Clean crane leak-proof wheel set
By using nickel-plated stainless steel and a double-sealing structure, the problems of poor corrosion resistance and oil leakage in traditional crane wheel sets are solved, achieving effective sealing and pollution prevention in high-cleanliness environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- AOLITONG CRANE (JIANGSU) CO LTD
- Filing Date
- 2025-09-18
- Publication Date
- 2026-08-04
AI Technical Summary
Traditional crane wheel sets are made of materials with poor corrosion resistance, which easily corrodes and produces debris. They are also prone to oil leakage and dripping, polluting the dust-free environment and failing to meet the requirements for high cleanliness.
The wheel assembly is made of nickel-plated stainless steel and uses sealing components such as O-rings, end caps and through caps to achieve double sealing of the bearing, which enhances corrosion resistance and prevents lubricating oil leakage.
It improves the corrosion resistance of the wheel assembly, prevents lubricant leakage, ensures use under high-cleanliness conditions, and reduces processing difficulty and pollution risk.
Smart Images
Figure CN224590573U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of crane technology, and in particular to a clean crane oil-leakage-proof wheel assembly. Background Technology
[0002] A bridge crane is a type of bridge crane that runs on elevated rails. It includes two sets of end beams and two sets of main beams set between the end beams. The two ends of the end beams are equipped with wheel sets, which can drive the end beams to move back and forth on the guide rails below them.
[0003] Currently, the demand for cleanroom environments in high-precision manufacturing is increasing. However, traditional crane wheel sets are made of materials with poor corrosion resistance, which easily produce debris and fall off after corrosion. In addition, the wheel sets are filled with lubricating oil to lubricate the bearings installed inside the wheel sets, but traditional wheel sets are prone to oil leakage and dripping. All of these situations will pollute the cleanroom environment, and traditional crane wheel sets can no longer meet the high cleanliness requirements of operating conditions. Utility Model Content
[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a clean crane oil-leakage-proof wheel assembly with nickel plating to enhance corrosion resistance, increase sealing structure, and prevent oil leakage and dripping.
[0005] This utility model provides a cleanroom crane oil-leakage-proof wheel assembly, comprising: wheel; A support assembly includes a rotating shaft, a bushing, a bearing, and a bearing housing. The wheel is fitted onto the middle of the rotating shaft and is keyed to the rotating shaft. Bearings are symmetrically arranged at both ends of the rotating shaft about the wheel. A bushing is positioned between the bearing and the wheel, and the bushing is fixedly fitted onto the outside of the rotating shaft. A bearing housing is fixedly fitted onto the outside of the bearing to support and mount it. The bearing housing is used to fixally connect to the end beam of the crane to provide support for the wheel. (How are the rotating shaft and bushing connected?) The oil injection assembly includes a pressure oil injection cup, which is fixedly disposed on the outer wall of the bearing housing and communicates with the bearing, for injecting lubricating oil into the bearing; The sealing assembly includes a first seal and a second seal. The first seal is disposed between the bearing housing and the bushing to seal the space between the bearing housing and the bushing. The second seal is disposed at both ends of the rotating shaft to seal the space between the bearing housing and the bearing.
[0006] Furthermore, the wheel has a through hole at its center for the rotating shaft to pass through, and a flat key is fixedly installed on the inner wall of the through hole. The outer wall of the rotating shaft has a keyway that matches the flat key. (How many flat keys are there?) Furthermore, the rotating shaft is hollow inside, and the first end of the rotating shaft is a sealed structure and the second end is an open structure. An internal spline is fixedly provided on the inner wall of the second end of the rotating shaft for connection with the drive source that drives its rotation.
[0007] Furthermore, the first sealing element includes an O-ring, and an annular groove is provided on the outer wall of both sets of bushings along its circumference. The O-ring is fixedly installed in the annular groove, and the outer periphery of the O-ring abuts against the inner wall of the corresponding bearing seat. A first oil chamber for lubricating oil flow is provided between the side of the bearing closest to the wheel and the inner wall of the corresponding bearing housing.
[0008] Furthermore, the second sealing element includes a cap, a through cap, and a lip seal. The cap is provided on the side of the bearing at the first end of the rotating shaft away from the wheel. The cap is threadedly connected to the bearing seat at the first end of the rotating shaft, and the end face of the cap near the bearing abuts against the outer ring of the corresponding bearing. The through cap is provided on the side of the bearing at the second end of the rotating shaft away from the wheel. The through cap is threadedly connected to the bearing seat at the second end of the rotating shaft, and the end face of the through cap near the bearing abuts against the outer ring of the corresponding bearing. The lip seal is sleeved on the second end of the rotating shaft, and the outer circumference of the lip seal abuts against the inner wall of the through cap, and the inner circumference abuts against the outer wall of the rotating shaft. A second oil chamber for lubricating oil flow is provided between the cover and the corresponding bearing at an interval, and a third oil chamber for lubricating oil flow is provided between the cover and the corresponding bearing at an interval.
[0009] Furthermore, both sets of bearing housings have multiple threaded through holes radially formed on their outer walls, and set screws are threaded into the threaded through holes for contacting the outer wall of the end cap or through cap.
[0010] Furthermore, the bearing housing is fastened to the end beam of the crane by bolts.
[0011] Furthermore, the wheel, the set screw, and the bolt are all made of stainless steel, and the rotating shaft, the bushing, the bearing, the bearing seat, the end cap, and the through cap are all nickel-plated.
[0012] Furthermore, the outer rim of the wheel is chamfered.
[0013] Compared with the prior art, the beneficial effects of this utility model are: (1) This utility model provides a mounting base and support for the wheel through the support component. Lubricating oil can be injected into the bearing inside the wheel assembly after production through the oil injection cup. A first seal is set between the bearing seat and the bushing, and a second seal is set at both ends of the rotating shaft. This can seal the bearing seat and bushing, and the bearing seat and bearing, to prevent the lubricating oil inside the bearing from leaking out from the joint between the bearing seat and bushing, and the joint between the bearing seat and bearing, making it easy to use in working conditions with high cleanliness requirements. (2) The wheels, set screws and bolts used in this utility model are all made of stainless steel. The rotating shaft, bearings, bearing seats, end caps and through caps are all nickel-plated, which enhances the overall corrosion resistance of the wheel assembly and avoids indirect pollution such as particulate pollution generated during the corrosion process. (3) The second sealing component in this utility model includes a cap, a through cap, and a lip seal. The cap and the through cap are threaded to the inner wall of the corresponding bearing seat and abut against the outer ring of the corresponding bearing. The sealing is achieved through the threaded connection and the end face abutment. The through cap, together with the lip seal, seals the connection position between the through cap and the rotating shaft, preventing oil leakage on the side of the bearing away from the wheel on the wheel assembly. The cap and the through cap are sealed by threaded connection. While achieving the seal, the bearing can also be axially positioned. The sealing performance of the threaded connection itself is not highly sensitive to processing errors, which reduces the processing difficulty.
[0014] It should be understood that the description in this utility model description section is not intended to limit the key or essential features of the embodiments of this utility model, nor is it intended to restrict the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description
[0015] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a side view of the present invention. Figure 2 for Figure 1 Sectional view of AA; Figure 3 A schematic diagram of the internal structure of the wheel from another angle; Figure 4 for Figure 2 Enlarged view of point A in the middle; The diagram labels are: 1. Wheel; 2. Support assembly; 3. Oil injection assembly; 4. Sealing assembly. 11. Flat key; 21. Rotating shaft; 22. Bushing; 23. Bearing; 24. Bearing housing; 31. Oil injection cup; 41. First seal; 42. Second seal; 241. Set screw; 242. Bolt; 411. O-ring seal; 421. End cap; 422. Through cap; 423. Lip seal. Detailed Implementation
[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.
[0017] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.
[0018] Please refer to Figures 1-4 An embodiment of this utility model provides a clean crane oil-leakage-proof wheel assembly, comprising: Wheel 1; Support assembly 2 includes a rotating shaft 21, a bushing 22, a bearing 23, and a bearing seat 24. A wheel 1 is fitted in the middle of the rotating shaft 21 and the wheel 1 is keyed to the rotating shaft 21. Bearings 23 are symmetrically arranged at both ends of the rotating shaft 21 about the wheel 1. A bushing 23 is provided between the bearing 23 and the wheel 1. The bushing 23 is fixedly fitted on the outside of the rotating shaft 21. A bearing seat 24 for supporting and installing the bearing 23 is fixedly fitted on the outside of the bearing 23. The bearing seat 24 is used to be fixedly connected to the end beam of the crane to provide support for the wheel 1. The oil injection assembly 3 includes an oil injection cup 31, which is fixedly installed on the outer wall of the bearing housing 24 and communicates with the bearing 22 for injecting lubricating oil into the bearing 22. The sealing assembly 4 includes a first seal 41 and a second seal 42. The first seal 41 is disposed between the bearing housing 24 and the bushing 23 to seal the bearing housing 24 and the bushing 23. The second seal 42 is disposed at both ends of the rotating shaft to seal the bearing housing 24 and the bearing 23.
[0019] In this embodiment, the bushing 22 is fixedly connected to the rotating shaft 21 by an interference fit, and an annular flange is fixedly provided at one end of the bushing 22 near the wheel 1. The annular flange fits against both sides of the wheel 1 and is used to axially position the wheel 1. Two sets of bearing housings 24 are fixedly connected to the end beam of the crane, providing support and installation foundation for the bearing 23. The bearing 23 is a self-aligning roller bearing available on the market. The self-aligning roller bearing is installed in the bearing housing 24, and the inner ring of the bearing 23 is fixedly sleeved on the rotating shaft 21. The outer ring of the bearing 23 is fixedly connected to the bearing housing 24. Specifically, the model of the bearing 23 is selected, but not limited to, 22216CA / W33. The oil injection cup 31 is a straight-through type. An oil inlet is radially provided on the outer wall of the bearing housing 24. The oil injection cup 31 is fixedly installed inside the oil inlet. Three oil holes are provided on the outer ring of the self-aligning roller bearing. One of the oil holes is used to communicate with the oil outlet of the oil injection cup 31. After the wheel assembly is completed, lubricating oil is added to the bearing 23 through the oil injection cup 31. The lubricating oil enters the roller between the outer ring and the inner ring through the oil hole to play a lubricating role. The existing technology is used to inject the lubricating oil here, which will not be described in detail. Specifically, the bearing 23 is installed in the corresponding bearing housing 24. Oil leakage is prone to occur at the connection position between the outer side of the bearing 23 (i.e. the side of the bearing 23 away from the wheel 1) and the bearing housing 24, and at the connection position between the inner side of the bearing 23 (i.e. the side of the bearing 23 close to the wheel 1) and the bushing 22. In this application, a first seal 41 is provided between the bearing housing 24 and the bushing 22, and a second seal 42 is provided at both ends of the rotating shaft 21. This can seal the connection between the bearing housing 24 and the bushing 22, and between the bearing housing 24 and the bearing 23, to prevent the lubricating oil inside the bearing 23 from leaking out from the joint between the bearing housing 24 and the bushing 22, and the joint between the bearing housing 24 and the bearing 23, making it easy to use in working conditions with high cleanliness requirements. In use, the two sets of bearing seats 24 are fixedly connected to one end of the end beam to provide a mounting base and support. One end of the rotating shaft 21 is connected to an external drive source. The drive source drives the rotating shaft 21 to rotate, which in turn drives the wheel 1 connected to it to rotate, so that the wheel 1 moves along the track at its bottom.
[0020] In a preferred embodiment, such as Figure 3 As shown, a through hole is provided in the center of the wheel 1 for the rotating shaft 21 to pass through, and a flat key 11 is fixedly provided on the inner wall of the through hole. A keyway matching the flat key 11 is provided on the outer wall of the rotating shaft 21.
[0021] In this embodiment, a flat key is fixedly installed on the inner wall of the center of the wheel 1. The rotating shaft 21 and the wheel 1 are connected by the key to transmit torque. The flat key 11 is an ordinary flat key. The two sides of the flat key 11 are tightly fitted with the two sides of the keyway, which can ensure the concentricity of the wheel 1 and the rotating shaft 21, with good centering and more convenient assembly and disassembly.
[0022] In a preferred embodiment, such as Figure 2As shown, the rotating shaft 21 is hollow inside, and the first end of the rotating shaft 21 is a sealed structure and the second end is an open structure. An internal spline is fixedly provided on the inner wall of the second end of the rotating shaft 21 for connecting with the drive source that drives its rotation.
[0023] In this embodiment, the rotating shaft 21 is a hollow shaft, and the second end of the hollow shaft is an open structure. An internal spline is fixedly provided on the inner wall of the second end. The internal spline is an involute spline. An external spline matching the internal spline is provided on the outer wall of the drive shaft of the drive component. The drive shaft is inserted into the rotating shaft 21. The two are connected by a key to transmit mechanical torque and drive the rotating shaft 21 to rotate synchronously.
[0024] In a preferred embodiment, such as Figure 2 and Figure 4 As shown, the first sealing element 41 includes an O-ring seal 411. Both sets of bushings 22 have annular grooves along their circumference on their outer walls. An O-ring seal 411 is fixedly installed in the annular grooves. The outer periphery of the O-ring seal 411 abuts against the inner wall of the corresponding bearing seat 24. A first oil chamber for lubricating oil flow is provided between the side of bearing 23 near wheel 1 and the inner wall of the corresponding bearing housing 24.
[0025] In this embodiment, a first oil cavity is formed between the side of the bearing 23 near the wheel 1 and the inner wall of the corresponding bearing seat 24 at a certain distance. The first oil cavity is an annular cavity. When lubricating oil is injected, lubricating oil is left in the first oil cavity for the lubricating oil to penetrate into the bearing 23. An O-ring 411 is provided between the bearing housing 24 and the bushing 22. The O-ring 411 seals the connection between the bearing housing 24 and the bushing 22 (i.e., the inner side of the bearing 23) to prevent lubricating oil from leaking out from the joint between the bearing housing 24 and the bushing 22, thereby improving its cleanliness requirements. Specifically, O-rings can be made of materials such as nitrile rubber, fluororubber, acrylate rubber, and fluorosilicone rubber.
[0026] In a preferred embodiment, such as Figure 2 and Figure 4As shown, the second sealing element 41 includes a cap 421, a through cap 422, and a lip seal 423. The cap 421 is provided on the side of the bearing 23 located at the first end of the rotating shaft 21 away from the wheel 1. The cap 421 is threadedly connected to the bearing seat 24 located at the first end of the rotating shaft 21, and the end face of the cap 421 near the bearing 23 abuts against the outer ring of the corresponding bearing 23. The through cap 422 is provided on the side of the bearing 23 located at the second end of the rotating shaft 21 away from the wheel 1. The through cap 422 is threadedly connected to the bearing seat 24 located at the second end of the rotating shaft 21, and the end face of the through cap 422 near the bearing 23 abuts against the outer ring of the corresponding bearing 23. The lip seal 423 is sleeved on the second end of the rotating shaft 21, and the outer periphery of the lip seal 423 abuts against the inner wall of the through cap 422, and the inner periphery abuts against the outer wall of the rotating shaft 21. A second oil chamber for lubricating oil flow is provided between the cover 421 and the corresponding bearing 23 at an interval, and a third oil chamber for lubricating oil flow is provided between the cover 422 and the corresponding bearing 23 at an interval.
[0027] In this embodiment, a second oil cavity is formed between the cover 421 and the bearing 23 located at the left end at a certain distance. The second oil cavity is a disc-shaped inner cavity. A third oil cavity is formed between the cover 422 and the bearing 23 located at the right end at a certain distance. The third oil cavity is an annular cavity. The second oil cavity and the third oil cavity have the same function as the first oil cavity, which is to store oil. Both the end cap 421 and the through cap 422 have external threads on their outer surfaces, and the bearing housing 24 has internal threads on its inner wall. The end cap 421 is threadedly connected to the bearing housing 24 located at the first end of the rotating shaft (the bearing housing 24 located at the left end), and its end face near the bearing 23 abuts against the outer ring of the bearing 23. The seal is achieved through the threaded connection and the end face abutment. Similarly, the through cap 422 is threadedly connected to the bearing housing 24 located at the second end of the rotating shaft (the bearing housing 24 located at the right end), and its end face near the bearing 23 abuts against the outer ring of the bearing 23. The opening of the lip seal 423 faces the bearing 23. The threaded connection and the lip seal 423 achieve a seal, preventing oil leakage at the connection point between the bearing housing 24 and the bearing 23 (i.e., the outer side of the bearing 23). The end cap 421 and the through cap 422 achieve a seal through threaded connection. While achieving a seal, the bearing 23 can also be axially positioned. Moreover, the sealing performance of the threaded connection itself is not highly sensitive to machining errors, reducing the machining difficulty.
[0028] In a preferred embodiment, such as Figure 2 and Figure 4 As shown, multiple threaded through holes are radially provided on the outer walls of both sets of bearing housings 24. Set screws 241 are threadedly connected to the inner threads of the threaded through holes. The set screws 241 are used to abut against the outer walls of the end cap 421 or the through cap 422.
[0029] In this embodiment, the set screw 241 is a hexagonal tapered set screw, and the tapered end abuts against the outer wall of the end cap 421 or through cap 422 to further fix the threaded end cap 421 or through cap 422 and prevent the end cap 421 or through cap 422 from loosening.
[0030] In a preferred embodiment, such as Figure 1 As shown, the bearing housing 24 is fastened to the end beam of the crane by bolts 242.
[0031] In this embodiment, a plurality of bolts 242 are provided along the circumference of the end of the bearing housing 24 away from the wheel 1. The bolts 242 are selected as internal hexagonal head screws, and the bearing housing 24 is fixedly connected to the end beam by internal hexagonal head screws.
[0032] In a preferred embodiment, such as Figure 2 As shown, wheel 1, set screw 241 and bolt 242 are all made of stainless steel, and rotating shaft 21, bushing 22, bearing 23, bearing seat 24, end cap 421 and through cap 422 are all nickel plated.
[0033] In this embodiment, by selecting stainless steel wheels 1 and nickel plating the parts, the overall corrosion resistance of the wheel assembly is enhanced, avoiding indirect pollution such as particulate contamination generated during the corrosion process.
[0034] In a preferred embodiment, such as Figure 2 As shown, the outer rim of wheel 1 is chamfered. Specifically, the chamfer reduces friction between wheel 1 and the track, thereby reducing the generation of metal debris.
[0035] In the description of this specification, the terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0036] In the description of this specification, the terms "one embodiment," "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0037] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A clean crane oil-leakage-proof wheel set, characterized in that, include: wheel; A support assembly includes a rotating shaft, a bushing, a bearing, and a bearing housing. The wheel is fitted onto the middle of the rotating shaft and is keyed to the rotating shaft. The bearings are symmetrically arranged at both ends of the rotating shaft about the wheel. The bushing is provided between the bearing and the wheel. The bushing is fixedly fitted onto the outside of the rotating shaft. The bearing housing is fixedly fitted onto the outside of the bearing for supporting and mounting the bearing. The bearing housing is used to be fixedly connected to the end beam of the crane to provide support for the wheel. The oil injection assembly includes a pressure oil injection cup, which is fixedly disposed on the outer wall of the bearing housing and communicates with the bearing, for injecting lubricating oil into the bearing; The sealing assembly includes a first seal and a second seal. The first seal is disposed between the bearing housing and the bushing to seal the space between the bearing housing and the bushing. The second seal is disposed at both ends of the rotating shaft to seal the space between the bearing housing and the bearing.
2. The clean crane oil-leakage-proof wheel assembly according to claim 1, characterized in that, The wheel has a through hole in the center for the rotating shaft to pass through, and a flat key is fixedly installed on the inner wall of the through hole. The rotating shaft has a keyway on the outer wall that matches the flat key.
3. The clean crane oil-leakage-proof wheel assembly according to claim 2, characterized in that, The rotating shaft is hollow inside, and the first end of the rotating shaft is a sealed structure and the second end is an open structure. An internal spline is fixedly provided on the inner wall of the second end of the rotating shaft for connection with the drive source that drives its rotation.
4. The clean crane oil-leakage-proof wheel assembly according to claim 1, characterized in that, The first sealing element includes an O-ring. An annular groove is provided on the outer wall of both sets of bushings along its circumference. The O-ring is fixedly installed in the annular groove. The outer periphery of the O-ring abuts against the inner wall of the corresponding bearing seat. A first oil chamber for lubricating oil flow is provided between the side of the bearing closest to the wheel and the inner wall of the corresponding bearing housing.
5. A cleanroom crane oil-leakage-proof wheel assembly according to claim 3, characterized in that, The second sealing element includes a cap, a through cap, and a lip seal. The cap is provided on the side of the bearing located at the first end of the rotating shaft away from the wheel. The cap is threadedly connected to the bearing seat at the first end of the rotating shaft, and the end face of the cap near the bearing abuts against the outer ring of the corresponding bearing. The through cap is provided on the side of the bearing located at the second end of the rotating shaft away from the wheel. The through cap is threadedly connected to the bearing seat at the second end of the rotating shaft, and the end face of the through cap near the bearing abuts against the outer ring of the corresponding bearing. The lip seal is sleeved on the second end of the rotating shaft, and the outer circumference of the lip seal abuts against the inner wall of the through cap, and the inner circumference abuts against the outer wall of the rotating shaft. A second oil chamber for lubricating oil flow is provided between the cover and the corresponding bearing at an interval, and a third oil chamber for lubricating oil flow is provided between the cover and the corresponding bearing at an interval.
6. The clean crane oil-leakage-proof wheel set according to claim 5, characterized in that, Both sets of bearing housings have multiple threaded through holes radially formed on their outer walls. Set screws are threaded into the threaded through holes and are used to abut against the outer wall of the end cap or through cap.
7. A cleanroom crane oil-leakage-proof wheel assembly according to claim 6, characterized in that, The bearing housing is fastened to the end beam of the crane by bolts.
8. A cleanroom crane oil-leakage-proof wheel assembly according to claim 7, characterized in that, The wheels, set screws, and bolts are all made of stainless steel, and the rotating shaft, bushing, bearing, bearing seat, end cap, and through cap are all nickel-plated.
9. A cleanroom crane oil-leakage-proof wheel assembly according to claim 1, characterized in that, The outer rim of the wheel is chamfered.