Planetary gear transmission systems or components – Differential planetary gearing – Spur gear differential
Patent
1996-01-12
1998-04-07
Ta, Khoi Q.
Planetary gear transmission systems or components
Differential planetary gearing
Spur gear differential
475252, 475160, F16H 145, F16H 5704, B60K 1720
Patent
active
057357650
ABSTRACT:
A differential apparatus (7) comprises: a differential casing (21) rotated by an engine power; a plurality of pinion gears (65, 66) slidably housed in accommodation holes (63, 64) formed in the differential casing: a pair of side gears (35, 37) geared with each other via the pinion gears, two opposing end surfaces thereof being slid relative to other either directly or via a thrust washer (61); and a block member (47, 91, 97) interposed between two inner circumferential surfaces of the two side gears so as to center the side gears, respectively. In particular, at least one oil sump (77, 79; 95; 101) is formed between the block member and the side gears, to supply lubricant to sliding portions between the block member (47, 91, 97) and the side gears (35, 37) and between two opposing end surfaces of the two side gears, by a centrifugal force generated by the rotating differential casing. Further, it is preferable to further form at least one central oil passage (301, 303, 305) at the centering portion (365) so as to extend from an inner circumferential side to an outer circumferential side of the boss portions (357, 359) of the two side gears (353, 355). Further, it is also preferable to form at least two radial oil passages (881, 885; 977, 978) between inner wall surfaces of the differential casing (821, 921) and the side gears (835, 837; 939, 941), respectively in such a way that a radially inward end thereof communicates with the helical oil passage (877, 879; 979L, 979R) and a radially outward end thereof communicates with sliding portion between the side gear and the differential casing, respectively.
REFERENCES:
patent: 4560056 (1985-12-01), Stockton
patent: 5624344 (1997-04-01), Yehl et al.
Aiba Satoshi
Kenji Hiraishi
Ono Shuhei
Teraoka Masao
Ugajin Kazumitsu
Ta Khoi Q.
Tochigi Fuji Sangyo Kabushiki Kaisha
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