Dual clutch transmission having simplified controls
First Claim
1. A dual clutch transmission (500) having a plurality of forward gears and at least one reverse gear (582) for providing rotational output in two directions and at different gear ratios through a countershaft, said dual clutch transmission (500) comprising:
- a first gear set (570) operatively engaged with a first input shaft (520) by a one-way clutch (594) to provide a first gear;
a plurality of other gear sets (572, 574, 576, 578);
first and second actuators (526) adapted to selectively engage the plurality of other gear sets with either the first input shaft (520) or a second input shaft (522) to selectively provide torque translation through the plurality of forward gears providing second, third, fourth and fifth gears;
the gear sets selectively engaged with the first input shaft by the first actuator providing third and fifth gears, the gear sets selectively engaged with the second input shaft by the second actuator providing second and fourth gears;
a hydraulic circuit (110) having a source of pressurized fluid (112);
a pair of actuator control valves (270, 272) in fluid communication with the source of pressurized fluid (112), said pair of actuator control valves (270, 272) adapted to move said actuators to engage selective ones of the forward gear sets;
a multiplex valve (284) disposed in fluid communication between said pair of actuator control valves (270, 272) and the actuators associated with the forward gears of said transmission and adapted to selectively provide fluid communication to said actuators to thereby select the forward gear ratios; and
a manual valve (185) operatively connected to a gear shift selector (187) and in fluid communication with said source of pressurized fluid (112), said manual valve operable to control a reverse actuator associated with the reverse gear (582) in response to selection of the reverse gear (582) by said gear shift selector (187) to move said actuator into and out of engagement with the reverse gear set to selectively engage the reverse gear with the second input shaft;
wherein only the first and second actuators selectively engage second through fifth gears, only the reverse actuator selectively engages reverse gear; and
only the one-way clutch engages first gear.
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Accused Products
Abstract
A dual clutch transmission (500) having a plurality of forward gears and at least one reverse gear (582) where the first gear is operatively engaged by a one-way clutch (594). A pair of actuator control valves (270, 272) is employed to move actuators to engage selective ones of the forward gear sets. A multiplex valve (284) is disposed in fluid communication between the pair of actuator control valves (270, 272) and the actuators associated with the forward gears of the transmission and is adapted to selectively provide fluid communication to the actuators to thereby select the forward gear ratios. A manual valve (185) is operatively connected to the gear shift selector (187) to control the actuator associated with reverse gear (582).
157 Citations
9 Claims
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1. A dual clutch transmission (500) having a plurality of forward gears and at least one reverse gear (582) for providing rotational output in two directions and at different gear ratios through a countershaft, said dual clutch transmission (500) comprising:
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a first gear set (570) operatively engaged with a first input shaft (520) by a one-way clutch (594) to provide a first gear; a plurality of other gear sets (572, 574, 576, 578); first and second actuators (526) adapted to selectively engage the plurality of other gear sets with either the first input shaft (520) or a second input shaft (522) to selectively provide torque translation through the plurality of forward gears providing second, third, fourth and fifth gears; the gear sets selectively engaged with the first input shaft by the first actuator providing third and fifth gears, the gear sets selectively engaged with the second input shaft by the second actuator providing second and fourth gears; a hydraulic circuit (110) having a source of pressurized fluid (112); a pair of actuator control valves (270, 272) in fluid communication with the source of pressurized fluid (112), said pair of actuator control valves (270, 272) adapted to move said actuators to engage selective ones of the forward gear sets; a multiplex valve (284) disposed in fluid communication between said pair of actuator control valves (270, 272) and the actuators associated with the forward gears of said transmission and adapted to selectively provide fluid communication to said actuators to thereby select the forward gear ratios; and a manual valve (185) operatively connected to a gear shift selector (187) and in fluid communication with said source of pressurized fluid (112), said manual valve operable to control a reverse actuator associated with the reverse gear (582) in response to selection of the reverse gear (582) by said gear shift selector (187) to move said actuator into and out of engagement with the reverse gear set to selectively engage the reverse gear with the second input shaft; wherein only the first and second actuators selectively engage second through fifth gears, only the reverse actuator selectively engages reverse gear; and
only the one-way clutch engages first gear. - View Dependent Claims (2, 3)
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4. A dual clutch transmission comprising:
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a first input shaft (520) with a first gear pinion (570), a third gear pinion (574), and a fifth gear pinion (578) rotatably mounted on the first input shaft; a first input clutch (560) selectively engaging the first input shaft with an engine input shaft (524) to selectively drive the first input shaft; a second input shaft (522) with a reverse gear pinion (582), a second gear pinion (572), and a fourth gear pinion (576) rotatably mounted on the second input shaft; a second input clutch (562) selectively engaging the second input shaft with an engine input shaft (524) to selectively drive the first input shaft; a countershaft (550) selectively driven by the first input shaft and the second input shaft to provide output from the dual clutch transmission; a first actuator (286) selectively engaging the third and fifth gear pinions with the first input shaft; a second actuator (288) selectively engaging the second and fourth gear pinions with the second input shaft; a reverse actuator (300) selectively engaging the reverse gear pinion with the second input shaft; a multiplex valve (284) controlling the first and second actuators, the multiplexing valve shifted between positions to control the first and second actuators by a first clutch actuation valve (124) that supplies pressure to shift the multiplex valve to one position and a second clutch actuation valve (126) that supplies pressure to shift the multiplex valve to another position; wherein the first and second clutch actuation valves also selectively provide pressurized fluid to actuate the first and second input clutches. - View Dependent Claims (5, 6, 7, 8, 9)
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Specification