JPH0154531B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drive device for a butterfly valve used in an exhaust brake of an automobile.

[Prior Art] FIG. 6 shows a side sectional view of a conventional butterfly valve driving device, and the actuator 6 is
A displacement chamber 6b formed by a diaphragm 6c and a spring 6a are installed inside, the rod 6d is interlocked with the diaphragm 6c, and the pin 6e fitted to the rod 6d is rotatably and slidably fitted to the crank 7a. A butterfly in an exhaust pipe (not shown) is connected to the shaft 7 fitted to the crank 7a, and 7b and 7c serve as stoppers for stopping the rotation angle of the crank 7a at a predetermined position.

In the conventional configuration shown in FIG. 6, the operation is as follows.

The illustrated state in FIG. 6 is the displacement chamber 6b.
When compressed air is not being fed under pressure, at this time, the urging force of the spring 6a rotates the crank 7a around the shaft 7 via the rod 6b and the pin 6e, and in this rotation, the crank 7a
shows a state where it is stopped at the position of the stopper 7c, and in this state, the butterfly of the shaft 7 is set in the open state, and the exhaust brake by the engine is not applied.

On the other hand, when compressed air is forced into the displacement chamber 6b, the diaphragm 6c is pushed up, and the rod 6d rotates around the shaft 7 via the pin 6e until the crank 7a abuts against the stopper 7b. As a result, the butterfly valve closes and the exhaust brake is applied to the engine.

[Problems to be Solved by the Invention] The drive device for the butterfly valve described above is installed in the exhaust pipe of an automobile, and therefore vibrates very strongly during driving conditions. In the actuator 6 using the diaphragm 6c, the vibration causes the diaphragm 6 to
There is a problem that c is susceptible to vibration damage during long use.

Also, since the shaft 7 is exposed to high-temperature exhaust gas from the exhaust pipe, it is desirable to reduce the force on the shaft 7, but if the force on the shaft 7 is reduced in this way, the butterfly valve drive system When the above-mentioned vibration is added to the backlash, the durability of the drive system becomes a problem.

If the biasing force of the spring 6a is made strong in the illustrated state, even if there is play in the pin 6e, the drive system will be pressed to one side by the strong biasing force of the spring 6a, and the play will not occur. do not have. However, if the crank 7a is pressed against the stopper 7c by that strong force, the stopper 7c
Using c as a fulcrum, a reaction force of the force applied to pin 6e is generated on shaft 7, and a large force is applied to shaft 7, which is hot. Conversely, if the urging force of spring 6a is weakened, Since the mass from the diaphragm 6c to the rod 6d is large, large vibrations are generated due to the above-mentioned vibrations and play in the pins 6e and the like.

This problem is the same when operating the crank 7a toward the stopper 7b. The operation is performed by compressed air forced into the displacement chamber 6b against the urging force of the spring 6a,
This is because when the compressed air pressure is high, a large force similarly acts on the shaft 7, and when the compressed air is low, vibrations due to play become large as described above.

An object of the present invention is to provide a butterfly valve drive device that does not generate a large force on the shaft 7 that drives the butterfly and makes it difficult to generate vibrations due to backlash in the butterfly drive system.

[Means to solve the problem] The present invention consists of the following configuration.

(a) A crank that rotates around the pin is fitted to the pin that rotates the butterfly, and the other cranks are fitted to other pins fitted to the body, and the other cranks are fitted with other pins that are fitted to the body. The other end of the crank is in a rocking interlocking relationship with a portion of the crank that is separated from the pin by pin connection, and in the other crank, between the other pin and the portion of the pin connection, there is a relationship between the other crank and the other crank. (b) a diaphragm is secured to the other end of the rod with respect to the other pin connection portion via a push plate, and a side plate extends around the outer periphery of the diaphragm; The rod is gripped and forms a stopper in the axial direction of the rod relative to the diaphragm, a displacement chamber is formed by the side plate and the diaphragm, and a biasing force of a spring is applied to the rod toward the displacement chamber. (c) an elastic member is provided to limit radial vibration of the rod; (d) a stopper is provided in the direction in which the crank swings to limit a swing angle on one side of the swing; , another stopper is provided for limiting the swing angle on the other side of the swing, and (e) the other end of the other crank is biased toward the displacement chamber. It is characterized by the fact that it provides a spring force.

[Effect] (a) In the above [Means for solving the problem]
With configuration (a), regarding the swinging around the other pin in the other crank, compared to the swinging of the other pin connection part, the other end of the other crank expands into the swinging range and other parts. The force generated at the end can be made smaller than the force generated at the rod.

This means that the other end of the other crank can reduce the force of the pin connection part that swings the crank around the pin, and does not apply a large force to the pin that drives the butterfly, which is hot. That would be enough.

(b) With the configuration in (b) above, when the displacement chamber is open to atmospheric pressure, the diaphragm is sandwiched between the push plate and the side plate by the force of the spring. If the spring biasing force at this time is made sufficiently large, the diaphragm will not vibrate due to the clamping force.

Conversely, when compressed air is being forced into the displacement chamber, the pressure of the compressed air will push the diaphragm toward the push plate, so make sure the compressed air pressure is sufficiently high. If this is done, the diaphragm will not vibrate due to the pressing force.

(c) At this time, since the rod is fixed to the push plate, its vibration in the axial direction does not vibrate together with the diaphragm, but the horizontal vibration of the rod becomes a problem. However, due to the presence of the elastic material in the configuration (c) above, the vibration can be made gentler.

(d) In the above case, even if the spring force is sufficiently increased, the joints between the other cranks and the rods are in a loose interlocking relationship when the displacement chamber is open to the atmosphere. Therefore, in this state, that is, when the butterfly valve drive device is not operating, the rod does not exert a large force on other crank rods.

(E) With the configuration in (e) above, even if there is play between the pin connections between the rod and other cranks, or between the crank and other cranks, the spring force applied to the other cranks will be maintained. As a result, each pin connection is in a state where its backlash is pressed to one side, and even if vibration is applied to the butterfly valve drive device, the vibration of the drive system will be very small.

In particular, on the side with a very large mass between the rod and the diaphragm, the vibrations are suppressed by a sufficiently large spring force, and the crank with a small mass after the pin connection is loosely connected to the rod. can suppress vibrations in the crank system as a weak spring force between the rod and other cranks.

[Example] Hereinafter, the present invention will be explained based on Examples.

FIG. 1 shows a front view of a butterfly valve driving device as an embodiment of the present invention, and FIG. 2 shows a view from the arrow in FIG. A pin 3a for rotating a butterfly (not shown) provided on the tube is pivotally supported on the body 5 and fitted into a hole 3f of the crank 3,
A pin 3 is inserted into the hole 3e drilled at the other end of the crank 3.
b is fitted, and the pin 3b is loosely engaged with the groove 2b cut in the crank 2, whereby the cranks 2 and 3 form a rocking interlocking relationship through the pin connection.

A pin 2a fits into a hole 5a formed in the body 5, and the pin 2a fits into a hole 5a formed in the crank 2.
d, and between the perforation 2d of the crank 2 and the groove 2b, there is a pin 1 in the longitudinal direction of the crank 2.
A groove 2e having a groove width larger than the diameter of h is cut, and the pin 1h fitted into the rod 1f is fitted into the groove 2e with play in the axial direction of the rod 1f. , the rod 1f, and the crank 2 are in a loose interlocking relationship through the pin connection, and the wire-like spring 4 is wound around the pin 1h in the middle, and the branch part 4a of the spring 4 has one end wound around the pin 2a. The other end of the other branch 4b is fitted into the hole 2f drilled in the crank 2, and the branch 4b is
A spring force is always applied to the rod 1f to press the crank 2 toward the stopper 3c.

Rod 1f has one end attached to push plate 1.
The side plate 1c grips the outer periphery of the diaphragm 1d that is fitted into the push plate 1e and attached to the push plate 1e, and the diaphragm 1d and the side plate 1c form a displacement chamber 1b, and the connection hole 1a is connected to the displacement chamber 1b. The spring 1g always urges the push plate 1e toward the side plate 1c and the pin 1 of the rod 1f.
The side of the pin 1h allows swinging in the radial direction so that the center of the pin 1h can move along an arc 2c centered on the pin 2a, and the branch portion 4a serves as an elastic material to limit the swinging. There is.

The operation of the embodiment shown in FIG. 1 will be explained below.

When compressed air is not being fed to the connection hole 1a, as shown in FIG.
Press the push plate 1e until it comes into contact with the
This places rod 1f, cranks 2 and 3 in the position shown in FIG. 1, and pin 3a.
The butterfly in the exhaust pipe is in an open state.

In this state, the branch portion 4b of the spring 4
4 applies an auxiliary force to rotate the crank 2 in the counterclockwise direction around the pin 2a in FIG. 1 while applying a reaction force to the pin 1h. Explain using diagrams. In addition, FIG. 4 shows the pin 2a and the perforation 2d, and the pin 3a and the perforation 5 when the cranks 2 and 3 in FIG.
b, and is an explanatory diagram exaggerating the gap relationship between the pin 3b and the groove 2b, and shows the branch portion 4b.
The auxiliary force is shown replaced by the moment m1.

While the branch 4b is applying a reaction force to the pin 1h in this way, as shown in FIG. The moment m1 causes the crank 2 to exert a force m2 on the pin 3b and a force m3 on the pin 2a. As a result, groove 2b
is in contact with the pin 3b and the perforation 2d is in contact with the pin 2a, and the play caused by the gap between the groove 2b and the pin 3b and the play caused by the gap between the perforation 2d and the pin 2a are eliminated.

Furthermore, due to the force m2 acting on the pin 3b, the crank 3 abuts against the stopper 3c, and the pin 3a fixed to the crank 3 abuts against the borehole 5b with force f1. As a result, between the crank 3 and the stopper 3c, the pin 3a and the hole 5b
The gap between each space is eliminated,
There is no looseness in each connecting portion of the cranks 2 and 3.

In addition, in this FIG. 4, the pin 1h is in the groove 2e.
Although pin 1h is located far away from rod 1
In this state, the rod 1f is pressed toward the side plate 1c by the spring 1g as described above and is in a fixed state, and as will be described later, the pin 1h has a branch of the spring 4. A vibration isolator according to 4a is provided. Therefore, in this state, the pin 1h also does not wobble against the groove 2e.

When compressed air is forced into the connection hole 1a from the state shown in FIG. 1, the pressure of the compressed air pushes the diaphragm 1d downward in FIG.
As a result, the rod 1f rotates the crank 2 around the pin 2a through the pin 1h and the groove 2e, so the groove 2b rotates the crank 3 through the pin 3b.
is rotated around the pin 3a, and this rotation continues until the crank 3 comes into contact with the stopper 3d, as shown in FIG. 3, and the butterfly valve fixed to the pin 3a is closed and the exhaust brake is applied.

In addition, FIG. 3 shows the final position of the cranks 2 and 3 when compressed air is force-fed to the displacement chamber 1b as described above in FIG. 1, using the same front view as in FIG. 1. This is what is shown.

The action of the cranks 2 and 3 due to the compressed air being fed into the connection hole 1a will be explained in more detail using FIG. 5. In addition, Fig. 5 shows the 4th
In the figure, the relationships between the pin 2a and the perforation 2d, the pin 3a and the perforation 5b, and the pin 3b and the groove 2b when the pressing force of compressed air is applied from the rod 1f to the pin 1h are exaggerated. It is an explanatory diagram of the action being explained.

A force F1 shown in Fig. 5 is applied from rod 1f to pin 1h.
When , the pin 1h comes into contact with the groove 2e and pushes the crank 2 upward, so that the crank 2 applies a force M2 to the pin 2a and a force M1 to the pin 3b, while They touch each other.

At the same time, due to the force M1 being applied to the pin 3b, the crank 3 comes into contact with the stopper 3d,
In addition, the pin 3a fixed to the crank 3 has a force F2
It abuts against the perforation 5b while giving the same amount of force.

That is, in cranks 2 and 3, the joints between the pin 1h and the groove 2e, the pin 2a and the hole 2d, the pin 3a and the hole 5b, the pin 3b and the groove 2b, and the stopper 3d and the crank 3 are all free from play. It has become a state.

In the action of driving the butterfly valve as described above, when the butterfly valve is not driven (that is, the state shown in FIG. 1), the diaphragm 1d is moved between the side plate 1c and the push plate 1e by the biasing force of the spring 1g. The cranks 2 and 3 are restrained in a sandwich-like manner to prevent damage to the diaphragm itself due to vibration, and at this time, as described above, the cranks 2 and 3 are integrally restrained by the branch portion 4b of the spring 4, so the pin 2a , pins 1h, pins 3b and 3a do not vibrate with any play with each other, and abnormal wear of these parts does not occur even during long-term use.

Furthermore, in response to the above operation, when the butterfly valve is driven (the state shown in Fig. 3), each member from the rod 1f to the crank 3 is integrally pressed against the stopper 3d, as described above. Similarly, pins 1h, 2a, 3b and 3a
will not vibrate with any play between each member.

Also, at this time, since the diaphragm 1d is pressed toward the push plate 1e by the air pressure in the displacement chamber 1b, only the diaphragm 1d
There is no shaking relative to the side plate 1c or the push plate 1e, and the phenomenon that the diaphragm 1d is damaged due to vibration caused by the shaking does not occur.

Furthermore, since the center of the pin 1h is driven along an arc 2c drawn around the pin 2a, the rod 1f is able to swing in the radial direction of the rod. The rod 1f is easily swung in the radial direction. However, since the pins 1h and 2a fitted to the rod 1f have branch portions 4a, which are wire-like spring materials, fixed at both ends, the horizontal movement of the rod 1f is limited to the necessary range. In addition, the vibration is weakened by the cushioning action of the branch portion 4a, making it difficult for relative vibration to occur between the rod 1f or pin 1h and each member.

As a result, each member is prevented from being prematurely worn out due to the horizontal vibration.

What is particularly important in the above explanation is that the branch 4a
and 4b are each made of an integral spring 4, but the branch portions 4a and 4b have completely different characteristics.

As mentioned above, the branch 4a is "rod 1".
The branch portion 4b is an elastic material that limits the radial vibration of the crank 2, while the branch 4b provides a spring force so that the crank 2 is energized toward the displacement chamber 1b. ``This is to eliminate play between the pin 1h, groove 2e, crank 2, groove 2b, pin 3b, crank 3, and pin 3a.''

Therefore, the branch portion 4a and the branch portion 4b may originally be provided individually as separate bodies.

However, Fig. 1 shows this as one spring material 4
This shows that it can also be constructed integrally.

In the embodiment, the position of the pin 1h on the crank 2 is such that the lever ratio A/B between the distance A between the pin 2a and the pin 3b and the distance B between the pin 2a and the pin 1h is increased. ing.

This means that the large force generated on the diaphragm 1d can be controlled by the lever ratio of the crank 2.
This applies a small force to the pin 3b and expands the swing range of the pin 3b.

After all, this makes the biasing force of the spring 1g sufficiently strong so that the diaphragm 1d is sufficiently sandwiched between the push plate 1e and the side plate 1c when the displacement chamber 1b is not activated, and
When b is activated, sufficiently high pressure compressed air is forced into the displacement chamber 1b, and the diaphragm 1d is strongly pressed against the push plate 1e by the pressure.
This is to prevent vibration from occurring on the pin 3a, which is receiving high heat from the exhaust pipe, and to avoid applying a large force even though such a large force is generated on the rod 1f. be.

[Effects of the Invention] As is clear from the above description, the effects of the present invention are as follows.

(1) A; When the displacement chamber 1b is open to atmospheric pressure, the diaphragm 1d is moved to the push plate 1e by the force of the spring 1g.
Since the diaphragm 1d is clamped between the side plates 1c, if the spring biasing force is made sufficiently large, the diaphragm 1d will not vibrate due to the clamping force.

Conversely, when compressed air is being forced into the displacement chamber 1b, the pressure of the compressed air causes the diaphragm 1d to move toward the push plate 1.
Since it will be pressed toward the e side, if the compressed air pressure is made high enough at this time, the diaphragm 1d will not vibrate due to the pressing force.

(b); By configuring the crank 2 combined with the crank 3 for driving the pin 3a to be driven by the rod 1f, even if a large force is applied to the rod 1f as in (1) above, Pin 3a that is hot when driving the butterfly
Since a large force is not exerted on the pin 3a, the durability of the pin 3a can be improved.

C; Since the rod 1f is provided with an elastic member 4a that limits radial vibration, even if the exhaust pipe vibrates, the rod 1f will not be greatly vibrated in the radial direction due to the vibration. ing.

D; Since a spring force is applied to the crank 2 in the direction of the displacement chamber 1b, the rod 1f
Even if there is play between each pin connection between the crank 2 and the other crank 2, or between the crank 3 and the other crank 2, each pin connection will be in a state where the play is pressed to one side and the exhaust pipe Even if vibrations are applied to the drive device of the butterfly drool, the vibrations will not increase due to play in the drive system.

e; In particular, the side with a very large mass between the rod 1f and the diaphragm 1d suppresses vibration by the urging force of a sufficiently large spring 1g, and is fitted into the rod 1f and connected with the pin. The system of cranks 2 and 3 with small mass is the rod 1f and the other crank 2.
The vibration of the crank system can be suppressed by the force of the weak spring 4b between the two.

(2) In addition, in (1) above, when the wire spring 4a is used as the elastic material to prevent the rod 1f from rolling, it can be as simple as a wire spring. It is possible to prevent the rod 1f, which is in a suspended state, from shaking in the radial direction.

(3) In addition, when using the spring force applied to the crank 2 in the direction of the displacement chamber 1b in (1) above, when using a wire-like spring 4b, it is possible to use a simple structure such as a wire-like spring. This makes it possible to prevent vibrations caused by the backlash of the cranks 2 and 3.

(4) When both springs in (2) and (3) above are connected to one wire-like spring 4, only one spring is needed, and the assembly structure becomes simple.

[Brief explanation of drawings]

FIG. 1 shows a front view of a butterfly valve driving device as an embodiment of the present invention, FIG. 2 shows a view of the cranks 2 and 3 in FIG. 1, and FIG. shows another operating state with respect to the operating state of FIG. 1 with the same front view as in FIG. 1 around the cranks 2 and 3, and FIGS. An explanatory diagram is shown, and FIG. 6 shows a side sectional view of a conventional butterfly valve driving device. The main symbols used in the examples are as follows. 1: Actuator, 1b: Displacement chamber, 1
c: Side plate, 1d: Diaphragm, 1e: Push plate, 1f: Rod, 1g: Spring, 1
h: pin, 2 and 3: crank, 2a, 3a and 3b: pin, 2b and 2e: groove, 3c and 3d: stopper, 4: spring, 4a and 4b: branch, 5: body.

Claims (1)

[Claims] 1. A crank 3 that swings around the pin is fitted to the pin 3a that rotates the butterfly, and the other crank 2 is fitted to another pin 2a fitted to the body 5. , the other end of the other crank with respect to the other pin is in a rocking interlocking relationship by pin connection with a portion of the crank that is remote from the pin; The other crank and the rod 1f have a loose movement relationship with each other through another pin connection, and the other end of the rod with respect to the other pin connection part is connected to a diaphragm via a push plate 1e. 1d, the side plate 1c grips the outer periphery of the diaphragm and forms a stopper for the diaphragm in the axial direction of the rod, and the side plate and the diaphragm form a displacement chamber 1b; A biasing force of a spring 1g is applied to the rod toward the side of the displacement chamber, and an elastic member is provided on the rod to limit its radial vibration, and the rod is provided with an elastic material to limit vibration in the radial direction of the rod, and in the direction of the rocking of the crank, A stopper 3c that limits the swing angle on one side of the swing and another stopper that limits the swing angle on the other side of the swing are provided, and the other crank is provided with a stopper 3c that limits the swing angle on one side of the swing. A butterfly valve driving device characterized in that a spring is provided so that an end thereof is biased toward the displacement chamber. 2. The elastic material that limits the radial vibration of the rod 1f has a configuration in which one end of a wire-shaped spring material 4a is fixed to another pin 2a, and the other end of the spring material is fixed to the rod. A butterfly valve driving device according to claim 1. 3 The other end 2b of the other crank 2 is in the displacement chamber 1b
In the configuration in which a spring is provided in the other crank so as to be biased toward the other crank, one end of the wire-shaped other spring material 4b is fixed to the rod 1f, and the other end of the other spring material is attached to the other crank. 2. The butterfly valve driving device according to claim 1, wherein the butterfly valve is energized by a crank. 4. The elastic material that limits the radial vibration of the rod 1f is a wire-shaped spring material 4a with one end fixed to another pin 2a and the other end of the spring material fixed to the rod. In a configuration in which a spring is provided on the other crank so that the other end of the crank is biased toward the displacement chamber, one end of the wire-shaped other spring material 4b is fixed to the rod 1f, and the other spring is The other end of the spring material is energized by the other crank, and the wire-like spring and the other wire-like spring are formed by one common spring material wire 4. A butterfly valve driving device according to claim 1.