Multistep gear
First Claim
Patent Images
1. A multiple-ratio transmission, comprising:
- a front-mounted (VS) connected to an input drive shaft (1);
a rear-mounted (NS) connected to an output drive shaft (2); and
at least six shifting elements (A, B, C, D, E, A′
);
wherein by selectable shifting of a maximum of the six shifting elements (A, B, C, D, E, A′
), an input rotation speed (n) of the input drive shaft (1) and rotation speeds generated in the front-mounted are selectively transferable to the rear-mounted (NS) for selection of at least seven forward speeds and at least one reverse speed, so that only one shifting element, of two shifting elements presently actuated, is disengaged and one further shifting element is engaged to shift from one gear to a next higher or lower gear;
the front-mounted (VS) has one of one front-mounted planetary (VS1) and two coupled front-mounted planetary gear sets (VS1, VS2); and
the rear-mounted (NS) has a two-carrier four-shaft transmission having two shiftable rear-mounted planetary gear sets (NS1, NS2);
a first free shaft of the rear-mounted (NS) is connected to the first shifting element (A) and rotating, when the first shifting element (A) is engaged, at a rotation speed less than or equal to the input rotation speed (n) of the input drive shaft;
a second free shaft of the rear-mounted (NS) is connected at least to the second shifting element (B);
a third free shaft of the rear-mounted (NS) is connected to the fourth shifting element (D) and rotating, when the fourth shifting element (D) is engaged, at a rotation speed less than the input rotation speed (n) of the input shaft (1), the third free shaft of the rear-mounted (NS) is connected to the fifth shifting element (E) and rotating, when the fifth shifting element (E) is engaged, at the input drive rotation speed (n) of the input shaft (1); and
a fourth free shaft of the rear-mounted (NS) is connected to the output drive shaft (2);
the first free shaft of the rear-mounted (NS) is additionally connected to the sixth shifting element (A′
) and rotates, when the sixth shifting element (A′
) is engaged, at a rotation speed less than the input rotation speed (n) of the input drive shaft (1).
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Accused Products
Abstract
A multi-step gear including a drive shaft linked with a non-shiftable front-mounted gear train, an output shaft linked with a shiftable rear-mounted gear train with four free shafts, and shift elements for selective shifting without group shifts. The first free shaft of the rear gear train is linked with a first shift element, the second free shaft with second and third shift elements, the third free shaft with fourth and fifth shift elements and the fourth free shaft with the output shaft. With six shift elements, the first or third free shaft of the rear-mounted gear is additionally linked with a sixth shift element. With seven shift elements, the third free shaft is additionally linked with a sixth shift element and the first free shaft is additionally linked with a seventh shift element.
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Citations
14 Claims
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1. A multiple-ratio transmission, comprising:
-
a front-mounted (VS) connected to an input drive shaft (1); a rear-mounted (NS) connected to an output drive shaft (2); and at least six shifting elements (A, B, C, D, E, A′
);wherein by selectable shifting of a maximum of the six shifting elements (A, B, C, D, E, A′
), an input rotation speed (n) of the input drive shaft (1) and rotation speeds generated in the front-mounted are selectively transferable to the rear-mounted (NS) for selection of at least seven forward speeds and at least one reverse speed, so that only one shifting element, of two shifting elements presently actuated, is disengaged and one further shifting element is engaged to shift from one gear to a next higher or lower gear;the front-mounted (VS) has one of one front-mounted planetary (VS1) and two coupled front-mounted planetary gear sets (VS1, VS2); and the rear-mounted (NS) has a two-carrier four-shaft transmission having two shiftable rear-mounted planetary gear sets (NS1, NS2); a first free shaft of the rear-mounted (NS) is connected to the first shifting element (A) and rotating, when the first shifting element (A) is engaged, at a rotation speed less than or equal to the input rotation speed (n) of the input drive shaft; a second free shaft of the rear-mounted (NS) is connected at least to the second shifting element (B); a third free shaft of the rear-mounted (NS) is connected to the fourth shifting element (D) and rotating, when the fourth shifting element (D) is engaged, at a rotation speed less than the input rotation speed (n) of the input shaft (1), the third free shaft of the rear-mounted (NS) is connected to the fifth shifting element (E) and rotating, when the fifth shifting element (E) is engaged, at the input drive rotation speed (n) of the input shaft (1); and a fourth free shaft of the rear-mounted (NS) is connected to the output drive shaft (2); the first free shaft of the rear-mounted (NS) is additionally connected to the sixth shifting element (A′
) and rotates, when the sixth shifting element (A′
) is engaged, at a rotation speed less than the input rotation speed (n) of the input drive shaft (1). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A multiple-ratio transmission, comprising:
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a front-mounted (VS) connected to an input drive shaft (1); a rear-mounted (NS) connected to an output drive shaft (2); and seven shifting elements (A, B, C, D, E, D′
, A′
);wherein by selectable shifting of a maximum of the seven shifting elements (A, B, C, D, E, D′
, A′
), an input rotation speed (n) of the input drive shaft (1) and rotation spends generated in the front-mounted gearset are selectively transferable to the rear-mounted (NS) for selection of at least seven forward speeds, so that only one shifting element, of two shifting elements presently actuated, is disengaged and one further shifting element is engaged to shift from one gear to a next higher or lower gear;the front-mounted (VS) has one of one front-mounted planetary (VS1) and two coupled front-mounted planetary gear sets (VS1, VS2), and the front-mounted (VS) is directly connected with and continuously driven by the input drive shaft (1); and the rear-mounted (NS) has a two-carrier four-shaft transmission having two shiftable rear-mounted planetary gear sets (NS1, NS2); a first free shaft of the rear-mounted (NS) is connected to the first shifting element (A) and rotating, when the first shifting element (A) is engaged, at a rotation speed less than or equal to the input rotation speed (n) of the input drive shaft; a second free shaft of the rear-mounted (NS) is connected to the second and third shifting elements (B, C); a third free shaft of the rear-mounted (NS) is connected to the fourth shifting element (D) and rotating, when the fourth shifting element (D) is engaged, at a rotation speed less than the input rotation speed (n) of the input shaft (1), the third free shaft of the rear-mounted (NS) is connected to the fifth shifting element (E) and rotating, when the fifth shifting element (E) is engaged, at the input drive rotation speed (n) of the input shaft (1); and a fourth free shaft of the rear-mounted (NS) is connected to the output drive shaft (2); the third free shaft of the rear-mounted (NS) is additionally connected to the sixth shifting element (D′
) and rotates, when the sixth shifting element (D′
) is engaged, at a rotation speed less than the input rotation speed (n) of the input shaft (1), andthe first free shaft of the rear-mounted (NS) is additionally connected to the seventh shifting element (A′
) and rotates, when the seventh shifting element (A′
) is engaged, at a rotation speed, less than the input rotation speed (n) of the input drive shaft (1). - View Dependent Claims (12, 13)
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14. A multiple-ratio transmission, comprising:
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a font-mounted gear set (VS) connected to an input drive shaft (1); a rear-mounted gear set (NS) connected to an output drive shaft (2); and seven shifting elements (A, B, C, D, E, D′
, A′
);wherein by selectable shifting of a maximum of the seven shifting elements (A, B, C, D, E, D′
, A′
), an input rotation speed (n) of the input drive shaft (1) and rotation speeds generated in the front-mounted gear set are selectively transferable to the rear-mounted gear set (NS) for selection of at least seven forward speeds, so that only one shifting element, of two shifting elements presently actuated, is disengaged and one further shifting element is engaged to shift from one gear to a next higher or lower gear;the front-mounted gear set (VS) has one of one front-mounted planetary gear set (VS1) and two coupled front-mounted planetary gear sets (VS1, VS2); and the rear-mounted gear set (NS) has a two-carrier four-shaft transmission having two shiftable rear-mounted planetary gear sets (NS1, NS2); a first free shaft of the rear-mounted gear set (NS) is connected to the first shifting element (A) and rotating, when the first shifting element (A) is engaged, at a rotation speed less than or equal to the input rotation speed (n) of the input drive shaft; a second free shaft of the rear-mounted gear set (NS) is connected to the second and third shifting elements (B, C); a third free shaft of the rear-mounted gear set (NS) is connected to the fourth shifting element (D) and rotating, when the fourth shifting element (D) is engaged, at a rotation speed less than the input rotation speed (n) of the input shaft (1), the third free shaft of the rear-mounted gear set (NS) is connected to the fifth shifting element (E) and rotating, when the fifth shifting element (E) is engaged, at the input drive rotation speed (n) of the input shaft (1); and a fourth free shaft of the rear-mounted gear set (NS) is connected to the output drive shaft (2); the third free shaft of the rear-mounted gear set (NS) is additionally connected to the sixth shifting element (D′
) and rotates, when the sixth shifting element (D′
) is engaged, at a rotation speed less than the input rotation speed (n) of the input shaft (1);the first free shaft of the rear-mounted gear set (NS) is additionally connected to the seventh shifting element (A′
) and rotates, when the seventh shifting element (A′
) is engaged, at a rotation speed less than the input rotation speed (n) of the input drive shaft (1);the first front-mounted planetary gearset (VS1) has a sun wheel (11), a ring gear (13), and two coupled carriers (15′
, 15″
) having inner and outer planet gears (12′
, 12″
);the first rear-mounted planetary gearset (NS1) is a double-planet gear set having a sun gear (31), a ring gear (33), and two coupled carriers (35′
, 35″
) having inner and outer planet gears (32′
, 32″
);the second rear-mounted planetary gear set (NS2) has a sun gear (41), a ring gear (43), and a carrier (45) having planet gears (42); the sun gear (11) of the first front-mounted planetary gear set (VS1) is connected to the input drive shaft (1); the coupled carriers (15′
, 15″
) of the first front-mounted planetary gear set (VS1) are locked;the sun gear (31) of the first rear-mounted planetary gear set (NS1) is connectable via the first shifting element (A) to the input drive shaft (1) and is lockable via the seventh shifting element (A′
), in particular via the carrier (15″
) of the outer planet gears (12″
) of the first front-mounted planetary gear set (VS1);the sun gear (41) of the second rear-mounted planetary gear set (NS2) is connectable via the second shifting element (B) to the ring gear (13) of the first front-mounted planetary gear set (VS1) and is lockable is the third shifting element (C), in particular via the carrier (15″
) of the outer planet gears (12″
) of the first front-mounted planetary gear set (VS1);the carrier (45) of the second rear-mounted planetary gear set (NS2) and the coupled carriers (35′
, 35″
) of the first rear-mounted planetary gear set (NS1) are connected to one another, are connectable via the fourth shifting element (D) to the ring gear (13) of the first front-mounted planetary gear set (VS1), are connectable via the fifth shifting element (E) to the input drive shaft (1), and are lockable via the sixth shifting element (D);the sun gear (31) of the first rear-mounted planetary gear set (NS1) and the ring gear (43) of the second rear-mounted planetary gear set (NS2) are connected to one another; and the ring gear (33) of the first rear-mounted planetary gear set (NS1) is connected to the output drive shaft (3).
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Specification
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Current AssigneeZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
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Original AssigneeZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
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InventorsZiemer, Peter
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Primary Examiner(s)Bonck, Rodney H.
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Assistant Examiner(s)Le, David D.
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Application NumberUS10/473,199Publication NumberTime in Patent Office1,406 DaysField of Search475/271, 475/272, 475/275, 475/276, 475/277, 475/278, 475/296US Class Current475/296CPC Class CodesF16H 2200/003 characterised by the number...F16H 2200/0056 the gear ratios comprising ...F16H 2200/0069 the gear ratios comprising ...F16H 2200/2007 with two sets of orbital gearsF16H 2200/201 with three sets of orbital ...F16H 2200/2012 with four sets of orbital g...F16H 2200/2023 using a Ravigneaux set with...F16H 2200/2097 comprising an orbital gear ...F16H 3/66 composed of a number of gea...F16H 3/663 with conveying rotary motio...F16H 3/666 with compound planetary gea...
