Electric bicycle crankset assembly structure and shaft sleeve cold heading forming die

• Main Authors: WANG YIFEI, DONG RUIXUAN, LU QINGQUAN, LU MINGKUAN
• Format: Patent
• Language: Chinese; English
• Published: 07.05.2024
• Subjects: CYCLE AXLE SUSPENSIONS; CYCLE FRAMES; CYCLE SIDE-CARS, FORECARS, OR THE LIKE; CYCLE STEERING DEVICES; CYCLES; FORGE FURNACES; FORGING; HAMMERING; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; POWERED PROPULSION OF SLEDGES OR; PRESSING METAL; PUNCHING METAL; RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FORCYCLES; RIVETING; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES; TRANSPORTING

The utility model discloses an electric bicycle crankset assembling structure and a shaft sleeve cold heading forming die. The electric bicycle crankset assembling structure comprises a shaft sleeve, a crankset, a middle shaft and a fixing screw. The middle shaft is provided with a radial through hole; the shaft sleeve is a cylindrical sleeve with an annular flange at one end and is sleeved outside the middle shaft, a group of projection welding spots are arranged on the end surface of the inner side of the annular flange, an anti-rotation structure matched with the chain wheel is arranged on the outer circular surface of the shaft sleeve close to one end of the annular flange, and a screw assembly hole is formed in the other end of the shaft sleeve; the crankset is sleeved outside the shaft sleeve, a central hole of the crankset is matched with an anti-rotation structure of the shaft sleeve to realize circumferential positioning, and the crankset is also welded with a convex welding spot arranged on the shaf