JPS6151188B2 - - Google Patents

Description

[Detailed description of the invention]

<Industrial Application Field> The present invention relates to an automatic transmission with an overdrive that is applied to a front engine/front drive (FF) type or a rear engine/rear drive (R-R) type automobile. <Prior Art> Conventionally, in order to reduce fuel consumption, a four-speed automatic transmission has been proposed in which an overdrive device consisting of a set of planetary gear mechanisms and a frictional engagement element is added to a three-speed automatic transmission. When such an overdrive stage is achieved using a planetary gear mechanism, the overdrive ratio is determined by the ratio of the number of teeth between the sun gear and ring gear of the planetary gear mechanism that constitutes the overdrive device. Due to the number of teeth, it is not possible to set the overdrive ratio to around 1.0, which has a large driving force. <Problems to be Solved by the Invention> If such a 4-speed automatic transmission with an overdrive device is installed in a vehicle with high running resistance such as a sports car or a wagon that emphasizes acceleration performance, the overdrive ratio will be low. Because of this small amount, there was a problem that the driving force was insufficient and the accelerating force was insufficient especially when driving at high speeds, making it impossible to run smoothly. Therefore, in order to enable smooth running even when applied to sports cars that place emphasis on acceleration performance or wagon cars with large running resistance, the present invention is designed to have an overdrive ratio of a speed increasing ratio on the side with a large driving force of around 1.0. The object of the present invention is to provide an automatic transmission with an overdrive that can obtain the following. <Means for Solving the Problems> The present invention provides a torque converter connected to an output shaft of an engine, a speed change gear device having first and second planetary gear mechanisms, the torque converter and the speed change gear device. An overdrive device having a third planetary gear mechanism disposed between the overdrive device and an output gear disposed between the overdrive device and the transmission gear device are respectively arranged concentrically, and the output shaft of the torque converter is connected to the carrier of the third planetary gear mechanism and to the sun gears of the first and second planetary gear mechanisms via a first clutch, and the ring gear of the third planetary gear mechanism is connected to the carrier of the third planetary gear mechanism. A clutch is connected to a ring gear of the first planetary gear mechanism, and a carrier of the first planetary gear mechanism and a ring gear of the second planetary gear mechanism are connected to the output gear. The sun gear of the second planetary gear mechanism includes a first brake, and the carrier of the second planetary gear mechanism includes a second brake.
a brake of the third planetary gear mechanism, the carrier of the third planetary gear mechanism being coupled to the sun gear of the third planetary gear mechanism via a third clutch, and the sun gear of the third planetary gear mechanism driving the third brake. comprising: the first, second and third clutches and the first and second clutches;
By selectively operating the third brake, a gear ratio of four forward speeds and one reverse speed, including an overdrive ratio, is obtained. <Example> Next, an example of the present invention will be described with reference to the drawings.
In the figure, the automatic transmission of the present invention includes an output shaft 1 of an engine, a torque converter 20, an output shaft 2 of the torque converter, a speed change gear device 30, an output shaft 4 of the speed change gear device 30, an overdrive device 40, and an output shaft 4. It is composed of an output gear 50 that is coaxially connected, and the overdrive device 40 and the output gear 50 are connected to the torque converter 20 and the speed change gear device 3.
0. The torque converter 20 includes a pump impeller 21,
It is composed of a turbine runner 22 and a stator 23 supported by a one-way clutch 24. The pump impeller 21 is connected to the output shaft 1 of the engine, and the turbine runner 22 is connected to the output shaft 2 of the torque converter. The speed change gear device 30 includes planetary gear mechanisms 60, 70,
It consists of clutches 10, 11, brakes 12, 13, and one-way clutch 14. The output shaft 2 of the torque converter is connected via a clutch 11 to a sun gear shaft 3 with sun gears 61 , 71 of a planetary gear set 60 , 70 , and the ring gear 63 of the planetary gear set 60 is connected via a clutch 10 to a sun gear shaft 3 with sun gears 61 , 71 of a planetary gear set 60 , 70 . It is connected to a shaft 5 which is an output shaft. Further, the sun gear shaft 3 is provided with a brake 12. The carrier 74 of the planetary gear mechanism 70 is equipped with a brake 13 and a one-way clutch 14. A carrier 64 of the planetary gear mechanism 60 and a ring gear 73 of the planetary gear mechanism 70 are connected to the output shaft 4. The overdrive device 40 includes a planetary gear mechanism 80,
Clutch 15, brake 16, one-way clutch 1
Consists of 7. The planetary gear mechanism 80 includes a sun gear 81, a planetary pinion 82, and a ring gear 8.
3. The carrier 84 is connected to the output shaft 2 of the torque converter, and is provided with a clutch 15 and a one-way clutch 17 between it and the sun gear 81. The sun gear 81 is equipped with a brake 16. Further, the ring gear 83 is connected to the shaft 5 which is the output shaft of the overdrive device 40. Clutches 10, 11, 15, brakes 12, 13, 16, and one-way clutches 14, 1 at each gear stage of the automatic transmission of the present invention configured as described above.
The operations of 7 are summarized in Table 1. In Table 1, the mark ◯ indicates that it is operating by a hydraulic oil operating mechanism. The symbol △ indicates that the engine brake is being operated by the pressurized oil operating mechanism when necessary. The * mark indicates that the one-way clutch is locked only when the engine is driving.

[Table] Next, the operation of each gear stage will be explained. First forward speed...clutches 10, 15 and one-way clutches 14, 17 are operating. Power from the output shaft 1 of the engine is transmitted to the output shaft 2 of the torque converter via the torque converter 20. The rotation of the output shaft 2 of the torque converter is transmitted to the carrier 84 of the planetary gear mechanism 80. At this time, since the clutch 15 and the one-way clutch 17 are operating, the planetary gear mechanism 80 rotates integrally and is transmitted to the shaft 5 and further transmitted to the ring gear 63 via the clutch 10. At this time, the carrier 74 is transmitted with rotation in the opposite direction to the shaft 5, but since its rotation is restrained by the one-way clutch 14, the ring gear 73 rotates in the same direction as the shaft 5, thereby rotating the output shaft 4. At the same time, the carrier 64 also rotates in the same direction to rotate the output shaft 4, and the combined rotational force is transmitted to the output shaft 4. Note that when you want to apply engine braking, such as when driving downhill, the one-way clutch 14 will only allow the carrier 74 to rotate in the same direction, so the brake 13
is activated to restrain the rotation of the carrier 74. Second forward speed...clutches 10, 15, brake 12, and one-way clutch 17 are operating. Power from the output shaft 1 of the engine is transmitted to the shaft 5 and then to the ring gear 63 in the same manner as in the case of the first forward speed. At this time, sun gear 61 is brake 1
2, the planetary pinion 62 is caused to revolve along the sun gear 61 in the same direction as the shaft 5 by the ring gear 63, and as a result, the carrier 64 rotates in the same direction and is transmitted to the output shaft 4. 3rd forward speed...clutches 10, 11, 15,
One-way clutch 17 is activated. Power from the output shaft 1 of the engine is transmitted to the ring gear 63 in the same manner as in the case of the first forward speed, and is also transmitted to the sun gear 61 via the clutch 11. Therefore, in the planetary gear mechanism 60, the ring gear 6
3 and sun gear 61 rotate in the same direction, planetary pinion 62 rotates between ring gear 63 and sun gear 61.
It is rotated in an integrated manner without relative movement, and is transmitted to the carrier 64 and then to the output shaft 4. 4th forward speed...clutches 10, 11 and brake 16 are operating. The power from the output shaft 1 of the engine is transferred to the output shaft 2 via the torque converter 20.
and conveyed to carrier 84,
It is transmitted to the sun gear 61 via the clutch 11. At this time, since the sun gear 81 is fixed by the brake 16, the ring gear 83 rotates at an increased speed than the rotation of the carrier 84 and is transmitted to the shaft 5 and further transmitted to the ring gear 63 via the clutch 11. In the planetary gear mechanism 60, due to the rotation of the sun gear 61 in the same direction as the shaft 2 and the accelerated rotation of the ring gear 63 in the same direction as the shaft 2, the carrier 64 rotates at an increased speed than the rotation of the shaft 2, and the output shaft is rotated. 4 can be conveyed. Reverse...clutches 11, 15, brakes 13
is working. Power from the output shaft 1 of the engine is transmitted to the output shaft 2 via the torque converter 20 and further transmitted to the sun gear 71 via the clutch 11. At this time, since the carrier 74 is fixed by the operation of the brake 13, the ring gear 73 is rotated by the sun gear 71 via the planetary pinion 72 in a direction opposite to the rotation of the shaft 2, and the rotation is transmitted to the output shaft 4. <Effects of the Invention> According to the present invention, the output shaft of the torque converter, which is the input element of the overdrive device, is connected to the carrier of the third planetary gear mechanism, and the output shaft of the torque converter, which is the input element of the overdrive device, is connected to the carrier of the third planetary gear mechanism, and the output shaft of the torque converter, which is the input element of the overdrive device, is connected to the carrier of the third planetary gear mechanism, and By connecting the ring gear, which is the output element of the overdrive device, to the ring gear of the first planetary gear mechanism via the clutch, the power from the output shaft of the torque converter is transferred to the overdrive when in 4th gear. The speed is increased through the drive device and transmitted to the ring gear of the first planetary gear mechanism via the clutch 10, and the power from the output shaft of the torque converter is transmitted to the sun gear of the first planetary gear mechanism via the clutch 11. The first planetary gear mechanism is configured to control the rotation of the carrier, which is an output element, in accordance with the rotation of the ring gear and sun gear, so that the overdrive ratio is controlled by the rotation of the sun gear and ring gear of the overdrive device. Since the output of the overdrive device is reduced by the first planetary gear mechanism, the overdrive ratio is set on the side where the driving force is large, around 1.0. For this reason, when applied to automobiles that require acceleration performance at high speeds such as sports cars, or vehicles with high running resistance such as wagons, 1 to
Since the overdrive ratio can be set to a relatively high driving force around 1 without changing the gear ratio of the third speed section, there is an effect that acceleration performance during high-speed running is not impaired.

[Brief explanation of the drawing]

The figure is a schematic diagram showing a power transmission mechanism of an automatic transmission with an overdrive according to the present invention. Explanation of symbols, 1... Engine output shaft, 2...
Torque converter output shaft, 3... sun gear shaft,
4... Output shaft, 5... Shaft, 10... Second clutch, 11... First clutch, 12... First brake, 13... Second brake, 14... One-way clutch, 15...Third clutch, 16...
Third brake, 17... one-way clutch, 20
... Torque converter, 30 ... Speed change gear device,
40... Overdrive device, 50... Output gear, 60... First planetary gear mechanism, 70... Second
planetary gear mechanism, 80... third planetary gear mechanism,
61, 71, 81...Sun gear, 62, 72, 8
2... Planetary pinion, 63, 73, 83...
...Ring gear, 64, 74, 84...Carrier.

Claims (1)

[Claims] 1 A torque converter connected to the output shaft of the engine, a speed change gear device having first and second planetary gear mechanisms, and a third planetary gear mechanism disposed between the torque converter and the speed change gear device. An overdrive device and an output gear disposed between the overdrive device and the transmission gear device are respectively arranged concentrically, and the output shaft of the torque converter is connected to the carrier of the third planetary gear mechanism. and a ring gear of the third planetary gear mechanism is connected to the sun gears of the first and second planetary gear mechanisms via a first clutch, and a ring gear of the third planetary gear mechanism is connected to the sun gears of the first and second planetary gear mechanisms through a first clutch.
A carrier of the first planetary gear mechanism and a ring gear of the second planetary gear mechanism are connected to the output gear through a clutch of the first and second planetary gear mechanism. a sun gear of the second planetary gear mechanism includes a first brake;
The carrier of the second planetary gear set includes a second brake, the carrier of the third planetary gear set is connected to the sun gear of the third planetary gear set via a third clutch, and the carrier of the third planetary gear set is coupled to the sun gear of the third planetary gear set via a third clutch. The sun gear of the planetary gear mechanism includes a third brake;
It is characterized by being configured to obtain a gear ratio of four forward speeds and one reverse speed, including an overdrive ratio, by selectively operating the second and third clutches and the first, second and third brakes. Automatic transmission with overdrive.