KR19980030068A - Stepless Transmission for Vehicles - Google Patents

Abstract

The present invention includes a torque converter for converting torque by receiving power from an engine in order to realize the same as a continuously variable transmission for a vehicle having improved fuel economy and power performance by applying to four-wheel drive; Forward and backward control means connected to an input shaft directly connected to the turbine side of the torque converter to determine forward and backward directions of the vehicle and output rotational power; Shifting means arranged to continuously perform the shift by the rotational speed generated by varying the gear ratio by receiving the rotational power output from the forward and backward control means; It is to provide a continuously variable transmission for a vehicle comprising a transmission means for four-wheel drive by equally distributed to the front and rear wheels from the differential device received the rotational power output from the transmission means.

Description

Stepless Transmission for Vehicles

1 shows an embodiment according to the invention.

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

[Field of Invention]

The present invention relates to a continuously variable transmission for a vehicle, and more particularly, to a continuously variable transmission for a vehicle having improved fuel economy and power performance by being applied to a four-wheel drive.

[Private Technology]

In general, the transmission of the vehicle has a function of transmitting the driving force of the engine to the drive wheels, 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 window volume. These automatic transmissions are divided into a continuously variable transmission in which continuously continuous shifts are made without a specific speed change region between the respective shift stages.

The continuously variable transmission relates to a continuously variable transmission having great advantages in terms of fuel efficiency, power transmission performance, and weight, and the continuously variable transmission uses a diameter displacement of a pulley mounted on an input shaft and an output shaft.

However, the continuously variable transmission includes a driven pulley, a driving pulley, and a belt for transmitting power, which causes a problem in that durability in power transmission is poor.

[Summary of invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a continuously variable transmission for a vehicle, which is applied to a four-wheel drive to improve fuel efficiency and power performance.

The present invention for realizing the torque converter and the torque converter for receiving power from the engine; Forward and backward control means connected to an input shaft directly connected to the turbine side of the torque converter to determine forward and backward directions of the vehicle and output rotational power; Shifting means arranged to continuously perform the shift by the rotational speed generated by varying the gear ratio by receiving the rotational power output from the forward and backward control means; It characterized by a continuously variable transmission for a vehicle comprising a transmission means for four-wheel drive by equally distributed to the front and rear wheels from the differential device received the rotational power output from the transmission means.

The present invention provides a continuously variable transmission apparatus for a vehicle in which front and rear electric motors are installed such that the rotational power transmitted through the driven pulley of the transmission means is transmitted to the front and rear wheels through a differential device to achieve four wheel driving.

EXAMPLE

Hereinafter, with reference to the accompanying drawings an embodiment according to the present invention will be described in more detail.

1 is a view showing an embodiment according to the present invention, the drafting is a configuration diagram of the pulley diameter displacement generating means applied to the present invention, reference numeral 1 denotes a continuously variable transmission.

The continuously variable transmission 1 is composed of a torque converter 2, forward and reverse control means 4, and a shift means 6 and a transmission means 8.

The torque converter 2 of the continuously variable transmission 1 receives torque from the engine 10 to convert torque.

The torque converter 2 includes a pump impeller 12 which is directly connected to the crankshaft of the engine and rotates; It is disposed between the pump impeller 12 and the turbine runner 14 which rotates together by the oil ejected and ejected to change the flow of oil to include a stator 16 to increase the rotational force of the pump impeller 12 It is done by

Accordingly, when the engine rotates, oil filled in the torque converter 2 is ejected from the pump impeller 12 and supplied to the turbine runner 14 to drive the turbine runner 14 and then flow into the stator 16. .

In addition, the oil introduced into the stator 16 changes the direction thereof and repeats the flow of the oil into the pump impeller 12. In this case, the turbine runner 14 is shared by the turbine runner 14 by the rotation of the stator 16. There is a difference between the rotational force of (14) and the pump rotational force is to be the torque conversion.

The forward and backward control means 4 of the continuously variable transmission 1 is connected to the input shaft 18 to determine the forward and backward directions of the vehicle to output its rotational power.

The front and rear control means (4) is a double pinion planetary gear set is applied, the first and second pinion 20, 22 is connected to the first power transmission member 24, the planetary carrier 26 is installed The first friction member 28 is provided to act as an input element.

The ring gear 30 for installing the first and second pinions 20 and 22 at equal intervals on the inner circumference may serve as a reaction force element by connecting and connecting the second friction member 32 between the transmission housing 34. To be able.

In addition, the sun gear 36 installed at the center of the first and second pinions 20 and 22 is directly connected to the second power transmission member 38 and connected to the transmission means 6.

The first friction member 28 may use a conventional multi-plate clutch as a clutch means, and the second friction member 32 may use a conventional band brake as a brake means.

The transmission means 6 of the continuously variable transmission device 1 receives the rotational power output from the forward and backward control means 4 to continuously output the speed according to the rotation speed input by the belt 40 transmission.

The shifting means 6 is mounted on the first shaft 42, the drive pulley 44 is a variable outer diameter, and the driven pulley 46 by the belt 40 is connected to the drive pulley 44 It is made to be electric.

And the drive pulley 44 is connected to the driven pulley 46 and the belt 40 to transmit power, it is possible to perform a shifting action while the outer diameter thereof is variable, Figure 2 is an embodiment to enable it An example configuration is shown.

That is, the driving pulley 44 is composed of the fixed side pulley 48 and the variable side pulley 50, the fixed side pulley 48 is formed integrally with the first shaft 42, the variable side pulley 50 ) Is coupled to the ball spline 52 so as to move left and right on the first shaft 42.

A casing member 54 is provided on the side of the variable side pulley 50 to form a hydraulic chamber 56 therebetween, and the hydraulic chamber 56 is connected to the engine via a flow path 58 formed with a first shaft 42. The pressure fluid generated by the driving force of the gas can be supplied.

And the driven pulley 46 is composed of a fixed side pulley 60 and a variable side pulley 62 as described above, the ball spline so that the fixed side pulley 60 can move left and right on the second axis 64 Combined with 66.

The variable side pulley 62 is provided with a casing member 68 to form a hydraulic chamber 70, and the hydraulic chamber 70 has a driving force of the engine through a flow path 72 formed on the second shaft 64. The pressure fluid produced by the gas can be supplied.

In addition, the elastic member 74 is installed inside the variable side hydraulic chamber 70 so as to transmit power without slipping between the belt 40 and the driving and driven pulleys 44 and 46 so as to always prevent slippage.

Of course, the configuration of the drive and driven pulleys 44 and 46 is not limited to the above configuration and includes all that can be easily invented from the configuration.

The transmission means 8 of the continuously variable transmission 1 includes a differential device 78 connected to the second shaft 64 by an output gear 76 and transfers the power transmitted from the differential device 78. The front and rear electric motors 80 and 82 distribute equally to the rear wheels to output them to the wheels.

The continuously variable speed shift apparatus according to the embodiment of the present invention thus selects a selector lever not shown in the driving D range and controls the first friction member 28.

Then, the power of the input shaft 18 is transmitted to the first power transmission member 24 to be input to the first and second pinions 20 and 22 via the planetary carrier 26 so as to transfer the second power transmission member 38. Forward rotational power is output through.

In this way, when power is output from the forward and backward control means 4 to the transmission means 6, the output of the power shifted through the driven pulley 46 which rotates the drive pulley 44 and is thus transmitted to the belt 40. Let this be done.

At this time, the rotational speed change through the transmission means 6 increases or decreases according to the change in the outer diameter of the driving and driven pulleys 44 and 46, and the change condition thereof is that the outer diameters of the first driving pulley 44 and the driven pulley 46 are changed. The same may be considered when the outer diameter of the second drive pulley 44 is larger than the diameter of the driven pulley 46 and when the diameter of the third drive pulley 44 is smaller than the diameter of the driven pulley 46. .

If the outer diameters of the driving and driven pulleys 44 and 46 are the same under the first condition, the transmission ratio is 1: 1.

And secondly, when the outer diameter of the drive pulley 44 is larger than the diameter of the driven pulley 46, the speed is increased since the rotation speed of the 46 is greater than the rotation speed of the drive pulley 44, the third drive pulley 44 In the case where the outer diameter of N) is smaller than the diameter of the driven pulley 46, the rotation speed of the drive pulley 44 becomes smaller than the rotation speed of the driven pulley 46, thereby decelerating.

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

The change in the outer diameter of the drive pulley 44 and the driven pulley 46 is determined according to the hydraulic pressure supplied to the hydraulic chambers 56 and 70, and such hydraulic control is usually used in a continuously variable vehicle. Since it becomes possible to use the detailed description thereof will be omitted.

In addition, after the shift is made to the forward and backward control means 4 according to the rotation speed change of the sun gear 36 by the above-described action, the forward driving is performed by the differential device 78.

When the selector lever selects the reverse R range, the operation of the first friction member 28 is released and the operation of the second friction member 32 is performed, which is the first of the forward and reverse control means 4. 2, the pinion (20, 22) is the input element, the ring gear 30 acts as a reaction element, the power through the reverse rotation sun gear 36 is driven by the drive pulley 44 of the transmission means (6) Is powered on.

Then, the rotational power thereof is to be driven backward through the transmission means 6 and the transmission means 8.

In the case where the shift is made while the operation is performed as described above, even if the rotation speed of the sun gear 36 is not large, the shift is made large, and thus the change in the outer diameter of the driving and driven pulleys 44 and 46 can be reduced. .

This invention is an invention which can secure the inherent technology, such as improving fuel economy and improving vehicle performance, while extending the life of a belt by reducing the change of the outer diameter of a pulley and reducing the amount of belt movement.

In addition, the present invention improves the degree of freedom of design by improving the design, the two-axis axis can be implemented to achieve a compact transmission pursuit and a simple four-wheel drive, and the invention is to reduce the parts.

Claims (2)

A torque converter receiving torque from the engine and converting the torque; Forward and backward control means connected to an input shaft directly connected to the turbine side of the torque converter to determine forward and backward directions of the vehicle and output rotational power; Shifting means arranged to continuously perform the shift by the rotational speed generated by varying the gear ratio by receiving the rotational power output from the forward and backward control means; And a transmission means for equally distributing the front and rear wheels from the differential device receiving the rotational power output from the transmission means to make four-wheel drive. 2. The continuously variable transmission for a vehicle according to claim 1, wherein the front and rear electric gears are installed so that four-wheel drive is performed while the rotational power transmitted through the driven pulley of the transmission means is transmitted to the front and rear wheels through the differential device.