EP0248582A2
Expired / Lapsed
EP
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Differential gear
Assignee: Toyota Motor Corp
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Filing: 1987-05-26
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Granted: —
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Expires: 2007-05-26
Abstract
Abstract A differential gear (30) includes a rotatable case (32), pinions (34) rotatably disposed in the case (32), a pair of side gears (36) meshing with the pinions (34) and disposed in the case (32), a first shaft (44) supported rotatably about a rotary axis of the case (32) and extending from one of side gears (36), a second shaft (48) supported rotatably about the axis and extending from the other side gear (36) in the opposite direction to the first shaft, a first driven gear (50) provided in one of the first and second shafts (44,48), a first drive gear (98) for rotating the driven gear (50) to transmit driving force to the first and second shafts (44,48). A worm wheel (52) fixed to the case (32), a worm (55) meshing with the worm wheel (52) and an electric motor (56) are provided. The motor (56) is controlled by a control device (106) so as to maintain the difference between numbers of revolutions of the first and second shafts (44,48) within a predetermined range.
Inventors
- 👤 Hitoshi Azuma
- 👤 Kentaro Tomo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 21:10
CPC Classifications
F; F16; F16H; F16H48/00; F16H48/20; F16H48/30; B; B60; B60K; B60K17/00; B60K17/04; B60K17/16; B60K17/20; B60K17/34; B60K17/344; B60K17/346; B60K17/3462; B60K23/00; B60K23/04; B60K23/08; B60K23/0808; F16H48/06; F16H48/08; F16H48/36; F16H59/00; F16H59/50; F16H59/58; F16H2048/204; F16H2048/205; F16H2048/364; F16H48/38; F16H48/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
178 words
A differential gear comprising: a rotatable case (32); pinions (34) disposed rotatably in the case (32): a pair of side gears (36) disposed rotatably in said case (32) to mesh with the pinions (34); a first shaft (44) supported rotatably about a rotary axis of said case (32) and extending from one of said side gears (36); a second shaft (48) supported rotatably about said rotary axis and extending from the other side gear (36) in the opposite direction to said first shaft (44); a driven means (50,74) provided in one of the first and second shafts (44,48); a first means (78,98,134) for rotating the driven means (50,74) to transmit driving force to said first and second shafts (44,48); a worm wheel (52) provided in said case (32); a second rotary means (54) having a worm (55) meshing with the worm wheel (52); and a control device (106) for calculating on the basis of signals from a steering angle sensor (108) and a vehicle speed sensor (110) to control number of revolutions of said second rotary means (54).
Claim 2
Dependent Claim
178 words
A differential gear comprising: a rotatable case (32); pinions (34) disposed rotatably in the case (32): a pair of side gears (36) disposed rotatably in said case (32) to mesh with the pinions (34); a first shaft (44) supported rotatably about a rotary axis of said case (32) and extending from one of said side gears (36); a second shaft (48) supported rotatably about said rotary axis and extending from the other side gear (36) in the opposite direction to said first shaft (44); a driven means (50,74) provided in one of the first and second shafts (44,48); a first means (78,98,134) for rotating the driven means (50,74) to transmit driving force to said first and second shafts (44,48); a worm wheel (52) provided in said case (32); a second rotary means (54) having a worm (55) meshing with the worm wheel (52); and a control device (106) for calculating on the basis of signals from a steering angle sensor (108) and a vehicle speed sensor (110) to control number of revolutions of said second rotary means (54).
Claim 3
Dependent Claim
41 words
A differential gear as claimed in claim 1, wherein said control device (106) controls the second rotary means (54) so as to maintain the difference between the numbers of revolutions of said first and second shafts (44,48) within a predetermined range.
Claim 4
Dependent Claim
37 words
A differential gear as claimed in claim 2, wherein an electric motor (56) is included in said second rotary means (54) and rotated at the number of revolutions slight higher than the theoretical value obtained by calculation.
Claim 5
Dependent Claim
83 words
A differential gear as claimed in claim 1, wherein the differential gear (30) is disposed between front and rear propeller shafts (94,96) and used for a center differential gear in a four wheel drive car, and wherein the shaft (44) provided with the driven means (50) is connected to the front propeller shaft (94), whereby said second rotary means (54) is controlled at the time of turning of the car so as to reduce number of revolutions of the rear propeller shaft (96).
Claim 6
Dependent Claim
76 words
A differential gear as claimed in claim 1, wherein the differential gear (30) is disposed between right and left drive shafts (118,124), and wherein one of said first and second shafts (44,48) is connected to one of the right and left drive shafts (118,124) through a gear train (116,120) and the other of the first and second shafts is connected to the other of the right and left drive shafts (118,124) through a transmitting device (122,126,128).
Claim 7
Dependent Claim
28 words
A differential gear as claimed in claim 1, wherein further comprises an auxiliary gear device (80) provided in relation to one of the first and second shafts (44,48).
Claim 8
Dependent Claim
48 words
A differential gear as claimed in claim 6, wherein said auxiliary gear device (80) includes a non-rotatable case (38), pinions (84) disposed rotatably in the non-rotatable case (38) and a pair of side gears (88) disposed rotatably in said non-rotatable case (38) to mesh with the pinions (84).
Claim 9
Dependent Claim
172 words
A differential gear comprising: a rotatable case (32); pinions (34) disposed rotatably in the case (32); a pair of side gears (36) disposed rotatably in said case (32) to mesh with the pinions (34); a first shaft (44) supported rotatably about a rotary axis of said case (32) and extending from one of said side gears (36); a second shaft (48) supported rotatably about said rotary axis and extending from the other side gear (36) in the opposite direction to said first shaft (44); a driven means (62) provided in said case (32); a first means for rotating the driven means (62) to transmit driving force to said first and second shafts (44,48); a worm wheel (66) provided in one of the first and second shafts (44,48); a second rotary means having a worm (68) meshing with the worm wheel (66); and a control device for calculating on the basis of signals from a steering angle sensor and a vehicle speed sensor to control number of revolutions of said second rotary means.
Claim 10
Dependent Claim
172 words
A differential gear comprising: a rotatable case (32); pinions (34) disposed rotatably in the case (32); a pair of side gears (36) disposed rotatably in said case (32) to mesh with the pinions (34); a first shaft (44) supported rotatably about a rotary axis of said case (32) and extending from one of said side gears (36); a second shaft (48) supported rotatably about said rotary axis and extending from the other side gear (36) in the opposite direction to said first shaft (44); a driven means (62) provided in said case (32); a first means for rotating the driven means (62) to transmit driving force to said first and second shafts (44,48); a worm wheel (66) provided in one of the first and second shafts (44,48); a second rotary means having a worm (68) meshing with the worm wheel (66); and a control device for calculating on the basis of signals from a steering angle sensor and a vehicle speed sensor to control number of revolutions of said second rotary means.
References Cited (Backward Citations)
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