Drive-force transmitting apparatus for vehicle

1. A drive-force transmitting apparatus for a vehicle, the drive-force transmitting apparatus comprising:

a casing provided with an oil supply hole through which an oil is to be supplied to a lubrication-required element,

wherein the casing is provided with a first guide portion and a second guide portion,

wherein the first guide portion defines a first path that is configured to guide the oil to flow from an upper side of the oil supply hole, toward the oil supply hole, and

wherein the second guide portion defines a second path that is configured to separate the oil flowing along the first path, into a part of the oil and another part of the oil at a portion proximate to a middle portion of the first path in a downward direction of the drive-force transmitting apparatus, and to cause the part of the oil to join with the another part the oil in a position located above the upper side of the oil supply hole,

wherein the first guide portion is constituted by at least a first rib which extends from an inside wall surface of the casing, while the second guide portion is constituted by at least a separating rib which extends from the inside wall surface of the casing,

wherein the first rib is located on an upper side of the oil supply hole and on one of opposite sides, in a horizontal direction of the drive-force transmitting apparatus, of the oil supply hole,

wherein the first rib has a guide surface which faces generally toward the other of the opposite sides of the oil supply hole and which is inclined toward the other of the opposite sides of the oil supply hole in the downward direction of the drive-force transmitting apparatus, such that the oil is to be guided to flow along the guide surface from the upper side of the oil supply hole toward the oil supply hole, and

wherein the separating rib is adjacent to the first rib in the horizontal direction and is located on the upper side of the oil supply hole, the separating rib having an upper end surface that intersects with the guide surface of the first rib in a position corresponding to the middle portion of the first path in which the oil flowing along the first path is to be separated into the part of the oil and the another part of the oil.

2. The drive-force transmitting apparatus according to claim 1 ,

further comprising:

a rotary member that is to be rotated together with drive wheels of the vehicle; and

a mechanical oil pump that is to be driven by the rotary member to discharge the oil that is to be guided to flow from the upper side of the oil supply hole toward the oil supply hole.

3. The drive-force transmitting apparatus according to claim 1 ,

wherein the lubrication-required element is a bearing fitted in an inner peripheral portion of a cylindrical tubular member that is provided with the oil supply hole.

4. The drive-force transmitting apparatus according to claim 1 ,

wherein the upper end surface of the separating rib is inclined upwardly in a direction which is parallel to the horizontal direction and which is away from the guide surface of the first rib.

5. The drive-force transmitting apparatus according to claim 2 ,

wherein the mechanical oil pump is configured to pump out the oil stored in an oil storage that is constituted by a lower portion within the casing,

wherein the drive-force transmitting apparatus further comprises a rotary member that is at least partially immersed in the oil stored in the oil storage, and

wherein the lubrication-required element is a bearing by which the rotary member is rotatably supported.

6. A drive-force transmitting apparatus for a vehicle, the drive-force transmitting apparatus comprising:

a casing provided with an oil supply hole through which an oil is to be supplied to a lubrication-required element,

wherein the casing is provided with a first guide portion and a second guide portion,

wherein the first guide portion defines a first path that is configured to guide the oil to flow from an upper side of the oil supply hole, toward the oil supply hole,

wherein the second guide portion defines a second path that is configured to separate the oil flowing along the first path, into a part of the oil and another part of the oil at a portion proximate to a middle portion of the first path in a downward direction of the drive-force transmitting apparatus, and to cause the part of the oil to join with the another part the oil in a position located above the upper side of the oil supply hole, and

wherein the lubrication-required element is a bearing fitted in an inner peripheral portion of a cylindrical tubular member that is provided with the oil supply hole.

7. The drive-force transmitting apparatus according to claim 6 , further Comprising:

a rotary member that is to be rotated together with drive wheels of the vehicle; and

a mechanical oil pump that is to be driven by the rotary member to discharge the oil that is to be guided to flow from the upper side of the oil supply hole toward the oil supply hole.

8. The drive-force transmitting apparatus according to claim 7 ,

wherein the mechanical oil pump is configured to pump out the oil stored in an oil storage that is constituted by a lower portion within the casing,

wherein the drive-force transmitting apparatus further comprises a rotary member that is at least partially immersed in the oil stored in the oil storage, and

wherein the lubrication-required element is a bearing by which the rotary member is rotatably supported.