JP2001207870A - Valve device used for exhaust brake system and warming- up system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining structure of a housing and a bracket of an actuator of a valve device used for a vehicular exhaust brake system and a warming-up system, having a simple structure, capable of reducing the number of part items, being excellent in assembling performance and capable of reducing a cost. SOLUTION: A cylindrical part 35d is arranged in a peripheral edge part of a hole 35c for penetrating an output rod 37 of the actuator 36 formed on the bracket 35 of the valve device 31. The cylindrical part 35d is formed in a peripheral edge part of a central hole 42b arranged in a shell 42 of the actuator 36 so as to be rolled in over the outside surface side from the inside surface side. The bracket 35 and the shell 42 of the actuator 36 are integrally joined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust brake system for operating an exhaust brake by closing an exhaust passage of exhaust gas discharged from an engine of an automobile or the like, or similarly closing an exhaust passage of exhaust gas. The present invention relates to a valve device used in a warming system that promotes warm air.

[0002]

2. Description of the Related Art FIG. 5 is a front sectional view showing an example of a valve device used in a conventional exhaust brake system or warm-up system, and FIG. 6 is a side view showing a part of the valve device. This valve device 1 has a cylindrical valve housing 2 provided in the middle of an exhaust pipe of an engine (not shown).
A butterfly valve type valve element 4 is attached to a valve shaft 3 rotatably supported by the valve housing 2.

An actuator 6 is mounted on the valve housing 2 via a bracket 5, and the supply and discharge of fluid pressure to and from the actuator 6 are performed by the operation of an electromagnetic switching valve (not shown).
By operating the output rod 7, the valve body 4 is rotated via the lever 8 attached to the outer end of the valve shaft 3, and the exhaust pipe of the engine is opened and closed. The bracket 5 is attached to the valve housing 2 with a plurality of bolts 9. Actuator 6
The housing 10 comprises an upper shell 11 and a lower shell 12
The nut 5 is fastened to a plurality of bolts 13 welded and fixed to the lower shell 12 so that the bracket 5
Is connected to the lower shell 12.

A power piston 15 connected to the other end of the output rod 7 protruding from the center hole of the lower shell 12 is disposed in the housing 10 of the actuator 6. The power piston 15 is composed of a piston plate 16 and a diaphragm 17, and the power piston 15 is coupled to the output rod 7 by radially engaging the central cylindrical portion of the retainer 18 with the annular groove on the outer periphery of the output rod 7. are doing. Reference numeral 19 denotes an O-ring for maintaining airtightness between the output rod 7 and the power piston 15. The interior of the housing 10 is partitioned into an atmosphere chamber 20 that is always in communication with the atmosphere by the power piston 15 and a vacuum chamber 21 connected to an electromagnetic switching valve (not shown) via a pipe 22 provided in the upper shell 11. The chamber 21 is communicated with the atmosphere when not operated, and is supplied with vacuum when an electromagnetic switching valve (not shown) is operated during operation. In the non-operating state, the power piston 15 is held at the position shown in the figure by the return spring 23.

A clevis 24 is attached to the tip of the output rod 7.
Is mounted, and is connected by pins 25 to a lever 8 fixed to a distal end portion of the valve shaft 3 to which the valve element 4 is fixed by a nut or the like. Further, two stopper bolts 26 are respectively screwed and fixed to two screw portions provided on the bracket 5, and the lever 8 comes into contact with the stopper bolts 26 when the lever 8 is not operated and when it is operated, so that the valve The inoperative position and the operating position of the body 4 are regulated. Therefore, by adjusting the screwing of the stopper bolt 26, the position of the valve body 4 at the time of non-operation or at the time of operation can be adjusted. In addition,
The opening of the substantially box-shaped bracket 5 is covered with a cover 27 fixed to the bracket 5 with a plurality of bolts, so that foreign matter such as dust does not enter the connecting portion between the output rod 7 and the lever 8. .

[0006]

By the way, in the case of the above-mentioned conventional valve device 1, since the bracket 5 and the lower shell 12 are connected by using a plurality of bolts 13 and nuts 14 as described above. In addition, there are many parts for connection, welding of bolts and tightening of nuts are required, and the structure is complicated, assembly is poor, and the cost is high. Therefore, the lower shell 12 is swaged using bolts 13 and nuts 14, or by welding or rivets.
It has been proposed to couple directly to the bracket 5,
The connection by caulking, welding, rivets or the like cannot secure sufficient durability and strength against the vibration from the engine and the operating force when the actuator 6 is operated.

Further, as described above, the power piston 15
Are fixed to the output rod 7 by caulking the central cylindrical portion of the retainer 18 in the radial direction and engaging the outer peripheral groove of the output rod 7, and the O-ring 19 for maintaining the airtightness with the output rod 7. , The structure is complicated, the number of parts is large, and the assemblability is poor. Further, in this structure, the O-ring 19 may not be sufficiently pressed by the retainer 18 and the airtightness between the power piston 15 and the output rod 7 may not be sufficiently maintained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional drawbacks, and has as its object to maintain sufficient durability and strength against vibration from an engine and operating force of an actuator and to have a structure. It is easy and can reduce the number of parts.
An object of the present invention is to provide a coupling structure of a housing and a bracket of an actuator of a valve device used in an exhaust brake system or a warm-up system which can be easily assembled and can reduce costs.

Another object of the present invention is to provide an exhaust brake system and a warm air system which have a simple structure, can reduce the number of parts, are easy to assemble, can reduce costs, and can more reliably maintain the airtightness between the power piston and the output rod. An object of the present invention is to provide an assembly structure of a power piston and an output rod of an actuator of a valve device used in the system.

[0010]

To achieve the above object, according to the present invention, there is provided a valve housing disposed in an exhaust passage of exhaust gas discharged from an engine, and a valve housing provided in the valve housing. A valve having a valve body movably supported by a valve shaft and an actuator attached to the valve housing via a bracket, and actuating the actuator to rotate the valve body to close the exhaust passage; In the apparatus, a cylindrical portion is provided at a peripheral portion of a hole formed on an actuator mounting surface of the bracket and through which an output rod of the actuator passes, and a peripheral portion of the hole through which the output rod of the housing of the actuator penetrates the cylindrical portion. The bracket and the housing are integrally formed so as to be wound from the inner surface side to the outer surface side of the part. It is characterized by combined.

Further, the present invention according to claim 2 is characterized in that the cylindrical portion of the bracket is formed in a tapered shape expanding in a direction away from the actuator mounting surface.

Further, according to a third aspect of the present invention, the actuator further includes a movably provided power piston that partitions the inside of the housing into an atmosphere chamber and a transformer chamber.
The power piston includes at least a piston plate and a diaphragm provided with an airtight holding portion on an inner peripheral portion, forms a flange portion and a caulking portion on the output rod, and caulks the caulking portion to form the piston plate and the piston plate. The airtight holding portion of the diaphragm is pressed and sandwiched by the flange portion in the axial direction to integrally connect the power piston and the output rod, and to maintain the airtightness between the power piston and the output rod. And

[0013]

According to the above construction, the peripheral portion of the hole through which the output rod of the actuator housing penetrates is formed so as to be wound from the inner surface side to the outer surface side of the cylindrical portion provided on the bracket, and the bracket and the actuator are formed. Since the housing is integrally connected, the bracket and the housing of the actuator can be connected while maintaining sufficient strength, and sufficient durability and strength against vibration from the engine and operating force of the actuator can be obtained. Will be able to do it.

Further, the strength of the connection between the bracket and the housing of the actuator can be further increased by making the shape of the cylindrical portion provided on the bracket into a tapered shape in which the diameter increases in a direction away from the actuator mounting surface. Therefore, durability and strength against engine vibration and actuator operating force can be further increased.

Further, an airtight holding portion is provided on the inner peripheral portion of the diaphragm constituting the power piston of the actuator, and the airtight holding portion is pressed and held in the axial direction by the flange portion and the caulking portion of the output rod together with the piston plate. As a result, the airtight holding portion of the diaphragm is more reliably pressed, and airtightness between the power piston and the output rod can be more reliably maintained.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a valve device according to an embodiment of the present invention will be described. FIG. 1 is a partial cross-sectional view showing an actuator of a valve device used in an exhaust brake system to which a first embodiment of a valve device according to the present invention is applied. FIG. FIG. 3 is a partial cross-sectional view showing a part cut away.

As shown in FIGS. 1 and 2, in a valve device 31 of the first embodiment, a valve housing 32 is disposed in a discharge passage of exhaust gas discharged from an engine, and is supported by the valve housing 32. A butterfly valve type valve element 34 is fixed to the valve shaft 33. As will be described later, a bracket 35 integrally connected to a lower shell 42 which is a part of the housing of the actuator 36 is attached to the valve housing 32 by bolts 39.

The bracket 35 has a box shape open in two directions, and is formed at right angles to a mounting portion 35a to the valve housing 32.
b, the output rod 3 of the actuator 36
A hole 35c through which the hole 7 penetrates is provided, and a tapered cylindrical portion 35d whose diameter increases in the radial direction as the distance from the mounting portion 35b increases is provided at a peripheral portion of the hole 35c. Note that the cylindrical portion 35d of the bracket 35 may be simply formed in a cylindrical shape without being formed in a tapered shape.

As shown in FIG. 1, the housing 40 of the actuator 36 is composed of an upper shell 41 and a lower shell 42, and the lower shell 42 is attached to the bracket 35 in contact with the attachment 35b of the bracket 35. A central hole 42b, through which the output rod 37 penetrates, is formed substantially at the center of the central hole 42a, and the tapered cylindrical portion 35d of the bracket 35 is closely attached to the peripheral edge of the central hole 42b so as to be wound from the inner surface to the outer surface. The engaging winding portion 42c is formed. In this way, for example, in a state in which the mounting portion 42a of the lower shell 42 is in close contact with the mounting portion 35b of the bracket 35 by press-welding or the like, the winding portion 42c is closely in contact with the tapered cylindrical portion 35d, and is formed by winding. Since the lower shell 42 and the bracket 35 are integrally connected, the bracket 35
The lower shell 42 and the lower shell 42 can be coupled while maintaining sufficient strength, and sufficient durability and strength can be obtained with respect to vibration of the engine and operating force of the actuator. Furthermore, bolts and nuts are not required as compared with the conventional one, so that the number of parts can be reduced and the structure can be simplified, and bolt welding and nut tightening work, etc. become unnecessary, and assemblability is improved.
The cost can be reduced.

A power piston 45, which divides the inside of the housing 40 of the actuator 36 into an atmosphere chamber 50 and a vacuum chamber 51 and is movably provided in the housing 40,
A bottomed and substantially cylindrical piston plate 46 having a central hole, a retainer 48, and a diaphragm 47 are provided. An O-ring-shaped airtight holding portion 47a is provided on the inner diameter of the diaphragm 47. The plate 46 has an airtight holding portion 4 of a diaphragm 47 at an inner diameter portion.
An annular concave portion 46a where the reference numeral 7a is located is provided, and an annular projecting portion 46b is provided substantially at the center of the flat portion on the outer peripheral side of the concave portion 46a. The annular projection 46b prevents the piston plate 46 from being deformed when a vacuum is supplied to the vacuum chamber 51. Also,
An annular concave portion 48 a in which the airtight holding portion 47 a of the diaphragm 47 is located is provided in the inner diameter portion of the retainer 48. In addition, both the piston plate 46 and the retainer 48 are provided with annular concave portions where the airtight holding portions 47a of the diaphragm 47 are located, but may be provided only on one of them.

At the end of the output rod 37 on the power piston side, a flange 37a and a cylindrical portion 37 having a diameter smaller than the outer diameter of the flange are provided.
b and a caulking portion 37c smaller in diameter than the cylindrical portion 37b
Are formed. Then, the cylindrical portion 3 of the output rod 37
After the retainer 48, the diaphragm 47, and the piston plate 46 are fitted into 7b and the collar 58 is fitted into the caulking portion 37c, the tip of the caulking portion 37c is caulked and deformed to fix the power piston 45 to the output rod 37. ing. At this time, since the retainer 48, the airtight holding portion 47 a of the diaphragm 47, and the inner diameter portion of the piston plate 46 are pressed and sandwiched in the axial direction by the collar portion 37 a of the output rod 37 and the collar 58, the airtightness of the inner diameter portion of the diaphragm 47 is maintained. The portion 47a is housed in the recesses 46a, 48a of the piston plate 46 and the retainer 48 and is pressed and sandwiched in the axial direction.
7 is pressed against the outer peripheral surface of the cylindrical portion 37b, and the output rod 37
The airtightness between the power piston 45 and the power piston 45 is reliably maintained, and the power piston 45 is securely fixed to the output rod 37.

A clevis portion 38a is formed on the lever 38 fixed to the distal end portion of the valve shaft 33 by screwing, and a flat portion 37d formed on the distal end side of the output rod 37 is fitted to the clevis portion 38a. Are connected by a pin 55. The lever 38 is provided with a stopper 38b for regulating the non-operating position and a stopper 38c for regulating the operating position. In the non-operating state, the vacuum chamber 51 of the actuator 36 is provided with a pipe 52 provided in the upper shell 41. Is connected to the atmosphere through an electromagnetic switching valve (not shown) connected via the power rod 45. The output rod 3 is biased by a return spring 53 which biases the power piston 45 downward in the drawing.
7 and the stopper 38b is
5 is held at the position shown in FIG.

In operation, when an electromagnetic switching valve (not shown) is operated and a vacuum is supplied to the vacuum chamber 51 via the pipe 52, the power piston 45 is moved by the pressure difference between the vacuum chamber 51 and the atmosphere chamber 50 as shown in FIG. Stroke upward with. Thereby,
The lever 38 is connected to the stopper 38 via the output rod 37.
c rotates to a position where it comes into contact with a tip end surface of a stopper bolt 56 screwed and fixed to a nut fixed to the bracket 35 by welding or the like. Accordingly, the valve body 34 fixed to the valve shaft 33 rotates to close the exhaust passage hole in the valve housing 32, and the exhaust brake operates.

The stopper bolt 56 provided on the bracket 35 is screwed into the screw portion provided on the bracket 35 from the outside opposite to the inside where the lever 38 and the like of the bracket 35 are arranged. The operating position of the lever 38 can be adjusted by rotating the hexagonal head of the stopper bolt 56 located at the position shown in FIG. Therefore, the clearance between the valve body 34 and the inner peripheral surface of the exhaust passage hole of the valve housing 32 at the time of operation is adjusted by the bracket 35
The adjustment can be performed by rotating the hexagonal head of the stopper bolt 56 located on the outside of the stopper bolt, so that the valve clearance adjustment operation can be easily performed.

In order to prevent dust and the like from entering into movable parts such as the valve shaft 33, the output rod 37, and the lever 38 disposed in the box-shaped bracket 35, two open directions of the bracket 35 are shielded. Cover 57 to be mounted on the bracket 3
5 has a two-sided box shape having two shielding surfaces for shielding the two-way openings and two side surfaces fitted with the outer surface of the side wall surface of the bracket 35. Stopper bolt 5 arranged on the side wall surface of bracket 35 on the side surface of cover 57
6 is provided so as to accommodate the hexagonal head of the bracket 6, and when the cover 57 is fitted and fixed to the bracket 35, the projection 5a is provided.
7a covers the hexagonal head of the stopper bolt 56 so that the hexagonal head is not exposed to the outside. This allows the driver or the like to turn the hexagonal head of the stopper bolt 56 indiscriminately to change the clearance between the valve body 34 and the inner peripheral surface of the exhaust passage hole of the valve housing 32 during operation, thereby improving the performance of the exhaust brake device. It is possible to prevent problems such as deterioration and deterioration of the engine by increasing the load on the engine.

At the side of the cover 57, two engaging claws 57b inclined inward are provided. When the cover 57 is fitted to the bracket 35, two engaging recesses provided on the side of the bracket 35 are provided. The cover 57 is fitted and fixed to the bracket 35 by tightening a bolt 60 to one screw portion provided on the bracket 35 in this state. Therefore, the cover 57
Can be securely fixed to the bracket 35, and the number of parts such as bolts can be reduced and the cover mounting work can be facilitated as compared with the conventional case where the cover is fixed to the bracket by tightening a plurality of bolts.

FIG. 3 is a sectional view similar to FIG. 1, showing a second embodiment of the present invention. In the following description of each example, the same components as those of the example described before the same example are denoted by the same reference numerals, and detailed description thereof will be omitted.

The second embodiment differs from the first embodiment only in the connection structure between the power piston 45 and the output rod 37. In the first example, a retainer 48, a diaphragm 47, and a piston plate 46 are provided on the cylindrical portion 37b of the output rod 37.
The collar 58 is inserted into the caulking portion 37c provided at the end of the output rod 37, and the caulking portion 37c is caulked and deformed, so that the collar portion 37a of the output rod 37 and the caulking deformed portion of the caulking portion 37c are formed. Between the retainer 48, the diaphragm 47, and the piston plate 4 via the collar 58.
6 is pressed in the axial direction to hold it, but in the second example, the collar 58 is deleted, and the caulking portion 37c provided at the end of the output rod 37 is caulked and deformed to form the caulking portion 3.
7c, the piston plate 46 is directly pressed, and the flange portion 37a of the output rod 37 and the caulking portion 37c hold the retainer 48,
The diaphragm 47 and the piston plate 46 are pressed in the axial direction to be sandwiched. According to the second example, the number of parts can be further reduced since the collar is eliminated from the first example, so that the structure can be simplified and the cost can be further reduced. The other configuration of the second example is the same as that of the first example, and the second example can provide the same operation and effect as the first example.

FIG. 4 is a sectional view similar to FIG. 1, showing a third embodiment of the present invention. The third example is different from the first example only in the structure of coupling the power piston 45 and the output rod 37. In the third example, a collar portion 37a is formed at the tip of the output rod 37 on the power piston side,
On the lower side, a piston plate 46, a diaphragm 47,
A cylindrical portion 37b into which the retainer 48 is inserted is formed, and a caulking portion 37c is provided at an end of the cylindrical portion 37b opposite to the flange 37a. The piston plate 46 and the diaphragm 4 are attached to the cylindrical portion 37b of the output rod 37.
7. The retainer 48 is inserted from the side opposite to that of the first example, and the caulking portion 37c is caulked and deformed, and the caulking portion 37c is pressed in the axial direction, and the flange portion 37 of the output rod 37 is pressed.
The piston plate 46, the diaphragm 47, and the retainer 48 are pressed in the axial direction by the a and the caulking portion 37c to be sandwiched.

In the third example, since the positions of the flange 37a and the caulking part 37c of the output rod 37 are reversed with respect to the first example, a vacuum is supplied to the vacuum chamber 51 and the power piston 45 is moved. When the power piston 45 operates, the action force of the power piston 45 acts on the flange portion 37a, so that the strength of the joint between the power piston 45 and the output rod 37 is further improved, and the collar 58 is omitted.
The number of parts is reduced, so that the structure can be simplified and the cost can be further reduced. Other configurations of this third example are:
This is the same as the first example, and the third example can provide the same operation and effect as the first example.

Although the present invention has been described with respect to the valve device used in the exhaust brake system as described above,
The present invention can also be applied to a valve device used in a warm-up system that promotes warm-up by closing an exhaust pipe of an engine.

[0032]

As is apparent from the above description, according to the present invention, a cylindrical portion is provided at the periphery of the hole through which the output rod of the actuator formed on the actuator mounting surface of the bracket passes, and Since the peripheral edge of the hole through which the output rod of the housing penetrates is formed so as to be wound from the inner surface side to the outer surface side of the cylindrical portion and the bracket and the housing are integrally connected, the bracket and the housing of the actuator are combined. Can be combined while maintaining sufficient strength, and sufficient durability and strength against engine vibration and actuator operating force can be obtained. In addition, bolts and nuts are not required, the number of parts can be reduced, the structure can be simplified, and bolt welding and nut tightening work are not required, improving the assemblability and reducing costs. I can plan.

Since the cylindrical portion of the bracket is formed in a tapered shape in which the diameter is increased in a direction away from the actuator mounting surface, the strength of the connection between the bracket and the housing of the actuator can be further increased, and the vibration of the engine can be increased. And more sufficient durability and strength against the operating force of the actuator.

Further, the power piston of the actuator is constituted by at least a piston plate and a diaphragm provided with an airtight holding portion on an inner peripheral portion, a flange portion and a caulking portion are formed on the output rod, and the caulking portion is caulked. The piston plate and the airtight holding portion of the diaphragm are axially pressed and sandwiched between the flange portion and the flange portion to integrally connect the power piston and the output rod, and the airtightness between the power piston and the output rod is reduced. Since the holding is performed, the structure is simple, the number of parts can be reduced, the assemblability is good, the cost can be reduced, and the airtightness between the power piston and the output rod can be more reliably maintained.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of an actuator of a valve device used in an exhaust brake system according to an embodiment of the present invention, which is cut away.

FIG. 2 is a partial cross-sectional view showing a valve portion of FIG.

FIG. 3 is a partial sectional view similar to FIG. 1, showing a second example of the valve device according to the embodiment of the present invention;

FIG. 4 is a partial cross-sectional view similar to FIG. 1, showing a third example of the valve device according to the embodiment of the present invention;

FIG. 5 is a front sectional view showing an example of a valve device used in a conventional exhaust brake system or warm-up system.

FIG. 6 is a side view in which a part of FIG. 5 is cut away.

[Explanation of symbols]

 32 valve housing 33 valve shaft 34 valve body 35 bracket 35b mounting part 35c hole 35d cylindrical part 37 output rod 37a flange part 37b cylindrical part 37c swaging part 38 lever 41 upper shell 42 lower shell 42b central hole 42c winding part 45 power piston 46 Piston plate 46a Annular concave part 47 Diaphragm 47a Airtight holding part 48 Retainer 48a Annular concave part 50 Atmosphere chamber 51 Vacuum chamber 57 Cover 57a Projection 57b Engagement claw 58 Collar

Claims (4)

[Claims] 1. A valve housing disposed in an exhaust passage of exhaust gas discharged from an engine, a valve body rotatably supported in the valve housing by a valve shaft, and a bracket mounted on the valve housing. And an actuator mounted via the bracket, wherein the output rod of the actuator formed on the actuator mounting surface of the bracket is provided in a valve device for closing the exhaust passage by rotating the valve body by the operation of the actuator. A cylindrical portion is provided at a peripheral portion of the through-hole, and the peripheral portion of the hole through which the output rod of the housing of the actuator passes is formed so as to be wound from the inner side to the outer side of the cylindrical portion. And a housing integrated with the housing. 2. The valve device according to claim 1, wherein the cylindrical portion of the bracket is formed in a tapered shape whose diameter increases in a direction away from the actuator mounting surface. 3. The actuator further comprises a movably provided power piston for partitioning the inside of the housing into an atmosphere chamber and a variable pressure chamber, and the power piston has an airtight holding portion at least on a piston plate and an inner peripheral portion. A flange portion and a caulking portion are formed on the output rod, and the caulking portion is caulked to press and hold the piston plate and the airtight holding portion of the diaphragm in the axial direction with the flange portion. The valve device according to claim 1 or 2, wherein the power piston and the output rod are integrally connected to each other, and airtightness between the power piston and the output rod is maintained. 4. The valve device according to claim 1, wherein the valve device is a valve device used for an exhaust brake system or a warm-up system for a vehicle.
The valve device according to claim 1.