A sealing structure of a cross-axle type universal shaft

Abstract

The utility model discloses a kind of sealing structure of cross axle type universal shaft, including cross axle body, cross oil channel is equipped in the cross axle body, circular through slot is communicatively arranged between the cross axle body and cross oil channel, oil nozzle is fixedly inserted in the circular through slot, oil injection through slot is equipped in the oil nozzle, the one end of the oil nozzle away from the cross axle body is equipped with circular cavity, oil injection through slot and circular cavity are communicatively arranged.The utility model is fixed between oil injection through slot and conical hole by fixing circular-truncated-cone fixed block, so that the oil flow in circular cavity, oil injection through slot and conical hole is limited by cylindrical compression spring on cylindrical limiting rod and current-limiting ball, prevent the case of oil backflow leakage, by fixing sealing cap on oil nozzle and using annular washer to compress tightly seal, ensure that external water and dust and other impurities cannot invade the bearing inside cross axle body, further prevent the case of internal lubricating oil leakage.

Description

Technical Field

[0001] This utility model relates to the field of cross-type universal joint technology, and in particular to a sealing structure for a cross-type universal joint. Background Technology

[0002] A cross-type universal joint is a mechanical part used to transmit torque. It usually consists of two single universal ball couplings and a connecting shaft. Its core transmission component is the connection of two universal ball couplings through a cross-shaped shaft, which realizes the angle compensation between the shafts and the transmission of power. It can adapt to the transmission requirements where there is an angle between the two shafts and is widely used in automation equipment and other fields.

[0003] Existing cross-type universal joints lack a flow-limiting structure on the grease nipple of the cross shaft body during actual use, which easily leads to backflow and leakage of lubricating oil. In addition, the grease nipple lacks a sealing structure, which can easily cause lubricating oil leakage after long-term use. A sealing structure for cross-type universal joints is proposed to solve the above problems. Utility Model Content

[0004] To address the shortcomings and defects in the existing technology, this utility model proposes a sealing structure for a cross-shaped universal joint. This structure solves the technical problems in the prior art where the oil nozzle of the existing cross-shaped universal joint lacks a flow-limiting structure, which easily leads to backflow and leakage of lubricating oil, and the oil nozzle lacks a sealing structure, which easily causes lubricating oil leakage during long-term use.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A sealing structure for a cross-shaped universal joint includes a cross-shaped shaft body, a cross-shaped oil passage within the cross-shaped shaft body, a circular through groove connecting the cross-shaped shaft body and the cross-shaped oil passage, an oil nozzle fixedly inserted into the circular through groove, an oil inlet groove within the oil nozzle, a circular cavity at the end of the oil nozzle away from the cross-shaped shaft body, the oil inlet groove communicating with the circular cavity, a circular oil port at the end of the circular cavity and the oil nozzle away from the cross-shaped shaft body, a flow-limiting mechanism within the oil inlet groove, and a sealing cap at the end of the oil nozzle away from the cross-shaped shaft body.

[0006] Preferably, the circular through groove has an annular groove on its annular inner wall away from the cross oil passage, and the oil nozzle has an annular insert on its annular side wall near the cross shaft. The annular insert is fixedly embedded in the annular groove, and the annular insert and the oil nozzle are integrally cast.

[0007] Preferably, the end of the oil filling channel away from the sealing cap is provided with a conical channel, and the same frustum-shaped fixing block is fixedly connected between the oil filling channel and the conical channel. The flow limiting mechanism is disposed on the frustum-shaped fixing block, and the frustum-shaped fixing block is provided with a plurality of circular holes, which are arranged in a cross shape. All of the circular holes are connected to the oil filling channel and the conical channel.

[0008] Preferably, the flow limiting mechanism includes a cylindrical limiting rod fixedly connected to the side wall of the frustum-shaped fixing block away from the center of the conical channel. One end of the cylindrical limiting rod located in the circular cavity is movably sleeved with a flow limiting ball. A cylindrical compression spring is sleeved on the cylindrical limiting rod. The two ends of the cylindrical compression spring are fixedly connected to the frustum-shaped fixing block and the flow limiting ball, respectively. The flow limiting ball abuts and presses against the circular oil port.

[0009] Preferably, the cylindrical limiting rod, the flow-limiting ball, and the cylindrical compression spring are all made of alloy steel.

[0010] Preferably, the sealing cap has an internal thread on its annular inner wall, and the grease nipple has an external thread on its annular side wall away from the cross shaft. The external thread is threadedly connected to the internal thread. An annular washer is fixedly connected to the inner wall of the sealing cap opposite the grease nipple. The annular washer abuts and presses against the grease nipple. Both the frustum-shaped fixing block and the annular washer are made of nitrile rubber.

[0011] Compared with the prior art, the advantages of this utility model are as follows: 1. By fixing the frustum-shaped fixing block between the oil injection channel and the conical channel, the cylindrical compression spring on the cylindrical limiting rod, together with the flow limiting ball, restricts the oil flow in the circular cavity, the oil injection channel and the conical channel, thus preventing oil backflow and leakage.

[0012] 2. By fixing the sealing cap to the grease nipple and using a ring washer to press and seal, it is ensured that external water, dust and other impurities cannot enter the bearing of the cross shaft, further preventing internal lubricating oil leakage. Attached Figure Description

[0013] Figure 1 This is a perspective view of the sealing structure of a cross-shaped universal joint proposed in this utility model. Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a schematic diagram of the sealing structure of the oil nozzle, sealing cap, and annular insert of the cross-shaped universal joint proposed in this utility model. Figure 4 This is a schematic diagram of the sealing cap of a cross-shaped universal joint sealing structure proposed in this utility model; Figure 5 This is a schematic diagram of the flow-limiting mechanism of the sealing structure of the cross-shaped universal joint proposed in this utility model.

[0014] In the diagram: 1. Cross shaft body, 2. Cross oil passage, 3. Circular through groove, 4. Oil nozzle, 5. Oil injection through groove, 6. Circular cavity, 7. Circular oil port, 8. Sealing cap, 9. Annular groove, 10. Annular insert, 11. Conical channel, 12. Frustum-shaped fixing block, 13. Circular hole, 14. Columnar limit rod, 15. Flow limiting ball, 16. Cylindrical compression spring, 17. Internal thread, 18. Annular washer. Detailed Implementation

[0015] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] Reference Figure 1-5 A sealing structure for a cross-shaped universal joint includes a cross-shaped shaft body 1, a cross-shaped oil passage 2 inside the cross-shaped shaft body 1, a circular through groove 3 connecting the cross-shaped shaft body 1 and the cross-shaped oil passage 2, an oil nozzle 4 fixedly inserted in the circular through groove 3, an annular groove 9 on the annular inner wall of the circular through groove 3 away from the cross-shaped oil passage 2, and an annular insert 10 on the annular side wall of the oil nozzle 4 near the cross-shaped shaft body 1. The annular insert 10 is fixedly embedded in the annular groove 9. The annular insert 10 and the oil nozzle 4 are integrally cast. Inserting the annular insert 10 into the annular groove 9 and sealing it effectively positions the oil nozzle 4 on the cross-shaped shaft body 1. The oil nozzle 4 has a... There is an oil filling groove 5, and a conical channel 11 is provided at the end of the oil filling groove 5 away from the sealing cap 8. The same frustum-shaped fixing block 12 is fixedly connected between the oil filling groove 5 and the conical channel 11. A flow limiting mechanism is provided on the frustum-shaped fixing block 12. The frustum-shaped fixing block 12 is provided with several circular holes 13, which are arranged in a cross shape. The several circular holes 13 are all connected to the oil filling groove 5 and the conical channel 11. The lubricating oil entering the oil filling groove 5 is introduced into the conical channel 11 along the several cross-shaped circular holes 13 on the frustum-shaped fixing block 12, limiting the flow of lubricating oil and preventing backflow and leakage.

[0018] A circular cavity 6 is provided at one end of the nozzle 4 away from the cross shaft 1. An oil filling groove 5 is connected to the circular cavity 6. A circular oil port 7 is provided at the end of the circular cavity 6 and the nozzle 4 away from the cross shaft 1. A flow-limiting mechanism is provided within the oil filling groove 5. The flow-limiting mechanism includes a cylindrical limiting rod 14 fixedly connected to the side wall of the frustum-shaped fixing block 12 away from the center of the conical channel 11. One end of the cylindrical limiting rod 14, located within the circular cavity 6, is movably sleeved with a flow-limiting ball 15. A cylindrical compression spring 16 is sleeved on the cylindrical limiting rod 14. Both ends of the cylindrical compression spring 16 are fixedly connected to the frustum-shaped fixing block 12 and the flow-limiting ball 15, respectively. The flow-limiting ball 15 abuts and presses against the circular oil port 7. The cylindrical limiting rod 14, the flow-limiting ball 15, and the cylindrical compression spring 16 are all made of alloy steel. Lubricating oil is introduced into the circular oil port 7 using a syringe. The syringe head abuts against the flow-limiting ball 15, causing it to move along the cylindrical limiting rod 14 and compress the cylindrical compression spring 16. The injected lubricating oil flows into the oil filling channel 5 along the circular cavity 6. The lubricating oil in the oil filling channel 5 flows into the conical channel 11 through several cross-shaped circular holes 13 on the frustum-shaped fixing block 12. The cylindrical compression spring 16 on the cylindrical limiting rod 14, in conjunction with the flow-limiting ball 15, restricts the flow of oil in the circular cavity 6, the oil filling channel 5, and the conical channel 11. When the injection is completed and the syringe is withdrawn, the syringe head separates from the flow-limiting ball 15. The compressed cylindrical compression spring 16 elastically resets, causing the flow-limiting ball 15 to reset and press against the circular oil port 7, preventing the lubricating oil from flowing back and leaking.

[0019] A sealing cap 8 is provided at the end of the grease nipple 4 away from the cross shaft 1. The annular inner wall of the sealing cap 8 is provided with an internal thread 17, and the annular side wall of the grease nipple 4 away from the cross shaft 1 is provided with an external thread (not shown in the figure). The external thread is threadedly connected to the internal thread 17. The sealing cap 8 is re-connected to the grease nipple 4, so that the sealing cap 8 is fixed on the grease nipple 4 by cooperating with the internal thread 17 and the external thread (not shown in the figure). An annular washer 18 is fixedly connected to the inner wall of the sealing cap 8 opposite to the grease nipple 4. The annular washer 18 abuts and presses against the grease nipple 4. The frustum-shaped fixing block 12 and the annular washer 18 are both made of nitrile rubber. The nitrile rubber annular washer 18 can effectively provide a seal for the grease nipple 4, ensuring that external water and dust and other impurities cannot enter the bearing of the cross shaft 1, and further preventing internal lubricating oil leakage.

[0020] In use, the frustum-shaped fixing block 12 is fixed between the oil injection groove 5 and the conical channel 11. When lubricating oil needs to be injected, simply unscrew the sealing cap 8 and introduce the lubricating oil into the circular oil port 7 using a syringe. The syringe head abuts against the flow-limiting ball 15, causing it to move along the cylindrical limiting rod 14 and compress the cylindrical compression spring 16. The injected lubricating oil flows into the oil injection groove 5 along the circular cavity 6. The lubricating oil in the oil injection groove 5 flows into the conical channel 11 through several cross-shaped circular holes 13 on the frustum-shaped fixing block 12. The cylindrical compression spring 16 on the cylindrical limiting rod 14, in conjunction with the flow-limiting ball 15, restricts the circular cavity 6 and the oil injection groove. The flow rate of oil in the tapered channel 11 is controlled, and the lubricating oil slowly flows into the cross oil passage 2 along the circular through groove 3. When the injection is completed and the syringe is pulled out, the injection head separates from the flow limiting ball 15. The compressed cylindrical spring 16 elastically resets, causing the flow limiting ball 15 to reset and press against the circular oil port 7 to prevent the lubricating oil from flowing back and leaking. The sealing cap 8 is reconnected to the oil nozzle 4, so that the sealing cap 8 is fixed on the oil nozzle 4 with the internal thread 17 and the external thread (not shown in the figure) until the annular washer 18 presses against the oil nozzle 4 to seal, ensuring that external water and dust and other impurities cannot enter the bearing inside the cross shaft body 1, and further preventing the internal lubricating oil from leaking.

[0021] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sealing structure for a cross-shaped universal joint, comprising a cross-shaped shaft body (1), wherein the cross-shaped shaft body (1) is provided with a cross-shaped oil passage (2), characterized in that, A circular through groove (3) is provided between the cross shaft (1) and the cross oil passage (2). An oil nozzle (4) is fixedly inserted in the circular through groove (3). An oil injection groove (5) is provided in the oil nozzle (4). A circular cavity (6) is provided at one end of the oil nozzle (4) away from the cross shaft (1). The oil injection groove (5) is connected to the circular cavity (6). A circular oil port (7) is provided at one end of the circular cavity (6) and the oil nozzle (4) away from the cross shaft (1). A flow limiting mechanism is provided in the oil injection groove (5). A sealing cap (8) is provided at one end of the oil nozzle (4) away from the cross shaft (1).

2. The sealing structure of a cross-shaped universal joint according to claim 1, characterized in that, The circular through groove (3) is provided with an annular groove (9) on the annular inner wall away from the cross oil passage (2). The oil nozzle (4) is provided with an annular insert (10) on the annular side wall near the cross shaft body (1). The annular insert (10) is fixedly embedded in the annular groove (9). The annular insert (10) and the oil nozzle (4) are integrally cast.

3. The sealing structure of a cross-shaped universal joint according to claim 1, characterized in that, The oil filling channel (5) is provided with a conical channel (11) at one end away from the sealing cap (8). The oil filling channel (5) and the conical channel (11) are fixedly connected by the same frustum-shaped fixing block (12). The flow limiting mechanism is provided on the frustum-shaped fixing block (12). The frustum-shaped fixing block (12) is provided with a number of circular holes (13). The number of circular holes (13) are arranged in a cross shape. The number of circular holes (13) are all connected to the oil filling channel (5) and the conical channel (11).

4. The sealing structure of a cross-shaped universal joint according to claim 3, characterized in that, The flow limiting mechanism includes a cylindrical limiting rod (14) fixedly connected to the side wall of the frustum-shaped fixing block (12) away from the center of the conical channel (11). One end of the cylindrical limiting rod (14) located in the circular cavity (6) is movably sleeved with a flow limiting ball (15). A cylindrical compression spring (16) is sleeved on the cylindrical limiting rod (14). The two ends of the cylindrical compression spring (16) are fixedly connected to the frustum-shaped fixing block (12) and the flow limiting ball (15) respectively. The flow limiting ball (15) is pressed against the circular oil port (7).

5. The sealing structure of a cross-shaped universal joint according to claim 4, characterized in that, The cylindrical limiting rod (14), the flow limiting ball (15), and the cylindrical compression spring (16) are all made of alloy steel.

6. The sealing structure of a cross-shaped universal joint according to claim 3, characterized in that, The sealing cap (8) has an internal thread (17) on its annular inner wall, and the oil nozzle (4) has an external thread on its annular side wall away from the cross shaft (1). The external thread is threaded to the internal thread (17). An annular washer (18) is fixedly connected to the inner wall of the sealing cap (8) opposite to the oil nozzle (4). The annular washer (18) is pressed against the oil nozzle (4). The frustum-shaped fixing block (12) and the annular washer (18) are both made of nitrile rubber.

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