JPS5939326B2 - Front axle suspension system for front wheel drive vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a front axle suspension system for a front wheel drive vehicle, such as an agricultural wheel-type tractor, which ensures sufficient ground clearance even in the front wheel drive type, so that it can be used, for example, for straddling ridges in fields, etc. The purpose of the present invention is to provide a margin for the rear wheel tire size, and also to be able to respond to a certain extent when changing the rear tire dimensions.

Recently, in wheel-type tractors for agricultural and civil engineering construction,
2. Description of the Related Art So-called all-wheel drive tractors, which drive both the rear wheels and the front wheels, are attracting attention.

This all-wheel drive tractor uses the vehicle weight effectively, so it can exert a large tractive force and has the advantage of increasing climbing power, but in order to drive the front wheels, it incorporates a front wheel differential or speed reduction device. In this connection, there is a fatal flaw in that the height above the ground is lowered, and as a result, in so-called management work that involves working across ridges in fields, etc., crops are damaged and yields are reduced.

On the other hand, when considering management work, it is sufficient to increase the ground clearance, but when working on level ground, it is advantageous to lower the ground clearance.

This invention has been devised in view of the above-mentioned circumstances, and provides a device that allows the ground clearance to be changed in a front-wheel drive vehicle. This is intended to provide stable support.

Hereinafter, a specific example of the present invention will be described in detail with reference to the drawings. In FIG. 1 showing the overall configuration, 1 is a tractor body, 2 is a front wheel, and 3 is a rear wheel.

4 is the engine, which is mounted at the front of the aircraft.

Reference numeral 5 denotes a transmission case serving as the vehicle body, which is connected to the engine 4 and includes an appropriate transmission mechanism.

The rotational power of the engine 4 is intermittent via a clutch, and can be transmitted to the rear wheels 3 via a transmission mechanism within a transmission case 5.

Reference numeral 6 denotes a gear box, which contains gears for a transmission system for the rear wheels and a selectable change gear, and when these gears are brought into mesh with each other, the propulsion shaft 7 is driven.

The propulsion shaft 7 extends forward along the lower belly of the transmission case 5, and can be freely interlocked with a front wheel differential device.

Referring to FIGS. 2 and 3, details of one end of the front axle 8 are illustrated.

The front axle 8 is provided with a differential device near its center and is swingably suspended from the vehicle body using a so-called center pin system.

The front axle 8 is cylindrical and extends from the differential device into a pair of left and right abutments on both sides.

Inside the front axle 8, a transmission shaft 10 having a bevel pinion 9 fixed to its outer end is supported internally by bearings 8a, etc.
0 is essentially the differential yoke axis.

A first transmission case 11 is fixed to each outer end of the front axle 8 by flange connection or the like.

Reference numeral 12 denotes a second transmission case, in which a front wheel bubble shaft 13 is supported to rotate around a horizontal axis via a bearing 14, and a front wheel disk (not shown) is fixed to a flange 15 of this front wheel bubble shaft 13. Figure 2 1. As shown by II, the transmission shaft 10 and the front wheel hub shaft 13 have approximately the same axis.

Reference numeral 16 denotes a bevel pinion shaft serving as a kingpin, the upper end of which provides first transmission through a thrust bearing 17.

It is pivotally supported by the case 11, with its pinion shaft 16 in a vertical position, and two thrust bearings 1B and 1 at the top and bottom of the lower end.
It is pivotally supported at 9 to the projecting case portion 20 of the second transmission case 12.

A bevel gear 21 that meshes with the bevel pinion 9 from below is spline-coupled to the middle of the pinion shaft 16, and a thrust bearing 22 is provided at the lower end of the gear 21.

A deceleration bevel gear 23 is fixed to the front wheel bub shaft 13.
A bevel gear 24 that meshes with this bevel gear 23 from below is held by the above-mentioned thrust bearings 18 and 19,
A lower end portion of the bevel pinion shaft 16 is splined to the bevel gear 24 .

A lid body 25 is attached to the upper end of the first transmission case 11,
A pin 26 that is coaxial with the bevel pinion shaft 16 protrudes from the lid body 25 .

The upper overhanging case of the second transmission case 12 is held by this pin 26 via a bearing 27, and this overhanging case has a cylindrical portion 28 on the first transmission case side and a mounting seat portion 29 on the second transmission case side. A plurality of mounting seats 29 are formed in the height direction, and are detachable using bolts 30.

That is, a pair of mounting seats 29, which are formed in two stages in the height direction in the figure, project forward and backward as shown in the third figure, and can be fastened with bolts 30 to screw holes 29a formed in the seats 29. 28a is formed in the cylindrical portion 28.

31 is a sealing member sealed in the joint between the first transmission case 11 and the second transmission case 12; 32 is a cylindrical portion that protrudes from the overhanging case portion 20 of the second transmission case 12; It wraps around the bevel pinion shaft 16 and projects into the first transmission case 11 so as to be inserted therein.

4 and 5 show other specific examples of the present invention, in which the mounting seat 29
The holes 29a are continuous in the height direction, and the holes 29a are formed in a continuous manner in the height direction.

The bolt 30 is detachable.

A protruding seat 33 protruding from the cylindrical portion 28 is provided between the front and rear pair of mounting seats 29, 29 and the seat portions 28a, 28a.
The transmission case 12 is provided with a protrusion 34 corresponding to the protrusion 33 so as to face each other at the top and bottom, and the protrusion 33 and 34 are connected by a screw threaded rod 36 with a bundle 35 attached.

Therefore, in the case shown in FIGS. 4 and 5, when the bolt 30 is removed and the bundle 35 is operated in both forward and reverse directions, the threaded rod 3
6 advances in the height direction, and here the first transmission case 11
In contrast, the second transmission case 12 can be changed steplessly in the height direction, and the bolts 30 can be fastened after the adjustment.

In FIGS. 4 and 5, the pair of left and right transmission cases may be moved up and down by operating one of the bundles 35, and the adjustment driving force may be provided by a cylinder.

According to the first embodiment of the present invention shown in FIGS. 1 to 3, when the engine power is transmitted to the rear wheels 3, if the propulsion shaft 7 is also to be linked, the front axle 8 clothed transmission shaft 1
0 is driven.

The power of this transmission shaft 10 is transmitted to the first transmission case 11 and the second transmission case 11.
It is transmitted to the front wheel bub shaft 13 via the deceleration transmission mechanism wrapped in the transmission case 12, and the front wheel 2 is rolled.

That is, the front wheel bub shaft 13 is rotationally driven through the bevel pinion 9 → bevel gear 21 → bevel pinion shaft 16 → bevel gear 24 → reduction gear 23.

Then, when a steering force is applied to the front wheels 2, the second transmission case 12 can freely turn around the vertical axis with the bevel pinion shaft 16 as a kingpin relative to the first transmission case 11. It serves as a steering wheel as well as a drive wheel.

Therefore, when it is necessary to change the ground clearance, each bolt 3
0 is removed and the mounting seats 29 are formed at different positions in the height direction, so that the upper or lower mounting seat 29 corresponds to the seat 28a of the first transmission case 11.
The transmission case 12 is moved in the height direction and fastened again with the bolts 30, which is very advantageous for the following reasons.

That is, a first transmission case 11 containing a built-in bevel transmission device 9° 21 is fixed to the end of the front wheel 8, and the bevel pinion shaft 1
6 is configured as a unit by protruding from the case 11, while the second transmission case 12 is equipped with a speed reducer 24, 23.
built into a unit, the first transmission case 11
and a structure 32 that accommodates the upper and lower opposing portions of the second transmission case 12, and supports the bevel pinion shaft 16 in a removable manner by inserting it into the reduction gear structure 24 of the second transmission case 12.
At the top of the first transmission case 11, there are mounting parts (
A cylindrical part 28) is provided, and this mounting part 28.28 is fixed to a mounting seat part 29 provided on the upper part of the second transmission case 12 with bolts 30 in this example so that the position in the height direction can be changed and fixed. First, remove the bolts 30, move the axle-side unit including the first transmission case 11 and the wheel-side unit including the second transmission case 12 relative to each other in the height direction, fix them again with the bolts 30, and then The axle side unit is supported at both ends at the top and bottom.

Therefore, assuming that the position shown in FIG. 2I is the normal state, if it is installed as shown in FIG.

Note that the height difference in ground clearance can be changed within the range of code H.
In making this change, the height of the cylindrical portion 32 of the second transmission case 12 and the spline connection length Ilj between the bevel pinion shaft j6 and the bevel gear 24 are naturally taken into account.

Furthermore, if the arrangement is as shown in Figures 4 and 5, the ground clearance can be changed steplessly rather than stepwise.

The present invention is as described above, and since the second transmission case can be attached to the first transmission case so as to be freely changeable in the height direction, the ground clearance can be easily changed, and therefore, the front wheel drive Even cars have the advantage of being able to secure the optimal ground clearance according to the work situation, and in this way, the ground clearance of the front wheels can be changed, so even if the rear tires are changed to wider widths, this can be handled. There are advantages that can be achieved.

In addition, the first transmission case on the axle side and the second transmission case on the wheel side each incorporate a transmission device and a reduction gear device as a unit, and the ground clearance can be changed and fixed in the height direction with this unit. It has the advantage that it is easy to change, and that the change does not cause misalignment of the transmission device and reduction gear.

In addition, since both units are supported at the top and bottom, the vertical dimensions can be made small and stable support can be ensured.Also, the adjustment and fixing part at the top can be installed at the front and rear of the axle, making the work extremely easy. There is.

[Brief explanation of the drawing]

FIG. 1 is an overall side view of the tractor, FIGS. 2 I and 2 are sectional views of the main parts of the present invention, that is, enlarged sectional views taken along line A-A in FIG. Partial plan view of FIG. 2 I,
FIG. 4 is an external view of the main parts showing the other side of the present invention, and FIG.
FIG. 1... Truck body, 2... Front wheel, 3
...Rear wheel, 8...Front axle, 10...
...Transmission shaft, 11...First transmission case, 12
．． ,'...Second transmission case, 13...
Front □ Wheel bub shaft, 16.・・・・・・Bevel pinion shaft, 9・
...Bevel pinion, 21.24...Bevel gear, 23...Reduction gear, 28...
・Cylindrical part, 29...Mounting seat part, 30...
·bolt.

Claims (1)

[Claims] 1 A cylindrical front axle having a transmission shaft inside and a first transmission case fixed to both ends; a front wheel bub shaft rotatable around a horizontal axis, and a front wheel shaft rotatable around a vertical axis with respect to the first transmission case; a second transmission case that is rotatably provided at the front wheel; a deceleration transmission mechanism that is surrounded by the first and second transmission cases and transmits the power from the transmission shaft to the front wheel bub shaft at an appropriate speed reduction;
In the above vehicle in which the front axle is suspended from the vehicle body, a transmission device that vertically supports a bevel pinion shaft in a first transmission case fixed to the front axle, projects the pinion shaft below the case, and drives the pinion shaft. built into the unit,
On the other hand, the second transmission case has a built-in speed reduction device and is configured as a unit, the vertical corresponding parts of the first transmission case and the second transmission case have a nested structure, and the bevel pinion shaft is connected to the speed reduction device structure of the second transmission case. At the same time, a mounting part is provided at the front and rear of the axle at the top of the first transmission case, and this mounting part can be fixed and changed in height direction to a mounting seat provided at the top of the second transmission case. A front axle suspension system for a front wheel drive vehicle, characterized in that it is attached to a front axle suspension system for a front wheel drive vehicle.