KR100276919B1 - Continuously variable transmission - Google Patents

Abstract

An object of the present invention is to provide a continuously variable transmission for a vehicle that simplifies a hydraulic control system and realizes power loss reduction and small size and light weight in an oil pump.

A continuously variable transmission for a vehicle according to the present invention includes a torque converter that receives torque from a power generator and converts torque thereto; The drive pulley mounted on the input shaft directly connected to the turbine side of the torque converter and the driven pulley connected to the drive pulley so as to be power-transmitted by the belt are driven mechanically by the tension adjusting means by the conversion of the diameter of the drive and the driven pulley. Shift control means for adjusting the tension of the belt and changing the speed of the driven pulley to a low speed shift specific pressure to convert the number of rotations generated by the power generator and transmitted through the torque converter; It is connected to this shift control means and one element of the planetary gear set, and receives the rotational power shifted therefrom to operate and deactivate the friction element by the hydraulic pressure supplied from the hydraulic control system to fix and connect other elements of the planetary gear set. Forward and reverse rotation control means configured to control the direction of rotation; And a longitudinal deceleration means connected to one element of the forward and reverse rotation control means to longitudinally decelerate the reverse rotational speed so as to be capable of power transmission to the rear, front, and four wheels, that is, the drive shaft on which the drive wheels are mounted. do.

Description

Continuously variable transmission

The present invention relates to a continuously variable transmission for a vehicle. More particularly, the belt pulley is controlled mechanically by controlling a drive pulley, and the driven pulley is controlled hydraulically to adjust a transmission ratio to simplify the hydraulic control system and power in an oil pump. The present invention relates to a continuously variable transmission for a vehicle using a continuously variable transmission that realizes a loss reduction and small size and light weight.

In general, a continuously variable transmission is used between a power generating device that generates power and a wheel that consumes rotational power generated by the power generating device so that the rotational power generated by the power generating device can be smoothly used on the wheel. do.

There are various methods of this continuously variable transmission, among which the driving pulley connected to the power generating device and the driven pulley connected to the wheel side are connected by belt, and the rotational power transmitted to the driving pulley by changing the diameter of these pulleys is driven. There is a pulley way to change the pulley.

Such a pulley type continuously variable transmission supplies a high pressure line pressure to a hydraulic chamber that changes the diameter of a driven pulley, and supplies a shift ratio pressure that reduces this line pressure by a hydraulic control system to a hydraulic chamber that changes the diameter of the driving pulley. Therefore, the drive pulley controls the speed ratio, and the driven pulley controls the maximum torque that can be transmitted so that belt slip does not occur.

However, the continuously variable transmission as described above supplies the high pressure line pressure generated from the oil pump to the driven pulley, and controls the line pressure and the speed ratio of the belt by controlling the line pressure to the transmission pulley to control the tension and speed ratio of the belt. The system is complicated, the power loss is large due to the oil pump driving, and there is a limit to the small size and light weight.

As a result, as described above, the continuously variable transmission for a vehicle using the continuously variable transmission has limitations in simplifying the hydraulic control system, reducing power loss in the oil pump, and miniaturization and weight reduction.

Therefore, the present invention has been invented to overcome the above limitations, and an object of the present invention is to provide a continuously variable transmission for a vehicle that simplifies a hydraulic control system and realizes power loss reduction and small size and light weight in an oil pump.

In order to realize this, the continuously variable transmission for a vehicle according to the present invention includes a torque converter for converting torque by receiving rotational power from a power generating device; The drive pulley mounted on the input shaft directly connected to the turbine side of the torque converter and the driven pulley connected to the drive pulley so as to be power-transmitted by the belt are driven mechanically by the tension adjusting means by the drive and the pulley by the diameter conversion of the driven pulley. Shift control means for adjusting the tension of the belt and changing the speed of the driven pulley to a low speed shift specific pressure to convert the number of revolutions generated by the power generator and transmitted through the torque converter; It is connected to this shift control means and one element of the planetary gear set, and receives the rotational power shifted therefrom to operate and deactivate the friction element by the hydraulic pressure supplied from the hydraulic control system to fix and connect other elements of the planetary gear set. Forward and reverse control means configured to control the direction of rotation; And a longitudinal deceleration means connected to one element of the forward and reverse rotation control means to longitudinally decelerate the reverse rotational speed so that the rear wheels, the front wheels, and the four wheels, that is, the drive shafts to which the drive wheels are mounted, are capable of power transmission.

The continuously variable transmission for a vehicle configured as described above mechanically controls the drive pulley of the shift control means to adjust the tension of the belt and the driven pulley to control the low speed shift specific pressure to adjust the speed ratio of the rotational power transmitted to the torque converter. By transmitting to the forward and reverse rotation control means, the rotational power in which the forward and reverse rotation is determined is transmitted to the driving wheel through the longitudinal reduction means to advance the vehicle forward and backward.

BEST MODE Hereinafter, preferred configurations and operations of the present invention will be described in detail with reference to the accompanying drawings.

1 is a first configuration diagram of a continuously variable transmission for a vehicle according to the present invention.

2 is a cross-sectional view of a continuously variable transmission means according to the present invention.

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a second configuration diagram of a continuously variable transmission for a vehicle according to the present invention.

5 is a third configuration diagram of a continuously variable transmission for a vehicle according to the present invention.

1 is a first configuration diagram of a continuously variable transmission for a vehicle according to the present invention, in which a torque control of a rotational power generated by an engine E, which is a power generating device, is converted into torque in a torque converter T to be connected to an input shaft 1. It is connected so that it can be transferred to the drive pulley 3 of the means.

The drive pulley (3) is connected to the driven pulley (7) by the belt (5) to change the rotational power transmitted to the input shaft (1) while changing the diameter of the planetary gear set (9) of the forward and reverse control means It is configured to deliver as one element.

That is, the driving pulley 3 is fixedly mounted to one side of the input shaft 1 directly connected to the turbine side of the torque converter T as described above, and the driven pulley 7 is connected to the driving pulley 3 so as to be capable of power transmission. And fixed to the planet carrier 11 of the planetary gear set 9 at the same time.

As shown in FIG. 2, the driving pulley 3 is disposed on the fixed sheave 13 directly connected to the input shaft 1 and on the opposite side thereof, and moves along the axial direction, together with the driving pulley 7. (3) A structure including a variable sheave 15 for varying its diameter is achieved.

As shown in Fig. 3, the variable sheave 15 is connected to the fixed sheave 13 via the driven member 17, the driving member 19, and the loading force transmission member 21, which are tension adjusting means. It is mounted so as to be movable in the axial direction, so as to control the tension of the belt 5 by controlling the movement of the variable sheave 15 in accordance with the torque change of the drive side transmitted from the input shaft 1 to the variable sheave 15. Formed.

The driven member 17 forms a protrusion on one side of the variable sheave 15 of the drive pulley 3 and forms a groove 23 therein, and the drive member 19 is provided on the opposite side of the variable sheave 15. Protruding portions are formed on the opposite side of the driven member 17 of the plate 25 which is integrally formed on the provided fixed sheave 13, and grooves 27 are formed thereon.

The groove 27 formed in the drive member 19 is formed on the opposite side of the groove 23 formed in the driven member 17.

The two grooves 23 and 27 are provided with a loading force L according to the torque T on the driving side through which the loading force transmission member 21 is interposed and transmitted to the driving member 19. It is formed with an inclined surface so as to be transmitted.

In addition, the loading force transmission member 21 may transfer the loading force L changed according to the torque T change between the driven member 17 and the driving member 19 to the variable shove 15. It is preferable that the cross section is formed in the shape of a rod.

The driven member 17, the driving member 19, and the rolling force transmission member 21 are preferably provided in plural in the circumferential direction between the plate 25 and the variable sheave 15.

On the other hand, the driven pulley 7 which is connected to the drive pulley 3 configured as described above so as to be power-transmitted by the belt 5 is a fixed sheave 29 directly connected to the planetary carrier 9 of the planetary gear set 9. ) And a variable sheave 31 which is arranged on the opposite side thereof and moves in the axial direction to vary the diameter thereof.

The hydraulic chamber 39 is provided on one side of the variable brake 31 by a cover 37 to act on the shift specific pressure generated by the oil pump 33 of the hydraulic control system and adjusted to the shift specific pressure in the regulator valve 35. To form. Therefore, this hydraulic chamber 39 is connected with the regulator valve 35 by the conduit 41.

The shift specific pressure supplied to the hydraulic chamber 39 through the pipe line 41 is supplied in a low pressure state in which the shift ratio between the driving pulley 3 and the driven pulley 7 can be controlled by operating the variable brake 31. .

Meanwhile, the planetary gear set 9 fixedly connected to the fixed sheave 29 and the planet carrier 11 of the driven pulley 7 determines the rotation direction of the shifted rotational power, but a single pinion planetary gear set may be used. In this configuration, it consists of a double pinion planetary gear set.

In addition, the planetary gear set 9 interposes the first friction member 47 between the ring gear 43 and the transmission housing 45 so as to provide a reaction force when reversing, and the premise of the planetary gear set 9 when moving forward. The second friction member 51 is interposed between the planetary carrier 11 and the sun gear 49 so as to be integrally driven.

The rotational power of the power generating apparatus shifted by the shift control means and the forward and reverse rotation control means is a propeller shaft for transmitting power to the rear wheels (not shown) through the longitudinal reduction gear 53 connected integrally with the sun gear 49. It is connected to transmit power to (55).

When the vehicle having the continuously variable transmission for a vehicle configured as described above is driven, the rotational power generated from the engine E is transmitted to the drive pulley 5 through the input shaft 1, and the driven pulley connected to the belt 5. It is transmitted to the planetary gear set 9 through (7).

At this time, the rotational power transmitted to the driving pulley 5 is shifted through the driven pulley 7 according to the mutual diameter change of the driving pulley 5 and the driven pulley 7 and transmitted to the planetary gear set 9.

That is, the load transmitted from the driving member 19 to the driven member 17 through the loading force transmission member 21 in the driving member 19 according to the size of the torque T transmitted to the fixed sheave 13 of the driving pulley 3. When the force (L) is controlled to control the amount of movement of the shake 15 to adjust the diameter of the drive pulley (3).

The low pressure hydraulic pressure generated by the oil pump 33 of the hydraulic control system is controlled by the shift specific pressure in the regulator valve 35 and supplied to the hydraulic chamber 39 through the conduit 41 to control the variable pulley of the driven pulley 7. The diameter of the driven pulley 7 is adjusted by moving the eve 31.

As described above, the rotational power shifted according to the diameter change of the driving and driven pulleys 3 and 7 is transmitted to the planetary carrier 11 of the planetary gear get 9, and when the first horse element 49 operates, the sun gear ( When the reverse rotational power is output to 49 and the second friction element 51 operates, the entire planetary gear set 9 is integrally holed to output the forward rotational power.

The forward and reverse rotational power is transmitted to the propeller shaft 55 through the longitudinal deceleration device 53 and then to the rear wheels to forward and reverse the vehicle.

On the other hand, Figure 4 is a second configuration of the continuously variable transmission for a vehicle according to the present invention, the first configuration and its overall configuration and operation is the same, so the detailed description thereof will be omitted.

That is, in the first configuration, the shift control means is immersed in the FR vehicle, and in the second configuration, there is only a difference illustrating the application in the FF vehicle.

In addition, since the first configuration is the rear wheel drive and the second configuration is the front wheel drive, there is only a slight difference in the power transmission system including the reduction device 53 in order to match the rotation direction of the engine E with the rotation direction of the driving wheel.

5 is a third configuration diagram of a continuously variable transmission for a vehicle according to the present invention, and the detailed description thereof will be omitted since the first configuration and its overall configuration and operation are the same.

That is, in the first configuration, the shift control means is applied to the FR vehicle, and in the third configuration, there is only a difference illustrating the application to the 4WD vehicle.

In addition, since the first configuration is the rear wheel drive and the third configuration is the four-wheel drive, there is only a slight difference in the power transmission system including the reduction device 53 in order to match the rotation direction of the engine E with the rotation direction of the driving wheel.

The continuously variable transmission for a vehicle configured as described above mechanically controls the driving pulley of the shift control means to adjust the tension of the belt and controls the driven pulley with a low speed shift specific pressure to adjust the shift ratio, thereby simplifying the hydraulic control system and oil pump. Can reduce power loss and reduce weight.

Claims (6)

(Correction) a torque converter receiving torque from the power generating device and changing torque; A driving pulley mounted on an input shaft directly connected to the turbine side of the torque converter and a driven pulley connected to the drive pulley so as to transmit power to the belt, wherein the driving pulley is protruded on one side of the variable sheave by converting a diameter of the driving and driven pulleys. And a protrusion formed on the driven member opposing side of the plate integrally formed with the fixed member provided on the opposing side of the variable sleeve and forming a groove thereon and opposing the groove formed on the driven member. Tension including a driving member having a groove formed therein, and a loading force transmission member formed to be able to transfer a loading force corresponding to the torque of the driving side transmitted to the driving member to the driven member and interposed in the grooves formed in these two members. The tension of the belt is mechanically adjusted by the adjusting means, and the driven pulley adjusts the speed ratio to a low pressure gear ratio. Shift control means is generated in the power generating unit converts the number of revolutions transmitted through the torque converter and; It is connected to the shift control means and one element of the planetary gear set, and receives the external power shifted therefrom to operate and deactivate the friction element by the hydraulic pressure supplied from the hydraulic control system to fix and connect the other elements of the planetary gear set. Forward and reverse control means configured to control the rotational direction of the rotation; And a vertical reduction means connected to one element of the forward and reverse rotation control means to vertically decelerate the normal and reverse rotation speeds so as to transmit power to a drive shaft on which the drive wheels are mounted. 2. The continuously variable transmission for a vehicle according to claim 1, wherein the grooves formed in the driven member and the driving member are formed to be inclined to each other so as to transfer the loading force according to the torque transmitted from the driving member to the driven member by the loading force transmitting member. . The continuously variable transmission for a vehicle according to claim 1, wherein the loading force transmission member is formed in a circular rod state so that the loading force changed according to the torque change between the driven member and the driving member can be transferred to the variable shive. The continuously variable transmission for a vehicle according to claim 1, wherein the longitudinal reduction means is connected to transmit power to the rear wheels of the FR vehicle. The continuously variable transmission for vehicle according to claim 1, wherein the longitudinal reduction means is connected to transmit power to the front wheel of the FF vehicle. The continuously variable transmission for a vehicle according to claim 1, wherein the longitudinal reduction means is connected to transmit power together to the front and rear wheels of the 4WD vehicle.