Sealing structure and universal coupling applying same

Abstract

The utility model relates to a sealing structure and a universal coupling applying the same, in particular to a sealing structure which comprises a tooth-shaped sealing part embedded in a spline housing of the universal coupling, a sealing tooth groove is formed in the tooth-shaped sealing part, and the sealing tooth groove is communicated with the spline housing. The shape of the section, perpendicular to the axis direction, of the sealing tooth groove is matched with the shape of a spline tooth of the universal coupling. And the pressing piece is fixed with a spline housing connected with the universal coupling and is used for pressing the tooth-shaped sealing piece. The coupling has the effect that the coupling can be stably lubricated by lubricating oil in the long-term use process.

Description

Technical Field

[0001] The present application relates to the technical field of couplings, and in particular to a sealing structure and a universal coupling using the same. Background Art

[0002] A universal coupling is a type of coupling that can connect two shafts with an angle between their axes and transmit torque and motion through a spline pair. Therefore, the spline pair needs to be lubricated for a long time during operation to achieve continuous rotation and transmit torque and motion.

[0003] In the related art, the universal coupling includes a connecting end and a locking assembly. There are two connecting ends, one connecting end is provided with a spline sleeve, and the other connecting end is provided with a spline shaft. The spline shaft and the spline sleeve are plugged in to form a circumferential limit on the axis, and the spline sleeve and the spline shaft are fixed and locked by a locking nut. In order to ensure that the spline pair on the coupling can maintain long-term lubrication, when selecting grease seals, wool felt is usually embedded in the inner wall of the spline sleeve to seal the oil grease, so that the grease can keep lubricating the spline pair.

[0004] Regarding the above-mentioned related technologies, when wool felt is used as a sealing structure to seal the lubricating grease, since the wool felt is not a complete sealing method, it will often wear out during installation and use, making it easy for the lubricating oil to leak out during use, which is not conducive to maintaining the stability of the coupling. Utility Model Content

[0005] In order to ensure that the coupling can be stably lubricated by lubricating oil during long-term use, the present application provides a sealing structure.

[0006] A sealing structure provided in this application adopts the following technical solution:

[0007] A sealing structure, comprising:

[0008] A toothed seal is embedded in the spline sleeve of the universal coupling, the toothed seal is provided with a sealing tooth groove, and the cross-sectional shape of the sealing tooth groove perpendicular to the axial direction is consistent with the shape of the spline teeth of the universal coupling;

[0009] A pressing piece is fixed to a spline sleeve connected to the universal coupling and is used to press the toothed seal.

[0010] By adopting the above technical solution, the toothed seal has sealing grooves so that when sealing the lubricating grease, the sealing grooves can fit the surface of the spline teeth, which helps to improve the sealing effect and makes it difficult for the lubricating grease to leak, so that the universal coupling can be stably lubricated during long-term use.

[0011] Optionally, the clamping member includes a clamping end cover and a locking screw, the clamping end cover is tightly fitted against the toothed seal, the locking screw passes through the clamping end cover and is connected to the universal coupling, and when the locking screw is tightened, the clamping end cover is driven to clamp the toothed seal onto the universal coupling.

[0012] By adopting the above technical solution, the compression end cover and the locking screw cooperate, and when the locking screw is tightened, the toothed seal can be firmly pressed onto the universal coupling, thereby maintaining the sealing of the lubricating grease and achieving effective sealing of the lubricating grease.

[0013] Optionally, a reinforced seal is further included, wherein the reinforced seal is embedded in the spline sleeve of the universal joint, and the reinforced seal is arranged on a side away from the toothed seal.

[0014] By adopting the above technical solution, when the reinforced seal is embedded in the spline sleeve of the universal coupling, it is located on the other side away from the toothed seal, so that the overall sealing effect is further increased, which helps to reduce the probability of lubricating grease leakage.

[0015] Optionally, the thickness of the reinforced seal along the axial direction is greater than the thickness of the toothed seal.

[0016] By adopting the above technical solution, when the thickness of the reinforced seal is greater than the thickness of the toothed seal, the sealing area can be further increased, so that the reinforced seal does not need to be fixed and locked by additional parts, making the installation steps easier.

[0017] Optionally, a sealing tooth surface is formed on the inner wall of the reinforced seal, and the sealing teeth are consistent with the spline teeth of the universal coupling in shape.

[0018] By adopting the above technical solution, the reinforced seal is provided with corresponding sealing tooth surfaces so that the reinforced seal can be in sealing contact with the spline teeth of the universal coupling, so that the reinforced seal can better seal the lubricating grease, which helps to improve the sealing effect.

[0019] The present application also provides a sealing structure, which is applied with the above sealing structure and adopts the following technical solution:

[0020] A universal coupling, comprising:

[0021] A spline sleeve, wherein the inner wall of the circumferential side is provided with a spline groove, and the inner wall of the spline groove is provided with an embedded ring groove, and the embedded ring groove is used for embedding the reinforced sealing member;

[0022] The spline shaft is plugged into the spline groove, the outer wall of the spline shaft is in contact with the inner wall of the spline sleeve to form a limit in the circumferential direction of the axis, and the outer wall of the spline shaft near the end is provided with a receiving ring groove, and the pressing member is inserted into the receiving ring groove to press the toothed seal against the end face of the spline sleeve;

[0023] A flange connector is provided at the corresponding ends of the spline shaft and the spline sleeve, and the flange connector is used to transmit torque to an external device.

[0024] By adopting the above technical scheme, the universal coupling is limited by setting an embedded ring groove and a reinforced seal to make the reinforced seal less likely to slide when sealing the lubricating grease. In addition, the receiving ring groove provides an installation space for the clamping piece, so that the clamping piece is not easy to protrude from the side of the universal coupling, thereby reducing the probability of the clamping piece being accidentally touched by foreign objects, so that the clamping piece can better compress the toothed seal, so that the universal coupling can better seal the lubricating grease, and has a better long-term sealing effect compared to sealing by using wool felt.

[0025] Optionally, an oil filling hole is opened on the surface of the spline sleeve, and the oil filling hole passes through the inner and outer walls of the spline sleeve. An oil cup is arranged in the oil filling hole, and the oil cup is used to seal or open the oil filling hole.

[0026] By adopting the above technical solution, the opening of the oil filling hole allows the staff to regularly add lubricating grease through the oil filling hole, so that the lubricating grease can be replenished in time after consumption, thereby further maintaining the lubrication of the spline and increasing the service life of the universal coupling.

[0027] Optionally, the oil filling hole includes a first channel and a second channel, the oil cup is embedded in and fixed to the inner wall of the first channel, and the second channel extends and surrounds the inner wall of the spline sleeve.

[0028] By adopting the above technical solution, the first channel and the second channel cooperate with each other, so that the lubricating grease injected into the oil filling hole can enter the second channel from the first channel and contact the spline, and the second channel can guide the lubricating grease to contact the spline evenly, which helps to improve the lubricating effect of the lubricating grease.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] 1. The toothed seal has a sealing groove, so that when the lubricating grease is sealed, the sealing groove can fit the surface of the spline teeth, which helps to improve the sealing effect and makes it difficult for the lubricating grease to leak, so that the universal coupling can be stably lubricated during long-term use;

[0031] 2. The reinforced seal is provided with a corresponding sealing tooth surface so that the reinforced seal can be in sealing contact with the spline teeth of the universal coupling, so that the reinforced seal can better seal the lubricating grease, which helps to improve the sealing effect;

[0032] 3. The universal coupling is limited by the establishment of embedded ring grooves and reinforced seals to prevent the reinforced seals from sliding when sealing the lubricating grease. In addition, the receiving ring groove provides installation space for the clamping piece, so that the clamping piece is not easy to protrude from the side of the universal coupling, thereby reducing the probability of the clamping piece being accidentally touched by foreign objects, so that the clamping piece can better compress the toothed seal, so that the universal coupling can better seal the lubricating grease. Compared with sealing with wool felt, it has better long-term sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of a universal coupling with a sealing structure used in this application.

[0034] Figure 2 It is a schematic cross-sectional structure diagram of a sealing structure in the present application when it is installed on a universal coupling and cut along the axial direction.

[0035] Figure 3 It is a schematic diagram of the overall structure of the toothed seal in this application.

[0036] Figure 4 yes Figure 2 Enlarged view of point A in the middle.

[0037] Figure 5 yes Figure 2 Schematic diagram of the local structure in.

[0038] Explanation of the reference numerals in the accompanying drawings: 1. Toothed seal; 11. Sealing tooth groove; 2. Pressing piece; 21. Pressing end cover; 22. Pressing screw; 3. Strong seal; 31. Sealing tooth surface; 4. Spline sleeve; 41. First cylinder; 411. Spline groove; 412. Oil filling hole; 4121. First channel; 4122. Second channel; 42. Second cylinder; 43. Storage ring groove; 44. Oil cup; 5. Spline shaft; 51. Spline teeth; 6. Flange connector. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-5 This application is described in further detail.

[0040] On the one hand, the embodiment of the present application discloses a sealing structure, which is applied to a universal coupling. Figure 1-3The sealing structure includes a toothed seal 1 and a pressing member 2. The toothed seal 1 is embedded in the spline sleeve 4 of the universal joint. The toothed seal 1 is provided with a sealing tooth groove 11. The shape of the sealing tooth groove 11 and the spline teeth 51 match each other, so that the toothed seal 1 can better seal the grease, making it difficult for the grease to leak, and the grease can lubricate the spline teeth 51 stably for a long time.

[0041] Reference Figure 2 and Figure 4 The pressing member 2 includes a pressing end cover 21 and a pressing screw 22. The pressing end cover 21 is arranged in a circular ring shape and is adapted to the spline sleeve 4 on the universal coupling, and can seal the gap between the spline sleeve 4 and the spline shaft 5. In addition, a corresponding through hole is provided on the pressing end cover 21, and the pressing screw 22 passes through the through hole and is threadedly connected to the spline sleeve 4, so that the pressing end cover 21 firmly presses the toothed seal 1 to limit the position.

[0042] Reference Figure 2 and Figure 3 and Figure 5 In order to further improve the sealing effect of the lubricating grease in the spline sleeve 4, a reinforced seal 3 is also provided. The reinforced seal 3 is annularly arranged and fixedly embedded in the spline sleeve 4. The reinforced seal 3 is spaced apart from the toothed seal 1 in the axial direction of the spline sleeve 4. The shape of the reinforced seal 3 is similar to the shape and structure of the toothed seal 1. A sealing tooth surface 31 is provided on the inner wall of the circumferential side of the reinforced seal 3. The sealing tooth surface 31 and the spline teeth 51 on the spline shaft 5 are consistent in shape, so that the reinforced seal 3 can cooperate with the toothed seal 1 to seal in two relative directions, thereby realizing long-term and stable sealing of the lubricating grease.

[0043] In addition, the thickness of the reinforced seal 3 in the axial direction of the spline sleeve 4 is greater than the thickness of the toothed seal 1. The spline sleeve 4 has a corresponding groove on the inner wall for the reinforced seal 3 to be embedded and the reinforced seal 3 is limited, so that the reinforced seal 3 can have a good structural strength and increase the contact area of ​​the reinforced seal 3 with the lubricating grease, so that the sealing effect is further improved, and no other parts are needed to fix and limit the reinforced seal 3. In this embodiment, the thickness of the reinforced seal 3 is twice the thickness of the toothed seal 1. In other embodiments, the thickness can also be other ratios.

[0044] The implementation principle of a sealing structure in an embodiment of the present application is: by using a clamping piece 2 to seal the lubricating grease with a toothed seal 1, and cooperating with a reinforced seal 3 to form a bidirectional seal, the lubricating grease can be stably sealed in two directions. Compared with sealing with wool felt, a more stable sealing performance can be provided, making it less likely for the lubricating grease to leak, so that the universal coupling can be lubricated stably for a long time during use.

[0045] On the other hand, the present application also discloses a universal coupling, which is applied with the sealing structure as described above, referring to Figure 2 The universal coupling comprises a spline sleeve 4, a spline shaft 5 and a flange connector 6. The outer wall of the spline shaft 5 is integrally provided with corresponding spline teeth 51, and the spline sleeve 4 is provided with a spline groove 411 adapted to the spline teeth 51, so that when the spline shaft 5 is inserted into the spline sleeve 4, the outer wall of the spline shaft 5 and the inner wall of the spline sleeve 4 form a limit in the circumferential direction of the axis.

[0046] It should be further explained that there are two flange connectors 6, one of which is fixedly connected to the end of the spline shaft 5 away from the spline sleeve 4, and the other flange connector 6 is fixedly connected to the end of the spline sleeve 4 away from the spline shaft 5. The two flange connectors 6 are used to connect to an external transmission mechanism. The specific external transmission mechanism is determined by the specific equipment and is not described in detail in this embodiment.

[0047] Reference Figure 2 and Figure 4 The spline sleeve 4 includes a first cylinder 41 and a second cylinder 42. The adjacent end surfaces of the first cylinder 41 and the second cylinder 42 are fixedly connected and coaxially arranged. One flange connector 6 is fixedly connected to the end of the second cylinder 42 away from the first cylinder 41. When the spline shaft 5 is inserted into the spline sleeve 4, a receiving annular groove 43 is formed between the spline sleeve 4 and the flange connector 6. The receiving annular groove 43 is used to embed and receive the pressing member 2 when it is installed, so that the pressing member 2 is not easy to protrude from the peripheral side surface of the spline sleeve 4, reducing the probability of the pressing member 2 being touched by foreign objects during use, and maintaining effective compression and sealing of the toothed seal 1.

[0048] Reference Figure 5 The surface of the first cylinder 41 is provided with an oil filling hole 412, which penetrates the inner and outer side walls of the first cylinder 41 and is used to add lubricating grease, so that the lubricating grease can be replenished in time after consumption, thereby extending the service life of the universal joint. In addition, in order to enable the oil filling hole 412 to be opened or sealed as needed, an oil cup 44 is detachably provided in the oil filling hole 412. The use of the oil cup 44 is a prior art in the art, and the specific structure of the oil cup 44 is not described in detail.

[0049] It should be further explained that the oil filling hole 412 includes a first channel 4121 and a second channel 4122. The first channel 4121 is embedded and connected and fixed with the oil cup 44, and the second channel 4122 extends toward the side away from the first channel 4121. The second channel 4122 is arranged to extend around the inner wall of the spline sleeve 4, so that the lubricating grease can enter the second channel 4122 through the oil cup 44 and be evenly lubricated along the circumference, which helps to improve the lubrication effect.

[0050] The implementation principle of a universal coupling in an embodiment of the present application is as follows: the first cylinder 41 is assembled with a toothed seal 1 and a reinforced seal 3 so that the lubricating grease in the first cylinder 41 can be better bidirectionally sealed, thereby preventing the lubricating grease from leaking easily. The lubricating grease lubricates the spline shaft 5 and the spline sleeve 4 for a long time and stably to increase the service life of the universal connecting shaft, and the lubricating grease can be replenished through the oil cup 44.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sealing structure, applied to a universal coupling, characterized in that: include: A toothed seal (1) is embedded in a spline sleeve (4) of a universal joint, wherein the toothed seal (1) is provided with a sealing tooth groove (11), and the cross-sectional shape of the sealing tooth groove (11) perpendicular to the axial direction matches the shape of the spline teeth (51) of the universal joint; A pressing piece (2) is fixed to a spline sleeve (4) connected to the universal coupling and is used to press the toothed seal (1).

2. A sealing structure according to claim 1, characterized in that: The clamping member (2) comprises a clamping end cover (21) and a clamping screw (22); the clamping end cover (21) is fitted and pressed against the toothed seal (1); the clamping screw (22) passes through the clamping end cover (21) and is connected to the spline sleeve (4) of the universal coupling; when the clamping screw (22) is tightened, the clamping end cover (21) is driven to press the toothed seal (1) onto the universal coupling.

3. A sealing structure according to claim 1, characterized in that: It also comprises a reinforced seal (3), wherein the reinforced seal (3) is embedded in a spline sleeve (4) of the universal joint, and the reinforced seal (3) is arranged on a side away from the toothed seal (1).

4. A sealing structure according to claim 3, characterized in that: The thickness of the reinforced seal (3) along the axial direction is greater than the thickness of the toothed seal (1).

5. A sealing structure according to claim 3, characterized in that: The inner wall of the reinforced seal (3) is provided with a sealing tooth surface (31), and the sealing tooth matches the spline tooth (51) of the universal joint in shape.

6. A universal coupling, using the sealing structure as described in any one of claims 1 to 5, characterized in that: include: The spline sleeve (4) has a spline groove (411) formed on its circumferential inner wall, and an embedded annular groove is formed on the inner wall of the spline groove (411), wherein the reinforced sealing member (3) is embedded in the embedded annular groove; The spline shaft (5) is plugged into the spline groove (411), the outer wall of the spline shaft (5) is in contact with the inner wall of the spline sleeve (4) to form a limit in the circumferential direction of the axis, and the outer wall of the spline shaft (5) near the end is provided with a receiving ring groove (43), and the receiving ring groove (43) is used for the pressing member (2) to be inserted and the toothed seal (1) is pressed against the end face of the spline sleeve (4); A flange connection piece (6) is arranged at corresponding ends of the spline shaft (5) and the spline sleeve (4), and the flange connection piece (6) is used to transmit torque to external equipment.

7. A universal coupling according to claim 6, characterized in that: An oil filling hole (412) is provided on the surface of the spline sleeve (4), and the oil filling hole (412) passes through the inner and outer walls of the spline sleeve (4). An oil cup (44) is provided in the oil filling hole (412), and the oil cup (44) is used to seal or open the oil filling hole (412).

8. A universal coupling according to claim 7, characterized in that: The oil filling hole (412) comprises a first channel (4121) and a second channel (4122); the oil cup (44) is embedded in and fixed to the inner wall of the first channel (4121); and the second channel (4122) extends along and surrounds the inner wall of the spline sleeve (4).

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