Gear, power transmission device and vehicle

Abstract

The invention discloses a gear, a power transmission device and a vehicle, and belongs to the technical field of automobiles. Due to the fact that the gap which is formed by the first concave-convex structure and the second concave-convex structure and communicated in the circumferential direction is filled with the viscous fluid medium, when the gear shaft and the outer gear ring rotate relatively in the initial stage of power transmission, the first concave-convex structure and the second concave-convex structure on the end faces of the gear shaft and the outer gear ring can extrude the viscous fluid medium in the gap. Flexible transmission of power is achieved through the hydraulic action of fluid, and in the process, flow resistance of viscous fluid media can generate delayed response to torque change, so that instantaneous impact energy generated when a power source is started is effectively absorbed, and gear knocking noise is remarkably reduced. As power transmission tends to be stable, part of the gap between the gear shaft and the outer gear ring is gradually reduced till the first concave-convex structure and the second concave-convex structure form rigid contact, reliable power transmission under the high-torque working condition is ensured, and the problems of torque fluctuation and mechanical failure caused by deformation limit of a traditional elastic buffering piece are solved.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and particularly to a gear, a power transmission device, and a vehicle. Background Art

[0002] Gear transmission has become a core component of the automotive transmission system due to its advantages such as compact structure, high transmission efficiency, strong load-bearing capacity, and long service life, and is widely used in key assemblies such as engines.

[0003] In gear design, an appropriate backlash needs to be reserved between the inner hub and the outer tooth ring of the meshing gears to ensure the formation of a lubricating oil film between the tooth surfaces and prevent the teeth from jamming due to thermal expansion. However, this gap will cause gear knocking noise due to torque fluctuations during transmission, seriously affecting the noise, vibration, and harshness (NVH) performance of the transmission system. For this reason, the prior art usually adopts a shock-absorbing gear structure, that is, an elastic buffer (such as rubber or spring) is arranged between the inner hub and the outer tooth ring.

[0004] However, although such a structure can reduce the knocking noise to a certain extent, due to the limited deformation ability of the elastic buffer, when the torque to be transmitted is large, the elastic buffer is always in the deformation limit state, and the elastic buffer is extremely easy to be damaged, and the transmitted torque is not stable enough to cope with the operating conditions at high torque, and it is difficult to meet the reliability requirements of gear transmission. Summary of the Invention

[0005] The embodiments of this application provide a gear, a power transmission device, and a vehicle, which can meet the operating conditions at high torque while alleviating the knocking noise. The technical solutions are as follows:

[0006] On the one hand, a gear is provided, including:

[0007] A gear shaft, an outer tooth ring, two bearings, and two limit baffles;

[0008] The gear shaft is coaxially arranged with the outer tooth ring. The end face of the gear shaft facing the outer tooth ring has a first concave-convex structure, and the end face of the outer tooth ring facing the gear shaft has a second concave-convex structure; a circumferentially connected gap is formed between the first concave-convex structure and the second concave-convex structure, and the gap is filled with a viscous fluid medium;

[0009] The two bearings are coaxially installed on the gear shaft and are located on the axial two sides of the first concave-convex structure respectively. The two limit baffles are coaxially installed on the outer tooth ring and are located on the axial two sides of the second concave-convex structure respectively, and the outer tooth ring is in rolling contact with the balls on the bearings through the limit baffles;

[0010] Among them, after the gear shaft is subjected to a driving force, the first concave-convex structure and the second concave-convex structure achieve buffering by squeezing the viscous fluid medium in the gap.

[0011] Optionally, the viscous fluid medium is lubricating oil, hydraulic oil, synthetic oil, silicone oil or bio-based oil.

[0012] Optionally, when the viscous fluid medium is lubricating oil, the viscosity range of the lubricating oil is: VG150 to VG 460.

[0013] Optionally, the radial end face of the gear shaft has a first mating surface, and the radial end face of the external gear ring has a second mating surface. The first mating surface and the second mating surface are opposite and spaced apart;

[0014] A plurality of first protrusions in the first concave-convex structure are equally spaced along the circumferential direction of the first mating surface, and a plurality of second protrusions in the second concave-convex structure are equally spaced along the circumferential direction of the second mating surface, and the plurality of first protrusions and the plurality of second protrusions are staggered in the circumferential direction;

[0015] Among them, a gap is formed between any adjacent first protrusion and second protrusion, and the plurality of gaps communicate with each other in the circumferential direction.

[0016] Optionally, the limit baffle is a middle-hollow annular structure. Each limit baffle has an inner annular surface and an outer annular surface coaxially arranged with the gear shaft. The diameter of the inner annular surface is smaller than the outer diameter of the outer annular surface;

[0017] The limit baffle is fixedly connected to the axial end of the external gear ring near the outer annular surface. The inner annular surface extends to the ball on the bearing and is in rolling contact with the ball.

[0018] Optionally, the gear further includes: a plurality of fasteners, and the plurality of fasteners are evenly distributed along the circumferential direction of the limit baffle;

[0019] Among them, the limit baffle and the external gear ring are fixedly connected by a plurality of fasteners.

[0020] Optionally, the bearing includes: an annular member, a cage and a plurality of the balls; the annular member is fixedly connected to the axial end of the gear shaft, the cage is arranged between the annular member and the limit baffle, and the cage has a plurality of openings corresponding to the plurality of balls one by one;

[0021] Among them, the balls are partially embedded in the openings, and the outer surfaces of the balls are in rolling contact with the limit baffle and the annular member respectively.

[0022] Optionally, the gear shaft includes: a gear shaft body, and annular protrusions connected to both axial sides of the gear shaft body;

[0023] Wherein, the annular sleeve is sleeved on the annular protrusion and is connected to the annular protrusion by interference fit.

[0024] On the other hand, a power transmission device is provided, including:

[0025] An engine and / or a gearbox, wherein a gear as described in any one of the above is provided on the crankshaft of the engine and / or the driven shaft of the gearbox.

[0026] On yet another hand, a vehicle is provided, including:

[0027] A vehicle body, and a power transmission device installed in the vehicle body, the power transmission device being the power transmission device described above.

[0028] The beneficial effects brought by the technical solutions provided in the embodiments of the present application at least include:

[0029] Due to the circumferentially connected gap formed by the first concave-convex structure and the second concave-convex structure between the gear shaft and the external gear ring, a viscous fluid medium is filled therein. Therefore, when the gear shaft and the external gear ring rotate relative to each other at the initial stage of power transmission, the first concave-convex structure and the second concave-convex structure on their end faces will squeeze the viscous fluid medium in the gap, and the flexible transmission of power is realized through the fluid hydraulic action. In this process, the flow resistance of the viscous fluid medium will produce a delayed response to the torque change, thereby effectively absorbing the instantaneous impact energy when the power source starts or the load changes suddenly, and significantly reducing the gear knocking noise. As the power transmission tends to be stable, some of the gaps between the gear shaft and the external gear ring gradually decrease until the first concave-convex structure and the second concave-convex structure form a rigid contact, ensuring the reliable transmission of power under high-torque conditions and avoiding the torque fluctuation and mechanical failure problems caused by the deformation limit of traditional elastic buffer parts. If torque fluctuation occurs again in the transmission system, the relative displacement between the gear shaft and the external gear ring causes the gap to re-form and be filled with the viscous fluid medium, and the instantaneous buffer torque impact energy is achieved through the dynamic compression characteristics of the fluid, avoiding the vibration caused by rigid impact. In addition, the rolling contact design of the bearing and the limit baffle restricts the axial displacement of the external gear ring and reduces the friction loss, further suppressing the vibration transmission path, thereby significantly extending the service life of the gear. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 is a schematic structural diagram of a gear provided by an embodiment of the present application;

[0032] Figure 2 is a schematic structural diagram of a gear shaft and an external gear ring provided by an embodiment of the present application;

[0033] Figure 3 is Figure 2 a schematic structural diagram of a gear shaft and an external gear ring shown from another perspective;

[0034] Figure 4 is a schematic structural diagram of a gear shaft and a bearing provided by an embodiment of the present application;

[0035] Figure 5 is a cross-sectional view of a gear provided by an embodiment of the present application;

[0036] Figure 6 is a schematic structural diagram of a gear shaft provided by an embodiment of the present application;

[0037] Figure 7 is Figure 2 another schematic structural diagram of a gear shaft and an external gear ring shown from another perspective;

[0038] Figure 8 is a schematic structural diagram of a limit baffle provided by an embodiment of the present application;

[0039] Figure 9 is Figure 1 an exploded view of the gear shown;

[0040] Figure 10 is a schematic structural diagram of a bearing provided by an embodiment of the present application;

[0041] Figure 11 is another schematic structural diagram of a gear shaft provided by an embodiment of the present application;

[0042] Figure 12 is another schematic structural diagram of a gear shaft and an external gear ring provided by an embodiment of the present application. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0044] In the embodiments of the present application, orientation nouns such as "upper", "lower", "side", etc. are generally based on the orientation shown in the figures, and the use of these orientation nouns is only to more clearly describe the relationship between structures and structures, rather than to describe an absolute orientation.

[0045] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meaning as commonly understood by those of ordinary skill in the art.

[0046] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0047] Please refer to Figures 1 to 5 , Figure 1 which is a schematic structural diagram of a gear provided by an embodiment of the present application. Figure 2 which is a schematic structural diagram of a gear shaft and an outer gear ring provided by an embodiment of the present application. Figure 3 is Figure 2 a schematic structural diagram of the gear shaft and the outer gear ring shown from another perspective. Figure 4 which is a schematic structural diagram of a gear shaft and a bearing provided by an embodiment of the present application. Figure 5 which is a cross-sectional view of a gear provided by an embodiment of the present application. The gear 000 may include: a gear shaft 100, an outer gear ring 200, two bearings 300, and two limit baffles 400.

[0048] The gear shaft 100 in the gear 000 may be coaxially arranged with the outer gear ring 200. In the radial direction of the gear 000, the end face of the gear shaft 100 facing the outer gear ring 200 has a first concave-convex structure 101, and the end face of the outer gear ring 200 facing the gear shaft 100 has a second concave-convex structure 201. Among them, a circumferentially communicating gap A may be formed between the first concave-convex structure 101 and the second concave-convex structure 201, and a viscous fluid medium is filled in the gap A.

[0049] The two bearings 300 in the gear 000 are respectively coaxially installed on the gear shaft 100 and are located on both axial sides of the first concave-convex structure 101. The two limit baffles 400 in the gear 000 are respectively coaxially installed on the outer gear ring 200 and are located on both axial sides of the second concave-convex structure 201, and the outer gear ring 200 can be in rolling contact with the balls 303 on the bearing 300 through the limit baffle 400.

[0050] Among them, after the gear shaft 100 is subjected to a driving force, the first concave-convex structure 101 and the second concave-convex structure 201 can achieve buffering by squeezing the viscous fluid medium in the gap A.

[0051] In the embodiment of the present application, due to the circumferentially communicating gap A formed by the first concave-convex structure 101 and the second concave-convex structure 201 between the gear shaft 100 and the external gear ring 200, a viscous fluid medium is filled therein. Therefore, when the gear shaft 100 and the external gear ring 200 rotate relative to each other at the initial stage of power transmission, the first concave-convex structure 101 and the second concave-convex structure 201 on their end faces will squeeze the viscous fluid medium in the gap A, and the flexible transmission of power is realized through the fluid hydraulic action. In this process, the flow resistance of the viscous fluid medium will produce a delayed response to the torque change, thereby effectively absorbing the instantaneous impact energy when the power source starts or the load suddenly changes, and significantly reducing the knocking noise of the gear 000. As the power transmission tends to be stable, part of the gap A between the gear shaft 100 and the external gear ring 200 gradually decreases until the first concave-convex structure 101 and the second concave-convex structure 201 form a rigid contact, ensuring reliable power transmission under high-torque conditions and avoiding the torque fluctuation and mechanical failure problems caused by the deformation limit of traditional elastic buffer components. If torque fluctuation occurs again in the transmission system, the relative displacement between the gear shaft 100 and the external gear ring 200 causes the gap A to be re-formed and filled with the viscous fluid medium, and the instantaneous buffer torque impact energy is achieved through the dynamic compression characteristics of the fluid, avoiding vibration caused by rigid impact. In addition, the rolling contact design of the bearing 300 and the limit baffle 400 further suppresses the vibration transmission path by restricting the axial displacement of the external gear ring 200 and reducing the friction loss, thereby significantly extending the service life of the gear 000.

[0052] In summary, the embodiment of the present application provides a gear, including: a gear shaft, an external gear ring, two bearings and two limit baffles. Due to the circumferentially communicating gap formed by the first concave-convex structure and the second concave-convex structure between the gear shaft and the external gear ring, a viscous fluid medium is filled therein. Therefore, when the gear shaft and the external gear ring rotate relative to each other at the initial stage of power transmission, the first concave-convex structure and the second concave-convex structure on their end faces will squeeze the viscous fluid medium in the gap, and the flexible transmission of power is realized through the fluid hydraulic action. In this process, the flow resistance of the viscous fluid medium will produce a delayed response to the torque change, thereby effectively absorbing the instantaneous impact energy when the power source starts or the load suddenly changes, and significantly reducing the knocking noise of the gear. As the power transmission tends to be stable, part of the gap between the gear shaft and the external gear ring gradually decreases until the first concave-convex structure and the second concave-convex structure form a rigid contact, ensuring reliable power transmission under high-torque conditions and avoiding the torque fluctuation and mechanical failure problems caused by the deformation limit of traditional elastic buffer components. If torque fluctuation occurs again in the transmission system, the relative displacement between the gear shaft and the external gear ring causes the gap to be re-formed and filled with the viscous fluid medium, and the instantaneous buffer torque impact energy is achieved through the dynamic compression characteristics of the fluid, avoiding vibration caused by rigid impact. In addition, the rolling contact design of the bearing and the limit baffle further suppresses the vibration transmission path by restricting the axial displacement of the external gear ring and reducing the friction loss, thereby significantly extending the service life of the gear.

[0053] In some embodiments, to ensure the stability and adaptability of the viscous fluid medium under different working conditions, the viscous fluid medium can be selected from lubricating oil, hydraulic oil, synthetic oil, silicone oil, or bio-based oil. Due to their excellent viscosity characteristics, shear resistance, and temperature stability, these materials are very suitable for buffering and power transmission between the gear shaft 100 and the external gear ring 200.

[0054] In addition, the embodiments of the present application are not limited to the above specific materials. Any material that can provide the required viscosity, fluidity, and compressive properties is suitable for manufacturing the filling medium within the gap A. For example, a high-viscosity polymer solution or a nanofluid with a specific formulation can also be used as an alternative to meet the requirements of different application scenarios.

[0055] Optionally, when the viscous fluid medium is lubricating oil, the viscosity range of the lubricating oil is: VG 150 to VG460.

[0056] For example, the viscosity of the lubricating oil can be VG 220, VG 320, or VG 460, etc. Of course, the viscosity of the lubricating oil can also be other values, as long as its viscosity is within the range of VG 150 to VG 460 and can provide sufficient flow resistance and buffering effect.

[0057] In the embodiments of the present application, please refer to Figure 6 and Figure 7 , Figure 6 which is a schematic structural diagram of a gear shaft provided by the embodiments of the present application, Figure 7 is Figure 2 Another schematic structural diagram of a gear shaft and an external gear ring shown from another perspective. The radial end face of the gear shaft 100 in the gear 000 can have a first mating surface S1, and the radial end face of the external gear ring 200 in the gear 000 can have a second mating surface S2, and the first mating surface S1 and the second mating surface S2 are opposite and spaced apart.

[0058] A plurality of first protrusions 1011 in the first concave-convex structure 101 can be evenly distributed along the circumferential direction of the first mating surface S1, and a plurality of second protrusions 2011 in the second concave-convex structure 201 can be evenly distributed along the circumferential direction of the second mating surface S2, and the plurality of first protrusions 1011 can be staggered with the plurality of second protrusions 2011 in the circumferential direction.

[0059] Wherein, a gap A can be formed between any adjacent first protrusion 1011 and second protrusion 2011, and the plurality of gaps A can communicate with each other in the circumferential direction.

[0060] In this case, through the design of staggered protrusions with equal spacing, the first protrusion 1011 of the gear shaft 100 and the second protrusion 2011 of the outer gear ring 200 alternately compress the viscous fluid medium in the gap A during relative rotation, so that the fluid medium can flow evenly along the circumference and dynamically distribute pressure, thereby avoiding local pressure concentration and significantly improving the uniformity of the buffering effect. At the same time, the staggered protrusions continuously squeeze the fluid medium to generate stable fluid shear force and compression resistance, effectively absorbing high-frequency impact energy during gear meshing, reducing stress concentration, further reducing noise and vibration, and improving the noise, vibration and acoustic roughness performance of the gear system.

[0061] In some embodiments, Figure 12 As shown, each first protrusion 1011 may include: a first base segment 10111 and a first extension segment 10112 connected to each other, the first base segment 10111 is connected to the first mating surface S1, and the first extension segment 10112 is located on the side of the first base segment 10111 away from the gear shaft 100; each second protrusion 2011 may include: a second base segment 20111 and a second extension segment 20112 connected to each other, the second base segment 20111 is connected to the second mating surface S2, and the second extension segment 20112 is located on the side of the second base segment 20111 away from the outer gear ring 200.

[0062] Among them, as the power transmission tends to be stable, the partial gap A between the gear shaft 100 and the outer gear ring 200 gradually decreases until one side of the corresponding first base segment 10111 forms a rigid contact with one side of the second extension segment 20112, thereby realizing reliable power transmission under high torque conditions.

[0063] Optional, please refer to Figure 1 , Figure 5 , Figure 8 and Figure 9 , Figure 8 is a schematic diagram of the structure of a limit baffle provided in an embodiment of the present application, Figure 9 yes Figure 1 The limit baffle 400 in the gear 000 may be a hollow annular structure, and each limit baffle 400 may have an inner annular surface U1 and an outer annular surface U2 coaxially arranged with the gear shaft 100, and the diameter of the inner annular surface U1 is smaller than the outer diameter of the outer annular surface U2.

[0064] The limit baffle 400 in the gear 000 is fixedly connected to the axial end of the outer gear ring 200 near the outer annular surface U2, and the inner annular surface U1 in the limit baffle 400 can extend to the ball 303 on the bearing 300 and roll in contact with the ball 303. For example, the ball 303 can be a steel ball made of metal material.

[0065] In this case, the design in which the inner annular surface U1 extends to the ball 303 and makes rolling contact with the ball 303 enables the outer gear ring 200 to evenly transfer the force to the bearing 300 through the limit baffle 400 when axially stressed, avoiding local stress concentration. At the same time, the rolling characteristics of the ball 303 further reduce the frictional resistance of the contact surface, improving the running smoothness and efficiency of the gear 000 system. In addition, the outer annular surface U2 of the limit baffle 400 is fixedly connected to the axial end of the outer gear ring 200, ensuring the structural stability of the outer gear ring 200 during high-speed rotation and preventing deformation or displacement caused by centrifugal force, thereby enhancing the reliability and service life of the gear 000 system.

[0066] Optionally, please refer to Figure 1 、 Figure 5 and Figure 9 For, the gear 000 may further include: a plurality of fasteners 500, and the plurality of fasteners 500 may be evenly distributed along the circumferential direction of the limit baffle 400. Exemplarily, the number of the plurality of fasteners 500 is 6, and the 6 fasteners 500 may be evenly distributed along the circumferential direction of the limit baffle 400.

[0067] Among them, the limit baffle 400 and the outer gear ring 200 in the gear 000 may be tightly connected by a plurality of fasteners 500.

[0068] It should be noted that the fastener 500 may be a bolt with an external thread, and the limit baffle 400 and the outer gear ring 200 may have internal threaded holes corresponding to the fastener 500 one by one, and the limit baffle 400 and the outer gear ring 200 are tightly fixed through threaded connection. This design not only enhances the connection strength between the limit baffle 400 and the outer gear ring 200, but also further improves the structural stability and anti-vibration ability of the gear 000 system, thereby extending the service life of the gear 000 and enhancing its reliability under high-load conditions.

[0069] In the embodiment of the present application, please refer to Figure 10 , Figure 10 is a schematic structural diagram of a bearing provided by an embodiment of the present application. The bearing 300 in the gear 000 may include: an annular member 301, a cage 302, and a plurality of balls 303. The annular member 301 in the bearing 300 may be fixedly connected to the axial end of the gear shaft 100, the cage 302 in the bearing 300 may be disposed between the annular member 301 and the limit baffle 400, and the cage 302 has a plurality of openings M corresponding to the plurality of balls 303 one by one.

[0070] Among them, part of the balls 303 in the bearing 300 are embedded in the openings M, and the outer surfaces of the balls 303 are in rolling contact with the limit baffle 400 and the annular member 301 respectively.

[0071] In this case, the ball 303 is partially embedded in the opening M of the cage 302 and is in rolling contact with the limit baffle 400 and the annular member 301 through its outer surface respectively. This design effectively reduces the frictional loss between the gear shaft 100 and the external gear ring 200, and reduces the vibration and noise during the operation of the gear 000. At the same time, the setting of the cage 302 ensures the uniform distribution and stable movement of the balls 303, avoiding local wear or jamming of the balls 303 caused by uneven force, thereby extending the service life of the bearing 300. In addition, the annular member 301 is fixedly connected to the axial end of the gear shaft 100, further enhancing the structural stability of the bearing 300, enabling it to withstand complex stresses under high-load conditions, and ensuring the reliability and efficiency of the gear 000 system during high-torque transmission.

[0072] Optionally, please refer to Figure 11 , Figure 11 FIG. Figure 11 is another structural schematic diagram of a gear shaft provided by an embodiment of the present application. The gear shaft 100 in the gear 000 may include: a gear shaft body 102, and annular protrusions 103 connected to both axial sides of the gear shaft body 102.

[0073] Wherein, the annular member 301 in the bearing 300 is sleeved on the annular protrusion 103 and is connected with the annular protrusion 103 by an interference fit.

[0074] Exemplarily, the gear shaft body 102, the annular protrusion 103, and the first concave-convex structure 101 may be an integrally formed structure.

[0075] It should be noted that there are two bearings 300, limit baffles 400, and annular protrusions 103 in the present application, and they are respectively distributed on both axial sides of the gear 000.

[0076] In this case, the annular member 301 in the bearing 300 is sleeved on the annular protrusion 103 and is connected by an interference fit. This design ensures the tight fixation between the bearing 300 and the gear shaft 100, preventing the bearing 300 from loosening or displacing under high-speed rotation or high-load conditions, thereby enhancing the structural stability of the gear 000 system. At the same time, the interference fit connection effectively reduces the gap between the bearing 300 and the gear shaft 100, reduces the vibration transmission and noise generation, and further improves the noise, vibration, and harshness performance of the gear 000 system. In addition, the design of the annular protrusion 103 provides precise installation positioning for the bearing 300, ensuring more uniform and stable rolling contact between the balls 303 and the limit baffle 400, reducing local wear and energy loss, and extending the service life of the gear 000 system.

[0077] In summary, the embodiment of the present application provides a gear, including: a gear shaft, an outer gear ring, two bearings and two limit baffles. Due to the circumferentially communicating gap formed by the first concave-convex structure and the second concave-convex structure between the gear shaft and the outer gear ring, a viscous fluid medium is filled therein. Therefore, when the gear shaft and the outer gear ring rotate relative to each other at the initial stage of power transmission, the first concave-convex structure and the second concave-convex structure on their end faces will squeeze the viscous fluid medium in the gap, and realize the flexible transmission of power through the fluid hydraulic action. In this process, the flow resistance of the viscous fluid medium will produce a delayed response to the torque change, thereby effectively absorbing the instantaneous impact energy when the power source starts or the load suddenly changes, and significantly reducing the gear knocking noise. As the power transmission tends to be stable, some of the gaps between the gear shaft and the outer gear ring gradually decrease until the first concave-convex structure and the second concave-convex structure form a rigid contact, ensuring the reliable transmission of power under high-torque conditions and avoiding the torque fluctuation and mechanical failure problems caused by the deformation limit of traditional elastic buffer parts. If torque fluctuation occurs again in the transmission system, the relative displacement between the gear shaft and the outer gear ring causes the gap to form again and be filled with the viscous fluid medium, and the instantaneous buffer torque impact energy is achieved through the dynamic compression characteristics of the fluid, avoiding the vibration caused by rigid impact. In addition, the rolling contact design of the bearing and the limit baffle further suppresses the vibration transmission path by restricting the axial displacement of the outer gear ring and reducing the friction loss, thereby significantly extending the service life of the gear.

[0078] The embodiment of the present application also provides a power transmission device, which may include an engine and / or a gearbox. Among them, the crankshaft in the engine and / or the driven shaft in the gearbox are provided with the gear 000 as described in any one of the above.

[0079] The embodiment of the present application also provides a vehicle, which may be a hybrid vehicle, a pure fuel vehicle or an extended-range electric vehicle, etc. The vehicle may include: a vehicle body, and a power transmission device installed in the vehicle body, wherein the power transmission device is the above-mentioned power transmission device.

[0080] In the present application, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.

[0081] Those skilled in the art will readily think of other implementation schemes of the present application after considering the specification and practicing the invention disclosed herein. The present application aims to cover any variations, uses or adaptive changes of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and the embodiments are only regarded as exemplary.

[0082] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

[0083] The above is only for the convenience of those skilled in the art to understand the technical solution of the present application, and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A gear, characterized in that: include: A gear shaft (100), an outer gear ring (200), two bearings (300) and two limit baffles (400); The gear shaft (100) is coaxially arranged with the outer gear ring (200); the end surface of the gear shaft (100) facing the outer gear ring (200) has a first concave-convex structure (101); the end surface of the outer gear ring (200) facing the gear shaft (100) has a second concave-convex structure (201); a circumferentially connected gap (A) is formed between the first concave-convex structure (101) and the second concave-convex structure (201), and the gap (A) is filled with a viscous fluid medium; The two bearings (300) are respectively coaxially mounted on the gear shaft (100) and located on both axial sides of the first concave-convex structure (101); the two limit baffles (400) are respectively coaxially mounted on the outer gear ring (200) and located on both axial sides of the second concave-convex structure (201); and the outer gear ring (200) is in rolling contact with the balls (303) on the bearings (300) through the limit baffles (400); Wherein, after the gear shaft (100) is subjected to a driving force, the first concave-convex structure (101) and the second concave-convex structure (201) achieve buffering by squeezing the viscous fluid medium in the gap (A).

2. The gear according to claim 1, characterized in that: The viscous fluid medium is lubricating oil, hydraulic oil, synthetic oil, silicone oil or bio-based oil.

3. The gear according to claim 2, characterized in that: When the viscous fluid medium is lubricating oil, the viscosity of the lubricating oil ranges from VG 150 to VG 460.

4. The gear according to claim 1, characterized in that: The radial end surface of the gear shaft (100) has a first mating surface (S1), and the radial end surface of the outer gear ring (200) has a second mating surface (S2), and the first mating surface (S1) and the second mating surface (S2) are opposite to each other and are arranged at an interval; The plurality of first protrusions (1011) in the first concave-convex structure (101) are distributed at equal intervals along the circumference of the first matching surface (S1), the plurality of second protrusions (2011) in the second concave-convex structure (201) are distributed at equal intervals along the circumference of the second matching surface (S2), and the plurality of first protrusions (1011) and the plurality of second protrusions (2011) are alternately arranged in the circumferential direction; Wherein, a gap (A) is formed between any adjacent first protrusion (1011) and second protrusion (2011), and a plurality of the gaps (A) are interconnected in the circumferential direction.

5. The gear according to any one of claims 1 to 4, characterized in that: The position limiting baffle (400) is a hollow annular structure, and each of the position limiting baffles (400) has an inner annular surface (U1) and an outer annular surface (U2) coaxially arranged with the gear shaft (100), and the diameter of the inner annular surface (U1) is smaller than the outer diameter of the outer annular surface (U2); The limit baffle (400) is fixedly connected to the axial end of the outer gear ring (200) near the outer annular surface (U2), and the inner annular surface (U1) extends to the ball (303) on the bearing (300) and is in rolling contact with the ball (303).

6. The gear according to claim 5, characterized in that The gear further comprises: a plurality of fasteners (500), wherein the plurality of fasteners (500) are evenly distributed along the circumference of the limit baffle (400); Wherein, the limit baffle (400) and the outer gear ring (200) are fastened and connected via the plurality of fasteners (500).

7. The gear according to any one of claims 1 to 4, characterized in that: The bearing (300) comprises: an annular member (301), a retaining frame (302) and a plurality of balls (303); the annular member (301) is fixedly connected to the axial end of the gear shaft (100); the retaining frame (302) is arranged between the annular member (301) and the limit baffle (400); and the retaining frame (302) has a plurality of openings (M) corresponding one-to-one to the plurality of balls (303); The ball (303) is partially embedded in the opening (M), and the outer surface of the ball (303) is in rolling contact with the limit baffle (400) and the annular member (301) respectively.

8. The gear according to claim 7, characterized in that The gear shaft (100) comprises: a gear shaft body (102), and an annular protrusion (103) connected to both axial sides of the gear shaft body (102); Wherein, the annular member (301) is sleeved on the annular protrusion (103) and is connected to the annular protrusion (103) by interference fit.

9. A power transmission device, characterized in that: It comprises an engine and / or a gearbox, wherein the crankshaft of the engine and / or the driven shaft of the gearbox is provided with a gear as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: include: A vehicle body, and a power transmission device installed in the vehicle body, wherein the power transmission device is the power transmission device according to claim 9.

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