A differential assembly for driving a pair of axle shafts includes a drive gear located in a housing and having at least one pair of symmetrically disposed slots formed therein. A pair of differential bushings are located in the housing on opposite sides of the drive gear. A pair of differential car
A differential assembly for driving a pair of axle shafts includes a drive gear located in a housing and having at least one pair of symmetrically disposed slots formed therein. A pair of differential bushings are located in the housing on opposite sides of the drive gear. A pair of differential carriers extend through the drive gear, each carrier having its end portions engaged to notches formed in the differential bushings. The differential carriers further include a center key engaging the slots in the drive gear, whereby the carriers and bushings rotate with the drive gear. The interaction of the bushings with the carriers retains the carriers in engagement with the drive gear.
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What is claimed is: 1. A differential assembly for driving a pair of axle shafts disposed in a housing, the differential assembly comprising: a drive gear comprising a center opening and a first pair of symmetrically disposed slots formed in the center opening, each slot being open to the center op
What is claimed is: 1. A differential assembly for driving a pair of axle shafts disposed in a housing, the differential assembly comprising: a drive gear comprising a center opening and a first pair of symmetrically disposed slots formed in the center opening, each slot being open to the center opening; first and second differential bushings disposed in the housing on opposite sides of the drive gear, each differential bushing comprising a pair of notches formed on an external surface thereof; a first differential carrier extending through the drive gear and comprising a first end portion engaged to one of the pair of notches in the first differential bushing, a second end portion engaged to one of the pair of notches in the second differential bushing, and a center key located between the first end portion and second end portion, the center key engaging one of the first pair of symmetrically disposed slots in the drive gear; and a second differential carrier extending through the drive gear and comprising a first end portion engaged to the other of the pair of notches in the first differential bushing, a second end portion engaged to the other of the pair of notches in the second differential bushing, and a center key located between the first end portion and second end portion, the center key engaging the other of the first pair of symmetrically disposed slots in the drive gear. 2. The differential assembly of claim 1, further comprising a second pair of symmetrically disposed slots formed in the drive gear, a cross shaft engaged to the second pair of symmetrically disposed slots, and a first pair of rotatable bevel gears mounted on the cross shaft. 3. The differential assembly of claim 1, further comprising a second pair of bevel gears, each of the second pair of bevel gears being mounted on one of the axle shafts, and each axle shaft extends through the center of one of the differential bushings. 4. The differential assembly of claim 1, wherein the drive gear is a spur gear driven by a hydrostatic transmission. 5. A differential assembly for driving a pair of axle shafts disposed in a housing, the differential assembly comprising: a drive gear comprising a first pair of symmetrically disposed slots formed therein; first and second differential bushings disposed in the housing on opposite sides of the drive gear, each differential bushing comprising a pair of notches formed therein; a first differential carrier extending through the drive gear and comprising a first end portion engaged to one of the pair of notches in the first differential bushing, a second end portion engaged to one of the pair of notches in the second differential bushing, and a center key located between the first end portion and second end portion, the center key engaging one of the first pair of symmetrically disposed slots in the drive gear; and a second differential carrier extending through the drive gear and comprising a first end portion engaged to the other of the pair of notches in the first differential bushing, a second end portion engaged to the other of the pair of notches in the second differential bushing, and a center key located between the first end portion and second end portion, the center key engaging the other of the first pair of symmetrically disposed slots in the drive gear, wherein each differential carrier comprises a first side portion and a second side portion, and the center key of each differential carrier comprises a first slot formed on the first side portion and a second slot formed on the second side portion. 6. A differential assembly for driving a pair of axle shafts disposed in a housing, the differential assembly comprising: a drive gear; first and second differential carriers, each differential carrier engaged to and extending through the drive gear, whereby both differential carriers rotate with the drive gear; a first differential bushing supported on one of the pair of axle shafts and comprising a first side adjacent a first housing support surface and a second side opposite to the first side, wherein the first differential bushing is maintained in location on the one axle shaft in part by contact between its first side and the first housing support surface, and the first differential bushing is engaged to both of the differential carriers to cause the first differential bushing to rotate with the drive gear; a second differential bushing supported on the other axle shaft and comprising a first side adjacent a second housing support surface and a second side opposite to the first side, wherein the second differential bushing is maintained in location on the other axle shaft in part by contact between its first side and the second housing support surface, and the second differential bushing is engaged to both of the differential carriers to cause the second differential bushing to rotate with the drive gear; and a plurality of bevel gears disposed within an interior opening of the drive gear and between the two differential bushings. 7. The differential assembly of claim 6, further comprising a cross shaft supported by the drive gear, wherein a pair of the plurality of bevel gears is supported on the cross shaft. 8. The differential assembly of claim 6, wherein the drive gear is a spur gear driven by a hydrostatic transmission. 9. The differential assembly of claim 6, wherein the first differential carrier engages to the drive gear by means of a first slot and first mating feature and the second differential carrier engages to the drive gear by means of a second slot and second mating feature. 10. The differential assembly of claim 9, wherein the first and second slots are formed in the drive gear and each differential carrier comprises a key region shaped to fit within its respective slot in the drive gear, whereby the key regions form the first and second mating features. 11. The differential assembly of claim 6, wherein each differential carrier engages to each differential bushing by means of a notch and mating feature. 12. The differential assembly of claim 11, wherein the notches are formed in the differential bushing, and each differential carrier comprises a pair of opposing end portions forming the respective mating features, each end portion being shaped to fit within a respective notch on one of the differential bushings, whereby the end portions form the mating features. 13. The differential assembly of claim 6, wherein each housing support surface comprises an axle bearing engaged to one of the axle shafts and the housing. 14. The differential assembly of claim 13, wherein each housing support surface further comprises a washer disposed between the axle bearing and the bushing. 15. A differential assembly, comprising: a housing; a drive gear disposed in the housing and comprising a center opening; a pair of differential bushings disposed in the housing on opposite sides of the drive gear; and a pair of differential carriers extending through the center opening and driven by the drive gear, each of the pair of differential carriers separately engaged to both differential bushings to cause the differential bushings to be rotatable with the drive gear, wherein the interaction of the pair of differential bushings with the pair of differential carriers retains the differential carriers in engagement with the drive gear. 16. The differential assembly of claim 15, further comprising a cross shaft supported by the drive gear, and a pair of planet bevel gears rotatably supported on the cross shaft. 17. The differential assembly of claim 15, wherein each differential carrier engages to the drive gear by means of a slot and a mating feature engaging the slot. 18. The differential assembly of claim 17, wherein each respective slot is formed in the drive gear and each respective mating feature is a key region formed on each differential carrier. 19. The differential assembly of claim 15, wherein each differential carrier engages to each differential bushing by means of a notch and a mating feature engaging the notch. 20. The differential assembly of claim 19, wherein each respective notch is formed in the differential bushing and each respective mating feature is formed on an end portion of each differential carrier.
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