JPS632594Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an engine that supplies warm air near the exhaust manifold to the engine when the outside temperature is lower than a predetermined temperature to promote fuel atomization and combustion of the air-fuel mixture. This invention relates to a warm air introduction device.

Conventionally, this type of device has a hot air hood installed so as to cover the top and side surfaces of the exhaust manifold, which is attached to the cylinder head of the engine via a gasket, leaving a gap, and the hot air hood is connected to the intake system through a duct. Those connected to are known.

In this case, if the end surface of the warming hood on the cylinder head side is brought into contact with the cylinder head, when the warming hood is vibrated by the engine etc., noise will be generated from the contact part with the cylinder head. Although the end face of the hood is separated from the cylinder head, there is a problem that if this is done, a portion of the warm air around the exhaust manifold escapes through the gap between the cylinder head and the hot air hood, reducing the efficiency of introducing warm air.

The object of the present invention is to provide a warm air introduction device that prevents hot air from escaping around the exhaust manifold and absorbs and suppresses vibrations of the hot air hood. An exposed part is provided between the joint surfaces with the manifold, and the cylinder head side end surface of the warm air hood is brought into contact with the exposed part, thereby fixing the warm air hood to the exhaust manifold.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. 1, an exhaust manifold 3 is fixed to the outer surface of a cylinder head 1 of an engine E with a plurality of bolts 4 through a gasket 2. The warm air hood 5 is arranged so as to cover the upper and side surfaces of the exhaust manifold 3 with a gap, and there is a gap between the connecting pipe section 6 protruding from the outer surface of the warm air hood 5 and the warm air introduction pipe section 8 of the air cleaner 7 as an intake system. They are connected by a flexible duct 9. The air cleaner 7 includes a room temperature outside air introduction pipe section 10 that introduces room temperature outside air to the outside of the warm air introduction pipe section 8. When the air temperature is higher than a predetermined temperature, an automatic switching mechanism (not shown) switches the connection to the normal temperature outside air introduction pipe section 10.

As shown in FIG. 2, the outer periphery of the gasket 2 has an exposed portion exposed between the joint surfaces 1a and 3a of the cylinder head 1 and the exhaust manifold 3, that is, from the upper edge and both side edges of the joint surface 3a of the exhaust manifold 3. 2a
The cylinder head side end surface 5a of the hot air hood 5 is in contact with the exposed portion 2a, and the hot air hood 5 is attached to a plurality of mounting seats 13 protruding from the upper surface of the exhaust manifold 3 by a plurality of bolts 12. Fixed. Further, the lower peripheral edge of the warm air hood 5 is close to the side edge of the exhaust manifold 3,
It is designed to efficiently heat the surrounding air. Furthermore, the exhaust manifold 3 is attached to the warm air hood 5.
A heat radiation hole 14 is formed opposite to the mounting bolt 4, and warm air around the bolt 4 is released to the outside through the heat radiation hole 14 to prevent the bolt 4 from being overheated.

In the above configuration, when the outside temperature is lower than a predetermined temperature, the inside of the air cleaner 7
As a result, warm air around the exhaust manifold 3 is guided to the air cleaner 7 via the warm air hood 5 and the duct 9, where it is purified and then supplied to the engine E. In this case, since the end surface 5a of the hot air hood 5 is in contact with the exposed portion 2a of the gasket 2, warm air will not escape from between the cylinder head 1 and the hot air hood 5, and the introduction efficiency can be improved. In addition, the elasticity of the gasket 2 absorbs and suppresses vibrations propagating from the cylinder head 1 to the hot air hood 5 and vibrations of the hot air hood 5 itself, thereby reducing noise at the contact area between the cylinder head 1 and the hot air hood 5. .

When the engine is sufficiently warmed up, the inside of the air cleaner 7 is communicated with the room temperature outside air introduction pipe section 10, and the warm air introduction pipe section 8 is shut off, so that the engine E is supplied with room temperature outside air.

As described above, according to the present invention, the cylinder head side end surface of the hot air hood is brought into contact with the cylinder head of the engine through the exposed portion of the gasket, so that the warm air in the hot air hood is drawn from between the cylinder head and the hot air hood. It is possible to prevent the air from escaping, improve the efficiency of introducing warm air, and contribute to shortening the engine warm-up operation time. In addition, the elasticity of the gasket absorbs and suppresses the vibration of the hot air hood, thereby reducing noise at the cylinder head and the hot air hood contact area.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which FIG. 1 is a side view of the entire main part cut away, and FIG. 2 is a sectional view taken along the line of FIG. 1. E...Engine, 1...Cylinder head, 1a
...Joint surface, 2...Gasket, 2a...Exposed part, 3...Exhaust manifold, 3a...Joint surface, 5
... Warm hood, 5a... End face, 7... Air cleaner as an intake system, 9... Duct.

Claims (1)

[Scope of utility model registration request] A warm air hood is arranged so as to cover the top and side surfaces of the exhaust manifold attached to the cylinder head of the engine via a gasket, leaving a gap in between.
In an engine warm air introduction device in which the warm air hood is connected to the intake system through a duct, an exposed portion is provided on the outer periphery of the gasket and exposed from between the joint surfaces of the cylinder head and the exhaust manifold, and 1. A hot air introduction device for an engine, characterized in that the hot air hood is fixed to the exhaust manifold by bringing a cylinder head side end surface of the hot air hood into contact with the hot air hood.