KR0154078B1 - Cvt for a rear driving vehicle - Google Patents

Abstract

In order to reduce the shift shock and improve the ride comfort by making a gradual start at the start of the vehicle, a toe damper is installed on the output shaft of the engine and absorbs the torsional vibration of the output shaft according to the torque fluctuation; Front and reverse control means for outputting rotational power by determining the forward and backward direction of the vehicle consisting of a planetary gear set having a ring gear as an input element connected to the first power transmission member connected to the output shaft, and the forward and reverse control means Transmission means for transmitting the rotational power output from the belt transmission to the third power transmission member by transmitting to the third power transmission member, and power installed in one end of the third power transmission member connected to the transmission means and transmitted by the transmission means A start control means for cracking down and a bell mounted on the rear wheel for the power transmitted through the start control means; Able to send in a gear set and provides a rear-wheel-drive continuously variable transmission for a flange installed.

Description

Stepless transmission for rear wheel drive

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

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuously variable transmission for rear wheel drive, and more particularly, to a continuously variable transmission for rear wheel drive, which reduces shift speed and speeds up ride by allowing the vehicle to start gradually.

In general, the transmission of the vehicle has a function of transmitting the driving force of the engine to the driving 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 vehicle. 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.

In the above-described transmission device, the present invention relates to a continuously variable transmission having great advantages in terms of fuel economy, power transmission performance, and weight by supplementing the disadvantages of the automatic transmission using hydraulic pressure, and the continuously variable transmission thereof has an input shaft. The method using the contact radius displacement of the pulley and the belt mounted on the output shaft is mainly used.

Such a continuously variable transmission includes a problem in that a shift shock occurs at the start of a vehicle, thereby inhibiting the riding comfort.

The present invention has been made to solve the conventional technical problems as described above, an object of the present invention is to continuously drive at the start of the vehicle to reduce the shift shock to improve the riding comfort stepless continuously variable speed device To provide.

In order to realize the object of the present invention, a torsional damper is installed on the output shaft of the engine and absorbs the torsional vibration of the output shaft in accordance with the torque variation,

A forward and backward control means connected to the output shaft first power transmission member connected to the torsional damper and consisting of a planetary gear set having a ring gear as an input element to determine forward and backward directions of the vehicle and output rotational power;

A transmission means for continuously performing transmission by transmitting the rotational power output from the forward and backward control means by belt transmission to a third power transmission member;

A start control means installed at one end of the third power transmission member connected to the speed change means to control the power transmitted by the speed change means;

Provided is a continuously variable transmission for rear wheel drive provided with a flange to send the power transmitted through the start control means to the longitudinal reduction gear device installed in the rear wheel.

With reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail.

1 is a configuration diagram of a continuously variable transmission according to an embodiment of the present invention, in which rotational power is transmitted from an engine 2 to an output shaft 4, in which a torsional vibration due to torque conversion is absorbed on the output shaft 4. The torsional damper 6 is mounted.

The forward and reverse control means 8 connected to the output shaft 4 connecting the torsional damper 6 is composed of a single pinion planetary gear set.

The first power transmission member 10 and the ring gear 12 connected to the output shaft 4 are always connected as an input element, and the sun gear 14 is connected to the second power transmission member 16 to always output It acts as an element, the planet carrier 18 is connected to the second power transmission member 16 is made of a structure that acts as an output element selectively interposed the first friction element 20.

And the planet carrier 18 is interposed between the transmission housing 22, the second friction element 24, and by the operation of the second friction element 24 to selectively act as a reaction force element.

In the above, the first friction member 20 may use a conventional multi-plate clutch as a clutch means, and the second friction element 24 may use a conventional band brake as a brake means.

And the transmission means 25 is mounted to the second power transmission member 16 connected to the sun gear 14 and the drive pulley 26 is variable in the contact radius with the belt 36, and the drive pulley 26 And a driven pulley 28 which is electrically driven by the belt 36 and installed on the third power transmission member 32.

The driven pulley 28 has a structure in which the contact radius with the belt 36 is variable like the driving pulley 26, and its central axis is output by the third power transmission member 32.

In addition, the driving pulley 26 is connected to the driven pulley 28 and the belt 30 to transmit power, and the contact radius is variable to perform a shifting operation. An example configuration is shown.

That is, the drive pulley 26 is composed of a fixed side pulley 34 and a variable side pulley 36, the fixed side pulley 34 is formed integrally with the second power transmission member 16, the variable side pulley 36 is coupled to the ball spline 37 so as to be able to move on the second power transmission member 16 in the axial direction.

A casing member 38 is provided on the side of the variable side pulley 36 to form a hydraulic chamber 40 therebetween, and the hydraulic chamber 40 has a flow path 42 formed in the second power transmission member 16. Through the pressure fluid generated by the driving force of the engine can be supplied.

And the driven pulley 28 is composed of a fixed side pulley 44 and a variable side pulley 46 as described above, the fixed side pulley 44 is formed integrally with the third power transmission member (32).

In addition, the variable side pulley 46 is coupled by the ball spline 47 which can move left and right on the third power transmission member 32, the casing member 48 is interposed therein the variable side pulley 46 A hydraulic chamber 50 is formed, and the hydraulic chamber 50 is capable of supplying a pressure fluid generated by the driving force of the engine through a flow path 52 formed in the second power transmission member 32.

In addition, slip is prevented by interposing an elastic member 51 in the hydraulic chamber 50 to ensure power transmission between the driving and driven pulleys 26 and 28 and the belt 30.

Of course, the configuration of the drive and driven pulleys 26 and 28 is not limited to the above configuration, and includes all that can be easily invented from the configuration.

The start control means 56 is interposed between the third power transmission member 32 and the fourth power transmission member 58 of the driven pulley 28.

The start control means 56 consists of a multi-plate clutch which is a clutch means.

The multi-plate clutch to be used as the start control means 56 described above is the same configuration and operation as that known in the art, which is not necessarily only the multi-plate clutch can be used, it can be used in various ways.

At the end of the fourth power transmission member 58 to which the start control means 56 is connected, a flange 61 for driving the rear wheels is installed to transfer power to the rear wheels.

In the continuously variable transmission of the present invention, when the driver selects the selector lever as the driving D range, the first friction element 20 is operated.

Then, after the first friction element 20 is operated, the start control means 56 is operated.

The start control means 56 is to allow a smooth start by transmitting power of the engine to the driving wheel gradually at the start of the vehicle.

Then, the power of the output shaft 4 is input through the ring gear 12, and the output is made through the planet carrier 18 and the sun gear 14, so that the planet carrier 18 and the sun gear 14 are locked and fixed. It will output rotation.

As such, when power is output from the forward and reverse rotation control means 8, the rotational power is input through the driving pulley 26, and the rotational power is transmitted to the driven pulley 28 through the belt 30.

The rotational power of the planetary carrier 18 and the sun gear 14 is increased and decreased in the abduction speed through the change in the outer diameter of the driving and driven pulleys 26 and 28. The conversion condition is, first, the driving pulley 26. ) And when the outer diameter of the driven pulley 28 is the same, the outer diameter of the second driving pulley 26 is larger than the diameter of the driven pulley 28, and the diameter of the third driving pulley 26 is the driven pulley 28. It can be divided into cases smaller than the diameter of.

In the first condition, when the outer diameters of the driving and driven 26 and 28 are the same, the transmission ratio is 1: 1.

And secondly, when the outer diameter of the drive pulley 26 is larger than the diameter of the driven pulley 28, the rotation speed of the driven pulley 28 is larger than the rotation speed of the drive pulley 26, so that the speed is increased. When the outer diameter of (26) becomes smaller than the diameter of the driven pulley 28, since the rotation speed of the drive pulley 26 becomes smaller than the rotation speed of the driven pulley 28, deceleration is made.

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

The change in the contact radius between the drive pulley 26 and the driven pulley 28 and the belt is determined by the hydraulic pressure supplied to the hydraulic chambers 40 and 50, and such hydraulic control is typically used in a continuously variable vehicle. Since it becomes possible to use the hydraulic control system, the detailed description is abbreviate | omitted.

After the shift is made through the shift means 25 as described above, forward driving is performed by transmitting power to the rear wheel through the start control means 56.

And when the selector lever is selected as the reverse R range, the operation of the first friction element 20 is released, the operation of the second friction element 24 is made, which is the ring of the forward and reverse rotation control means 14 The gear 12 is an input element, and the planet carrier 18 acts as a reaction force element, so that the reverse rotation output is made through the sun gear 20.

Then, its rotational power is to enable the reverse travel through the transmission means (24).

In the continuously variable drive for rear wheel drive of the present invention, by gradually starting the vehicle can reduce the shift shock can improve the riding comfort.

Claims (5)

It is a planetary gear set installed on the output shaft of the engine and connected to the torsional damper that absorbs the torsional vibration of the output shaft according to the torque change, and to the output shaft first power transmission member connected to the torsional damper. And forward and backward control means for determining the forward and backward directions of the vehicle and outputting the rotational power, and transmitting the rotational power output from the forward and backward control means by belt transmission to the third power transmission member. A shift control means installed at one end of the third power transmission member connected to the shift means and configured to control the power transmitted by the shift means, and a bell provided at the rear wheel for the power transmitted through the start control means. Continuously variable transmission for rear wheels with flanges for supplemental reduction gear units. The method of claim 1, wherein the forward and reverse control means is formed of a single pinion planetary gear set, the ring gear is connected to the first power transmission member connected to the output shaft of the engine to act as an input element at all times, the pinion carrier is a sun gear Optionally acts as an output element via a second power transmission member and a shaft via a first friction element, and the ship always acts as an output element, and a ring is provided between a ring gear and a transmission housing through a second friction element. A continuously variable transmission for rear wheels characterized in that the gears selectively act as reaction elements. 3. The continuously variable transmission for driving rear wheel according to claim 2, wherein the first friction element is made of a multi-plate clutch, and the second friction element is made of a band brake. The drive pulley according to claim 1, wherein the transmission means is mounted to a second power transmission member connected to the output shaft of the engine and is arranged in parallel with the drive pulley, the drive pulley having a variable contact radius with the belt, and the contact radius with the belt. A continuously variable transmission for rear wheels including a driven pulley for driving the variable third power transmission member. 2. The continuously variable transmission for rear wheel driving according to claim 1, wherein the start control means is installed on a third power transmission member connected to the driven pulley of the speed shift means and comprises a multi-plate clutch.