JPS5830087Y2 - Internal combustion engine exhaust flexible pipe device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an exhaust pipe device for an internal combustion engine, and in particular to a flexible exhaust pipe when the engine is supported in a vibration-proof manner.
Regarding equipment.

When the engine is supported on the pedestal via an elastic body in a vibration-proof manner, if the amplitude of vibration of the engine is large, there is a risk that cracks will occur in the flexible exhaust pipe if the flexible exhaust pipe is simply installed. be.

The present invention is an attempt to deal with such inconveniences, and by appropriately selecting the vibration (direction) of the engine and the flexibility performance (flexibility direction) of the flexible tube, the flexible tube due to the vibration of one engine can be reduced. The purpose of this invention is to arrange the flexible exhaust pipe relative to the engine so that the direction of the engine's crankshaft and the axial direction of the flexible pipe are parallel. It is.

Next, embodiments of the present invention will be described with reference to figures.

In the figure, the engine body 1 is installed between the legs 2 and the elastic body 3.
It is attached to the platform 5 of the hull 4 via a vibration-proof method.

6 is the output shaft of the engine, and a screw 7 is attached to the end of the output shaft 6.
is fixed.

8 is an exhaust muffler for the engine, and the exhaust muffler 8 and the exhaust manifold 9 of the engine are connected by a flexible exhaust pipe 10.

As shown in an enlarged view in FIG. 4, the exhaust flexible pipe 10 has a large number of folds 11 so that it can expand and contract in the axial direction of the restrictor pipe.
is formed continuously with a flexible portion 12 interposed therebetween.

On the other hand, since the engine body 1 is attached to the platform 5 via the elastic body 3, the engine is relatively free to vibrate, and the main fluctuations (vibration motion) of the engine body during vibration are caused by It is known that this is a rolling motion (rotational vibration) centered on the crankshaft, as indicated by arrow A in the figure.

As described above, the flexible exhaust pipe 10 is formed by a large number of folds 11 connected in the axial direction with the flexible portions 12 interposed therebetween, so that the flexible exhaust pipe 10 can be expanded and contracted in the axial direction. In addition to being flexible, the flexible portion 12 between adjacent pleats can effectively follow deflection in the axial direction by stretching on one side and contracting on the opposite side.

Therefore, when the flexible exhaust pipe 10 is arranged so that its axis is parallel to the crankshaft of the engine (see Fig. 2), it can effectively follow the rolling motion of the engine, making it difficult for the flexible exhaust pipe to move. There is no risk of strong force acting on it.

Therefore, as in the present invention, the exhaust flexible.

When placing the tube 10 parallel to the engine crankshaft,
The durability of the flexible exhaust pipe can be improved, and it is possible to install a flexible exhaust pipe that connects the engine to an engine that elastically supports the engine and the exhaust silencer is fixed to a separate platform. However, it can have many effects and effects.

[Brief explanation of drawings]

The figures show an embodiment of the present invention; Fig. 1 is a side view of the entire engine equipped with the flexible exhaust pipe mounting device of the present invention;
The figure is a plan view of the same, FIG. 3 is a front view of the same, and FIG. 4 is a partially enlarged view of the exhaust flexible pipe. 1... Engine body, 3... Elastic body, 5.
...Plinth, 8...Exhaust silencer, 9...
...Exhaust manifold, 10...Exhaust flexible pipe, 11...Folds, 12...Flexible portion.

Claims (1)

[Scope of utility model registration request] In an exhaust pipe device in which an exhaust silencer is elastically supported on a platform of the engine body, an exhaust silencer is fixed to a platform different from the platform, and the two are connected by a flexible exhaust pipe, An internal combustion engine exhaust flexible pipe device in which the pipe is arranged parallel to the engine crankshaft.