JPS6033092Y2 - Kingpin clearance adjustment device for agricultural tractors, etc. - Google Patents

Description

[Detailed description of the invention] This invention relates to a kingpin gap adjustment device for agricultural tractors, civil engineering and construction tractors, etc. (hereinafter referred to as agricultural tractors, etc.). The purpose is to allow the vertical play between the front gear boxes to be adjusted to r''OJ without using shims, and to facilitate readjustment during use.

The front wheel drive portion of a conventional agricultural tractor is as shown in FIG. 1, and numeral 1 is a front first shaft, which is rotatably supported within a front axle case 2 and has a first pinion 3 at its tip.

A front gear case 4 is fixed to the end of the front axle case 2 with a plurality of bolts 5.

Reference numeral 6 denotes a second front shaft, the upper end of which is supported by the upper end of the front gear case 4 via a cover 8 having a bearing 7, and a second pinion 9 fixed to the lower part of the bearing 7 meshes with the first pinion 3 from above. , a third pinion 10 is provided at the lower end portion protruding downward from the front gear case 4, and is supported by the front gear case 4 by a needle bearing 11 above the third pinion 10.

13 is the front gear box, and the lower end is the bearing 1
The downward opening bearing of the king pin support 17 is supported by the boss cylinder part 15 of the third pinion 10 through the pinion 4 and attached to the upper end part through the shim 16. , is supported at upper and lower points of the king pin portion 19 and the bearing 14 so as to be freely rotatable around the vertical axis.

20 is fixed to the front gear box 13 with an oil seal, and the inner circumferential lip is elastically in contact with the outer circumference of the cylindrical portion 22 at the lower end of the front gear case 4.

24 is a front wheel hub spindle, and the end on the side of the front gear case 4 is connected to the front gear box 13 via a bearing 25.
The spindle 24
A final gear 27 is spline-fitted to a middle portion of the entire length of the final gear 27, and a boss cylinder portion 28 of the final gear 27 is supported by the front gear box 13 via a bearing 29 and a bearing case 30.

Note that 31 is a tie rod, and both ends thereof are connected to the left and right front gear cases 4 via joints 32.

Further, 33 is the oil level of lubricating oil.

In this way, the vertical play between the front gear case 4 and the front gear box 13 is adjusted to, for example, 57100 to 0.3 degrees using the conventional shim 16, but due to variations in processing accuracy and assembly accuracy, It is extremely difficult to adjust the play to zero or within a predetermined minute range, and readjustment during use, such as replacing the shim 16 due to wear, requires skill and equipment.

And front gear case 4 and front gear box 1
If the vertical play between 3 and 3 increases, oil seal 2
The inner circumferential lip of 0 travels around the outer circumferential surface of the cylindrical portion 22 as the gear box 13 swings due to the reversing operation, and at the same time slides vertically due to the play, and the oil seal 20 gets caught in mud and dirt. The seal part will wear out and oil will leak.

The present invention allows the vertical position of the front gear box 13 relative to the front gear case 4 to be adjusted using adjustment bolts, and will be described below with reference to the drawings.

In FIG. 2, the cylindrical ma5 of the front gear box 13
is connected to the front gear case cylindrical part 2 via the bearing 36.
The lower end of the second front shaft 6 is supported by the front gear box 13 via a bearing 14 and a cover 37.

34 is a stepped portion, and 43' is a snap ring.

Therefore, the front gear box 13 is supported by the front gear case 4 at two points, upper and lower, with the upper end at the king pin part 19 and the lower end at the bearing 36 part. will not act, only rotational force will act.

Since the second pinion 9 is located next to the front wheel bub spindle 24, the third pinion (10th position) has been lowered, and the diameter of the final gear 27 has increased, but the front gear case of the boss portion 27a of the final gear 27 Since the fourth side end (left end)' is supported via the bearing 25 on the outer periphery of the boss tube 38 that is integrated with the front gear box 13, the final gear 27 is located at the part near the teeth of the boss 27a (
It is supported at two points by the front gear box 13 via bearings 25 and 29, respectively, at the left end (in the figure) and the boss cylinder 28 opposite thereto.

The inner ring of the bearing 25 is fitted and fixed to the outer periphery of the boss tube 38, and the outer ring is fitted and fixed to the inner peripheral surface 39 of the boss portion 27a.

The final gear boss tube 28 is the front wheel bub spindle 24
The boss tube 28 and the spindle 2 are fitted with a spline at the part 40, and the boss tube 28 and the spindle 2 are tightened to the spindle 24 with several bolts 42.
4 are integrated.

The backing plate 41 and the head of the bolt 42 are housed in the space inside the boss cylinder 38, so that the final gear 27 is connected to the spindle 2 within the span h between both bearings 25 and 29.
It is fixed at 4.

43 is a spacer, 44 is an oil seal, 45 is a holding plate,
46 is a presser bolt, and 47 is a front wheel.

In order to regulate the vertical position of the front gear box 13, an adjustment bolt 50 is screwed into the screw hole 49 provided in the king pin support 17, the tip of the bolt 50 is placed against the steel ball 51, and the position of the bolt 50 is adjusted using the nut 52. Fixed.

The steel ball 51 is housed in a seat 53 provided on the king pin portion 19.

The downward vehicle body load that acts on the front wheel 47 from the front axle case 2 side is transferred from the front gear case 4 to the bearing 36.
It acts on the front gear box 13 through the bearing 25 and the final gear 27 from the boss cylinder 38.
The remaining part passes through the bearing case 30, the bearing 29, and the boss cylinder 28, and is supported by the front wheel bub spindle 24.

The rotational force is transmitted from the first front shaft 1 to the first pinion 3, second pinion 9, second front shaft 6, third pinion 10,
It is transmitted to the front wheel bub spindle 24 through the final gear 27.

Front gear box 13 for front gear case 4
If you want to reduce the vertical play between the two by pulling it upwards, loosen the nut 52, insert the adjustment bolt 50 by a predetermined amount, and after adjusting the play, tighten the adjustment bolt 5 with the nut 52.
It is sufficient to fix it to 0.

Since the adjustment bolt 50 is supported on the kingpin part 19 via a steel ball 51, it can be smoothly rotated with respect to the kingpin part 19. Therefore, when the handle is operated, the front gear box 13 is moved along the vertical axis. It can be easily swung around.

As explained above, in the present invention, the cover 8 is fixed to the upper end of the front gear case 4, and the upwardly facing king pin part 19 is integrally provided at the center of the upper surface of the cover 8, and the king pin support at the upper end of the front gear box 13 is attached to the king pin part 19. Fit the bearing hole 48 provided in the upper bottom wall of the bearing hole 48, and screw the adjustment bolt 50 into the threaded hole 49 provided in the upper bottom wall of the bearing hole 48. Since it comes into contact with the end face, in order to adjust the vertical play between the front gear case 4 and the front gear box 13, it is only necessary to loosen the nut 52 and rotate the adjustment bolt 50, making the operation simple. You can adjust the gap accurately.

Furthermore, in the present invention, the front gear box 13 is provided at the lower end of the front gear case 4 via the bearing 36 and the oil seal 20 so as to be rotatable around the vertical axis, so that no vehicle body load acts on the second front shaft 6. On the other hand, since the front gear box 13 is supported by the front gear case 4 via the bearing 36, the lower part of the front gear box 13 is supported rigidly, and the front gear box 13 is attached to a large vehicle body. Even when a load is applied, it does not tilt with respect to the second front shaft 6, and the contact between the adjustment bolt 50 and the steel ball 51 does not change after adjusting the vertical position of the front gear box 13 with respect to the front gear case 4 using the adjustment bolt 50. Therefore, there is an advantage that the optimum state obtained by the adjustment bolt 50 can be stably maintained for a long period of time.

In addition, since the adjustment bolt 50 is in pressure contact with one steel ball 51, even if the front gear box 13 swings back and forth and left and right around the steel ball 51 due to its own deformation or play in various parts, the adjustment will not be possible. The contact between the bolt 50 and the steel ball 51 is maintained constant, and no excessive force is applied to the steel ball 51 or the seat 53.
There is no risk of looseness occurring between the steel balls 51 and the mating member, and the front gear box 13 is fixed relative to the front gear case 4.
The vertical position of can be stably maintained for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing a conventional front wheel drive section, and FIG. 2 is a longitudinal sectional front view of the front wheel drive section according to the present invention. 1...Front first axle, 2...Front axle case, 3...First pinion, 4...
Front gear case, 6...Front 2nd axis,
9...Second pinion, 10...Third pinion, 13...Front gear box, 18
...Bearing hole, 19...King pin part,
24...Front wheel hub spindle, 25.29...
... Bearing, 27 ... Final gear, 27a ... Boss part, 38 ... Boss tube, 49 ... Screw hole, 50 ... ...Adjustment bolt, 51...Steel ball.

Claims (1)

[Scope of utility model registration request] A first front axle 1 supported within a front axle case 1 and having a first pinion main at its tip, a front gear boss fixed to an end of the front axle case 2, and a front axle hub spindle 2.
The front gear box U is supported by the front gear case 4 and is freely movable around the vertical axis via the bearing 36 and the oil seal 11 at the lower end thereof, and the front gear case is supported by the front gear box 13 and meshes with the first pinion L. The second pinion 1 and the front wheel)) The third pinion that meshes with the final gear 27 fixed to the bus spindle 24
From the front second shaft 6 having a pinion 11, the front gear case (mainly the king pin part 1 at the upper end) is fitted with the downward opening bearing hole 1 at the upper end of the gear box U, and the hole is provided at the upper bottom wall of the bearing hole. A kingpin gap adjustment device for an agricultural tractor or the like, characterized in that an adjustment bolt 50 is screwed into a vertical torsion hole 11 and its lower end abuts the upper end of the kingpin part 1 via a spherical shape 51.