JPH0649923Y2 - Dust-proof cover in hydraulic cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a dustproof cover for a hydraulic cylinder.

(Prior Art) Hydraulic cylinders are used in various industrial machines such as construction machines, but in the environment of use, it is necessary to attach a dustproof cover to a piston rod that expands and contracts from the end of the cylinder.

A dustproof cover in a conventional hydraulic cylinder will be described with reference to FIG. In FIG. 4, the hydraulic cylinder 1 is
The cylinder 2 side is pivotally connected 9 to one member A of the two members A and B that are relatively rotatable, and the piston rod 4 is attached to the bracket 3 fixed to the other member B.
By pivotally connecting the tip end of the above with the shaft 5, it is interposed between the two members A and B. A dust-proof cover 6 is a cylindrical bellows which surrounds the hydraulic cylinder 1 and has one end attached to the outer circumference of the piston rod 4 and the other end attached to the outer circumference of the cylinder 2. The dust-proof cover (bellows) 6 is attached to the outer circumference of the piston rod 4 by tightening with a tightening band 7 on the outer circumference of the tip end of the piston rod 4 projecting from the end portion of the cylinder 2 on the piston rod side when the hydraulic cylinder 1 is in the most contracted state. It is done by that. The dustproof cover (bellows) 6 is attached to the outer circumference of the cylinder 2 by tightening the outer circumference of the cylinder 2 with a tightening band 8 in the same manner.

FIG. 4 used in the description of the prior art described above shows a dustproof cover of a boom hoisting cylinder in a crane vehicle or a work vehicle at a high place, and the above-mentioned one member A is a swivel base that is swivelably mounted on the vehicle. The other member B corresponds to a boom whose base end is rotatably and pivotally connected to the swivel base (one member) A.

(Problems of the prior art) The dustproof cover in the hydraulic cylinder configured as described above can prevent dust from adhering to the piston rod 4 that expands and contracts from the cylinder 2, but the dustproof cover (bellows).
Since one end of 6 is attached to the piston rod 4,
The hydraulic cylinder 1 must be configured so that one end of the dustproof cover (bellows) 6 can be attached to the piston rod 4 portion located between the end portion of the cylinder 2 on the piston rod side and the bracket 3 in the most contracted state of the hydraulic cylinder 1. I have to. This has the drawback that the effective stroke of the hydraulic cylinder 1 interposed in the limited space (between 5 and 9) is reduced accordingly.

An object of the present invention is to provide a dustproof cover for a new hydraulic cylinder that does not require one end of the dustproof cover to be attached to the piston rod 4 of the hydraulic cylinder, and thus solve the above-mentioned problems of the prior art. .

(Means for Solving Problems) The dustproof cover in the hydraulic cylinder of the present invention is configured as follows in order to achieve the above object.

The cylinder side is pivotally connected to one member of the two members that are relatively rotatably connected, and the tip end portion of the piston rod is pivotally connected to a bracket fixed to the other member. A dustproof cover in a hydraulic cylinder interposed between two members to relatively rotationally drive the two members, the bracket being pivotally connected to the tip end of the piston rod, or the other member near the bracket. A casing having an opening into which the piston rod side end of the cylinder of the hydraulic cylinder loosely fits when the hydraulic cylinder is at the minimum contraction, and the casing is externally fitted to the hydraulic cylinder so as to surround the hydraulic cylinder,
A dust-proof cover for a hydraulic cylinder, comprising: a cylindrical bellows, one end of which is connected to the opening of the casing and the other end of which is connected to a proper location on the outer circumference of the hydraulic cylinder.

(Operation) With the configuration described above, it is not necessary to attach one end of the dustproof cover to the piston rod of the hydraulic cylinder, and the piston rod of the hydraulic cylinder is attached to the piston rod side of the cylinder by the bracket to which the piston rod is pivotally connected. It can be reduced until it is located near the edge. Therefore, the effective stroke of the hydraulic cylinder is
It can be made larger than the conventional one.

(Embodiment) Next, an embodiment of the dustproof cover in the hydraulic cylinder of the present invention will be described with reference to FIG. A and B are two members configured to be rotatable relative to each other, and are the same as those described in the related art. Ten
Is a hydraulic cylinder provided with a cylinder 11 and a piston rod 12, and one member A is a cylinder of the hydraulic cylinder 10.
11 side is pivotally connected 13 and the tip of the piston rod 12 of the hydraulic cylinder 10 is pivotally connected by a shaft 15 to a bracket 14 fixed to the other member B, and is interposed between the two members AB. There is. Reference numeral 16 denotes a casing attached to the other member B so as to cover a part of the bracket 14 and the tip of the piston rod 12 of the hydraulic cylinder 10. As shown in FIG. 2, the casing 16 is constituted by a front wall 18, left and right side walls, a rear wall and a bottom wall in a box shape, and its opening side is abutted against the other member B for attachment. Has become. The left and right side walls, rear wall and bottom wall are integrally connected to form a casing body 17, and the front wall 18 is detachably attached to the casing body 17 with bolts 21 '. Further, notches 20 are provided on the rear wall of the casing body 17 so as not to interfere with the bracket 14 when the casing 16 is attached to the other member B, and the upper and left edges of the left and right side walls of the casing body 17 are shown in FIG. And the cross section attached to the other member B is L
A plurality of bolt holes 19 are provided so that the casing 16 can be bolted through the metal fitting 23. The front wall 18 has an opening in which the end of the hydraulic cylinder 10 on the piston rod 12 side of the cylinder 11 loosely fits, that is, even if the two members A and B relatively move due to the operation of the hydraulic cylinder 10, the hydraulic cylinder 10 An opening 21 is provided with a margin that does not interfere with the end of the cylinder 11 on the piston rod 12 side, and a collar 22 is provided around the opening 21.

The casing 16 configured as described above is used for the hydraulic cylinder 10.
The end portion of the cylinder 11 of the hydraulic cylinder 10 adjacent to the bracket 14 on the side of the piston rod 12 is fitted into the bracket 14 when fully reduced. 24 is a cylindrical bellows,
One end of the hydraulic cylinder is inserted into the collar 22 with the hydraulic cylinder inserted therein, and is fixed by tightening with a tightening band 25. The other end of the bellows 24 is fixed to the outer periphery of the cylinder 11 of the hydraulic cylinder 10 by tightening it with a tightening band 26 by reducing the bellows 24 to the minimum when the hydraulic cylinder 10 is contracted to the minimum.

The dustproof cover in the hydraulic cylinder configured as described above functions as follows. When the hydraulic cylinder 10 is contracted, the piston rod 12 is surrounded by the casing 16 as shown in FIG. Also hydraulic cylinder
As the piston rod 12 is extended and protrudes to the outside with the extension of 10, the bellows 24 is extended with the extension of the piston rod 12, and is surrounded by the bellows 24 and the casing 16. Therefore, regardless of the operation of the hydraulic cylinder 10, the piston rod 12 is always prevented from adhering dust. As in the case described in the prior art, one end of the bellows (dustproof cover) is not attached to the piston rod 12, but the casing 16 is provided and attached to the piston rod 12.
The bracket 14 pivotally connected to the hydraulic cylinder 10 can be reduced until it is located near the end of the cylinder 11 of the hydraulic cylinder 10 on the piston rod 12 side, and the effective stroke of the hydraulic cylinder can be increased.

Further, even when the end portion of the hydraulic cylinder 10 on the piston rod 12 side of the hydraulic cylinder 10 is close to the lower surface of the other member B when the hydraulic cylinder 10 is contracted to the minimum size, the adjacent portion is close to the casing 16.
Since it is surrounded by, the bellows 24 can be attached at a place where the gap is relatively large while avoiding this part.

(Effect of the Invention) Since the present invention is configured and operates as described above,
When attaching the dustproof cover to the hydraulic cylinder, it is not necessary to attach one end of the dustproof cover to the piston rod of the hydraulic cylinder, and the effective stroke of the hydraulic cylinder can be increased, which is a great effect. Further, the present invention can be applied to a hydraulic cylinder in which the end of the hydraulic cylinder on the piston rod side is close to the other member when the hydraulic cylinder is contracted to its minimum.

[Brief description of drawings]

1 to 3 are explanatory views of a dustproof cover in a hydraulic cylinder according to the present invention, and FIG. 4 is an explanatory diagram of a dustproof cover in a conventional hydraulic cylinder. 10; hydraulic cylinder, 11; cylinder, 12; piston rod, 1
4; bracket, 16; casing, 24; bellows

Claims (1)

[Scope of utility model registration request] 1. A cylinder member is pivotally connected to one member of two members which are relatively rotatably connected, and a tip end portion of a piston rod is pivotally connected to a bracket fixed to the other member. A dustproof cover in a hydraulic cylinder, which is connected and interposed between the two members to relatively rotationally drive the two members, the bracket being pivotally connected to the tip end of the piston rod, or the bracket vicinity thereof. And a casing having an opening to which the end of the hydraulic cylinder on the piston rod side of the hydraulic cylinder is loosely attached when the hydraulic cylinder is fully contracted, and the external cylinder is fitted onto the hydraulic cylinder so as to surround the hydraulic cylinder. Is
A dust-proof cover for a hydraulic cylinder, comprising: a cylindrical bellows, one end of which is connected to the opening of the casing and the other end of which is connected to a proper location on the outer circumference of the hydraulic cylinder.