Differential and moveable power tool having this differential

1 . A differential for a moveable power tool, the differential being constructed to be capable of driving axles mounted on both left and right sides thereof to rotate around an axis of the axles, wherein the differential comprises:

an input mechanism, the input mechanism comprising a main input end and an auxiliary input end that rotate as an integral whole around the axis, a differential shell forming the auxiliary input end, and an outer ring gear for receiving outer movement input, the differential shell comprising a pair of shell halves that abut each other in an axial direction, wherein the outer ring gear is at least partially fixed between the pair of shell halves;

an output gear, the output gear and one of the axles being fixedly engaged in a rotation direction, and the output gear being located between the main input end and the auxiliary input end, wherein the output gear is capable of meshing with the main input end;

a first transmission component, the first transmission component and the output gear being fixedly connected to each other in the rotation direction; and

a second transmission component, the second transmission component and the auxiliary input end being fixedly connected to each other in the rotation direction,

wherein the first transmission component and the second transmission component face each other, and, when meshing of the output gear and the main input end fails, the first transmission component and the second transmission component engage, and the second transmission component in an engaged state drives the first transmission component to rotate in the rotation direction.

2 . The differential according to claim 1 , wherein an axial displacement gap is provided between the first transmission component and the output gear, an elastic member is provided at the axial displacement gap, and, when the meshing of the output gear and the main input end fails, the output gear squeezes the elastic member so that the first transmission component engages with the second transmission component under an elastic force of the elastic member.

3 . The differential according to claim 2 , wherein the elastic member is in a compressed state both when the first transmission component and the second transmission component are in the engaged state and a disengaged state.

4 . The differential according to claim 1 , wherein the first transmission component and the second transmission component form annular plate-shaped structures that are substantially perpendicular to the axis and surround the axis, the second transmission component has a protrusion facing the first transmission component, the first transmission component has a depressed part facing the second transmission component, and, in the engaged state, the protrusion can be located within the depressed part, and a circumferential dimension of the depressed part is greater than a circumferential dimension of the protrusion.

5 . The differential according to claim 4 , wherein the protrusion and the depressed part engage by means of slanted faces to facilitate the protrusion leaving or entering the depressed part.

6 . The differential according to claim 1 , wherein the input mechanism comprises:

a planetary gear system that is located at an axial centre position of the differential shell, the planetary gear system comprising:

the outer ring gear; and

multiple planet gears that are mounted on a radial inner side of the outer ring gear, the multiple planet gears forming the main input end.

7 . The differential according to claim 6 , wherein the multiple planet gears are bevel gears, a self-rotating shaft of each of the planet gears extends in a radial direction, and axial inner end teeth of the output gear also correspondingly forms a bevel gear.

8 . The differential according to claim 7 , wherein the differential further comprises a central assembly member located at the axial centre position thereof, wherein a radial outer end of each of the self-rotating shafts is inserted in a corresponding receiving hole of the outer ring gear, and a radial inner end of each of the self-rotating shafts is inserted in a self-rotating shaft mounting hole of the central assembly member.

9 . The differential according to claim 8 , wherein an axial inner end of one of the driving axles is inserted in the corresponding receiving hole of the central assembly member.

10 . The differential according to claim 1 , wherein the output gear comprises an axial outer section and an axial inner section formed as an integral whole, an outer diameter of the axial outer section being less than an outer diameter of the axial inner section, and both the first transmission component and the second transmission component surrounding the axial outer section.

11 . The differential according to claim 10 , wherein the auxiliary input end forms the differential shell having a stepped construction that is adapted to the shape of the output gear.

12 . The differential according to claim 10 , wherein one of the axles runs through the whole of the output gear and engages with inner teeth of the output gear.

13 . The differential according to claim 1 , wherein the first transmission component and the output gear are fixed in a keying manner, and/or the second transmission component and the auxiliary input end are fixed in a keying manner.

14 . A moveable power tool, wherein the moveable power tool comprises the differential and the axles mounted on both the left and right sides of the differential according to claim 1 .

15 . The moveable power tool according to claim 14 , wherein the moveable power tool is a lawnmower or a snowblower.