A cross shaft assembly and a cross universal joint

Abstract

The utility model discloses a kind of cross shaft assembly and cross universal coupling, belong to coupling technical field.The cross shaft assembly, including cross shaft body, thrust bearing and the bearing outer ring for installing the thrust bearing;Cross shaft body has four axle heads, end cap is set to four axle heads;Sealing assembly, it includes the lip seal ring between the axle head and end cap and the O-shaped sealing ring between the bearing outer ring and end cap;Connecting component, it includes screw rod and nut, screw rod both ends are equipped with the thread of cooperation nut, middle part is light pole structure, the center of cross shaft body is provided with two center holes, two center hole components are beneficial to the stress distribution of optimization cross shaft body, improve its overall component strength;The threaded portion of the screw rod both ends protrudes center hole, middle light pole portion cooperates with center hole inner wall;End cap is connected and fixed with bearing outer ring by screw rod and nut.

Description

Technical Field

[0001] This utility model belongs to the field of coupling technology, and more specifically, relates to a cross shaft assembly and a cross universal coupling. Background Technology

[0002] Universal joints are used to connect two shafts with intersecting or parallel axes to transmit rotation and torque. They are one of the key components of mechanical transmission and are widely used in machinery and equipment in metallurgy, hoisting, papermaking and other industries.

[0003] Figure 1 The sealing structure of the common cross shaft assembly in China allows external water and corrosive liquids to flow into the cross shaft assembly through the threaded hole gap on the bearing end cover during use. This causes the grease that lubricates the bearings in the cross shaft assembly to be missing, which in turn leads to the failure of the bearings in the cross shaft assembly due to corrosion and wear. At the same time, the adjusting shim is made of copper alloy, which is prone to wear during operation, resulting in excessive axial clearance. In addition, the interference fit between the bearing outer ring and the flange fork can cause the outer ring to run away, which directly affects the service life of the cross universal coupling and may even lead to production stoppage. Summary of the Invention

[0004] 1. The problem to be solved To address the problem that existing structures cannot achieve dynamic bidirectional sealing, this utility model provides a cross shaft assembly and a cross universal coupling. The cross shaft assembly can achieve effective sealing and waterproofing performance, allowing the bearings to be fully lubricated.

[0005] 2. Technical Solution To solve the above problems, the present invention adopts the following technical solution.

[0006] The first aspect of this utility model is to provide a cross shaft assembly, including a cross shaft body, a thrust bearing, and a bearing outer ring for mounting the thrust bearing; the cross shaft body has four shaft ends, each shaft end is fitted with a roller bearing, the bearing outer ring is fitted on the roller bearing and sealed, and end caps are provided on the four shaft ends. A sealing assembly, comprising a lip seal disposed between the shaft head and the end cover and an O-ring seal disposed between the bearing outer ring and the end cover; The connecting assembly includes a screw and a nut. The screw has threads at both ends to mate with the nut, and a smooth rod structure in the middle. The cross shaft body has two central holes arranged symmetrically at 90°. The design of the two central holes helps to optimize the force distribution of the cross shaft body and improve its overall strength. The threaded portions at both ends of the screw extend out of the central holes, and the smooth rod portion in the middle mates with the inner wall of the central holes, ensuring that the screw can rotate flexibly or move axially within the central holes. The end cap is connected and fixed to the outer ring of the bearing by screws and nuts.

[0007] According to any embodiment of the first aspect of this utility model, a bolt through hole is provided in the end cap, the bolt through hole is located on one side of the center line of the end cap and is offset from the center of the end cap; a threaded hole is provided in the end cap, the threaded hole is located on one side of the center line of the end cap and is offset from the center of the end cap, and is consistent with the center line of the bolt through hole. This non-centrally symmetrical hole design facilitates the connection between the end cap and other components, and at the same time avoids the problem of weakening the component strength caused by the central hole design.

[0008] According to any embodiment of the first aspect of this utility model, a hexagonal head type screw plug is fitted inside the threaded hole. The screw plug can surround the screw and nut inside. The screw plug can not only protect the screw and nut from damage caused by external collisions, corrosion, etc., but also further improve the sealing performance of the cross shaft assembly.

[0009] According to any embodiment of the first aspect of the present invention, an inner stop is provided on the shaft head, and a lip seal is installed on the inner stop. The lip seal has excellent sealing performance and can effectively prevent external impurities from entering the mating gap between the shaft head and other components, while preventing internal grease leakage. An annular groove is formed on the inner end face of the end cover. The annular groove can be used to install an O-ring seal, thereby improving the sealing performance of the contact surface between the end cover and the outer ring of the bearing.

[0010] According to any embodiment of the first aspect of this utility model, a stepped hole is formed inside the outer ring of the bearing for installing a thrust bearing. The thrust bearing is installed into the stepped hole machined inside the outer ring of the bearing to ensure that the installation position of the thrust bearing is accurate and fits tightly against the inner wall of the stepped hole without any skewing or looseness, so as to ensure that the thrust bearing can effectively bear the axial load. Compared with the traditional copper alloy adjusting shim, the thrust bearing has a stronger load-bearing capacity and can effectively reduce the problem of excessive axial clearance caused by component wear, thereby improving the overall operating stability and service life of the cross shaft assembly.

[0011] According to any embodiment of the first aspect of the present invention, the end cover is provided with an oil hole, and an oil injection nozzle for injecting oil into the thrust bearing is provided on the oil hole. The oil injection nozzle is used to periodically replenish the bearing with grease to ensure that the bearing is always in a good lubrication state.

[0012] The second aspect of this utility model is to provide a universal joint, including a flange fork and a universal joint assembly, wherein the universal joint assembly is the same as the universal joint assembly described in the first aspect.

[0013] According to any embodiment of the second aspect of this utility model, a keyway is provided below the bearing hole of the flange fork, and two threaded holes are provided in the keyway. The keyway provides an installation base for subsequent connection with other components via a flat key. At the same time, the two threaded holes in the keyway can be used to install fasteners such as bolts, further enhancing the connection stability between the flange fork and the cross shaft assembly and avoiding the occurrence of outer ring slippage due to interference fit issues.

[0014] According to any embodiment of the second aspect of this utility model, a keyway is provided on the end cover, the keyway is located on one side of the center line, the keyway cooperates with the keyway on the flange fork, and a flat key is provided, the flat key realizes the precise positioning and torque transmission between the end cover and the flange fork, and further enhances the stability of the universal joint.

[0015] 3. Beneficial effects Compared with the prior art, the beneficial effects of this utility model are as follows: (1) By setting an O-ring seal on the contact surface between the end cover and the outer ring of the bearing and installing a lip seal on the inner stop of the cross shaft head, this utility model effectively prevents external water, corrosive liquids and other impurities from entering the cross shaft assembly, while preventing internal grease leakage, and ensuring good sealing and waterproof performance of the cross shaft assembly. (2) The oil injection nozzle and oil hole on the end cap of this utility model provide a convenient channel for replenishing bearing grease, which can ensure that the bearing is always fully lubricated, avoid bearing corrosion and wear due to insufficient lubrication and extend the service life of the bearing. (3) This utility model replaces the traditional copper alloy adjusting shim with a thrust bearing installed in the stepped hole of the outer ring of the bearing. The thrust bearing has a stronger load-bearing capacity and can effectively bear the axial load, reducing the problem of excessive axial clearance caused by the wear of the adjusting shim, and improving the running stability and overall load-bearing capacity of the cross shaft assembly. (4) The keyway machined below the bearing hole of the flange fork of this utility model is matched with the keyway in the end cover. It is connected by a flat key and fixed by the threaded hole bolt at the keyway. This connection method effectively avoids the phenomenon of outer ring running due to interference fit between the outer ring of the bearing and the flange fork, ensures the normal operation of the cross shaft assembly, and extends the service life of the cross universal coupling. Attached Figure Description

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of this utility model. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0017] Figure 1 This is a structural schematic diagram of a cross shaft assembly in the prior art; Figure 2 This is a structural schematic diagram of the cross shaft assembly of this utility model; Figure 3 yes Figure 2 Enlarged view of part A; Figure 4 This is a schematic diagram of the structure of the flange fork of this utility model; Figure 5 This is a schematic diagram of the end cap structure of this utility model; Figure 6 This is a cross-sectional view of the end cap of this utility model; Figure 7 This is a schematic diagram of the screw plug of this utility model; Figure 8 This is a cross-sectional view of the screw plug of this utility model; Figure 9 This is a three-dimensional structural diagram of the cross shaft assembly of this utility model; Figure 10 This is a cross-sectional structural schematic diagram of the cross shaft assembly of this utility model; Explanation of markings in the diagram: 100, flange fork; 110, keyway; 120, threaded hole; 200. Cross shaft assembly; 210. Cross shaft body; 211. Shaft head; 212. Inner stop; 213. Lip seal; 214. Center hole; 220. Thrust bearing; 230. Bearing outer ring; 240. Flat key; 250. End cap; 251. Oil hole; 252. Oil nozzle; 253. Annular groove; 254. O-ring seal; 255. Bolt through hole; 256. Threaded hole; 257. Keyway; 258. Screw; 259. Nut; 260. Plug; 270. Roller bearing. Detailed Implementation

[0018] The following detailed description and exemplary embodiments of the present invention can be better understood in conjunction with the accompanying drawings, wherein the elements and features of the present invention are identified by reference numerals.

[0019] The following detailed description of exemplary embodiments of the present invention refers to the accompanying drawings, which form part of the description and illustrate exemplary embodiments of the present invention as examples. It should be understood that the following text is merely used to describe one or more specific embodiments of the present invention and does not strictly limit the scope of protection specifically claimed by the present invention. The structures, proportions, sizes, etc., depicted in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and purposes achieved by the present invention, should still fall within the scope of the technical content disclosed in the present invention. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are only for clarity of description and are not intended to limit the scope of implementation. Changes or adjustments in their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention.

[0020] like Figures 2 to 10 As shown, the cross shaft assembly 200 of this embodiment includes a cross shaft body 210, a thrust bearing 220, a bearing outer ring 230 for mounting the thrust bearing 220, a sealing assembly, and a connecting assembly. The end cap 250 is connected and fixed to the bearing outer ring 230 through the connecting assembly.

[0021] In this embodiment, as Figure 2 and Figure 3 As shown, the cross shaft body 210 has four shaft heads 211, each shaft head 211 is fitted with a roller bearing 270, the outer ring 230 of the bearing is fitted on the roller bearing 270 and sealed, and end caps 250 are provided on the four shaft heads 211; the sealing assembly includes a lip seal ring disposed between the shaft head 211 and the end cap 250 and an O-ring seal ring 254 disposed between the outer ring 230 of the bearing and the end cap 250.

[0022] exist Figure 2 and Figure 3 In this design, the connecting components include a screw 258 and a nut 259. The screw 258 has threads at both ends that mate with the nut 259, and a smooth rod structure in the middle. The cross shaft body 210 has two central holes 214 arranged symmetrically at 90°. The design of the two central holes 214 helps to optimize the force distribution of the cross shaft body 210 and improve its overall strength. The threaded portions at both ends of the screw 258 extend out of the central holes 214, and the smooth rod portion in the middle mates with the inner wall of the central holes 214, ensuring that the screw 258 can rotate flexibly or move axially within the central holes 214.

[0023] To avoid the component strength reduction problem caused by the 214-position center hole design, such as Figure 6 As shown, a bolt through hole 255 is provided in the end cover 250. The bolt through hole 255 is located on one side of the center line of the end cover 250 and is offset from the center of the end cover 250. A threaded hole 256 is provided in the end cover 250. The threaded hole 256 is located on one side of the center line of the end cover 250 and is offset from the center of the end cover 250. It is consistent with the center line of the bolt through hole 255. This non-centrally symmetrical hole design facilitates the connection of the end cover 250 with other components.

[0024] Furthermore, such as Figure 7 and Figure 8 As shown, a hexagonal head type plug 260 is fitted inside the threaded hole 256. The plug 260 can surround the screw 258 and nut 259 inside. The plug 260 can not only protect the screw 258 and nut 259 from damage caused by external collisions, corrosion, etc., but also further improve the sealing performance of the cross shaft assembly 200.

[0025] exist Figure 3 In the design, an inner stop 212 is provided on the shaft head 211, and a lip seal 213 is installed on the inner stop 212. The lip seal 213 has excellent sealing performance and can effectively prevent external impurities from entering the mating gap between the shaft head 211 and other components, while preventing internal grease leakage. An annular groove 253 is provided on the inner end face of the end cover 250. The annular groove 253 can be used to install an O-ring seal 254, thereby improving the sealing performance of the contact surface between the end cover 250 and the bearing outer ring 230.

[0026] Combination Figure 6 As shown, a stepped hole is formed inside the outer ring 230 of the bearing for installing the thrust bearing 220. The thrust bearing 220 is installed into the machined stepped hole inside the outer ring 230, ensuring accurate positioning and tight fit with the inner wall of the stepped hole without any misalignment or looseness, thus guaranteeing that the thrust bearing 220 can effectively withstand axial loads. Compared to traditional copper alloy adjusting shims ( Figure 1 As shown in the diagram, the thrust bearing 220 has a stronger load-bearing capacity, which can effectively reduce the problem of excessive axial clearance caused by component wear, and improve the overall operating stability and service life of the cross shaft assembly 200.

[0027] Meanwhile, the adjusting shim was replaced with a thrust bearing adapted to torque transmission, which improved the load-bearing capacity and reduced the axial clearance caused by the wear of the adjusting shim. The flange fork and cross shaft assembly were connected by bolts with a flat key, which avoided the phenomenon of the outer ring running due to interference fit, thereby extending the service life of the universal coupling.

[0028] exist Figure 5 and Figure 6 In the process, the end cap 250 has an oil hole 251, and an oil nozzle 252 is provided on the oil hole 251 for injecting oil into the thrust bearing 220. The oil nozzle 252 is used to periodically replenish the bearing with grease to ensure that the bearing is always in a good lubrication condition.

[0029] Combination Figure 4 , Figure 5 , Figure 6 , Figure 9 and Figure 10 As shown, this embodiment also provides a universal joint, including a flange fork 100 and a universal joint assembly 200, wherein the universal joint assembly 200 is the same as described above.

[0030] exist Figure 4 In the flange fork 100, a keyway 110 is provided below the bearing hole, and two threaded holes 120 are provided in the keyway 110. The keyway 110 provides an installation base for subsequent connection with other components via a flat key 240. At the same time, the two threaded holes 120 in the keyway 110 can be used to install bolts and other fasteners, further enhancing the connection stability between the flange fork 100 and the cross shaft assembly 200, and avoiding the occurrence of outer ring slippage due to interference fit issues.

[0031] exist Figure 5 and Figure 6 In the process, a keyway 257 is provided on the end cover 250. The keyway 257 is located on one side of the center line. The keyway 257 cooperates with the keyway 110 on the flange fork 100. A flat key 240 is provided. The flat key 240 realizes the precise positioning and torque transmission between the end cover 250 and the flange fork 100, further enhancing the stability of the universal joint.

[0032] This utility model addresses the problems of poor sealing performance, excessive axial clearance due to easy wear of the adjusting shim, and easy slippage of the bearing outer ring and flange fork in existing cross shaft assemblies. It ensures effective sealing and waterproofing performance of the cross shaft assembly, ensures sufficient lubrication of the bearing, improves load-bearing capacity, avoids outer ring slippage, and extends the service life of the universal coupling.

[0033] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited to this. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A cross shaft assembly (200), comprising a cross shaft body (210) having four shaft ends (211), characterized in that, It also includes a thrust bearing (220) and a bearing outer ring (230) for mounting the thrust bearing (220). End caps (250) are provided on the four shaft heads (211); The sealing assembly includes a lip seal (213) disposed between the shaft head (211) and the end cap (250) and an O-ring seal (254) disposed between the bearing outer ring (230) and the end cap (250). The connecting assembly includes a screw (258) and a nut (259). The screw (258) has threads at both ends that mate with the nut (259), and the middle part is a smooth rod structure. The cross shaft body (210) has two central holes (214) arranged symmetrically at 90°. The threaded portions at both ends of the screw (258) extend out of the central holes (214), and the smooth rod portion in the middle mates with the inner wall of the central holes (214). The end cap (250) is connected and fixed to the bearing outer ring (230) by a screw (258) and a nut (259).

2. The cross shaft assembly (200) according to claim 1, characterized in that, A bolt through hole (255) is provided in the end cap (250), the bolt through hole (255) is located on one side of the center line of the end cap (250) and is offset from the center position of the end cap (250); a threaded hole (256) is provided in the end cap (250), the threaded hole (256) is located on one side of the center line of the end cap (250) and is offset from the center position of the end cap (250), and is consistent with the center line of the bolt through hole (255).

3. The cross shaft assembly (200) according to claim 2, characterized in that, A screw plug (260) is fitted inside the threaded hole (256), which can surround the screw (258) and nut (259) inside.

4. The cross shaft assembly (200) according to claim 3, characterized in that, An inner stop (212) is provided on the shaft head (211), and a lip seal (213) is installed on the inner stop (212); an annular groove (253) is provided on the inner end face of the end cover (250), and the annular groove (253) can be used to install an O-ring seal (254).

5. The cross shaft assembly (200) according to claim 4, characterized in that, A stepped hole is provided inside the outer ring (230) of the bearing for installing the thrust bearing (220).

6. The cross shaft assembly (200) according to claim 5, characterized in that, The end cap (250) has an oil hole (251) and an oil injection nozzle (252) for injecting oil into the thrust bearing (220) is provided on the oil hole (251).

7. A universal joint comprising a flange fork (100) and a universal joint assembly (200), characterized in that, The cross shaft assembly (200) is the cross shaft assembly (200) according to any one of claims 1-6.

8. The universal joint according to claim 7, characterized in that, A keyway (110) is provided below the bearing hole of the flange fork (100), and two threaded holes (120) are provided in the keyway (110).

9. The universal joint according to claim 8, characterized in that, A keyway (257) is provided on the end cap (250). The keyway (257) is located on one side of the center line. The keyway (257) cooperates with the keyway (257) on the flange fork (100) and is provided with a flat key (240).

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