2results about How to "Large shifting range" patented technology

A front wheel is connected with a rear wheel through a bicycle beam, a steering column connected with the bicycle beam is arranged below a handlebar, a steering arm is arranged at the tail end of the steering column, the bicycle beam is provided with a steering column connected with the rear wheel, and the steering arm is connected with the steering column above the rear wheel through a steering push-pull cable; a first shock absorber connected with a rear wheel is arranged below the steering column; the saddle is arranged in the middle of the beam; a plurality of circles of end face gears with different diameters are arranged on the front wheel, a cylindrical gear meshed with the end face gears is arranged on the bicycle beam, and the cylindrical gear is connected with the handlebar through a variable-speed push-pull cable. A simple end face gear speed change mechanism is adopted, and the transmission efficiency is high; due to rear steering and front driving, steering is flexible, and the turning radius is small; the saddle is low in gravity center, small in wind resistance, anti-falling and safe; the speed change range is wide and can be fast or slow; chain deviation resistance caused by different surfaces of the chain disc is avoided; a large-modulus gear is adopted, so that the strength is high and durability is realized; the failure rate is low and maintenance is easy.

The utility model relates to the technical field of core drilling, especially to a gearbox for core drilling machine. The gearbox comprises a box body, an input shaft, an intermediate rotating shaft, an output shaft and a shift fork mechanism. The input shaft is provided with a driving gear. The intermediate rotating shaft is provided with a driven gear, a clutch gear and an inner-outer connecting gear in sequence from top to bottom. The driving gear and the driven gear are in mesh with each other. The clutch gear rotates with the intermediate rotating shaft and moves up and down along the axial direction of the intermediate rotating shaft. The inner surface of the inner-outer connecting gear towards the clutch gear end is provided with internal teeth, and the outer surface of the inner-outer connecting gear away from the clutch gear end is provided with external teeth. The output shaft is provided with a second gear and a first gear in sequence from top to bottom along the axial direction. The shift fork mechanism drives the clutch gear to move up and down along the axial direction of the intermediate rotating shaft. The gearbox can switch the output shaft between low-speed rotation and high-speed rotation, so that the drill rod can meet various working requirements of low-speed heavy load and high-speed light load, and the working range of the drilling machine is improved.