Planetary automatic transmission

Patent metadata

Field	Value
Publication number	US-10759265-B2
Application number	US-201716467251-A
Country	US
Kind code	B2
Filing date	Nov 16, 2017
Priority date	Dec 7, 2016
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

A transmission having five planetary gearsets and seven shift elements for achieving various ratios between drive and output shafts. A forward gearset has three shafts. Two intermediate gearsets have four shafts. Two main gearsets have at least four shafts. Depending on the shift states of the second and third shift elements, the forward gearset can generate two rotational speeds at the output side, which transfer from a forward gearset shaft to an intermediate gearset shaft. Depending on the shift states of the first to fifth shift elements, the intermediate gearset can generate eight rotational speeds at the output side, which pass from another intermediate gearset shaft to a main gearset shaft. Depending on the shift states of the seven shift elements, the main gearset can generate up to fourteen forward and two reverse gears at the output side, which are transferred by another main gearset shaft to the output shaft.

First claim

The invention claimed is:

1. An automatic transmission for a motor vehicle, the automatic transmission comprising:
a transmission housing, a rotary drive shaft and a rotary output shaft;
first, second, third, fourth and fifth planetary gearsets being designed as either a minus or a plus planetary gearset;
first, second, third, fourth, fifth, sixth and seventh shift elements for achieving a plurality of ratios between the rotary drive shaft and the rotary output shaft;
each of the first, the second, the third, the fourth and the fifth planetary gearsets having a first element designed as a sun gear;
each of the first, the second, the third, the fourth and the fifth planetary gearsets, designed as a minus planetary gearset, having a second element designed as a planetary carrier and a third element designed as a ring gear;
each of the first, the second, the third, the fourth and the fifth planetary gearsets, designed as a plus planetary gearset, having a second element designed as a ring gear and a third element designed as a planetary carrier;
the first planetary gearset forming a front-mounted gearset comprising first, second and third front-mounted gearset shafts, the second and the third planetary gearsets forming an intermediate gearset comprising first, second, third and fourth intermediate gearset shafts and the fourth and the fifth planetary gearsets forming a main gearset comprising at least first, second, third and fourth main gearset shafts;
the first front-mounted gearset shaft being permanently connected to the rotary drive shaft and the third front-mounted gearset shaft being connectable to the transmission housing by engaging the third shift element, the second front-mounted gearset shaft being an output shaft of the front-mounted gearset which is permanently connected to the first intermediate gearset shaft and, when the second shift element is engaged, rotates at a rotational speed of the rotary drive shaft such that the front-mounted gearset, depending on shift states of the second and the third shift elements, can generate two different speeds on an output side, and the two different speeds being transmitted from the second front-mounted gearset shaft to the intermediate gearset;
the second intermediate gearset shaft being connectable to the transmission housing, by engaging the fourth shift element, and being connectable to the rotary drive shaft, by engaging the fifth shift element, and the fourth intermediate gearset shaft being connectable to the transmission housing, by engaging the first shift element, the third intermediate gearset shaft is an output shaft of the intermediate gearset which is permanently connected to the first main gearset shaft such that the intermediate gearset, depending on shift states of the first, the second, the third, the fourth and the fifth shift elements can generate eight different speeds on an output side, and the eight different speeds being transmitted to the main gearset via the third intermediate gearset shaft; and
the second main gearset shaft being permanently connected to the rotary drive shaft or connectable to the rotary drive shaft by engaging the seventh shift element, the fourth main gearset shaft being connectable to the transmission housing, by engaging the sixth shift element, and the third main gearset shaft is an output shaft of the main gearset which is permanently connected to the rotary output shaft.

2. An automatic transmission for a motor vehicle, the automatic transmission comprising:
a transmission housing, a rotary drive shaft and a rotary output shaft;
first, second, third, fourth and fifth planetary gearsets;
first, second, third, fourth, fifth, sixth and seventh shift elements for achieving different transmission ratios between the rotary drive shaft and the rotary output shaft,
each of the first, the second, the third, the fourth and the fifth planetary gearsets having a first element configured as a sun gear;
each of the first, the second, the third, the fourth and the fifth planetary gearsets, which are designed as a minus planetary gearset, having a second element designed as a planetary carrier and a third element designed as a ring gear;
each of the first, the second, the third, the fourth and the fifth planetary gearsets, which are designed as a plus planetary gearset, having a second element designed as a ring gear and a third element designed as a planetary carrier;
the first planetary gearset forming a front-mounted gearset comprising first, second and third front-mounted gearset shafts, the second and the third planetary gearsets forming an intermediate gearset comprising first, second, third and fourth intermediate gearset shafts, and the fourth and the fifth planetary gearsets forming a main gearset comprising at least first, second, third and fourth main gearset shafts;
the first front-mounted gearset shaft being connectable to the rotary drive shaft, by engaging the third shift element, and the third front-mounted gearset shaft being permanently connected to the transmission housing, the second front-mounted gearset shaft is an output shaft of the front-mounted gearset which is permanently connected to the first intermediate gearset shaft, and, when the second shift element is engaged, the second front-mounted gearset shaft rotates at a rotational speed of the rotary drive shaft such that the front-mounted gearset, depending on shift states of the second and the third shift elements, can generate two different speeds on an output side, and the two different speeds being transmitted from the second front-mounted gearset shaft to the intermediate gearset;
the second intermediate gearset shaft being connectable to the transmission housing, by engaging the fourth shift element, and being connectable to the rotary drive shaft, by engaging the fifth shift element, the fourth intermediate gearset shaft being connectable to the transmission housing, by engaging the first shift element, and the third intermediate gearset shaft is an output shaft of the intermediate gearset which is permanently connected to the first main gearset shaft such that the intermediate gearset, depending on the shift state of the first, the second, the third, the fourth and the fifth shift elements, can generate eight different speeds on an output side, and the eight different speeds being transmitted to the main gearset, via the third intermediate gearset shaft; and
the second main gearset shaft being permanently connected to the rotary drive shaft or being connectable to the rotary drive shaft, by engaging the seventh shift element, the fourth main gearset shaft being connectable to the transmission housing, by engaging the sixth shift element, and the third main gearset shaft is an output shaft of the main gearset which is permanently connected to the rotary output shaft.

3. The automatic transmission according to claim 1 , wherein the main gearset has exactly the first, the second, the third and the fourth main gearset shafts, and the second main gearset shaft is connectable to the rotary drive shaft by engaging the seventh shift element.

4. The automatic transmission according to claim 3 , wherein the first element of the fourth planetary gearset and the first element of the fifth planetary gearset are permanently interconnected and form the first main gearset shaft, and the second element of the fifth planetary gearset forms the second main gearset shaft;
the second element of the fourth planetary gearset and the third element of the fifth planetary gearset are permanently interconnected and form the third main gearset shaft, and the third element of the fourth planetary gearset forms the fourth main gearset shaft.

5. The automatic transmission according to claim 3 , wherein the first element of the fifth planetary gearset forms the first ma

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Ziemer Peter
• Bornträger Kai
• Margraf Christoph
• Brom Stefan
• Beisswenger Andreas
• Trübenbach Michael
• Glückler Johannes

Classifications

• F16H2003/442

  comprising two or more sets of orbital gears arranged in a single plane · CPC title

• F16H2200/2023

  using a Ravigneaux set with 4 connections · CPC title

• F16H2200/0078

  the gear ratio comprising twelve or more forward speeds · CPC title

• F16H3/666

  with intermeshing orbital gears (F16H3/663 takes precedence) · CPC title

• F16H2200/0026

  comprising at least one creep low gear, e.g. additional gear for extra low speed or creeping · CPC title