CN217583070U - Differential device and model car - Google Patents

Abstract

The utility model discloses a differential mechanism device and model car, differential mechanism device includes: a housing; a differential assembly located within the housing, the differential assembly including a primary drive gear member, a planetary gear set, a first gear member, a synchronizing gear member, a second gear member, and a sliding gear member; a push spring; the switching assembly is used for controlling the sliding gear piece to be meshed with or separated from the synchronous gear piece and comprises a shifting fork, a switching shaft, a switching arm, a pushing torsion spring and a driving motor, one end of the switching arm is fixed on the switching shaft, and the other end of the switching arm is connected with the driving motor; two ends of the pushing torsion spring are respectively connected with the switching arm and the shell; the pushing torsion spring is used for continuously applying force to the switching arm, so that the shifting fork continuously applies force back to the synchronous gear piece to the sliding gear piece.

Description

Differential device and model vehicle

Technical Field

The utility model relates to a vehicle transmission technical field especially relates to a differential mechanism device and model car.

Background

The power of the engine of the vehicle is transmitted through the components such as the transmission, the transmission shaft and the like, and is finally transmitted to the drive axle which is the final assembly and the main components of which are the speed reducer and the differential mechanism, and then the drive axle is distributed to the half shafts left and right to drive wheels to rotate. The differential is generally composed of planetary gears, a planetary carrier, a side gear and the like. The power of the engine enters the differential mechanism through the transmission shaft to directly drive the planet wheel carrier, and then the planet wheel drives the left half shaft and the right half shaft to respectively drive the left wheel and the right wheel.

When the automobile runs straight, the rotating speeds of the left wheel, the right wheel and the planet carrier are equal and are in a balanced state, and the balanced state of the left wheel, the right wheel and the planet carrier is damaged when the automobile turns, so that the rotating speed of the inner side wheel is reduced, and the rotating speed of the outer side wheel is increased. The differential mechanism has the functions of transmitting power to the half shafts at two sides, allowing the half shafts at two sides to rotate at different rotating speeds, meeting the requirement that wheels at two sides run at different distances in a pure rolling mode as far as possible, and reducing the friction between tires and the ground. However, the differential mechanism has the disadvantage that when the vehicle encounters a bad road surface, such as sand or mud, the wheels at the other end of the differential mechanism lose power completely and are kept still as long as one wheel falls into a slip state. Therefore, when one driving wheel slips, the planet wheel carrier and the half shaft are locked into a whole, the differential mechanism loses the differential action, and the whole torque can be transferred to the driving wheel at the other side,

at present, the existing differential has a differential lock for opening or closing the differential, when the gear set of the differential is partially completely locked, the differential action of the differential is disabled, so that the wheels on both sides can obtain the same power; and differential lock on present differential mechanism usually directly makes a round trip to rotate and then makes the shift fork make a round trip to promote the switching dish through motor drive shift fork, and the motor needs to continue the circular telegram, makes the in-process of gear train part complete locking at the motor moreover because two tooth portions can appear and died and the condition of not meshing for motor and gear train receive the damage easily.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the utility model provides a differential mechanism device and model car.

In a first aspect, an embodiment of the present invention provides a differential device, which includes:

a housing;

a differential assembly located in the housing, the differential assembly including a main driving gear, a planetary gear set, a first gear, a synchronizing gear, a second gear and a sliding gear, the main driving gear meshing with the synchronizing gear, the synchronizing gear engaging with the planetary gear, the planetary gear set meshing with the first gear and the second gear, the sliding gear engaging with the second gear and moving along the axis of the second gear, the sliding gear rotating synchronously with the second gear;

a push spring within the housing for continuously applying a force to the sliding gear member toward the synchronizing gear member;

the switching assembly is used for controlling the sliding gear piece to be meshed with or separated from the synchronous gear piece and comprises a shifting fork, a switching shaft, a switching arm, a pushing torsion spring and a driving motor, the switching shaft penetrates through the shell and can rotate relative to the shell, the shifting fork is fixed on the switching shaft and abuts against the sliding gear piece, one end of the switching arm is fixed on the switching shaft, and the other end of the switching arm is connected with the driving motor; two ends of the pushing torsion spring are respectively connected with the switching arm and the shell; the pushing torsion spring is used for continuously applying force to the switching arm, so that the shifting fork continuously applies force back to the synchronous gear piece to the sliding gear piece.

According to the utility model discloses differential mechanism device has following technological effect at least: the force applied by the driving motor to the switching arm is opposite to the direction of the force applied by the pushing torsion spring to the switching arm, the force applied by the driving motor and the pushing torsion spring to the switching arm is converted into the force applied by the shifting fork to the sliding gear piece, and when the force applied by the shifting fork to the sliding gear piece is larger than the force applied by the pushing spring to the sliding gear piece, the sliding gear piece is separated from the synchronous gear piece; when the force of the shift fork to the sliding gear piece is smaller than the force of the pushing spring to the sliding gear piece, the sliding gear piece moves to be engaged with the synchronous gear piece.

According to some embodiments of the present invention, when the driving motor is stopped, a force applied to the sliding gear piece by the shift fork is greater than a force applied to the sliding gear piece by the push spring, and the sliding gear piece is separated from the synchronous gear piece; when driving motor opens, driving motor is right the part can be offset to the power of switching the arm the promotion torsional spring is right the power of switching the arm, so that it is right to promote the spring sliding gear spare power of exerting more than the shift fork is right sliding gear spare power of exerting, sliding gear spare move to with synchronous gear spare meshing.

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, both ends of the first shaft are respectively fixedly connected to the first inner tooth portion and the first outer tooth portion, 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.

According to some embodiments of the utility model, the second gear piece includes second internal tooth portion, second shaft and second external tooth portion, the both ends of second shaft respectively fixed connection in the second internal tooth portion with the second external tooth portion, the second internal tooth portion with the planetary gear set meshing, the second external tooth portion with the wheel meshing of model car, sliding gear piece cover is located on the second shaft, sliding gear piece can follow the axis of second shaft slides, sliding gear piece with the second shaft rotates in step.

According to some embodiments of the utility model, the sliding gear spare is including sliding internal tooth portion, slip drum and slip disc, the both ends difference fixed connection of slip drum in tooth portion with the slip disc in sliding, slide internal tooth portion the slip drum with the integrative moulding plastics of slip disc, slide internal tooth portion the slip drum with the slip disc all overlaps and locates on the secondary shaft, slide internal tooth portion with synchronous gear spare meshing or separation.

According to the utility model discloses a some embodiments, be equipped with the fixed disk on the second shaft, the fixed disk cover is established and is fixed in on the second shaft, the fixed disk is located the slip disc is kept away from one side of tooth portion in the slip, the promotion spring housing is located on the second shaft, the promotion spring is located the slip disc with between the fixed disk, the both ends of promotion spring respectively with the slip disc with the fixed disk is connected, the promotion spring is in compression state.

According to some embodiments of the invention, the shift fork is located between the sliding inner tooth portion and the sliding disc, the shift fork with the sliding disc is close to one side butt of the sliding inner tooth portion.

According to some embodiments of the utility model, the casing is equipped with the billet subassembly, the billet subassembly includes connecting seat and long billet, long billet wears to locate the connecting seat and can for the connecting seat slides, connecting seat fixed mounting is in the casing, the one end of long billet with driving motor connects, the other end of long billet with the switching arm is connected, driving motor can pass through long billet is right the switching arm exerts the force, driving motor is right the switching arm exert the force with it is right to promote the torsional spring the opposite direction of the force that the switching arm exerted.

In a second aspect, an embodiment of the present invention further provides a model car, including according to the present invention, the differential device according to the above first aspect of the present invention is provided.

According to the utility model discloses model car has following technological effect at least: when the differential is required to play a differential action, the driving motor is not started, so that the force of the shifting fork on the sliding gear piece is greater than the force of the pushing spring on the sliding gear piece, and the sliding gear piece is separated from the synchronous gear piece; when the differential does not play a differential role, the driving motor is started, so that the force of the shifting fork on the sliding gear piece is smaller than the force of the pushing spring on the sliding gear piece, and the sliding gear piece moves to be meshed with the synchronous gear piece.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a differential device according to some embodiments of the present invention;

FIG. 2 is a schematic view of a differential device according to some embodiments of the present invention from another angle;

fig. 3 is a front view of a differential device according to some embodiments of the present invention;

fig. 4 is a rear view of a differential device according to some embodiments of the present invention;

fig. 5 is a schematic view of a differential device with a hidden housing according to some embodiments of the present invention;

FIG. 6 is an exploded view of FIG. 5;

fig. 7 is a schematic structural diagram of a switching assembly according to some embodiments of the present invention.

Reference numbers:

a housing 100, a main driving gear member 110, a planetary gear set 120, a push spring 130, a synchronizing gear member 140, a steel bar assembly 150, a connecting seat 151, a long steel bar 152;

a first gear member 200, a first inner tooth portion 210, a first outer tooth portion 220, a first shaft 230, a first groove 231;

a second gear 300, a second inner tooth 310, a second outer tooth 320, a second shaft 330, a second groove 331, a fixing disk 332;

a sliding gear member 400, a sliding inner gear portion 410, a sliding cylinder 420, a sliding disk 430;

the switching assembly 500, the fork 510, the switching shaft 520, the switching arm 530, and the pushing torsion spring 540.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the directional descriptions, such as the directions or positional relationships indicated by upper, lower, front, rear, left, right, etc., are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but not for indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.

In the description of the present invention, if there are first and second descriptions for distinguishing technical features, they are not interpreted as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

The embodiments of the present invention will be further explained with reference to the drawings.

According to some embodiments of the present invention, referring to fig. 1 to 7, the differential device includes a housing 100, a differential assembly, a push spring 130, and a switching assembly 500; referring to fig. 5 to 6, a differential assembly is located in the housing 100, the differential assembly including a main driving gear member 110, a planetary gear set 120, a first gear member 200, a synchronizing gear member 140, a second gear member 300, and a sliding gear member 400, the main driving gear being located at the rear of the synchronizing gear member 140, the main driving gear being engaged with the synchronizing gear member 140, the planetary gear set 120 being located inside the synchronizing gear member 140 and engaged with the synchronizing gear member 140, the synchronizing gear member 140 being fitted over one end of the first gear member 200, the first gear member 200 being located at the left side of the planetary gear set 120, the second gear member 300 being located at the right side of the planetary gear set 120, the planetary gear set 120 being engaged with the first gear member 200 and the second gear member 300, respectively; when the main driving gear 110 rotates, the synchronizing gear 140 rotates along with the main driving gear 110, and the synchronizing gear 140 drives the planetary gear set 120 to rotate, the rotation of the planetary gear set 120 can respectively drive the first gear 200 and the second gear 300 to rotate, the first gear 200 and the second gear 300 can realize differential rotation, and the planetary gear differential principle is a conventional technical principle of those skilled in the art and is not described herein; the sliding gear part 400 is sleeved on the second gear part 300 and can move along the axial direction of the second gear part 300, the sliding gear part 400 can be engaged with or separated from the synchronizing gear part 140, the rotation of the sliding gear part 400 can drive the second gear part 300 to rotate, and the sliding gear part 400 and the second gear part 300 synchronously rotate; the push spring 130 is located in the housing 100, and the push spring 130 can continuously apply a force toward the timing gear member 140, i.e., a leftward force, to the sliding gear member 400; referring to fig. 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, not shown in the drawings, the switching shaft 520 is inserted into the interior of the casing 100 and can rotate with respect to the casing 100, the shift fork 510 is fixed to the switching shaft 520 and abuts against the sliding gear member 400, one end of the switching arm 530 is fixedly mounted to the switching shaft 520, 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, the other end of the pushing torsion spring 540 is connected to the casing 100, the pushing torsion spring 540 can continuously apply a force to the switching arm 530, so that the switching arm 530 and the switching shaft 520 continuously have a tendency to rotate, and the shift fork 510 fixed to the switching shaft 520 continuously applies a force to the sliding gear member 400, that is directed away from the synchronous gear member 140, that is directed to the right.

It should be noted that, when the motor is not started, the torsion force that pushes the torsion spring 540 to continuously apply to the switching arm 530 is converted into a rightward force that the shift fork 510 continuously applies to the sliding gear piece 400, and the magnitude of the force is F1; the pushing spring 130 continuously applies a leftward force to the sliding gear member 400, the magnitude of the force being F2, and F1 > F2:

when the driving motor is not started, the shift fork 510 can push the sliding gear member 400 to move rightward to a position separated from the synchronizing gear member 140 and make the sliding gear member 400 abut against the inner wall of the casing 100, at this time, the sliding gear member 400 remains stationary, and the differential device performs a differential function.

When the driving motor is started, the force applied by the driving motor on the switching arm 530 is opposite to the direction of the force applied by the torsion spring 540 on the switching arm 530, the force applied by the driving motor on the switching arm 530 is F3, and F3 is gradually increased; when F1 > F2+ F3, the sliding gear piece 400 remains stationary; when F3 is gradually increased to satisfy: f2+ F3 > F1, the sliding gear member 400 moves to the left until it engages the synchronizing gear member 140, at which time the differential does not act as a differential.

It should be noted that, when F2+ F3 > F1, the sliding movement to the left is performed until the sliding movement is engaged with the synchronizing gear member 140, and F3 is not gradually increased, and then F3 < F1.

It can be understood that when the driving motor is not started, the shifting fork 510 continuously applies a rightward force to the sliding gear 400 as F1, and when the driving motor is started, the shifting fork 510 continuously applies a rightward force to the sliding gear 400 as F1 minus F3; the fork 510 always applies a force to the sliding gear member 400 rightward whether the driving motor is activated or not.

It can be further understood that the present embodiment avoids the situation that the shifting fork 510 needs to be rotated back and forth to change the contact point with the sliding gear piece 400, and then the sliding gear piece 400 is pushed leftward or the sliding gear piece 400 is pushed rightward, so that the shifting fork 510 is easily damaged, and meanwhile, the power requirement on the driving motor is also high, which increases the energy consumption and the cost; the embodiment does not need the shifting fork 510 to rotate back and forth to further push the sliding gear piece 400 to move, the power requirement on the driving motor is not large, and the energy consumption and the cost are reduced.

It can also be understood that the pushing spring 130 continuously applies a leftward force to the sliding gear member 400, and when the sliding gear member 400 moves leftward to engage with the synchronizing gear member 140 after the motor is started, sometimes the head of the tooth portion at the left end of the sliding gear member 400 and the head of the tooth portion at the right end of the synchronizing gear member 140 are pushed against each other, and the engagement cannot be completed, and then the engagement can be completed until the synchronizing gear member 140 rotates a certain angle; if a driving motor with a large power is directly used to drive the shift fork 510 to push the sliding gear member 400 to move leftward and engage with the synchronizing gear member 140, the driving motor, the sliding gear member 400 and the synchronizing gear member 140 are damaged when the above-mentioned conditions are met, and the wear of the parts is accelerated. The present embodiment employs the pushing spring 130 to apply a leftward force to the sliding gear member 400, and the driving motor only acts to offset a portion of the force applied to the switching arm 530 by the pushing torsion spring 540, so as to indirectly control the movement of the sliding gear member 400, which can greatly reduce the power required by the driving motor and reduce the wear rate of the parts.

According to some embodiments of the present invention, referring to fig. 5 and 6, the first gear member 200 includes a first inner tooth portion 210, a first shaft 230 and a first outer tooth portion 220, the right end of the first shaft 230 is fixedly connected to the first inner tooth portion 210, the left end of the first shaft 230 is fixedly connected to the first outer tooth portion 220, the first inner tooth portion 210 is engaged with the planetary gear set 120, the first outer tooth portion 220 is used for engaging with a wheel of a model car, the synchronizing gear member 140 is sleeved on the first shaft 230 and wraps the first inner tooth portion 210, and the synchronizing gear member 140 can rotate relative to the first shaft 230; the rotation of the main driving gear 110 can drive the synchronous gear 140 to rotate, so as to drive the planetary gear set 120 to rotate, and the rotation of the planetary gear set 120 can drive the first inner tooth portion 210 to rotate, so as to drive the first shaft 230 and the first outer tooth portion 220 to rotate, and the rotation of the first outer tooth portion 220 can drive the wheel connected with the first outer tooth portion 220 to rotate.

According to some embodiments of the present invention, referring to fig. 5 and 6, the second gear 300 includes a second inner tooth 310, a second shaft 330 and a second outer tooth 320, the left end of the second shaft 330 is fixedly connected to the second inner tooth 310, the right end of the second shaft 330 is fixedly connected to the second outer tooth 320, the second inner tooth 310 is engaged with the planetary gear set 120, the second outer tooth 320 is engaged with the wheel of the model car, a second groove 331 extending along the axial direction of the second shaft 330 is provided on the second shaft 330, the sliding gear 400 is sleeved on the second shaft 330 and the sliding gear 400 abuts against the second groove 331, the sliding gear 400 can slide along the axial direction of the second shaft 330, the sliding gear 400 rotates synchronously with the second shaft 330, it can be understood that, when the sliding gear 400 is sleeved on the second shaft 330, because the sliding gear 400 is partially located in the second groove 331 and abuts against the second groove 331, when the sliding gear 400 rotates, the sliding gear 400 abuts against the outer arc walls of the second groove 331 and the second shaft 330 at the same time, so that the rotation of the sliding gear 400 can drive the second shaft 330 to rotate synchronously.

It should be noted that the first shaft 230 is provided with the first groove 231, i.e. the first shaft 230 and the second shaft 330 may be replaced with each other.

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

According to some embodiments of the present invention, referring to fig. 5 and 6, the sliding gear 400 includes a sliding inner tooth portion 410, a sliding cylinder 420 and a sliding disk 430, the left end of the sliding cylinder 420 is fixedly connected to the sliding inner tooth portion 410, the right end of the sliding cylinder 420 is fixedly connected to the sliding disk 430, the sliding inner tooth portion 410, the sliding cylinder 420 and the sliding disk 430 are integrally formed, the sliding inner tooth portion 410, the sliding cylinder 420 and the sliding disk 430 are all sleeved on the second shaft 330, and the sliding inner tooth portion 410 is engaged with or separated from the synchronizing gear 140.

According to some embodiments of the present invention, referring to fig. 5 and 6, be equipped with fixed disk 332 on the second shaft 330, fixed disk 332 cover is established and is fixed in on the second shaft 330, fixed disk 332 is located the one side that slip internal tooth portion 410 was kept away from to slip disc 430, fixed disk 332 is located the right side of slip disc 430 promptly, push spring 130 cover is located on the second shaft 330, push spring 130 is located between slip disc 430 and fixed disk 332, push spring 130's both ends are connected with slip disc 430 and fixed disk 332 respectively, push spring 130 is in compression state, make push spring 130 continuously exert power left to slip disc 430.

According to some embodiments of the present invention, referring to fig. 5 to 7, the shift fork 510 is located between the sliding inner tooth portion 410 and the sliding disk 430, and the shift fork 510 abuts against one side of the sliding disk 430 close to the sliding inner tooth portion 410, that is, the shift fork 510 abuts against the left side of the sliding disk 430, and the pulling and inserting continuous and smooth moving disk 430 applies a force to the right.

According to some embodiments of the utility model, refer to fig. 2, fig. 4, fig. 5 and fig. 6, the rear side of casing 100 is equipped with billet subassembly 150, billet subassembly 150 includes connecting seat 151 and long billet 152, long billet 152 wears to locate connecting seat 151 and can slide for connecting seat 151, connecting seat 151 fixed mounting is on casing 100, the one end and the driving motor of long billet 152 are connected, the other end and the switching arm 530 of long billet 152 are connected, driving motor can exert force to switching arm 530 through long billet 152, driving motor exerts force to switching arm 530 with promote the opposite direction of the force that torsional spring 540 exerted to switching arm 530.

It will be appreciated that the long steel bar 152 is a cylindrical long thin bar, and the connection of the long steel bar 152 to the switch arm 530 requires the long steel bar 152 to be bent off and inserted and tied to the switch arm 530.

In the description of the present specification, reference to the term "some embodiments" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (9)

1. A differential device for use with a model vehicle, comprising:

a housing (100);

a differential assembly located in the housing (100), the differential assembly including a main driving gear (110), a planetary gear set (120), a first gear (200), a synchronizing gear (140), a second gear (300) and a sliding gear (400), the main driving gear (110) meshing with the synchronizing gear (140), the synchronizing gear (140) being sleeved on the first gear (200) and meshing with the planetary gear set (120), the planetary gear set (120) meshing with the first gear (200) and the second gear (300) respectively, the sliding gear (400) sleeved on the second gear (300) and capable of moving along an axial direction of the second gear (300), the sliding gear (400) rotating synchronously with the second gear (300);

a push spring (130) located within the housing (100), the push spring (130) for continuously applying a force to the sliding gear member (400) towards the synchronizing gear member (140);

a switching assembly (500) for controlling the sliding gear member (400) to be engaged with or disengaged from the synchronizing gear member (140), wherein the switching assembly (500) comprises 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) penetrates 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 (400), one end of the switching arm (530) is fixed on the switching shaft (520), and the other end of the switching arm (530) is connected with the driving motor; both 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 for continuously applying force to the switching arm (530), so that the shifting fork (510) continuously applies force to the sliding gear piece (400) and the force is opposite to the synchronous gear piece (140).

2. The differential device according to claim 1, characterized in that when the drive motor is stopped, a force applied to the sliding gear member (400) by the shift fork (510) is larger than a force applied to the sliding gear member (400) by the urging spring (130), and the sliding gear member (400) is separated from the synchronizing gear member (140); when the driving motor is started, the force applied by the driving motor to the switching arm (530) can offset part of the force applied by the pushing torsion spring (540) to the switching arm (530), so that the force applied by the pushing spring (130) to the sliding gear piece (400) is greater than the force applied by the shifting fork (510) to the sliding gear piece (400), and the sliding gear piece (400) moves to be meshed with the synchronous gear piece (140).

3. The differential device according to claim 1, wherein the first gear member (200) includes a first inner tooth portion (210), a first shaft (230), and a first outer tooth portion (220), both 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 a wheel of the model car.

4. The differential device according to claim 1, wherein the second gear member (300) includes a second inner tooth portion (310), a second shaft (330) and a second outer tooth portion (320), both ends of the second shaft (330) are respectively fixedly connected to the second inner tooth portion (310) and the second outer tooth portion (320), the second inner tooth portion (310) is engaged with the planetary gear set (120), the second outer tooth portion (320) is engaged with a wheel of the model car, the sliding gear member (400) is sleeved on the second shaft (330), the sliding gear member (400) can slide along an axis of the second shaft (330), and the sliding gear member (400) and the second shaft (330) rotate synchronously.

5. The differential device according to claim 4, characterized in that the sliding gear member (400) includes a sliding inner tooth portion (410), a sliding cylinder (420) and a sliding disk (430), both ends of the sliding cylinder (420) are fixedly connected to the sliding inner tooth portion (410) and the sliding disk (430), respectively, the sliding inner tooth portion (410), the sliding cylinder (420) and the sliding disk (430) are integrally injection-molded, the sliding inner tooth portion (410), the sliding cylinder (420) and the sliding disk (430) are all sleeved on the second shaft (330), and the sliding inner tooth portion (410) is engaged with or disengaged from the synchronizing gear member (140).

6. The differential device according to claim 5, characterized in that a fixed disk (332) is provided on the second shaft (330), the fixed disk (332) is fitted over and fixed to the second shaft (330), the fixed disk (332) is located on a side of the sliding disk (430) away from the sliding inner tooth portion (410), the push spring (130) is fitted over the second shaft (330), the push spring (130) is located between the sliding disk (430) and the fixed disk (332), two ends of the push spring (130) are connected to the sliding disk (430) and the fixed disk (332), respectively, 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 teeth (410) and the sliding disk (430), the shift fork (510) abutting with a side of the sliding disk (430) near the sliding inner teeth (410).

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

9. A model vehicle characterized by comprising the differential device according to any one of claims 1 to 8.

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