In a differential device, even when tooth portions of side gears are placed farther from output shafts due to increase in diameter of the side gears or even when a pinion rotates at high speed, seizure in meshing portions of the pinion and the side gears and a sliding portion of the pinion is preven
In a differential device, even when tooth portions of side gears are placed farther from output shafts due to increase in diameter of the side gears or even when a pinion rotates at high speed, seizure in meshing portions of the pinion and the side gears and a sliding portion of the pinion is prevented effectively. The side gears each include a shaft portion connected to corresponding one of the output shafts, and a flat intermediate wall portion integrally connecting the shaft portion and the tooth portion of the side gear separated outward from the shaft portion in a radial direction of an input member. A through oil passage is formed in the intermediate wall portion of at least one side gear, both ends of the through oil passage being respectively opened in inner and outer side surfaces of the intermediate wall portion.
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1. A differential device which distributively transmits rotational force from an input member to a pair of output shafts via a pair of side gears, the input member supporting a pinion support portion that supports a pinion thereon, the pinion being rotatable together with the pinion support portion,
1. A differential device which distributively transmits rotational force from an input member to a pair of output shafts via a pair of side gears, the input member supporting a pinion support portion that supports a pinion thereon, the pinion being rotatable together with the pinion support portion, the side gears each having a tooth portion in mesh with the pinion in an outer peripheral portion of the side gear, wherein the side gears each include: a shaft portion connected to a corresponding one of the pair of output shafts; andan intermediate wall portion integrally connecting the shaft portion and the tooth portion, the intermediate wall portion separated outward from the shaft portion in a radial direction of the input member and being formed in a substantially flat shape, the differential device further comprising:a cover portion including a side wall portion which covers an outer side surface of at least one of the side gears, and which is connected to the input member so as to rotate integrally with the input member; anda washer installed between an inner side surface of the side wall portion and the outer side surface of the one of the side gears,wherein a through oil passage is formed in the intermediate wall portion of at least one of the side gears, ends of the through oil passage being respectively opened in an inner side surface and an outer side surface of the intermediate wall portion,and wherein an opening of the through oil passage is partially occluded by the washer. 2. The differential device according to claim 1, wherein relative positions of the washer and the through oil passage are set such that at least an inner peripheral portion of the washer faces the opening of the through oil passage opened to the outer side surface of the intermediate wall portion. 3. The differential device according to claim 2, wherein a washer retaining groove, fitting and retaining the washer therein, is formed in at least one of the inner side surface of the side wall portion and the outer side surface of the side gear. 4. The differential device according to claim 2, wherein: the side wall portion includes a weight-reduction portion exposing the outer side surface of the side gear, andan oil guide groove is provided in a recess in the inner side surface of the side wall portion, the oil guide groove being capable of guiding flow of lubricant oil from a peripheral edge of the weight-reduction portion toward the washer and the through oil passage during rotation of the input member. 5. The differential device according to claim 3, wherein the side wall portion includes a weight-reduction portion exposing the outer side surface of the side gear, andan oil guide groove is provided in a recess in the inner side surface of the side wall portion, the oil guide groove being capable of guiding flow of lubricant oil from a peripheral edge of the weight-reduction portion toward the washer and the through oil passage during rotation of the input member. 6. A differential device which distributively transmits rotational force from an input member to a pair of output shafts via a pair of output gears, the input member supporting a differential gear support portion that supports a differential gear thereon, the differential gear being rotatable together with the differential gear support portion, the output gears each having a tooth portion in mesh with the differential gear in an outer peripheral portion of each of the output gears, wherein the pair of output gears each include: a shaft portion connected to a corresponding one of the pair of output shafts; andan intermediate wall portion integrally connecting the shaft portion and the tooth portion, the intermediate wall portion separated outward from the shaft portion in a radial direction of the input member and being formed in a substantially flat shape, the differential device further comprising:a cover portion including a side wall portion which covers an outer side surface of at least one of the side gears, and which is connected to the input member so as to rotate integrally with the input member; anda washer installed between an inner side surface of the side wall portion and the outer side surface of the one of the side gears,wherein a through oil passage is formed in the intermediate wall portion of at least the one of the output gears, both ends of the through oil passage being respectively opened in an inner side surface and an outer side surface of the intermediate wall portion,wherein an opening of the through oil passage is partially occluded by the washer, andwherein d2/PCD≦3.36·(1z1)23·sin(tan-1z1z2) is satisfied, andZ1/Z2>2 is satisfied, where Z1, Z2, d2 and PCD denote the number of teeth of each of the output gears, the number of teeth of the differential gear, a diameter of the differential gear support portion and a pitch cone distance, respectively. 7. The differential device according to claim 6, wherein Z1/Z2≧4 is satisfied. 8. The differential device according to claim 6, wherein Z1/Z2≧5.8 is satisfied. 9. The differential device according to claim 6, wherein relative positions of the washer and the through oil passage are set such that at least an inner peripheral portion of the washer faces the opening of the through oil passage opened to the outer side surface of the intermediate wall portion. 10. The differential device according to claim 6, wherein a washer retaining groove, fitting and retaining the washer therein, is formed in at least one of the inner side surface of the side wall portion and the outer side surface of the output gear. 11. The differential device according to claim 9, wherein the side wall portion includes a weight-reduction portion exposing the outer side surface of the output gear, and an oil guide groove is provided in a recess in the inner side surface of the side wall portion, the oil guide groove being capable of guiding flow of lubricant oil from a peripheral edge of the weight-reduction portion toward the washer and the through oil passage during rotation of the input member. 12. The differential device according to claim 10, wherein the side wall portion includes a weight-reduction portion exposing the outer side surface of the output gear, and an oil guide groove is provided in a recess in the inner side surface of the side wall portion, the oil guide groove being capable of guiding flow of lubricant oil from a peripheral edge of the weight-reduction portion toward the washer and the through oil passage during rotation of the input member. 13. A differential device which distributively transmits rotational force from an input member to a pair of output shafts via a pair of side gears, the input member supporting a pinion support portion that supports a pinion thereon, the pinion being rotatable together with the pinion support portion, the side gears each having a tooth portion in mesh with the pinion in an outer peripheral portion of the side gear, wherein the side gears each include: a shaft portion connected to a corresponding one of the pair of output shafts; andan intermediate wall portion integrally connecting the shaft portion and the tooth portion, the intermediate wall portion separated outward from the shaft portion in a radial direction of the input member and being formed in a substantially flat shape, the differential device further comprising:a cover portion including a side wall portion which covers an outer side surface of at least one of the side gears, and which is connected to the input member so as to rotate integrally with the input member; anda washer installed between an inner side surface of the side wall portion and the outer side surface of the one of the side gears, the washer having a radially inner portion,wherein a through oil passage is formed in the intermediate wall portion of at least one of the side gears, ends of the through oil passage being respectively opened in an inner side surface and an outer side surface of the intermediate wall portion, an opening of the through oil passage being substantially aligned with the washer's radially inner portion,and wherein the washer is operable to reduce or inhibit lubricant oil from flowing outwardly in a radial direction, along a clearance between the inner side surface of the cover portion and the outer side surface of the side gear. 14. The differential device according to claim 13, wherein relative positions of the washer and the through oil passage are set such that at least an inner peripheral portion of the washer faces the opening of the through oil passage opened to the outer side surface of the intermediate wall portion. 15. The differential device according to claim 14, wherein a washer retaining groove, fitting and retaining the washer therein, is formed in at least one of the inner side surface of the side wall portion and the outer side surface of the side gear. 16. The differential device according to claim 14, wherein: the side wall portion includes a weight-reduction portion exposing the outer side surface of the side gear, andan oil guide groove is provided in a recess in the inner side surface of the side wall portion, the oil guide groove being capable of guiding flow of lubricant oil from a peripheral edge of the weight-reduction portion toward the washer and the through oil passage during rotation of the input member.
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