JPH10184606A - Actuator and exhaust braking device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust braking device with an actuator stationed in such a manner that this device is easily assembled in a small mounting space, and that an axis of an actuator output rod and that of a valve shaft are brought into the same straight line when the actuator is used having the rotatable output rod. SOLUTION: An actuator 1 is provided in a first chamber A or a second chamber B, and conversion mechanisms 8, 9 and 10 convert straight-line movement of a retainer 6 into rotational movement, and an output rod 11 is provided for externally outputting the rotational movement conveyed from the conversion mechanisms 8, 9 and 10. A cylindrical exhaust passage 21 is formed in a body 20 of an exhaust control valve, and a shaft hole 23 is bored in both side wall parts of the body 20 in order to insert a valve shaft 22. A butterfly valve body 24 capable of being opened and closed is disposed in the exhaust passage 21 in such a state as rotatably supported by the valve shaft 22. The output rod 11 is installed in the valve shaft 22 in such a manner that an axis of the output rod 11 matches that of the valve shaft 22 of an exhaust gas control valve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator and an exhaust brake device using the same, and more particularly, to an actuator having an output rod configured to make a rotary motion and an actuator using the actuator. The present invention relates to an exhaust brake device for controlling an exhaust gas control valve such as a butterfly valve provided in an exhaust passage of an automobile or the like.

[0002]

2. Description of the Related Art Diaphragm actuators have been known as actuators. A general diaphragm actuator includes an upper cover having a negative pressure or positive pressure inlet, a lower cover fixed to the upper governor, the upper cover and a lower cover.
And a diaphragm mounted between them, and is configured to output the movement of the diaphragm caused by the introduction of the negative pressure to an external mechanism.

On the other hand, an exhaust brake device is mainly mounted on a truck, a bus, or the like, and closes an exhaust gas control valve disposed in the middle of an exhaust pipe to reduce the acceleration of the vehicle caused during a descent or the like. Used as an auxiliary brake for canceling. In this exhaust brake device, the actuator is used to operate an exhaust gas control valve disposed in the middle of an exhaust pipe, and an output from an output rod of the actuator is transmitted through a link mechanism. The power is transmitted to an exhaust gas control valve. That is, the linear motion of the output rod of the actuator is converted into a rotary motion by a link mechanism, and the opening and closing operation of the exhaust gas control valve is performed.

FIG. 6 shows an actuator disclosed in Japanese Patent Application Laid-Open No. 5-171961 and an exhaust brake device using the same, and the prior art will be described in detail with reference to FIG. FIG. 6 is a sectional view of the exhaust gas control valve and the actuator. As shown in the figure, a cylindrical exhaust passage 10 is provided in the body 100 of the exhaust gas control valve.
1 is formed, and a shaft hole 103 for allowing the valve shaft 102 to pass therethrough is formed in the side wall portions on both sides thereof.
1, a butterfly type valve element 104 is provided so as to open and close the passage 101, and the valve element 104 is fixed to the valve shaft 102 with bolts. Further, the right side portion of the valve shaft 102 is formed long so as to be connected to the actuator side.
The valve shaft 102 has a shaft hole 103 formed in the body 100.
The bush 105 is inserted into the valve shaft in the shaft hole 103 on the left side of FIG. 6, and the outside of the shaft hole 103 is closed by the closing portion rate 106.

On the other hand, a seal ring 107 is externally fitted to the valve shaft 102 in the shaft hole 103 on the right side, and a bush 108 is fitted on the right side thereof. The tip of the valve stem 102 projects from the body 1, and a plate 10
9 is screwed and fixed so as to close the shaft hole 103. A diaphragm shaft 1 protruding from the body 100 is connected to the diaphragm actuator 1 via a lever 110.
Eleven output rods 112 are connected. Note that the diaphragm actuator 111 is fixed to the body 100 via a bracket 113.

[0006] The actuator 111 has a first and a second partitioned by a diaphragm 114 therein.
It has chambers 115a and 115b, and a negative pressure inlet 117 is formed on the first chamber 115a side. An output rod 112 is connected to a central portion of the diaphragm 114 via a retainer 116, and an end of the output rod 112 is connected to the valve shaft 102 via a link lever 110. A spring 118 for returning the retainer 116 to the initial state is provided on the second chamber side.

The exhaust gas control valve of the exhaust brake device having the above-described structure is usually placed in a state where the exhaust passage 101 is opened. When the exhaust brake activation switch is turned ON while the engine is running and the foot is released from the accelerator pedal and the clutch pedal,
When a negative pressure from a vacuum tank provided in the vehicle is introduced into the first chamber 115a, the diaphragm 11
4 and the retainer 116 move, and the output rod 113 makes a linear motion. This movement is converted into rotational movement by the link lever 110, and this rotational movement causes the valve element 104 to rotate.
Opens the exhaust passage 101.

[0008]

By the way, the output rod of the conventional actuator makes a linear motion because it is connected to the diaphragm. Therefore, in order to operate an exhaust gas control valve such as a butterfly valve with the output rod, a link mechanism or the like for converting a linear motion into a rotary motion is indispensable.

[0009] However, this conventional link mechanism is
Since the actuator is provided outside the cover of the actuator and a long lever is used, the exhaust brake device as a whole is large and requires a lot of space to be mounted on a vehicle. There were technical challenges.

In particular, when the actuator is erected as shown in FIG. 6, the height of the exhaust brake device becomes large,
This made it difficult to mount it on a vehicle. In order to solve this problem, there is a type in which the actuator is attached to a body so that the actuator is parallel to the exhaust passage (the output rod is parallel to the exhaust passage). In this exhaust brake device, the height can be suppressed, but since the actuator is close to the exhaust passage, a heat shield plate is newly provided between the actuator and the body having the exhaust passage. There was a technical problem that had to be provided in.

When the actuator is disposed at a position where the axis of the output rod intersects with the axis of the valve shaft, the linear motion of the output rod is hindered by the valve shaft, and the linear motion of the output rod is converted into a rotary motion. Cannot be converted. Therefore, it is necessary to arrange the actuator so that the axis of the output rod does not coincide with the axis of the valve shaft. As a result, there has been a technical problem that the exhaust brake device becomes large as a whole.

In the conventional exhaust brake device, since the linear motion of the output rod is converted into the rotational motion of the exhaust gas control valve, the output rod axis is positioned on a plane perpendicular to the valve axis. The actuator must be located. Therefore, the requirement to arrange the actuator in the axial direction of the valve shaft (to arrange the actuator so that the axis of the output rod of the actuator and the axis of the valve shaft are on the same straight line) is satisfied. However, there was a technical problem that there were restrictions on vehicle design.

Further, when assembling the actuator with the exhaust gas control valve, there is a technical problem that the link mechanism must be attached to the valve shaft and to the rod, so that the assembly cannot be easily performed.

The present invention has been made to solve the above-mentioned technical problems, and an actuator capable of outputting an output from a rod of an actuator as a rotary motion.
The purpose is to provide data. In addition, the present invention uses the actuator so that it is easy to assemble, has a small mounting space, and furthermore, the axis of the output rod of the actuator and the axis of the valve shaft are aligned on the same straight line. It is an object of the present invention to provide an exhaust brake device in which an actuator can be arranged.

[0015]

According to an embodiment of the present invention, there is provided an actuator comprising a first cover and a second cover fixed to the first cover. ,
A negative or positive pressure inlet provided in either the first cover or the second cover;
A diaphragm mounted between the first cover and the second cover and dividing the chamber into a first chamber and a second chamber; a retainer mounted on the diaphragm; and a gap between the first cover and the retainer. Or a spring mounted between the second cover and the retainer, and a converter provided in the first chamber or the second chamber for converting a linear movement of the retainer into a rotational movement. And a rotation rod output from the conversion mechanism to the outside.

Here, the conversion mechanism is fixed to a T-shaped rod pivotally attached to the retainer and a bottom surface of the second cover, and extends from one end to the other end. A cylindrical outer holder having an opening groove formed linearly along an axis, and having an opening groove formed in a bottomed shape and having an arc shape from one end to the other end, and It preferably includes an inner holder rotatably housed in the holder and having an output rod mounted on the bottom surface thereof.

The conversion mechanism includes an opening groove formed obliquely on a side wall of the second cover, a rod pivotally attached to the retainer, and a tip end of the rod. A shaft mounted substantially at a right angle, wherein the shaft is preferably engaged with an opening groove of the second cover. Then, a pair of projections are formed at the distal end of the rod, and the projections are engaged with the opening grooves of a connecting member having an opening groove formed along an axis from one end to the other end, Preferably, the connecting member is an output rod.

An exhaust brake device according to the present invention, which has been made to achieve the above object, comprises a first cover, a second cover fixed to the first cover, and First
The first and second chambers are mounted between the first and second covers and the negative or positive pressure inlet provided in either the cover or the second cover. And a retainer attached to the diaphragm, between the first cover and the retainer, or between the second cover and the retainer. A spring, a conversion mechanism provided in the first chamber or the second chamber for converting a linear movement of the retainer into a rotary movement, and an output rod for outputting the rotary movement from the conversion mechanism to the outside. The axis of the output rod of the actuator is provided with a body of an exhaust control valve having a cylindrical exhaust passage formed therein, and a valve shaft formed in both side walls of the body for inserting the valve shaft. A shaft hole, which is supported by the valve shaft, An output rod of the actuator is mounted on the valve shaft of the exhaust gas control valve so as to coincide with the axis of the valve shaft of the exhaust gas control valve having a butterfly type valve body disposed so as to be able to open and close the path. It is characterized by having.

In the actuator constructed as described above, a negative pressure or a positive pressure is introduced from a negative pressure or a positive pressure introduction port provided in either the first cover or the second cover. Then, the retainer attached to the diaphragm moves linearly. The linear motion of the retainer is converted into a rotary motion by a conversion mechanism and transmitted to an output rod for outputting to the outside. As described above, the actuator according to the present invention can output the rotation to the external device from the output rod.

In particular, in the actuator having the conversion mechanism according to the second aspect, the T-shaped rod is formed in the opening groove of the outer holder with the vertical movement (linear movement) of the retainer. Up and down (linear movement) along the
Has an open groove formed in an arc shape, and is rotated by the vertical movement (linear movement) of the T-shaped rod. The rotation of the inner holder is transmitted from the output rod to the external device. Such a conversion mechanism is smaller in size than a conventional link mechanism, can be housed inside the actuator, and does not increase the size of the actuator.

Similarly, in the actuator having the conversion mechanism according to the third aspect of the present invention, the opening groove formed obliquely on the side wall of the second cover, and A rod rotatably attached to a retainer, and a shaft mounted substantially at right angles to a tip of the rod, wherein the shaft is engaged with an opening groove of the second cover. As a result, the shaft is rotated by the opening groove with the vertical movement (linear movement) of the retainer, and as a result, the rod is rotated. In this conversion mechanism, the rod slides in the axial direction of the rod. In order to cancel the movement amount, a connecting member having an opening groove formed along an axis from one end to the other end is attached to the tip of the rod.

The exhaust brake constructed as described above
Since the actuator uses an actuator that outputs a rotational motion, the actuator can be mounted so that the axis of the output rod and the axis of the valve shaft are on the same straight line. The size of the brake device as a whole can be reduced, and the degree of freedom in vehicle design can be increased. In particular, in this exhaust brake device, the height can be suppressed, and since the actuator is not provided near the exhaust passage, a heat shield plate is provided outside the cover of the actuator. This eliminates the need to protect the actuator. Further, when the actuator is mounted on the valve shaft of the exhaust gas control valve, the output rod can be directly mounted on the valve shaft, so that the assembly can be performed easily.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an actuator and an exhaust brake device according to the present invention will be described below. In the description of this embodiment, an actuator that operates at a negative pressure will be described. However, the actuator according to the present invention is not particularly limited to an actuator that operates at a negative pressure. The present invention can naturally be applied to an actuator that operates with. 1 and 2 are side sectional views of an actuator and an exhaust brake device according to the present invention. FIG. 1 shows a state in which a butterfly type valve element is opened, and FIG. 2 shows the butterfly valve. Indicates a closed state. 1 and 2, the inner holder is shown in partial cross section. FIG. 3 is an exploded perspective view of a main part of the actuator according to the present invention.

In the figure, an actuator 1 includes an upper cover (first cover) 2 having a negative pressure inlet 3,
A lower cover fixed to the upper cover 2 (second
4, the upper cover-2 and the lower cover
4, a diaphragm 5 that divides into a first chamber A and a second chamber B, a retainer 6 attached to the diaphragm 5, an upper cover 2 and the retainer 6. A spring 7 attached between the spring 7 and the retainer
A cylindrical member having a T-shaped rod 8 pivotally attached to the nut 6 and an opening groove 9a attached to the bottom surface of the lower cover 4 and formed along one axis from one end to the other end; -Shaped outer holder -9, and having an opening groove 10a formed in a circular arc from one end to the other end with a bottom, and rotatably housed in the outer holder -9. It has a holder-10 and an output rod 11 fixed to the bottom surface of the inner holder-10.

Here, an opening 4a through which the output rod 11 is inserted is formed on the bottom surface of the lower cover-2. A flange is formed in the outer holder 9 as shown in FIG. 3, a bolt insertion hole 9b for attaching the outer holder 9 to the lower cover 4, and an opening 9c through which the output rod 11 is inserted. Is provided. Further, the inner holder-10
Has an opening 10b through which the output rod 11 is inserted and fixed.
Are formed. The negative pressure inlet 3 is provided with a lower cover.
4 may be provided, but if provided on the lower cover-4 side, in order to prevent air from entering between the output rod 11 and the lower cover-4, machining accuracy is increased or airtightness is maintained. It is necessary to provide members. Also, since the spring 7 returns the retainer 6 to the initial state, if the retainer 6 can be returned to the initial state, the lower cover 4 and the retainer 6 will not be connected to each other. It may be attached in between.

As shown in the figure, a cylindrical exhaust passage 21 is formed in the body 20 of the exhaust gas control valve.
A shaft hole 23 for allowing the valve shaft 22 to pass therethrough is formed in the side wall portions on both sides thereof, and a butterfly type valve element 24 is disposed in the exhaust passage so as to open and close the path. It is fixed to the valve shaft 22. The valve shaft 22 is formed long to be connected to the actuator side. In the above description, the output rod 11 and the valve shaft 22 on the actuator side are
Although described as a separate member, the valve shaft 22 on the actuator side may be formed long and may be directly attached to the bottom surface of the inner holder 10. Further, a collar 25 made of a material having a low thermal conductivity such as resin may be interposed between the body 20 and the lower cover 4 to block heat transfer from the exhaust passage 21. Further, a lubricant such as oil may be applied to the inner holder 10, the outer holder 9, and the shaft 8a to make the operation smooth.

Next, the operation of the actuator and the exhaust brake device according to the present invention will be described. Normally, the valve element 24 is placed in a state where the cylindrical exhaust passage 21 is opened as shown in FIG. When the exhaust brake activation switch is turned on while the engine is running and the foot is released from the accelerator pedal and the clutch pedal, the negative pressure from the vacuum tank provided in the vehicle causes
The state of the actuator 1 changes from the state shown in FIG. That is, a negative pressure is introduced into the first chamber from the negative pressure inlet 3 provided in the upper cover 2, and the retainer 6 is moved toward the negative pressure inlet 3 in the drawing while resisting the repulsive force of the spring 7. Go to

At this time, the rod 8 is attached to the retainer 6, and the shaft 8a provided at the tip of the rod is connected to the opening groove 9 of the outer holder 9 and the inner holder 10.
a and 10a. Therefore, as the retainer 6 moves in the direction of the negative pressure inlet 3 in the figure, the shaft 8
a also moves. At this time, as described above, the shaft 8a
Is engaged with the opening groove 9a of the outer holder 9 and moves without rotating. However, the inner holder 1
Since the opening groove 10 of 0 is formed in an arc shape, the inner holder 10 rotates as the shaft 8a rises.

The rotation of the inner holder 10 is transmitted to an output rod 11 fixed integrally with the inner holder 10. In this manner, the rotary motion is output from the output rod 11 of the actuator 1. Then, the rotation is transmitted to the valve shaft 22 connected to the output rod 11, and finally the exhaust passage 21 is closed by the valve element 24 as shown in FIG. As described above, by controlling the flow rate of the exhaust gas by the exhaust gas control valve, the exhaust brake device functions as an auxiliary brake for canceling the acceleration of the vehicle that occurs when the vehicle is going downhill.

When the introduction of the negative pressure from the vacuum tank provided in the vehicle is stopped, the retainer 6 moves in the direction opposite to the direction of the negative pressure introduction port 3 by the repulsive force of the spring 7, and the above-described operation is performed. An operation reverse to the operation is performed, and the state shown in FIG. 2 returns to the state shown in FIG.

Next, a second embodiment of the actuator according to the present invention will be described with reference to FIGS. FIG. 4 is an exploded perspective view of the actuator according to the present invention, and FIG. 5 is a schematic cross-sectional view illustrating an operation state of the actuator shown in FIG. (B) is a side view of (a), (c)
FIG. 4 is a view showing a state where the rod of the actuator has rotated D in the direction C, and FIG. 4D is a side view of FIG.

Referring to the drawing, an actuator 31 according to this embodiment has an upper cover 32 having a negative pressure inlet 33, and is fixed to the upper governor 32, and is inclined to the side wall thereof. A lower cover 34 having an opening groove 34a formed therein, and a first chamber A and a second chamber B mounted between the upper cover 32 and the lower cover 34.
A diaphragm 35 that is divided into
And a retainer 36 attached to the upper cover.
A spring 37 mounted between the retainer 32 and the retainer 36, an output rod 38 pivotally mounted on the retainer 36, and a substantially right angle mounted on the tip of the output rod 38. A shaft 38a, and the shaft 38a is engaged with the opening groove 34a of the lower cover 34. The tip of the output rod 38 extends from the opening 34b formed in the lower cover 34 through the cover-3.
4 project outside.

The actuator 31 constructed as described above
Is normally in the state shown in FIG. When a negative pressure is applied to the negative pressure inlet 33, the retainer 36 moves to the negative pressure inlet 33 side. Accordingly, the output rod 38 also moves, but the shaft 38a attached to the output rod 38 is engaged with the opening groove 34a of the lower cover 34, and thus moves within the opening groove 34a. As a result, the rod 38 rotates in the direction C and rotates by about 90 degrees, thereby closing the butterfly valve element 24. Therefore, by attaching the valve shaft 22 to the output rod 38,
The butterfly valve element 24 can be opened and closed.

In this embodiment, the rod 3
When the rod 8 rotates, the rod 38 moves in the axial direction, so that it is desirable to provide a means for canceling the movement amount. That is, as shown in FIG. 5, a projection 38 b is formed at the tip of the output rod 38, and the projection 38 b is engaged with an opening groove 39 a formed in the axial direction of the cylindrical connecting member 39, and It is preferable that the movement in the axial direction be absorbed by the connecting member 39 and only the rotation be transmitted to the valve shaft 22.

[0035]

As is apparent from the above description, in the actuator according to the present invention, the rotational movement can be output from the output rod to the external device. Further, when the actuator according to the present invention is used in the exhaust brake device, a link mechanism for converting a linear motion into a rotary motion as in the related art can be dispensed with. As a result, the exhaust brake device using the actuator according to the present invention can be reduced in size as compared with a conventional exhaust brake device, and can be used in a large number of spaces even when mounted on a vehicle.
This has the effect of not requiring a source.

Further, in the actuator according to the present invention, since rotational movement is output from the output rod of the actuator, the axis of the output rod and the axis of the valve shaft are aligned in the exhaust brake device. The actuators can be arranged so as to be collinear. Therefore, it is possible to satisfy the demand for arranging the actuator in the direction of the valve shaft, and to obtain the effect of not being restricted by the vehicle design. In particular, since the height of the exhaust brake device can be suppressed, and the actuator is not provided close to the exhaust passage,
This has the effect of eliminating the need to protect the actuator by providing a heat shield plate outside the cover of the actuator.

Further, the actuator can be directly assembled to the valve shaft of the butterfly type valve body, so that there is an effect that the assembly can be easily performed.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an actuator and an exhaust brake device according to the present invention, and FIG. 1 is a view showing a state in which a butterfly valve element is opened.

FIG. 2 is a side sectional view of the actuator and the exhaust brake device according to the present invention, and FIG. 2 is a view showing a state in which a butterfly valve element is closed.

FIG. 3 is an exploded perspective view of a main part of the actuator according to the present invention.

FIG. 4 is an exploded perspective view of a second embodiment according to the present invention.

5A and 5B are schematic cross-sectional views illustrating an operation state of the second embodiment, in which FIG. 5A is a side cross-sectional view illustrating a normal state, FIG. 5B is a side view of FIG. () Is a side sectional view showing a state where the rod has rotated D in the C direction, and (d) is a side view of (c).

FIG. 6 is a diagram showing a cross section of a conventional actuator and exhaust brake device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Actuator 2 Upper cover (1st cover) 3 Negative-pressure introduction port 4 Lower cover (2nd cover) 4a Opening 5 Diaphragm 6 Retainer 7 Spring 8 Rod 8a Shaft 9 Outer holder 9a Opening groove 10 Inner holder 10a Opening groove 11 Output rod 20 Body 21 Exhaust passage 22 Valve shaft 23 Shaft hole 24 Valve body 25 Color 31 Actuator 32 Upper cover (first cover) 33 Negative pressure introduction Mouth 34 Lower cover (second cover) 34a Opening 35 Diaphragm 36 Retainer 37 Spring 38 Rod 38a Projection 39 Connector 39a Opening groove

Claims (5)

[Claims] 1. A first cover, a second cover fixed to the first cover, and a negative pressure provided to either the first cover or the second cover. Alternatively, a positive pressure inlet, a diaphragm mounted between the first cover and the second cover, and divided into a first chamber and a second chamber, a retainer mounted on the diaphragm, First
A spring mounted between the cover and the retainer or between the second cover and the retainer; and a spring provided in the first chamber or the second chamber.
An actuator, comprising: a conversion mechanism for converting a linear movement of a screw into a rotary motion; and an output rod for outputting the rotary motion from the conversion mechanism to the outside. 2. The conversion mechanism has a T-shaped rod pivotally attached to the retainer, and is fixed to a bottom surface of the second cover, and has an axis extending from one end to the other end. A cylindrical outer holder having an opening groove formed linearly along the outer holder, and having a bottomed opening groove formed in an arc shape from one end to the other end, and the outer holder 2. An actuator as claimed in claim 1, further comprising an inner holder rotatably housed therein and having an output rod mounted on a bottom surface thereof. 3. A conversion mechanism comprising: an opening groove formed obliquely on a side wall of a second cover; a rod pivotally attached to the retainer; and a tip of the rod. 2. An actuator according to claim 1, further comprising a shaft mounted substantially at a right angle, wherein said shaft is engaged with an opening groove of said second cover. 4. A connecting member having a pair of projections formed at the distal end of the rod and having the opening formed along one axis from one end to the other end. 4. The actuator according to claim 3, wherein said connecting member is an output rod. 5. A first cover, a second cover fixed to the first cover, and a negative pressure provided to either the first cover or the second cover. Alternatively, a positive pressure inlet, a diaphragm mounted between the first cover and the second cover, and divided into a first chamber and a second chamber, a retainer mounted on the diaphragm, First
A spring mounted between the cover and the retainer or between the second cover and the retainer; and a spring provided in the first chamber or the second chamber.
The axis of an output rod of an actuator having a conversion mechanism for converting a linear movement of a rotary motion into a rotary motion, and an output rod for outputting the rotary motion from the conversion mechanism to the outside, has a cylindrical exhaust passage. A body of the formed exhaust control valve;
A shaft hole through which a valve shaft formed in both side walls of the body is inserted, and a butterfly type valve body which is rotatably supported by the valve shaft and arranged to open and close a passage in an exhaust passage. An exhaust brake device, wherein an output rod of an actuator is mounted on a valve shaft of the exhaust gas control valve so as to coincide with an axis of a valve shaft of the exhaust gas control valve provided.