JPS5918935Y2 - Agricultural tractor steering device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a center bell crank type steering device for agricultural tractors, which avoids interference between the movable parts of the steering device and external protrusions, human bodies, etc., thereby protecting the steering device and ensuring operator safety. The purpose is to ensure that straw scraps, dirt, insects, etc. rolled up by the front tires do not reach the radiator screen or core.

Particularly in agricultural tractors, the main parts of the steering system are located above the front axle near the front tires, so mud and debris thrown up by the tires tend to adhere to the steering system. There is a risk of

However, conventional front axle brackets are not designed to incorporate as much of the steering system components as possible in the vicinity thereof.

Furthermore, although the radiator is mounted on the upper part of the front axle bracket, the lower part of the bonnet space in front of the radiator is not blocked by the front axle bracket, so the straw, dirt, etc. rolled up by the front tires can get stuck on the radiator screen and core. This could cause the engine to become clogged and cause the engine to overheat.

This invention utilizes a front axle bracket fixed to the front end of the engine to isolate the drag rod and bell crank upper arm from the outside and protect these moving parts, and a plate-shaped radiator bracket is attached to the upper end of the front axle bracket. It is installed to cover the drag rods etc. from above as well as to shield the lower part of the space inside the bonnet in front of the radiator.This will be explained next with reference to the drawings.

Figure 1 shows the left side of the front end of the tractor in the center longitudinal section (arrow F
front), the front axle bracket 1 integrally includes an inclined partition wall 4 and a rear wall 5 between the rear leg section 2 and the front leg section 3, and the rear leg section 2 is attached to the front end surface of the engine 7 with a plurality of bolts 6. It is fastened.

8 is a front axle center pin, the rear end (right end in the figure) fits into the hole 9 of the bracket rear leg 2, and the front end fits into the hole 11 of the bracket front leg 3 via the collar 10. , a flange 12 fixed to the front end includes a plurality of bolts 13
It is fastened to the front leg portion 3 of the bracket.

14 is the front axle, with front tires 1 on both left and right ends.
5 is attached, and a boss tube 16 fixed to the center portion is rotatably supported on the center pin 8 via a bush.

The front axle 14 is therefore swingable on the center pin 8.

Reference numeral 18 denotes a generally vertical bell crankshaft, which is integrally provided with a bell crank upper arm 19 at its upper end, and has an inclined bulkhead 4.
The bell crank lower arm 21 is attached to the lower end with a key 22 and a bolt 23.

The arm 21 extends diagonally upward and rearward along the inclined partition wall 4 from the lower end of the shaft 18, and connects with two ball joints 25 at the rear end of a downward opening recess 24 cut out from the inclined partition wall 4 and rear wall 5.
It is connected to the left and right tie rods 26 via.

The bracket 1 has an upwardly opening recess 28 partitioned by left and right side walls 27 above the inclined partition wall 4, and a plate-shaped radiator bracket 30 is attached to the upper end surfaces of the left and right side walls 27 using a plurality of bolts 29. .

31 is a radiator, 32 is a bonnet, and 33 is a mesh at the front end of the bonnet.

The radiator bracket 30 serves as a bottom plate that shields the bottom of the hood interior space 34 in front of the radiator 31 (on the left side in the figure).

The bonnet 32 has a pair of hinge brackets 3 at the lower front end.
6, and this hinge bracket 36 is supported by a hinge bracket 39 on a front hitch 38 via hinge pins 37 in the left and right direction.

The front hitch 38 is attached to the lower half of the front end surface 41 of the front axle bracket 1 with a plurality of bolts 40.

A portion of the front end surface 41 between the left and right hinge brackets 36 is exposed to the front of the tractor, and also serves as a front work equipment mounting block mounting surface (not shown), and has bolt holes 42 (see FIG. 2) for mounting the block. has.

An eaves 43 protrudes forward from the boss portion of the bell crankshaft bearing hole 20, and the eaves 43 connects to the front drive shaft 44.
(center line) bearing mounting surface 45, and the mounting surface 45 is provided with a plurality of bolt holes 46 (FIG. 3) for mounting the bearing.

The front drive shaft is disposed on the center of the engine crankshaft, passes through the recess 28 above the front axle bracket 1, and plays the role of transmitting the rotational force of the crankshaft to the working machine in front of the tractor.

In Fig. 1, 47 is the bell crank lower arm 2.
The stopper 48 is the stopper provided on the front axle bracket 1, and both stoppers 47 and 48 are the stoppers provided on the front axle bracket 1.
Therefore, the rotation range of the bell crank lower arm 21 is limited.

As shown in FIG. 2, the bell crank upper arm 19 extends from the upper end of the bell crank shaft 18 to the side (left side) of the tractor within the upward opening recess 28, and its tip is connected to the drag rod 50 via a ball joint 49. are doing.

The drag rod 50 extends rearward along the side wall 27, and its rear end is connected to a steering gear box (both not shown) via a pitman arm. )
It is a member that moves to.

Further, 51 in FIG. 2 is a knuckle arm, and 52 is a king pin.

Reference numeral 53 in FIG. 3 indicates a bolt hole provided in the bonnet mounting seat 35, which is used when fixing the hinge bracket 39 in FIG. 1.

When the steering wheel is operated to the right and the drag rod 50 is pulled in the direction of arrow A in FIG. 3, the bell crank upper arm 19 and lower arm 21 rotate in the direction of arrow B, and the tie rod 26 moves in the direction of arrow C. The front tire 15 rotates to the right.

When the steering wheel is operated to the left, each part moves in the opposite direction, and the front tires 15 rotate to the left.

In the present invention, the drag rod 50 is housed in an upwardly opening recess 28 surrounded by a side wall 27 as shown in FIG.
The drag rod 50 and the bell crank upper arm 19 are connected to the bell crank upper arm 19 in the radiator bracket 3"0, and the upper end of the recess 28 is closed by the radiator bracket 3"0, so the drag rod 50 and the bell crank upper arm 19 are completely outside, at least in the vicinity of the front axle bracket. be shielded from.

Therefore, there is no fear that mud, dirt, straw, etc. thrown up by the front tires may adhere and accumulate, and the operation is stable, and there is no interference from external protrusions, so the steering device can be protected.

Safety is also improved because there is no direct contact with the human body.

Furthermore, in the present invention, the lower part of the bonnet space 34 in front of the radiator is shielded by the radiator bracket 30 that closes the upper end of the recess 28, so that mud, straw, garbage, etc. rolled up by the front tires 15 are removed from the radiator 31.
There is no risk of clogging the screen or core of the engine, and it has the advantage of reliably preventing engine overheating.

Note that the present invention can be similarly applied to front-wheel drive tractors.

In that case, support shafts may be provided protruding from the front and rear ends of the differential case portion at the center of the front axle, and both support shafts may be supported via bearings on the front and rear legs of the front axle bracket.

[Brief explanation of the drawing]

Fig. 1 is a schematic longitudinal sectional left side view of the front end of a tractor to which the present invention is applied, Fig. 2 is a schematic front view including the II-II cross section of Fig. 1, and Fig. 3 is a partially cutaway plan view. . 1...Front axle bracket, 18...
... Bell crank shaft, 19 ... Bell crank upper arm, 21 ... Bell crank lower arm, 26 ... Tie rod, 28 ...
...Top opening recess, 30...Radiator bracket, 31...Radiator, 50...
...Draglotsud.

Claims (1)

[Scope of utility model registration request] The front axle bracket is provided with a recess that opens upward and supports a substantially vertical bell crankshaft, and the bell crank upper arm, which is fixed to the upper end of the bell crankshaft, is connected to a drag rod within the recess that opens upward and is fixed to the lower end of the bell crankshaft. A steering device for an agricultural tractor, characterized in that a bell crank lower arm is connected to a tie rod, and the upper end of an upwardly opening recess is closed with a plate-shaped radiator bracket, thereby shielding the lower part of a bonnet space in front of the radiator.