JP3465737B2 - Diaphragm 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 actuator which is a kind of fluid pressure actuator,
In particular, the present invention relates to a diaphragm actuator suitable for being installed near an engine or an apparatus that generates high heat during operation, such as a vehicle engine or an exhaust gas system.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
1, the pressure is introduced to displace the diaphragm 52, whereby the rod 5 connected to the diaphragm 52 is displaced.
Diaphragm actuators that operate 3 are known.

The rod 53 has one end 53a connected to the diaphragm 52 and the other end 53b connected to the cup 5.
1, a bearing 54 that slidably supports the rod 53 and a bearing retainer 55 that supports the bearing 54 are provided on the periphery of the shaft hole 51a of the cup 51. A bracket 56 for fixing the diaphragm actuator at a predetermined position is fixed to the outer surface of the cup 51 on the upper and lower sides in the drawing.

In the diaphragm actuator having the above structure, the bearing 54 is molded of resin because it has excellent sliding characteristics and vibration damping characteristics.
The resin bearing 54 has a disadvantage that it is thermally deformed or deteriorated at an early stage when it becomes hot.

In the diaphragm actuator having the above structure, the resin bearing 54 is housed inside the cup 51 together with the bearing retainer 55, and the bracket 56 is fixed to the lower side of the cup 51. Since the bearing 54 is distant from the outside air, the bearing 54 has a structure that is hard to be cooled by the outside air.

Therefore, when the diaphragm actuator having the above structure is installed near an engine or an exhaust gas system or the like which emits high heat during operation, the diaphragm actuator is exposed to high heat and becomes high in temperature. As a result, the temperature of the bearing 54 becomes high, and once the temperature of the bearing 54 becomes high, the heat is not easily released, so that the bearing 54 is thermally deformed or deteriorated at an early stage.

[0007]

SUMMARY OF THE INVENTION In view of the above points, the present invention is a component of a diaphragm actuator installed near an engine or device that emits high heat during operation, such as an engine or an exhaust gas system of a vehicle. (EN) Provided is a diaphragm actuator which has a structure in which the bearing is easily cooled by the outside air, which can suppress the early thermal deformation or thermal deterioration of the bearing and can also exhibit excellent heat resistance. To aim.

[0008]

In order to achieve the above object, a diaphragm actuator according to claim 1 of the present invention is provided with a shaft hole and a cup having a diaphragm installed therein, and is fixed to the periphery of the shaft hole of the cup. A bearing retainer, a bearing supported by the bearing retainer, and a rod slidably supported by the bearing and having one end connected to the diaphragm, the bearing being on the outer peripheral side of the bearing. An annular recess opened to the outside of the cup is provided between the retainer and the cup, and is fixed to the outer surface of the cup.
Has a fixed bracket, and
Is provided with a communication passage for communicating the outer portion of the cup with the outside of the cup.
The bearing has a meat stealing part and a relatively large surface area.
It is characterized by that.

In addition to this, the diaphragm actuator according to claim 2 of the present invention is the diaphragm actuator according to claim 1 described above , wherein
On the peripheral surface, the required number of convex parts are arranged in a uniform pattern inward in the radial direction.
It is characterized by being provided.

As in the diaphragm actuator according to claim 1 of the present invention having the above-mentioned structure, between the bearing retainer supporting the bearing on the outer peripheral side of the bearing and the cup fixing the bearing retainer, the cup When the annular recess that is open to the outside is provided, the outside air is introduced into the recess at any time. Therefore, it is possible to cool the bearing at any time by the outside air introduced into the recess, and thus it is possible to prevent the bearing from being thermally deformed or thermally deteriorated at an early stage. The recessed part dents the axial hole peripheral part of the cup inward,
It is preferably formed by combining a bearing retainer here.

In addition to this, as in the diaphragm actuator according to claim 1 of the present invention having the above-mentioned structure, the bracket fixed to the outer surface of the cup is provided with the communication passage for communicating the concave portion with the outside of the cup. If it is
Even if the bracket is fixed to the cup, the recess is not closed by the bracket, and the outside air is still introduced into the recess through the communication passage. Therefore, even if the diaphragm actuator has a bracket, it is possible to cool the bearing at any time by the outside air introduced into the recess through the communication passage, which prevents the bearing from being thermally deformed or deteriorated quickly. It becomes possible to suppress. The communicating passage is preferably formed by enlarging the inner diameter of the rod penetrating portion of the bracket. In addition, the die with the above configuration
In Afram actuators, bearings are stolen
It has a relatively large surface area and has heat
Is easy to diverge. A diaphragm according to claim 2 of the present invention
On the ram actuator,
The required number of protrusions are provided in an even distribution inward in the radial direction.
The bracket to prevent the bearing retainer or
Easy to position in the radial direction.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

First Embodiment ... FIG. 1 is a front view of a diaphragm actuator according to this embodiment, FIG. 2 is a plan view of the same, FIG. 3 is a bottom view, FIG. 4 is a left side view, and FIG. 5 is an internal structure. Explanatory drawing and FIG. 6 are enlarged views of the main parts of FIG.

As shown in FIG. 5, a diaphragm 4 is installed inside the cup 1, and one end 5a of a rod 5 is connected to the diaphragm 4.

The cup 1 has a vent hole 2b at the center of the top surface 2a.
And a metal lower cup 3 in which a shaft hole 3b is provided in the center of the bottom surface 3a and a cylindrical joint 6 is connected to one location on the circumference of the peripheral surface 3c. , The latter lower cup 3 has its outer peripheral edge portion 3d
The outer peripheral edge portion 2c of the upper cup 2 and the outer peripheral edge portion 4a of the diaphragm 4 are airtightly caulked and fixed over the entire circumference. The inside of the cup 1 is partitioned by a diaphragm 4 into an atmosphere chamber 7 on the upper side of the figure and a pressure chamber 8 on the upper and lower sides of the figure.

The diaphragm 4 is formed of a rubber-like elastic material into a film shape, and a diaphragm retainer 9, a washer 10, a spring retainer 11 and a washer 12 made of metal are laminated on the central portion 4b, and the central portion of the laminated portion. One end 5a of the rod 5 is connected to. In order to improve the heat resistance, it is desirable to use hydrin rubber with a base cloth as the material of the diaphragm 4. The other end 5b of the rod 5 projects outside the cup 1, and the other end 5b is provided with a male screw for connection. A coil-shaped spring 13 is provided inside the pressure chamber 8 and between the bottom surface 3 a of the lower cup 3 and the washer 12.

As shown in the enlarged view of FIG. 6, the lower cup 3
An annular metal-made bearing retainer 14 is fitted on the peripheral edge of the shaft hole 3b, and a bearing 15 for slidably supporting the rod 5 and an outer periphery of the rod 5 are provided on the inner peripheral side of the bearing retainer 14. A rod seal 16 that seals the outer circumference of the rod 5 is provided in close contact with the surface, and further, between the bearing retainer 14 and the lower cup 3 on the outer peripheral side of the bearing 5, an annular ring opened to the outside of the cup 1 is provided. A recess (also referred to as an outside air introduction space) 17 is provided.

The lower cup 3 is integrally provided with a cylindrical portion 3e at the inner peripheral end of the bottom surface 3a toward the inside of the cup 1 (upper side in the drawing), and the inner end of the cylindrical portion 3e has an annular shape. The flange portion 3f is integrally provided radially inward, and the shaft hole 3b is provided at the inner peripheral edge portion of the flange portion 3f.

The bearing retainer 14 includes the lower cup 3
Small-diameter cylindrical portion 14 fitted to the inner peripheral side of the flange portion 3f of
a, and at the inner end of the small-diameter tubular portion 14a,
An annular inner flange portion 14b, which is overlapped with the flange portion 3f of the lower cup 3 from the inside of the cup 1, is integrally provided toward the outer side in the radial direction.
A large-diameter cylindrical portion 14c is integrally provided on the outer peripheral edge of the cup 1 toward the inside of the cup 1. Further, an annular outer flange portion 14d for preventing the bearing 15 from coming off is integrally provided at an outer end portion of the small diameter cylindrical portion 14a so as to be directed radially inward.

The bearing 15 is formed of resin in an annular shape and has a shape shown in FIG. In order to improve the heat resistance, it is desirable to use a glass-filled fluororesin or a glass-filled nylon resin as the material of the bearing 15. That is, FIG.
As shown in an enlarged scale, the bearing 15 has a cylindrical inner peripheral surface 15 a that slidably contacts the peripheral surface of the rod 5.
And a spherical outer peripheral surface 15b slidably contacting the inner peripheral surface of the small-diameter cylindrical portion 14a of the bearing retainer 14, and the annular end surface portions 15c and 15d are provided with annular recesses 15e, respectively. This meat stealing part 1 which is formed into a groove shape
Four ribs 15f for reinforcement are integrally formed in the inside of 5e in a uniform pattern.

The rod seal 16 is formed of rubber-like elastic material into an annular shape, and is an annular shape fitted to the inner peripheral side of the large-diameter cylindrical portion 14c so as to come into contact with the inner flange portion 14b of the bearing retainer 14. The mounting portion 16a and an annular bellows portion 16 integrally provided on the inner peripheral side of the mounting portion 16a
b and an annular lip portion 16c integrally provided on the inner peripheral side of the bellows portion 16b.
Inwardly facing lip 1 facing the inside of cup 1 for pressure
6d and an outward facing lip 16e for dust facing the outside of the cup 1 are integrally formed in a bifurcated shape. In order to prevent the rod seal 16 from coming off, the mounting portion 16a
Large-diameter cylindrical portion 1 of the bearing retainer 14 inside the bearing
An annular metal plate 18 is fitted on the inner peripheral side of 4c, and the metal stop ring 1 is laid on top of this.
9 is fitted. In order to improve heat resistance, it is desirable to use H-NBR or the like as the material of the rod seal 16.

On the outer peripheral side of the bearing 15, the concave portion 17 is formed in a groove shape so as to be surrounded on three sides by the small diameter cylindrical portion 14a of the bearing retainer 14, the flange portion 3f and the cylindrical portion 3e of the lower cup 3, The atmosphere is open to the outside of the cup 1, that is, in the vertical direction in the figure. Further, in order to secure a large volume of the concave portion 17, the flange portion 3f of the lower cup 3 has the inner end surface 15a of the bearing 15.
Is disposed more inside the cup 1, and a dimensional difference corresponding to the radial length of the flange portion 3f of the lower cup 3 is provided between the small diameter tubular portion 14a of the bearing retainer 14 and the tubular portion 3e of the lower cup 3. It is set. A part of the outer flange portion 14d and the small-diameter tubular portion 14a of the bearing retainer 14 with respect to the bottom surface 3a of the lower cup 3 has a shape protruding toward the outer side (upper and lower sides in the drawing) of the cup 1.

A metal bracket 20 having a flat plate annular shape is concentrically fixed to the outer surface of the lower cup 3 above and below the bottom surface 3a by rivets or welding.
Two mounting bolts 21 for mounting the diaphragm actuator at a predetermined position are erected on the bracket 20 in an equidistant manner. Also this bracket 2
0 between the inner peripheral surface 20a and the outer peripheral surface of the small diameter tubular portion 14a of the bearing retainer 14
An annular communication passage 22 is provided that connects 7 and the outside of the cup 1.

The diaphragm actuator having the above structure is installed near the engine of the vehicle, for example, with the bracket 20 and the bolt 21, and a pipe is connected to the joint 6 so as to introduce a negative pressure into the pressure chamber 8 and an auxiliary machine is installed. This auxiliary equipment is connected to the other end portion 5b of the rod 5 so as to operate, and when a negative pressure of a predetermined magnitude is introduced into the pressure chamber 8 via the joint 6, the diaphragm 4 is changed to a diaphragm. Spring 13 together with retainer 9, washer 10, spring retainer 11 and washer 12
5 is displaced downward in FIG. 5 against the elasticity of the rod 5, the rod 5 is displaced in the same direction, and this displacement is transmitted to the accessory. Further, when the negative pressure introduced into the pressure chamber 8 is discharged from this state, the diaphragm 4 moves upward in FIG. 6 due to the elasticity of the spring 13 together with the diaphragm retainer 9, the washer 10, the spring retainer 11 and the washer 12. Then, along with this, the rod 5 returns in the same direction, and the displacement in the opposite direction is transmitted to the accessory.

During this operation, since the diaphragm actuator is installed near the engine and exposed to the operating heat of the diaphragm actuator, the entire diaphragm actuator becomes high in temperature.
However, according to the above-mentioned configuration, since the annular recess 17 is provided on the outer peripheral side of the bearing 15 with the bearing retainer 14 separating one metal plate, the recess 17 is always kept at a relatively low temperature. Outside air is introduced. Therefore, the bearing 15 is cooled at any time by the relatively low temperature outside air introduced into the concave portion 17, whereby it is possible to prevent the bearing 15 from being thermally deformed or thermally deteriorated early as in the conventional case.

On the inner surface of the bracket 20, which is fixed to the outer surface of the lower cup 3 and below the bottom surface 3a of the lower cup 3, an annular communication passage 2 for communicating the recess 17 with the outside of the cup 1 is formed.
2 is provided, even if the diaphragm actuator has the bracket 20, the recess 17 is not blocked by the bracket 20, and the recess 17 is always kept at a relatively low temperature via the communication passage 22. Outside air is introduced. Therefore, the bearing 15 is cooled at any time by the relatively low temperature outside air introduced into the concave portion 17 through the communication passage 22, and the bearing 15 is thereby cooled.
It is possible to suppress early thermal deformation or thermal deterioration as in the conventional case.

Further, in the diaphragm actuator having the above structure, the resin bearing 15 itself has the thin-walled portions 15e on both axial end surfaces 15c and 15d, respectively, and is formed into a thin wall having a substantially H-shaped cross section. Since it has a relatively large surface area, it has a shape that easily dissipates heat.

Second Embodiment ... FIGS. 8 and 9 show a diaphragm actuator according to a second embodiment of the present invention. This diaphragm actuator relates to the first embodiment described above in the following points. It has a structure different from that of the diaphragm actuator.

That is, as shown in the bottom view of FIG. 9, a required number (in the figure, inward) of the inner peripheral surface 20a of the metal bracket 20 having a flat plate annular shape fixed to the outer surface of the lower cup 3 is directed radially inward. (Four pieces) convex portions 20b are provided in an equal distribution, and the convex portions 20b respectively abut on the outer peripheral surface of the small-diameter cylindrical portion 14a of the bearing retainer 14 at their inner peripheral edges, whereby the bracket 20 is attached to the lower cup 3. The bracket 20 is easily positioned in the radial direction with respect to the bearing retainer 14 or the lower cup 3 when the bracket 20 is fixed. The other structure is the same as that of the first embodiment.
A front view, a left side view, a right side view and a rear view of the diaphragm actuator according to the second embodiment are respectively a front view, a left side view, a right side view and a rear view of the diaphragm actuator according to the first embodiment. It is the same.

[0030]

The present invention has the following effects.

That is, first, in the diaphragm actuator according to claim 1 of the present invention having the above-mentioned structure, between the bearing retainer supporting the bearing on the outer peripheral side of the bearing and the cup fixing the bearing retainer, Since an open annular recess is provided outside the cup, outside air is introduced into the recess at any time. Therefore, it is possible to cool the bearing at any time by the outside air introduced into the recess, thereby suppressing the early thermal deformation or thermal deterioration of the bearing, and to provide a diaphragm actuator exhibiting excellent heat resistance. be able to.

In addition to this, in the diaphragm actuator according to claim 1 of the present invention having the above-mentioned structure, the bracket fixed to the outer surface of the cup is provided with the communication passage for communicating the recess and the outside of the cup. Therefore, even if the bracket is fixed to the cup, the recess is not closed by the bracket, and the outside air is still introduced into the recess via the communication passage. Therefore, even if the diaphragm actuator has a bracket, the bearing is always supported by the outside air introduced into the recess through the communication passage.
It is possible to cool the bearing, so that it is possible to suppress early thermal deformation or thermal deterioration of the bearing, and it is possible to provide a diaphragm actuator that also exhibits excellent heat resistance. In addition, the diaphragm actuator with the above configuration
In a chute, the bearing has a meat steal part.
Easily dissipates heat due to its relatively large surface area
Yes. A diaphragm actuator according to claim 2 of the present invention.
In the case of Eta, the inner surface of the bracket is
Since the required number of convex parts are provided in a uniform pattern,
Bracket to bearing retainer or cup
Easy to position in the radial direction.

[Brief description of drawings]

FIG. 1 is a front view of a diaphragm actuator according to a first embodiment of the present invention.

FIG. 2 is a plan view of the same.

[Figure 3] Bottom view of the same

FIG. 4 is a left side view of the same.

FIG. 5 is an explanatory view of the internal structure of the same.

FIG. 6 is an enlarged view of a main part of FIG.

FIG. 7 Cross-sectional view of bearing

FIG. 8 is a plan view of a diaphragm actuator according to a second embodiment of the present invention.

FIG. 9 is a bottom view of the same.

FIG. 10 is a sectional view of a diaphragm actuator according to a conventional example.

[Explanation of symbols]

1 cup 2 upper cup 2a Top surface 2b vent 2c, 3d, 4a outer peripheral portion 3 lower cup 3a bottom 3b shaft hole 3c peripheral surface 3e Cylindrical part 3f Flange part 4 diaphragm 4b central part 5 rod 5a One end 5b the other end 6 joints 7 atmosphere room 8 pressure chambers 9 Diaphragm retainer 10,12 washers 11 Spring retainer 13 spring 14 Bearing retainer 14a Small diameter tubular part 14b Inner flange 14c Large diameter cylindrical part 14d outer flange 15 bearings 15a inner peripheral surface 15b outer peripheral surface 15c, 15d Axial end face 15e Meat stealing department 15f rib 16 Rod seal 16a mounting part 16b Bellows 16c lip part 16d inward lip 16e outward lip 17 recess 18 plates 19 stop ring 20 bracket 20a inner peripheral surface 20b convex part 21 bolts 22 passages

Claims (2)

(57) [Claims] 1. A cup (1) having a shaft hole (3b) and having a diaphragm (4) installed therein, and a bearing retainer (14) fixed to the periphery of the shaft hole (3b) of the cup (1). A bearing (15) supported by the bearing retainer (14);
5) which has a rod (5) slidably supported by 5) and whose one end (5a) is connected to the diaphragm (4), and which is on the outer peripheral side of the bearing (15) and the bearing retainer (14). ) And the cup (1), an annular recess (17) opened to the outside of the cup (1) is formed.
Bracket (2) provided and fixed to the outer surface of the cup (1)
0), and the bracket (20) has the recess (17) and the cover (20).
A communication passage (22) is provided to communicate with the outside of the top (1).
The bearing (15) has a meat stealing portion (15e).
A diaphragm actuator characterized by having a relatively large surface area . 2. The diaphragm actuator according to claim 1, wherein the inner peripheral surface (20a) of the bracket (20) has a radial inner surface.
The required number of protrusions (20b) are provided in a uniform pattern toward
The diaphragm actuator is characterized by