JPH1172103A - Rodless cylinder having backlash preventing mechanism and chatter preventing spacer for rodless cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rodless cylinder having a backlash preventing mechanism, difficult to generate a backlash and excellent in cost performance, action performance and durability. SOLUTION: This rodless cylinder 1 having a backlash preventing mechanism is provided with a mover of structure connecting a piston part 14 and a slider part 21 able to integrally move. In the mover, in a region exposed outside a cylinder tube 2 through a slit 3 and a flat region in a peripheral surface of the cylinder tube 2, a clearance C1 is formed. In this clearance C1, a slide member is interposed so as to provide a play.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rodless cylinder having a rattling preventing mechanism and a rattling preventing spacer for the rodless cylinder.

[0002]

2. Description of the Related Art Many types of cylinders in which a piston is not provided with a rod, that is, rodless cylinders have been proposed. As can be seen from the structure of this type of cylinder, this type of cylinder has a characteristic that it is convenient for achieving a long stroke without taking up installation space.

FIG. 10 illustrates a conventional rodless cylinder 71. This rodless cylinder 7
A piston (not shown) is accommodated in the cylinder tube 72 that constitutes 1 so as to be movable along the tube longitudinal direction. A slit 73 is formed at the center of the upper surface of the cylinder tube 72. This slit 73 extends along the longitudinal direction of the tube, and
2 communicates inside and outside. Outside the upper surface of the cylinder tube 72, a table-shaped slider 74 for fixing a work is arranged. The piston and the slider 74 are connected so as to be integrally movable via a yoke 75 as connecting means. Therefore, when the pressurized air is supplied to and discharged from the pressure action chamber defined by the piston, the piston, the yoke 75 and the slider 74 move integrally along the longitudinal direction of the tube.

By the way, this kind of rodless cylinder 7
In No. 1, since there is a gap C1 between the lower surface of the slider connected portion 75a of the yoke 75 and the upper surface 72a of the cylinder tube 72, the slider 74 is likely to rattle (see the arrow A1 in FIG. 10). For this reason, a countermeasure to prevent rattling has been taken in the prior art in which a resin sliding member 77 is accommodated in a concave portion 76 provided in advance on the lower surface of the slider 74. A screw hole 78 communicating with the concave portion 76 is formed on the side surface of the slider 74, and an adjusting screw 79 is inserted into the screw hole 78. The tip of the adjusting screw 79
It is in contact with the resin sliding member 77 via the iron piece 80. Therefore, by appropriately tightening the adjusting screw 79, a part of the resin sliding member 77 is constantly pressed against the upper surface of the cylinder tube 72 with a considerable force. As a result, even if there is a gap C1 between the slider connected portion 75a and the cylinder tube 72, the slider 74 does not rattle at the stroke end.

[0005]

However, in the conventional rodless cylinder 71, since a part of the resin sliding material 77 is pressed against the edge on the upper surface of the cylinder tube 72, the sliding resistance is large. This is slider 7
4 deteriorated the operability. In addition, a part of the resin sliding member 77 is forcibly pressed against an uneven portion such as an edge portion by tightening the adjusting screw 79. Therefore, the sliding member 77 made of resin was apt to be abraded early. For this reason, an adjustment operation of excessively tightening the adjustment screw 79 by the amount of wear has to be performed frequently, and the operation is extremely complicated on the user side. Moreover, the sliding member 77 made of resin
Is constantly pressed against the edge portion, which further promotes the deterioration of the operability of the slider 74 and the early wear of the resin sliding member 77.

[0006] Further, in order to take such measures to prevent rattling, not only mechanical processing of the slider 74 is required, but also complication of the configuration and increase in the number of parts are unavoidable. Therefore, there is a problem that the rodless cylinder 71 becomes expensive. Further, it has been extremely difficult to perform additional processing and assembly of parts on the user side.

The present invention has been made in view of the above circumstances, and a first object of the present invention is to provide a rattling prevention mechanism which is less likely to rattle and which is excellent in cost performance, operability and durability. The object of the present invention is to provide a rodless cylinder having:

A second object of the present invention is to provide a rodless cylinder which is excellent as described above and is easy to assemble. A third object of the present invention is to provide an anti-rattle spacer for a rodless cylinder which is suitable for realizing the above excellent rodless cylinder.

[0009]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, a piston portion inside a cylinder tube and a slider portion outside the cylinder tube are connected so as to be integrally movable. In a rodless cylinder including a moving body having a structure, a gap formed between a part exposed outside the cylinder tube through a slit in the moving body and a flat part on the outer peripheral surface of the cylinder tube,
The gist of the present invention is a rodless cylinder having a rattling prevention mechanism characterized by interposing a sliding member.

According to the second aspect of the present invention, there is provided a rodless cylinder including a moving body having a structure in which a piston portion inside a cylinder tube and a slider portion outside the cylinder tube are integrally movably connected. The rattling prevention mechanism is characterized in that a sliding member is interposed so as to provide play in a gap formed between a portion exposed outside the cylinder tube through the slit and an outer peripheral surface of the cylinder tube. The gist is a rodless cylinder having the same.

According to the third aspect of the present invention, there is provided a rodless cylinder having a connecting means for integrally connecting a piston in a cylinder tube and a slider outside the cylinder tube so that the piston is outside the cylinder tube through a slit. A play is provided in the gap between the exposed slider connecting portion of the connecting means and the flat portion of the outer peripheral surface of the cylinder tube, and a sliding member is interposed so as to provide play. The gist is a rodless cylinder having a mechanism.

According to a fourth aspect of the present invention, in the third aspect, the sliding member has a locking portion which can be locked to an end face in the traveling direction of the slider connected portion, and a plate loosely inserted in the gap. And the like.

According to a fifth aspect of the present invention, in the third aspect, the sliding member is provided between a locking portion that can be locked to both end surfaces on the traveling direction side of the slider connected portion, and between the locking portion. And a plate-shaped portion that is located and is loosely inserted into the gap.

The invention according to claim 6 is the invention according to claims 3 to 5
In any one of the above, the side surface in the traveling direction of the locking portion is an inclined surface for discharging foreign matter to the outside in the width direction of the cylinder tube.

The invention according to claim 7 is the invention according to claims 3 to 6
In any one of the above-mentioned items, it is assumed that a scraper portion is formed in a part of the locking portion for removing foreign matter present by scraping the upper surface of the seal belt that protects the slit.

The invention described in claim 8 is the invention according to claims 1 to 7
In any one of the above, the sliding member is a rattling preventing spacer made of a wear-resistant resin. Claim 9
In the invention described in (1), a rattling preventing spacer used in a rodless cylinder including a moving body having a structure in which a piston portion inside a cylinder tube and a slider portion outside the cylinder tube are integrally movably connected, ,
A rattling preventing spacer for a rodless cylinder, comprising a plate-like portion inserted into a gap formed between a portion of the moving body that is exposed outside the cylinder tube and a flat portion of an outer peripheral surface of the cylinder tube. Is the gist.

The tenth aspect of the present invention is used in a rodless cylinder provided with a moving body having a structure in which a piston portion inside a cylinder tube and a slider portion outside the cylinder tube are integrally movably connected. An anti-sticking spacer for a rodless cylinder having a plate-like portion that is loosely inserted into a gap formed between a portion of the moving body that is exposed outside the cylinder tube and an outer peripheral surface of the cylinder tube. The anti-skid spacer is the gist.

According to an eleventh aspect of the present invention, in the ninth or tenth aspect, there is provided a locking portion which can be locked to the moving body. The twelfth aspect of the present invention relates to the ninth to the first aspects.
1, wherein the locking portion can be locked to a positioning recess provided in the moving body.

According to the thirteenth aspect of the present invention, the rattling preventing spacer is used in a rodless cylinder having a connecting means for connecting a piston inside the cylinder tube and a slider outside the cylinder tube so as to be integrally movable. A locking portion that can be locked to both end surfaces on the traveling direction of the slider connected portion of the connecting means exposed outside the cylinder tube; and the slider connected portion located between the locking portions. And a plate-shaped portion which is loosely inserted into a gap formed by a flat portion of the outer peripheral surface of the cylinder tube and a flat portion of the cylinder tube.

Hereinafter, the "action" of the present invention will be described. According to the first aspect of the present invention, since the sliding member is interposed in the gap between the exposed portion and the flat portion on the outer peripheral surface of the cylinder tube, the surface pressure applied to the sliding member during sliding is provided. And the sliding resistance is suppressed to a small value. Accordingly, the operability of the moving body is improved, and wear of the sliding member is less likely to occur at an early stage. Further, the sliding member acts as an obstacle to the slider portion which is about to sink, and receives the load. Therefore, rattling of the slider portion is prevented. Furthermore, this configuration not only eliminates the need for additional machining or the like, but also simplifies the configuration, so that the cost can be reduced.

According to the second aspect of the present invention, a play is provided between the exposed portion and the outer peripheral surface of the cylinder tube and the slide member, so that the slide member is provided with respect to the two members. Will not always be pressed. Therefore, as a result of suppressing the sliding resistance to a small value, the operability of the moving body is improved, and the sliding member is less likely to be worn out early. Further, when it is necessary to prevent the rattling, the sliding member becomes an obstacle of the slider portion which is going to sink and receives the load. Therefore, rattling of the slider portion is prevented. Furthermore, this configuration not only eliminates the need for additional machining or the like, but also simplifies the configuration, so that the cost can be reduced.

According to the third aspect of the present invention, since the play is provided between the slider connected portion and the outer peripheral surface of the cylinder tube and the sliding member, the sliding member is constantly pressed against the two members. It will not be in a state of being left. In addition, since the sliding member is interposed in the gap between the slider connected portion and the flat portion of the outer peripheral surface of the cylinder tube, the surface pressure applied to the sliding member during sliding is reduced.

By the synergistic action of the above two items, the sliding resistance is suppressed to a smaller value. As a result, the operability of the slider is further improved, and the sliding member is less likely to be worn earlier. Further, when it is necessary to prevent rattling, the sliding member acts as an obstacle for the slider to sink, and receives the load. Therefore, rattling of the slider is prevented. Furthermore, this configuration not only eliminates the need for additional machining or the like, but also simplifies the configuration, so that the cost can be reduced.

According to the fourth and fifth aspects of the present invention, when it is necessary to prevent rattling, the loosely inserted plate-like portion becomes an obstacle for the slider to sink and receives the load. In addition, since the locking portion is locked to the end surface in the traveling direction of the slider connected portion, the displacement is prevented, and the sliding member is prevented from falling off. In particular, if the locking portions are provided at both end surfaces in the traveling direction as in claim 5, the displacement is more reliably prevented. Further, with this configuration, it is only necessary to insert the plate portion into the gap after removing the slider from the connecting means, so that the assemblability is excellent.

According to the sixth aspect of the present invention, the foreign matter in front of the slider is bounced outward in the width direction of the cylinder tube by contacting the inclined surface. As a result, the foreign matter in the gap is discharged to the outside, and the probability that the foreign matter enters the cylinder tube through the slit is reduced. Therefore, the dustproofness and dripproofness of the cylinder are reliably improved.

According to the seventh aspect of the present invention, since the scraper portion scrapes and removes foreign matter on the upper surface of the seal belt, the probability of foreign matter entering the cylinder tube through the slit is reduced. Therefore, even if the scraper originally provided in the slider is omitted, a high dustproofing property
Drip-proof property can be secured.

According to the eighth aspect of the present invention, the use of a resin that is resistant to wear prolongs the life of the spacer itself and improves the durability of the entire device. Further, the resin is a relatively inexpensive material and has an advantage that it can be easily formed into a desired shape. This is convenient for cost reduction and easy manufacturing.

According to the ninth aspect of the present invention, the plate-like portion becomes an obstacle for the slider portion to sink, and the load of the slider portion is received. In addition, since the plate-shaped portion is inserted so as to be in sliding contact with a flat portion on the outer peripheral surface of the cylinder tube, it leads to a decrease in surface pressure received during sliding, and the sliding resistance is suppressed to a small value.

According to the tenth aspect of the present invention, when it is necessary to prevent rattling, the plate-shaped portion becomes an obstacle to the slider portion which is about to sink, and the load of the slider portion is received. Further, since the plate portion is loosely fitted, the plate portion is not always pressed against other members, and the sliding resistance is suppressed to a small value.

According to the invention described in claims 11 and 12,
The displacement is prevented by locking the locking portion to the moving body, and the sliding member is prevented from falling off. According to the invention as set forth in claim 13, if the plate-like portion of the spacer for preventing rattling is loosely inserted into the gap, the slider tends to sink when the rattling prevention is required. And receives the load of the slider. In addition, since the plate portion is inserted so as to be in sliding contact with a flat portion of the outer peripheral surface of the cylinder tube, it leads to a decrease in surface pressure received during sliding, and the sliding resistance is suppressed to a small value.

Further, since the locking portion is locked to the end face on the traveling direction side of the slider connected portion, the displacement is reliably prevented, and the sliding member is prevented from falling off. Further, with this configuration, it is only necessary to insert the plate portion into the gap after removing the slider from the connecting means. Therefore, the assemblability can be made extremely excellent.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] Hereinafter, a rodless cylinder according to an embodiment of the present invention will be described in detail with reference to FIGS.

As shown in FIG. 1 and the like, the cylinder tube 2 constituting the rodless cylinder 1 of the present embodiment
It is a long member having a substantially rectangular cross section and a cylindrical shape. In the present embodiment, the cylinder tube 2 is an extruded product such as aluminum. As shown in FIG. 4, a slit 3 is formed at the center of the upper surface 2a of the cylinder tube 2. The slit 3 extends along the longitudinal direction of the tube and communicates inside and outside the cylinder tube 2. End brackets 4 and 5 are fixed to both ends of the cylinder tube 2, respectively. In the cylinder tube 2, cylindrical collars 6, 7 are fixed corresponding to the end brackets 4, 5, respectively. A first supply / discharge port (not shown) is provided on the end bracket 4 located on the right side in FIG. The first supply / discharge port communicates with the right pressure action chamber 9 via the right collar 6. FIG.
A second supply / discharge port 10 is provided on the end bracket 5 located on the left side of the first bracket. Second supply / discharge port 10
Is connected to the left pressure action chamber 11 via the left collar 7.

As shown in FIGS. 1 and 4, the slit 3
A first seal belt 12 is stretched on the outside. However, for convenience of illustration, the seal belt 12 is omitted in FIG. Both ends of the seal belt 12 are fixed to the end brackets 4 and 5, respectively. First
The seal belt 12 prevents the dust or the like from entering the cylinder tube 2 through the slit 3 by the slit 3.
In the immediate vicinity of the vehicle. On the other hand, a second seal belt 13 is stretched inside the slit 3. The seal belt 13 serves to prevent the pressure fluid (pressurized air in the present embodiment) supplied from the supply / discharge port 10 to each of the pressure action chambers 9 and 11 from leaking outside through the slit 3. I have.

The rodless cylinder 1 has a moving body. The piston 14 as a piston part which is a part of the moving body of the present embodiment is located in the cylinder tube 2. A piston 14 is provided inside the cylinder tube 2.
There is a space for accommodating a part of the yoke 15 as a connecting means. The pistons 14 are provided as a left and right pair with the yoke 15 interposed therebetween. These pistons 14
Have protruding portions that can fit into the collars 6 and 7, respectively. The space inside the cylinder tube 2 is the piston 1
Due to the presence of the yoke 15 and the yoke 15, it is divided into two areas, a right pressure action chamber 9 and a left pressure action chamber 11. When the pressurized air is supplied into the pressure action chamber 9 via the first supply / discharge port, both the pistons 14 and the yoke 15 move inside the cylinder tube 2 to the left in FIG. Conversely, when pressurized air is supplied into the pressure action chamber 11 through the second supply / discharge port 10, both pistons 14 and the yoke 1
Reference numeral 5 moves inside the cylinder tube 2 to the right in FIG.

As shown in FIG. 4, the yoke 15, which is a part of the moving body, includes a body 18, a head 19, and a neck 20. The body 18 is a cylinder tube 2
It is arranged inside. The head 19 is exposed to the outside of the cylinder tube 2 via the slit 3. A slider 21 is connected to a head 19 as a slider connected portion. The neck 20 is just slit 3
And connects the head 19 and the torso 18.

A belt groove 22 is formed in the center of the upper surface of the head 19 so as to extend along the longitudinal direction of the tube. The first seal belt 12 is slidably provided in the belt groove 22. A plurality of bolt insertion holes 23 are formed on both left and right sides of the belt groove 22. As shown in FIG. 5, a gap having a predetermined width (about 0.6 mm to 1.0 mm in the present embodiment) C1 is provided between the lower surface of the head 19 and the flat portion of the upper surface 2a of the cylinder tube 2.
Exists. The flat portion in the cylinder tube 2 of the present embodiment specifically refers to a flat region existing between the edge portion E1 and the slit 3 on the upper surface 2a (see F1 in FIGS. 2 and 4).

As shown in FIGS. 1 and 4, a slider 21 as a slider part, which is a part of the moving body, is located outside the cylinder tube 2. A pair of end blocks 27 are fixed to both end surfaces of the slider main body 26 constituting the slider 21. The slider body 26 is a metal extruded product having a substantially U-shaped cross section. The upper surface of the slider 21 is formed flat for attaching a work. On the other hand, on the lower surface of the slider 21, a concave portion 24 large enough to accommodate the head 19 is formed.

As shown in FIGS. 1 and 2, the slider 2
A scraper 25 is provided at a lower portion of both end faces on the traveling direction side of the first. These scrapers 25 are fixed to bearings (not shown) via shafts. The scraper 25 is urged downward by a spring (not shown) on the upper side. These scrapers 25 play a role of scraping the upper surface of the first seal belt 12 to remove foreign substances (for example, dust and droplets) there. Bolt insertion holes 17 are provided at a plurality of positions in the slider body 26. These bolt insertion holes 17
Are located at positions corresponding to the bolt insertion holes 23 in the head 19 of the yoke 15. Therefore, the slider 21 can be attached to the head 18 by fastening the bolt 28 in a state of being inserted through both the bolt insertion holes 23 and 17. The slider body 26 also has a plurality of work mounting holes 29 formed therein.

Next, a structure for preventing rattling in the rodless cylinder 1 will be described. FIG.
FIGS. 3A and 3B show a rattling preventing spacer 31 as a sliding member. The spacer 31 is a resin molded product made of a wear-resistant resin.
And a plate-shaped portion 33. As the abrasion-resistant resin, specifically, "Duracon (trade name)" which is a copolymer polyacetal resin is used. Spacer 31
Is slightly longer than the length of the head 19 as shown in FIG. There are two locking portions 32, each of which is formed so as to be able to lock on both end surfaces on the traveling direction side of the head 19. That is, the both locking portions 32 play a role in preventing the spacer 31 from being displaced in the tube longitudinal direction (progression direction).

The plate-like portion 33 is located between the locking portions 32, and its front and back surfaces are entirely flat except for the positioning stopper portion 35. Since the plate-like portion 33 is loosely inserted into the gap C1, its thickness is set to be somewhat smaller than the width of the gap C1. The width of the gap C1 is 0.
In the present embodiment, which is about 6 mm to 1.0 mm, specifically, the thickness of the plate portion 33 is set to about 0.3 mm to 0.5 mm. If the thickness is too small, the mechanical strength of the spacer 31 becomes small, and the load of the slider 21 may not be sufficiently received. On the other hand, if it is too thick, the plate-like portion 33 cannot be inserted into the gap C1 with play provided. Therefore, in some cases, the sliding resistance may not be sufficiently reduced.

The side surface in the traveling direction of the locking portion 32 is cut off at an angle of about 45 °. The inclined surface 34 formed as described above functions as a surface for discharging foreign substances such as dust and liquid droplets to the outside in the width direction of the cylinder tube 2.

On the outer edge of the plate portion 33, a positioning stopper portion 35 is provided so as to project therefrom. The thickness of the stopper portion 35 is about twice the thickness of the plate portion 33, and is larger than the width of the gap C1. Therefore, the stopper 35
Are engaged with the outer surface of the head 19 without being loosely inserted into the gap C1 (see FIG. 5). Therefore, the stopper portion 3
5 serves to prevent the spacer 31 from being displaced in the tube width direction. The stopper portion 35 is also engaged with the inner wall surface of the concave portion 24 of the slider 21 to prevent itself from being displaced with respect to the slider 21.

The above-mentioned rattling preventing spacer 31 is mounted as follows. Two spacers 31 are prepared in advance, and each bolt 28 is loosened to remove the slider 21 from the head 19 of the yoke 15. Next, each of the spacers 31 is slid horizontally from the outside of the head 19 in the tube width direction toward the center of the tube, and the plate portion 33 is loosely inserted into the gap C1 (see FIG. 5). In this case, the operator can easily perform the above operation by gripping the pair of locking portions 32 with fingers. Thereafter, the slider 21 is attached to the head 19 again with the bolt 28.
As a result, as shown in FIGS. 4 and 6, the two spacers 31 are separated from each other by a gap C1 so as to provide play.
Will be interposed. The spacer 31 has a head 19
Are arranged symmetrically on both the left and right sides of the vehicle.

Next, the operation of the thus constructed rodless cylinder 1 will be described. When pressurized air is supplied from a pressure supply source (not shown) to the first supply / discharge port, the piston 14 is pressed in the leftward direction in FIG. 1 by the pressure of the pressurized air introduced into the first pressure action chamber 9. . As a result, the piston 14, the yoke 15, and the slider 21 linearly move integrally toward the left side in FIG. When pressurized air is supplied to the second supply / discharge port 10, the second pressure action chamber 11
The piston 14 is pressed in the right direction in FIG. As a result, piston 1
4, the yoke 15 and the slider 21 move linearly and integrally together toward the right side in FIG. In the normal state as described above (that is, in a state where it is not necessary to prevent rattling), the sliding resistance of the plate portion 33 with respect to the upper surface 2a of the cylinder tube 2 and the lower surface of the head 19 is small. In other words, even though these members may come into contact with each other, the members do not come into pressure contact with each other unless a large offset load is applied from the slider 21 side.

When it is necessary to prevent rattling such as when the slider 21 reaches the stroke end, the spacer 3
The one plate-shaped portion 33 becomes an obstacle of the slider 21 which is going to sink, and receives the load. Therefore, rattling of the slider 31 is prevented.

Now, the characteristic effects of the present embodiment will be enumerated below. (A) In this rodless cylinder 1, a spacer 31 as a sliding member is interposed so as to provide play in a gap C1 formed between the lower surface of the head 19 and the flat portion of the upper surface 2a of the cylinder tube 2. . Therefore, the spacer 31
Is not always pressed against the head 19 or the cylinder tube 2. In addition, since the lower surface side of the spacer 31 is in sliding contact with the flat portion of the outer peripheral surface of the cylinder tube 2, the spacer
The surface pressure experienced by 1 also decreases.

Therefore, by the synergistic action of the above two items, the sliding resistance can be suppressed to an extremely small value in a normal state where it is not necessary to prevent rattling. As a result, the operability of the slider 21 is reliably improved. Also, the spacer 31
The abrasion of the plate-shaped portion 33 is less likely to occur early, and the durability of the device is reliably improved as compared with the related art. Therefore, rattling can be prevented for a long period of time. When it is necessary to prevent rattling, the spacer 3
The one plate-shaped portion 33 becomes an obstacle of the slider 21 which is going to sink, and receives the load. Therefore, slider 2
1 can be prevented from rattling.

(B) With the configuration of the rodless cylinder 1, unlike the conventional product, it is not necessary to form a screw hole or the like in the slider 21 by additional machining. Further, since a resin sliding member, an adjusting screw, and the like are not required, an increase in the number of parts can be minimized, and the configuration itself can be simplified. Therefore, the cost of the device can be reduced.

(C) The spacer 31 of the rodless cylinder 1 has two locking portions 32. Therefore, by locking the locking portions 32 to both end surfaces on the traveling direction side of the head 19, the displacement of the spacer 31 is reliably prevented, and the spacer 31 can be prevented from falling off. Further, with the configuration of the spacer 31, it is only necessary to insert the plate portion 33 into the gap C1 after removing the slider 21 from the head portion 19. That is, since the installation of the spacer 31 does not involve a large-scale disassembly of the apparatus, the apparatus can be easily assembled even on the user side, and the maintenance property is excellent. Further, according to the present embodiment, a complicated operation such as adjustment of the adjustment screw is not required at all. This also contributes to the improvement of maintainability.

(D) In this rodless cylinder 1, the side surface in the traveling direction of the locking portion 32 is an inclined surface 34 for discharging foreign matter. Therefore, the foreign matter in front of the slider 21 is bounced outward in the width direction of the cylinder tube 2 by contacting the inclined surface 34. as a result,
The foreign matter that has been in the gap C1 is discharged to the outside, and the probability that the foreign matter enters the cylinder tube 2 through the slit 3 is reduced. Therefore, the dustproofness and dripproofness of the rodless cylinder 1 are reliably improved. In particular, in the present embodiment, since the scraper 25 is also provided, high dustproofness and dripproofness can be obtained by synergistic action with the inclined surface 34.
That is, the foreign matter that has not been removed by the scraper 25 is reliably removed by the action of the inclined surface 34 behind the scraper 25.

(E) The spacer 31 of the rodless cylinder 1 is formed using Duracon which is a resin material which is particularly resistant to wear. Therefore, the life of the spacer 31 itself is extended, and the durability of the entire device is improved. Of course, 1
The fact that the resin molded article uses only the kind of material also contributes to the improvement of durability.

The resin is a relatively inexpensive material,
Moreover, it has the advantage that it can be easily formed into a desired shape. This is convenient for cost reduction and easy manufacturing. In addition, if the spacer 31 is made of resin, the spacer 31 can be formed lightweight, so that even if it is installed, the operability of the slider 21 will not be adversely affected. Second Embodiment Next, a rodless cylinder 41 according to a second embodiment will be described with reference to FIGS. This rodless cylinder 41 also has a rattling preventing spacer 42 as a sliding member. However, the shape is slightly different from the shape of the spacer 31 of the first embodiment. The description of the configuration common to the first embodiment and the second embodiment is omitted here.

As shown in FIG. 7, this spacer 42
Also has a locking portion 43 and a plate-shaped portion 33. Locking part 43
Are formed so that they can be locked to both end faces on the traveling direction side of the head 19. The plate-shaped portion 33 located between the locking portions 43 is loosely inserted into the gap C1.

In the present embodiment, the shape of the locking portion 43 is particularly different. The locking portion 43 has a tapered shape, and its upper surface is a rounded inclined surface. One of the two locking portions 43 has a scraper portion 43a in a part thereof. The scraper portion 43a protrudes toward the center of the tube, and reaches the upper surface of the first seal belt 12. As a result, as shown in FIG. 8, the upper surface of the first seal belt 12 is scraped off by the lower edge of the tip end of the scraper portion 43a. It should be noted that the first embodiment is provided on the side surface of the locking portion 43 in the traveling direction.
No equivalent to the inclined surface 34 is formed. The mounting method of the rattling preventing spacer 42 is also the same as that of the first embodiment, and the description is omitted.

The characteristic effects of the present embodiment will be listed below. (A) The rodless cylinder 41 of the present embodiment also has the same operation and effects (a, b, and b) as the rodless cylinder 1 of the first embodiment.
Needless to say, (c, e).

(B) Particularly in this embodiment, since the scraper portion 43a scrapes and removes foreign matter on the upper surface of the seal belt 12, the probability of foreign matter entering the cylinder tube 2 through the slit 3 is small. Become. Therefore,
Even if the scraper 25 originally provided in the slider 21 is omitted, there is an advantage that the rodless cylinder 41 can ensure high dustproofness and dripproofness.

The present invention is not limited to the above-described embodiment, but can be modified to another form as follows, for example. The anti-rattle spacer 51 of another example shown in FIG. 7A is obtained by forming a layer made of a wear-resistant sliding material on a sliding surface of a plate-like base material having a certain degree of hardness. Has become. As a specific example, for example, there is a plate-like base material (a metal piece such as stainless steel) 52 as a plate-like portion, in which a resin tape 53 made of Teflon (made of tetrafluoroethylene) is adhered to one side surface. The thickness obtained by adding the metal piece 52 and the tape 53 needs to be set smaller than the width of the gap C1.

The metal piece 52 constituting the spacer 51
At two or more places (in this case, two places) on the upper surface (in other words, the upper surface of the plate-shaped portion) of the
a is protrudingly provided. These locking projections 52a protrude in a direction perpendicular to the thickness direction of the plate-shaped portion. That is,
Unlike the first embodiment in which a) a locking portion that can be locked to both end surfaces of the head 19 of the yoke 15 in the traveling direction and b) a plate-shaped portion that is loosely inserted into the gap C1, in this alternative example, Configuration is omitted.

On the other hand, the head 1 of the yoke 15 on the moving body side
9, a bolt insertion hole 23 as a positioning recess is provided at a plurality of positions (here, two positions) in advance.
The position of each locking projection 52a corresponds to the position of each bolt insertion hole 23. And these two locking projections 52a
Are locked in the bolt insertion holes 23, respectively. As a result, even if there is no structure corresponding to the locking portion 32 of the first embodiment, the spacer 51 is positioned in the positioned state.
Is loosely inserted into the gap C1. Accordingly, the displacement of the spacer 51 is prevented, and the spacer 51 is reliably prevented from falling off. The locking projection 52a as a locking portion and the bolt insertion hole 23 as a positioning concave portion may be provided only at one place. The shape of the locking projection 52a is also shown in FIG.
It is not limited to a columnar shape as in (a).

In the head 19, the bolt insertion holes 23
Of course, other concave portions can be used as positioning concave portions. A concave portion may be provided in a portion other than the head portion 19, for example, the neck portion 20 and the like, and the locking protrusion 52a may be locked there. Further, a portion other than the concave portion may be used as a positioning structure. For example, by using the neck portion 20 itself as a positioning structure and providing a locking portion on the spacer 51 side so that the neck portion 20 can be sandwiched from both sides, positioning by locking can be achieved.

The anti-rattle spacer 54 of another example shown in FIG. 7B also has a configuration in which a resin tape 53 made of Teflon is adhered to one side of a metal piece 52. Both ends of the metal piece 52 are bent at a right angle so as to face the same direction. Both of the two bent portions function as locking portions 55 for preventing the spacer 54 from being displaced in the tube longitudinal direction. Therefore, in these spacers 54, the engagement projections 52a are omitted, and the portion to be loosely inserted into the gap C1 is flat. Therefore, as compared with the alternative example of FIG. 7A in which the play insertion portion has irregularities, there is an advantage that the installation of the spacer 54 is simplified and the assemblability is improved. However, in the case of a material composed of a plurality of types of materials as in this alternative example, the production tends to be somewhat troublesome as compared with the first and second embodiments. Also, it is necessary to select a tape 53 that is difficult to peel.

The anti-rattle spacer 57 of another example shown in FIG. 7C is a metal piece 53 of another example of FIG. 7B.
A positioning projection 56 is provided on the inner edge of the projection. In such another example, the neck 20 of the yoke 15
The movement of the spacer 57 in the width direction is restricted by the engagement of the tip of the positioning protrusion 56 with the first protrusion. Therefore, it is not necessary to provide the positioning stopper 35 as in the first and second embodiments. As shown in FIG. 7D, another example of the backlash prevention spacer 61 is a resin molded product as in the first embodiment, and the positioning protrusion 5 is formed on the inner edge of the plate-shaped portion 33.
6 may be protruded. The positioning stopper 35 is also omitted from the spacer 61. It is possible to adopt a configuration in which the spacer 31 of the first embodiment is divided in half like a rattling prevention spacer 64 of another example shown in FIG. Therefore, the spacer 64 is provided on one side of the plate-shaped portion 33 with the locking portion 3.
2 is provided with only one. This has the advantage that it can be used regardless of the size of the head 19.

The division of the plate-like portion 33 may be performed at a position exactly in the middle of both the locking portions 32 as shown in FIG. 7E, or at a position close to one of the locking portions 32. You may. Also, in each of the different examples shown in FIGS. 7A to 7D, a configuration in which the plate-like portion is divided may be employed.

In addition to the polyacetal resin material such as Duracon exemplified in the embodiment, a fluorine resin material such as Teflon may be used as the spacer forming material.

The structure in which the locking portion 32 is omitted in the first embodiment or the structure in which the locking portion 43 is omitted in the second embodiment can be adopted. In the first and second embodiments, the flat portion of the head 19 and the upper surface 2a of the cylinder tube 2 (F1 shown in FIG.
The spacers 31 and 42 are interposed so as to provide play in the gap C1 formed by the region (1).

In addition, for example, a structure in which the spacers 31 and 42 are interposed in the gap C1 formed by the head 19 and the flat portion of the cylinder tube upper surface 2a without much play is allowed. In addition, a configuration in which the spacers 31 and 42 are interposed so as to provide play in a gap formed between the head portion 19 and a not-so-flat portion of the cylinder tube upper surface 2a is also acceptable.

Here, in addition to the technical ideas described in the claims, the technical ideas grasped by the above-described embodiments are listed below together with their effects. (1) The rodless cylinder according to any one of claims 1 to 8, wherein the sliding member is a Duracon resin molded product. With this configuration, the durability of the device can be more reliably improved.

(2) In any one of claims 1 to 8, and the technical idea 1, the sliding member is symmetrically present on both right and left sides of the slider connected portion. Rodless cylinder with a mechanism. With this configuration, the load of the slider is evenly received, so that rattling can be more reliably prevented.

(3) The rodless cylinder according to any one of claims 3 to 8, wherein a positioning stopper is protruded from an outer edge of the plate-shaped portion of the sliding member. With this configuration, the displacement of the spacer in the tube width direction is prevented, and the spacer can be reliably prevented from falling off.

(4) The sliding member according to any one of claims 1 to 3, wherein a layer made of a wear-resistant sliding material is formed on a sliding surface of a plate-like base material having a certain degree of hardness. A rodless cylinder having a rattling preventing mechanism, which is a rattling preventing spacer.

(5) The sliding member according to any one of claims 1 to 3, wherein the sliding member is a spacer for preventing rattling formed by attaching a Teflon resin tape to one side surface of a metal piece. A rodless cylinder with a rattling prevention feature.

The technical terms used in this specification are defined as follows. "Fluids: Refers to gases such as nitrogen, oxygen, carbon dioxide, argon, hydrogen, and air such as mixtures thereof, as well as liquids, critical fluids, and other substances having properties similar to these."

[0074]

As described in detail above, according to the first to eighth aspects of the present invention, a rattling preventing mechanism which is less likely to rattle and which is excellent in cost performance, operability and durability. Can be provided.

According to the fourth aspect of the present invention, it is possible to provide a rodless cylinder in which the sliding member does not easily fall off and has excellent assemblability. According to the fifth aspect of the present invention, it is possible to provide a rodless cylinder in which the sliding member is harder to fall off and which is extremely excellent in assemblability.

According to the sixth aspect of the present invention, dust-proof
The drip-proof property can be reliably improved. According to the seventh aspect of the present invention, high dustproofness and dripproofness can be ensured even if the scraper is omitted.

According to the eighth aspect of the present invention, it is possible to improve durability, reduce costs, and facilitate manufacturing.
According to the ninth to thirteenth aspects of the invention, it is possible to provide an anti-rattle spacer for a rodless cylinder which is suitable for realizing the above excellent rodless cylinder.

[Brief description of the drawings]

FIG. 1 is a partially broken front sectional view showing a rodless cylinder according to a first embodiment of the invention.

FIG. 2 is a partially exploded perspective view of the rodless cylinder.

FIG. 3 (a) is a perspective view of a rattling preventing spacer,
(B) is the sectional view on the AA line.

FIG. 4 is a sectional view of the rodless cylinder.

FIG. 5 is an enlarged sectional view of a main part of the rodless cylinder.

FIG. 6 is an enlarged schematic plan view of a main part for explaining a positional relationship between the two when a spacer is mounted on the yoke.

FIG. 7 is a partially exploded perspective view showing a rodless cylinder according to a second embodiment.

FIG. 8 is an enlarged perspective view of a main part for explaining a positional relationship between the two when a spacer is mounted on the yoke.

9 (a) to 9 (e) are perspective views showing another example of an anti-rattle spacer.

FIG. 10 is a partially cutaway sectional view of a conventional rodless cylinder.

[Explanation of symbols]

1, 41: rodless cylinder, 2: cylinder tube, 3: slit, 12: first seal belt, 14:
Piston, 15 ... Yoke as connecting means, 18 ... Head as slider connected part, 21 ... Slider, 31,4
2, 51, 54, 57, 61, 64 ... anti-rattle spacers as sliding members, 32, 43, 55 ... locking portions, 3
3: plate-like part, 34: inclined surface, 43a: scraper part, C
1 ... gap.

Claims (13)

[Claims] 1. A rodless cylinder having a moving body having a structure in which a piston portion inside a cylinder tube and a slider portion outside the cylinder tube are integrally movably connected to each other. A rodless cylinder having a rattling prevention mechanism, characterized in that a sliding member is interposed in a gap between a portion exposed to the outside and a flat portion on the outer peripheral surface of the cylinder tube. 2. A rodless cylinder provided with a moving body having a structure in which a piston portion inside a cylinder tube and a slider portion outside the cylinder tube are integrally movably connected to each other. A rodless cylinder having a rattling preventing mechanism, characterized in that a slide member is interposed so as to provide play in a gap between a portion exposed to the outside and an outer peripheral surface of the cylinder tube. 3. A rodless cylinder having a connecting means for integrally connecting a piston in a cylinder tube and a slider outside the cylinder tube, wherein the connecting means is exposed outside the cylinder tube through a slit. A rodless cylinder having a rattling prevention mechanism, characterized in that a slide member is interposed so as to provide play in a gap formed between the slider connected portion and the flat portion of the outer peripheral surface of the cylinder tube. 4. The sliding member according to claim 1, wherein the sliding member has a locking portion that can be locked to an end surface on the traveling direction side of the slider connected portion, and a plate-like portion that is loosely inserted into the gap. 4. A rodless cylinder having the rattling prevention mechanism according to 3. 5. The sliding member has a locking portion that can be locked to both end surfaces on the traveling direction side of the slider connected portion, and a plate-shaped portion located between the locking portions and loosely inserted into the gap. The rodless cylinder having a rattling prevention mechanism according to claim 3, characterized by having: 6. The device according to claim 3, wherein a side surface in a traveling direction of the locking portion is an inclined surface for discharging foreign matter outward in a width direction of the cylinder tube. A rodless cylinder having the rattling prevention mechanism described in (1). 7. A scraper for removing a foreign substance therefrom by scraping off an upper surface of a seal belt for protecting the slit is formed in a part of the locking part. Item 7. A rodless cylinder having the rattling prevention mechanism according to any one of Items 3 to 6. 8. A rodless having a rattling preventing mechanism according to claim 1, wherein said sliding member is a rattling preventing spacer made of a wear-resistant resin. Cylinder. 9. A rattling preventing spacer used in a rodless cylinder having a moving body having a structure in which a piston portion inside a cylinder tube and a slider portion outside the cylinder tube are integrally movably connected, A rattling preventing spacer for a rodless cylinder, comprising a plate-shaped portion inserted into a gap formed between a portion of the moving body that is exposed outside the cylinder tube and a flat portion of an outer peripheral surface of the cylinder tube. . 10. A rattling preventing spacer used in a rodless cylinder including a moving body having a structure in which a piston portion inside a cylinder tube and a slider portion outside the cylinder tube are integrally movably connected, An anti-rattle spacer for a rodless cylinder, comprising a plate-like portion which is loosely inserted into a gap between a portion of the movable body exposed outside the cylinder tube and an outer peripheral surface of the cylinder tube. 11. The rattling preventing spacer for a rodless cylinder according to claim 9, further comprising a locking portion which can be locked to the moving body. 12. The rodless cylinder rattle according to claim 9, wherein the locking portion can be locked in a positioning recess provided in the moving body. Anti-stick spacer. 13. A rattle preventing spacer for use in a rodless cylinder having a connecting means for connecting a piston inside a cylinder tube and a slider outside the cylinder tube so as to be integrally movable. A locking portion that can be locked to both ends of the slider connecting portion of the connecting means in the traveling direction exposed to the connecting means; and an outer peripheral surface of the same cylinder tube as the slider connecting portion and located between the locking portions. A rattle-preventing spacer for a rodless cylinder, comprising: a plate-shaped portion that is loosely inserted into a gap formed by the flat portion of the rodless cylinder.