Application of eccentric sleeve in K series reduction motor assembly

The K series reduction motors are widely used in various industries such as wind power, coal mining, metallurgy, and cement due to their high load-bearing capacity, high transmission efficiency, and long service life. The current trend is that bevel gear reducers are gradually developing towards larger sizes due to their high tooth surface hardness and slow gear wear. The contact state of the tooth surface mainly depends on the machining accuracy of the housing and gear components, as well as the assembly accuracy of the K-series reduction motor, and it is difficult to improve it through running in. When designing a bevel gear reducer, we added an eccentric sleeve structure to compensate for machining errors in the housing and gears by adjusting the eccentricity between the bearing seat hole and the outer ring of the K series gear reducer motor housing, thereby improving the assembly accuracy of the gearbox.
The working principle of the K-series deceleration motor eccentric sleeve:
There is a design deviation between the outer circle center of the eccentric sleeve and the inner hole center of the K-series reduction motor. When the outer circle of the eccentric sleeve rotates axially in the bearing seat hole of the housing, the center of the circle moves in a circular motion. The axis of the gear shaft of the bevel gear reducer also moves in a circular motion with the eccentric sleeve through the bearing, which means that the axis of the gear shaft can be changed. The gears fixed on the shaft can be adjusted radially. If both shafts are equipped with eccentric sleeves, the adjustment range becomes twice.
The application range of K-series deceleration motor eccentric sleeve:
Compensation for the center distance error, tooth orientation error, and parallelism error of the bearing holes in the housing of the bevel gear reducer; Adjustment of tooth flank clearance, contact position and length between working and non working surfaces of gear teeth.
Design considerations for eccentric sleeve:
The number of eccentric sleeves in the K series deceleration motor is generally more than the number of adjusted quantities, which is a multi degree of freedom coefficient. The structural design adopts the form of simultaneously assembling eccentric sleeves on the coaxial bearings at both ends. The selection of eccentricity mainly considers the ability of the eccentric sleeve to compensate for manufacturing errors and meet the requirements of tooth surface contact. Within the limit adjustment range of the eccentric sleeve of the bevel gear reducer, it will not cause tooth interference and the service life coefficient will be less than the design low value. The eccentric sleeve can self lock at any position and has sufficient safety factor. In addition, attention should be paid to its impact on clearance and side clearance. For ease of operation, the eccentricity should be as small as possible, generally ranging from 0.25-0.5mm. The dimensional tolerance of the inner hole and outer circle of the eccentric sleeve is taken as G7/H6 or H7/H6. The eccentric sleeve material is generally made of 45 steel. When the outer diameter is less than 400mm, forgings are used. When the outer diameter is greater than 400mm, castings are used. Heat treatment is carried out by quenching and tempering, and the hardness is between 230-270HB.
The adjustment process of the eccentric sleeve of the K series reduction motor: Before assembly, the following preparations should be made: recheck the dimensions of the outer and inner diameters of the eccentric sleeve to ensure compliance with the drawing requirements. For ease of adjustment during assembly, the eccentric sleeve and bearings, eccentric sleeve and box body, and box cover of the bevel gear reducer should all be trial assembled. Ensure that the outer ring of the umbrella gear reducer bearing can move axially along the inner hole of the eccentric sleeve. Otherwise, assemble the inner hole of the eccentric sleeve to ensure that the outer circle of the eccentric sleeve can rotate flexibly in the bearing seat hole of the box body and cover. Otherwise, assemble the bearing seat hole.