WO2011116780A1

WO2011116780A1 - Transmission with self-adjusting transmission ratio

Info

Publication number: WO2011116780A1
Application number: PCT/EG2010/000012
Authority: WO
Inventors: Mohamed Helmy El Alaily
Original assignee: Mohamed Helmy El Alaily
Priority date: 2010-03-23
Filing date: 2010-03-23
Publication date: 2011-09-29

Abstract

Transmission which automatically and continuously changes its transmission ratio depending on the inertia of the output shaft, e.g. inertia of a vehicle. The transmission comprises an input planetary gear set (10) and an output planetary gear set (10) each having a sun gear, a planet carrier and a ring gear. An input shaft (15) of the transmission is coupled to the planet carrier of the input planetary gear set (10). The planet carrier of said input planetary gear set (10) is coupled to the ring gear of said input planetary gear set (10) via an overrunning clutch (16). The ring gear of the input planetary gear set (10) drives a gear pump (11), whereby the gear pump is connected via an input oil line (14) and an output oil line (13) to an automatic transmission valve (28) with a spring biased piston. The sun gear of said input planetary gear set (10) forms a mutual sun gear (18) with the sun gear of an output planetary gear set (9). The ring gear of output planetary gear set (9) can be braked by brake band (8) and is used as a drive-off element. The planet carrier of the output planetary gear set (9) is coupled to a forward/reverse gear unit (4,5,6,7) which is coupled to an output shaft (25) of the transmission which may drive the wheels of a vehicle. When both ring gears are fixed, the transmission ratios of the input planetary gear set (10) is lin:5out and that of the output planetary gear set 9 is lin:0,25out resulting in a final transmission ratio of lin:1,25out (=overdrive). When only the ring gear of the output planetary gear set (9) is fixed the overrunning clutch (16) will prevent the ring gear of the input planetary gear set (10) to run faster than the input shaft, i.e. the transmission ratio of the input planetary gear set (10) is lin:1out resulting in a final transmission ratio of lin:0,25out (=lowest gear ratio). When the car accelerates its inertia results in a high torque load at the output shaft (25) of the transmission and thus at the sun gear of the input planetary gear set (10). This causes an acceleration of the ring gear of the input planetary gear set 10 until the overrunning clutch engages which results in an transmission ratio of the input planetary gear set 10 of lin:lout and a final transmission ratio of lin:0,25out (=lowest gear ratio). The faster the ring gear of the input planetary gear set (10), the faster the gear pump (12) and the higher the pressure in input oil line (14), which causes the automatic transmission (valve 28) to open against its spring, which results in a reduced braking of the ring gear.

Description

TRANSMISSION WITH SELF-ADJUSTING TRANSMISSION RATIO

Technical Field

The field of Mechanical Equipments in automatic Transmissions. Background Art

Manual or Hydra-Matic Transmissions are designed to adapt the power of Engine to meet varying road and load conditions . The manual Transmission has three or more Set Forward gear ratios and one Reverse . with Pedal Clutch to disengage the Engine at every rising speed Set to avoid sudden shaking . The Fluid Coupling and Torque Converter with or without Clutch Direct Drive is used instead of standard Clutch with automatic or electronic Control in Hydra-Matic Transmissions The Torque Converter is used also to double the output Torque engine in infinite number of speed ratios between engine and wheels at every speed Set . In general Manual or Automatic or Electronic Transmissions raise from low to normal speed Set in two or more steps and has only one reverse speed Set with Selector Lever . and it uses one or more Planetary-gear sets to produce the desired gear ratios . Multiple disc Clutches and bands are used to control gear sets .

Disclosure of Invention

Continuous Function Transmission has speed ratio from [ lin : . 25out ] to [lin : 1.25out ] in Forward and Reverse direction. It can transmit continuously between this two limits in infinite number of speed ratios by automatic control driving system. Without disengage Engine from Wheels.

It consists of input planetary gear set (1 -10) and output planetary gear set (1-9) with Mutual sun-gear ( 1-18) between them in the ratios in [Fig 2 & 3] and manual selector direction equipment (1-6) . Input planetary-gear earner joined with input shaft (1 -1 1) and output planetary-gear carrier joined with output shaft.

Output ring-gear(5-31) is always fixed by Spring pressure of Band servo [ fig 5 ] to engage between Engine and output Shaft. Oil pressure (1-22) from Master Cylinder (1-3) push the piston of Band servo to release ring-gear drum at the first Half of Brakes-Pedal Path (1-26) to disengage the Engine before any active brakes action on the Wheels to transmit between the tliree main Positions [ R-N-F ]. When input and output rig-gears are fixed the input set will raise speed ratio between input shaft and mutual sun-gear to [1 in : 5out ] and the output set will reduce ratio between mutual sun-gear and output shaft to [lin : . 25 out ] so the final ratio between Engine and output shaft is [lin : 1.25out ] in over-drive speed output .

And when input ring-gear is free and output ring-gear is fixed. The overrunning clutch (1-16) will prevent it to pass input planetary-gear earner ( 1 - 10) speed and make a direct contact between Engine and mutual sun-gear ( 1 - 18) and the final ratio between engine and output shaft will be { l in : . 25out ] which is the lowest speed ratio.

A gear-pump ( 1 - 12) is joined with input ring-gear ( 1 - 1 1 ). the output ( 1 - 14) and input ( 1 - 13) oil lines from oil pump is controlled by automatic valve. When the car start to move its inertia creates an oil pressure from oil pump enough to push automatic valve cylinder to equilibrium point with valve spring force at largest oil escape hole to input pump line . Oil pump with input ring gear (1-1 1) will rotate faster than input shaft with input planetary-gear carrier (1-10). The over-running clutch (1 -16) will make a direct contact between Engine and mutual sun-gear to get the lowest speed ratio [1 :. 25 ] When the Care begin to move its inertia reduces gradually in direct proportion with pump pressure and the valve cylinder ( 1-28) take back by valve spring force and reduces oil escape hole area gradually to keep suitable oil pressure for every value of infinite number of inertia values and the relative velocity between input ring-gear and planetary-gear carrier will increase gradually until it reach a maximum value at equilibrium point between spring force and oil pressure created by Fractions and air resistance at steady Car velocity . This creates an infinite number of speed ratios between [lin : . 25out ] and less thane [ 1 in : l ,25out ] without any need to disengage Engine. Over-drive will decrease by increasing stedy Car velocity with Fractions and and air resistance.

Automatic Continuous Transmission has four (4) driving Tools :-

1- Fuel Pedal :- to control Engine power .

2- Brakes pedal :- (1-1) to disengage engine by Band servo first before any active brakes action on the wheels to transmit between the three main position [Reverse - Neutral - Forward].

3- Steering Wheel :- to change the Car direction. .

4- Selector Lever :- (1- 6) to transmit manually between the three main position [Reverse - Neutral - Forward} . Mathematical Proof :-

T= Torque . ω = r .

Tl & ω ΐ = for input Sun-gear.

T2 & 0)2 = for input Shaft .

T3 & 0)3 = for output Shaft .

T4 & co4 = for output Sun-gear.

If the Clutch is engage and input ring-gear is hold:-

Tl = 4( F x 2.3X ) = 9.2 FX [ Fig 2 ]

T2= 4( 2F x 5.75X ) = 46 FX [ Fig 2 ]

T1/T2 = co2/col = 9.2FX/46FX = 1/ 5 ( 1)

T3= 4( 2F x 5X ) = 40FX [ Fig 3 ]

T4 = 4( F x 2.5X ) = 10FX [ Fig 3 ]

T3/T4 - ω4/ω3 = 40FX/ 10FX = 4 (2)

Input and output Sun-gear are mutual so ω 1=ω4 (3)

From ( 1 ) & (2) & (3)

ω2/ω 1 x ω4/ω3 = ω2/ω3 = 4 x 1/ 5 = 1 /1.25 ( OVERDRIVE )

When Band is engage and input rig-gear is free . It will begin to rotate faster than planetary-gear canier with input Shaft . By Overrunning Clutch (1-16) the input set will be in a direct Contact between Engine and mutual Sun-gear .

So ω1 = ω2 = ω4 (4)

From (2) & (3) & (4)

ω2/ω1 x ω4/ω3 = ω2/ω3 =1 x 4/1= 4/1= 1/. 25 ( lowest velocity )

Brief description of the drawing:

1 - Brakes pedal. 2- Oil seal. 3- Master cylinder of Band and

Brakes. 4- Reverse gear.

5-Lubrication Oil input 6- Selector Liver of Positions [Reverse - neutral

- forward] 7-Forward gear

8- Band. 9- Output Planetary Set. 10- Input Planetary Set. 1 1 - Input

Ring-gear Joined with Oil

Gear Pump. 12- Oil-gear Pump. 13- Input oil pump line. 14- Output oil pump line. 15- Input Shaft.

16- Over-running Clutch. 17- Lubrication oil output. 18- Mutual Sun-gear for input and output Set.

19- Band Servo. 20- Central lubrication line. 21- The main axis. 22- Oil-pressure line of

Band servo. 23- Oil-pressure line of Brakes servo. 24- Wheels Brakes servo. 25- Output shaft. 26- Band influence range in Brakes pedal Pass. 27- Brakes influence in Brakes- Pedal Pass.

28- Automatic Transmission Valve. 29- Piston of Band servo. 30- Spring pressure of Band servo.

31 - Output Ring-gear Drum.

[ Fig 1 ] - Illustrative diagram with relative dimensions of A-C- Transmission.

[ Fig 2 ] - Relative dimensions of input Planetary Set,

[ Fig 3 J - Relative dimensions of output Planetary Set.

[ Fig 4 ] - Cross-section of Oil-pump.

[ Fig 5 ] - Cross-section of Band Servo.

Tools of controls in [ Fig 1 ] is imaginary figures to clear operating idea

Best mode for carrying out the Invention

The best mode for carrying out the continuous-Transmission represents in [ Fig 1 ] . it shows the Transmission construction with its Inner components that verifies :

1 - Small size and low weight.

2- Ease Industrial applicability.

3- Economy of cost.

4- Selector-Lever can exists behind the Steering- Wheel so the front seat can take three Sites instead of two.

5- Its driving system has many advantages:

1 - It has the same ability of forward direction in reverse direction.

2- it verifies a quick response to sudden effects.

3- It satisfied both the needs of beginners and professionals.

4- It can transmit automatically from lowest velocity to over-drive directly in a continuous function without any need to manual transmission from Low speed to High speed position.

6- It can be used with small engine power and high Load .

7- It can be used in wide range of industrial equipments .

Industrial Applicability

The design of Continuous Transmission in [ Fig 1 ] has easy industrial applicability:

1 - Its cover-body consists of two parts only. Joined together with binding bolts.

2- All its inner elements can be completely separated by disengage its two body parts. 3- All elements inside C-Transmission can be industrialized by direct operations without any difficulties.

4- It takes a small size and weight inside the car with lower cost.

5- Ease Conservation and Repairing.

Claims

1- First Claim :- This Invention has four new technical points characterized by:-

1 - Construction of A-C-Transmission in [ Fig 1 ].

2- Idea of Continuous-Transmission.

3- Operating function of Automatic transmission.

4- Developments of A-C-Transmission Driving system.

2- second Clainr.-According to first technical point in first claim :

Construction of A-C-Transmission characterized by:

1- It consists of input planetary-gear set (1 -10) and output planetary-gear set (1-9) with mutual sun-gear (1-18) between them in the ratio in [ fig 2&3 ] :-

Radius of input ring-gear : Radius of input sun-gear = 4 : 1

Radius of output ring-gear : Radius of output sun-gear = 3 : 1

Radius of input sun-gear : Radius of output sun-gear = 4.6 : 5

2- Input planetary-gear carrier (1- 10) is joined with input Shaft (1- 15) .

And input ring-gear is joined to oil pump (1-1 1) with input and output oil lines (1-13) & (1-14) between it and automatic valve (1-28) . Over-running clutch (1-16) is joined between input ring-gear and planetary-gear carrier.

3- Output planetary-gear carrier (1-9) is joined to selector direction equiipment with Selector Liver (1-6) to output Shaft. Output ring-gear is controlled by Band servo (1-19) through oil pressure line (1-22) from master servo (1-3) with Brakes Pedal (1-1).

3- Third Claim:- According to second technical point in first claim : Idea of Continuous-transmission characterized by:

1 - When the input and output ring-gears are fixed the input set will raise its speed ratio between input shaft and mutual sun-gear to [lin : 5 out] and the output set will reduce the ratio between mutual sun-gear and output shaft to [lin :, 25out ] So the final ratio between Engine and output shaft is [l in : 1.25out] in Over-Drive speed output.

2- When input rig-gear is free and output ring-gear is fixed the overrunning Clutch (1 - 1 1 ) will prevent it to pass the speed of input planetary-gear earner to make a direct contact between Engine and Mutual sun-gear. So the final ratio between Engine (Input Shaft) and

3- output Shaft will be [lin : . 25out ] which is the lowest transmission speed. 4- Rotation velocity of input rig-gear has two limits in transmission action between Zero and Engine rotation velocity. If this velocity can be changed gradually in continuous Function between this two limits the speed ratio can gradually transmit in continuous function between speed ratios [lin : . 25out ] and [lin : 1.25out ].

4- Fourth Claim :- According to third technical point in first claim :

Operating function of Automatic transmission characterized by :

1- The gear pump will rotate with rotation of input ring-gear . Oil will move through output oil line to automatic valve and bake through escape hale of automatic valve to input oil line bake to the pump . If oil escape hale is closed by cylinder valve the oil flue will stop inside its circuit and its pressure will increase enough to stop the rotating elements of the pump with input ring-gear at speed ratio [lin : 1. 25out ] . If escape oil hale is gradually opened the oil pressure will decrease gradually and input ring-gear speed rotation will increase gradually until it reach Engine speed and so speed ratio between [lin : 1. 25out ] and [lin : . 25out ].

2- When the Car start to move its Inertia creates an oil pressure from oil pump enough to push automatic valve cylinder to equilibrium point with valve spring force at largest oil escape hale to input pump line . Oil pump with input ring-gear will rotate faster than input Shaft with input planetary-gear carrier . The over-running clutch will make a direct contact between Engine and mutual sun-gear to get the ratio [lin : . 25] of lowest speed position.

3- When the Car begin to move its Inertia reduces gradually in direct proportion with pump pressure and the valve cylinder take back by valve spring force and reduces oil escape hale area gradually to keep suitable oil pressure for every value of infinite number of Inertia values and relative velocity between input ring-gear and planetary-gear carrier will increase gradually until it reach a maximum value at equilibrium point between spring force and oil pump pressure created by Fractions and air resistance at steady Car velocity just before oil escape hale is completely closed and input ring-gear is fixed . This creates an infinite number of speed ratios between [l in : . 25out ] and less thane [lin : 1. 25out ] without disengage Engine. Over-drive will decrease by increasing steady Car velocity with Fractions and air resistance . Also any slight leakage inside the pump will reduce the over-drive. 4- If angular velocity of input Shaft is smaller than the output Shaft . The input ring-gear with gear pump will change its direction rotation and also the direction of oil between pump and automatic valve which prevents it to bake again to the pump and prevent also the pump from rotating to get a Brake action from Engine to the wheels and reduce the car velocity. Also Engine can be start rotating by pushing the Car without starter like manual transmission.

5- Fifth Claim According to fourth technical point of first claim :

developments of driving system is characterized by

1- driving tools is ( Fuel Pedal - Brakes Pedal - Steering Wheel - Selector Liver)

2- Selector Liver is used only to transmit between three main positions (R- N- F)

3- Brakes Pedal is used to control both Brake Wheels and Band servo of output ring- gear to disengage Engine before Brakes action on the Wheels.