KR100255050B1 - Cvt - Google Patents

Abstract

PURPOSE: A continuously variable transmission is provided to enhance durability and to reduce a cost by continuously shifting using a stepless frictional gear and a differential gear. CONSTITUTION: A transmission contains a torque converter(3) as a power train transmitting rotational force from an input shaft to an output shaft; a continuous torque converting device converts power from the torque converter to rotational force; and a rotation converting device driving vehicle wheels with frictional factors driven by the rotational force from the continuous torque converting device. The torque converter consists of a pump impeller(5), a turbine runner(7) and a stator(9). The continuous torque converting device consists of a driving pulley(11), a driven pulley(13) and a steel belt(15). The rotation converting device consists of two pairs of bevel gears(17,19,21,23) engaged with each other. Herein, one bevel gear(17) interlocks with the shaft of the continuous torque converting device and the other bevel gear(19) interlocks with a driving gear(27). The other pair of bevel gears(21,23) are supported by a supporting shaft(25) and independently rotated from the supporting shaft.

Description

Continuously variable transmission

The present invention relates to a continuously variable transmission, and more particularly, by using a continuously variable friction friction using a belt and a differential gear to enable continuous shifting as a simple structure, thereby improving durability and reducing product cost. It relates to a continuously variable transmission that allows.

The transmission of the vehicle has a function of changing the driving force of the engine and transmitting it to the driving wheels. The transmission includes a manual transmission that directly selects a shift stage at the driver's will, and automatically shifts according to driving conditions of the vehicle. A transmission device is roughly classified into a continuously variable transmission in which stepless shifting is performed without a specific shifting area between each shifting step.

For example, the continuously variable transmission device compensates for the disadvantage that an automatic transmission generates a shift shock according to a change in the shift stage, and has advantages in fuel efficiency, power performance, and weight, and a pulley connected to a belt by an input shaft and an output shaft. It is mainly used to install them in each and to relatively convert the outer diameter of this pulley.

And the conventional continuously variable transmission is provided with a planetary gear for the function of forward rotation or reverse rotation, according to each of the elements in the planetary gear to determine the input, reaction force and output elements can form a variety of transmission forms.

However, since the conventional continuously variable transmission uses a planetary gear to implement forward and reverse rotation, the transmission is complicated in structure and thus, durability is reduced and product cost is increased.

Therefore, the present invention is to solve this problem of the prior art, an object of the present invention by using a continuously variable friction differential and a differential gear using a belt to enable a continuous shift as a simple structure, to improve the durability, It is to provide a continuously variable transmission that can reduce the cost of the product.

In order to achieve the above object, the present invention provides a power transmission means for smoothing the rotational force output from the engine and transmitting and non-transmitting the rotational force from the input shaft to the output shaft; Stepless torque conversion means for varying the torque ratio, endless torque conversion means consisting of a rotation switching means that is provided at a predetermined position a friction element that is operated as necessary to implement the forward rotation or reverse rotation by receiving the rotation force output from the endless torque conversion means Provide a transmission.

1 is a schematic diagram showing an example of a continuously variable transmission according to the present invention.

2 is a schematic view showing another example of a continuously variable transmission according to the present invention.

3 is a schematic view showing still another example of the continuously variable transmission apparatus according to the present invention.

<Explanation of symbols for main parts of drawing>

1: engine 3: torque converter

5, 31: pump impeller 7,33: turbine runner

9: stator 11: driving pulley

13: driven pulley 15: steel belt

17, 19, 21, 23: bevel gear 25: support shaft

27: drive gear 29: fluid clutch

35: flywheel C1, C2: clutch

B1: brake

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a continuously variable transmission of an embodiment, which continuously transmits the rotational force of the engine 1 to a wheel (not shown).

The continuously variable transmission uses a torque converter 3 as a power transmission means for smoothing the rotational force output from the engine 1 and transmitting and non-transmitting the rotational force from the input shaft to the output shaft. ) By the operation of the friction element of the rotation switching means for converting the rotational force to the stepless torque conversion means to drive the wheel in the forward or reverse rotation.

The torque converter 1 changes the direction of motion of the fluid in the sealed case and repeatedly returns to increase the rotational force of the input shaft and transmit it to the output shaft.

The torque converter 3 converts the torque generated from the engine 1, so that the pump impeller 5 rotates in direct connection with the shaft from the engine 1, so as to face the pump impeller 5. An oil disposed between the turbine runner 7 and the pump impeller 5 and the turbine runner 7 which are rotated together by the disposed and flowing oil to convert the flow of oil to retain momentum in the pump impeller 5. In the stator 9 or the like for returning.

When the engine 1 rotates, the torque converter 3 drives the turbine runner 7 while the oil filled therein is ejected from the pump impeller 5 and supplied to the turbine runner 7, and then the stator 9. Inflow.

In addition, the above-described action of flowing into the stator 9 is repeated. At this time, since the stator 9 switches the direction of movement of the flowing fluid, the stator 9 is introduced into the pump impeller 5 again, and thus the oil moves back to the moving oil. The momentum is added to the turbine runner 7 again, and the oil is rotated again to run the turbine runner 7, so that the rotational force of the turbine runner 7 is increased.

The endless torque converting means is driven by the power from the above-described power transmission means, that is, the torque converter 3, and the driving pulley 11 whose width is varied as necessary, and the rotational force from the driving pulley 11 is changed. Driven pulley 13, the width of which is varied in accordance with need, and the drive pulley 11 and driven pulley 13 are arranged to connect the rotational force of the drive pulley 11 driven pulley 13 It consists of a steel belt 15 to be transmitted to.

The pulleys 11 and 13 are formed so that one side rotates together with the shaft and the other side is movable by hydraulic pressure in the axial direction on the shaft, and the rotation radius of the steel belt 15 is variable in width. Let's go.

Such endless torque converting means varies the torque ratio by changing the radius of the drive pulley 11 and by changing the radius of the driven pulley 13 in synchronization.

In addition, the rotation switching means is a friction element that is operated as necessary to implement a forward rotation or a reverse rotation by receiving the rotation force output from the endless torque conversion means is installed in a predetermined position, and has a shape such as a differential gear Doing.

The rotation switching means is provided with two pairs of bevel gears 17, 19, 21 and 23 facing each other, so that the pair of bevel gears 17 and 19 mesh with the other pair of bevel gears 21 and 23, one pair One bevel gear 17 of the bevel gears 17 and 19 of the bevel gear 17 and 19 is connected to the shaft from the endless torque converting means and the other bevel gear 19 is linked to the drive gear to drive the vehicle, The bevel gears 21 and 23 are supported by the support shaft 25 and rotated independently of the support shaft 25.

And the rotation switching means is provided with a clutch (C1) between the support shaft 25 and the shaft from the endless torque converting means, a brake (B1) for fixing the support shaft (C1) as necessary It involves doing.

Neutral, driving, and reversing of the apparatus of the embodiment thus made will be described.

In neutral, the clutch C1 and the brake B1 are not operated.

Then, when the driving shaft is stopped, the load is applied to the bevel gear 19, and thus the bevel gears 21 and 23 rotate around the bevel gear 19, and the torque converter 3 idles.

That's why it stays stationary.

At the time of driving, the clutch C1 is operated and the brake B1 is deactivated.

Then, a rotational force is generated in the torque converter 3 to rotate the driving pulley 11, which causes the driven pulley 13 to rotate by the steel belt 15, and the bevel gears 17, 19, 21, and 23 are rotated. Rotate integrally.

Thus, the drive gear 27 is rotated and transmitted to the wheel.

In this case, when the speed of the vehicle is to be changed to change the rotational force, the width of the driving pulley 11 and the width of the driven pulley 13 are also reduced, and the vehicle is driven at a low speed. The width of) and at the same time widen the width of the driven pulley 13 will drive the vehicle at high speed.

At the time of reversing, the brake B1 is operated and the clutch C1 is deactivated.

Then, since the bevel gears 21 and 23 rotate idle on the support shaft 25, the rotational force transmitted from the driven pulley 13 rotates the bevel gear 17, and the bevel gear 17 is beveled. The gears 21 and 23 are rotated, and the bevel gears 21 and 23 rotate the bevel gear 19 so that the drive gear 27 is reversed.

2 shows a continuously variable transmission of another embodiment, which continuously transmits the rotational force of the engine 1 to a wheel (not shown).

The apparatus of the present embodiment has the same structure as the above endless torque converting means and the rotary telephone means, but the power transmission means uses a fluid clutch 29 which transmits or transmits the rotational force by the fluid.

The fluid clutch 29 is composed of a pump impeller 31 for flowing a fluid to be filled and a turbine runner 33 rotated by a fluid flowing out of the turbine impeller 31. The turbine runner 33 rotates together by rotation.

In addition, since the said endless torque conversion means and the rotary telephone means are the same as an Example, it abbreviate | omits description.

Neutral, driving, and reversing of the apparatus of the present embodiment thus made will be described.

In neutral, the clutch C1 and the brake B1 are deactivated.

Then, when the drive shaft is stopped, the load is applied to the bevel gear 19, and thus the bevel gears 21 and 23 rotate around the bevel gear 19, and the fluid clutch 29 idles.

That's why it stays stationary.

At the time of driving, the clutch C1 is operated and the brake B1 is deactivated.

Then, a rotational force is generated in the torque converter 3 to rotate the driving pulley 11, which causes the driven pulley 13 to rotate by the steel belt 15, and the bevel gears 17, 19, 21, and 23 are rotated. Rotate integrally.

Thus, the drive gear 27 is rotated and transmitted to the wheel.

In this case, when the speed of the vehicle is to be changed to change the rotational force, the width of the driving pulley 11 and the width of the driven pulley 13 are also reduced, and the vehicle is driven at a low speed. The width of) and at the same time widen the width of the driven pulley 13 will drive the vehicle at high speed.

At the time of reversing, the brake B1 is operated and the clutch C1 is deactivated.

Then, since the bevel gears 21 and 23 rotate idle on the support shaft 25, the rotational force transmitted from the driven pulley 13 rotates the bevel gear 17, and the bevel gear 17 is beveled. The gears 21 and 23 are rotated, and the bevel gears 21 and 23 rotate the bevel gear 19 so that the drive gear 27 is reversed.

3 shows a continuously variable transmission of another embodiment, which continuously transmits the rotational force of the engine 1 to a wheel (not shown).

The apparatus of the present embodiment is the same as the stepless torque converting means and the rotary telephone means described above, but the power transmission means uses the start clutch C2 and the flywheel 35 which smoothly and interrupt the rotational force of the engine 1 described above. It is a structure.

Since the endless torque converting means and the rotary telephone means are the same as in the embodiment, description thereof is omitted.

The flywheel 35 is connected to the output shaft from the engine 1 to facilitate rotation by inertia rotation, and the start clutch C2 is provided between the flywheel 35 and the endless torque converting means. It is installed to transmit or transmit the rotational force of the flywheel 35 to the endless torque converting means.

Neutral, driving, and reversing of the apparatus of the present embodiment thus made will be described.

In neutral, the clutch C1, the brake B1, the start clutch C2 are deactivated.

Then, the driving force of the engine 1 only rotates the flywheel 35 described above, and power is not transmitted from the start clutch C2.

That's why it stays stationary.

At the time of driving, the clutch C1 and the start clutch C2 are operated, and the brake B1 is deactivated.

Then, a rotational force is generated in the torque converter 3 to rotate the driving pulley 11, which causes the driven pulley 13 to rotate by the steel belt 15, and the bevel gears 17, 19, 21, and 23 are rotated. Rotate integrally.

Thus, the drive gear 27 is rotated and transmitted to the wheel.

In this case, when the speed of the vehicle is to be changed to change the rotational force, the width of the driving pulley 11 and the width of the driven pulley 13 are also reduced, and the vehicle is driven at a low speed. The width of) and at the same time widen the width of the driven pulley 13 will drive the vehicle at high speed.

At the time of reversing, the brake B1 and the start clutch C2 are operated, and the clutch C1 is deactivated.

Then, since the bevel gears 21 and 23 rotate idle on the support shaft 25, the rotational force transmitted from the driven pulley 13 rotates the bevel gear 17, and the bevel gear 17 is beveled. The gears 21 and 23 are rotated, and the bevel gears 21 and 23 rotate the bevel gear 19 so that the drive gear 27 is reversed.

As described above, since the apparatus of the present invention can easily and continuously change the rotational force of the engine with a simple structure, the durability can be improved and the product price can be reduced.

It is apparent to those skilled in the art that the present invention is not limited to the described embodiments, and that various modifications and changes can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the claims of the present invention.

Claims (6)

Power transmission means for smoothing the torque output from the engine and transmitting and non-transmitting the torque from the input shaft to the output shaft, Stepless torque converting means for receiving power from the power transmission means and rotating the steplessly changing torque ratio, A continuously variable transmission comprising a rotation switching means in which a friction element that is actuated as necessary is implemented at a predetermined position in order to receive the rotational force output from the continuously variable torque converting means and implement forward or reverse rotation. The continuously variable transmission as claimed in claim 1, wherein the power transmission means is a torque converter which increases the rotational force of the input shaft and transmits it to the output shaft by continuously changing the direction of movement of the fluid in the sealed case. The method of claim 1, wherein the power transmission means is a fluid clutch consisting of a structure in which a wing is installed inside the case to be sealed and the other wing is rotated by the rotation of one wing by embedding the fluid in the case. Continuously variable transmission. According to claim 1, wherein the power transmission means is a fly wheel for smooth rotation from the engine by the inertial force, And a clutch for intermittently regulating the rotational force output from the flywheel. The drive pulley according to any one of claims 1 to 4, wherein the stepless torque conversion means is rotated with power from the power transmission means and the width of the drive variable is varied as necessary. A driven pulley whose rotational force from the drive pulley is changed and outputted, the width of which is varied as necessary, And a steel belt disposed by connecting between the drive pulley and the driven pulley to transfer the rotational force of the drive pulley to the driven pulley. The said rotation switching means is a shape similar to the differential gear as described in any one of Claims 1-4. Two pairs of bevel gears are installed facing each other so that a pair of bevel gears mesh with another pair of bevel gears, One bevel gear of the pair of bevel gears is connected to interlock with the shaft from the endless torque converting means described above and the other bevel gear to interlock with the drive gear driving the vehicle, The other pair of bevel gears are supported by the support shaft and rotated independently of the support shaft, A clutch is provided between the support shaft and the shaft from the endless torque converting means, A continuously variable transmission comprising providing a brake for fixing this support shaft as necessary.