Differential device and model car

Abstract

The present invention discloses a differential device and a model car, wherein the differential device comprises: a housing; a differential assembly located in the housing, the differential assembly comprising a main drive gear, a planetary gear set, a first gear, a synchronous gear, a second gear and a sliding gear; a push spring; a switching assembly for controlling the sliding gear to engage or disengage with the synchronous gear, the switching assembly comprising a shift fork, a switching shaft, a switching arm, a push torsion spring and a drive motor, one end of the switching arm being fixed to the switching shaft, and the other end of the switching arm being connected to the drive motor; two ends of the push torsion spring being respectively connected to the switching arm and the housing; the push torsion spring being used to continuously apply force to the switching arm so that the shift fork continuously applies a force to the sliding gear that is away from the synchronous gear.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle transmission, and in particular to a differential device and a model car. Background Art

[0002] The vehicle's engine power is transmitted through the transmission, drive shaft, and other components before reaching the drive axle, where it is distributed to the left and right axles to drive the wheels. The drive axle is the final assembly, and its main components are the speed reducer and differential. The differential typically consists of planetary gears, a planetary carrier, and axle gears. The engine power enters the differential through the drive shaft, directly driving the planetary carrier. The planetary gears then drive the left and right axles, driving the left and right wheels, respectively.

[0003] When the car is going straight, the rotational speeds of the left and right wheels and the planetary carrier are equal and in a balanced state. However, when the car turns, the balanced state of the three is destroyed, causing the inner wheel speed to decrease and the outer wheel speed to increase. The function of the differential is to transmit power to the half-axles on both sides while allowing the half-axles on both sides to rotate at different speeds, so that the wheels on both sides can travel in an unequal manner in the form of pure rolling as much as possible, reducing the friction between the tires and the ground. However, the differential also has disadvantages. When the car encounters a bad road surface, such as sand or mud, as long as one wheel slips, the wheel on the other end of the differential will completely lose power and will not move. Therefore, when a drive wheel slips, the planetary carrier and the half-axle must be locked together to make the differential lose its differential effect, so that all the torque can be transferred to the drive wheel on the other side.

[0004] Currently, existing differentials have a differential lock for opening or closing the differential. When the gear set of the differential is partially locked, the differential effect of the differential is invalid, so that the wheels on both sides can get the same power. The differential lock on the current differential is usually directly driven by a motor to rotate the shift fork back and forth, so that the shift fork pushes the shift plate back and forth. The motor needs to be continuously powered. In addition, when the motor completely locks the gear set, two teeth may become stuck and not mesh, making the motor and gear set vulnerable to damage. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the present invention provides a differential device and a model car.

[0006] In a first aspect, an embodiment of the present invention provides a differential device, the differential device comprising:

[0007] case;

[0008] a differential assembly located in the housing, the differential assembly comprising a main drive gear member, a planetary gear set, a first gear member, a synchronous gear member, a second gear member, and a sliding gear member, the main drive gear member meshing with the synchronous gear member, the synchronous gear member being sleeved on the first gear member and meshing with the planetary gear set, the planetary gear set being meshed with the first gear member and the second gear member, respectively, the sliding gear member being sleeved on the second gear member and being movable along the axis of the second gear member, and the sliding gear member rotating synchronously with the second gear member;

[0009] a push spring located in the housing, the push spring being used to continuously apply a force to the sliding gear member toward the synchronous gear member;

[0010] A switching assembly is used to control the engagement or disengagement of the sliding gear member with the synchronous gear member. The switching assembly includes a shift fork, a switching shaft, a switching arm, a push torsion spring and a drive motor. The switching shaft passes through the housing and can rotate relative to the housing. The shift fork is fixed on the switching shaft and abuts against the sliding gear member. One end of the switching arm is fixed on the switching shaft, and the other end of the switching arm is connected to the drive motor; the two ends of the push torsion spring are respectively connected to the switching arm and the housing; the push torsion spring is used to continuously apply force to the switching arm so that the shift fork continuously applies a force to the sliding gear member back to the synchronous gear member.

[0011] The differential device according to the embodiment of the present invention has at least the following technical effects: the force applied by the drive motor to the switching arm is in the opposite direction to the force applied by the push torsion spring to the switching arm, and the force applied by the drive motor and the push torsion spring to the switching arm is converted into the force of the shift fork on the sliding gear member. When the force of the shift fork on the sliding gear member is greater than the force of the push spring on the sliding gear member, the sliding gear member is separated from the synchronous gear member; when the force of the shift fork on the sliding gear member is less than the force of the push spring on the sliding gear member, the sliding gear member moves to engage with the synchronous gear member.

[0012] According to some embodiments of the present invention, when the drive motor is stopped, the force applied by the shift fork to the sliding gear member is greater than the force applied by the push spring to the sliding gear member, and the sliding gear member is separated from the synchronous gear member; when the drive motor is turned on, the force applied by the drive motor to the switching arm can offset part of the force of the push torsion spring on the switching arm, so that the force applied by the push spring to the sliding gear member is greater than the force applied by the shift fork to the sliding gear member, and the sliding gear member moves to engage with the synchronous gear member.

[0013] According to some embodiments of the present invention, the first gear member includes a first inner tooth portion, a first shaft and a first outer tooth portion, the two ends of the first shaft are fixedly connected to the first inner tooth portion and the first outer tooth portion, respectively, the first inner tooth portion is engaged with the planetary gear set, and the first outer tooth portion is engaged with the wheel of the model car.

[0014] According to some embodiments of the present invention, the second gear member includes a second inner tooth portion, a second shaft and a second outer tooth portion, the two ends of the second shaft are fixedly connected to the second inner tooth portion and the second outer tooth portion, respectively, the second inner tooth portion is engaged with the planetary gear set, and the second outer tooth portion is engaged with the wheel of the model car, the sliding gear member is sleeved on the second shaft, the sliding gear member can slide along the axis of the second shaft, and the sliding gear member rotates synchronously with the second shaft.

[0015] According to some embodiments of the present invention, the sliding gear member includes a sliding inner tooth portion, a sliding cylinder and a sliding disc, the two ends of the sliding cylinder are fixedly connected to the sliding inner tooth portion and the sliding disc, respectively, the sliding inner tooth portion, the sliding cylinder and the sliding disc are integrally injection molded, the sliding inner tooth portion, the sliding cylinder and the sliding disc are all sleeved on the second shaft, and the sliding inner tooth portion is engaged or disengaged with the synchronous gear member.

[0016] According to some embodiments of the present invention, a fixed disk is provided on the second shaft, and the fixed disk is sleeved and fixed on the second shaft. The fixed disk is located on the side of the sliding disk away from the sliding inner tooth portion. The push spring is sleeved on the second shaft, and the push spring is located between the sliding disk and the fixed disk. The two ends of the push spring are respectively connected to the sliding disk and the fixed disk, and the push spring is in a compressed state.

[0017] According to some embodiments of the present invention, the shift fork is located between the sliding inner tooth portion and the sliding disc, and the shift fork abuts against a side of the sliding disc close to the sliding inner tooth portion.

[0018] According to some embodiments of the present invention, the shell is provided with a steel bar assembly, and the steel bar assembly includes a connecting seat and a long steel bar, the long steel bar is passed through the connecting seat and can slide relative to the connecting seat, the connecting seat is fixedly installed on the shell, one end of the long steel bar is connected to the driving motor, and the other end of the long steel bar is connected to the switching arm, and the driving motor can apply force to the switching arm through the long steel bar, and the force applied by the driving motor to the switching arm is opposite to the direction of the force applied by the push torsion spring to the switching arm.

[0019] In a second aspect, an embodiment of the present invention further provides a model car, comprising a differential device according to an embodiment of the first aspect of the present invention.

[0020] The model car according to the embodiment of the present invention has at least the following technical effects: the model car adopts the differential device, the force applied by the drive motor to the switching arm is opposite to the direction of the force applied by the push torsion spring to the switching arm, and the force applied by the drive motor and the push torsion spring to the switching arm is converted into the force of the shift fork on the sliding gear member. When the differential is required to play a differential role, the drive motor is not turned on, so that the force of the shift fork on the sliding gear member is greater than the force of the push spring on the sliding gear member, and the sliding gear member is separated from the synchronous gear member; when the differential is required not to play a differential role, the drive motor is turned on, so that the force of the shift fork on the sliding gear member is less than the force of the push spring on the sliding gear member, and the sliding gear member moves to engage with the synchronous gear member.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0023] Figure 1 is a schematic structural diagram of a differential device according to some embodiments of the present invention;

[0024] Figure 2 is a schematic structural diagram of a differential device according to some embodiments of the present invention from another angle;

[0025] Figure 3 is a front view of a differential device according to some embodiments of the present invention;

[0026] Figure 4 is a rear view of a differential device according to some embodiments of the present invention;

[0027] Figure 5 is a schematic structural diagram of a differential device with a hidden housing in some embodiments of the present invention;

[0028] Figure 6 yes Figure 5 Exploded diagram;

[0029] Figure 7 Schematic diagram of the structure of the switching component of some embodiments of the present invention.

[0030] Figure Number:

[0031] Housing 100, main drive gear 110, planetary gear set 120, push spring 130, synchronous gear 140, steel bar assembly 150, connecting seat 151, long steel bar 152;

[0032] A first gear member 200, a first inner tooth portion 210, a first outer tooth portion 220, a first shaft 230, and a first groove 231;

[0033] The second gear member 300, the second inner tooth portion 310, the second outer tooth portion 320, the second shaft 330, the second groove 331, and the fixing plate 332;

[0034] Sliding gear member 400, sliding inner gear portion 410, sliding cylinder 420, sliding disc 430;

[0035] Switch assembly 500 , shift fork 510 , switch shaft 520 , switch arm 530 , and push torsion spring 540 . DETAILED DESCRIPTION

[0036] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0038] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0039] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0040] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0041] According to some embodiments of the present invention, referring to Figures 1 to 7 , the differential device includes a housing 100, a differential assembly, a push spring 130 and a switching assembly 500; refer to Figures 5 and 6 , the differential assembly is located in the housing 100, and the differential assembly includes a main drive gear member 110, a planetary gear set 120, a first gear member 200, a synchronous gear member 140, a second gear member 300 and a sliding gear member 400. The main drive gear is located behind the synchronous gear member 140, and the main drive gear is meshed with the synchronous gear member 140. The planetary gear set 120 is located inside the synchronous gear member 140 and meshes with the synchronous gear member 140. The synchronous gear member 140 is sleeved on one end of the first gear member 200, the first gear member 200 is located on the left side of the planetary gear set 120, and the second gear member 300 is located on the right side of the planetary gear set 120. The planetary gear set 120 is meshed with the first gear member 200 and the second gear member 300 respectively; when the main drive gear member 110 rotates, the synchronous gear member 140 rotates with the main drive gear member 110, and the synchronous gear Component 140 will drive the planetary gear set 120 to rotate, and the rotation of the planetary gear set 120 can respectively drive the first gear member 200 and the second gear member 300 to rotate, and the first gear member 200 and the second gear member 300 can achieve differential rotation. The principle of the planetary gear differential is a conventional technical principle of those skilled in the art and will not be repeated here; the sliding gear member 400 is sleeved on the second gear member 300 and can move along the axial direction of the second gear member 300, and the sliding gear member 400 can engage or disengage with the synchronous gear member 140, and the rotation of the sliding gear member 400 can drive the second gear member 300 to rotate, and the sliding gear member 400 and the second gear member 300 rotate synchronously; the push spring 130 is located in the housing 100, and the push spring 130 can continuously apply a force toward the synchronous gear member 140 to the sliding gear member 400, that is, a left force; refer to Figures 5 to 7 The switching assembly 500 includes a shift fork 510, a switching shaft 520, a switching arm 530, a pushing torsion spring 540 and a driving motor. The driving motor is not shown in the figure. The switching shaft 520 is arranged to enter the interior of the housing 100 and can rotate relative to the housing 100. The shift fork 510 is fixed on the switching shaft 520 and abuts against the sliding gear part 400. One end of the switching arm 530 is fixedly mounted on the switching shaft 520, and the other end of the switching arm 530 is connected to the driving motor. One end of the pushing torsion spring 540 is connected to the switching arm 530, and the other end of the pushing torsion spring 540 is connected to the housing 100. The pushing torsion spring 540 can continuously apply force to the switching arm 530 so that the switching arm 530 and the switching shaft 520 continue to have a tendency to rotate, so that the shift fork 510 fixed on the switching shaft 520 continuously applies a force to the sliding gear part 400 that is back to the synchronous gear part 140, that is, a force to the right.

[0042] It should be noted that when the motor is not started, the torque continuously applied by the torsion spring 540 to the switching arm 530 is converted into a rightward force continuously applied by the shift fork 510 to the sliding gear 400, the magnitude of which is F1; the leftward force continuously applied by the spring 130 to the sliding gear 400 is F2, satisfying the following: F1>F2:

[0043] When the drive motor is not started, the shift fork 510 can push the sliding gear member 400 to the right to a position separated from the synchronous gear member 140 and make the sliding gear member 400 abut against the inner wall of the housing 100. At this time, the sliding gear member 400 remains stationary and the differential device plays a differential role.

[0044] When the drive motor is started, the force applied by the drive motor to the switching arm 530 is opposite to the direction of the force applied by the push torsion spring 540 to the switching arm 530. The force applied by the drive motor to the switching arm 530 is F3, and F3 gradually increases; when F1>F2+F3, the sliding gear member 400 remains stationary; when F3 gradually increases to meet the following: F2+F3>F1, the sliding gear member 400 moves to the left until it engages with the synchronous gear member 140. At this time, the differential does not function as a differential.

[0045] It should be noted that when F2+F3>F1, during the process of sliding to the left until engaging with the synchronous gear 140, F3 no longer gradually increases, and at this time, F3<F1.

[0046] It can be understood that when the drive motor is not started, the shift fork 510 continuously applies a rightward force F1 to the sliding gear member 400. When the drive motor is started, the shift fork 510 continuously applies a rightward force F1 minus F3 to the sliding gear member 400. Regardless of whether the drive motor is started or not, the shift fork 510 always applies a rightward force to the sliding gear member 400.

[0047] It can also be understood that this embodiment avoids the situation where the shift fork 510 needs to rotate back and forth to change the contact point with the sliding gear part 400, thereby pushing the sliding gear part 400 to the left or to the right. This can easily damage the shift fork 510 and also requires a large power of the drive motor, increasing energy consumption and cost. This embodiment does not require the shift fork 510 to rotate back and forth to push the sliding gear part 400 to move, and the power requirement of the drive motor is also small, reducing energy consumption and cost.

[0048] It can also be understood that the push spring 130 continuously applies a leftward force to the sliding gear part 400. When the motor is started, the sliding gear part 400 moves to the left to engage with the synchronous gear part 140. Sometimes, the head of the tooth portion at the left end of the sliding gear part 400 and the head of the tooth portion at the right end of the synchronous gear part 140 will be stuck to each other and unable to complete the engagement. Then, it is necessary to wait until the synchronous gear part 140 rotates a certain angle to complete the engagement. If a larger power drive motor is used to directly drive the shift fork 510 to push the sliding gear part 400 to move to the left and engage with the synchronous gear part 140, when the above situation is encountered, the drive motor, the sliding gear part 400, and the synchronous gear part 140 will be damaged, accelerating the wear of the parts. In this embodiment, the push spring 130 is used to apply a leftward force to the sliding gear part 400, and the drive motor only serves to offset a part of the force applied by the push torsion spring 540 to the switching arm 530, thereby indirectly controlling the movement of the sliding gear part 400. This can greatly reduce the power required by the drive motor and slow down the wear rate of the parts.

[0049] According to some embodiments of the present invention, referring to Figure 5 and Figure 6 The first gear member 200 includes a first inner gear portion 210, a first shaft 230 and a first outer gear portion 220. The right end of the first shaft 230 is fixedly connected to the first inner gear portion 210, and the left end of the first shaft 230 is fixedly connected to the first outer gear portion 220. The first inner gear portion 210 is engaged with the planetary gear set 120, and the first outer gear portion 220 is used to engage with the wheels of the model car. The synchronous gear member 140 is sleeved on the first shaft 230 and wraps around the first inner gear portion 210. The synchronous gear member 140 can rotate relative to the first shaft 230; the rotation of the main drive gear member 110 can drive the synchronous gear member 140 to rotate, thereby driving the planetary gear set 120 to rotate, and the rotation of the planetary gear set 120 can drive the first inner gear portion 210 to rotate, thereby driving the first shaft 230 and the first outer gear portion 220 to rotate. The rotation of the first outer gear portion 220 can drive the wheels connected to the first outer gear portion 220 to rotate.

[0050] According to some embodiments of the present invention, referring to Figure 5 and Figure 6The second gear member 300 includes a second inner tooth portion 310, a second shaft 330 and a second outer tooth portion 320. The left end of the second shaft 330 is fixedly connected to the second inner tooth portion 310, and the right end of the second shaft 330 is fixedly connected to the second outer tooth portion 320. The second inner tooth portion 310 is meshed with the planetary gear set 120, and the second outer tooth portion 320 is meshed with the wheel of the model car. The second shaft 330 is provided with a second groove 331 extending along the axis direction of the second shaft 330. The sliding gear member 400 is sleeved on the second shaft 330 and the sliding gear member 400 abuts against the second Groove 331, the sliding gear component 400 can slide along the axial direction of the second shaft 330, and the sliding gear component 400 rotates synchronously with the second shaft 330. It can be understood that when the sliding gear component 400 is sleeved on the second shaft 330, since the sliding gear component 400 is partially located in the second groove 331 and abuts against the second groove 331, when the sliding gear component 400 rotates, the sliding gear component 400 simultaneously abuts against the second groove 331 and the outer arc wall of the second shaft 330, so the rotation of the sliding gear component 400 can drive the second shaft 330 to rotate synchronously.

[0051] It should be noted that the first shaft 230 is provided with a first groove 231 , that is, the first shaft 230 and the second shaft 330 can be replaced with each other.

[0052] It can be understood that when the sliding gear member 400 is not engaged with the synchronous gear member 140, the rotation of the main drive gear can drive the synchronous gear member 140 to rotate, thereby driving the planetary gear set 120 to rotate, and the rotation of the planetary gear set 120 can drive the second inner tooth portion 310 to rotate, thereby driving the second shaft 330 and the second outer tooth portion 320 to rotate, and the rotation of the second outer tooth portion 320 can drive the wheels connected to the second outer tooth portion 320 to rotate; when the sliding gear member 400 is engaged with the synchronous gear member 140, the rotation of the main drive gear can drive the synchronous gear member 140 to rotate, and the rotation of the synchronous gear member 140 can drive the sliding gear member 400 and the planetary gear set 120 to rotate, and the rotation of the sliding gear member 400 drives the second shaft 330 to rotate, and the rotation of the planetary gear set 120 drives the first shaft 230 to rotate. At this time, the differential does not play a differential role.

[0053] According to some embodiments of the present invention, referring to Figure 5 and Figure 6 The sliding gear member 400 includes a sliding inner tooth portion 410, a sliding cylinder 420 and a sliding disc 430. The left end of the sliding cylinder 420 is fixedly connected to the sliding inner tooth portion 410, and the right end of the sliding cylinder 420 is fixedly connected to the sliding disc 430. The sliding inner tooth portion 410, the sliding cylinder 420 and the sliding disc 430 are integrally formed. The sliding inner tooth portion 410, the sliding cylinder 420 and the sliding disc 430 are all sleeved on the second shaft 330. The sliding inner tooth portion 410 is engaged or disengaged with the synchronous gear member 140.

[0054] According to some embodiments of the present invention, referring to Figure 5 and Figure 6 A fixed disk 332 is provided on the second shaft 330, and the fixed disk 332 is sleeved and fixed on the second shaft 330. The fixed disk 332 is located on the side of the sliding disk 430 away from the sliding inner tooth portion 410, that is, the fixed disk 332 is located on the right side of the sliding disk 430, and the push spring 130 is sleeved on the second shaft 330. The push spring 130 is located between the sliding disk 430 and the fixed disk 332. The two ends of the push spring 130 are respectively connected to the sliding disk 430 and the fixed disk 332. The push spring 130 is in a compressed state, so that the push spring 130 continuously applies a leftward force to the sliding disk 430.

[0055] According to some embodiments of the present invention, referring to Figures 5 to 7 The shift fork 510 is located between the sliding inner tooth portion 410 and the sliding disc 430. The shift fork 510 abuts against the side of the sliding disc 430 close to the sliding inner tooth portion 410, that is, the shift fork 510 abuts against the left side of the sliding disc 430. The sliding disc 430 is continuously applied with a rightward force during insertion and removal.

[0056] According to some embodiments of the present invention, referring to Figure 2 、 Figure 4 、 Figure 5 and Figure 6 A steel bar assembly 150 is provided on the rear side of the shell 100. The steel bar assembly 150 includes a connecting seat 151 and a long steel bar 152. The long steel bar 152 is passed through the connecting seat 151 and can slide relative to the connecting seat 151. The connecting seat 151 is fixedly installed on the shell 100. One end of the long steel bar 152 is connected to the driving motor, and the other end of the long steel bar 152 is connected to the switching arm 530. The driving motor can apply force to the switching arm 530 through the long steel bar 152. The force applied by the driving motor to the switching arm 530 is opposite in direction to the force applied to the switching arm 530 by the push torsion spring 540.

[0057] It is understandable that the long steel bar 152 is a cylindrical long thin bar, and the connection between the long steel bar 152 and the switching arm 530 requires the long steel bar 152 to be bent and inserted and tied to the switching arm 530 .

[0058] Throughout this specification, references to the term "some embodiments" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0059] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A differential device, applied to a model car, characterized in that: include: Housing (100); A differential assembly is located in the housing (100), the differential assembly includes a main drive gear member (110), a planetary gear set (120), a first gear member (200), a synchronous gear member (140), a second gear member (300) and a sliding gear member (400), the main drive gear member (110) is meshed with the synchronous gear member (140), the synchronous gear member (140) is sleeved on the first gear member (200) and meshed with the planetary gear set (120), the planetary gear set (120) is meshed with the first gear member (200) and the second gear member (300), the sliding gear member (400) is sleeved on the second gear member (300) and can move along the axis direction of the second gear member (300), and the sliding gear member (400) rotates synchronously with the second gear member (300); a push spring (130) located in the housing (100), the push spring (130) being used to continuously apply a force to the sliding gear member (400) toward the synchronous gear member (140); A switching assembly (500) is used to control the engagement or separation of the sliding gear member (400) and the synchronous gear member (140). The switching assembly (500) includes a shift fork (510), a switching shaft (520), a switching arm (530), a pushing torsion spring (540) and a driving motor. The switching shaft (520) passes through the housing (100) and can rotate relative to the housing (100). The shift fork (510) is fixed on the switching shaft (520) and abuts against the sliding gear member. The switching arm (530) is fixed to the switching shaft (520), and the other end of the switching arm (530) is connected to the driving motor; the two ends of the pushing torsion spring (540) are respectively connected to the switching arm (530) and the housing (100); the pushing torsion spring (540) is used to continuously apply force to the switching arm (530), so that the shift fork (510) continuously applies force to the sliding gear member (400) in a direction away from the synchronous gear member (140).

2. The differential device according to claim 1, characterized in that: When the drive motor stops, the force applied by the shift fork (510) to the sliding gear member (400) is greater than the force applied by the push spring (130) to the sliding gear member (400), and the sliding gear member (400) is separated from the synchronous gear member (140); When the drive motor is turned on, the force applied by the drive motor to the switching arm (530) can offset part of the force applied by the push torsion spring (540) to the switching arm (530), so that the force applied by the push spring (130) to the sliding gear member (400) is greater than the force applied by the shift fork (510) to the sliding gear member (400), and the sliding gear member (400) moves to engage with the synchronous gear member (140).

3. The differential device according to claim 1, wherein: The first gear member (200) comprises a first inner tooth portion (210), a first shaft (230) and a first outer tooth portion (220); two ends of the first shaft (230) are fixedly connected to the first inner tooth portion (210) and the first outer tooth portion (220), respectively; the first inner tooth portion (210) is meshed with the planetary gear set (120), and the first outer tooth portion (220) is meshed with the wheels of the model car.

4. The differential device according to claim 1, wherein: The second gear member (300) comprises a second inner tooth portion (310), a second shaft (330) and a second outer tooth portion (320); the two ends of the second shaft (330) are fixedly connected to the second inner tooth portion (310) and the second outer tooth portion (320), respectively; the second inner tooth portion (310) is engaged with the planetary gear set (120); the second outer tooth portion (320) is engaged with the wheels of the model car; the sliding gear member (400) is sleeved on the second shaft (330); the sliding gear member (400) is capable of sliding along the axis of the second shaft (330); and the sliding gear member (400) rotates synchronously with the second shaft (330).

5. The differential device according to claim 4, characterized in that: The sliding gear component (400) comprises a sliding inner tooth portion (410), a sliding cylinder (420) and a sliding disc (430); the two ends of the sliding cylinder (420) are fixedly connected to the sliding inner tooth portion (410) and the sliding disc (430), respectively; the sliding inner tooth portion (410), the sliding cylinder (420) and the sliding disc (430) are integrally injection-molded; the sliding inner tooth portion (410), the sliding cylinder (420) and the sliding disc (430) are all sleeved on the second shaft (330); and the sliding inner tooth portion (410) is engaged with or separated from the synchronous gear component (140).

6. The differential device according to claim 5, characterized in that: A fixed disk (332) is provided on the second shaft (330), and the fixed disk (332) is sleeved and fixed on the second shaft (330). The fixed disk (332) is located on the side of the sliding disk (430) away from the sliding inner tooth portion (410). The push spring (130) is sleeved on the second shaft (330), and the push spring (130) is located between the sliding disk (430) and the fixed disk (332). The two ends of the push spring (130) are respectively connected to the sliding disk (430) and the fixed disk (332), and the push spring (130) is in a compressed state.

7. The differential device according to claim 5, characterized in that: The shift fork (510) is located between the sliding inner tooth portion (410) and the sliding disc (430), and the shift fork (510) abuts against a side of the sliding disc (430) close to the sliding inner tooth portion (410).

8. The differential device according to claim 1, wherein: The housing (100) is provided with a steel bar assembly (150), and the steel bar assembly (150) includes a connecting seat (151) and a long steel bar (152), the long steel bar (152) is passed through the connecting seat (151) and can slide relative to the connecting seat (151), and the connecting seat (151) is fixedly installed on the housing (100), one end of the long steel bar (152) is connected to the driving motor, and the other end of the long steel bar (152) is connected to the switching arm (530), and the driving motor can apply a force to the switching arm (530) through the long steel bar (152), and the force applied by the driving motor to the switching arm (530) is opposite in direction to the force applied by the pushing torsion spring (540) to the switching arm (530).

9. A model car, characterized in that: The differential device comprises the differential device according to any one of claims 1 to 8.

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