Engine compartment structure of a work machine

Abstract

In a structure of an engine compartment in a work machine such as a tractor, a bulldozer, a hydraulic excavator, a wheel loader, the air taken through vents, which are formed on side covers and a hood covering the engine compartment, is supplied directly to a radiator via ducts which are provided on the side of the side covers and the side of the hood respectively. The ducts cover the vents, thereby preventing noise within the engine compartment from escaping to the outside. Therefore it is possible to increase a cooling efficiency of the radiator by supplying the outside air, which does not take up the heat of an engine, directly to the radiator, as well as to reduce the engine sound and prevent the engine noise from escaping.

Description

BACKGROUND OF INVENTION[0001] 1. Field of the Invention[0002] The present invention relates to a structure of an engine compartment in a work machine, for example, a tractor, a bulldozer, a hydraulic excavator, a wheel loader and the like. More particularly, it relates to the structure which is capable of improving a cooling efficiency with respect to a radiator, reducing an engine sound and preventing a noise from the engine compartment.[0003] 2. Description of the Related Art[0004] In general, such a structure of the inside of an engine compartment in a work machine has been known that a radiator and an oil cooler are arranged in a front portion of the engine or the like for cooling the radiator and the oil cooler by a cooling fan. The cooling fan is directly driven by means of a belt drive or the like by the engine, or is driven by an electric motor or a hydraulic motor, which is rotated and controlled independently of the engine rotation. For the cooling of a radiator, an oil co...

AI Technical Summary

Problems solved by technology

However, in the former (Japanese Patent Application Laid-Open No. 2001-27130) of the above mentioned prior arts, since the engine compartment is covered by the shielding plate in a sealed state, the temperature inside the engine compartment becomes high due to a heat generation of the engine.

Accordingly, since the engine speed gets high and the engine generates more heat, it is hard to improve the cooling efficiency.

Further, it is required to provide the engine cooling fan and the radiator cooling fan respectively, which makes the structure of the inside of the engine compartment complex.

However, since the cold blast which cools the engine is used for cooling the radiator and the oil cooler, the cooling efficiency with respect to the radiator is deteriorated when the temperature of the cold blast which has cooled the engine rises due to the heat generation of the engine.

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