DE102008016084A1 - Eight-speed automatic transmission has five torque-transmitting clutches that are engageable to the gears, carriers and transmission housing in combinations of three to establish eight forward speed ratios and one reverse speed ratio - Google Patents

Abstract

Four planetary gear sets (14,16,18,20) are used. One interconnecting shaft (42) interconnects the ring gear (14C) of first set with the planet carrier (18C) of third set. The second shaft (44) interconnects the sun gears (16B,18B) of second and third sets. The third shaft (46) interconnects the sun gear of third set with the ring gear (20B) of fourth set. Five torque-transmitting clutches are engageable to the gears, carriers and transmission housing (50) in combinations of three to establish eight forward speed ratios and one reverse speed ratio between input shaft (12) and output shaft (22).

Description

CROSS-REFERENCE TO RELATED REGISTRATIONS

These Registration claims the priority of the provisional U.S. Application No. 60 / 909,576, filed April 2, 2007. The disclosure of the above application is incorporated herein by reference recorded with.

TERRITORY

The The invention relates generally to a multi-speed automatic transmission that multiple planetary gear sets and multiple torque transmitting devices and, more specifically, an eight-speed automatic transmission that has four planetary gear sets and multiple torque transmitting clutches and brakes having.

BACKGROUND

The Statements in this section merely provide background information, which are and can be related to the present disclosure State of the art form or not.

One typical multi-speed automatic transmission uses a combination of Friction clutches, planetary gear arrangements and fixed connections, to achieve multiple gear ratios. The number and physical arrangement of the planetary gear sets In general, the space, the costs and the desired Speed ratios or gears prescribed.

Although current automatic transmissions their intended purpose meet the need for new and improved transmission configurations, the improved performance, in particular of the viewpoints of efficiency, the response and quiet operation, as well as an improved space, primarily reduced size and reduced Weight, show, essentially constant. Accordingly there There is a need for an improved, cost effective, compact More speed automatic transmission.

SUMMARY

It an automatic transmission is provided, which is a drive element, a Output element, four planetary gear sets, several coupling elements and a plurality of torque transmitting devices. Each of the planetary gear sets includes a first, second and third element. The torque transmission devices can be either clutches or brakes.

A Embodiment of the transmission of the present invention comprises a drive element, an output element and a first, second, third and fourth planetary gear sets, each a sun gear, a carrier and a ring gear, wherein the drive element constantly with the sun gear of the first planetary gear set and the carrier of the second planetary gear set is and the output element constantly with the carrier the fourth planetary gear set is connected. A first connection element connects the ring gear of the first planetary gear set constantly with the carrier of the third planetary gear set. A second Connection element connects the sun gear of the second planetary gear set constantly with the sun gear of the third planetary gear set. A third connecting element connects the ring gear of the third Planetary gear set constantly with the sun gear of the fourth Planetary gear set. A first torque transmitting device is selectively engageable to the sun gear of the second planetary gear set and / or the sun gear of the third planetary gear set with the carrier to connect the first planetary gear set. A second torque transmitting device is selectively engageable to the ring gear of the second planetary gear set with the carrier of the fourth planetary gear set and / or the output element connect to. A third torque transmitting device is selectively engageable to the sun gear of the third planetary gear set and / or the sun gear of the second planetary gear set with the ring gear of the third planetary gear set and / or the sun gear of the fourth To connect planetary gear set. A fourth torque transmitting device is selectively engageable to the wearer of the first To connect planetary gear set with a fixed element. A fifth torque transmitting device is selective engageable to the ring gear of the fourth planetary gear set to connect with the fixed element. The torque transmission devices are selectively engageable in combinations of at least three, by at least eight forward gears and at least a reverse gear between the drive element and produce the output element.

Another embodiment of the transmission of the present invention includes a drive member, an output member, and first, second, third, and fourth planetary gear sets each having a sun gear, a carrier, and a ring gear, the drive member being continuously connected to the carrier of the first planetary gear set and the ring gear the second planetary gear set is connected and the output member is constantly connected to the carrier of the fourth planetary gear set. A first connecting element connects the sun gear of the first planetary gear set constantly with the carrier of the third planetary gear set. A second connecting element connects the sun gear of the second tarpaulin tenradsatzes constantly with the sun gear of the third planetary gear set. A third connecting element connects the ring gear of the third planetary gear set constantly with the sun gear of the fourth planetary gear set. A first torque transmitting device is selectively engageable to interconnect the ring gear of the first planetary gear set with the carrier of the second planetary gear set. A second torque transmitting device is selectively engageable to interconnect the sun gear of the second planetary gear set and / or the sun gear of the third planetary gear set with the ring gear of the first planetary gear set. A third torque transmitting device is selectively engageable to interconnect the carrier of the fourth planetary gear set and / or the output element with the carrier of the second planetary gear set. A fourth torque transmitting device is selectively engageable to interconnect the sun gear of the first planetary gear set and / or the carrier of the third planetary gear set with a stationary member. A fifth torque transmitting device is selectively engageable to interconnect the ring gear of the fourth planetary gear set with the stationary member. The torque transmitting devices are selectively engageable in combinations of at least three to produce at least eight forward gears and at least one reverse gear between the input member and the output member.

A Yet another embodiment of the transmission of the present invention The invention comprises a drive element, an output element and a first, second, third and fourth planetary gear sets, respectively a sun gear, a carrier and a ring gear, wherein the Antriebsele ment constantly with the ring gear of the first Planetary gear and the carrier of the second planetary gear set is connected and the output element constantly with the ring gear of fourth planetary gear set is connected. A first connection element connects the sun gear of the first planetary gear set constantly with the sun gear of the third planetary gear set. A second connecting element connects the sun gear of the second planetary gear set constantly with the ring gear of the third planetary gear set. A third connecting element connects the carrier of the third planetary gear set constantly with the carrier of the fourth planetary gear set. A first Torque transmission device is selectively engageable, to the ring gear of the second planetary gear set with the sun gear of third planetary gear set and / or the sun gear of the first planetary gear set connect to. A second torque transmitting device is selectively engageable to the ring gear of the second planetary gear set to connect with the carrier of the first planetary gear set. A third torque transmitting device is selective engageable to the ring gear of the fourth planetary gear set and / or the output element with the carrier of the first To connect planetary gear set. A fourth torque transmitting device is selectively engageable to the sun gear of the second planetary gear set and / or the ring gear of the third planetary gear set with a fixed Element to connect. A fifth torque transmitting device is selectively engageable to the sun gear of the fourth planetary gear set to connect with the fixed element. The torque transmission devices are selectively engageable in combinations of at least three, by at least eight forward gears and at least a reverse gear between the drive element and produce the output element.

Further Objects and advantages of the present invention are made by reference to the following description and the accompanying Zeichnun conditions clear in which the same reference numbers refer to the same component, Reference element or feature.

DRAWINGS

The Drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure to any Limit the way.

1 Fig. 10 is a lever diagram of a first embodiment of an eight-speed automatic transmission according to the present invention;

2 Fig. 12 is a schematic view of the first embodiment of an eight-speed automatic transmission according to the present invention;

3 is a truth table showing the state of engagement of the various torque transmitting clutches and brakes in each of the available forward and reverse speeds or gear ratios of FIG 1 and 2 illustrated automatic transmission represents;

4 Fig. 11 is a lever diagram of a second embodiment of an eight-speed automatic transmission according to the present invention;

5 Fig. 10 is a schematic view of the second embodiment of an eight-speed automatic transmission according to the present invention;

6 is a truth table showing the state of engagement of the various torque transmitting clutches and brakes in each of the available forward and reverse speeds or gear ratios of FIG 4 and 5 illustrated automatic transmission sets;

7 Fig. 13 is a lever diagram of a third embodiment of an eight-speed automatic transmission according to the present invention;

8th Fig. 12 is a schematic view of the third embodiment of an eight-speed automatic transmission according to the present invention; and

9 is a truth table showing the state of engagement of the various torque transmitting clutches and brakes in each of the available forward and reverse speeds or gear ratios of FIG 7 and 8th represents illustrated automatic transmission.

DETAILED DESCRIPTION

The The following description is merely exemplary in nature and is intended to be not limit the present disclosure, application or uses.

To Beginning is to be noted that provided in the particular Example of the eight-speed automatic transmission of the present invention an arrangement of permanent mechanical connections between having the elements of the four planetary gear sets. These permanent mechanical connections relate to the transmission embodiments.

More accurate is a first component or element of a first planetary gear set permanently with a first component or element of a second planetary gear set coupled. A third component or element of the first planetary gear set is permanent with a third component or element of a third planetary gear set coupled. A second component or element of the second planetary gear set is permanent with a second component or element of the third Coupled planetary gear set. Finally, a first Component or element of the third planetary gear set permanently a first component or element of a fourth planetary gear set coupled.

Now referring to 1 is a first embodiment of an eight-speed automatic transmission 10 illustrated in a lever diagram format. A lever diagram is a schematic representation of the components of a mechanical device, such as an automatic transmission. Each individual lever represents a planetary gear set, wherein the three basic mechanical components of the planetary gear set are each represented by a node. Therefore, a single lever includes three nodes: one for the sun gear, one for the planet carrier, and one for the ring gear. The relative length between the nodes of each lever can be used to represent each of the ring gear / sun gear ratio of the respective gear set. These levers are in turn used to vary the gear ratios of the transmission to achieve appropriate ratios and suitable ratio progression. Mechanical couplings or connections between the nodes of the various planetary gear sets are illustrated by thin horizontal lines, and torque transmitting devices such as clutches and brakes are shown as interdigitated fingers. If the device is a brake, a set of fingers is grounded. A further explanation of the format, purpose and use of lever diagrams is in the document SAE Paper 810102, "The Lever Analogy: A New Tool in Transmission Analysis" Genford and Leising, the disclosure of which is hereby incorporated by reference in its entirety.

The automatic transmission 10 includes a drive shaft or a drive element 12 , a first planetary gear set 14 with three nodes: a first node 14A , a second node 14B and a third node 14C , a second planetary gear set 16 with three nodes: a first node 16A , a second node 16B and a third node 16C , a third planetary gear set 18 with three nodes: a first node 18A , a second node 18B and a third node 18C , a fourth planetary gear set 20 with three nodes: a first node 20A , a second node 20B and a third node 20C and an output shaft or an output member 22 , The first node 14A of the first planetary gear set 14 is with the first node 16A of the second planetary gear set 16 coupled. The third node 14C of the first planetary gear set 14 is with the third node 18C of the third planetary gear set 18 coupled. The second node 16B of the second planetary gear set 16 is with the second node 18B of the third planetary gear set 18 coupled. The first node 18A of the third planetary gear set 18 is with the first node 20A of the fourth planetary gear set 20 coupled.

The drive shaft or the drive element 12 is with the first node 14A of the first planetary gear set 14 coupled. The output shaft or the output element 22 is with the third node 20C of the fourth planetary gear set 20 coupled. A first clutch 26 connects the second node 14B of the first planetary gear set 14 selectively with the second node 16B of the second planetary gear set 16 , A second clutch 28 connects the third node 16C of the second planetary gear set 16 selectively with the third node 20C of the fourth planetary gear set 20 and with the output shaft or the output member 22 , A third clutch 32 connects the second node 18B of the third plane gear set 18 selectively with the first node 20A of the fourth planetary gear set 20 , A first brake 36 connects the second node 14B of the first planetary gear set 14 selectively with ground, the fixed element, or the transmission housing 40 , A second brake 38 connects the second node 20B of the fourth planetary gear set 20 selectively with ground, the fixed element, or the transmission housing 40 ,

Now referring to 2 1 is a schematic diagram of a schematic layout of the first embodiment of the eight-speed transmission 10 in accordance with the present invention 2 the numbering is taken from the lever diagram of 1 accepted. The clutches, brakes and couplings are shown accordingly, whereas the nodes of the planetary gear sets 14 . 16 . 18 and 20 now appear as components of planetary gear sets, such as sun gears, ring gears and planetary gears with planetary gears.

For example, the transmission includes 10 the drive shaft or the drive element 12 that with the first sun 14A of the first planetary gear set 14 coupled and drives this directly. An extension of the drive shaft or the drive element 12 is with a second planet carrier 16A of the second planetary gear set 16 connected. The second planet carrier 16A includes a plurality of planet gears rotatably mounted thereon 16D , The planet wheels 16D are each configured to work with both the sun gear 16B as well as the ring gear 16C to comb. The output shaft or the output element 22 is with a fourth planet carrier 20C of the fourth planetary gear set 20 coupled and is driven directly by this. The fourth planet carrier 20C includes a plurality of planet gears rotatably mounted thereon 20D , The planet wheels 20D are each configured to work with both the sun gear 20A as well as the ring gear 20B to comb.

A first clutch 26 connects a first planetary carrier 14B of the first planetary gear set 14 selectively with a second sun gear 16B of the second planetary gear set 16 and a third sun gear 18B of the third planetary gear set 18 , The first planet carrier 14B includes a plurality of rotatably arranged thereon pairs planetary gears 14D . 14E , The planet wheels 14E are configured to each with both the sun gear 14A as well as the planet wheels 14D to comb. The planet wheels 14D are each configured to work with both the planetary gears 14E as well as the ring gear 14C to comb. A second clutch 28 connects a second ring gear 16C of the second planetary gear set 16 selectively with the fourth planetary carrier 20C of the fourth planetary gear set 20 and the output shaft or the output member 22 , A third clutch 32 connects the second sun wheel 16B of the second planetary gear set 16 and the third sun wheel 18B of the third planetary gear set 18 selectively with a third ring gear 18A of the third planetary gear set 18 and a fourth sun gear 20A of the fourth planetary gear set 20 , A first brake 36 connects the first planet carrier 14B of the first planetary gear set 14 with mass, the fixed element, or the gearbox 40 , A second brake 38 connects a fourth ring gear 20B of the fourth planetary gear set 20 selectively with ground, the fixed element, or the transmission housing 40 ,

A first shaft, sleeve or connecting element 42 couples a first ring gear 14C of the first planetary gear set 14 with a third planet carrier 18C of the third planetary gear set 18 , The third planet carrier 18C includes a plurality of planet gears rotatably mounted thereon 18D , The planet wheels 18D are each configured to rad with both the sun 18B as well as the ring gear 18A to comb. A second shaft, sleeve or connecting element 44 couples the first planetary carrier 14B of the first planetary gear set 14 with the first clutch 26 , A third shaft, sleeve or connecting element 46 couples the first clutch 26 with the second sun gear 16B of the second planetary gear set 16 , the third sun wheel 18B of the third planetary gear set 18 and the third clutch 32 , A fourth shaft, sleeve or connecting element 48 couples the second ring gear 16C of the second planetary gear set 16 with the second clutch 28 , A fifth shaft, sleeve or connecting element 56 couples the third ring gear 18A of the third planetary gear set 18 , the third clutch 32 and the fourth sun gear 20A of the fourth planetary gear set 20 ,

Now, referring to the 2 and 3 the operation of the first embodiment of the eight-speed automatic transmission 10 described. It should be noted that the automatic transmission 10 is capable of torque from the drive shaft or the drive element 12 on the output shaft or the output element 22 in eight forward speed or torque ratios and a reverse speed or torque ratio. Each forward and reverse speed or torque ratio is achieved by engagement of a combination of three of the clutches and brakes, as discussed below. 3 is a truth table illustrating the various combinations of clutches and brakes that are activated or engaged to achieve the various gear states. Actual numerical ratios of the various gear states are also shown, although it will be appreciated that these numerical values are exemplary only, and that they can be set over significant ranges to suit various applications and operating criteria of the automatic transmission 10 adapt.

To establish forward and reverse speed ratios, three torque transmitting devices are engaged for each gear state. The engaged clutches and brakes are indicated in each line by an "X". For example, to make the reverse, the first brake 36 , the second brake 38 and the second clutch 28 indented or activated. The first brake 36 puts the first planet carrier 14B of the first planetary gear set 14 stuck on earth. The second brake 38 sets the fourth ring gear 20B of the fourth planetary gear set 20 stuck on earth. The second clutch 28 connects the second ring gear 16C of the second planetary gear set 16 through the fourth shaft, sleeve or connecting element 48 with the fourth planet carrier 20C of the fourth planetary gear set 20 and the output shaft or the output member 22 ,

Likewise, the eight forward gears are achieved by different combinations of clutch and brake engagement as shown in FIG 3 is shown.

It should be noted that the operation and the gear states of the first embodiment of the eight-speed automatic transmission 10 First, assuming that all clutches and brakes not specifically mentioned in a given gear condition are inactive or disengaged, and secondly, during gear member shifts, ie, changing gear condition, between at least adjacent gear conditions, engaged or activated clutch or brake, in either gear condition will remain activated.

Now 4 is a lever diagram for a second embodiment of an eight-speed automatic transmission 100 illustrated. The automatic transmission 100 includes a drive shaft or a drive element 112 , a first planetary gear set 114 with three nodes: a first node 114A , a second node 114B and a third node 114C , a second planetary gear set 116 with three nodes: a first node 116A , a second node 116B and a third node 116C , a third planetary gear set 118 with three nodes: a first node 118A , a second node 118B and a third node 118C , a fourth planetary gear set 120 with three nodes: a first node 120A , a second node 120B and a third node 120C , and an output shaft or an output member 122 , The first node 114A of the first planetary gear set 114 is with the first node 116A of the second planetary gear set 116 coupled. The third node 114C of the first planetary gear set 114 is with the third node 118C of the third planetary gear set 118 coupled. The second node 116B of the second planetary gear set 116 is with the second node 118B of the third planetary gear set 118 coupled. The first node 118A of the third planetary gear set 118 is with the first node 120A of the fourth planetary gear set 120 coupled.

The drive shaft or the drive element 112 is with the first node 114A of the first planetary gear set 114 coupled. The output shaft or the output element 122 is with the third node 120C of the fourth planetary gear set 120 coupled. A first clutch 126 connects the second node 114B of the first planetary gear set 114 selectively with the third node 116C of the second planetary gear set 116 , A second clutch 128 connects the second node 114B of the first planetary gear set 114 selectively with the second node 116B of the second planetary gear set 116 , A third clutch 132 connects the third node 116C of the second planetary gear set 116 selectively with the third node 120C of the fourth planetary gear set 120 , A first brake 136 connects the third node 114C of the first planetary gear set 114 selectively with ground, the fixed element, or the transmission housing 140 , A second brake 138 connects the second node 120B of the fourth planetary gear set 120 selectively with ground, the fixed element, or the transmission housing 140 ,

Now referring to 5 1 is a schematic diagram of a schematic layout of the second embodiment of the eight-speed transmission 100 in accordance with the present invention 5 the numbering is taken from the lever diagram of 4 accepted. The clutches, brakes and couplings are shown accordingly, whereas the nodes of the planetary gear sets 114 . 116 . 118 and 120 now appear as components of planetary gear sets, such as sun gears, ring gears and planet carrier with planetary gears.

The gear 100 includes the drive shaft or the drive element 112 that with a first planet carrier 114A of the first planetary gear set 114 and a second ring gear 116A of the second planetary gear set 116 is coupled and this drives directly. The first planet carrier 114A includes a plurality of planet gears rotatably mounted thereon 114D , The planet wheels 114D are each configured to work with both the sun gear 114C as well as the ring gear 114B to comb. The first clutch 126 connects a first ring gear 114B of the first planetary gear set 114 selectively with a second planetary carrier 116C of the second planetary gear set 116 , The second planet carrier 116C includes a plurality of planet gears rotatably mounted thereon 116D , The planet wheels 116D are each configured to work with both the sun gear 116B as well as the ring gear 116A to comb. The second clutch 128 connects the first ring gear 114B of the first planet gearset 114 selectively with a second sun gear 116B of the second planetary gear set 116 and a third sun gear 118B of the third planetary gear set 118 , The third clutch 132 connects the second planetary carrier 116C of the second planetary gear set 116 selectively with a fourth planetary carrier 120C of the fourth planetary gear set 120 and the output shaft or the output member 122 , The fourth planet carrier 120C includes a plurality of planet gears rotatably mounted thereon 120D , The planet wheels 120D are each configured to work with both the sun gear 120A as well as the ring gear 120B to comb. A first brake 136 connects a first sun gear 114C of the first planetary gear set 114 and a third planet carrier 118C of the third planetary gear set 118 selectively with ground, the fixed element, or the transmission housing 140 , The third planet carrier 118C includes a plurality of rotatably arranged thereon pairs planetary gears 118D . 118E , The planet wheels 118D are each configured to work with both the planetary gears 118E as well as the ring gear 118A to comb. The planet wheels 118E are each configured to work with both the planetary gears 118D as well as the sun wheel 118B to comb. A second brake 138 connects a fourth ring gear 120B of the fourth planetary gear set 120 selectively with ground, the fixed element, or the transmission housing 140 ,

A first shaft, sleeve or connecting element 142 couples the first sun gear 114C of the first planetary gear set 114 and the first brake 136 with the third planet carrier 118C of the third planetary gear set 118 , A second shaft, sleeve or connecting element 144 couples the first ring gear 114B of the first planetary gear set 114 with the first clutch 126 and the second clutch 128 , A third shaft, sleeve or connecting element 146 couples the first clutch 126 with the second planet carrier 116C of the second planetary gear set 116 , A fourth shaft, sleeve or connecting element 148 couples the second sun gear 116B of the second planetary gear set 116 and the third sun gear 118B of the third planetary gear set 118 with the second clutch 128 , A fifth shaft, sleeve or connecting element 152 couples a third ring gear 118A of the third planetary gear set 118 with a fourth sun gear 120A of the fourth planetary gear set 120 ,

Now, referring to the 5 and 6 the operation of the second embodiment of the eight-speed automatic transmission 100 described. It should be noted that the automatic transmission 100 is capable of torque from the drive shaft or the drive element 112 on the output shaft or the output element 122 in eight forward speed or torque ratios and a reverse speed or torque ratio. Each forward and reverse speed or torque ratio is achieved by engagement of a combination of three of the clutches and brakes, as discussed below. 6 is a truth table illustrating the various combinations of clutches and brakes that are activated or engaged to achieve the various gear states. Actual numerical ratios of the various gear states are also shown, although it will be appreciated that these numerical values are exemplary only, and that they can be set over significant ranges to suit various applications and operating criteria of the automatic transmission 100 adapt.

To establish forward and reverse speed ratios, three torque transmitting devices are engaged for each gear state. The engaged clutches and brakes are indicated in each line by an "X". For example, to make the reverse, the first brake 136 , the second brake 138 and the third clutch 132 activated or indented. The first brake 136 puts the first sun wheel 114C of the first planetary gear set 114 and the third planet carrier 118C of the third planetary gear set 118 stuck on earth. The second brake 138 sets the fourth ring gear 120B of the fourth planetary gear set 120 stuck on earth. The third clutch 132 connects the second planetary carrier 116C of the second planetary gear set 116 selectively with the fourth planetary carrier 120C of the fourth planetary gear set 120 and the output shaft or the output member 122 , Similarly, the eight forward gears are achieved by different combinations of clutch and brake engagement as shown in FIGS 6 is shown.

It should be noted that the operation and the gear states of the eight-speed automatic transmission 100 First, assuming that all clutches and brakes not specifically mentioned in a given gear condition are inactive or disengaged, and secondly, during gear member shifts, ie, changing gear condition, between at least adjacent gear conditions, engaged or activated clutch or brake, in either gear condition will remain activated.

Now 7 is a lever diagram for a third embodiment of an eight-speed automatic transmission 200 illustrated. The automatic transmission 200 includes a drive shaft or a drive element 212 , a first planetary gear set 214 with three nodes: a first node 214A , a second node 214B and a third node 214C , a second planetary gear set 216 with three nodes: a first node 216A one two th node 216B and a third node 216C , a third planetary gear set 218 with three nodes: a first node 218A , a second node 218B and a third node 218C , a fourth planetary gear set 220 with three nodes: a first node 220A , a second node 220B and a third node 220C , and an output shaft or an output member 222 , The first node 214A of the first planetary gear set 214 is with the first node 216A of the second planetary gear set 216 coupled. The third node 214C of the first planetary gear set 214 is with the third node 218C of the third planetary gear set 218 coupled. The second node 216B of the second planetary gear set 216 is with the second node 218B of the third planetary gear set 218 coupled. The first node 218A of the third planetary gear set 218 is with the first node 220A of the fourth planetary gear set 220 coupled.

The drive shaft or the drive element 212 is with the first node 216A of the second planetary gear set 216 and the first node 214A of the first planetary gear set 214 coupled. The output shaft or the output element 222 is with the second node 220B of the fourth planetary gear set 220 coupled. A first clutch 226 connects the third node 214C of the first planetary gear set 214 selectively with the third node 216C of the second planetary gear set 216 , A second clutch 228 connects the second node 214B of the first planetary gear set 214 selectively with the third node 216C of the second planetary gear set 216 , A third clutch 232 connects the second node 214B of the first planetary gear set 214 selectively with the second node 220B of the fourth planetary gear set 220 and the output shaft or the output member 222 , A first brake 236 connects the second node 216B of the second planetary gear set 216 selectively with ground, the fixed element, or the transmission housing 240 , A second brake 238 connects the third node 220C of the fourth planetary gear set 220 selectively with ground, the fixed element, or the transmission housing 240 ,

Now referring to 8th 1 is a schematic diagram of a schematic layout of the third embodiment of the eight-speed transmission 200 in accordance with the present invention 8th the numbering is taken from the lever diagram of 7 accepted. The clutches, brakes and couplings are illustrated accordingly, whereas the nodes of the planetary gear sets now appear as components of planetary gear sets, such as sun gears, ring gears and planet carriers with planetary gears.

The gear 200 includes the drive shaft or the drive element 212 that with a second planetary carrier 216A of the second planetary gear set 216 and a first ring gear 214A of the first planetary gear set 214 is coupled and this drives directly. The second planet carrier 216A includes a plurality of planet gears rotatably mounted thereon 216D , The planet wheels 216D are each configured to work with both the sun gear 216B as well as the ring gear 216C to comb. The output shaft or the output element 222 is with a fourth ring gear 220B of the fourth planetary gear set 220 coupled and is driven directly by this. The first clutch 226 connects a second ring gear 216C of the second planetary gear set 216 selectively with a first sun gear 214C of the first planetary gear set 214 and a third sun gear 218C of the third planetary gear set 218 , The second clutch 228 connects the second ring gear 216C of the second planetary gear set 216 selectively with a first planet carrier 214B of the first planetary gear set 214 , The first planet carrier 214B includes a plurality of planet gears rotatably mounted thereon 214D , The planet wheels 214D are each configured to work with both the sun gear 214C as well as the ring gear 214A to comb. The third clutch 232 connects the first planet carrier 214B of the first planetary gear set 214 selectively with the fourth ring gear 220B of the fourth planetary gear set 220 and the drive shaft or the output member 222 , The first brake 236 connects a second sun gear 216B of the second planetary gear set 216 and a third ring gear 218B of the third planetary gear set 218 with mass, the fixed element, or the gearbox 240 , The second brake 238 connects a fourth sun gear 220C of the fourth planetary gear set 220 with mass, the fixed element, or the gearbox 240 ,

A first shaft, sleeve or connecting element 242 couples the second sun gear 216B of the second planetary gear set 216 and the third ring gear 218B of the third planetary gear set 218 with the first brake 236 , A second shaft, sleeve or connecting element 244 couples the second ring gear 216C of the second planetary gear set 216 with the second clutch 228 and the first clutch 226 , A third shaft, sleeve or connecting element 246 couples the first sun gear 214C of the first planetary gear set 214 and the third sun wheel 218C of the third planetary gear set 218 with the first clutch 226 , A fourth shaft, sleeve or connecting element 248 couples the first planetary carrier 214B of the first planetary gear set 214 with the second clutch 228 , A fifth shaft, sleeve or connecting element 252 couples a third planet carrier 218A of the third planetary gear set 218 with a fourth planet carrier 220A of the fourth planetary gear set 220 , The third planet carrier 218A includes a plurality of planet gears rotatably mounted thereon 218D , The planet wheels 218D are each configured to work with both the sun gear 218C as well as the ring gear 218B to comb. The fourth planet carrier 220A includes a plurality of rotatably arranged thereon pairs planetary gears 220D . 220E , The planet wheels 220D are each configured to work with both the planetary gears 220E as well as the ring gear 220B to comb. The planet wheels 220E are each configured to work with both the planetary gears 220D as well as the sun wheel 220C to comb. A sixth shaft, sleeve or connecting element 254 couples the fourth sun gear 220C of the fourth planetary gear set 220 with the second brake 238 ,

Now, referring to the 8th and 9 the operation of the third embodiment of the eight-speed automatic transmission 200 described. It should be noted that the automatic transmission 200 is capable of torque from the drive shaft or the drive element 212 on the output shaft or the output element 222 in eight forward speed or torque ratios and a reverse speed or torque ratio. Each forward and reverse speed or torque ratio is achieved by engagement of a combination of three of the clutches and brakes, as discussed below. 9 is a truth table illustrating the various combinations of clutches and brakes that are activated or engaged to achieve the various gear states. Actual numerical ratios of the various gear states are also shown, although it will be appreciated that these numerical values are exemplary only, and that they can be set over significant ranges to suit various applications and operating criteria of the automatic transmission 200 adapt.

To establish forward and reverse speed ratios, three torque transmitting devices are engaged for each gear state. The engaged clutches and brakes are indicated in each line by an "X". For example, to make the reverse, the first brake 236 , the second brake 238 and the third clutch 232 indented or activated. The first brake 236 connects the second sun wheel 216B of the second planetary gear set 216 and the third ring gear 218B of the third planetary gear set 218 with mass, the fixed element, or the gearbox 240 through the first shaft, sleeve or connecting element 242 , The second brake 238 connects the fourth sun gear 220C of the fourth planetary gear set 220 with mass, the fixed element, or the gearbox 240 , The third clutch 232 connects the first planet carrier 214B of the first planetary gear set 214 with the output shaft or the output element 222 and the fourth ring gear 220B of the fourth planetary gear set 220 , Similarly, the eight forward gears are achieved by different combinations of clutch and brake engagement as shown in FIGS 9 is shown.

It should be noted that the operation and the gear states of the third embodiment of the eight-speed automatic transmission 200 First, assuming that all clutches and brakes not specifically mentioned in a given gear condition are inactive or disengaged, and secondly, during gear member shifts, ie, changing gear condition, between at least adjacent gear conditions, engaged or activated clutch or brake, in either gear condition will remain activated.

The Description of the invention is merely exemplary in nature, and Modifications that do not deviate from the idea of the invention should within the scope of the invention. Such modifications are not to be regarded as a departure from the spirit and scope of the invention.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited non-patent literature

• SAE Paper 810102, "The Lever Analogy: A New Tool in Transmission Analysis" [0024]

Claims (30)

Transmission comprising: a drive element; one Output element; a first, second, third and fourth Planetary gear set, each having a first, second and third element exhibit; a first connecting element, which is the third element of the first planetary gear set constantly with the second element connects the third planetary gear set; a second connecting element, that the first element of the second planetary gear set constantly connects to the first element of the third planetary gear set; one third connecting element, which is the third element of the third planetary gear set constantly with the first element of the fourth planetary gear set links; and five torque transmission devices, which are selectively engageable to one of the first elements, the second elements and the third elements with at least one other the first elements, the second elements, the third elements and to connect a fixed element, and the Torque transmission devices selectively in combinations of at least three are engageable by at least eight Forward gears and at least one reverse gear make between the drive element and the output element. Transmission according to claim 1, wherein a first of the five Torque transmission devices selectively engageable is to the first element of the second planetary gear set and / or the first element of the third planetary gear set with the second Connect element of the first planetary gear set. Transmission according to claim 2, wherein a second of the five Torque transmission devices selectively engageable is to the third element of the second planetary gear set with the second element of the fourth planetary gear set and / or the output element connect to. Transmission according to claim 3, wherein a third of the five Torque transmission devices selectively engageable is to the first element of the third planetary gear set and / or the first element of the second planetary gear set with the third Element of the third planetary gear set and / or the first element to connect the fourth planetary gear set. Transmission according to claim 4, wherein a fourth of the five Torque transmission devices selectively engageable is to the second element of the first planetary gear with the to connect fixed element. Transmission according to claim 5, wherein a fifth of the five torque transmitting devices selectively is engageable to the third element of the fourth planetary gear set to connect with the fixed element. Transmission according to claim 1, wherein the first elements Sun gears are the second elements carrier are and the third elements are ring gears. Transmission according to claim 1, wherein the drive element constantly with the first element of the first planetary gear set and / or the second element of the second planetary gear set is and the output element constantly with the second element the fourth planetary gear set is connected. Transmission according to claim 1, wherein a first of the five Torque transmission devices selectively engageable is to the second element of the first planetary gear with the third element of the second planetary gear set to connect. Transmission according to claim 9, wherein a second of the five torque transmitting devices selectively is engageable to the first element of the second planetary gear set and / or the first element of the third planetary gear set with the connect second element of the first planetary gear set. Transmission according to claim 10, wherein a third of the five torque transmitting devices selectively engageable to the second element of the fourth planetary gear set and / or the output element with the third element of the second To connect planetary gear set. Transmission according to claim 11, wherein a fourth of the five torque transmitting devices selectively engageable to the third element of the first planetary gear set and / or the second element of the third planetary gear set with the to connect fixed element. Transmission according to claim 12, wherein a fifth of the five torque transmitting devices selectively is engageable to the third element of the fourth planetary gear set to connect with the fixed element. The transmission of claim 1, wherein the third element of the first planetary gear set, the first element of the second planetary gear set, the first element of the third planetary gear set and the first element of the fourth planetary gear set are sun gears, the first element of the first planetary gear set, the third element of the second planetary gear set, the second element of the third Planetenradsat Zes and the second element of the fourth planetary gear are carriers, and the second element of the first planetary gear set, the second element of the second planetary gear set, the third element of the third planetary gear set and the third element of the fourth planetary gear set are ring gears. Transmission according to claim 1, wherein a first of the five Torque transmission devices selectively engageable is to the third element of the second planetary gear set with the second element of the third planetary gear and / or the third Connect element of the first planetary gear set. Transmission according to claim 15, wherein a second of the five torque transmitting devices selectively is engageable to the third element of the second planetary gear set to connect with the second element of the first planetary gear set. Transmission according to claim 16, wherein a third of the five torque transmitting devices selectively engageable to the second element of the fourth planetary gear set and / or the output element with the second element of the first To connect planetary gear set. Transmission according to claim 17, wherein a fourth of the five torque transmitting devices selectively is engageable to the first element of the second planetary gear set and / or the first element of the third planetary gear set with the to connect fixed element. Transmission according to claim 20, wherein a fifth of the five torque transmitting devices selectively is engageable to the third element of the fourth planetary gear set to connect with the fixed element. Transmission according to claim 1, wherein the third element of the first planetary gear set, the first element of the second planetary gear set, the second element of the third planetary gear set and the third element the fourth planetary gear sun gears are, the second Element of the first planetary gear set, the second element of the second Planetenradsatzes, the third element of the third planetary gear set and the first element of the fourth planetary gear carrier are, and the first element of the first planetary gear, the third Element of the second planetary gear set, the first element of the third Planetary gear set and the second element of the fourth planetary gear set Ring gears are. Transmission according to claim 1, wherein the fixed Element is a transmission housing. Transmission comprising: a drive element; one Output element; a first, second, third and fourth Planetary gear set, each having a first, second and third element have, wherein the drive element constantly with the first Element of the first planetary gear set and the second element of the second planetary gear set is connected and the output element constantly connected to the second element of the fourth planetary gear set is; a first connecting element, which is the third element of the first planetary gear set constantly with the second element connects the third planetary gear set; a second connecting element, that the first element of the second planetary gear set constantly connects to the first element of the third planetary gear set; one third connecting element, which is the third element of the third planetary gear set constantly with the first element of the fourth planetary gear set links; a first torque transmitting device, which is selectively engageable to the first element of the second Planetary gear and / or the first element of the third planetary gear set to connect with the second element of the first planetary gear set; a second torque transmitting device, which selectively is engageable to the third element of the second planetary gear set with the second element of the fourth planetary gear set and / or the Connecting output element; a third torque transmitting device, which is selectively engageable to the first element of the third Planetary gear and / or the first element of the second planetary gear set with the third element of the third planetary gear set and / or the first Connect element of the fourth planetary gear set; a fourth Torque transfer device selectively engageable is to the second element of the first planetary gear with a to connect the fixed element; and a fifth Torque transfer device selectively engageable is to the third element of the fourth planetary gear with the to connect fixed element, and wherein the torque transmitting devices selectively in combinations of at least three are engageable, by at least eight forward gears and at least a reverse gear between the drive element and produce the output element. Transmission according to claim 22, wherein the first elements Sun gears are the second elements carrier are and the third elements are ring gears. A transmission comprising: a drive member; an output element; a first, second, third and fourth planetary gear set each having first, second and third members, the drive member being continuously connected to the first member of the first planetary gear set and the second member of the second planetary gear set and the output member continuously connected to the second member of the first planetary gear set fourth planetary gear set is connected; a first connecting member continuously connecting the third member of the first planetary gear set to the second member of the third planetary gear set; a second link continuously connecting the first member of the second planetary gear set to the first member of the third planetary gear set; a third link continuously connecting the third member of the third planetary gear set with the first member of the fourth planetary gear set; a first torque transmitting device selectively engageable to interconnect the second member of the first planetary gear set with the third member of the second planetary gear set; a second torque transmitting device selectively engageable to connect the first member of the second planetary gear set and / or the first member of the third planetary gear set to the second member of the first planetary gear set; third torque transmitting means selectively engageable to connect the second member of the fourth planetary gear set and / or the output member to the third member of the second planetary gear set; fourth torque transmitting means selectively engageable to connect the third member of the first planetary gear set and / or the second member of the third planetary gear set to a stationary member; and a fifth torque transmitting device selectively engageable to interconnect the third element of the fourth planetary gear set with the stationary element, and wherein the torque transmitting devices are selectively engageable in combinations of at least three to provide at least eight forward speeds and at least one reverse speed between the drive element and the at least one reverse gear Produce output element. Transmission according to claim 24, wherein the third element of the first planetary gear set, the first element of the second planetary gear set, the first element of the third planetary gear set and the first element the fourth planetary gear sun gears are, the first Element of the first planetary gear, the third element of the second Planetenradsatzes, the second element of the third planetary gear set and the second member of the fourth planetary gear carrier are, and the second element of the first planetary gear set, the second Element of the second planetary gear set, the third element of the third Planetary gear set and the third element of the fourth planetary gear set Ring gears are. Transmission comprising: a drive element; one Output element; a first, second, third and fourth Planetary gear set, each having a first, second and third element have, wherein the drive element constantly with the first Element of the first planetary gear set and the second element of the second Planetenradsat ZES is connected and the output element constantly connected to the second element of the fourth planetary gear set is; a first connecting element, which is the third element of the first planetary gear set constantly with the second element connects the third planetary gear set; a second connecting element, that the first element of the second planetary gear set constantly connects to the first element of the third planetary gear set; one third connecting element, which is the third element of the third planetary gear set constantly with the first element of the fourth planetary gear set links; a first torque transmitting device, which is selectively engageable to the third element of the second Planetary gear set with the second element of the third planetary gear set and / or to connect the third element of the first planetary gear set; a second torque transmitting device, which selectively is engageable to the third element of the second planetary gear set to connect with the second element of the first planetary gear set; a third torque transmitting device, which selectively engageable to the second element of the fourth planetary gear set and / or the output element with the second element of the first Connect planetary gear set; a fourth torque transmitting device, which is selectively engageable to the first element of the second Planetary gear and / or the first element of the third planetary gear set to connect with a fixed element; and a fifth Torque transfer device selectively engageable is to the third element of the fourth planetary gear with the to connect fixed element, and wherein the torque transmitting devices selectively in combinations of at least three are engageable, by at least eight forward gears and at least a reverse gear between the drive element and produce the output element. Transmission according to claim 26, wherein the third element of the first planetary gear, the first Element of the second planetary gear set, the second element of the third planetary gear set and the third element of the fourth planetary gear sun gears, the second element of the first planetary gear, the second element of the second planetary, the third element of the third planetary gear and the first element of the fourth planetary gear carrier and the first member of the first planetary gear set, the third element of the second planetary gear set, the first element of the third planetary gear set and the second element of the fourth planetary gear set are ring gears. Transmission comprising: a drive element; one Output element; a first, second, third and fourth Planetary gear, each with a sun gear, a carrier and a ring gear, wherein the drive element constantly with the sun gear of the first planetary gear set and the carrier the second planetary gear set is connected and the output element constantly with the carrier of the fourth planetary gear set connected is; a first connecting element that the ring gear of the first planetary gear set constantly with the carrier of third planetary gear connects; a second connecting element, the sun gear of the second planetary gear set constantly connects to the sun gear of the third planetary gear set; one third connecting element, which is the ring gear of the third planetary gear set constantly with the sun gear of the fourth planetary gear set links; a first torque transmitting device, which is selectively engageable to the sun gear of the second Planetary gear set and / or the sun gear of the third planetary gear set to connect with the carrier of the first planetary gear set; a second torque transmitting device, which selectively is engageable to the ring gear of the second planetary gear set with the carrier of the fourth planetary gear set and / or the Connecting output element; a third torque transmitting device, which is selectively engageable with the sun gear of the third planetary gear set and / or the sun gear of the second planetary gear set with the ring gear of the third planetary gear set and / or the sun gear of the fourth Connect planetary gear set; a fourth torque transmitting device, which is selectively engageable to the wearer of the first planetary gear set to connect with a fixed element; and a fifth torque transmitting device, which is selectively engageable to the ring gear of the fourth planetary gear set to connect with the fixed element, and wherein the torque transmitting devices selectively in combinations of at least three are engageable, by at least eight forward gears and at least a reverse gear between the drive element and produce the output element. Transmission comprising: a drive element; one Output element; a first, second, third and fourth Planetary gear, each with a sun gear, a carrier and a ring gear, wherein the drive element constantly with the carrier of the first planetary gear set and the ring gear the second planetary gear set is connected and the output element constantly with the carrier of the fourth planetary gear set connected is; a first connecting element, which is the sun gear of first planetary gear set constantly with the carrier connects the third planetary gear set; a second connecting element, the sun gear of the second planetary gear set constantly connects to the sun gear of the third planetary gear set; one third connecting element, which is the ring gear of the third planetary gear set constantly with the sun gear of the fourth planetary gear set links; a first torque transmitting device, which is selectively engageable to the ring gear of the first planetary gear set to connect with the carrier of the second planetary gear set; a second torque transmitting device, which selectively engageable to the sun gear of the second planetary gear set and / or the sun gear of the third planetary gear set with the ring gear to connect the first planetary gear set; a third torque transmitting device, which is selectively engageable to the wearer of the fourth planetary gear set and / or the output element with the carrier to connect the second planetary gear set; a fourth torque transmitting device, which is selectively engageable to the sun gear of the first planetary gear set and / or the carrier of the third planetary gear set with a to connect the fixed element; and a fifth Torque transfer device selectively engageable is to the ring gear of the fourth planetary gear set with the fixed Element to connect, and wherein the torque transmitting devices selectively in combinations of at least three are engageable, by at least eight forward gears and at least a reverse gear between the drive element and produce the output element. A transmission comprising: a drive member; an output element; a first, second, third and fourth planetary gear set, each having a sun gear, a carrier and a ring gear, wherein the drive element constantly connected to the ring gear of the first planetary gear set and the carrier of the second planetary gear set and the output member is continuously connected to the ring gear of the fourth planetary gear set; a first connecting member which continuously connects the sun gear of the first planetary gear set to the sun gear of the third planetary gear set; a second connecting member which continuously connects the sun gear of the second planetary gear set to the ring gear of the third planetary gear set; a third connecting element which connects the carrier of the third planetary gear set constantly with the carrier of the fourth planetary gear set; a first torque transmitting device selectively engageable to interconnect the ring gear of the second planetary gear set with the sun gear of the third planetary gear set and / or the sun gear of the first planetary gear set; a second torque transmitting device selectively engageable to interconnect the ring gear of the second planetary gear set with the carrier of the first planetary gear set; a third torque transmitting device selectively engageable to interconnect the ring gear of the fourth planetary gear set and / or the output member with the carrier of the first planetary gear set; a fourth torque transmitting device selectively engageable to connect the sun gear of the second planetary gear set and / or the ring gear of the third planetary gear set to a stationary member; and fifth torque transmitting means selectively engageable to connect the sun gear of the fourth planetary gear set to the stationary member, and wherein the torque transmitting devices are selectively engageable in combinations of at least three by at least eight forward gears and at least one reverse gear between the input member and the output member manufacture.