Multistep gear
First Claim
Patent Images
1. A multiple-ratio transmission, comprising:
- a front-mounted gearset (VS) connected to an input drive shaft (1);
a rear-mounted gearset (NS) connected to an output drive shaft (2); and
first, second, third, fourth, fifth, and sixth shifting elements (A, B, D, E, A′
, D′
);
wherein by selectable shifting of the first, second, third, fourth, fifth, and sixth shifting elements (A, B, D, E, A′
, D′
), an input rotation speed (n) of the input drive shaft (1) and rotation speeds generated in the front-mounted gearset (VS) are selectively transferable to the rear-mounted gearset (NS) for the selection of at least seven forward speeds, so that only one shifting element, of the two shifting elements (A, B, D, E, A′
, D′
) 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 gearset (VS) has at least one of a front-mounted planetary gearset (VS1) and two coupled front-mounted planetary gear sets (VS1, VS2); and
the rear-mounted gearset (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 gearset (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 gearset (NS) is connected to the second shifting element (B);
a third free shaft of the rear-mounted gearset (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 gearset (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 gearset (NS) is connected to the output drive shaft (2);
the third free shaft of the rear-mounted gearset (NS) is additionally connected to the fifth shifting element (D′
) and rotates, when the fifth shifting element (D′
) is engaged, at a rotation speed less than the input drive rotation speed (n) of the input shaft (1), andthe first free shaft of the rear-mounted gearset (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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Abstract
The invention relates to a multi-step gear, comprising a drive shaft (1) linked with a front-mounted gear train (VS), an output shaft (2) linked with a rear-mounted gear train (NS), and maximally seven shift elements (A, B, C, D, E, D′, A′) through the selective shifting of which at least seven forward gears can be shifted without group shifts. The front-mounted gear train (VS) is formed by a front-mounted planetary gear (VS1) or maximally two non-shiftable front-mounted planetary gears (VS2) coupled with the first front-mounted planetary gear (VS1). The rear-mounted gear train (NS) is configured as a two-stage/four-shaft transmission with two shiftable rear-mounted planetary gears (NS1, NS2) and four free shafts. The first free shaft of said two-stage/four-shaft transmission is linked with the first shift element (A), the second free shaft with the second and third shift elements (B, C), the third free shaft with the fourth and fifth shift element (D, E) and the fourth free shaft with the output shaft (2). In order to provide a multi-step gear with a total of six shift elements, the third free shaft or the first free shaft of the rear-mounted gear (NS) is additionally linked with a sixth shift element (D′ or A′). In order to provide a multi-step gear with a total of seven shift elements, the third free shaft is additionally linked with a sixth shift element (D′) and the first free shaft is additionally linked with a seventh shift element (A′).
372 Citations
6 Claims
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1. A multiple-ratio transmission, comprising:
-
a front-mounted gearset (VS) connected to an input drive shaft (1); a rear-mounted gearset (NS) connected to an output drive shaft (2); and first, second, third, fourth, fifth, and sixth shifting elements (A, B, D, E, A′
, D′
);wherein by selectable shifting of the first, second, third, fourth, fifth, and sixth shifting elements (A, B, D, E, A′
, D′
), an input rotation speed (n) of the input drive shaft (1) and rotation speeds generated in the front-mounted gearset (VS) are selectively transferable to the rear-mounted gearset (NS) for the selection of at least seven forward speeds, so that only one shifting element, of the two shifting elements (A, B, D, E, A′
, D′
) 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 gearset (VS) has at least one of a front-mounted planetary gearset (VS1) and two coupled front-mounted planetary gear sets (VS1, VS2); and the rear-mounted gearset (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 gearset (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 gearset (NS) is connected to the second shifting element (B); a third free shaft of the rear-mounted gearset (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 gearset (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 gearset (NS) is connected to the output drive shaft (2); the third free shaft of the rear-mounted gearset (NS) is additionally connected to the fifth shifting element (D′
) and rotates, when the fifth shifting element (D′
) is engaged, at a rotation speed less than the input drive rotation speed (n) of the input shaft (1), andthe first free shaft of the rear-mounted gearset (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)
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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)Marmor, Charles A.
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Assistant Examiner(s)Le, David D.
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Application NumberUS11/233,789Publication NumberTime in Patent Office186 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...
