Manufacturing method for shock absorber

Patent metadata

Field	Value
Publication number	US-10180172-B2
Application number	US-201515123317-A
Country	US
Kind code	B2
Filing date	Mar 17, 2015
Priority date	Mar 25, 2014
Publication date	Jan 15, 2019
Grant date	Jan 15, 2019

Abstract

A rotation lock is provided to a piston rod, a collar is fitted on a small-diameter portion disposed on an end portion on a side of the piston rod extending from a cylinder, and the collar is press-fitted onto a press-fitted portion disposed on the piston rod by a press-fitting jig screwed with an external thread formed on the small-diameter portion. The press-fitting jig adds an axial force to the collar.

First claim

The invention claimed is:

1. A manufacturing method for manufacturing a shock absorber with a collar secured by press-fitting on a piston rod extending from a cylinder, comprising:
a step of providing a rotation lock to the piston rod by engaging a rotation locking jig in an engaging portion disposed on an end surface on a side of the piston rod extending from the cylinder;
a step of fitting the collar on a small-diameter portion disposed on an end portion on the side of the piston rod extending from the cylinder;
and a step of press-fitting the collar onto a press-fitted portion disposed on the piston rod by a press-fitting jig screwed with an external thread formed on the small-diameter portion, the press-fitting jig adding an axial force to the collar, and the rotation locking jig preventing rotation of the piston rod during the press-fitting step.

2. The manufacturing method for the shock absorber according to claim 1 , wherein
the collar is press-fitted onto the press-fitted portion of the piston rod using a plurality of convex portions disposed in a circumferential direction on an inner circumferential surface, the plurality of convex portions having interferences with the press-fitted portion of the piston rod.

3. The manufacturing method for the shock absorber according to claim 1 , further comprising
a step of determining a press-fitting state of the collar on the basis of a count of rotation of the press-fitting jig and a rotating torque of the press-fitting jig.

4. The manufacturing method for the shock absorber according to claim 1 , wherein
a thrust bearing is arranged between the press-fitting jig and the collar, and the axial force is added from the press-fitting jig to the collar via the thrust bearing.

Assignees

• Kyb Corp

Inventors

• Asaoka Shotaro
• Ozeki Tsutomu

Classifications

• B60G2206/82092

  by press-fitting · CPC title

• B60G2204/128

  Damper mount on vehicle body or chassis · CPC title

• F16F9/54 Primary

  Arrangements for attachment {(grommet-type rubber mounting springs per se F16F1/3732; construction of cylinder ends F16F9/3242; attachments to vehicles B60G13/001, B60G15/00)} · CPC title

• F16F9/19

  with a single cylinder {and of single-tube type} · CPC title

• B60G13/003

  characterised by the mounting on the vehicle body or chassis of the damper unit · CPC title