Advanced CVT modified

Advanced Continuously Variable Transmission Modified

Reduction of size and weight and increasing efficiency is of paramount importance to maximize transmission efficiency. In order to make continuous speed ratios and thereby increase efficiency, I have successfully developed a new concept Continuously Variable Transmission after spending several years to research. The concept is described below.

Advantages

Ø The new concept has very high ratio spread; ratio spread is 1: 16 and everything in between.

Ø It is of compact size; diameter is 250mm and width is 120mm for 1:16ratio spread.

Ø Since friction is not dependent on area but on normal force; only 4 drivers and pickups are necessary (these 4 drivers form two couples)

Ø Since the ratio spread is very high (1:16) the engine can run mostly at highest torque rpm for city and highest power rpm for highway and above all highest efficient rpm for highest efficiency. Since engine run at the most efficient rpm there will be a great deal of improvement in efficiency or reduction in fuel consumption (mpg or kmpl)

Ø Very Less weight

Ø Very low frictional losses

Ø Easy to mass produce

Ø Less maintenance, due to the fact that there is less abrasive loss because of the less frictional losses.

Ø High reliability

Ø Very high input output ratio spread within very compact size for a CVT

Ø Very Low friction and less maintenance of the CVT. High reliability and very low overall weight

Ø The new CVT is easy to mass produce.

Ø It requires less maintenance. It is of very high reliability.

Ø it is of very less weight and compact size (resulting in better packaging of vehicle)

Description of the Concept

There are two shafts with disks fixed at one end; one is for input and other is for output. In-between these two disks are 2 sets of 4 rollers each as shown in figure. These rollers are radially arranged with 90 degree offset. First set of rollers are connected to second set through gears. Rollers are capable of rotating in their center axis. And there are input pickups and output drivers that are radially movable inward and outward on these rollers, those input pickups and output drivers are constantly in touch with input and output disks respectively. Input pickups and output drivers are shaped like a smaller disk as shown in figure.

Working of the concept

Input pickups make the input rollers rotate at a speed according to the radial position of the input pickup. If the input pickups are located at outer most position the input rollers rotate at highest speed and if the input pickups is at inner most radial position the input rollers rotate at least speed. And for the other in-between states of input pickups input rollers rotate at those in-between speeds. The output drivers rotate at speed according to the speed of output rollers which are connected to input rollers. Input pickups gets rotation from input disk and input rollers delivers that rotation to output rollers, and output driver deliver that rotation to output disk. We can make the input-output ratio highest by positioning input pickups at the outer most position and output drivers at the inner most position. We can make input-output ratio least by positioning input pickups at the inner most position and output drivers at the outer most position. We can change the ratio to in-between states by positioning the pickups and drivers accordingly in the in-between positions. We can continuously vary ratio by smooth radial movement of both input pickups and output drivers those are in constant contact with input and output disks respectively. See the drawings in following pages to understand the working of the concept; an animation of both pickups’ movement is also attached.

The innovation in my concept CVT is that instead of belts used in existing CVTs my concept uses radial positioned rollers and pick-ups for the implementation of CVT. The essence of my concept is that if radially positioned input rollers are driven at their outermost ends, the input rollers will rotate at higher speed and these input rollers will drive out put rollers and thereby output drivers positioned at innermost end of output rollers and there by output disks at a higher speed than input pickup positioned at outer most position of input rollers. This phenomenon will be reversed if we position input pickups at inner most position and output drivers at outer most position of output rollers, i.e. output shaft will run slower than input shaft. And this speed ratio between output shaft and input shaft can be continuously varied by positioning input pickups and output drivers. Since there is no slip between pick up and disks the frictional losses will be very less than existing CVTs using belt driven pulleys. In belt driven pulleys belts are moved radially outward by high compressive force this will result in very high friction losses while releasing belt from pulleys.

This new CVT can be used in place of regular transmissions used in Cars, Trucks, SUVs, motor cycles, scooters and boats etc.

Approximately 50% less frictional losses compared to conventional CVTs can be achieved.

CVT’s maximum outer diameter size is varied from 50mm to 250mm for 10hp-1000hp powertrains respectively and thickness will vary from 30mm to 120mm for 10hp-1000hp powertrains respectively

In my concept with outer most diameter (where the rotating rollers end) of 4 times of inner most diameter (where the rotating rollers begin) the ratio spread will be 16:1. A 400rpm input disk and input pickup positioned at outer most diameter and the output driver positioned at inner most diameter , then output disk will run at 400 X 4 = 1600rpm. A 400rpm input disk and input pickup positioned at inner most diameter and the output driver positioned at outer most diameter, then output disk will run at 400 / 4 = 100rpm. So the input output ratio spread will be 16:1 for the above said dimensions and all the in-between ratios can be continuously varied. Positioning of input driver and output pick up is detailed in drawings in the following pages.

Animation of the working of CVT

Drawings of CVT are in following pages

Name Of The Inventor: Diji N. J.

Address: Nedunghayil house

Vennala P.O.

Ernakulam

Kerala

India

Phone : +91-04843929730

Mobile : +91-7736419388

Email: delvezone@hotmail.com

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