JPH0318670Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is applicable to exhaust system control valve devices for automobiles, etc.
In particular, it concerns the installation techniques of exhaust pipes and control valves.

(Prior Art) As a conventional exhaust system control valve device, for example, one described in Japanese Utility Model Application Publication No. 58-25635 is known.

In this conventional device, as shown in FIG. 3, a valve case 51 of a control valve 50 has a case body 52 and a valve shaft boss 53, both of which are manufactured as separate parts.
It was made of a welded product made by welding 53.
The control valve 50 and the exhaust pipe 60 are attached by welding the flanges 54 and 61 to the connection ports of the case body 52 and the exhaust pipe 60, respectively, and then tightening the bolts 70 with the flanges 54 and 61 facing each other. , a flange connection using nuts 71 was used. In addition, 55 is the valve shaft,
56 is a valve plate.

(Problems to be solved by the invention) However, in such a conventional device, the valve case 51 of the control valve 50 is a welded product made of a case body 52 and a boss 53, so the number of parts increases accordingly. There is a disadvantage that
In addition, the hole 57 for the valve shaft is formed in the case body 52 in post-processing, and the boss 53 is attached to the hole 57 and then welded, which requires a lot of processing time. Because it is necessary to accurately position the valve plate 56, high processing accuracy is required, and if the accuracy is poor, there is a problem that operation failure occurs when the valve plate 56 is assembled.

Furthermore, since the control valve 50 is attached to the exhaust pipe 60 by flange connection, two flanges 54, 54 are welded to the case body 52,
Further, the exhaust pipes 60, 60 are each provided with a flange 6.
A total of four flanges (1 and 61) have to be welded, and a large number of bolts 70 and nuts 71 are also required, which increases the number of parts and requires a lot of effort for installation. There was a problem of needing it.

(Means for Solving the Problems) The present invention was made with the purpose of solving the problems of the conventional art as described above.To achieve this purpose, the control valve device of the present invention has two valves. In an exhaust system control valve device in which a control valve is installed between the exhaust pipes, the valve case of the control valve is formed as an integrally molded product in which the case body and the valve shaft boss are integrally molded, and A flared portion was formed at the connection port, and the flared portion covered the case body of the valve case, and at least the abutting end surfaces of the flared portions were welded together.

(Function) Therefore, in the exhaust system control valve device of the present invention,
Since the valve case is made of an integrally molded product that includes the case body and the boss, there is no need for post-processing, and the problem of poor precision can be solved.

In addition, a flare part is formed at the connection port of the exhaust pipe, the case body is covered with this flare part, and the mounting structure is formed by welding the butt ends of the flare part to each other, so no separate parts are required. Moreover, since only welding is required, the assembly work can be easily performed.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The exhaust system control valve device A of this embodiment has two exhaust pipes 1 and 1 in the exhaust system from the engine.
1 and a control valve 2 is installed between them.

The control valve 2 includes a valve case 20, a valve shaft 21, and a valve plate 22.

The valve case 20 is formed as an integrally cast product in which valve shaft bosses 26, 26 are integrally molded at opposing positions in the center of the outer peripheral surface of a cylindrical case body 25.
In this case, the valve shaft 21 is inserted into the valve case 20 and pivotally supported between the bosses 26, 26, and then the slit groove formed in the valve shaft 21 is inserted into the valve shaft 21. The assembly structure is such that the valve plate 22 is inserted into the valve plate 27 and crimped with a rivet 8.

An actuator (not shown) is connected to one end of the valve shaft 21, and the actuator rotates the valve shaft 21 to open and close the valve plate 22.

Next, the exhaust pipes 1, 1 are connected to the control valve 2.
Flare portions 10, 10 are formed at the connection port with the
The flare portion 10 has a depth that is half the length of the case body 25, and has a depth that is half the length of the case body 25.
The inner diameter is formed to fit on the outer periphery of the valve case 20, and the end surfaces 11, 11 have the boss 2 of the valve case 20.
Notches 12, 12 that serve as relief parts for 6, 26
is formed in a semicircular shape.

In order to install the control valve 2 between the exhaust pipes 1 and 1, the case body 2 of the valve case 20 is
The flare parts 10, 10 of the exhaust pipes 1, 1 are attached to both ends of the exhaust pipe 5, respectively, and the end surfaces 1 of both the flare parts 10, 10 are
1 and 11 are fitted together until they are butted against each other. At this time, the bosses 26, 2 are attached to the notches 12, 12.
6 is inserted, exhaust pipes 1, 1 and boss 2
Avoid interference with 6 and 26.

Next, the flare part 1 in the butt state
By welding the end faces 11, 11 of 0 and 10 together along the butting edges, this alone will complete the exhaust pipe 1,
The installation work of the control valve 2 between the exhaust pipes 1 and 1 has been completed, and in this installed state, the control valve 2 is held in a state where it is completely enveloped by the flare portions 10, 10 of both exhaust pipes 1, 1. In addition, W is a welding part.

Therefore, the exhaust system control valve device A of this embodiment
Since the valve case 20 of the control valve 2 is formed as an integrally cast product in which the case body 25 and the bosses 26, 26 are integrally molded, it can be used as a valve case as it is without any post-processing. Further, since the positions of the bosses 26, 26 are determined by molding, high accuracy can be obtained.

Also, when installing the exhaust pipes 1, 1 and the control valve 2, the flare portion 1 of the exhaust pipes 1, 1
0, 10 into the case body 25 of the valve case 20 from both ends, and welding the butt end surfaces 11, 11 of the flare parts 10, 10 together, the installation work is extremely simple. This eliminates the need for separate parts such as bolts and nuts.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific structure is not limited to these embodiments, and the present invention may be modified without departing from the gist of the present invention. included.

For example, in the embodiment, only the abutting end surfaces of the flare portions are welded together, but it is also possible to weld the valve case along the edge of the notch. It is sufficient if the end faces are welded together.

(Effects of the invention) As explained above, in the exhaust system control valve device of the invention, the valve case of the control valve is formed as an integrally molded product in which the case body and the boss are integrally molded. Unlike conventional methods, forming the hole for the valve shaft in post-processing or welding the boss to the case body eliminates post-processing, and since it is an integrally molded product, a certain level of precision is achieved, preventing valve plate malfunctions. You can prevent such problems.

Additionally, the control valve and exhaust pipe can be attached by simply fitting the flare part formed on the exhaust pipe into the valve case and welding the butt ends of the flare part together, unlike conventional flange joints. Only one welding point is required, and there is no need for fastening with bolts or nuts, making installation extremely easy and greatly improving work efficiency.Also, no separate parts are required. This has the effect of being extremely advantageous in terms of cost.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view showing an exhaust system control valve device according to an embodiment of the present invention, FIG. 2 is an exploded view of the device, and FIG.
The figure is an exploded view of a conventional device. A... Control valve device, 1... Exhaust pipe, 2
... Control valve, 10 ... Flare part, 11 ... End face, 20 ... Valve case, 25 ... Case body, 26 ... Valve shaft boss.

Claims (1)

[Claims for Utility Model Registration] In an exhaust system control valve device in which a control valve is installed between two exhaust pipes, the valve case of the control valve is integrally formed by integrally molding the case body and the boss for the valve shaft. A flared portion is formed at the connection port of both the exhaust pipes, and the flared portion covers the case body of the valve case, and at least the abutting end surfaces of the flared portions are welded together. Exhaust system control valve device.