Description:Complete Specification

The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed.
Field of the invention
[0001] This invention relates to a lift axle differential that is secured to a wheel assembly of a tractor, wherein the lift axle differential is removably coupled to a plurality of hydraulic lift cylinders of the tractor.

Background surface of the invention
[0002] CN 205951711 U describes a lift axle for a tractor, including the axle casing, install differential mechanism on the axle casing, be equipped with the power shaft of being connected with differential mechanism in the bridge tube of axle casing both sides, the both ends of axle casing are equipped with the side transmission case respectively, the side transmission case includes the casing, the internal movable mounting of epitheca has lower casing, go up the casing and be equipped with the pneumatic cylinder down between the casing, the cylinder body of pneumatic cylinder hinges at last casing, the piston rod hinge of pneumatic cylinder casing under, the lower extreme of casing is equipped with the horizontal drive case down, install wheel hub on the horizontal drive case, the internal integral key shaft of being connected with the power shaft transmission of installing of epitheca, the inferior valve is internal install with integral key shaft complex spline sleeve, the transmission is connected with the wheel hub transmission shaft between spline sleeve and the wheel hub, the internal movable mounting of epitheca has a lower casing, through the pneumatic cylinder can be convenient the change under the relative position of casing and last casing to change down the distance that the casing stretches out the casing, can be convenient adjust the ground surface crack.

Brief description of the accompanying drawing
[0003] Figure 1 illustrates a drawing depicting a lift axle differential that is secured to a wheel assembly of a tractor and is removably coupled to a plurality of hydraulic cylinders of the tractor.
Detailed description of the embodiments
[0004] Figure 1 illustrates a lift axle differential 100 of a tractor. The lift axle differential 100 comprises a lift axle differential member 110, and a first hydraulic lift cylinder 120 positioned on a first side of the lift axle differential member 110 and adapted to raise and lower the lift axle differential member 110. A second hydraulic lift cylinder 130 is positioned on a second side of the lift axle differential member 110 and adapted to raise and lower the lift axle differential member 110. A first wheel 140 is secured to a first end of the lift axle differential member 110 and is adapted to be raised and lowered when the lift axle differential member 110 is raised and lowered respectively. A second wheel 150 is secured to an opposite second end of the lift axle differential member 110 and is adapted to be raised and lowered when the lift axle differential member 110 is raised and lowered respectively.

[00065 Figure 1 illustrates the lift axle differential 100 of a tractor. The lift axle differential 100 comprises a lift axle differential member 110. In an exemplary embodiment, a first hydraulic lift cylinder 120 is positioned on a first side of the lift axle differential member 110 and is adapted to raise and lower the lift axle differential member 110. More specifically, when the first hydraulic lift cylinder 120 is lifted upwardly and downwardly, the first hydraulic lift cylinder 120 that is positioned on the first side of the lift axle differential member 110 is adapted to raise and lower the lift axle differential member 110 respectively. In an exemplary embodiment, a second hydraulic lift cylinder 130 is positioned on an opposite second side of the lift axle differential member 110 and is adapted to raise and lower the lift axle differential member 110. More specifically, when the second hydraulic lift cylinder 130 is lifted upwardly and downwardly, the second hydraulic lift cylinder 130 that is positioned on the opposite second side of the lift axle differential member 110 is adapted to raise and lower the lift axle differential member 110 respectively.

[0006] In an exemplary embodiment, a first wheel 140 is secured to a first end of the lift axle differential member 110. More specifically, the first wheel 140 that is secured to the first end of the lift axle differential member 110 is adapted to be raised and lowered when the lift axle differential member 110 is raised and lowered respectively. When the first end of the lift axle differential member 110 is raised by a pre-determined displacement, the first wheel 140 is raised by a corresponding displacement. Similarly, when the first end of the lift axle differential member 110 is lowered by the pre-determined displacement, the first wheel 140 is lowered by the corresponding displacement until the first wheel is in contact with a ground surface. In an exemplary embodiment, a second wheel 150 is secured to an opposite second end of the lift axle differential member 110. More specifically, the second wheel 150 that is secured to the opposite second end of the lift axle differential member 110 is adapted to be raised and lowered when the lift axle differential member 110 is raised and lowered respectively. When the opposite second end of the lift axle differential member 110 is raised by a pre-determined displacement, the second wheel 150 is raised by a corresponding displacement. Similarly, when the opposite second end of the lift axle differential member 110 is lowered by the pre-determined displacement, the second wheel 150 is lowered by the corresponding pre-determined displacement until the second wheel 150 is in contact with the ground surface.

[0007] In an exemplary embodiment, when the first end of the lift axle differential member 110 is lowered by the pre-determined displacement due to the first hydraulic lift cylinder 120 that is lowered by the pre-determined displacement, the first wheel 140 that is secured to the first end of the lift axle differential member 110 applies a compressive force on the ground surface. The compressive force that is applied by the first wheel 140 that is secured to the first end of the lift axle differential member 110 on the ground surface lifts the tractor when the first hydraulic lift cylinder 120 is lowered towards the ground surface. When the second end of the lift axle differential member 110 is lowered by the pre-determined displacement due to the second hydraulic lift cylinder 130 that is lowered by the pre-determined displacement, the second wheel 150 that is secured to the second end of the lift axle differential member 110 applies a compressive force on the ground surface. The compressive force that is applied by the second wheel 150 that is secured to the second end of the lift axle differential member 110 on the ground surface lifts the tractor when the second hydraulic lift cylinder 130 is lowered towards the ground surface. Therefore, when the first hydraulic lift cylinder 120 and the second hydraulic lift cylinder 130 are lowered by the pre-determined displacement, the compressive forces applied by the first wheel 140 that is secured to the first end of the lift axle differential member 110 and by the second wheel 150 that is secured to the second end of the lift axle differential member 110 on the ground surface in tandem lift the tractor simultaneously upwardly such that the rear wheels of the tractor are no longer in contact with the ground surface. In an exemplary embodiment, the lift axle differential member 110 is removably secured to the first hydraulic lift cylinder 120 and with the second hydraulic lift cylinder 130 respectively. Therefore, when it is not required to lift the tractor upwardly, the lift axle differential member 110 may be decoupled from the first hydraulic lift cylinder 120 and from the second hydraulic lift cylinder 130 respectively.

[0008] A working of the lift axle differential 100 and wheel assembly coupled to the hydraulic cylinders of the tractor is described as an example. When it is required to lift the tractor and consequently the rear wheels of the tractor, the first hydraulic cylinder 120 and the second hydraulic cylinder 130 are each displaced downwardly by a pre-determined displacement in tandem. Therein, the lift axle differential 110 whose first end is secured to the first hydraulic cylinder 120 and whose second end is secured to the second hydraulic cylinder 130 is displaced downwardly by the pre-determined displacement. As the lift axle differential 110 is lowered downwardly by the pre-determined displacement, the first wheel 140 that is secured to the first end of the lift axle differential 110 and the second wheel 150 that is secured to the opposite second end of the lift axle differential 110 are each lowered into the ground surface by the same pre-determined displacement. Therein, the compressive force that is applied by the first wheel 140 and the second wheel 150 on the ground surface causes the tractor to lift upwardly, thereby raising the two rear wheels upwardly. Once the tractor is lifted upwardly such that the two rear wheels are lifted, the tractor can be driven to its destination via the front wheels and the first wheel and second wheel that are secured to the ends of the lift axle differential 110. When it is required to lower the two rear wheels on the tractor on the ground surface, the first hydraulic cylinder 120 and the second hydraulic cylinder 130 are raised upwardly such that the lift axle differential 110 is raised correspondingly. Therefore, the first wheel 140 and the second wheel 150 that are coupled to the ends of the lift axle differential 110 are raised upwardly, thereby lowering the rear wheels of the tractor to the ground surface.

[0009] It must be understood that the embodiments explained above are only illustrative and do not limit the scope of the disclosure. Many modifications in the embodiments with regard to dimensions of various components are envisaged and form a part of this invention. The scope of the invention is only limited by the scope of the claims.
, Claims:
We Claim

1. A lift axle differential (100) for a tractor, said lift axle differential (100) comprising:
a lift axle differential member (110);
a first hydraulic lift cylinder (120) positioned on a first side of said lift axle differential member (110) and adapted to raise and lower said lift axle differential member (110);
a second hydraulic lift cylinder (130) positioned on a second side of said lift axle differential member (110) and adapted to raise and lower said lift axle differential member (110);
a first wheel (140) secured to a first end of said lift axle differential member (110) and adapted to be raised and lowered when said lift axle differential member (110) is raised and lowered respectively; and
a second wheel (150) secured to an opposite second end of said lift axle differential member (110) and adapted to be raised and lowered when said lift axle differential member (110) is raised and lowered respectively.

2. The lift axle differential (100) for a tractor in accordance with Claim 1, wherein said first wheel (140) and said second wheel (150) applies a compressive force on a ground surface, thereby lifting said tractor when said first hydraulic lift cylinder (120) and said second hydraulic lift cylinder (130) are lowered towards the ground surface respectively.

3. The lift axle differential (100) for a tractor in accordance with Claim 1, wherein said lift axle differential member (110) is removably secured to said first hydraulic lift cylinder (120) and said second hydraulic lift cylinder (130) respectively.