Transmission
AssigneeZF Friedrichshafen AG
InventorsStefan Beck, Johannes Kaltenbach, Ulrich Kehr, Michael Trubenbach
Life of this patent
Estimating the term…
Abstract
A transmission having a drive input shaft (AN), a drive output shaft (AB), a housing (G), at least two planetary gearsets (PR1, PR2), and at least three shifting elements (A, B, C) whose selective engagement produces various transmission ratios between the drive input shaft (AN) and the drive output shaft (AB), so that at least three gears can be obtained. To obtain a gear in each case, two shifting elements are engaged and a further shifting element is disengaged.
Claims13
A transmission comprising:
- a drive input shaft (AN),
- a drive output shaft (AB),
- a housing (G),
- at least first and second planetary gearsets (PR1, PR2), and each of the at least first and second planetary gearset comprising a sun gear, a carrier and a ring gear,
- at least first, second and third shifting elements (A, B, C), and selective engagement of the at least first, second and third shifting elements (A, B, C) producing various transmission ratios between the drive input shaft (AN) and the drive output shaft (AB) so that at least first, second and third gears are implementable,
- the drive input shaft (AN) and the ring gear (H1) of the first planetary gearset (PR1) being directly connected to one another in a rotationally fixed manner for forming a first shaft (1),
- the drive output shaft (AB) and the carrier (ST1) of the first planetary gearset (PR1) being directly connected to one another in a rotationally fixed manner for forming a second shaft (2),
- the carrier (ST2) of the second planetary gearset (PR2) forming a third shaft (3),
- the ring gear (H2) of the second planetary gearset (PR2) forming a fourth shaft (4),
- the sun gear (S1) of the first planetary gearset (PR1) and the sun gear (S2) of the second planetary gearset (PR2) both being directly connected to one another in a rotationally fixed manner for forming a fifth shaft (5),
- the first shifting element (A) being arranged in a force flow between the third shaft (3) and the housing (G) of the transmission,
- the second shifting element (B) being arranged in a force flow between the second shaft (2) and the fourth shaft (4), and
- the third shifting element (C) being arranged in a force flow between either:
- the third shaft (3) and the fourth shaft (4);
- the fourth shaft (4) and the fifth shaft (5);
- or
- the third shaft (3) and the fifth shaft (5).
A method for operating a transmission comprising a drive input shaft (AN), a drive output shaft (AB), a housing (G), at least first and second planetary gearsets (PR1, PR2), each of the at least first and second planetary gearset comprises a sun gear, a carrier and a ring gear, and at least first, second and third shifting elements (A, B, C) whose selective engagement produces various transmission ratios between the drive input shaft (AN) and the drive output shaft (AB), so that at least first, second and third gears are implementable;
- the ring gear (H1) of the first planetary gearset (PR1) and the drive input shaft (AN) are connected to one another in a rotationally fixed manner for forming a first shaft (1), the carrier (ST1) of the first planetary gearset (PR1) and the drive output shaft (AB) are connected to one another in a rotationally fixed manner for forming a second shaft (2), the carrier (ST2) of the second planetary gearset (PR2) forms a third shaft (3), the ring gear (H2) of the second planetary gearset (PR2) forms a fourth shaft (4), the sun gear (S1) of the first planetary gearset (PR1) and the sun gear (S2) of the second planetary gearset (PR2) are connected to one another in a rotationally fixed manner for forming a fifth shaft (5), the first shifting element (A) is arranged in a force flow between the third shaft (3) and the housing (G) of the transmission, the second shifting element (B) is arranged in a force flow between the second shaft (2) and the fourth shaft (4), and the third shifting element (C) is arranged in a force flow between either the third shaft (3) and the fourth shaft (4), the fourth shaft (4) and the fifth shaft (5), or the third shaft (3) and the fifth shaft (5), the method comprising the step of:
- implementing each of the first, the second and the third gears by engaging two of the first, the second and the third shifting elements and disengaging the other of the first, the second and the third shifting elements.
Dependencies are inferred from the claim text.