Transmission device
Provided is a transmission device including a differential case. The differential case includes at least a part of a contamination pouch. The contamination pouch includes an inlet facing into a body part of the differential case and capable of collecting a contamination in an oil inside the body part. In an inner surface of the differential case, the inlet is arranged in a largest inner diameter part on which a largest centrifugal force acts during rotation of the differential case, or arranged closer to an oil discharging port with respect to the largest inner diameter part in an axial direction.
1. A transmission device comprising:
a transmission case; and
a differential device whose differential case rotates inside the transmission case,
the differential case including:
a body part housing a differential mechanism therein and capable of storing an oil;
an oil introducing port open to a first side in an axial direction of the differential case and capable of introducing the oil inside the transmission case into the body part; and
an oil discharging port open to a second side in the axial direction of the differential case and capable of discharging a stored oil inside the body part into the transmission case, the second side being opposite to the first side in the axial direction,
the differential case comprising at least a part of a contamination pouch including an inlet facing into the body part and capable of collecting a contamination in the oil inside the body part,
in an inner surface of the differential case, the inlet being arranged in a largest inner diameter part on which a largest centrifugal force acts during rotation of the differential case, or arranged closer to the oil discharging port with respect to the largest inner diameter part in the axial direction, and
wherein a peripheral part of the inlet is provided with a protruding part closing a part of the inlet.
2. The transmission device according to claim 1 ,
wherein the differential case is coupled to a carrier of a gear reducer for outputting a rotational force to the differential case, and
wherein the contamination pouch is formed so as to bridge over the carrier and the differential case.
3. The transmission device according to claim 2 ,
wherein the differential mechanism comprises:
paired side gears rotatably supported by the differential case;
two or more pinion gears meshing with the paired side gears; and
a pinion gear support surface formed in an inner surface of the differential case so as to support back surfaces of the two or more pinion gears, and
wherein the pinion gear support surface and the contamination pouch are arranged at respective positions spaced apart from each other in a circumferential direction of the differential case.
4. The transmission device according to claim 2 ,
wherein the oil introducing port has a first diameter, and
wherein the oil discharging port has a second diameter larger than the first diameter.
5. The transmission device according to claim 1 ,
wherein the differential case is coupled to a carrier of a gear reducer for outputting a rotational force to the differential case,
wherein, between the carrier and the differential case, at least the differential case is recessed in the axial direction in a joining surface thereof with respect to the carrier to thereby define the contamination pouch between the carrier and the differential case.
6. The transmission device according to claim 5 ,
wherein the differential mechanism comprises:
paired side gears rotatably supported by the differential case;
two or more pinion gears meshing with the paired side gears; and
a pinion gear support surface formed in an inner surface of the differential case so as to support back surfaces of the two or more pinion gears, and
wherein the pinion gear support surface and the contamination pouch are arranged at respective positions spaced apart from each other in a circumferential direction of the differential case.
7. The transmission device according to claim 5 ,
wherein the oil introducing port has a first diameter, and
wherein the oil discharging port has a second diameter larger than the first diameter.
8. The differential device according to claim 1 ,
wherein the differential case is configured to be divided into first and second cases joined to each other, and
wherein at least a part of the contamination pouch is formed in the first case, and the protruding part is formed in the second case.
9. The transmission device according to claim 8 ,
wherein the differential mechanism comprises:
paired side gears rotatably supported by the differential case;
two or more pinion gears meshing with the paired side gears; and
a pinion gear support surface formed in an inner surface of the differential case so as to support back surfaces of the two or more pinion gears, and
wherein the pinion gear support surface and the contamination pouch are arranged at respective positions spaced apart from each other in a circumferential direction of the differential case.
10. The transmission device according to claim 2 ,
wherein the oil introducing port has a first diameter, and
wherein the oil discharging port has a second diameter larger than the first diameter.
11. The transmission device according to claim 1 ,
wherein the differential mechanism comprises:
paired side gears rotatably supported by the differential case;
two or more pinion gears meshing with the paired side gears; and
a pinion gear support surface formed in an inner surface of the differential case so as to support back surfaces of the two or more pinion gears, and
wherein the pinion gear support surface and the contamination pouch are arranged at respective positions spaced apart from each other in a circumferential direction of the differential case.
12. The transmission device according to claim 1 ,
wherein the oil introducing port has a first diameter, and
wherein the oil discharging port has a second diameter larger than the first diameter.
13. A transmission device comprising:
a transmission case; and
a differential device whose differential case rotates inside the transmission case,
the differential case including:
a body part housing a differential mechanism therein and capable of storing an oil;
an oil introducing port open to a first side in an axial direction of the differential case and capable of introducing the oil inside the transmission case into the body part; and
an oil discharging port open to a second side in the axial direction of the differential case and capable of discharging a stored oil inside the body part into the transmission case, the second side being opposite to the first side in the axial direction,
the differential case comprising at least a part of a contamination pouch including an inlet facing into the body part and capable of collecting a contamination in the oil inside the body part,
in an inner surface of the differential case, the inlet being arranged in a largest inner diameter part on which a largest centrifugal force acts during rotation of the differential case, or arranged closer to the oil discharging port with respect to the largest inner diameter part in the axial direction,
wherein the differential mechanism comprises:
paired side gears rotatably supported by the differential case;
two or more pinion gears meshing with the paired side gears; and
a pinion gear support surface formed in an inner surface of the differential case so as to support back surfaces of the two or more pinion gears, and
wherein the pinion gear support surface and the contamination pouch are arranged at respective positions spaced apart from each other in a circumferential direction of the differential case.
14. The transmission device according to claim 13 ,
wherein the oil introducing port has a first diameter, and
wherein the oil discharging port has a second diameter larger than the first diameter.