JPH09236102A - Mounting structure and assembling method for seal band, and linear working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the end part mounting structure of a seal band wherein the end part of a seal band is mounted axially internally of the face of a barrel without needing machining on the outer peripheral surface of a cylinder barrel in a slit type rodless cylinder structure. SOLUTION: A mounting plate 53 is applied from the outside of the end part of an outer seal band 51, a fixed screw 54 is joined in a screwed-in state with an end fit-in member 33 fitted in the end part of a cylinder barrel 31 through a slit 32. The end part of an outer seal band is nipped between the barrel 31 and a mounting plate 53. A set screw 55 is screwed in the mounting plate 53 and an inner seal band 50 is fixed between the tip thereof and a fit-in shaft part 33a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner structure for closing a slit extending in the longitudinal direction of a rodless cylinder, an outer seal band mounting structure, a seal band assembling method, and a seal band mounting structure. A linear actuator having.

[0002]

2. Description of the Related Art A cylinder barrel has a slit in the longitudinal direction from which a part of a piston, which is slidable in the longitudinal direction of the barrel, is projected to the outside, and a mount is connected to the protruding portion to form a slit. Has known a structure of a rodless cylinder (linear actuator) whose inner and outer sides are sealed with an inner seal band and an outer seal band, respectively (Japanese Patent Publication No. 7-30765 and Japanese Patent Laid-Open No. 62-17730).
4, Japanese Utility Model Laid-Open No. 2-50501, JP-A-63-1909.
09). In these devices, both ends of the inner and outer seal bands are connected to an end cap fixed to the longitudinal end of the cylinder barrel at a position axially outside of the barrel end surface.

On the other hand, although a similar rodless cylinder is disclosed in Japanese Unexamined Patent Publication No. 5-106612, a block is formed on the upper surface of the casing (cylinder barrel) at a position longitudinally inward with respect to the longitudinal end surface of the casing. The outer seal band is fixed between the block and the casing with the left and right screws. Further, in JP-A-56-124711, grooves are formed at both axial end portions of a barrel having a cylindrical outer shape, retainer rings are fitted in the grooves, and clamp plates are arranged axially inside the retainer rings. The end cap fitted to the end of the barrel and the clamp plate are tightened with bolts to be integrally fixed to the barrel, and the outer seal band end is fixed with the set screw screwed to the clamp plate, and the inner seal band end is It is fixed to the end cap at a position outside the barrel end surface in the axial direction. In addition, JP-A-61-590
In No. 08, both ends of the inner seal band are fixed to the fitting shaft portion of the end cap to the barrel by clamps.

[0004]

In the end cap, both ends of each seal band are attached at positions axially outside the barrel end face, so that the total length of the linear actuator is at least the entire barrel length. It is the thickness of the end cap plus the length required to attach the band, and the total length cannot be shortened any further. Also,
For example, a guide rail is fixed to the base, connection plates protruding laterally from the side surface of the base are fixed to both ends of the base, and a slit is formed between the connection plates in a horizontal direction (guide rail direction) to form a rodless cylinder unit. The rodless cylinder unit seals both ends of the cylinder barrel with the connection plate and another end fitting member. It was completely inconvenient when the direction of the screw for fixing the band was aligned with the direction along the length of the connecting plate and the structure for connecting at the position axially outside the longitudinal end face of the barrel could not be adopted. .

In addition, in the case of the above, it is necessary to make a screw hole on the upper surface of the barrel, which is a problem in processing. This is because, in a rodless cylinder of a type in which both ends of the barrel are closed by end fitting members, an axial screw hole is generally bored in the barrel end surface in order to fix the barrel and the end fitting member with bolts. However, in the above-mentioned thing, in addition to the screw hole, it is necessary to make a screw hole orthogonal to the longitudinal direction on the upper surface of the barrel as described above. This is because the setup needs to be changed to change the direction, and the cost increases.

Further, in the above-mentioned one, a groove is formed on the outer periphery of the barrel in order to provide a clamp plate at the end portion of the rodless cylinder, and such groove processing has a processing cost similar to the screw hole processing described above. I have a problem
The complicated structure for mounting the end cap, which uses the clamp plate, the retainer ring, and the bolt, also has the drawback of increasing the cost. Further, in, the both ends of the inner seal band are connected to the end caps at positions axially outside of the end surface of the barrel, and in that respect, they cannot be adopted in the linear actuator described above.

As for the inner seal band only, since the inner seal band is stopped on the inner side in the axial direction from the end face of the barrel in the end cap, it can be used in the linear actuator as described above, and the inner seal band mounting portion is the end part. Since it is not necessary to be located axially outside the end surface of the barrel of the cap, the overall length can be shortened even in a normal rodless cylinder. However, the end attachment of the outer seal band is not mentioned at all. In view of these prior arts, the problem of the present application is that it does not cause a rise in processing and manufacturing costs, and it can be adopted in a linear actuator in which it is difficult to attach a band at the outer position of the barrel end face, and a normal rodless It is an object of the present invention to provide an inner and outer seal band end mounting structure for a cylinder, the overall length of which can be shortened.

Next, in a state where one end of the inner seal band attached with such a structure is set to a predetermined longitudinal position with respect to one end fitting member, the other end of the inner seal band is naturally the cylinder barrel. Does not reach the other end surface of. Therefore, since the slit between the other end of the inner seal band and the other end of the barrel is not covered with the inner seal band, if the other end fitting member is pushed in from the barrel end as it is, the end fitting is performed. As shown in FIG. 10, the sealing member (O-ring) 101 provided at the tip of the coupling member 100 swells and enters the slit 103 of the barrel 102 to be deformed, and cannot enter the inside of the inner seal band 104. There is a problem that the part fitting member cannot be fitted into the cylinder hole 105 properly. Another object of the present application is to provide a method of assembling the inner seal band when the end of the inner seal band is mounted inside the barrel end, as in the band mounting structure described above.

Next, like the above-mentioned linear actuator, another end (for example, a guide rail or a base) connects both ends of the barrel between a pair of front and rear connecting plates whose axial length is defined. When the rodless cylinder unit in which the plate and another end fitting member are fitted and closed is interposed, the dimension between the connection plates varies to some extent due to a processing error. Therefore, it is preferable to make the installation length of the rodless cylinder unit slightly shorter than the length between the connecting plates in consideration of the processing error, because it is possible to absorb the processing error in the longitudinal dimension between the connecting plates. When the band mounting structure of the present application is adopted, in this rodless cylinder unit, if only the end fitting member is fitted, the internal pressure due to the pressure fluid is constantly applied to the end fitting member so that the axial outside If a piston is used to abut against the end fitting member at its stroke end, a large axial thrust is applied to the end fitting member each time the piston reaches the stroke end. Since they work, these thrusts put excessive tension on the band, shortening the life of the band, and in extreme cases, Les there is a problem that cause. Another object of the present application is to provide a linear actuator that employs the above-described band mounting structure and that has a structure that absorbs an error in the longitudinal dimension and that prevents the occurrence of such excessive tension. Especially.

[0010]

In order to solve the above-mentioned problems,
In the present application, at the slit end portion corresponding to the fitting shaft portion of the end fitting member that closes both ends of the cylinder barrel, the slit end portion is screwed onto the fitting shaft portion so as not to process the outer peripheral surface of the slit end portion. The end of the outer seal band is clamped and fixed between the mounting plate and the outer surface of the barrel by the attached fixing screw, and the end of the inner seal band is fitted to the end fitting member by the set screw screwed into the mounting plate. It stuck to the joint.
As the assembly method, the other end of the inner seal band, which has one end in a predetermined position, is covered from the inside of the cylinder hole so that the inner seal band extends axially inward from the other end and axially outward from the other end face of the barrel. The inner surface of the inner seal band was covered with a cover member, and the other end fitting member was fitted into the cylinder hole in that state to prevent deformation of the airtight ring at the tip of the other end fitting member. Further, in a linear actuator having a seal band mounting structure of the present application and a type of rodless cylinder unit in which the end fitting member is not fixed to the barrel is arranged between the front and rear connecting rails, one end of the connecting plate is A force transmission member that pushes the fitting member in the axial direction is provided.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention for solving the above problems is a rodless cylinder structure in which a slit is closed by an inner seal band and an outer seal band, and end fitting members are provided at both ends of a cylinder barrel. Fit the fixing screw that penetrates the slit with the mounting plate applied from the outside at the slit end that corresponds to the end of the outer seal band and the fitting shaft of the end fitting member. The outer seal band end is clamped between the barrel and the mounting plate, and the end of the inner seal band is fixed to the fitting shaft of the end fitting member by the set screw screwed into the mounting plate. It sticks. With this fixed structure that uses slits, the outer surface of the barrel is not processed, so
Does not lead to soaring processing costs.

Further, a screw insertion portion is provided at an end portion of the outer seal band described above, and a fixing screw is inserted through the screw insertion portion so that the end portion of the outer seal band is at least on both sides in the slit width direction with respect to the fixing screw. It is preferable to have a structure in which the set screw is inserted into the screw insertion portion while being positioned. According to this, even if the set screw side of the mounting plate floats up by the set screw that fixes the inner seal band screwed to the mounting plate, the end of the outer seal band reaches the lateral position of the fixing screw of the mounting plate. Therefore, it is firmly fixed between the mounting plate and the barrel by the tightening force of the fixing screw.

Further, as an assembling method in which both ends of the inner seal band do not reach the end surface of the barrel, the inner seal band corresponds to the fitting shaft portion of the end fitting member which closes one end of the cylinder barrel. With one end located at a predetermined longitudinal position, at the other end of the cylinder barrel, inside the longitudinal end of the cylinder hole from the end of the inner seal band located inside the other end of the cylinder barrel in the longitudinal direction and outside the other end of the barrel. We propose a method in which the inner surface of the inner seal band is covered with a cover band that extends over the first end, the other end fitting member is fitted into the cylinder hole, and then the cover band is pulled out in the axial direction. According to this, the seal member (O ring) provided at the tip of the other end fitting member is prevented from entering the slit and deforming.

In carrying out the above method, an insertion portion is formed in the end fitting member so that the inner seal band is movable in the longitudinal direction, and the insertion portion is made to correspond to the inner seal band, and the above method is applied. By doing so, the work of removing the cover band is easy.

Further, both ends of the cylinder barrel are fitted and closed by a pair of end fitting members different from the connection plates between a pair of front and rear connecting plates whose longitudinal intervals are defined by other members, and the cylinder unit is mounted. A straight line whose length is set shorter than the mounting length between the connection plates, and the rodless cylinder unit having the above-mentioned seal band mounting structure is arranged with the slit facing other members to integrally connect the cylinder barrel end face and the connection plate. In the actuator, one connecting plate is provided with a push screw that pushes the end face of the end fitting member from the outside in the axial direction to the inside in the axial direction. Thus, even when the piston collides with the end connecting member, the force can be received by the connecting plate.

The seal band mounting structure described above can be applied to a linear actuator of another type as described above, for example, a fitting shaft portion of an end cap that is fastened to the cylinder barrel of a single rodless cylinder.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1, 2 and 3, a base 1 is a bottom wall 1a.
And a side wall 1b which is erected upward from the side end thereof, and has an L-shaped cross section. A shallow groove 2 for mounting the guide rail is provided on the upper surface of the bottom wall 1a over the entire length. On the top surface of the bottom of the groove 2, T
A groove 3 is provided. A T-shaped groove 4 for mounting the stop member mounting holder 75 is provided on the entire length of the base 1 on the side of the groove 2 opposite to the side wall 1b in the width direction. Side wall 1b of base 1
Near the side surface 1c on the side where there is no protrusion is a protruding portion 5 protruding upward, and this protruding portion 5 is provided with a through hole 6 which serves as a fluid passage over the entire length of the base 1. On the lower surface of the bottom wall 1a, T grooves 7 for attaching two linear actuators to the left and right,
7 is also provided over the entire length of the base 1. The base 1 is made of, for example, an extruded profile of aluminum alloy.

A guide rail 10 having a length slightly shorter than the entire length of the base 1 is arranged in the groove 2 of the base 1, and a mounting bolt 12 is inserted into a plurality of screw holes 11 provided in the guide rail 10 in the longitudinal direction. The guide rail 10 is integrally fixed to the base 1 by being screwed into the T-groove nut 13 fitted in the T-shaped groove 3. The guide rail 10 has a guide groove 14 (here, a semicircle: V
(There are also character shapes, etc.), and a large number of balls 17 are rotatably interposed between the guide groove 14 and the ball groove 16 of the guide element 15, and the guide element 15 rolls linearly in the longitudinal direction. You are being guided. Two such guides 15 are provided on the guide rail 10.
Is being guided. These two guides 15 are connected to the lower surface of a slide table (slide body) 18.
The number of guides 15 is not limited to the above.

Rectangular connecting plates 20 and 21 are fixed to the axially front and rear end faces of the base 1 by bolts 22, respectively. The connection plates 20 and 21 are the side walls 1 of the base 1.
It has a shape that extends further laterally than the side surface 1c on the side without b, and its height is the height of the barrel when the cylinder barrel 31 of the rodless cylinder unit 30 is laid sideways (in the width direction of the slit). The thickness is substantially the same as the barrel thickness H), and an accommodation space C for accommodating the rodless cylinder unit 30 is formed on the side of the side surface 1c of the base 1. A rodless cylinder unit 3 is provided along the guide rail 10 between the connection plates 20 and 21.
0 is allocated.

In the rodless cylinder unit 30, the cylinder barrel 31 has a substantially rectangular cross section and has a slit 32 over the entire length in the longitudinal direction. Both ends of the cylinder barrel 31 are closed by end fitting members 33. 6 shows the right one, the pair of end fitting members 33 includes a fitting shaft portion 33a that fits into the cylinder hole 34 of the barrel 31,
A thin collar portion 33b for axial positioning, and a fitting portion 33c of the connecting plates 20 and 21 facing outward in the axial direction,
Left and right cylinder chambers S1, S2 partitioned by the piston 40
It is provided with a communication passage 33d that opens to the. End fitting member 3
3, the fitting shaft portion 33a is only fitted into the cylinder hole 34 so as to close the cylinder hole 34 by the seal member (O ring) 25 attached to the tip, and is not fixed to the barrel 31. As shown in FIG. 4, the flange portion 33b and the fitting shaft portion 33a are cut out at a portion corresponding to the slit to form an insertion plane (insertion portion) 33e of the inner seal band. When assembling the seal band, the inner seal band can be easily moved in the longitudinal direction. The insertion plane 33e is provided on the fitting shaft portion 33a of the end fitting member 33.
2 for fixing the outer seal band in the axial direction at the center of the width direction
Two screw holes 35 are provided. Inside the longitudinal direction of the screw hole 35, washers 3 are provided on both outer sides of the inner seal band 50.
A groove 38 into which the head of the rivet 37 for fixing 6 is fitted is formed at the center of the insertion plane 33e in the width direction.
As shown in FIG. 5, the washer 36 is provided with the slit 32.
The inner seal band 50 functions to prevent the inner seal band 50 from being displaced in the width direction with respect to the slit 32.
Such a washer 36 is not necessary for other types of seal bands, such as elastic seal bands having a lip that elastically fits into the slit 32.

A piston 40 as an internal moving body is fitted in the cylinder hole 34 so as to be movable in the axial direction. Piston packings 41 are attached to both axial ends of the piston 40, and the piston 40 divides the cylinder hole 34 into left and right cylinder chambers S1 and S2. Piston 4
A yoke 42 in which part of 0 protrudes from the slit 32 to the outside
The yoke 42 has a hole 42a and a pin 42b.
The mount 43 is connected via the
Is configured. End plates 45 before and after the mount 43
The scraper 46 is attached to the end plate 45, and the scraper 46 is held by an O-ring 47 for attaching the scraper that surrounds the entire circumference of the external moving body 44. An inner seal band 50 that closes the slit 32 from the inner side and an outer seal band 51 that closes the slit 32 from the outer side are guided by the upper and lower guide surfaces of the yoke 42 and penetrate the external moving body 44. The inner seal band 50 and the outer seal band 51 are thin flexible seal bands made of a magnetic metal material such as stainless chrome steel, and are attracted by a magnet strip 52 provided at the outer edge of the slit 32. . The inner and outer seal bands 50 and 51 are made of other types of flexible seal bands such as urethane rubber, nylon, chrome steel and rubber, and the inner and outer seal bands are elastically disengaged from each other. Or,
Each may be elastically engaged with and disengaged from the slit 32 to close the slit 32.

As shown in FIGS. 5 and 6, both ends of the inner seal band 50 and the outer seal band 51 are connected to the pair of end fitting members 33. In FIG. 5A, at the end of the outer seal band 51, a mounting plate 53 is attached to the outer surface of the outer seal band 51 at the end of the slit 32, and two fixing screws 54 are attached from the outside of the mounting plate 53. Is screwed into the screw hole 35 of the fitting shaft portion 33a of the end fitting member 33 through the slit 32, and the set screw 5 is formed between the barrel 31 and the barrel 31 in the slit longitudinal direction.
It is clamped and fixed on the inner side of 5. The end portion of the inner seal band 50 is in a state where the rivet 37 of the inner seal band 50 is located in the groove 38 of the end fitting member 33, that is, the washer 36 is located at the end portion of the slit 32. A set screw 55 is screwed onto a mounting plate 53 fixed to the barrel 31, the set screw 55 is passed through the slit 32, and between the tip of the set screw 55 and the insertion plane 33e of the fitting shaft portion 33a. I am holding. The set screw 55 has a shape having a pointed portion 55a on the inner side of the front end, and when the force is fixed by pressing, the pointed portion 55a bites into the inner seal band 50, so that it can be fixed very strongly. Instead of the mounting structure shown in FIG. 5A, the structure shown in FIG. In FIG. 5B, a screw insertion portion 51a is formed at the end portion of the outer seal band 51 and is cut out in a U shape so that the screw portions of the fixing screw 54 and the set screw 55 can be inserted. The outer seal band 51 is held and fixed by threading a single fixing screw 54 from the outside of the mounting plate 53 through the screw insertion portion 51a and the slit 32 and screwing the same into the fitting shaft portion 33a. In addition, a set screw 55 for holding the inner seal band 50 between the insertion plane 33e.
Is also inserted into the screw insertion portion 51a. Screw insertion part 51a
Insert the fixing screw 54 and the set screw 55 into the
Since the ends of the outer seal band 51 are located on both sides of the slit 32 in the width direction, the mounting plate 53 may be lifted up in the vicinity of the set screw 55 by screwing the set screw 55 into the mounting plate 53. Also,
Can be securely held by one fixing screw 54,
As a result, since there is only one fixing screw 54, the fixing screw 5
The deformation of the barrel 31 due to the tightening of No. 4 can be prevented. The screw insertion portion 51a may be formed as an elongated hole, or holes for inserting the fixing screw 54 and the set screw 55 may be individually provided.

As shown in FIG. 6, the dimension between the outer end surfaces 33f of the flange portions 33b of the pair of end fitting members 33 of the rodless cylinder unit 30 (the rodless cylinder unit 3
The mounting dimension L1) of 0 is set to be slightly smaller than the internal dimension (mounting dimension L2) between the connection plates 20 and 21 for easy assembly. Then, the rodless cylinder unit 30 is laterally oriented so that the slit 32 faces the guide rail 10, and the fitting portions 33c of the fitting members 33 at both ends are fitted into the fitting holes 60 provided in the connection plates 20 and 21.
Are fitted to each other via a seal member (O ring) 61. On one of the connection plates (right side) 21, at a position facing the brim portion 33b of the end fitting member 33 facing each other,
A push screw 62 is provided, and the push screw 62 pushes the flange portion 33b of the one end fitting member 33 in the axial direction,
The flange 33b of the left end fitting member 33 is pressed against the left connection plate 20 together with the barrel 31, and in this state, the axial outer end surface 33f of the flange 33b pressed by the push screw 62 and the right side end 33f. A slight gap t is formed between the inner surface of the connection plate 21 and the inside. In this state, the left and right connecting plates 20 and 21 and the longitudinal end surface of the cylinder barrel 31 are fixed by the fixing screw 63. In the left connection plate 20, pressure fluid supply / discharge ports 23a and 23b are provided at a position facing the left end of the through hole 6 and a position facing the communication passage 33d of the left end fitting member 33, respectively. Is provided. The right connection plate 21 is provided with a supply / discharge passage 24 that communicates with the right end of the through hole 6 and also communicates with the communication passage 33d of the right end fitting member 33. One (left) connection Centralized piping can be made only from the plate 20. Of course, each of the left and right connecting plates 20 and 21 may be provided with a supply / discharge port corresponding to the left and right cylinder chambers S1 and S2.

The slide table 18 includes the side wall 1 in the width direction.
It is connected to the guide 15 at a position closer to b. The slide table 18 overhangs in the width direction from the connecting portion with the guide 15 to above the external moving body 44 of the rodless cylinder unit 30, and does not vertically overlap with the cylinder barrel 31. In the portion overlapping the external moving body 44, the leg 70 is provided at a position sandwiching the axial front and rear of the external moving body 44.
Is projecting toward the base. The external moving body 44 is sandwiched between a pair of front and rear legs 70, and a rubber damper (cushioning member) 71 is interposed between the end plate 45 of the external moving body 44 and the legs 70. The movement of 44 is transmitted to the slide table 18. A stopper 72 having a longitudinal length shorter than that of the slide table 18 is fixed to the lower surface of the slide table 18 between the guide 15 and the leg 70. Stopper 72
The axial end surfaces of the slide table 18 are contact surfaces 73, 73 with a shock absorber, which will be described later. As is clear from the drawing, the end surfaces 18a of the slide table 18 are more contact surface 73, 73.
Has entered inside in the longitudinal direction.

Next, at the inner position of the connection plates 20 and 21, as shown in FIG. 4, a groove 76 provided at the base of the stop member mounting holder 75 is fitted to the end of the guide rail 10. The tip portion 77 is projected toward the rodless cylinder unit 30, and by utilizing the T groove 4, the T groove nut 78 and the tightening bolt 7 that is screwed into the T groove nut 78.
9 is fixed so as to be movable in the axial direction. The left and right surfaces of the groove 76 are the left and right peripheral surfaces (vertical surfaces) of the guide rail 10.
0a, 10a (the width direction surface portion of the guide rail which is not related to the guide groove 14) are almost in contact with each other. As shown in FIG. 2, the T-groove nut 78 has a shape having an extending portion 78b on the inner side in the longitudinal direction with respect to the connecting portion 78a with the tightening bolt 79. The tip of the holder 75 for mounting the stop member is divided into two parts, and the screw portion 81 formed on the outer periphery of the shock absorber 80 is screwed into the holder 75 so that the shock absorber 80 itself can adjust the position of the holder 75 in the axial direction. The shock absorber 80 is fixed to the holder 75 with a fixing screw 82 at a predetermined axial position. The shock absorber 80 axially faces the stopper 72 of the slide table 18 and is located axially inward of the axially outer end surfaces of the connection plates 20 and 21. The shock absorber 80 may not be used depending on the usage of the linear actuator.
Reference numeral 85 is a mounting hole that vertically penetrates the connection plates 20 and 21, and reference numeral 86 is a mounting groove for an accessory member such as a switch provided in the side wall 1b.

As described above, the guide rail 10 has the base 1
Connection plates 20 and 21 extending laterally to the base are fixed to the end portion (here, the end surface) of the base 1, and the base bottom wall 1a and the rod are connected to the side of the base 1 between the connection plates 20 and 21. Since the slits 32 are arranged laterally toward the guide rails 10 by stacking them in the height direction with the pressureless cylinder unit 30, since the guide rails 10 are integrated with the base 1, the rigidity is maintained high, so that the connecting plate 20, Even when it is attached to a mechanical device by using the attachment holes 85 of 21, the guide of the slide table 18 is smoothly maintained and its usage is diversified as compared with the case where there is no base at all. 32 is sideways,
Since the external moving body 44 arranged outside the slit 32 is laterally oriented, it becomes a linear actuator having a small thickness, and it can be applied to a place where the vertical gap is narrow.

When the pressurized fluid (compressed air) is supplied or discharged from the supply / discharge ports 23a, 23b, the piston 40 moves from one stroke end to the other stroke end, whereby the external moving body 44 moves. Is moved so that the slide table 18 moves straight in a state of being guided by the guide rail 10. Slide table 18
Comes to the stroke end, the abutting surface 73 of the stopper 72 abuts the shock absorber 80, and the slide table 1
8. The stop shock is softened and stopped. Figure 1
In the shock absorber 80 on the right side of FIG. 1, an axial force acts on the base portion of the holder 75 at the time of collision, and a clockwise moment is applied to the base portion of the holder 75 in the horizontal direction by the axial force. Since the groove 76 is fitted in the left and right surfaces 10a, 10a of the long guide rail 10 which is firmly fixed to the base 1, its moment is substantially passed through the left and right surfaces 10a, 10b of the guide rail 10. The stop member mounting holder 75, which can be received by the entire base 1 and is easily loosened only by tightening only the tightening screw 79, can be held at a predetermined position without loosening for a long period of time, and the left and right vertical sides of the guide rail 10 that receive a moment can be held. The surfaces 10a, 10a are
Since the surface is unrelated to the guide groove 14, the guide of the guide 15 is not adversely affected even with such a configuration.
Similarly, due to the axial force, a moment in the direction in which the holder 75 is lifted from the base 1 is also generated in the stop member mounting holder 75, but since the T-groove nut 78 has the extending portion 78b, the moment is extended. It is reliably received by the installation portion 78b, and the tightening screw 79 is prevented from loosening due to the moment in that direction.

At the stroke end, the projection of the shock absorber 80 goes under the slide table 18 and abuts against the abutting surface 73, so that the abutting surface is conventionally located on the end surface of the slide table 18. If the strokes are the same, this configuration shortens the total length of the linear actuator due to the length overlapped with the slide table 18 at the time of collision, and makes the entire linear actuator compact, and the total length of the linear actuator is the same. Then, according to this configuration, the stroke can be lengthened.

Considering the case where the shock absorber 80 is removed from the above structure for convenience of use, the rodless cylinder unit 30 has a stroke end between stroke ends in which its piston 40 abuts on both end fitting members 33. It will move back and forth. Then, at the stroke end, the piston thrust force always acts on the end fitting member 33, and the end fitting member 33 receives a force outward in the axial direction. End fitting member 3
3 is only fitted into the cylinder hole 34,
In particular, on the side where the push screw 62 is provided, although there is friction holding by the fixing screw 54 that holds the outer seal band 51, there is no holding force enough to overcome the thrust, and the seal bands 50 and 51 are pulled. Attempting to move outwardly in the axial direction by the distance t, but the thrust force is
Since it is received by the connection plate 21 via the push screw 62, it is possible to prevent excessive tension from being generated in the seal bands 50 and 51 as a result, and to prevent deformation and damage of the seal bands 50 and 51. obtain. Further, even if the shock absorber 80 is not removed, by supplying the pressurized fluid, the corresponding end fitting member 33 receives the thrust force in the axial direction by the fluid pressure.
Similarly to the case of removing the band, the thrust of the band can be received by the connecting plate 21 by the action of the push screw 62.
It is possible to prevent the generation of tension due to the thrust at 0,51.

Next, the case where the band mounting structure of the present application is applied to a normal rodless cylinder will be described. In FIG. 7, what is different from the above is a normal rodless cylinder, so there is no guide rail 10, guider 15, connection plates 20, 21, base 1, slide table 18, etc., and there is no rodless cylinder unit. The end fitting members are end caps 33A and 33B fastened to the cylinder barrel 31 with fixing screws 90. Even in such a normal rodless cylinder,
Since the inner and outer seal bands 50, 51 are attached to the end portions of the end caps 33A, 33B at their ends, the end caps 33A, 33B are attached.
Of the fixing screw 90 axially outward from the end surface of the barrel 31.
It suffices if there is a meat pressure portion necessary for fixing the end cap, and the longitudinal length of the end cap can be shortened, and as a result, the overall length of the rodless cylinder can be shortened.

Next, a method of assembling the band mounting structure of the present application will be described. Both the inner and outer seal bands 50 and 51 are made to penetrate the external moving body 44 in advance, and the piston 40 is inserted into the cylinder hole 34. Washers 36 for positioning in the width direction are fixed to the inner seal band 50 at both longitudinal ends by rivets 37. In this state, the inner seal band 50 inside the slit 32 is pulled out so as to straddle one end of the cylinder barrel 31. Next, the inner seal band 50 is made to correspond to the insertion plane 33e of the one end fitting member 33, and the one end fitting member 33 having the O-ring 25 fitted at its tip is fitted into the cylinder hole 34. At this time, since the slit 32 is closed by the inner seal band 50, the O-ring 25 can be smoothly pushed into the inner seal band 50 without entering the slit 32. (FIG. 8A). Then, the inner and outer seal bands 50 and 51 are pulled to the other end side of the barrel 31 (at this time, since the inner seal band 50 is in the cylinder hole 34, the washer 36 at one end is slit 32 with a hooking tool such as a needle. The inner seal band 50 is positioned in the groove 37 of the one fitting shaft portion 33a into which the rivet 37 is fitted. Further, the outer seal band 51 is pulled to the other end in the axial direction to a predetermined position where the end portion thereof is slightly outside the rivet 37 of the inner seal band 50 in the axial direction as shown in FIG. 6 (FIG. 8B).

Next, on the other end side, the other end of the inner seal band 50 located inside the other end face of the barrel 31 is covered from the inside of the cylinder hole 34 to the axially inner side of the other end of the inner seal band 50. And a dummy cover band 95 is arranged so as to straddle the other end of the barrel. And
In this state, from the outside in the axial direction on the other end side, the covering band 95
(In other words, the inner seal band 50) is made to correspond to the insertion plane 33e of the other end fitting member 33, and the O-ring 25
The other end fitting member 33 fitted to the tip is fitted into the cylinder hole 34. Then, the slit portion between the other end of the barrel 31 and the other end of the inner seal band 50 covers the cover band 9
Since it is closed by 5, the O-ring 25 does not deform so as to expand into the slit 32, and is smoothly fitted into the cylinder hole 34 inside the covering band 95 as in the case of the one side described above.
There is no damage to the O-ring 25 (Fig. 9 (a)). Next, the cover band 95 is pulled out to the outside in the axial direction (FIG. 9B).
After that, the left and right ends of the outer seal band 51 are fixed to the barrel 31 with the mounting plate 53 and the fixing screws 54, and the left and right ends of the inner seal band 50 are screwed into the mounting plate 53 by the set screw 55. It is fixed to the portion 33a. In addition, one end fitting member 33 is fitted into the cylinder hole 34, and one ends of the inner and outer seal bands 50 and 51 are fixed to the fitted fitting shaft portion 33a, and thereafter,
The other end fitting member 33 may be fitted and the other ends of the inner and outer seal bands 50, 51 may be fixed to the other fitting shaft portion 33a.

[0033]

As described above, according to the present invention, the end faces of the inner and outer seal bands are fitted to the mounting plate, and the end portions are fitted axially inward from the end face of the cylinder barrel by the fixing screw and the set screw penetrating the slit. Since the fitting shaft of the mating member is used for mounting, it is not necessary to machine the outer peripheral surface of the barrel with screw holes when mounting the outer seal band, and there is no increase in the number of processes with different machining directions in barrel machining. Therefore, it can be implemented at low cost. Also, since the end faces of the inner and outer seal bands are inside the end face of the cylinder barrel, it should be used in a linear actuator with a structure in which the direction of the screw that holds the seal band is along the length of the connection plate. In addition, in a normal rodless cylinder, the axial thickness of the end cap can be reduced, and the overall length can be shortened. When mounting the inner and outer seal bands, form a screw insertion part in the outer seal band, insert a fixing screw and a set screw into the screw insertion part, and position the outer seal band at least on both sides in the slit width direction with respect to the fixing screw. With such a structure, even if the set screw side of the mounting plate is lifted up by screwing the set screw into the mounting plate,
The end of the outer seal band can be securely held by the fixing screw.

The mounting length of the rodless cylinder unit adopting such a seal band mounting structure is
In a linear actuator in which the front-rear spacing is shorter than the mounting length of the regulated connection plate and arranged between the connection plates, the end fitting member of the rodless cylinder unit is only fitted to the end of the cylinder barrel. In this case, since one of the connecting plates is provided with a push screw that pushes the end fitting member in the axial direction, even if internal pressure or thrust by the piston is applied to the end fitting member, that thrust force is applied by the connection plate. It is possible to receive it, prevent excessive tension from being generated in the seal band, and absorb variations in dimensions between the connection plates.

Further, in the present application, when the other end of the inner seal band whose one end is located at a predetermined position with respect to the fitting shaft portion of the one end fitting member is assembled, the other end of the inner seal band is covered by the cover band. Since the assembly method that fits the end fitting member into the cylinder hole with the slit between the cylinder barrel and the other end surface of the cylinder barrel closed from the inside, it is attached to the tip of the other end fitting member. It is possible to prevent the seal member to be deformed by the slit, smoothly fit into the cylinder hole, and there is an advantage that the assembly is easy.

[Brief description of drawings]

FIG. 1 is a perspective view of a linear actuator having a band mounting structure of the present application.

FIG. 2 is a plan view of a linear actuator.

FIG. 3 is an enlarged cross-sectional view taken along the line III-III of FIG. 2;

FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG.

5A is a VV view (reduced view) of FIG. 4, and FIG.
Is another example of FIG.

FIG. 6 is a detailed view of a band attaching portion.

FIG. 7 is a view showing another linear actuator having the band mounting structure of the present application.

FIG. 8 is a diagram showing a band assembling method of the present application.

FIG. 9 is a diagram showing a band assembling method of the present application.

FIG. 10 is a diagram illustrating a conventional technique.

[Explanation of symbols]

 20, 21 Connection plate 30 Rodless cylinder unit 31 Cylinder barrel 32 Slit 33 End fitting member 33a Fitting shaft portion 33e Insertion portion 33A, 33B End cap 40 Piston 44 External moving body 50 Inner seal band 51 Outer seal band 51a Screw Insertion part 53 Mounting plate 54 Fixing screw 55 Set screw 62 Push screw 95 Cover band

Claims (6)

[Claims] 1. A rodless cylinder structure in which an external moving body is connected to a piston inside a cylinder barrel through a longitudinal slit provided in the cylinder barrel, and the slit is closed by an inner seal band and an outer seal band. The end fitting member is fitted to the end plate of the outer seal band at the slit end portion corresponding to the fitting shaft portion of the end fitting member, and the mounting plate is fixed by the fixing screw screwed to the fitting shaft portion. A seal band mounting structure characterized in that the end of the inner seal band is fixed to the fitting shaft of the end fitting member by means of a setscrew that is fitted between the barrel and the barrel and screwed into the mounting plate. 2. An outer seal band is provided with a screw insertion portion at an end thereof, and a fixing screw is inserted through the screw insertion portion to position the end portion of the outer seal band at least on both sides in the slit width direction with respect to the fixing screw. The mounting structure for a seal band according to claim 1, wherein a set screw is inserted into the screw insertion portion together with the screw. 3. An assembling method for attaching an end portion of an inner seal band to a fitting shaft portion of an end fitting member for closing both ends of a cylinder barrel having a slit in a longitudinal direction, wherein one end of the cylinder barrel is attached. With the corresponding one end of the inner seal band located at a predetermined position with respect to the fitting shaft of the closed end fitting member, the other end of the cylinder barrel is located inside the other end of the cylinder barrel in the longitudinal direction. After covering the inner surface of the inner seal band with a cover band that extends from the other end of the inner seal band to the longitudinal inside of the cylinder hole and the outside of the other end of the barrel, fit the other end fitting member into the cylinder hole, and then cover the band. The method of assembling the seal band is characterized in that the seal is pulled outward in the axial direction. 4. An assembling method for attaching an end portion of an inner seal band to a fitting shaft portion of a fitting member that closes both ends of a cylinder barrel having a slit in a longitudinal direction, the inner fitting member being an inner member. The seal band forms an insertion part that can move in the longitudinal direction, and the inner seal band is placed inside the slit and extends over the inner side and outside of the cylinder hole at one end of the cylinder barrel and is inserted into the inner seal band. The fitting shaft is fitted into the cylinder hole in a state where it corresponds to the section, and the inner seal band is moved in the direction toward the other end of the cylinder barrel by a predetermined amount to place one end of the inner seal band at the predetermined mounting position on the fitting shaft. Then, at the other end of the cylinder barrel, the inner seal bar is straddled over the inner side of the cylinder hole and the outer side of the cylinder hole from the other end of the inner seal band. Place a cover band so as to cover the inside of the band, fit the insertion part to the cover band, fit the other end of the fitting shaft into the cylinder hole, and then move the cover band axially outward. A method of assembling a seal band, which is characterized by removing it. 5. A rodless cylinder unit is arranged between a pair of front and rear connecting plates whose longitudinal intervals are defined by another member so that the slit faces the other member to integrally connect the cylinder barrel end face and the connecting plate. The rodless cylinder unit has both ends of the cylinder barrel fitted and closed with a connection plate and another end fitting member, and has the seal band mounting structure according to claim 1 or 2. The mounting length of the cylinder unit is set shorter than the mounting length between the connecting plates, and one connecting plate is provided with a push screw that pushes the end face of the end fitting member from the outside in the axial direction to the inside in the axial direction. A linear actuator characterized by that. 6. The end fitting member is an end cap that is fastened to the cylinder barrel.
A linear actuator having the seal band mounting structure according to claim 2.