192 clutches and power-stop control – Clutches – Automatic
Patent
1992-10-26
1995-01-17
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Automatic
192 56R, F16D 4320, F16D 4106
Patent
active
053818792
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a torque absorber which can absorb a difference present in driver side torque and follower side torque in a power transmission system.
There may be in a power transmission system a case where a torque higher than expected applies to the driver-to-follower connection portion of the system or an impulsive torque generates a large torque exceeding the rated torque, while loading is changing, or the driving device is first initiated and connected to accelerate the follower device. In such a case, with the prior art, a torque limiter, auto tensioner, clutch or brake is used to absorb the differential torque.
According to the prior art, however, in order to absorb the torque, two bodies are depressed to each other to generate a friction force between them, or a fluid or powder is incorporated in the device to use its stirring friction, or a magnetic force is utilized. In the above cases, the prior art must involve a sliding friction, thus producing an irregular torque setting due to the difference between static friction and dynamic friction.
For example, some type of torque limiter uses a tightening force through a rotation of coil spring and the like, for obtaining a friction force. With the type, however, since not only a friction coefficient between the spring and the friction members depends on their temperature, thus sometimes changing the friction force, but also the inclusion of spring and the like may have a difficulty in maintaining a high dimensional accuracy of the transmission system, an exact setting of limit torque cannot be expected. Further, such construction cannot transmit or absorb such a large torque as actually required.
SUMMARY OF THE INVENTION
To solve the above problems, the present invention intends to provide a compact torque absorber in which not only limit torque can be set with a high accuracy, but also large torque can be transmitted or absorbed, as follows:
A torque absorber according to the present invention comprises: rotation bodies, an energizing means and a power transmission rotation body; and mono-hyperboloid of revolution about one axis; mono-hyperboloid of revolution about the axis; with each other to form a set of combined raceways; rolling surface is arranged in a circumferential direction of the raceway at an angle to a cross section including the axis, and the surface of the intermediate rotation bodies is arranged so as to come into linear contact with the inner raceway and the outer raceway; outer rotation body and around the end side of the inner rotation body through a bearing, so as to be rotatable relative to the inner rotation body while keeping a constant axial position relative to the inner rotation body, and is connected with the outer rotation body by a torque transmission means which transmits a torque between said power transmission rotation body and said outer rotation body; and body and the outer rotation body, and, when the inner rotation body or the outer rotation body is rotating in such a direction as to widen the raceway gap, energizes the outer rotation body in the axial direction and in such a direction as to narrow the gap, so that a rotational resistance equal to the maximum torque transmitted between the inner rotation body and the outer rotation body can be given between the intermediate rotation bodies and the inner rotation body / the outer rotation body.
A torque absorber of the present invention comprises: rotation bodies, an energizing means, a power transmission rotation body and a movement stop member; and mono-hyperboloid of revolution about one axis; mono-hyperboloid of revolution about the axis; with each other to form a set of combined raceways; rolling surface is arranged in a circumferential direction of the raceway at an angle to a cross section including the axis, and the surface of the intermediate rotation bodies is arranged so as to come into linear contact with the inner raceway and the outer raceway; outer rotation body and around the end side of the inner rotation body through a bearing, so as
REFERENCES:
patent: 1670197 (1928-05-01), Humfrey
patent: 1955879 (1934-04-01), Griswold
patent: 3557921 (1971-01-01), Takada
patent: 5035309 (1991-07-01), Takada
patent: 5109964 (1992-05-01), Fukui et al.
Bonck Rodney H.
THK MENT Research Co., Ltd.
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