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Planetary traction drive

A traction drive, planetary technology, applied in the direction of transmission, friction transmission, belt/chain/gear, etc.

Pending Publication Date: 2020-10-30
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although not stated, this allows this wedging action to occur in only one direction

Method used

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  • Planetary traction drive
  • Planetary traction drive
  • Planetary traction drive

Examples

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Embodiment Construction

[0026] The invention will be described with reference to the accompanying examples, which are examples of embodiments of the invention, but do not limit the scope of the invention. For example, the number of planetary rollers and wedge rollers may vary, the support and bearing arrangement may vary according to the particular application, and the dimensions and materials used may vary according to the specific requirements of the particular application of the invention.

[0027] It is also important to understand that with conventional geared epicyclic systems using the sun, rings, planets, and planetary carriers, twelve rotational states are possible and are commonly used in mechanical systems.

[0028] 1) Carriage fixed, torque input to the sun and output to the carriage

[0029] 2) Carriage fixed, torque input to the ring and output to the sun

[0030] 3) Sun fixed, torque input from the ring and output from the carrier

[0031] 4) Sun fixed, torque input to carrier and ou...

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PUM

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Abstract

An epicyclic traction drive transmission, including a carrier (7) having a central axis, a sun shaft (9) rotationally mounted within carrier (7) and positioned in the central axis, a plurality of planet rollers (4) mounted on carrier (7) and arranged to rotate on respective angularly equidistant axles (5), and rotationally engage the sun shaft (9), and an outer ring (1). A wedge roller (2,3) associated with each planet roller (4) is free to translate relative to carrier (7); and engages outer ring (1) and respective planetary roller (4) with a frictional or traction coefficient mu, and the wedge roller (2,3) defining a wedging angle alpha, such that tan alpha / 2 is less than mu. In one form there are two wedge rollers (2,3) for each planet roller, allowing for a wedging action in either direction of rotation.

Description

technical field [0001] This invention relates to epicyclic concentric friction and traction drives. Background technique [0002] Traction drives (sometimes called friction drives) are drives in which hard cylindrical surfaces are used to transfer motion using the coefficient of traction of a traction fluid located between the surfaces. Under low-speed conditions, the metal surfaces may engage each other, but under high-speed load conditions, the metal surfaces do not directly engage and the force is transferred through the traction fluid that develops between the two rolling surfaces. The surface velocity at which the contact transitions from frictional contact to complete separation by the fluid varies with the surface roughness of the rolling elements and the amount of traction fluid supplied to the rolling contact, but is typically at rolling velocities above 1 m / s. [0003] In one form, the traction drive takes the form of an epicyclic system consisting of a central su...

Claims

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Application Information

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IPC IPC(8): F16H13/08F16H13/10F16H15/56
CPCF16H13/08F16H15/56F16H13/10F16H13/14F16H13/12
Inventor 迈克尔·杜拉克
Owner ULTIMATE TRANSMISSIONS
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