4results about How to "Reduce axial force" patented technology

This application discloses an electronically controlled moving chainring mechanism, a shifting system, and a bicycle. The bottom bracket is installed in a cylinder body and is fixed circumferentially to the bushing. The piston is detachably connected to the bushing. When the pedal drives the bottom bracket to rotate, the bottom bracket drives the bushing to rotate, which in turn drives the chainring to rotate. When the freewheel shifts gears, the electronically controlled drive mechanism can actively drive the piston to move axially, and drive the bushing and chainring to adjust their positions synchronously, thereby reducing the angle between the chain, chainring, and freewheel, and improving riding efficiency. Furthermore, the reduced angle expands the meshing range between the chain and the teeth, reducing chain slippage, asymmetrical wear, and axial stress, lowering the risk of tooth deformation, and extending the service life of components. Compared to the traditional passive adjustment method of the chain driving the chainring, this embodiment actively controls the chainring movement through an electronically controlled drive mechanism, resulting in smoother and more precise chainring movement, avoiding jamming, and ensuring stable positioning after reaching the correct position, thus improving riding stability.

This invention discloses a pressure-balanced composite sealing ball valve, comprising a valve body, a valve stem, a valve core, and a composite sealing structure. The valve body has a fluid channel and a first mounting hole, which communicates with the fluid channel. At least a portion of the valve stem is connected to the interior of the first mounting hole, and the valve stem can be driven to rotate. The valve core is disposed inside the valve body and is movably fitted with the valve stem. The valve stem has a balance hole, and the valve core has a guide hole, which communicates with the guide hole. The composite sealing structure is fitted around the outer circumference of the valve stem and is sealed to the inner wall of the first mounting hole. When the fluid channel is open, fluid enters the first mounting hole, contacts and forces the composite sealing structure to deform axially on the valve stem. This ball valve employs a composite sealing structure, ensuring a good seal between the valve stem and valve body even under high pressure, high-frequency operation, or the penetration of small molecule media. Simultaneously, the balance hole on the valve stem reduces the operating torque of the valve stem.

This application discloses a direct-drive chainring mechanism and a bicycle. By placing a linear motor between the frame and the bottom bracket, and fitting the motor rotor onto the bottom bracket to allow it to move axially along the bottom bracket, and connecting a bushing fitted onto the bottom bracket to the motor rotor, the chainring can be moved synchronously along the bottom bracket axially by controlling the working state of the motor stator. This adjusts the angle between the chainring and the chain, reducing the deviation of the angle from the ideal zero degree, decreasing the axial component force generated by the angle when the chain transmits driving force, increasing the effective power to drive the freewheel, and ultimately improving riding efficiency. This embodiment of the application provides a reliable path for optimizing the power transmission efficiency of a multi-speed bicycle by utilizing the linkage mechanism between the linear motor and the chainring. Furthermore, because the angle is smaller, the meshing range between the chain and the teeth is wider, reducing chain slippage, asymmetrical wear of the teeth, and axial force on the teeth.

The utility model relates to a shield pump capable of realizing rotor axial force self-balancing, which comprises a motor shell, and a motor front end cover and a motor rear end cover which are respectively arranged at two ends of the motor shell, a shielding sleeve is arranged in the motor shell, a stator is arranged between the shielding sleeve and the motor shell, a main rotating shaft is arranged in the shielding sleeve, and a rotor is arranged in the main rotating shaft. The main rotating shaft is provided with a rotor, and the motor front end cover and the motor rear end cover are both provided with sliding thrust bearings assembled with the main rotating shaft. A shielding sleeve inner cavity is formed in the main rotating shaft, a bearing runner is arranged in the sliding thrust bearing, a center hole runner is arranged in the main rotating shaft in the axial direction, a runner water outlet is formed in the main rotating shaft, and the bearing runner, the shielding sleeve inner cavity, the bearing runner, the center hole runner and the runner water outlet form an inner circulation runner. The shield pump has the effect of prolonging the service life of the shield pump.