Crisscross four-point contact ball bearing provided with ball-cut-shaped spherical rolling bodies

Abstract

The invention relates to a bearing, in particular to a crisscross four-point contact ball bearing provided with a ball-cut-shaped spherical rolling body, which comprises an outer ferrule, a double-half inner ferrule, the ball-cut-shaped spherical rolling body and a crisscross rolling body retainer, 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 to form the ball-cut-shaped spherical rolling body; the ball bearing breaks through the limitation that a four-point contact ball bearing can only bear an axial load in a two-point connection and one-way manner, and each ball-cut spherical rolling body forms a crossed stress state in a good state of two-point contact, pure rolling and no rotary friction, so that the axial clearance of the bearing is selected between zero axial clearance and negative axial clearance; the slewing bearing has the characteristics of high rigidity, pure rolling, low friction, high rotating speed, low heating and long service life, and is the best choice for all joint slewing bearings of high-precision and high-rotating-speed equipment or high-precision and high-rotating-speed robots at present.

Description

Technical Field

[0001] The present invention relates to a bearing, in particular to a cross four-point contact ball bearing provided with spherically cut spherical rolling elements. 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 created a special dynamic structure of a cross-shaped four-point contact ball bearing with spherically cut spherical rolling elements and a cross-shaped rolling element cage, which has the following significant dynamic 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 a cross-four-point contact spherical cut spherical rolling element bearing dynamic structure, 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, no rotation friction, uniform stress and bearing combined load of four-point contact ball bearings, but also has the characteristics of low friction, ultra-high speed rotation, low heat generation 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 technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0013] A cross-shaped four-point contact ball bearing with spherically cut spherical rolling elements comprises an outer ring, a cross-shaped rolling element retainer, a spherically cut spherical rolling element, and a double-half inner ring. The characteristic feature is that the spherical rolling elements are cut away in parallel at the top of the spherical surface at both ends of the rotation axis to form a spherically cut spherical rolling element structure. The spherically cut spherical rolling elements are arranged in a circle of deep groove spherical rolling element tracks provided in the middle of the inner circumference of the outer ring. The spherically cut spherical rolling elements, under the action of the cross-shaped rolling element retainer, form a cross-shaped four-point contact ball bearing structure.

[0014] The outer ring is provided with a circle of deep groove spherical rolling element tracks in the middle of its inner circumference, and a circle of cross rolling element retainer sliding grooves is provided along the circumferential center line of the deep groove spherical rolling element tracks in the middle of the inner circumference of the outer ring.

[0015] The pockets of the cross-cross rolling element cage are spherical rolling element pockets with a spherical cut shape. The spherical cut spherical rolling element pockets 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 deep groove spherical rolling element tracks arranged in the middle of the inner circumference of the outer ring.

[0016] The spherical rolling element is formed by cutting off the top of the spherical surface portion of the spherical rolling element at both ends of the axis, which is very prone to spin sliding friction, in parallel. The spherical rolling element is arranged in a deep groove spherical rolling element track arranged in the middle of the inner circumference of the outer ring. The spherical rolling element passes through the pockets of the spherical rolling element of the cross-cross rolling element cage, so that the spherical rolling element forms a cross-cross four-point contact ball bearing structure in the deep groove spherical rolling element track.

[0017] The double half inner rings are respectively provided with a circle of double half angular contact spherical rolling body tracks at the inner ends of the outer circumference, and the double half inner rings are coaxially arranged on both sides of the inner circumference of the outer ring, and are respectively combined with the spherical rolling bodies arranged in a cross-four-point contact manner in the deep groove spherical rolling body tracks in the middle of the inner circumference of the outer ring to form a cross-four-point contact ball bearing structure with spherical cut spherical rolling bodies.

[0018] A cross-shaped four-point contact ball bearing with spherically cut spherical rolling elements comprises an inner ring, a cross-shaped rolling element retainer, a spherically cut spherical rolling element, and two half outer rings. The characteristic feature is that the spherical tops of the spherical surface portions at both ends of the rotation axis are cut away in parallel to form a spherically cut spherical rolling element structure. The spherically cut spherical rolling element is arranged in a circle of deep groove spherical rolling element tracks provided in the middle of the outer circumference of the inner ring. The spherically cut spherical rolling element forms a cross-shaped four-point contact ball bearing structure under the action of the cross-shaped retainer.

[0019] The inner ring is provided with a circle of deep groove spherical rolling element track in the middle of its outer circumference, and a circle of cross rolling element retainer sliding groove is provided along the circumferential center line of the deep groove spherical rolling element track in the middle of the outer circumference of the inner ring.

[0020] The pockets of the cross-cross rolling element cage are spherical rolling element pockets with a spherical cut shape. The spherical cut spherical rolling element pockets are arranged at 90 degrees along the center line of the cage circumference. 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 deep groove spherical rolling element tracks arranged in the middle of the outer circumference of the inner ring.

[0021] The spherical cutting spherical rolling element is formed by cutting off the top of the spherical surface portion of the spherical rolling element at both ends of the axis, which is very likely to generate spin sliding friction, in parallel, to form a spherical cutting spherical rolling element structure. The spherical cutting spherical rolling element is arranged in a deep groove spherical rolling element track arranged in the middle of the outer circumference of the inner ring. The spherical cutting spherical rolling element passes through the pockets of the spherical cutting spherical rolling element of the cross rolling element cage, so that the spherical cutting spherical rolling element forms a cross four-point contact ball bearing structure in the deep groove spherical rolling element track.

[0022] The double half outer rings are respectively provided with a circle of double half angular contact spherical rolling body tracks at the inner ends of the inner circumference, and the double half outer rings are coaxially arranged on both sides of the outer circumference of the inner ring, and are respectively combined with the spherical rolling bodies arranged in a cross-cross four-point contact manner in the deep groove spherical rolling body tracks in the middle of the outer circumference of the inner ring through the double half angular contact spherical rolling body tracks provided at the inner ends of the inner circumference, to form a cross-cross four-point contact ball bearing structure with spherical cut spherical rolling bodies.

[0023] A cross-cross four-point contact ball bearing with spherically cut spherical rolling elements comprises an outer ring, a cross-cross rolling element retainer, spherically cut spherical rolling elements, and a double-half inner ring. The outer ring is characterized in that a circle of cross-cross elliptical spherical roller tracks is provided in the middle of its inner circumference. The curvature radius of the cross-cross elliptical spherical roller tracks is greater than the radius of the circumferential track of the elliptical spherical roller bearing. The cross-cross rolling element retainer and the cross-cross spherically cut spherical rolling elements are provided within the cross-cross elliptical spherical roller tracks.

[0024] 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 circumferential track of the elliptical spherical roller bearing. 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.

[0025] The pockets of the cross-cross rolling element cage are spherically cut spherical rolling element pockets. The spherically cut spherical rolling element pockets are arranged at 90 degrees along the center line of the cage circumference. A circle of sliding positioning guide rails is 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.

[0026] The spherical cutting spherical rolling element 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 element, thereby forming a spherical cutting spherical rolling element structure. The spherical cutting spherical rolling element is arranged in a cross-elliptical spherical roller track arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling element passes through the pockets of the spherical cutting spherical rolling element of the cross-elliptical spherical roller cage, thereby forming a cross-cross four-point contact ball bearing structure in the cross-cross elliptical spherical roller track.

[0027] The double half inner rings are respectively provided with a circle of double half elliptical spherical roller tracks at the inner ends of the outer circumference, and the double half inner rings are coaxially arranged on both sides of the inner circumference of the outer ring, and are respectively combined with the spherically cut spherical rolling bodies arranged in a cross-cross four-point contact manner in the cross-cross elliptical spherical roller tracks in the middle of the inner circumference of the outer ring to form a cross-cross four-point contact ball bearing structure with spherically cut spherical rolling bodies.

[0028] A cross-cross four-point contact ball bearing with spherically cut spherical rolling elements comprises an inner ring, a cross-cross rolling element retainer, spherically cut spherical rolling elements, and two half outer rings. The inner ring is characterized in that a circle of cross-cross elliptical spherical roller tracks is provided in the middle of its outer circumference. The curvature radius of the cross-cross elliptical spherical roller tracks is greater than the radius of the circumferential track of the elliptical spherical roller bearing. The cross-cross rolling element retainer and the cross-cross spherically cut spherical rolling elements are provided in the cross-cross elliptical spherical roller tracks.

[0029] 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 circumferential track of the elliptical spherical roller bearing. 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.

[0030] The pockets of the cross-cross rolling element cage are spherically cut spherical rolling element pockets. The spherically cut spherical rolling element pockets are arranged at 90 degrees along the center line of the cage circumference. A circle of sliding positioning guide rails is 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.

[0031] The spherical cutting spherical rolling element 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 element, thereby forming a spherical cutting spherical rolling element structure. The spherical cutting spherical rolling element is arranged in a cross-elliptical spherical roller track arranged in the middle of the outer circumference of the inner ring. The spherical cutting spherical rolling element passes through the pockets of the spherical cutting spherical rolling element of the cross-elliptical spherical roller cage, thereby forming a cross-four-point contact ball bearing structure in the cross-elliptical spherical roller track.

[0032] 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 double half outer rings are coaxially arranged on both sides of the outer circumference of the inner ring, and are respectively combined with the spherically cut spherical rolling bodies arranged in a cross-cross four-point contact manner within the double semi-elliptical spherical roller tracks arranged at the inner end of the inner circumference and the cross-cross elliptical spherical roller tracks in the middle of the outer circumference of the inner ring, to form a cross-cross four-point contact ball bearing structure with spherically cut spherical rolling bodies.

[0033] The cross-shaped four-point contact ball bearing with spherically cut spherical rolling elements is characterized in that: the spherically cut spherical rolling elements are provided with an axial center hole along the axis of the spherically cut spherical rolling elements.

[0034] 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.

[0035] The beneficial effect of the cross-four-point contact ball bearing provided with spherically cut spherical rolling elements of the present invention is that the spherical surface portions of the spherical rolling elements of the four-point contact ball bearing, which are extremely prone to sliding friction outside the two-point contact, are cut away along the ball tops at both ends of the axis to form a cross-four-point contact spherically cut spherical rolling element bearing structure, thus overcoming the limitation of the four-point contact ball bearing that can only bear axial loads in one direction under the condition of two-point contact.

[0036] The creation of the cross-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 equipped with a cross-cross rolling element cage has a higher operating speed. Under the action of the cross-cross cage, each spherical cutting spherical rolling element can form a cross-cross stress state under the good conditions of two-point contact, pure rolling friction and no rotational friction, and can withstand alternating pure axial loads and combined loads at the same time. It not only has the advantages of high rigidity, pure rolling, no rotational friction, uniform stress and ability to withstand combined loads 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 can select the axial clearance of the bearing between zero and negative axial clearance, and is the best choice for slewing bearings of various joints of high-precision, high-speed equipment or high-precision, high-speed robots. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The present invention is a structural schematic diagram of a deep groove spherical rolling element track provided in the middle of the inner circumference of the outer ring, and a cross-spherical cut spherical rolling element provided in the deep groove spherical rolling element track.

[0038] Figure 2 The present invention provides a structural schematic diagram of a deep groove spherical rolling element track in the middle of the outer circumference of the inner ring, and a cross-spherical cut spherical rolling element is provided in the deep groove spherical rolling element track.

[0039] Figure 3 This is a structural diagram of a cross-elliptical spherical roller track arranged in the middle of the inner circumference of the outer ring of the present invention, and a cross-spherical cut spherical rolling body arranged in the cross-elliptical spherical roller track (in the figure: R1 is the radius of the bearing circumferential track, and R2 is the curvature radius of the raceway).

[0040] Figure 4 The diagram is a structural diagram of a cross-elliptical spherical roller track provided in the middle of the outer circumference of the inner ring of the present invention, and a cross-spherical cut spherical rolling body provided in the cross-elliptical spherical roller track.

[0041] Figure 5 This is a structural schematic diagram of the present invention, in which axial pin holes are set on both sides of the cross-cross retainer pocket in the cross-cross elliptical spherical roller track in the middle of the inner circumference of the outer ring along the axis of the elliptical spherical roller, and the spherical cut spherical rolling body with the axial hole is combined (in the figure: R1 is the radius of the bearing circumferential track, R2 is the curvature radius of the raceway).

[0042] Figure 6 It is a structural schematic diagram of the spherical rolling body of the present invention.

[0043] Figure 7 This is a schematic structural diagram of a spherical rolling body with a spherical cut shape and an axial hole provided in the present invention.

[0044] Figure 8 It is a structural schematic diagram of the cross cage of the present invention.

[0045] Figure 9 The figure is a schematic structural diagram of a cross-crossed spherical rolling element arranged in a cross-crossed cage according to the present invention.

[0046] Figure 10 This is a structural schematic diagram of a cross rolling element cage of the present invention in which axis pin holes are arranged on both sides of the pocket along the axis of the spherically cut spherical rolling element.

[0047] Figure 11 It is a schematic diagram of the combined structure of a spherical rolling body with an axial hole arranged along the axis and a cross rolling body retainer with axial pin holes arranged on both sides of the pocket along the axis of the spherical rolling body of the present invention.

[0048] Figure 12 It is a structural schematic diagram of the cross-elliptical spherical roller track of the present invention.

[0049] Figure 13 Schematic diagram of the relationship between the curvature radius of the elliptical spherical roller track of the present invention and the bearing circumferential radius (in the figure: R1 is the bearing circumferential track radius, R2 is the curvature radius of the raceway).

[0050] In the figure: 1, outer ring, 2, cross rolling element retainer, 3, spherical cutting spherical rolling element, 4, double half inner ring, 1-1 deep groove spherical rolling element track, 1-2 cross rolling element retainer sliding groove, 2-1, spherical cutting spherical rolling element pocket, 2-2, sliding positioning guide, 4-1, double half angular contact spherical rolling element track, 5, inner ring, 6, double half outer ring, 7, cross elliptical spherical roller track, 8, double half elliptical spherical roller track, 3-1, axis hole, 9, axis pin hole, 10, axis pin. DETAILED DESCRIPTION

[0051] 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.

[0052] Example 1:

[0053] like Figure 1 The cross four-point contact ball bearing with spherically cut spherical rolling elements shown in the figure comprises: an outer ring 1, a cross rolling element retainer 2, a spherically cut spherical rolling element 3 and a double half inner ring 4.

[0054] A circle of deep groove spherical rolling element track 1-1 is set in the middle of the inner circumference of the outer ring 1, and a circle of cross rolling element cage sliding groove 1-2 is set along the circumferential center line of the deep groove spherical rolling element track 1-1 in the middle of the inner circumference of the outer ring 1.

[0055] The pockets of the cross-cross rolling element cage 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 center line of the cage circumference. A circle of sliding positioning guide rails 2-2 are respectively arranged along the center line of the inner and outer circumferences of the cross-cross rolling element cage 2. The cross-cross rolling element cage 2 is arranged in a circle of deep groove spherical rolling element tracks 1-1 arranged in the middle of the inner circumference of the outer ring 1.

[0056] 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 extremely prone to spin sliding friction. The spherical rolling element 3 is arranged in the deep groove spherical rolling element track 1-1 in the middle of the inner circumference of the outer ring 1. The spherical rolling element 3 passes through the pockets 2-1 of the spherical rolling element of the cross-cross rolling element cage 2, so that the spherical rolling element 3 forms a cross-cross four-point contact ball bearing structure in the deep groove spherical rolling element track 1-1.

[0057] A circle of double half-angular contact spherical rolling body track 4-1 is respectively set at the inner end of the outer circumference of the double half inner ring 4, and the double half inner ring 4 is coaxially set on both sides of the inner circumference of the outer ring 1, and is respectively combined with the spherical rolling body 3 with a cross-cross four-point contact setting in the deep groove spherical rolling body track 1-1 in the middle of the inner circumference of the outer ring 1 through the double half-angular contact spherical rolling body track 4-1 set at the inner end of the outer circumference, to form a cross-cross four-point contact ball bearing structure with spherical cut spherical rolling bodies.

[0058] Example 2:

[0059] like Figure 2 The cross four-point contact ball bearing with spherically cut spherical rolling elements shown in the figure comprises: an inner ring 5, a cross rolling element retainer 2, a spherically cut spherical rolling element 3 and a double half outer ring 6.

[0060] A circle of deep groove spherical rolling element track 1-1 is set in the middle of the outer circumference of the inner ring 5, and a circle of cross rolling element cage sliding groove 1-2 is set along the circumferential center line of the deep groove spherical rolling element track 1-1 in the middle of the outer circumference of the inner ring 5.

[0061] The pockets of the cross-cross rolling element cage 2 are spherically cut spherical rolling element pockets 2-1. The spherically cut spherical rolling element pockets 2-1 are arranged at 90 degrees on both sides of the cage's circumferential centerline. 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 deep groove spherical rolling element tracks 1-1 arranged in the middle of the outer circumference of the inner ring 5.

[0062] 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 extremely prone to spin sliding friction. The spherical rolling element 3 is arranged in the deep groove spherical rolling element track 1-1 in the middle of the outer circumference of the inner ring 5. The spherical rolling element 3 passes through the pockets 2-1 of the spherical rolling element of the cross-cross rolling element cage 2, so that the spherical rolling element 3 forms a cross-cross four-point contact ball bearing structure in the deep groove spherical rolling element track 1-1.

[0063] A circle of double half-angular contact spherical rolling body track 4-1 is respectively set at the inner end of the inner circumference of the double half-outer ring 6, and the double half-angular contact spherical rolling body track 4-1 set at the inner end of the inner circumference is combined with the spherical rolling body 3 set in a cross-four-point contact manner within the deep groove spherical rolling body track 1-1 in the middle of the outer circumference of the inner ring 5 to form a cross-four-point contact ball bearing structure with spherical cut spherical rolling bodies.

[0064] Example 3:

[0065] like Figure 3 The cross four-point contact ball bearing with spherically cut spherical rolling elements shown in the figure comprises: an outer ring 1, a cross rolling element retainer 2, a spherically cut spherical rolling element 3 and a double half inner ring 4.

[0066] A circle of cross-cross elliptical spherical roller track 7 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 7 is a structure of two groups of cross-crossed elliptical spherical roller tracks. The curvature radius of the cross-cross elliptical spherical roller track 7 is greater than the radius of the circumferential track of the elliptical spherical roller bearing. A circle of cross-cross rolling element cage sliding grooves 1-2 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 7.

[0067] The pockets of the cross-cross rolling element cage 2 are spherically cut spherical rolling element pockets 2-1. The spherically cut spherical rolling element pockets 2-1 are arranged at 90 degrees on both sides of the cage's circumferential centerline. 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 7 arranged in the middle of the inner circumference of the outer ring 1.

[0068] 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 extremely prone to spin sliding friction. The spherical rolling element 3 is arranged in the cross-elliptical spherical roller track 7 in the middle of the inner circumference of the outer ring 1. The spherical rolling element 3 passes through the pockets 2-1 of the spherical rolling element of the cross-elliptical spherical roller cage 2, so that the spherical rolling element 3 forms a cross-four-point contact ball bearing structure in the cross-elliptical spherical roller track 7.

[0069] A circle of double semi-elliptical spherical roller tracks 8 is respectively arranged at the inner end of the outer circumference of the double semi-inner ring 4, and the double semi-elliptical spherical roller tracks 8 arranged at the inner end of the outer circumference are coaxially arranged on both sides of the inner circumference of the outer ring 1, and the spherical rolling bodies 3 arranged in a cross-cross four-point contact manner are combined with the double semi-elliptical spherical roller tracks 8 arranged at the inner end of the outer circumference and the cross-cross elliptical spherical roller tracks 7 in the middle of the inner circumference of the outer ring 1 to form a cross-cross four-point contact ball bearing structure with spherical cut spherical rolling bodies.

[0070] Example 4:

[0071] like Figure 4 The cross four-point contact ball bearing with spherically cut spherical rolling elements shown in the figure comprises: an inner ring 5, a cross rolling element retainer 2, a spherically cut spherical rolling element 3 and a double half outer ring 6.

[0072] A circle of cross-elliptical spherical roller track 7 is set in the middle of the outer circumference of the inner ring 5. The axial section of the cross-elliptical spherical roller track 7 is a structure of two groups of cross-elliptical spherical roller tracks. The curvature radius of the cross-elliptical spherical roller track 7 is greater than the radius of the circumferential track of the elliptical spherical roller bearing. A circle of cross-rolling element cage sliding grooves 1-2 is set in the middle of the outer circumference of the inner ring 5 along the circumferential center line of the cross-elliptical spherical roller track 8.

[0073] The pockets of the cross-cross rolling element cage 2 are spherically cut spherical rolling element pockets 2-1. The spherically cut spherical rolling element pockets 2-1 are arranged at 90 degrees on both sides of the cage's circumferential centerline. 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 7 arranged in the middle of the outer circumference of the inner ring 5.

[0074] The spherical rolling element 3 is formed by cutting off the top of the spherical surface portion of the spherical rolling element along both ends of the axis, which is extremely prone to spin sliding friction. The spherical rolling element 3 is arranged in the cross-elliptical spherical roller track 7 in the middle of the outer circumference of the inner ring 5. The spherical rolling element 3 passes through the pockets 2-1 of the spherical rolling element of the cross-elliptical spherical roller cage 2, so that the spherical rolling element 3 forms a cross-four-point contact ball bearing structure in the cross-elliptical spherical roller track 7.

[0075] A circle of double semi-elliptical spherical roller tracks 8 are respectively set at the inner end of the inner circumference of the double semi-outer ring 6. The double semi-outer ring 6 is coaxially set on both sides of the outer circumference of the inner ring 5, and is respectively combined with the spherical rolling body 3 set in a cross-cross four-point contact arrangement through the double semi-elliptical spherical roller tracks 8 set at the inner end of the inner circumference and the cross-cross elliptical spherical roller track 7 in the middle of the outer circumference of the inner ring 5, forming a cross-cross four-point contact ball bearing structure with a spherical cutting spherical rolling body.

[0076] Example 5:

[0077] As shown in the figure, a cross-shaped four-point contact ball bearing with spherically cut spherical rolling elements comprises: an inner ring 5, a cross-shaped rolling element retainer 2, a spherically cut spherical rolling element 3 and a double half outer ring 6.

[0078] A circle of cross-elliptical spherical roller track 7 is set in the middle of the outer circumference of the inner ring 5. The axial section of the cross-elliptical spherical roller track 7 is a structure of two groups of cross-elliptical spherical roller tracks. The curvature radius of the cross-elliptical spherical roller track 7 is greater than the radius of the circumferential track of the elliptical spherical roller bearing. A circle of cross-rolling element cage sliding grooves 1-2 is set in the middle of the outer circumference of the inner ring 5 along the circumferential center line of the cross-elliptical spherical roller track 8.

[0079] The pockets of the cross-cross rolling element cage 2 are spherically cut spherical rolling element pockets 2-1. Axis pin holes 9 are provided on the coaxial center lines on both sides of the pockets along the axis of the spherically cut spherical rolling element. The spherically cut spherical rolling element pockets 2-1 are cross-arranged at 90-degree intervals on both sides of the cage circumferential center line. A circle of sliding positioning guide rails 2-2 are provided along the inner and outer circumferential center lines of the cross-cross rolling element cage 2. The cross-cross rolling element cage 2 is provided in a circle of cross-cross elliptical spherical roller tracks 7 provided in the middle of the outer circumference of the inner ring 5.

[0080] The spherical rolling element 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 element along the axis, forming a spherical rolling element 3 structure. An axial hole 3-1 is set along the axis of the spherical rolling element. The spherical rolling element 3 is set in the cross-cross elliptical spherical roller track 7 in the middle of the outer circumference of the inner ring 5. The spherical rolling element 3 passes through the pockets 2-1 of the spherical rolling element of the cross-cross rolling element retainer 2, so that the spherical rolling element 3 forms a cross-cross four-point contact ball bearing structure in the cross-cross elliptical spherical roller track 7. The spherical rolling element 3 and the cross-cross rolling element retainer 2 are connected by an axial pin hole 9 set on both sides of the coaxial center line of the axial hole 3-1 of the spherical rolling element 3 and the pocket 2-1 of the spherical rolling element of the cross-cross rolling element retainer, and the axial pin 10 is used to form a rotation positioning.

[0081] A circle of double semi-elliptical spherical roller tracks 8 are respectively set at the inner end of the inner circumference of the double semi-outer ring 6. The double semi-outer ring 6 is coaxially set on both sides of the outer circumference of the inner ring 5, and is respectively combined with the spherical rolling body 3 set in a cross-cross four-point contact arrangement through the double semi-elliptical spherical roller tracks 8 set at the inner end of the inner circumference and the cross-cross elliptical spherical roller track 7 in the middle of the outer circumference of the inner ring 5, forming a cross-cross four-point contact ball bearing structure with a spherical cutting spherical rolling body.

Claims

1. A cross-shaped four-point contact ball bearing provided with spherically cut spherical rolling elements, comprising: The outer ring, cross rolling element cage, spherically cut spherical rolling element and double half inner ring are characterized in that the top of the spherical surface of the spherical rolling element at both ends of the rotation axis is cut off in parallel to form a spherically cut spherical rolling element structure. The spherically cut spherical rolling element is arranged in a circle of deep groove spherical rolling element tracks arranged in the middle of the inner circumference of the outer ring. The spherically cut spherical rolling element forms a cross four-point contact ball bearing structure under the action of the cross rolling element cage. The outer ring is provided with a circle of deep groove spherical rolling element tracks in the middle of its inner circumference, and a circle of cross rolling element retainer sliding grooves is provided along the circumferential center line of the deep groove spherical rolling element tracks in the middle of the inner circumference of the outer ring. The pockets of the cross-cross rolling element cage are spherical rolling element pockets with a spherical cut shape. The spherical cut spherical rolling element pockets 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 deep groove spherical rolling element tracks arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling element is formed by cutting off the top of the spherical surface portion of the spherical rolling element at both ends of the axis, which is very likely to generate spin sliding friction, in parallel, to form a spherical cutting spherical rolling element structure. The spherical cutting spherical rolling element is arranged in a deep groove spherical rolling element track arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling element passes through the pockets of the spherical cutting spherical rolling element of the cross rolling element cage, so that the spherical cutting spherical rolling element forms a cross four-point contact ball bearing structure in the deep groove spherical rolling element track. The double half inner rings are respectively provided with a circle of double half angular contact spherical rolling body tracks at the inner ends of the outer circumference, and the double half inner rings are coaxially arranged on both sides of the inner circumference of the outer ring, and are respectively combined with the spherical rolling bodies arranged in a cross-four-point contact manner in the deep groove spherical rolling body tracks in the middle of the inner circumference of the outer ring to form a cross-four-point contact ball bearing structure with spherical cut spherical rolling bodies.

2. A cross-shaped four-point contact ball bearing provided with spherically cut spherical rolling elements, comprising: The inner ring, cross rolling element cage, spherically cut spherical rolling element and double half outer ring are characterized in that the top of the spherical surface of the spherical rolling element at both ends of the rotation axis is cut off in parallel to form a spherically cut spherical rolling element structure. The spherically cut spherical rolling element is arranged in a circle of deep groove spherical rolling element tracks arranged in the middle of the outer circumference of the inner ring. The spherically cut spherical rolling element forms a cross four-point contact ball bearing structure under the action of the cross cage. The inner ring is provided with a circle of deep groove spherical rolling element track in the middle of its outer circumference, and a circle of cross rolling element retainer sliding groove is provided along the circumferential center line of the deep groove spherical rolling element track in the middle of the outer circumference of the inner ring. The pockets of the cross-cross rolling element cage are spherical rolling element pockets with a spherical cut shape. The spherical cut spherical rolling element pockets 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 deep groove spherical rolling element tracks arranged in the middle of the outer circumference of the inner ring. The spherical cutting spherical rolling element is formed by cutting off the top of the spherical surface portion of the spherical rolling element at both ends of the axis, which is very likely to generate spin sliding friction, in parallel, to form a spherical cutting spherical rolling element structure. The spherical cutting spherical rolling element is arranged in a deep groove spherical rolling element track arranged in the middle of the outer circumference of the inner ring. The spherical cutting spherical rolling element passes through the pockets of the spherical cutting spherical rolling element of the cross rolling element cage, so that the spherical cutting spherical rolling element forms a cross four-point contact ball bearing structure in the deep groove spherical rolling element track. The double half outer rings are respectively provided with a circle of double half angular contact spherical rolling body tracks at the inner ends of the inner circumference, and the double half outer rings are coaxially arranged on both sides of the outer circumference of the inner ring, and are respectively combined with the spherical rolling bodies arranged in a cross-cross four-point contact manner in the deep groove spherical rolling body tracks in the middle of the outer circumference of the inner ring through the double half angular contact spherical rolling body tracks provided at the inner ends of the inner circumference, to form a cross-cross four-point contact ball bearing structure with spherical cut spherical rolling bodies.

3. A cross-shaped four-point contact ball bearing provided with spherically cut spherical rolling elements, comprising: The outer ring, cross rolling element cage, spherically cut spherical rolling element and double half inner ring are characterized in that: the outer ring is provided with a circle of cross-cross elliptical spherical roller track in the middle of its inner circumference, the curvature radius of the cross-cross elliptical spherical roller track is greater than the radius of the circumferential track of the elliptical spherical roller bearing, and the cross-cross rolling element cage and cross-cross spherically cut spherical rolling element are provided in 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 circumferential track of the elliptical spherical roller bearing. 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. The pockets of the cross-cross rolling element cage are spherical rolling element pockets with a spherical cut shape. The spherical cut spherical rolling element pockets 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 inner circumference of the outer ring. The spherical cutting spherical rolling element 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 element, thereby forming a spherical cutting spherical rolling element structure. The spherical cutting spherical rolling element is arranged in a cross-elliptical spherical roller track arranged in the middle of the inner circumference of the outer ring. The spherical cutting spherical rolling element passes through the pockets of the spherical cutting spherical rolling element of the cross-elliptical spherical roller cage, thereby forming a cross-cross four-point contact ball bearing structure in the cross-cross elliptical spherical roller track. The double half inner rings are respectively provided with a circle of double half elliptical spherical roller tracks at the inner ends of the outer circumference, and the double half inner rings are coaxially arranged on both sides of the inner circumference of the outer ring, and are respectively combined with the spherically cut spherical rolling bodies arranged in a cross-cross four-point contact manner in the cross-cross elliptical spherical roller tracks in the middle of the inner circumference of the outer ring to form a cross-cross four-point contact ball bearing structure with spherically cut spherical rolling bodies.

4. A cross-shaped four-point contact ball bearing provided with spherically cut spherical rolling elements, comprising: The inner ring, cross rolling element cage, spherical cut spherical rolling element and double half outer ring are characterized in that: the inner ring is provided with a circle of cross-cross elliptical spherical roller track in the middle of its outer circumference, the curvature radius of the cross-cross elliptical spherical roller track is greater than the radius of the circumferential track of the elliptical spherical roller bearing, and the cross-cross rolling element cage and cross-cross spherical cut spherical rolling element are provided in 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 circumferential track of the elliptical spherical roller bearing. 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. The pockets of the cross-cross rolling element cage are spherically cut spherical rolling element pockets. The spherically cut spherical rolling element pockets are arranged at 90 degrees on both 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 outer circumference of the inner ring. The spherical cutting spherical rolling element 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 element, thereby forming a spherical cutting spherical rolling element structure. The spherical cutting spherical rolling element is arranged in a cross-elliptical spherical roller track arranged in the middle of the outer circumference of the inner ring. The spherical cutting spherical rolling element passes through the pockets of the spherical cutting spherical rolling element of the cross-elliptical spherical roller cage, thereby forming a cross-four-point contact ball bearing structure in the cross-elliptical spherical roller 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 double half outer rings are coaxially arranged on both sides of the outer circumference of the inner ring, and are respectively combined with the spherically cut spherical rolling bodies arranged in a cross-cross four-point contact manner within the double semi-elliptical spherical roller tracks arranged at the inner end of the inner circumference and the cross-cross elliptical spherical roller tracks in the middle of the outer circumference of the inner ring, to form a cross-cross four-point contact ball bearing structure with spherically cut spherical rolling bodies.

5. A cross four-point contact ball bearing with spherically cut spherical rolling elements according to any one of claims 1 to 4, characterized in that: The spherical rolling body is provided with an axial center 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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