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Ball Screw And Steering Apparatus

A ball screw and ball technology, applied in steering mechanisms, transmissions, mechanical steering gears, etc., can solve problems such as collision noise and contact

Inactive Publication Date: 2015-08-26
SHOWA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, there is a problem that a step is formed between the guide protrusion and the helical groove of the lead screw, whereby a collision noise is generated when the ball comes out of the helical groove of the lead screw and comes into contact with the step

Method used

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  • Ball Screw And Steering Apparatus
  • Ball Screw And Steering Apparatus
  • Ball Screw And Steering Apparatus

Examples

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example

[0056] In the present embodiment, the groove side located on the outside in the direction of the axis O functions as a groove side 75A along which the ball 41 is lifted. Conversely, the groove side located on the inner side in the axis O direction can function as one groove side 75A. In this case, the path 18 of the end deflector 2 is formed in such a way that the first path 18A joins the second path 18B when inclined toward the inside in the direction of the axis O.

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Abstract

A ball screw includes: a nut; a screw shaft; and an end deflector that is attached to the nut, and has a guiding protrusion portion which protrudes toward a helical groove of the screw shaft, in which a guiding tip edge of the guiding protrusion portion picks up a ball and guides the ball into the end deflector, the end deflector includes a ball lifting portion that lifts the ball along one groove side surface of the helical groove, and the guiding tip edge picks up the ball lifted by the ball lifting portion.

Description

technical field [0001] The invention relates to a ball screw and a steering device. Background technique [0002] There is a method of circulating the ball screw using end deflectors. In this method, a circulation path is formed in the nut to circulate the balls. End deflectors are attached to each end of the nut to guide balls from the helical grooves of the nut and lead screw to the circulation path, or to return the balls from the circulation path to the helical groove (see Patent Document 1 (JP -A-2012-154437)). The end deflector has a guide protrusion (claw in Patent Document 1) that protrudes into the helical groove of the lead screw to pick up the balls into the end deflector. Contents of the invention [0003] Since the lead screw is a moving body, a gap is provided between the guide protrusion and the helical groove of the lead screw to prevent interference between the guide protrusion and the lead screw. That is, there is a problem that a step is formed betwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H25/22B62D3/06
CPCB62D5/0448B62D3/08B62D3/06F16H25/2204F16H25/2219Y10T74/18576F16H2025/2242
Inventor 伊藤亮太
Owner SHOWA CORP
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