Wheel Based Transmission TRIZ Cases

A planetary hub transmission uses switchable coupling between the sun wheel and axle to cut 1:1 drive noise and actuator losses.

Variable-radius coupling in a bicycle CVT enables a wide gear range with lower shift force and less lubrication than derailleur systems.

Two serial transmission stages with independent load-shifting clutches enable four gear ratios and seamless shifting without stopping pedaling.

A dual-outer-gear pin-ring layout boosts torque density and ratio range while reducing pin bending and backlash in compact rotary drives.

An oval cam and deformable thin-ring bearing keep pins continuously engaged with gear teeth, reducing bending moments, wear, and surface pressure.

Magnetic attraction and repulsion drive a sliding block and lever to clutch an internal wheel hub gear with less weight, cost, and complexity.

Controlled locking of sun gears and planetary stages avoids torque flow reversal, enabling smoother, more compact e-bike transmission shifting.

A planocentric gear train boosts bicycle motor torque in a compact, lightweight assembly while enabling safe clutch-based mode switching.

A one-way clutch in the control assembly blocks reverse torque from the control gear, reducing control motor heating and improving efficiency.

A central machine gear between two gear stages guides pedal and motor torque together, enabling shift-under-load and better weight distribution.

Retractable pawls let one transmission shaft selectively engage multiple gears, cutting shaft count, dust exposure, and gearbox cost.

Segmented measuring and support areas let a crankshaft load cell separate axial loads from radial sensing for accurate torque calculation.

A pulley-and-belt CVT gearbox uses sliding weights and springs to replace manual shifting, avoiding chain throw and improving urban speed control.

A coaxial strain wave gear within the pedal crank delivers compact, low-noise, backlash-free torque transfer for electric bicycles.

A Wolfrom transmission with two axially adjacent ring gears boosts ratio while keeping an e-bike drive compact in the bottom bracket area.

Strain-sensor load cells capture bearing radial forces in harmonic pin ring transmissions, enabling accurate crankshaft torque calculation.

A rotary transmitter shifts pin engagement between inner and outer gears to deliver high torque density, low play, and compact rigidity.

A free-wheel reverse gear lets cargo bikes back up while the cranks keep turning in the normal pedaling direction.

Two shifting devices and a clutch enable compact bicycle power transmission with ratio preselection and lower weight.

Angle-bracket measuring lugs and axial support areas separate radial and axial loads for more accurate crankshaft torque measurement.

Separated measuring and axial support areas let a crankshaft load cell sense radial force accurately while protecting strain sensors from axial loads.

Radial clutches and a through-bolt axle simplify bicycle hub gear assembly while cutting weight and improving torque durability.

By overlapping the bearing and first transmission gear axially, this case cuts drive unit size and weight without sacrificing run-out accuracy.

Using a wave generator and flexspline, this pedal-cycle drive cuts weight and noise while delivering high reduction ratio and accurate torque transfer.

A coasting mechanism limits clutch tooth separation during overrunning to cut freewheeling noise, lag, and assembly complexity.

A two-part pivoting locking body enables bicycle transmission gear changes under high torque while maintaining tractive force.

A coasting surface keeps clutch members in partial contact during overrunning to cut freewheeling noise and lag while easing gear assembly.

Radially offset guide slots and relative stator rotation set traction planet skew angles for more precise speed ratio and torque control.

A harmonic drive replaces bulkier planetary gearing in pedal electric cycles to cut weight and noise while improving reduction ratio and accuracy.

A two-part pivoting locking body eases gear disengagement under load, reducing friction while maintaining tractive power during shifts.

Magnetic gear sensing lets the motor disconnect and reconnect during shifts, preserving regenerative recharge while easing torque-loaded gear changes.

A linked intermediate-disc drive transmits torque between misaligned e-bike spindles to cut Q factor, friction, and noise.

Variable cam gearing matches pedal position to vehicle speed, reducing stroke-start impact while improving power transfer efficiency.

Eccentric gears and offset stator slots adjust traction planet skew angle for faster, more precise CVT ratio control and torque transmission.

Radial slots and strain-sensor measuring regions separate axial support from radial load sensing for accurate crankshaft torque calculation.

A concentric inner gear, outer gears, pin ring, and rotary transmitter raise power density while keeping low play in tight installation space.

Radial-flap load cells and strain gauges improve e-bike spindle force measurement, enabling more accurate torque calculation with durable integration.

Staged cam ranges in linked axial ratchet rings smooth internal derailleur shifts, cut torque demand, and simplify multi-layer planetary gearing.

Two coaxial planetary gearsets and axial clutches expand ratio range to 560% while keeping shifting efficient, load capacity high, and weight low.

A split pinion assembly engages concentric face-gear rings to shift smoothly under pedaling while reducing friction, force, and wear.

Lockable bearings and linked planetary gear sets enable smooth hub gear shifting under load while reducing friction and noise.

Parallel transmission paths and a load-shifting clutch enable bicycle gear changes during pedaling without losing torque.

A rotational-to-linear shift mechanism uses torsional and clutch springs to cut shift load, wear, and timing sensitivity in hub gears.

A mechanical clutch lock keeps a normally-open saddle vehicle clutch engaged at stops to prevent slope rollback without a parking brake.

A coaxial bottom-bracket planetary gearbox uses freewheel clutches and brakes to deliver many gears, high power density, and better handling.

A high-speed input stage shrinks bottom bracket gearshift size and weight, enabling central motor integration with balanced e-bike weight.

Adjustable ring-to-disk eccentricity varies the transmission ratio in a compact pedal-assist drive that combines human and electric power.

A two-part locking body cancels clutch engagement despite friction, enabling muscle-powered gear shifts under load without interrupting drive force.