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Tube forming method and shock absorber

A processing method and process technology, which is applied in the field of cylinder processing methods and buffers, and can solve the problems of increased manufacturing costs and the like

Inactive Publication Date: 2014-04-09
HITACHI AUTOMOTIVE SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cutting of the casing is a factor that increases the manufacturing cost of the cylinder device.

Method used

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  • Tube forming method and shock absorber
  • Tube forming method and shock absorber
  • Tube forming method and shock absorber

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Embodiment Construction

[0017] One embodiment of the present invention will be described with reference to the drawings. First, the damping force adjustable hydraulic shock absorber 1 of this embodiment will be described. It should be noted that, referring to figure 1 The upper and lower representations in the description of the hydraulic shock absorber 1 figure 1 up and down. Such as figure 1 As shown, the hydraulic shock absorber 1 has a double cylinder structure including an outer cylinder 2 and an inner cylinder 3 (cylinder). In addition, the hydraulic shock absorber 1 has a separation cylinder 4 (tube) disposed between the outer cylinder 2 and the inner cylinder 3 . On the outside of the separation cylinder 4 between the outer cylinder 2 and the inner cylinder 3, a storage chamber 5 which is an annular space is formed.

[0018] A piston 6 is slidably inserted inside the inner cylinder 3, and the inner side of the inner cylinder 3 is divided into a first chamber 3A and a second chamber 3B by...

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Abstract

A separator tube (4) is manufactured by a forming method including three steps: a groove forming step of forming a housing (22) by beading; a pressing step of pressing at least one corner of an opening of the housing (22) to form an impression; and a sizing step of sizing an end (20) of the separator tube (4). Thus, the housing (22) can be formed on the inner periphery (21) of the end (20) of the separator tube (4) with high accuracy without performing cutting.

Description

technical field [0001] The invention relates to a barrel processing method and a buffer. Background technique [0002] Conventionally, a cylinder device in which a separator is provided between the cylinder and an outer cylinder is known as a cylinder device mounted on a suspension of a vehicle. For example, the separation cylinder described in JP-A-11-159563 is externally fitted to the cylinder via O-rings (sealing members) on the inner peripheral sides of both ends. The O-ring is required to have high sealing performance (for example, 20 MPa), and in order to meet this requirement, it is necessary to improve the shape accuracy of the housing (O-ring groove) formed on the inner peripheral side of the separation cylinder. Specifically, the shape accuracy of the housing is required to conform to the basic dimensions of the housing specified in JISB2401. In order to satisfy the basic dimensions, the housing is currently processed by cutting. However, cutting of the casing is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00F16F9/36
CPCF16F9/062F16F9/3235F16F9/369F16F2226/00F16J10/02B21D17/00B21D28/28B21D53/06F16F9/32
Inventor 西村诚
Owner HITACHI AUTOMOTIVE SYST LTD