JP2546353Y2 - Diaphragm type actuator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm type actuator, and particularly to an internal combustion engine equipped with a turbocharger.
The present invention relates to a diaphragm-type actuator suitable for a wastegate actuator that controls opening and closing of an exhaust valve for turbo switching.

[0002]

2. Description of the Related Art As shown in FIG. 6, for example, a conventional wastegate actuator includes a lower cover 2 fixed to a bracket 1, an upper cover 3 in which the lower cover 2 is caulked to an outer peripheral flange, and an outer peripheral edge formed by a lower cover 2 as shown in FIG. And a diaphragm 4 sandwiched between the flanges of the upper cover 3 and
An upper shell 5 and a lower shell 6 for holding the diaphragm from the right and left sides, one end of which is fixed to the center of the diaphragm, and the other end of which is a lower cover 2 and a bracket 1.
, A filter 9 for preventing dust from entering an atmosphere chamber 8 provided in a portion of the lower cover 2 penetrating the operation rod, a retainer 10 for stopping the filter 9, and a retainer 10 And lower shell 6
And a spring 12 for urging the diaphragm 4 toward the pressure chamber 11.

[0003] 2a is a breathing hole formed in the lower cover 2 for introducing the atmosphere into the atmosphere chamber 8, 13 is a washer fitted to one end of an operating rod, and 14 is a tube attached to the upper cover 3 for introducing pressure. It is. (For example, Japanese Unexamined Utility Model Publication No. 1-173502).

As shown in FIG. 7, the wastegate actuator 15 having such a structure is connected to a movable end of a wastegate link 17 having one end fixed to one end of a valve shaft 16 of a wastegate valve by a pin 18. . 19 is an E-shaped retaining ring.

[0005]

[Problems to be Solved by the Invention] In the above conventional technology,
Foreign matter such as oil or sand entering the atmosphere chamber 8 from the breathing hole 2a of the lower cover 2 directly adheres to the diaphragm 4 and wears the diaphragm, so that there is a problem that durability is reduced.

Therefore, an object of the present invention is to provide a diaphragm type actuator which can solve such a problem.

[0007]

In order to achieve the above object, a diaphragm type actuator according to the present invention has a diaphragm (4) in a diaphragm type actuator having a breathing hole (2a) for introducing the atmosphere into an atmosphere chamber (8). )
A spring retainer (10) for receiving one end of a spring (12) for urging the spring is disposed between the breathing hole (2a) and the diaphragm (4).
0) , the outlet (10b) at both ends by press floating
(10b) Tunnel-shaped floating wall with an opening at the bottom
(10a) is formed as a bump, and the air chamber is formed through the breathing hole (2a).
Atmosphere passes through the air passage leading to (8) through the floating wall (10).
The fact that it was formed on a curved path that diverted by colliding with the back side of a)
Features .

[0008]

[Action] bent Michika been air passage, the air bottom inlet including a foreign matter oil or sand or the like entering from the breathing hole (2a)
And once collides with the back surface of the floating wall (10a),
Deflected and exited from both exits (10b) (10b) to atmosphere chamber
(8). At this time, most of the foreign substances such as oil
It may adhere to the surface of the floating wall due to collision with the
Or it falls to the atmosphere side by rebound. So oil and
Foreign substances such as sand are prevented from directly adhering to the diaphragm (4) .

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of FIGS.
Is fixed to the bracket 1 with a lower cover. 2a
Is a breathing hole formed in the lower cover 2, and 2 b is a bottom plate whose outer peripheral edge is welded to the lower cover 2.

Reference numeral 3 denotes an upper cover to which the lower cover 2 is crimped on an outer peripheral flange. Reference numeral 4 denotes a diaphragm whose outer peripheral edge is clamped between the flanges of the lower cover 2 and the upper cover 3. An upper shell 5 and a lower shell 6 for clamping the diaphragm 4 from the right and left sides are provided. The upper end of the rod 7 is fixed to the center of the diaphragm 4.

Reference numeral 8 denotes an atmosphere chamber formed between the lower cover 2 and the diaphragm 4, 9A denotes a bush, 10 denotes a spring retainer, 11 denotes a pressure chamber formed between the upper cover 3 and the diaphragm 4, and 12 denotes a diaphragm. A spring biasing the pressure chamber 11 side, 13 is a washer fitted to the right end of the operating rod, and 14 is a tube attached to the upper cover 3 for introducing pressure.

The spring retainer 10 has a substantially dish shape as a whole, and is disposed so as to face the inside of the breathing hole 2 a of the lower cover 2. Reference numeral 10a denotes a floating wall formed in the spring retainer 10, which is provided at four places where the circumference is divided into four equal parts, and the air from the breathing hole 2a passes through the air passage 15 and floats.
It flows into the air chamber 8 from Dekabe 10a of exit 10b as indicated by arrow A.

The air passage 15 is provided with the breathing hole 2 of the lower cover 2.
opening out from a of 浮出wall 10a of the spring retainer 10 1
In this way, a foreign material is prevented from directly invading and adhering from the breathing hole 2a to the diaphragm 4 of the atmosphere chamber 8 by being formed in a bent path until 0b.

The positional relationship between the breathing hole 2a and the floating wall 10a on the side view may or may not be the same as shown in FIG. In addition, it is possible to remove water from the breathing hole 2a without any problem.

[0015]

[Effect of the Invention] The diaphragm type actuator of the present invention is configured as described above, and foreign matter such as oil floats.
Large because it adheres to the back wall surface of the wall or falls to the atmosphere side
Does not enter the air chamber (8). Also, the back wall of the raised wall and the breathing hole
Even if the position of (2a) matches, the path of the atmosphere is a curved path
Since it is formed at a position, foreign matter is prevented from entering.

As a result, there is little harm to the diaphragm due to foreign matter, the durability is improved, and the life of the diaphragm is prolonged.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

2A is an enlarged view of a main part of FIG. 1, and FIG.
AA line sectional drawing.

FIG. 3 is a P view of FIG. 2;

FIG. 4 is a partially cutaway perspective view of a spring retainer in the embodiment of FIG. 1;

FIG. 5 is a side view of the spring retainer in the embodiment of FIG.

FIG. 6 is a sectional view of a conventional technique.

FIG. 7 is a partial cross-sectional view showing a state where a conventional actuator is connected to a valve shaft of a waste gate valve.

[Explanation of symbols]

2 Lower cover 2a Breathing hole 4 Diaphragm 8 Atmospheric chamber 10 Floating wall 12 Spring 15 Atmospheric passage

Claims (1)

(57) [Scope of request for utility model registration] A spring (12) for urging a diaphragm (4) in a diaphragm type actuator having a breathing hole (2a) for introducing air into an atmosphere chamber (8).
A spring retainer (10) that receives one end of the spring retainer (10) is disposed between the breathing hole (2a) and the diaphragm (4), and the spring retainer (10) is press-embossed.
Exits (10b) and (10b) at both ends and entrances at the bottom
The raised tunnel-shaped floating wall (10a) is raised to form a breathing hole.
The atmosphere passes through the atmosphere passage leading from (2a) to the atmosphere chamber (8).
Bent path that deflects by colliding with the back surface of the floating wall (10a)
A diaphragm type actuator characterized by being formed in: