JPS6347654B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Generally, when carrying out agricultural work using a tractor, it may be necessary to raise the height of the machine depending on working conditions such as plowing depth or ridge height.

However, in conventional four-wheel drive tractors, the front axle was supported at a constant height by the front axle gear case relative to the drive shaft mounted horizontally at the front of the machine, so it was difficult to change the ground clearance of the front of the machine. was extremely difficult.

The present invention aims to provide a front wheel support device for a four-wheel drive tractor that can perform reliable front wheel drive and also allow the height of the machine body to be changed by extremely simple recombination. , the diagonal shaft is supported across the diagonal shaft case fixed to the center case and the front axle case rotatably supporting the front wheels, and the front axle is connected from the drive shaft supported by the center case via the diagonal shaft. In an agricultural tractor that can transmit power to the front axle and rotate the front axle case around the diagonal shaft to steer the tractor, a cylindrical vertical support section at the bottom of the diagonal shaft case is provided at the lower part of the center case side of the front axle case. A cylindrical hole to be fitted is provided, and a cylindrical receiving part to be fitted to the vertical support part and a vertical support part to be fitted to the cylindrical hole of the axle case are provided at the lower part of the center case side of the auxiliary case. An auxiliary diagonal shaft that interlocks and interlocks the input gear of the axle case is rotatably installed inside the auxiliary case.
A receiving part that overlaps with the lower surface of the base of the steering arm and a receiving part that overlaps with the upper surface of the front axle case are vertically spaced apart, and the front axle case is directly attached to the oblique axle case, and the auxiliary case is The device is characterized in that it is configured so that it can be changed to the attached state through the

The embodiments shown in the drawings will be explained below.
Reference numeral 1 denotes a drive shaft horizontally suspended in a center case 2 provided on the lower surface of the front of the tractor body, and a fulcrum shaft 3 is attached to the upper part of both ends of the center case 2, and bolts 4...
The oblique shaft case 5 is screwed with bolts 6..., and the middle part of the steering arm 7 is rotatably attached to the fulcrum shaft 3 via a bush 8. The oblique shaft 9 is rotatably supported by a bearing 10 and a bush 11 in the oblique shaft case 5, and a bevel gear 12 fitted with a spline on the upper part thereof meshes with a bevel gear 13 fitted with a spline on the drive shaft 1. There is.

14 is a bearing 16,1 in the front axle case 15
6, the front axle 14
A bevel gear 17 spline-fitted to the front axle case 15 meshes with a bevel gear 19 supported by a bearing 18 at the lower part of the front axle case 15.
5 is rotatably inserted and removably inserted into the lower vertical support portion 5a of the oblique shaft case 5 via a bushing 20 at its lower part near the fuselage, and its upper part is fitted into the steering arm 7.
The bevel gear 19 is spline-fitted to the lower end of the oblique shaft 9, and a thrust bearing 22 is interposed between the bevel gear 19 and the lower end of the oblique shaft case 5.

Note that 23 in the drawing is a cover screwed onto the lower end shaft support of the front axle case 15 with bolts 24 .

If the field where the work is to be carried out is in standard conditions, the vehicle will run under the conditions described above.

Next, referring to Figure 2, we will explain the front wheel support device that increases the height of the machine depending on field conditions.
is the receiving part 26 at the outer upper part and then downward by H.
27, and a cylindrical receiving part 28 that fits into the vertical support part 5a on the intermediate part body side, and the lower part is connected to the vertical support part 2.
9, the auxiliary oblique shaft 3 is fitted into the vertical support portion 29 via a bush 30;
1 has splines on the top and bottom, the upper part is connected to the lower part of the oblique shaft 9 by a cylindrical spline joint 32 having splines on the inner peripheral surface, and the lower part is connected to the bevel gear 1.
9 is spline-fitted.

Then, when installing the auxiliary case 25,
In the state shown in FIG. 1, lift and support the front part of the machine, remove the bolts 21, and remove the front axle case 15 from the front axle 14 and bevel gears 17, 1.
9 is attached, and then, as shown in FIG. to wear

At this time, the upper surface of the upper receiving portion 26 is connected to the steering arm 7.
Since they overlap with the lower surface, screw them with the bolts 21 . When the lower part is spline-fitted and pushed up, the outer upper part of the shaft overlaps the lower surface of the receiving part 27 located below the auxiliary case 25, and is then tightened and fixed with bolts 35.

At that time, the lower end of the auxiliary oblique shaft 31 is connected to the bevel gear 19.
Since the drive shaft 1 is pline-fitted to the oblique shaft 9,
Front axle 1 via cylindrical spline joint 32, auxiliary oblique shaft 31 and bevel gears 13, 12, 19, 17
Drive 4.

In the state shown in FIG. 1, the front axle 14 was lower than the drive shaft 1 by an amount h, but after the change shown in FIG. 2, the front axle 14 is lowered by an amount H.

Further, when the steering arm 7 is tilted by the steering shaft, the front axle 14 rotates about the oblique shaft 9 together with the auxiliary case 25 and the front axle case 15.

As described above, the present invention supports the diagonal shaft 9 across the diagonal shaft case 5 fixed to the center case 2 and the front axle case 15 rotatably supporting the front wheels, and is supported by the center case 2. In an agricultural tractor in which power is transmitted from a drive shaft 1 to a front axle 14 via a diagonal shaft 9, and the front axle case 15 can be rotated and steered about the diagonal shaft 9, the center of the front axle case 15 is A cylindrical hole into which the cylindrical vertical support part 5a of the lower part of the oblique shaft case 5 fits is provided at the lower part of the case side, and the center case 2 of the auxiliary case 25
A cylindrical receiving portion 28 that fits into the vertical support portion 5a and a vertical support portion 29 that fits into the cylindrical hole of the axle case 15 are provided at the lower side, and the oblique shaft 9 and the input gear of the axle case 15 are connected to each other. Auxiliary oblique shaft 31 that interlocks
The auxiliary case 25 has a receiving part 2 which overlaps with the lower surface of the base of the steering arm 7 on the outer upper part of the auxiliary case 25.
6 and the receiving part 27 which overlaps with the upper surface of the front axle case 15
are vertically spaced apart from each other so that the front axle case 15 can be attached directly to the diagonal axle case 5 or attached via the auxiliary case 25. Under field conditions, it is possible to perform various normal operations without attaching the auxiliary case, and in fields where it is desirable to raise the machine body, the front axle case must be removed once and the space between the front axle case and the axle case must be removed. By assembling the auxiliary case, the machine can be raised higher and work can be carried out without damaging the crops on the ridge.Moreover, in this case, the machine can be assembled with the same reliability as without the auxiliary case installed. Transmission and steering can be performed.

Furthermore, by preparing an auxiliary case with an auxiliary shaft at the bottom, the axle case and front axle case can be mass-produced as a standard specification that does not raise the front axle case, and can be mass-produced as a standard specification that does not raise the front axle case, or when making a special specification that makes the front axle case higher or already sold. By simply assembling the auxiliary case to the standard specification tractor, the above-mentioned auxiliary case can be easily and easily assembled using the overlapping surface between the steering arm and the front axle case and the upper and lower receiving parts of the auxiliary case, without making any changes to the standard specification parts. It can be assembled or modified to a special specification at low cost, and even if the front axle case is raised, the support of the front wheel will not become unstable, unlike the case where the front axle case slides up and down to expand and contract. The front axle case can be firmly supported via the lower receiving part of the auxiliary case.

[Brief explanation of drawings]

The drawings show one embodiment of the invention,
FIG. 1 is a sectional view of the main parts at a standard machine height, and FIG. 2 is a sectional view of the same with an auxiliary case installed. 1... Drive shaft, 5... Axle case, 9... Oblique shaft, 14... Front axle, 15... Front axle case, 2
5... Auxiliary case, 12, 13, 17, 19...
Bevel gear, 31...auxiliary oblique shaft.

Claims (1)

[Claims] 1 A diagonal shaft 9 is supported across a diagonal shaft case 5 fixed to the center case 2 and a front axle case 15 rotatably supporting the front wheels, and a diagonal shaft 9 is supported from the drive shaft 1 supported by the center case 2. In an agricultural tractor that can transmit power to the front axle 14 via the shaft 9 and steer the front axle case 15 by rotating the front axle case 15 about the diagonal shaft 9, a diagonal is provided at the lower part of the front axle case 15 on the center case side. A cylindrical hole into which the cylindrical vertical support part 5a at the lower part of the axle case 5 fits is provided, and a cylindrical hole 28 which fits into the vertical support part 5a and an axle shaft are provided at the lower part of the auxiliary case 25 on the side of the center case 2. A vertical support portion 29 that is fitted into the cylindrical hole of the case 15 is provided, and an auxiliary diagonal shaft 31 that interlocks and interlocks the diagonal shaft 9 and the input gear of the axle case 15 is rotatably installed inside the outer upper part of the auxiliary case 25. In this case, a receiving part 26 that overlaps with the lower surface of the base of the steering arm 7 and a receiving part 27 that overlaps with the upper surface of the front axle case 15 are vertically spaced apart from each other, and the front axle case 15 is formed into a diagonal axle case. 5. A front wheel support device for a four-wheel drive tractor, characterized in that the front wheel support device for a four-wheel drive tractor can be changed between a state where the front wheel support device is directly mounted on the vehicle and a state where it is mounted via an auxiliary case 25.