Roller-slider composite bearing

Abstract

This invention relates to a rolling-sliding composite bearing, comprising a first and second ring arranged in parallel at intervals, with an annular sliding frame between the first and second rings. Multiple rolling elements are circumferentially spaced within the sliding frame. A floating support ring and a driving structure are also provided within the second ring. The driving structure can push the floating support ring axially out of the second ring. When the floating support ring is retracted into the second ring, the rolling elements can roll in contact with the first and second rings, and a gap can be formed between the sliding frame and the first and second rings. When the floating support ring is extended out of the second ring, it can push the sliding frame into contact with the first ring and push the first ring to form a gap with the rolling elements. The rolling-sliding composite bearing of this invention can achieve active switching between rolling and sliding states without relying on the elastic deformation of the material.

Description

Technical Field

[0001] This invention relates to the field of bearing design, and more particularly to a rolling-sliding composite bearing. Background Technology

[0002] Rolling bearings are suitable for stable loads and high-speed rotation conditions, while sliding bearings are characterized by high load-bearing capacity and can operate under impact loads. Tunnel boring machines (TBMs) primarily use three-row cylindrical roller bearings, operating under high load, high torque, and impact load conditions. In such conditions, a rolling / sliding composite main bearing that actively switches between rolling and sliding states is employed. Under favorable operating conditions, it operates in rolling mode to reduce driving resistance and improve rotational accuracy, while under harsh operating conditions, it can switch to sliding mode, effectively improving bearing reliability.

[0003] Existing rolling bearings achieve the conversion between rolling and sliding bearings by relying on the elastic deformation of the rolling assembly body under load. However, this elastic deformation of the rolling assembly body also makes the rolling assembly body non-circular. After the rolling assembly body is deformed into a non-circular body, its rolling will no longer be pure rolling, but will become a rolling and sliding combined motion. This will increase the wear of the rolling assembly body and the inner and outer rings of the bearing, and shorten the bearing life. Summary of the Invention

[0004] The purpose of this invention is to provide a rolling-sliding composite bearing that can actively switch between rolling and sliding states without relying on the elastic deformation of the material.

[0005] The objective of this invention is achieved as follows: a rolling-sliding composite bearing includes a first and a second ring arranged in parallel at intervals. An annular sliding frame is provided between the first and second rings. A plurality of rolling elements are circumferentially spaced within the sliding frame. A floating support ring and a driving structure are also provided within the second ring. The driving structure can push the floating support ring axially out of the second ring. When the floating support ring is retracted into the second ring, the rolling elements can roll in contact with the first and second rings, and a gap can be formed between the sliding frame and the first and second rings. When the floating support ring is extended out of the second ring, the floating support ring can push the sliding frame to contact the first ring and push the first ring to form a gap with the rolling elements.

[0006] In a preferred embodiment of the present invention, the friction coefficient between the drive structure and the floating support ring, and the friction coefficient between the floating support ring and the sliding frame are both greater than the friction coefficient between the sliding frame and the first collar.

[0007] In a preferred embodiment of the present invention, the rolling element is a cylindrical roller, and the axial direction of the rolling element is arranged radially along the sliding frame.

[0008] In a preferred embodiment of the present invention, a plurality of pockets are provided circumferentially spaced on the sliding frame, and each rolling element is embedded in the corresponding pocket.

[0009] In a preferred embodiment of the present invention, the floating support ring includes two sets of support ring groups, with a plurality of rolling elements located between the two sets of support ring groups, and each set of support ring groups includes at least one support ring body.

[0010] In a preferred embodiment of the present invention, a plurality of annular grooves are provided on one side of the second ring, and the support ring body is axially slidably installed in the corresponding annular grooves.

[0011] In a preferred embodiment of the present invention, the driving structure includes at least two sets of driving components, the number of driving components being the same as the number of support rings, each set of driving components including a plurality of driving members arranged circumferentially, and the plurality of driving members in each set of driving components being able to push the corresponding support ring to extend axially out of the second ring.

[0012] In a preferred embodiment of the present invention, a plurality of mounting holes are provided circumferentially spaced on the second collar, the mounting holes being able to connect to the corresponding annular groove and the other side annular surface of the second collar, and the driving component being able to be installed in the corresponding mounting holes.

[0013] In a preferred embodiment of the present invention, the driving component is a telescopic cylinder; or, the driving component is a pipe connector that can be connected to a compressed air supply pipe.

[0014] In a preferred embodiment of the present invention, two annular friction tracks are provided on the annular surface of the first ring facing the second ring, and an annular first raceway groove is provided on the first ring and located between the two friction tracks. A second raceway groove corresponding to the first raceway groove is provided on the annular surface of the second ring. The sliding frame can slide and rub against the friction tracks, and the rolling body can roll and rub against the first raceway groove and the second raceway groove.

[0015] Therefore, the rolling / sliding composite bearing of this invention, by setting a load-bearing sliding frame and a driving structure to switch between rolling and sliding states, can be adapted to different service conditions. When the bearing is in the rolling state, the rolling elements bear normal load, while the sliding frame and floating support ring do not bear load, only providing a restraining effect on the rolling elements. At this time, the bearing is equivalent to a normal turntable rolling bearing structure. Under harsh operating conditions, the driving force can be provided by the driving structure assembled inside the second ring, and the sliding frame is driven to contact the first ring through the floating support ring. At this time, the sliding frame is loaded and maintains frictional sliding with the second ring, realizing the sliding motion state. The entire bearing is a composite bearing structure that can actively switch between rolling and sliding states. It can switch the bearing motion state according to different operating conditions, while not relying on the elastic deformation of the material, increasing the bearing service life and enhancing the bearing reliability. Attached Figure Description

[0016] The accompanying drawings are intended only to illustrate and explain the present invention and do not limit the scope of the invention.

[0017] in:

[0018] Figure 1 : An exploded view of the rolling-sliding composite bearing provided by the present invention.

[0019] Figure 2 : A partial cross-sectional view of the rolling-sliding composite bearing provided by the present invention in a rolling state.

[0020] Figure 3 : A partial cross-sectional view of the rolling-sliding composite bearing provided by the present invention in a sliding state.

[0021] Figure 4 : A schematic diagram of the sliding frame provided by the present invention.

[0022] Explanation of icon numbers:

[0023] 1. First lap; 11. Friction track; 12. First raceway groove;

[0024] 2. Second raceway; 21. Annular groove; 22. Mounting hole; 23. Second raceway groove;

[0025] 3. Sliding frame; 31. Pocket;

[0026] 4. Rolling elements;

[0027] 5. Floating support ring; 51. Support ring body;

[0028] 6. Drive components. Detailed Implementation

[0029] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0030] like Figures 1 to 4As shown, this embodiment provides a rolling-sliding composite bearing, including a first ring 1 and a second ring 2 arranged in parallel at intervals. An annular sliding frame 3 is provided between the first ring 1 and the second ring 2. A plurality of rolling elements 4 are arranged circumferentially at intervals inside the sliding frame 3. A floating support ring 5 and a driving structure are also provided inside the second ring 2. The driving structure can push the floating support ring 5 to extend axially out of the second ring 2. When the floating support ring 5 is retracted into the second ring 2, the rolling elements 4 can roll in contact with the first ring 1 and the second ring 2, and a gap can be formed between the sliding frame 3 and the first ring 1 and the second ring 2. When the floating support ring 5 is extended out of the second ring 2, the floating support ring 5 can push the sliding frame 3 to contact the first ring 1, and can push the first ring 1 to form a gap with the rolling elements 4.

[0031] Among them, the first collar 1, the second collar 2, the sliding frame 3, and the floating support ring 5 are all coaxially arranged, and the axial direction of these components is also... Figure 2 The direction of n shown in the diagram represents the radial direction of these components. Figure 2 The direction of m is shown in the diagram. The second ring 2 is a fixed ring, which remains stationary during operation and is used to mount the drive structure; the first ring 1 is a moving ring, which can move axially to switch between rolling and sliding states. The materials of the rolling element 4 and the sliding frame 3 are both designed to directly bear axial force and have a certain degree of wear resistance; the specific materials are determined according to requirements. The floating support ring 5 is not subjected to force when the bearing is in the rolling state; when the bearing is in the sliding state, the driving force output by the drive structure drives the sliding frame 3 to move via the floating support ring 5. The drive structure is mainly used to provide the driving force required to switch between rolling and sliding states and to maintain balance with the axial force (i.e., the axial load on the bearing).

[0032] When the rolling-sliding composite bearing is in rolling state, refer to Figure 2 When the floating support ring 5 is fully retracted into the second race 2, the entire bearing is supported by the rolling element 4 during operation. The rolling element 4 rolls in contact with the two races, transferring the load from the rolling element 4 to the second race 2. At this time, there is a gap between the sliding frame 3 and the two races, which provides a holding effect for the rolling element 4, restricting the movement trajectory of the rolling element 4 without bearing load. At this time, the drive structure is not under stress. When the rolling-sliding composite bearing is in a sliding state, refer to... Figure 3 The driving structure provides driving force, which ultimately pushes the sliding frame 3 towards the first collar 1 through the floating support ring 5, and the two form a sliding friction relationship. The load is transmitted to the driving structure through the sliding frame 3 and the floating support ring 5 and is ultimately borne by the collar or the prime mover of the driving structure.

[0033] Since the entire bearing bears axial loads, when the bearing is in rolling state, the axial force on the bearing is borne by the rolling elements 4. When it needs to switch to sliding state, the drive structure provides driving force to push the sliding frame 3 and the first ring 1 to move axially. At this time, the first ring 1 and the sliding frame 3 bear the load, and the driving force provided by the drive structure is balanced with the axial force on the bearing. When it needs to switch back to rolling state, the drive structure no longer provides driving force, and under the action of the axial force on the bearing, the first ring 1 is pushed axially back to its original position. Figure 2 The scrolling state is shown in the image.

[0034] Therefore, the rolling / sliding composite bearing in this embodiment, by setting a load-bearing sliding frame 3 and a driving structure to switch between rolling and sliding states, can be adapted to different service conditions. When the bearing is in the rolling state, the rolling element 4 is normally loaded, while the sliding frame 3 and floating support ring 5 are not loaded, only providing a restraining effect on the rolling element 4. At this time, the bearing is equivalent to a normal turntable rolling bearing structure. Under harsh working conditions, the driving force can be provided by the driving structure assembled inside the second ring 2, and the sliding frame 3 is driven to contact the first ring 1 through the floating support ring 5. At this time, the sliding frame 3 is loaded and maintains frictional sliding with the second ring 2, realizing the sliding motion state. The entire bearing is a composite bearing structure that can actively switch between rolling and sliding states. It can switch the bearing motion state according to different working conditions, while not relying on the elastic deformation of the material, increasing the bearing service life and enhancing the bearing reliability.

[0035] In the specific implementation, the friction coefficient between the drive structure and the floating support ring 5, and the friction coefficient between the floating support ring 5 and the sliding frame 3 are both greater than the friction coefficient between the sliding frame 3 and the first collar 1; so as to ensure that the sliding motion only occurs or mostly occurs between the sliding frame 3 and the first collar 1.

[0036] In this embodiment, the rolling element 4 is a cylindrical roller, and the axial direction of the rolling element 4 is arranged radially along the sliding frame 3. A plurality of pockets 31 are spaced apart circumferentially on the sliding frame 3, and each rolling element 4 is embedded in the corresponding pocket 31.

[0037] Structural reference of sliding frame 3 Figure 4 The sliding frame 3 should have a pocket 31 that restricts the movement path of the rolling element 4 in the rolling state, and a friction track structure that can form a sliding friction relationship in the sliding state. The pocket 31 can be a rectangular hole or other shapes, as long as it can hold the rolling element 4. Of course, the rolling element 4 can also be a sphere if needed, and the pocket 31 can be a corresponding spherical hole.

[0038] Furthermore, the floating support ring 5 includes two sets of support ring groups, with multiple rolling elements 4 located between the two sets of support ring groups. Each set of support ring groups includes at least one support ring body 51. The two sets of support ring groups can respectively correspond to the outer and inner rings of the sliding frame 3 of the rolling element 4, so that the sliding frame 3 is subjected to more even force. The number of support ring bodies 51 in each set of support ring groups is determined as needed; for example, in this embodiment, each set of support ring groups includes one support ring body 51.

[0039] Reference Figure 1 Multiple annular grooves 21 are provided on one side of the second ring 2 (i.e., the annular surface facing the first ring 1), and the supporting ring 51 is axially slidably installed in the corresponding annular grooves 21.

[0040] The drive structure includes at least two sets of drive components, the number of which is the same as the number of support rings 51. Each set of drive components includes multiple drive elements 6 arranged circumferentially. The multiple drive elements 6 in each set of drive components can push the corresponding support ring 51 to extend axially out of the second collar 2. The multiple drive elements 6 can provide a stable driving force. The floating support ring 5 can convert the point driving force output by each drive element 6 into a uniformly distributed force, uniformly driving the sliding frame 3 to move, so as to ensure the frictional relationship between the sliding frame 3 and the first collar 1.

[0041] To facilitate installation, multiple mounting holes 22 are provided circumferentially spaced on the second collar 2. The mounting holes 22 can connect to the corresponding annular groove 21 and the other side annular surface of the second collar 2 (i.e., the annular surface facing away from the first collar 1). The drive component 6 can be installed in the corresponding mounting holes 22.

[0042] The drive component 6 can be a telescopic cylinder, such as a hydraulic cylinder; or, the drive component 6 can be a pipe joint that can be connected to a compressed air supply pipe to use compressed air to drive the sliding frame 3 to move. Of course, the drive component 6 can also be a motor or any other structure that can provide driving force; this embodiment is only for illustrative purposes.

[0043] Furthermore, two annular friction tracks 11 are provided on the annular surface of the first ring 1 facing the second ring 2. An annular first raceway groove 12 is provided on the first ring 1 and located between the two friction tracks 11. A second raceway groove 23 corresponding to the first raceway groove 12 is provided on the annular surface of the second ring 2. The sliding frame 3 can slide and rub against the friction tracks 11, and the rolling body 4 can roll and rub against the first raceway groove 12 and the second raceway groove 23.

[0044] The friction raceway 11 can be formed by surface treatment of the bearing ring, or it can be an additional, separate wear-resistant raceway. When the bearing is in a rolling state, the rolling element 4 contacts the first raceway groove 12 on the first bearing ring 1 and the second raceway groove 23 on the second bearing ring 2. When the bearing is in a sliding state, the sliding frame 3 contacts the two friction raceways 11 on the first bearing ring 1, forming a sliding friction relationship.

[0045] In summary, the rolling-sliding composite bearing in this embodiment can actively switch between rolling and sliding states, and the switching process relies on the driving force provided by the drive unit, rather than elastic deformation, thus enhancing bearing reliability. Operators can flexibly switch between the rolling mode of the rolling element 4 and the sliding mode of the sliding frame 3 according to the actual service conditions of the bearing, improving bearing service conditions and enhancing bearing reliability under harsh conditions. It is particularly suitable for large rolling-sliding composite bearings.

[0046] The above are merely illustrative embodiments of the present invention and are not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A rolling-sliding composite bearing, characterized in that, It includes a first collar (1) and a second collar (2) arranged in parallel intervals. An annular sliding frame (3) is provided between the first collar (1) and the second collar (2). Multiple rolling elements (4) are arranged circumferentially in the sliding frame (3). A floating support ring (5) and a driving structure are also provided in the second collar (2). The driving structure can push the floating support ring (5) to extend axially out of the second collar (2). When the floating support ring (5) is retracted into the second collar (2), the rolling element (4) can roll in contact with the first collar (1) and the second collar (2), and the sliding frame (3) can form a gap with the first collar (1) and the second collar (2); when the floating support ring (5) extends out of the second collar (2), the floating support ring (5) can push the sliding frame (3) to contact the first collar (1), and can push the first collar (1) to form a gap with the rolling element (4).

2. The rolling-sliding composite bearing as described in claim 1, characterized in that, The coefficient of friction between the driving structure and the floating support ring (5) and the coefficient of friction between the floating support ring (5) and the sliding frame (3) are both greater than the coefficient of friction between the sliding frame (3) and the first collar (1).

3. The rolling-sliding composite bearing as described in claim 1, characterized in that, The rolling element (4) is a cylindrical roller, and the axial direction of the rolling element (4) is arranged along the radial direction of the sliding frame (3).

4. The rolling-sliding composite bearing as described in claim 1, characterized in that, A plurality of pockets (31) are spaced apart circumferentially on the sliding frame (3), and each of the rolling elements (4) is embedded in the corresponding pocket (31).

5. The rolling-sliding composite bearing as described in claim 1, characterized in that, The floating support ring (5) includes two sets of support ring groups, and a plurality of rolling elements (4) are located between the two sets of support ring groups. Each set of support ring groups includes at least one support ring body (51).

6. The rolling-sliding composite bearing as described in claim 5, characterized in that, Multiple annular grooves (21) are provided on one side of the second ring (2), and the support ring (51) can be axially slidably installed in the corresponding annular grooves (21).

7. The rolling-sliding composite bearing as described in claim 6, characterized in that, The driving structure includes at least two sets of driving components. The number of sets of driving components is the same as the number of support rings (51). Each set of driving components includes multiple driving elements (6) arranged circumferentially. The multiple driving elements (6) in each set of driving components can push the corresponding support ring (51) to extend axially out of the second collar (2).

8. The rolling-sliding composite bearing as described in claim 7, characterized in that, The second collar (2) is provided with a plurality of mounting holes (22) spaced apart in the circumferential direction. The mounting holes (22) can connect the corresponding annular groove (21) and the other side annular surface of the second collar (2). The driving member (6) can be installed in the corresponding mounting hole (22).

9. The rolling-sliding composite bearing as described in claim 7, characterized in that, The driving component (6) is a telescopic cylinder; or, the driving component (6) is a pipe joint that can be connected to a compressed air supply pipe.

10. The rolling-sliding composite bearing as described in claim 1, characterized in that, Two annular friction tracks (11) are provided on the annular surface of the first collar (1) facing the second collar (2). An annular first raceway groove (12) is provided on the first collar (1) and located between the two friction tracks (11). A second raceway groove (23) corresponding to the first raceway groove (12) is provided on the annular surface of the second collar (2). The sliding frame (3) can slide and rub against the friction tracks (11), and the rolling body (4) can roll and rub against the first raceway groove (12) and the second raceway groove (23).

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