Oil-free air compressor transmission structure, oil-free air compressor and vehicle

An oil-free air compressor transmission structure, comprising a motor housing, a motor assembly, and a bearing assembly, the motor assembly is arranged inside the motor housing, the motor assembly comprises an inner shaft and a rotor fixedly sleeved on the outer surface of the inner shaft, the inner shaft is rotatably connected to the motor housing through the bearing assembly;

• further comprising a box body, a power component, and a large bearing, the box body is detachably connected to the motor housing, the power component comprises a first half-crank and a second half-crank, the first half-crank and the second half-crank are mutually interlocked and connected to form a crank shaft, the crank shaft is rotatably connected to the box body through the large bearing;
• wherein, the second half-crank is located between the first half-crank and the inner shaft along the axial direction of the inner shaft;
• characterized in that, the large bearing is sleeved on the crank shaft, the large bearing is used to bear a part of the load of the motor assembly, wherein the load of the motor assembly refers to the axial and radial forces of the inner shaft and the rotor of the motor assembly;
• a segment of the second half-crank away from the first half-crank along the axial direction of the inner shaft is a first segment, the first segment and the inner shaft are coaxially arranged;
• further comprising a connecting member, the first segment and the inner shaft can be separated from each other, or only detachably connected through the connecting member;
• wherein the connecting member is a bolt or a screw;
• the bearing assembly comprises a front bearing and a rear bearing, wherein the inner shaft is supported by the motor housing through the front bearing and the rear bearing, and the bearing outer rings of the front bearing and the rear bearing respectively have a clearance fit with the motor housing, the front bearing is located between the large bearing and the rear bearing along the axial direction of the inner shaft;
• and, the size and support strength of the large bearing are higher than the size and support strength of the front bearing and the rear bearing;
• or,
• the bearing assembly only comprises a rear bearing, wherein a segment of the inner shaft away from the first half-crank is a rear segment, the rear segment of the inner shaft is supported by the motor housing through the rear bearing, the bearing outer ring of the rear bearing has a clearance fit with the motor housing;
• and, the size and support strength of the large bearing are higher than the size and support strength of the rear bearing.