JPH0227155Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a butterfly valve for a noise suppressor, and in particular, the valve stem is inserted into a through hole of a partition plate provided inside the intake inertia manifold, and the valve stem is inserted between the partition plate and the valve stem. This invention relates to a butterfly valve for a noise suppressor that has semicircular valve bodies attached to both sides.

As shown in FIG. 1, an intake inertia manifold 1 of a multi-cylinder engine has a partition plate installed inside it in order to reduce intake interference, a phenomenon in which the intake process of one cylinder is inhibited by the intake process of another cylinder. is provided. A butterfly valve 3 is installed inside the intake inertia manifold 1 as a noise suppressor in order to reduce the blowback noise to the intake inertia manifold 1 that occurs when the exhaust brake is activated.

The valve shaft 3A of the butterfly valve 3 is laterally pivoted between pedestals (not shown) provided on the outer periphery of the intake inertia manifold 1. As shown in FIG. 2, the valve body 3B of the butterfly valve 3 is circular and inserted into the intake inertia manifold 1 through an intake port 4 provided in the intake inertia manifold 1, and is inserted into the upper semicircle of the valve shaft 3A. The partition plate 2 is fixed to the columnar cutout middle part 3A' with screws 3C.
It is arranged in a through hole 2A drilled in the hole 2A. After the valve body 3B is installed, a cover (not shown) is attached to the intake port 4 to close the intake port 4. on the other hand,
When the exhaust brake is activated, the valve body 3B is parallel to the partition plate 2, and the butterfly valve 3 is open. When the exhaust brake is activated, the valve body 3B is connected to the partition plate 2 via a control cylinder and an arm (not shown). They are perpendicular to each other, and the butterfly valve 3 is closed to throttle the intake air.

In this prior art, when the butterfly valve 3 is open, the valve body 3B plays the role of the partition plate 2, so the gap G between the through hole 2A of the partition plate 2 and the valve body 3B must be made as small as possible. . Therefore, the machining of the valve body 3B and the hole machining of the partition plate 2 require highly accurate machining, which is also difficult.

This invention was made by focusing on the problems of the conventional technology, and involves inserting the valve stem into a through hole in a partition plate, and inserting semicircular valves on both sides of the valve stem with the partition plate in between. The purpose is to solve the above problems by attaching the body.

This invention will be explained below based on the drawings.

FIGS. 3 and 4 are diagrams showing an embodiment of this invention.

A valve shaft 10A of the butterfly valve 10 is inserted into a through hole 2A provided in the partition plate 2, and both ends thereof are pivotally connected to a pedestal 10B provided on the outer periphery of the intake inertia manifold 1.

The valve body 10C of the butterfly valve 10 has a semicircular shape and is inserted into the intake inertia manifold 1 through an intake port (not shown) provided in the intake inertia manifold 1, and is inserted into the valve shaft 10A with the partition plate 2 in between. It is fixed to the intermediate portion 10A' on both sides by screws 10D. The intermediate portion 10A' is formed by cutting out a part of the valve shaft 10A into a semi-cylindrical shape.

When the exhaust brake is not activated, the valve shaft 10A is rotated and held so that the valve body 10C is approximately parallel to the axial direction of the intake inertia manifold 1, and the butterfly valve 10 is open, as shown in FIG. During operation, the valve shaft 1 is moved such that the valve body 10C is approximately orthogonal to the axial direction of the intake inertia manifold 1.
0A rotates and the butterfly valve 10 is closed. Therefore, unlike the prior art, even when the butterfly valve 10 is open, there is no need for the valve body 10C to play the role of the partition plate 2, so the assembly accuracy, dimensional accuracy, and processing accuracy of the valve body 10C are improved. There is no need to make it very high.

As explained above, this device inserts the valve stem into the through hole of the partition plate and attaches the semicircular valve body to both sides of the valve stem with the partition plate in between, so that the partition plate and the valve body can be connected to each other. The functions are separated. Therefore,
Since there is no need for the valve body to function as a partition plate when the exhaust brake is not activated, unlike in the past, there is an advantage that the valve body does not require highly accurate machining.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view showing the prior art, Fig. 2 is a detailed view of a conventional butterfly valve, Fig. 3 is a partial sectional view showing an embodiment of this invention, and Fig. 4 is a butterfly valve according to this invention. FIG. 1... Intake inertia manifold, 2... Partition plate,
3, 10... Butterfly valve, 10A... Valve stem, 10B... Pedestal, 10C... Valve body, 10D...
…Screw.

Claims (1)

[Scope of utility model registration request] A butterfly valve for a noise suppressor, in which a valve stem is inserted through a through hole in a partition plate provided inside an intake inertia manifold, and semicircular valve bodies are attached to both sides of the valve stem with the partition plate in between.