What is the standard tooth profile of the cycloid needle of the reducer

The standard gear meshing with the standard tooth profile of the standard needle roller, and the ring screw tooth profile with the pin wheel and no meshing clearance is called the standard tooth profile.Select the geometric center of the cycloidal pin gear with the origin, and the axis passing through the origin and coincident with the axis of symmetry on the shaft, as the axis.In order to compensate for manufacturing errors, facilitate assembly and disassembly, and ensure lubrication, there must be a meshing gap between the filamentary gear and the pin in the actual application of the spin-loaded pin gear planetary transmission.Therefore, the actual cycloidal gear cannot adopt the standard tooth profile, but must be modified.

When the conditional gear is processed by the displacement modification method, the eccentricity, radius and transmission ratio of the ground gear shape are the same as those of the standard gear shape.The difference is that when the grinding wheel is moved to the distance from the center of the table, negative values ​​should be used instead of people.Therefore, the molars are smaller than standard tooth profiles and mesh with standard rollers, which naturally create mesh backlash.When the wheel moves away from the center of the table, it is called positive displacement.When the conditional gear is machined by the equidistant modification method, the adjustment and parameter selection of the machine tool movement are basically the same as those of the standard tooth profile.The difference is that the arc radius of the grinding wheel is increased from standard to RP+TRP.Although the short-amplitude coefficient of the profile of the ground cycloidal gear does not change, the two equidistant curves have the same short-amplitude annular ring slip equidistant value as the standard tooth profile.In this way, the ground teeth are smaller than those with a standard tooth profile, and when meshed with a standard pin wheel, mesh backlash will be created.

When cycloidal pin gear reducers handle cycloidal gears, the adjustment of the machine tool is exactly the same as the standard tooth profile.Only after grinding the standard tooth profile for the first time, disconnect the connection between the gear splitting mechanism and the eccentric mechanism, and then move the gear of the gear splitting mechanism to rotate the cycloidal workpiece by a small angle, so that the cycloidal wheel can be changed during the grinding process The original position, and according to the original method, perform the second grinding, which will make the thickness of the entire tooth of the cycloid wheel slightly thinner, and the cogging slightly increased.In theory, cycloidal wheels ground with angular modification are installed in standard needle rollers which still belong to the conjugate tooth profile.At this time, the number of pressure teeth is large, the transmittance is stable, and the side clearance is uniform, but there is no clearance contact between the tooth top and the tooth root, so it cannot compensate the manufacturing error chain of the radial dimension and meet the lubrication requirements, so it cannot be separated use.In this way, other methods must be added to modify the addendum and root to ensure proper radial clearance.For the pin wheel transmission of the control ring roller reducer with a large transmission rate, due to the small tooth spacing, if the idle tooth shape is to be ensured, the top cutting is not allowed, the allowable pin tooth radius is small, so the pin tooth has no pin The pins of the toothed sleeves are only for transmission.At this time, there is sliding friction between the cycloidal wheel and the pin teeth, which causes the temperature to rise and greatly reduce the transmission efficiency.In order to improve the transmission performance, one of the effective measures is to increase the radius of the pin teeth and install a pin gear sleeve on the tooth pin, so as to change the rolling friction between the cycloid wheel and the pin teeth.When using a cycloid speed reducer, please pay attention to choose a standard windmill.