JPH0650642Y2 - Actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an actuator used for opening and closing a waste gate valve of a turbo, for example, and particularly to an actuator capable of improving durability. is there.

[Prior art]

Generally, in this type of actuator, as shown in FIG. 4, the diaphragm chamber 22 of the actuator body 21 is
The diaphragm 23 is used in the partition member that changes the pressure applied to the rod to the movement of the rod 25.

That is, the diaphragm 23 is sandwiched between two retainers 26 at the upper and lower portions of its central portion, and the rod 25 is connected to the central portion thereof by caulking screws 24.

The diaphragm 23 is constantly urged upward by a spring 27 via a retainer 26. Therefore, when the pressure applied to the diaphragm chamber 22 of the actuator body 21 is removed, the rod 25 connected to the diaphragm 23 is
When the pressure is applied to the diaphragm chamber 22, the rod 25 resists the biasing force of the spring 27 and moves downwards.

A turbo wastegate valve (not shown) is opened and closed by the vertical reciprocating movement of the rod 25.

[Problems to be solved by the invention]

However, the diaphragm 23, which is the partitioning material used for this, has excellent followability to the movement of the rod 25, but has a problem of poor durability due to bending fatigue.

That is, the central portion of the diaphragm 23 has two retainers 26.
, And the outer circumference of the diaphragm 23 is
It is held at the joint portion of the upper and lower cases 21a and 21b constituting the.

Therefore, as the rod 25 moves up and down, the diaphragm 23 moves along the outer peripheral edge of the retainer 26 and the upper and lower cases 21a, 21b.
The inner portion held by is repeatedly bent.

When the frequency of this bending increases, the diaphragm is damaged due to bending fatigue. As a result, air leakage occurs and the airtightness inside the diaphragm chamber 22 deteriorates, resulting in an increase in turbo boost pressure and the risk of engine damage due to increased engine speed. There is.

Therefore, the present invention has a holding member formed by an annular elastic body having an outer periphery fixed to the inner periphery of the main body and a sandwiching portion provided on the inner periphery, and a pressure response plate which is a flexible circular metal plate. The partition member is configured with and the pressure response plate is sandwiched by the sandwiching portion of the holding member so as to be slidable in the radial direction, thereby increasing the radius of curvature at the time of bending, preventing the occurrence of bending fatigue, and It is an object of the present invention to provide an actuator having improved durability.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a main body with a partition member that divides the inside into two chambers and is displaceable in a state of resisting a biasing member. An actuator configured to connect rods extending from the main body, move the partition member against the biasing member in response to a pressure applied to the main body, and thereby move the rods, The partition member has an annular shape, an outer peripheral edge is fixed to the main body, a holding member formed of an elastic body having a sandwiching portion on the inner peripheral edge, and a flexible metal plate. A pressure responsive plate slidably held in a state of being sandwiched by the holding portion of the holding member, wherein the holding member and the pressure responsive plate are
Each has a configuration in which it can be displaced.

[Action]

With the above configuration, when pressure is applied to the inside of the main body, the pressure responsive plate bends at the center and moves together with the rod, and the holding member follows the curve as the pressure responsive plate bends. However, the holding portion of the pressure responsive plate of the holding member slides with the movement of the pressure responsive plate to increase the radius of curvature, so that the durability of the partition member can be improved.

〔Example〕

 Hereinafter, embodiments of the invention will be described with reference to the drawings.

1 and 2 show an embodiment of the actuator according to the present invention.

The main body 1 fixed on the base B is composed of an upper case 1a and a lower case 1b each having a pressure supply hole 1c formed in an upper part thereof, and the upper case 1a and the lower case 1b are formed of a rubber-like elastic material and have a bag-shaped cross section. The outer peripheral edge of the holding member 2 is clamped and crimped.

The holding member 2 has an annular shape and has a hollow portion having a bag-shaped cross section on the inner circumference.
A slit 2b communicating with 2a is formed. This slit
An outer periphery of a pressure responsive plate 3 formed of a thin metal plate having flexibility (for example, made of stainless steel) is slidably and closely fitted in 2b.

Therefore, the inside of the main body 1 is partitioned by the holding member 2 and the pressure responsive plate 3 which form the partition material A, and is divided into an upper chamber 4 and a lower chamber 5. The tip of the rod 6 is caulked and fixed to the center of the pressure responsive plate 3.

Further, an urging member (spring) 7 is interposed between the bottom of the lower chamber 5 and the pressure responsive plate 3 to urge the pressure responsive plate 3 upward.

Next, the operation of this embodiment will be described.

FIG. 1 shows the actuator in a normal pressure state, and FIG. 2 shows the actuator in a pressurized state.

When a positive pressure is applied from the pressure supply hole 1c of the main body 1, as shown in FIG. 2, the pressure responsive plate 3, which is one of the members constituting the partition member against the biasing force of the spring 7, is gradually increased. While being elastically deformed and curved, the rod 6 descends together with the rod 6, and as the pressure responsive plate 3 descends, the holding member 2 which is an elastic body is also curved and deformed.

At this time, the holding portion between the holding member 2 and the pressure responsive plate 3 is slidable, and slides as the pressure responsive plate 3 moves. Therefore, even if the pressure responsive plate 3 moves up and down, undue tension is not generated between the members.

Furthermore, each member elastically deforms with the application of pressure,
The bending radius is large, so bending fatigue is eliminated.

Next, when the pressure applied to the upper chamber 4 is removed to bring it to a normal pressure state, the circular pressure responsive plate 3 and the annular holding member 2 that holds the circular pressure responsive plate 3 are moved by the urging force of the spring 7 and their own restoring force. 1
It will be horizontal as shown in the figure.

FIG. 3 shows another embodiment of the present invention. In the figure, the same parts as those of the above embodiment are designated by the same reference numerals.

In the above embodiment, the main body 1 was divided into the upper case 1a and the lower case 1b, but in this embodiment, the main body is integrally formed.

That is, in the above embodiment, the stepped portion 1d is formed on the inner periphery of the main body 1 corresponding to the upper case, and the lower portion is opened to form the flange 1f on the outer peripheral edge.

Therefore, the holding member 2 can be inserted from the open portion 1e at the lower portion of the main body, and the lower outer peripheral edge of the holding member 2 abutted on the stepped portion 1d is supported by the annular member 8 and fixed to the main body 1 by the retaining ring 9. It

As a result, the main body 1 is integrally molded, so that there is an advantage that the caulking process is not required, the manufacturing is easy, the assembling of the holding member 2 is simple, and the replacement work can be easily performed.

The holding member 2 whose outer peripheral edge is thus held and the pressure responsive plate 3 which is slidably sandwiched between the inner peripheral edge of the holding member 2.
Since the partition member A is constituted by and, since the radius of curvature due to bending is large when each member is deformed when pressure is applied, fatigue is improved without fatigue even when the number of repetitions increases. .

[Effect of device]

As described above, according to this invention, since the holding portion of the pressure responsive plate is formed on the inner peripheral edge of the annular holding member, the holding portion that holds the pressure responsive plate is in close contact with the airtightness. In addition to improving the strength of the holding member, the holding member and the pressure responsive plate can slide at the clamping part even when pressure is applied, so there is no undue tension or deformation, and the curvature of each member due to bending Since the radius is large, the durability can be improved even if the rod is reciprocated frequently. Moreover,
In this case, when the pressure is applied, the pressure responsive plate and the holding member can be respectively displaced, so that a large displacement amount of the partition member can be secured. Therefore, there is an excellent effect that the stroke control according to the magnitude of the applied pressure can be performed without reducing the stroke amount of the rod.

[Brief description of drawings]

FIG. 1 is a sectional view of an actuator showing a normal pressure state in an embodiment of the present invention, FIG. 2 is a sectional view of the actuator showing a state where pressure is applied to the one shown in FIG. 1, and FIG. FIG. 4 is a sectional view of an actuator of an example, and FIG. 4 is a sectional view of an actuator of a conventional example. A: Partition material B: Base 1, 21 ... Main body 1a, 21a ... Upper case 1b, 21b ... Lower case 1c ... Pressure supply hole 1d ... Stepped part 1e ... Open part 1f ... Flange 2 …… Holding member 2a …… Cavity 2b …… Slit 3 …… Pressure response plate 4 …… Upper chamber 5 …… Lower chamber 6,25 …… Rod 7,27 …… Spring 8 …… Ring member 9 …… Retaining ring 22 …… Diaphragm chamber 23 …… Diaphragm 24 …… Caulking screw 26 …… Retainer

Claims (1)

[Scope of utility model registration request] 1. A main body (1) is provided with a partition member (A) which divides the interior into two chambers and is displaceable in a state of resisting a biasing member (7). A) is connected to a rod (6) extending from the main body (1), and the partition member (A) resists the biasing member (7) according to the pressure applied to the main body (1). The partition member (A) has an annular shape and has an outer peripheral edge fixed to the main body (1) and an inner peripheral edge. A holding member (2) formed of an elastic body having a holding portion and a flexible metal plate, and sliding while the outer peripheral edge portion is held by the holding portion of the holding member (2). And a pressure responsive plate (3) that is movably held, and the holding member (2) and the pressure responsive plate (3) The actuator being characterized in that become possible respectively displaced.