JP3432191B2 - Pneumatic thin cylinder device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pneumatic thin cylinder device.

[0002]

2. Description of the Related Art Conventionally, as a thin cylinder device having a relatively short stroke given to a piston body, a peripheral edge portion of a diaphragm having a piston body integrated in a central portion is sandwiched between a pair of cylinder bodies. There is known a type in which compressed air is sent to and discharged from a pressure chamber formed between one of a pair of cylinder bodies and a diaphragm to give an axial stroke to a piston body. In this device, conventionally, in order to strictly determine the sliding direction of the piston body, a bearing portion which is in a fitting relationship with each other is provided between the piston body and the cylinder body.

However, if such a bearing portion is provided, a rod seal for sealing the leakage of compressed air from this bearing portion is required, which hinders the reduction in thickness and causes a cost increase. Further, in the conventional thin cylinder device, since the diaphragm can be deformed, the piston body is capable of not only axial movement but also slight rotation. However, it has been found that the diaphragm is strong against repeated deformation due to the axial movement of the piston body, but is very weak against deformation due to the rotation of the piston body, and the durability of the diaphragm is significantly impaired.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to obtain a pneumatic thin cylinder device which does not require a rod seal and can be further thinned based on the above-mentioned awareness of the problems of the conventional thin cylinder device. To do. It is another object of the present invention to provide a pneumatic thin cylinder device that can improve the durability of the diaphragm without the rotation of the piston body.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a fixing bolt for fixing a diaphragm defining a pressure chamber and a pair of cylinder bodies is made hollow, and a sliding guide shaft of a piston body is fitted into the hollow shaft portion to achieve a rod seal. A pair of cylinder bodies that are not required and have been made thinner, and according to one aspect thereof, are integrated with a diaphragm interposed therebetween;
A pressure chamber formed between one of the pair of cylinder bodies and the diaphragm; a piston body that abuts on the opposite side of the diaphragm from the pressure chamber and moves by a pressure change in the pressure chamber; Hollow fixing bolt, which is made to change, and slidably inserted into the hollow fixing bolt,
It has a sliding shaft connected to the piston body.

The hollow fixing bolt is preferably provided with a sliding bearing for a sliding shaft. By providing a pair of the hollow fixing bolt and the sliding shaft, the piston body can be prevented from rotating. The piston body can be composed of a main body and a sub body, which are connected to both ends of the pair of sliding shafts with a pair of cylinder bodies interposed therebetween.

According to another aspect of the present invention, a pair of cylinder bodies integrated with a diaphragm interposed therebetween and further fixed to a fixed base; formed on one of the sides of the pair of cylinder bodies abutting the fixed base. A piston body located in the through hole and abutting the diaphragm; a pressure chamber formed between the other of the pair of cylinder bodies and the diaphragm; and a piston body that is urged to move in a direction in which the volume of the pressure chamber decreases. Spring means inserted between the fixed base and the piston body; a pair of hollow fixing bolts that integrate a pair of cylinder bodies; a pair of hollow fixing bolts slidably inserted into the piston; It is characterized by having a pair of sliding shafts to which the main body is fixed; and a sub-piston body coupled to the other ends of the pair of sliding shafts.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A diaphragm 10 having a substantially rectangular plane shape used in a pneumatic thin cylinder device of this embodiment has fixing holes 11 at four corners of its periphery. The diaphragm 10 and the cylinder bodies 20 and 30 sandwiching the diaphragm 10 are connected to each other by a common pair of hollow fixing bolts 50, and a pressure chamber 21 is formed between the diaphragm 10 and the cylinder body 20 on the upper side in the drawing. . In the cylinder body 20, the pressure chamber 2
1, an intake / exhaust passage 22 for compressed air leading to 1 is formed,
Compressed air is supplied to the intake / exhaust passage 22 via a switching valve 23, a regulator 24, and a compressed air source 25.

That is, the hollow fixing bolt 50 has a hollow large diameter head portion 51 located in the stepped through hole 26 of the cylinder body 20 and a hollow small diameter male screw portion 52 screwed into the female screw hole 33 of the cylinder body 30. A sliding bearing 53 is press-fitted and fixed in the hollow large-diameter head portion 51. By fitting the hollow small diameter male screw portion 52 into the fixing hole 11 of the diaphragm 10 and screwing it into the female screw hole 33 of the cylinder body 30, the hollow large diameter head 51 is inserted into the stepped through hole 26 of the cylinder body 20 and tightened. The diaphragm 10 is sandwiched and held between the pair of cylinder bodies 20 and 30.

The fixed base B of the pair of cylinder bodies
The cylinder body 30 located on the side has a through hole 31 in the center thereof and a pair of recesses 32 extending in the radial direction from the through hole 31 on the surface of the fixed base body B side. The through hole 31 and the concave portion 32 form a space for accommodating the piston body (main body) 40.
It has a circular pressure receiving portion 41 corresponding to No. 1 and a radial arm portion 42 fitted in the pair of concave portions 32. In the pressure receiving portion 41,
A concave portion 43 facing the fixed base B is formed, and the piston body 40 is urged to move between the concave 43 and the fixed base B toward the pressure chamber 21 (in the direction in which the volume of the pressure chamber 21 decreases). The compression coil spring 44 is inserted. Due to the biasing force of the compression coil spring 44, the piston body 40 (the pressure receiving portion 41 thereof) is always in contact with the surface of the diaphragm 10 on the opposite side of the pressure chamber 21.

A sliding sleeve (sliding shaft) 54 is slidably inserted in the hollow fixing bolt 50, and a fixing screw 55 is attached to a lower end portion of the sliding sleeve 54 in the drawing.
The radial arm portion 42 of the piston body 40 is fixed. The sliding sleeve 54 is effectively a hollow fixing bolt 50.
Is slidingly guided by a slide bearing 53 fixed in the hollow large-diameter head 51. On the other hand, the piston sub body 45 is fixed to the upper end of the sliding sleeve 54 in the figure by a fixing screw 56, and the work W to which the movement of the piston body 40 is transmitted is fixed to the piston sub body 45. ing. The above-mentioned combined body of the diaphragm 10 and the cylinder bodies 20 and 30 sandwiching the diaphragm 10 is provided with another fixing bolt 60.
It is fixed to the fixed base B by (FIG. 1).

A pair of the hollow fixing bolt 50 and the members related thereto are provided at a position deviated from the axial center of the piston body 40 (piston sub body 45). ) Does not rotate. Further, since the hollow fixing bolt 50 and the members related thereto are not related to the formation of the pressure chamber 21, it is not necessary to apply a so-called rod seal, and the piston body 40
The sliding sleeve 54 that slidably guides the (piston sub body 45) to the cylinder bodies 20 and 30 is slidably fitted in the hollow fixing bolt 50 that connects the cylinder bodies 20 and 30. The overall thickness can be reduced.

The pneumatic thin cylinder device having the above structure operates as follows. In a state where the compressed air from the compressed air source 25 is not introduced into the pressure chamber 21 and the pressure chamber 21 is communicated with the atmosphere by the switching valve 23, the piston body 40 compresses the piston sub body 45 (workpiece W). The coil spring 44 is in a raised position protruding from the fixed base B by the force of the coil spring 44 (two-dot chain line in FIG. 3 or 4). The rising end of the piston body 40 at this time is regulated at a position where the radial arm portion 42 of the piston body 40 contacts the bottom portion of the recess 32 of the cylinder body 30. In this state, when the compressed air from the compressed air source 25 is introduced into the pressure chamber 21 via the switching valve 23 and the air pressure overcomes the compression coil spring 44, the piston body 40 (piston sub body 45) descends. (Retracted),
Work is performed by the work W. The maximum displacement amount d of the piston body 40 (workpiece W) is regulated at the position where the radial arm 42 of the piston body 40 contacts the fixed base body B (or the position where the piston sub body 45 contacts the upper surface of the cylinder body 20). It When the pressure chamber 21 is communicated with the atmosphere by the switching valve 23, the piston body 40 returns to the raised position by the force of the compression coil spring 44.

In the above embodiment, the pair of sliding sleeves 54 are connected to the piston sub body 45, and
Although 5 is connected to the work W, it is also possible to connect the work W directly to the sliding sleeve 54, and in this case, the piston sub body 45 is not required. Further, although the thin cylinder device is used as the retractable type in the above-described embodiments, if the work W is located on the same side as the fixed base B and is coupled to the piston body 40, it can be used as the push type. Also in this form, the piston sub body 45
Is unnecessary, and the piston body 40 (sliding sleeve 5
The fall prevention means of 4) may be provided.

[0015]

As described above, according to the present invention, a thin pneumatic thin cylinder device which does not require a rod seal can be obtained. Further, the pneumatic thin cylinder device capable of improving the durability of the diaphragm without the rotation of the piston body is obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a pneumatic thin cylinder device according to the present invention.

FIG. 2 is a sectional view of the same assembled state.

FIG. 3 is a cross-sectional view showing a state in which the piston body is moved to the maximum stroke.

FIG. 4 is an enlarged cross-sectional view showing a state before and after displacement of the piston body.

FIG. 5 is a bottom view of the same.

FIG. 6 is a plan view of the same portion as a cross section.

[Explanation of symbols]

10 diaphragm 11 fixing holes 20 30 cylinder body 21 Pressure chamber 22 Suction and exhaust passage 23 Switching valve 24 regulator 25 Compressed air source 26 Stepped through hole 31 through hole 32 recess 33 Female screw hole 40 Piston body (main body) 41 Pressure receiving part 42 Radial arm 43 recess 44 Compression coil spring (spring means) 45 Piston sub body (piston body) 50 hollow fixing bolt 51 hollow large diameter head 52 Hollow small diameter male thread 53 plain bearings 54 Sliding sleeve (sliding shaft) 55 56 Fixing screw B fixed base W work

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-50-12486 (JP, A) JP-A-53-118675 (JP, A) JP-A-56-42708 (JP, A) JP-A-60- 94829 (JP, A) Actual Kaihei 6-78604 (JP, U) Actual Kaihei 3-73706 (JP, U) Actual Public Sho 37-412 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F15B 15/10 F15B 15/14 335

Claims (5)

(57) [Claims] 1. A pair of cylinder bodies integrated with a diaphragm interposed therebetween; a pressure chamber formed between one of the pair of cylinder bodies and the diaphragm;
A piston body that abuts on the opposite side of the diaphragm to the opposite side of the pressure chamber and moves by a pressure change in the pressure chamber; a hollow fixing bolt that integrates the pair of bodies; and a slidably inserted into the hollow fixing bolt, A pneumatic thin cylinder device having a sliding shaft connected to the piston body. 2. The pneumatic thin cylinder device according to claim 1, wherein the hollow fixing bolt is provided with a sliding bearing for a sliding shaft. 3. The pneumatic thin cylinder device according to claim 1, wherein the hollow fixing bolt and the sliding shaft are provided in a pair. 4. The pneumatic thin cylinder device according to claim 3, wherein the piston body is composed of a main body and a sub body, which are connected to both ends of the pair of sliding shafts with a pair of cylinder bodies interposed therebetween. Pneumatic thin cylinder device. 5. A diaphragm is sandwiched between them to be integrated,
Further, a pair of cylinder bodies fixed to the fixed base body; a piston body positioned in one of the through holes formed in one of the pair of cylinder bodies on the side abutting the fixed base body and abutting the diaphragm; A pressure chamber formed between the other and the diaphragm; spring means inserted between the fixed base body and the piston body for urging the piston body to move in a direction in which the volume of the pressure chamber decreases; A pair of hollow fixing bolts that integrate the cylinder body; a pair of sliding shafts that are slidably inserted into the pair of hollow fixing bolts, and have the piston body fixed to one end thereof; and this pair of sliding shafts. And a sub-piston body connected to the other end of the pneumatic thin cylinder device.