JPS6031971Y2 - Knuckle arm in steering drive wheel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steering drive wheel, particularly a knuckle arm that is a front wheel steering member in a four-wheel drive agricultural riding tractor.

Conventionally, this type of knuckle arm 39' is shown in FIGS. 6 and 7.
As shown in the figure, an arm portion 39'C for connecting to the final case 5 was formed in a planar shape 41'.

For this reason, the gap 13 between the rim wheel and the rim wheel (see FIG. 1) was narrow and was heavily clogged with dirt, grass, and the like.

Further, mud, grass, etc. lifted by the wheel rim directly enter the inside of the arm portion 39'C, that is, between the gear case 3 and the gear case 3, and accumulate in the gap C, resulting in the formation of the knuckle arm 39'. The turning resistance was large, making steering operations difficult.

In particular, the cavity C becomes narrower as it goes inside,
The rotating operation of the arm 39' resulted in the narrow part C' being caught in the narrow part C', and foreign matters such as grass, straw, and rice were caught and could not be removed.

Furthermore, the strength of the knuckle arm 39'C is weak, and it is necessary to make the arm part 39' large. Therefore, the final case protrudes significantly from the rim wheel, making it difficult to push mud etc. during plowing or plowing work. This not only increased power loss due to the resistance of the soil, but also caused grooves to form on the puddling surface.

Therefore, in the present invention, the final case connecting arm part of the knuckle arm is constituted by a bowl-shaped part whose inner surface is formed by a radius with a slight gap along the radius of the outer surface shape of the gear case. It is an object of the present invention to provide a knuckle arm for a steering drive wheel that eliminates the above-mentioned drawbacks.

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings.

The steering wheel 1 includes an axle housing 2, a gear case 3, and a final case 5, as shown in FIGS. 1 and 2.

Axle housing 2 is differential shaft 6
A bevel gear 7 is fixed to the tip of the shaft 6.

The gear case 3 is fixed to the axle housing 2, and an upper metal 10 is fixed to the upper part thereof with bolts 9.

Further, the lower part thereof is a hollow shaft portion 3a, and the shaft portion 3a is a hollow shaft portion 3a.
A sleeve portion 5a of the final case 5 is rotatably fitted into the sleeve portion a through a bush 11 and an oil seal 12.

A lower metal 13 is fixed to the lower part of the final case 5 by bolts 15, and a drain plug 16 is screwed to the lower part of the metal 13.

A gear shaft 2 with bevel gears 17 and 19 fixed above and below the gear case 3 and the final case 5.
0 is rotatably supported by bearings 21 and 22, and the gear shaft 20 is a hollow shaft portion 3a of the gear case 3.
are arranged concentrically.

A bearing holder 23 is fixed to the final case 5, and a final shaft 27 is rotatably supported by the holder 23 via a bearing 25 and an oil seal 26.

One end of the final shaft 27 is an integrally formed hub portion 27a, and a bevel gear 29 is fixed to the other end.

A disk 32 of a wheel 31 is fixed to the hub portion 27a via bolts 30, and a rim 35 holding a tire 33 is welded to the disk 32.

Further, the bevel gear 29 meshes with the bevel gear 29 of the gear shaft 20.

On the other hand, a protrusion 10a is formed on the upper metal 10 so as to be aligned with the gear shaft 20, and a knuckle arm 39 is rotatably fitted into the protrusion 10a via a thrust liner 36 and a bush 37. Furthermore, the fitting hole is closed by an expansion plug 38.

As shown in detail in FIGS. 3, 4, and 5, the knuckle arm 39 includes a drag link connecting arm portion 39a, a tie rod connecting arm portion 39b, and a final case connecting arm portion 39c.

The connecting arm portion 39a is connected to the steering device via a drag link 40, and the connecting arm portion 39b is connected to the other wheel via a tie rod.

Further, the final case connecting arm portion 39c is constituted by a bowl-shaped portion 41 whose inner surface is formed by a radius R2 having a slight gap C along the radius R□ of the outer surface shape of the gear case 3.

Further, the distal end of the connecting arm portion 39c is formed by a flat surface 42, and the flat surface 42 is fixed to the final case 5 with bolts 43.

Further, reinforcing ribs 45 are formed at both ends and the center of the bowl-shaped portion 41 and the flat surface 42, respectively.

Since the present invention has the above configuration, power from the engine is transmitted to the differential shaft 6 and further transmitted to the gear shaft 20 via the bevel gear 7.17.

The rotation of the gear shaft 20 is transmitted to the final shaft 27 via the bevel gear 19.29, and the wheel 31 is rotated.

Further, when the steering wheel is operated, the operating force is transmitted to the knuckle arm 39 via the steering device and the drive link rod 40.

The knuckle arm 39 is the protrusion 10a of the upper metal shaft 10.
Further, since the knuckle arm 39 is fixed to the final case 5 by a bolt 43, the final case 5 is also rotated around the hollow shaft portion 5a of the gear case 3.

Therefore, the final shaft 27 supported by the final case 5 rotates, and the wheel 31 rotates around the gear shaft 20.

At the same time, the other wheel is also rotated in the same direction via the tie rod connecting arm 39b and the tie rod, and the wheels of the tractor or the like are steered.

At this time, as the wheel 31 rotates, mud etc. are lifted up, but since the connecting arm portion 39c of the knuckle arm 39 is formed by the bowl-shaped portion 41, the connecting arm portion 39c is lifted up.
The gap C between the gear case 9c and the gear case 3 is closed with respect to the direction in which mud or the like is scattered due to the rotation of the wheel 31, that is, the direction facing the wheel 31 and the direction of rotation of the wheel 31.

As explained above, according to the present invention, since the final case connecting arm portion 39c of the knuckle arm 39 is constituted by the bowl-shaped portion 41, it is advantageous in terms of strength, and the knuckle arm 39 can be made smaller accordingly. The amount of protrusion 11 of the final case 5 from the rim 35 can be reduced.

Further, the gap 1° between the end face of the knuckle arm 39 and the rim 35 becomes large due to the bowl-shaped portion 41, and the gap rapidly expands in an arc shape toward both ends and downward, so that even the minimum gap portion 13 is different from the conventional one. Soil, grass, etc. will slide down naturally without getting stuck.

Furthermore, since the gap C between the connecting arm part 39c between the gear case 3 and the knuckle arm 39 is kept constant by the R2-R construction, there is no extra space, and the gear case 3
Also, the knuckle arm 39 can be configured compactly, and the protrusion amount 11 can be further reduced.

In addition, since the gap C is closed in the direction in which mud, etc. is scattered due to the rotation of the wheel 31, it is ensured that the highly viscous and hard mud that adheres to the rim 35 and is lifted will enter the gap C. This prevents the steering operation from becoming heavier than in the past.

[Brief explanation of the drawing]

Figure 1 is a front view showing the steering wheel according to the present invention;
The figure is a cross-sectional view, FIG. 3 is a plan view, FIG. 4 is a perspective view of the knuckle arm portion, and FIG. 5 is a view showing the knuckle arm. d is a view taken along the arrow d, and e is a sectional view taken along the line ee. FIG. 6 is a plan view of a conventional example, and FIG. 7 is a partial view of its knuckle arm. 1... Steering drive wheel, 2... Axle housing, 3... Gear case, 5...
・Final case, 6... Differential shaft, 7, 17, i9.29... Bevel gear, 10... Upper metal, 20...
... Gear shaft, 27 ... Final shaft, 31 ... Wheel, 39 ... Knuckle arm, 39c ... Final case connecting arm part, 41 ... ...bowl-shaped part, C...
Gap, R□, R2...radius.

Claims (1)

[Scope of utility model registration request] It has a gear case fixed to the axle housing, and a final case rotatably supported by the gear case, and the differential shaft is connected via a bevel gear and a gear shaft that are rotatably supported by each case. In a steering drive wheel having a knuckle arm connected to a final shaft fixing the wheel, rotatably supported by an upper metal fixed to a gear case, and fixed to the final case, the knuckle arm A knuckle in a steering drive wheel, characterized in that the final case connecting arm portion is constituted by a bowl-shaped portion whose inner surface is formed with a radius having a slight gap along the radius of the outer surface shape of the gear case. arm.