JPH0540249Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is an engine bonnet in which a radiator and an engine are arranged and housed in a horizontal line behind the driver section of a swivel platform equipped with a backhoe device at the front. In addition, in the engine bonnet, horizontal and rearwardly inclined side walls are formed between the left and right side walls and the rear wall, and a large number of intake holes are formed in the left and right inclined side walls located on the radiator side. The present invention relates to an exhaust structure for engine cooling air of a backhoe work vehicle, in which a large number of exhaust holes are formed in the one located on the other side.

[Conventional technology]

In the exhaust structure for engine cooling air of this type of backhoe work vehicle, conventionally only a large number of exhaust holes were provided in the inclined side wall located on the side opposite to the radiator side.

[Problem that the invention attempts to solve]

Therefore, since no other soundproofing measures were taken, engine operating noise and cooling fan noise leaked out along with the cooling exhaust air, creating a large amount of noise towards the rear of the swivel base.

An object of the present invention is to provide an effective soundproofing measure without reducing exhaust efficiency by adding a simple mechanism to the inclined side wall in which a large number of exhaust holes are formed.

[Means for solving problems]

The characteristic configuration of the present invention is that a plurality of plate-shaped sound absorbing devices having a multilayer structure of iron plates and sound-absorbing materials are provided inside the inclined side wall having the exhaust hole, and the plurality of plate-shaped sound absorbing devices have a horizontal cross section. When viewed from above, the metal plates extend in the lateral direction of the swivel table, are lined up at intervals in the front and rear, and are placed in front of the iron plate in a state in which adjacent items overlap in the lateral direction of the swivel table. The sound absorbing material is installed with the sound absorbing material attached, and its effects are as follows.

[Effect]

As described in the characteristic configuration, an air exhaust path for exhaust air is formed by the front and rear adjacent plate-shaped sound absorbers, and a sound absorbing material acts to absorb the exhaust air introduced into this air exhaust path. , exhaust from the exhaust hole.

[Effect of idea]

Therefore, by setting the exhaust air passage to the side of the swivel base, the direction of the exhaust air leakage is limited and the leakage of noise to the rear is suppressed. The sound-absorbing material provides a sound-absorbing effect and can also reduce the leakage of noise in the lateral direction.Furthermore, since the opening area for the exhaust hole is maintained at the same area, there is no change in the heat exhaust effect. There isn't.

〔Example〕

As shown in FIG. 2, a swivel base 2 is attached to a machine base equipped with a crawler traveling device 1 so that it can be driven and rotated freely around the vertical axis P, and a driver's seat 3 and an operating lever 4 are installed on the swivel base 2. An engine bonnet 8 is provided with a radiator 6 and an engine 7 arranged and housed in a horizontal line along the lateral direction of the swivel base 2 from the right side. A backhoe device 9, which can freely swing up and down and bend/stretch, is attached to the front end of the rotating platform 2, and a dozer device 10 is attached to the front end of the platform to form an earthwork vehicle.

As shown in FIG. 1, between the left and right side walls 11, 11 and the rear wall 12 of the engine bonnet 8, there are left and right inclined side walls 13 in a sideways and backward facing position.
A, 13B are formed, and a large number of intake holes 13b are formed in the right inclined side wall 13B on the radiator side, and a large number of exhaust holes 13a are formed in the left inclined side wall 13A on the engine side. Here, a cooling fan 14 is attached to the side surface of the engine 7 facing the radiator 6, and the cooling fan 14 closes the air intake hole 13b.
Cooling air is taken in, the cooling air is made to act on the radiator 6 and the engine 7, and is discharged from the exhaust hole 13a. In the figure, 15 is an air cleaner, and 16 is a muffler.

As shown in FIG. 1, a plurality of plate-like sound absorbers 19 having a multilayer structure of an iron plate 17 and a sound absorbing material 18 such as soft resin or glass wool are attached to a base 20, and this base 20 is attached to the left inclined side wall 13A. It is located inside the left inclined side wall 13A having the exhaust hole 13a. The plurality of plate-shaped sound absorbers 19
In horizontal cross-sectional view, its left end is the left inclined side wall 13A.
It is extended along the lateral direction of the swivel base 2 at a constant distance from In addition, the sound absorbing material 18 is installed on the front surface of the iron plate 17.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the engine cooling air exhaust structure for a backhoe vehicle according to the present invention, with FIG. 1 being a horizontal sectional view of the interior of the engine bonnet, and FIG. 2 being a side view of the backhoe vehicle. 2...Swivel base, 5...Driving unit, 6...Radiator, 7...Engine, 8...Engine bonnet, 9...Backhoe device, 11...Side wall, 12
... Rear wall, 13A, 13B ... Left and right inclined side walls, 1
3a...exhaust port, 13b...intake port, 17...iron plate, 18...sound absorbing material.

Claims (1)

[Scope of utility model registration request] A radiator 6 and an engine 7 are installed behind the driving section 5 on the rotating platform 2 equipped with a backhoe device 9 at the front.
The engine bonnet 8 includes the left and right side walls 11, 11 and a rear wall 12, and is provided with inclined side walls 13A, 13B extending laterally and rearward between the left and right side walls 11, 11 and a rear wall 12.
The left and right inclined side walls 13A, 13B are formed with a number of intake holes 13b on the one located on the radiator side, and a number of exhaust holes 13a on the other one. The inclined side wall 13A having the exhaust holes 13a is provided on the inside thereof.
In a horizontal cross-sectional view, a plurality of plate-shaped sound absorbers 19 each having a layered structure of steel plate 17 and sound-absorbing material 18 are arranged at intervals in the front-to-back direction so as to extend laterally across the swivel table 2, with adjacent ones in the front-to-back direction wrapping around each other in the lateral direction of the swivel table 2, and the sound-absorbing material 18 is attached to the front of the steel plate 17, in an exhaust structure for engine cooling air for a backhoe work vehicle.