KR19980041866U - Stepless transmission for rear wheel drive vehicles - Google Patents

Abstract

Its purpose is to provide a continuously variable transmission of a rear wheel drive vehicle that can simplify the construction, minimize manufacturing costs, pursue lightweighting, and minimize transmission shock and improve power transmission performance;

An oscillation means for transmitting the rotational power output from the engine to the first shaft;

Stepless speed change means disposed on the first axis and a second axis disposed adjacent thereto to perform stepless speed change;

Forward and backward control means for receiving the rotational power transmitted from the continuously variable transmission means and controlling forward and backward to be transmitted to the third shaft as an output shaft;

It is characterized by providing a continuously variable transmission for a rear wheel drive vehicle comprising a.

Description

Stepless transmission for rear wheel drive vehicles

The present invention relates to a continuously variable transmission for a rear wheel drive vehicle, and more particularly to a continuously variable transmission for a rear wheel drive vehicle to simplify the configuration, minimize the shift shock, and improve the power transmission performance.

The transmission of the vehicle has a function of transmitting the driving force of the engine to the drive 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 the 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 above-described transmission, 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.

In forming such a continuously variable transmission, it has been common to use a continuously variable transmission means that uses a belt and a variable diameter pulley, and a planetary gear set or a synchronous device as forward and reverse control means.

However, when the forward and reverse control means are applied to the planetary gear set or the synchronous device as described above, the configuration thereof becomes very complicated and the manufacturing cost increases, thereby causing a cost increase.

In addition, the configuration has a problem in that the weight thereof is very large, and therefore, it is counter to the pursuit of light weight of the vehicle.

Therefore, the present invention has been devised to solve the above problems, the object of the present invention is to simplify the configuration, minimize the production cost, pursue lightweight, minimize the shift shock and at the same time improve the power transmission performance. The present invention provides a continuously variable transmission for a rear wheel drive vehicle.

In order to realize this, the present invention includes an oscillation means for transmitting the rotational power output from the engine to the first shaft;

Stepless speed change means disposed on the first axis and a second axis disposed adjacent thereto to perform stepless speed change;

Forward and backward control means for receiving the rotational power transmitted from the continuously variable transmission means and controlling forward and backward to be transmitted to the third shaft as an output shaft;

It is characterized by providing a continuously variable transmission for a rear wheel drive vehicle comprising a.

1 is a block diagram of a continuously variable transmission according to the present invention.

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

Explanation of symbols on the main parts of the drawings

4: oscillation mechanism 14: stepless transmission means

18: driving pulley 20: driven pulley

46: forward and reverse control means 48, 50: forward and reverse input gear

52, 54: front, reverse gear 56, 58: first, second friction member

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention capable of realizing the above object in detail as follows.

1 is a configuration diagram of the 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 6 which rotates in direct connection with the crankshaft of the engine 2, and a turbine runner 8 which rotates together by oil which is disposed to face the pump impeller 6 and is ejected. ; And a stator 10 disposed between the pump impeller 6 and the turbine runner 8 to change the flow of oil to increase the rotational force of the pump impeller 6.

Accordingly, when the engine rotates, the oil filled in the torque converter 4 is ejected from the pump impeller 6 and supplied to the turbine runner 8 to drive the turbine runner 8 and then flow into the stator 10. .

In addition, the oil introduced into the stator 10 changes the direction and repeats the flow of the oil into the pump impeller 6, wherein the turbine runner shared by the stator 10 is rotated by the rotation of the stator 10. There is a difference between the rotational force of 8) and the rotational force of the pump, which is the torque conversion.

The rotational power output through the oscillation means 2 is shifted by the continuously variable transmission means 14.

The continuously variable transmission means 14 is disposed on the first shaft 12 and the second shaft 16 disposed at predetermined intervals on the first shaft 12 thereof, the diameter of which is driven by hydraulic pressure. And a driven pulley 18, 20, and a belt 22 that interconnects the pulleys 18, 20.

The drive and driven pulleys 18 and 20 are designed to allow endless speed change by a change in diameter, and FIG. 2 shows a configuration of one embodiment for enabling it.

The drive pulley 18 consists of the variable side sheave 26 of the fixed side sheave 24, the fixed side sheave 24 is formed integrally with the second shaft 12, The eve 26 is coupled in a state capable of moving left and right on the second axis 12.

A casing member 28 is provided on the side of the variable side 26 to form a hydraulic chamber 30 therebetween, and the hydraulic chamber 30 opens the flow path 32 formed on the first shaft 12. Through this, the pressure fluid generated by the driving force of the engine can be supplied.

And the driven pulley 20 is made of a fixed side sheave 34 and a variable side sheave 36 as described above, the fixed side sheave 34 is formed integrally with the second shaft 16, The variable side sheave 36 is coupled to move left and right on the second axis 16.

In addition, the variable side sheave 36 has a casing member 38 interposed therebetween to form a hydraulic chamber 40, and the hydraulic chamber 40 is provided through a flow path 42 formed in the second shaft 16. The pressure fluid generated by the driving force of the engine can be supplied.

Therefore, when the rotational dragging continuously variable transmission means 14 output from the first shaft 12 is transmitted, the second shaft 16 is driven while the stepless speed change is performed, wherein the driving pulley 18 and the driven pulley 20 are used. The shift is made according to the change of outer diameter of).

The conditions for changing the rotational speed are as follows: first, when the outer diameters of the driving pulley 18 and the driven pulley 20 are the same, and when the outer diameter of the second driving pulley 18 is larger than the diameter of the driven pulley 20; The diameter of the drive pulley 18 can be considered to be smaller than the diameter of the driven pulley 20.

In the first condition, when the outer diameters of the driving and driven pulleys 18 and 20 are the same, the transmission ratio is 1: 1.

And secondly, when the outer diameter of the drive pulley 18 is larger than the diameter of the driven pulley 20, the rotation speed of the driven pulley 20 is larger than the rotation speed of the drive pulley 18, so that the speed is increased, and the third drive pulley When the outer diameter of 18 becomes smaller than the diameter of the driven pulley 20, since the rotation speed of the drive pulley 18 becomes smaller than the rotation speed of the driven pulley 20, deceleration is made.

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.

Then, the rotational power output through the continuously variable transmission means 14 is transferred to the vehicle according to the driver's will by the forward and backward control means 46 disposed on the second shaft 16 and the third shaft 44. , Reverse control is controlled.

The forward and backward control means 46 has a predetermined distance from the forward and backward input gears 48 and 50 formed at a predetermined interval on the second shaft 16 and the second shaft 16. And forward and reverse gears 52 and 54 which are disposed on the third shaft 44 to be spaced apart from each other and are engaged with the forward and reverse input gears 48 and 50 without rotation interference. And first and second friction members 56 and 58 for selectively connecting the gears 52 and 54 to the third shaft.

In the above, the first and second friction members 56 and 58 are conventional multi-plate clutches as clutch means, and the first and second friction members 56 and 58 and the driving and driven pulleys 18 and 20 thereof. The operation is made by the hydraulic pressure supplied by the transmission control unit not shown. Of course, the idling gear 60 is interposed between the reverse input girder 50 and the reverse gear 54.

Accordingly, when the first friction member 56 is operated, the rotational power of the forward input gear 48 is transmitted to the third shaft 44, which is the output shaft, through the forward gear 52 to perform the forward driving.

When the second friction member 58 is operated, the rotational power of the reverse input gear 50 is transmitted to the third shaft 44 through the idling gear 60 and the reverse gear 54 to perform the reverse travel. .

As described above, according to the present invention, the continuously variable transmission device of the vehicle can be configured by the continuously variable transmission means and the forward and reverse control means. The configuration is simplified to minimize the manufacturing cost, and the forward and reverse control means use the multi-plate clutch. The bar is made in a manner that can be reduced in weight and can minimize shift shocks.

In addition, by using a torque converter as the oscillation means, it is intended to improve the power transmission performance.

Claims (4)

An oscillation means (4) for transmitting the rotational power output from the engine (2) to the first shaft (12); Stepless speed change means (14) arranged on the first axis (12) and a second axis (16) disposed adjacent thereto for stepless speed change; Forward and backward control means (46) for receiving the rotational power transmitted from the continuously variable transmission means (14) and forward and backward control to be transmitted to the third shaft (44) as an output shaft; Stepless transmission for a rear wheel drive vehicle comprising a. 2. The continuously variable transmission means (14) according to claim 1, wherein the continuously variable transmission means (14) is disposed on the first shaft (12) and the second shaft (16) disposed at predetermined intervals from the first shaft (12) thereof, the diameter of which is hydraulic. Driveless driven and driven pulleys (18) (20), and a belt 22 for connecting the pulleys (18, 20) to be interconnected by the variable speed of the rear wheel drive vehicle characterized in that it is made. The forward and backward control means 46 and the forward and backward input gears 48 and 50, which are formed at predetermined intervals on the second axis 16, and the second axis 16, respectively. The front and rear gears 52 and 54 which are arranged at a predetermined interval without rotation interference on the third shaft 44 and mesh with the front and rear input gears 48 and 50. And first and second friction members (56, 58) for selectively connecting the front and rear gears (52, 54) with the third shaft. The continuously variable transmission for a rear wheel drive vehicle according to claim 3, wherein the first and second friction members (56, 58) use a multi-plate clutch as a clutch means.