JPS6192305A - Bellows type actuator - Google Patents

Abstract

PURPOSE:To improve productivity of the captioned actuator as well as to make the stroke thereof adjustable by opening one end of the bellows body of the actuator and sealing this opening by means of a lid board. CONSTITUTION:One end of the bellows body 2 of an actuator 1 is opened and a flare pat 10 through which a small hole is drilled is fitted in the opening and this small hole is tightly sealed with a lid board 9. Owing to the above arrangement, the stroke of the actuator 1 can be freely adjusted because the bellows body can be cut away before the lid board 9 is attached. In addition, the mold of the actuator need not be prepared for every stroke, thus the productibity thereof being enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a bellows-type actuator used, for example, as an actuator for driving a door of an air conditioner for an automobile.

[Background of the invention]

Conventionally, this type of actuator was developed in U.S. Patent Publication No. 57-19916.
As shown in the above-mentioned No. 1, it is known that an expandable bellows body portion, a lid plate and a bottom plate portion that close both ends of the bellows body portion are integrally formed by blow molding.

However, this conventional actuator has a fixed expansion/contraction dimension, can only obtain a limited stroke, and has the problem that a separate mold must be prepared for each actuator with a different stroke.

[Purpose of the invention]

An object of the present invention is to provide a bellows type actuator whose stroke can be freely adjusted and which is highly productive.

[Summary of the invention]

In order to achieve the above object, the present invention has an advantage in that the bellows body of the actuator is formed so that at least one end thereof is open, and this opening is sealed with a cover plate. By making the body removable, the stroke of the actuator can be freely adjusted, and there is no need to prepare a separate actuator type for each stroke.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below based on the drawings.

The actuator 1 has an expandable bellows body 2 having a wave-shaped cross section. A bottom wall portion 4 having a hole for locking a rod A of an operated device is integrally formed at one end of the bellows body 2. A bellows body with this shape is made by blow-molding gono-meru or a similar resin material.
Therefore, it is formed. The other end of bellows body 2 is open)
, is provided with a flared portion 10 extending inwardly therein. The flared portion 10 can also be formed by cutting a portion of the bellows of the body 2 at the valley portion of the wavy portion.

Small holes are bored in this flared portion 10 at appropriate intervals.

This opening is sealed with a cover plate 9 formed separately from a resin or metal plate.

For sealing, this flare part 10 is placed between the annular plate (resin or metal) 7 that contacts the flare part 10 from the inside of the body and the lid plate 9 that contacts the flare part 10 from the outside.
Glue. These joints may be bonded with an adhesive, but as shown in the figure, a protrusion 8t is integrally formed on the annular plate 7, and the protrusion 8t is passed through a small hole in the flare part 10 and inserted into a hole provided in the cover plate 9. Penetrate it and crush its tip (
If it is resin, weld it) to join the king.

A nipple 5 for introducing pressure fluid is integrally formed on the cover plate 9.

When the lid plate 10 side is fixed to the device and negative pressure is applied from the nipple 5, the bellows body 2 overcomes the elastic force of the bellows and contracts. As a result, rod A is pulled and the operated device is operated to a desired state.

Next, when atmospheric pressure is applied from the nipple 5, the elastic force of the bellows causes the bellows to expand and restore its original shape. This causes rod A to be operated in a direction opposite to the previous direction, operating the controlled device into a different state.

FIG. 2 shows another embodiment. In this embodiment, a cover plate 9 is integrally formed with one end of the bellows body 2. The opening side end is joined and sealed by separately molded bottom plate part 4 and disc 3, sandwiching flare part 10 in the same manner as in the embodiment shown in FIG.

FIG. 3 shows another embodiment. In this embodiment, both ends of the bellows body 2 are open. The lid plate 9 and the bottom plate 4 are both formed as separate members, and the openings at both ends are closed by the method shown in FIGS. 1 and 2, respectively.

Next, a multistage actuator based on the basic configuration of the actuator described above will be explained.

The multistage actuator 11 shown in FIG. 4 has an extension dimension of the weightable part of the bellows 2 of the actuator 1 shown in FIG.
, e2, two different actuators 1 and 1' are connected by a connecting disk 3 and a connecting bottom plate 4. That is, the connecting disk 3 and the connecting bottom plate 4 of each actuator.
The flare portions 10.degree. and 10' of each actuator are sandwiched between the members and locked by the projections 8 in the same manner as shown in FIG. The actuator 11 configured in this way has two
Since two independent negative pressure chambers are formed during expansion, when negative pressure is supplied to the nipple 5.5' connected to an external negative pressure source, it can expand and contract independently or in conjunction with each other as a multi-stage actuator. do.

That is, if the nipple 5 side is fixed to the device and negative pressure is first applied to the nipple 5 side, the actuator 1
' contracts and strokes by tz. Next, when negative pressure is applied to the nipple 5 side, the actuator 1 contracts and further strokes by tl. Thus, the actuator as a whole: 1. Stroke by +12.

FIG. 5 shows another embodiment of the two-stage actuator. In this embodiment, the bottom plate 4 of two actuators 1, 1' is formed by integrally molding the bellows body 2 (2') and the bottom plate 4 (4').
, 4' are joined with a reinforcing plate 51 in between. For joining, one of the peaks of the bellows of the actuators 1, 1' is held together with the mating plate 51 at several locations using clips 50 and fixed. Alternatively, it may be bonded with an adhesive. The open end of the actuator 1 is a cover plate 9 having a nipple 5 and a first. It is sealed in the same manner as the embodiment shown in FIG. The open end of the actuator 1' is similarly sealed with a cover plate 9' having a nipple 5', but the cover plate 9'IC is integrally formed with an arm having a small hole for engaging the operating rod of the controlled device. ing. The action is the fourth
Since it is the same as the two-stage actuator 11 shown in the figure, the explanation will be omitted.

FIG. 6 shows yet another embodiment of the two-stage actuator.

In this embodiment, two actuators constituting the double actuator 11 are
The nipples of the two actuators are installed together on the cover plate of one actuator, making it easier to route the negative pressure piping.

A nipple 19 is located in the center of the cover plate 9 of one actuator 1.
A nipple 18 is integrally formed at one location offset from the center.

A nipple 16 is integrally formed in the center of the reinforcing plate 12 that joins the two actuators 1 and 1', and each actuator 1 is connected between the reinforcing plate 12 and the annular plate 7'.
．． The two actuators 1 and 1' are joined by sandwiching the flare portions 10° and 10' of the actuators 1' and fixing them together.

Before joining the reinforcing plate 12, the nipples 18 and 16 are connected with a rubber hose 21. This allows nipple 18
The negative pressure applied to the actuator 1 passes through the actuator 1 and is supplied to the actuator 1'. The operation of the actuator is the same as that of the double actuator described above, but when the actuator 1 contracts, the rubber hose 21 deforms in a coiled manner in the space 14 inside the body 2, and may collapse its own passage or cause the actuator 1 to contract. It has been devised to prevent this from happening. This is because the nipples 16 and 18 are arranged offset so that they are not arranged on the same axis,
This is also because the cover plate 9 and the reinforcing plate 12 are formed into a bowl shape and are arranged facing each other to secure a contraction space for the hose 21 when the actuator 1 contracts.

FIG. 7 shows a four-stage actuator constructed by combining two of the two-stage actuators described above.

Two two-stage actuators 11 and lla are prepared in which the bottom plate of the actuator 1' is integrally formed with the body 2' and flat, and these two two-stage actuators 11. The full reinforcing plate 51 of the bottom plate of lla is sandwiched and fixed using clips 6o in the same manner as in the method shown in FIG.

By sequentially applying negative pressure to the nipples 18, 19, 18a, and 19a, the stroke can be adjusted in four stages depending on the amount of contraction of each actuator.

FIG. 8 shows an example in which the two-stage actuator according to the present invention is used for operating an inside/outside air switching door of an inside/outside air introduction device of an air conditioner for an automobile.

The inside/outside air introduction device is composed of a blower 23 and a blower case 24 that houses the blower 23. The blower case 24 is divided into an upper case 25 and a lower case 26 to form a spiral case. The upper case 26 has an internal air introduction port 2.
7. An inside/outside air switching box 29 having an outside air inlet 28 is provided and can be selectively opened and closed by an inside/outside air switching door 30. The opening link 32 is held on the shaft 31 of the internal/external air switching door, and the opening link 32 is connected to the connecting rod 33 as described above. A two-stage actuator 11 is connected. The embodiment shown in FIG. 8 shows a state in which the double actuator 11 is extended, and at this time, the door 30
is in an inside air introduction state with the outside air introduction port 28 closed. Firstly, the first actuator 1 of the two-stage actuator 11
When the door 30 operates, the outside air inlet 28 and the inside air inlet 2
When the second actuator 1' is further operated, the outside air introduction state is reached in which the inside air introduction port is completely closed.

The most important point in each of the embodiments described above is that the bellows body constituting the actuator has an opening at at least one end. With this configuration, the stroke can be freely selected during use by cutting out some of the wavy portions on the opening side.

After adjusting the stroke in this manner, the actuator is constructed by joining and sealing the lid plate or the bottom plate to the remaining flared portion as described above.

〔Effect of the invention〕

As described above, according to the present invention, the stroke of the bellows type actuator can be freely adjusted during use, and actuators with different strokes can be obtained with the same type, which is not only easy to use but also highly productive. The actuator was obtained.

[Brief explanation of the drawing]

Figures 1 to 7 show embodiments of the actuator according to the present invention, Figures 1 to 3 show three types of embodiments of a single actuator, and Figures 4 to 6 p2q, actuator 7 shows an example of a 4-stage actuator, and FIG. 8 shows an example of a 4-stage actuator according to the present invention. Fig. 6 is a drawing showing an example used for this purpose. 1.1'... Actuator, 2.2'... Bellows body, 4... Bottom plate, 5... Nipple, 7, 7'...
- Annular plate, 8... Protrusion, 10.10'... Flare part, 11°11'... Two-stage actuator, 16.
...Nipple, 21...Elastic body hose, -23...
Prower, 24... Prower case, 25... Upper case, 26... Lower case, 27... Inside air inlet, 2
8... Outside air inlet, 29... Inside/outside air switching box, 30.
・・Inside/outside air switching door, 31...shaft, 32...link, 33...connecting rod, 50.60...crisp.

Claims (9)

[Claims] 1. a bellows-shaped body with at least one end open;
a lid plate that closes an open end of the body and substantially seals the inside of the body; a negative pressure/atmospheric pressure supply means for selectively supplying either negative pressure or atmospheric pressure into the sealed body; and the body. A bellows-type actuator comprising a transmission member that transmits axial displacement based on axial deformation of the body to a driven part in a state in which negative pressure is supplied and in a state in which atmospheric pressure is supplied. . 2. The bellows type actuator according to claim 1, wherein the cover plate is provided with a nipple for connecting an atmospheric pressure/negative pressure introduction pipe as the atmospheric pressure/negative pressure supply means. 3. In claim 1, a nipple for connecting an atmospheric pressure/negative pressure introduction pipe serving as the atmospheric pressure/negative pressure supply means is formed on a wall surface of the side facing the cover plate and integrally formed with the body. A bellows type actuator characterized by: 4. a plurality of bellows-shaped bodies with at least one open end; a lid plate that closes the open ends of the bodies and substantially seals the inside of each body; and the plurality of closed bodies are connected in series in the axial direction. connection means, atmospheric pressure for selectively supplying atmospheric pressure or negative pressure into each of the bodies, negative pressure supply means, and whether atmospheric pressure or negative pressure is supplied into each of the bodies. A bellows-type actuator comprising a transmission member that transmits axial displacement based on axial deformation of the body to a driven part. 5. Claim 4 is characterized in that the body consists of two bodies with openings at both ends, and that at least one of the lid plates is provided with an intermediate lid plate that simultaneously closes the facing openings of each adjacent body. A bellows type actuator. 6. The bellows according to claim 5, wherein the atmospheric pressure/negative pressure supply means includes a nipple for connecting an atmospheric pressure/negative pressure introduction pipe formed on each cover plate facing the intermediate cover plate. type actuator. 7. In claim 5, the atmospheric pressure/negative pressure supply means is formed on one of the lid plates facing the intermediate lid plate, and supplies atmospheric pressure to the interior space of the body facing the lid plate. - A first nipple for connecting a pipe for introducing negative pressure, a second nipple for connecting a pipe for introducing atmospheric pressure/negative pressure formed on the lid plate where the first nipple is formed, and a second nipple for connecting the pipe for introducing negative pressure, formed on the intermediate lid plate. a third nipple that selectively introduces either atmospheric pressure or negative pressure into a second body interior space formed on the opposite side of the first body interior space across the intermediate lid plate; A bellows-type actuator comprising a pipe connecting the second nipple and the third nipple by crossing the inner space of the first body. 8. Claim 4 is characterized in that the body comprises two cup-shaped bodies each having an open end, and the connecting means comprises a fixing means for fixing the closed ends of both bodies in a joined state. A bellows type actuator. 9. In claim 8, the atmospheric pressure/negative pressure supply means is formed on the lid plate facing each of the closed ends, and introduces atmospheric pressure/negative pressure into the respective body internal spaces facing each lid plate. A bellows-type actuator characterized by including a nipple for connecting a pipe.