Pipe fixing structure for cylinder tube
The pipe fixing structure wherein the band has an arc-shaped cross-section of substantially 180 degrees and includes a joining hole in either circumferential direction end thereof, and by disposing a pair of the bands on the outer periphery of the cylinder tube such that the respective joining holes oppose each other and fastening the opposing joining holes together using a bolt and a nut, the bands are fixed to the outer periphery of the cylinder tube.
In a fluid pressure cylinder that drives a boom of a working machine, a working fluid pipe is fixed to a side face of a cylinder tube, for example. To prevent the pipe from vibrating, prevent looseness in a pipe connecting portion, and increase the compactness of a disposal space including the cylinder tube, the pipe is preferably disposed in close contact with the cylinder tube.
The pipe fixing structure proposed in the prior art includes a pair of bands fastened to the cylinder tube, and a sheet metal bracket welded to one of the bands. A block-shaped clamp is fixed to the bracket by a bolt and a nut. The pipe is sandwiched between the clamp and the bracket.
In this pipe structure, every time an attachment position for attaching the pipe to the cylinder tube and an outer diameter of the cylinder tube are modified, component dimensions and a welding position for welding the bracket to the band must be modified.
Further, since a block-shaped clamp is used, a diameter of the clamp must be increased when the diameter of the pipe is increased. As a result, increases occur in the size and weight of the pipe structure including the clamp and the bracket. Moreover, since the bracket is welded to the band, a thickness of the band must be increased to ensure that the band is not broken by an external force such as vibration. This also leads to an increase in the weight of the pipe structure.
It is therefore an object of this invention to realize a pipe fixing structure for a cylinder tube that is small and lightweight and can cope with a wide range of variation in a diameter of a cylinder tube and an attachment position of a pipe.
To achieve this object, this invention provides a pipe fixing structure that supports a pipe on a cylinder tube, comprising a band fastened to an outer periphery of the cylinder tube, the band comprising a first tab that projects outward in a radial direction and a second tab that projects outward in the radial direction, and a bracket that supports the pipe, wherein the bracket is formed with an inverted U-shaped cross-section constituted by a pair of leg plate portions and a top plate portion formed integrally with the leg plate portions to join the leg plate portions, and the pair of leg plate portions are fixed to the first tab and the second tab by a bolt.
This invention also provides a fluid pressure cylinder that supports a pipe on a cylinder tube, comprising a band fastened to an outer periphery of the cylinder tube, the band comprising a first tab that projects outward in a radial direction and a second tab that projects outward in the radial direction, and a bracket that supports the pipe, wherein the bracket is formed with an inverted U-shaped cross-section constituted by a pair of leg plate portions and a top plate portion formed integrally with the leg plate portions to join the leg plate portions, and the pair of leg plate portions are fixed to the first tab and the second tab by a bolt.
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