KR0154072B1 - Cvt for a vhicle - Google Patents

Abstract

The present invention provides a torsional damper for absorbing the torsional vibration of the output shaft according to torque fluctuations on the output shaft of the engine in order to realize this as a continuously variable transmission for a vehicle that provides a smooth starting and maximum output by installing a starting clutch on the driven shaft. ; Forward and backward control means connected to an input shaft directly connected to the torsional damper to determine forward and backward directions of the vehicle and output rotational power thereof; Shifting means for receiving the rotational power output from the forward and backward control means by belt transmission and performing stepless speed change according to the rotational speed input from both sides; It is to provide a continuously variable transmission for a vehicle comprising a longitudinal reduction means for interrupting the rotational power input from the transmission means at the time of starting to increase and decelerate.

Description

Car continuously variable transmission

1 is a block diagram of an embodiment according to the present invention.

2 is a block diagram of a pulley diameter displacement generating means applied to the present invention.

The present invention relates to a continuously variable transmission for a vehicle. More particularly, the present invention relates to a continuously variable transmission for a vehicle in which a starting clutch can be installed to obtain a maximum output at the start.

[Private Technology]

In general, the transmission of the vehicle has a function of transmitting the driving force of the engine to the driving wheel, which includes a manual transmission in which the driver directly selects a shift stage at the driver's will, and automatically shifts according to the driving conditions of the vehicle. It is roughly classified into an automatic transmission and a continuously variable transmission in which continuous shifting is performed in an infinite stage without a specific shift range between each shifting stage.

The continuously variable transmission relates to a continuously variable transmission having great advantages in terms of fuel economy, power transmission performance, and weight, and the continuously variable transmission utilizes a change in a contact radius with a belt according to a diameter displacement of a pulley mounted on an input weight and an output shaft. The method is mainly used.

However, the continuously variable transmission includes a driven pulley, a driving pulley, and a belt for transmitting power, which causes a problem of power shock.

[Summary of invention]

An object of the present invention is to provide a continuously variable transmission for a vehicle in which a starting clutch is installed on a driven shaft to achieve a smooth start and maximum power.

According to an aspect of the present invention, there is provided a torsional damper for absorbing torsional vibration of an output shaft according to a torque variation on an output shaft of an engine;

Forward and backward control means connected to an input shaft directly connected to a constant damper to determine forward and backward directions of the vehicle and output rotational power thereof;

Shifting means for receiving the rotational power output from the forward and backward control means by belt transmission and performing stepless speed change according to the rotational speed input from both sides;

It characterized by a continuously variable transmission for a vehicle comprising a longitudinal deceleration means for outputting after increasing and decelerating the rotational power input from the transmission means when starting.

EXAMPLE

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the present invention will be described in more detail.

1 is a configuration of an embodiment according to the present invention, Figure 2 is a configuration of the pulley diameter displacement generating means applied to the present invention, the rotational power from the engine 2 is output through the output shaft (4), At this time, on the output shaft (4) is equipped with a tonic damper (6) for absorbing the torsional vibration due to the torque conversion.

And the forward and reverse control means 10 disposed on the side of the torsion damper 6 and the input shaft 8 is applied to a set of double pinion planetary, the first and second pinion gear 12, 14 The planetary carrier 16 is directly connected to the input shaft 8, and the ring gear 18 may act as a reaction force element through the first friction member 20.

The first and second pinion gears 12 and 14, which are connected to the input shaft 8 and serve as input elements, are integrally formed with the transmission means 24 by the first power transmission member 22. Transmission is made to the transmission means 24 via the friction member 26.

At this time, the input shaft 8 is provided with a chain damper 6 and a sprocket 32 for driving the oil pump 28 between the tonic damper 6 and the planet carrier 16.

Further, a second interposed between the planetary carrier 16 and the first power transmission member 22 connected to the first and second pinions 112 and 14 engaged between the ring gear 18 and the sun gear 34. The friction member 26 is interrupted to control transmission to the transmission means 24.

The second friction member 20 may be a conventional multi-plate clutch as a clutch means, the second friction member 26 may be a conventional band brake as a brake means.

In addition, the shifting means 24 includes a drive pulley 36 in which a contact radius is changed by transmission of a second friction member 26 mounted on the first power transmission member 22, and the drive pulley 36. It comprises a driven pulley 40 for transmitting from the drive pulley 36 to the belt 38 to act as an input element through the contact radius is variable.

And the drive pulley 36 is connected to the driven pulley 40 and the belt 38 to transmit power, and the contact radius is variable to perform a shifting action, Figure 2 is to enable it The configuration of the embodiment is shown.

That is, the drive pulley 36 is composed of a fixed shaft pulley 42 and the variable side pulley 44, the fixed side pulley 42 is formed integrally with the first power transmission member 22, the variable side pulley 44 is coupled to the state which can be moved left and right by the ball spline 110 on this 1st power transmission member 22. As shown in FIG.

A casing member 46 is provided on the side of the variable side pulley 44 to form a hydraulic chamber 48 therebetween, and the hydraulic chamber 48 opens the flow path 50 formed with the first power transmission member 22. The pressure fluid generated by the driving force of the engine can be supplied through.

And the driven pulley 40 is composed of a fixed side pulley 52 and a variable side pulley 54 as described above, so that the fixed side pulley 52 can move left and right on the second power transmission member 56. Coupled by a ball spline 120, the variable side pulley (54) is provided with a casing member 58 to form a hydraulic chamber 60, the hydraulic chamber 60, the second power transmission member (56). The pressure fluid generated by the driving force of the engine can be supplied through the flow path 62 formed in the).

In addition, the elastic member 100 is interposed in the hydraulic chamber 60 of the variable pulley 54 of the driven pulley 40 in order to drive without slipping between the belt 38 and the driving and driven pulleys 36 and 40. To force the belt 38 at all times.

Of course, the configuration of the drive and driven pulleys 36 and 40 is not limited to the above configuration and includes all that can be easily invented from the configuration.

The output gear 64 connected to the second power transmission member 56 is installed on the drive shafts 70 and 72 while being engaged with the reduction gear 68 by the intermittent control of the starting clutch 66. A longitudinal reduction means 76 is connected to the known differential device 74.

The differential device 74 is a pair of side gears (78) and (80), which are disposed on the left and right sides of the case and are mounted to the drive shafts (70) and (72) at both ends, and the side gears (78) and (80) of the case. It consists of a pair of pinions 82 and 84 which are engaged between the front and rear sides.

The second power transmission member 56 provided with the output gear 64 is provided with a starting clutch 66 to output a power through the differential device 74 so that a smooth start is achieved.

The continuously variable transmission of the present invention thus configured controls the operation of the second friction member 26 when the driver selects a selector lever not shown in the driving D range.

Then, the power of the input shaft 26 is input through the first and second pinion gears 12 and 14, so that the double pinion planetary gear set is directly connected to the planetary carrier 16 and the second power transmission member 22. It will output the rotational power.

When power is output from the forward and backward control means 10 as described above, the input is made to the pull gear 64 through the driving pulley 24 and the driven pulley 40.

At this time, the rotational speed change input to the output gear 64 increases or decreases according to the change of the outer diameter of the driving and driven pulleys 36 and 40, and the change condition thereof is the outer diameter of the first driving pulley 36 and the driven pulley 40. When this is the same as the case where the outer diameter of the second drive pulley 36 is larger than the diameter of the driven pulley 40, and the diameter of the third drive pulley 40 is smaller than the diameter of the driven pulley 40 can be considered. have.

If the outer diameters of the driving and driven pulleys 36 and 40 are the same under the first condition, the transmission ratio is 1: 1.

And secondly, when the outer diameter of the drive pulley 36 is larger than the diameter of the driven pulley 40, the speed of the driven pulley 36 is increased because the number of rotation of the driven pulley 40 becomes larger, the third drive pulley When the outer diameter of 36 becomes smaller than the diameter of the driven pulley 40, the rotation speed of the drive pulley 36 becomes smaller than the rotation speed of the driven pulley 40, thereby decelerating.

In this way, the driving range is gradually shifted from the starting point to the high-speed driving without the division of the gear stage.

The change in the contact radius of the drive pulley 36 and the belt of the driven pulley 40 is determined by the hydraulic pressure supplied to the hydraulic chambers 48 and 60, and such hydraulic control is typically used in a continuously variable vehicle. The detailed description thereof will be omitted since it is possible to use a hydraulic control system.

In addition, after the shift is made by the forward and backward control means 10 according to the rotation speed of the sun gear 34 by the above-described action, the speed is reduced by the increase / deceleration means 76 and transmitted to the differential device 74, Forward driving will be made.

When the selector lever selects the reverse R range, the first friction member 20 is operated and the control of the second friction member 26 is released.

Accordingly, the first and second pinion gears 12 and 14 of the forward and reverse control means 10 become input elements, and the ring gear 18 does not act as a reaction force element, so that the sun gear 16 rotates when the planetary carrier 16 is rotated. Output to the transmission means 24 through the 34 to drive the drive pulley 36.

Then, the rotational power thereof is driven backward through the transmission means 24 and the longitudinal reduction means 76.

In addition, the power is driven through the driven pulley, the output is made through the differential clutch to achieve a smooth start of the vehicle, the simplification and cost reduction as well as the compactness of the invention can be pursued.

Claims (4)

A torsional damper for absorbing the torsional vibration of the output shaft according to the torque variation on the output shaft of the engine; Forward and backward control means connected to an input shaft directly connected to the torsional damper to determine forward and backward directions of the vehicle and output rotational power thereof; Shifting means for continuously changing the rotational power output from the forward and backward control means according to the rotational speed inputted by the belt vibration; And a vertical speed reduction means for outputting the speed after the speed reduction and the speed control so that a smooth start is made by the operation of the starting clutch when starting with the rotational power input from the speed change means. The first friction member according to claim 1, wherein the forward and reverse control means is applied with a double pinion planetary gear set so that the first and second pinion gears are directly connected to the input shaft as the planet carrier, and the ring gear can act as a reaction force element. And a first friction pin connected to the input shaft and acting as an input element, the second friction member including a second friction member connected to the first power transmission member to enable electric intermittent control with the transmission means. According to claim 1, wherein the transmission means is made up of a fixed and variable side pulley so that the contact radius is variable, the drive pulley disposed on the first power transmission member, and a fixed and variable side pulley so that the contact radius can be varied And a driven pulley disposed on a second shaft and connected to the driving pulley and a belt, the driven pulley installed on a second power transmission member. 4. The continuously variable transmission for a vehicle according to claim 3, wherein the starting clutch is installed on the second power transmission member to control the output gear and thereby smoothly transmit power through the reduction gear coupled thereto.