Title:
RACK BAR BLANK MATERIAL, RACK BAR, RACK BAR BLANK MATERIAL MANUFACTURING METHOD AND RACK BAR MANUFACTURING METHOD
Document Type and Number:
Japanese Patent JP2019076905
Kind Code:
A
Abstract:
To improve a process tolerance of a rack bar and simplify a manufacturing process.SOLUTION: A rack bar blank material 10 has a rack part 11, which is engaged with a pinion, and an end part 12, which is provided on an end side of a hollow shaft material with respect to the rack part 11, on an axial direction one end side of the shaft material. The end part 12 has a diameter larger than that of a minimum circle which includes a cross section perpendicular to an axial direction of the rack part 11, and has a diameter same as that of a shank 13 on the other side in an axial direction of the shaft material. A rack bar 20, which is manufactured by use of this rack bar blank material 10, is provided with a thread groove 21 of a ball screw as a directing-acting element in an axial direction, at the shank 13.SELECTED DRAWING: Figure 1
Inventors:
YAMAWAKI TAKASHI
AOKI KENICHI
AOKI KENICHI
Application Number:
JP2017202925A
Publication Date:
May 23, 2019
Filing Date:
October 19, 2017
Export Citation:
Assignee:
NETUREN CO LTD
International Classes:
B21K1/76; B21J5/12; F16H19/04; F16H25/22; F16H25/24
Attorney, Agent or Firm:
Patent Business Corporation Koei Patent Office