Double-row different-diameter hub system and mounting method

Abstract

The invention relates to the technical field of hub bearings, in particular to a double-row different-diameter hub system and a mounting method. The double-row reducing hub system comprises a bearing assembly and a shaft assembly. The bearing assembly comprises an outer ring unit, a rolling unit, a first inner ring module and a second inner ring module. The partial rolling unit is arranged between the outer ring unit and the first inner ring module; and the other part of rolling units are arranged between the outer ring unit and the second inner ring module. The inner diameter of the first inner ring module is smaller than that of the second inner ring module. The shaft assembly is arranged in the first inner ring module and the second inner ring module in a penetrating mode. The rolling state of the double-row different-diameter hub system includes that the first inner ring module and the second inner ring module rotate relative to the outer ring unit, at least part of the rolling units abut against the outer ring unit and the first inner ring module at the same time, and at least part of the rolling units abut against the outer ring unit and the second inner ring module at the same time. Therefore, the problem that the double-row different-diameter hub system is easy to damage in a stress state exceeding a design threshold for a long time is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hub bearing, in particular to a double-row different-diameter hub system and a mounting method. BACKGROUND

[0002] The automobile hub is a core load-bearing and power transmission component of the vehicle driving system, and its performance directly determines the driving safety, handling stability and whole life reliability of the vehicle. In the existing automobile hub system, the mainstream structure adopts a double-row symmetrical angular contact ball bearing or a double-row tapered roller bearing design, and the core components include an integrated inner ring, symmetrically arranged raceways, uniformly specified rolling units and an axle assembly. The inner ring is of an integral structure, the inner diameter size, the groove curvature radius and the rolling unit type of the two rows of raceways are completely consistent, and the axle assembly and the inner ring adopt a single fitting form (such as a transition fit commonly used for passenger cars and an interference fit commonly used for commercial vehicles). The core function of this design is to bear the static radial load of the vehicle body, transmit the torque input by the drive shaft, and maintain the rotation accuracy and stability of the vehicle wheel under dynamic conditions such as turning, high-speed cruising and driving on bumpy roads through the constraint action of the rolling unit.

[0003] However, during actual vehicle driving, the hub needs to simultaneously bear two types of loads: one is the static radial load caused by the weight of the vehicle body, and the other is the dynamic composite load such as the axial torque load during starting and acceleration or deceleration, the lateral load during turning and lane changing, and the impact load on bumpy roads. These loads are directly transmitted to the bearing system through the hub shell, making the fitting interface between the bearing inner ring and the axle assembly and the contact area between the raceway and the rolling unit become the key parts with high stress concentration. Since the existing system adopts a double-row symmetrical structure, the load bearing capacity of the two rows of raceways is completely consistent, and it is impossible to realize adaptive load distribution according to the working condition difference. For example, the lateral load is concentrated on the single-sided raceway during turning, and the radial load is excessively superimposed on the two rows of raceways during heavy load, which causes the stress concentration area to be in a stress state exceeding the design threshold for a long time, easily causing raceway pitting, inner ring fitting surface wear, rolling unit fatigue spalling and other faults, which not only shortens the service life of the hub system, but also directly threatens the driving safety of the vehicle. SUMMARY

[0004] To solve the problem that the stress concentration area of the double-row different-diameter hub system is easily damaged when it is in a stress state exceeding the design threshold for a long time, the present application provides a double-row different-diameter hub system and a mounting method.

[0005] In a first aspect, the present application provides a double-row different-diameter hub system, comprising:

[0006] A bearing assembly includes an outer ring unit, a rolling unit, and an inner ring unit; the inner ring unit includes a first inner ring module and a second inner ring module; the outer ring unit is respectively sleeved on the outer circumferential side of the first inner ring module and the second inner ring module; part of the rolling unit is arranged between the outer ring unit and the first inner ring module; another part of the rolling unit is arranged between the outer ring unit and the second inner ring module; the inner diameter of the first inner ring module is smaller than the inner diameter of the second inner ring module.

[0007] A shaft assembly is respectively arranged in the center hole of the first inner ring module and the center hole of the second inner ring module.

[0008] The rolling state of the double-row different-diameter hub system includes: the first inner ring module and the second inner ring module rotate relative to the outer ring unit, and at least part of the rolling unit simultaneously abuts against the outer ring unit and the first inner ring module, and at least part of the rolling unit simultaneously abuts against the outer ring unit and the second inner ring module; wherein the maximum gap between the shaft assembly and the first inner ring module is greater than the maximum gap between the shaft assembly and the second inner ring module; or, the interference amount between the shaft assembly and the first inner ring module is less than the interference amount between the shaft assembly and the second inner ring module.

[0009] In some embodiments, one end of the first inner ring module abuts against one end of the second inner ring module.

[0010] In some embodiments, the shaft assembly includes a first shaft, a second shaft, a third shaft, and a connecting shaft; the first shaft, the second shaft, the third shaft, and the connecting shaft are coaxially connected in sequence; the outer diameter of the first shaft is smaller than the outer diameter of the third shaft; the outer circumferential surface of the second shaft is arranged in a spaced manner with the inner circumferential wall of the first inner ring module and the inner circumferential wall of the second inner ring module; the outer circumferential wall of the first shaft abuts against the inner circumferential wall of the first inner ring module; and the outer circumferential wall of the third shaft abuts against the inner circumferential wall of the second inner ring module.

[0011] In some embodiments, the projection of the second shaft on the circular arc surface of the inner circumferential wall of the second inner ring module is arranged in a spaced manner with the inner circumferential wall of the second inner ring module.

[0012] In some embodiments, the outer ring unit includes an outer extension ring, a flange ring, a first outer ring, and a second outer ring; the outer extension ring, the flange ring, the first outer ring, and the second outer ring are coaxially connected in sequence.

[0013] The first outer ring and the first inner ring module are correspondingly arranged; part of the rolling units are arranged between the first outer ring and the first inner ring module; the second outer ring and the second inner ring module are correspondingly arranged; another part of the rolling units are arranged between the second outer ring and the second inner ring module.

[0014] In some embodiments, the outer diameter of the raceway on the second inner ring module is greater than the outer diameter of the raceway on the first inner ring module.

[0015] In some embodiments, the inner diameter of the outer extension ring is greater than the outer diameter of the first inner ring module.

[0016] In some embodiments, the rolling unit comprises a first rolling module and a second rolling module; the first rolling module comprises a first retainer and a first rolling body; the second rolling module comprises a second retainer and a second rolling body.

[0017] The first retainer is arranged between the first outer ring and the first inner ring module; a plurality of first rolling bodies are in rolling connection with the first retainer; the first rolling bodies respectively abut the inner peripheral wall of the first outer ring and the outer peripheral wall of the first inner ring module.

[0018] The second retainer is arranged between the second outer ring and the second inner ring module; a plurality of second rolling bodies are in rolling connection with the second retainer; the second rolling bodies respectively abut the inner peripheral wall of the second outer ring and the outer peripheral wall of the second inner ring module.

[0019] The outer diameter of the second retainer is greater than the outer diameter of the first retainer.

[0020] In a second aspect, the application provides a mounting method of a double-row different-diameter hub system, the mounting method of the double-row different-diameter hub system being applied to any one of the double-row different-diameter hub systems in the first aspect, and the mounting method of the double-row different-diameter hub system comprising:

[0021] Part of the rolling units abut the first specified area of the inner peripheral wall of the outer ring unit;

[0022] The first inner ring module abuts the rolling units of the first specified area;

[0023] Another part of the rolling units abut the second specified area of the outer ring unit;

[0024] The second inner ring module abuts the rolling units of the second specified area.

[0025] In some embodiments, the rolling unit comprises a first rolling module and a second rolling module; the first rolling module comprises a first rolling body and a first retainer; the second rolling module comprises a second rolling body and a second retainer; the outer ring unit comprises an outer extension ring, a first outer ring, and a second outer ring; the inner diameter of the second outer ring is greater than the inner diameter of the first inner ring module; a first specified area is on the inner side wall of the first outer ring; and a second specified area is on the inner side wall of the second outer ring.

[0026] The abutment of the other part of the rolling unit and the second specified area of the outer ring unit comprises:

[0027] Based on the abutment of the first inner ring module and the rolling unit of the first specified area, the second retainer is passed through the inner hole of the second outer ring, and the second retainer is placed on the inner side wall of the second outer ring.

[0028] A plurality of second rolling bodies are installed in the pockets of the second retainer, and the plurality of second rolling bodies abut the second specified area of the second outer ring.

[0029] To solve the problem that the stress concentration area of the double-row different-diameter hub system is prone to damage when it is in a stress state that exceeds the design threshold for a long time, the present application has the following advantages:

[0030] The differential design of the second inner ring module with a larger inner diameter than the first inner ring module provides more radial installation space for the shaft assembly in the core load-bearing area of stress concentration, allowing the shaft assembly in this area to be thickened specifically, directly improving the structural strength of the key parts, effectively resisting deformation and fatigue damage under high load, and breaking through the technical bottleneck of local reinforcement of the shaft assembly limited by the existing equal-diameter inner ring.

[0031] The cooperation design of the shaft assembly and the second inner ring module with a larger interference or a smaller gap can guide the main load to the second inner ring and the shaft assembly cooperation section with better structural strength, avoid stress peaks at geometric discontinuous parts, and significantly reduce the risk of bearing raceway spalling, cooperation surface wear and relaxation, shaft shoulder cracking, and other failures.

[0032] At the same time, while optimizing stress distribution, the radial positioning stability of the hub system is ensured through the synergistic effect of the double-row rolling unit, which not only solves the defect that the existing uniform load design cannot match the stress distribution, but also meets the durability demand under high load working conditions of vehicles, ultimately prolongs the service life of the hub system, and improves the driving safety of vehicles. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The structure diagram of a double-row different-diameter hub system for an embodiment;

[0034] Figure 2 isFigure 1 Structure diagram of the intermediate bearing assembly and the shaft assembly;

[0035] Figure 3 For Figure 2 Sectional view of the intermediate bearing assembly and the shaft assembly;

[0036] Figure 4 For Figure 3 Sectional view of the intermediate outer ring unit;

[0037] Figure 5 For Figure 3 Structure diagram of the intermediate rolling unit;

[0038] Figure 6 For Figure 3 Structure diagram of the intermediate inner ring unit;

[0039] Figure 7 For Figure 6 Sectional view of the intermediate inner ring unit;

[0040] Figure 8 For Figure 2 Structure diagram of the intermediate shaft assembly;

[0041] Figure 9 Flow chart of the installation method of the double-row step hub system for an embodiment;

[0042] Figure 10 Flow chart of the installation method of the double-row step hub system for another embodiment.

[0043] Reference signs:

[0044] 10, bearing assembly; 11, outer ring unit; 111, outer extension ring; 112, flange ring; 113, first outer ring ring; 114, second outer ring ring; 12, rolling unit; 121, first rolling module; 1211, first rolling body; 1212, first retainer; 122, second rolling module; 1221, second rolling body; 1222, second retainer; 13, inner ring unit; 131, first inner ring module; 1311, first abutting ring; 1312, first extension ring; 132, second inner ring module; 1321, second abutting ring; 1322, second extension ring; 20, shaft assembly; 21, connecting shaft; 22, first shaft; 23, second shaft; 24, third shaft; 30, wheel. DETAILED DESCRIPTION

[0045] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be appreciated that these embodiments are discussed only for the purposes of enabling those with ordinary skill in the art to better understand and thus practice the present disclosure, and are not intended to limit the scope of the present disclosure in any way.

[0046] As used herein, the term "includes" and its variants are to be read as open-ended terms that mean "including, but not limited to." The term "based on" is to be construed as "based at least in part on." The terms "one embodiment" and "an embodiment" are to be read as "at least one embodiment." The term "another embodiment" is to be read as "at least one other embodiment." The terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," "longitudinal," and similar terms are used for orientation or position relationships based on the orientation or position relationships shown in the drawings. These terms are primarily used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. In addition, in addition to indicating orientation or position relationships, some of the above terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to the specific circumstances. In addition, the terms "mounting", "setting", "provided with", "connected", "connected" should be understood broadly. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are primarily used to distinguish different devices, elements or components (the specific types and structures can be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0047] During vehicle driving, the hub needs to synchronously bear two types of loads, one is the static radial load brought by the body weight, and the other is the dynamic compound load such as the axial torque load during starting acceleration / braking deceleration, the lateral load during steering and lane changing, and the impact load of the bumpy road, etc. These loads are directly transmitted to the bearing system through the hub shell, so that the matching interface of the bearing inner ring and the shaft assembly 20, and the contact area of the raceway and the rolling unit 12 become the key parts with high stress concentration. Since the existing system adopts a double-row symmetrical structure, the load bearing capacity of the two rows of raceways is completely consistent, and it is impossible to realize adaptive load distribution according to the working condition difference, for example, the lateral load is concentrated on the single-side raceway during steering, and the radial load is excessively superimposed on the two rows of raceways during heavy load, which causes the stress concentration area to be in a stress state exceeding the design threshold for a long time, easily causing raceway pitting, inner ring matching surface wear, rolling unit 12 fatigue spalling and other faults, which not only shortens the service life of the hub system, but also directly threatens the driving safety of the vehicle.

[0048] Example 1:

[0049] This application proposes a dual-row differential diameter hub system, such as Figure 2 As shown, it includes a bearing assembly 10 and a shaft assembly 20. Figure 3 As shown, the bearing assembly 10 includes an outer ring unit 11, a rolling unit 12, and an inner ring unit 13. Figure 6 As shown, the inner ring unit 13 includes a first inner ring module 131 and a second inner ring module 132. The inner diameter of the first inner ring module 131 is smaller than the inner diameter of the second inner ring module 132. The outer ring unit 11 is respectively fitted onto the outer periphery of the first inner ring module 131 and the second inner ring module 132. When the dual-row differential diameter wheel hub system is configured on the driven wheel, the axle assembly 20 is fixed to the vehicle chassis and serves as a fixed reference. The outer ring unit 11 rotates with the wheel hub and cooperates in constraining the rolling unit 12. When the dual-row differential diameter wheel hub system is configured on the drive wheel, the outer ring unit 11 is fixed to the vehicle chassis and serves as a fixed reference to constrain the rolling unit 12, preventing the rolling unit 12 from shifting.

[0050] Some rolling units 12 are disposed between the outer ring unit 11 and the first inner ring module 131; other rolling units 12 are disposed between the outer ring unit 11 and the second inner ring module 132. The rolling units 12 convert the sliding friction between the outer ring and the inner ring into rolling friction, which greatly reduces rotational resistance and reduces local material fatigue caused by frictional heat generation.

[0051] The shaft assembly 20 is respectively installed in the center holes of the first inner ring module 131 and the second inner ring module 132. The smaller inner diameter of the first inner ring module 131 corresponds to the thinner diameter section of the shaft assembly 20, providing inner ring support for the secondary major load area of ​​the shaft. The larger inner diameter of the second inner ring module 132 can provide more radial installation space for the shaft assembly 20 in the core load-bearing area where stress is concentrated, allowing the shaft assembly 20 in this area to be thickened in a targeted manner, directly improving the structural strength of key parts, effectively resisting deformation and fatigue damage under high loads, and breaking through the technical bottleneck of the existing equal-diameter inner ring limiting the local strengthening of the shaft assembly 20. In this way, the shaft assembly 20 with a larger outer diameter has stronger deformation resistance, which can reduce the risk of deformation or fracture in the stress-concentrated areas of the shaft assembly 20.

[0052] The rolling state of the double-row different-diameter hub system includes: the first inner ring module 131 and the second inner ring module 132 rotate relative to the outer ring unit 11, and at least part of the rolling units 12 simultaneously abut against the outer ring unit 11 and the first inner ring module 131, respectively, and at least part of the rolling units 12 simultaneously abut against the outer ring unit 11 and the second inner ring module 132, respectively. Wherein, the maximum gap between the shaft assembly 20 and the first inner ring module 131 is greater than the maximum gap between the shaft assembly 20 and the second inner ring module 132; or, the interference amount between the shaft assembly 20 and the first inner ring module 131 is less than the interference amount between the shaft assembly 20 and the second inner ring module 132.

[0053] Wherein, the rotation of the first inner ring module 131 and the second inner ring module 132 relative to the outer ring unit 11 can be that the first inner ring module 131 and the second inner ring module 132 are fixed, and the outer ring unit 11 rotates; or, the first inner ring module 131 and the second inner ring module 132 rotate, and the outer ring unit 11 is fixed. Specifically, when the double-row different-diameter hub system is configured at the driven wheel, the shaft assembly 20 is relatively fixed with the automobile chassis, and the shaft assembly 20 provides support for the first inner ring module 131 and the second inner ring module 132 during vehicle driving, and the outer ring unit 11 rotates under the driving of the hub rim; when the double-row different-diameter hub system is configured at the driven wheel, the outer ring unit 11 is relatively fixed with the automobile chassis, and the shaft assembly 20 rotates and drives the first inner ring module 131 and the second inner ring module 132 to rotate during vehicle driving.

[0054] The cooperation design of the shaft assembly 20 and the second inner ring module 132 with larger interference amount or smaller gap can guide the main load to be concentrated on the cooperation section of the second inner ring module 132 and the shaft assembly 20 with better structural strength, avoid the stress peak value at the geometric discontinuous position, and significantly reduce the failure risk of bearing raceway spalling, cooperation surface wear and relaxation, shaft shoulder cracking, etc.

[0055] At the same time, while optimizing the stress distribution, the radial positioning stability of the hub system is ensured through the synergistic effect of the double-row rolling units 12, which not only solves the defect that the existing uniform load design cannot match the stress distribution, but also meets the durability demand under the high load working condition of the vehicle, finally prolongs the service life of the hub system and improves the driving safety of the vehicle.

[0056] Further, one end of the first inner ring module 131 abuts one end of the second inner ring module 132. The two inner ring modules directly abut through the end faces, which is equivalent to forming an axial rigid positioning reference, which can completely eliminate the axial gap between the first inner ring module 131 and the second inner ring module 132, and avoid the misalignment of the raceway position of the first inner ring module 131 and the second inner ring module 132 due to axial movement when the shaft assembly 20 rotates. The double-row rolling unit 12 can always maintain uniform contact with the raceways of the corresponding inner ring and outer ring, and will not cause unilateral contact or partial load problems due to inner ring misalignment. This can effectively avoid edge wear of the rolling unit 12, local peeling of the raceway, and other faults, significantly prolong the service life of the bearing assembly 10, while ensuring the smoothness of the hub rotation, reducing abnormal vibration and noise during driving.

[0057] Further, as shown in Figure 8 The shaft assembly 20 includes a first shaft 21, a second shaft 22, a third shaft 23, and a connecting shaft 24. The first shaft 21, the second shaft 22, the third shaft 23, and the connecting shaft 24 are coaxially connected in sequence. The outer diameter of the first shaft 21 is smaller than the outer diameter of the third shaft 23. The outer peripheral surface of the second shaft 22 is spaced apart from the inner peripheral wall of the first inner ring module 131 and the inner peripheral wall of the second inner ring module 132, respectively. The outer peripheral wall of the first shaft 21 abuts the inner peripheral wall of the first inner ring module 131. The outer peripheral wall of the third shaft 23 abuts the inner peripheral wall of the second inner ring module 132.

[0058] In actual production, the first shaft 21 and the third shaft 23 of the shaft assembly 20 may have size tolerances, or the inner diameters of the first inner ring module 131 and the second inner ring module 132 may deviate due to machining errors, and the coaxiality of the shaft assembly 20 and the coaxiality after the inner ring abuts may also have slight deviations. Without the second shaft 22, the first shaft 21 and the third shaft 23 are directly rigidly connected with the first inner ring module 131 and the second inner ring module 132, which is easy to cause the first shaft 21 to be stuck and unable to be installed in the first inner ring module 131 or the third shaft 23 to be loosely connected with the second inner ring module 132. The spacing design of the second shaft 22 is equivalent to leaving a buffer space between the two precise connection sections. Even if the connection sizes of the first shaft 21 and the first inner ring module 131 and the third shaft 23 and the second inner ring module 132 have slight deviations, the second shaft 22 will not interfere with the inner ring, which can ensure that the shaft assembly 20 can smoothly pass through the bearing assembly 10.

[0059] Further, the projection of the second shaft 22 on the circular arc surface of the inner wall of the second inner ring module 132 is spaced apart from the inner wall of the second inner ring module 132. If the projection of the second shaft 22 invades the inner circumferential space of the second inner ring module 132, the fitting length of the third shaft 23 in the second inner ring module 132 will be compressed, the contact area between the third shaft 23 and the second inner ring module 132 will be reduced, and the risk of stress concentration will be increased. The design of the projection spacing allows the second shaft 22 to completely avoid the inner circumferential circular arc surface of the second inner ring module 132, and the entire axial length of the second inner ring module 132 can be used for fitting with the third shaft 23, so that the third shaft 23 can form a full-segment fitting with the second inner ring module 132, and the fitting length is maximized. The bearing redundancy between the third shaft 23 and the second inner ring module 132 can be increased, so that even in high-stress working conditions such as heavy load and braking, the torque and radial load can be uniformly transmitted on the fitting surface to avoid wear and relaxation of the fitting surface due to insufficient contact area, and the long-term reliability of the main bearing connection is ensured.

[0060] Further, as shown in Figure 4 the outer extension ring 111, the flange ring 112, the first outer ring 113, and the second outer ring 114 are coaxially connected in sequence. The first outer ring 113 is correspondingly arranged with the first inner ring module 131. Part of the rolling element 12 is arranged between the first outer ring 113 and the first inner ring module 131. The second outer ring 114 is correspondingly arranged with the second inner ring module 132. Another part of the rolling element 12 is arranged between the second outer ring 114 and the second inner ring module 132.

[0061] When the outer extension ring 111 is directly connected to the hub steel ring as the outer ring unit 11, the outer shape of the outer extension ring 111 can be customized according to the bolt hole position and the mounting surface size of the hub steel ring, and the outer extension ring 111 is fixedly connected to the hub steel ring through bolts.

[0062] If the steel ring load received by the outer extension ring 111 is directly transmitted to the first outer ring 113, a stress peak will be formed at the transition between the outer extension ring 111 and the flange ring 112. The flange ring 112 can convert the concentrated load into uniformly distributed surface load through a larger radial cross-sectional area, and then transmit it to the first outer ring 113, avoiding the cracking of the first outer ring 113 caused by stress concentration. The flange ring 112 is equivalent to adding a rigid support bridge between the outer extension ring 111 and the first outer ring 113, which can resist the bending deformation of the outer ring unit 11 under complex load, ensure that the outer extension ring 111, the first outer ring 113, and the second outer ring 114 always remain coaxial, avoid the contact deviation of the rolling element 12 and the raceway caused by the eccentricity of the first outer ring 113, and further ensure the uniform stress of the double-row rolling element 12.

[0063] Furthermore, the outer diameter of the raceway on the second inner ring module 132 is larger than that on the raceway of the first inner ring module 131. With a fixed inner diameter of the second inner ring module 132, the increased outer diameter of the raceway directly means a simultaneous increase in the radial wall thickness of the inner ring. This increased wall thickness significantly enhances the overall rigidity and deformation resistance of the second inner ring module 132. When the vehicle is subjected to heavy loads or impact loads, the second inner ring module 132 can effectively resist radial compression deformation and axial bending deformation, avoiding geometric accuracy failures such as dents and warping of the raceway due to insufficient wall thickness. This ensures that the raceway maintains stable contact with the rolling unit 12, strengthening the damage resistance of the main load-bearing area from the structural root and achieving the high-strength design goal.

[0064] Furthermore, the inner diameter of the outer extension ring 111 is larger than the outer diameter of the first inner ring module 131. The outer extension ring 111 is the direct connecting component between the outer ring unit 11 and the wheel hub steel rim, while the first inner ring module 131 is the core component that mates with the first shaft 21 in the inner ring system. If there is no radial clearance between the two during assembly, the inner wall of the outer extension ring 111 will collide hard with the outer wall of the first inner ring module 131 during assembly, causing the outer extension ring 111 to deform, or increasing assembly time and reducing assembly efficiency due to assembly obstruction.

[0065] The design of the outer extension ring 111 having an inner diameter larger than the outer diameter of the first inner ring module 131 effectively provides a radial safety clearance between them. During assembly, the first inner ring module 131 can be easily fitted onto the first outer ring 113 through the inner hole of the outer extension ring 111, achieving initial positioning without the need for precise alignment, thereby improving assembly efficiency.

[0066] Furthermore, such as Figure 5 As shown, the rolling unit 12 includes a first rolling module 121 and a second rolling module 122. The first rolling module 121 includes a first rolling element 1211 and a first cage 1212. The second rolling module 122 includes a second rolling element 1221 and a second cage 1222.

[0067] The first cage 1212 is disposed between the first outer ring 113 and the first inner ring module 131. A plurality of first rolling elements 1211 are tactilely connected to the first cage 1212. The first rolling elements 1211 abut against the inner peripheral wall of the first outer ring 113 and the outer peripheral wall of the first inner ring module 131, respectively.

[0068] The second cage 1222 is disposed between the second outer ring 114 and the second inner ring module 132. A plurality of second rolling elements 1221 are tactilely connected to the second cage 1222. The second rolling elements 1221 abut against the inner peripheral wall of the second outer ring 114 and the outer peripheral wall of the second inner ring module 132, respectively.

[0069] The dual rolling modules precisely correspond to the inner and outer rings of the dual rows. The first module is adapted to the first inner and outer rings for auxiliary load-bearing, and the second module is adapted to the second inner and outer rings for main load-bearing, ensuring that the force on each load-bearing section matches the components. Moreover, the first cage 1212 and the second cage 1222 respectively restrict the movement of the first and second rolling elements 1221, preventing rolling element offset or collision, reducing raceway and rolling element wear due to uneven load, and ensuring stable force transmission.

[0070] The outer diameter of the second cage 1222 is larger than the outer diameter of the first cage 1212.

[0071] After the outer diameter of the second cage 1222 is increased, its outer circumference can fit the inner circumferential wall of the second outer ring 114, and its inner circumference can fit the outer circumferential wall of the second inner ring module 132. This ensures that the second rolling element 1221 is precisely constrained between the raceway of the second outer ring 114 and the raceway of the second inner ring module 132, avoiding rolling element wear or cage jamming caused by mismatch in structural dimensions, and ensuring the integrity of the load transmission path in the main load-bearing area.

[0072] In some embodiments, such as Figure 7 As shown, the first inner ring module 131 includes a first abutting ring 1311 and a first extension ring 1312. The second inner ring module 132 includes a second abutting ring 1321 and a second extension ring 1322. The first extension ring 1312 is connected to the side of the first abutting ring 1311 facing the second extension ring 1322; the second extension ring 1322 is connected to the side of the second abutting ring 1321 facing the first extension ring 1312. The first extension ring 1312 and the second extension ring 1322 abut against each other. The first rolling element 1211 abuts against both the first abutting ring 1311 and the first outer ring 113 simultaneously; the second rolling element 1221 abuts against both the second abutting ring 1321 and the second outer ring 114 simultaneously. This ensures that the first rolling element 1211 and the second rolling element 1221 do not have direct contact during rotation, and each corresponds to an independent abutment ring raceway. This avoids collision wear caused by differences in rolling element size or slight deviations in rotation speed, while preventing metal debris generated by the wear of one rolling element from contaminating the other rolling element, reducing the risk of chain failures, and extending the overall lifespan of the rolling unit 12.

[0073] In some embodiments, the dual-row differential hub system is configured on the driven wheel, such as Figure 1 As shown, the dual-row differential wheel system also includes wheels 30. Wheels 30 are connected to flange rings 112. Axle assembly 20 is fixed relative to the vehicle chassis, providing support for the first inner ring module 131 and the second inner ring module 132. During vehicle operation, the wheels 30 rotate due to friction with the ground, causing the flange ring 112 and other components of the outer ring unit 11 to rotate relative to the inner ring unit 13. The driven wheel 30, in conjunction with the drive wheel, provides support for the vehicle and enables smooth vehicle movement.

[0074] Embodiment two:

[0075] The application also provides a mounting method of the double-row different-diameter hub system, which is applied to the double-row different-diameter hub system in the embodiment one. As shown in the figure, the mounting method of the double-row different-diameter hub system includes steps S10 to S40. The sequence of the mounting method is step S10-step S20-step S30-step S40. Figure 9

[0076] Step S10: abut the partial rolling unit 12 with the first set region of the inner peripheral wall of the outer ring unit 11. It can provide a stable reference carrier for the subsequent installation of the first inner ring module 131, and clearly define the initial assembly position of the auxiliary bearing row, which can ensure the assembly accuracy of the auxiliary section in the double-row structure.

[0077] In other embodiments, the rolling unit 12 includes a first rolling module 121 and a second rolling module 122. The first rolling module 121 includes a first rolling body 1211 and a first retainer 1212. The outer ring unit 11 includes an outer extension ring 111, a first outer ring 113, and a second outer ring 114. The first set region is on the inner side wall of the first outer ring 113. As shown in the figure, step S10 includes steps S11 and S12. Figure 10

[0078] Step S11: pass the first retainer 1212 through the inner hole of the outer extension ring 111, and place the first retainer 1212 on the inner side wall of the first outer ring 113. The first retainer 1212 is a core component that restricts the position of the first rolling body 1211. By placing the first retainer 1212 on the inner side wall of the first outer ring 113 first, the circumferential distribution trajectory of the first rolling body 1211 can be pre-locked through the geometry of the retainer, avoiding the deviation and stacking of the rolling body during subsequent installation, laying the foundation for the precise contact between the first rolling body 1211 and the outer ring raceway, and reducing the hidden danger of one-sided stress of the rolling body caused by the deflection of the retainer.

[0079] Step S12: install a plurality of first rolling bodies 1211 in the pockets of the first retainer 1212, so that the plurality of first rolling bodies 1211 abut the first set region of the first outer ring 113. The first retainer 1212 has been pre-positioned, and the first rolling body 1211 can be directly embedded in the pocket of the first retainer 1212, which can improve the installation efficiency and will not damage the surface of the rolling body during installation.

[0080] ​​Step S20: abut the first inner ring module 131 with the rolling element 12 of the first set region. Based on the first column of rolling elements 12 that have been positioned, the first inner ring module 131 is directly abutted with the rolling body without the need for additional adjustment of the position of the rolling body. At the same time, the first column of matching pairs is formed in advance, which can serve as a temporary support structure for the subsequent assembly of the second column, reducing the shaking of the outer ring unit 11 in subsequent operations and improving the overall assembly stability.

[0081] In some other implementations, in step S20, the first inner ring module 131 is inserted through the inner hole of the outer extension ring 111, and the outer peripheral wall of the first inner ring module 131 is abutted with the first rolling body 1211 to complete the abutment of the first inner ring module 131 with the rolling element 12 of the first set region. The large inner diameter of the outer extension ring 111 provides sufficient radial clearance space for the first inner ring module 131, so that even if there is a slight size deviation or slight eccentricity during assembly, the first inner ring module 131 can still smoothly pass through the inner hole of the outer extension ring 111, avoiding interference with the inner wall of the outer extension ring 111.

[0082] Step S30: abut another part of the rolling element 12 with the second set region of the outer ring unit 11. Since the first column of matching pairs has been formed, the second column of rolling elements 12 can be installed separately at this time, which can avoid the problem of mutual collision and position interference between the two columns of rolling elements 12; at the same time, it provides a stable reference load for the subsequent assembly of the second inner ring module 132.

[0083] Further, the second rolling module 122 includes a second rolling body 1221 and a second retainer 1222. The inner diameter of the second outer ring 114 is larger than the inner diameter of the first inner ring module 131. The second set region is on the inner side wall of the second outer ring 114. As shown in Figure 10 Step S30 includes step S31 and step S32.

[0084] Step S31: based on the abutment of the first inner ring module 131 with the rolling element 12 of the first set region, install a plurality of second rolling bodies 1221 in the pocket holes of the second retainer 1222. Avoid the second rolling body 1221 from being randomly offset, stacked or collided during subsequent assembly, and ensure that the plurality of second rolling bodies 1221 form a ring-shaped force array.

[0085] Step S32: pass the second retainer 1222 together with the installed second rolling body 1221 through the inner hole of the second outer ring 114, place the second retainer 1222 on the inner side wall of the second outer ring 114, and make the plurality of second rolling bodies 1221 abut against the second designated area of the second outer ring 114. After the second retainer 1222 and the second rolling body 1221 are preassembled, they are integrally installed, which can avoid the second rolling body 1221 from falling or deviating in position when the second retainer 1222 is installed first and the second rolling body 1221 is installed later, and reduce the secondary adjustment action in the assembly process; at the same time, the integral installation can ensure that the relative position of the second rolling body 1221 and the second retainer 1222 does not change, which further guarantees the contact precision when the second inner ring module 132 abuts against the second rolling unit 12 in the second designated area.

[0086] Step S40: make the second inner ring module 132 abut against the rolling unit 12 in the second designated area. The second inner ring module 132 is the main bearing core of the system, so that the second inner ring module 132 abuts against the second column of rolling units 12 that have been positioned, and the rolling body can automatically align the second inner ring raceway and the second designated area, forming a high-strength main bearing cooperation.

[0087] In some other embodiments, in step S40, the outer peripheral wall of the second inner ring module 132 abuts against the second rolling body 1221, and at the same time, the second inner ring module 132 abuts against the first inner ring module 131 to complete the abutment of the second inner ring module 132 against the rolling unit 12 in the second designated area. With the pre-positioning of the second retainer 1222 and the second outer ring 114, the main bearing cooperation of the second inner ring module 132, the second rolling body 1221, and the second outer ring 114 can be quickly formed, which ensures that the raceway of the main bearing area completely matches the second rolling body 1221 and avoids stress concentration.

[0088] Those skilled in the art can understand that the above-mentioned embodiments are specific cases for implementing the present disclosure, and in actual applications, various changes can be made in form and details without departing from the scope of the present disclosure.

Claims

1. A dual row, step bore hub system, characterized by, The double-row different-diameter hub system comprises: A bearing assembly comprises an outer ring unit, a rolling unit, and an inner ring unit; the inner ring unit comprises a first inner ring module and a second inner ring module; the outer ring unit is sleeved on the outer circumferential side of the first inner ring module and the second inner ring module respectively; part of the rolling unit is arranged between the outer ring unit and the first inner ring module; another part of the rolling unit is arranged between the outer ring unit and the second inner ring module; the inner diameter of the first inner ring module is smaller than the inner diameter of the second inner ring module; A shaft assembly is respectively arranged in the central hole of the first inner ring module and the central hole of the second inner ring module; The rolling state of the double-row different-diameter hub system comprises: the first inner ring module and the second inner ring module rotate relative to the outer ring unit, and at least part of the rolling unit simultaneously abuts against the outer ring unit and the first inner ring module, and at least part of the rolling unit simultaneously abuts against the outer ring unit and the second inner ring module; wherein the maximum gap between the shaft assembly and the first inner ring module is greater than the maximum gap between the shaft assembly and the second inner ring module; or the interference amount between the shaft assembly and the first inner ring module is smaller than the interference amount between the shaft assembly and the second inner ring module.

2. The double-row different-diameter hub system according to claim 1, wherein One end of the first inner ring module abuts against one end of the second inner ring module.

3. The double-row different-diameter hub system according to claim 1, wherein The shaft assembly comprises a first shaft, a second shaft, a third shaft, and a connecting shaft; the first shaft, the second shaft, the third shaft, and the connecting shaft are coaxially connected in sequence; the outer diameter of the first shaft is smaller than the outer diameter of the third shaft; the outer circumferential surface of the second shaft is arranged in a spaced manner with the inner circumferential wall of the first inner ring module and the inner circumferential wall of the second inner ring module; the outer circumferential wall of the first shaft abuts against the inner circumferential wall of the first inner ring module; and the outer circumferential wall of the third shaft abuts against the inner circumferential wall of the second inner ring module.

4. The double-row different-diameter hub system according to claim 3, wherein The projection of the second shaft on the arc surface of the inner circumferential wall of the second inner ring module is arranged in a spaced manner with the inner circumferential wall of the second inner ring module.

5. The double-row different-diameter hub system according to claim 1, wherein The outer ring unit comprises an outer extension ring, a flange ring, a first outer ring, and a second outer ring; the outer extension ring, the flange ring, the first outer ring, and the second outer ring are coaxially connected in sequence; The first outer ring and the first inner ring module are correspondingly arranged; part of the rolling unit is arranged between the first outer ring and the first inner ring module; the second outer ring and the second inner ring module are correspondingly arranged; and another part of the rolling unit is arranged between the second outer ring and the second inner ring module.

6. The double-row different-diameter hub system according to claim 1, wherein The outer diameter of the raceway on the second inner ring module is greater than the outer diameter of the raceway on the first inner ring module.

7. The double-row differential hub system of claim 5, wherein: an inner diameter of the outer extension ring is greater than an outer diameter of the first inner ring module.

8. The double-row differential hub system of claim 5, wherein: the rolling unit comprises a first rolling module and a second rolling module; the first rolling module comprises a first cage and a first rolling element; the second rolling module comprises a second cage and a second rolling element; the first cage is disposed between the first outer ring and the first inner ring module; a plurality of the first rolling elements are in rolling connection with the first cage; the first rolling elements are respectively in abutment with an inner peripheral wall of the first outer ring and an outer peripheral wall of the first inner ring module; the second cage is disposed between the second outer ring and the second inner ring module; a plurality of the second rolling elements are in rolling connection with the second cage; the second rolling elements are respectively in abutment with an inner peripheral wall of the second outer ring and an outer peripheral wall of the second inner ring module; an outer diameter of the second cage is greater than an outer diameter of the first cage.

9. A double-row differential hub system installation method, wherein: the double-row differential hub system installation method is applied to the double-row differential hub system of any one of claims 1-8; and the double-row differential hub system installation method comprises: abutting a portion of the rolling unit against a first designated area of an inner peripheral wall of the outer ring unit; abutting the first inner ring module against the rolling unit of the first designated area; abutting another portion of the rolling unit against a second designated area of the outer ring unit; abutting the second inner ring module against the rolling unit of the second designated area.

10. The double-row differential hub system installation method of claim 9, wherein: the rolling unit comprises a first rolling module and a second rolling module; the first rolling module comprises a first rolling element and a first cage; the second rolling module comprises a second rolling element and a second cage; the outer ring unit comprises an outer extension ring, a first outer ring, and a second outer ring; an inner diameter of the second outer ring is greater than an inner diameter of the first inner ring module; the first designated area is on an inner lateral wall of the first outer ring; and the second designated area is on an inner lateral wall of the second outer ring; the abutting another portion of the rolling unit against a second designated area of the outer ring unit comprises: based on the abutting of the first inner ring module against the rolling unit of the first designated area, passing the second cage through an inner hole of the second outer ring, and placing the second cage on the inner lateral wall of the second outer ring; installing a plurality of the second rolling elements in pockets of the second cage, so that the plurality of the second rolling elements are in abutment with the second designated area of the second outer ring.

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