JP2562976Y2 - Hydraulic cylinder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a hydraulic cylinder in which a long pipe body such as an oil passage is provided.

[0002]

2. Description of the Related Art Conventionally, a hydraulic cylinder having a structure as shown in FIG. 7 has been provided as a hydraulic cylinder in which a long pipe body such as an oil passage is provided.

A conventional hydraulic cylinder comprises a cylinder body 1 serving as one end member, a rod body 2 serving as the other end member and inserted into and out of the cylinder body 1, A piston body 3 connected to the body 2 and sliding within the cylinder body 1.

The rod body 2 is formed in a so-called hollow structure having a hollow portion 2a therein, and a long pipe body 4 having an oil passage inside the hollow portion 2a.
It is arranged.

The pipe body 4 has one end welded to one end of a cap member 5 connected to the base end of the rod body 2 and the other end fitted to one end side of the piston body 3. The inside of the pipe body 4 communicates with an external oil pressure source (not shown) through a port 5a opened in the cap member 5 and the inside of the cylinder body 1 through a port 3a opened in the piston body 3. Communicates with a piston-side oil chamber R1 defined by the piston body 3.

On the other hand, a rod-side oil chamber R2 defined by the piston body 3 in the cylinder body 1 is communicated with a hollow portion 2a in the rod body 2 through a communication hole 2b opened in the rod body 2. I have.

The hollow portion 2a is provided with a cap member 5
Is connected to an external hydraulic pressure source through a port 5b separately drilled.

Further, the pipe body 4 is formed, for example, in a donut shape at an appropriate position on the outer periphery thereof,
When the pipe body 4 is housed in the hollow portion 2a inside the rod body 2 due to the arrangement of the spacer member 6, the spacer member 6 shakes or buckles at the intermediate portion. Or to prevent it.

In the spacer member 6, a hole 6a is appropriately formed in the spacer member 6 to ensure the flow of hydraulic oil.

Therefore, according to the conventional hydraulic cylinder, an external oil pressure is supplied to the piston side oil chamber R1 defined in the cylinder body 1 via the pipe body 4. , The extension operation becomes possible, and conversely,
By supplying an external oil pressure into the rod-side oil chamber R2 via the hollow portion 2a in the rod body 2, its compression operation becomes possible.

A spacer member 6 is provided on the outer periphery of the pipe body 4.
Are appropriately arranged, so that the middle portion of the pipe body 4 is in the hollow portion 2a in the rod body 2 during the expansion / contraction operation of the hydraulic cylinder.
It will not sway or buckle within.

[0012]

However, in the above-mentioned conventional hydraulic cylinder, there is a disadvantage that the productivity cannot be improved.

That is, in the above-described conventional hydraulic cylinder, since the spacer member 6 is disposed on the outer periphery of the pipe body 4 and is fixed at a predetermined position by welding by the welding portion A, From the welding portion A, welding spatter and oxide scale are generated.

If the cleaning and removal of the welding spatter and the oxide scale are incomplete, they will be mixed into the hydraulic oil during the subsequent use of the hydraulic cylinder, and the normal operation of the hydraulic cylinder is expected. There is a fear that it will not be possible.

Therefore, it is required that the cleaning and removal of the welding spatter and the oxide scale be completely performed. As a result, the operation requires a great amount of time and labor, and the hydraulic cylinder needs to be removed. Productivity is not improved.

The present invention has been made in view of the above circumstances, and has as its object to improve the productivity of a hydraulic cylinder in which a long pipe, such as an oil passage, is provided. It is to be optimal to expect improvement.

[0017]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the structure of the present invention comprises a cylinder body, a rod body which is inserted into and retractable from the cylinder body, and which is connected to the rod body. A piston body that slides in the cylinder body, and the rod body has a long pipe body in a hollow portion inside the piston body, and the pipe body is disposed at an appropriate position on the outer periphery thereof. In a hydraulic cylinder housed in the hollow portion under the arrangement of the provided spacer member, the spacer member is formed in a structure that allows passage of hydraulic oil, and the spacer member is applied to a pipe body. It is arranged at a predetermined position of the pipe body by a deforming process performed on the spacer member.
The spacer member is formed, for example, in a substantially triangular shape or a substantially star shape having an outer diameter substantially matching the inner diameter of the hollow portion of the rod body, and the spacer member is formed in a substantially triangular shape. In some cases, the pipe body is disposed at a predetermined position of the pipe body by deformation processing, and when the spacer member is formed in a substantially star shape, a predetermined processing of the pipe body is performed by the deformation processing performed on the spacer member. Suppose you are located at a location.

[0018]

Therefore, when arranging the spacer member on the outer periphery of the pipe body provided in the hollow portion of the rod body, welding by the welding portion is not used, so that the welding spatter or oxide scale is formed on the outer periphery of the pipe body. This eliminates the need for cleaning and removing the welding spatter and oxide scale.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. The hydraulic cylinder in the present invention is basically the same as the conventional hydraulic cylinder (see FIG. 7).
It is configured similarly to.

Accordingly, the same parts in the structure are denoted by the same reference numerals in the drawings, and detailed description thereof will be omitted.
Hereinafter, different parts of the present invention will be mainly described.

That is, in the hydraulic cylinder according to the present invention, the spacer member 6 disposed on the outer periphery of the pipe body 4 is provided.
Is formed in a substantially triangular shape having an outer diameter substantially coinciding with the inner diameter of the hollow portion 2a of the rod body 2, as shown in FIG. 1, and a through hole 6b through which the pipe body 4 is loosely inserted at the center thereof.
Has been pierced.

The spacer member 6 has a substantially arcuate space portion 6c between the spacer member 6 and the rod body 2 provided adjacently on the outer peripheral side.
And the space 6c is set for circulation of hydraulic oil.

On the other hand, in this embodiment, the spacer member 6 is disposed at a predetermined position on the outer periphery of the pipe body 4 by deforming the pipe body 4 after the spacer member 6 is interposed in the pipe body 4. It is assumed that the pipe 4
As shown in FIG. 2, the state of the deformation is that the protruding deformation part 4a protruding in one of the diametrical directions, which is the vertical direction in the figure, is formed, and the depressed deformation recessed in the other diametrical direction perpendicular to the one diametrical direction. It is assumed that the portion 4b is formed.

As a result, the spacer member 6 is sandwiched by the projecting deformation portions 4a from so-called both sides, and is disposed at a predetermined position.

By the way, regarding the deformation processing performed on the pipe body 4, in this embodiment, it is assumed that this is realized by the method shown in FIGS.

To explain a little, the deformation processing performed on the pipe body 4 is realized by using a jig 10, and the jig 10 includes a holding portion 11 positioned so-called outside,
A press part 12 positioned inside the holding part 11,
Having.

The holding section 11 and the press section 12
Are a pair of right and left arranged so as to sandwich the spacer member 6 and a pair arranged so as to sandwich the pipe body 4 from the diametrical direction of the pipe body 4.

The holding portion 11 is formed in a so-called chuck structure so as to securely hold the pipe body 4 without deforming the pipe body 4 when the pipe body 4 is held. 4 has a concave portion 11a having a semicircular cross section formed to have an inner periphery coinciding with the outer periphery.

On the other hand, the pressing section 12 is configured to deform the pipe body 4 when the pipe body 4 is pinched, that is, to form the depression deformation section 4b which is recessed in the diameter direction of the pipe body 4. The recess 12a has a so-called recessed portion 12a having a larger width and a semi-circular cross-section than that of the recessed portion 11a having a semicircular cross-section in the holding portion 11.

Therefore, in the jig 10, as shown by an imaginary diagram in FIG. 3, while holding the pipe body 4 by the holding portion 11, as shown by an arrow in FIG. Press part 1
By pressing the pipe body 4 with 2, predetermined deformation processing can be performed on the pipe body 4.

That is, at this time, in the pipe body 4, as shown in FIG. 4, the depression portion 4b is formed at the portion pressed by the press portion 12, and at the portion displaced by 90 degrees from the depression portion 4b. As a result, the projecting deformation portion 4a is formed as a so-called escape of the above-mentioned depression deformation (see FIG. 5).

As a result, the projecting deformation portion 4a sandwiches the spacer member 6 from the so-called left and right sides, and the fixing of the spacer 6 member to the outer periphery of the pipe body 4 is realized.

At this time, a part of the escape extends to a portion adjacent to the inner periphery of the spacer member 6 of the pipe body 4, so that the spacer member 6 prevents even its rotation. The state is fixed to the outer periphery of the pipe body 4 in such a state.

FIG. 6 shows another embodiment of the spacer member 6. The spacer member 6 is formed in a substantially star shape having an outer diameter substantially matching the inner diameter of the hollow portion 2a of the rod body 2. The spacer member 6 is arranged at a predetermined position on the outer periphery of the pipe body 4 by deformation processing.

Therefore, in this embodiment, the spacer 6
The member is formed to have an annularly deformed portion 6d having a through hole 6b at the center, and a plurality of support portions 6e extending outward from the deformed portion 6d.

In the case of this embodiment, the deformed portion 6d is bent inward at the center thereof by using an appropriate jig, so that the deformed portion 6d can be contracted.
The spacer member 6 can be formed without deforming the pipe body 4.
Can be arranged on the outer periphery of the pipe body 4.

In the case of this embodiment, a continuous groove (not shown) having a fine cross section may be provided on the inner periphery of the deformed portion 6d forming the through hole 6b. Can be formed in the above-described embodiment.

Therefore, as described above, the spacer member 6
Is provided in the hydraulic cylinder having the pipe body 4 in which the hydraulic pressure is supplied from an external hydraulic source into the piston side oil chamber R1 in the cylinder body 1 so that the hydraulic cylinder is extended. At the same time, when hydraulic pressure is supplied from an external hydraulic pressure source to the rod-side oil chamber R2 in the cylinder body 1, the hydraulic cylinder contracts.

The pipe body 4 which allows the passage of hydraulic oil during the expansion and contraction operation of the hydraulic cylinder is swung in the hollow portion 2a in the rod body 2 by the spacer member 6 disposed on the outer periphery thereof. They will not be moved or buckled.

Further, since the spacer member 6 is not disposed on the outer periphery of the pipe body 4 by welding at the welded portion A (see FIG. 7) as in the conventional example, welding spatter and oxidized scale are not generated. It does not occur and therefore does not even need to consider its cleaning and removal operations.

[0041]

As described above, according to the present invention, when the spacer member is arranged on the outer periphery of the pipe body, the spacer member is not welded by the welding portion because it is deformed into the pipe body or the space member. Spatters and oxide scales are not generated. Therefore, there is no need to consider the cleaning and removing work. This makes it possible to reduce the number of working steps, thereby improving productivity and reducing product cost. There is.

When the spacer member is arranged on the outer periphery of the pipe body by deforming the space member, there is an advantage that the pipe body is not deformed and the flowability of the hydraulic oil passing through the inside is not hindered. is there.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a spacer member.

FIG. 2 is a partial cross-sectional view showing a state in which a spacer member is provided on an outer periphery of a pipe body.

FIG. 3 is a partial cross-sectional view showing a state in which a jig is provided for a pipe member provided with a spacer member interposed therebetween.

FIG. 4 is a partial sectional view showing a use state of the jig.

FIG. 5 is a partial cross-sectional front view showing a state in which a spacer member is disposed on the outer periphery of the pipe body due to deformation of the pipe body.

FIG. 6 is a front view showing another embodiment of the spacer member.

FIG. 7 is a cross-sectional view showing a hydraulic cylinder as a conventional example, partially cut away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder body 2 Rod body 2a Hollow part 3 Piston body 4 Pipe body 6 Spacer member

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-52-16566 (JP, A) JP-A-54-14081 (JP, A) JP-A 1-132806 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A rod body, comprising: a cylinder body; a rod body that is inserted into and retractable from the cylinder body; and a piston body that is connected to the rod body and slides in the cylinder body. Has a long pipe body in a hollow portion inside thereof, and the pipe body is housed in the hollow portion under the presence of a spacer member disposed at an appropriate position on the outer periphery thereof. In the cylinder, the spacer member is formed in a structure that allows the passage of hydraulic oil, and the spacer member is deformed on the pipe body or a predetermined position of the pipe body by deformation processing performed on the spacer member. A hydraulic cylinder characterized by being disposed in a hydraulic cylinder.