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Composite steering rack

A technology for steering racks and racks, which is applied to steering gears, steering rods, steering mechanisms, etc., and can solve problems such as insufficient weight reduction of tubular rods

Inactive Publication Date: 2007-12-05
BISHOP INNOVATION PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To accommodate these features at a fixed wall thickness of the tubular shank, the remainder of the tubular shank is thicker than it needs to be, whereby these modular racks do not fully realize the weight saving potential of having a tubular shank

Method used

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  • Composite steering rack
  • Composite steering rack
  • Composite steering rack

Examples

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Embodiment Construction

[0031] Figures 1-4 show a first embodiment of a combined steering rack 1 comprising a forged D-rack tooth member 2 and a tubular shank member 3 according to the invention. The toothed member 2 has a toothed portion 4 occupying a substantial length, a tie rod end 5 with an internal thread 22 for connecting the tie rod, and a connection end 6 provided on its opposite end.

[0032] The toothed member 2 can be formed by flameless warm forging from a solid cylindrical billet using, for example, the die apparatus disclosed in WO2005 / 053875 (Bishop Innovation Limited). Once the toothed member 2 has been forged, the toothed portion 4 is subsequently induction hardened. The ends of the toothed members 2 are then left in a soft state so that the tie rod ends 5 and the connection ends 6 are machined. The connection end 6 comprises an external thread 23 , a cylindrical positioning portion 24 , and a radial step 25 positioned axially between the external thread 23 and the toothing 4 . Th...

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PUM

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Abstract

A steering rack for a vehicle rack and pinion steering gear comprising a first member having a toothed region, attached to a tubular second member. The second member having a region of increased wall thickness and reduced bore diameter formed by an upsetting operation. The region of increased wall thickness being located at or near the end of the second member that is attached to the first member.

Description

technical field [0001] The present invention relates to a steering rack for a vehicle rack-and-pinion steering device, and more particularly to such a rack manufactured by connecting a tubular member with a toothed member. Background technique [0002] Most vehicle steering racks are made from a round solid bar stock having a toothed section with a hole drilled through the bar near one end. This results in the toothing having a 'D' shape in cross-section and hence these racks are generally referred to as "D-racks". Such a D-rack with drilled holes has significantly less flexural strength than the round, solid shank protruding therefrom. However, in order to minimize the weight of the steering rack, the toothed portion and the shank have similar bending strengths. A common solution to this problem is to hole drill the majority of the length of the shank, thereby forming a tubular shank. However, deep drilling has the disadvantage of wasting material and its process is quit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D3/12F16H19/04
CPCY10T74/1967B62D3/126F16H55/26B62D7/20
Inventor J·巴克斯特
Owner BISHOP INNOVATION PTY LTD