JP2865882B2 - Air actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an air actuator using a diaphragm.

[0002]

2. Description of the Related Art In general, an air actuator using a diaphragm or a rolling diaphragm has a peripheral bead sandwiched between a cylindrical cylinder body and a bonnet, and a pressure is applied between the diaphragm and the bonnet. It has a configuration that defines a chamber.
By supplying compressed air to the pressure chamber, the diaphragm and a piston integrated therewith are operated to perform some work.

FIGS. 6 and 7 show a conventional example of this air actuator. FIG. 6 shows the fastening flanges 1a and 1a protruding outward from the cylinder body 1 and the bonnet 2, respectively.
b, and the fastening flanges 1a and 2a are fixed by bolts and nuts 3, whereby the peripheral bead portion 4a of the rolling diaphragm 4 is clamped between the end surface of the cylinder body 1 and the end surface of the bonnet 2. An air supply port 5 is opened in the bonnet 2, and compressed air is supplied from the air supply port 5 to a pressure chamber 6 defined by the bonnet 2 and the rolling diaphragm 4, so that the rolling diaphragm 4 and the rolling diaphragm 4 are compressed. Is moved. However, this conventional example, however, has a problem of increasing the size because the fastening flanges 1a and 2a projecting in the radial direction are indispensable.

FIG. 7 shows a conventional example in which a fastening flange is not required.
Is formed, and a bead-clamping step 1c is formed at the back of the hood insertion hole 1b. The bonnet 2 is inserted into the insertion hole 1b, and clamps the peripheral bead portion 4a of the rolling diaphragm 4 between the inner end thereof and the bead clamping step 1c. The bonnet 2 is fixed to the cylinder body 1 by a stop ring 8 inserted into an insertion groove 1d on the inner periphery of the bonnet insertion hole 1b. According to this conventional example, the fastening flange is certainly unnecessary, but the air supply port 5 must be formed by the supply port 5a of the cylinder body 1 and the supply port 5b of the bonnet 2.
Further, in order to prevent air leakage from the gap between the insertion hole 1b and the bonnet 2, an O-ring 9 surrounding the supply ports 5a and 5b must be provided on the fitting surface of the two, and the structure around the air supply port 5 is It's complicated.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide an air actuator in which the size in the radial direction is not increased and the structure around the air supply port is not complicated. .

[0006]

SUMMARY OF THE INVENTION The present invention has achieved the above object by improving the shape of a fitting portion between a cylinder body and a bonnet. The present invention sandwiched a peripheral bead of the diaphragm between the tubular cylinder body and the bonnet, the air actuator defining a pressure chamber between the diaphragm and the bonnet, the tubular cylinder
At the bonnet side end of the body , a bonnet insertion hole, a bead pinching step formed at the back of the bonnet insertion hole,
Orient in the direction parallel to the axial direction of the cylinder body, and
An open end face communicating with the slot insertion hole, and a flat fitting in which the bead portion of the diaphragm is fitted to the bonnet insertion hole of the cylinder body and clamps the bead clamping end portion to the bonnet. Part and the flat fitting part
Radial and protruding beauty axis fitted to the end face opening groove
An axial projection is provided integrally with the bonnet in the radial direction.
Further, an air supply port to the pressure chamber is formed in the axial projection .

According to this structure, the air supply port is provided only in the radial and axial projections of the bonnet, so that the structure around the air supply port is simplified. In addition, the fixing structure for fixing the bonnet can be configured by, for example, forming a stop ring insertion groove on the inner surface of the bonnet insertion opening of the cylinder body, so that a fastening flange is unnecessary.
Therefore, the diameter is not increased.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
The cylindrical cylinder body 11 has a circular bonnet insertion hole 11a at one end thereof.
A bead sandwiching step 11b is formed at the back of "a".
The cylinder body 11 communicates with a portion of the bonnet insert hole 11a, the end surface opening which opens in the radial direction and an end face
An opening groove 11c is formed. This end face opening groove 11c
Has a flat rectangular shape, and its inner portion extends further deeper than the bead holding step 11b to form a step 11d. The cylinder body 11 also has a bonnet insertion hole 11.
A bearing 11f is provided at the end opposite to the end a, and the piston rod 14 of the piston 13 is slidably supported by the bearing 11f. 11e shows an air breathe hole.

The bonnet 12 is formed by the cylinder body 11
A flat fitting portion (circular portion) 12a that fits in the hood insertion hole 11a, and the flat fitting portion 12a
It has a radially and axially protruding portion 12b that protrudes in the axial direction of the cylinder body side and fits into the end face opening groove 11c. The flat fitting portion 12a clamps the peripheral bead portion 15a of the rolling diaphragm 15 between the flat fitting portion 12a and the bead clamping step portion 11b, and has a falling-off preventing rib 12c on the inner peripheral surface of the inner end thereof.
The radial and axial projections 12b fit into the end face opening grooves 11c substantially without gaps.
6 are drilled. This air supply port 16 communicates with a pressure chamber 17 formed by the bonnet 12 and the rolling diaphragm 15.

The bonnet insertion hole 11 of the cylinder body 11
An annular stop ring groove 11g is formed on the inner periphery of the inner ring a. A stop ring 18 fitted into the stop ring groove 11g prevents the hood 12 inserted into the hood insertion hole 11a from coming off and fixed. I have. The stop ring 18, an annular overall, but a part of which is cut, the cutting both end portions 18a is an end-face opening groove 11c
Located within. The rolling diaphragm 15 is put on the piston 13 and moves substantially integrally with the piston 13. 19 is a compression spring for urging the piston 13 to move toward the pressure chamber 17 side.

Accordingly, the air actuator (air cylinder device) having the above-described structure is provided with the bonnet insertion hole 11a with the peripheral bead 15a of the rolling diaphragm 15 set on the bead holding step 11b of the cylinder body 11.
The flat fitting portion 12a in a, radial and axial to the through groove 11c
The direction projections 12b are fitted respectively. When the stop ring 18 is fitted in the stop ring groove 11g, the assembly is completed. In this state, the peripheral bead portion 15a of the rolling diaphragm 15 has a bead clamping step portion 11b,
The flat fitting portion 12a and the falling-off prevention rib 12c are compressed in a state where they are prevented from falling off, and a pressure chamber 17 is defined between the rolling diaphragm 15 and the bonnet 12. The radial and axial projections 12b are open end grooves 11c.
, The bonnet 12 does not rotate. The air supply port 16 is provided in the radial and axial projections 12.
Since the bonnet 12 is formed only on the b, the structure around the air supply port 16 is simple, and the stop ring 18 prevents the bonnet 12 from coming off. When compressed air is supplied from the air supply port 16 into the pressure chamber 17, the rolling diaphragm 15 and the piston 13 move against the force of the compression spring 19, and work is performed by the piston rod 14.

In the above embodiment, the bonnet 12 is fixed to the cylinder main body 11 by the stop ring 18 but may be fixed to the cylinder main body 11 by other means. For example, bonnet insertion hole 11
It is also possible to fix the bonnet 12 by a fixing ring screwed to a. In the above description, the rolling diaphragm 15 is used as the diaphragm, and the present invention is applied to an air actuator that moves the piston 13 by the rolling diaphragm 15. However, the present invention is applicable to other actuators such as an on-off valve using an ordinary diaphragm. The present invention can also be applied to the air actuator.

[0013]

According to the present invention, in a pneumatic actuator in which a peripheral bead of a diaphragm is sandwiched between a cylindrical cylinder body and a bonnet and a pressure chamber is defined between the diaphragm and the bonnet, It is possible to obtain an air actuator in which the structure for fixing the main body and the hood does not become large and the structure around the air supply port to the pressure chamber is not complicated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part showing an embodiment of an air actuator of the present invention.

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

FIG. 3 is a sectional view taken along the line AA in FIGS. 2 and 5;

FIG. 4 is a sectional view taken along the line BB of FIG. 5;

FIG. 5 is a right side view of FIG. 3;

FIG. 6 is a sectional view of a main part showing an example of a conventional air actuator.

FIG. 7 is a sectional view of a main part showing another example of a conventional air actuator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Cylinder main body 11a Bonnet insertion hole 11b Bead holding step 11c End face opening groove 11g Stop ring groove 12 Bonnet 12a Flat fitting part 12b Radial and axial projection 13 Piston 14 Piston rod 15 Rolling diaphragm 15a Peripheral bead 16 Air Supply port 17 Pressure chamber 18 Stop ring 19 Compression spring

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-85276 (JP, U) JP-A-2-117404 (JP, U) JP-B-45-6208 (JP, Y1) JP-B-45 20092 (JP, Y1) (58) Field surveyed (Int. Cl. ⁶ , DB name) F15B 15/10

Claims (2)

(57) [Claims] 1. An air actuator for sandwiching a peripheral bead of a diaphragm between a cylindrical cylinder body and a bonnet and defining a pressure chamber between the diaphragm and the bonnet, wherein the bonnet of the cylindrical cylinder body is provided. At the side end, a bonnet insertion hole, a bead clamping step formed at the back of the bonnet insertion hole, and a direction parallel to the axial direction of the cylinder body
And an end face opening groove communicating with the bonnet insertion hole is provided, and the bonnet is fitted in the bonnet insertion hole of the cylinder main body, and the bead portion of the diaphragm is sandwiched between the bonnet and the bead clamping end portion. Between the fitting part and this flat fitting part
From the radial direction and the axial direction on the cylinder body side
An air actuator, wherein a radial and an axial projection to be fitted in the mouth groove are provided integrally, and an air supply port to the pressure chamber is formed in the radial and the axial projection of the bonnet. . 2. The air actuator according to claim 1, wherein an insertion groove of a stop ring for fixing the bonnet is formed on an inner surface of the bonnet insertion opening of the cylinder body.