JPS6226594Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an automobile exhaust brake in which a butterfly valve is arranged in an exhaust pipe, and in particular, the invention relates to an exhaust brake for an automobile in which a butterfly valve is arranged in an exhaust pipe, and in particular, a butterfly valve is arranged in an exhaust pipe and two butterfly valves arranged in the exhaust pipe so as to have a gap in a closed state. The present invention relates to a vehicle exhaust brake consisting of two butterfly valves, each of which is arranged so that its respective rotation axes are rotated approximately 90 degrees and crossed.

Conventional butterfly valve type exhaust brakes have one butterfly valve installed inside the cylinder, and the only way to improve braking force is to narrow the valve gap between the inner wall of the cylinder and the outer circumference of the butterfly valve. However, there were limits to narrowing the gap due to manufacturing accuracy, wear of the stopper mechanism, etc. In addition, if the valve gap is made extremely small, the cylinder and butterfly valve may come into contact and damage the butterfly valve, components in the exhaust gas may adhere to the butterfly valve and the valve may not operate properly, or the valve may not operate properly due to high temperatures. This caused the butterfly valve to seize into the cylinder, and there was a limit to how narrow the valve gap could be. For this reason, there was a limit to the ability to improve the braking power of butterfly valve exhaust brakes.

The purpose of this invention is to eliminate the above drawbacks, and it has the same principle as the commonly used butterfly valve type exhaust brake, and its operation is also based on air or vacuum pressure (negative pressure). However, it is an object of the present invention to provide an exhaust brake for an automobile that uses two butterfly valves and in which the arrangement state, that is, the arrangement angle, of each butterfly valve within the cylinder is different.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In the drawing, an automobile exhaust brake or exhaust brake according to the present invention is shown, which comprises a cylinder 1 and two butterfly valves 2, 3 disposed inside the cylinder 1.
Consisting of The cylinder 1 has one end connected to an exhaust manifold or an exhaust pipe (not shown), and the other end connected to an exhaust pipe (not shown), and the cylinder 1 and the exhaust pipe body constitute an exhaust pipe. It is something that exists. Inside the cylinder 1, two butterfly valves 2 and 3 are arranged which can be swung by remote control about axes 6 and 7 passing through the central axis 5 of the cylinder. The butterfly valves 2 and 3 are arranged in different positions, with their respective rotation axes 6 and 7 intersecting with each other, with one rotated approximately 90 degrees relative to the other. The butterfly valves 2 and 3 are in an open state with their surfaces parallel to the central axis 5 of the cylinder 1, and in a closed state, there is a gap between the inner wall of the cylinder 1 and the outer circumference of the butterfly valves 2 and 3. It is configured so that a gap 4 is created. In the figure, arrow A indicates the flow direction of exhaust gas.

To explain how it works, when applying the exhaust brake, both butterfly valves 2 and 3 are closed by remote control, which blocks the flow of exhaust gas toward the exhaust pipe and maintains a relatively high rotational speed. This generates a large amount of back pressure on the exhaust manifold side of the engine, which works as an exhaust brake.

As described above, the automobile exhaust brake of the present invention has a structure in which a gap is actively provided between the butterfly valve and the exhaust pipe, so it is necessary to consider issues such as manufacturing accuracy and wear of the stopper mechanism. Moreover, since the two butterfly valves are arranged in different positions with their respective rotation axes rotated approximately 90 degrees and intersecting each other, and with a constant valve clearance, In addition to having a sealing effect due to the labyrinth effect, the exhaust resistance is increased by making the flow of exhaust gas irregular, making it possible to further improve the sealing effect and improve the braking force.
Moreover, since there is no need to increase manufacturing precision, manufacturing costs are reduced, and the desired exhaust brake performance can be secured with a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a schematic front sectional view showing an exhaust brake for an automobile according to the present invention, and FIG. 2 is a side sectional view of FIG. 1. 1... Cylinder, 2, 3... Butterfly valve, 4... Gap, 5, 6, 7... Shaft.

Claims (1)

[Scope of utility model registration request] Consisting of two butterfly valves disposed in the exhaust pipe, the butterfly valves are formed to have a constant valve gap between them and the inner wall of the exhaust pipe in the closed state, and each of the butterfly valves is An exhaust brake for an automobile, characterized in that the rotational axes of the two are arranged in such a manner that one axis of rotation is rotated approximately 90 degrees with respect to the other and intersect with each other.