JPS607266Y2 - Front wheel support device for agricultural tractors - Google Patents

Description

[Detailed Description of the Invention] This invention provides an agricultural tractor that is highly effective in protecting the operating body 7 of the power steering 6 and has good front-rear balance.

As shown in FIG. 4, conventional agricultural tractors usually have a front frame 20 constructed of sheet metal or an angle, and a bracket 21 is fixed to the lower surface of the front frame 20.

Therefore, it was light and complex. Agricultural tractors are used with working equipment such as plows and rotavators protruding from behind the rear wheels, and the center of gravity of the tractor is significantly shifted to the rear.

In order to solve this problem, the front axle bracket 20
It was necessary to attach a larger balance weight 24 to the front of the vehicle.

Furthermore, since the actuating body 7 of the power steering 6 was also provided in the middle of the rod 11 on the side of the engine 8,
In addition to causing problems when attaching front loaders and other working equipment, the body was protruded from the sides, making it difficult to protect the body.

In comparison, in this invention, the front axle bracket 1 is made of box-shaped casting and is provided so as to protrude forward from the engine 8, so the weight of the front axle bracket 1 is increased compared to the engine 8.
The center of gravity in the longitudinal direction of the agricultural tractor is moved to the front significantly, improving the longitudinal balance, and the actuating body 7 of the power steering 6 is housed and fixed within the front axle bracket 1, so this precision and expensive power steering is improved. The actuating body 7 of 6 is well protected from obstacles by a thick wall made of cast metal, and retains its initial performance over a long period of time.Since this body is located at the front of the aircraft, the center of gravity is further shifted forward and backward. Maintain good directional balance, and
No matter what kind of work equipment is attached to the tractor, there is no problem with this operating body.

In addition, since the actuating body 7 and the front wheels 17, 17' are connected through the communication hole 3 provided at the bottom of the box of the front axle bracket 1, they can be joined in a short distance, making it easy to disassemble and repair each unit. Moreover, the joints are also effectively protected by the box-shaped front wall.

Next, an agricultural tractor incorporating this invention will be explained based on the drawings.

1 is the front axle bracket, which is a box-shaped integral cast structure whose center part is hollowed out from above, and has a communicating hole 3 (Fig. 3) in a part of the bottom that leads downward. It protrudes forward from the engine 8 and is fixed.

Reference numeral 7 denotes an actuator for the power steering 6, which is housed in a box of the front axle bracket 1 and fixed to the bottom with bolts, and operates the pitman arm 2 by hydraulic pressure in response to a rotation signal from the steering wheel 10 via a rod 11. It is made to rotate left and right.

23 is a front axle, and front wheels 17.
17' is provided to rotate around the longitudinal king pins 16, 16', and the center portion is rotatably attached to the lower abdomen of the front axle bracket 1 on an axis 22 parallel to the forward direction of the fuselage 18. installed.

The end of the pitman arm 2 protruding from the operating body 7 and tie rods 14, 14' for operating the front wheels 17 t 17' are connected from above and below through the communication hole 3 of the front axle bracket 1.

In the figure, the communication hole 3 is formed in a triangular shape, and the joint between the pitman arm 2 and the tie rods 14, 14' is located within the thickness of the communication hole 3, so that both the left and right side walls 4, 5 are It is designed to be protected.

In the figure, 9 is a clutch housing, 12.13 is a gear, 1
5.15' is bell crank, 19 is radiator, 20
2 is a conventional front frame, 21 is a conventional bracket, 24 is a balance weight, and 26 is a bonnet.

Since this agricultural tractor is constructed as described above, when driving on rough terrain, the left and right front wheels 17 and 17' swing up and down about the shaft 22, and the lower ends of all the front and rear wheels touch the road surface. The aircraft 18 operates stably with good contact.

Further, when the steering wheel 10 is operated, the operation signal is transmitted to the rods 11, 11, . ...Gear 12 and Gear 1
3 to reach the operating body 7 of the power steering 6.

Then, in response to this signal, the pressure oil moves to Pitman Arm 2.
to the right or left, the tie rod 14.14' and the bell crank, 15°15', steer the front wheel 17.17'.

The front axle bracket 1 has an integral casting structure and protrudes forward from the engine 8, so the structure is extremely simple and inexpensive, and the weight is toward the front, so the center of gravity in the longitudinal direction of the agricultural tractor can be moved forward. It can be moved,
Even if work equipment such as a plow or rotavator is attached to the rear end, the center of gravity is rarely adjusted using the balance weight 24.

Since the actuating body 7 is housed and fixed in the box of the front axle bracket 1, this precise and expensive actuating body 7 is effectively protected from external interference and can be used stably for a long period of time. Demonstrate function.

Also, since the weight is closer to the front, it also helps improve front-rear balance.

Furthermore, the tie rod t that operates the left and right front wheels 17.17'
-14, 14' are arranged below the front axle bracket 1, and communicate with the pitman arm 2 protruding from the operating body 7 of the power steering 6 provided inside the box of the front axle bracket 1, provided at the bottom of the box. Since they are joined through the hole 3, the two are connected briefly.

[Brief explanation of the drawing]

Fig. 1 is a side view with a part cut away of an agricultural tractor with this invention, Fig. 2 is an enlarged cutaway side view of the part, Fig. 3 is a plan view of the part, and Fig. 4 is a conventional one. FIG. 2 is a side view of a portion of the agricultural tractor. The symbols in the figure are as follows. 1...Front axle bracket, 2...
...Pitman arm, 3...Communication hole, 6.
...Power steering, 7... Actuation body,
Death...Engine, 14.14'...Tie rod, 17,17'...Front wheel, 18...
...Aircraft, 22...Axis.

Claims (1)

[Scope of utility model registration request] It comprises a front axle bracket 1, an actuating body 7 of a power steering 6, and a front axle 23, and the front axle bracket 1 is made of a box-shaped casting whose center part is hollowed out from above, and protrudes forward from the engine 8. The operating body 7 of the power steering 6 is housed and fixed in the box of the front axle bracket 1, and the front axle 23 has a pair of front wheels 17 at both left and right ends. .
and a quilot 14.14' operating the front wheel 17.17'
A front wheel support device for an agricultural tractor, characterized in that the front wheels are connected to each other through a communication hole 3 of a front axle bracket 1.