Electromagnetic self-locking differential mechanism structure

Abstract

The invention belongs to the technical field of automobile transmission, and particularly relates to an electromagnetic self-locking differential structure which comprises a shell, a planet shaft, a first half axle gear, a second half axle gear, a planet gear, an electromagnetic driving part, a sliding lock and an elastic reset part. A sliding lock is arranged in a right half shell, the meshing positions of a second half axle gear, a planetary gear and a first half axle gear can be displaced leftwards, a shaft sleeve extends out of one side of the second half axle gear and is positioned in a second positioning hole, a second spline hole is formed in the shaft sleeve, and the second spline hole deviates rightwards relative to the second half axle gear. Therefore, the connection position of the second half axle gear and the original spline half axle of the vehicle can be kept consistent. The extension sleeve is arranged on one side of the first half axle gear, the first spline hole is formed in the extension sleeve, the first spline hole is staggered rightwards relative to the first half axle gear, and therefore it can be guaranteed that the connection position of the first half axle gear and the original spline half axle of the vehicle is kept consistent.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive transmissions, and particularly relates to an electromagnetic self-locking differential structure. Background Art

[0002] A differential gear mechanism can be disposed in a axle wheel assembly and is used to transmit torque from a drive shaft to a pair of output shafts. The drive shaft can drive the differential by using bevel gears that mesh with a ring gear mounted on the housing of the differential. In automotive applications, the differential allows the tires mounted at either end of the axle wheel assembly to rotate at different speeds. This is important when the vehicle is turning because the outer tire travels along an arc that is a greater distance than the inner tire. Therefore, the outer tire must rotate at a faster speed than the inner tire to compensate for the greater travel distance. The differential includes a differential housing and a gear arrangement that allows torque to be transmitted from the drive shaft to the output shafts while allowing the output shafts to rotate at different speeds as needed. The gear arrangement generally can include a pair of side gears that are mounted for rotation with the respective output shafts. A series of cross pins or pinion shafts are fixedly mounted to the differential housing to rotate therewith. A corresponding plurality of pinions are mounted to rotate with the pinion shafts and are in meshing relationship with the two side gears.

[0003] Ordinary differentials can allow the left and right wheels to rotate at different speeds. However, when one wheel spins idly, the other wheel on a good road surface cannot obtain torque either, and the vehicle loses its driving power. To avoid this situation, if the two wheels are connected together, the power can at least be transmitted to the other side wheel, enabling the vehicle to obtain driving power and thus get out of trouble. Therefore, various differential locking mechanisms need to be set in the differential. For example, the differential lock structure was first developed by Eaton Corporation in the United States and applied to off-road vehicles and the like. And through decades of development, the differential can utilize electromagnetic technology to automatically and arbitrarily switch the clutch state of the differential lock. For example, a kind of electromagnetic differential lock for vehicles disclosed in the Chinese patent document with the publication number CN119435671A includes a housing and a differential mechanism arranged in the housing, and a locking mechanism arranged on one side of the housing for locking the differential mechanism. An electromagnetic component acting on the locking mechanism is provided at the outer end of the housing to control the action of the locking mechanism through the electromagnetic component; the differential mechanism includes a first half shaft gear and a second half shaft gear arranged in the housing, and the locking mechanism includes a coupling ring arranged at the outer end of the first half shaft gear. A matching tooth structure is provided on the opposite side of the coupling ring and the first half shaft gear, and a wave spring that pops open is arranged between the coupling ring and the first half shaft gear. Claws are annularly distributed at the outer end of the coupling ring, and the claws pass through the corresponding claw holes of the housing to be connected with the electromagnetic component. The electromagnetic component controls the movement of the coupling ring through the claws to achieve differential locking and fixation. The main housing drives the coupling ring to rotate, and the coupling ring is pressed against the spacer by the wave spring and drives the spacer to rotate together. When the differential locking function is activated, the electromagnetic coil adsorbs the spacer to generate braking, so that a speed difference is generated between the spacer and the main housing. The coupling ring abuts against the spiral groove through the spherical surface at the end of the claw, and the inclined end face lift of the spiral groove is used to push the coupling ring to perform axial displacement, so that the coupling ring locks with the first half shaft gear. When resetting, the electromagnetic coil is powered off, and the coupling ring moves under the push of the wave spring to disengage the first coupling tooth and the second coupling tooth.

[0004] For the current situation, many vehicles (non-extreme off-road vehicles) usually do not have the self-locking function of the differential, so they cannot meet the needs of some users. Therefore, some users, in order to achieve this function, will modify the vehicle by replacing the original differential with a differential with an electromagnetic lock (such as an Eaton differential). Or automobile manufacturers will also install a differential with an electromagnetic lock on the original vehicle models. Since the differential assembly is replaced and the electromagnetic drive structure is added, the structure of the differential will change, resulting in the need to change the position of the half shaft gear in the differential assembly to meet the installation requirements of the bearing position of the differential assembly. However, this will cause the position of the spline hole of the half shaft gear to change. In order to meet the connection between the half shaft gear and the transmission half shaft, it is necessary to change the length of the half shaft, thus changing the structure of the vehicle drive shaft. This will not only increase the modification cost but also change the original transmission performance of the vehicle, increasing potential safety hazards and other problems. Summary of the Invention

[0005] The object of the present invention is to provide an electromagnetic self-locking differential structure, which can realize the interchange of the original differential assembly of an automobile without changing the original transmission structure, reduce the modification cost, and maintain the original transmission stability of the vehicle to avoid potential safety hazards caused by uncertain factors.

[0006] To achieve the above object, an electromagnetic self-locking differential structure provided by an embodiment of the present invention includes a housing, a planetary shaft, a first half shaft gear, a second half shaft gear, a planetary gear, an electromagnetic driving member, a sliding lock and an elastic reset member;

[0007] The housing includes a left half housing and a right half housing. Both the left half housing and the right half housing include a first end for mutual combination and a second end for installing bearings. The first ends of the left half housing and the right half housing are provided with semi-holes arranged radially along the housing. After the left half housing and the right half housing are combined, a planetary shaft hole is formed, and the planetary shaft hole radially penetrates the housing. A first positioning hole is provided on the inner end face of the left half housing, and a second positioning hole is provided on the inner end face of the right half housing. The planetary shaft includes a positioning sleeve, and the positioning sleeve is provided with a positioning shaft extending into the planetary shaft hole. The planetary gear is sleeved on the positioning shaft. A support hole is provided on one side of the positioning sleeve close to the left half housing;

[0008] The first half shaft gear is arranged in the left half housing and meshes with the planetary gear. A support ring positioned in the first positioning hole is provided on one side of the first half shaft gear, and an extension sleeve extending into the support hole is provided on the other side. A first spline hole extending from the end of the extension sleeve is provided in the first half shaft gear;

[0009] The second half shaft gear is arranged in the right half housing and meshes with the planetary gear. A first locking tooth and a shaft sleeve are provided on one side of the second half shaft gear, and the shaft sleeve extends into the second positioning hole. A second spline hole extending from the end of the shaft sleeve is provided in the second half shaft gear. The first spline hole and the second spline hole are asymmetrically arranged with the planetary shaft as the center. The first spline hole is closer to the center of the planetary shaft, and the second spline hole is farther from the center of the planetary shaft;

[0010] A support ring and a clearance groove penetrating the right half housing are provided on the inner end face of the right half housing. The sliding lock is slidably sleeved on the support ring. A second locking tooth for meshing with the first locking tooth is provided on one side of the sliding lock, and a connecting portion passing through the clearance groove and abutting against the electromagnetic driving member is provided on the other side. The elastic reset member is arranged between the sliding lock and the second half shaft gear for pushing the sliding lock away from the second half shaft gear.

[0011] Further, the planetary shaft holes are cross - distributed, the positioning sleeve is provided with four groups of the positioning shafts, and each of the positioning shafts is provided with a planetary gear.

[0012] Further, a boss is provided on the right side of the second half - shaft gear, and the first locking tooth is arranged on the boss; an annular groove is provided on one side of the sliding lock, the elastic resetting member is a wave spring, one end of the elastic resetting member is sleeved on the boss, and the other end is clamped in the annular groove.

[0013] Further, a magnetic - isolation push plate is provided between the electromagnetic driver and the sliding lock. One side of the magnetic - isolation push plate abuts against the electromagnetic driver, a connecting member is formed by bending the magnetic - isolation push plate towards the other side, and the connecting member is clamped with the connecting portion; the magnetic - isolation push plate is made of non - magnetic - conducting material.

[0014] Further, a clamping groove and a guiding groove are provided on the outer side of the connecting portion, and the guiding groove is perpendicular to the clamping groove; the end of the connecting member is provided with a clamping portion bent inwards for clamping in the clamping groove.

[0015] Further, the electromagnetic driving member includes a housing, an electromagnetic coil, a mounting cover, a guiding sleeve and a sliding sleeve; the guiding sleeve is arranged on the outer ring of the right half - shell, and a supporting member extends outwards from one end of the guiding sleeve away from the sliding lock; the sliding sleeve is sleeved on the guiding sleeve, the housing includes an inner ring and an outer ring, the electromagnetic coil is arranged between the inner ring and the outer ring, an installation hole is provided on one side of the housing, and the supporting member is supported in the installation hole; the mounting cover covers the housing, and the outer ring of the housing is supported on the mounting cover. A plurality of supporting protrusions are provided on the inner ring of the mounting cover, and the supporting protrusions support the outer side of the sliding sleeve.

[0016] Further, the sliding sleeve includes a magnetic - conducting sleeve and a wear - resistant ring; the magnetic - conducting sleeve is slidably sleeved on the guiding sleeve, an avoidance ring groove is provided on the inner ring of the magnetic - conducting sleeve, and supporting portions are formed on both sides of the avoidance ring groove; the wear - resistant ring is clamped at the end of the magnetic - conducting sleeve.

[0017] A conical ring extends inside the mounting cover, a buffer hole is formed in the conical ring, a conical surface is provided on the outer ring of the magnetic - conducting sleeve, and the maximum outer - diameter portion of the conical surface is not less than the inner diameter of the buffer hole.

[0018] Further, a gap is provided between the connecting portion and the avoidance groove, so that the sliding lock can rotate relative to the housing.

[0019] Further, a plurality of bosses are further provided on one side of the sliding lock close to the inner end face of the right half - shell.

[0020] Further, an outer positioning ring extends from the first end of the left half shell, and a positioning step is provided on the outer circumference of the first end of the right half shell for positioning and cooperating with the outer positioning ring.

[0021] One or more of the above technical solutions in the electromagnetic self-locking differential structure provided by the embodiments of the present invention at least have the following technical effects:

[0022] 1. In the case where it is necessary to overcome differential, the electromagnetic driving member drives the sliding lock to move towards the second half shaft gear, so that the second locking teeth and the first locking teeth are engaged with each other, then the second half shaft gear forms a transmission whole with the housing through the sliding lock, the second half shaft gear and the housing rotate together, and under the action of the planetary gear, the first half shaft gear and the second half shaft gear are connected as a transmission whole, avoiding the problem of differential rotation between the first half shaft gear and the second half shaft gear, and thus the problem of vehicle skidding can be overcome.

[0023] 2. When the sliding lock is arranged in the right half shell, the meshing positions of the second half shaft gear, the planetary gear and the first half shaft gear will shift to the left. An axle sleeve extends from one side of the second half shaft gear, and the axle sleeve is positioned in the second positioning hole. A second spline hole is arranged in the axle sleeve, and the second spline hole is offset to the right relative to the second half shaft gear. Therefore, it can be ensured that the connection position between the second half shaft gear and the original splined half shaft of the vehicle remains the same, and the distance between the second spline hole and the bearing installation position remains the same as the distance between the second spline hole and the bearing installation position of the original vehicle differential. An extension sleeve is arranged on one side of the first half shaft gear, and a first spline hole is arranged in the extension sleeve, and the first spline hole is offset to the right relative to the first half shaft gear. Therefore, it can be ensured that the connection position between the first half shaft gear and the original splined half shaft of the vehicle remains the same, and the distance between the first spline hole and the bearing installation position remains the same as the distance of the original differential. Therefore, when the electromagnetic self-locking differential structure replaces the original differential assembly, it can be matched and connected with the original transmission system of the vehicle, and the structure of the original transmission system of the vehicle does not need to be changed, which not only has low cost but also ensures the stability of transmission.

[0024] 3. A support ring and an extension sleeve extend from the first half shaft gear, and the extension sleeve is matched with the support hole, and the support ring is matched with the first positioning hole. Therefore, the stability of the first half shaft gear installed in the left half shell is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1Structural schematic diagram of the electromagnetic self-locking differential structure provided by the embodiment of the present invention.

[0027] Figure 2 Cross-sectional view of the electromagnetic self-locking differential structure provided by the embodiment of the present invention.

[0028] Figure 3 Axonometric view of the cross-sectional view of the electromagnetic self-locking differential structure provided by the embodiment of the present invention.

[0029] Figure 4 Structural diagram of the housing of the electromagnetic self-locking differential structure provided by the embodiment of the present invention.

[0030] Figure 5 Cross-sectional view of the housing of the electromagnetic self-locking differential structure provided by the embodiment of the present invention.

[0031] Figure 6 Structural diagram of the electromagnetic driving member of the electromagnetic self-locking differential structure provided by the embodiment of the present invention.

[0032] Figure 7 Cross-sectional view of the electromagnetic driving member of the electromagnetic self-locking differential structure provided by the embodiment of the present invention.

[0033] Figure 8 Structural diagram of the sliding lock of the electromagnetic self-locking differential structure provided by the embodiment of the present invention.

[0034] Figure 9 Structural diagram of the planetary shaft of the electromagnetic self-locking differential structure provided by the embodiment of the present invention.

[0035] Figure 10 Cross-sectional view of another embodiment of the electromagnetic driving member of the electromagnetic self-locking differential structure provided by the embodiment of the present invention.

[0036] Figure 11 Cross-sectional view of another implementation of the electromagnetic self-locking differential structure provided by the embodiment of the present invention with a magnetic isolation push piece provided.

[0037] Figure 12 Structural diagram of the connection between the magnetic isolation push piece and the sliding lock of the electromagnetic self-locking differential structure provided by the embodiment of the present invention.

[0038] Figure 13 Cross-sectional view of the connection between the magnetic isolation push piece and the sliding lock of the electromagnetic self-locking differential structure provided by the embodiment of the present invention.

[0039] Figure 14 Structural diagram of the sliding lock of the electromagnetic self-locking differential structure provided by the embodiment of the present invention.

[0040] Figure 15 Structural diagram of the magnetic isolation push piece of the electromagnetic self-locking differential structure provided by the embodiment of the present invention. Detailed implementation manners

[0041] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0042] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0044] In the embodiments of the present invention, unless otherwise clearly specified and limited, terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0045] In an embodiment of the electromagnetic self-locking differential of the present invention, please refer to Figures 1 to 5 The electromagnetic self-locking differential includes a housing 100, a planetary shaft 200, a first half shaft gear 300, a second half shaft gear 800, a planetary gear 400, an electromagnetic driving member 500, a sliding lock 600, and an elastic reset member 700.

[0046] Specifically, refer to Figures 1 to 5, the housing 100 includes a left half-shell 110 and a right half-shell 120. Both the left half-shell 110 and the right half-shell 120 include a first end for combination with each other and a second end for installing bearings. The first ends of the left half-shell 110 and the right half-shell 120 are provided with semi-holes arranged radially along the housing 100. After the left half-shell 110 and the right half-shell 120 are combined, a planetary shaft hole 101 is formed, and the planetary shaft hole 101 penetrates the housing 100 radially. The inner end face of the left half-shell 110 is provided with a first positioning hole 111, and the inner end face of the right half-shell 120 is provided with a second positioning hole 121. The planetary shaft 200 includes a positioning sleeve 210. The positioning sleeve 210 is provided with a positioning shaft 220 extending into the planetary shaft hole 101, and the planetary gear 400 is sleeved on the positioning shaft 220; a support hole 211 is provided on one side of the positioning sleeve 210 close to the left half-shell 110. The first half-shaft gear 300 is arranged in the left half-shell 110 and meshes with the planetary gear 400. A support ring 310 positioned in the first positioning hole 111 is provided on one side of the first half-shaft gear 300, and an extension sleeve 320 extending into the support hole 211 is provided on the other side. A first spline hole 301 extending from the end of the extension sleeve 320 is provided in the first half-shaft gear 300. Therefore, the first spline hole 301 is arranged closer to the planetary shaft 200. In order to avoid interference between the spline shaft and the first spline hole 301, a clearance hole 302 is arranged in the support ring 310. The diameter of the clearance hole 302 is larger than that of the first spline hole 301. Therefore, when the spline shaft is connected with the spline hole 301 in a matching manner, interference of the support ring 310 on the spline shaft is avoided.

[0047] The second half-shaft gear 800 is arranged in the right half-shell 120 and meshes with the planetary gear 400. A first locking tooth 801 and a shaft sleeve 810 are provided on one side of the second half-shaft gear 800. The shaft sleeve 810 extends into the second positioning hole 121 and extends to a position corresponding to the inner ring of the electromagnetic driving member. A second spline hole 802 extending from the end of the shaft sleeve 810 is provided in the second half-shaft gear 800. The first spline hole 301 and the second spline hole 802 are arranged asymmetrically with the planetary shaft 200 as the center, and the first spline hole 301 is arranged closer to the center of the planetary shaft 200, while the second spline hole 802 is arranged farther from the center of the planetary shaft 200.

[0048] The inner end face of the right half shell 120 is provided with a support ring 122 and a clearance groove 123 penetrating the right half shell 120. The sliding lock 600 is slidably sleeved on the support ring 122. Specifically, when the sliding lock 600 is arranged inside the right half shell 120, the tooth-shaped part of the second half shaft gear 800 will be displaced to the left. One side of the sliding lock 600 is provided with a second locking tooth 601 for meshing with the first locking tooth 801, and the other side is provided with a connecting part 610 passing through the clearance groove 123 and abutting against the electromagnetic driving part 500. Specifically, an installation position extends from the second end of the right half shell 120, and the electromagnetic driving part 500 is sleeved on the installation position. In order to ensure the position of the bearing installation position, the tooth-shaped position of the second half shaft gear 800 will be closer to the left side of the housing 100. An elastic resetting part 700 is arranged between the sliding lock 600 and the second half shaft gear 800 for pushing the sliding lock 600 away from the second half shaft gear 800.

[0049] For the electromagnetic self-locking differential structure of the above embodiment, when differential self-locking is required, the electromagnetic driving part 500 drives the sliding lock 600 to move towards the second half shaft gear 800, so that the second locking tooth 601 and the first locking tooth 802 mesh with each other, then the second half shaft gear 800 forms a transmission whole with the housing 100 through the sliding lock 600, and the second half shaft gear 800 rotates together with the housing 100. And under the action of the planetary gear 400, the first half shaft gear 300 and the second half shaft gear 800 are connected into a transmission whole, avoiding the problem of differential rotation between the first half shaft gear 300 and the second half shaft gear 800, and thus the problem of vehicle skidding can be overcome.

[0050] Since the electromagnetic self-locking differential structure of this embodiment sets the sliding lock 600 inside the right half shell 120 and the electromagnetic driving member 500 on the right half shell 120, it will cause the meshing positions of the second half shaft gear 800, the planetary gear 400 and the first half shaft gear 300 to need to be displaced to the left. In order to overcome the normal connection between the first half shaft gear 300 and the second half shaft gear 800 and the original drive shaft of the vehicle. Therefore, a shaft sleeve 810 extends out on one side of the second half shaft gear 800, and the shaft sleeve 810 is positioned in the second positioning hole 121. Therefore, by setting the shaft sleeve 810, the length of the second half shaft gear 800 is increased relative to it, and the mating position of the second half shaft gear 800 and the right half shell 120 extends to the right. And by setting the second spline hole 802 inside the shaft sleeve 810, the second spline hole 802 is set to deviate to the right relative to the second half shaft gear 800. Therefore, it can be ensured that the connection position of the second half shaft gear 800 and the original spline half shaft of the vehicle remains consistent, and the distance between the second spline hole 802 and the bearing mounting position also remains unchanged. And by setting an extension sleeve 320 extending into the positioning sleeve 210 on one side of the first half shaft gear 300 and setting the first spline hole 301 inside the extension sleeve 320, the first spline hole 301 is displaced to the right relative to the first half shaft gear 300. Therefore, it can be ensured that the connection position of the first half shaft gear 300 and the original spline half shaft of the vehicle remains consistent, and the distance between the first spline hole 301 and the bearing mounting position is consistent with the original differential. Therefore, after the meshing position of the half shaft gear and the planetary gear of this electromagnetic self-locking differential structure changes, it can still ensure the connection between the half shaft gear and the original transmission system, and there is no need to change the structure of the transmission system, which not only has low cost but also ensures the stability of transmission. In addition, the first half shaft gear 300 extends with a support ring 310 and an extension sleeve 320, and the extension sleeve 320 cooperates with the support hole 211, while the support ring 310 cooperates with the first positioning hole 111. Therefore, the first half shaft gear 300 is supported by the left half shell 110 and the planetary shaft 200, thus increasing the stability of the first half shaft gear 300 installed in the left half shell 110.

[0051] Furthermore, referring to Figure 9 , the planetary shaft holes 101 are cross-distributed, and the positioning sleeve 210 is provided with four groups of positioning shafts 220, and each positioning shaft 220 is provided with a planetary gear 400.

[0052] Furthermore, a boss 820 is provided on the right side of the second half-shaft gear 800, and a first locking tooth 801 is provided on the boss 820. An annular groove 602 is provided on one side of the slide lock 600, and the elastic reset member 700 is a wave spring, one end of the elastic reset member 700 is sleeved on the outer ring of the boss 820, and the other end is clamped in the annular groove 602. Furthermore, in order to reduce wear, a washer is also sleeved on the outer ring of the boss 820, and one end of the elastic reset member 700 abuts against the washer. Furthermore, the washer is bent to form a limit member, and a limit groove is provided on the outer side of the slide lock 600, the limit member is clamped in the limit groove, and the effective matching length of the limit member and the limit groove is greater than the stroke of the elastic reset member 700. Therefore, when the second half-shaft gear 800 rotates relative to the housing 100 and the slide lock 600, the washer is an integral unit with the slide lock 600, so the washer and the second half-shaft gear 800 rub against each other without causing friction with the elastic return member 700, thereby protecting the elastic return member 700 and the second half-shaft gear 800.

[0053] Furthermore, in order to prevent the magnetism of the electromagnetic driver 500 from being transmitted to the slide lock 600, a magnetic isolation push sheet 900 is provided between the electromagnetic driver 500 and the slide lock 600. Figure 2 , Figure 3 and 6 and Figure 7 . And one side of the magnetic isolation push piece 900 is in contact with the electromagnetic driver 500,

[0054] Further, the magnetic isolation push piece 900 is connected to the slide lock 600 in an embodiment, specifically referring to Figure 2 , Figure 3 Figure 6 and Figure 7 . The magnetic isolation push piece 900 is bent to the other side to form a connecting piece 910, and the connecting piece 910 is snap-connected with the connecting part 610. The magnetic isolation push piece 900 is made of non-magnetic conductive material, preferably 304 stainless steel. In this embodiment, the magnetic isolation push piece 900 can be pushed by the electromagnetic driving component 500, and the magnetic isolation push piece 900 can push the slide lock 600 to move again. Since the magnetic isolation push piece 900 can isolate the magnetic conduction of the electromagnetic driving component 500 to the slide lock 600, it can prevent the iron powder in the differential from being adsorbed in the second lock tooth 601 of the slide lock 600 and the first lock tooth 801 of the second half-shaft gear 800, thereby preventing the slide lock 600 and the second half-shaft gear 800 from being stuck. In addition, the magnetic isolation push piece 900 can also prevent the iron powder formed in the differential from entering the electromagnetic driving component 500 and causing the electromagnetic driving component 500 to wear or get stuck.

[0055] Further, refer to Figure 8, a clamping groove 611 and a guiding groove 612 are provided on the outer side of the connecting portion 610, and the guiding groove 612 is perpendicular to the clamping groove 611. An inwardly bent clamping portion 911 is provided at the end of the connecting member 910 for being clamped in the clamping groove 611. Specifically, when the magnetic shielding push piece 900 is connected to the sliding lock 600, the connecting member 910 slides from the guiding groove 612 into the clamping groove 611, so that the clamping portion 911 can be clamped into the clamping groove 611, connecting the magnetic shielding push piece 900 and the sliding lock 600 into a whole, and enabling the sliding lock 600 to slide smoothly under the drive of the electromagnetic driving member 500.

[0056] Furthermore, another embodiment of the connection between the magnetic shielding push piece 900 and the sliding lock 600. Specifically refer to Figures 11 to 15 , an opening groove 613 is provided on the outer peripheral side of the connecting portion 610. The opening groove 613 has a groove top 614. A plugging hole 615 is provided at the end of the connecting portion 610, and the plugging hole 615 penetrates through to the groove top 614. A latch pin 920 inserted into the corresponding plugging hole 615 is provided on one side of the magnetic shielding push piece 900. A limiting step 921 is provided on one side of the latch pin 920 for being limited at the groove top 614; the elastic reset member 700 squeezes the sliding lock 600, so that the groove top 614 extends out of the end face of the right half shell 120, and an avoidance groove is formed between the groove top 614 and the end face. In this embodiment, when it is necessary to disassemble the magnetic shielding push piece 900, due to the action of the elastic reset member 700, the connecting portion 610 extends out of the avoidance groove 123, and the groove top 614 of the opening groove 613 completely extends out of the end face and forms an avoidance groove. Therefore, a thin sheet can be used to insert into the avoidance groove to squeeze the latch pin 920, causing the latch pin 920 to elastically deform, and the limiting step 921 to disengage from the groove top 614, thereby disengaging each latch pin 920 from the groove top 614, so that the magnetic shielding push piece 900 can be smoothly disassembled from the connecting portion 610, and the magnetic shielding push piece 900 will not be damaged or broken and fall into the differential housing 100.

[0057] Preferably, the magnetic shielding push piece 900 and the latch pin 920 are integrally injection molded. Therefore, the latch pin 920 has good strength, is not easy to break, and has a certain elasticity to elastically deform, facilitating the insertion of the latch pin 920 into the plugging hole 615. In addition, the magnetic shielding push piece 900 can be an engineering plastic, so it can play a role in magnetic shielding and avoid magnetization.

[0058] Furthermore, refer to Figures 13 to 15 , the cross section of the latch pin 920 is in a semi-circular structure, and the limiting step 921 is provided on the arc surface of the latch pin 920. Therefore, the latch pin 920 can deform in the plugging hole 615. When using tools such as a thin sheet to squeeze the latch pin 920, the latch pin 920 can elastically deform.

[0059] Furthermore, refer to Figure 13 and Figure 14, the opening slot 613 also has a slot bottom and side walls. The insertion hole 615 penetrates through to the slot bottom and forms a semi-circular groove on the side wall. The semi-circular groove can be used to limit the position of the plug pin 920 and also enable the elastic deformation of the plug pin 920.

[0060] Further, please refer to Figures 11 to 15 , multiple protrusions 901 are provided on one side of the magnetic isolation push piece. The plug pin 920 is formed on the protrusions 901. The protrusions 901 are supported on the corresponding connecting part 610, so as to form a support gap between the magnetic isolation push piece 900 and the connecting part 610. In this embodiment, when the magnetic isolation push piece 900 is detached from the connecting part 610, when the limiting step 921 of the plug pin 920 is disengaged from the slot top by using a thin sheet, a support object can be inserted into the support gap to slightly lift the magnetic isolation push piece 900 upward, avoiding the re-engagement of the limiting step 921 of the plug pin 920 with the slot top 614, thereby facilitating the detachment of the magnetic isolation push piece 900.

[0061] Further, refer to Figure 7 , the electromagnetic driving part 500 includes a housing 510, an electromagnetic coil 520, a mounting cover 530, a guide sleeve 540 and a sliding sleeve 550. The guide sleeve 540 is arranged on the outer circle of the right half shell 120. One end of the guide sleeve 540 far from the sliding lock 600 extends outward with a support member 541. The guide sleeve 540 is made of non-magnetic material, such as brass, 304 stainless steel, and can also be ceramic, resin material, etc. The sliding sleeve 550 is sleeved on the guide sleeve 540. The housing 510 includes an inner circle 511 and an outer circle 512. The electromagnetic coil 520 is arranged between the inner circle 511 and the outer circle 512. An installation hole 513 is provided on one side of the housing 510. The support member 541 is supported in the installation hole 513, and the support member 541 can be fixed to the housing 510 by welding. The mounting cover 530 covers the housing, and the outer circle of the housing 510 is supported on the mounting cover 530. A plurality of support protrusions are provided on the inner circle of the mounting cover 530, and the support protrusions support the outside of the sliding sleeve 550. In this embodiment, an electromagnetic field is formed by the energization of the electromagnetic coil 520. The sliding sleeve 550 slides along the guide sleeve 540 under the action of the electromagnetic field, and then pushes the magnetic isolation push piece 900, and the magnetic isolation push piece 900 pushes the sliding lock 600 to slide. In addition, the electromagnetic driving part 500 is installed and supported through the guide sleeve 540, so that the structure is stable.

[0062] Further, refer to Figure 7 , the sliding sleeve 550 includes a magnetic conductive sleeve 552 and a wear-resistant ring 553; the magnetic conductive sleeve 552 is slidably sleeved on the guide sleeve 540. An avoidance ring groove 554 is provided on the inner circle of the magnetic conductive sleeve 552. Two support parts 555 are formed on both sides of the avoidance ring groove 54, so that the contact area between the magnetic conductive sleeve 552 and the guide sleeve 540 can be reduced, and the friction force can be reduced.

[0063] Preferably, in an embodiment of the magnetic sleeve 552, the magnetic sleeve 552 can be a permanent magnet. In order to prevent the magnetic sleeve 552 from being worn, the magnetic sleeve 552 is provided with a wear-resistant sleeve 551, and the wear-resistant sleeve 551 is sleeved on the guide sleeve 540. After the electromagnetic coil 520 is energized, a magnetic field opposite to that of the magnetic sleeve 552 is formed, which drives the magnetic sleeve 552 to move.

[0064] Furthermore, a conical ring 531 extends from the inner side of the mounting cover 530, and a buffer hole 532 is formed in the conical ring 531. The outer ring of the magnetic sleeve 552 is provided with a conical surface, and the maximum outer diameter of the conical surface is not less than the inner diameter of the buffer hole 532. In this embodiment, when the sliding sleeve 550 slides under the magnetic force, the conical surface of the outer ring of the magnetic sleeve 552 cooperates with the buffer hole 532, so that the noise caused by the impact of the sliding sleeve 550 can be reduced.

[0065] More preferably, another embodiment of the magnetic conductive sleeve 552, referring to Figure 10 In this embodiment, the magnetic sleeve 552 can also be an armature, and the mounting cover 530 is a magnetic material, such as pure iron DT4C. When the electromagnetic coil 520 is energized, the cone ring 531 will form magnetism, thereby moving the magnetic sleeve toward the cone ring 531. In this embodiment, since the magnetic sleeve 530 and the mounting cover 530 are both magnetic conductors, but they themselves do not have magnetism, a magnetic field is formed under the support of the electromagnetic coil 520. When the electromagnetic coil 520 is powered off, it does not have magnetism, so it effectively avoids the problem of the electromagnetic drive component 500 adsorbing iron powder.

[0066] Furthermore, a gap is provided between the connecting portion 610 and the avoidance groove 123, so that the slide lock 600 can rotate relative to the housing 100. In this embodiment, when the slide lock 600 needs to mesh with the second side gear 800, but the first locking tooth 801 and the second locking tooth 601 have not yet meshed, the end surface of the first locking tooth 801 will be in contact with the end surface of the second locking tooth 601; and because a gap is provided between the connecting portion 610 and the avoidance groove 123, the slide lock 600 can be rotated at a small angle relative to the housing 100 to adjust its position, and a certain buffer gap is formed, so that the first locking tooth 801 and the second locking tooth 601 can mesh better.

[0067] Furthermore, a plurality of bosses 603 are provided on one side of the slide lock 600 close to the inner end surface of the right half shell 120. This can reduce the contact area between the slide lock 600 and the right half shell 120 and reduce friction.

[0068] Further, refer to Figure 2 , Figure 3 and Figure 5, the first end of the left half shell 110 extends with an outer positioning ring 113, and the outer ring of the first end of the right half shell 120 is provided with a positioning step 124 for positioning and cooperating with the outer positioning ring 113. When the left half shell 110 and the right half shell 120 are combined, the combination accuracy can be improved.

[0069] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electromagnetic self-locking differential structure, characterized in that, It includes a housing, a planetary shaft, a first half shaft gear, a second half shaft gear, a planetary gear, an electromagnetic drive, a sliding lock, and an elastic return member; The housing includes a left half housing and a right half housing. Both the left half housing and the right half housing include a first end for combination with each other and a second end for installing a bearing. The first ends of the left half housing and the right half housing are provided with semi-holes arranged radially along the housing. After the left half housing and the right half housing are combined, a planetary shaft hole is formed, and the planetary shaft hole radially penetrates the housing. A first positioning hole is provided on the inner end face of the left half housing, and a second positioning hole is provided on the inner end face of the right half housing. The planetary shaft includes a positioning sleeve, and the positioning sleeve is provided with a positioning shaft extending into the planetary shaft hole. The planetary gear is sleeved on the positioning shaft. A support hole is provided on one side of the positioning sleeve close to the left half housing; The first half shaft gear is arranged in the left half housing and meshes with the planetary gear. A support ring positioned in the first positioning hole is provided on one side of the first half shaft gear, and an extension sleeve extending into the support hole is provided on the other side. A first spline hole extending from the end of the extension sleeve is provided in the first half shaft gear; The second half shaft gear is arranged in the right half housing and meshes with the planetary gear. A first locking tooth and a shaft sleeve are provided on one side of the second half shaft gear, and the shaft sleeve extends into the second positioning hole. A second spline hole extending from the end of the shaft sleeve is provided in the second half shaft gear. The first spline hole and the second spline hole are asymmetrically arranged with the planetary shaft as the center. The first spline hole is closer to the center of the planetary shaft, and the second spline hole is farther from the center of the planetary shaft; A support ring and a clearance groove penetrating the right half housing are provided on the inner end face of the right half housing. The sliding lock is slidably sleeved on the support ring. A second locking tooth for meshing with the first locking tooth is provided on one side of the sliding lock, and a connecting portion passing through the clearance groove and abutting against the electromagnetic drive is provided on the other side. The elastic return member is arranged between the sliding lock and the second half shaft gear and is used to push the sliding lock away from the second half shaft gear.

2. The electromagnetic self-locking differential structure according to claim 1, wherein: The planetary shaft holes are cross-distributed, and the positioning sleeve is provided with four groups of the positioning shafts, and each positioning shaft is provided with one planetary gear.

3. The electromagnetic self-locking differential structure according to claim 1, wherein: A boss is provided on the right side of the second half shaft gear, and the first locking tooth is arranged on the boss. An annular groove is provided on one side of the sliding lock. The elastic return member is a corrugated spring. One end of the elastic return member is sleeved on the boss, and the other end is clamped in the annular groove.

4. The electromagnetic self-locking differential structure according to any one of claims 1 to 3, characterized in that: A magnetic isolation push plate is provided between the electromagnetic driver and the sliding lock. One side of the magnetic isolation push plate abuts against the electromagnetic driver, and a connecting member is formed by bending the magnetic isolation push plate to the other side. The connecting member is clamped with the connecting portion. The magnetic isolation push plate is made of non-magnetic material.

5. The electromagnetic self-locking differential structure according to claim 4, wherein: A card slot and a guide slot are provided on the outer side of the connecting portion. The guide slot is perpendicular to the card slot. An inwardly bent clamping portion is provided at the end of the connecting member for clamping in the card slot.

6. The electromagnetic self-locking differential structure according to any one of claims 1 to 3, characterized in that: The electromagnetic driving member includes a housing, an electromagnetic coil, a mounting cover, a guide sleeve and a sliding sleeve; the guide sleeve is disposed on the outer circumference of the right half shell, and a support member extends outward from one end of the guide sleeve away from the sliding lock; the sliding sleeve is sleeved on the guide sleeve, the housing includes an inner ring and an outer ring, the electromagnetic coil is disposed between the inner ring and the outer ring, an installation hole is provided on one side of the housing, and the support member is supported in the installation hole; the mounting cover covers the housing, and the outer ring of the housing is supported on the mounting cover, and a plurality of support protrusions are provided on the inner ring of the mounting cover, and the support protrusions support the outside of the sliding sleeve.

7. The electromagnetic self-locking differential structure according to claim 6, characterized in that: The sliding sleeve includes a magnetic conductive sleeve and a wear-resistant ring; the magnetic conductive sleeve is slidably sleeved on the guide sleeve, an avoidance annular groove is provided on the inner ring of the magnetic conductive sleeve, and support portions are formed on both sides of the avoidance annular groove; the wear-resistant ring is clamped at the end of the magnetic conductive sleeve. A tapered ring extends from the inner side of the mounting cover, the tapered ring is formed with a buffer hole, a conical surface is provided on the outer ring of the magnetic conductive sleeve, and the maximum outer diameter portion of the conical surface is not less than the inner diameter of the buffer hole.

8. The electromagnetic self-locking differential structure according to claim 1, characterized in that: A gap is provided between the connecting portion and the avoidance groove, so that the sliding lock can rotate relative to the housing.

9. The electromagnetic self-locking differential structure according to claim 8, wherein: A plurality of protrusions are further provided on one side of the sliding lock close to the inner end surface of the right half shell.

10. The electromagnetic self-locking differential structure according to claim 1, wherein: An outer positioning ring extends from the first end of the left half shell, and a positioning step is provided on the outer circumference of the first end of the right half shell for positioning and cooperating with the outer positioning ring.

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