Cylinder protective cover and cylinder

Abstract

The invention relates to a cylinder protective cover, one end (2) of which is fixed near the front end of a piston rod (24) through a rod-side fixing mechanism (30), and the other end (3) is fixed through a cylinder-side fixing mechanism (30) On the cylinder (22), it includes: a slack absorption mechanism (wrinkle structure) (1) that absorbs the slack caused by the expansion and contraction of the piston rod; Truncation part (4).

Description

technical field [0001] The present invention relates to a cylinder guard for protecting a piston rod constituting a cylinder such as a hydraulic cylinder, a hydraulic cylinder, or a pneumatic cylinder, and a cylinder provided with the cylinder guard. Background technique [0002] As a prior art related to such a cylinder guard, there is, for example, the technology disclosed in JP 2001-241406 A (hereinafter referred to as patent document). This patent document discloses a technique of attaching a cover made of a flexible material such as cloth, rubber, or synthetic resin from the tip of the rod to the tip of the cylinder to cover the rod of the hydraulic cylinder. Here, when the protective cover of the cylinder rod is attached to the rod, it has a substantially cylindrical shape, and the outer diameter of the rod side of the cover is thinner, and the outer diameter of the cylinder side is thicker. Accordingly, when the rod shrinks, the small-diameter portion enters the larg...

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Problems solved by technology

[0005] Although the protection cover of the hydraulic cylinder disclosed in the above-mentioned patent document is intended to absorb the slack when the rod shrinks by gradually increasing the diameter from the rod front end side to the cylinder side, for example, when the cover is wetted by rain or the like, When it is cold or dry, the part where the cover is folded into a pleat due to the shrinkage of the rod may not be certain, and it is difficult to say that the slack can be fully absorbed depending on the situation.

That is, especially compared with the corrugated structure exemplified in the prior art as a patent document, the cover structure disclosed as an invention in the patent document cannot expect such a large effect on the slack of the cover when the rod is contracted.

[0006] On the other hand, although the protective cover of the substantially cylindrical corrugated structure mentioned in the prior art of the patent document can absorb slack, when installing on the rod, the rod must be detached from the member, and installation is very difficult. It is troublesome, and because the air stays inside, it expands when it shrinks, and there is a disadvantage of deteriorating the appearance.

Moreover, since the material of such a protective cover itself is thin, it has the disadvantage of being easily damaged when it comes into contact with stones, etc.

[0007] In addition, although it is not clearly described in the patent literature, when a corrugated structure is adopted, generally a reinforcing member such as a spring material or a steel wire is used for the large-diameter portion. This reinforcing member may be broken due to corrosion during use, and may further The cover itself is cracked due to this break

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