Maintenance-free intermediate supporting structure, intermediate transmission shaft assembly and vehicle

Abstract

The invention belongs to the technical field of vehicles, and discloses a maintenance-free intermediate supporting structure, an intermediate transmission shaft assembly and a vehicle, the maintenance-free intermediate supporting structure comprises an intermediate shaft, a bearing, a bracket, a flange and an oil seal assembly, the intermediate shaft is provided with a grease cavity, and the grease cavity serves as a storage space for filling and storing lubricating grease when leaving a factory; a first oil conveying hole formed in the intermediate shaft is communicated with the grease cavity, the intermediate shaft is fixedly sleeved with the bearing, a second oil conveying hole formed in the bearing is communicated with the first oil conveying hole, a sealing cavity is formed between the first oil seal and the second oil seal, and the bearing is located in the sealing cavity. Lubricating grease stored in the grease cavity of the intermediate shaft enters the bearing through the first oil conveying hole and the second oil conveying hole, so that it is guaranteed that the lubricating grease in the inner cavity of the bearing is supplemented in time, high durability of the intermediate supporting structure is guaranteed, the maintenance-free effect is achieved, meanwhile, the weight of the intermediate shaft is gradually reduced, and the light weight effect can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a maintenance-free intermediate support structure, an intermediate transmission shaft assembly and a vehicle. Background Art

[0002] The drive shaft assembly on commercial vehicles is mainly located between the transmission and the drive axle. During the driving process of the vehicle, the torque output by the engine located in the front of the vehicle through the transmission is transmitted to the drive axle located at the rear of the vehicle, and it has the function of compensating the transmission system angle and the change in the length of the transmission system caused by the bouncing of the drive axle when the vehicle is driving. When the wheelbase of the vehicle is long, in order to avoid the resonance problem caused by the critical speed being lower than the engine input speed due to the excessive length of a single drive shaft assembly, it is necessary to arrange the drive shaft system into two or more drive shaft assemblies. At this time, it is necessary to install an intermediate support on each intermediate drive shaft assembly to fix the drive shaft to the frame.

[0003] At present, the intermediate support assembly of the transmission shaft is mainly composed of bearings, intermediate shafts, rubber gaskets, gasket brackets and other fasteners from the inside to the outside. The inner ring of the bearing is connected to the intermediate shaft on the transmission shaft assembly body. When the vehicle is running, the outer ring of the bearing is fixed on the inner side of the rubber gasket and fixed to the frame together with the rubber gasket through the bracket. The bearing realizes the normal rotation of the transmission shaft and the fixed lifting function at the same time through the difference in the relative motion state of the inner and outer rings. An oil seal is generally set on the outside of the intermediate support bearing to form a sealed space for the bearing. The traditional intermediate support will be equipped with a grease nipple near the oil seal. The user needs to add grease to the inside of the oil seal through the grease nipple during regular vehicle maintenance, so that the intermediate support bearing remains lubricated during the service life. However, when the lubricating grease in the inner cavity of the bearing is partially lost or missing and is not discovered in time, it is easy to cause bearing ablation, resulting in reduced durability of the bearing. The user needs to maintain the intermediate support assembly in time, which greatly increases the maintenance time and cost.

[0004] Therefore, there is an urgent need for a maintenance-free intermediate support structure, an intermediate transmission shaft assembly and a vehicle to solve the above problems. Summary of the invention

[0005] According to one aspect of the present invention, the present invention provides a maintenance-free intermediate support structure, and the grease in the bearing cavity is automatically replenished in time to achieve a maintenance-free effect. At the same time, the grease in the grease cavity is continuously replenished into the bearing, which can play a lightweight role.

[0006] In order to solve the above problems existing in the prior art, the present invention adopts the following technical solutions:

[0007] Maintenance-free intermediate support structure, including:

[0008] An intermediate shaft, wherein the intermediate shaft has a grease cavity, and the intermediate shaft is provided with a first oil delivery hole, wherein the first oil delivery hole is connected to the grease cavity;

[0009] A bearing, wherein the bearing is fixedly sleeved on the intermediate shaft, and the bearing is provided with a second oil delivery hole, and the second oil delivery hole is connected to the first oil delivery hole;

[0010] A bracket, wherein the bracket is fixedly sleeved on the bearing;

[0011] A flange, wherein the flange is sleeved on the intermediate shaft, and along the axial direction of the intermediate shaft, the flange abuts against the end surface of the bearing;

[0012] An oil seal assembly, the oil seal assembly includes a first oil seal and a second oil seal, the inner ring of the first oil seal is connected to the intermediate shaft, the outer ring of the first oil seal is connected to the bracket, the inner ring of the second oil seal is connected to the flange, the outer ring of the second oil seal is connected to the bracket, a sealed cavity is formed between the first oil seal and the second oil seal, and the bearing is located in the sealed cavity.

[0013] Preferably, along the circumferential direction of the intermediate shaft, the outer circumferential surface of the intermediate shaft is provided with a first grease groove, the bottom of the first grease groove is provided with the first oil delivery hole, and the first grease groove is connected to the first oil delivery hole and the second oil delivery hole.

[0014] Preferably, along the circumferential direction of the bearing, the inner ring of the bearing is provided with a second grease groove, the second grease groove is arranged around the first grease groove, the bottom of the second grease groove is provided with the second oil delivery hole, and the second grease groove is connected to the first oil delivery hole and the second oil delivery hole.

[0015] Preferably, a central axis of the first oil delivery hole coincides with a central axis of the second oil delivery hole.

[0016] Preferably, there are multiple first oil delivery holes and multiple second oil delivery holes, and the multiple first oil delivery holes are arranged in a one-to-one correspondence with the multiple second oil delivery holes.

[0017] Preferably, the maintenance-free intermediate support structure further comprises a plugging cover, the intermediate shaft is provided with an opening, the plugging cover is arranged at the opening, the plugging cover is provided with a filling hole, and the filling hole is used to add grease to the grease chamber.

[0018] Preferably, the blocking cover is connected to the intermediate shaft by welding.

[0019] Preferably, the maintenance-free intermediate support structure further comprises a locking nut, and a threaded portion is protruding from the end of the intermediate shaft, and the threaded portion is threadedly connected to the locking nut.

[0020] According to another aspect of the present invention, the present invention also provides an intermediate transmission shaft assembly, including a transmission shaft, a universal joint and the above-mentioned maintenance-free intermediate support structure, wherein the maintenance-free intermediate support structure is installed at one end of the transmission shaft, and the universal joint is installed at the other end of the transmission shaft.

[0021] According to yet another aspect of the present invention, the present invention provides a vehicle, comprising a transmission, a drive axle and the above-mentioned intermediate transmission shaft assembly, wherein the intermediate transmission shaft assembly is arranged between the transmission and the drive axle.

[0022] The beneficial effects of the present invention are:

[0023] The maintenance intermediate support structure provided by the present invention has an intermediate shaft with a grease cavity, a first oil delivery hole is provided on the intermediate shaft, the first oil delivery hole is connected to the grease cavity, a bearing is fixedly sleeved on the intermediate shaft, a second oil delivery hole is provided on the bearing, the second oil delivery hole is connected to the first oil delivery hole, a bracket is fixedly sleeved on the bearing, a flange is sleeved on the intermediate shaft, and the flange abuts against the end face of the bearing along the axial direction of the intermediate shaft. The oil seal assembly includes a first oil seal and a second oil seal, the inner ring of the first oil seal is connected to the intermediate shaft, the outer ring of the first oil seal is connected to the bracket, the inner ring of the second oil seal is connected to the flange, the outer ring of the second oil seal is connected to the bracket, a sealing cavity is formed between the first oil seal and the second oil seal, and the bearing is located in the sealing cavity. During the assembly process of the intermediate transmission shaft assembly, a certain amount of lubricating grease is pre-filled in the grease cavity of the intermediate shaft to meet the consumption of the intermediate support structure during the entire life cycle. During the use of the intermediate transmission shaft assembly, when the internal cavity of the bearing is partially lost or missing, under the centrifugal force generated by the high-speed rotation of the transmission shaft, the grease stored in the grease cavity of the intermediate shaft enters the internal cavity of the bearing through the first oil delivery hole and the second oil delivery hole in the sealed cavity to ensure that the grease in the inner cavity of the bearing is automatically replenished in time, avoiding failures such as bearing ablation due to lack of grease, and ensuring the high durability of the intermediate support structure. At the same time, the user does not need to perform grease injection maintenance on the intermediate support structure, achieving a maintenance-free maintenance effect. The intermediate shaft is a hollow structure, which serves as a storage space for the reserve grease added when leaving the factory. At the same time, the grease in the grease cavity will be continuously replenished into the bearing, and the weight of the intermediate shaft will gradually decrease, which can play a lightweight role.

[0024] This embodiment also provides an intermediate transmission shaft assembly, including a transmission shaft, a universal joint, and a maintenance-free intermediate support structure, wherein the maintenance-free intermediate support structure is installed at one end of the transmission shaft, and the universal joint is installed at the other end of the transmission shaft. Before the intermediate transmission shaft assembly leaves the factory, a certain amount of lubricating grease is added to the grease cavity of the intermediate shaft in advance to meet the consumption of the intermediate support structure during its entire life cycle. When the bearing of the intermediate transmission shaft assembly partially loses or loses grease, under the centrifugal force generated by the high-speed rotation of the transmission shaft, the grease in the grease cavity enters the internal cavity of the bearing through the first oil delivery hole and the second oil delivery hole to ensure that the grease in the inner cavity of the bearing is automatically replenished in a timely manner, without the need for the user to perform grease injection maintenance, thereby achieving a maintenance-free maintenance effect.

[0025] The present embodiment also provides a vehicle, including a transmission, a drive axle, and an intermediate transmission shaft assembly, wherein the intermediate transmission shaft assembly is arranged between the transmission and the drive axle. During the driving process of the vehicle, when the lubricating grease of the bearing of the intermediate transmission shaft assembly is partially lost or missing, under the centrifugal force generated by the high-speed rotation of the transmission shaft, the lubricating grease in the grease cavity enters the internal cavity of the bearing through the first oil delivery hole and the second oil delivery hole, so as to ensure that the lubricating grease in the inner cavity of the bearing is automatically replenished in time, and the user does not need to perform grease injection maintenance on the intermediate support structure, so as to achieve the effect of maintenance-free maintenance, and the lubricating grease in the grease cavity will be continuously replenished into the bearing, which plays a role in lightweighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A partial cross-sectional view of an intermediate transmission shaft assembly provided by an embodiment of the present invention;

[0027] Figure 2 An exploded schematic diagram of an intermediate transmission shaft assembly provided by an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the structure of an intermediate shaft provided by an embodiment of the present invention;

[0029] Figure 4 A partial cross-sectional view of an intermediate shaft provided by an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of the structure of a bearing provided in an embodiment of the present invention;

[0031] Figure 6 A partial cross-sectional view of a bearing provided by an embodiment of the present invention;

[0032] Figure 7 A schematic structural diagram of a blocking cover provided in an embodiment of the present invention.

[0033] Reference numerals:

[0034] 100, transmission shaft; 200, universal joint;

[0035] 1. intermediate shaft; 11. grease chamber; 12. first oil delivery hole; 13. first grease groove; 14. opening; 15. threaded portion;

[0036] 2. bearing; 21. second oil delivery hole; 22. second grease groove;

[0037] 3. Bracket;

[0038] 4. Flange;

[0039] 51. First oil seal; 52. Second oil seal;

[0040] 6. Sealing cavity;

[0041] 7. Plug the cover; 71. Fill the hole;

[0042] 8. Lock nut. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0047] like Figure 1-Figure 7 As shown, in this embodiment, the maintenance-free intermediate support structure includes an intermediate shaft 1, a bearing 2, a bracket 3, a flange 4 and an oil seal assembly. The intermediate shaft 1 has a grease cavity 11, the intermediate shaft 1 is provided with a first oil delivery hole 12, the first oil delivery hole 12 is connected to the grease cavity 11, the bearing 2 is fixedly sleeved on the intermediate shaft 1, the bearing 2 is provided with a second oil delivery hole 21, the second oil delivery hole 21 is connected to the first oil delivery hole 12, the bracket 3 is fixedly sleeved on the bearing 2, the flange 4 is sleeved on the intermediate shaft 1, and along the axial direction of the intermediate shaft 1, the flange 4 abuts against the end face of the bearing 2. The oil seal assembly includes a first oil seal 51 and a second oil seal 52, the inner ring of the first oil seal 51 is connected to the intermediate shaft 1, the outer ring of the first oil seal 51 is connected to the bracket 3, the inner ring of the second oil seal 52 is connected to the flange 4, the outer ring of the second oil seal 52 is connected to the bracket 3, a sealing cavity 6 is formed between the first oil seal 51 and the second oil seal 52, and the bearing 2 is located in the sealing cavity 6.

[0048] Specifically, the bearing 2 is a ball bearing 2 structure, the bracket 3 is composed of a rubber gasket and a cast metal frame, the inner hole of the bracket 3 is interference fit with the bearing 2, the outer periphery of the bracket 3 is fixed to the frame through a hanging plate, the oil seal assembly is made of rubber material, the flange 4 is a metal forging and machining, and the flange 4 is matched with the transmission shaft 100 assembly through its own flange surface to achieve the function of transmitting torque. The intermediate shaft 1 is made of metal material machining forging, and the outer peripheral surface of the intermediate shaft 1 is a first matching shaft surface, a second matching shaft surface, a third matching shaft surface and an external spline from left to right. The first matching shaft surface is used to position and match with the inner peripheral wall of the transmission shaft 100 and weld and fix, the second matching shaft surface is interference fit with the lip of the first oil seal 51, the third matching shaft surface is interference fit with the inner ring of the bearing 2, the inner periphery of the flange 4 is provided with an internal spline, and the intermediate shaft 1 is connected with the internal spline of the flange 4 through the external spline provided on the outer peripheral surface. The bracket 3 is interference fit with the outer ring of the bearing 2, the second oil seal 52 is sleeved on the outer periphery of the flange 4 and is interference fit therewith, and the outer ring of the second oil seal 52 is interference fit with the bracket 3, the lip of the second oil seal 52 is used to seal the end face of the bearing 2, and the oil seal assembly, the bracket 3, the intermediate shaft 1 and the flange 4 are surrounded to form a sealing cavity 6, and the bearing 2 is located in the sealing cavity 6. The intermediate shaft 1 is a hollow structure, and the intermediate shaft 1 is provided with a grease cavity 11 along its own axis, and the grease cavity 11 is used to store lubricating grease, the third matching axial surface of the intermediate shaft 1 is provided with a first oil delivery hole 12, and the inner ring surface of the bearing 2 connected to the third matching axial surface is provided with a second oil delivery hole 21, one end of the second oil delivery hole 21 is connected to the grease cavity 11 through the first oil delivery hole 12, and the other end of the second oil delivery hole 21 is connected to the internal cavity of the bearing 2.

[0049] During the assembly of the intermediate transmission shaft assembly, a certain amount of lubricating grease is pre-filled into the grease chamber 11 of the intermediate shaft 1 to meet the consumption of the intermediate support structure during the entire life cycle. During the use of the intermediate transmission shaft assembly, when the lubricating grease in the internal cavity of the bearing 2 is partially lost or missing, under the centrifugal force generated by the high-speed rotation of the transmission shaft 100, the lubricating grease stored in the grease chamber 11 of the intermediate shaft 1 enters the internal cavity of the bearing 2 through the first oil delivery hole 12 and the second oil delivery hole 21 in the sealing cavity 6 to ensure that the lubricating grease in the inner cavity of the bearing 2 is automatically replenished in time, avoiding failures such as ablation of the bearing 2 due to lack of lubricating grease, and ensuring the high durability of the intermediate support structure. At the same time, the user does not need to perform grease injection maintenance on the intermediate support structure, achieving the effect of maintenance-free maintenance. The intermediate shaft 1 is a hollow structure, which serves as a storage space for the reserved lubricating grease when leaving the factory. At the same time, the lubricating grease in the grease chamber 11 will be continuously replenished into the bearing 2, and the weight of the intermediate shaft 1 is gradually reduced, which can play a lightweight role.

[0050] Further, continue to refer to Figure 1 , Figure 4 and Figure 6, along the circumferential direction of the intermediate shaft 1, a first grease groove 13 is provided on the outer circumferential surface of the intermediate shaft 1, a first oil delivery hole 12 is provided at the bottom of the first grease groove 13, and the first grease groove 13 is connected to the first oil delivery hole 12 and the second oil delivery hole 21. Along the circumferential direction of the bearing 2, a second grease groove 22 is provided on the inner ring of the bearing 2, the second grease groove 22 is arranged around the first grease groove 13, a second oil delivery hole 21 is provided at the bottom of the second grease groove 22, and the second grease groove 22 is connected to the first oil delivery hole 12 and the second oil delivery hole 21. Specifically, the first grease groove 13 and the second grease groove 22 are annular structures, the number of the first oil delivery holes 12 and the second oil delivery holes 21 is multiple, the multiple first oil delivery holes 12 and the multiple second oil delivery holes 21 are arranged one by one, the first grease groove 13 is provided with multiple uniformly distributed first oil delivery holes 12 along its circumferential direction, and the second grease groove 22 is provided with multiple uniformly distributed second oil delivery holes 21 along its circumferential direction. After the bearing 2 and the intermediate shaft 1 are assembled, the first grease groove 13 and the second grease groove 22 are arranged correspondingly to form a storage space for the transfer of lubricating grease, so as to avoid the situation that the first oil delivery hole 12 and the second oil delivery hole 21 are not aligned when the bearing 2 and the intermediate shaft 1 are assembled, or the bearing 2 and the intermediate shaft 1 move relative to each other during daily driving of the vehicle, resulting in the inability to transport lubricating grease. In addition, the storage space formed by the first grease groove 13 and the second grease groove 22 is a circumferential through structure to provide a space for the transfer of lubricating grease, ensuring that the first oil delivery hole 12 and the second oil delivery hole 21 can flow normally even when they do not correspond.

[0051] Further, refer to Figure 1 , the central axis of the first oil delivery hole 12 coincides with the central axis of the second oil delivery hole 21. Specifically, under the centrifugal force generated by the high-speed rotation of the transmission shaft 100, in the sealed cavity 6, the lubricating grease stored in the grease cavity 11 of the intermediate shaft 1 enters the internal cavity of the bearing 2 through the first oil delivery hole 12, the first grease groove 13, the second grease groove 22 and the second oil delivery hole 21 in sequence, so as to ensure that the lubricating grease in the inner cavity of the bearing 2 is automatically replenished in time, achieving the effect of maintenance-free maintenance. When the hole positions of the first oil delivery hole 12 and the second oil delivery hole 21 are aligned one by one, the circulation speed of the lubricating grease can be increased.

[0052] Further, refer to Figure 1 and Figure 7 The maintenance-free intermediate support structure further includes a plugging cover 7. The intermediate shaft 1 is provided with an opening 14. The plugging cover 7 is arranged at the opening 14. The plugging cover 7 is provided with a filling hole 71. The filling hole 71 is used to add grease to the grease cavity 11. Specifically, since the grease is not resistant to high temperatures, the plugging cover 7 is welded and fixed to the intermediate shaft 1 at the opening 14 to form a grease cavity 11 for storing grease. Before leaving the factory, a certain amount of grease is added to the grease cavity 11 through the filling hole 71 to meet the consumption of the intermediate support structure during the entire life cycle.

[0053] Further, refer to Figure 1-Figure 2 The maintenance-free intermediate support structure further includes a locking nut 8. A threaded portion 15 is convexly provided at the end of the intermediate shaft 1, and the threaded portion 15 is threadedly connected with the locking nut 8. Specifically, the locking nut 8 is fixed by threading with the threaded portion 15 of the intermediate shaft 1, and the locking nut 8 can be pressed against the end surface of the flange 4 to prevent the flange 4 and the intermediate shaft 1 from axial movement at the position of the spline connection, and the connection is stable.

[0054] This embodiment also provides an intermediate transmission shaft assembly, such as Figure 1-Figure 2 As shown, the intermediate transmission shaft assembly includes a transmission shaft 100, a universal joint 200 and a maintenance-free intermediate support structure, wherein the maintenance-free intermediate support structure is installed at one end of the transmission shaft 100, and the universal joint 200 is installed at the other end of the transmission shaft 100. Specifically, the outer peripheral surface of the intermediate shaft 1 is positioned and matched with the inner ring of one end of the transmission shaft 100 and fixed by welding, and the universal joint 200 is welded and assembled at the other end of the transmission shaft 100 to form the intermediate transmission shaft assembly. Before the intermediate transmission shaft assembly leaves the factory, a certain amount of lubricating grease is added to the grease chamber 11 of the intermediate shaft 1 in advance to meet the consumption of the intermediate support structure during the full life cycle. When the bearing 2 of the intermediate transmission shaft assembly has partial loss or loss of lubricating grease, under the centrifugal force generated by the high-speed rotation of the transmission shaft 100, the lubricating grease in the grease chamber 11 enters the internal cavity of the bearing 2 through the first oil delivery hole 12 and the second oil delivery hole 21, so as to ensure that the lubricating grease in the inner cavity of the bearing 2 is automatically replenished in time, without the need for the user to perform grease injection maintenance, thereby achieving the effect of maintenance-free maintenance.

[0055] The present embodiment also provides a vehicle, including a transmission, a drive axle and an intermediate transmission shaft assembly, wherein the intermediate transmission shaft assembly is arranged between the transmission and the drive axle. Specifically, during the driving process of the vehicle, the intermediate transmission shaft assembly transmits the torque output by the engine located in front of the vehicle through the transmission to the drive axle located at the rear of the vehicle, and has the function of compensating the transmission system angle and the change in the length of the transmission system caused by the bouncing of the drive axle when the vehicle is driving. An intermediate support structure is installed between adjacent intermediate transmission shaft assemblies to facilitate fixing the transmission shaft 100 on the vehicle frame. During the driving process of the vehicle, when the bearing 2 of the intermediate transmission shaft assembly partially loses or loses grease, under the centrifugal force generated by the high-speed rotation of the transmission shaft 100, the grease in the grease cavity 11 enters the internal cavity of the bearing 2 through the first oil delivery hole 12 and the second oil delivery hole 21, so as to ensure that the grease in the inner cavity of the bearing 2 is automatically replenished in time, without the need for the user to perform grease injection maintenance on the intermediate support structure, so as to achieve the effect of maintenance-free maintenance, and the grease in the grease cavity 11 will be continuously replenished into the bearing 2, which plays a role in lightweighting.

[0056] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Maintenance-free intermediate support structure, characterized in that: include: An intermediate shaft (1), the intermediate shaft (1) having a grease chamber (11), the intermediate shaft (1) being provided with a first oil delivery hole (12), the first oil delivery hole (12) being connected to the grease chamber (11); A bearing (2), wherein the bearing (2) is fixedly sleeved on the intermediate shaft (1), and the bearing (2) is provided with a second oil delivery hole (21), and the second oil delivery hole (21) is connected to the first oil delivery hole (12); A bracket (3), wherein the bracket (3) is fixedly sleeved on the bearing (2); A flange (4), wherein the flange (4) is sleeved on the intermediate shaft (1), and along the axial direction of the intermediate shaft (1), the flange (4) abuts against the end surface of the bearing (2); An oil seal assembly, the oil seal assembly comprising a first oil seal (51) and a second oil seal (52), the inner ring of the first oil seal (51) being connected to the intermediate shaft (1), the outer ring of the first oil seal (51) being connected to the bracket (3), the inner ring of the second oil seal (52) being connected to the flange (4), the outer ring of the second oil seal (52) being connected to the bracket (3), a sealing cavity (6) being formed between the first oil seal (51) and the second oil seal (52), and the bearing (2) being located in the sealing cavity (6).

2. The maintenance-free intermediate support structure according to claim 1, characterized in that: A first grease groove (13) is provided on the outer peripheral surface of the intermediate shaft (1) along the circumferential direction of the intermediate shaft (1), the first oil delivery hole (12) is provided at the bottom of the first grease groove (13), and the first grease groove (13) is connected to the first oil delivery hole (12) and the second oil delivery hole (21).

3. The maintenance-free intermediate support structure according to claim 2, characterized in that: A second grease groove (22) is provided on the inner ring of the bearing (2) along the circumferential direction of the bearing (2); the second grease groove (22) is arranged around the first grease groove (13); the second oil delivery hole (21) is provided at the bottom of the second grease groove (22); the second grease groove (22) is connected to the first oil delivery hole (12) and the second oil delivery hole (21).

4. The maintenance-free intermediate support structure according to claim 1, characterized in that: The central axis of the first oil delivery hole (12) coincides with the central axis of the second oil delivery hole (21).

5. The maintenance-free intermediate support structure according to claim 1, characterized in that: There are a plurality of the first oil delivery holes (12) and the second oil delivery holes (21), and the plurality of the first oil delivery holes (12) and the plurality of the second oil delivery holes (21) are arranged in a one-to-one correspondence.

6. The maintenance-free intermediate support structure according to claim 1, characterized in that: The maintenance-free intermediate support structure further comprises a plugging cover (7), the intermediate shaft (1) is provided with an opening (14), the plugging cover (7) is arranged at the opening (14), the plugging cover (7) is provided with a filling hole (71), and the filling hole (71) is used to add grease to the grease chamber (11).

7. The maintenance-free intermediate support structure according to claim 6, characterized in that: The blocking cover (7) is connected to the intermediate shaft (1) by welding.

8. The maintenance-free intermediate support structure according to claim 1, characterized in that: The maintenance-free intermediate support structure also includes a locking nut (8). A threaded portion (15) is protruding from the end of the intermediate shaft (1), and the threaded portion (15) is threadedly connected to the locking nut (8).

9. Intermediate transmission shaft assembly, characterized in that: It comprises a transmission shaft (100), a universal joint (200) and a maintenance-free intermediate support structure as described in any one of claims 1 to 8, wherein the maintenance-free intermediate support structure is installed at one end of the transmission shaft (100) and the universal joint (200) is installed at the other end of the transmission shaft (100).

10. A vehicle, characterized in that It comprises a transmission, a drive axle and the intermediate transmission shaft assembly as claimed in claim 9, wherein the intermediate transmission shaft assembly is arranged between the transmission and the drive axle.

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