JPH11107790A - Exhaust brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong lives of a clevis and a lever so as to prolong a life of an exhaust brake device by arranging a shock absorbing member between the opposed parts of the tip parts of the lever and the clevis in a transmission system transmitting operation of an actuator to a valve element. SOLUTION: In an exhaust brake device 1 provided with a housing 2, a valve element 3 and an actuator 4, an exhaust brake action is produced when the valve element 3 prevents communication in an exhaust pipe arranged in front and in the rear of the housing 2. In the actuator 4, when a negative pressure is introduced into a pressure chamber A, a coil spring 17 is compressed by means of a differential pressure between the introduced negative pressure and an atmospheric pressure inside a pressure chamber B, so that a piston 12 and an operation rod 13 are moved to the lifting end position. In this way, a supporting shaft 5' is turned via a clevis 14 and a lever 6, and the exhaust pipe is closed by means of the valve element 3. In this case, a shock absorbing member 18 consisting of a metallic wave washer is arranged between the opposed parts of a tip part 14b of the clevis 14 and a tip part of the lever 6, and as a result, a life of the exhaust brake device 1 can be prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust brake device, and more particularly to an improvement in a connecting portion between a support shaft of a valve body and a clevis of an actuator.

[0002]

2. Description of the Related Art Conventionally, an exhaust brake device having the following configuration is known. That is, an annular housing provided in the middle of the exhaust pipe and constituting a part of the exhaust pipe, a valve element provided in the housing, and a support shaft connected to the valve element and protruding outside the housing. A lever connected to the support shaft, an operating rod that constitutes a part of the actuator and is moved forward and backward, and a clevis connected to an end of the operating rod, wherein the lever is interposed between the distal ends of the clevis. An exhaust brake device in which these two members are swingably connected is known. In such a conventional exhaust brake device, when the actuator is operated, the operating rod and the clevis provided thereon are moved, and the lever is rocked in conjunction with the clevis, whereby the support shaft is rotated. by this,
The valve body is rotated by a predetermined angle in the housing to close the exhaust passage.

[0003]

In the conventional exhaust brake device described above, the clevis and the lever connected to the tip of the clevis receive an impact when the actuator is operated, so that the tip of the clevis is broken. There was a drawback that it was easy. Heretofore, a type in which a coil spring for buffering is elastically provided between the end surface of the housing and the lever has been proposed, but in such a configuration, the coil spring is heated to a high temperature by the heat of the exhaust pipe. Therefore, there is a disadvantage that the original cushioning function of the coil spring is reduced.

[0004]

[Means for Solving the Problems] In view of such circumstances,
The present invention provides an annular housing provided in the exhaust pipe and constituting a part of the exhaust pipe, a valve element provided in the housing, and a support connected to the valve element and protruding outside the housing. A shaft, a lever connected to the support shaft, an operating rod which constitutes a part of the actuator and is moved forward and backward, and a clevis connected to an end of the operating rod, wherein the lever is located between the tip of the clevis. In an exhaust brake device in which both members are swingably connected to each other, a buffer member is provided between a portion of the exhaust brake device facing the lever and a tip portion of the clevis.

[0005]

According to this structure, since the cushioning member exists between the tip of the clevis and the lever, when the actuator is actuated and the operating rod is advanced or retracted, the tip of the clevis is moved by the cushioning member. And the impact acting on the lever can be reduced. Moreover, since the cushioning member is provided at a position that does not directly contact the exhaust pipe and the housing, the original cushioning function of the cushioning member does not decrease.
Therefore, the life of the clevis and the lever can be extended as compared with the conventional art, and the life of the exhaust brake device can be extended.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment. In FIG. 1, reference numeral 1 denotes an exhaust brake device. The exhaust brake device 1 includes an annular housing 2 provided in the middle of an exhaust pipe of a motor vehicle, a disc-shaped valve element 3 housed in the housing 2, and furthermore, the valve element 3 is disposed in a horizontal direction and a vertical direction. And an actuator 4 positioned at
The housing 2 constitutes a part of an exhaust pipe, and a disk-shaped valve body 3 is accommodated in the housing 2 in accordance with the inner diameter. As shown in FIG. 1, in a non-operation state in which the valve body 3 is horizontally supported, the exhaust pipes before and after the valve body 3 communicate with each other via the internal space of the housing 2. On the other hand, when the valve body 3 is rotated by the actuator 4 and supported vertically, the valve body 3 blocks communication in the exhaust pipes before and after the housing 2. Thereby, an exhaust braking action can be obtained. A pair of support shafts 5 and 5 ′ are connected to both sides of the valve body 3, and one of the support shafts 5 is rotatably fitted to a through hole on one side of the housing 2 while maintaining airtightness. I have. The other support shaft 5 ′ is made to pass through the through hole on the other side of the housing 2 while maintaining airtightness, and protrudes to the outside. A lever 6 is connected to the tip of the support shaft 5 'in a direction perpendicular to the axial direction. On the other hand, the actuator 4 is vertically connected to one end face of the housing 2 by a bracket 7. The inside of the casing 8 of the actuator 4 is divided into an upper first pressure chamber A and a lower second pressure chamber B by a diaphragm 11. A cup-shaped piston 12 is connected to the shaft of the diaphragm 11. ing. The upper end of the operating rod 13 is connected to the shaft of the piston 12. As shown in FIG. 2, the lower end of the operating rod 13 is projected outward below the casing 8.
The base of the clevis 14 is connected to the lower end of the operating rod 13. The distal end of the lever 6 on the valve body 3 side is interposed between the distal ends 14a and 14b of the clevis 14,
In this state, the connecting pin 15 is inserted through the through holes at the distal ends 14a and 14b of the clevis 14 and the distal end of the lever 6,
A split pin 16 is attached to the tip of the connecting pin 15. Thereby, the lever 6 and the clevis 14 are swingably connected. A coil spring 17 is elastically mounted in the first pressure chamber A of the actuator 4, thereby constantly biasing the piston 12 and the operating rod 13 downward, so that the first pressure chamber A and the second pressure chamber When the inside of B is at atmospheric pressure, the operating rod 13 is located at the non-operating position in the drawing due to the elasticity of the coil spring 17. In this non-operating state, the exhaust pipe is open because the valve body 3 is supported horizontally. On the other hand, when a negative pressure is introduced into the first pressure chamber A via a negative pressure source (not shown) and a switching valve, the negative pressure introduced into the first pressure chamber A and the negative pressure in the second pressure chamber B are increased. Coil spring 1 by differential pressure from atmospheric pressure
When the piston 7 is compressed, the piston 12 and the operating rod 13 connected thereto are moved to the raised end position. As a result, the support shaft 5 'is rotated by a predetermined amount via the clevis 14 and the lever 6, and the valve body 3 is supported in the vertical direction, so that the exhaust pipe is closed and an exhaust brake function can be obtained. When air is introduced into the first pressure chamber A from this operating state, the operating rod 13 returns to the non-operating state due to the resilience of the coil spring 17, so that the valve body 3 also returns to the horizontal state and the exhaust pipe Is open to the public. The above configuration is the same as that of the conventionally known exhaust brake device. Thus, as shown in FIG. 2 in an enlarged manner, in the present embodiment, an annular buffer member 18 is provided between the front end portion 14b of the clevis 14 and the opposing portion of the front end portion of the lever 6 opposed thereto. Things. The buffer member 18 is interposed between the distal end portion 14b and the lever 6 facing the distal end portion 14b while being fitted to the connecting pin 15. As shown in FIGS. 3 and 4, in the present embodiment, the buffer member 18 uses a wave washer made of metal. According to this embodiment, the clevis 1 is used.
Since the cushioning member 18 exists between the lever 4 and the lever 6, when the actuator 4 is actuated and the operating rod 13 is moved up and down, the cushioning member 18 causes the tip portion 14 of the clevis 14 to move.
a, 14b and the impact acting on the tip of the lever 6 can be reduced. Moreover, since the buffer member 18 does not directly contact the exhaust pipe and the housing 2, heat is less likely to be conducted to the buffer member 18.
8 is not overheated to a high temperature, and it is possible to prevent the original shock absorbing function of the cushioning member 18 from deteriorating. Therefore, as compared with the prior art, the tip portions 14a,
14b and the lever 6 are less likely to break, so that their life can be extended. As a result, the life of the exhaust brake device 1 can be extended. Further, the provision of the cushioning member 18 allows the clevis 14
Of the lever 6 provided between the front ends 14a and 14b of the housing 2 can be prevented from being displaced between the front ends 14a and 14b.
It can be prevented that the position shifts in the inside. (Second Embodiment) Next, FIGS. 5 and 6 show another embodiment relating to the cushioning member 18. FIG. In the second embodiment, the cushioning member 18 is formed by sandwiching rubber between a pair of plate-shaped metals and polymerizing them in a sandwich shape to be integrally formed. According to the second embodiment, the same operation and effect as those of the first embodiment can be obtained. (Third Embodiment) Next, FIGS. 7 and 8 show another embodiment of the present invention. In the third embodiment, a conical coil spring is used as the buffer member 18. According to the third embodiment, the same operation and effect as those of the first embodiment can be obtained.

[0007]

As described above, according to the present invention, the life of the clevis and the lever can be extended as compared with the conventional art, and the life of the exhaust brake device can be extended. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention.

FIG. 2 is a plan view of a main part of FIG. 1;

FIG. 3 is a front view of the cushioning member 18 shown in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a front view showing another embodiment of the present invention.

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5;

FIG. 7 is a front view showing another embodiment of the present invention.

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Exhaust brake device 2 Housing 3 Valve body 4 Actuator 5 Support shaft 5 'Support shaft 6 Lever 13 Operating rod 14 Clevis

Claims (4)

[Claims] 1. An annular housing provided in the exhaust pipe and constituting a part of the exhaust pipe, a valve body provided in the housing, and a valve body connected to the valve body and protruding outside the housing. A support shaft, a lever connected to the support shaft,
An actuating rod that constitutes a part of the actuator and that is moved forward and backward, and a clevis connected to the end of the actuating rod, the lever is interposed between the tips of the clevis, and both of these members can swing. An exhaust brake device according to claim 1, wherein a buffer member is provided between the lever and a portion of the clevis facing the tip of the clevis. 2. The lever and the tip of the clevis are swingably connected by a connecting pin inserted therethrough, and the buffer member is an annular wave washer fitted on the connecting pin. The exhaust brake device according to claim 1, wherein: 3. The lever and the tip of the clevis are swingably connected by a connecting pin inserted therethrough, and the buffer member is formed by polymerizing metal and rubber into an annular shape. The exhaust brake device according to claim 1, wherein the exhaust brake device is fitted to the connection pin. 4. The lever and the tip of the clevis are swingably connected by a connecting pin inserted therethrough, and the buffer member has a conical or cylindrical shape fitted to the connecting pin. The exhaust brake device according to claim 1, wherein the exhaust brake device is a coil spring.