Title of Invention

AN AUTOMATED MANUAL TRANSMISSION SYSTEM FOR A MOTORCYCLE

Abstract An automated manual transmission system for a motorcycle, incorporating a single electric motor for gear shifting and clutch Actuation, comprising a gear slidably mounted on a motor shaft; a solenoid for engaging the gear with a clutch actuation gear box to transfer the motor torque to a master cylinder to dispense fluid to a slave cylinder whereby the amplified force in the slave cylinder actuates a clutch release bearing to disengage the clutch; a first sensor for sensing the disengagement of the clutch and actuating the solenoid, through the controller, to engage the gear with gear shift actuation gear box. the sensor, on sensing such engagement causing the controller to actuate the motor to rotate in a predetermined direction and transfer the torque to an internal gear shift mechanism to carry out up or down gear shift as determined by the user; a second sensor for sensing the completion of the gear shifting and actuating the solenoid, through the controller, to engage the gear with the clutch actuation gear box, the said controller thereafter actuating the motor to rotate in a predetermined direction, to cause the piston of the master cylinder to be retracted, thereby releasing the force on the slave cylinder piston, and causing the clutch springs to revert to normal position, thus re-engaging the clutch.
Full Text This invention relates to an automated manual transmission system for a motorcycle.
The known automated manual transmission (AMT) for a motorcycle involves separate mechanisms for carrying out clutch actuation and gear shift along with conventional wet multi-plate clutch and constant mesh gear box. The clutch actuation mechanism involves an electric motor, gear box, hydraulic master cylinder, fluid container, hose and hydraulic slave cylinder acting on the clutch. The gear shift mechanism, on the other hand, involves a separate electric motor , gear box, linkage acting on the internal gear shift mechanism. A controller controls the direction of rotation of both motors as well as the time duration of their operation.
The gear shifting procedure involves the disengagement of the clutch, movement of shifter forks for changing gears and engagement of clutch. In a conventional gear box clutch and gear shift are manually actuated whereas in an automated manual transmission, these operations are automated.
In the known system, the electric motor in the clutch actuation mechanism is responsible for clutch disengagement and engagement. The torquo delivered by the motor is amplified and results in a hydraulic master cylinder piston displacement which causes fluid to be displaced from the master cylinder to the slave cylinder, to result in amplified force in the slave cylinder. The slave cylinder piston is directly linked to the

clutch release bearing and therefore the amplified force acts on the clutch release bearing for disengaging the clutch. For engaging the clutch the motor rotates in the opposite direction removing the force on the slave cylinder by retracting the master cylinder's piston back. As soon as the reacting force acting on the clutch release bearing is removed, the clutch springs expand engaging the clutch.
After sensing clutch disengagement using a sensor, the controller actuates the motor and this in turn rotates a linkage through a gear. The linkage rotates the internal gear shaft mechanism which shifts gear either up or down as required by the user.
Once the gear shift procedure is completed, the controller actuates the first motor to rotate in the reverse direction to engage the clutch. As the motor rotates in the reverse direction, the master cylinder piston retracts and therefore the force on the master cylinder and the slave cylinder holding the clutch in the disengaged position is released and the clutch springs return to normal position engaging the clutch .This procedure also displaces the slave cylinder's piston to its original position.
The major drawback in the above existing system is that the clutch disengagement, gear shift and clutch engagement are discrete operations. Two different motors are used which increase costs as well as weight. Provision of space also becomes a factor for consideration.

To overcome the foregoing drawback this invention proposes an automated transmission system incorporating a common electric motor, the said transmission system being capable of carrying out all three distinct operations, namely, clutch disengagement, gear shifting and clutch engagement during any gear shift operation. The proposed system would thus help in achieving saving on caS$, weight and space.
This invention, therefore, proposes an automated manual transmission system for a motorcycle incorporating a single electric motor for gear shifting and clutch actuation, which according to this invention, comprises a gear slidably mounted on a motor shaft; a 4solenoid for engaging the gear with a clutch actuation gear box to transfer the motor torque to a master cylinder to dispense fluid to a slave cylinder, whereby the amplified force in the slave cylinder actuates a clutch release bearing to disengage the clutch; a first sensor for sensing the disengagement of the clutch and actuating the solenoid, through the controller, to engage the gear with gear shift actuation gear box, the sensor, on sensing such engagement, causing the controller to actuate the motor to rotate in a predetermined direction and transfer the torque to an internal gear shift mechanism to carry out up or down gear shift as determined by the user; a second sensor for sensing the completion of the gear shifting and actuating the solenoid, through the controller, to engage the gear with the clutch actuation gear box, the said controller thereafter actuating the motor to rotate in a

predetermined direction, to cause the piston of the master cylinder to be retracted, thereby releasing the force on the slave cylinder piston, and causing the clutch springs to revert to normal position, thus re-engaging the clutch.
This invention will now be described with reference to the accompanying drawings which illustrate, by way of example, and not by way of limitation, one of possible embodiments of of the automated manual transmission proposed herein.
A solenoid T actuates a gear 2 slidably mounted on a motor shaft 1. Once the gear shift is triggered by the user, the solenoid first engages gear 2 with clutch actuation gear box 3 and then motor 5 transfers torque to master cylinder 6 which in turn displaces fluid to slave cylinder 9. The force amplified in the slave cylinder acts on the clutch release bearing B to disengage the clutch,
A sensor SI senses clutch disengagement. Controller C then sends a signal to solenoid T for engaging the gear 2 with gear shift actuation gear box 4. This operation is equally sensed by a sensor S2 and feed back is provided to the controller C which then sends a signal to motor 5 to rotate in a specific direction and transfer torque to an internal gear shift mechanism M for carrying out either up or down gear shift as determined by the user. Another sensor S2 fitted on the gear box G senses the gear shifting operation, The controller C, after the gear shifting operation is over, sends a signal to solenoid T to engage gear 2 with clutch actuation gear box 3. After sensing this operation is

over, controller sends a signal to motor 5 to rotate in a specific direction to retract the piston of the master cylinder 6, which releases the force on the piston of the slave cylinder 9. As a result, clutch springs expand back to normal condition reengaging the clutch.
Thus the whole gear shift operation is carried out using a single electric motor instead of two.
By reason of the foregoing and apart from the advantages already stated, there is a substantial reduction in part count.
It will be appreciated that various other embodiments of this invention are possible without departing from the scope and ambit of this invention.


















We Claim:
1 .An automated manual transmission system for a motorcycle, incorporating a single electric motor for gear shifting and clutch actuation, comprising! a gear slidably mounted on a motor shaft; a solenoid for engaging the gear with a clutch actuation
i
gear box to transfer thfe motor torque to a master cylinder to dispense fluid to a slave cylinder, whereby the amplified force in the slave cylinder actuates a clutch release bearing to disengage the clutch; a first sensor for sensing the disengagement of the Clutch and actuating the solenoid, through the controller, to engage the gear with gear shift actuation gear box, the sensor, on sensing such engagement, causing the controller to actuate the motor to rotate in a predetermined direction and transfer the torque to an internal gear shift mechanism to carry out up or down gear shift as determined by the user; a second sensor for sensing the completion of the gear shifting and actuating the solenoid, through the controller, to engage the gear with the clutch actuation gear box, the said controller thereafter actuating the motor to rotate in a predetermined direction, to cause the piston of the master cylinder to be retracted, thereby releasing the force on the slave cylinder piston, and causing the clutch springs to revert to normal position, thus re-engaging the clutch. 2.An automated manual transmission system for a motorcycle substantially as herein described and illustrated.


Documents:

1208-CHE-2007 CORRESPONDENCE OTHERS 22-06-2011.pdf

1208-CHE-2007 EXAMINATION REPORT REPLY RECIEVED 14-01-2011.pdf

1208-CHE-2007 POWER OF ATTORNEY 14-01-2011.pdf

1208-che-2007-abstract.pdf

1208-che-2007-claims.pdf

1208-che-2007-correspondnece-others.pdf

1208-che-2007-description(complete).pdf

1208-che-2007-drawings.pdf

1208-che-2007-form 1.pdf

1208-che-2007-form 26.pdf

1208-che-2007-form18.pdf


Patent Number 248585
Indian Patent Application Number 1208/CHE/2007
PG Journal Number 30/2011
Publication Date 29-Jul-2011
Grant Date 27-Jul-2011
Date of Filing 11-Jun-2007
Name of Patentee TVS MOTOR COMPANY LTD.
Applicant Address JAYALAKSHMI ESTATES, NO.8 HADDOWS ROAD, CHENNAI-600006.
Inventors:
# Inventor's Name Inventor's Address
1 RANJIT PHALTANE TVS MOTOR COMPANY LTD CHENNAI 600006.
2 G MARUTHI TVS MOTOR COMPANY LTD., CHENNAI,600006
3 T M MANOZKUMAR TVS MOTOR COMPANY LTD., CHENNAI,600006
PCT International Classification Number F16H61/28
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA