fluid can be used, and, when the water-miscible cutting fluid is used, an environmental problem is improved effectively.

[0048]FIG. 4 is a view showing a completed outer race 1 having three pockets 4 formed by the milling working along the circumferential direction. The ...

second embodiment

[0049]FIG. 5 is a front view of an outer race in which recessed portions were previously formed in an inner peripheral surface of the outer race. The outer race 1 is formed as a ring shape having a hollow portion 43 previously formed by forging, and recessed portions 42 are previously formed in an inner diameter surface of the outer race at positions corresponding to the pockets 4.

[0050]Similar to the first embodiment, in correspondence to the positions where the pockets 4 are to be provided, each pocket 4 is being cut by the milling working in the inner peripheral surface of the annular outer race stock from the opening side of the pocket 4 to the recessed portion 42. In the second embodiment, areas 45 shown by the hatching lines in FIG. 5 are cut.

[0051]As is in the second embodiment, by previously providing the recessed portions in the outer race stock by the forging, a cutting amount for the milling working can be reduced. Thus, a working time can be shortened and a material cost...

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Abstract

The present invention provides a method for working an outer race of a one-way clutch of roller type comprising an outer race having pockets provided at their inner surfaces with cam surfaces, an inner race spaced inwardly from the outer race in a radial direction and disposed in concentric with the outer race, and a plurality of rollers disposed in the pockets and adapted to transmit torque between the outer race and the inner race when engaged by the cam surfaces, wherein the cam surfaces of the outer race are formed by milling working.

Description

[0001]This application claims the benefit of Japanese Patent Application No. 2008-175776, filed Jul. 4, 2008, which is hereby incorporated by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a method for working or forming an outer race of a one-way clutch of roller type used as a part of a torque transmitting element or a back stop in a driving apparatus of a motor vehicle, an industrial machine and the like, for example.[0004]2. Related Background Art[0005]In general, a one-way clutch of roller type is comprised of an outer race, an inner race disposed in concentric with the outer race, a plurality of rollers disposed between an outer peripheral surface of the inner race and inner peripheral cam surfaces of the outer race and adapted to transmit torque, and springs contacted with idle rotation sides of the rollers.[0006]With this arrangement, in the one-way clutch, the inner race is designed so as to be rota...

Claims

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Application Information

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IPC IPC(8): B21D53/10
CPCB23P15/00Y10T29/49636F16D2250/00F16D41/067
InventorSAITO, YOSHIYAKARASAWA, SHUNICHI
OwnerNSK WARNER