JPH0329214Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a bonnet intake structure for agricultural tractors.

BACKGROUND ART Agricultural tractors are used to perform various agricultural tasks such as plowing by connecting various working machines such as rotary tillers, but due to the nature of the tasks, they often perform continuous tasks at low speed and high output. Therefore, it is necessary to maintain a good heat balance by improving air intake into the radiator to prevent the engine from burning out. on the other hand,
Tractor work is often carried out in working environments that generate a large amount of mud and dirt, so care must be taken to minimize the amount of dirt inhaled.

However, the engine, radiator, etc. are mounted at the front of the aircraft, and these engines are covered by the bonnet, and the outside air for cooling the engine is generally taken in only through the grille screen section in front of the bonnet. In the type of bonnet that opens and closes by rotating toward the front of the aircraft, there is also a structure in which a skirt is provided below the front of the bonnet in front of the radiator.

Problems to be Solved by the Invention However, as with the conventional method, the intake area is small when air is taken only from the grille screen in front of the bonnet, and this, combined with the special nature of the tractor work mentioned above, causes a deterioration of the heat balance. I was getting used to it.

Means to Solve the Problems Therefore, the present invention pivots the bonnet to the front end of the aircraft so that it can move up and down, and exposes a cover frame below the front of the bonnet in front of the radiator to the outside. In this agricultural tractor, a box-like body having a penal section communicating with the inside of the bonnet is connected to the front surface of the bracket and below the front grille having the screen section and upwardly between the chassis by means of the bracket fixed to the chassis and the cover frame. It is formed to cover both the left and right sides, and has many fine ventilation holes on the front, sides, or bottom of the box-like body, so that outside air can be taken in from both the screen part of the front grill and the ventilation holes of the box-like body. This is an attempt to solve the above-mentioned problems by configuring it as follows.

Function During tractor work, air is drawn into the bonnet not only through the front grille screen but also through the ventilation holes in the box-shaped body made up of the cover frame and bracket, increasing the air intake area into the bonnet and directing it to the radiator. The amount of intake air increases and the heat balance is improved.

Embodiment 1 is a bonnet for an agricultural tractor, and the bonnet 1 is fixed so as to be movable up and down about a pivot shaft 2 provided at the front end of the machine via a bracket to be described later.A screen is provided on the entire surface of the bonnet. A front grill 3 having a portion 3a is fixed with bolts 4.

Cushion materials 5 and 6 are fixed to the inner wall surface of the bonnet 1 through inwardly projecting plates 1a and 1b. A cushion material 7 is also fixed to the inner wall surface of the top plate 1' of the bonnet 1. 8 is an engine, 8a is a cooling fan, 9 is a radiator, and between the radiator 9 and the cushion material 6, a radiator dust-proof net (not shown), which is made of a rectangular frame with a net stretched over it, is removably interposed. There is. A channel-shaped bracket 10 is fixed to the chassis 11, and a battery B and other parts are mounted on the bracket 10. 1
Reference numeral 2 denotes a cover frame having a substantially U-shape in plan and provided below the front of the bonnet 1 in front of the radiator 9 and exposed to the outside from the bonnet 1.
2, a box-shaped body A is positioned below the front grille 3 and between the chassis 11 and has an open portion a communicating with the inside of the bonnet 1 above both left and right sides of the bracket 10 so as to cover the front surface and both left and right sides of the bracket 10. is formed. The front, side, and bottom surfaces of the box-like body A are provided with a large number of fine ventilation holes b by punching, etc., so that the box-like body A functions as a ventilation duct into the bonnet 1. There is. And front grill 3
The bonnet 1 is configured to draw outside air into the bonnet 1 from both the screen portion 3a and the numerous ventilation holes b provided in the box-like body A.

By the way, the assembly structure of the box-like body A is as follows. That is, an L-shaped plate 13 having a bent portion 13a is welded to the rear end portions of the left and right side plates 10a of the bracket 10, and a rising portion 14a of the bottom plate 14 is formed on the vertical surface of the side plate 10a and the plate 13.
14b is welded, and the cover frame 12 is fixed to the bracket side plate 10a and the top surface of the plate 13, and the holes 13 made in the plate 13 and the bottom plate 14 are welded.
b, 14c and holes 12a, 12b made in the cover frame 12
A box-like body A that is open from the top is constructed by aligning and fixing them with bolts 15 and 16, respectively. Nuts 17 and 18 are previously welded to the plate 13 and the bottom plate 14, respectively.

Note that the cover frame 12 has an inward bending portion 1 at the lower end.
2c, 12d are provided, and the bent portion 12
c and 12d are overlapped from below the bottom plate 14.

The upper surface of the cover frame 12 and the bonnet 1 are sealed by a cushion material 5, and the space between the cover frame 12 and the radiator 9 behind it is sealed by a plate 19. On the other hand, between the cover frame 12 and the front grill 3 on the front surface of the bonnet 1, a cover 20 which is fixed in contact with the upper surface of the cover frame 12 is provided.
and the bracket 10 are sealed by a cushion material 21, respectively.

In this embodiment, as shown in FIGS. 1 and 3, the cover frame 12 is structured to wrap inside the bonnet 1, and the sealing between the upper part of the cover frame 12 and the bonnet 1 is performed within the bonnet 1. As a result, the appearance of the sealing member is improved, and since the sealing member is not directly exposed to water during car washing, it is possible to prevent the sealing member from turning over as much as possible.

In the above configuration, when the engine 8 is started, the cooling fan 8a rotates and air is taken into the radiator 9, but this air is not only drawn into the screen portion 3a of the front grille 3 on the front of the bonnet 1, but also into the radiator 9.
Since it is also carried out through the ventilation hole b of the box-like body A constituted by the cover frame 12 and the bracket 10, the bonnet 1
The amount of air taken into the interior is significantly increased compared to the conventional one.
Therefore, despite the simple structure, the heat balance is always maintained well. In addition, the box-like body A formed by the bracket 10 and the cover frame 12 and the inside of the bonnet 1 communicate with each other in a sealed manner from the outside, so that only normal outside air is sucked in while preventing dust from entering from the outside. Ru.

Note that the hot air from the engine 8 is blocked by the dustproof net frame (not shown) and the cushion members 6 and 7, so that it does not flow into the room in front of the radiator.

Effects of the invention As mentioned above, the present invention pivots the bonnet to the front end of the fuselage so that it can move up and down, and also provides a cover frame exposed to the outside from the bonnet at the lower front of the bonnet in front of the radiator. In an agricultural tractor, the bracket fixed to the chassis and the cover frame form a box-like body having an open part communicating with the inside of the bonnet below the front grill having a screen part and upwardly between the chassis and on the front side of the bracket and on both left and right sides. A large number of fine ventilation holes are provided on the front, sides, or bottom of the box-like body, and outside air is taken in from both the screen part of the front grill and the ventilation holes of the box-like body. Therefore, the intake duct to the radiator can be constructed by effectively utilizing existing parts, and outside air can be taken in not only from the front grille screen inside the bonnet but also from the ventilation holes provided in the box-shaped body. As a result, the air intake area into the bonnet increases, making it possible to increase the amount of air intake into the radiator without enlarging the grille screen in any way, making it possible to maintain a good heat balance at all times. can.

[Brief explanation of the drawing]

Fig. 1 is a side view of the front part of the bonnet, Fig. 2 is a perspective view of the main part, Fig. 3 is a longitudinal sectional front view of the main part,
FIG. 4 is a partially cutaway exploded perspective view of the box-like body. In the figure, 1 is the bonnet, 10 is the bracket, 1
1 is a chassis, 12 is a cover frame, A is a box-shaped body, a is an opening, and b is a ventilation hole.

Claims (1)

[Scope of utility model registration request] In an agricultural tractor, the bonnet is pivoted to the front end of the body so as to be movable up and down, and a cover frame is provided below the front of the bonnet in front of the radiator and exposed to the outside from the bonnet. A box-shaped body is formed by the cover frame so as to cover the front surface and both right and left side surfaces of the bracket, and has an opening that communicates with the inside of the bonnet below the front grille having a screen portion and upwardly between the chassis. A bonnet intake for an agricultural tractor characterized by having a large number of fine ventilation holes on the front, side, or bottom of the body so that outside air is taken in from both the screen part of the front grill and the ventilation holes of the box-like body. structure.