Intermediate supporting seat assembly, transmission shaft assembly and transmission system

Abstract

The invention relates to an intermediate supporting seat assembly, a transmission shaft assembly and a transmission system. The intermediate supporting seat assembly comprises a supporting seat shell, a transmission shaft and a transmission shaft, the supporting shaft penetrates through the supporting seat shell and is rotatably connected with the supporting seat shell through a bearing, the supporting shaft can move relative to the supporting seat shell in the axial direction, and the bearing moves along with the supporting shaft in the axial direction; the damping mechanism is arranged between the supporting shaft and the supporting seat shell and used for providing damping force when the supporting shaft moves relative to the supporting seat shell in the axial direction. According to the middle supporting seat, the supporting shaft can move relative to the supporting seat shell in the axial direction, when the supporting shaft is subjected to axial force, the supporting shaft moves relative to the supporting seat shell in the axial direction, the bearing moves along with the supporting shaft, impact force is prevented from directly acting on the bearing, the influence of axial impact force on the bearing is reduced, and the failure rate of the middle supporting seat is reduced; in the moving process of the supporting shaft, the damping mechanism generates damping force to dissipate impact energy, and the damping mechanism can play a role in vibration reduction so as to reduce vibration in the running process of the supporting seat assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile transmission systems, and in particular to an intermediate support seat assembly, a transmission shaft assembly and a transmission system. Background Art

[0002] The transmission of power from the gearbox to the rear axle in the automobile transmission system is generally achieved by a transmission system consisting of a front drive shaft, an intermediate support seat, and a rear drive shaft. Among them, the intermediate support seat serves as a connecting piece between the front drive shaft and the rear drive shaft. It is connected to the vehicle body to support the drive shaft assembly.

[0003] The intermediate support seat assembly generally includes a support seat housing, a bearing and a support shaft. The bearing is arranged in the support seat housing. The support shaft passes through the bearing and is rotatably connected to the support seat through the bearing. The support seat is connected to the vehicle body, and the support shaft is connected to the front and rear drive shafts to transmit power.

[0004] When the vehicle turns, the drive shaft assembly will generate an axial impact force on the support shaft during the process of transmitting torque. This axial impact will accelerate the wear of the bearing rollers and lead to a high incidence of intermediate support seat failures. Summary of the invention

[0005] Based on the above description, the present invention provides an intermediate support seat assembly, a drive shaft assembly and a transmission system to solve the problem in the related technology that when the whole vehicle turns, the drive shaft assembly will generate an axial impact force on the support shaft during the process of transmitting torque, and this axial impact will accelerate the wear of the bearing rollers, resulting in a high incidence of intermediate support failures.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] In the first aspect, the present application provides an intermediate support seat assembly, and the technical solution adopted is as follows:

[0008] An intermediate support seat assembly comprises:

[0009] Support housing;

[0010] A support shaft, which passes through the support seat housing and is rotatably connected to the support seat housing through a bearing, the support shaft can move axially relative to the support seat housing, and the bearing moves axially with the support shaft;

[0011] The damping mechanism is arranged between the support shaft and the support seat housing, and is used for providing a damping force when the support shaft moves axially relative to the support seat housing.

[0012] Preferably, the damping mechanism comprises:

[0013] Two fixing rings, the fixing rings are arranged in the support seat housing and are coaxially sleeved outside the support shaft, the two fixing rings are spaced apart along the axial direction of the support shaft, the fixing rings are fixedly connected to the support seat housing and form a seal, a seal is formed between the fixing rings and the support shaft, a sealing chamber is formed between the two fixing rings, and the sealing chamber is filled with a damping medium;

[0014] A piston ring is arranged in the support seat housing and coaxially sleeved outside the support shaft. The piston ring and the support shaft can rotate relative to each other, and the piston ring and the support shaft are restricted by a limiting structure from moving relative to each other in the axial direction. The piston ring is located between the two fixed rings and divides the sealed chamber into two sub-chambers located on both sides of the piston ring. The two sub-chambers are connected through a plurality of throttling holes opened on the piston ring.

[0015] Preferably, the connection structure includes a limiting groove provided on the side wall of the supporting shaft, the limiting groove is coaxially opened around the supporting shaft, the piston ring is embedded in the limiting groove and both end surfaces are in contact with the side wall of the limiting groove.

[0016] Preferably, the bearing is a tapered roller bearing.

[0017] Preferably, the bearing outer ring is connected to the support housing via a spline connection, so that the bearing outer ring can move axially relative to the support housing and limit relative rotation between the bearing outer ring and the support housing.

[0018] Preferably, both ends of the support seat shell are axially connected, and end covers are respectively provided at both ends of the support seat shell, the end covers surround the outside of the support shaft and are sealed with the support seat shell, and an oil seal is provided between the end cover and the support shaft.

[0019] Preferably, dustproof components are respectively provided between the two ends of the support seat shell and the support shaft, the dustproof components include a fixed dust cover and a movable dust cover, the fixed dust cover and the movable dust cover both surround the outside of the support shaft, the fixed dust cover is fixed to the end cover, the fixed dust cover includes a dust cover tube extending axially along the support shaft, the dust cover tube is arranged around the oil seal, one end of the dust cover tube is sealingly connected to the end cover, the movable dust cover is fixed and sealingly connected to the support shaft, and the dust cover tube extends away from one end of the end cover into the movable dust cover.

[0020] In a second aspect, the present application provides a transmission shaft assembly, comprising:

[0021] The intermediate support assembly as described in the first aspect above;

[0022] Two universal couplings, one universal coupling connects the intermediate support seat assembly and the gearbox, and the other universal coupling connects the intermediate support seat assembly and the rear axle.

[0023] In a third aspect, the present application provides a transmission system, comprising the transmission shaft assembly as described in the second aspect above.

[0024] Compared with the prior art, the technical solution of the present application has at least the following beneficial technical effects:

[0025] 1. The intermediate support seat assembly of the present application is configured such that the support shaft can move axially relative to the support seat housing. When the support shaft is subjected to an axial force, the support shaft can move axially relative to the support seat housing, and the bearing moves with the support shaft, thereby avoiding the impact force from directly acting on the bearing, reducing the impact of the axial impact force on the bearing, and reducing the failure rate of the intermediate support seat. During the movement of the support shaft, the damping mechanism generates a damping force to dissipate the impact energy, and the damping mechanism can play a role in vibration reduction, so as to reduce the vibration of the support seat assembly during operation.

[0026] 2. In the intermediate support seat assembly of the present application, the damping mechanism is formed by two fixed rings and a piston ring. The two fixed rings cooperate to form a sealed chamber between the support shaft and the support seat housing. By filling the sealed chamber with damping medium and arranging a piston ring connected to the support shaft in the sealed chamber, the support shaft drives the piston ring to move in the sealed chamber when it moves axially. Due to the setting of the throttle hole on the piston ring, the sub-chambers on both sides of the piston ring axially are connected through the throttle hole. The damping medium can flow between the sub-chambers on both sides of the piston ring through the throttle hole. When the piston ring moves, the damping medium is squeezed to flow from one side of the sub-chamber to the other side. When the damping medium passes through the throttle hole, a damping force is generated to provide a damping force for the axial movement of the support shaft. Due to the setting of the limiting structure, the piston ring moves axially with the support shaft and does not rotate with the support shaft, ensuring that the damping mechanism works and avoiding the rotational resistance of the piston ring to the support shaft, thereby reducing the loss during power transmission.

[0027] 3. The transmission shaft assembly of the present application is connected to the gearbox and the intermediate support seat assembly and the rear axle and the intermediate support seat assembly respectively through two universal couplings. When the transmission shaft assembly transmits torque, the axial impact force generated on the support shaft of the intermediate support seat assembly can be offset by the expansion and contraction of the two universal couplings, thereby reducing the magnitude of the axial impact force generated on the support shaft, so as to reduce the impact of the axial impact force on the intermediate support seat assembly. In addition, the movement of the engine and gearbox of the whole vehicle can be offset by the rotation and expansion and contraction of the universal coupling between the gearbox and the intermediate support seat assembly, and the movement of the rear axle is offset by the rotation and expansion and contraction of the universal coupling between the rear axle and the intermediate support seat assembly. The up and down movement of the entire transmission system can be offset by the vibration reduction structure connecting the intermediate support seat assembly and the vehicle body, thereby effectively reducing the vibration of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic structural diagram of an intermediate support seat assembly provided in an embodiment of the present invention;

[0029] Figure 2 A schematic structural diagram of a transmission shaft assembly provided in an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1. Support seat housing; 2. Support shaft; 21. Limiting groove; 3. Bearing; 4. End cover; 5. Oil seal; 6. Flange; 7. Retaining ring; 8. Piston ring; 9. Sealing chamber; 10. Fixed dust cover; 11. Movable dust cover; 12. Universal coupling. DETAILED DESCRIPTION

[0032] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0034] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0035] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0036] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0037] Reference Figure 1 As shown, an embodiment of the present application provides an intermediate support seat assembly, which includes a support seat housing 1, a support shaft 2, a bearing 3 and a damping mechanism.

[0038] Reference Figure 1 As shown, a cylindrical cavity is formed in the support seat shell 1, and the support shaft 2 coaxially passes through the support seat shell 1. The support shaft 2 is rotatably connected to the support seat shell 1 through the bearing 3, and the support shaft 2 is configured to be movable axially relative to the support seat shell 1, and the bearing 3 moves axially with the support shaft 2; the damping mechanism is arranged between the support shaft 2 and the support seat shell 1, and is used to provide a damping force when the support shaft 2 moves axially relative to the support seat shell 1.

[0039] Specifically, the inner ring of the bearing 3 and the supporting shaft 2 are interference fit, and the outer ring of the bearing 3 and the inner wall of the supporting seat housing 1 are connected by splines. Specifically, the splines that match each other can be fixed on the outer ring of the bearing 3 and the inner wall of the supporting seat housing 1, so that the bearing 3 can move relative to the supporting seat housing 1 in the axial direction through the splines, and the outer ring of the bearing 3 and the supporting seat housing 1 are restricted from rotating relative to each other. The supporting shaft 2 can move relative to the supporting seat housing 1 in the axial direction, and the rotatable connection between the supporting shaft 2 and the supporting seat housing 1 and the support of the supporting shaft 2 are achieved through the bearing 3.

[0040] Reference Figure 1 As shown, in this embodiment, the bearing 3 is a tapered roller bearing 3, which has higher strength in the axial direction and is less affected by the axial impact force on the supporting shaft 2.

[0041] Reference Figure 1As shown, the bearing seat housing 1 is configured to have two ends in the axial direction penetrated, and end covers 4 are respectively provided at both ends of the bearing seat housing 1, the end covers 4 surround the outside of the supporting shaft 2, the end covers 4 and the bearing seat housing 1 are sealed and connected, and an oil seal 5 is provided between the end covers 4 and the supporting shaft 2. Specifically, flanges matching the end covers 4 are formed at both ends of the bearing seat housing 1, the end covers 4 and the bearing seat housing 1 are fixed by bolts, and the end covers 4 and the supporting shaft 2 are sealed by the oil seal 5. Thus, a sealed environment is formed in the bearing seat housing 1 to protect the bearing 3.

[0042] Reference Figure 1 As shown, further, two bearings 3 are provided, and the two bearings 3 are spaced apart along the axial direction of the supporting shaft 2, and the two bearings 3 are located between the two end covers 4. When the bearings 3 move with the supporting shaft 2, they can abut against the end cover 4 that is closer, so as to limit the axial movement distance of the supporting shaft 2 through the abutment of the two end covers 4 and the two bearings 3.

[0043] Reference Figure 1 As shown, further, in order to facilitate the connection between the support shaft 2 and the front and rear transmission shafts, flange flanges 6 are respectively provided at both ends of the support shaft 2, and the flange portion of the flange flange 6 surrounds the outside of the support shaft 2 and is fixed to the support shaft 2, and the flange portion extends through the oil seal 5 to abut against the end face of the inner ring of the bearing 3, that is, the oil seal 5 is arranged between the end cover 4 and the flange portion of the flange flange 6. In addition, the portion of the support shaft 2 between the two bearings 3 is thickened to form a step abutting against the end face of the outer ring of the bearing 3, so that the bearing 3 is limited to move relative to the support shaft 2 in the axial direction through the cooperation of the step on the support shaft 2 and the flange portion of the flange flange 6. A spline is arranged on the flange end face of the flange flange 6 so as to cooperate and connect with the spline on the transmission shaft.

[0044] Reference Figure 1 As shown, the damping mechanism includes two fixed rings 7 and a piston ring 8. The fixed ring 7 is arranged in the support seat housing 1 and is coaxially sleeved outside the support shaft 2. The two fixed rings 7 are spaced apart along the axial direction of the support shaft 2. The fixed ring 7 is fixedly connected to the support seat housing 1 and forms a seal. A seal is formed between the fixed ring 7 and the support shaft 2. A sealed chamber 9 is formed between the two fixed rings 7, and the sealed chamber 9 is filled with a damping medium. The piston ring 8 is arranged in the support seat housing 1 and is coaxially sleeved outside the support shaft 2. The piston ring 8 and the support shaft 2 can rotate relative to each other, and the piston ring 8 and the support shaft 2 are limited by a limiting structure to move relative to each other in the axial direction. The piston ring 8 is located between the two fixed rings 7, and the sealed chamber 9 is divided into two sub-chambers located on both sides of the piston ring 8. The two sub-chambers are connected through multiple throttling holes opened on the piston ring 8.

[0045] With this arrangement, when the supporting shaft 2 moves axially, the piston ring 8 is driven to move in the sealed chamber 9. Due to the arrangement of the throttle hole on the piston ring 8, the sub-chambers on both sides of the piston ring 8 in the axial direction are connected through the throttle hole, and the damping medium can flow between the sub-chambers on both sides of the piston ring 8 through the throttle hole. When the piston ring 8 moves, the damping medium is squeezed to flow from one sub-chamber to the other sub-chamber. When the damping medium passes through the throttle hole, a damping force is generated, providing a damping force for the axial movement of the supporting shaft 2. Due to the arrangement of the limiting structure, the piston ring 8 moves axially with the supporting shaft 2 and does not rotate with the supporting shaft 2, ensuring that the damping mechanism works and avoiding the rotational resistance of the piston ring 8 to the supporting shaft 2, thereby reducing the loss during power transmission. In the design, multiple throttle holes are evenly distributed on the end face of the fixing ring 7 to generate a uniform damping force.

[0046] Reference Figure 1 As shown, the limiting structure includes a limiting groove 21 provided on the side wall of the supporting shaft 2, the limiting groove 21 is coaxially opened around the supporting shaft 2, the piston ring 8 is embedded in the limiting groove 21 and the two end surfaces are in contact with the side wall of the limiting groove 21. Specifically, the limiting groove 21 is opened around the supporting shaft 2 in the circumferential direction, the piston ring 8 is embedded in the limiting groove 21 and the inner side surface is in contact with the supporting shaft 2, so that the supporting shaft 2 and the piston ring 8 can rotate relative to each other but cannot move axially and radially.

[0047] Reference Figure 1 As shown, further, in order to prevent external foreign matter from entering the support seat shell 1 during the operation of the vehicle and affecting the normal operation of the support seat assembly, dustproof components are respectively provided between the two ends of the support seat shell 1 and the support shaft 2, and the dustproof components include a fixed dust cover 10 and a movable dust cover 11. The fixed dust cover 10 and the movable dust cover 11 are both surrounded by the outside of the support shaft 2, the fixed dust cover 10 is fixed to the end cover 4, the fixed dust cover 10 includes a dust cover tube extending axially along the support shaft 2, the dust cover tube is arranged around the oil seal 5, one end of the dust cover tube is sealed and connected to the end cover 4, the movable dust cover 11 is fixed and sealed to the support shaft 2, and the dust cover tube extends away from one end of the end cover 4 to the movable dust cover 11.

[0048] Reference Figure 1 As shown, specifically, the fixed dust cover 10 includes a flange portion, which is arranged around the oil seal 5 and fits the end cover 4. The bolts connecting the end cover 4 and the support seat housing 1 simultaneously fix the flange portion, and the dust cover tube is formed by extending the inner side of the flange portion away from the end cover 4 along the axial direction of the support shaft 2. The movable dust cover 11 surrounds the flange portion of the flange flange 6 and is fixed to the flange portion. The movable dust cover 11 is arranged outside the dust cover tube of the fixed dust cover 10, and the movable dust cover 11 can move relative to the fixed dust cover 10, so that the movable dust cover 11 can move with the support shaft 2 and maintain a state of matching with the fixed dust cover 10 to play a dustproof role.

[0049] Reference Figure 2 As shown, this embodiment also provides a transmission shaft assembly, including the intermediate support seat assembly as described above and two universal couplings 12, wherein one universal coupling 12 connects the intermediate support seat assembly with the gearbox, and the other universal coupling 12 connects the intermediate support seat assembly with the rear axle.

[0050] Through this arrangement, when the transmission shaft assembly transmits torque, the axial impact force generated on the support shaft 2 of the intermediate support seat assembly can be offset by the expansion and contraction of the two universal couplings 12, thereby reducing the magnitude of the axial impact force generated on the support shaft 2, so as to reduce the influence of the axial impact force on the intermediate support seat assembly. In addition, the movement of the engine and gearbox of the whole vehicle can be offset by the rotation and expansion of the universal coupling between the gearbox and the intermediate support seat assembly, the movement of the rear axle is offset by the rotation and expansion of the universal coupling between the rear axle and the intermediate support seat assembly, and the up and down movement of the entire transmission system can be offset by the vibration reduction structure connecting the intermediate support seat assembly and the vehicle body, thereby effectively reducing the vibration of the whole vehicle.

[0051] This embodiment also provides a transmission system, including the transmission shaft assembly described above.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An intermediate support assembly, characterized in that: include: Support housing (1); A support shaft (2) passes through the support seat housing (1) and is rotatably connected to the support seat housing (1) via a bearing (3); the support shaft (2) can move axially relative to the support seat housing (1), and the bearing (3) moves axially along with the support shaft (2); A damping mechanism is provided between the support shaft (2) and the support seat housing (1) and is used for providing a damping force when the support shaft (2) moves axially relative to the support seat housing (1).

2. The intermediate support assembly according to claim 1, characterized in that: The damping mechanism comprises: Two fixing rings (7), the fixing rings (7) being arranged in the support seat housing (1) and being coaxially sleeved outside the support shaft (2), the two fixing rings (7) being spaced apart along the axial direction of the support shaft (2), the fixing rings (7) being fixedly connected to the support seat housing (1) and forming a seal, the fixing rings (7) and the support shaft (2) forming a seal, a sealing chamber (9) being formed between the two fixing rings (7), and the sealing chamber (9) being filled with a damping medium; A piston ring (8) is arranged in the support seat housing (1) and is coaxially sleeved outside the support shaft (2). The piston ring (8) and the support shaft (2) can rotate relative to each other, and the piston ring (8) and the support shaft (2) are restricted from relative movement in the axial direction by a limiting structure. The piston ring (8) is located between the two fixing rings (7) and divides the sealing chamber (9) into two sub-chambers located on both sides of the piston ring (8). The two sub-chambers are connected through a plurality of throttling holes opened on the piston ring (8).

3. The intermediate support assembly according to claim 2, characterized in that: The connection structure comprises a limiting groove (21) provided on the side wall of the supporting shaft (2), the limiting groove (21) being coaxially opened around the supporting shaft (2), the piston ring (8) being embedded in the limiting groove (21) and having both end surfaces in contact with the side wall of the limiting groove (21).

4. The intermediate support assembly according to claim 1, characterized in that: The bearing (3) is a tapered roller bearing (3).

5. The intermediate support assembly according to claim 1, characterized in that: The outer ring of the bearing (3) and the support seat housing (1) are connected via a spline, so that the outer ring of the bearing (3) can move axially relative to the support seat housing (1) and restrict the outer ring of the bearing (3) and the support seat housing (1) from rotating relative to each other.

6. The intermediate support assembly according to claim 1, characterized in that: The two axial ends of the support seat shell (1) are connected, and end covers (4) are respectively provided at the two ends of the support seat shell (1). The end covers (4) surround the outside of the support shaft (2) and are sealed with the support seat shell (1), and an oil seal (5) is provided between the end cover (4) and the support shaft (2).

7. The intermediate support assembly according to claim 6, characterized in that: Dustproof components are respectively provided between the two ends of the support seat shell (1) and the support shaft (2), and the dustproof components include a fixed dust cover (10) and a movable dust cover (11). The fixed dust cover (10) and the movable dust cover (11) are both surrounded by the outside of the support shaft (2). The fixed dust cover (10) is fixed to the end cover (4). The fixed dust cover (10) includes a dust cover tube extending along the axial direction of the support shaft (2). The dust cover tube is arranged around the oil seal (5). One end of the dust cover tube is sealed and connected to the end cover (4). The movable dust cover (11) is fixed and sealed and connected to the support shaft (2). The dust cover tube extends away from one end of the end cover (4) into the movable dust cover (11).

8. A transmission shaft assembly, characterized in that: include: The intermediate support assembly according to any one of claims 1 to 7; Two universal couplings (12), one of the universal couplings (12) connects the intermediate support seat assembly and the gearbox, and the other universal coupling (12) connects the intermediate support seat assembly and the rear axle.

9. A transmission system, characterized in that: Comprising a transmission shaft assembly as described in claim 7.

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