JPH0968205A - Power chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid a pressure receiving member from being twisted by the expansion and contraction of springs and prevent the springs from being oscillated horizontally. SOLUTION: A first and second springs SP1, SP2 wound in opposite directions are used which are arranged in series as springs for returning a diaphragm 3 serving as a pressure receiving member, and a movable member sandwiched between the ends of the first and second springs and freely displaced along with the ends is provided, so that the diaphragm 3 and an output rod 8 can be prevented from rotating. The movable member has a spring guide 26 almost concentric with the first and second springs SP1, SP2 to guide the first and second springs SP1, SP2, preventing the first and second springs SP1, SP2 from being oscillated horizontally and deformed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power chamber used as a fluid actuator for opening and closing a valve body.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing a non-operating state of a conventional power chamber. This power chamber is used as a fluid actuator, and a diaphragm 3 biased by a coiling spring 2 for returning in a housing 1.
The output rod 8 is connected to the diaphragm 3 via the diaphragm plate 4 and the sandwiching plate 5, and the diaphragm plate 4 receives one end of the spring 2.

When the power chamber is used as a fluid actuator for opening and closing the butterfly valve body of the exhaust brake device, the output rod 8 protruding from the housing 1 to the outside.
A tip end of a lever or the like attached to the valve shaft of a butterfly valve body (not shown) is connected to the tip end of the negative valve, and during operation, negative pressure is introduced into the negative pressure chamber 10 through the negative pressure line 9, and as shown in FIG. The diaphragm 3 is deformed to draw in the output rod 8, and when not operating, the diaphragm 3 is restored by the urging force of the coil spring 2 for returning and the output rod 8 projects.

When the power chamber is operated, the output rod 8 is pulled in to close the butterfly valve body, and when the power chamber is not operated, the diaphragm 3 is restored and the output rod 8 is projected to open the butterfly valve body. There is.

[0005]

The above-mentioned conventional power chamber has a drawback in that, during operation, the diaphragm plate 4 is rotated by the expansion and contraction of the spring 2 and the diaphragm 3 is twisted and the durability is impaired. In addition, when used for opening and closing the valve body of an exhaust brake device for an automobile, when the exhaust brake valve is not operated, the vibration of the engine causes the spring 2 to resonate and cause lateral vibration, which causes abnormal noise. there were.

The present invention has been made in view of the above-mentioned conventional drawbacks, and it is an object of the present invention to prevent the pressure receiving member from being twisted due to the expansion and contraction of a spring to rotate a diaphragm plate, which is a pressure receiving member. The purpose is to provide a power chamber in which the spring does not swing laterally.

[0007]

In order to achieve the above object, the present invention as set forth in claim 1, is a pressure receiving member that is displaced by receiving fluid pressure, and returns the pressure receiving member from an operating state to a non-operating state. A coil-shaped spring for storing in a housing, and an output rod having a tip protruding from the housing is connected to the pressure receiving member,
As the spring, a first spring and a second spring which are reversely wound are arranged in series and used, and a movable member which is sandwiched between the end portions of the first spring and the second spring and is displaceable together with the end portion is provided. The pressure receiving member can be prevented from rotating. The present invention according to claim 2 provides the power chamber according to claim 1,
The pressure receiving member is a diaphragm, and the movable member is provided with a diaphragm guide arranged substantially concentrically with the first spring and the second spring along a peripheral surface of the diaphragm to prevent deformation of the diaphragm. Characterize. According to a third aspect of the present invention, in the power chamber according to the first aspect, the movable member is provided with a substantially concentric spring guide for guiding the first spring and the second spring to prevent deformation. It is characterized by that.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail with reference to the drawings, taking a case where it is used as a negative pressure-operated fluid actuator for an exhaust brake device of an automobile as an example. FIG. 1 is a vertical cross-sectional view showing a non-operating state of a power chamber according to a first embodiment of the present invention, in which the same parts as those of the conventional device are designated by the same reference numerals.

This power chamber is used as a fluid actuator and has a diaphragm 3 inside the housing 1.
A diaphragm plate 4 and a sandwiching plate 5 that sandwich the same, a first coil SP1 of a coiled coil that is reversely wound, and a second coiled spring SP2 that has a larger diameter than the first coil SP1, and the first coil SP2. The movable member 6 is sandwiched between the ends of the spring SP1 and the second spring SP2 and is movable together with the ends. Further, in the power chamber, the output rod 8 is connected to the diaphragm 3, and the movable member 6 has both springs SP1 and SP2.
The diaphragm 3 and the output rod 8 can be prevented from rotating by rotating together with the end of the.

The housing 1 includes a first shell 11 and a second shell 11.
And the first shell 11
Connect the negative pressure line 9 to the port 1a provided at the center of
From the central through hole 12a of the second shell 12 to the output rod 8
Are projecting so as to be able to move in and out, and the outer peripheral edge 3a of the diaphragm 3 is held between the mutual mating surfaces of the shells 11 and 12.

The housing 1 also includes a first shell 11
And the diaphragm 3 form a negative pressure chamber 10,
Has a stepped stopper 11b and a spring receiving surface 11c on the inner surface of the shell 11, and the spring receiving surface 11c receives one end of the first spring SP1.
2 is provided with a stopper 12b protruding inward.

The diaphragm 3 has a center edge 3b sandwiched between the diaphragm plate 4 and the sandwiching plate 5, and the head 31 and the neck 32 of the output rod 8 are connected via the diaphragm plate 4 and the sandwiching plate 5. The output rod 8 is provided by the springs SP1 and SP2 arranged in series.
Is urged in the direction to project the tip of the.

The diaphragm plate 4 has a through hole 4a at the center through which the output rod 8 penetrates, and has a shallow dish shape with a curved edge 4b on the outer periphery, and the spring receiving surface 11c of the first shell 11 is formed.
An annular spring receiving surface 4c having a diameter larger than that of the second spring SP2 receives one end of the second spring SP2, and an end edge 3b near the center of the diaphragm 3 between the second spring SP2 and the holding plate 5 fitted to the neck portion 32 of the output rod 8 so as not to come off. , And as shown in FIG.
The curved edge 4b contacts the stopper 11b when the power chamber operates.

The holding plate 5 has a cylindrical mounting portion 5a in the center thereof, an outer peripheral portion thereof is bent toward the stopper 12b to form a curved edge 5b, and an annular ridge 5c provided on the inner peripheral side of the mounting portion 5a. Is fitted to the annular groove 32a of the neck portion 32 of the output rod 8 and attached to the output rod 8, and the curved edge 5b abuts the stopper 12b when not operating.

The movable member 6 has a small-diameter receiving plate 21 having a through hole 21a at the center corresponding to the first spring SP1.
A large-diameter receiving plate 22 corresponding to the second spring SP2 and a short tubular body 23 interposed therebetween are integrally formed,
The outer peripheral edge of the large-diameter receiving plate 22 is bent to form a ring-shaped diaphragm guide 22a, and the guide 22a is placed near the peripheral surface of the diaphragm 3 to prevent the diaphragm 3 from bulging and deforming.

In the movable member 6, the outer diameter of the diaphragm guide 22a is slightly smaller than the inner diameter of the curved edge 4b of the diaphragm plate 4, and when the power chamber is inactive,
The outer peripheral surface of the diaphragm guide 22a and the diaphragm 3
A gap is formed with the peripheral surface of the.

The movable member 6 receives the other end of the first spring SP1 whose one end is in contact with the spring receiving surface 11c of the first shell 11 by the small-diameter receiving plate 21, and the one end of which is the spring of the diaphragm plate 4. With the other end of the second spring SP2 in contact with the receiving surface 4c received by the large-diameter receiving plate 22,
It is sandwiched between the ends of the first spring SP1 and the second spring SP2, and is axially displaceable and angularly displaceable together with the ends.

The output rod 8 has a head portion 31 and a neck portion 32.
And a guide pin 33 integrally extending from the center of the head portion 31, and the guide pin 33 is provided in the through hole 2 of the movable member 6.
The movable member 6 is guided and held by being loosely fitted to the movable member 1a, and the movable member 6 is prevented from coming off by a retaining flange 33a at the end of the guide pin 33.

The power chamber is the housing 1
A coupling member (not shown) attached to the tip of the output rod 8 protruding from the outside is pin-joined to the valve body opening / closing lever, and a negative pressure circuit (not shown) is connected to the tip of the negative pressure line 9 connected to the housing 1. Has been done.

FIG. 2 is a vertical sectional view showing an operating state of the power chamber according to the first embodiment of the present invention. When the switching valve of the negative pressure circuit (not shown) is switched to the low pressure side and the pressure in the negative pressure chamber 10 of the power chamber drops, the diaphragm 3 resists the urging force of the first spring SP1 and the second spring SP2. The diaphragm 3 is deformed, the output rod 8 is drawn into the housing 1, and the valve shaft of the exhaust brake valve body is rotated through the lever to close the exhaust brake valve.

When the first spring SP1 and the second spring SP2 are expanded and contracted, the movable member 6 sandwiched by the two end portions of these two springs freely rotates together with the both end portions, so that the spring receiving surfaces 11c and 4c are contacted. The ends of the springs SP1 and SP2 that are in contact do not rotate, and therefore the diaphragm plate 4, the diaphragm 3 and the output rod 8 are not rotated.
It is possible to stop the rotation. Further, the diaphragm 3 is reliably prevented from bulging and deforming by the diaphragm guide 22a of the movable member 6.

FIG. 3 is a vertical sectional view showing a non-operating state of the power chamber according to the second embodiment of the present invention, and FIG. 4 is a vertical sectional view showing the operating state thereof, showing the first embodiment. The same reference numerals are given to the same or corresponding parts, and duplicate description of those parts will be omitted.

In the case of this embodiment, the first spring SP1 and the second spring SP2 have a cylindrical coil shape having substantially the same diameter, and the diaphragm plate 4 has a deep dish shape similar to that shown in FIG. The movable member 6 is integrally provided with a cylindrical spring guide 26. In the movable member 6, a flange 27 is provided so as to project at an intermediate position in the axial direction of the spring guide 26, the flange 27 is sandwiched between the end portions of both springs, and the outer periphery of the spring guide 26 has both springs SP1. , SP2 that expands and contracts along the inner circumference of SP2
To prevent its deformation.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. For example, the power chamber can be applied not only to the exhaust brake device but also to an air brake and a cylinder, and may be a power chamber of a type that is operated by positive pressure instead of negative pressure.

[0025]

According to the first aspect of the present invention, the first spring and the second spring, which are reversely wound with each other, are used in series as the springs, and the ends of the first spring and the second spring are arranged between them. By providing a movable member that is sandwiched between the movable member and the end portion and is displaceable with respect to the pressure receiving member, it is possible to prevent the pressure receiving member from being rotated due to expansion and contraction of the spring, and prevent the pressure receiving member from being twisted. There is an effect that can be. In the present invention as set forth in claim 2, the pressure receiving member is a diaphragm, and a diaphragm guide that is arranged substantially concentrically with the first spring and the second spring along the peripheral surface of the diaphragm to prevent deformation of the diaphragm is movable. Since the member is provided, it is possible to reliably prevent the diaphragm from being twisted. According to the third aspect of the present invention, since the movable member is provided with the spring guides arranged substantially concentrically for guiding the first spring and the second spring to prevent deformation, the lateral deflection of the spring can be prevented. You can

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a non-operating state of a power chamber according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing an operating state of the power chamber according to the first embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view showing a non-operating state of the power chamber according to the second embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing an operating state of the power chamber according to the second embodiment of the present invention.

FIG. 5 is a vertical sectional view showing a non-operating state of a conventional power chamber.

FIG. 6 is a vertical cross-sectional view showing an operating state of a conventional power chamber.

[Explanation of symbols]

 SP1 1st spring SP2 2nd spring 1 Housing 3 Diaphragm (pressure receiving member) 4 Diaphragm plate 5 Clamping plate 6 Movable member 8 Output rod 21 Small diameter receiving plate 22 Large diameter receiving plate 22a Diaphragm guide 23 Short cylinder 26 For spring guide

Claims (3)

[Claims] 1. A pressure receiving member that is displaced by receiving fluid pressure and a coil-shaped spring for returning the pressure receiving member from an operating state to a non-operating state are housed in a housing, and a tip of the housing is projected. In a power chamber in which an output rod is connected to the pressure receiving member, reversely wound first springs and second springs are arranged in series as the springs, and the first springs and the second springs are used.
A power chamber, wherein a movable member sandwiched between the ends of the spring is provided so as to be displaceable together with the ends so that the pressure receiving member can be prevented from rotating. 2. The power chamber according to claim 1, wherein the pressure receiving member is a diaphragm, and the movable member is arranged substantially concentrically with the first spring and the second spring along a peripheral surface of the diaphragm. A power chamber comprising a diaphragm guide for preventing deformation of the diaphragm. 3. The power chamber according to claim 1, wherein the movable member is provided with substantially concentric spring guides for guiding the first spring and the second spring to prevent deformation. Power chamber to do.