JPH0326327Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a diaphragm actuator, and more specifically, improves the bearing structure of the diaphragm actuator to improve the durability of the diaphragm.

[Conventional technology]

The one shown in FIG. 3 has been widely known as a type of diaphragm actuator, and has the following configuration. That is, in the figure, reference numeral 1 indicates a cup in which both opening edges of an upper cup 1a and a lower cup 1b, each having a substantially sunken shape with a joint 2 attached to the top, are caulked and fixed, and a diaphragm 3 made of a flexible material is attached to the caulked portion.
The inner chamber of the cup 1 is partitioned into a pressure chamber 4 connected to the joint 2 and a second chamber 5 on the opposite side. Above and below the diaphragm 3, a diaphragm support 6 and a spring support 7, each having a substantially dish shape, are concentrically superimposed, and a hole is bored in the center of the three members 3, 6, 7, and one end of a rod 8 is fixed thereto. The rod 8 is loosely inserted into a shaft hole 9 formed at the center of the bottom surface of the lower cup 1b, and is supported via a bearing 10 so as to be able to reciprocate. bearing 10
is inserted into the space between the peripheral edge of the shaft hole of the lower cup 1b and the inner circumferential bent portion 11a of the annular bearing support 11 fixed to the bottom surface of the lower cup 1b, and is fitted into the annular groove 10a formed on the outer diameter surface. An O-ring 12 made of a rubber-like elastic material is brought into close contact with the circumferential surface of the inner circumferential bent portion 11a of the bearing support 11. A coil spring 13 is loaded in the axial direction between the spring support 7 and the bearing support 11, and the spring support 7,
The operating members such as the diaphragm 3 are elastically biased toward the pressure chamber 4 (upper side in the figure).

The diaphragm actuator having the above configuration is installed, for example, in the drive system of an automobile, and supplies and discharges high pressure such as compressed air from the joint 2 to the pressure chamber 4 to cause the rod 8 to reciprocate approximately in the axial direction. The link mechanism 14 connected to the lower end is driven.

[Problem that the invention attempts to solve]

By the way, when the above-mentioned actuator is installed in a car, the entire actuator will shake due to the shaking of the car. Due to this shaking, the actuating members of the actuator consisting of the diaphragm 3, diaphragm support 6, spring support 7, and rod 8, in addition to the normal operation of driving the link mechanism 14, undergo a large horizontal oscillation around the bearing 10. There is a problem in that fatigue accumulates in the diaphragm 3 made of a flexible material, which shortens the life of the diaphragm 3.

[Means for solving problems]

In view of the above points, the purpose of this invention is to extend the life of the diaphragm and improve its durability.To achieve this purpose, the inner chamber of the cup is constructed as a pressure chamber connected to the joint as described above. A diaphragm is disposed in the cup to partition the pressure chamber into a second chamber, and has a diaphragm elastically biased in a direction to reduce the volume of the pressure chamber. In a diaphragm actuator formed by inserting a fixed rod so as to be able to reciprocate, a bearing is attached to the circumferential surface of the rod at the center of gravity of an operating member such as the rod or diaphragm, and a bearing support is arranged concentrically with the shaft hole. is formed to extend in the axial direction to guide the reciprocating movement of the bearing.

[Effect]

In other words, in the actuator of the present invention, a bearing that supports the rod is attached to the rod side and at the center of gravity, and no matter what stroke position the rod is in with respect to the cup, the actuator such as the rod is always supported at the center of gravity. With this structure, even if the entire actuator shakes laterally, the shaking of the actuating member is suppressed as much as possible.

〔Example〕

Next, one embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, the same reference numerals as in FIG. 3 according to the conventional example above indicate the same or corresponding parts, that is, 1 is a cup consisting of an upper cup 1a and a lower cup 1b, 2 is a joint, and 3 is a cup made of an upper cup 1a and a lower cup 1b.
1 is a diaphragm, 4 is a pressure chamber, 5 is a second chamber, 6 is a diaphragm support, 7 is a spring support, 9 is a shaft hole, 13 is a coil spring, and 14 is a link mechanism plate.

A bearing 1 having a substantially semicircular cross section is located at the center of gravity of the actuating member consisting of the diaphragm 3, the diaphragm support 6, the spring support 7, and the rod 15 on the outer periphery of the rod indicated by the reference numeral 15.
6 is extrapolated and the inner diameter surface of the bearing 16 and the rod 1
The bearing 16 and the rod 15 are integrated by housing an O-ring 17 in annular grooves 15a and 16a formed oppositely on the circumferential surface. The inner circumferential bent portion 18a of the bearing support 18 fixed to the inside of the bottom surface of the lower cup 1b is formed to extend upward in the axial direction so as to constantly accommodate and guide the bearing 16 according to the stroke length of the rod 15. ,
Furthermore, as shown in FIG.
A clearance 19 of approximately 100 mm is provided. This clearance 19 serves to help the bearing 16 reciprocate smoothly, and in order to further smooth the reciprocating movement, molybdenum disulfide or Teflon is applied to the inner diameter surface of the inner circumferential bent portion 18a. Coating or plating with nickel is also effective.

When the diaphragm actuator having the above structure is installed in an automobile and the rod 15 is reciprocated by supplying and discharging pressure to drive the link mechanism 14 connected to the tip of the rod 15, the entire actuator is moved as the automobile shakes. It also starts to sway. However, since the bearing 16 is attached to the circumferential surface of the rod 15 at the center of gravity of the actuating member, the lateral vibration of the actuating member (amplitude vibration with the bearing as the fulcrum) is suppressed as much as possible, and unnecessary burden is placed on the diaphragm 3. You don't have to spend it. Furthermore, in general, at the axial position of the rod 15, the center of gravity is closer to the diaphragm 3 than the bearing position of the conventional example (Fig. 3).
Even in normal reciprocating motion, the lateral vibration of the three axes of the diaphragm is reduced, and the load on the diaphragm 3 can be reduced accordingly.

[Effect of idea]

As explained above, the diaphragm actuator of the present invention has a bearing placed at a position that most effectively suppresses the horizontal vibration of actuating members such as the diaphragm and rod, thereby avoiding unnecessary deformation of the diaphragm made of a flexible material. This eliminates movement, extends the life of the diaphragm, and improves its durability.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a diaphragm actuator according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the same essential part, and FIG. 3 is a sectional view of a diaphragm actuator according to a conventional example. 1... Cup, 2... Joint, 3... Diaphragm, 4... Pressure chamber, 5... Second chamber, 6...
Diaphragm support, 7... Spring support, 8, 15... Rod, 9... Shaft hole, 10, 1
6...Bearing, 11, 18...Bearing support, 11a, 18a...Inner periphery bent portion, 12,
17...O ring, 13...Coil spring,
14...Link mechanism.

Claims (1)

[Scope of utility model registration request] A diaphragm is disposed inside the cup to partition the inner chamber of the cup into a pressure chamber connected to the joint and a second chamber, and the diaphragm is elastically biased in a direction to reduce the volume of the pressure chamber. In a diaphragm actuator in which a rod with one end fixed to the diaphragm is inserted into the opened shaft hole so as to be able to reciprocate, a bearing is provided on the circumferential surface of the rod at the center of gravity of the actuating member such as the rod or the diaphragm. A diaphragm actuator, which is attached to the diaphragm actuator, and includes a bearing support disposed concentrically in the shaft hole and extending in the axial direction to guide reciprocating movement of the bearing.