Method of forming a one piece component

Inactive Publication Date: 2010-05-26
FORD MOTOR CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ring gear cannot be machined directly into the parking brake drum because the ring gear must be broached, which requires a long broachbar to pass completely through the ring gear

Method used

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  • Method of forming a one piece component
  • Method of forming a one piece component
  • Method of forming a one piece component

Examples

Experimental program
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Embodiment Construction

[0026] The present invention may be more readily understood by reference to the following description taken in conjunction with the accompanying drawings.

[0027] Referring now to the accompanying drawings, figure 1 Shown is a workpiece 10, preferably a plate, a section of round bar, or a coil of carbon steel, formed into an elongated cup shape 12 having a central bore 11 by conventional cold forging, hot forging or drawing methods . After annealing the cup-shaped preform 12 to soften the material so that the preform 12 is less brittle and relieves internal stresses, the cup-shaped preform 12 is processed by various methods, including by a spin forming operation, to manufacture A net shape preform 14 having an inner surface 16 , an outer surface 18 and an end 20 partially closed by a radial flange 22 .

[0028] figure 2 The illustrated spin forming process uses a mandrel 24 having an outer surface 26 . The net shape preform 14 is fitted over the mandrel and is secured at...

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PUM

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Abstract

A method for forming a component that transmits torque in an automatic transmission includes forming a workpiece with a hub concentric with and extending along an axis and forming the workpiece with a disc that is integral with the hub and extends radially outward from the hub. A hollow perform cylinder is formed integrally with the disc, located at a radial end of the disc distant from the hub, concentric with the axis, and includes an inner surface and an outer surface. A hollow perform cylinder is flow-formed using a flow-forming mandrel located within the cylinder and having an outer surface formed with gear teeth such that the inner surface of the cylinder conforms to at least a portion of the gear teeth on the flow-forming mandrel.

Description

technical field [0001] The present invention relates generally to metal forming, and more particularly to forming single-piece components that transmit torque in automatic transmissions. More specifically, the present invention relates to forming a ring gear-park drum as a single piece from a cold-formed or hot-formed pre-form. Background technique [0002] The kinematic arrangement of an automatic transmission for a rear wheel drive motor vehicle may include a Ravigneaux gearset whose components include two sun gears, a ring gear surrounding the sun gear, and two sets of planetary pinions gear. The first set of pinions meshes with the first sun gear and the ring gear, and the second set of pinions meshes with the second sun gear and the first set of pinions. The transmission output torque is carried by the ring gear and transferred axially by the parking brake drum to the radial disc and radially to the sleeve or hub The key is connected to the transmission output shaft ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/14
CPCB21D53/28Y10T29/49472Y10T29/49474
Inventor 约瑟夫·斯祖巴罗德·G·怀特贝克
Owner FORD MOTOR CO
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