JP2005299812A - Fluid-pressure actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid-pressure actuator which curbs the vibrations of a rod so as to achieve an improvement in the durability thereof. <P>SOLUTION: The fluid-pressure actuator comprises a bearing 52 which is mounted in the second chamber R2 and supports a reciprocating rod 40 while permitting the vibrations of the rod 40, and an annular vibration preventing member 53 which is mounted in the second chamber R2 and absorbs the vibrations of the rod 40 by means of a plurality of convex portions 53b and 53c which are provided along the outer circumference of the rod 4 and contact with the rod 40. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fluid pressure actuator that converts energy generated by fluid pressure into mechanical energy.

  Conventionally, fluid pressure actuators used for driving various control valves such as an intake control valve, a butterfly valve, a waste gate valve for controlling a supercharging pressure of a turbocharger, and other driving components are known. (For example, refer to Patent Document 1). An example of this type of fluid actuator is shown in FIG. FIG. 9 is a schematic sectional view of a fluid pressure actuator according to a conventional example.

  As illustrated, the fluid pressure actuator 100 includes a diaphragm 103 in a case including a lower cup 101 and an upper cup 102. The diaphragm 103 divides the inside of the case into two chambers. The interior of the chamber on the lower cup 101 side is kept at atmospheric pressure. On the other hand, when the outside air is introduced into the chamber on the upper cup 102 side or the air is discharged from the room, the fluid pressure in the room fluctuates. The diaphragm 103 is deformed in response to the fluctuation of the fluid pressure. In accordance with the deformation of the diaphragm 103, the rod 104 fixed to the diaphragm 103 moves.

  In this way, the rod 104 can be reciprocated by changing the fluid pressure in the chamber on the upper cup 102 side and controlling the amount of displacement due to the deformation of the diaphragm 103. Further, a mechanism for causing mechanical movement is provided at the end of the rod 104 opposite to the side fixed to the diaphragm 103. For example, the end portion of the rod 104 is fixed at a position eccentric to the rotation center of the rotating body fixed to the rotating shaft, whereby the reciprocating motion of the rod 104 can be converted into the rotating motion of the rotating shaft. In this case, the rod 104 swings while reciprocating. Therefore, the bearing 105 of the rod 104 is configured to support the reciprocating rod 104 while allowing the rod 104 to swing. In the illustrated example, the bearing 105 can support the rod 104 that reciprocally moves while allowing the rod 104 to swing while having a barrel-shaped cross section.

In the fluid pressure actuator 100 configured as described above, the rod 104 and the diaphragm 103 to which the rod 104 is fixed may vibrate violently depending on the use environment or the like. For example, when the fluid pressure actuator 100 is used to drive various control valves in an automobile, the rod 104 may vibrate finely and vigorously due to pulsation of intake or exhaust. Such vibrations cause wear of the rod 104 and the diaphragm 103 and the parts connected to the rod 104, or cause noise.
No. 7-38722

  One of the objects of the present invention is to suppress the vibration of the rod.

  One of the objects of the present invention is to improve durability.

  One of the objects of the present invention is to suppress the generation of noise.

  The present invention employs the following means in order to solve the above problems.

The fluid pressure actuator of the present invention is
A diaphragm that divides the interior of the case into a first chamber in which the fluid pressure in the chamber is controlled and a second chamber in which the chamber is maintained at atmospheric pressure;
A rod that reciprocates while swinging in conjunction with a diaphragm that deforms in response to a change in fluid pressure in the first chamber,
A fluid pressure actuator that converts energy generated by fluid pressure in the first chamber into mechanical energy using the diaphragm and the rod,
A bearing that is provided in the second chamber and supports the rod that reciprocates while allowing the rod to swing;
An annular vibration isolating member that is provided in the second chamber and has a plurality of convex portions provided in the circumferential direction abuts on the rod and absorbs vibration of the rod.

  According to the configuration of the present invention, the vibration of the rod is absorbed by the vibration isolating member. Moreover, in this invention, the convex part provided in the circumferential direction contact | abuts to a rod, and absorbs the vibration of a rod. Therefore, since the vibration isolating member does not contact the entire circumference of the rod, the sliding resistance against the rod does not become too high. In addition, the second chamber is suitably maintained in an atmospheric pressure state without sealing the second chamber. From the above, the smooth movement of the rod can be maintained.

  Moreover, it is good for the outer periphery of the said vibration-proof member to provide the fastening member which increases the pressing force with respect to the rod of a some convex part.

  If the tightening member is provided in this way, the vibration remaining on the rod can be quickly stopped when the rod is stopped. Moreover, even when the convex portion of the vibration isolating member is worn due to deterioration with time, the state in which the convex portion is in contact with the rod can be maintained. Therefore, it is possible to suppress a decrease in the vibration isolation effect over time.

  As described above, according to the present invention, the vibration of the rod can be suppressed. Further, along with this, it is possible to suppress wear of each component, and to improve durability. Furthermore, the generation of noise due to rod vibration can be suppressed.

  The best mode for carrying out the present invention will be exemplarily described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

  A fluid pressure actuator according to a first embodiment of the present invention will be described with reference to FIGS.

<Overall description of fluid pressure actuator>
With reference to FIG. 1, the structure of the whole fluid pressure actuator which concerns on Example 1 of this invention is demonstrated. FIG. 1 is a schematic cross-sectional view of a fluid pressure actuator according to a first embodiment of the present invention.

As illustrated, the fluid pressure actuator 1 includes a case including a lower cup 10 and an upper cup 20, a diaphragm 30 provided in the case, and a rod 40 having one end fixed to the diaphragm 30. The lower cup 10 has an approximately cup shape, and an insertion hole 11 through which the rod 40 is inserted is provided at the bottom thereof. The upper cup 20 is also approximately cup-shaped, and a through hole 21 to which the pipe 70 is connected is provided at the bottom. The lower cup 10 and the upper cup 20 are fixed so that their open ends are aligned. The periphery of the diaphragm 30 is fixed by a fixing portion between the lower cup 10 and the upper cup 20. Thereby, the diaphragm 30 partitions the inside of the case into a first chamber R1 and a second chamber R2.

  One end of the rod 40 is fixed to the diaphragm 30 by, for example, screwing. Here, a first retainer 81 and a second retainer 82 are provided at the fixed portion of the diaphragm 30 and the rod 40 so as to sandwich the diaphragm 30. By the first retainer 81 and the second retainer 82, the diaphragm 30 functions so that only the periphery thereof is deformed without being deformed near the center. Thereby, the diaphragm 30 deforms regularly to some extent. The rod 40 can be directly fixed to the diaphragm 30 or can be indirectly fixed via the first retainer 81 and the second retainer 82 (for example, the first retainer 81 and the second retainer 82). Is fastened to the end of the rod 40 with a bolt, so that the diaphragm 30 can be sandwiched by these retainers and the rod 40 can be indirectly fixed to the diaphragm). The diaphragm 30 is made of a highly flexible material such as rubber or resin. The first retainer 81 and the second retainer 82 are made of a highly rigid material such as metal.

  A spring 60 is provided inside the lower cup 10. One end of the spring 60 abuts against the second retainer 82 and the other end abuts against the bottom of the lower cup 10. A support member 90 for attaching the fluid pressure actuator 1 to a desired position is provided outside the bottom of the lower cup 10.

<Operation of fluid pressure actuator>
In the fluid pressure actuator 1 configured as described above, gas (for example, air) is introduced into the first chamber R1 via the pipe 70, or gas is discharged from the first chamber R1. The fluid pressure inside the first chamber R1 varies according to the amount of gas in the first chamber R1. On the other hand, the inside of the second chamber R2 is maintained at atmospheric pressure. Moreover, the diaphragm 30 deform | transforms according to the fluctuation | variation of the fluid pressure inside 1st chamber R1. The deformation of the diaphragm 30 is regular to some extent as described above. The amount of displacement of the rod 40 accompanying the deformation of the diaphragm 30 is determined by the balance between the fluid pressure in the first chamber R1 and the spring force of the spring 60.

  From the above, by controlling the amount of gas introduced into and discharged from the first chamber R1, the fluid pressure inside the first chamber R1 varies, and the displacement of the rod 40 can be controlled. Thereby, for example, the rod 40 can be reciprocated.

  An attachment portion 41 to a mechanism (not shown) for causing mechanical movement is provided at an end portion of the rod 40 opposite to the fixing portion to the diaphragm 30. For example, with respect to a rotating body (rotating plate) fixed to the rotating shaft, the mounting portion 41 is fixed at a position eccentric from the rotating shaft. Thereby, when a rod 40 reciprocates, a rotary body rotates and a rotating shaft rotates. Thereby, for example, the valve body attached to the rotating shaft rotates, and control for opening and closing the valve can be performed. In addition, about the mechanism etc. which convert the reciprocating motion of the rod 40 into the rotational motion of another member, since it is a well-known technique, the detailed description is abbreviate | omitted.

  As described above, the fluid pressure actuator 1 can convert energy generated by fluid pressure (atmospheric pressure) into mechanical energy.

<Bearing and vibration isolation member>
In particular, a bearing and a vibration isolating member according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 2 is an enlarged view of a portion A in FIG. FIG. 3 is a plan view of the vibration isolating member according to Embodiment 1 of the present invention. FIG. 4 is a schematic cross-sectional view (cross-sectional view cut along the axis) of the vibration isolator according to Embodiment 1 of the present invention.

  Near the insertion hole 11 provided at the bottom of the lower cup 10, a bearing 52 for the rod 40 is provided. The bearing 52 is an annular member and is fitted on the outer periphery of the rod 40. The bearing 52 is made of a material having relatively high rigidity such as a metal or a resin material. Further, an appropriate clearance is provided between the inner peripheral surface of the bearing 52 and the outer peripheral surface of the rod 40. The gas can freely travel inside and outside the second chamber R2 through this clearance.

  Here, as described above, when the reciprocating motion of the rod 40 is converted into the rotational motion of the rotating shaft, the attachment portion 41 provided at the end of the rod 40 moves so as to rotate around the rotating shaft. . Therefore, the rod 40 swings while reciprocating. Therefore, the bearing 52 is configured to support the reciprocating rod 40 while allowing the rod 40 to swing. In the illustrated example, the bearing 52 can support the rod 40 that reciprocates while allowing the rod 40 to swing while the cross section is formed in a barrel shape.

  Further, a vibration isolating member 53 is provided adjacent to the bearing 52. The vibration isolating member 53 is also an annular member and is fitted into the outer periphery of the rod 40. The vibration isolation member 53 is made of an elastic material such as rubber (for example, HNBR, silicon, fluorine rubber) or a resin material.

  The vibration isolating member 53 abuts on the bearing 52, and a contact portion 53a that positions the bearing 52 in the axial direction, convex portions 53b and 53c that abut on the rod 40, and a groove 53d in which the support member 51 is fitted. It has. Four convex portions 53b and 53c are provided at equal intervals in the circumferential direction on one end side (bearing 52 side) and the other end side in the axial direction. These convex parts 53b and 53c are comprised so that it may contact | abut with respect to the rod 40 with a certain amount of interference. Moreover, the sliding resistance with respect to the rod 40 by these convex parts 53b and 53c needs to prevent the smooth movement of the rod 40 from being hindered. The adjustment of the sliding resistance can be performed according to the material and hardness of the vibration isolating member 53, or the shape, number and fastening margin of the convex portions 53b and 53c.

  With the above configuration, the vibration of the rod 40 is absorbed by the vibration isolation member 53 via the plurality of convex portions 53b and 53c, and thus the vibration of the rod 40 is suppressed. In addition, since the plurality of convex portions 53b and 53c are partially in contact with the rod 40, the vibration isolating member 53 has gas between the outer peripheral surface of the rod 40 and the inner peripheral surface of the vibration isolating member 53. There is a way. Therefore, the gas can freely travel inside and outside the second chamber R2. Accordingly, the atmospheric pressure state is maintained in the second chamber R2.

  The support member 51 is a cylindrical member and is fitted on the outer periphery of the bearing 52 and the vibration isolation member 53. The support member 51 is made of a material having relatively high rigidity such as metal. In addition, the support member 51 has one end of the cylindrical portion bent outward and the other end bent inward. The portion bent outward is fixed to the bottom side of the lower cup 10, and the portion bent inward is fitted into the groove 53 d of the vibration isolation member 53. The support member 51 positions the vibration isolation member 53.

<Effect of the fluid pressure actuator according to this embodiment>
According to the fluid pressure actuator 1 according to the present embodiment, the vibration of the rod 40 can be suppressed by providing the vibration isolation member 53. Thereby, wear of various parts (particularly parts driven by movement of rod 40) can be controlled. Therefore, the durability of various parts can be improved. Further, the generation of noise due to the vibration of the rod 40 can be suppressed. As described above, even if the vibration isolating member 53 is provided, it does not hinder the smooth movement of the rod 40, and the atmospheric pressure state in the second chamber R2 is kept good.

  5 and 6 show a second embodiment of the present invention. In this embodiment, an example of changing the shape of the vibration isolation member will be described. Since other basic configurations and operations are the same as those in the first embodiment, the description of the same components will be omitted. FIG. 5 is a plan view of a vibration isolating member according to Embodiment 2 of the present invention. FIG. 6 is a schematic cross-sectional view (cross-sectional view cut along the axis) of the vibration isolator according to Embodiment 2 of the present invention.

  The vibration isolating member 53A according to the present embodiment is provided with four slits 53e at equal intervals in the circumferential direction. In the vibration isolating member 53A according to the present embodiment, portions other than the slits 53e correspond to the convex portions 53b of the vibration isolating member 53 in the first embodiment. That is, portions other than the slits 53e abut on the rod 40. In addition, the diameter of the inner peripheral surface side of the vibration isolating member 53A according to the present embodiment is different in the axial direction. That is, the diameter in the region where the slit 53e is provided is slightly smaller than the diameter of the rod 40, and the diameter in the region where the slit 53e is not provided is slightly larger than the diameter of the rod 40. Accordingly, only in a region where the slit 53e in the radial direction is provided, a portion where the slit 53e is not provided contacts the rod 40.

  It goes without saying that the same effects as those of the first embodiment can be obtained in the vibration isolating member 53A configured as described above.

  7 and 8 show a third embodiment of the present invention. In this embodiment, an example in which a tightening member is added to the configuration of the first embodiment will be described. Since other basic configurations and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted. FIG. 7 is a schematic cross-sectional view (cross-sectional view cut along the axis) of the vibration isolator according to Embodiment 3 of the present invention. FIG. 8 is a partially enlarged view of a schematic cross-sectional view of a fluid pressure actuator according to a third embodiment of the present invention (a diagram corresponding to FIG. 2 in the first embodiment).

  The basic configuration of the vibration isolating member 53B according to the present embodiment is substantially the same as that of the vibration isolating member 53 according to the first embodiment. However, the anti-vibration member 53B according to the present embodiment differs from the anti-vibration member 53 according to the first embodiment only in that a spring 54 as a fastening member is fitted on the outer periphery on one end side. By providing this spring 54, the vibration isolating member 53B is tightened from the outer peripheral side, and the pressing force of the convex portion 53c against the rod 40 can be increased. Thereby, when the rod 40 stops, the vibration remaining on the rod 40 can be quickly stopped. Further, even when the convex portion 53c is worn due to deterioration with time, the state in which the convex portion 53c is in contact with the rod 40 can be maintained. Therefore, it is possible to suppress a decrease in the vibration isolation effect over time.

FIG. 1 is a schematic cross-sectional view of a fluid pressure actuator according to a first embodiment of the present invention. FIG. 2 is an enlarged view of a portion A in FIG. FIG. 3 is a plan view of the vibration isolating member according to Embodiment 1 of the present invention. FIG. 4 is a schematic cross-sectional view of the vibration isolator according to Embodiment 1 of the present invention. FIG. 5 is a plan view of a vibration isolating member according to Embodiment 2 of the present invention. FIG. 6 is a schematic cross-sectional view of a vibration isolating member according to Embodiment 2 of the present invention. FIG. 7 is a schematic cross-sectional view of a vibration isolating member according to Embodiment 3 of the present invention. FIG. 8 is a partially enlarged view of a schematic cross-sectional view of a fluid pressure actuator according to a third embodiment of the present invention. FIG. 9 is a schematic sectional view of a fluid pressure actuator according to a conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluid pressure actuator 10 Lower cup 11 Insertion hole 20 Upper cup 21 Through-hole 30 Diaphragm 40 Rod 41 Mounting part 51 Support member 52 Bearing 53, 53A, 53B Anti-vibration member 53a Contact part 53b, 53c Convex part 53d Groove 53e Slit 54 Spring 60 Spring 70 Piping 81 First retainer 82 Second retainer 90 Support member R1 First chamber R2 Second chamber

Claims (2)

A diaphragm that divides the interior of the case into a first chamber in which the fluid pressure in the chamber is controlled and a second chamber in which the chamber is maintained at atmospheric pressure;
A rod that reciprocates while swinging in conjunction with a diaphragm that deforms in response to a change in fluid pressure in the first chamber,
A fluid pressure actuator that converts energy generated by fluid pressure in the first chamber into mechanical energy using the diaphragm and the rod,
A bearing that is provided in the second chamber and supports the rod that reciprocates while allowing the rod to swing;
A fluid pressure actuator comprising: an annular vibration isolating member that is provided in the second chamber and that has a plurality of protrusions provided in the circumferential direction in contact with the rod and absorbs vibration of the rod.   The fluid pressure actuator according to claim 1, wherein a tightening member that increases a pressing force against the rods of the plurality of convex portions is provided on an outer periphery of the vibration isolation member.

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