One way clutch

a technology of one way clutch and friction plate, which is applied in the direction of clutches, clutches, mechanical actuated clutches, etc., can solve the problems of reducing the efficiency of automatic transmission, unable to break through the oil film on the contact portions of inner and outer rings, and not being able to achieve normal engagemen

Inactive Publication Date: 2014-04-17
NSK WARNER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Ensures effective engagement of torque transmission members in low temperature environments without increasing dragging torque during idle rotation, enhancing the clutch's performance and reducing wear.

Problems solved by technology

However, in the case of the above described prior art structure, if the one way clutch is used in a very low temperature (e.g. −20° C. to −40° C.) environment in which lubricant oil or automatic transmission fluid (ATF) used in the automatic transmission has a high viscosity, the torque transmission member cannot break through the oil film on the contact portions of the inner and outer rings at the time when engagement with the inner and outer rings is to be achieved.
Thus, there may be cases where normal engagement is not achieved, and the torque transmission member continuously slides on the oil (ATF) having a high viscosity.
In this case, however, a dragging torque during idle rotation is also increased, which lead to other problems, such as promotion of abrasion of the torque transmission member and the inner or outer ring and a decrease in the efficiency of the automatic transmission.

Method used

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Experimental program
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Effect test

first embodiment

[0035]A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of the first embodiment of the one way clutch according to the present invention. FIG. 2 is an enlarged view showing a portion of the one way clutch shown in FIG. 1. FIG. 3 is a cross sectional view seen from the direction indicated by arrows B in FIG. 2. The one way clutch of this embodiment is to be built in frictional engagement means of an automatic transmission for an automobile, and the overall structure of the automatic transmission is the same as that of the prior art apparatus described before.

[0036]As shown in FIGS. 1 and 2, the one way clutch 1 includes a cylindrical inner ring 3 having a smooth outer surface, an annular outer ring 5 that is disposed coaxially with the inner ring 3 and rotatable relative to the inner ring 3, a number of cylindrical rollers 7 that are provided between the inner ring 3 and the outer ring 5 to serve as torque transmissio...

second embodiment

[0046]In the following, a second embodiment of the present invention will be described. FIG. 4 is a front view of the second embodiment of the one way clutch according to the present invention. FIG. 5 is an enlarged view showing a portion of the one way clutch shown in FIG. 4. FIG. 6 is a cross sectional view seen from the direction indicated by arrows D-D in FIG. 5. The one way clutch of this embodiment is to be built in frictional engagement means of an automatic transmission for an automobile as with the one way clutch according to the first embodiment, and the overall structure of the automatic transmission is the same as that of the prior art apparatus described before.

[0047]As shown in FIGS. 4 and 5, the one way clutch 101 includes a cylindrical inner ring 103, an annular outer ring 105 having an smooth inner circumferential surface that is disposed coaxially with the inner ring 103 and rotatable relative to the inner ring 103, a number of cylindrical rollers 107 that are prov...

third embodiment

[0057]In the following a third embodiment of the present invention will be described. FIG. 7 is a partial enlarged view of a one way clutch according to the third embodiment of the present invention. FIG. 8 is a further enlarged view showing a relevant portion of the portion shown in FIG. 7. The one way clutch of this embodiment is also to be built in frictional engagement means of an automatic transmission for an automobile as with those according to the first and second embodiments, and the overall structure of the automatic transmission is the same as that of the prior art apparatus described before.

[0058]The one way clutch 201, a part of which is shown in FIG. 7 in an enlarged manner, includes a cylindrical inner ring 203 having a smooth outer surface, an annular outer ring 205 that is disposed coaxially with the inner ring 203 and rotatable relative to the inner ring 203, a number of cylindrical rollers 207 that are provided between the inner ring 3 and the outer ring 205 to se...

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Abstract

One way clutch has an inner ring, an outer ring and torque transmission members between them. Each torque transmission member can shift between a torque transmission position and a non torque transmission position. Biasing members bias the torque transmission members respectively toward the torque transmission positions. A retainer includes first and second mount portions that retain the torque transmission members and the biasing members corresponding thereto. Each of the mount portions has a securing portion that secures one end of the biasing member, and the torque transmission member is pressed by the other end of the biasing member. The biasing force that the biasing members retained by the second mount portions exert on the torque transmission members corresponding thereto is larger than the biasing force that the biasing members retained by the first mount portions exert on the torque transmission members corresponding thereto.

Description

[0001]This application claims the benefit of Japanese Patent Applications No. 2008-216930 and No. 2009-113854 which are hereby incorporated by reference.FIELD OF THE INVENTION[0002]The present invention relates to a one way clutch that can be suitably used particularly in an automatic transmission of an automobile.RELATED BACKGROUND ART[0003]An automatic transmission for an automobile is typically equipped with a two to five speeds planetary gear transmission mechanism in addition to a torque converter in the form of a fluid coupling, and gear change is performed by appropriately fixing and releasing a sun gear and planetary gears etc. in the planetary gear transmission mechanism by frictional engagement means such as a clutch or a brake. In some cases, the frictional engagement means internally built in the automatic transmission is internally equipped with a one way clutch to allow free rotation of the gear shaft etc. in one rotational direction, to thereby facilitate gear shift c...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): F16D41/066
CPCF16D41/066F16D41/067
InventorYAMAMOTO, NORIHIRO
OwnerNSK WARNER