Abstract: The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least seven forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets having six torque-transmitting mechanisms. A fixed interconnection continuously connects members of the first and second planetary gear sets with the transmission housing. The powertrain includes an engine and torque converter that is continuously connected to one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting mechanisms provide interconnections between various gear members, the input shaft, the output shaft, and with the transmission housing, and are operated in combinations of three to establish at least seven forward speed ratios and one reverse speed ratio.

Abstract: A family of transmissions has a plurality of members that can be utilized in powertrains to provide at least seven forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets having six torque-transmitting mechanisms and two fixed interconnections. Also, one planetary gear member is continuously connected with the transmission housing. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with another of the planetary gear members. The six torque-transmitting mechanisms provide interconnections between various gear members, the fixed interconnections, the input shaft, the output shaft, and the transmission housing, and are operated in combinations of two to establish at least seven forward speed ratios and at least one reverse speed ratio.

Abstract: The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least seven forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets having six torque-transmitting mechanisms and a fixed interconnection. Also, one planetary gear member is continuously connected with the transmission housing. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with at least one of the planetary gear members. The six torque-transmitting mechanisms provide interconnections between various gear members, the fixed interconnection, the input shaft, the output shaft, and the transmission housing, and are operated in combinations of two to establish at least seven forward speed ratios and at least one reverse speed ratio.

Abstract: The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least seven forward speed ratios and at least one reverse speed ratio. The transmission family members include three planetary gear sets having six torque-transmitting mechanisms and two fixed interconnections. Also, one planetary gear member is continuously connected with the transmission housing. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with at least one of the planetary gear members. The six torque-transmitting mechanisms provide interconnections between various gear members, the fixed interconnections, the input shaft, the output shaft, and the transmission housing, and are operated in combinations of two to establish at least seven forward speed ratios and at least one reverse speed ratio.

Abstract: The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least seven forward speed ratios and at least one reverse speed ratio. The transmission family members include three planetary gear sets having six torque-transmitting mechanisms and two fixed interconnections. Also, one planetary gear member is continuously connected with the transmission housing. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with at least one of the planetary gear members. The six torque-transmitting mechanisms provide interconnections between various gear members, the fixed interconnections, the input shaft, the output shaft, and the transmission housing, and are operated in combinations of two to establish at least seven forward speed ratios and one reverse speed ratio.

Abstract: The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least five forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets and four clutches. The powertrain includes an engine and torque converter that is continuously connected to at least one member of the planetary gear arrangement and an output member that is continuously connected with another of the planetary gear members. At least one other planetary gear member is continuously connected with the transmission housing. The four clutches provide interconnections between various gear members and with the input and the output shaft, and are operated in combinations of two to establish at least five forward speed ratios.

Abstract: The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least seven forward speed ratios and at least one reverse speed ratio. The transmission family members include three planetary gear sets having six torque-transmitting mechanisms and two fixed interconnections. Also, one planetary gear member is continuously connected with the transmission housing. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with at least one of the planetary gear members. The six torque-transmitting mechanisms provide interconnections between various gear members, the fixed interconnections, the input shaft, the output shaft, and the transmission housing, and are operated in combinations of two to establish at least seven forward speed ratios and one reverse speed ratio.

Abstract: The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least seven forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets having six torque-transmitting mechanisms and a fixed interconnection. Also, one planetary gear member is continuously connected with the transmission housing. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with at least one of the planetary gear members. The six torque-transmitting mechanisms provide interconnections between various gear members, the fixed interconnection, the input shaft, the output shaft, and the transmission housing, and are operated in combinations of two to establish at least seven forward speed ratios and at least one reverse speed ratio.

Abstract: A family of transmissions incorporating three planetary gearsets and five torque-transmitting mechanisms is effective in a powertrain to produce at least six forward speed ratios and one reverse speed ratio between a transmission input shaft and a transmission output shaft. The planetary gearsets each have three planetary gear members in which two of the planetary gearsets have two members continuously interconnected and one of those planetary gearsets and the remaining planetary gearset have two members continuously interconnected. The remaining planetary gearset has one member continuously connected with the transmission housing and the transmission output shaft is continuously connected with at least one member of the planetary gearsets. The planetary gearsets have members that are selectively interconnected with the transmission input shaft through three selectively engageable torque-transmitting mechanisms.

Abstract: A family of power transmissions which are utilized in a powertrain include three planetary gearsets and five torque-transmitting mechanisms. The torque-transmitting mechanisms are engaged in combinations of three to provide a reverse drive ratio and six forward speed ratios. The torque-transmitting mechanisms will include at least four rotating type torque-transmitting mechanisms and, in some instances, one stationary type torque-transmitting mechanism. The planetary gearsets are of either the single pinion type or of the double pinion type of planetary gearsets.

Abstract: A family of multi-speed planetary transmissions has three planetary gearsets each with three planetary members and five torque-transmitting mechanisms. The transmission also has two interconnecting members, one of which interconnects a member of each of the planetary gearsets, and the other of which interconnects two members of the planetary gearsets. All of the transmission family members include one member continuously connected with a stationary member or transmission housing. In each family member, the input shaft of the transmission is selectively connectible with the planetary gearsets through three of the torque-transmitting mechanisms. The output shaft of the transmission is continuously connected with at least one member of the planetary gearset. The torque-transmitting mechanisms are selectively engaged in combinations of two to establish at least six forward speed ratios and one reverse speed ratio.

Abstract: A family of multi-speed planetary transmissions has three planetary gearsets each with three planetary members and five torque-transmitting mechanisms. The transmission also has two interconnecting members, one of which interconnects a member of each of the planetary gearsets, and the other of which interconnects two members of the planetary gearsets. All of the transmission family members include one member continuously connected with a stationary member or transmission housing. In each family member, the input shaft of the transmission is selectively connectible with the planetary gearsets through three of the torque-transmitting mechanisms. The output shaft of the transmission is continuously connected with at least one member of the planetary gearset. The torque-transmitting mechanisms are selectively engaged in combinations of two to establish at least six forward speed ratios and one reverse speed ratio.

Abstract: A family of power transmissions includes three planetary gearsets and five torque-transmitting mechanisms that are selectively engaged to produce at least six forward speed ratios and one reverse speed ratio between an input shaft and an output shaft. The planetary gearsets are arranged such that a member of the first of the planetary gearsets is continuosly interconnected with a member of the second planetary gearset, and a member of the second planetary gearset is continuously interconnected with a member of the third planetary gearset. At least one member of either the first or second planetary gearset is continuously connected with a transmission housing and at least one member of one of the planetary gearsets is connected with the transmission output shaft. The transmission input shaft is selectively connectible with the planetary gearsets only through at least two rotating type torque-transmitting mechanisms.

Abstract: A family of transmissions wherein each family member has an input shaft, an output shaft, three planetary gear sets, and five rotating torque transmitting mechanisms (clutches). A first and second of the planetary gear sets have continuously interconnected first and second members through a interconnecting member, and the second members are continuously connected with a stationary housing. The third planetary gear set has a first member connected with the input shaft and a second member is connected with the output shaft. Five selectively engageable clutch mechanisms are interconnectable between members of the planetary gearsets, the input shaft, and the output shaft. The clutches are engaged in combinations of two to establish six forward speed ratios and one reverse ratio.

Abstract: The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least seven forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets with two brakes, four clutches and three fixed interconnections. The powertrain includes an engine and torque converter that is continuously connected to at least one member of the planetary gear arrangement and an output member that is continuously connected with another of the planetary gear members. The two brakes and four clutches provide interconnections between various gear members and with the transmission housing, the input or output shaft, and the three fixed interconnections, and are operated in combinations of two to establish at least seven forward speed ratios and one reverse speed ratio.

Abstract: A powertrain includes an engine and torque converter, a planetary transmission, and a final drive mechanism. The planetary transmission is selected from a family of transmissions wherein each family member has a first, a second, and a third planetary gear set; and each planetary gear set has a first, a second, and a third member. All of the family members have five torque transmitting mechanisms of the rotating type commonly named clutches. Each of the first members of the first and second planetary gear sets is continuously connected with a stationary portion of the transmission, and each of the first members of the third planetary gear set and the second member of the second planetary gear set are interconnected for common rotation by a connecting member. The input shaft is continuously connected with a member of one of the planetary gear sets, and the output shaft is continuously connected with another member of the planetary gear sets.

Abstract: A method is disclosed for controlling the slip power of a viscous fluid fan drive clutch, especially of a cooling fan drive for an automotive vehicle. Data is prepared correlating slip power generation with clutch input and output speeds for the clutch and fan design. A maximum slip power for the operation of the cooling fan is specified by considering, for one, fan drive durability requirements. During operation of a computer based, fan speed control module, a desired fan drive speed is continually determined for the cooling requirements of the vehicle and the desired fan speed is compared, and adjusted, if appropriate, to avoid excessive slip power.

Abstract: The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least seven forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets and six torque-transmitting mechanisms. A fixed interconnection continuously connects members of the first, second and third planetary gear sets. The powertrain includes an engine and torque converter that is continuously connected to one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting mechanisms provide interconnections between various gear members, the input shaft, the output shaft, and with the transmission housing, and are operated in combinations of three to establish at least seven forward speed ratios and one reverse speed ratio.

Abstract: The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least seven forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets with two brakes, four clutches and three fixed interconnections. The powertrain includes an engine and torque converter that is continuously connected to at least one member of the planetary gear arrangement and an output member that is continuously connected with another of the planetary gear members. The two brakes and four clutches provide interconnections between various gear members and with the transmission housing, the input or output shaft, and the three fixed interconnections, and are operated in combinations of two to establish at least seven forward speed ratios.

Abstract: The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least seven forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets having six torque-transmitting mechanisms and two fixed interconnections. Also, one planetary gear member is continuously connected with the transmission housing. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with at least one of the planetary gear members. The six torque-transmitting mechanisms provide interconnections between various gear members, the fixed interconnections, the input shaft, the output shaft, and the transmission housing, and are operated in combinations of two to establish at least seven forward speed ratios and at least one reverse speed ratio.