Cross-shaped assembly structure with multiple sealing valve cavity components

Abstract

This utility model discloses a cross shaft assembly structure with multiple sealing valve cavities, including a cross shaft body, four ends of which are journals, and needle roller bearings are sleeved on the outer surface of the journals. This utility model relates to the field of cross shaft assembly technology. This cross shaft assembly structure with multiple sealing valve cavities integrates a main sealing valve, a secondary sealing valve, and a built-in elastic component to construct a highly efficient sealing system. The main sealing valve and the secondary sealing valve form a double sealing surface. Combined with the weather resistance of the fluororubber material, it effectively prevents external impurities from intruding and internal lubricating oil from leaking. Simultaneously, the elastic component, through a ring spring, pushes a ring-shaped component, utilizing the contact structure between the tapered end and the tapered groove to provide continuous radial pressure to the main sealing valve, ensuring that the main sealing valve and the journal are always in an interference fit. Even if the journal experiences slight radial runout, the sealing effect can still be maintained, adapting to vibration and temperature changes under complex working conditions.

Description

Technical Field

[0001] This utility model relates to the field of cross shaft assembly technology, specifically a cross shaft assembly structure with multiple sealing valve cavity components. Background Technology

[0002] The reference patent title is: A universal joint assembly with a high sealing structure (Authorization Announcement No.: CN214578429U, Authorization Announcement Date: 2021.11.02). It includes a first connecting shaft, with a first universal joint fork rotatably connected to the right end of the first connecting shaft. A second universal joint fork is provided on the right side of the first universal joint fork. A second connecting shaft is rotatably connected to the right housing of the second universal joint fork, and the second universal joint fork is connected to the first universal joint fork via the cross shaft body. A first sealing ring is fixedly sleeved on the inner ring of both housings of the first and second universal joint forks. The inner ring of the first sealing ring is rotatably sleeved on the outer ring of the cross shaft body. A second sealing ring is movably sleeved on each of the four outer rings of the cross shaft body. A retaining ring is fixedly sleeved on the outer ring of the second sealing ring. All four retaining rings are located inside the first and second universal joint forks. This invention can improve the sealing performance of the equipment, allowing the lubricating oil to provide sufficient lubrication and avoiding waste of lubricating oil.

[0003] Based on the above document, the cross shaft assembly is the core component of the universal coupling. Its main function is to realize the power transmission between different axes. It is widely used in automotive drive shafts, hydraulic systems of engineering machinery, and other scenarios. The structure of the existing cross shaft assembly usually includes the cross shaft body, journal, needle roller bearing and bearing cover. Among them, the sealing structure between the bearing cover and the journal is the key component that affects its service life.

[0004] Currently, most cross shaft assemblies on the market use a single sealing lip or ordinary sealing ring design for their sealing structure, which has the following defects: First, the fit between the seal and the journal is easily affected by vibration and temperature changes, and the seal is prone to failure after long-term use, resulting in external dust and impurities entering the needle roller bearing, while internal lubricating oil leakage exacerbates component wear; Second, the existing sealing structure lacks an elastic compensation mechanism. When the journal experiences a slight radial runout due to assembly errors or wear, the seal cannot adaptively adjust, further reducing sealing reliability. Therefore, this utility model provides a cross shaft assembly structure with multiple sealing valve cavity components. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a cross shaft assembly structure with multiple sealing valve cavity components, which solves the problem of poor sealing reliability in existing cross shaft assemblies.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cross shaft assembly structure with multiple sealing valve cavity components, comprising a cross shaft body, four ends of which are journals, a needle roller bearing sleeved on the outer surface of the journal, a bearing cover on the outer surface of the needle roller bearing, a main sealing groove and a secondary sealing groove on the inner end of the bearing cover, a sealing valve cavity assembly between the bearing cover and the journal, the sealing valve cavity assembly comprising a cavity seat, a main sealing valve, and a secondary sealing valve, the cavity seat being fixedly mounted on the surface of the journal, the inner surface of the main sealing valve being interference-fitted with the outer surface of the journal, one side of the main sealing valve being tightly fitted with one side of the secondary sealing valve, the main sealing valve being adapted to the main sealing groove, the secondary sealing valve being adapted to the secondary sealing groove, and an elastic component being provided inside the cavity seat.

[0007] Preferably, both the main sealing flap and the secondary sealing flap are made of fluororubber.

[0008] Preferably, the elastic component includes an annular member slidably installed inside the cavity seat, one end of the annular member being fixedly connected to an annular spring, and one end of the annular spring being fixedly connected to the inner wall of the cavity seat.

[0009] Preferably, the other end of the annular component is configured as a conical end, and a conical groove adapted to the conical end is provided on the other side of the main sealing flap.

[0010] Preferably, the surface of the cross shaft body is provided with an oil inlet, the inner surface of the oil inlet is threaded with a sealing plug, and an oil storage cavity is provided inside the cross shaft body, which is connected to the oil inlet.

[0011] Preferably, the journal surface is provided with an oil outlet, the oil outlet is located inside the needle roller bearing, and the oil outlet is connected to the oil storage chamber through an oil outlet pipe.

[0012] Beneficial effects

[0013] This invention provides a cross-shaft assembly structure with multiple sealing valve cavity components. Compared with the prior art, it has the following advantages:

[0014] 1. This cross shaft assembly structure with multiple sealing valve cavities integrates a main sealing valve, a secondary sealing valve, and a built-in elastic component to construct a high-efficiency sealing system. The main sealing valve and the secondary sealing valve form a double sealing surface. Combined with the weather resistance of the fluororubber material, it effectively prevents external impurities from entering and internal lubricating oil from leaking. At the same time, the elastic component pushes the annular part through a ring spring. Utilizing the fit structure between the tapered end and the tapered groove, it provides continuous radial pressure to the main sealing valve, ensuring that the main sealing valve and the journal are always in an interference fit. Even if there is a slight radial runout of the journal, the sealing effect can still be maintained, adapting to vibration and temperature changes under complex working conditions.

[0015] 2. The cross shaft assembly structure with multiple sealing valve cavities has an oil reservoir inside the cross shaft body connected to the oil outlet of the journal through an oil outlet pipe. Sufficient lubricating oil can be injected at once, and the needle roller bearing is continuously supplied with oil through the oil outlet, eliminating the need for frequent external oiling. At the same time, the reliability of the sealing structure prevents lubricating oil leakage, further ensuring continuous lubrication, significantly reducing the wear rate of the needle roller bearing, and extending the service life of the cross shaft assembly. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the external structure of this utility model;

[0017] Figure 2 This is a three-dimensional structural diagram of the cross shaft body of this utility model;

[0018] Figure 3 This is a cross-sectional view of the internal structure of the cross shaft body of this utility model;

[0019] Figure 4 This is an exploded structural diagram of the sealing valve cavity assembly of this utility model;

[0020] Figure 5 This is an exploded structural diagram of the journal and bearing cap of this utility model.

[0021] In the diagram: 1-cross shaft body, 2-journal, 3-needle roller bearing, 4-bearing cap, 5-main sealing groove, 6-secondary sealing groove, 7-sealing flap cavity assembly, 71-cavity seat, 72-main sealing flap, 73-secondary sealing flap, 74-elastic component, 741-ring part, 742-ring spring, 8-conical groove, 9-oil inlet, 10-sealing plug, 11-oil reservoir, 12-oil outlet, 13-oil outlet pipe. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-5 This utility model provides a technical solution:

[0024] A cross shaft assembly structure with multiple sealing valve cavity components includes a cross shaft body 1, four ends of the cross shaft body 1 are journals 2, the outer surface of the journals 2 is fitted with needle roller bearings 3, the outer surface of the needle roller bearings 3 is provided with bearing caps 4, the inner end of the bearing caps 4 is provided with a main sealing groove 5 and a secondary sealing groove 6, and a sealing valve cavity assembly 7 is provided between the bearing caps 4 and the journals 2. The sealing valve cavity assembly 7 includes a cavity seat 71, a main sealing valve 72, and a secondary sealing valve 73. The cavity seat 71 is fixedly installed on the surface of the journals 2. The inner surface of the main sealing valve 72 is interference-fitted with the outer surface of the journals 2. One side of the main sealing valve 72 is tightly fitted with one side of the secondary sealing valve 73. The main sealing valve 72 is adapted to the main sealing groove 5, and the secondary sealing valve 73 is adapted to the secondary sealing groove 6. An elastic component 74 is provided inside the cavity seat 71.

[0025] Both the bearing cover 4 and the journal 2 are provided with four sets, and a sealing valve cavity assembly 7 is provided between each set, forming a multiple sealing valve cavity assembly structure;

[0026] The bearing cap 4 is adapted to the end of the cross shaft body 1;

[0027] By integrating the main sealing flap 12, the secondary sealing flap 73, and the built-in elastic component 74, a high-efficiency sealing system is constructed. The main sealing flap 72 and the secondary sealing flap 73 form a double sealing surface. Combined with the weather resistance of the fluororubber material, it effectively prevents external impurities from entering and internal lubricating oil from leaking. At the same time, the elastic component 74 pushes the annular part 741 through the ring spring 742. Utilizing the fit structure between the conical end and the conical groove 8, it provides continuous radial pressure to the main sealing flap, ensuring that the main sealing flap 72 and the journal 2 are always in an interference fit. Even if the journal 2 experiences a slight radial runout, it can still maintain the sealing effect and adapt to vibration and temperature changes under complex working conditions.

[0028] In this embodiment, both the main sealing flap 72 and the secondary sealing flap 73 are made of fluororubber.

[0029] The main sealing flap 72 and the secondary sealing flap 73 are oil-resistant, high-temperature resistant and anti-aging.

[0030] In this embodiment, the elastic component 74 includes an annular component 741 that is slidably installed inside the cavity seat 71. One end of the annular component 741 is fixedly connected to an annular spring 742, and one end of the annular spring 742 is fixedly connected to the inner wall of the cavity seat 71.

[0031] The ring spring 742 pushes the ring part 741, so that the main sealing flap 72 is always in close contact with the journal 2, and the main sealing flap 72 and the secondary sealing flap 73 are respectively in close contact with the inner surfaces of the main sealing groove 5 and the secondary sealing groove 6.

[0032] In this embodiment, the other end of the annular component 741 is set as a conical end, and the other side of the main sealing flap 72 is provided with a conical groove 8 that matches the conical end.

[0033] In this embodiment, the surface of the cross shaft body 1 is provided with an oil inlet 9, the inner surface of the oil inlet 9 is threaded with a sealing plug 10, and the interior of the cross shaft body 1 is provided with an oil storage cavity 11, which is connected to the oil inlet 9.

[0034] In this embodiment, an oil outlet 12 is provided on the surface of the journal 2. The oil outlet 12 is located inside the needle roller bearing 3 and is connected to the oil storage chamber 11 through the oil outlet pipe 13.

[0035] During operation, under the action of centrifugal force of the cross shaft body 1, the lubricating oil in the oil storage chamber 11 will be injected into the inner side of the needle roller bearing 3 through the oil outlet channel 13 and the oil outlet 12, that is, between the needle roller bearing 3 and the journal 2.

[0036] The oil reservoir 11 inside the cross shaft body 1 is connected to the oil outlet 12 of the journal 2 through the oil outlet pipe 13, which can inject a sufficient amount of lubricating oil at one time and continuously supply oil to the needle roller bearing 3 through the oil outlet 12 without the need for frequent external oiling. At the same time, the reliability of the sealing structure avoids lubricating oil leakage, further ensuring continuous lubrication, significantly reducing the wear rate of the needle roller bearing 3, and extending the service life of the cross shaft assembly.

[0037] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0038] The assembly process is as follows:

[0039] First, the needle roller bearing 3 is coaxially fitted onto the outer surface of the journal 2, ensuring that the inner ring of the needle roller bearing 3 fits tightly against the journal 2. The main sealing flap 72 is installed in the main sealing groove 5, and the secondary sealing flap 73 is installed in the secondary sealing groove 6, so that the contact surfaces of the two are in close contact. The annular part 741 and the annular spring 742 are assembled into the cavity seat 71, ensuring that the tapered end of the annular part 741 fits against the tapered groove 8 of the main sealing flap 72. The bearing cover 4 with the assembled sealing structure is fitted onto the outer surface of the needle roller bearing 3, completing the fixation of the bearing cover 4 and the needle roller bearing 3. Finally, the sealing plug 10 is unscrewed, and lubricating oil is injected into the oil reservoir 11 through the oil filling port 9. After filling, the sealing plug 10 is tightened to complete the assembly.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cardan shaft assembly structure with a plurality of sealed petal cavity assemblies, characterized by, The device includes a cross shaft body (1), with four ends of the cross shaft body (1) serving as journals (2). A needle roller bearing (3) is fitted onto the outer surface of each journal (2). A bearing cover (4) is provided on the outer surface of each needle roller bearing (3). A main sealing groove (5) and a secondary sealing groove (6) are provided on the inner end of the bearing cover (4). A sealing valve cavity assembly (7) is provided between the bearing cover (4) and the journal (2). The sealing valve cavity assembly (7) includes a cavity seat (71) and a main sealing... The main sealing flap (72) and the secondary sealing flap (73) are fixedly installed on the surface of the journal (2). The inner surface of the main sealing flap (72) is interference-fitted with the outer surface of the journal (2). One side of the main sealing flap (72) is tightly fitted with one side of the secondary sealing flap (73). The main sealing flap (72) is adapted to the main sealing groove (5). The secondary sealing flap (73) is adapted to the secondary sealing groove (6). The cavity seat (71) is provided with an elastic component (74).

2. The cross axle assembly structure with multiple sealed petal cavity assembly of claim 1, wherein: Both the main sealing flap (72) and the secondary sealing flap (73) are made of fluororubber.

3. The cross axle assembly structure with multiple sealed petal cavity assembly of claim 1, wherein: The elastic component (74) includes an annular member (741) that is slidably installed inside the cavity seat (71). One end of the annular member (741) is fixedly connected to an annular spring (742), and one end of the annular spring (742) is fixedly connected to the inner wall of the cavity seat (71).

4. The cross axle assembly structure with multiple sealed petal cavity assembly of claim 3, wherein: The other end of the annular component (741) is set as a conical end, and the other side of the main sealing flap (72) is provided with a conical groove (8) that is adapted to the conical end.

5. The cross axle assembly structure with multiple sealed petal cavity assembly of claim 1, wherein: The surface of the cross shaft body (1) is provided with an oil inlet (9), and the inner surface of the oil inlet (9) is threaded with a sealing plug (10). The interior of the cross shaft body (1) is provided with an oil storage cavity (11), which is connected to the oil inlet (9).

6. The cross shaft assembly structure with multiple sealing flap cavity components according to claim 5, characterized in that: The journal (2) has an oil outlet (12) on its surface. The oil outlet (12) is located inside the needle roller bearing (3). The oil outlet (12) is connected to the oil storage chamber (11) through the oil outlet pipe (13).

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