WO2015194065A1

WO2015194065A1 - Connecting unit and connected cylinder

Info

Publication number: WO2015194065A1
Application number: PCT/JP2014/080887
Authority: WO
Inventors: 中島　美明
Original assignee: 株式会社コガネイ
Priority date: 2014-06-18
Filing date: 2014-11-21
Publication date: 2015-12-23
Also published as: TW201600737A; JP2016003732A

Abstract

This connected cylinder is configured from connecting, in the axial direction by means of a connecting unit, a first cylinder (11) provided with a first cylinder hole (13) and a second cylinder (21) provided with a second cylinder hole (23). The connecting unit has a plurality of connecting pins (40), and the connecting pins (40) are each inserted into a pin housing hole (37). The pin housing hole (37) is formed from a first connecting hole (36a) parallel to the cylinder hole (13) and a plurality of second connecting holes (36b) parallel to the cylinder hole (23). The connecting pins (40) are provided with a first and second tapered surface (45, 46), a first screw member (47) is pressed against the tapered surface (45), and a second screw member (48) is pressed against the tapered surface (46).

Description

Connecting unit and connecting cylinder

The present invention relates to a connecting unit for connecting two cylinders in the vertical direction and a connecting cylinder using the connecting unit.

¡Multi-position cylinders and dual stroke cylinders are the types of cylinders that connect multiple cylinders in the vertical direction. The multi-position cylinder has a first cylinder provided with a first piston rod projecting outside, and a second cylinder provided with a second piston rod abutted against the first piston rod. is doing. On the other hand, the dual stroke cylinder has a first cylinder provided with a first piston rod projecting outside, and a second cylinder provided with a second piston rod projecting outside, The first piston rod and the second piston rod protrude in opposite directions.

In the multi-position cylinder, the first piston rod can be positioned at the intermediate position by the second piston rod. Further, in the multi-position cylinder, when the thrust of the second piston rod is applied to the first piston rod, the first piston rod is driven with twice the thrust. When driving the first piston rod with double thrust, both piston rods are actuated with the same reciprocating stroke.

On the other hand, in a dual stroke cylinder, each piston rod is driven independently. Furthermore, in this dual stroke cylinder, a three-stage stroke is obtained as a whole by fixing one piston rod.

Non-Patent Document 1 describes a multi-position cylinder and a tandem cylinder as such a connected cylinder.

In conventional multi-position cylinders and dual stroke cylinders, the mounting holes penetrate the cylinder walls of the first cylinder and the second cylinder in the axial direction. Further, a nut is mounted in the mounting hole of one cylinder wall, and a bolt screwed into the nut is mounted in the mounting hole of the other cylinder wall. Bolts for fastening the two cylinders are respectively provided at the four corners of the cylinder wall. Therefore, in order to connect a long cylinder, a long mounting hole must be formed in the cylinder wall, and the connecting cylinder cannot be manufactured efficiently. Also, since the length of the bolt is limited, a long cylinder cannot be fastened. In addition, in a small connecting cylinder having a small piston diameter, it is difficult to manufacture a small connecting cylinder because the space of the mounting hole cannot be provided in the cylinder wall in the axial direction.

An object of the present invention is to improve the manufacturing efficiency of a coupled cylinder.

Another object of the present invention is to enable downsizing of the coupled cylinder.

The connecting unit of the present invention is provided with a first cylinder provided with a first cylinder hole for guiding the first piston in the axial direction and a second cylinder hole for guiding the second piston in the axial direction. A plurality of first connection holes provided in parallel to the first cylinder hole at a connection end of the first cylinder; A plurality of connecting pins inserted into a plurality of pin receiving holes formed by a plurality of second connecting holes provided at connecting ends of the second cylinder and communicating with the first connecting holes; A first tapered surface having an outer diameter that gradually decreases from one end of the connecting pin toward the axially central portion, and an outer diameter that gradually decreases from the other end of each connecting pin toward the axially central portion. 2 taper surfaces and the first cylinder A plurality of first screw members projecting into the pin receiving holes and screwed and having their front end surfaces pressed against the first tapered surface, and the second cylinder projecting into the pin receiving holes and screwed respectively. And a plurality of second screw members whose tip surfaces are pressed against the second tapered surface.

The coupled cylinder of the present invention is provided with a first cylinder provided with a first cylinder hole for guiding the first piston in the axial direction, and a second cylinder hole for guiding the second piston in the axial direction. A plurality of first connection holes provided in a connection end portion of the first cylinder in parallel with the first cylinder hole, and the second cylinder. A plurality of connecting pins inserted into a plurality of pin receiving holes formed by a plurality of second connecting holes provided at connecting ends of the two cylinders and communicating with the first connecting holes; A first tapered surface whose outer diameter gradually decreases from one end of the pin toward the axially central portion, and a second tapered surface whose outer diameter gradually decreases from the other end of each of the connecting pins toward the axially central portion. Taper surface and front of the first cylinder, respectively A plurality of first screw members protruding into the pin receiving holes and screwed together, and having a tip surface pressed against the first tapered surface, and the second cylinders protruding into the pin receiving holes and screwed together, A plurality of second screw members whose front end surfaces are pressed against the second tapered surface.

A plurality of pin receiving holes are formed in the connecting end portions of the first and second cylinders in parallel with the cylinder holes, and the connecting pins are inserted into the respective pin receiving holes. A first tapered surface and a second tapered surface are formed on each connecting pin. The front end surface of the first screw member screwed into the first cylinder is pressed against the first taper surface, and the front end surface of the second screw member screwed into the second cylinder is used as the second taper surface. When pressed, the two cylinders are fastened in a connected state. When the respective screw members are fastened to the respective cylinders, the pressing force against the tapered surfaces of the screw members is converted into the tightening force of the two cylinders. The two cylinders can be firmly connected by a short-sized screw member attached in the lateral direction of each cylinder. Thereby, a small connected cylinder can be efficiently manufactured without providing a bolt in the axial direction of each cylinder.

It is sectional drawing of the multi-position cylinder which is one Embodiment of a connection type | mold cylinder, and shows the part corresponded to the AA line in FIG. FIG. 3 is a sectional view taken along line BB in FIG. It is the C section expanded sectional view in FIG. It is sectional drawing which shows the part corresponded in FIG. 2 in the multi-position cylinder which is other embodiment. It is a longitudinal cross-sectional view of the dual stroke cylinder which is other embodiment of a connection type | mold cylinder. It is a longitudinal cross-sectional view of the conventional multi-position cylinder shown as a comparative example. It is a longitudinal cross-sectional view of the conventional dual stroke cylinder shown as a comparative example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show a multi-position cylinder 10a which is an example of a coupled cylinder. The multi-position cylinder 10 a has a first cylinder 11 and a second cylinder 21. One end portion, that is, the base end portion of the first cylinder 11 is a connecting end portion 11a, and the other end portion, that is, the distal end portion 11b is a protruding end portion. One end portion, that is, the base end portion of the second cylinder 21 is a connecting end portion 21a, and the other end portion, that is, the distal end portion 21b is a closed end portion. The 1st cylinder 11 and the 2nd cylinder 21 are connected by each

connection end

11a and 21a.

The first piston 12 is incorporated in the first cylinder 11. A first cylinder hole 13 is provided in the first cylinder 11, and the first piston 12 is guided by the first cylinder hole 13 to reciprocate in the axial direction. A seal member 14 is provided in the first piston 12, and the seal member 14 is in sliding contact with the first cylinder hole 13 to seal between the first piston 12 and the first cylinder hole 13. A first piston rod 15 is provided on the first piston 12. The first piston rod 15 penetrates through a through hole 17a of a rod cover 16a provided at the tip of the first cylinder 11 and protrudes to the outside. The rod cover 16a is fitted in the first cylinder hole 13, and is fixed to the first cylinder 11 by a snap ring 18a. A space between the first cylinder hole 13 and the rod cover 16a is sealed by a seal member 19a. A seal member 20a seals between the rod cover 16a and the first piston rod 15.

The second piston 22 is incorporated in the second cylinder 21. A second cylinder hole 23 is provided in the second cylinder 21, and the second piston 22 is guided by the second cylinder hole 23 to reciprocate in the axial direction. The seal member 24 is in sliding contact with the second cylinder hole 23, and the seal member 24 seals between the second piston 22 and the second cylinder hole 23. A second piston rod 25 is provided on the second piston 22. The second piston rod 25 is coaxial with the first piston rod 15 and is abutted against the first piston 12. The second cylinder hole 23 is closed by a head cover 26 b provided at the tip 21 b of the second cylinder 21. The outer peripheral portion of the head cover 26 b is fixed by caulking into an annular groove provided on the inner peripheral surface of the second cylinder hole 23.

A stopper 27 is provided at the connecting end 11 a of the first cylinder 11. The stopper 27 is fixed by caulking in an annular groove provided on the inner peripheral surface of the first cylinder hole 13. The first piston rod 15 is located at the forward limit position when the first piston 12 contacts the rod cover 16a. On the other hand, when the first piston 12 comes into contact with the stopper 27, the first piston rod 15 is positioned at the retreat limit position.

A rod cover 16 b is provided at the connecting end 21 a of the second cylinder 21. The rod cover 16 b is fitted in the second cylinder hole 23.

Seal members

19b and 20b are provided on the rod cover 16b. The second piston rod 25 is located at the forward limit position when the second piston 22 contacts the rod cover 16b. On the other hand, when the second piston 22 comes into contact with the head cover 26b, the second piston rod 25 is positioned at the retreat limit position. Thus, for the second piston rod 25, the tip end 21b side of the second cylinder 21 is set to the retreat limit position, and the movement toward the connecting end portion 21a is defined as forward movement.

The seal ring 28 is mounted between the stopper 27 and the rod cover 16b. Seal members are respectively attached to both end faces of the stopper 27.

The pressure chamber 31 a is partitioned or partitioned by the first piston 12 and the stopper 27. The pressure chamber 31b is partitioned by the first piston 12 and the rod cover 16a. The first cylinder 11 is provided with a supply / discharge port 32a that communicates with the pressure chamber 31a and a supply / discharge port 32b that communicates with the pressure chamber 31b. When the first piston rod 15 is moved to project, compressed air is supplied from the supply / discharge port 32a to the pressure chamber 31a. At this time, the compressed air in the pressure chamber 31b is discharged from the supply / discharge port 32b. On the other hand, when the first piston rod 15 is moved backward toward the stopper 27, compressed air is supplied from the supply / discharge port 32b to the pressure chamber 31b. At this time, the compressed air in the pressure chamber 31a is discharged from the supply / discharge port 32a.

The pressure chamber 33a is partitioned by the second piston 22 and the head cover 26b. The pressure chamber 33b is defined by the second piston 22 and the rod cover 16b. The second cylinder 21 is provided with a supply / discharge port 34a communicating with the pressure chamber 33a and a supply / discharge port 34b communicating with the pressure chamber 33b. When the second piston rod 25 is projected and moved toward the first piston rod 15, compressed air is supplied from the supply / discharge port 34a to the pressure chamber 33a. At this time, the compressed air in the pressure chamber 33b is discharged from the supply / discharge port 34b. On the other hand, when the second piston rod 25 is moved backward toward the head cover 26b, compressed air is supplied from the supply / discharge port 34b to the pressure chamber 33b. At this time, the compressed air in the pressure chamber 33a is discharged from the supply / discharge port 34a.

Each supply / discharge port is a screw hole, and a joint connected to a fluid supply member such as a pipe or a hose is screwed, that is, screwed to the supply / discharge port.

When the reciprocating stroke of the first piston 12 is longer than the reciprocating stroke of the second piston 22, the first piston rod 15 is set to the intermediate position by the forward limit position of the second piston rod 25. . Therefore, the first piston rod 15 can be positioned at the three positions of the projecting limit position, the retreat limit position, and the intermediate position of the first piston rod 15. Both

pressure chambers

31a and 33a are supplied with compressed air having the same pressure. The thrust of the second piston 22 can be applied to the first piston 12. Accordingly, when the reciprocating stroke of the first piston 12 and the reciprocating stroke of the second piston 22 are set to be the same, the first piston rod 15 is driven from the retreat limit position to the protrusion limit position. Twice the thrust can be applied to the first piston rod 15.

As described above, the multi-position cylinder 10a includes the first cylinder 11 and the second cylinder 21 such that the second piston rod 25 is abutted against the first piston rod 15 via the first piston 12. Are connected cylinders connected to each other. The multi-position cylinder 10a has a usage pattern in which the first piston rod 15 is positioned at three positions and a usage pattern in which the first piston rod 15 is driven by double thrust. If another cylinder (not shown) is further connected to the tip 21b of the second cylinder 21, the stop position of the first piston rod 15 can be increased.

A plurality of first connection holes 36 a are provided in the connection end portion 11 a of the first cylinder 11. Each first connection hole 36 a is parallel to the first cylinder hole 13. Each first connection hole 36a opens adjacent to the first cylinder hole 13 on the connection end surface, that is, the abutting surface of the connection end portion 11a. A plurality of second connection holes 36 b are provided in the connection end 21 a of the second cylinder 21. Each second connection hole 36 b is parallel to the second cylinder hole 23. Each of the second connection holes 36 b is opened adjacent to the second cylinder hole 23 on the connection end surface of the connection end portion 21 a. As shown in FIG. 1, when the connection end surface of the first cylinder 11 and the connection end surface of the second cylinder 21 are abutted, a plurality of pin accommodation holes 37 communicate with the first connection hole 36a. It is formed by the second connecting hole 36b.

The connecting pin 40 is inserted into each pin accommodating hole 37. As shown in FIG. 3, the first flange portion 41 is provided at one end portion of the connection pin 40, and the first flange portion 41 is fitted into the first connection hole 36 a. Further, the second flange portion 42 is provided at the other end portion of the connecting pin 40, and the second flange portion 42 is fitted into the second connecting hole 36b.

A first tapered surface 45 is provided on the connecting pin 40. As shown in FIG. 3, the first tapered surface 45 is provided between the first flange portion 41 on the one end portion side of the connecting pin 40 and the central portion in the axial direction. As shown in the drawing, the first tapered surface 45 is inclined so that the outer diameter gradually becomes smaller from the one end portion side of the connecting pin 40 toward the axial center portion.

A second tapered surface 46 is provided on the connecting pin 40. As shown in FIG. 3, the second tapered surface 46 is provided between the second flange portion 42 on the other end portion side of the connecting pin 40 and the central portion in the axial direction. As shown in the figure, the second tapered surface 46 is inclined so that the outer diameter gradually becomes smaller from the other end side of the connecting pin 40 toward the axial center. As described above, the outer diameters of the first tapered surface 45 and the second tapered surface 46 gradually change in the axial direction.

A plurality of first screw members 47 are provided in the first cylinder 11. As shown in FIGS. 1 to 3, the first screw member 47 is screwed, that is, screwed into a screw hole provided in the first cylinder 11, and protrudes into the pin accommodating hole 37. The front end surface of the first screw member 47 is flat, and the front end surface is pressed against the first tapered surface 45. Further, the outer peripheral surface of the distal end portion of the first screw member 47 is in contact with the radially inner surface of the first flange portion 41.

A plurality of second screw members 48 are provided in the second cylinder 21. The second screw member 48 is screwed into a screw hole provided in the second cylinder 21 and protrudes into the pin accommodation hole 37. The distal end surface of the second screw member 48 is also flat, and the distal end surface is pressed against the second tapered surface 46. Further, the outer peripheral surface of the distal end portion of the second screw member 48 is in contact with the radially inner surface of the second flange portion 42.

As shown in FIG. 2, the cross section of the first cylinder 11 is substantially rectangular. The screw holes into which the first screw member 47 is screwed open on two surfaces, an upper surface 38a and a lower surface 38b, which are parallel to each other in FIG. Further, the supply /

discharge ports

32 a and 32 b are opened to the upper surface 38 a, and the respective supply /

discharge ports

32 a and 32 b are shifted in the width direction with respect to the first screw member 47. Similarly to the first cylinder 11, the second cylinder 21 has screw holes into which the second screw member 48 is screwed, and opens on two surfaces of the upper surface and the lower surface of the second cylinder 21. The supply /

discharge ports

34 a and 34 b are opened on the upper surface of the second cylinder 21. Sensor grooves 39 are provided on the left and right side surfaces 38 c and 38 d of the first cylinder 11 and the second cylinder 21. A sensor (not shown) for detecting the position of the piston is mounted in the sensor groove 39.

3, the first screw member 47 is fastened to the first cylinder 11, and the second screw member 48 is fastened to the second cylinder 21. At that time, a portion on the first flange portion 41 side of the tip surface of the first screw member 47 is pressed against the first tapered surface 45. Similarly, a portion of the tip surface of the second screw member 48 on the second flange portion 42 side is pressed against the second tapered surface 46. In this way, when the tip surface of the first screw member 47 is pressed against the first tapered surface 45, the first screw member 47 is tilted counterclockwise as indicated by an arrow in FIG. A reaction force is received from the first tapered surface 45 in the direction. Thereby, a pressing force in a direction toward the second cylinder 21 is applied to the outer side portion of the connection end portion 11 a of the first cylinder 11. Further, the distal end portion of the first screw member 47 applies a pressing force in a direction in which the first flange portion 41 is separated from the second flange portion 42.

Similarly, when the distal end surface of the second screw member 48 is pressed against the second taper surface 46, the second screw member 48 is inclined in the clockwise direction as indicated by an arrow in FIG. 2 receives a reaction force from the tapered surface 46. Thereby, a pressing force in a direction toward the first cylinder 11 is applied to the outer side portion of the connection end portion of the second cylinder 21. Further, the distal end portion of the second screw member 48 applies a pressing force in a direction in which the second flange portion 42 is separated from the first flange portion 41. When the tightening force of each

screw member

47, 48 is increased, the area of the portion where the tip surface is in contact with the tapered surfaces 45, 46 increases, and the respective pressing force is increased. The inclination angles of the respective

tapered surfaces

45 and 46 are set to about 3 to 5 °, but may be 10 ° or more.

A plurality of connecting pins 40 and

respective screw members

47 and 48 constitute a connecting unit. Thus, the two

tapered surfaces

45 and 46 provided on the connecting pin 40 constituting the connecting unit are inclined in opposite directions. When the

respective screw members

47, 48 are fastened to the

cylinders

11, 21, the pressing force of the

screw members

47, 48 against the tapered surfaces 45, 46 is converted into the tightening force of the two

cylinders

11, 21. Thereby, the two

cylinders

11 and 21 can be firmly connected by the

screw members

47 and 48 having short dimensions attached in the lateral direction of the

respective cylinders

11 and 21. Note that the pressing force can be applied to the two

cylinders

11, 48, even if the tip surfaces are pressed against the tapered surfaces 45, 46 without bringing the outer peripheral surfaces of the tips of the

screw members

47, 48 into contact with the

flanges

41, 42. 21 can be converted into a tightening force.

FIG. 4 is a cross-sectional view of a multi-position cylinder according to another embodiment, and shows the same portion of the first cylinder 11 as FIG. 4, members that are the same as those shown in FIG. 2 are given the same reference numerals.

In the first cylinder 11 shown in FIGS. 1 and 2, two first screw members 47 are provided opposite to each other, whereas in the first cylinder 11 shown in FIG. 4, Four first screw members 47 are provided. The two first screw members 47 are provided on the upper surface 38 a side of the first cylinder 11, and the other two first screw members 47 are provided on the lower surface 38 b side of the first cylinder 11. Yes. The first screw member 47 on the upper surface side and the first screw member 47 on the lower surface side face each other. FIG. 4 shows the first screw member 47 provided in the first cylinder 11, and the same number of second screw members 48 are provided in the second cylinder 21. As shown in FIG. 4, the form in which four screw members are provided in the cylinder can increase the fastening strength as compared with the case where two screw members are provided as shown in FIG. 2.

FIG. 5 shows a dual stroke cylinder 10b which is another embodiment of the coupled cylinder. In FIG. 5, members that are the same as those shown in FIG. 1 are given the same reference numerals.

As shown in FIG. 5, the first cylinder 11 and the second cylinder 21 are connected back to back. As with the multi-position cylinder 10a, the first cylinder 11 has a connecting end 11a at one end and a protruding end at the other end, that is, the tip 11b. On the other hand, as for the 2nd cylinder 21, the one end part is the connection end part 21a, and the other end part, ie, the front-end | tip part 21b, is a protrusion end part. Thus, in the multi-position cylinder 10a, the

front end portions

11b and 21b of both

cylinders

11 and 21 are both projecting end portions.

The rod cover 16a provided at the tip 11b of the first cylinder 11 is a first rod cover. A rod cover 16 b is provided at the tip 21 b of the second cylinder 21. The second piston rod 25 provided in the second piston 22 penetrates the through hole 17b provided in the rod cover 16b and protrudes to the outside. The rod cover 16b is fixed to the second cylinder 21 by a snap ring 18b. The space between the second cylinder hole 23 and the rod cover 16b is sealed by a seal member 19b, and the space between the rod cover 16a and the second piston rod 25 is sealed by a seal member 20b. In this way, the first piston rod 15 passes through the first rod cover 16a of the first cylinder 11, and the second piston rod 25 passes through the second rod cover 16b of the second cylinder 21. Yes.

The first head cover 26a is attached to the connecting end portion 11a of the first cylinder 11, and the first cylinder hole 13 is closed by the head cover 26a. A second head cover 26b is attached to the connecting end portion 21a of the second cylinder 21, and the second cylinder hole 23 is closed by the head cover 26b. In this dual stroke cylinder 10b, when the first piston 12 comes into contact with the head cover 26a, the first piston rod 15 is positioned in the retreat limit position, and when the first piston 12 comes into contact with the rod cover 16a, One piston rod 15 is located at the forward limit position. When the second piston 22 abuts on the head cover 26b, the second piston rod 25 is positioned at the retreat limit position, and when the second piston 22 abuts on the rod cover 16b, the second piston rod 25 is Located in the forward limit position.

As in the case shown in FIGS. 1 to 3, the connecting unit for connecting the two

cylinders

11 and 21 includes a plurality of connecting pins 40, a plurality of first screw members 47, and a plurality of second second members. And a screw member 48.

The dual stroke cylinder 10b described above can drive the first piston rod 15 and the second piston rod 25 separately and independently. Further, by fixing one of the two piston rods, the other piston rod can be operated with a three-stage stroke.

FIG. 6 is a longitudinal sectional view of a conventional multi-position cylinder shown as a comparative example. FIG. 7 is a longitudinal sectional view of a conventional dual stroke cylinder shown as a comparative example. The conventional example shown in FIGS. 6 and 7 is described in Non-Patent Document 1 described above. In each figure, the same code | symbol is attached | subjected to the member which is common in the member mentioned above.

In the conventional multi-position cylinder 10c shown in FIG. 6, mounting

holes

51 and 52 are formed through the cylinder walls of the first cylinder 11 and the second cylinder 21 in the axial direction. In order to connect both

cylinders

11 and 21, a nut 53 is attached to one cylinder 11, and a bolt 54 that is screwed into the nut 53 is attached to the other cylinder 21. The mounting holes 51 and 52 are provided at the four corners of the

cylinders

11 and 21, and the

cylinders

11 and 21 are connected by four bolts 54. Similarly, in the conventional dual stroke cylinder 10d shown in FIG. 7, a nut 53 and a bolt 54 are used to connect both

cylinders

11 and 21.

Thus, when the

cylinders

11 and 21 are connected using the axial bolts 54, the long mounting

holes

51 and 52 must be processed into the

cylinders

11 and 21 in order to connect the

long cylinders

11 and 21. Don't be. For this reason, the small-diameter mounting holes 51 and 52 cannot be efficiently processed in the

cylinders

11 and 21 with a high yield, and it is difficult to efficiently manufacture a small coupled cylinder with a small piston diameter. . Also, since the length of the bolt is limited, a long cylinder cannot be fastened. On the other hand, by connecting two

cylinders

11 and 21 using a connecting unit constituted by a plurality of connecting pins 40 and

screw members

47 and 48, a small connecting cylinder having a small piston diameter can be efficiently used. Can be manufactured automatically.

As shown in FIG. 6, in the conventional multi-position cylinder 10 c, the rod cover 16 b is attached to the connecting end of the second cylinder 21, and the stopper 27 is attached to the connecting end of the first cylinder 11. . Further, a seal ring 28 is attached between the rod cover 16 b and the stopper 27.

As shown in FIG. 7, in the conventional dual stroke cylinder 10 d, a head cover 26 a for closing the cylinder hole 13 of the first cylinder 11 is attached to the connecting end of the first cylinder 11. A head cover 26 b for closing the cylinder hole 23 of the second cylinder 21 is attached to the connecting end portion 21 a of the second cylinder 21.

The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the invention.

The coupled cylinder of the present invention has two cylinders in which the piston rod is reciprocated by a fluid, and is applied to drive the driven member by the piston rod.

Claims

A first cylinder provided with a first cylinder hole for guiding the first piston in the axial direction, and a second cylinder provided with a second cylinder hole for guiding the second piston in the axial direction. A connecting unit for connecting in the axial direction,
A plurality of first connection holes provided in the connection end portion of the first cylinder in parallel to the first cylinder hole, and a first connection hole provided in the connection end portion of the second cylinder. A plurality of connecting pins inserted into a plurality of pin receiving holes formed by a plurality of second connecting holes communicating with
A first tapered surface having an outer diameter that gradually decreases from one end of each of the connecting pins toward the central portion in the axial direction;
A second tapered surface having an outer diameter that gradually decreases from the other end of each of the connecting pins toward the axially central portion;
A plurality of first screw members each projecting into the pin accommodating hole and screwed into the first cylinder, and having a tip surface pressed against the first tapered surface;
A plurality of second screw members each projecting into the pin accommodating hole and screwed into the second cylinder, and having a tip surface pressed against the second tapered surface;
A connecting unit having.
The connection unit according to claim 1,
A first flange portion that is in contact with an outer peripheral surface of the first screw member and fitted into the first connection hole is provided at one end of the connection pin;
The connection unit which provided the 2nd flange part which the outer peripheral surface of a said 2nd screw member contacts, and is fitted to the said 2nd connection hole in the other end part of the said connection pin.
A first cylinder provided with a first cylinder hole for guiding the first piston in the axial direction, and a second cylinder provided with a second cylinder hole for guiding the second piston in the axial direction. A connected cylinder comprising:
A plurality of first connection holes provided in the connection end portion of the first cylinder in parallel to the first cylinder hole, and a first connection hole provided in the connection end portion of the second cylinder. A plurality of connecting pins inserted into a plurality of pin receiving holes formed by a plurality of second connecting holes communicating with
A first tapered surface having an outer diameter that gradually decreases from one end of each of the connecting pins toward the central portion in the axial direction;
A second tapered surface having an outer diameter that gradually decreases from the other end of each of the connecting pins toward the axially central portion;
A plurality of first screw members each projecting into the pin accommodating hole and screwed into the first cylinder, and having a tip surface pressed against the first tapered surface;
A plurality of second screw members each projecting into the pin accommodating hole and screwed into the second cylinder, and having a tip surface pressed against the second tapered surface;
An articulated cylinder having
The connected cylinder according to claim 3,
A first flange portion that is in contact with an outer peripheral surface of the first screw member and fitted into the first connection hole is provided at one end of the connection pin;
A connection type cylinder in which an outer peripheral surface of the second screw member is in contact and a second flange portion fitted into the second connection hole is provided at the other end portion of the connection pin.
The connected cylinder according to claim 3 or 4,
A first rod cover through which a first piston rod provided in the first piston penetrates is provided at a tip portion of the first cylinder;
A head cover for closing the second cylinder hole is provided at a tip of the second cylinder;
A connected cylinder in which a second rod cover through which a second piston rod provided in the second piston passes is provided at a connecting end of the second cylinder.
The connected cylinder according to any one of claims 3 to 5,
A first rod cover through which a first piston rod provided in the first piston penetrates is provided at a tip portion of the first cylinder;
A connected cylinder, wherein a second rod cover through which a second piston rod provided in the second piston passes is provided at a tip portion of the second cylinder.