JPH04236803A - Actuator - Google Patents

Abstract

PURPOSE:To make a dimension in the radial direction not large and prevent a structure around an air supply port from becoming complex by providing the end part of a cylinder body with a bonnet inserting port, a bead holding step and a penetration groove, arranging a flat fitting part and radial direction projection part to a bonnet in one body and drilling an air supply port in a projection part in the radial direction. CONSTITUTION:The end part of a cylinder body 11 is provided with a bonnet inserting hole 11a, a bead holding step part 11b formed in the depth thereof and a penetration groove 11c which communicates to a part of the bonnet inserting hole 11a and opens, in the radial direction and at the end face, of the cylinder body 11. A bonnet 12 is provided with a flat fitting part 12a, which is fitted in the bonnet inserting hole 11a of the cylinder body 11 and holds the bead part of a diaphragm between the bead holding stop part 11b and itself and a projection part 12b in the radial direction fitting in the penetration groove 11c, in one body. In addition, an air supply port 16 to a pressure chamber is drilled in this projection part 12b in the radial direction.

Description

[Detailed description of the invention]

0001

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

0002

[Prior art and its problems] Air actuators using a diaphragm or rolling diaphragm generally sandwich a peripheral bead of the diaphragm between a cylindrical cylinder body and a bonnet, and apply pressure between the diaphragm and the bonnet. It has a configuration that defines a chamber. By supplying compressed air to this pressure chamber, the diaphragm and the piston integrated therewith are operated to perform some work.

FIGS. 6 and 7 show conventional examples of this air actuator. FIG. 6 shows fastening flanges 1a and 1 protruding outward from the cylinder body 1 and the bonnet 2, respectively.
b, and by fixing the fastening flanges 1a and 2a with bolts and nuts 3, the peripheral bead portion 4a of the rolling diaphragm 4 is sandwiched 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 The piston 7, which is integrated with the piston 7, is moved. However, this conventional example requires the fastening flanges 1a and 2a that protrude in the radial direction, so there is a problem in that it becomes large.

FIG. 7 shows a conventional example that does not require a fastening flange, and the end of the cylinder body 1 has a bonnet insertion hole 1b.
is formed, and a bead clamping stepped portion 1c is formed at the inner part of this bonnet insertion hole 1b. The bonnet 2 is inserted into the insertion hole 1b, and the peripheral bead portion 4a of the rolling diaphragm 4 is sandwiched between the inner end portion of the bonnet 2 and the bead sandwiching stepped portion 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 circumference of the bonnet insertion hole 1b. According to this conventional example, a 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.
Furthermore, in order to prevent air leakage from the gap between the insertion hole 1b and the bonnet 2, it is necessary to provide an O-ring 9 surrounding the supply ports 5a and 5b on the fitting surfaces of the two, and the structure around the air supply port 5 is It got complicated.

[0005]

[Object of the Invention] An object of the present invention is to solve the above-mentioned problems of the conventional example, and to obtain an air actuator that does not have large radial dimensions and does not have a complicated structure around the air supply port. .

[0006]

SUMMARY OF THE INVENTION The present invention achieves the above object by improving the shape of the fitting portion between the cylinder body and the bonnet. The present invention provides an air 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. A bonnet insertion hole facing the direction, a bead clamping step formed in the deep part of this bonnet insertion hole, and a through groove that communicates with a part of this bonnet insertion hole and opens in the radial direction and end face of the cylinder body. A flat fitting part that fits into the bonnet insertion hole and clamps the bead part of the diaphragm between the bead clamping end part and a radial protrusion part that fits into the through groove are integrated into the bonnet. The bonnet is provided with an air supply port to the pressure chamber in the radial projection of the bonnet.

According to this structure, since the air supply port is provided only in the radial projection of the bonnet, the structure around the air supply port is simplified. Furthermore, the fixing structure for fixing the bonnet can be constructed 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 not required. Therefore, the diameter does not increase.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to illustrated embodiments. The cylindrical cylinder body 11 has a circular bonnet insertion hole 11a at one end thereof.
A bead clamping stepped portion 11b is formed in the inner part of a. The cylinder body 11 is formed with a through groove 11c that communicates with a part of the bonnet insertion hole 11a and opens in the radial direction and end face thereof. The through groove 11c has a rectangular planar shape, and its inner part extends further back than the bead clamping step part 11b to form a step part 11d. The cylinder body 11 is also provided with a bearing portion 11f at the end opposite to the bonnet insertion hole 11a.
A piston rod 14 of a piston 13 is slidably supported. 11e indicates an air breath hole.

[0009] The bonnet 12 is attached to this cylinder body 11.
It has a flat fitting part (circular part) 12a that fits into the bonnet insertion hole 11a, and a radial projection part 12b that fits into the bead clamping stepped part 11b. The flat fitting part 12a clamps the peripheral bead part 15a of the rolling diaphragm 15 between it and the bead clamping step part 11b, and has an inner circumferential surface at its inner end.
It has a falling-off prevention rib 12c. The radial protrusion 12b is
It fits into the through groove 11c with virtually no gaps, and an air supply port 16 is bored therein. This air supply port 1
6 communicates with a pressure chamber 17 formed by the bonnet 12 and the rolling diaphragm 15.

Bonnet insertion hole 11 of cylinder body 11
An annular stop ring groove 11g is formed on the inner circumference of a, and the stop ring 18 fitted into the stop ring groove 11g prevents the bonnet 12 inserted into the bonnet insertion hole 11a from coming off. There is. The stop ring 18 has an annular shape as a whole and is partially cut off, and both cut ends 18a are located in the through groove 11c. The rolling diaphragm 15 is placed over the piston 13 and moves substantially integrally with the piston 13. A compression spring 19 biases the piston 13 toward the pressure chamber 17.

Therefore, in the present air actuator (air cylinder device) having the above configuration, the peripheral bead portion 15a of the rolling diaphragm 15 is set in the bead clamping step portion 11b of the cylinder body 11, and the bonnet insertion hole 11 is
The flat fitting portion 12a is fitted to the hole a, and the radial protrusion 12b is fitted to the through groove 11c. Then, when the stop ring 18 is fitted into the stop ring groove 11g, the assembly is completed. In this state, the peripheral bead portion 15a of the rolling diaphragm 15 is compressed and prevented from falling off by the bead clamping stepped portion 11b, the flat fitting portion 12a, and the falling-off prevention rib 12c, and the rolling diaphragm 15 and the bonnet 12 are A pressure chamber 17 is defined in between. Since the radial protrusion 12b fits into the through groove 11c, the bonnet 12 does not rotate. The air supply port 16 is
Since it is formed only on the radial protrusion 12b, the structure around the air supply port 16 is simple, and the stop ring 18
Since the bonnet 12 is prevented from coming off, it does not become larger in the radial direction. When compressed air is supplied into the pressure chamber 17 from the air supply port 16, 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 body 11 using the stop ring 18, but the bonnet 12 may be fixed to the cylinder body 11 by other means. For example, bonnet insertion hole 11
It is also possible to fix the bonnet 12 by means of a fixing ring that is screwed into the bonnet 12. Furthermore, in the above description, the present invention is applied to an air actuator that uses the rolling diaphragm 15 as a diaphragm and moves the piston 13 by the rolling diaphragm 15, but the present invention is also applicable to an on-off valve that uses a normal diaphragm, etc. It can also be applied to air actuators.

[0013]

According to the present invention, in an air 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, the cylinder It is possible to obtain an air actuator in which the fixing structure between the main body and the bonnet does not become large, and the structure around the air supply port to the pressure chamber does not become complicated.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of essential parts showing an embodiment of an air actuator of the present invention.

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

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

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

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

FIG. 6 is a cross-sectional view of essential parts of an example of a conventional air actuator.

FIG. 7 is a sectional view of essential parts of another example of a conventional air actuator.

[Explanation of symbols]

11 Cylinder body 11a Bonnet insertion hole 11b Bead clamping stepped part 11c Through groove 11g Stop ring groove 12 Bonnet 12a Flat fitting part 12b Radial protrusion 13 Piston 14 Piston rod 15 Rolling diaphragm 15a Peripheral bead part 16 Air supply port 17 Pressure chamber 18 Stop ring 19 Compression spring

Claims (2)

[Claims] Claims: 1. An air 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. A bonnet insertion hole, a bead clamping step formed in the inner part of the bonnet insertion hole, and a through groove that communicates with a part of the bonnet insertion hole and opens in the radial direction and end face of the cylinder body are provided. a flat fitting portion that fits into the bonnet insertion hole of the cylinder body and pinches the bead portion of the diaphragm between the bead pinching end portion; and a radial projection portion that fits into the through groove. An air actuator characterized in that an air supply port to the pressure chamber is formed in a radial protrusion of the bonnet. 2. The air actuator according to claim 1, wherein an insertion groove for a stop ring for fixing the bonnet is formed on the inner surface of the bonnet insertion opening of the cylinder body.