JPH0130292Y2 - - Google Patents

Description

[Detailed description of the invention] This invention effectively cools the power steering operating body with the wind passing through the radiator, allowing the power steering to maintain its desired performance over a long period of time.
To provide an agricultural tractor in which the center of gravity is moved forward to effectively maintain front-rear balance, and the lower part of a radiator is protected by a front axle bracket.

Conventional power steering for agricultural tractors is
The actuating body (booster cylinder) was located behind the radiator and on the side of the fuselage, along with the actuating rod. Agricultural tractors are sometimes used with loaders, rakes, and other working equipment protruding from the front of the machine, and the load on the front wheels is extremely high, so the power steering operating body can overheat if used for a long time. The disadvantage was that the performance deteriorated due to

On the other hand, in this invention, by placing the actuating body in front of the radiator, the cooling air immediately before passing through the radiator is used to constantly cool the actuating body, so the actuating body is not overheated and has a low constant temperature. Since the temperature is maintained within the above range, constant performance is always ensured. In addition, since the actuating body is located in front of the radiator, it does not protrude laterally.
It can be stored compactly in the horizontal direction, so it will not be damaged while driving in the mountains, and it will not be a problem when attaching a front loader or other arm.

In addition, with this design, the lower part of the radiator is housed within the front axle bracket made of cast iron, so the lower part of the radiator is protected by the front axle bracket, making it difficult for water to leak and allowing the radiator to be stored low. This not only provides a well-balanced and compact tractor, but also because the front axle bracket is made of heavy cast iron and is installed in front of the prime mover, the center of gravity of the tractor is closer to the front, allowing plows, rotor blades, etc. to move toward the rear. Good balance when equipped with work equipment.

Next, the agricultural tractor with this invention will be explained based on the drawings. 1 is the front axle bracket, which is made of cast iron and shaped like a boat.
It is provided to protrude forward from the prime mover 2. 3
is a front axle, which is equipped with a pair of front wheels 5, 5 that operate together with longitudinal king pins 4, 4 at both left and right ends, and whose center part is parallel to the forward direction on a support leg 6 that projects downward from the front axle bracket 1. It is rotatably supported on a shaft 7.

8 is a radiator which is fixed in front of the prime mover 2 with its lower end housed in a boat-shaped box of the front axle bracket 1, and the water inside is cooled by sucking air from the front with the rotation of a fan 9. It is made to.

Reference numeral 10 denotes a power steering actuating body, which transmits a rotation signal of the steering handle 11 to an actuating rod 1.
2, 12..., and the pressure oil is applied to the operating shaft 13.
It is configured to operate and is fixed horizontally to the upper surface of the front axle bracket 1 in front of the radiator 8. And its operating shaft 13
A pitman arm 14 is provided to protrude rearward from the pitman arm 14, and the rear end of the pitman arm 14 is rotatably connected to the inner ends of a pair of tie rods 15, 15.
The outer ends of tie rods 15, 15 are connected to levers 16, 16.
Connect the front wheels 5, 5 to the ends of the king pins 4, 4.
It is designed to be manipulated around.

In the figure, 17 is a transmission case, 18 is a rear wheel, and 19 is a communication hole.

Since this agricultural tractor is constructed as described above, when the steering wheel 11 is turned to the right or left, the signal is sent to the actuating rods 12, 12.
... is input to the actuating body 10, and the signal moves the pressure oil, causing the actuating shaft 13 to rotate with power. Then, this rotation is transmitted to the levers 16, 16 via the pitman arm 14 and the tie rods 15, 15, and the front wheels 5, 5 are operated to change the direction of travel of the agricultural tractor.

Here, this agricultural tractor has a front loader and a hay rake protruding ahead of the front wheels 5, 5, and uses these to transport manure and grass.
A large load acts on the front wheels 5,5. Therefore, a large force is applied to the actuating body 10 in order to operate the actuating body 10, so that the actuating body 10 may become overheated if the work is performed for a long time.

In this case, the operating body 10 is located in front of the radiator 8 and is therefore placed in the flow of air sucked into the radiator 8 by the rotation of the fan 9. Therefore, a fan 9 for cooling water in the radiator 8
However, since the operating body 10 is also cooled and kept at a low temperature even when used for a long time, the operating body 10 always exhibits good performance.

In addition, since the actuating body 10 is located in front of the radiator 8 and is housed within the width of the radiator 8 and does not protrude to the left or right, it will not become an obstacle and will not be damaged.

Since the lower part of the radiator 8 is housed in the boat-shaped box of the front axle bracket 1, the sturdy front axle bracket 1 protects it from stones and stumps when the agricultural tractor is driven over rough terrain. Since it will not be damaged, there will be no water leakage.

Furthermore, since the front axle bracket 1 is made of cast iron, it is heavier at the front than the prime mover 2, and the center of gravity is closer to the front. Therefore, rear wheel 1
When a working device such as a plow or rotavator is mounted protrudingly behind the wheels 8 and 18, the front wheels 5 and 5 are not easily lifted up, resulting in good operability and high safety.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of an agricultural tractor to which this invention has been applied, FIG. 2 is an enlarged cutaway side view of a portion thereof, and FIG. 3 is a plan view thereof. In addition,
The symbols in the figure are as follows. 1... Front axle bracket, 2... Prime mover, 3... Front axle, 4... King pin, 5... Front wheel, 6... Support leg, 7... Shaft, 8...
Radiator, 9... Fan, 10... Operating body, 1
DESCRIPTION OF SYMBOLS 1... Steering handle, 12... Operating rod, 13... Operating shaft, 14... Pitman arm, 15... Tie rod, 16... Lever, 17
...Mission case, 18...Rear wheel, 19...
Communication hole.

Claims (1)

[Scope of utility model registration request] The front axle is equipped with a boat-shaped front axle bracket, a pair of front wheels on both left and right ends, a radiator that cools the cooling water of the prime mover, and a power steering actuator that operates the front wheels.The front axle bracket is made of cast iron and is mounted in front of the prime mover. The center part of the front axle is attached to the lower part of the front axle bracket so that it can rotate freely on a longitudinal axis, and the lower end of the radiator is housed in a boat-shaped box of the front axle bracket. A steering device for an agricultural tractor, characterized in that the operating body is fixed to the upper surface of the front axle bracket in front of the radiator.