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Rotary transmissions for continuously variable transmissions

A technology of infinitely variable speed and pulleys, which is applied to components with teeth, transmission devices, transmission control, etc., and can solve the problems of increasing the axial length of the gearbox, increasing the space of the casing, and high axial loads

Inactive Publication Date: 2019-02-19
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Known pulley designs cause high axial loads on the shaft due to friction
In order to minimize the axial load on the shaft, the shaft is mounted using high load capacity bearings, resulting in increased cost and weight of the power unit
High-capacity bearings further increase space for components Housing, thus increasing the axial length of the gearbox

Method used

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  • Rotary transmissions for continuously variable transmissions
  • Rotary transmissions for continuously variable transmissions
  • Rotary transmissions for continuously variable transmissions

Examples

Experimental program
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Embodiment Construction

[0028] The following description is merely exemplary in nature and is not intended to limit the invention, application or uses.

[0029] see figure 1 A wheel or transmission pulley 10 of a motor vehicle CVT includes a hub or body 12 which may be, for example, a hollow tube or shaft having a longitudinal central hole 14 . According to some aspects a plurality of cylinders 16 , comprising cylinders 16 a through 16 k , are secured to body 12 , such as by welding or by a forging operation, such that successive ones of the cylinders (eg, 16 a, 16 b ) are equidistant around the perimeter of body 12 and are thus Same continuous angular positioning. The central axis 22 of each cylinder 16 is aligned with the longitudinal central axis 18 of the central bore 14 of the body 12 . Each cylinder 16 slidably receives a piston 20 each coaxially aligned with a central axis 22 of its respective cylinder 16 . A friction member 24 is connected to the free end of each piston 20 . Opposite ones...

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PUM

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Abstract

A continuously variable transmission pulley includes a body defining a hollow tube having a longitudinal central bore. A plurality of cylinders are secured to the body, each cylinder having a cylinder bore in fluid communication with the longitudinal central bore. A piston is slidably positioned in the bore of each of the cylinders. Pressurized fluid present in the central bore bears against each said piston equally to displace the piston outwardly. A biasing member is connected to each piston and is in direct contact with the pressurized fluid. A friction member is connected to the free end of each piston. Opposite ones of the friction members define a pulley diameter that varies depending on a portion of the diametrically opposed ones of the pistons extending outwardly from the cylinder.

Description

technical field [0001] This invention relates to automatic transmissions, and more particularly to pulleys for continuously variable transmissions. Background technique [0002] The statements in this section merely provide background information related to the present invention and may or may not constitute prior art. [0003] A continuously variable transmission ("CVT") typically includes a belt and pulley system that operably couples a rotating power source, such as an engine or an electric motor, to a dual gear final drive unit. A belt and pulley system typically includes first and second pairs of cone pulleys with a torque transmitting belt or chain extending between the cone pairs. Each bevel pair includes an axially fixed pulley member and an axially movable pulley member. Each movable pulley member is axially adjustable by a hydraulic system relative to the fixed pulley member. A hydraulic system provides first and second hydraulic pressures to respective moveable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H9/04F16H61/664F16H61/40
CPCF16H9/04F16H61/40F16H61/664F16H2710/00F16H9/10F16H55/54
Inventor Y·K·德万甘V·甘蒂
Owner GM GLOBAL TECH OPERATIONS LLC