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Fluid pressure cylinder

A technology of fluid pressure cylinder and cylinder head, which is applied in the direction of fluid pressure actuation device, etc., and can solve the problem of large cylinder head

Active Publication Date: 2013-07-31
KYB CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the cylinder head becomes larger

Method used

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  • Fluid pressure cylinder
  • Fluid pressure cylinder
  • Fluid pressure cylinder

Examples

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Embodiment Construction

[0017] refer to figure 1 , The fluid pressure cylinder 1 is a linear motion drive part (linear actuator) that expands and contracts according to the pressure of the working fluid, for example, it is installed between a bucket and an arm of a power excavator, and is used to drive the bucket. However, the present invention does not limit the use of the fluid pressure cylinder 1 . As the working fluid of the fluid pressure cylinder 1, working oil is preferably used. Water-soluble replacement fluid can also be used instead of working oil.

[0018] The fluid pressure cylinder 1 includes: a cylindrical cylinder body 10 having a central axis O and an opening at one end; a piston 40 mounted inside the cylinder body 10 in a manner capable of sliding along the direction of the central axis O; a cylindrical piston rod 20 , which is combined with the piston 40 , protrudes from the open end of the cylinder 10 in the axial direction; and the cylinder head 30 , which supports the piston ro...

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Abstract

When a fluid pressure cylinder (1) is in a maximum expansion state, a piston (40) contacts a cylinder head (30). The cylinder head (30) is fixed to a cylinder tube (10) by a plurality of head bolts (12). The cylinder head (30) includes a pipe attachment seat (36), and the head bolts (12) are disposed in a first region (A) that avoids the pipe attachment seat (36). A non-contact portion in which contact is avoided between the piston (40) and the cylinder head (30) is formed in a second region (B) other than the first region (A), and therefore, when the fluid pressure cylinder (1) is in the maximum expansion state, a tensile load acting on the head bolts (12) on either side of the first region (A) can be suppressed to become equal to a tensile load acting on the other head bolts (12).

Description

technical field [0001] The present invention relates to a fixing structure of a cylinder head of a fluid pressure cylinder that performs expansion and contraction using working fluid pressure. Background technique [0002] JP09-151909A issued by the Japanese Patent Office in 1996 discloses a hydraulic cylinder that utilizes a plurality of cylinder head bolts (Head Bolt) to fix the cylinder head on the open end of the cylinder body. [0003] The hydraulic cylinder expands and contracts by selectively supplying hydraulic oil from the outside through piping to two oil chambers divided by the piston inside the cylinder. Piping to one of the oil chambers is connected to the cylinder head with fittings. Piping to the other chamber is connected to the base of the cylinder with a fitting. [0004] When the hydraulic cylinder reaches the maximum extension state, the piston abuts against the cylinder head to prevent further extension. In this state, when the cylinder head is presse...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B15/14
CPCF15B15/1438
Inventor 船户泰志
Owner KYB CORP