JPH0559053U - Rodless cylinder device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a rodless cylinder device, the number of packing parts and the number of steps for mounting the packing are reduced to reduce the cost. In the rodless cylinder device, a cushion pipe 9 communicating with the supply / discharge port 8 is provided at an inner end portion of an end cover 11, and a cushion hole 10 is formed at a position of an end portion of a piston 6 corresponding to the cushion pipe 9. The piston packing 12 provided at the end of the piston 6 has a multi-functional structure in which at least the seal packing part 17 and the cushion packing part 15 are integrally molded with nitrile rubber.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rodless cylinder device, and more particularly to a technique effectively applied to a structure of a packing provided at an end portion of a piston.

[0002]

[Prior Art]

 In the conventional rodless cylinder device, a cushion packing is provided at the end of the piston, and a seal packing is fitted on the outer peripheral surface near the end of the piston.

[0003]

[Problems to be solved by the device]

 However, in the structure of the rodless cylinder device described above, since the cushion packing and the seal packing are provided separately at the end of the piston, the number of packing parts and the man-hours for packing are increased, resulting in high cost. There was a problem of getting stuck.

An object of the present invention is to provide a rodless cylinder device that can reduce the number of packing parts and the number of steps for mounting the packing and can reduce the cost.

The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

[0006]

[Means for Solving the Problems]

 The following is a brief description of the outline of the typical invention disclosed in the present application.

The rodless cylinder device of the present invention has a cushion hole formed at the end of the piston and an inner end of the end cover, communicates with the supply / discharge port, and slides in the cushion hole. It is a rodless cylinder device equipped with a possible cushion pipe, and the piston packing provided at the end of the piston has a multi-functional structure in which at least the seal packing part and the cushion packing part are integrally molded with the same material. It is a thing.

In this case, the piston packing can be attached to the end of the piston by fitting.

[0009]

[Action]

 According to the above-described rodless cylinder device of the present invention, the piston packing provided at the end of the piston has a multi-functional structure in which at least the seal packing part and the cushion packing part are integrally molded with the same material. It is possible to reduce the cost by reducing the number of parts and man-hours for packing.

In this case, since the piston packing has a structure to be attached to the end of the piston by fitting, the piston packing can be attached to the end of the piston with one touch, and the number of steps for attaching the packing can be further reduced. ..

[0011]

Embodiment 1 FIG. 1 is a sectional view showing a rodless cylinder device which is Embodiment 1 of the present invention, FIG. 2 is an enlarged sectional view showing an essential part of the rodless cylinder device of FIG. 1, and FIG. FIG. 3 is an enlarged front view showing a main part of a rodless cylinder device.

The rodless cylinder device in the first embodiment has a cylinder tube 1. A slit portion 2 extending in the axial direction is formed in the cylinder tube 1, and an outer seal band 3 and an inner seal band 4 are attached to the slit portion 2 so as to face each other. The inner seal band 4 has a function of preventing dust from entering, and a function of sealing air leakage from the slit portion 2.

A piston mount 5 is slidably provided on the outer peripheral surface of the cylinder tube 1, and a piston yoke 7 for transmitting the moving force of the piston 6 is provided to the piston mount 5 so as to penetrate the slit portion 2. The piston yoke 7 moves while pressing the inner seal band 4 and the outer seal band 3 separately, and after the movement, the inner seal band 4 again sticks to the slit portion 2 and the inner surface is sealed by air pressure.

A cushion pipe 9 communicating with the supply / discharge port 8 is provided at the inner end of the end cover 11, and a cushion hole 10 is formed at a position of the end of the piston 6 corresponding to the cushion pipe 9. By fitting the cushion pipe 9 into the cushion hole 10, the exhaust flow rate is throttled through the needle valve 25, and the inertia force of the piston 6 at the stroke end is absorbed.

The first embodiment is characterized in that the piston packing 12 provided at the end of the piston 6 has a multi-functional structure.

That is, the piston packing 12 has a packing body 13. The packing main body 13 has a disk shape having the same diameter as the piston 6, and a hole 14 for allowing the cushion pipe 9 to come in and out is formed at the center thereof. A lip-type cushion packing portion 15 for sealing with the outer peripheral surface of the cushion pipe 9 is integrally formed at the opening end of the hole 14. A lip-type seal packing portion 17 that seals with the inner peripheral surface of the cylinder chamber 16 is integrally formed on the outer peripheral surface of the packing body 13.

An attachment hole 18 is formed in the packing body 13, and the piston packing 12 is attached to the end portion of the piston 6 via an attachment bolt 19 inserted into the attachment hole 18.

Next, the operation of the first embodiment will be described.

When manufacturing the piston packing 12 having the above structure, a mold having a cavity corresponding to the piston packing 12 is used, and molten nitrile rubber is poured into the cavity of the mold to form the cushion packing part 15 and the seal packing part 17. An integrally molded piston packing 12 is formed. Next, the surface of the piston packing 12 is subjected to a halide treatment.

When the piston packing 12 is attached to the piston 6, the piston packing 12 is attached to the end portion of the piston 6 via the mounting bolt 19 that is inserted into the mounting hole 18.

Regarding the sealing action of the piston packing 12, when the piston 6 moves to the stroke end, the cushion pipe 9 is fitted into the cushion hole 10, and the cushion packing portion 15 is pneumatically pressed against the outer peripheral surface of the cushion pipe 9. Internal leakage between the outer peripheral surface of cushion pipe 9 and the inner peripheral surface of cushion hole 10 is prevented.

Further, when the piston 6 reciprocates, the seal packing portion 17 is pressed against the inner peripheral surface of the cylinder chamber 16 by air pressure to prevent internal leakage between the inner peripheral surface of the cylinder chamber 16 and the outer peripheral surface of the piston 6. To be done.

As described above, the piston packing 12 has the multi-functional structure in which the seal packing part 17 and the cushion packing part 15 are integrally molded, so that the number of packing parts and the number of steps for mounting the packing are reduced, and the cost is reduced. The cost can be reduced.

[0024]

Second Embodiment FIG. 4 is an enlarged sectional view showing a main part of a rodless cylinder device according to a second embodiment of the present invention.

The rodless cylinder device of the second embodiment has substantially the same structure as that of the first embodiment, but the piston packing 12a includes a damper part 20 in addition to the cushion packing part 15 and the seal packing part 17. This is an integrally molded, multi-functional structure that further reduces the number of packing parts and lowers the cost.

Further, a flange 21 is formed at the opening end of the cushion hole 10, and an outer peripheral groove 22 is formed at the outer peripheral surface near the end of the piston 6, whereas the piston packing 12 has the above-mentioned outer peripheral surface of the packing body 13. An inner peripheral fitting portion 23 that fits into the outer peripheral groove 22 is formed, and an inner peripheral groove 24 that fits with the flange 21 is formed between the inner peripheral fitting portion 23 and the damper portion 20. The piston packing 12a is attached to the end portion of the piston 6 with one touch, and the number of steps for mounting the packing is further reduced.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say.

For example, in the first embodiment described above, the case where the piston packing is attached to the end portion of the piston via the mounting bolt has been described. However, the present invention is not limited to this. Can be installed by.

In the first embodiment, the case where the piston packing has a disk shape has been described, but the present invention is not limited to this, and the piston packing has an elliptical plate shape corresponding to the elliptical cross section of the cylinder tube. You can

In the above description, the invention mainly made by the present inventor is applied to a rodless cylinder device that operates by air pressure, which is the field of use of the device. However, the invention is not limited to this. It can also be applied to the less cylinder device.

[0031]

The effects obtained by the typical ones of the inventions disclosed in the present application will be briefly described as follows.

(1). Since the piston packing provided at the end of the piston has a multi-functional structure in which at least the seal packing part and the cushion packing part are integrally molded with the same material, the number of packing parts and the packing mounting It is possible to reduce man-hours and reduce costs.

(2). Since the piston packing has a structure to be attached to the end portion of the piston by fitting, the piston packing can be attached to the end portion of the piston with one touch, and the number of steps for mounting the packing can be further reduced. ..

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a rodless cylinder device that is Embodiment 1 of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of the rodless cylinder device of FIG.

FIG. 3 is an enlarged front view showing a main part of the rodless cylinder device of FIG.

FIG. 4 is an enlarged cross-sectional view showing a main part of a rodless cylinder device that is Embodiment 2 of the present invention.

[Explanation of symbols]

 1 Cylinder tube 2 Slit part 3 Outer seal band 4 Inner seal band 5 Piston mount 6 Piston 7 Piston yoke 8 Supply / discharge port 9 Cushion pipe 10 Cushion hole 11 End cover 12 Piston packing 12a Piston packing 13 Packing body 14 Hole 15 Cushion packing part 16 Cylinder chamber 17 Seal packing part 18 Mounting hole 19 Mounting bolt 20 Damper part 21 Flange 22 Outer peripheral groove 23 Inner peripheral fitting part 24 Inner peripheral groove 25 Needle valve

Claims (2)

[Scope of utility model registration request] 1. A rod having a cushion hole formed at an end of a piston and a cushion pipe provided at an inner end of an end cover, communicating with a supply / discharge port, and slidable in the cushion hole. A rodless cylinder device, wherein the piston packing provided at the end of the piston has a multi-function structure in which at least a seal packing part and a cushion packing part are integrally molded of the same material. . 2. The rodless cylinder device according to claim 1, wherein the piston packing has a structure which is attached to an end portion of the piston by fitting.