JP2002061609A - Connecting structure of cylinder and connecting method for cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting structure of a cylinder dispensing with additional machining. SOLUTION: Two cylinders 21, 31 are connected to each other with the head side end faces 21b, 31b of the respective cylinders 21, 31 abutting on each other by a connecting member 51 and a hexagon socket head cap screw 61. The connecting member 51 is formed like a rod having a step formed by a small-diameter part 52 and a large-diameter part 53. The small-diameter part 52 is formed to have the substantially same length as a female screw part 24b, and a male screw part 54 screw-engaged with the female screw part 24b is formed thereon. The large-diameter part 53 is formed like a hexagonal rod, and formed to have the length two times as large as the depth of a recessed part 23b, and a screw hole 55 with a diameter smaller than those of through holes 25, 35 is formed. A male screw part 62 of the hexagon socket head cap screw 61 is formed with a diameter smaller than those of the through holes 25, 35. The head 63 of the bolt 61 is formed to be accommodated in a recessed part 33a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder coupling structure and a cylinder coupling method.

[0002]

2. Description of the Related Art Conventionally, a pneumatic cylinder having a structure shown in FIG. 4, for example, is known. In cylinder 1,
A piston rod 2 is provided to be able to reciprocate. A part of the piston rod 2 protrudes from the end surface 1a of the cylinder 1 to the outside of the cylinder 1. Hereinafter, cylinder 1
In the axial direction, the projecting side of the piston rod 2 is called a “rod side”, and the opposite side of the rod side is called a “head side”.

In the periphery of each end face 1a, 1b of the cylinder 1, four recesses 3a, 3b each having a substantially circular cross section are formed, and the recess 3a of the rod side end face 1a and the head side end face 1a are formed.
The two concave portions 3b are arranged coaxially with each other so as to form a pair. On the bottom surface of each of the recesses 3a, 3b, female screw portions 4a, 4b having a smaller cross-sectional diameter than the recesses 3a, 3b are formed in the axial direction. A female screw portion 4a on the rod side;
A through hole 5 having a smaller diameter than the female screw portions 4a and 4b is formed between the female screw portions 4b on the head side facing each other.

When the cylinder 1 is mounted on a support 10 such as a bracket, the rod-side end surface 1a of the cylinder 1 is
The bolt 11 is inserted into the recess 3a on the rod side of the cylinder 1 from the surface of the support portion 10 which is not in contact with the cylinder 1 and the male screw portion 12 of the bolt 11 is And the female screw part 4a on the side. The cylinder 1 is fixed to the support section 10 by fixing the end face 1b on the head side to the support section 1 as shown by a two-dot chain line in FIG.
In some cases, the bolts 11 are brought into contact with the bolts and fastened with bolts 11.

[0005] Next, a description will be given of a conventional coupling structure in the case where two cylinders having the above-described configuration are used in series in the axial direction. As shown in FIG. 5, the two cylinders are joined in a state where the end faces on the head side of the respective cylinders are in contact with each other and the concave portions are opposed to each other. For convenience, the left cylinder is referred to as a first cylinder 21 and the right cylinder is referred to as a second cylinder 31 in FIG.

In the second cylinder 31, the diameter and depth of the concave portion on the rod side are enlarged, and a concave portion 36 is newly formed.
Further, the diameters of both female screw portions and the through holes of the second cylinder 31 are enlarged, and a hole 37 is newly formed.

From the rod side of the second cylinder 31 on which the above-mentioned additional processing has been performed, a commercially available hexagon socket head bolt 41
Is inserted, and the male screw portion 42 of the bolt 41 is screwed into the female screw portion 24b on the head side of the first cylinder 21. The head 43 of the bolt 41 is housed in the recess 36 and the head 4
3 and the bottom surface of the concave portion 36 are in contact with each other,
31 is fixedly connected. Fastening by the bolts 41 is performed at a plurality of places, and the two cylinders 21 and 31 are securely connected without shifting.

[0008]

However, the bolt 41
When additional processing is performed on the second cylinder 31 to insert
Increases cost. Further, when the cylinder is replaced, for example, when the stroke is changed, additional work is required each time, which increases the cost. For the user, the additional work must be separately requested to a contractor, which increases the cost.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a cylinder coupling structure and a cylinder coupling method that do not require additional processing.

[0010]

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that the female screw portion into which a bolt is screwed when fixing the cylinder to a support portion such as a bracket is provided. A plurality of sets are provided in a pair on both sides in the axial direction of the cylinder, and a through-hole smaller than the diameter of the female screw portion is formed coaxially with the female screw portion forming each pair, and both ends of the cylinder are provided. In a cylinder coupling structure in which a concave portion having a diameter larger than the diameter of each female screw portion is formed at a position corresponding to each female screw portion, two of the cylinders, the axial end surfaces thereof abut, and the contact surface side The coupling member is disposed so that the concave portions face each other, and includes a male screw portion screwed to the female screw portion of the first cylinder, and a screw hole into which a bolt is screwed from the second cylinder side. Fixed to the first cylinder, And summarized in that screwed bolts from protruding side or the opposite side thereof to the screw hole of the coupling member of the second cylinder piston rod to fix the two cylinders.

According to the present invention, the male screw portion of the connecting member is screwed and fixed to the female screw portion of the first cylinder, and the screw hole of the connecting member is fitted to the projecting side of the piston rod of the second cylinder or the opposite side. The male thread portion of the bolt inserted into the through hole from the side is screwed together to couple the two cylinders. Since the coupling member is interposed between the two cylinders, the male screw portion of the bolt penetrating the second cylinder is screwed into the screw hole even if the overall length is short. Therefore, the two cylinders are joined without additional processing of the second cylinder.

According to a second aspect of the present invention, in the cylinder coupling structure according to the first aspect, the coupling member is configured such that when the male thread is screwed into the female thread of the first cylinder, The gist is that a part of the portion having the screw hole protrudes outside the first cylinder. According to the present invention, the screw hole is formed long, and the screw hole and the male screw portion of the bolt are screwed at a long distance. Therefore, the coupling between the coupling member and the bolt is further strengthened, and the two cylinders can be more firmly coupled.

According to a third aspect of the present invention, a plurality of sets of female screw portions into which bolts are screwed when the cylinder is fixed to a support portion such as a bracket are provided on both sides in the axial direction of the cylinder. And a through hole smaller than the diameter of the female screw portion is formed coaxially with the female screw portion forming each pair, and larger than the diameter of each female screw portion at a position corresponding to each female screw portion at both ends of the cylinder. In a method for connecting cylinders having concave portions having a diameter, two cylinders are arranged such that their axial end surfaces are in contact with each other and the concave portions on the contact surface side are opposed to each other. A coupling member provided with a screw hole into which a bolt is screwed from the side is fixed to the first cylinder, and a bolt is screwed into the screw hole of the coupling member from the projecting side of the piston rod of the second cylinder or the opposite side. Together And summarized in that to secure the. According to this invention, similarly to the first aspect of the present invention, two cylinders can be connected at low cost without additional processing by using a connecting member.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The same parts as those in the related art are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 1, two cylinders 21,
31 is an end surface 21 on the head side of each of the cylinders 21, 31.
In a state where b and 31b are in contact with each other, they are connected by a connecting member 51 and a bolt 61 having a hexagonal hole.

As shown in FIG. 2, the coupling member 51 is formed in a rod shape having a step formed by a small diameter portion 52 and a large diameter portion 53. The small diameter portion 52 is formed to have substantially the same length as the female screw portion 24b, and has a male screw portion 54 screwed to the female screw portion 24b. The large diameter portion 53 is formed in a hexagonal column shape, has a length approximately twice as long as the depth of the concave portion 23b, and has a screw hole 55 smaller in diameter than the through holes 25 and 35.

The bolt 61 is formed one size smaller than the bolt 41 as a whole, and the male screw portion 62 of the bolt 61 is formed smaller in diameter than the through holes 25 and 35. The head 63 of the bolt 61 is formed in a size that can be accommodated in the recess 33a. A commercially available product is used for the bolt 61.

When the two cylinders 21 and 31 are connected to each other, the male screw portion 54 of the connecting member 51 is attached to the female screw portion 24b.
Are screwed and fixed. The large diameter portion 53 is
And the recess 33b are accommodated in a space created by the recess.

The bolt 61 is inserted from the rod side of the second cylinder 31, and the male screw portion 62 is screwed into the screw hole 55 and fixed to the connecting member 51. The head 63 is the concave portion 33a
The head 63 and the bottom surface of the concave portion 33a are in contact with each other, and the two cylinders 21 and 31 are fixed. Fastening is performed by a plurality of (four in this embodiment) coupling members 51 and bolts 61, and both cylinders 2
1, 31 are securely connected without shifting.

Next, the procedure of the above connection will be described. First, the coupling member 51 is inserted into each concave portion 23b from the male screw portion 54 side, and the male screw portion 54 is screwed and fixed to each female screw portion 24b. A plurality of connecting members 51 to the first cylinder 21
After mounting, the large-diameter portion 53 of each coupling member 51 and the concave portion 33b are arranged so as to face each other, and each large-diameter portion 53
While the protrusion from the first cylinder 21 is accommodated in the concave portion 33b, the head-side end surfaces 21 of both cylinders 21 and 31 are accommodated.
b and 31b are brought into contact with each other.

Next, the bolt 61 is inserted from the rod side of the second cylinder 31. The male screw portion 62 of the bolt 61 and the female screw portion 24b are screwed together, the head 63 of the bolt 61 and the bottom surface of the concave portion 33a are brought into contact with each other, and the cylinders 21 and 31 are tightened and fixed by the bolt 61. Each of the plurality of connecting members 51 is fastened by bolts 61, and both cylinders 2
1, 31 are securely connected to each other.

As described in detail above, according to this embodiment, the following effects can be obtained. (1) The coupling member 5 can be used without performing any additional processing on the second cylinder 31.
1 and the bolt 61 are fastened to the two cylinders 21 and 31
Can be combined.

(2) Since a commercially available bolt 61 with a hexagonal hole can be used, it is not necessary to manufacture a new bolt.
Both cylinders 21, 31 can be connected at lower cost.
(3) Since the large-diameter portion 53 of the coupling member 51 is formed in a hexagonal column shape, it can be easily rotated while being clamped by a jig such as a spanner at the time of attachment.

(4) The connecting member 51 is provided in the first cylinder 21
When the large diameter portion 53 is attached to the first cylinder 2
1 protrudes from the end face 21b of the first cylinder 2
Positioning when the first and second cylinders 31 contact each other can be easily performed.

(5) Since the large-diameter portion 53 does not protrude from the end surface 21b and the screw hole 55 is formed longer than when the large-diameter portion 53 is accommodated in the concave portion 23b, the fastening of the bolt 61 to the male screw portion 62 is firmly performed. it can.

(6) The screw hole 55 is formed smaller in diameter than the through holes 25 and 35, and the large diameter portion 53 is formed larger in diameter than the male screw portion 54. The strength of the portion 53 is maintained.

(7) Since the head 63 is housed in the recess 33a and does not protrude from the end face 31a to the outside of the second cylinder 31, it is necessary to make sure that the end face 31a is in contact with the plane of a support portion such as a bracket. Do not hinder.

The embodiment is not limited to the above-described embodiment, and may be modified as follows, for example. The configuration is not limited to the configuration in which the end surfaces on the head side are in contact with each other, and the configuration may be such that the end surface on the head side and the end surface on the rod side are in contact. For example, as shown in FIG. 3, the end surface 21b of the first cylinder 21 having a large stroke and the end surface 31a on the rod side of the second cylinder 31 having a small stroke may be joined together. In this case, the axial length of the first cylinder 21 is about twice that of the second cylinder 31.
On the end face 21b side, a screw hole 27 is formed as a through hole communicating with the pressure chamber 26 in the first cylinder 21.
The screw hole 27 is formed so that the rod 32a of the second cylinder 31 can be inserted therein, and an annular groove 28 is formed in the end face 21b around the screw hole 27, and a packing (O-ring) 29 is formed in the groove 28. Are arranged. Packing 29
Is in close contact with the end face 31a and does not leak the air in the pressure chamber 26 to the outside.

According to this connection configuration, the first cylinder 2
One rod 22a is operated in two ways. First,
In the first method, first, the piston 32b of the second cylinder 31 is operated to move the piston 32b from the head side to the rod 32a side. The piston 22b of the first cylinder 21 is pushed by the rod 32a,
The cylinder 21 is moved to an intermediate position in the axial direction. Next, the piston 22b is operated to move the piston 22b from the intermediate position to the rod 22a side.

Conversely, when returning the piston 22b from the rod 22a side to the head side, first, the piston 22b is operated to move the piston 22b to the intermediate position, and the piston 32b is operated to operate the piston 32b.
Is moved from the rod 32a side to the head side. Next, the piston 22b is operated to move the piston 22b toward the head. As described above, the rod 22a
Is moved by a two-stage stroke.

Next, in the second method, only the piston 22b is operated without operating the piston 32b, and the rod 2
2a is moved by one-step stroke. The connection between the two cylinders 21 and 31 is released and the first cylinder 21
When used alone, the lid 71 shown by a two-dot chain line in FIG. 3 is brought into close contact with the packing 29 in order to prevent the air in the pressure chamber 26 from leaking to the outside. A male screw (not shown) of the lid 71 is screwed into the screw hole 27, and
Is sealed.

The connecting member 51 may be constituted only by the large diameter portion 53 in which the screw hole 55 is formed without forming the male screw portion 54. In this case, for example, the large diameter portion 53 may be fixed in the concave portion 23b with an adhesive or the like, and the screw hole 55 may be a through hole.

When the large-diameter portion 53 is attached to the first cylinder 21, a part of the large-diameter portion 53
It is not necessary to project from one. The large diameter portion 53 may be a polygonal column instead of a hexagonal column. Even in this case, at the time of attachment, it is easy to pinch and rotate with a jig such as a spanner.

The large diameter portion 53 is not limited to a polygonal columnar shape, but may be a substantially cylindrical shape or another shape. -The coupling member 51 may be formed with the same diameter over the entire length. Next, technical ideas other than those described in the claims that can be understood from the above embodiments will be described below.

(1) In the invention according to any one of the first to third aspects, the portion having the screw hole of the coupling member is formed in a polygonal column shape. (2) In the invention described in claim 3 or the technical idea (1), in the coupling member, the external thread portion is the first thread portion.
When screwed into the female screw portion of the first cylinder, a portion having a screw hole is formed in such a size as to protrude outside the first cylinder.

(3) In the invention according to any one of claims 1 to 3 or the technical concept (1) or (2), the two cylinders have end faces opposite to each other on the side opposite to the projecting side of the piston rod. Abut.

(4) In the invention according to any one of claims 1 to 3, or the technical concept (1) or (2), the end face of the second cylinder, on the projecting side of the piston rod, is the second cylinder. A through-hole is formed in the end surface of the first cylinder, which is in contact with the end surface of the first cylinder opposite to the protruding side of the piston rod, and for accommodating the protrusion of the piston rod of the second cylinder. An annular groove is formed in an end surface of the first cylinder, and a packing for preventing fluid leakage from a joint surface of the two cylinders is provided in the groove.

[0038]

As described in detail above, according to the first to third aspects of the present invention, two cylinders can be connected without additional processing.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a coupling structure of two cylinders.

2A is a partially cutaway side view of a coupling member, and FIG. 2B is a front view.

FIG. 3 is a partially cutaway side view showing another example of a coupling structure of two cylinders.

FIG. 4 is a partially cutaway side view of a structure for attaching one cylinder to another member.

FIG. 5 is a partially cutaway side view showing a conventional coupling structure of two cylinders.

[Explanation of symbols]

1, 21, 31 ... cylinder, 1a, 1b, 21b, 31
a, 31b ... end face, 2 ... piston rod, 3a, 3b,
23b, 33a, 33b ... recesses, 4a, 4b, 24b ...
Female thread part, 5, 25, 35 ... through hole, 10 ... support part, 1
1, 61: bolt, 51: coupling member, 53: large diameter portion as a portion having a screw hole, 54: male screw portion, 55: screw hole.

Claims (3)

[Claims] A plurality of sets of female screw portions into which bolts are screwed when fixing the cylinder to a support portion such as a bracket are provided in a pair on both sides in the axial direction of the cylinder. A through-hole smaller than the diameter of the female screw portion was formed coaxially with the female screw portion, and a concave portion having a diameter larger than the diameter of each female screw portion was formed at a position corresponding to each of the female screw portions at both ends of the cylinder. In the coupling structure of the cylinders, two of the cylinders, the end faces in the axial direction thereof abut,
And a male screw portion that is arranged so that the concave portions on the contact surface side face each other, and is screwed to the female screw portion of the first cylinder;
A coupling member provided with a screw hole into which a bolt is screwed from the second cylinder side, and fixed to the first cylinder;
A coupling structure for fixing both cylinders by screwing a bolt into the screw hole of the coupling member from the protruding side of the piston rod of the cylinder or the opposite side. 2. The coupling member, wherein when the male screw portion is screwed into the female screw portion of the first cylinder, a part of a portion having a screw hole projects outside the first cylinder. The cylinder coupling structure according to claim 1. 3. A plurality of sets of female screw portions into which bolts are screwed when fixing the cylinder to a support portion such as a bracket are provided in pairs on both sides in the axial direction of the cylinder. A through-hole smaller than the diameter of the female screw portion was formed coaxially with the female screw portion, and a concave portion having a diameter larger than the diameter of each female screw portion was formed at a position corresponding to each of the female screw portions at both ends of the cylinder. In the method of joining cylinders, two cylinders, end faces of which contact each other in the axial direction,
And a coupling member having a screw hole into which a bolt is screwed from the second cylinder side is fixed to the first cylinder, with the concave portions on the contact surface side facing each other. A method of coupling cylinders, wherein a bolt is screwed into a screw hole of the coupling member from a protruding side of the piston rod or a side opposite thereto to fix both cylinders.