Torque peak detection and control mechanism for a CVP
First Claim
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1. A system for preventing over-torque in a transmission comprising:
- a torque sensing device drivingly engaged with a torque source and adapted to transfer torque from the torque source to an input of the transmission and adapted to measure an applied torque, being an amount of torque being transferred to the transmission from the torque source; and
a control mechanism operably engaged to the torque sensing device and adapted to modify a current state of the transmission based on the amount of torque measured by the torque sensing device;
wherein the transmission comprises a continuously variable transmission (CVT),wherein the CVT comprises a continuously variable planetary (CVP) variator and the current state of the transmission controlled by the control mechanism comprises a speed ratio of the CVP variator, andwherein the torque sensing device comprises a first rotatable member, a second rotatable member and a torsion spring disposed therebetween,wherein the first rotatable member is configured to transfer torque from the torque source through the torsion spring to the second rotatable member,wherein the second rotatable member is configured to transfer torque received through the torsion spring to the input of the transmission, andwherein the torsion spring produces a phase difference in rotations of the first and the second rotatable members, the phase difference being proportional to the torque applied by the torque source to the transmission and thereby providing a measurement of the torque being applied to the transmission.
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Abstract
A system for monitoring torque input into a transmission from a torque source comprising a torque sensing device and a control mechanism. The torque sensing device adapted to transfer torque from the torque source to the transmission input while measuring said torque. The control mechanism may be adapted to control the transmission in order to prevent damage from a high torque situation.
247 Citations
10 Claims
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1. A system for preventing over-torque in a transmission comprising:
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a torque sensing device drivingly engaged with a torque source and adapted to transfer torque from the torque source to an input of the transmission and adapted to measure an applied torque, being an amount of torque being transferred to the transmission from the torque source; and a control mechanism operably engaged to the torque sensing device and adapted to modify a current state of the transmission based on the amount of torque measured by the torque sensing device; wherein the transmission comprises a continuously variable transmission (CVT), wherein the CVT comprises a continuously variable planetary (CVP) variator and the current state of the transmission controlled by the control mechanism comprises a speed ratio of the CVP variator, and wherein the torque sensing device comprises a first rotatable member, a second rotatable member and a torsion spring disposed therebetween, wherein the first rotatable member is configured to transfer torque from the torque source through the torsion spring to the second rotatable member, wherein the second rotatable member is configured to transfer torque received through the torsion spring to the input of the transmission, and wherein the torsion spring produces a phase difference in rotations of the first and the second rotatable members, the phase difference being proportional to the torque applied by the torque source to the transmission and thereby providing a measurement of the torque being applied to the transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for preventing over-torque in a transmission comprising:
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a torque sensing device drivingly engaged with a torque source and adapted to transfer torque from the torque source to an input of the transmission and adapted to measure an applied torque, being an amount of torque being transferred to the transmission from the torque source; and a control mechanism operably engaged to the torque sensing device and adapted to modify a current state of the transmission based on the amount of torque measured by the torque sensing device; wherein the transmission comprises a continuously variable transmission (CVT), and wherein the CVT comprises a continuously variable planetary (CVP) variator and the current state of the transmission controlled by the control mechanism comprises a speed ratio of the CVP variator. wherein the control mechanism is adapted to provide rotation to one or more of an input disc of the CVP variator or an output disc of the CVP variator in response to the torque sensing device measuring the applied torque. - View Dependent Claims (9, 10)
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Specification