Double-row roller bearing with crossed four-point contact ball tangent spherical rolling body and middle ball

Abstract

The invention relates to a bearing, in particular to a double-row roller bearing with a ball arranged in a crossed four-point contact ball-cut spherical rolling body, which comprises an outer ferrule, a ball-cut spherical rolling body, a double-half inner ferrule, a crossed rolling body retainer and a double-row cylindrical roller, and is characterized in that ball top surfaces, which are extremely easy to generate sliding friction, at two ends of an axial lead of the spherical rolling body are cut off; each ball-cutting-shaped spherical rolling body forms a crossed stress state in a good state of two-point contact, pure rolling and no rotary friction, and the axial clearance of each ball-cutting-shaped spherical rolling body is selected between zero axial clearance and negative axial clearance; the ball-cut spherical rolling bodies are arranged between the double-row rollers in a crisscross manner to independently bear the axial load of the bearing in a manner of replacing the sliding friction between the large ends of the rollers and the retaining shoulders with pure rolling friction, so that the pressure sliding friction between the ends of the double-row rollers and the retaining shoulders is almost zero, and the sliding friction between the large ends of the rollers and the retaining shoulders is greatly reduced; good oil films are formed between the two ends of the roller and the retaining shoulders.

Description

[0001] The present invention relates to a bearing, in particular to a double-row roller bearing with a cross-four-point contact spherical cut spherical rolling body and a centrally placed ball. Background Art

[0002] It is known that the current four-point contact ball bearings have an extremely high speed limit (D215 / d100 ordinary grade speed limit can reach 5600 rpm - SKF-P448-454), even exceeding the speed limit of deep groove ball bearings, angular contact ball bearings and self-aligning ball bearings and all rolling bearings (D215 / d100 four-point contact ball bearings with surface hardened P6 grade speed limit can reach 10000 rpm - refer to SKF data p210).

[0003] However, four-point contact ball bearings can only bear unidirectional axial loads. In practice, it is found that four-point contact ball bearings often experience spin sliding friction and scratches caused by multiple points of contact when subjected to complex torques. Therefore, four-point contact ball bearings in various countries around the world must use a larger axial clearance to prevent spin sliding friction from occurring at any time. As a result, the accuracy and stability of the bearings are greatly limited. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention has developed a double-row roller bearing with a cross-four-point contact spherical cut spherical rolling element and a centrally placed ball, which has significant advantages:

[0005] 1. The spherical surface part of the spherical rolling element of the traditional four-point contact ball bearing, which is extremely prone to spin sliding friction outside the two-point contact, is cut off along the ball top at both ends of the axis to form the dynamic structure of the cross-four-point contact spherical cut spherical bearing, so as to eliminate the rotational sliding friction that is extremely prone to occur when the spherical rolling element rotates at high speed.

[0006] 2. The spherical rolling element is the only dynamic structure that can achieve fine-tuning of the curvature radius of the spherical surface while keeping the diameter unchanged. It can appropriately reduce the curvature radius of the ball while keeping the diameter unchanged to prevent the rotational sliding friction generated when the spherical rolling element rotates at high speed. This is the best solution to increase the bearing's limit rotation speed under the same working conditions.

[0007] 3. Spherical cutting: When the diameter of the ball remains unchanged, the spherical cutting part and the axial hole can significantly reduce the weight of the spherical rolling body, which provides the best solution for increasing the limit rotation speed of the bearing under the same working conditions.

[0008] 4. The spherical rolling element utilizes the rotational fit between the shaft and the small diameter of the axial center hole to greatly reduce the large diameter sliding friction between the rolling element and the cage. The rotational fit between the shaft and the axial center hole makes the axis line and rotational stability of the rolling element more stable.

[0009] 5. Currently, due to the limitation of dynamic structure space, existing cross bearings cannot be equipped with cages. Instead, they can only be equipped with rolling element isolation blocks to maintain the distance gap between the rolling elements. Since the isolation blocks are not subject to radial constraints, during high-speed operation, the isolation blocks will produce strong centrifugal displacement between the arc-shaped contact slopes where the two rows of rollers intersect, causing the friction and friction resistance of the contact surface between each roller and the isolation block to increase exponentially (the centrifugal force increases 3 times for every doubling of the speed). This is one of the important factors that prevent cross roller bearings from running at high speeds.

[0010] The creation of the cross rolling element cage does not have the isolation block, which directly eliminates the defect of the isolation block centrifugal displacement. Therefore, the cross bearing with the cross rolling element cage has a higher operating speed.

[0011] The above special design breaks through the limitation that the center ball of the four-point contact ball bearing can only bear unidirectional axial load under the condition of two-point contact. It can select the axial clearance of the bearing between zero and negative axial clearance. Under the action of the cross-cross cage, each spherical cutting spherical rolling element can form a cross-cross force state under the good state of two-point contact, pure rolling and no rotation friction. It can withstand alternating pure axial loads and combined loads at the same time, forming a true four-point contact pure rolling friction dynamic function. Therefore: the four-point contact ball bearing with cross-cross spherical rolling elements not only has the advantages of high rigidity, pure rolling and bearing combined load of four-point contact ball bearings, but also has the characteristics of low friction, low heat generation, ultra-high speed rotation and long life of ball bearings. It is the best choice for slewing bearings of various joints of high-precision, high-speed equipment or high-precision, high-speed robots.

[0012] The main functions of the cross-cross four-point contact double-row roller bearing with a spherically cut spherical rolling element and a centrally placed ball are:

[0013] (1) The center ball of the cross-shaped four-point contact spherical rolling element has a balanced and stable mechanical effect, just like the fulcrum of a balance and the center plate of a train turntable. It can independently or jointly bear the overturning moment generated by the bearing under the action of complex torque.

[0014] In order to eliminate the occurrence of pressure stress concentration at both ends of the roller and the roller skew caused by the pressure stress difference at both ends of the roller, the double-row rollers can always maintain uniform force on the pressure contact line, maintain a good oil film and maintain a pure rolling friction state.

[0015] (2) The central ball of the cross-cross four-point contact spherical rolling body is used to independently bear the axial load of the bearing in the middle between the double-row rollers by replacing the sliding friction between the big end of the roller and the shoulder with pure rolling friction, so as to eliminate the axial force on the two ends of the double-row rollers on both sides of the central ball, so that the pressure sliding friction between the end of the double-row roller and the shoulder is almost zero, which can directly reduce the friction wear and friction heat caused by sliding friction by 70-90%. It can not only effectively and significantly reduce the sliding drag friction resistance between the big end of the roller and the shoulder and the roller skew caused by it, but also help to form a good lubricating oil film between the end of the roller and the shoulder.

[0016] (3) The center ball of the cross-cross four-point contact spherical rolling element can achieve zero free play or negative free play, with extremely high rotational accuracy and extremely high rigidity, which is 3-4 times stronger than the rigidity of traditional bearings, and can bear combined loads at the same time. In particular, the center ball of the cross-cross four-point contact spherical rolling element can achieve extremely high or very high rotation speed while bearing pure axial load. Therefore: under the action of the center ball of the cross-cross four-point contact spherical rolling element, the axial clearance of the double-row rollers can be minimized, which can effectively improve the rigidity, rotational accuracy, rotational speed and rated load of the bearing, make the double-row rollers more evenly stressed during high-speed rotation, and effectively reduce the friction and heat generation of the bearing as a whole, so as to give full play to the full dynamic advantages of the roller bearing.

[0017] Because: the central ball of the cross-four-point contact spherical rolling element can eliminate or reduce the mutual interference of the double-row rollers in complex rotational torque, which is an important condition for achieving ultra-high-speed operation.

[0018] Therefore: The double-row roller bearing with a cross-four-point contact spherical cut spherical rolling element and a central ball has double-row rollers on both sides of the central ball with good lubrication, low friction, low heat generation, low running resistance, and uniform compressive stress, which has the conditions for ultra-high-speed rotation.

[0019] For example, a dynamic bearing combination consisting of a cross-cross four-point contact spherical cutting spherical rolling element and a double-row roller bearing with a central ball can easily break through the 8000 rpm mark, which is the best choice for high-speed trains to achieve a speed of 800-1000 km / h.

[0020] In particular, the center ball of the cross-cross four-point contact spherical rolling element can achieve zero axial play or negative axial play, and has extremely high rigidity, extremely high rotational accuracy and extremely high impact resistance, and has the characteristics of uniform stress, automatic centering and reset, low heat generation and long life. Therefore, the double-row roller bearing with a center ball of the cross-cross four-point contact spherical rolling element has the characteristics of high speed, heavy load and low friction, and is particularly suitable for high-speed motor vehicle axles, high-end military vehicle axles and slewing bearings of various joints of high-precision robots. It is currently the best choice for slewing bearings of various joints of high-precision robots.

[0021] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0022] A double-row roller bearing with a cross-cross four-point contact spherically cut spherical rolling element and a centrally placed ball comprises an outer ring, a cross-cross rolling element cage, a spherically cut spherical rolling element, two semi-inner rings, and double-row cylindrical rollers. The bearing is characterized in that a circle of cross-cross elliptical spherical roller tracks is provided in the middle of the inner circumference of the outer ring, the curvature radius of the cross-cross elliptical spherical roller track being greater than the radius of the bearing circumferential track, and double-row cylindrical roller tracks are provided on both sides of the cross-cross elliptical spherical roller track.

[0023] The outer ring is provided with a circle of cross-crossed elliptical spherical roller tracks in the middle of its inner circumference. The axial section of the cross-crossed elliptical spherical roller tracks is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the cross-crossed elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element cage sliding grooves is provided in the middle of the inner circumference of the outer ring along the circumferential center line of the cross-crossed elliptical spherical roller tracks. Double rows of cylindrical roller tracks are provided at intervals on both sides of the cross-crossed elliptical spherical roller tracks.

[0024] The pockets of the cross-cross rolling element cage are spherically cut spherical rolling element pocket structures. The spherically cut spherical rolling elements are arranged at 90 degrees along the two sides of the circumferential center line of the cross-cross rolling element cage. A circle of sliding positioning guide rails are respectively arranged along the inner and outer circumferential center lines of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring.

[0025] The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface part that is extremely prone to spin sliding friction at both ends of the spherical rolling body along the axis, and the "spherical cutting spherical rolling body" is arranged in a circle of cross-cross elliptical spherical roller tracks in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the spherical cutting spherical rolling body forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller tracks.

[0026] The double half inner rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner ends of the outer circumferences, and the curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. Cylindrical roller tracks are respectively provided in the middle of the outer circumferences of the double half inner rings, and double rows of cylindrical rollers are respectively provided in the cylindrical sub-tracks provided in the middle of the outer circumferences of the double half inner rings. The double half inner rings are coaxially provided on both sides of the inner circumference of the outer ring, and are respectively combined with a circle of double semi-elliptical spherical roller tracks provided at the inner ends of the outer circumferences and the double rows of cylindrical rollers provided in the cylindrical sub-tracks in the middle of the outer circumference, the center ball of the cross-cross four-point contact spherically cut spherical rolling body provided in the cross-cross elliptical spherical roller track in the middle of the inner circumference of the outer ring and the double rows of cylindrical sub-tracks provided on both sides of the cross-cross elliptical spherical roller track on the inner circumference of the outer ring, to form a double row cylindrical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

[0027] A double-row roller bearing with a cross-cross four-point contact spherically cut spherical rolling element and a centrally placed ball comprises an outer ring, a cross-cross rolling element cage, a spherically cut spherical rolling element, two semi-inner rings, and double-row elliptical spherical rollers. The bearing is characterized in that a circle of cross-cross elliptical spherical roller tracks is provided in the middle of the inner circumference of the outer ring, the curvature radius of the cross-cross elliptical spherical roller track being greater than the radius of the bearing circumferential track, and double-row elliptical spherical roller tracks are provided on both sides of the cross-cross elliptical spherical roller track.

[0028] The outer ring is provided with a circle of cross-crossed elliptical spherical roller tracks in the middle of its inner circumference. The axial section of the cross-crossed elliptical spherical roller tracks is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element retainer sliding grooves is provided in the middle of the inner circumference of the outer ring along the circumferential center line of the cross-crossed elliptical spherical roller tracks. Double rows of elliptical spherical roller tracks are provided at intervals on both sides of the cross-crossed elliptical spherical roller tracks. The curvature radius of the double rows of elliptical spherical roller tracks is greater than the radius of the bearing circumferential track.

[0029] The pockets of the cross-cross rolling element cage are spherically cut spherical rolling element pocket structures. The spherically cut spherical rolling elements are arranged at 90 degrees along the two sides of the circumferential center line of the cross-cross rolling element cage. A circle of sliding positioning guide rails are respectively arranged along the inner and outer circumferential center lines of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring.

[0030] The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface portion that is extremely prone to spin sliding friction along the two ends of the axis of the spherical rolling body, thereby forming a spherical cutting spherical rolling body structure. The spherical cutting spherical rolling body is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the spherical cutting spherical rolling body forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller tracks.

[0031] The curvature radius of the double-row elliptical spherical roller is greater than the radius of the bearing circumferential track.

[0032] The double half inner rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner end of the outer circumference, the curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the bearing circumferential track, and an elliptical spherical roller track is respectively provided in the middle of the outer circumference of the double half inner rings, the curvature radius of the elliptical spherical roller track is greater than the radius of the bearing circumferential track, and double rows of elliptical spherical rollers are respectively provided in the elliptical spherical roller tracks provided in the middle of the outer circumference of the double half inner rings, and the double half inner rings are coaxially provided on both sides of the inner circumference of the outer ring, and A double-row elliptical spherical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body is formed by combining a double-semi-elliptical spherical roller track arranged at the inner end of the outer circumference and a double-row elliptical spherical roller track arranged in the elliptical spherical roller track in the middle of the outer circumference, with a center ball of a cross-cross four-point contact spherically cut spherical rolling body arranged in the cross-cross elliptical spherical roller track in the middle of the inner circumference of the outer ring and double-row elliptical spherical roller tracks arranged on both sides of the cross-cross elliptical spherical roller track on the inner circumference of the outer ring.

[0033] A double-row roller bearing with a cross-cross four-point contact spherically cut spherical rolling element and a centrally placed ball comprises an outer ring, a cross-cross rolling element cage, a spherically cut spherical rolling element, two semi-inner rings, a double-row elliptical spherical roller, and a carbide outer track. The bearing is characterized in that a circle of cross-cross elliptical spherical roller tracks is provided in the middle of the inner circumference of the outer ring, the curvature radius of the cross-cross elliptical spherical roller track being greater than the radius of the bearing circumferential track, and bearing sleeves are provided on both sides of the cross-cross elliptical spherical roller track.

[0034] The outer ring is provided with a circle of cross-crossed elliptical spherical roller tracks in the middle of its inner circumference. The axial section of the cross-crossed elliptical spherical roller tracks is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element cage sliding grooves is provided in the middle of the inner circumference of the outer ring along the circumferential center line of the cross-crossed elliptical spherical roller tracks. Bearing sleeves are respectively provided at intervals on both sides of the cross-crossed elliptical spherical roller tracks.

[0035] The pockets of the cross-cross rolling element cage are "spherically cut spherical rolling elements" with a "spherically cut spherical rolling element" structure. The "spherically cut spherical rolling elements" are arranged at 90-degree intervals on both sides of the circumferential centerline of the cross-cross rolling element cage. A circle of sliding positioning guide rails is respectively arranged along the inner and outer circumferential centerlines of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring.

[0036] The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface portion that is extremely prone to spin sliding friction along the two ends of the axis of the spherical rolling body, thereby forming a spherical cutting spherical rolling body structure. The spherical cutting spherical rolling body is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the spherical cutting spherical rolling body forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller tracks.

[0037] The carbide outer track is a sleeve structure with an elliptical spherical roller track arranged on the inner circumference. The curvature radius of the elliptical spherical roller track is greater than the radius of the bearing circumferential track.

[0038] The curvature radius of the double-row elliptical spherical roller is greater than the radius of the bearing circumferential track.

[0039] The double half inner rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner end of the outer circumference, the curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the bearing circumferential track, and an elliptical spherical roller track is respectively provided in the middle of the outer circumference of the double half inner rings, the curvature radius of the elliptical spherical roller track is greater than the radius of the bearing circumferential track, and double rows of elliptical spherical rollers are respectively provided in the elliptical spherical roller tracks provided in the middle of the outer circumference of the double half inner rings. The elliptical spherical roller tracks of the double half inner rings are respectively combined by double rows of elliptical spherical rollers and the elliptical spherical roller tracks provided on the inner circumference of the carbide outer track. An elliptical spherical roller bearing structure is formed, with two half inner rings coaxially arranged on both sides of the inner circumference of the outer ring, and a circle of double half elliptical spherical roller tracks arranged at the inner end of the outer circumference and the outer circumference of the carbide track of the elliptical spherical roller bearing arranged on the outer circumference are respectively combined with the center ball of the four-point contact spherically cut spherical rolling body cross-arranged in the cross-cross elliptical spherical roller track in the middle of the inner circumference of the outer ring and the bearing sleeves arranged on both sides of the cross-cross elliptical spherical roller track on the inner circumference of the outer ring, forming a double-row elliptical spherical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

[0040] A double-row roller bearing with a cross-cross four-point contact spherically cut spherical rolling element and a centrally placed ball comprises an outer ring, a cross-cross rolling element cage, a spherically cut spherical rolling element, two semi-inner rings, and double-row asymmetric elliptical spherical rollers. The bearing is characterized in that a circle of cross-cross elliptical spherical roller tracks is provided in the middle of the inner circumference of the outer ring, the curvature radius of the cross-cross elliptical spherical roller track being greater than the radius of the bearing circumferential track, and double-row spherical roller tracks are provided on both sides of the cross-cross elliptical spherical roller track.

[0041] The outer ring is provided with a circle of cross-crossed elliptical spherical roller tracks in the middle of its inner circumference. The axial section of the cross-crossed elliptical spherical roller tracks is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the cross-crossed elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element cage sliding grooves is provided in the middle of the inner circumference of the outer ring along the circumferential center line of the cross-crossed elliptical spherical roller tracks. Double rows of spherical roller tracks are provided at intervals on both sides of the cross-crossed elliptical spherical roller tracks.

[0042] The pockets of the cross-cross rolling element cage are "spherically cut spherical rolling elements" with a "spherically cut spherical rolling element" structure. The "spherically cut spherical rolling elements" are arranged at 90-degree intervals on both sides of the circumferential centerline of the cross-cross rolling element cage. A circle of sliding positioning guide rails is respectively arranged along the inner and outer circumferential centerlines of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring.

[0043] The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface part that is extremely prone to spin sliding friction at both ends of the spherical rolling body along the axis, and setting the spherical cutting spherical rolling body in a circle of cross-cross elliptical spherical roller track in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the "spherical cutting spherical rolling body" forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller track.

[0044] The curvature radius of the double-row asymmetric elliptical spherical roller is greater than the radius of the bearing's circumferential track.

[0045] The double half inner rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner end of the outer circumference, and the curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. The outer circumferences of the double half inner rings are respectively provided with reverse elliptical spherical roller tracks, and the curvature radius of the reverse elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. After the double half inner rings are combined, reverse elliptical spherical roller tracks with the same center and radius are formed. Double rows of asymmetric elliptical spherical rollers are respectively provided in the reverse elliptical spherical roller tracks provided on the outer circumferences of the double half inner rings. The rings are coaxially arranged on both sides of the inner circumference of the outer ring, and are respectively formed through a circle of double semi-elliptical spherical roller tracks arranged at the inner end of the outer circumference, a double row of asymmetric elliptical spherical rollers arranged in the reverse elliptical spherical roller tracks of the outer circumference, a combination of a center ball of a four-point contact spherically cut spherical rolling body arranged in a cross-cross elliptical spherical roller track in the middle of the inner circumference of the outer ring, and a double row of spherical roller tracks arranged on both sides of the cross-cross elliptical spherical roller track on the inner circumference of the outer ring, to form a double row spherical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

[0046] A double-row roller bearing with a cross-cross four-point contact spherically cut spherical rolling element and a centrally placed ball comprises an outer ring, a cross-cross rolling element cage, spherically cut spherical rolling elements, two semi-inner rings, and double-row asymmetric elliptical spherical rollers. The bearing is characterized in that a circle of cross-cross elliptical spherical roller tracks is provided in the middle of the inner circumference of the outer ring, the curvature radius of the cross-cross elliptical spherical roller track being greater than the radius of the bearing circumferential track, spherically cut spherical rolling elements are cross-arranged within the cross-cross elliptical spherical roller track, and double-row spherical roller tracks are provided on both sides of the cross-cross elliptical spherical roller track.

[0047] The outer ring is provided with a circle of cross-crossed elliptical spherical roller tracks in the middle of its inner circumference. The axial section of the cross-crossed elliptical spherical roller tracks is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the cross-crossed elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element cage sliding grooves is provided in the middle of the inner circumference of the outer ring along the circumferential center line of the cross-crossed elliptical spherical roller tracks. Double rows of spherical roller tracks are provided at intervals on both sides of the cross-crossed elliptical spherical roller tracks.

[0048] The pockets of the cross-cross rolling element cage are "spherically cut spherical rolling elements" with a "spherically cut spherical rolling element" structure. The "spherically cut spherical rolling elements" are arranged at 90-degree intervals on both sides of the circumferential centerline of the cross-cross rolling element cage. A circle of sliding positioning guide rails is respectively arranged along the inner and outer circumferential centerlines of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring.

[0049] The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface portion that is extremely prone to spin sliding friction along the two ends of the axis of the spherical rolling body, thereby forming a spherical cutting spherical rolling body structure. The spherical cutting spherical rolling body is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the spherical cutting spherical rolling body forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller tracks.

[0050] The curvature radius of the double-row asymmetric elliptical spherical roller is greater than the radius of the bearing's circumferential track.

[0051] The double half inner rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner end of the outer circumference, and the curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. The outer circumferences of the double half inner rings are respectively provided with reverse elliptical spherical roller tracks, and the curvature radius of the reverse elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of spherical roller shoulders is respectively provided at the inner end of the reverse elliptical spherical roller tracks on the outer circumferences of the double half inner rings. After the double half inner rings are combined, reverse elliptical spherical roller tracks with the same center and radius are formed. Double rows of asymmetric elliptical spherical rollers are respectively provided on the outer circumference of the inner rings. In the reverse elliptical spherical roller track, the double half inner rings are coaxially arranged on both sides of the inner circumference of the outer ring, and a circle of double half elliptical spherical roller tracks arranged at the inner end of the outer circumference and the double rows of asymmetric elliptical spherical rollers arranged in the reverse elliptical spherical roller tracks on the outer circumference are respectively combined with the center ball of the four-point contact spherically cut spherical rolling body cross-arranged in the cross-cross elliptical spherical roller track in the middle of the inner circumference of the outer ring and the double rows of spherical roller tracks arranged on both sides of the cross-cross elliptical spherical roller track on the inner circumference of the outer ring to form a double row spherical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

[0052] A double-row roller bearing with a cross-cross four-point contact spherically cut spherical rolling element and a centrally placed ball comprises an inner ring, a cross-cross rolling element cage, spherically cut spherical rolling elements, two half-outer rings, and double-row asymmetric elliptical spherical rollers. The bearing is characterized in that a circle of cross-cross elliptical spherical roller tracks is provided in the middle of the outer circumference of the inner ring, the curvature radius of the cross-cross elliptical spherical roller track being greater than the radius of the bearing circumferential track, spherically cut spherical rolling elements are cross-arranged within the cross-cross elliptical spherical roller track, and double-row spherical roller tracks are provided on both sides of the cross-cross elliptical spherical roller track.

[0053] The curvature radius of the double-row asymmetric elliptical spherical roller is greater than the radius of the bearing's circumferential track.

[0054] The inner ring is provided with a circle of cross-crossed elliptical spherical roller track in the middle of its outer circumference. The axial section of the cross-crossed elliptical spherical roller track is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the cross-crossed elliptical spherical roller track is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element retainer sliding groove is provided in the middle of the outer circumference of the inner ring along the circumferential center line of the cross-crossed elliptical spherical roller track. Double-row spherical roller tracks are provided at intervals on both sides of the cross-crossed elliptical spherical roller track. Double-row asymmetric elliptical spherical rollers are respectively provided in the double-row spherical roller tracks provided on both sides of the cross-crossed elliptical spherical roller track in the middle of the outer circumference of the inner ring.

[0055] The pockets of the cross-cross rolling element cage are spherically cut spherical rolling element pocket structures. The spherically cut spherical rolling elements are arranged at 90 degrees along the center line of the cross-cross rolling element cage. A circle of sliding positioning guide rails are respectively arranged along the center line of the inner and outer circumferences of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the outer circumference of the inner ring.

[0056] The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface part that is extremely prone to spin sliding friction along the two ends of the axis of the spherical rolling body, thereby forming a spherical cutting spherical rolling body structure. The spherical cutting spherical rolling body is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the outer circumference of the inner ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the spherical cutting spherical rolling body forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller tracks.

[0057] The double half outer rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner end of the inner circumference. The curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. The inner circumference of the double half outer rings is respectively provided with elliptical spherical roller tracks with the same center and radius. After the double half outer rings are combined, an elliptical spherical roller track with the same center and radius is formed. The curvature radius of the elliptical spherical roller track is greater than the radius of the bearing circumferential track. The double half outer rings are coaxially arranged on both sides of the outer circumference of the inner ring. A double-row spherical roller bearing with a center ball of a cross-crossed four-point contact spherically cut spherical rolling body is formed by combining a double-semi-elliptical rolling body track arranged at the inner end of the inner circumference, an elliptical spherical roller track arranged on the inner circumference, a four-point contact spherically cut spherical rolling body with a center ball arranged in a cross-crossed elliptical spherical roller track in the middle of the outer circumference of the inner ring, and double-row asymmetric elliptical spherical rollers arranged in double-row spherical roller tracks on both sides of the cross-crossed elliptical spherical roller track on the outer circumference of the inner ring.

[0058] A double-row roller bearing with a cross-cross four-point contact spherically cut spherical rolling element and a centrally placed ball comprises an inner ring, a cross-cross rolling element cage, spherically cut spherical rolling elements, two half-outer rings, and double-row asymmetric elliptical spherical rollers. The bearing is characterized in that a circle of cross-cross elliptical spherical roller tracks is provided in the middle of the outer circumference of the inner ring, the curvature radius of the cross-cross elliptical spherical roller track being greater than the radius of the bearing circumferential track, spherically cut spherical rolling elements are cross-arranged within the cross-cross elliptical spherical roller track, and double-row spherical roller tracks are provided on both sides of the cross-cross elliptical spherical roller track.

[0059] The inner ring is provided with a circle of cross-crossed elliptical spherical roller tracks in the middle of its outer circumference. The axial section of the cross-crossed elliptical spherical roller tracks is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the cross-crossed elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element cage sliding grooves is provided in the middle of the outer circumference of the inner ring along the circumferential center line of the cross-crossed elliptical spherical roller tracks. Double rows of spherical roller tracks are provided at intervals on both sides of the cross-crossed elliptical spherical roller tracks.

[0060] The pockets of the cross-cross rolling element cage are "spherically cut spherical rolling elements" with a "spherically cut spherical rolling element" structure. The "spherically cut spherical rolling elements" are arranged at 90 degrees along the center line of the cross-cross rolling element cage. A circle of sliding positioning guide rails is arranged along the center line of the inner and outer circumferences of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the outer circumference of the inner ring.

[0061] The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface part that is extremely prone to spin sliding friction along the two ends of the axis of the spherical rolling body, thereby forming a spherical cutting spherical rolling body structure. The spherical cutting spherical rolling body is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the outer circumference of the inner ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the spherical cutting spherical rolling body forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller tracks.

[0062] The curvature radius of the double-row asymmetric elliptical spherical roller is greater than the radius of the bearing's circumferential track.

[0063] The double half outer rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner end of the inner circumference, and the curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. The inner circumference of the double half outer rings is respectively provided with an elliptical spherical roller track with the same radius as the circle center, and a circle of spherical roller shoulders is respectively provided at the inner end of the elliptical spherical roller track on the inner circumference of the double half outer rings. After the double half outer rings are combined, an elliptical spherical roller track with the same center and radius is formed. The curvature radius of the elliptical spherical roller track is greater than the radius of the bearing circumferential track. Double rows of asymmetric elliptical spherical rollers are respectively provided on the inner circumference of the double half outer rings. In the separately arranged elliptical spherical roller track, the double half outer rings are coaxially arranged on both sides of the outer circumference of the inner ring, and through a circle of double half elliptical rolling body tracks arranged at the inner end of the inner circumference and the double rows of asymmetric elliptical spherical rollers respectively arranged in the inner circumference elliptical spherical roller track, the center ball of the four-point contact spherically cut spherical rolling body cross-arranged in the cross-cross elliptical spherical roller track in the middle of the outer circumference of the inner ring, and the double rows of spherical roller tracks arranged on both sides of the cross-cross elliptical spherical roller track on the outer circumference of the inner ring, a double row spherical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body is formed.

[0064] A double-row roller bearing with a cross-cross four-point contact spherically cut spherical rolling element and a centrally placed ball comprises an outer ring, a cross-cross rolling element retainer, a spherically cut spherical rolling element, two semi-inner rings, and a double-row spherical rolling element. The bearing is characterized in that a circle of cross-cross elliptical spherical roller tracks is provided in the middle of the inner circumference of the outer ring, the curvature radius of the cross-cross elliptical spherical roller track being greater than the radius of the bearing circumferential track, spherically cut spherical rolling elements are cross-arranged within the cross-cross elliptical spherical roller track, and double-row angular contact spherical rolling element tracks are provided on both sides of the cross-cross elliptical spherical roller track.

[0065] The outer ring is provided with a circle of cross-crossed elliptical spherical roller tracks in the middle of its inner circumference. The axial section of the cross-crossed elliptical spherical roller tracks is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the cross-crossed elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element cage sliding grooves is provided in the middle of the inner circumference of the outer ring along the circumferential center line of the cross-crossed elliptical spherical roller tracks. Double-row angular contact spherical rolling tracks are provided at intervals on both sides of the cross-crossed elliptical spherical roller tracks.

[0066] The pockets of the cross-cross rolling element cage are "spherically cut spherical rolling elements" with a "spherically cut spherical rolling element" structure. The "spherically cut spherical rolling elements" are arranged at 90-degree intervals on both sides of the circumferential centerline of the cross-cross rolling element cage. A circle of sliding positioning guide rails is respectively arranged along the inner and outer circumferential centerlines of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring.

[0067] The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface portion that is extremely prone to spin sliding friction along the two ends of the axis of the spherical rolling body, thereby forming a spherical cutting spherical rolling body structure. The spherical cutting spherical rolling body is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the spherical cutting spherical rolling body forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller tracks.

[0068] The double half inner rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner ends of the outer circumferences, the curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the elliptical spherical roller circumferential tracks, and angular contact spherical rolling body tracks are respectively provided in the middle of the outer circumferences of the double half inner rings, and the double rows of spherical rolling bodies are respectively provided in the angular contact spherical rolling body tracks provided in the middle of the outer circumferences of the double half inner rings. The double half inner rings are coaxially provided on both sides of the inner circumference of the outer ring, and are respectively combined with the center ball of the four-point contact spherically cut spherical rolling body cross-arranged in the cross-cross elliptical spherical roller track in the middle of the inner circumference of the outer ring and the double rows of angular contact spherical rolling body tracks provided on both sides of the cross-cross elliptical spherical roller track on the inner circumference of the outer ring to form a double row angular contact ball bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

[0069] A double-row roller bearing with a cross-four-point contact spherical rolling element and a central ball is characterized in that: the spherical rolling element is provided with an axial center hole along the axis of the spherical rolling element.

[0070] The spherical rolling element pocket of the cross rolling element retainer is a pocket structure with an axial pin hole. Axial pin holes are set at the coaxial center lines on both sides of the pocket along the axis of the spherical rolling element. The spherical rolling element and the cross rolling element retainer are connected by an axial pin through the axial hole of the spherical rolling element and the axial pin holes set at the coaxial center lines on both sides of the spherical rolling element pocket of the cross rolling element retainer, forming rotational positioning.

[0071] The beneficial effect of the double-row roller bearing with a cross-four-point contact spherical cut spherical rolling element and a center ball is as follows: the spherical surface parts of the center ball that are extremely prone to spin sliding friction outside the two-point contact of the center ball are cut off along the ball tops at both ends of the axis to form a cross-four-point contact spherical cut spherical rolling element with a center ball.

[0072] The creation of the cross rolling element cage eliminates the need for isolation blocks, directly eliminating the defect of centrifugal displacement of the isolation blocks. Therefore, the cross bearing with the cross rolling element cage has a higher operating speed. The spherical rolling elements form a cross four-point contact ball bearing structure under the action of the cross cage.

[0073] The special design breaks through the limitation that the center ball of the four-point contact ball rolling element can only bear unidirectional axial load under the condition of two-point contact. It can make the axial clearance of the bearing choose between zero or negative axial clearance. Under the action of the cross-cross cage, each center ball can form a cross-cross force state under the good state of two-point contact, pure rolling and no rotation friction, and at the same time bear alternating pure axial load and combined load, forming the dynamic function of true four-point contact pure rolling friction. Therefore: the center ball of the cross-cross four-point contact ball cut spherical rolling element not only has the advantages of high rigidity, pure rolling and bearing combined load of four-point contact ball bearings, but also has the advantages of low friction, low heat generation and ultra-high The product has the characteristics of high-speed rotation and long service life. The center ball of the cross-four-point contact spherical cutting spherical rolling element is set between the double-row rollers to independently bear the axial load of the bearing, so that the double-row rollers on both sides of the center ball bear almost no axial load, and can ensure that the sliding friction caused by the axial load between the double-row rollers and the ribs is not carried, effectively ensuring the pure rolling friction of the double-row rollers and the formation of oil film on the roller end faces, so that the bearing has good dynamic performance of high speed, heavy load and low friction. It has the characteristics of high speed, heavy load and low friction, and is particularly suitable for slewing bearings of high-speed motor vehicle axles, high-end military vehicle axles and high-precision robot joints. It is currently the best choice for slewing bearings of high-precision robot joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Figure 1 This is a structural schematic diagram of the present invention in which an outer ring is provided with a circle of cross-elliptical spherical roller tracks in the middle of its inner circumference, and double rows of cylindrical roller tracks are provided at intervals on both sides of the cross-elliptical rolling body track.

[0075] Figure 2 This is a structural schematic diagram of the present invention in which an outer ring is provided with a circle of cross-elliptical spherical roller tracks in the middle of its inner circumference, and double rows of elliptical spherical roller tracks are provided at intervals on both sides of the cross-elliptical rolling body track.

[0076] Figure 3 This is a structural schematic diagram of the present invention in which the outer ring is provided with a circle of cross-elliptical spherical roller tracks in the middle of its inner circumference, and bearing sleeves and cemented carbide double-row elliptical spherical roller outer tracks are provided at intervals on both sides of the cross-elliptical rolling body track.

[0077] Figure 4This is a structural schematic diagram of the present invention in which the outer ring is provided with a circle of cross-elliptical spherical roller tracks in the middle of its inner circumference, double rows of spherical roller tracks are provided at intervals on both sides of the cross-elliptical rolling body track, the double half inner rings are respectively provided with a circle of double half-elliptical rolling body tracks at the inner end of the outer circumference, and the outer circumferences of the double half inner rings are respectively provided with opposite spherical roller common tracks.

[0078] Figure 5 This is a structural diagram of the present invention in which the outer ring is provided with a circle of cross-elliptical spherical roller track in the middle of its inner circumference, double rows of spherical roller tracks are provided at intervals on both sides of the cross-elliptical rolling body track, the double half inner rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner ends of the outer circumferences, the outer circumferences of the double half inner rings are respectively provided with opposite spherical roller common tracks, and a circle of spherical roller shoulders are respectively provided at the inner ends of the opposite spherical roller common tracks.

[0079] Figure 6 The present invention is a schematic structural diagram of an inner ring having a cross-shaped elliptical spherical roller track in the middle of its outer circumference, a double row of spherical roller tracks at intervals on both sides of the cross-shaped elliptical spherical roller track, a double half-elliptical spherical roller track at the inner end of the inner circumference of the double half-outer ring, and an elliptical spherical roller common track on the inner circumference of the double half-outer ring.

[0080] Figure 7 A schematic structural diagram of the present invention is that the inner ring is provided with a circle of cross-cross elliptical spherical roller track in the middle of its outer circumference, double rows of spherical roller tracks are provided at intervals on both sides of the cross-cross elliptical spherical roller track, the double half-outer rings are respectively provided with a circle of double half-elliptical spherical roller tracks at the inner ends of the inner circumference, the inner circumferences of the double half-outer rings are respectively provided with elliptical spherical roller common tracks, and a circle of spherical roller shoulders are respectively provided at the inner ends of the elliptical spherical roller common tracks.

[0081] Figure 8 This is a structural schematic diagram of the present invention in which an outer ring is provided with a circle of cross-elliptical rolling body tracks in the middle of its inner circumference, and double rows of angular contact spherical rolling body tracks are provided at intervals on both sides of the cross-elliptical rolling body tracks.

[0082] Figure 9 This is a structural schematic diagram of a spherical rolling body arranged in a cross-cross elliptical spherical roller track in the middle of the inner circumference of the outer ring of the present invention, in which an axial hole is provided along the axial center line, and its cross-cross rolling body retainer is provided with axial pin holes along the axial center line of the spherical rolling body on both sides of the spherical cut spherical rolling body pocket, and double-row angular contact spherical rolling body tracks are provided at intervals on both sides of the cross-cross elliptical rolling body track.

[0083] Figure 10It is a structural schematic diagram of the cross cage of the present invention.

[0084] Figure 11 It is a schematic structural diagram of a cross cage in which a spherically cut spherical rolling element is arranged in the present invention.

[0085] Figure 12 This is a schematic diagram of the structure of the spherically cut spherical rolling element of the present invention.

[0086] Figure 13 This is a schematic diagram of the structure of a spherical rolling body with a spherical cut shape and an axial hole provided in the present invention.

[0087] Figure 14 This is a schematic structural diagram of the invention in which the cross cage pockets are provided with axis pin holes along the axis of the spherical rolling body.

[0088] Figure 15 This is a structural schematic diagram of the invention in which the cross cage pockets are provided with an axial pin hole along the axis of the spherically cut spherical rolling body, and are combined with the spherically cut spherical rolling body provided with the axial hole.

[0089] Figure 16 Schematic diagram of the cross-elliptical spherical roller track structure of the present invention (in the figure: R1 is the radius of the bearing circumferential track, and R2 is the curvature radius of the bearing track).

[0090] Figure 17 Schematic diagram of the curvature radius of the elliptical spherical roller track of the present invention being greater than the radius of the bearing circumferential track

[0091] In the figure: 1, outer ring, 2, cross rolling element cage, 3, spherical cut spherical rolling element, 4, double semi-inner ring, 5, double row cylindrical roller, 1-1, cross elliptical spherical roller track, 6, cross rolling element cage sliding groove, 7, double row cylindrical roller track, 2-1, spherical cut spherical rolling element pocket, 2-2, sliding positioning guide, 8, double semi-elliptical spherical roller track, 9, cylindrical roller track, 10, double row elliptical spherical roller, 11, double row elliptical spherical roller track, 1 2. Elliptical spherical roller track, 13. Carbide outer track, 14. Bearing sleeve, 15. Double row asymmetric elliptical spherical roller, 16. Double row spherical roller track, 17. Reverse elliptical spherical roller track, 18. Spherical roller shoulder, 19. Inner ring, 20. Double half outer ring, 21. Elliptical spherical roller track, 22. Double row spherical rolling elements, double row angular contact spherical rolling element track 23, 24. Angular contact spherical rolling element track, 25. Axis pin hole, 26. Axis hole, 27. Axis pin. DETAILED DESCRIPTION

[0092] The present invention will be further described in detail below with reference to specific embodiments, but the present invention is not limited to the specific embodiments.

[0093] Example 1:

[0094] like Figure 1 The double-row roller bearing with a cross-cross four-point contact spherical cut spherical rolling element and a central ball shown in the figure comprises: an outer ring 1, a cross-cross rolling element cage 2, a spherical cut spherical rolling element 3, a double-half inner ring 4 and a double-row cylindrical roller 5.

[0095] A circle of cross-cross elliptical spherical roller track 1-1 is set in the middle of the inner circumference of the outer ring 1. The axial section of the cross-cross elliptical spherical roller track 1-1 is a cross-crossed two groups of elliptical spherical roller track structures. The curvature radius of the elliptical spherical roller track 1-1 is greater than the radius of the bearing circumferential track. A circle of cross-cross rolling element cage sliding groove 6 is set in the middle of the inner circumference of the outer ring 1 along the circumferential center line of the cross-cross elliptical spherical roller track 1-1. Double-row cylindrical roller tracks 7 are set at intervals on both sides of the cross-cross elliptical spherical roller track 1-1.

[0096] The pockets of the cross-cross rolling element cage 2 are "spherically cut spherical rolling element" pockets 2-1. The spherically cut spherical rolling elements are arranged at 90-degree intervals on both sides of the circumferential centerline of the cross-cross rolling element cage 2. A circle of sliding positioning guide rails 2-2 are respectively arranged along the inner and outer circumferential centerlines of the cross-cross rolling element cage 2. The cross-cross rolling element cage 2 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the inner circumference of the outer ring 1.

[0097] The spherical rolling element 3 is formed by cutting off the top of the spherical surface portion of the spherical rolling element along the axis at both ends of the spherical rolling element, which is very prone to spin sliding friction. The spherical rolling element 3 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the inner circumference of the outer ring 1. The spherical rolling element 3 passes through the pockets of the cross-cross rolling element retainer 3 so that the spherical rolling element forms a cross-cross four-point contact spherical rolling element center ball structure in the cross-cross elliptical spherical roller track 1-1.

[0098] The double half inner ring 4 is provided with a circle of double semi-elliptical spherical roller tracks 8 at the inner end of the outer circumference. The curvature radius of the double semi-elliptical spherical roller tracks 8 is greater than the radius of the bearing circumference track. A cylindrical roller track 9 is provided in the middle of the outer circumference of the double half inner ring 4. The double row of cylindrical rollers 5 are respectively provided in the cylindrical tracks 9 provided in the middle of the outer circumference of the double half inner ring 4. The double half inner ring 4 is coaxially provided on both sides of the inner circumference of the outer ring 1 and passes through a circle provided at the inner end of the outer circumference. The double-row cylindrical rollers 5 arranged in the double semi-elliptical spherical roller tracks 8 and the cylindrical sub-track 9 in the middle of the outer circumference are respectively combined with the center ball of the cross-cross four-point contact spherically cut spherical rolling body 3 arranged in the cross-cross elliptical spherical roller track 1-1 in the middle of the inner circumference of the outer ring 1 and the double-row cylindrical sub-tracks 7 arranged on both sides of the cross-cross elliptical spherical roller track 1-1 on the inner circumference of the outer ring 1, forming a double-row cylindrical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

[0099] Example 2:

[0100] like Figure 2 The double-row roller bearing with a cross-cross four-point contact spherical cut spherical rolling element and a central ball shown in the figure comprises: an outer ring 1, a cross-cross rolling element retainer 2, a spherical cut spherical rolling element 3, a double-half inner ring 4 and a double-row elliptical spherical roller 10.

[0101] A circle of cross-cross elliptical spherical roller track 1-1 is set in the middle of the inner circumference of the outer ring 1. The axial section of the cross-cross elliptical spherical roller track 1-1 is a cross-crossed two groups of elliptical spherical roller track structures. The curvature radius of the elliptical spherical roller track 1-1 is greater than the radius of the bearing circumferential track. A circle of cross-cross rolling element cage sliding groove 6 is set in the middle of the inner circumference of the outer ring 1 along the circumferential center line of the cross-cross elliptical spherical roller track 1-1. Double-row elliptical spherical roller tracks 11 are set at intervals on both sides of the cross-cross elliptical spherical roller track 1-1.

[0102] The pockets of the cross-cross rolling element cage 2 are "spherically cut spherical rolling element" pockets 2-1. The spherically cut spherical rolling elements are arranged at 90-degree intervals on both sides of the circumferential centerline of the cross-cross rolling element cage 2. A circle of sliding positioning guide rails 2-2 are respectively arranged along the inner and outer circumferential centerlines of the cross-cross rolling element cage 2. The cross-cross rolling element cage 2 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the inner circumference of the outer ring 1.

[0103] The spherical rolling element 3 is formed by cutting off the top of the spherical surface portion of the spherical rolling element along the axis at both ends of the spherical rolling element, which is very prone to spin sliding friction. The spherical rolling element 3 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the inner circumference of the outer ring 1. The spherical rolling element 3 passes through the pockets of the cross-cross rolling element retainer 3 so that the spherical rolling element forms a cross-cross four-point contact spherical rolling element center ball structure in the cross-cross elliptical spherical roller track 1-1.

[0104] The double half inner ring 4 is provided with a circle of double semi-elliptical spherical roller tracks 8 at the inner end of the outer circumference. The curvature radius of the double semi-elliptical spherical roller tracks 8 is greater than the radius of the bearing circumference track. Elliptical spherical roller tracks 12 are provided in the middle of the outer circumference of the double half inner ring 4. Double rows of elliptical spherical rollers 10 are respectively provided in the elliptical spherical roller tracks 12 provided in the middle of the outer circumference of the double half inner ring 4. The double half inner ring 4 is coaxially provided on both sides of the inner circumference of the outer ring 1 and passes through a circle of double semi-elliptical spherical roller tracks 8 provided at the inner end of the outer circumference. The elliptical spherical roller track 8 and the double row elliptical spherical rollers 10 arranged in the elliptical spherical roller track 12 in the middle of the outer circumference are respectively combined with the center ball of the cross-cross four-point contact spherically cut spherical rolling body 3 set in the cross-cross elliptical spherical roller track 1-1 in the middle of the inner circumference of the outer ring 1 and the double row elliptical spherical roller tracks 11 set on both sides of the cross-cross elliptical spherical roller track 1-1 on the inner circumference of the outer ring 1, forming a double row elliptical spherical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

[0105] Example 3:

[0106] like Figure 3 The double-row roller bearing with a cross-cross four-point contact spherical cut spherical rolling element and a central ball shown in the figure comprises: an outer ring 1, a cross-cross rolling element cage 2, a spherical cut spherical rolling element 3, a double-half inner ring 4, a double-row elliptical spherical roller 10 and a cemented carbide outer track 13.

[0107] A circle of cross-cross elliptical spherical roller track 1-1 is set in the middle of the inner circumference of the outer ring 1. The axial section of the cross-cross elliptical spherical roller track 1-1 is a cross-crossed two groups of elliptical spherical roller track structures. The curvature radius of the elliptical spherical roller track 1-1 is greater than the radius of the bearing circumferential track. A circle of cross-cross rolling element cage sliding groove 6 is set in the middle of the inner circumference of the outer ring 1 along the circumferential center line of the cross-cross elliptical spherical roller track 1-1. Bearing sleeves 14 are respectively set at intervals on both sides of the cross-cross elliptical spherical roller track 1-1.

[0108] The pockets of the cross-cross rolling element cage 2 are spherically cut spherical rolling element pockets 2-1. The spherically cut spherical rolling elements are arranged at 90-degree intervals on both sides of the circumferential centerline of the cross-cross rolling element cage 2. A circle of sliding positioning guide rails 2-2 are respectively arranged along the inner and outer circumferential centerlines of the cross-cross rolling element cage 2. The cross-cross rolling element cage 2 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the inner circumference of the outer ring 1.

[0109] The spherical rolling element 3 is formed by cutting off the top of the spherical surface portion of the spherical rolling element along the axis, which is extremely prone to spin sliding friction, to form a spherical rolling element 3 structure. The spherical rolling element 3 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the inner circumference of the outer ring 1. The spherical rolling element 3 passes through the pockets of the cross-cross rolling element retainer 3 so that the spherical rolling element forms a cross-cross four-point contact spherical rolling element center ball structure in the cross-cross elliptical spherical roller track 1-1. The carbide outer track 13 is a sleeve structure with a circular roller track 12 arranged on the inner circumference.

[0110] The double half inner ring 4 is respectively provided with a circle of double semi-elliptical spherical roller tracks 8 at the inner end of the outer circumference. The curvature radius of the double semi-elliptical spherical roller tracks 8 is greater than the radius of the bearing circumferential track. The elliptical spherical roller tracks 12 are respectively provided in the middle of the outer circumference of the double half inner ring 4. The double row of elliptical spherical rollers 10 are respectively provided in the elliptical spherical roller tracks 12 provided in the middle of the outer circumference of the double half inner ring 4. The circular roller tracks of the double half inner ring 4 are respectively combined by the double row of elliptical spherical rollers 10 and the elliptical spherical roller tracks provided on the inner circumference of the carbide outer track 13 to form an elliptical spherical roller bearing structure. The double half inner ring The ring 4 is coaxially arranged on both sides of the inner circumference of the outer ring 1, and is respectively combined with the center ball of the four-point contact spherically cut spherical rolling body 3 cross-arranged in the cross-cross elliptical spherical roller track 1-1 in the middle of the inner circumference of the outer ring 1 through a circle of double semi-elliptical spherical roller tracks 8 arranged at the inner end of the outer circumference and the circumference of the carbide outer track 13 of the elliptical spherical roller bearing arranged on the outer circumference, and the bearing sleeves 14 arranged on both sides of the cross-cross elliptical spherical roller track 1-1 in the middle of the inner circumference of the outer ring 1, to form a double-row elliptical spherical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

[0111] Example 4:

[0112] like Figure 4 The double-row roller bearing with a cross-cross four-point contact spherical cut spherical rolling element and a central ball shown in the figure comprises: an outer ring 1, a cross-cross rolling element cage 2, a spherical cut spherical rolling element 3, a double-half inner ring 4 and a double-row asymmetric elliptical spherical roller 15.

[0113] A circle of cross-cross elliptical spherical roller track 1-1 is set in the middle of the inner circumference of the outer ring 1. The axial section of the cross-cross elliptical spherical roller track 1-1 is a cross-crossed two groups of elliptical spherical roller track structures. The curvature radius of the cross-cross elliptical spherical roller track 1-1 is greater than the radius of the bearing circumferential track. A circle of cross-cross rolling element cage sliding groove 6 is set in the middle of the inner circumference of the outer ring 1 along the circumferential center line of the cross-cross elliptical spherical roller track 1-1. Double-row spherical roller tracks 16 are set at intervals on both sides of the cross-cross elliptical spherical roller track 1-1.

[0114] The pockets of the cross-cross rolling element cage 2 are spherically cut spherical rolling element pockets 2-1. The spherically cut spherical rolling elements 3 are arranged at 90 degrees along the center line of the cross-cross rolling element cage 2. A circle of sliding positioning guide rails 2-2 are respectively arranged along the inner and outer circumferential center lines of the cross-cross rolling element cage 2. The cross-cross rolling element cage 2 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the inner circumference of the outer ring 1.

[0115] The spherical rolling element 3 is formed by cutting off the top of the spherical surface portion of the spherical rolling element along the axis at both ends of the spherical rolling element, which is very prone to spin sliding friction. The spherical rolling element 3 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the inner circumference of the outer ring 1. The spherical rolling element 3 passes through the pockets of the cross-cross rolling element retainer 3 so that the spherical rolling element forms a cross-cross four-point contact spherical rolling element center ball structure in the cross-cross elliptical spherical roller track 1-1.

[0116] The curvature radius of the asymmetric elliptical spherical roller 15 is greater than the radius of the bearing circumferential track.

[0117] The double half inner ring 4 is provided with a circle of double semi-elliptical spherical roller tracks 8 at the inner end of the outer circumference. The curvature radius of the double semi-elliptical spherical roller tracks 8 is greater than the radius of the bearing circumferential track. The outer circumference of the double half inner ring 4 is provided with an inverse elliptical spherical roller track 17. The curvature radius of the inverse elliptical spherical roller track 17 is greater than the radius of the bearing circumferential track. The double half inner ring 4 is combined to form an inverse elliptical spherical roller track 17 with the same center and radius. The double row asymmetric elliptical spherical rollers 15 are respectively provided in the inverse elliptical spherical roller tracks 17 provided on the outer circumference of the double half inner ring 4. The outer ring 1 is coaxially arranged on both sides of the inner circumference of the outer ring 1, and is respectively combined with a circle of double semi-elliptical spherical roller tracks 8 arranged at the inner end of the outer circumference, a double row of asymmetric elliptical spherical rollers 15 arranged in the reverse elliptical spherical roller tracks 17 of the outer circumference, a center ball of a four-point contact spherically cut spherical rolling element 3 arranged in a cross-shaped arrangement in the cross-shaped elliptical spherical roller track 1-1 in the middle of the inner circumference of the outer ring 1, and double row of spherical roller tracks 16 arranged on both sides of the cross-shaped elliptical spherical roller track 1-1 on the inner circumference of the outer ring 1, to form a double row spherical roller bearing with a center ball of a cross-shaped four-point contact spherically cut spherical rolling element.

[0118] Example 5:

[0119] like Figure 5 The double-row roller bearing with a cross-cross four-point contact spherical cut spherical rolling element and a central ball shown in the figure comprises: an outer ring 1, a cross-cross rolling element cage 2, a spherical cut spherical rolling element 3, a double-half inner ring 4 and a double-row asymmetric elliptical spherical roller 15.

[0120] A circle of cross-cross elliptical spherical roller track 1-1 is set in the middle of the inner circumference of the outer ring 1. The axial section of the cross-cross elliptical spherical roller track 1-1 is a cross-crossed two groups of elliptical spherical roller track structures. The curvature radius of the cross-cross elliptical spherical roller track 1-1 is greater than the radius of the bearing circumferential track. A circle of cross-cross rolling element cage sliding groove 6 is set in the middle of the inner circumference of the outer ring 1 along the circumferential center line of the cross-cross elliptical spherical roller track 1-1. Double-row spherical roller tracks 16 are set at intervals on both sides of the cross-cross elliptical spherical roller track 1-1.

[0121] The pockets of the cross-cross rolling element cage 2 are spherically cut spherical rolling element pockets 2-1. The spherically cut spherical rolling elements 3 are arranged at 90 degrees along the center line of the cross-cross rolling element cage 2. A circle of sliding positioning guide rails 2-2 are respectively arranged along the inner and outer circumferential center lines of the cross-cross rolling element cage 2. The cross-cross rolling element cage 2 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the inner circumference of the outer ring 1.

[0122] The spherical rolling element 3 is formed by cutting off the top of the spherical surface portion of the spherical rolling element along the axis at both ends of the spherical rolling element, which is very prone to spin sliding friction. The spherical rolling element 3 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the inner circumference of the outer ring 1. The spherical rolling element 3 passes through the pockets of the cross-cross rolling element retainer 3 so that the spherical rolling element forms a cross-cross four-point contact spherical rolling element center ball structure in the cross-cross elliptical spherical roller track 1-1.

[0123] The curvature radius of the asymmetric elliptical spherical roller 15 is greater than the radius of the bearing circumferential track.

[0124] The double half inner ring 4 is provided with a circle of double semi-elliptical spherical roller tracks 8 at the inner end of the outer circumference. The curvature radius of the double semi-elliptical spherical roller tracks 8 is greater than the radius of the bearing circumferential track. The outer circumference of the double half inner ring 4 is provided with a reverse elliptical spherical roller track 17. The curvature radius of the reverse elliptical spherical roller track 17 is greater than the radius of the bearing circumferential track. A circle of spherical roller shoulders 18 is provided at the inner end of the reverse elliptical spherical roller track 17 on the outer circumference of the double half inner ring 4. After the double half inner ring 4 is combined, a reverse elliptical spherical roller track 17 with the same center and radius is formed. Double rows of asymmetric elliptical spherical rollers 15 are respectively provided on the outer circumference of the double half inner ring 4. In the reverse elliptical spherical roller track 17, the double half inner ring 4 is coaxially arranged on both sides of the inner circumference of the outer ring 1, and is respectively combined with a circle of double half elliptical spherical roller tracks 8 arranged at the inner end of the outer circumference and the double row asymmetric elliptical spherical rollers 15 arranged in the reverse elliptical spherical roller track 17 of the outer circumference, the center ball of the four-point contact spherically cut spherical rolling body 3 cross-arranged in the cross-cross elliptical spherical roller track 1-1 in the middle of the inner circumference of the outer ring 1, and the double row spherical roller tracks 16 arranged on both sides of the cross-cross elliptical spherical roller track 1-1 on the inner circumference of the outer ring 1, to form a double row spherical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

[0125] Example 6:

[0126] like Figure 6 The double-row roller bearing with a cross-cross four-point contact spherical cut spherical rolling element and a central ball shown in the figure comprises: an inner ring 19, a cross-cross rolling element retainer 2, a spherical cut spherical rolling element 3, a double half outer ring 20 and a double row asymmetric elliptical spherical roller 15.

[0127] The curvature radius of the double-row asymmetric elliptical spherical roller 15 is greater than the radius of the bearing circumferential track.

[0128] A circle of cross-cross elliptical spherical roller track 1-1 is set in the middle of the outer circumference of the inner ring 19. The axial section of the cross-cross elliptical spherical roller track 1-1 is a cross-crossed two groups of elliptical spherical roller track structures. The curvature radius of the cross-cross elliptical spherical roller track 1-1 is greater than the radius of the bearing circumferential track. A circle of cross-cross rolling element retainer sliding groove 6 is set along the circumferential center line of the cross-cross elliptical spherical roller track 1-1 in the middle of the outer circumference of the inner ring 19. Double-row spherical roller tracks 16 are set at intervals on both sides of the cross-cross elliptical spherical roller track 1-1. Double-row asymmetric elliptical spherical rollers 15 are respectively set in the double-row spherical roller tracks 16 set at intervals on both sides of the cross-cross elliptical spherical roller track 1-1 on the outer circumference of the inner ring 19.

[0129] The pockets of the cross-cross rolling element cage 2 are spherically cut spherical rolling element pockets 2-1. The spherically cut spherical rolling elements 3 are arranged at 90 degrees along the center line of the cross-cross rolling element cage 2. A circle of sliding positioning guide rails 2-2 are respectively arranged along the inner and outer circumferential center lines of the cross-cross rolling element cage 2. The cross-cross rolling element cage 2 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the outer circumference of the inner ring 19.

[0130] The spherical rolling element 3 is formed by cutting off the top of the spherical surface portion of the spherical rolling element along the two ends of the axis, which is very prone to spin sliding friction. The spherical rolling element 3 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the outer circumference of the inner ring 19. The spherical rolling element 3 passes through the pockets of the cross-cross rolling element retainer 3 so that the spherical rolling element forms a cross-cross four-point contact spherical rolling element center ball structure in the cross-cross elliptical spherical roller track 1-1.

[0131] The double half outer ring 20 is provided with a circle of double semi-elliptical spherical roller tracks 8 at the inner end of the inner circumference. The curvature radius of the double semi-elliptical spherical roller tracks 8 is greater than the radius of the bearing circumferential track. The inner circumference of the double half outer ring 20 is provided with an elliptical spherical roller track 21. The curvature radius of the elliptical spherical roller track 21 is greater than the radius of the bearing circumferential track. The double half outer ring 20 is combined to form an elliptical spherical roller track with the same center and radius. The double half outer ring 20 is coaxially arranged on both sides of the outer circumference of the inner ring 19 and passes through A circle of double semi-elliptical rolling body tracks 8 arranged at the inner end of the inner circumference and the elliptical spherical roller track 21 arranged on the inner circumference are combined with the center ball of the four-point contact spherically cut spherical rolling body 3 arranged in a cross-cross elliptical spherical roller track 1-1 in the middle of the outer circumference of the inner ring 19, and the double-row asymmetric elliptical spherical balls 15 arranged in the double-row spherical roller tracks 16 on both sides of the cross-cross elliptical spherical roller track 1-1 on the outer circumference of the inner ring 19, forming a double-row spherical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

[0132] Example 7:

[0133] like Figure 7 The double-row roller bearing with a cross-cross four-point contact spherical cut spherical rolling element and a central ball shown in the figure comprises: an inner ring 19, a cross-cross rolling element retainer 2, a spherical cut spherical rolling element 3, a double half outer ring 20 and a double row asymmetric elliptical spherical roller 15.

[0134] A circle of cross-cross elliptical spherical roller track 1-1 is set in the middle of the outer circumference of the inner ring 19. The axial section of the cross-cross elliptical spherical roller track 1-1 is a cross-crossed two groups of elliptical spherical roller track structures. The curvature radius of the cross-cross elliptical spherical roller track 1-1 is greater than the radius of the bearing circumferential track. A circle of cross-cross rolling element retainer sliding groove 6 is set in the middle of the outer circumference of the inner ring 19 along the circumferential center line of the cross-cross elliptical spherical roller track 1-1. Double-row spherical roller tracks 16 are set at intervals on both sides of the cross-cross elliptical spherical roller track 1-1.

[0135] The pockets of the cross-cross rolling element cage 2 are spherically cut spherical rolling element pockets 2-1. The spherically cut spherical rolling elements 3 are arranged at 90 degrees along the center line of the cross-cross rolling element cage 2. A circle of sliding positioning guide rails 2-2 are respectively arranged along the inner and outer circumferential center lines of the cross-cross rolling element cage 2. The cross-cross rolling element cage 2 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the outer circumference of the inner ring 19.

[0136] The spherical rolling element 3 is formed by cutting off the top of the spherical surface portion of the spherical rolling element along the two ends of the axis, which is very prone to spin sliding friction. The spherical rolling element 3 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the outer circumference of the inner ring 19. The spherical rolling element 3 passes through the pockets of the cross-cross rolling element retainer 3 so that the spherical rolling element forms a cross-cross four-point contact spherical rolling element center ball structure in the cross-cross elliptical spherical roller track 1-1.

[0137] The curvature radius of the double-row asymmetric elliptical spherical roller 15 is greater than the radius of the bearing circumferential track.

[0138] The double half outer ring 20 is respectively provided with a circle of double semi-elliptical spherical roller tracks 8 at the inner end of the inner circumference. The curvature radius of the double semi-elliptical spherical roller tracks 8 is greater than the radius of the bearing circumferential track. The inner circumference of the double half outer ring 20 is respectively provided with an elliptical spherical roller track 21 with the same radius as the circle center. The curvature radius of the elliptical spherical roller track 21 is greater than the radius of the bearing circumferential track. A circle of spherical roller shoulders 18 is respectively provided at the inner end of the elliptical spherical roller track 21 on the inner circumference of the double half outer ring 20. After the double half outer ring 20 is combined, an elliptical spherical roller track with the same center and radius is formed. The double row asymmetric elliptical spherical rollers 15 are respectively provided on the inner circumference of the double half outer ring 20. In the elliptical spherical roller track 21, the double half outer rings 20 are coaxially arranged on both sides of the outer circumference of the inner ring 19, and are respectively combined through a circle of double half elliptical rolling body tracks 8 arranged at the inner end of the inner circumference and the double row asymmetric elliptical spherical rollers 15 arranged in the inner circumference elliptical spherical roller track 21, and the center ball of the four-point contact spherically cut spherical rolling body 3 cross-arranged in the cross-cross elliptical spherical roller track 1-1 in the middle of the outer circumference of the inner ring 19 and the double row spherical roller tracks 16 arranged on both sides of the cross-cross elliptical spherical roller track 1-1 on the outer circumference of the inner ring 19, to form a double row spherical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

[0139] Example 8:

[0140] like Figure 8 The double-row roller bearing shown in the figure has a cross-four-point contact spherical cut spherical rolling element with a central ball, comprising: an outer ring 1, a cross-rolling element retainer 2, a spherical cut spherical rolling element 3, a double-half inner ring 4, and a double-row spherical rolling element 22.

[0141] A circle of cross-cross elliptical spherical roller track 1-1 is set in the middle of the inner circumference of the outer ring 1. The axial section of the cross-cross elliptical spherical roller track 1-1 is a cross-crossed two groups of elliptical spherical roller track structures. The curvature radius of the cross-cross elliptical spherical roller track 1-1 is greater than the radius of the bearing circumferential track. A circle of cross-cross rolling element retainer sliding groove 6 is set in the middle of the inner circumference of the outer ring 1 along the circumferential center line of the cross-cross elliptical spherical roller track 1-1. Double-row angular contact spherical rolling element tracks 23 are set at intervals on both sides of the cross-cross elliptical spherical roller track 1-1.

[0142] The pockets of the cross-cross rolling element cage 2 are spherically cut spherical rolling element pockets 2-1. The spherically cut spherical rolling elements 3 are arranged at 90 degrees along the center line of the cross-cross rolling element cage 2. A circle of sliding positioning guide rails 2-2 are respectively arranged along the inner and outer circumferential center lines of the cross-cross rolling element cage 2. The cross-cross rolling element cage 2 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the inner circumference of the outer ring 1.

[0143] The spherical rolling element 3 is formed by cutting off the top of the spherical surface portion of the spherical rolling element along the axis at both ends of the spherical rolling element, which is very prone to spin sliding friction. The spherical rolling element 3 is arranged in a circle of cross-cross elliptical spherical roller tracks 1-1 arranged in the middle of the inner circumference of the outer ring 1. The spherical rolling element 3 passes through the pockets of the cross-cross rolling element retainer 3 so that the spherical rolling element forms a cross-cross four-point contact spherical rolling element center ball structure in the cross-cross elliptical spherical roller track 1-1.

[0144] The double half inner ring 4 is provided with a circle of double semi-elliptical spherical roller tracks 8 at the inner end of the outer circumference. The curvature radius of the double semi-elliptical spherical roller tracks 8 is greater than the radius of the bearing circumferential track. The middle of the outer circumference of the double half inner ring 4 is provided with an angular contact spherical rolling body track 24. The double rows of spherical rolling bodies 22 are respectively provided in the angular contact spherical rolling body track 24 provided in the middle of the outer circumference of the double half inner ring 4. The double half inner ring 4 is coaxially provided on both sides of the inner circumference of the outer ring 1, and is respectively provided with a The double-row spherical rolling elements 22 arranged in the double semi-elliptical spherical roller track 8 and the angular contact spherical rolling element track 24 in the middle of the outer circumference are combined with the central ball of the four-point contact spherically cut spherical rolling element 3 arranged in a cross-cross elliptical spherical roller track 1-1 in the middle of the inner circumference of the outer ring 1 and the double-row angular contact spherical rolling element tracks 23 on both sides of the cross-cross elliptical spherical roller track 1-1 on the inner circumference of the outer ring 1 to form a double-row angular contact spherical rolling element bearing with a central ball of a cross-cross four-point contact spherically cut spherical rolling element.

[0145] Example 9:

[0146] like Figure 9 、 Figure 15 The double-row roller bearing shown in the figure has a cross-four-point contact spherical cut spherical rolling element with a central ball, comprising: an outer ring 1, a cross-rolling element retainer 2, a spherical cut spherical rolling element 3, a double-half inner ring 4, and a double-row spherical rolling element 22.

[0147] A circle of cross-cross elliptical spherical roller track 1-1 is set in the middle of the inner circumference of the outer ring 1. The axial section of the cross-cross elliptical spherical roller track 1-1 is a cross-crossed two groups of elliptical spherical roller track structures. The curvature radius of the cross-cross elliptical spherical roller track 1-1 is greater than the radius of the bearing circumferential track. A circle of cross-cross rolling element retainer sliding groove 6 is set in the middle of the inner circumference of the outer ring 1 along the circumferential center line of the cross-cross elliptical spherical roller track 1-1. Double-row angular contact spherical rolling element tracks 23 are set at intervals on both sides of the cross-cross elliptical spherical roller track 1-1.

[0148] The pockets of the cross-cross rolling element retainer 2 are spherically cut spherical rolling element pockets 2-1. The spherically cut spherical rolling element pockets 2-1 are arranged at 90 degrees along the circumferential centerline of the cross-cross rolling element retainer 2. Axis pin holes 25 are arranged at the coaxial centerline on both sides of the pockets along the axial centerline of the spherically cut spherical rolling element 3. A circle of sliding positioning guide rails 2-2 are respectively arranged along the inner and outer circumferential centerlines of the cross-cross rolling element retainer 2. The cross-cross rolling element retainer 2 is arranged in the deep groove spherical rolling element track 1-1 provided in the middle of the inner circumference of the outer ring 1.

[0149] The spherical rolling body 3 is formed by cutting off the top of the spherical surface part that is extremely prone to spin sliding friction at both ends of the spherical rolling body along the axis. An axial hole 26 is set along the axis line of the spherical rolling body 3. The spherical rolling body 3 is set in a circle of deep groove spherical rolling body track 1-1 set in the middle of the inner circumference of the outer ring 1. The spherical rolling body 3 and the cross-cross rolling body retainer 2 are connected by the axial pin holes 25 set on both sides of the spherical rolling body pocket 2-1 of the cross-cross rolling body retainer 2 through the axial hole 26 of the spherical rolling body 3 and the axial pin holes 25 set on the coaxial center line of the spherical rolling body pocket 2-1 of the cross-cross rolling body retainer 2, thereby forming a rotational positioning.

[0150] The double half inner ring 4 is provided with a circle of double semi-elliptical spherical roller tracks 8 at the inner end of the outer circumference. The curvature radius of the double semi-elliptical spherical roller tracks 8 is greater than the radius of the bearing circumferential track. The middle of the outer circumference of the double half inner ring 4 is provided with an angular contact spherical rolling body track 24. The double rows of spherical rolling bodies 22 are respectively provided in the angular contact spherical rolling body track 24 provided in the middle of the outer circumference of the double half inner ring 4. The double half inner ring 4 is coaxially provided on both sides of the inner circumference of the outer ring 1, and is respectively provided with a circle of double semi-elliptical spherical roller tracks 8 at the inner end of the outer circumference. The double row spherical rolling elements 22 arranged in the semi-ellipsoidal roller track 8 and the angular contact spherical rolling element track 24 in the middle of the outer circumference are combined with the center ball of the four-point contact spherically cut spherical rolling element 3 arranged in a cross-cross elliptical spherical roller track 1-1 in the middle of the inner circumference of the outer ring 1 and the double row angular contact spherical rolling element tracks 23 arranged on both sides of the cross-cross elliptical spherical roller track 1-1 on the inner circumference of the outer ring 1 to form a double row angular contact spherical rolling element bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling element.

Claims

1. A double-row roller bearing with a cross-four-point contact spherical cut-shaped rolling element and a centrally placed ball, comprising: The outer ring, cross rolling element cage, spherical cut spherical rolling element, double half inner ring and double row cylindrical roller are characterized in that: a circle of cross elliptical spherical roller track is set in the middle of the inner circumference of the outer ring, the curvature radius of the cross elliptical spherical roller track is greater than the radius of the bearing circumference track, and double row cylindrical roller tracks are set on both sides of the cross elliptical spherical roller track. The outer ring is provided with a circle of cross-crossed elliptical spherical roller tracks in the middle of its inner circumference. The axial section of the cross-crossed elliptical spherical roller tracks is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the cross-crossed elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element cage sliding grooves is provided in the middle of the inner circumference of the outer ring along the circumferential center line of the cross-crossed elliptical spherical roller tracks. Double rows of cylindrical roller tracks are provided at intervals on both sides of the cross-crossed elliptical spherical roller tracks. The pockets of the cross-cross rolling element cage are spherically cut spherical rolling element pocket structures. The spherically cut spherical rolling elements are arranged at 90 degrees along the two sides of the circumferential center line of the cross-cross rolling element cage. A circle of sliding positioning guide rails are respectively arranged along the inner and outer circumferential center lines of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface portion that is extremely prone to spin sliding friction at both ends of the spherical rolling body along the axis, and the "spherical cutting spherical rolling body" is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the spherical cutting spherical rolling body forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller tracks. The double half inner rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner ends of the outer circumferences, and the curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. Cylindrical roller tracks are respectively provided in the middle of the outer circumferences of the double half inner rings, and double rows of cylindrical rollers are respectively provided in the cylindrical sub-tracks provided in the middle of the outer circumferences of the double half inner rings. The double half inner rings are coaxially provided on both sides of the inner circumference of the outer ring, and are respectively combined with a circle of double semi-elliptical spherical roller tracks provided at the inner ends of the outer circumferences and the double rows of cylindrical rollers provided in the cylindrical sub-tracks in the middle of the outer circumference, the center ball of the cross-cross four-point contact spherically cut spherical rolling body provided in the cross-cross elliptical spherical roller track in the middle of the inner circumference of the outer ring and the double rows of cylindrical sub-tracks provided on both sides of the cross-cross elliptical spherical roller track on the inner circumference of the outer ring, to form a double row cylindrical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

2. A double-row roller bearing with a cross-four-point contact spherical cut-shaped rolling element and a centrally placed ball, comprising: The outer ring, cross rolling element cage, spherical cut spherical rolling element, double half inner ring and double row elliptical spherical roller are characterized in that: a circle of cross elliptical spherical roller track is set in the middle of the inner circumference of the outer ring, the curvature radius of the cross elliptical spherical roller track is greater than the radius of the bearing circumference track, and double row elliptical spherical roller tracks are set on both sides of the cross elliptical spherical roller track. The outer ring is provided with a circle of cross-crossed elliptical spherical roller tracks in the middle of its inner circumference. The axial section of the cross-crossed elliptical spherical roller tracks is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element retainer sliding grooves is provided in the middle of the inner circumference of the outer ring along the circumferential center line of the cross-crossed elliptical spherical roller tracks. Double rows of elliptical spherical roller tracks are provided at intervals on both sides of the cross-crossed elliptical spherical roller tracks. The curvature radius of the double rows of elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. The pockets of the cross-cross rolling element cage are spherically cut spherical rolling element pocket structures. The spherically cut spherical rolling elements are arranged at 90 degrees along the two sides of the circumferential center line of the cross-cross rolling element cage. A circle of sliding positioning guide rails are respectively arranged along the inner and outer circumferential center lines of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface portion that is extremely prone to spin sliding friction along the two ends of the axis of the spherical rolling body, thereby forming a spherical cutting spherical rolling body structure. The spherical cutting spherical rolling body is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the spherical cutting spherical rolling body forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller tracks. The curvature radius of the double-row elliptical spherical roller is greater than the radius of the bearing circumferential track. The double half inner rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner end of the outer circumference, the curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the bearing circumferential track, and an elliptical spherical roller track is respectively provided in the middle of the outer circumference of the double half inner rings, the curvature radius of the elliptical spherical roller track is greater than the radius of the bearing circumferential track, and double rows of elliptical spherical rollers are respectively provided in the elliptical spherical roller tracks provided in the middle of the outer circumference of the double half inner rings, and the double half inner rings are coaxially provided on both sides of the inner circumference of the outer ring, and A double-row elliptical spherical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body is formed by combining a double-semi-elliptical spherical roller track arranged at the inner end of the outer circumference and a double-row elliptical spherical roller track arranged in the elliptical spherical roller track in the middle of the outer circumference, with a center ball of a cross-cross four-point contact spherically cut spherical rolling body arranged in the cross-cross elliptical spherical roller track in the middle of the inner circumference of the outer ring and double-row elliptical spherical roller tracks arranged on both sides of the cross-cross elliptical spherical roller track on the inner circumference of the outer ring.

3. A double-row roller bearing with a cross-four-point contact spherical cut-shaped rolling element and a centrally placed ball, comprising: The outer ring, cross rolling element cage, spherical cut spherical rolling element, double half inner ring, double row elliptical spherical roller and carbide outer track are characterized in that: a circle of cross elliptical spherical roller track is set in the middle of the inner circumference of the outer ring, the curvature radius of the cross elliptical spherical roller track is greater than the radius of the bearing circumference track, and bearing sleeves are respectively set on both sides of the cross elliptical spherical roller track. The outer ring is provided with a circle of cross-crossed elliptical spherical roller tracks in the middle of its inner circumference. The axial section of the cross-crossed elliptical spherical roller tracks is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element cage sliding grooves is provided in the middle of the inner circumference of the outer ring along the circumferential center line of the cross-crossed elliptical spherical roller tracks. Bearing sleeves are respectively provided at intervals on both sides of the cross-crossed elliptical spherical roller tracks. The pockets of the cross-cross rolling element cage are "spherically cut spherical rolling elements" with a "spherically cut spherical rolling element" structure. The "spherically cut spherical rolling elements" are arranged at 90-degree intervals on both sides of the circumferential centerline of the cross-cross rolling element cage. A circle of sliding positioning guide rails is respectively arranged along the inner and outer circumferential centerlines of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface portion that is extremely prone to spin sliding friction along the two ends of the axis of the spherical rolling body, thereby forming a spherical cutting spherical rolling body structure. The spherical cutting spherical rolling body is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the spherical cutting spherical rolling body forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller tracks. The carbide outer track is a sleeve structure with an elliptical spherical roller track arranged on the inner circumference. The curvature radius of the elliptical spherical roller track is greater than the radius of the bearing circumferential track. The curvature radius of the double-row elliptical spherical roller is greater than the radius of the bearing circumferential track. The double half inner rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner end of the outer circumference, the curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the bearing circumferential track, and an elliptical spherical roller track is respectively provided in the middle of the outer circumference of the double half inner rings, the curvature radius of the elliptical spherical roller track is greater than the radius of the bearing circumferential track, and double rows of elliptical spherical rollers are respectively provided in the elliptical spherical roller tracks provided in the middle of the outer circumference of the double half inner rings. The elliptical spherical roller tracks of the double half inner rings are respectively combined by double rows of elliptical spherical rollers and the elliptical spherical roller tracks provided on the inner circumference of the carbide outer track. An elliptical spherical roller bearing structure is formed, with two half inner rings coaxially arranged on both sides of the inner circumference of the outer ring, and a circle of double half elliptical spherical roller tracks arranged at the inner end of the outer circumference and the outer circumference of the carbide track of the elliptical spherical roller bearing arranged on the outer circumference are respectively combined with the center ball of the four-point contact spherically cut spherical rolling body cross-arranged in the cross-cross elliptical spherical roller track in the middle of the inner circumference of the outer ring and the bearing sleeves arranged on both sides of the cross-cross elliptical spherical roller track on the inner circumference of the outer ring, forming a double-row elliptical spherical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

4. A double-row roller bearing with a cross-four-point contact spherical cut-shaped rolling element and a centrally placed ball, comprising: The outer ring, cross rolling element cage, spherical cut spherical rolling element, double half inner ring and double row asymmetric elliptical spherical roller are characterized in that: a circle of cross elliptical spherical roller track is set in the middle of the inner circumference of the outer ring, the curvature radius of the cross elliptical spherical roller track is greater than the radius of the bearing circumferential track, and double row spherical roller tracks are set on both sides of the cross elliptical spherical roller track. The outer ring is provided with a circle of cross-crossed elliptical spherical roller tracks in the middle of its inner circumference. The axial section of the cross-crossed elliptical spherical roller tracks is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the cross-crossed elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element cage sliding grooves is provided in the middle of the inner circumference of the outer ring along the circumferential center line of the cross-crossed elliptical spherical roller tracks. Double rows of spherical roller tracks are provided at intervals on both sides of the cross-crossed elliptical spherical roller tracks. The pockets of the cross-cross rolling element cage are "spherically cut spherical rolling elements" with a "spherically cut spherical rolling element" structure. The "spherically cut spherical rolling elements" are arranged at 90-degree intervals on both sides of the circumferential centerline of the cross-cross rolling element cage. A circle of sliding positioning guide rails is respectively arranged along the inner and outer circumferential centerlines of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface portion that is extremely prone to spin sliding friction along the two ends of the axis of the spherical rolling body, thereby forming a spherical cutting spherical rolling body structure. The spherical cutting spherical rolling body is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the "spherical cutting spherical rolling body" forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller tracks. The curvature radius of the double-row asymmetric elliptical spherical roller is greater than the radius of the bearing's circumferential track. The double half inner rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner ends of the outer circumferences. The curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. The outer circumferences of the double half inner rings are respectively provided with reverse elliptical spherical roller tracks. The curvature radius of the reverse elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. After the double half inner rings are combined, reverse elliptical spherical roller tracks with the same center and radius are formed. Double rows of asymmetric elliptical spherical rollers are respectively provided in the reverse elliptical spherical roller tracks provided on the outer circumferences of the double half inner rings. The double half inner rings are coaxially arranged on both sides of the inner circumference of the outer ring, and are respectively formed through a circle of double half elliptical spherical roller tracks arranged at the inner end of the outer circumference, a double row of asymmetric elliptical spherical rollers arranged in the reverse elliptical spherical roller tracks of the outer circumference, a combination of a center ball of a four-point contact spherically cut spherical rolling body arranged in a cross-cross elliptical spherical roller track in the middle of the inner circumference of the outer ring, and a double row of spherical roller tracks arranged on both sides of the cross-cross elliptical spherical roller track on the inner circumference of the outer ring, to form a double row spherical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

5. A double-row roller bearing with a cross-four-point contact spherical cut-shaped rolling element and a centrally placed ball, comprising: The outer ring, cross rolling element cage, spherical cut spherical rolling element, double half inner ring and double row asymmetric elliptical spherical roller are characterized in that: a circle of cross-cross elliptical spherical roller track is set in the middle of the inner circumference of the outer ring, the curvature radius of the cross-cross elliptical spherical roller track is greater than the radius of the bearing circumferential track, spherical cut spherical rolling elements are set in a cross-cross pattern inside the cross-cross elliptical spherical roller track, and double row spherical roller tracks are set on both sides of the cross-cross elliptical spherical roller track. The outer ring is provided with a circle of cross-crossed elliptical spherical roller tracks in the middle of its inner circumference. The axial section of the cross-crossed elliptical spherical roller tracks is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the cross-crossed elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element cage sliding grooves is provided in the middle of the inner circumference of the outer ring along the circumferential center line of the cross-crossed elliptical spherical roller tracks. Double rows of spherical roller tracks are provided at intervals on both sides of the cross-crossed elliptical spherical roller tracks. The pockets of the cross-cross rolling element cage are "spherically cut spherical rolling elements" with a "spherically cut spherical rolling element" structure. The "spherically cut spherical rolling elements" are arranged at 90-degree intervals on both sides of the circumferential centerline of the cross-cross rolling element cage. A circle of sliding positioning guide rails is respectively arranged along the inner and outer circumferential centerlines of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface portion that is extremely prone to spin sliding friction along the two ends of the axis of the spherical rolling body, thereby forming a spherical cutting spherical rolling body structure. The spherical cutting spherical rolling body is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the spherical cutting spherical rolling body forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller tracks. The curvature radius of the double-row asymmetric elliptical spherical roller is greater than the radius of the bearing's circumferential track. The double half inner rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner end of the outer circumference, and the curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. The outer circumferences of the double half inner rings are respectively provided with reverse elliptical spherical roller tracks, and the curvature radius of the reverse elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of spherical roller shoulders is respectively provided at the inner end of the reverse elliptical spherical roller tracks on the outer circumferences of the double half inner rings. After the double half inner rings are combined, reverse elliptical spherical roller tracks with the same center and radius are formed. Double rows of asymmetric elliptical spherical rollers are respectively provided on the outer circumference of the inner rings. In the reverse elliptical spherical roller track, the double half inner rings are coaxially arranged on both sides of the inner circumference of the outer ring, and a circle of double half elliptical spherical roller tracks arranged at the inner end of the outer circumference and the double rows of asymmetric elliptical spherical rollers arranged in the reverse elliptical spherical roller tracks on the outer circumference are respectively combined with the center ball of the four-point contact spherically cut spherical rolling body cross-arranged in the cross-cross elliptical spherical roller track in the middle of the inner circumference of the outer ring and the double rows of spherical roller tracks arranged on both sides of the cross-cross elliptical spherical roller track on the inner circumference of the outer ring to form a double row spherical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

6. A double-row roller bearing with a cross-four-point contact spherical cut-shaped rolling element and a centrally placed ball, comprising: The inner ring, cross rolling element cage, spherically cut spherical rolling element, double half outer ring and double row asymmetric elliptical spherical roller are characterized in that: a circle of cross-cross elliptical spherical roller track is set in the middle of the outer circumference of the inner ring, the curvature radius of the cross-cross elliptical spherical roller track is greater than the radius of the bearing circumferential track, spherically cut spherical rolling elements are set in a cross pattern inside the cross-cross elliptical spherical roller track, and double row spherical roller tracks are set on both sides of the cross-cross elliptical spherical roller track. The curvature radius of the double-row asymmetric elliptical spherical roller is greater than the radius of the bearing's circumferential track. The inner ring is provided with a circle of cross-crossed elliptical spherical roller track in the middle of its outer circumference. The axial section of the cross-crossed elliptical spherical roller track is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the cross-crossed elliptical spherical roller track is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element retainer sliding groove is provided in the middle of the outer circumference of the inner ring along the circumferential center line of the cross-crossed elliptical spherical roller track. Double-row spherical roller tracks are provided at intervals on both sides of the cross-crossed elliptical spherical roller track. Double-row asymmetric elliptical spherical rollers are respectively provided in the double-row spherical roller tracks provided on both sides of the cross-crossed elliptical spherical roller track in the middle of the outer circumference of the inner ring. The pockets of the cross-cross rolling element cage are spherically cut spherical rolling element pocket structures. The spherically cut spherical rolling elements are arranged at 90 degrees along the center line of the cross-cross rolling element cage. A circle of sliding positioning guide rails are respectively arranged along the center line of the inner and outer circumferences of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the outer circumference of the inner ring. The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface part that is extremely prone to spin sliding friction along the two ends of the axis of the spherical rolling body, thereby forming a spherical cutting spherical rolling body structure. The spherical cutting spherical rolling body is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the outer circumference of the inner ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the spherical cutting spherical rolling body forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller tracks. The double half outer rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner end of the inner circumference. The curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. The inner circumference of the double half outer rings is respectively provided with elliptical spherical roller tracks with the same center and radius. After the double half outer rings are combined, an elliptical spherical roller track with the same center and radius is formed. The curvature radius of the elliptical spherical roller track is greater than the radius of the bearing circumferential track. The double half outer rings are coaxially arranged on both sides of the outer circumference of the inner ring. A double-row spherical roller bearing with a center ball of a cross-crossed four-point contact spherically cut spherical rolling body is formed by combining a double-semi-elliptical rolling body track arranged at the inner end of the inner circumference, an elliptical spherical roller track arranged on the inner circumference, a four-point contact spherically cut spherical rolling body with a center ball arranged in a cross-crossed elliptical spherical roller track in the middle of the outer circumference of the inner ring, and double-row asymmetric elliptical spherical rollers arranged in double-row spherical roller tracks on both sides of the cross-crossed elliptical spherical roller track on the outer circumference of the inner ring.

7. A double-row roller bearing with a cross-four-point contact spherical cut-shaped rolling element and a centrally placed ball, comprising: The inner ring, cross rolling element cage, spherically cut spherical rolling element, double half outer ring and double row asymmetric elliptical spherical roller are characterized in that: a circle of cross-cross elliptical spherical roller track is set in the middle of the outer circumference of the inner ring, the curvature radius of the cross-cross elliptical spherical roller track is greater than the radius of the bearing circumferential track, spherically cut spherical rolling elements are set in a cross pattern inside the cross-cross elliptical spherical roller track, and double row spherical roller tracks are set on both sides of the cross-cross elliptical spherical roller track. The inner ring is provided with a circle of cross-crossed elliptical spherical roller tracks in the middle of its outer circumference. The axial section of the cross-crossed elliptical spherical roller tracks is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the cross-crossed elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element cage sliding grooves is provided in the middle of the outer circumference of the inner ring along the circumferential center line of the cross-crossed elliptical spherical roller tracks. Double rows of spherical roller tracks are provided at intervals on both sides of the cross-crossed elliptical spherical roller tracks. The pockets of the cross-cross rolling element cage are "spherically cut spherical rolling elements" with a "spherically cut spherical rolling element" structure. The "spherically cut spherical rolling elements" are arranged at 90-degree intervals on both sides of the circumferential centerline of the cross-cross rolling element cage. A circle of sliding positioning guide rails is respectively arranged along the inner and outer circumferential centerlines of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the outer circumference of the inner ring. The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface part that is extremely prone to spin sliding friction along the two ends of the axis of the spherical rolling body, thereby forming a spherical cutting spherical rolling body structure. The spherical cutting spherical rolling body is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the outer circumference of the inner ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the spherical cutting spherical rolling body forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller tracks. The curvature radius of the double-row asymmetric elliptical spherical roller is greater than the radius of the bearing's circumferential track. The double half outer rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner end of the inner circumference, and the curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. The inner circumference of the double half outer rings is respectively provided with an elliptical spherical roller track with the same radius as the circle center, and a circle of spherical roller shoulders is respectively provided at the inner end of the elliptical spherical roller track on the inner circumference of the double half outer rings. After the double half outer rings are combined, an elliptical spherical roller track with the same center and radius is formed. The curvature radius of the elliptical spherical roller track is greater than the radius of the bearing circumferential track. Double rows of asymmetric elliptical spherical rollers are respectively provided on the inner circumference of the double half outer rings. In the separately arranged elliptical spherical roller track, the double half outer rings are coaxially arranged on both sides of the outer circumference of the inner ring, and through a circle of double half elliptical rolling body tracks arranged at the inner end of the inner circumference and the double rows of asymmetric elliptical spherical rollers respectively arranged in the inner circumference elliptical spherical roller track, the center ball of the four-point contact spherically cut spherical rolling body cross-arranged in the cross-cross elliptical spherical roller track in the middle of the outer circumference of the inner ring, and the double rows of spherical roller tracks arranged on both sides of the cross-cross elliptical spherical roller track on the outer circumference of the inner ring, a double row spherical roller bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body is formed.

8. A double-row roller bearing with a cross-four-point contact spherical cut-shaped rolling element and a centrally placed ball, comprising: The outer ring, cross rolling element cage, spherical cut spherical rolling element, double half inner ring, and double row spherical rolling element are characterized in that: a circle of cross-cross elliptical spherical roller track is set in the middle of the inner circumference of the outer ring, the curvature radius of the cross-cross elliptical spherical roller track is greater than the radius of the bearing circumferential track, spherical cut spherical rolling elements are cross-arranged in the cross-cross elliptical spherical roller track, and double row angular contact spherical rolling element tracks are set on both sides of the cross-cross elliptical spherical roller track. The outer ring is provided with a circle of cross-crossed elliptical spherical roller tracks in the middle of its inner circumference. The axial section of the cross-crossed elliptical spherical roller tracks is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the cross-crossed elliptical spherical roller tracks is greater than the radius of the bearing circumferential track. A circle of cross-crossed rolling element cage sliding grooves is provided in the middle of the inner circumference of the outer ring along the circumferential center line of the cross-crossed elliptical spherical roller tracks. Double-row angular contact spherical rolling tracks are provided at intervals on both sides of the cross-crossed elliptical spherical roller tracks. The pockets of the cross-cross rolling element cage are "spherically cut spherical rolling elements" with a "spherically cut spherical rolling element" structure. The "spherically cut spherical rolling elements" are arranged at 90-degree intervals on both sides of the circumferential centerline of the cross-cross rolling element cage. A circle of sliding positioning guide rails is respectively arranged along the inner and outer circumferential centerlines of the cross-cross rolling element cage. The cross-cross rolling element cage is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body is formed by cutting off the top of the spherical surface portion that is extremely prone to spin sliding friction along the two ends of the axis of the spherical rolling body, thereby forming a spherical cutting spherical rolling body structure. The spherical cutting spherical rolling body is arranged in a circle of cross-cross elliptical spherical roller tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling body passes through the pockets of the cross-cross rolling body cage so that the spherical cutting spherical rolling body forms a cross-cross four-point contact spherical cutting spherical rolling body center ball structure in the cross-cross elliptical spherical roller tracks. The double half inner rings are respectively provided with a circle of double semi-elliptical spherical roller tracks at the inner ends of the outer circumferences, the curvature radius of the double semi-elliptical spherical roller tracks is greater than the radius of the elliptical spherical roller circumferential tracks, and angular contact spherical rolling body tracks are respectively provided in the middle of the outer circumferences of the double half inner rings, and the double rows of spherical rolling bodies are respectively provided in the angular contact spherical rolling body tracks provided in the middle of the outer circumferences of the double half inner rings. The double half inner rings are coaxially provided on both sides of the inner circumference of the outer ring, and are respectively combined with the center ball of the four-point contact spherically cut spherical rolling body cross-arranged in the cross-cross elliptical spherical roller track in the middle of the inner circumference of the outer ring and the double rows of angular contact spherical rolling body tracks provided on both sides of the cross-cross elliptical spherical roller track on the inner circumference of the outer ring to form a double row angular contact ball bearing with a center ball of a cross-cross four-point contact spherically cut spherical rolling body.

9. A double-row roller bearing with a cross-four-point contact spherical cut spherical rolling element and a centrally placed ball according to any one of claims 1 to 8, characterized in that: The spherical rolling body is provided with an axial hole along the axis of the spherical rolling body. The spherical rolling element pocket of the cross rolling element retainer is a pocket structure with an axial pin hole. Axial pin holes are set at the coaxial center lines on both sides of the pocket along the axis of the spherical rolling element. The spherical rolling element and the cross rolling element retainer are connected by an axial pin through the axial hole of the spherical rolling element and the axial pin holes set at the coaxial center lines on both sides of the spherical rolling element pocket of the cross rolling element retainer, forming rotational positioning.

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