JPS5918936Y2 - Agricultural tractor front axle bracket - Google Patents

Description

[Detailed description of the invention] This invention relates to the structure of a front axle bracket that is fixed to the front end of the engine of an agricultural tractor and supports the front axle and center bell crank type steering device, and has a well-organized and compact structure with increased rigidity. ,
The main parts such as the drag rod and bell crank upper arm that make up the steering system are splashed with mud by the front tires.
The purpose is to shield from dust and the like as much as possible, and to enhance the shielding function for the space inside the hood.

As a steering device near the front axle, a drag rod extends in the front-rear direction, and below it, tie rods are arranged in the left-right direction.In order to securely connect the two, the center bell crank, which serves as a connector, is connected to the front axle bracket. The front axle bracket must be supported stably, which increases the vertical height of the front axle bracket, and increases the thickness and weight of the front axle bracket.

In addition, because most of the conventional steering gear is exposed downwards, there is a possibility that mud, straw, etc. thrown up by the front tires may adhere and accumulate, causing problems such as an increase in the steering force or a decrease in the steering angle. was there.

Furthermore, if the front axle bracket is a simple ladder-shaped frame, dirt, grass, insects, etc. rolled up by the front tires can enter the bonnet and clog the radiator screen and core, causing engine overheating.

In this invention, the front axle bracket that is fixed to the front end of the engine is formed into an eave-like (or shell-like) shape, and an inclined bulkhead is separated from the bracket body to form a recess that opens upward and a recess that opens downward, and utilizes the inclined bulkhead. The nearly vertical bell crank shaft is rigidly supported, and the bell crank upper arm fixed to the upper end of the bell crank shaft is connected to the drag rod in an upwardly opening recess, thereby preventing mud and dust from reaching the bell crank upper arm and the drag rod. It is characterized by preventing the front axle bracket from increasing, stably supporting the drag rod and tie rod without significantly increasing the vertical height of the front axle bracket, and shielding the space inside the bonnet by the front axle bracket. This is explained by:

Figure 1 shows the left side of the front end of the tractor (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.
The bearing mounting surface 45 is provided with a plurality of bolt holes 46 (FIG. 3) for mounting the bearing.

The front drive shaft 44 is arranged on the center of the engine crankshaft and is attached to the front axle bracket 1.
It passes through the upper recess 28 of the tractor, 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. direction)
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.

As explained above, in the present invention, the front axle bracket 1 is provided to protrude forward from the engine 7 like an eave, and the downward opening recess 24 (
1) and an upwardly opening recess 28 (Fig. 2) are partitioned and arranged side by side, and a drag rod 5 is inserted into the upwardly opening recess 28 at the tip of the upper arm 19 fixed to the upper end of the bell crankshaft 18.
0, and the left and right tie rods 26 are connected to the bell crank lower arm 21 fixed to the lower end of the bell crankshaft 18 within the downward opening recess 24, so it is unavoidable that the steering device is exposed downward. Bell crank lower arm 21. With the exception of the tie rod 26, the main components, the upper arm 19 and the drag rod 50, can be covered from below by the main body of the front axle bracket 1, and the mud, straw, etc. thrown up by the front tires 15 can be removed from the drag rod 50 and the bell crank. Upper arm 1
9 can be prevented as much as possible (increase in steering force, decrease in steering angle, etc.) caused by deposits on the drag rod 9. As a result, the drag rod 50 is protected and safety is improved.

Since the bell crankshaft 18 is supported by the bearing hole 20 of the inclined partition wall 4, the drag rod 50 in the front-rear direction and the tie rod 2 in the left-right direction can be mounted without increasing the vertical height of the bracket 1.
6 can be connected, the support portion of the steering device can be simply put together, and sufficient rigidity can be ensured.

Since the front axle bracket 1 is eave-shaped, it functions as a bottom plate for the bonnet interior space 34, and mud, straw, insects, etc. thrown up by the front tires 15 are removed from the radiator 31.
This eliminates the risk of the 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 by bearings on the front and rear legs of the front axle bracket.

[Brief explanation of drawings]

Fig. 1 is a schematic longitudinal sectional left side view of the front end of an agricultural tractor to which the present invention is applied, Fig. 2 is a partial front view including the I■-■I cross section of Fig. 1, and Fig. 3 is a partially cutaway view. FIG. 1...Front axle bracket, 4...
...Slanted bulkhead, 7...Engine, 18...
... Bell crank shaft, 19 ... Bell crank upper arm, 21 ... Bell crank lower arm, 24 ... Bottom opening recess, 26 ...
...Tie rod, 28...Top opening recess, 5
0...Drag rod.

Claims (1)

[Scope of utility model registration request] An eaves-shaped front axle bracket fixed to the front end of the engine has a slanted bulkhead, with a recess that opens upward and a recess that opens downward side by side.A bell crankshaft that is approximately perpendicular to the bulkhead is supported and fixed to the upper end of the bell crankshaft. This front axle bracket for an agricultural tractor is characterized in that a bell crank upper arm is connected to a drag rod in an upward opening recess, and a bell crank lower arm fixed to the lower end of the bell crank shaft is connected to a tie rod in a downward opening recess.