KR20110083450A - Automatic transmission system for vehicle - Google Patents

Abstract

PURPOSE: A continuous automatic speed change system of vehicles is provided to automatically comprise the torque implementation and speed change of a vehicle by a kinematic property of a planetary gear apparatus, thereby enabling simplifications. CONSTITUTION: A sub fluid type power transmission apparatus(22) is connected to an automotive engine shaft. A planetary gear apparatus(24) is connected to the automotive engine shaft and sub fluid type power transmission respectively. The automotive engine shaft(2) connects to the sub fluid type power transmission apparatus and planetary gear apparatus at the same time. The torque is delivered to the sub fluid type power transmission apparatus and planetary gear apparatus. A sub pump impeller(222) revolves with the same number of rotation as the automotive engine shaft.

Description

Continuous transmission system of a vehicle {Automatic transmission system for vehicle}

The present invention relates to a continuously variable automatic transmission system of a vehicle, and more particularly, a transmission module applied to various vehicles such as a passenger car, a bus, and a truck is made of a combination of a planetary gear mechanism and a torque transmission unit, and is separated from the transmission module. Control of the hydraulic power transmission mechanism and the planetary gear mechanism automatically according to the rotational speed of the vehicle engine shaft controlled by the accelerator operated by the vehicle driver even if the brake mechanism and the clutch mechanism of the vehicle are not installed. It relates to an automatic transmission system.

The transmission of the vehicle is installed between the engine shaft that receives torque from the engine of the vehicle and rotates the axle that drives the driving wheels that move the vehicle, and stops, slows, speeds, accelerates, and decelerates. It is a device that controls the torque and speed required to drive a vehicle under each driving condition such as parking and parking.

In general, the vehicle shifting device is equipped with a plurality of gears with different gear teeth to realize a shifting stage of the first to fifth gears, and the torque and speed required in each driving condition while changing gears for each shifting stage. Allow the vehicle to drive. Various transmissions have been developed and are currently in use to implement this, a manual transmission in which the gear is directly operated by the vehicle driver, an automatic transmission in which the gear is automatically operated according to the speed of the vehicle, There are continuously variable automatic transmissions that allow the transmission to be carried out continuously using pulleys or chains.

Here, the automatic transmission is made of a combination of a fluid power transmission mechanism such as a fluid clutch or a torque converter and a planetary gear mechanism, and the vehicle driver uses P (Parking), R (Reverse), N ( If a driving selection mode consisting of Neutral), D (Drive), 2 (Second), and L (lock-up) is selected, the gear is automatically operated according to the selected driving selection mode to shift.

As a technology related to such an automatic transmission, Korean Patent Publication No. 10-1995-0000045 "Unauthorized Automatic Transmission", Registered Patent Publication No. 10-0290390 "Automatic Transmission", Registration No. 10 Patent Application Publication No. 10-1996-0040756, "Automatic Transmission for Vehicles" Publication No. 10-1998-030064, "Stepless Transmission for Automobiles" and the like.

On the other hand, Republic of Korea Patent Publication No. 10-0637799 is a stepless automatic transmission system for transmitting power from the engine input shaft to the engine output shaft via the automatic transmission fluid as shown in Figure 1, the automatic transmission fluid from the engine input shaft An impeller for transmitting power, a turbine that rotates in response to a fluid flow by the impeller, and a stator for guiding a reaction fluid to the impeller to double the torque so as to prevent recoil of the automatic transmission fluid flowing by the turbine. A torque converter 10 which shifts by a speed ratio difference between the impeller and the turbine and transmits the same to the transmission input; The first is arranged on the axis between the engine input shaft and the engine output shaft with a predetermined interval, respectively, consisting of a sun gear 20S, a ring gear 20R and a planetary carrier 20C, respectively shifting the power transmitted from the outside And second planetary gear sets 20a and 20b; A first multi-plate clutch 30a and the first gear provided between the first planetary gear set and the second planetary gear set to transmit an output through the first planetary gear set 20a to the second planetary gear set 20b. A second multi-plate clutch 30b installed at a portion of the second planetary gear set 20b to mediate power transmission through the second planetary gear set; In reverse operation, it includes a multi-plate brake 40 which fixes the planetary carrier 20C of the second planetary gear set 20b, wherein the sun gear 20S of the first planetary gear set 20a is the shaft of the impeller. Serially connected to (10I) to receive power directly from the engine, and the ring gear (20R) of the first planetary gear set (20a) is in series with the shaft (10T) of the turbine and fluctuates from the torque converter (10). The transmission of the output, the planetary carrier 20C of the first planetary gear set (20a) is a stepless automatic transmission system of the configuration in which the outputs respectively input to the sun gear 20S and the ring gear (20R) is combined and outputted have.

Here, the continuously variable automatic transmission system is a system in which a shift is made by a speed ratio between a rotational speed of a pump impeller constituting a torque converter and a rotational speed of a turbine rotating by a power transmitted through a fluid. A first multi-plate clutch is installed between the second planetary gear set and the output of the first planetary gear set to the second planetary gear set, and a second multi-plate clutch is installed on the second planetary gear set. Since the torque converter and the planetary gear set alone cannot cope with the torque required for low-speed driving of the vehicle, it is possible to smoothly transmit power by adjusting the operation amount of the first multi-plate clutch by detecting the vehicle speed and acceleration state. To be done.

Thus, the continuously variable automatic transmission system is a configuration in which a plurality of multi-plate clutches are provided in addition to the torque converter and the planetary gear set, so that the apparatus configuration for shifting the vehicle is complicated, thereby increasing the manufacturing cost, and the driver of the vehicle is not only a transmission device but also a plurality of multi-plate clutches. There was a problem in driving the vehicle according to the operation, and a separate control mechanism for controlling the operation of the planetary gear set, such as a multi-plate clutch operated by sensing the vehicle speed and acceleration state as described above, had to be installed.

In addition, Korean Laid-Open Patent Publication No. 10-1996-0040756, as shown in FIG. 2, constitutes an automatic transmission by combining a known three-element single-stage torque converter having a maximum torque ratio of 2.5 to 3, a planetary gear device, and an auxiliary transmission. In this case, the input shaft (5) for concentrically coupling the pump (2) of the torque converter and the sun gear (7) of the planetary gear device is provided, and the input shaft is connected to the engine via the friction clutch (1) to the engine The output shaft 6 of the torque converter, which concentrically couples the ring gear 10 of the planetary gear device and the turbine 3 of the torque converter, is transmitted to the pump 2 and the sun gear 7. Installed to transmit the power of the turbine 3 to the ring gear 10, and when the vehicle reaches a constant traveling speed from the start of the vehicle or reverse rotation of the ring gear 10 (in a direction opposite to the engine rotation direction). Rotation speed decreases below a certain value. Install a band brake 11 in which the frictional force is applied in a direction to reduce the reverse rotational speed of the ring gear 10 by applying a constant frictional force to the ring gear 10 until the time is reached, and the sun gear By connecting the rotational shaft of the conveying carrier 9 connected to the pinion gear 8 geared between the gear 7 and the ring gear 10 to the input shaft 25 of the auxiliary transmission, the change in the running resistance of the vehicle and the rotational force of the engine And the rotational force and the rotational speed of the torque converter change according to the change of the rotational speed, and the rotational force and the rotational speed of the ring gear 10 change according to the change of the rotational force of the torque converter and the frictional force of the band brake 11. Disclosed is a vehicle automatic transmission having a configuration in which the rotational force and the rotational speed of the carrier 9 are changed in accordance with the above various factors.

However, the vehicular automatic transmission device, like the aforementioned continuously variable automatic transmission system, is provided with a band brake (1) which acts on the ring gear forming the planetary gear device to reduce the reverse rotational speed of the ring gear. Since there is still a problem that the configuration of the device for shifting the vehicle is complicated to control the movement, the system is shifted while being affected by the change of the torque of the torque converter and the change of the friction of the band brake. There was a problem that the fuel economy of the vehicle is lowered by causing the consumption of, and in particular, there is a problem that a separate control mechanism for controlling the operation of the planetary gear set, such as the band brake has to be installed.

Therefore, the present invention improves the problems of the prior art, the shift module is implemented by a combination of the planetary gear mechanism and the torque transmission unit, a separate brake mechanism or clutch mechanism for controlling the operation of the planetary gear mechanism constituting the shift module Is installed in a state in which the operation of the planetary gear mechanism and the torque transmission unit is automatically controlled by interlocking with the rotational speed of the vehicle engine shaft controlled by an accelerator operated by the driver of the vehicle even when the engine is not installed. Accordingly, an object of the present invention is to provide a stepless automatic transmission system of a new type of vehicle that does not require installation of a separate control mechanism for controlling a planetary gear mechanism and a torque transmission unit constituting a transmission module.

According to a feature of the present invention for achieving the above object, the present invention is coupled to the ring gear and the planetary gear is rotated in conjunction with the sun gear and the planetary gear connected to the sun gear connected to the vehicle engine shaft and A transmission module including a planetary gear mechanism having a carrier connected to the axle to drive the axle, and a torque transmission unit interposed between the sun gear and the ring gear to interlock with the planetary gear; Including an acceleration operation module for adjusting the rotational speed of the engine shaft, the vehicle stops, low-speed driving, high-speed driving, accelerated driving while absorbing the torque of the planetary gear through the torque transmission unit when the planetary gear idles The control of the transmission module for decelerating driving and parking is automatically performed by the rotational speed of the vehicle engine shaft controlled by the acceleration operation module operated by the driver of the vehicle.

In the continuously variable automatic transmission system of the present invention, the transmission module is rotated in conjunction with the sub-pump impeller and the sub-pump impeller connected to the vehicle engine shaft and any one selected from the planetary gear mechanism and the torque transmission unit and Sub fluidized power transmission mechanism including a sub turbine to be connected is characterized in that it is further provided.

Here, the sub-fluid power transmission mechanism may be any one selected from fluid coupling and torque converter.

In the continuously variable automatic transmission system of the present invention as described above, the torque transmission unit includes a sub sun gear connected to the planetary gear; It may be configured to include a fluid power transmission mechanism including a pump impeller connected to the sub-sun gear, and a turbine that rotates in conjunction with the pump impeller and is connected to a ring gear of the planetary gear mechanism.

The torque transmission unit includes a sub ring gear connected to the planetary gear; It may be configured to include a fluid power transmission mechanism including a pump impeller connected to the sub ring gear, and a turbine that rotates in conjunction with the pump impeller and is connected to the ring gear of the planetary gear mechanism.

Here, the planetary gear is formed in a double gear shape in which the gear teeth are arranged in two rows, the fluid power transmission mechanism is any one selected from the group of fluid coupling (fluid coupling), fluid clutch (fluid clutch), pump It is characterized by.

In the continuously automatic transmission system of the present invention as described above, the acceleration operation module is characterized in that the accelerator (accelerator) installed in the vehicle is operated by the driver's foot movement.

In the continuously variable automatic transmission system of the present invention, the planetary gear mechanism of the shift module is installed between any one selected from the sun gear and the ring gear and the carrier to connect any one selected from the sun gear and the ring gear and the carrier. The lock clutch disk, which is integrally coupled and is installed in the vehicle and operated by the clutch pedal operated by the driver, is provided so that the vehicle has a speed higher than a predetermined set value. The disk is operated such that the speed of the vehicle is increased while the sun gear, the ring gear and the carrier rotate at the same rotational speed as the engine shaft of the vehicle.

In the continuously variable automatic transmission system of the present invention as described above, the shift module is further provided with an auxiliary planetary gear mechanism and a plurality of auxiliary clutches installed between the carrier and the axle of the planetary gear mechanism. The gear mechanism is coupled to the sub-ring gear and the sub- planetary gear connecting to the sub-sun gear and the sub-ring gear which rotates in conjunction with the sub- planetary gear and is connected to the axle to drive the axle. A second sub-clutch having a carrier, wherein the sub-clutch is provided between the housing in which the transmission module is installed and the sub-sun gear, and the second sub-clutch installed between the housing and the sub-carrier. A third sub-clutch installed between the housing and the sub-ring gear, a fourth sub-clutch installed between the sub-ring gear and the axle, A fifth sub-clutch installed between the existing sub-carrier and the axle, a sixth sub-clutch installed between the carrier and the sub-carrier, a seventh sub-clutch installed between the carrier and the sub-sun gear, and the carrier And an eighth sub-clutch installed between the axle and the axle.

According to the continuously variable automatic transmission system of the present invention, a separate brake mechanism or clutch mechanism is required for the operation of the planetary gear mechanism as the vehicle shift and torque implementation are automatically performed by the mechanical characteristics of the planetary gear mechanism. It is possible to configure a shifting system without a configuration, which simplifies the configuration and reduces manufacturing costs.

In addition, the vehicle driver can freely implement the shifting of the vehicle and the required driving torque only by the operation of the accelerator, thereby improving the driving ability of the driver.

In addition, since the shift of the vehicle can be made without interference of a separate control mechanism, the driving response of the vehicle is improved, and the fuel efficiency of the vehicle is also increased.

1 is a block diagram of a conventional continuously variable automatic transmission system;
2 is a block diagram of a conventional vehicle automatic transmission;
3 is a block diagram showing the configuration of a continuously variable automatic transmission system of a vehicle according to the present invention;
4 is a view for showing the configuration of a continuously variable automatic transmission system of a vehicle according to a first embodiment of the present invention;
5 is a view for showing the configuration of a continuously variable automatic transmission system of a vehicle according to a second embodiment of the present invention;
6 is a view for showing the configuration of a continuously variable automatic transmission system of a vehicle according to a third embodiment of the present invention;
7 is a view showing the configuration of a continuously variable automatic transmission system of a vehicle according to a fourth embodiment of the present invention;
8 is a view for showing the configuration of a continuously variable automatic transmission system of a vehicle according to a fifth embodiment of the present invention;
9 is a view for showing the configuration of a continuously variable automatic transmission system of a vehicle according to a sixth embodiment of the present invention;
10 (a) is a graph showing a relationship between vehicle speed and engine speed of each stage of a conventional vehicle transmission;
10 (b) is a graph showing the relationship between the vehicle speed and the engine speed of the continuously variable automatic transmission system of the vehicle according to the present invention;
FIG. 11A is a graph showing a relationship between vehicle speed and driving force (back climbing capability) for each stage of a conventional vehicle transmission; FIG.
11 (b) is a graph showing the relationship between the vehicle speed and the driving force (climbing ability) of the continuously variable automatic transmission system of the vehicle according to the present invention;
12 (a) is a graph showing the relationship between the vehicle speed and the rotational speed of each element of the planetary gear mechanism forming the continuously variable automatic transmission system of the vehicle according to the first embodiment of the present invention;
12 (b) is a graph showing the relationship between the vehicle speed and the rotational speed of each element of the planetary gear mechanism forming the continuously variable automatic transmission system of the vehicle according to the second embodiment of the present invention;
FIG. 13A is a graph showing the relationship between the torque ratio of the carrier and the vehicle engine shaft to the rotational speed of the carrier constituting the planetary gear mechanism of the continuously variable automatic transmission system of the vehicle according to the first embodiment of the present invention; FIG.
Figure 13 (b) is a graph showing the relationship between the torque ratio of the carrier and the vehicle engine shaft to the rotational speed of the carrier forming the planetary gear mechanism of the continuously variable automatic transmission system of the vehicle according to the second embodiment of the present invention.

The continuously variable automatic transmission system 100 of the vehicle according to the present invention is applied to a vehicle driven by various engines such as a gasoline engine, a diesel engine, a gas engine, or an electric motor, and is also applied to various vehicle models such as a passenger car and a bus. It can be used. The continuously variable automatic transmission system 100 according to the present invention controls the torque and the speed required to drive the vehicle in accordance with the respective driving conditions, such as vehicle stop, low speed driving, high speed driving, acceleration driving, deceleration driving, parking Done.

The continuously variable automatic transmission system 100 of the vehicle according to the present invention has torque transmission in which a planetary gear mechanism 24, a fluid coupling, a fluid clutch, a pump, and the like may be used, as shown in FIG. The shift module 20 is implemented by a combination of the units 28, and even if a separate brake mechanism or clutch mechanism for controlling the operation of the planetary gear mechanism 24 constituting the shift module 20 is not installed, It is a technical feature that the planetary gear mechanism 24 and the torque transmission unit 28 are automatically operated in conjunction with the rotational speed of the vehicle engine shaft 2 controlled by the accelerator 42 operated by the engine. . Accordingly, the driving of the vehicle can be made simply and easily, and the driving ability of the vehicle driver can be improved.

In particular, the continuously variable automatic transmission system 100 of the vehicle according to the present invention does not have a separate operation mechanism for shifting the vehicle, and the operation of the transmission module 20 is controlled by an accelerator 42 in which the vehicle is generally installed. As the gears that are controlled and idle in the plurality of gears provided for shifting are eliminated, fuel economy of the vehicle is improved.

In addition, the continuously variable automatic transmission system 100 of the vehicle according to the present invention is preferably operated in conjunction with various controllers provided in the vehicle, including an engine controller, a controller of a fluid machine installed in the vehicle, and the like. As the optimal driving conditions of the continuously variable automatic transmission system 100 of the present invention are interlocked with each other, the vehicle is driven at the optimum efficiency.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 4 to 9. On the other hand, in the drawings and detailed description of the structure and operation that can be easily understood by those skilled in the art from the conventional vehicle transmission, automatic transmission, continuously variable transmission and the like, briefly or omitted. In particular, in the drawings and detailed description of the drawings, detailed descriptions and illustrations of specific technical configurations and operations of elements not directly related to technical features of the present invention are omitted, and only the technical configurations related to the present invention are briefly shown or described. It was.

4 is a view showing the configuration of a continuously variable automatic transmission system of a vehicle according to a first embodiment of the present invention, Figure 5 is a view showing the configuration of a continuously variable automatic transmission system of a vehicle according to a second embodiment of the present invention 6 is a view illustrating a configuration of a continuously variable automatic transmission system of a vehicle according to a third embodiment of the present invention, and FIG. 7 is a view of a continuously variable automatic transmission system of a vehicle according to a fourth embodiment of the present invention. 8 is a view illustrating a configuration, and FIG. 8 is a view illustrating a configuration of a stepless automatic transmission system of a vehicle according to a fifth embodiment of the present invention, and FIG. 9 is a stepless illustration of a vehicle according to a sixth embodiment of the present invention. The figure shows the configuration of the automatic transmission system.

The continuously variable automatic transmission system 100 of the vehicle according to the first embodiment of the present invention includes a shift module 20 and an acceleration operation module 40 as shown in FIG. 4.

The transmission module 20 includes a planetary gear mechanism 24, a torque transmission unit 28, a lock clutch disk 26, an auxiliary planetary gear mechanism 30, and an auxiliary clutch 32. Is done.

The planetary gear mechanism 24 is connected to the vehicle engine shaft 2. The planetary gear mechanism 24 includes a sun gear 242 in the center, a ring gear 244 and a sun gear 242 forming an edge. The carrier 246 is coupled to a plurality of planetary gears 248 installed between the ring gears 244.

Here, the sun gear 242 is rotated in connection with the vehicle engine shaft 2, the ring gear 244 is rotated in conjunction with the planetary gear 248 connected to the sun gear 242.

The carrier 246 is connected to the sun gear 242 and the ring gear 244 simultaneously by a plurality of planetary gears 248, the carrier 246 is the axle (3) for driving the drive wheels 4 of the vehicle The carrier 246 rotates the axle 3 by receiving torque from the sun gear 242 and the ring gear 244 at the same time. As the carrier 246 rotates the axle 3, the rotation speed rpm of the carrier 246 corresponds to the speed (vehicle speed) of the vehicle.

Here, the planetary gear mechanism 24 of the present invention is rotatably fixed to the fixed casing 28 without installing a separate brake mechanism or clutch mechanism to operate without restriction.

That is, the sun gear 242 of the planetary gear mechanism 24 is directly connected to the vehicle engine shaft 2 without being restrained to rotate by receiving torque directly from the vehicle engine shaft 2, and the planetary gear mechanism 24. Ring gear 244 is connected to the turbine 224 of the fluid power transmission mechanism 22 without restriction, the pump impeller 222 of the fluid power transmission mechanism 22 and the rotational speed of the turbine 224 ( The torque generated by the difference in rpm) is transmitted through the turbine 224 to rotate, and the carrier 246 receives the torque from the sun gear 242 and the ring gear 244 and rotates without any restraint. It will be delivered to the axle (3).

The torque transmission unit 28 is installed between the sun gear 242 and the ring gear 244 of the planetary gear mechanism 24 to interlock with the planetary gear 248. Such a torque transmission unit 28 is a planetary gear. The idle gear 248 absorbs the torque of the planetary gear 248 and transmits the torque to the ring gear 244 so that the rotation of the planetary gear 248 is induced. Accordingly, the planetary gear mechanism 24 has a shift function. Will be able to perform smoothly.

The torque transmission unit 28 according to the first embodiment of the present invention includes a sub sun gear 282b and a fluid power transmission mechanism 284. The sub sun gear 282b is connected to the planetary gear 248. Torque is received.

The fluid power transmission mechanism 284 is a turbine connected to the pump impeller 2842 connected to the sub sun gear 282b and the pump impeller 2842 and connected to the ring gear 244 of the planetary gear mechanism 24. It is configured to include a (2844) so that the torque transmitted through the sub sun gear (282b) can be transmitted back to the ring gear (244).

Here, the planetary gear 248 connected to the sub sun gear 282b of the torque transmission unit 28 has a double gear shape in which the gear teeth are arranged in two rows, and the sun gear (of the sub sun gear 282b and the planetary gear mechanism 24). 242 and ring gear 244 can be connected simultaneously.

In addition, the fluid power transmission mechanism 284 may use a fluid coupling, a fluid clutch, a pump, or the like.

Acceleration operation module 40 is to be operated by the vehicle driver to adjust the rotational speed of the vehicle engine shaft (2), it is generally installed in the vehicle is operated by the foot movement of the vehicle driver, the rotational speed of the vehicle engine (1) An accelerator 42 which adjusts (rpm) is used.

Here, the continuously variable automatic transmission system 100 of the vehicle according to the present invention is not provided with a separate control mechanism for operating and controlling the transmission module 20, the accelerator 42 of the acceleration operation module 40 as described above. The transmission module 20 is automatically operated in response to the rotational speed (rpm) of the vehicle operated by the torque corresponding to the rotational speed of the vehicle through the fluid power transmission mechanism 22 and the planetary gear mechanism 24 The vehicle is shifted to the axle 3 while the vehicle is shifted.

On the other hand, the continuously variable automatic transmission system 100 of the vehicle according to the present invention until the vehicle speed of a certain size after starting the vehicle as shown in Figure 10 (b) of the number of revolutions of the engine shaft 2 and the sun gear 242 In the same state, the rotation speed of the ring gear 244 is gradually increased to induce an increase in the rotation speed Wc of the carrier 246 so that the vehicle speed is increased by the carrier 246. In addition, the engine rotation speed / is a numerical value calculated according to the gear ratio of the planetary gear mechanism 24 (change of the rotation speed of the carrier 246 and the ring gear 244) in the state in which the torque of the engine 1 of the vehicle is kept constant. The vehicle speed is defined in the vehicle speed in real time at each time point, and the vehicle is driven by the output shaft carrier 246 at a torque value inversely proportional to the vehicle speed (vehicle speed) as shown in FIG.

Here, the continuously variable automatic transmission system 100 of the vehicle according to the first embodiment of the present invention configured as described above, as shown in FIG. 12A, the sun gear 242 at the start of the vehicle is the engine 1 of the vehicle. ) Rotational speed (rpm) {that is, rotational speed (Ws = We) at the same rotational speed as the rotational speed of the engine shaft 2}, the ring gear 244 is a fluid power transmission forming the torque transmission unit (28). As it is connected to the turbine 224 of the mechanism 22, the rotational speed gradually increases at the same rotational speed {Wr = Wt}, and the carrier 246 is also connected to the sun gear 242 and the ring gear 244 at the same time to torque The rotation speed is gradually increased from the stationary state while receiving.

Here, as the sub sun gear 282b is also connected to the pump impeller 222 of the fluid power transmission mechanism 22 constituting the torque transmission unit 28, the rotation speed is gradually increased at the same rotation speed {Ws' = Wp}. do.

As described above, the ring gear 244 and the carrier 246 are gradually increased until the rotation speed is the same as that of the sun gear 242, and then the planetary gear composed of the sun gear 242, the ring gear 244, and the carrier 246. The entire mechanism 24 is rotated in the same manner as the rpm of the engine 1. The torque change at this time is shown in Fig. 13A.

As described above, the transmission module 20 connected to the vehicle engine shaft 2 keeps the rotation speed and torque of the vehicle engine shaft 2 constant, but varies the rotation speed and torque of the carrier 246 corresponding to the output shaft. The mechanism is derived from the following equations derived by the mechanical properties of the planetary gear mechanism 24 constituting the shift module 20, not by a separate control mechanism.

(Formula 1) iZ = Zr / Zs (Zr = Number of ring gear gears, Zs = Number of sun gear gears)

i₂ = (Zp₁ * Zs ') / (Zs * Zp₂) (Zp₁ is the number of gear teeth of planetary gear connected to sun gear, Zp₂ is the number of gear teeth of planetary gear connected to sub sun gear, Zs' is the number of gear teeth of sub sun gear)

(Equation 2) When the torque transmission unit 28 does not work

Wr = {(1 + i₁) / i₁} * Wc- (1 / i₁) * Ws

Wc = {i₁ / (1 + i₁)} * Wr + {1 / (1 + i₁)} * Ws

Ws = (1 + i₁) * Wc-i₁ * Ws

(Equation 3) When the torque transmission unit 28 operates

Wc = {Ws- (i₂ * Ws')} / (1-i₂)

Ws' = {Ws- (1-i₂) * Wc} / i₂

Ws = (i₂ * Ws') + (1-i₂) * Wc

Here, Wr is rpm of the ring gear, Wc is rpm of the carrier, Ws is rpm of the sun gear, and Ws' is rpm of the sub sun gear.

From the above equations and relational expressions, the transmission module 20 according to the present invention has a curve in which the speed of the vehicle is inversely proportional to the driving torque of the vehicle as shown in FIG. Rotation and torque of 2) is transmitted to the axle (3), which is implemented only by the operation of the vehicle driver manipulating the accelerator 42, the stepless automatic transmission system 100 of the vehicle according to the present invention is an accelerator ( 42) The vehicle responsiveness due to the operation is increased, so that the speed change and the torque change can be realized.

That is, the speed of the vehicle can be increased while increasing the rotation speed (rpm) of the engine 1 as desired by the driver.

Here, as shown in (a) of FIG. 12, the sun gear 242, the ring gear 244, and the carrier 246 that form the planetary gear mechanism 24 so that the speed of the vehicle becomes greater than or equal to a certain size V rotate integrally. When the number of revolutions of the vehicle engine shaft 2 becomes greater than a certain size and the vehicle is traveling at high speed, the rotational speed of the vehicle engine shaft 2 by the accelerator 42 is quickly increased by the planetary gear mechanism 24. It is delivered to the axle 3 through) has the effect of increasing the driving response of the vehicle.

The lock clutch disc 26 rotates when the sun gear 242, the ring gear 244, and the carrier 246 that form the planetary gear mechanism 24 are integrally rotated because the rotation speed of the vehicle engine shaft 2 becomes greater than a predetermined size. In order to increase efficiency, the lock clutch disk 26 has the sun gear 242 and the carrier 246 meshed with each other so that the sun gear 242, the ring gear 244, and the carrier 246 are mechanically To rotate in one piece.

The operation of the lock clutch disk 26 may be performed by a lock clutch disk operation switch installed on an operation panel or a steering wheel for driving the vehicle, and the rotation speed (rpm) of the engine 1 and the carrier It is also possible to automatically operate according to the speed of the vehicle corresponding to the rotation speed of 246.

Here, the lock clutch disk 26 as described above is installed between the sun gear 242 and the carrier 246, in addition to the sun gear 242, ring gear 244, carrier 246 of the planetary gear mechanism 24 It may be installed between the two selected elements, or may be installed in the fluid power transmission mechanism 284 constituting the torque transmission unit 28.

The auxiliary planetary gear mechanism 30 and the auxiliary clutch 32 have P (Parking), R (Reverse), N (Neutral), D (Drive), L (Low drive), O / D which are provided in a general transmission. It is installed to implement a driving selection mode consisting of (over drive).

Here, the auxiliary planetary gear mechanism 30 is installed between the carrier 246 and the axle 3 of the planetary gear mechanism 24, and such an auxiliary planetary gear mechanism 30 is the auxiliary sun gear 30a. , Coupled to the auxiliary planetary gear 30d connected to the auxiliary sun gear 30a and the auxiliary ring gear 30b and the auxiliary planetary gear 30d, which are rotated in conjunction with the axle 3 to be connected to the axle ( And a sub-carrier 30c for driving 3).

In addition, the sub-clutch 32 is preferably a multi-plate clutch, a plurality of sub-clutch 32 is installed in the housing 10 in which the transmission module 20 is installed.

The auxiliary clutch 32 controls the operation of the auxiliary planetary gear mechanism 30 and the axle 3, and includes a first auxiliary clutch installed between the housing 10 and the auxiliary sun gear 30a. 321, the second sub-clutch 322 installed between the housing 10 and the sub-carrier 30c, and the third sub-clutch 323 installed between the housing 10 and the sub-ring gear 30b. ), A fourth sub-clutch 324 installed between the sub-ring gear 30b and the axle 3, and a fifth sub-clutch 325 installed between the sub-carrier 30c and the axle 3). , The sixth sub-clutch 326 installed between the carrier 246 and the sub-carrier 30c, the seventh sub-clutch 327 installed between the carrier 246 and the sub-sun gear 30a, the carrier An eighth sub-clutch 328 is provided between the 246 and the axle 3.

Here, the sub-clutch 32 used to implement the driving selection mode of P (Parking), R (Reverse), N (Neutral), D (Drive), L (Low drive), O / D (over drive) The combination of is shown in the following [Table 1].

Secondary-clutch P R N D L O / D First Aid-Clutch 0 Secondary-Clutch 0 0 Third Aid-Clutch 0 4th Auxiliary Clutch 0 0 Fifth Auxiliary-Clutch 0 0 6th Auxiliary Clutch 0 7th Auxiliary-Clutch 0 0 8th Auxiliary Clutch 0

On the other hand, as in the first embodiment of the present invention, a separate parking brake (PB) 34 may be installed, and the third sub-clutch 323 and the fourth sub-clutch 324 are negative. (Negative) may be implemented to function as a parking brake, and the second sub-clutch 322 and the fifth sub-clutch 325 may be implemented as a negative structure to serve as a parking brake. .

The continuously variable automatic transmission system 100 of the vehicle according to the second embodiment of the present invention includes a shift module 20 and an acceleration operation module 40 as shown in FIG. 4.

The shift module 20 is connected to the sub-fluid power transmission mechanism 22 which is connected to the vehicle engine shaft 2, and the engine shaft 2 and the sub-fluid power transmission mechanism 22 of the vehicle, respectively, to increase torque. It is made of a planetary gear mechanism 24 to be received.

That is, the vehicle engine shaft 2 is connected to the sub-fluid power transmission mechanism 22 and the planetary gear mechanism 24 at the same time, and thus the torque transmitted from the engine 1 of the vehicle to the vehicle engine shaft 2. Is divided and transmitted to the sub-fluid power transmission mechanism 22 and the planetary gear mechanism 24. (Theoretically, a value corresponding to 1/2 of the torque value transmitted to the vehicle engine shaft 2 is respectively sub-fluid. It is divided into the electric power transmission mechanism 22 and the planetary gear mechanism 24 and transmitted.)

The sub-fluid power transmission mechanism 22 is a mechanism for transmitting torque from the vehicle engine shaft 2 to the planetary gear mechanism 24. Such a sub-fluid power transmission mechanism 22 is the vehicle engine shaft 2; And a sub-turbine impeller 222 connected to the sub-turbine 224 and a sub-turbine 224 rotated in association with the sub-pump impeller 222 via an automatic transmission fluid such as oil.

The sub pump impeller 222 is rotated at the same rotational speed (rpm) as the vehicle engine shaft (2), the sub turbine 224 by the automatic transmission fluid flowing in accordance with the rotation of the sub pump impeller (222) The sub turbine 224 is connected to the planetary gear mechanism 24 to rotate the planetary gear mechanism 24 and transmit torque to the planetary gear mechanism 24 at the same time. do.

As the sub-fluid power transmission mechanism 22, a fluid coupling may be used such that torque transmission between the vehicle engine shaft 2 and the planetary gear mechanism 24 is performed at a ratio of 1: 1. Torque converter between the vehicle engine shaft (2) and the planetary gear mechanism 24 is a ratio of 1: N (N: 2 ~ 4) to increase the torque transmitted to the planetary gear mechanism 24 ( torque converter) may be used.

The planetary gear mechanism 24 is a mechanism that is connected to the vehicle engine shaft 2 and the sub-fluid power transmission mechanism 22 simultaneously to receive torque. The planetary gear mechanism 24 has a center sun gear 242 and a ring gear 244 formed around the edge. ), A carrier 246 coupled with a plurality of planetary gears 248 installed between the sun gear 242 and the ring gear 244.

The sun gear 242 is directly connected to the vehicle engine shaft 2 to rotate at the same rotational speed (rpm) as the vehicle engine shaft 2, while the torque corresponding to 1/2 of the torque value of the vehicle engine shaft 2. Will be delivered.

The ring gear 244 is connected to the sub turbine 224 of the sub fluid power transmission mechanism 22 to receive torque from the sub turbine 224 and rotate. The torque transmitted to the ring gear 244 is sub It has the same value as the torque transmitted to the sub turbine 224 by the automatic transmission fluid of the fluid power transmission mechanism 22.

The carrier 246 is connected to the sun gear 242 and the ring gear 244 simultaneously by a plurality of planetary gears 248, the carrier 246 is the axle (3) for driving the drive wheels 4 of the vehicle The carrier 246 rotates the axle 3 by receiving torque from the sun gear 242 and the ring gear 244 at the same time. As the carrier 246 rotates the axle 3, the rotation speed rpm of the carrier 246 corresponds to the speed (vehicle speed) of the vehicle.

Here, the planetary gear mechanism 24 of the present invention is rotatably fixed to the fixed casing 28 without installing a separate brake mechanism or clutch mechanism to operate without restriction.

That is, the sun gear 242 of the planetary gear mechanism 24 is directly connected to the vehicle engine shaft 2 without being restrained to rotate by receiving torque directly from the vehicle engine shaft 2, and the planetary gear mechanism 24. Ring gear 244 is connected to the turbine 224 of the fluid power transmission mechanism 22 without restriction, the pump impeller 222 of the fluid power transmission mechanism 22 and the rotational speed of the turbine 224 ( The torque generated by the difference in rpm) is transmitted through the turbine 224 to rotate, and the carrier 246 receives the torque from the sun gear 242 and the ring gear 244 and rotates without any restraint. Will be delivered to the axle (3).

Acceleration operation module 40 is to be operated by the vehicle driver to adjust the rotational speed of the vehicle engine shaft (2), it is generally installed in the vehicle is operated by the foot movement of the vehicle driver, the rotational speed of the vehicle engine (1) An accelerator 42 which adjusts (rpm) is used.

Here, the continuously variable automatic transmission system 100 of the vehicle according to the present invention is not provided with a separate control mechanism for operating and controlling the transmission module 20, the accelerator 42 of the acceleration operation module 40 as described above. The transmission module 20 is automatically operated in response to the rotational speed (rpm) of the vehicle operated by the torque corresponding to the rotational speed of the vehicle through the fluid power transmission mechanism 22 and the planetary gear mechanism 24 The vehicle is shifted to the axle 3 while the vehicle is shifted.

On the other hand, the continuously variable automatic transmission system 100 of the vehicle according to the present invention until the vehicle speed of a certain size after starting the vehicle as shown in Figure 10 (b) of the number of revolutions of the engine shaft 2 and the sun gear 242 In the same state, the rotation speed of the ring gear 244 is gradually increased to induce an increase in the rotation speed of the carrier 246 so that the vehicle speed is increased by the carrier 246. In addition, the engine rotation speed / is a numerical value calculated according to the gear ratio of the planetary gear mechanism 24 (change of the rotation speed of the carrier 246 and the ring gear 244) in the state in which the torque of the engine 1 of the vehicle is kept constant. The vehicle speed is defined in the vehicle speed in real time at each time point, and the vehicle is driven by the output shaft carrier 246 at a torque value inversely proportional to the vehicle speed (vehicle speed) as shown in FIG.

Here, the stepless automatic transmission system 100 of the vehicle according to the second embodiment of the present invention configured as described above, as shown in FIG. 12 (b), the sun gear 242 at the start of the vehicle is the engine 1 of the vehicle. ) Rotation speed (rpm) (that is, the rotation speed of the engine shaft 2), the ring gear 244 is connected to the turbine 224 of the fluid power transmission mechanism 22 and torque The rotational speed is gradually increased as the rotation is transmitted, and the carrier 246 is also connected to the sun gear 242 and the ring gear 244 at the same time and gradually increases the rotation speed from the stationary state while receiving torque. As described above, the ring gear 244 and the carrier 246 are gradually increased until the rotation speed is the same as that of the sun gear 242, and then the planetary gear composed of the sun gear 242, the ring gear 244, and the carrier 246. The entire mechanism 24 is rotated in the same manner as the rpm of the engine 1.

The torque change at this time is shown in FIG. 13 (b). As shown in FIG. 12 (b), when the entire planetary gear mechanism 24 rotates at the same rotation speed (rpm) as the engine 1, the carrier ( The torque of 246 is also equal to the torque of the engine 1.

As described above, the transmission module 20 connected to the vehicle engine shaft 2 keeps the rotation speed and torque of the vehicle engine shaft 2 constant, but varies the rotation speed and torque of the carrier 246 corresponding to the output shaft. The mechanism is derived from the following equations derived by the mechanical properties of the planetary gear mechanism 24 constituting the shift module 20, not by a separate control mechanism.

(1) Ts = Te / 2

(Equation 2) Tr = i * (Te / 2)

Tc = Ts + Tr = Te / 2 + i * (Te / 2) = (1 + i) * (Te / 2)

Where Te is the torque value of the sun gear, Te is the torque value of the vehicle engine shaft, Tr is the torque value of the ring gear, i = Rn / Sn (Rn is the number of gear teeth of the ring gear, Sn is the number of gear teeth of the sun gear), Tc is the carrier Is the torque value.

From the above equations and relational expressions, the transmission module 20 according to the present invention has a curve in which the speed of the vehicle is inversely proportional to the driving torque of the vehicle as shown in FIG. Rotation and torque of 2) is transmitted to the axle (3), which is implemented only by the operation of the vehicle driver manipulating the accelerator 42, the stepless automatic transmission system 100 of the vehicle according to the present invention is an accelerator ( 42) The vehicle responsiveness due to the operation is increased, so that the speed change and the torque change can be realized.

That is, the speed of the vehicle can be increased while increasing the rotation speed (rpm) of the engine 1 as desired by the driver.

Here, as shown in (b) of FIG. 12, when the speed of the vehicle becomes equal to or greater than a predetermined size (V) and the rotation speeds of the pump impeller 222 and the turbine 224 are the same, the pump impeller 222 is directly connected to the pump impeller. The planetary gear mechanism 24 is connected to the sun gear 242 rotating at the same rotational speed as 222 and the ring gear 244 connected to the turbine 224 and rotating at the same rotational speed as the turbine 224. The sun gear 242, the ring gear 244, and the carrier 246 are integrally rotated, and thus the accelerator (2) is rotated more than a certain size, and the accelerator (2) is driven when the vehicle is traveling at high speed. The rotational speed increase and decrease of the vehicle engine shaft 2 by 42 is quickly transmitted to the axle 3 through the planetary gear mechanism 24, thereby increasing the driving responsiveness of the vehicle.

On the other hand, the continuously variable automatic transmission system 100 of the vehicle according to the second embodiment of the present invention, the planetary gear 248 at idle when a plurality of planetary gears 248 installed between the sun gear 242 and the ring gear 244 The torque transmission unit 28 is further provided to prevent the torque from being dissipated.

The torque transmission unit 28 is installed between the sun gear 242 and the ring gear 244 and is linked to the planetary gear 248 connected to the carrier 246 so that the planetary gear 248 is idle when the planetary gear 248 is idle. 248 torque.

Here, the torque transmission unit 28 according to the second embodiment of the present invention is composed of a sub sun gear 282b and a fluid power transmission mechanism 284, as shown in Figure 6, the sub sun gear 282b is a planetary gear ( 248 is rotated.

The fluid power transmission mechanism 284 rotates in conjunction with the pump impeller 2842 connected with the sub sun gear 282b and the pump impeller 2842 and connects with the ring gear 244 of the planetary gear mechanism 24. It consists of a configuration including a turbine (2844), and accordingly, the fluid power transmission mechanism 284 according to the second embodiment of the present invention absorbs the torque of the planetary gear (248) of the planetary gear mechanism (24) Transfer back to ring gear 244. The torque transmission unit 28 according to the second embodiment of the present invention as described above has the advantage of easy manufacturing as the structure is simplified by the use of the sun gear.

In contrast, the torque transmission unit 28 according to the third embodiment of the present invention is composed of a sub ring gear 282a and a fluid power transmission mechanism 284, as shown in FIG. It is connected to the gear 248 to rotate.

The fluid power transmission mechanism 284 rotates in conjunction with the pump impeller 2842, which is connected to the sub ring gear 282a, and the pump impeller 2842, and is connected to the ring gear 244 of the planetary gear mechanism 24. It consists of a configuration including a turbine (2844), the fluid power transmission mechanism 284 absorbs the torque of the planetary gear 248 and is transmitted back to the ring gear 244 of the planetary gear mechanism 24 Done.

Here, the planetary gear 248 of the planetary gear mechanism 24 is formed in a double gear shape in which the gear teeth are arranged in two rows, thereby forming a sub sun gear 282b constituting the torque transmission unit 28 according to the second embodiment of the present invention. Or the sub-ring gear 282a constituting the torque transmission unit 28 according to the third embodiment of the present invention can be engaged with the planetary gear 248 of the planetary gear mechanism 24.

In addition, the fluid power transmission mechanism 284 preferably uses a mechanism capable of transmitting only torque regardless of a change in rotational speed, such as a fluid coupling, a fluid clutch, and a pump.

In addition, as shown in FIG. 9, the continuously variable automatic transmission system 100 of the vehicle according to the sixth embodiment of the present invention has two separate gears meshing with the planetary gear 248 having a double gear shape arranged in two rows. The secondary sun gear 282c is further provided, and the secondary sun gear 282c and the carrier 246 are connected to each other through a separate connection mechanism 286 so that the torque of the planetary gear 248 is applied to the secondary sun gear 282c. It may also be delivered directly to the carrier 246 via.

In FIG. 7, a fourth embodiment of the present invention is shown, a lock clutch disc 26 is provided between a sun gear 242 constituting the planetary gear mechanism 24 and a carrier 246. Such a lock clutch disc 26 is provided. The rotational speed of the vehicle engine shaft (2) is a predetermined size or more is provided for the increase in efficiency when the sun gear 242, ring gear 244, carrier 246 integrally forming the planetary gear mechanism 24 The lock clutch disk 26 is such that the sun gear 242 and the carrier 246 mesh with each other so that the sun gear 242, the ring gear 244, and the carrier 246 rotate mechanically and integrally. do.

The operation of the lock clutch disk 26 may be performed by a lock clutch disk operation switch installed on an operation panel or a steering wheel for driving the vehicle, and the rotation speed (rpm) of the engine 1 and the carrier It is also possible to automatically operate according to the speed of the vehicle corresponding to the rotation speed of 246.

In addition, as shown in FIG. 8, in which the fifth embodiment of the present invention is shown, the vehicle is equipped with a general transmission between the planetary gear mechanism 24 and the axle 3. Gear sets can be installed to function as a normal transmission.

In the continuously variable automatic transmission system 100 of the present invention configured as described above, the control of the transmission module 20 for stopping, low speed driving, high speed driving, acceleration driving, decelerating driving, and parking of the vehicle is controlled by the driver of the vehicle. Separately for controlling the fluid power transmission mechanism 22 and the planetary gear mechanism 24 as it is made automatically by the rotational speed of the vehicle engine shaft (2) controlled by the acceleration operation module 40 that is operated by It is possible to increase the fuel efficiency of the vehicle by improving the driving responsiveness of the vehicle, as well as simplifying the configuration and reducing the manufacturing cost by eliminating the need to install a control mechanism.

As described above, the stepless automatic transmission system of the vehicle according to the embodiment of the present invention has been shown in accordance with the above description and the drawings, but this is merely described, for example, and various changes without departing from the technical spirit of the present invention. And those skilled in the art will appreciate that changes are possible.

1 engine 2 engine shaft
3: axle 4: driving wheel
10: housing
20: shift module 22: sub-fluid power transmission mechanism
222: sub pump impeller 224: sub turbine
24: planetary gear mechanism 242: sun gear
244 ring gear 246 carrier
248: planetary gear 26: lock clutch disc
28: torque transmission unit 282a: sub ring gear
282b: Sub Sun Gear 282c: Secondary Sun Gear
284: fluid power transmission mechanism 2842: pump impeller
2844 turbine 286 connection mechanism
30: auxiliary planetary gear mechanism 30a: sub-sun gear
30b: sub-ring gear 30c: sub-carrier
30d: auxiliary planetary gear
32, 321, 322, 323, 324, 325, 326, 327, 328: secondary-clutch
34: parking brake 40: acceleration operation module
42: accelerator 100: stepless automatic transmission system

Claims (10)

Planetary gear mechanism including a sun gear that is connected to the vehicle engine shaft and rotates, a ring gear that is rotated in conjunction with the planetary gear connected to the sun gear, and a carrier coupled to the planetary gear and connected to the axle to drive the axle And a transmission module installed between the sun gear and the ring gear and including a torque transmission unit interlocked with the planetary gear.
Including an acceleration operation module for adjusting the rotational speed of the vehicle engine shaft,
When the planetary gear is idle, the torque of the planetary gear is absorbed through the torque transmission unit while the control of the transmission module for stopping, low speed driving, high speed driving, acceleration driving, decelerating driving, and parking of the vehicle is controlled. The stepless automatic transmission system of the vehicle, characterized in that made automatically by the rotational speed of the vehicle engine shaft adjusted by the acceleration operation module operated by a driver. The method of claim 1,
The shift module is a sub-fluid power transmission mechanism including a sub-pump impeller connected to a vehicle engine shaft and a sub-turbine that is rotated in association with the sub-pump impeller and connected to any one selected from the planetary gear mechanism and the torque transmission unit. Stepless automatic transmission system of the vehicle, characterized in that it is further provided. 3. The method according to claim 1 or 2,
The torque transmission unit may include a sub sun gear connected to the planetary gear;
And a fluid power transmission mechanism including a pump impeller connected to the sub sun gear and a turbine connected to the ring gear of the planetary gear mechanism and rotating in conjunction with the pump impeller. . The method of claim 3, wherein
The planetary gear has a double gear shape in which gears are arranged in two rows.
The fluid power transmission mechanism is a continuously variable automatic transmission system, characterized in that any one selected from fluid coupling (fluid coupling), fluid clutch (fluid clutch), the pump group is used. 3. The method according to claim 1 or 2,
The torque transmission unit includes a sub ring gear connected to the planetary gear;
And a fluid power transmission mechanism including a pump impeller connected to the sub ring gear and a turbine rotating in conjunction with the pump impeller and connected to a ring gear of the planetary gear mechanism. system. 6. The method of claim 5,
The planetary gear has a double gear shape in which gears are arranged in two rows.
The fluid power transmission mechanism may be any one selected from among a fluid coupling, a fluid clutch, and a pump group. The method of claim 2,
The sub-fluid power transmission mechanism is any one of a fluid coupling (fluid coupling) and a torque converter (torque converter), characterized in that the continuously variable automatic transmission system of the vehicle. 3. The method according to claim 1 or 2,
The acceleration operation module is a stepless automatic transmission system of the vehicle, characterized in that the accelerator (accelerator) installed in the vehicle is operated by the driver's foot movement. 3. The method according to claim 1 or 2,
The planetary gear mechanism of the transmission module is installed between any one selected from the sun gear and the ring gear and the carrier to integrally couple any one selected from the sun gear and the ring gear with the carrier, and is installed in a vehicle by a driver. To have a lock clutch disk actuated by the operated clutch pedal,
When the vehicle has a speed above a predetermined set value, the lock clutch disk is operated so that the speed of the vehicle is increased while the sun gear, the ring gear and the carrier rotate at the same rotational speed as the engine shaft of the vehicle. Continuous automatic transmission system of the vehicle. 3. The method according to claim 1 or 2,
The shift module is to be further provided with an auxiliary planetary gear mechanism and a plurality of auxiliary-clutch installed between the carrier and the axle of the planetary gear mechanism,
The auxiliary planetary gear mechanism is coupled to the auxiliary ring gear and the auxiliary planetary gear which rotates in association with the auxiliary sun gear and the auxiliary planetary gear connecting the auxiliary sun gear and is connected to the axle to drive the axle. With a sub-carrier to be made,
The sub-clutch may include a first sub-clutch installed between the housing in which the shift module is installed and the sub-sun gear, a second sub-clutch installed between the housing and the sub-carrier, the housing, and the A third sub-clutch installed between the sub-ring gears, a fourth sub-clutch installed between the sub-ring gear and the axle, a fifth sub-clutch installed between the sub-carrier and the axle, and the carrier A vehicle comprising a sixth sub-clutch installed between the sub-carriers, a seventh sub-clutch installed between the carrier and the sub-sun gear, and an eighth sub-clutch installed between the carrier and the axle. Stepless automatic transmission system.

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