A connecting shaft assembly with a sealing structure

Abstract

The application relates to the technical field of automobile accessories, in particular to a connecting shaft assembly with a sealing structure, which comprises an inner flange and an outer flange plate, a first sealing element is arranged between the inner flange and the outer flange plate, the first sealing element comprises a framework part, a sealing body part and a sealing lip part, the sealing body part and the sealing lip part are annular and coaxial, the framework part comprises a first framework and a second framework, the first framework is embedded in the sealing body part, the second framework is integrally formed with the inner circumferential surface of the first framework, the sealing lip part is integrally formed with the sealing body part, the sealing lip part is detachably connected with the outer flange plate, and the second framework is detachably connected with the inner flange. Thus, the problem that mud enters the connecting shaft assembly when the existing connecting shaft assembly rotates relatively between a three-column groove shell and a sealing ring is solved.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, and more specifically, to a connecting shaft assembly with a sealing structure. Background Technology

[0002] The connecting shaft assembly is a joint component of the universal joint in an automotive transmission system, responsible for power transmission. Existing connecting shaft assemblies are prone to accumulating dirt and sand between the dust seal and the bearing bracket during use. Because the sealing lip of the internal sealing ring abuts against the three-post housing, and because the connecting shaft assembly experiences prolonged relative rotation between the sealing ring and the three-post housing during operation, the accumulated dirt and sand cause wear at the contact point between the sealing lip of the sealing ring and the three-post housing. This allows mud and water to enter the connecting shaft assembly, subsequently corroding internal components such as splines, leading to abnormal noise and reducing the service life of the connecting shaft assembly. Summary of the Invention

[0003] To address the problem of preventing mud and water from entering the interior of existing connecting shaft assemblies when relative rotation occurs between the three-column groove housing and the sealing ring, this invention provides a connecting shaft assembly with a sealing structure.

[0004] In a first aspect, the present invention provides a connecting shaft assembly with a sealing structure, comprising:

[0005] The flange includes an inner flange and an outer flange. A first sealing element is installed between the inner flange and the outer flange. The first sealing element includes a skeleton, a sealing body, and a sealing lip. The sealing body and the sealing lip are both annular and coaxial. The skeleton includes a first skeleton and a second skeleton. The first skeleton is embedded in the sealing body. The second skeleton is integrally formed with the inner circumferential surface of the first skeleton. The sealing lip is integrally formed with the sealing body. The sealing lip is detachably connected to the outer flange. The second skeleton is detachably connected to the inner flange.

[0006] In some embodiments, the sealing lip includes a first sealing lip and a second sealing lip, the first sealing lip and the second sealing lip being located on opposite sides of the first frame, the first sealing lip and the second sealing lip being detachably connected to the outer flange, and a first sealing storage chamber being formed between the sealing body, the first sealing lip, the second sealing lip and the outer flange.

[0007] In some embodiments, the second sealing lip is arranged at one end near the bearing, and the second sealing lip extends outward at the end away from the sealing body to form a guide lip. The guide lip extends radially inward along the connecting shaft in an inclined manner, and the distance between the guide lip and the first skeleton gradually increases from the end of the guide lip near the second sealing lip to the other end.

[0008] In some embodiments, the thickness of the guide lip gradually decreases from one end of the guide lip near the second sealing lip to the other end.

[0009] In some embodiments, the second sealing lip extends obliquely outward along the connecting shaft, and the second sealing lip forms an acute angle with the first skeleton. The distance between the first sealing lip and the second sealing lip gradually increases outward along the connecting shaft.

[0010] In some embodiments, the first sealing lip extends radially outward along the connecting shaft at an oblique angle, and the first sealing lip forms an acute angle with the first skeleton. The thickness of the first sealing lip gradually decreases from one end of the first sealing lip near the sealing body to the other end.

[0011] After the first seal is assembled, the distance from the inner circumferential surface of the first sealing lip to the second skeleton gradually increases from one end of the first sealing lip near the sealing body to the other end.

[0012] In some embodiments, the length ratio i between the first skeleton and the second skeleton is in the range of i≤2.

[0013] In some embodiments, the system further includes a bearing and a connecting shaft. The connecting shaft sequentially includes a fitting portion, a first protrusion, a second protrusion, and a connecting portion. The inner flange is movably fitted onto the fitting portion. The bearing is fixedly connected to the first protrusion, and the inner ring side portion of the bearing abuts against a first stepped surface. The first stepped surface is formed between the first protrusion and the second protrusion, and is arranged facing the side where the inner flange is located. The outer flange is fitted onto the bearing. A second seal is detachably connected to the second protrusion, and the second seal is located between the connecting shaft and the outer flange.

[0014] In some embodiments, a first central hole is provided in the middle of the outer flange, a third protrusion is formed on the left side of the first central hole, the bearing is sleeved in the first central hole, and the left end of the outer ring of the bearing abuts against the third protrusion, and the sealing lip is detachably connected to the third protrusion.

[0015] In some embodiments, a transition portion is formed on the connecting shaft between the fitting portion and the first protrusion. A limiting groove is recessed on the transition portion, and a sealing ring is installed in the limiting groove. The connecting shaft is sealed to the inner side of the inner flange through the sealing ring.

[0016] In some embodiments, a protective ring is provided on the outer side of the inner flange, and a flow guiding slope is provided on the outer side of the protective ring, the flow guiding slope extending toward the side where the outer flange is located;

[0017] Wherein, the distance between the outermost end of the guide slope and the axis of the connecting shaft is greater than or equal to the distance between the connection point of the sealing lip and the outer flange and the axis of the connecting shaft.

[0018] To address the problem of preventing mud and water from entering the internal structure of existing connecting shaft assemblies when relative rotation occurs between the three-column groove housing and the sealing ring, this invention offers the following advantages:

[0019] By utilizing the technical solution of this invention, the sealing lip of the first seal is detachably connected to the outer flange, and the second skeleton of the first seal is detachably connected to the inner flange. This allows the connecting shaft assembly to generate a long-term relative rotational motion between the first seal and the outer flange during operation. Consequently, no relative movement occurs between the inner flange and the first seal in areas prone to sediment accumulation, thus avoiding the situation where relative movement occurs in the sediment accumulation area, causing sediment to enter the connecting shaft assembly. Attached Figure Description

[0020] Figure 1 A schematic diagram of a connecting shaft assembly with a sealing structure is shown.

[0021] Figure 2 It shows Figure 1 The diagram shows the structure of the first seal.

[0022] Reference numerals: 1-Inner flange; 2-Guarding ring; 21-Guide slope; 3-First seal; 31-Sealing body; 32-First skeleton; 33-Second skeleton; 34-First sealing lip; 35-Second sealing lip; 36-Guide lip; 37-First sealing storage chamber; 4-Outer flange; 5-Bearing; 6-Second seal; 7-Connecting shaft; 8-Sealing ring. Detailed Implementation

[0023] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0024] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0025] This embodiment discloses a connecting shaft assembly with a sealing structure, such as Figure 1 and Figure 2 As shown, the connecting shaft assembly with a sealing structure is used in a universal joint transmission device in an automotive transmission system. It includes an inner flange 1 and an outer flange 4. A first sealing element 3 is installed between the inner flange 1 and the outer flange 4. The first sealing element 3 includes a skeleton part, a sealing body part 31, and a sealing lip. The sealing body part 31 and the sealing lip are both annular and coaxial. The skeleton part includes a first skeleton 32 and a second skeleton 33. The first skeleton 32 is embedded in the sealing body part 31. The second skeleton 33 is integrally formed with the inner circumferential surface of the first skeleton 32. The sealing lip is integrally formed with the sealing body part 31. The sealing lip is detachably connected to the outer flange 4. The second skeleton 33 is detachably connected to the inner flange 1.

[0026] In this embodiment, a connecting shaft assembly with a sealing structure is provided. The sealing lip of the first seal 3 is detachably connected to the outer flange 4. The first skeleton 32 of the first seal 3 is embedded in the sealing body 31. The second skeleton 33 is integrally formed with the inner circumferential surface of the first skeleton 32. The second skeleton 33 is detachably connected to the inner flange 1. During the operation of the connecting shaft assembly, the sealing lip of the first seal 3 and the outer flange 4 will generate a long-term relative rotational movement. This prevents relative movement between the inner flange 1 and the second skeleton 33 of the first seal 3 in areas where mud and sand are prone to accumulate. This avoids mud and sand accumulation areas and further reduces the occurrence of mud and sand entering the connecting shaft assembly from the second skeleton 33 in mud and sand accumulation areas.

[0027] like Figure 1 As shown, the connecting shaft assembly with a sealing structure includes an inner flange 1, a bearing 5, an outer flange 4, and a connecting shaft 7. The inner flange 1 is movably fitted onto the connecting shaft 7. The bearing 5 is fixedly connected to the connecting shaft 7 at one end near the inner flange 1. The outer flange 4 is fitted onto the bearing 5. A first sealing element 3 is installed between the inner flange 1 and the outer flange 4, and a second sealing element 6 is installed between the connecting shaft 7 and the outer flange 4. Both the first sealing element 3 and the second sealing element 6 are used to prevent mud and sand from entering the interior of the connecting shaft assembly.

[0028] Specifically, the connecting shaft 7 includes, in sequence, a fitting portion, a first protrusion, a second protrusion, and a connecting portion. The inner flange 1 is movably fitted onto the fitting portion, allowing axial movement of the inner flange 1 relative to the connecting shaft 7 via the fitting portion. In this application, the fitting portion can be configured as an external spline, and the right end of the inner flange 1 can be provided with an internal spline, allowing the connecting shaft 7 to be movably fitted through the internal spline of the inner flange 1 via the external spline, thus enabling axial relative movement between the inner flange 1 and the connecting shaft 7. The inner flange 1 can be a three-post groove shell, which, after being fitted with three ball pins, connects to the wheel hub in the automotive transmission system.

[0029] Specifically, the bearing 5 is fixedly connected to the first protrusion, and the inner ring side of the bearing 5 abuts against the first step surface to limit the bearing 5 along the axial direction of the connecting shaft 7 at the position of the first step surface. The first step surface is formed between the first protrusion and the second protrusion, and the first step surface is arranged facing the side where the inner flange 1 is located.

[0030] Specifically, the outer flange 4 is fitted onto the bearing 5. The outer flange 4 has a first central hole in its center. A third protrusion is formed on the left side of this first central hole, extending radially inward from the inner surface of the first central hole. A second stepped surface is formed at the junction of the third protrusion and the inner surface of the first central hole on the right side. In this application, the bearing 5 is fitted into the first central hole, and the left end of the outer ring of the bearing 5 abuts against the second stepped surface, thereby limiting the bearing 5 axially along the connecting shaft 7 to the position of the second stepped surface, thus completing the limiting installation of the bearing 5.

[0031] Specifically, the first sealing element 3 includes a skeleton portion, a sealing body portion 31, and a sealing lip portion. The sealing body portion 31 and the sealing lip portion are both annular and coaxial, with the sealing lip portion integrally formed with the sealing body portion 31. The skeleton portion provides support to enhance the overall structural strength of the first sealing element 3. In this application, the skeleton portion includes a first skeleton 32 and a second skeleton 33. The first skeleton 32 is embedded within the sealing body portion 31 to support the overall strength of the sealing body portion 31. The second skeleton 33 is integrally formed with the inner circumferential surface of the first skeleton 32 and is detachably connected to the inner flange 1. This allows the first sealing element 3 to achieve a tight connection with the inner flange 1 via the second skeleton 33. When the inner flange 1 rotates, the first sealing element 3 also rotates, achieving coaxial movement. Simultaneously, the sealing lip portion is detachably connected to the outer flange 4. Due to the tight connection... Both the sealing body 31 and the sealing lip are made of rubber, and the outer flange 4 is connected to the gearbox housing. Therefore, when the inner flange 1 rotates, the first sealing element 3 can rotate relative to the outer flange 4 through the sealing lip. This means that during operation, the connecting shaft assembly generates a prolonged relative rotational motion between the first sealing element 3 and the outer flange 4. Consequently, no relative movement occurs between the inner flange 1 and the first sealing element 3 in areas prone to sediment accumulation, thus preventing sediment from entering the connecting shaft assembly due to relative movement in sediment accumulation areas. In this application, the outer flange 4 can be a bearing bracket for connection to the gearbox housing.

[0032] Specifically, the sealing lip of the first seal 3 is detachably connected to the third protrusion of the outer flange 4 to prevent dirt and sand from entering the interior of the connecting shaft assembly from the left side of the connecting shaft assembly located at the inner flange 1. The second seal 6 is detachably connected to the second protrusion, such that the second seal 6 is located between the connecting shaft 7 and the outer flange 4, to prevent dirt and sand from entering the interior of the connecting shaft assembly from the right side of the connecting shaft assembly located at the outer flange 4. In this application, the connecting shaft 7 is connected to the vehicle differential via a connecting part to achieve power transmission.

[0033] In some embodiments, such as Figure 2As shown, the sealing lip includes a first sealing lip 34 and a second sealing lip 35. The first sealing lip 34 and the second sealing lip 35 are located on opposite sides of the first frame 32, allowing them to be detachably connected to the outer flange 4. Specifically, the first sealing lip 34 and the second sealing lip 35 abut against the third protrusion of the outer flange 4, ensuring that the sealing lip of the first sealing element 3 abuts against the outer flange 4 at at least two points, thus improving sealing efficiency. Meanwhile, by forming a first sealing storage chamber 37 between the sealing body 31, the first sealing lip 34, the second sealing lip 35 and the outer flange 4, when too much mud and sand accumulate in the mud and sand accumulation area between the inner flange 1 and the first sealing element 3, some mud and sand will accumulate at the abutment position between the outer flange 4 and the first sealing element 3. Even if some mud and sand enters by rotating and wearing the first sealing lip 34, the entered mud and sand can flow into the first sealing storage chamber 37 for storage. When the connecting shaft assembly is not in working condition, the mud and sand can also flow out through the channel formed by the rotational wear of the first sealing lip 34, further improving the sealing effect.

[0034] Furthermore, the second sealing lip 35 is arranged at one end near the bearing 5, and a guide lip 36 extends outward from the end of the second sealing lip 35 away from the sealing body 31. The guide lip 36 extends radially inward along the connecting shaft 7 at an inclined angle, and the distance between the guide lip 36 and the first frame 32 gradually increases from the end of the guide lip 36 near the second sealing lip 35 to the other end. In this application, with the above structural arrangement, when the inner flange 1 equipped with the first sealing element 3 is assembled with the outer flange 4, the guide lip 36 can be provided to quickly guide the sealing lip of the first sealing element 3 into the first central hole of the outer flange 4, thereby quickly achieving contact between the second sealing lip 35 and the third protrusion. This improves assembly efficiency.

[0035] Furthermore, the thickness of the guide lip 36 gradually decreases from one end of the guide lip 36 near the second sealing lip 35 to the other end. In this application, with the above arrangement, when the first sealing element 3 is assembled onto the inner surface of the third protrusion of the outer flange 4, since the thickness of the guide lip 36 gradually decreases from one end of the guide lip 36 near the second sealing lip 35 to the other end, and conversely, the thickness of the guide lip 36 gradually increases from the guide installation end to the end of the second sealing lip 35 (i.e., in opposite directions), the force between the guide lip 36 and the outer flange 4 is enhanced during the guide installation process. Consequently, when the second sealing lip 35 abuts against the outer flange 4, there is a certain force between the first sealing element 3 and the outer flange 4, thereby improving the sealing effect.

[0036] Furthermore, the second sealing lip 35 extends obliquely outward along the radial direction of the connecting shaft 7, forming an acute angle with the first frame 32. The distance between the first sealing lip 34 and the second sealing lip 35 gradually increases outward along the radial direction of the connecting shaft 7. In this application, through the above arrangement, the first sealing storage chamber 37 between the sealing body 31, the first sealing lip 34, the second sealing lip 35, and the outer flange 4 can have a larger storage space, improving storage efficiency. This reduces the likelihood of mud and sand entering the first sealing storage chamber 37 moving to the contact position between the second sealing lip 35 and the third protrusion, thus preventing further wear on the second sealing lip 35 and increasing the service life of the first seal 3.

[0037] Furthermore, the first sealing lip 34 extends radially outward along the connecting shaft 7 at an inclined angle, and forms an acute angle between the first sealing lip 34 and the first skeleton 32. The thickness of the first sealing lip 34 gradually decreases from one end near the sealing body 31 to the other end. In this application, the connection strength between the first sealing lip 34 and the sealing body 31 can be improved through the above arrangement. Since the thickness of the first sealing lip 34 gradually decreases as it extends outward from one end of the sealing body 31, when the thinner end of the first sealing lip 34 abuts against the third protrusion, there is a certain force between the first sealing lip 34 of the first sealing member 3 and the outer flange 4. This force only plays a certain sealing role, and this force does not restrict the first sealing member 3 from rotating relative to the outer flange 4.

[0038] Furthermore, after the first seal 3 is assembled, the distance from the inner circumferential surface of the first sealing lip 34 to the second skeleton 33 gradually increases from one end of the first sealing lip 34 near the sealing body 31 to the other end. In this application, through the above arrangement, the mud and sand accumulated in the mud and sand accumulation area between the inner flange 1 and the first seal 3 can be guided through the first sealing lip 34 and flow out to the outside of the connecting shaft assembly, thereby reducing the amount of mud and sand accumulation in the mud and sand accumulation area, thereby slowing down the accumulation of mud and sand at the connection position between the first sealing lip 34 and the outer flange 4, and reducing the risk of wear on the first sealing lip 34.

[0039] Furthermore, to enhance the connection stability between the second frame 33 and the inner flange 1, the length between the first frame 32 and the second frame 33 needs to be adjusted accordingly. The length ratio i between the first frame 32 and the second frame 33 is in the range of i ≤ 2, and preferably 0.5 ≤ i ≤ 2 in this application.

[0040] In some embodiments, a transition portion is formed on the connecting shaft 7 between the fitting portion and the first protrusion. A limiting groove is recessed in the transition portion, and a sealing ring 8 is installed within the limiting groove. The connecting shaft 7 is sealed to the inner side of the inner flange 1 via the sealing ring 8. In this application, the above-described structure allows for further restriction of mud and sand from entering the connecting shaft assembly when the first sealing ring 8 breaks through, thus improving protection efficiency. In this application, since the inner flange 1 can move axially relative to the connecting shaft 7 through the fitting part, the sealing ring 8 can be set as an "O" type sealing ring 8 or a "V" type sealing ring 8. A clearance space can be formed at the position of the "O" type sealing ring 8 or the "V" type sealing ring 8 near the inner surface of the inner flange 1. When there is relative movement between the inner flange 1 and the connecting shaft 7, the "O" type sealing ring 8 or the "V" type sealing ring 8 can deform sufficiently relative to the clearance space. This ensures that there is a certain sealing effect when there is relative movement between the inner flange 1 and the connecting shaft 7, and prevents the sealing ring 8 from not deforming sufficiently due to the lack of clearance space. This would force the internal stress to concentrate at the contact point between the sealing ring 8 and the inner side of the inner flange 1, resulting in excessive force that hinders the relative movement between the connecting shaft 7 and the inner flange 1 and reduces the effectiveness of the connecting shaft assembly.

[0041] In some embodiments, a protective ring 2 is provided on the outer side of the inner flange 1, and a guide slope 21 is provided on the outer side of the protective ring 2. The guide slope 21 extends toward the side where the outer flange 4 is located. The distance between the outermost end of the guide slope 21 and the axis of the connecting shaft 7 is greater than or equal to the distance between the connection between the sealing lip and the outer flange 4 and the axis of the connecting shaft 7.

[0042] Specifically, because the first seal 3 is recessed towards the side where the bearing 5 is located, some mud and sand can easily accumulate in the mud and sand accumulation area between the inner flange 1 and the first seal 3 during vehicle operation. The mud and sand can easily cause friction on the sealing lip of the first seal 3, affecting its service life. To prevent mud and sand from accumulating in the mud and sand accumulation area, a protective ring 2 is provided at the front end of the first seal 3. The maximum diameter of the protective ring 2 is larger than the diameter of the first central hole located at the third protrusion. By covering the opening between the inner flange 1 and the outer flange 4 with the protective ring 2, mud and sand are prevented from adhering to the mud and sand accumulation area formed by the first frame 32 and the second frame 33, thereby reducing the risk of cracking of the sealing lip of the first seal 3, increasing the service life of the first seal 3, and increasing the service life of the connecting shaft assembly.

[0043] The protective ring 2 includes two sets of protective rings, a flow guiding connection, and a flow guiding ring. The flow guiding ring is connected to the two sets of protective rings via the flow guiding connection. The two sets of protective rings are fixedly installed on the inner flange 1. The cross-section of the connection between the two sets of protective rings and the flow guiding connection is L-shaped to provide a certain supporting force to the flow guiding connection, thereby increasing the strength of the flow guiding ring and ensuring that the protective ring 2 can block large particles of mud and sand, preventing them from entering the location of the first sealing element 3, and ensuring that the protective ring 2 has strong protective performance. In this application, the flow guiding slope 21 is set on the outer surface of the flow guiding ring, which can guide the mud and sand, further preventing the mud and sand from entering the location of the first sealing element 3.

[0044] In summary, through the above structural design, the sealing lip of the first seal is detachably connected to the outer flange, and the second skeleton of the first seal is detachably connected to the inner flange. This allows the first seal and the outer flange to undergo long-term relative rotational motion during operation of the shaft assembly. Consequently, no relative movement occurs between the inner flange and the first seal in areas prone to sediment accumulation, thus avoiding the situation where relative movement occurs in sediment accumulation areas, preventing sediment from entering the shaft assembly.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A connecting shaft assembly with a sealing structure, characterized in that, include: The flange includes an inner flange and an outer flange. A first sealing element is installed between the inner flange and the outer flange. The first sealing element includes a skeleton part, a sealing body part, and a sealing lip part. The sealing body part and the sealing lip part are both annular and coaxial. The skeleton part includes a first skeleton and a second skeleton. The first skeleton is embedded in the sealing body part. The second skeleton is integrally formed with the inner circumferential surface of the first skeleton. The sealing lip part is integrally formed with the sealing body part. The sealing lip part is detachably connected to the outer flange. The second skeleton part is detachably connected to the inner flange. The sealing lip includes a first sealing lip and a second sealing lip, which are located on opposite sides of the first frame. The first sealing lip and the second sealing lip are detachably connected to the outer flange. A first sealing storage chamber is formed between the sealing body, the first sealing lip, the second sealing lip and the outer flange. During operation, the sealing lip and the outer flange of the connecting shaft assembly rotate relative to each other, while there is no relative movement between the inner flange and the second frame.

2. The connecting shaft assembly with a sealing structure as described in claim 1, characterized in that, The second sealing lip is arranged at one end near the bearing, and the second sealing lip extends outward at the other end away from the sealing body to form a guide lip. The guide lip extends inward at an angle along the radial direction of the connecting shaft, and the distance between the guide lip and the first skeleton gradually increases from the end of the guide lip near the second sealing lip to the other end.

3. The connecting shaft assembly with a sealing structure as described in claim 2, characterized in that, The thickness of the guide lip gradually decreases from one end near the second sealing lip to the other end.

4. The connecting shaft assembly with a sealing structure as described in claim 1, characterized in that, The second sealing lip extends outward at an angle along the radial direction of the connecting shaft, and the second sealing lip forms an acute angle with the first skeleton. The distance between the first sealing lip and the second sealing lip gradually increases outward along the radial direction of the connecting shaft.

5. The connecting shaft assembly with a sealing structure as described in claim 1, characterized in that, The first sealing lip extends outward radially along the connecting shaft at an angle that is acute. The thickness of the first sealing lip gradually decreases from one end of the first sealing lip near the sealing body to the other end. After the first seal is assembled, the distance from the inner circumferential surface of the first sealing lip to the second skeleton gradually increases from one end of the first sealing lip near the sealing body to the other end.

6. The connecting shaft assembly with a sealing structure as described in claim 1, characterized in that, The length ratio i between the first skeleton and the second skeleton is in the range of i≤2.

7. The connecting shaft assembly with a sealing structure as described in claim 1, characterized in that, It also includes a bearing and a connecting shaft. The connecting shaft includes, in sequence, a fitting part, a first protrusion, a second protrusion, and a connecting part. The inner flange is movably fitted onto the fitting part. The bearing is fixedly connected to the first protrusion, and the inner ring side of the bearing abuts against the first stepped surface. The first stepped surface is formed between the first protrusion and the second protrusion, and is arranged facing the side where the inner flange is located. The outer flange is fitted onto the bearing. A second seal is detachably connected to the second protrusion, and the second seal is located between the connecting shaft and the outer flange.

8. The connecting shaft assembly with a sealing structure as described in claim 7, characterized in that, The outer flange has a first central hole in the middle, and a third protrusion is formed on the left side of the first central hole. The bearing is sleeved in the first central hole, and the left end of the outer ring of the bearing abuts against the third protrusion. The sealing lip is detachably connected to the third protrusion.

9. The connecting shaft assembly with a sealing structure as described in claim 7, characterized in that, A transition portion is also formed on the connecting shaft between the fitting portion and the first protrusion portion. A limiting groove is recessed on the transition portion, and a sealing ring is installed in the limiting groove. The connecting shaft is sealed to the inner side of the inner flange through the sealing ring.

10. The connecting shaft assembly with a sealing structure as described in claim 7, characterized in that, The inner flange is covered with a protective ring on the outside, and the outer side of the protective ring is provided with a flow guiding slope, which extends toward the side where the outer flange is located. Wherein, the distance between the outermost end of the guide slope and the axis of the connecting shaft is greater than or equal to the distance between the connection point of the sealing lip and the outer flange and the axis of the connecting shaft.

Images