JPH045872B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sliding type exhaust brake device that opens and closes an exhaust gas passage by sliding a valve.

"Prior Art" Conventionally, a sliding exhaust brake device includes a valve body with an exhaust gas passage formed therein, a valve housed inside the valve body so as to be able to reciprocate in a direction intersecting the exhaust gas passage, and a valve body that is arranged outside the valve body. an actuator provided in the valve body; and a rod slidably inserted into a through hole bored in the valve body and having one end connected to the valve and the other end connected to the actuator; A device is known that is movable between a closed position where it is located on the exhaust gas passage and closes the exhaust gas passage, and an open position where it is removed from the exhaust gas passage and opens the exhaust gas passage.

``Problems to be Solved by the Invention'' By the way, since the slide type exhaust brake device is installed in the middle of the exhaust pipe of a vehicle, the entire device is often subject to vibration, and moreover, it is subject to the effects of heat conducted from the exhaust pipe. In addition, when installing a slide type exhaust brake device to an exhaust pipe, it is desired that the installation space be as small as possible.

However, in the conventional sliding exhaust brake device described above, the actuator is disposed adjacent to the valve in the open position, that is, the valve in the open position and the valve in the open position are sequentially moved outward in the radial direction around the exhaust gas passage. Since the actuator is arranged, the amount of protrusion of the actuator with respect to the exhaust pipe becomes large.

Therefore, when installing the sliding exhaust brake device on a vehicle, it may be difficult to secure the installation space, and the weight balance may be poor, causing the sliding exhaust brake device and the exhaust pipe to The disadvantage was that the connecting parts of the parts were easily damaged. Furthermore, since heat from the exhaust pipe is conducted to the actuator side through the rod, it has conventionally been necessary to provide an expensive sealing member with excellent heat resistance between the actuator side case and the rod.

"Means for Solving the Problems" In view of the above-mentioned circumstances, the present invention provides the above-mentioned slide type exhaust brake device in which the valve in the open position and the actuator are arranged at opposing positions across the exhaust gas passage. The actuator is further provided with a case in which one end of the rod that is attached to the valve body and protrudes from the valve body is loosely fitted therein, and a rod that is provided so as to be able to reciprocate within the case and is loosely fitted in the case. A movable bulkhead connected to one end to divide the inside of the case into two; and a space between the outer periphery of the rod and the case on the side closer to the valve body of the space inside the case divided by the movable bulkhead. an atmospheric chamber that communicates with the atmosphere through a spacer, a negative pressure chamber that is a space in the case located on the opposite side of the atmospheric chamber and into which negative pressure is introduced when necessary, and a movable partition wall that faces the valve body. It consists of a spring that is biased to position the valve in the open position via the rod.

"Operation" According to such a configuration, first of all, the valve in the open position and the actuator are disposed at opposite positions across the exhaust gas passage, and the valve is in the open position when the actuator is not operated. Compared to conventional devices in which both actuators are located on one side of the exhaust gas passage, the amount of protrusion of the actuator relative to the exhaust pipe can be kept to a minimum. This makes it easier to secure mounting space when installing the exhaust pipe.

Secondly, with the above configuration, the weight balance on both sides centering on the exhaust gas passage can be made good for the same reason.

Furthermore, thirdly, the space inside the actuator case on the valve body side is an atmospheric chamber, and this atmospheric chamber communicates with the atmosphere through a gap between the outer periphery of the rod and the case. There is no need to provide an expensive sealing member with excellent heat resistance between the outer circumferential portion of the rod and the case as in the case of the present invention, and the cost can therefore be reduced accordingly.

"Example" The present invention will be described below with reference to the illustrated example.
1 and 2, reference numeral 1 denotes a valve body installed in the middle of an exhaust pipe (not shown), and this valve body 1 forms an exhaust gas passage 2 through which exhaust gas flowing in the exhaust pipe passes, and this exhaust gas passage A valve storage chamber 4 for storing a valve 3 is formed perpendicularly to the valve 2. The valve 3 is
It is capable of reciprocating along the sliding surface 4a of the storage chamber 4 on the downstream side with respect to the exhaust gas flow direction shown by the arrow in FIG. The exhaust brake action is performed by closing the passage 2, and in the open position away from the exhaust gas passage 2 (the state shown in Figures 1 and 2), the exhaust gas is allowed to flow freely and the exhaust brake action is released. .

However, by arranging the actuator 5 on the opposite side of the valve 3 in the open position with respect to the exhaust gas passage 2, the exhaust gas passage becomes smaller than when both are arranged in the same direction from the exhaust gas passage 2. 2. That is, the amount of protrusion of the actuator 5 relative to the exhaust pipe is made as small as possible, and the weight balance on both sides of the exhaust pipe is maintained at a good level.

The actuator 5 has a pair of cases 6 and 7, and one case 6 is connected to a heat insulating plate 8 and a bracket 9 with a bolt nut 10, and the bracket 9 is connected to the valve body 1 with a bolt 11.
The valve body 1 and actuator 5 are interconnected by being connected to each other. At this time, the bracket 9 also serves as a lid for closing the opening of the valve storage chamber 4.

Further, the actuator 5 has a power piston 12 in its cases 6 and 7, and the power piston 1.
Piston rod 13 integrally connected to the shaft portion of 2
and a diaphragm that partitions the inside of the cases 6 and 7 into a negative pressure chamber 14 and an atmospheric pressure chamber 15,
The negative pressure chamber 14 communicates with a negative pressure source via a negative pressure inlet 17 and a solenoid valve (not shown), and also communicates with an atmospheric pressure chamber 15.
communicates with the atmosphere through an air hole 18 formed in the shaft of the case 6.

The tip of the piston rod 13 connected to the power piston 12 loosely fits through the air hole 18 and protrudes to the outside, and also loosely fits through the heat insulating plate 8. One end of a drive rod 19 is loosely fitted to the tip of the power piston 12, and the two are connected by a pin 20, and the other end of the drive rod 19 slidably passes through a cylindrical bearing 21 provided on the bracket 9. The valve body 1 is made to protrude into the valve body 1, and the above-mentioned valve 3 is connected to its protruding end.

A compression spring 22 is provided in the negative pressure chamber 14 of the actuator 5, and when the actuator 5 is not in operation, the spring 22
The elastic force causes the power piston 12 and piston rod 13 to move leftward together, and the tip of the piston rod 13 comes into contact with the end face of the bearing 21 to restrict further leftward movement. Exhaust gas attempting to leak from the gap between the inner circumferential surface of the drive rod 19 and the outer circumferential surface of the drive rod 19 is blocked. On the other hand, when negative pressure is introduced into the negative pressure chamber 14, the stopper portion 23 provided on the valve 3 side of the drive rod 19 is moved against the bearing 21.
By contacting the end face of the piston 12, the rightward movement of the power piston 12 and the like is restricted, and at the same time, the gap can be closed.

In the above configuration, during non-operation when negative pressure is not introduced into the negative pressure chamber 14, the power piston 12,
The piston rod 13, drive rod 19, valve 3, etc. are held in the illustrated positions by springs 22,
Exhaust gas flows freely within the exhaust gas passage 2.
During this time, the above-mentioned gap is the piston rod 1.
3 and the bearing 21, the exhaust gas will not leak outside. Further, the heat of the exhaust gas is transferred to the piston rod 13 via the drive rod 19, but since the two are loosely fitted and connected by the pin 20, the transfer of heat can be suppressed. In addition, since the chamber on the valve body 1 side of the actuator 5 is opened to the atmosphere as an atmospheric pressure chamber 15, an expensive seal with excellent heat resistance is required between the piston rod 13 and the case 6 as if this were to be used as a pressure chamber. There is no need to provide any members.

On the other hand, when negative pressure is introduced into the negative pressure chamber 14 and the power piston 12, valve 3, etc. are operated against the spring 22, the valve 3 is located above the exhaust gas passage 2 and The passage is blocked and the exhaust brake is applied. Even in this state, the stopper portion 23 of the drive rod 19 contacts the bearing 21 and closes the gap between the drive rod 19 and the bearing 21, so that exhaust gas can be prevented from leaking from the gap.

[Effects of the Invention] As described above, according to the present invention, it is possible to easily secure an installation space when attaching a sliding exhaust brake device to an exhaust pipe. Further, it is possible to achieve the effect that the weight balance on both sides centering on the exhaust gas passage can be made good. Furthermore, there is no need to provide an expensive sealing member with excellent heat resistance between the outer periphery of the rod and the case as in the past, and the cost can therefore be reduced accordingly. .

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
The figure is a sectional view taken along the - line in FIG. 1. 1... Valve body, 2... Exhaust gas passage, 3... Valve, 5... Actuator, 6, 7... Case, 12
...Power piston (movable bulkhead), 16...Diaphragm (movable bulkhead), 14...Negative pressure chamber, 15...Atmospheric chamber,
13... Piston rod (rod), 19... Drive rod (rod), 22... Spring.

Claims (1)

[Scope of Claims] 1. A valve body forming an exhaust gas passage, a valve housed inside the valve body so as to be able to reciprocate in a direction intersecting the exhaust gas passage, an actuator provided outside the valve body, and the above valve body. a rod that is slidably passed through a through hole formed in a valve body, and has one end connected to the valve and the other end connected to an actuator, and the actuator positions the valve on the exhaust gas passage. In the slide type exhaust brake device, the valve and the actuator in the open position are moved to a closed position where the exhaust gas passage is closed by moving the valve and the actuator to a closed position where the exhaust gas passage is closed by moving the valve and the actuator from the exhaust gas passage. The actuator is disposed at opposing positions across a gas passage, and further includes a case in which the actuator is loosely fitted with one end of the rod that is attached to the valve body and protrudes from the valve body, and is provided so as to be able to reciprocate within the case. and a movable bulkhead connected to one end of the rod loosely fitted in the case to partition the inside of the case into two; and a space in the case divided by the movable bulkhead on the side closer to the valve body. Between the outer periphery of the above rod and the case〓
an atmospheric chamber that communicates with the atmosphere through the atmospheric chamber, a negative pressure chamber that is a space inside the case located on the opposite side of the atmospheric chamber and into which negative pressure is introduced when necessary, and the movable partition wall that is attached toward the valve body. A slide type exhaust brake device comprising: a spring which biases the valve to an open position via the rod.