KR0142474B1 - 4 speed gear train for a vehicle - Google Patents

Abstract

For the purpose of improving the feeling of shifting by the action of the one-way clutch when shifting from the third range to the third speed of the D range; It is made by combining the double pinion planetary gear unit and the single pinion planetary gear unit, so that the sun gear and the ring gear can be shared, and the first carrier of the double pinion planetary gear unit is selectively reacted and the input element, and the single pinion A peripheral speed portion configured to make the second carrier of the planetary gear unit an output element; A sub-transmission part comprising a single pinion planetary gear unit, wherein the ring gear is always an input element, the sun gear and the carrier are selectively reaction elements, and the carrier is always an output element; First and second clutches for intermittent transmission of power of the input shaft to the two operating elements of the peripheral speed; First and second brakes operative to operate two of the four operating elements of the peripheral speed selectively as a reaction force element; A third brake operative to selectively operate one actuating element of the sub transmission part as a reaction force element; A third clutch for selectively connecting two actuating elements of the sub transmission part; It provides a gear train of a four-speed automatic transmission for a vehicle comprising a first, a two-way clutch to selectively prevent the reverse rotation of one operating element of the peripheral speed portion and the sub transmission.

Description

Gear train of car 4-speed automatic transmission

1 is a stick diagram of a gear train according to the present invention.

FIG. 2 is an operation table of the friction elements for each shift stage, which enables the gear train of FIG. 1 to have a gear ratio of 4 forward speed and 1 reverse speed.

The present invention relates to a gear train of a four-speed automatic transmission for a vehicle, and more particularly, a gear train of a four-speed automatic transmission for a vehicle in which a shifting feeling can be improved by the action of a one-way clutch when shifting from the D range three speeds to four speeds. It is about.

For example, an automatic transmission for a vehicle includes a planetary gear device connected between a torque converter and a driven shaft.

The planetary gear device includes a sun gear, a plurality of planet gears, a planet carrier connecting the planet gears, and a ring gear.

And the gears of the planetary gear device outputs the required speed ratio and power while being controlled by the operation of a plurality of clutches and brakes (friction elements) that are operated by the control of the hydraulic shift control device according to the driving conditions of the vehicle.

The automatic transmission for a vehicle is formed of a transmission unit and a main transmission unit in order to output the gear ratio in multiple stages, and a plurality of clutches and brakes are disposed in place to facilitate shift control.

However, in the conventional automatic transmission as described above, the shift is performed only by the operation of the friction member and the non-operation control when shifting from the 3rd speed to the 3rd speed of the D range, and thus there is a problem that the shifting shock is generated and the shifting feeling is not good. .

Therefore, the present invention has been invented to solve the above problems, an object of the present invention is a four-speed automatic transmission for a vehicle that can be improved by the action of the one-way clutch when shifting from the D range 3 speed to 4 speed. Would like to provide a gear train.

In order to realize this, the present invention includes a planetary gear set including a planetary gear set that rotates or non-rotates with selective operation of friction elements by hydraulic control means controlled by a transmission control unit according to the vehicle speed and the degree of opening of the throttle valve. In an automatic transmission having a shift mechanism, the double pinion planetary gear unit and the single pinion planetary gear unit are combined to allow sharing of sun gear and ring gear, and selectively reacting the first carrier of the double pinion planetary gear unit. And a peripheral speed portion configured to be an input element, the second carrier of the single pinion planetary gear unit being an output element; A sub-transmission part comprising a single pinion planetary gear unit, wherein the ring gear is always an input element, the sun gear and the carrier are selectively reaction elements, and the carrier is always an output element; First and second clutches for intermittent transmission of power of the input shaft to the two operating elements of the peripheral speed; First and second brakes operative to operate two of the four operating elements of the peripheral speed selectively as a reaction force element; A third brake operative to selectively operate one actuating element of the sub transmission part as a reaction force element; A third clutch for selectively connecting two actuating elements of the sub transmission part; It provides a gear train of a four-speed automatic transmission for a vehicle comprising a first, a two-way clutch to selectively prevent the reverse rotation of one operating element of the peripheral speed portion and the sub transmission.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can be specifically realized for the above purpose will be described in detail.

1 is a diagram illustrating a gear train of an automatic transmission according to the present invention, in which a gear train receives an input shaft 6 rotating through an engine 2 and a torque converter 4 and a rotational force of the input shaft 6. It consists of the main transmission part 8 which performs a primary shift according to the driving condition of a vehicle, and the sub transmission part 10 which performs a secondary shift of the rotational force output from the said main transmission part 8.

The torque converter 4 includes a pump impeller 12 which rotates in direct connection with the crankshaft of the engine 2; A turbine runner 14 disposed opposite to the pump impeller 12 and ejected to rotate together with oil; It is provided between the pump impeller 12 and the turbine runner 14 includes a stator 16 for changing the flow of oil to increase the rotational force of the pump impeller 12.

Peripheral speed 8 disposed at the distal end of the input shaft 6 connected to the turbine runner 14 is formed of a composite planetary gear set consisting of a combination of a double pinion planetary gear unit 18 and a single planetary gear unit 20. .

In the combination of the double pinion planetary gear unit 18 and the single planetary gear unit 20, the ring gear and the sun gear of the two planetary gear units 18 and 20 are integrated into one ring gear 22 and the sun gear ( 24, the first and second pinions 26 and 28 and the third pinion meshed between the sun gear 22 and the ring gear 24 and between the ring gear 22 and the sun gear 24. The first and second carriers 32 and 34 connecting 30 are formed as actuation elements.

In addition, a plurality of operating elements other than the second carrier 34 of the single pinion planetary gear unit 20 serving as an output element among the operating elements 22, 24, 32, and 34 of the peripheral speed 8 may be provided. By the frictional elements of the input shaft 6 and the transmission housing 36 is connected to operate as an input or reaction force element.

That is, the ring gear 22 is the first brake (B1) to act as a reaction element in the R range and L range 1 speed, and the first one-way clutch (1) to act as a reaction element in the D range 1 speed ( It is connected with the transmission housing 36 via F1).

The sun gear 22 is connected via the first shaft transmission member 38 and the first clutch C1 via the first power transmission member 38 without rotation interference on the outside of the input shaft 6. At this stage, the sun gear 22 acts as an input element.

In addition, the first carrier 32 of the double pinion planetary gear unit 10 is connected to the input shaft 6 through the second clutch C2 to act as an input element at the R and D ranges 3 and 4, In addition, the first carrier 32 thereof is connected to the transmission housing 36 via the second brake B2 to act as a reaction force element at the D range 2 speed.

The second carrier 34 of the single pinion planetary gear unit 20 serves as an output element as described above, and the output gear 40 is mounted at an end thereof.

The secondary transmission 10 receiving the rotational power from the output gear 40 to perform the second shift is a sun gear 42, a pinion 44 engaged with the outer shaft thereof, and a ring inscribed with the pinion 44 thereof. It consists of a single-pinion planetary gear unit consisting of a gear 46, the rotation shaft 48 for rotatably supporting the sun gear 42 is a transmission via a third brake (B3) and the second one-way clutch (F2). It is connected to the housing 36 and acts as a reaction force element in all the shift stages except the D range 4 speed.

In addition, the carrier 48 supporting the pinion 44 has an output gear 50 formed at one end thereof so as to act as an output element, and is connected to the differential 52, and the other end thereof has the rotation shaft 47. ) And the third clutch C3 are connected to each other to act as an input element at D range 4 speed.

In addition, the ring gear 46 has an input gear 54 formed on the outside thereof so as to be engaged with the output gear 40 of the peripheral speed portion 8, thereby acting as an input element in the entire speed change region.

Reference numeral 56 in the drawing is a one-way clutch that prevents the stator 16 from rotating in the opposite direction of the engine rotation direction.

The four-speed transmission device of the present invention made as described above is controlled by the hydraulic control device so that the operation elements acting for each shift stage, that is, from the first forward to the fourth speed and the reverse first speed shifting action are made by the operation table of FIG. do.

[P Range]

The P range is used to stop or park the vehicle. In this range, the parking spike is stopped by the parking lever that is operated by the driver without any operating elements and stops the rotation of the output shaft. .

[R Range]

R range is the reverse range, the second clutch (C2), the first brake (B1), and the third brake (B3) is operated by the hydraulic control device to the reverse shift, wherein the rotational force of the input shaft (6) Is input to the first carrier 32 by the operation of the second clutch C2 and the ring gear 22 acts as a reaction force element by the operation of the first brake B1.

Then, the first and second pinions 26 and 28 rotate and rotate the sun gear 24 by rotating the first carrier 32, and the third pinion 30 by rotating the sun gear 24. In this case, the ring gear 22 is fixed, and the third pinion 30 rotates while the second pinion 34 rotates in a direction opposite to the direction of engine rotation while rotating. will be.

In addition, when the rotational power that is shifted backward from the main transmission portion 8 is input to the ring gear 46 of the sub transmission portion 10, the third brake B3 is operated, whereby the sun gear 42 is a reaction force element. The deceleration is made while the reverse shift is made in the process of being transmitted to the differential 52 through the output gear 50.

[D range 1 speed]

When the shift lever is selected as the D-lay, the transmission control unit controls the first clutch C1 and the third brake B3 through the hydraulic control device.

Then, the rotational force of the input shaft 6 drives the first power transmission member 38 through the first clutch C1 to drive the sun gear 24 mounted thereto.

As such, when the first election gear 24 is driven, the rotational force of the first election gear 24 rotates the first, second, and third pinions 26, 28, 30, wherein the ring gear 22 is the first one-way clutch ( The first carrier 32 is rotated in a free state by the rotational force input to the second and first pinions 28 and 26 by F1) and the third pinion 30. By rotating and rotating the second carrier 34 is made while the output is made.

When the rotational power output from the main transmission portion 8 is input to the ring gear 46 of the sub transmission portion 10, the third brake B3 is operated, whereby the sun gear 42 has a reaction force element. As the deceleration is made, the gear is shifted to the forward 1 speed as the process is transmitted to the differential 52 through the output gear 50.

[D range 2 speed]

When the vehicle speed is gradually increased in the state of the first speed, the hydraulic control device is operated by the transmission control unit to operate the second brake B2 while maintaining the operation of the first clutch C1.

Then, the rotational force of the input shaft 6 drives the first power transmission member 38 through the first clutch C1 to drive the sun gear 24 mounted thereto.

When the first sun gear 24 is driven as described above, the rotational force of the first sun gear 24 rotates the first, second, and third pinions 26, 28, and 30, wherein the first carrier 32 is the second brake B2. Acting as a reaction force element, the second carrier 34 acts as an output element and outputs at a higher speed than the first speed.

When the rotational power output from the main transmission portion 8 is input to the ring gear 46 of the sub transmission portion 10, the third brake B3 is operated, whereby the sun gear 42 has a reaction force element. As the deceleration is made, the gear is shifted to the second forward speed in the process of being transmitted to the differential 52 through the output gear 50.

[D range 3 speed]

When the vehicle speed gradually increases in the state of the second speed, the hydraulic control device operates the second clutch C2 and the third brake B3 while maintaining the operation of the first clutch C1 by the transmission control unit. do.

Then, the rotational force of the input shaft 6 is simultaneously input through the first power transmission member 32 and the first planetary carrier 32, and the main transmission 8 thereof is locked so that its rotational force is directly transmitted to the second carrier 34. ) And the output is made through the output 40.

In addition, when the rotational power output from the main transmission portion 8 is input to the ring gear 46 of the sub transmission portion 10, the third brake B3 is operated, whereby the sun gear 42 has a reaction force element. As the deceleration is made, the gear is shifted to the third forward speed in the process of being transmitted to the differential 52 through the output gear 50.

[D range four speed]

When the vehicle speed gradually increases in the state of the third speed, the hydraulic control device controls the second and third clutches C2 and C3 while the operation of the first clutch C1 is maintained by the transmission control unit.

Then, the output is made in the same manner as the third speed in the main transmission part 8, and the operation of the third brake B3 is stopped in the sub transmission part 10 that receives the rotational power, and the third clutch ( Since the operation of C3) is performed, the sun gear 42 and the carrier 48 act as a reaction force element, so that the sub transmission 10 is locked and output in a direct connection, so that the driving in the fourth speed state is performed. Will be done.

At this time, the second one-way clutch (F2) is in a full-wheeling state when the operation of the third brake (B3) is released, does not interfere with the rotation of the rotary shaft 47, shifting when shifting from three to four speed The shock does not occur at all.

In the gear train of the automatic transmission for shifting by the above operation, the same action as the D range 1, 2 speed in the 2L range, but the shift is not made more than 3 or 2 speed depending on the selected range. It is only.

As described above, in the gear train of the present invention, the first sun gear acts as an input element in all regions of the D range, and a change in the input element does not occur even when skipping shift, thereby increasing the feeling of shifting.

In addition, the shift shock is not generated by the action of the second one-way clutch during the shift from the D range 3 speed to the 4 speed, so that the feeling of shifting can be greatly improved.

Claims (8)

Automatic transmission with a multistage gear shifting mechanism, including a planetary gear set that rotates or nonrotates with selective operation of friction elements by hydraulic control means controlled by the transmission control unit according to the vehicle speed and the degree of opening of the throttle valve. In this case, the double-pinion planetary gear unit and the single-pinion planetary gear unit are combined, so that the sun gear and the ring gear can be shared, and the first carrier of the double-pinion planetary gear unit is selectively reacted and input elements, A peripheral speed portion configured to make the second carrier of the single pinion planetary gear unit an output element; A sub-transmission part comprising a single pinion planetary gear unit, wherein the ring gear is always an input element, the sun gear and the carrier are selectively reaction elements, and the carrier is always an output element; First and second clutches for intermittent transmission of power of the input shaft to the two operating elements of the peripheral speed; First and second brakes operative to operate two of the four operating elements of the peripheral speed selectively as a reaction force element; A third brake operative to selectively operate one actuating element of the sub transmission part as a reaction force element; A third clutch for selectively connecting two actuating elements of the sub transmission part; A gear train of a four-speed automatic transmission for a vehicle, comprising first and second one-way clutches to selectively prevent the reverse rotation of one operation element of the peripheral speed portion and the sub transmission portion. The gear of the four-speed automatic transmission according to claim 1, wherein the first clutch is disposed on the input shaft and the first power transmission member so as to transmit rotational force of the input shaft to the sun gear of the peripheral speed at all the shift stages of the D range. Train. The four-speed automatic transmission for a vehicle according to claim 1, wherein the second clutch is disposed between the input shaft and the first carrier so as to transmit rotational force of the input shaft to the first carrier of the peripheral speed at the R and D ranges 3 and 4. Gear train. The gear train of claim 4, wherein the first brake is disposed between the ring gear and the transmission housing so that the ring gear of the peripheral speed can act as a reaction element at the R and L range 1 speeds. 2. The gear train of claim 4, wherein the second brake is disposed between the first carrier and the transmission housing so that the first carrier of the peripheral speed acts as a reaction element in the D 2 range 2 speed. The gear train of claim 4, wherein the third clutch is disposed between the carrier and the rotational shaft so as to connect the carrier of the secondary transmission to the rotational shaft, which is a sun gear shaft, in the fourth speed range D. 2. The vehicle of claim 4, wherein the third brake is disposed between the rotational shaft and the transmission housing so that the sun gear of the sub transmission can be operated as a reaction force element in all the shift stages except the D range fourth speed. Train. 2. The first one-way clutch of claim 1, wherein the first one-way clutch is disposed in the ring gear and the transmission housing so that the ring gear of the peripheral speed can operate as a reaction force element in the D range 1 speed and the 2 range 1 speed. A gear train of a four-speed automatic transmission for a vehicle, characterized in that it is disposed in the transmission shaft and the transmission housing so as to be full-wheeled at the D-range four speed.