JP3526415B2 - Rodless cylinder and piston end - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention transmits the movement of an inner moving body inside a tube to an outer moving body outside the tube through a slit provided in the tube in a longitudinal direction, and the slit is closed by an inner seal band. The present invention relates to a rodless cylinder in which the middle portion of the inner seal band passes from the band guide portion at one longitudinal end of the inner moving body through the band passage groove to the band guide portion at the other longitudinal end.

[0002]

2. Description of the Related Art Both longitudinal ends of an inner seal band for sealing a slit provided in a longitudinal direction of a tube are connected to end closing members (for example, end caps) for closing both ends of a cylinder tube, and the ends are constrained in the width direction. Further, the middle portion of the inner seal band passes from the band guide portion provided at one longitudinal end of the inner moving body inside the tube, passes through the band passage groove, and passes through the band guide portion at the other longitudinal end. For example, Japanese Utility Model Publication No. 7-29283 describes that the piston end is molded from plastic, and the inner seal band is guided between the left and right side surfaces of the band guide portion formed on the piston end. Is shown. The width of the band guide (the distance between the left and right sides) has a relatively large dimensional tolerance due to the fact that the band guide is molded from plastic, and the inner seal band must fit between the left and right sides. Therefore, conventionally, there is a gap between the left and right (width direction) both end portions (side end surfaces) of the inner seal band and the left and right side surfaces of the band guide portion.

This state will be described in detail. To describe with reference to FIG. 1 showing the present application, the band guide portion 90 is formed on the outer peripheral surface on the slit 3 side of a piston end 21 attached to both longitudinal ends of a piston portion 20a constituting the inner moving body 20. As shown in FIG. 19 , the conventional band guide portion 90 is formed of a guide plane 93Ia having a downward slope toward the band passage groove 20b and a side surface 92I extending vertically from the widthwise end of the guide plane 93Ia. The inner side surface 30c of the inner seal band 30 facing the cylinder hole 2a is slidably contacted with the guide plane 93Ia of the band guide portion 90,
The inner seal band 30 covers the slit 3 over the longitudinal direction of the cylinder tube 2 in a state where there is a gap between the side surface 92I of the band guide portion 90 and the width direction side end surface 30f of the inner seal band 30. Also, the inner seal band 30
The intermediate portion located between the band guide portions 90, 90 passes through the band guide groove (band passage groove) of the inner moving body as described above. A relatively large gap is formed between the left and right side walls in the width direction and the left and right ends of the inner seal band in the width direction (U.S. Pat. No. 62-81702, U.S. Pat. No. 38204).
46, JP-A-11-13711, etc.).

On the other hand, in US Pat. No. 3,893,378, the inner seal band is just fitted between the left and right side walls of the band guide groove of the inner moving body so that the left and right side ends of the inner seal band in the width direction are left and right of the band guide groove. Those in direct contact with the sidewall surface are disclosed.

[0005]

In the above description, the positions of both ends of the inner seal band in the longitudinal direction are restricted. However, in the longitudinal middle portion, both end portions in the width direction of the inner seal band and the inner movable body are in contact with each other. Since there is a relatively large gap between the side surface of the band guide portion and the left and right side surfaces of the band guide groove of the inner moving body, the inner seal band easily shifts in the width direction.

Such a tendency of the band to easily shift in the width direction becomes remarkable especially in a rodless cylinder having a long stroke or in a use condition in which the width direction of the inner seal band is vertical. By shifting the band from side to side in this way, the slit sealing action of the band is reduced, resulting in pressure fluid leakage from the inside of the cylinder tube.
A so-called stick-slip phenomenon occurs in which the movement of the inner moving body, that is, the outer moving body is not smooth. Further, when the band shifts to the left and right, the portion of the piston packing that comes into pressure contact with the inner seal band is widely worn in the width direction, which causes a problem of early deterioration of the sealing function of the piston packing.

Then, the inner seal band has its both ends,
Since the position in the left-right direction is constrained by the band guide groove portion of the inner moving body, even if the stroke is long, the distance between the constraining portions will be shorter than the above, so there will be no lateral shift of the band. Although it can be expected to make it smaller, since both sides of the inner seal band in the width direction are slidably guided by the side faces of the band guide groove of the inner moving body, the band width is also reduced. The groove widths must also be manufactured with high accuracy, and it is difficult to deal with variations in these dimensions. Further, since the wear resistance of the side surface of the band guide groove depends on the material of the inner moving body, it is difficult to adopt a wear resistant material only for that portion. Further, when the lateral displacement of the inner seal band is suppressed only by the side surface of the band guide groove, the side surface of the band guide groove is easily scratched by the end face in the width direction of the inner seal band, and in particular, the inner seal band is a metal strip. Occasionally, if the side surface of the band guide groove is aluminum or steel, wear powder will be generated by direct contact with the inner seal band, and the wear powder will adhere to the inner seal band, shortening the life of the inner seal band. It leads to deterioration of function.

A main object of the present invention is to provide an inner seal for a slit of a rodless cylinder, which is generated due to a gap between the widthwise ends of the inner seal band in the band guide portions at both longitudinal ends of the inner moving body. (EN) Provided is a rodless cylinder capable of suppressing the positional displacement of the band in the width direction, improving the durability of the inner seal band and the piston packing, and allowing the moving member to move smoothly. In addition, another problem of the present application is, as a structure that more effectively suppresses the positional deviation, when combined with a structure that regulates the left and right positions of the inner seal band in the band passage groove of the inner moving body,
(EN) Provided is a rodless cylinder which can easily cope with dimensional variations of a band passage groove and an inner seal band and can employ a material having excellent wear resistance as a sliding contact member at a side end of the inner seal band. . Still another object of the present invention is to provide the rodless cylinder in which abrasion powder is not generated between the side end portion and the inner moving body even when the metal inner seal band is used. It is in.

[0009]

In order to solve the above-mentioned main problems, in the present invention, the movement of the inner moving body inside the tube is transmitted to the outer moving body outside the tube through a slit provided in the tube in the longitudinal direction. The slit is a rodless that is blocked by an inner seal band that passes from the band guide portion provided at one longitudinal end of the inner moving body to the band guide groove at the other longitudinal end through the band passage groove of the inner moving body. In the cylinder, the band guide is located on the left of the band guide.
Between the right flanks, with a narrower width between those flanks, the inner seal bar
The width of the seal band on the inner surface facing the cylinder hole side
Proposed abutting contact surfaces that are curved or inclined on both sides
It is characterized in that a recess is provided therein to prevent the seal band from being displaced in the width direction (Claim 1).

Further, according to the present invention for solving the above-mentioned main problem, the movement of the inner moving body inside the tube is transmitted to the outer moving body outside the tube through a slit provided in the tube in the longitudinal direction, and the slit is formed inside. in the rodless cylinder from the band guide portion through the band passage grooves of the inner moving body is closed by the inner seal band passing through the band guide portion of the longitudinal other end provided at a longitudinal end of the movable body, Ba
The band guide between the left and right sides of the band guide.
The width is narrower than the space between the two sides, and cylinder holes are provided on both sides in the width direction.
The inner seal band has an inclined surface with a downward slope toward the center.
Both sides of the seal band on the inner side facing the cylinder hole side in the width direction
It is characterized in that a recess is provided to abut and guide the abutting surface which is an inclined surface at the portion to prevent displacement in the width direction of the seal band (claim 2).

Specifically, the upper edge of the recess is configured to contact and guide the contact surface of the inner seal band (claim 3).

The inclined surface of the recess is the contact surface of the inner seal band.
And a contact surface of the inner seal band is abutted and guided to the band guide surface (claim 4).

[0013]

[0014]

In the inner seal band, the left and right ends in the width direction of the outer surface on the side opposite to the inner surface facing the cylinder hole are edge portions, and both width direction side portions of the inner surface are inclined toward the edge portion. The inner surface of the recess is formed into an inclined surface having a larger inclination angle than the contact surface of the inner seal band whose width becomes narrower toward the center of the cylinder hole. The abutting surface is abutted and guided by the upper edge portion (claim 5) .

In order to solve another problem of the present application, in the present application, a sliding contact member at a band side end for slidingly guiding both widthwise end portions of the inner seal band is provided inside the side surface of the band passage groove of the inner moving body. It is characterized in that the lateral displacement of the inner seal band with respect to the slit is suppressed by the recess of the band guide portion and the sliding contact member provided in the band passage groove of the inner moving body (claim 6) . The sliding contact member is a thin plate sliding contact member attached to the left and right side surfaces of the band passage groove of the inner moving body (claim 7) .

Further, the piston end of the rodless cylinder of the present application is provided with piston packings provided at both longitudinal ends of the piston portion forming the inner moving body of the rodless cylinder according to any one of claims 2 to 7. The piston end is formed on the outer peripheral surface on the slit side.
Place the band guide between the left and right sides of the band guide.
The width is narrower than the width between these sides, and
Inner seal van with a downward slope toward the center of the hole
Inner side of the seal band facing the cylinder hole side
Seals by abutting and guiding the abutting surface that is an inclined surface on the side
Indentation is provided to prevent displacement in the band width direction
(Claim 8) .

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION In FIGS. 1 to 3 showing a rodless cylinder (linear actuator) 1, a tube (cylinder tube) 2 formed by extruding or drawing a non-magnetic material (for example, aluminum alloy) is used. In addition to having a non-circular (ellipsoidal) cylinder hole 2a, a slit 3 is formed over the entire length in the longitudinal direction thereof. In addition to the cylinder hole 2a and the slit 3, the cylinder tube 2 has a mounting groove 4 for mounting an end member (end cap) and a sensor mounting member in parallel to the cylinder hole 2a on the outer surfaces of the left and right side walls in the width direction, in addition to the cylinder hole 2a and the slit 3. The groove 5 is formed.

Both longitudinal ends of the cylinder tube 2 are closed by end caps 10 and 10 which project upward from the tube upper surface 2b, and a cylinder chamber 6 is formed between the end caps 10 and 10. In FIGS. 1 and 2, the end cap 10 and the cylinder tube 2 are joined by a tapping screw 14 in a state where the fitting shaft portion 12 of the end cap 10 is fitted into the end portion of the cylinder hole 2 a via the cylinder gasket 13. .

The moving member 18 is composed of an inner moving body and an outer moving body 2.
6 and a force transmission member 22 connecting the two. The cylinder chamber 6 is divided into front and rear cylinder chambers 6A and 6B by a piston 20 as an inner moving body having a piston end 21 having a piston packing 21a at the front and rear ends 20d of the piston portion 20a. Piston part 20a
A band passing groove 20b is formed in a predetermined width at the center of the lower surface in the width direction along the longitudinal direction.

As shown in FIG. 4, the piston end 21 is formed in an oval shape which is substantially the same as the cylinder chamber 6 which can slide in the cylinder chamber 6. A packing fitting groove 21b for fitting the piston packing 21a is formed on the side of the cylinder chambers 6A and 6B of the piston end 21. The piston end 21 is made of a synthetic resin such as plastic having abrasion resistance and good slipperiness, and as shown in FIGS. 4 and 5, a sandwiching piece having elasticity projecting to the side opposite to the packing fitting groove 21b. 21c are integrally formed on both sides in the width direction. As shown in FIG. 8, the nipping claw 21d at the tip of the nipping piece 21c is caught in the nipping recesses 20e provided on both sides in the width direction of the end 20d of the piston portion 20a, and is integrally attached to the piston portion 20a. To be done.

The piston end 21 has a band guide portion 90 formed on the outer peripheral surface on the slit 3 side. As shown in FIG. 6, the band guide portion 90 is an arc surface having a downward slope toward the center of the piston 20. The distance between the side surfaces 92 rising from the outer end in the width direction of the outer arc surface 91 of the band guide portion 90 is set to be slightly wider than the width of the inner seal band 30, as shown in FIGS. The band guide portion 90 is provided with a recess 93 with a width narrower than that between the left and right side surfaces 92. The recess 93 has a trapezoidal cross-sectional shape as shown in FIG. 7, and the inner surface thereof has inner side arc surfaces 93a and inner side arc surfaces 93a and 93a as shown in FIGS. An inclined surface 93b having a downward slope (narrowing width) toward the center of the cylinder hole 2a continuous to the inner end in the width direction of 91.
And the inclined surface 93b has an inner seal band 30
The inclination angle is set to be larger than that of the contact surface 30e as the lower portion excluding the width direction side end portion (side end surface) 30f described later. The distance between the upper edge portions 93c of the recesses 93 is narrower than the width of the inner seal band 30, and the lower portion of the inner seal band 30 fits into the recess portions 93c.
Guides the contact surface 30e of the inner seal band 30 to guide the inner seal band 30 in the width direction of the seal band to prevent the inner seal band 30 from moving in the width direction (lateral displacement).

The slit 3 is formed in the piston portion 20a.
A force transmission member (piston yoke) 22 penetrating through is formed integrally. The force transmission member 22 spreads left and right outside the tube 2 and serves as a piston mount 23 as a main body member of the outer moving body 26. The piston mount 23 has an annular shape in which front and rear walls 23a and 23b in the width direction are continuous with front and rear walls 23c and 23d. A seal band passage space 24 is formed between the front wall 23c, the upper side of the force transmission member 22, and the rear wall 23d, through which an outer seal band 31 described later passes.

The lower surface of the piston mount 23 is formed with a scraper fitting step portion 25 over the entire circumference (FIG. 9), and the left and right walls 23a and 23b of the piston mount 23 are formed with a recess 25a at a longitudinal intermediate position. Together with the projection 48 of the guide member 40 described later, the guide member 4
Positioning means for determining the length of 0 is configured. The upper surface 22a of the force transmission member 22 and the bottom surface 22 of the band passage groove 20b.
b has a bulged shape on the upper side and the lower side, and front and rear portions thereof are mounting portions 27 and 27 to which band guides 41a and 41b, which will be described later, of the inner and outer seal bands 30 and 31 are mounted in a sandwiched state. . The piston portion 20a, the force transmission member 22, and the piston mount 23 are wholly die-cast aluminum-molded into a single member.

As shown in FIGS. 10 to 12, the force transmission member 2
The guide members 40 attached to the front and rear of 2 are made of a resin material having elasticity and high slidability, and draw an arc so as to bulge upward toward the inside in the longitudinal direction so as to guide the outer seal band 31. A band guide 41a for the outer seal band 31 that fits the width of the outer seal band 31 and an arc that bulges downward toward the inner side to guide the inner seal band 30.
Band guide 4 for the inner seal band 30 that fits the width of the
1b and. Outer surface of the tube (top surface here) 2
A sliding member (sliding plate) 43 that slides on b extends to both sides in the width direction before the step 25, and the band guide 41a is raised from the upper surface thereof.
The band guide 41 is provided below the center of the sliding member 43 in the width direction.
A slit sliding contact portion 45 which is in sliding contact with the opposing wall of the slit 3 is integrally formed from a little forward of the rising portion of a to the longitudinal inner end of the sliding member 43, and the left and right side surfaces thereof are in sliding contact with the inner wall of the slit 3. It is the contact surface 46. From the slit sliding contact portion 45, the band guide 4 is directed downward.
1b is down. On the lower surface (sliding surface) of the sliding member 43, a plurality of oil grooves 44 in the width direction are arranged side by side in the longitudinal direction. Inside the slit sliding contact portion 45, the band guide 4
A fitting groove 47 fitted into the force transmission member 22 from the inner surface 42a of the rising and falling walls of the la 1a, 41b to the rear portion.
Is formed.

A protrusion 48 is provided above the inner end of the sliding member 43 in the longitudinal direction. The guide member 40 has the fitting groove 4
7 is fitted into the force transmission member 22, and the upper and lower band guides 41a and 41b are attached to the front and rear mounting portions 27, 27.
In the state where the inner surface 42a of the rising and falling wall is in contact with the front surface 27a of the mounting portion 27, the protruding portion 48 is just inserted while being elastically opened so as to sandwich the upper and lower sides of the mounting portion 27.
Is locked in the recess 25a of the piston mount 23,
A quick engaging means 49 is constructed which holds the longitudinal position and the vertical direction of the guide member 40 and can be attached and detached with one touch.

On the side faces 20c of the band passage groove 20b facing each other in the width direction, the inner band guide 41b in a mounted state.
The thin plate sliding contact member 100 is adhered to the left and right side end faces in the width direction by an adhesive or a double-sided tape or the like (FIGS. 1 and 3). The sliding contact member 100 has its upper end aligned with the circular arc shape of the bottom surface 22b of the band passage groove 20b, and has a length substantially corresponding to the piston yoke 22 and is provided at a lower position from one end to the other end of the piston yoke 22. is there. The length of the thin plate sliding contact member 100 is the same as that of the thin plate sliding contact member 1 provided in the band passing groove 20b of the inner moving body 20.
00 and the inner seal band 30 between the end restraint of the inner seal band 30 by a mounting pin 39 described later.
The length may be any length that can suppress the lateral displacement with respect to.
The thin plate sliding contact member 100 is made of a synthetic resin material having high wear resistance and good slidability. The inner dimension of the sliding contact member 100 is
The width of the inner seal band 30 substantially matches the left-right width of the inner seal band 30, and the width direction left and right ends 30f of the inner seal band 30 are slidably contacted with each other with a minimum clearance. With this configuration, when the width of the inner seal band 30 varies or the groove width dimension of the band passing groove 20b varies, the above-mentioned variation in size can be coped with by appropriately selecting the plate thickness of the thin plate sliding contact member 100.

As shown in FIGS. 3 and 8, the guide member 40
A shim (adjustment member) 55 for adjusting the sliding state of the sliding member 43 with respect to the tube upper surface 2b is provided between the upper surface of the sliding member 43 and the lower surface of the piston mount 23.
It is interposed across the two front and rear sliding members 43. The shim 55 has a notch 56 having a size corresponding to the recess 25 a of the piston mount 23, and is engaged with the protrusion 48 that fits into the recess 25 a when the guide member 40 is attached to the force transmission member 22. The inner end in the width direction is brought into contact with the side surface of the rising wall of the band guide 41a to perform the positioning in the width direction and the axial direction. The shims 55 having different thicknesses are prepared in advance, and the shim 55 having the best sliding state is selected at the time of assembly.

The band cover 60 has elasticity and
It is molded from a resin material with good slidability. As shown in FIGS. 1 and 8, the top and bottom portions of the top plate portion 61 that fits into the band passing space 24 are provided with arms 62 that hang downward.
The engaging and disengaging claw 63 is provided at the tip. The lower surface of the engagement / disengagement claw 63 is formed on the guide surface 64 of the outer seal band 31. The side wall 6 is provided on the left and right in the width direction of the top plate 61.
5 hangs down (FIGS. 2 and 3), and the inside dimension of the side wall portion 65 is
The width of the outer seal band 31 is set to be slightly larger than that of the outer seal band 31, and the width of the band guide 41a for the outer seal band 31 is set so as to fit between the side wall portions 65 and 65. A plurality of ribs 66 are provided in the width direction between the side wall portions 65, 65, and the lower surface of the rib 66 is a guide surface 67 that is recessed upward for guiding the outer surface of the outer seal band 31, and The inner surfaces of the side wall portions 65, 65 facing each other are formed on the guide surfaces 68 of the end faces in the width direction of the outer seal band 31, respectively.

The lower surfaces of the front and rear walls 23c, 23d of the piston mount 23 of the outer moving body 26 are formed with engaging portions 70 which engage and disengage with the engaging and disengaging claws 63. On the step portion 25 for attaching the scraper, a scraper 75 having a double lip from below is provided with the sliding member 43 of the pair of guide members 40 and the shim 5 in the front and rear direction.
The outer peripheral surface of the outer peripheral surface of the outer peripheral surface of the outer peripheral portion 5 is surrounded by the outer peripheral surface of the outer peripheral portion 5 and is fitted into the outer peripheral surface. A plurality of positioning protrusions 76 each having a wide shape are inwardly projected inward in the middle of the longitudinal sides of the scraper 75 on both sides in the width direction (FIG. 9), and the protrusions 76 are the sliding members 43 of the guide member 40. The engaging means 71 is formed so as to engage with the notches 77 having the corresponding shapes provided on both sides in the width direction, and to position the scraper 75 in the front-rear direction along with the notches 77 and prevent the scraper 75 from coming out outward in the width direction. (Fig. 1
1).

The outer seal band 31, which closes the slit 3 from the outside, passes over the force transmission member 22, and both ends thereof reach the end caps 10. Further, the inner seal band 30 that closes the slit 3 from the inside is the band guide portion 9 of the piston end 21 on one end side of the piston portion 20a.
0 through the band passage groove 20b below the force transmission member 22 and the band guide portion 90 of the piston end 21 at the other end, and both ends of the inner seal band 30 reach the end caps 10. ing. As shown in FIG. 7, in the inner seal band 30, the left and right ends in the width direction of the outer side surface (upper side surface) 30 a facing the slit 3 side of the cylinder 1 are edge portions 30.
b, and the inner side surface 30c opposite to the outer side surface 30a
Both side portions in the width direction of the are chamfered to an inclined surface which is inclined toward the edge portion 30b direction, and this inclined surface is a recess 93.
Is an abutting surface 30e as a lower portion that is abutted and guided by the upper edge portion 93c.

As described above, the inner and outer seal bands 30 and 31 are thin flexible bands having a substantially flat cross section as a whole, as long as they have the inclined surface 30e on the inner surface 30c, and are, for example, steel bands. Made of magnetic material such as.
As well known, the inner and outer seal bands 30 and 31 have a width larger than the width of the slit 3. Seal band 30,
The longitudinal ends of 31 are attached to the end cap 10 by fitting the attachment pins 39 into the pin holes 38, and the longitudinal ends are constrained in the width direction. The mounting pin 39 is covered with a cover member 79 that is detachably attached to the end cap 10 to prevent it from coming off.

Magnets 80 for attracting the inner and outer seal bands 30, 31 are arranged on both sides of the slit 3 along the longitudinal direction. Except for the portion passing through the piston 20, the inner seal band 30 is slit 3 by the magnetic attraction force of the magnet 80 and the fluid pressure applied to the cylinder chamber 6.
From the inside, and the outer seal band 31 closes the slit 3 from the outside by the magnetic attraction force. Fluid from the supply / discharge port 15 provided on the side surface of the end cap 10 passes through the supply / discharge hole 81 of the end cap 10 and the supply / discharge hole 83 provided at the center of the internal damper 82, and the corresponding cylinder chamber 6
It is supplied to and discharged from A and 6B, whereby the piston 20, that is, the outer moving body 26 moves in the longitudinal direction. The internal damper 82 is
This is for abutting the end of the piston 20 at the end of the piston stroke to absorb the shock. Also, 8
Reference numeral 4 is an external damper that comes into contact with the piston mount 23 and absorbs inertial energy thereof.

By supplying and discharging the fluid through the supply and discharge ports 15 of the front and rear end caps 10, 10, the piston mount 23 moves while the inner and outer seal bands 30, 31 close the slit 3. At this time, both ends of the inner seal band 30 are positionally constrained in the width direction by the end caps 10, and the longitudinal middle portion of the inner seal band 30 has upper and lower edge portions 93c of the recess 93 of the piston 20 on the contact surface 30e. And the position in the width direction is regulated, and the widthwise displacement (widthwise movement) of the inner seal band 30 with respect to the slit 3 is suppressed. Thereby, the inner seal band 30 is displaced in the width direction.
Wide wear in the width direction of the piston packing 21a due to (lateral displacement), external leakage of fluid from the inside is reduced, and movement of the moving member 18 becomes smooth. If the moving member 18 wiggles in the longitudinal direction, the end cap 10, Stick sticks moving between 10 are prevented.

By suppressing the widthwise displacement of the inner seal band 30, the durability of the inner seal band 30 is also improved. In addition, the inclined contact surface 3 of the inner seal band 30
When the upper edge 93c of the recess 93 comes into contact with 0e, a centripetal force is generated in the inner seal band 30 toward the center in the band width direction.
The lateral position of the inner seal band 30 is also regulated by the sliding contact of both side ends 30f in the width direction of 0, so that the above-described shift prevention effect is increased. Further, by suppressing the widthwise displacement due to the contact between the indentation 93 and the inner seal band 30, the thin plate sliding contact member 100 is prevented from being worn out due to the sliding contact of the side end portion 30f with the thin plate sliding contact member 100. The member 100 is less likely to be scratched.

On the other hand, in the moving member 18, the outer seal band 31 does not contact the outer side surface of the outer seal band 31 with the outer moving body 26 (the inner surface of each wall of the piston mount 23) by the band cover 60, and , The inner surface (lower surface) of the outer seal band 31, the outer surface 3 of the inner seal band 30
0a (the surface facing the outer seal band 31: the upper side surface) is
Upper and lower band guides 41a, 41 before and after the force transmission member 22
b does not directly contact the circular arc surface (upper surface) 22a or the bottom surface 22b of the band passage groove 20b, and further, the thin plate sliding contact member 100 of the present application allows the width direction end surface 30f of the inner seal band 30 to be formed in the band passage groove 20b. It does not directly contact the side surface 20c. Therefore, the piston portion 20a and the force transmission member 2
2. When the piston mount 23 is made of metal, generation of wear powder from those surfaces is eliminated, wear powder does not adhere to the inner and outer seal bands 30 and 31, and the sealing function is stable,
In addition, the life of the inner and outer seal bands 30 and 31 can be extended.

The inner seal band 30 is prevented from fraying with the thin plate sliding contact member 100 by suppressing the widthwise displacement due to the contact between the indentation 93 and the inner seal band 30, but as a result of long-term use. , Thin plate sliding contact member 1
It can be said that there is no case in which 00 is worn out by sliding contact with the widthwise left and right ends of the inner seal band 30 and separated vertically (FIG. 13). Even in such a case, since the slide contact member 100 is still attached to the left and right side surfaces 20c in the separated state, the sliding contact member 100 does not separate from the left and right side surfaces 20c and become a foreign matter inside the tube 2, and the internal moving body 20 slides. Does not hinder the

Next, another embodiment will be described. The same parts as those in the first embodiment are designated by the same reference numerals. 14,
In the embodiment shown in FIG. 15, the upper edge portions 93c and 93Cc of the recesses 93 and 93C are provided in the same manner as in the first embodiment .
Contact surfaces 30Ae, 30B of the seal bands 30A, 30B
e is abutted and guided to suppress the deviation in the width direction. In FIG. 14, the recess 93 of the band guide 90 is similar to that of the first embodiment, and the contact surface 30A of the inner seal band 30A is changed.
The entire shape of the inner surface, which is e, is formed into an arc surface (curved surface) . Oite the sealing band 30B in FIG. 15 is a contact surface (inclined surface) 30Be widthwise sides multistage inclined inner surface which is the lower part, comments sectional shape 93C recess
(Curved surface).

[0039]

In the embodiment shown in FIG . 16, the depression 93 is provided.
The cross section of D has a trapezoidal shape similar to that of the first embodiment,
The inclined surface 93Db of the recess 93D is formed on the inner seal band 30.
Band guide surface 93Db having the same inclination angle as the contact surface 30e
As the contact surface 30e of the inner seal band 30,
The inner seal band 30 is abutted and guided by the inner surface 93Db.
This is to suppress the deviation in the width direction.

In the embodiment shown in FIG . 17, the inner surface of the inner seal band 30A is an arc-shaped contact surface 30Ae,
The abutment surface 30Ae is abutted and guided by the band guide surface 93Fb, which is an inclined surface of the recess 93F, to prevent the widthwise displacement.

In the embodiment shown in FIG . 18, the first embodiment
From the inclined surface 30e of the inner seal band 30 having the same shape as
Inclination of band guide surface 93 (inclined surface) Gb of depression 93G
The angle is set small, and the inside of the inner seal band 30
Touch the edge 30g of the side width direction end to the band guide surface 93Gb.
The guides are in contact with each other to suppress the deviation in the width direction.

In each of the above-described embodiments, at least the inner seal band or the recess has the abutment surface or the band guide surface having a downward slope toward the center in the width direction. Suitable because the centripetal force acts
Is.

[0044]

As described above, in the present invention, the band guide
Between the left and right sides of the section with a narrower width than between the sides.
Cylinder hole of the inner seal band in the recess
The inner side of the seal band facing toward the side is curved or curved on both sides in the width direction.
Guides the contact surface, which is an inclined surface ,
Even if there is a gap between the side surface of the band guide portion and both ends of the inner seal band in the width direction, the widthwise displacement of the inner seal band with respect to the slit is suppressed. This improves the durability of the inner seal band and prevents the piston packing from wearing. Further, fluid leakage from the inside is reduced, and the moving member moves smoothly.

Further, in the present application, the inner seal band portion between the band guide portions is also formed inside the band guide groove of the inner movable body by slidably contacting both ends in the width direction of the inner seal band with the thin plate sliding contact member. Since the left and right positions of the seal band are regulated, fluid leakage is further reduced, and movement of the moving member in the longitudinal direction is extremely smooth. At this time, by suppressing the widthwise displacement due to the contact between the recess and the inner seal band, the thin plate sliding contact member is prevented from being worn out due to the sliding contact of the side end portion with the thin plate sliding contact member, and the thin plate sliding contact member is not scratched. It becomes difficult to attach. Further, since the sliding contact member is provided in the band passage groove as a member separate from the inner moving body, a material having high wear resistance can be adopted in addition to the material forming the band passage groove, and the band width and the groove of the band passage groove can be adopted. Even if there is a manufacturing error in the width, this can be dealt with by appropriately selecting the thickness of the sliding contact member to be mounted, and highly accurate processing is not required.

Further, in the present application, even if the sliding contact member is worn out by sliding contact with the end portion of the inner seal band and is separated into upper and lower parts, the separated upper and lower sliding contact members are left and right in the separated state. Since it remains attached to the side wall, the sliding contact member does not separate from the left and right side surfaces and does not float as foreign matter inside the tube,
Does not hinder the sliding of the internal moving body.

Further, in the present application, since both widthwise end portions of the inner seal band do not contact the side surfaces of the band passage groove of the outer moving body, abrasion powder is generated from the outer moving body side when the outer moving body is metallic. And the inner seal band can have a long life.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rodless cylinder.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a front view of a piston end.

FIG. 5 is a plan view of FIG.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is an enlarged cross-sectional view showing the relationship between the inner seal band and the depression.

FIG. 8 is a side view showing a state in which a guide member, a shim and the like are attached to a moving member.

FIG. 9 is an exploded perspective view showing a moving member, a guide member, and a shim.

FIG. 10 is a side view of a guide member.

11 is a plan view of FIG.

12 is a front view of FIG.

FIG. 13 is an explanatory diagram when the thin plate sliding contact member is worn.

FIG. 14 is a second embodiment.

FIG. 15 shows a third embodiment.

FIG. 16 is a fourth embodiment.

FIG. 17 shows a fifth embodiment.

FIG. 18 shows a sixth embodiment.

FIG. 19 is a conventional technique.

[Explanation of symbols]

1 Rodless Cylinder 2 Tube 2a Cylinder Hole 3 Slit 20 Piston (Inner Moving Body) 20a Piston Part 20b Band Passing Groove 21 Piston End 21a Piston Packing 26 Mount (Outer Moving Body) 30 Inner Seal Band 30a Outer Side 30b Inside Edge 30c Inside Side surface 30e Contact surface 30f Side end portion 30g Edge portion 90 Band guide portion 93 Indentation 93b Sloping surface 93c Top edge portion 93Db Band guide surface 100 Sliding contact member (thin plate sliding contact member)

Claims (8)

(57) [Claims] 1. A movement of an inner moving body inside the tube is transmitted to an outer moving body outside the tube via a slit provided in the tube in a longitudinal direction, and the slit is a band guide provided at one longitudinal end of the inner moving body. In the rodless cylinder that is blocked by the inner seal band that passes through the band guide groove at the other longitudinal end through the band passage groove of the inner moving body, the band guide portion includes the right and left side surfaces of the band guide portion.
The width of the inner seal band is
At both sides in the width direction of the seal band on the inner surface facing the binder hole side
Guide the abutting surface that is a curved surface or inclined surface by abutting
Rodless cylinder, which is provided with a recess for preventing deviation in the band width direction . 2. The movement of an inner moving body inside the tube is transmitted to an outer moving body outside the tube through a longitudinal slit provided in the tube, and the slit is a band guide provided at one longitudinal end of the inner moving body. In the rodless cylinder that is blocked by the inner seal band that passes through the band guide groove at the other longitudinal end through the band passage groove of the inner moving body, the band guide portion includes the right and left side surfaces of the band guide portion.
In between, on both sides in the width direction that is narrower than the width between those sides
It has an inclined surface with a downward slope toward the center of the cylinder hole.
Seal band on the inner side facing the cylinder hole side of the roll band
A rodless cylinder characterized in that recesses are provided to prevent contact in the width direction of the seal band by abutting and guiding the abutting surfaces that are inclined surfaces on both sides in the width direction . 3. The rodless cylinder according to claim 2, wherein the upper edge of the recess is configured to contact and guide the contact surface of the inner seal band. 4. The inner seal band is brought into contact with the inclined surface of the depression.
Band guide surface with the same inclination angle as the surface
3. The rodless cylinder according to claim 2, wherein the contact surface of the inner seal band is configured to contact and be guided to the inner surface . 5. The inner seal band has an edge portion at left and right ends in the width direction of an outer surface opposite to the inner surface facing the cylinder hole side, and both width direction side portions of the inner surface incline toward the edge portion. The contact surface is chamfered to the inclined surface, and the inclined surface of the recess is formed to have a larger inclination angle than the contact surface of the inner seal band whose width becomes narrower toward the center of the cylinder hole, The rodless cylinder according to claim 3, wherein the abutting surface is configured to abut and guide the upper end edge of the inclined surface. 6. A slide contact member at a side end of the band for slidingly guiding both end portions in the width direction of the inner seal band is provided inside a side surface of a band passage groove of the inner moving body, so that a lateral displacement of the inner seal band with respect to a slit is prevented. 6. The recess is formed in the band guide portion and the sliding contact member provided in the band passage groove of the inner moving body is used to suppress it.
Rodless cylinder according to item. 7. A sliding member, rodless cylinder according to claim 6, wherein a thin plate sliding member to be attached to the left and right sides of the band passage grooves of the inner moving body. 8. A piston end provided with piston packings provided at both longitudinal ends of a piston portion constituting an inner moving body of the rodless cylinder according to claim 2, wherein an outer periphery on a slit side. The band guide portion formed on the surface has, between the left and right side surfaces of the band guide portion, an inclined surface that is narrower than the distance between the side surfaces and has a downward slope toward the center of the cylinder hole on both sides in the width direction. An indentation was provided to prevent displacement in the seal band width direction by abutting and guiding the contact surfaces that are inclined surfaces on both sides of the inner seal band facing the cylinder hole side in the seal band width direction. Rodless cylinder piston end.