The invention discloses a multi-row ball type slewing bearing and a machining method thereof. The multi-row ball type slewing bearing comprises an outer ring 1, an inner ring 2 and steel balls 3 and is characterized in that the inner annular surface of the outer ring 1 is provided with at least three rows of inner raceways at intervals according to a certain size; the outer annular ring of the inner ring 2 is also provided with at least three rows of raceways which correspond to the inner raceways of the outer ring; the inner raceways and the outer raceways are in the same shape, and corresponding raceways form complete steel ball raceways; and the steel balls 3 are evenly distributed in each row of steel ball raceway and separated by insulating blocks 6 or solid retainers 7. The multi-row ball type slewing bearing has three or over three rows of bearing rollers, thereby having high bearing capacity. Meanwhile, because the slew bearing needs less materials due to compact structure, thereby having good economic performance. The multi-row ball type slewing bearing is suitable for working places requiring the slewing bearing with high bearing capacity and good rigidity and limited in mounting space of the slewing bearing.

Multi-row ball type slewing bearing and machining method thereof

The invention discloses a six-row roller-type pivoting support and a processing method thereof. The six-row roller-type pivoting support comprises rollers, an outer ring, an inner ring and a median ring, and is characterized in that the rollers are arranged in six rows and are arranged between the median ring and the outer ring and between the median ring and the outer ring. In the roller-type pivoting support of the invention, the number of roller paths of the existing roller-type pivoting support is increased to 6 from 3, thus the number of rows of the rollers are increased to 6 at the left and the right from the original number 3, namely the radial rollers at the middle row of the three roller paths of the middle ring and the outer ring and at the middle row of the three roller paths of the middle ring and the inner ring are specially used for bearing radial force; and the rest four rows of rollers bear axial force and tilting moment. Compared with the existing roller-type pivoting support, the six-row roller-type pivoting support improves the bearing capacity by more than one time when the diameter of the pivoting center of the rollers and the diameter of the rollers are the same with those of the existing roller-type pivoting support. The pivoting center of the invention is suitable for workplaces bearing larger radial force and peculiarly large axial force and tilting moments.

Five-row pin roller type pivoting support and processing method thereof

The invention discloses a machining method of a worm gear type pivoting support and belongs to the technical field of pivoting support machining. The machining method of an outer ring of the worm gear type pivoting support comprises the steps of rough turning, half finish turning, heat treatment, finish turning, hobbing, scribing, drilling and lathe grinding. The machining method of a middle ring of the worm gear type pivoting support comprises the steps of rough turning, boring and drilling, half finish turning, heat treatment, finish turning, scribing, drilling and lathe grinding. The machining method of an inner ring of the worm gear type pivoting support comprises the steps of rough turning, half finish turning, finish turning I, gear shaping, heat treatment, finish turning II, scribing, drilling and lathe grinding. The pivoting support machined through the machining method can meet the requirements of entertainment machinery, light industry machinery, filling machinery and the like for bidirectional rotational motion and bear large turning torque, the abrasion resistance of gear teeth is remarkably improved, installation between a sealing ring and the pivoting support is firmer, the sealing ring and the pivoting support are not prone to falling off, and the service life of the worm gear type pivoting support is greatly prolonged.

Machining method of worm gear type pivoting support

The invention relates to a design method and a device of structural parameters of major and minor semi axes of an elliptical race ball bearing. The design method comprises the steps of firstly, calculating radial displacement, axial displacement and corner displacement of an inner ring of the bearing; calculating normal contact loads of all contact positions according to the obtained displacements to determine the contact load of a rolling body with the maximum load and the maximum contact stress received by the bearing; drawing a bearing static load curve through adopting the maximum contact stress as the index, and determining a circle radius coefficient t and a design contact angle according to limit load parameters of the bearing; and finally, calculating a major semi-axis and a minor semi-axis of an ellipse according to the obtained design contact angle, the circle radius coefficient and the radius of a steel ball. According to the design method, the major semi-axis and the minor semi-axis of an elliptical race can be quickly and accurately designed through the process, the problem that the selection of the major semi-axis and the minor semi-axis of the bearing elliptical race has no reference is solved, and reference can be provided for judgment of utilization conditions of external loads according to the adopted static load curve design drawing method.

Design method and device of structural parameters of major and minor semi axes of elliptical race ball bearing

The roller bearing comprises an inner ring, an outer ring, at least one row of rolling elements which are arranged between the rings in order to form an axial thrust which can transmit axial forces, and a row of rolling elements arranged between the rings in order to form a radial thrust which can transmit radial forces. The inner ring comprises an annular groove which extends towards the interior from an outer surface of the ring, and forms a raceway for the rolling elements of the radial thrust.

Roller bearing with at least two rows of rolling elements, in particular for a tunneler

The invention discloses a single-raw ball rotation bearing with ellipse tray, which is characterized in that: its tray is ellipse, whose parameters of long semi axle and short semi axle can be calculated according to the steel ball curvature radius, the curvature radius and the contact angle at the contact point between the tray and the steel ball. The formula of long semi axle and short semi axle are provided. The invention can improve the working property and the service life, while the bearing ability is increased 33%.

Single-row ball type slewing bearing of elliptic roller track and method for making same

The utility model discloses a five-roller-row type slewing bearing, which comprises rollers, an outer ring and an inner ring. Mounting holes are arranged on the axial planes of both the inner ring and the outer ring. The five-roller-row type slewing bearing is characterized in that the five rows of rollers are arranged between the inner ring and the outer ring. Five raceways of the five-roller-row type slewing bearing are increased in number compared with an existing roller type slewing bearing having three raceways, so that the rows of the rollers are increased from original three rows into five vertical rows. The middle row of radial rollers are especially used for bearing axial force, and the remaining four upper rows of axial rollers are used for bearing axial force and overturning moment. Compared with the three-roller-row type slewing bearing, bearing capacity of the five-roller-row type slewing bearing is increased by more than twice under the conditions of same slewing centers and the same diameters of the rollers. The slewing bearing is applicable to operation occasions with extremely small bearing radial force and particularly large bearing axial force and overturning moment.

Five-roller-row type slewing bearing

The invention discloses a ball-type slewing bearing with an asymmetric raceway and a processing method thereof; the raceway of the slewing bearing is the asymmetric raceway; the upper part and the lower part of the slewing bearing are asymmetric and the inner ring raceway and the outer ring raceway are asymmetric; the detailed structure parameters of the ball-type slewing bearing are as follows: the ratio of curvature (the curvature radius ratio between the raceway and the steel ball, i.e. R/r) ranges from 1.02 to 1.08, the contact angle alpha has a value range from 55 degrees to 65 degrees and the cross angle beta has a value range from 10 degrees to 20 degrees. According to the detained structure parameters, a numerically controlled lathe is adopted to conduct semi-finishing of the raceway firstly; next, intermediate frequency quenching is conducted on the raceway, with quenching hardness being 57 HRC to 62 HRC; and finally, a specific numerically controlled grinder for the raceway is adopted to shape and grind the asymmetric raceway. The slewing bearing can improve the state of the contact stress between the steel ball and the raceway and increase the carrying capacity by 35 percent.

Ning Hou

Papers

Multi-row ball type slewing bearing and machining method thereof

Five-row pin roller type pivoting support and processing method thereof

Single-row ball type slewing bearing of elliptic roller track and method for making same

Five-roller-row type slewing bearing

Ball-type slewing bearing with asymmetric raceway and processing method thereof