Four-point contact release bearing unit
By designing a four-point contact separation bearing unit, the multi-point contact between the rolling ball and the outer ring and the inner ring channel is increased, the problems of large bearing squirting and serious heating in the existing technology are solved, and the stability of high-speed rotation is achieved Extended operation and sealing life.
Patent Information
- Application Number
- CN202421287354.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-06-06
AI Technical Summary
The existing separation bearing units use centripetal angular contact ball bearings, resulting in large axial radial momentum, unstable operation during high-speed rotation, and severe heat generated by the bearings, and the grease and rubber seals are prone to aging and fail early.
A four-point contact separation bearing unit is designed. The rolling ball has two contact points each with the outer ring channel and the inner ring channel. The contact force is opposite in the axial direction, which increases the contact angle of the channel and reduces the normal force. Multi-arc profile design to support rolling spheres, optimized sealing structure to reduce heat generation and grease leakage.
It effectively reduces the axial momentum of the bearing rotating ring, ensures smooth operation during high-speed rotation, suppresses abnormal noise, extends the seal service life, and reduces bearing heating.
Smart Images
Figure CN222277212U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to automobile transmission components, in particular to a four-point contact separation bearing unit. Background Art
[0002] The existing release bearing unit is basically a combination structure of a release bearing and other accessories. The release bearings all adopt radial angular contact ball bearings.
[0003] Since the contact angle of the groove of the radial angular contact ball bearing is small, when the bearing is subjected to the same axial force, the smaller the contact angle, the greater the normal force of the bearing groove. The greater the normal force, the more serious the bearing heats up, and the grease and rubber seal in the bearing are more likely to age and fail early. If the groove contact angle is increased, due to the existence of the end runout error of the separation pressure plate, sometimes the bearing will not be fully axially loaded, resulting in the axial position of the rotating ring of the separation bearing (the ring that contacts the pressure plate and can rotate with the pressure plate, which can be the inner ring or the outer ring) to move more violently, which will cause abnormal noise of the bearing, increased grease leakage, and even early failure when rotating. Utility Model Content
[0004] The technical problem to be solved and the technical task proposed by the utility model are to overcome the defects of large axial movement and unstable operation during high-speed rotation caused by the radial angular contact ball bearings of the separation bearings of the existing separation bearing units, to provide a four-point contact separation bearing unit, and to further overcome the defects of serious bearing heating and premature failure caused by aging of grease and rubber seals in the bearings.
[0005] In order to achieve the above-mentioned purpose, the four-point contact separation bearing unit of the utility model comprises a bearing and a base assembled together, the bearing comprises an outer ring, an inner ring, a rolling ball and a retaining frame, the outer ring has an outer ring groove, the inner ring has an inner ring groove, the outer ring groove and the inner ring groove are kept corresponding in the radial direction, the rolling ball is constrained by the retaining frame and contacts the outer ring groove and the inner ring groove, and is characterized in that:
[0006] The rolling ball and the outer raceway have a first contact point and a second contact point, and the contact force of the outer raceway on the rolling ball at the first contact point is opposite to the contact force of the outer raceway on the rolling ball at the second contact point in the axial direction;
[0007] The rolling ball has a third contact point and a fourth contact point with the inner raceway, and the contact force of the inner raceway on the rolling ball at the third contact point is axially opposite to the contact force of the inner raceway on the rolling ball at the fourth contact point.
[0008] In the existing radial angular contact ball bearings, the rolling ball has only one contact point with the inner raceway and the outer raceway, while the inner raceway and the outer raceway of the rolling ball of the utility model have two contact points respectively, thus forming a separation bearing unit with four-point contact of the rolling ball.
[0009] The four-point contact ball bearing greatly reduces the axial play (axial clearance) of the bearing rotating ring. Even if the separation pressure plate end runout error is large and even if the bearing is not fully axially loaded, the bearing rotating ring can still run smoothly at high speed, suppressing abnormal noise and reducing grease leakage.
[0010] Furthermore, the force contact angle of the bearing groove can be increased. When the bearing is subjected to the same axial force, the larger the contact angle, the smaller the normal force of the bearing groove. The smaller the normal force, the less heat the bearing generates, and the longer the service life of the grease and rubber seal in the bearing.
[0011] Preferably, the axial cross-sectional profile of the outer ring groove includes a first arc and a second arc, the rolling ball contacts the first arc at a first contact point, and the rolling ball contacts the second arc at a second contact point; the axial cross-sectional profile of the inner ring groove includes a third arc and a fourth arc, the rolling ball contacts the third arc at a third contact point, and the rolling ball contacts the fourth arc at a fourth contact point. Accordingly, it is equivalent to having two outer ring grooves and two inner ring grooves to support the rolling ball, so that the rolling ball can run smoothly even at high speed, suppress abnormal noise, and reduce grease leakage.
[0012] According to different installation working occasions of the separation bearing unit, the curvature radius of the first arc is the same as or different from the second arc; the curvature radius of the third arc is the same as or different from the fourth arc. Thus, the rolling ball obtains the required supporting force from the outer ring groove and the inner ring groove.
[0013] In order to constrain the rolling ball and enable the rolling ball to reliably contact the outer ring groove and the inner ring groove, the curvature radius of the first arc, the second arc, the third arc and the fourth arc is 0.51-0.60 times the diameter of the rolling ball.
[0014] Preferably, the intersection of the first arc and the second arc is located at the maximum diameter of the axial section profile of the outer ring channel; the intersection of the third arc and the fourth arc is located at the minimum diameter of the axial section profile of the inner ring channel. The groove formed at the intersection can contain lubricating grease, avoid contact with the rolling ball, and reduce the heating of the bearing.
[0015] Furthermore, when the rolling ball contacts the outer raceway at the first contact point and the second contact point, a first hollow portion is maintained between the first arc, the second arc and the rolling ball; when the rolling ball contacts the inner raceway at the third contact point and the fourth contact point, a second hollow portion is maintained between the third arc, the fourth arc and the rolling ball. When the rolling ball rolls, the first hollow portion and the second hollow portion can allow grease to flow, which is beneficial to heat dissipation and reduces bearing heating.
[0016] Depending on the installation working environment of the separation bearing unit, the outer ring groove and the inner ring groove can be kept facing each other in the axial direction, or the outer ring groove and the inner ring groove can be kept offset in the axial direction.
[0017] Specifically, one of the outer ring and the inner ring is a fixed ring, and the other is a rotating ring. Based on this, the outer ring can be set as a fixed ring and the inner ring as a rotating ring according to the installation requirements of the release bearing unit, or the inner ring can be set as a fixed ring and the outer ring as a rotating ring. Among them, the ring that does not rotate during operation is called a fixed ring, and the ring that rotates during operation is called a rotating ring.
[0018] In order to improve the sealing performance, a seal is assembled on the outer ring, and the seal maintains a rotating seal with the inner ring.
[0019] The utility model makes the rolling ball have two contact points with the outer ring groove and the inner ring groove, and the contact force of the same groove on the rolling ball at its two contact points tends to be in the opposite direction of the axial direction, thereby forming a separation bearing unit with four-point contact of the rolling ball. The axial movement (axial clearance) of the bearing rotating ring is greatly reduced. Even if the end runout error of the separation pressure plate is large, even if the bearing is not fully axially loaded, the bearing rotating ring can still run smoothly at high speed, suppressing abnormal noise and reducing grease leakage.
[0020] Furthermore, the force contact angle of the bearing groove can be increased. When the bearing is subjected to the same axial force, the larger the contact angle, the smaller the normal force of the bearing groove. The smaller the normal force, the less heat the bearing generates, and the longer the service life of the grease and rubber seal in the bearing. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic diagram of an axial section of a four-point contact separation bearing unit of the utility model;
[0022] Figure 2 This is a structural schematic diagram of a bearing of the utility model;
[0023] Figure 3 It is a schematic diagram of the outer sleeve of the utility model;
[0024] Figure 4 It is a schematic diagram of the rolling ball of the utility model contacting the outer ring groove;
[0025] Figure 5 It is a schematic diagram of the inner ferrule of the utility model;
[0026] Figure 6 It is a schematic diagram of the rolling ball of the utility model contacting the inner raceway;
[0027] Figure 7It is a structural schematic diagram of another bearing of the utility model;
[0028] Description of the numbers in the figure:
[0029] 100Bearings:
[0030] 110 outer ring, 111 outer ring groove, 112 first arc, 113 second arc, A first contact point, B second contact point, E intersection of the first arc and the second arc,
[0031] 120 inner ring, 121 inner ring groove, 122 third arc, 123 fourth arc, C third contact point, D fourth contact point, F intersection of the third arc and the fourth arc,
[0032] 130 rolling sphere,
[0033] 140 cage,
[0034] 151 first hollow part, 152 second hollow part,
[0035] 161 first sealing member, 162 second sealing member, 163 third sealing member, 164 dust cover;
[0036] 200 bases. DETAILED DESCRIPTION
[0037] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0038] The terms "including" and "having" and any variations thereof in the specification and claims of the present utility model are intended to cover non-exclusive inclusions. For example, a method or product comprising a series of technical features is not necessarily limited to those technical features clearly listed, but may also include other technical features that are not clearly listed and can be included in the method or product.
[0039] In the description of the present utility model, it is necessary to understand that the technical features defined by the terms "first", "second" and the like with sequential concepts are only for the purpose of clearly describing the defined technical features so that the defined technical features can be clearly distinguished from other technical features, but do not represent such naming in actual implementation, and therefore cannot be understood as a limitation of the present utility model.
[0040] The present invention is described in detail below in conjunction with specific embodiments and drawings.
[0041] like Figure 1 As shown in FIG. 1 , the four-point contact separation bearing unit comprises a bearing 100 and a base 200 assembled together. Figure 2 As shown, the bearing 100 includes an outer ring 110, an inner ring 120, rolling balls 130 and a cage 140. The outer ring 110 has an outer ring groove 111, the inner ring 120 has an inner ring groove 121, the outer ring groove 111 and the inner ring groove 121 are kept corresponding in the radial direction, and the rolling balls 130 are constrained by the cage 140 and contact the outer ring groove 111 and the inner ring groove 121.
[0042] like Figure 3 As shown, the axial cross-sectional profile of the outer raceway 111 includes a first arc 112 and a second arc 123. Figure 4 As shown, the rolling ball 130 contacts the first arc 112 at a first contact point A, and the rolling ball 130 contacts the second arc 113 at a second contact point B. Figure 7 As shown, the contact force N1 of the outer ring channel 111 on the rolling ball at the first contact point A is axially opposite to the contact force N2 of the outer ring channel on the rolling ball at the second contact point B, that is, the contact force N1 of the outer ring channel on the rolling ball at the first contact point is axially opposite to the contact force N2 of the outer ring channel on the rolling ball at the second contact point.
[0043] like Figure 5 As shown, the axial cross-sectional profile of the inner raceway 121 includes a third arc 122 and a fourth arc 123. Figure 6 As shown, the rolling ball 130 contacts the third arc 122 at the third contact point C, and the rolling ball 130 contacts the fourth arc 123 at the fourth contact point D. Figure 7 As shown, the contact force N3 of the inner ring channel 121 on the rolling ball 130 at the third contact point C is axially opposite to the contact force N4 of the inner ring channel on the rolling ball 130 at the fourth contact point D, that is, the contact force N3 of the inner ring channel on the rolling ball at the third contact point is axially opposite to the contact force N4 of the inner ring channel on the rolling ball at the fourth contact point.
[0044] The contact forces of the first contact point A, the second contact point B, the third contact point C, and the fourth contact point D on the rolling ball 130 are Figure 7In the figure, N1, N2, N3, and N4 are used to represent them, among which N1 and N2, N3 and N4 tend to be in opposite directions in the axial direction, that is, their axial component forces are in opposite directions. Accordingly, when the end runout error of the separation plate causes the inner ring and the outer ring to float in the axial direction, the contact forces N1 and N2, N3 and N4 in opposite directions can limit the amplitude of such floating, reduce the amount of axial movement, ensure smooth operation during high-speed rotation, suppress abnormal noise, and reduce grease leakage. In addition, the contact angle of the bearing groove can be increased. When the bearing is subjected to the same axial force, the larger the contact angle, the smaller the normal force of the bearing groove. The smaller the normal force, the less heat the bearing generates, and the longer the service life of the grease and rubber seal in the bearing.
[0045] The axial section is a section cut by a plane passing through the axis.
[0046] In the illustrated structure, the first arc 112 has the same curvature radius as the second arc 113, and the third arc 122 has the same curvature radius as the fourth arc 123. In other structures, the first arc and the second arc may have different curvature radii, and the third arc and the fourth arc may have different curvature radii.
[0047] In the illustrated structure, the curvature radius of the first arc 112, the second arc 113, the third arc 122 and the fourth arc 123 is 0.51-0.60 times the diameter of the rolling ball. Moreover, the intersection of the first arc 112 and the second arc 113 is located at the maximum diameter of the axial section profile of the outer ring channel 111; the intersection of the third arc 122 and the fourth arc 123 is located at the minimum diameter of the axial section profile of the inner ring channel 121. When the rolling ball 130 contacts the outer ring channel 111 at the first contact point A and the second contact point B, the first hollow part 151 is maintained between the first arc 112, the second arc 123 and the rolling ball 130; when the rolling ball 130 contacts the inner ring channel 121 at the third contact point C and the fourth contact point D, the second hollow part 152 is maintained between the third arc 122, the fourth arc 123 and the rolling ball 130.
[0048] In the illustrated structure, the outer raceway 111 and the inner raceway 121 are axially aligned. In other structures, the outer raceway and the inner raceway may be axially offset.
[0049] The release bearing is composed of two concentric rings, the one with a larger diameter is called the outer ring, and the one with a smaller diameter is called the inner ring. In the illustrated structure, the outer ring 110 is a fixed ring, and the inner ring 120 is a rotating ring. In other structures, the inner ring may be a fixed ring, and the outer ring may be a rotating ring.
[0050] exist Figure 2In the embodiment, the first seal 161 and the second seal 162 are respectively installed at both ends of the outer ring 110, and the first seal and the second seal maintain a rotation seal with both ends of the inner ring 120. The seal and the outer ring can be assembled directly or indirectly. Figure 7 In the structure shown, only the third seal 163 is assembled at the left end of the outer ring 110, and the third seal 163 maintains a rotational seal with the left end of the inner ring 120. In addition, a dust cover 164 is assembled at the left end of the inner ring, and the dust cover is located outside the third seal 163 for dust prevention. When the seal maintains a rotational seal with the inner ring, the seal and the inner ring can be interference fit, transition fit or clearance fit.
Claims
1. A four-point contact separation bearing unit, comprising a bearing (100) and a base (200) assembled together, wherein the bearing (100) comprises an outer ring (110), an inner ring (120), a rolling ball (130) and a retaining frame (140), wherein the outer ring (110) has an outer ring groove (111), the inner ring (120) has an inner ring groove (121), the outer ring groove (111) and the inner ring groove (121) are kept corresponding in radial direction, and the rolling ball (130) is constrained by the retaining frame (140) and contacts the outer ring groove (111) and the inner ring groove (121), wherein: The rolling ball (130) and the outer raceway (111) have a first contact point (A) and a second contact point (B), and the contact force (N1) of the outer raceway (111) on the rolling ball at the first contact point (A) and the contact force (N2) on the rolling ball at the second contact point (B) are opposite in the axial direction; The rolling ball (130) and the inner raceway (121) have a third contact point (C) and a fourth contact point (D), and the contact force (N3) of the inner raceway (121) on the rolling ball at the third contact point (C) and the contact force (N4) on the rolling ball at the fourth contact point (D) are axially opposite.
2. The four-point contact separation bearing unit according to claim 1, characterized in that: The axial cross-sectional profile of the outer raceway (111) includes a first arc (112) and a second arc (113); the rolling ball (130) contacts the first arc (112) at a first contact point (A); and the rolling ball (130) contacts the second arc (113) at a second contact point (B); The axial cross-sectional profile of the inner raceway (121) includes a third arc (122) and a fourth arc (123), the rolling ball (130) contacts the third arc (122) at a third contact point (C), and the rolling ball (130) contacts the fourth arc (123) at a fourth contact point (D).
3. The four-point contact separation bearing unit according to claim 2, characterized in that: The curvature radii of the first circular arc (112) and the second circular arc (113) are the same or different; The curvature radii of the third circular arc (122) and the fourth circular arc (123) are the same or different.
4. The four-point contact separation bearing unit according to claim 2, characterized in that: The curvature radii of the first circular arc (112), the second circular arc (113), the third circular arc (122) and the fourth circular arc (123) are 0.51-0.60 times the diameter of the rolling sphere.
5. The four-point contact separation bearing unit according to claim 2, characterized in that: The intersection point (E) of the first arc (112) and the second arc (113) is located at the maximum diameter of the axial section profile of the outer raceway (111); The intersection point (F) of the third circular arc (122) and the fourth circular arc (123) is located at the minimum diameter of the axial cross-sectional profile of the inner raceway (121).
6. The four-point contact separation bearing unit according to claim 5, characterized in that: When the rolling ball (130) and the outer raceway (111) are in contact at a first contact point and a second contact point, a first hollow portion (151) is maintained between the first arc (112), the second arc (113) and the rolling ball (130); When the rolling ball (130) contacts the inner raceway (121) at the third contact point and the fourth contact point, a second hollow portion (152) is maintained between the third arc (122), the fourth arc (123) and the rolling ball (130).
7. The four-point contact separation bearing unit according to any one of claims 1 to 6, characterized in that: The outer ring groove (111) and the inner ring groove (121) are kept facing each other in the axial direction.
8. The four-point contact separation bearing unit according to any one of claims 1 to 6, characterized in that: The outer ring groove (111) and the inner ring groove (121) are axially offset.
9. The four-point contact separation bearing unit according to any one of claims 1 to 6, characterized in that: One of the outer ring (110) and the inner ring (120) is a fixed ring, and the other is a rotating ring.
10. The four-point contact separation bearing unit according to claim 9, characterized in that: A sealing member is mounted on the outer ring (110), and the sealing member and the inner ring (120) maintain a rotating seal.