Motorcycle piston check

Motorcycle piston force gas pressure, ring its own elastic force, ring reciprocating inertia, ring and cylinder and ring groove friction, as shown. As a result of these forces, the ring will generate axial, radial and rotational movements. In addition, the motorcycle piston ring due to its movement characteristics, along with the irregular movement, inevitably occur due to axial irregular motion caused by the suspension and axial vibration, radial irregular motion and vibration, torsion and so on. These irregular movements often prevent the motorcycle piston ring from functioning. When designing a motorcycle piston ring, it is necessary to give full play to the favorable sports and control the unfavorable side.

Motorcycle piston disassembly, it is best to use piston rings to open the clamp this special tool. Such as manual disassembly, with your thumb to seize the opening to the ends of the smooth force until the piston ring diameter greater than the diameter of the piston head, the parallel ring into or out. Piston ring material for the alloy cast iron, lower strength, when installed into the piston groove, be careful carefully, so as to avoid fracture damage. In order to reduce the cylinder gas leakage from the ring opening, you must stagger the opening of each ring installation. The two rings of the piston, the first and second ring should be staggered opening 180 degrees installation; for a three-ring piston, the ring is usually open by 120 degrees staggered installation. No matter how many rings, the ring should not be toward the piston pin window. For pistons with piston pin positioning pins, the piston ring openings should be aligned with the dowel pins when installing. Piston ring installed piston into the cylinder, piston ring clamp should be used, the ring after clamping slowly into the cylinder.

Backlash check. Piston ring into the ring groove, the groove should have a certain backlash, the ring can move in the ring groove. If the backlash is too small, the ring can not move in the slot, resulting in easy to be stuck after carbon deposition, so that the sealing ring deteriorates; if the backlash is too large, the piston ring moves up and down in the ring groove , So that the ring groove and ring wear faster. The size of the backlash can be the amount of thickness rules. When the backlash is too small, it can be lapped on the glass to grind it. If the backlash is too large, it can not be used.

Piston ring leakage inspection. Piston ring opening clearance, clearance after the side should be carried out light leakage inspection, check the piston ring and the cylinder wall fit, the specific method is to level the piston ring into the cylinder, with a slightly smaller cylinder diameter cardboard Ring, and under the cylinder bulb irradiation, observe the ring and cylinder wall light leakage gap between the scope. The width of the piston ring light leakage gap shall not exceed 0.3mm; external arc curvature of the center angle should not be greater than 45 degrees, the same ring light leakage central angle should not exceed 60 degrees, 30 degrees left and right of the piston ring opening Light leakage is allowed.