KR19980017026A - Stepless Transmission for Vehicles - Google Patents

Abstract

By the simple configuration, the longitudinal rear wheel drive can be carried out, the width of the continuously variable speed range can be increased, the power of the engine can be effectively utilized, the power performance is improved, and the load shared by the belt is divided to share the load. To provide a continuously variable transmission for a vehicle that can improve the durability; An oscillation means for transmitting the rotational power output from the engine to the first shaft; A double pinion planetary gear set, comprising: forward and backward control means disposed on the first axis to control forward and backward of a vehicle; A first continuously variable means disposed between the rear end of the first shaft and a second shaft disposed at a predetermined interval below the first shaft to continuously transmit the rotating power transmitted from the first shaft to the second shaft; and; A second shaft disposed between the second shaft and a third shaft arranged in the same line on the rear side of the first shaft to shift the continuously variable rotational power by the first continuously variable transmission means to transmit the second shaft to the third shaft; Stepless transmission means; It provides a continuously variable transmission for a vehicle comprising a.

Description

Stepless Transmission for Vehicles

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

2 is a block diagram showing an embodiment of a continuously variable transmission means applied to the present invention.

3 is a block diagram of a second embodiment according to the present invention.

4 is a configuration diagram of a third embodiment according to the present invention.

5 is a configuration diagram of a fourth embodiment according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuously variable transmission for a vehicle, and more particularly, to a continuously variable transmission for a vehicle that can be easily applied to a longitudinal rear wheel drive vehicle by reducing the manufacturing cost by simplifying the configuration.

The transmission of the vehicle has a function of transmitting the driving force of the engine to the driving wheels. The transmission includes a manual transmission that directly selects a shift stage at the driver's will, and an automatic transmission in which a shift is automatically made according to driving conditions of the vehicle. The apparatus is roughly classified into a continuously variable transmission in which stepless continuous shifting is performed without a specific shift range between each gear stage.

In the transmission as described above, 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.

However, in the conventional continuously variable transmission, a continuously variable transmission means using a pulley having a belt and a variable diameter is usually used, and by using one continuously variable transmission means, the continuously variable transmission area is largely limited, thereby effectively using the power of the engine. The problem is that it can't

In addition, the load of all the rotational power is transmitted by one belt, thereby shortening the life of the belt according to this, and implies a problem that the durability can not be greatly expected.

Therefore, the present invention has been invented to solve the above problems, the object of the present invention is to simplify the configuration and to increase the width of the continuously variable speed range to effectively use the power of the engine, longitudinal rear wheel drive The present invention provides a continuously variable transmission for a vehicle that can be easily applied to a vehicle.

In addition, by effectively using the power of the engine, it is to provide a continuously variable transmission for a vehicle that can improve the power performance, by dividing the load shared by the belt to share, thereby improving durability.

In order to realize this, the present invention includes an oscillating means for transmitting the rotational power output from the engine to the first shaft; A double pinion planetary gear set, comprising: forward and backward control means disposed on the first axis to control forward and backward of a vehicle; A first continuously variable means disposed between the rear end of the first shaft and a second shaft disposed at a predetermined interval below the first shaft to continuously transmit the rotating power transmitted from the first shaft to the second shaft; and; A second shaft disposed between the second shaft and a third shaft arranged in the same line on the rear side of the first shaft to shift the continuously-rotated rotational power by the first continuously variable transmission means to transfer the third shaft to the third shaft; Stepless transmission means; It is characterized by providing a continuously variable transmission for a vehicle comprising a.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described in detail.

1 is a configuration diagram of a first embodiment according to the present invention, which shows an example in which the torque converter 4 is applied as the oscillation means 2.

The torque converter 4 includes a pump impeller 8 which rotates in direct connection with the crankshaft of the engine 6; A turbine runner 10 which is disposed to face the pump impeller 8 and rotates together by oil ejected; And a stator 12 disposed between the pump impeller 8 and the turbine runner 10 to change the flow of oil to increase the rotational force of the pump impeller 8.

Accordingly, when the engine rotates, the oil filled in the torque converter 4 is ejected from the pump impeller 8 and supplied to the turbine runner 10 to drive the turbine runner 10 and then flow into the stator 12. .

In addition, the oil introduced into the stator 12 changes the direction and repeats the flow of the oil into the pump impeller 8, in which the turbine runner shared by the stator 12 is rotated by the rotation of the stator 12. There is a difference between the rotational force of 10) and the rotational force of the pump, which is the torque conversion.

The rotational power output through the oscillation means 2 controls forward and backward of the vehicle according to the driver's will by the forward and backward control means 18 disposed on the first shaft 16.

The forward and reverse control means 18 is a double pinion planetary gear set, the sun gear 22 is formed integrally with the output side of the torque converter 4, the planet carrier 24 is the output side of the torque converter 4 And the first friction member 26 are connected to each other, and the opposite side thereof is connected to the first side 16.

In addition, the ring gear 28 is connected via the transmission housing 30 and the second friction member 32 to operate the first friction member 26 to directly connect the planetary gear set to the first shaft 16. To drive forward in the forward direction is made, and when the second friction member 32 is operated so that the planetary carrier 24 is rotated in the reverse direction to control the reverse travel.

As described above, the rotation direction is the same or changed by the forward and backward control means 18 so that the power input to the first shaft 16 is continuously shifted through the first continuously variable means 34. .

That is, the first continuously variable transmission means 34 is disposed on the rear end of the first shaft 16 and the second shaft 36 arranged in parallel with a predetermined distance below the first shaft 16. And a drive and driven pulleys 38 and 40 whose diameters are variable by hydraulic pressure, and a belt 42 which interconnects the pulleys.

The drive and driven pulleys 38 and 40 are designed to allow endless speed change by a change in diameter, and FIG. 2 shows a configuration of an embodiment for making it possible.

The drive pulley 38 includes a fixed side sheave 42 and a variable side sheave 44. The fixed side sheave 42 is formed integrally with the first shaft 16 and has a variable side sheath. Eve 44 is engaged in the state which can move left and right on this 1st axis 16.

A casing member 46 is provided on the side of the variable side sheave 44 to form a hydraulic chamber 48 therebetween, and the hydraulic chamber 48 forms a flow path 50 formed in the first shaft 16. The pressure fluid generated by the driving force of the engine can be supplied through.

And the driven pulley 40 is made of a fixed side and the variable side sheaves 52 and 54 as described above, the fixed side of the sheave 52 is formed integrally with the second shaft 36, The variable side sheave 54 is coupled to move left and right on the second axis 36.

In addition, a casing member 56 is interposed in the variable side sheave 54 to form a hydraulic chamber 58, and the hydraulic chamber 58 is provided through a flow path 60 formed in the second shaft 36. The pressure fluid generated by the driving force of the engine can be supplied.

Therefore, when the rotational power is transmitted to the first continuously variable means 34 through the first shaft 16, the second shaft 36 is driven while the continuously variable shift is made, wherein the driving pulley 38 and the driven pulley ( The shift is made according to the change of the outer diameter of 40).

The conditions for changing the rotational speed are as follows: first, when the outer diameters of the driving pulley 38 and the driven pulley 40 are the same, and when the outer diameter of the second driving pulley 38 is larger than the diameter of the driven pulley 40; The diameter of the drive pulley 38 may be considered to be smaller than the diameter of the driven pulley 40.

In the first condition, when the outer diameters of the driving and driven pulleys 38 and 40 are the same, the transmission ratio is 1: 1.

And secondly, when the outer diameter of the drive pulley 38 is larger than the diameter of the driven pulley 40, the speed of the driven pulley 40 is increased because the number of rotation of the driven pulley 40 becomes larger, the third drive pulley When the outer diameter of 38 is smaller than the diameter of the driven pulley 40, the rotation speed of the drive pulley 38 becomes smaller than the rotation speed of the driven pulley 40, 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.

As described above, the rotational power in which the first stepless speed change is performed is performed again by the second stepless speed change means 62.

Like the first continuously variable means 34, the second continuously variable means 62 includes a drive pulley 64 disposed at the rear side of the second shaft 36, which is a driving shaft, and a lower portion below the second shaft 64. And a driven pulley 68 disposed on the third shaft 66 disposed thereon, and a belt 70 interconnecting them.

Since the configuration and operation of the drive and driven pulleys 64 and 68 forming the second continuously variable transmission means 62 are the same as those of the first continuously variable transmission means 34, detailed description thereof will be omitted.

In addition, the third shaft 66, which receives power from the second continuously variable transmission means 62, is connected to a drive shaft, not shown, at a rear end thereof by a predetermined means to drive the rear wheel, which is the driving wheel, through the rear wheel longitudinal reduction means. will be.

As described above, the rotational power whose rotation direction is determined from the forward and backward control means 18 according to the first embodiment of the present invention is continuously shifted secondarily through the first and second continuously variable means 34 and 62. The width is very large.

Accordingly, the output of the engine can be used more effectively, and power performance can be greatly improved.

Then, the rotational load is divided into two belts, so that the durability of the continuously variable transmission means can be improved.

FIG. 3 shows a second embodiment according to the present invention, which, in the first embodiment, arranges forward and backward control means 18 on a second shaft 36, and a second embodiment thereof. The operation of the example is the same as that of the first embodiment, so detailed description thereof will be omitted.

4 and 5 show the third and fourth embodiments according to the present invention, which, in the above first and second embodiments, instead of the torque converter 4 applied to the oscillating means 2 of these embodiments. As the conventional damper 72 is applied, the operation thereof is the same as in the above-described embodiment, and thus a detailed description thereof will be omitted.

As described above, it can be easily applied to the longitudinal rear wheel drive vehicle with a simple configuration, and the power of the engine can be effectively used by increasing the width of the continuously variable transmission area by two continuously variable means. It improves the power performance according to, and by dividing the load shared by the belt to share, it is possible to improve the durability.

Claims (7)

An oscillation means for transmitting the rotational power output from the engine to the first shaft; A double pinion planetary gear set, comprising: forward and backward control means disposed on the first axis to control forward and backward of a vehicle; A first continuously variable means disposed between the rear end of the first shaft and a second shaft disposed at a predetermined interval below the first shaft to continuously transmit the rotating power transmitted from the first shaft to the second shaft; and; A second shaft disposed between the second shaft and a third shaft arranged in the same line on the rear side of the first shaft to shift the continuously-rotated rotational power by the first continuously variable transmission means to transfer the third shaft to the third shaft; Stepless transmission means; A continuously variable transmission for a vehicle comprising a. The continuously variable transmission for a vehicle according to claim 1, wherein the oscillation means is formed of a torque converter. The continuously variable transmission for a vehicle according to claim 1, wherein the oscillating means is formed of a torsional damper. 2. The forward and reverse control means of claim 1, wherein the sun gear is integrally formed with the output side of the torque converter, and the planet carrier is connected to the output side of the torque converter via the first friction member, and the opposite side thereof is connected to the first shaft. And a ring gear connected to the housing via the housing and the second friction member to shift the ring gear. According to claim 1, wherein the first and second continuously variable means are formed so as to vary the diameter of the drive shaft and the driven and driven pulleys are arranged on the driven shaft which is arranged in parallel with a predetermined distance thereto, and the pulley A continuously variable transmission for a vehicle comprising a belt that interconnects. 2. The continuously variable transmission for a vehicle according to claim 1, wherein the oscillating means is composed of a torque converter, and the forward and reverse control means are arranged on the second axis. 2. The continuously variable transmission for a vehicle according to claim 1, wherein the oscillation means comprises a torsional damper, and the forward and reverse control means are disposed on a second axis.