Disconnectable transmission device and automobile

Abstract

The utility model provides a disconnectable transmission device and an automobile, the disconnectable transmission device comprises a differential mechanism, an output hub and a disconnector, the differential mechanism comprises an output shaft coaxial with the output hub, and the disconnector comprises a connecting shaft and a disconnecting mechanism which are arranged on the output hub. Wherein the connecting shaft is fixed relative to the output hub in the circumferential direction of the output hub, can move in the axial direction of the output hub and is detachably connected with the output shaft, and the disconnecting mechanism comprises a control part connected with the connecting shaft and is used for controlling the control part to do telescopic movement in the axial direction of the output hub. Therefore, the connecting shaft is connected with and separated from the output shaft. The disconnection position of the power transmission path between the differential mechanism and the wheels is selected between the output shaft and the connecting shaft, power transmission between the differential mechanism and the wheels is disconnected, and compared with the scheme that the differential mechanism is internally disconnected, the differential mechanism has the cost advantage, a power system of an automobile is easier to arrange and assemble, and the service life is prolonged. The universality improvement does not need adaptive improvement aiming at the differential mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to a disconnectable transmission device and an automobile. Background Art

[0002] At present, the power system of electric vehicles uses permanent magnet synchronous motors as the driving source. Under some driving conditions, such as four-wheel drive mode, the motor transmits torque to the wheels through the differential. When the driving conditions change, it is necessary to disconnect the power transmission between the differential and the wheels to avoid the wheels from dragging the motor through the differential, thereby preventing the motor from being subjected to drag torque to generate back electromotive force. Utility Model Content

[0003] In view of this, the utility model provides a disconnectable transmission device and a vehicle which can disconnect and restore the power transmission between the differential and the wheels to meet the driving needs.

[0004] The utility model provides a disconnectable transmission device comprising a differential, an output hub and a disconnector, wherein the differential comprises an output shaft coaxial with the output hub, the disconnector comprises a connecting shaft and a disconnecting mechanism arranged on the output hub, wherein the connecting shaft is configured to be fixed relative to the output hub along the circumferential direction of the output hub, movable along the axial direction of the output hub and detachably connected to the output shaft, the disconnecting mechanism comprises a control member connected to the connecting shaft, and the disconnecting mechanism is used to control the control member to perform telescopic movement along the axial position of the output hub to drive the connecting shaft to move so as to connect and disconnect the output shaft.

[0005] The disconnectable transmission device of the utility model has the following beneficial effects:

[0006] The utility model selects the disconnection position of the power transmission path between the differential and the wheels between the output shaft and the connecting shaft, that is, the power transmission between the differential and the wheels is disconnected. Compared with the existing solution of disconnection inside the differential, it has a cost advantage, makes the layout and assembly of the power system of the automobile easier, and improves the versatility without the need for adaptive improvement of the differential.

[0007] In some embodiments, the control member includes a first pusher and a second pusher disposed on the output hub, the first pusher abuts and is used to push the end of the connecting shaft toward the output shaft, and the second pusher abuts and is used to push the end of the connecting shaft away from the output shaft.

[0008] With such arrangement, the first pusher and the second pusher cooperate at both ends of the connecting shaft to make the connecting shaft reciprocate in the axial direction of the output hub, so that the connecting shaft and the output shaft can be disconnected or connected under the control of the disconnection mechanism.

[0009] In some embodiments, the connecting shaft includes a sliding sleeve sleeved on the output hub, the sliding sleeve is key-connected to the output hub, and one end of the sliding sleeve close to the output shaft is used to contact the output shaft.

[0010] With such arrangement, the sliding sleeve and the output hub are relatively fixed in the circumferential direction of the output hub, and as the sliding sleeve moves along the axial direction of the output hub, the end of the sliding sleeve close to the output shaft can be connected to and separated from the output shaft.

[0011] In some embodiments, the connecting shaft further comprises an end cover fixedly mounted on an end of the sliding sleeve relatively away from the output shaft, the first pusher abuts against an end of the end cover relatively close to the output shaft, and the second pusher abuts against an end of the end cover relatively away from the output shaft.

[0012] With such arrangement, the first pusher and the second pusher cooperate at both ends of the end cover to make the connecting shaft reciprocate in the axial direction of the output hub, and the connection between the sliding sleeve and the output hub, and the connection between the sliding sleeve and the output shaft are not disturbed.

[0013] In some embodiments, the output hub includes a stop shoulder, the first pusher includes a reset elastic member, one end of the reset elastic member is connected to the stop shoulder, and the other end abuts against the end of the connecting shaft toward the output shaft.

[0014] With such arrangement, the reset elastic member releases elastic potential energy through elastic deformation to drive the connecting shaft away from and disengage from the output shaft, so that the disconnectable transmission device is usually in a disconnected state. When the four-wheel drive mode needs to be started, the force of the second pusher acting on the connecting shaft overcomes the elastic force of the reset elastic member, thereby restoring the power transmission path between the differential and the wheels, matching the daily driving conditions of the car.

[0015] In some embodiments, there are multiple reset elastic members, and the multiple reset elastic members are evenly distributed along the circumference of the output hub. The connecting shaft sleeve is arranged on the outer circumference of the output hub and abuts against the multiple reset elastic members.

[0016] With such an arrangement, a plurality of reset elastic members can accurately apply force to the connecting shaft along the axial direction of the output hub, so that the connecting shaft can accurately move along the axial direction of the output hub to disengage from the output shaft, and the disconnection action between the connecting shaft and the output shaft is faster, thereby reducing the loss of the vehicle power system.

[0017] In some embodiments, the disconnect mechanism further comprises an excitation coil for generating an induced magnetic field, and the second pusher comprises a magnetic push block, which is used to respond to changes in the induced magnetic field and displace axially along the output hub, thereby abutting and disengaging the end of the connecting shaft away from the output shaft.

[0018] With this arrangement, the second pusher is driven by the principle of electromagnetic induction to abut and push the connecting shaft to move. The excitation coil can provide sufficient thrust for the second pusher to ensure that the connecting shaft can smoothly approach and quickly connect to the output shaft, making the structure of the disconnectable transmission device simple.

[0019] In some embodiments, the disconnect mechanism also includes a wire rack arranged on the output hub, the excitation coil is fixed to the wire rack, the wire rack is provided with a slide groove, the magnetic push block and the slide groove are slidably matched along the axial direction of the output hub, and the magnetic push block is used to respond to changes in the induced magnetic field to slide in and out of the slide groove.

[0020] With such arrangement, when the excitation coil excites an induced magnetic field, the magnetic push block can move precisely along the axial direction of the output hub under the guidance of the groove wall, so that the magnetic push block can precisely push the connecting shaft to move along the axial direction of the output hub to connect the output shaft. The connection efficiency between the connecting shaft and the output shaft is greatly improved, reducing the delay and loss of the vehicle power system.

[0021] In some embodiments, the excitation coil is provided with a magnetic push block; and / or,

[0022] The slide slot opens toward the connecting shaft and surrounds the output hub. The magnetic push block is a magnetic slip ring adapted to the slide slot. One end of the magnetic slip ring extends out of the opening of the slide slot to abut against the output shaft.

[0023] With such arrangement, the magnetic push block can accurately apply thrust to the connecting shaft along the axial direction of the output hub, and the end of the connecting shaft away from the output shaft is subjected to a more balanced and stable thrust, thereby helping to make the connecting shaft accurately approach the output shaft along the axial direction of the output hub, thereby improving the connection efficiency between the connecting shaft and the output shaft, and alleviating and improving the hysteresis and loss of the automobile power system.

[0024] In some embodiments, the output shaft is fixedly provided with output end face teeth, and the disconnector further comprises input end face teeth provided at the end of the connecting shaft, and the output end face teeth are adapted to the input end face teeth.

[0025] With such an arrangement, the output shaft and the connecting shaft can be quickly connected in a short time to establish a power transmission path from the differential to the wheels, and can also be quickly separated in a short time to disconnect the power transmission path from the differential to the wheels.

[0026] The automobile provided by the utility model comprises a disconnectable transmission device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A partial structural cross-sectional view of a disconnectable transmission device according to an embodiment of the utility model;

[0028] Figure 2 A cross-sectional view of a disconnectable transmission device according to an embodiment of the utility model when disconnected;

[0029] Figure 3 A cross-sectional view of a disconnectable transmission device according to an embodiment of the utility model when connected;

[0030] Figure 4 A three-dimensional diagram of a disconnectable transmission device according to an embodiment of the utility model when disconnected;

[0031] Figure 5 A three-dimensional diagram of a disconnectable transmission device according to an embodiment of the utility model when connected;

[0032] Figure 6 A cross-sectional view of a disconnectable transmission device according to an embodiment of the utility model;

[0033] Figure 7 It is a cross-sectional view of a disconnectable transmission device according to another embodiment of the present invention.

[0034] Figure numerals: 10, differential; 11, output shaft; 12, output end face gear; 20, output hub; 21, external spline; 22, stop shoulder; 23, first shaft section; 24, second shaft section; 30, connecting shaft; 31, sliding sleeve; 311, internal spline; 312, input end face gear; 32, end cover; 40, disconnect mechanism; 41, first push member; 411, reset elastic member; 42, second push member; 421, magnetic push block; 43, excitation coil; 44, wire rack; 441, slide groove; 51, first bearing; 52, second bearing; 60, motor shaft; 70, second output shaft; 80, input shaft; 90, intermediate shaft. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0037] The utility model provides a disconnectable transmission device used as a vehicle power system, and provides a vehicle including the disconnectable transmission device. The function of the disconnectable transmission device is to disconnect the power transmission path from the differential 10 to the wheel according to driving needs, and to restore the power transmission path from the differential 10 to the wheel according to driving needs. For example, when the vehicle is in a four-wheel drive mode, the disconnectable transmission device is in a connected state, and the differential 10 can transmit torque to the wheel. When it is necessary to disconnect the differential 10 from the wheel to avoid the wheel from generating a reverse drag effect on the vehicle motor through the differential 10, the disconnectable transmission device is in a disconnected state, thereby preventing the motor from generating a reverse electromotive force due to the drag torque of the wheel.

[0038] See also Figure 1 The disconnectable transmission device of the utility model includes a differential 10 and an output hub 20. The differential 10 can obtain power from the automobile motor. The differential 10 includes an output shaft 11. The output shaft 11 extends out of the differential 10 housing and serves as the power output end of the differential 10. The output hub 20 is coaxially arranged with the output shaft 11. When the disconnectable transmission device is in a connected state, the output hub 20 can rotate with the output shaft 11 at an equal speed. When the disconnectable transmission device is in a disconnected state, the output hub 20 can rotate relative to the output shaft 11, and of course it can also be stationary relative to the output shaft 11. The end of the output hub 20 relatively far away from the output shaft 11 is used to connect the wheel.

[0039] See also Figure 1 , see also Figure 2-3 , Figure 4-5 The disconnectable transmission device further includes a disconnector, which is used to switch the disconnectable transmission device between a connected state and a disconnected state, and the disconnector includes a connecting shaft 30 and a disconnection mechanism disposed on the output hub 20. In the circumferential orientation of the output hub 20, the connecting shaft 30 is fixedly disposed relative to the output hub 20, and in the axial orientation of the output hub 20, the connecting shaft 30 is movably disposed relative to the output hub 20. As the connecting shaft 30 moves along the axial direction of the output hub 20, the connecting shaft 30 can approach and connect to the output shaft 11, and can also move away from the output shaft 11 to be separated from the output shaft 11. The disconnection mechanism 40 includes a control member connected to the connecting shaft 30, and the control member can be telescopically movable along the axial direction of the output hub 20 under the control of the disconnection mechanism 40. As the control member moves along the telescopic direction, the connecting shaft 30 is driven by the control member to move along the axial direction of the output hub 20.

[0040] In some embodiments, the output hub 20 includes a first shaft segment 23 and a second shaft segment 24 that are coaxially fixedly connected, and the connecting shaft 30 is movably disposed on the first shaft segment 23 along the axial direction of the output hub 20. The control member includes a first pushing member 41 disposed on the first shaft segment 23, and also includes a second pushing member 42 disposed on the second shaft segment 24. The first pushing member 41 abuts against the end of the connecting shaft 30 facing the output shaft 11, and can extend along the axial direction of the output hub 20 to push the connecting shaft 30 away from the output shaft 11. The second pushing member 42 abuts against the end of the connecting shaft 30 away from the output shaft 11, and can extend along the axial direction of the output hub 20 in a direction close to the output shaft 11 to push the connecting shaft 30 to move close to the output shaft 11.

[0041] Specifically, the connecting shaft 30 includes a sliding sleeve 31 sleeved on the first shaft section 23, and also includes an end cover 32 fixedly connected to one end of the sliding sleeve 31 relatively far from the output shaft 11. The output hub 20 also includes an external spline 21 arranged on the outer peripheral side of the first shaft section 23. The inner peripheral wall of the sliding sleeve 31 is provided with an internal spline 311 adapted to the external spline 21. The sliding sleeve 31 and the first shaft section 23 are connected through the external spline 21 and the internal spline 311. The keyway of the external spline 21 and the keyway of the internal spline 311 both extend along the axial straight line of the output hub 20, thereby allowing the sliding sleeve 31 and the first shaft section 23 to slide relative to each other along the axial direction of the output hub 20. The end of the sliding sleeve 31 relatively close to the output shaft 11 is used to contact the output shaft 11. The first pusher 41 abuts against the end of the end cover 32 close to the output shaft 11, and the second pusher 42 abuts against the end of the end cover 32 away from the output shaft 11.

[0042] Optionally, see Figure 1 , Figure 4-5 The outer peripheral wall of the output shaft 11 is fixedly provided with an annular flange protruding radially outward along the output shaft 11, and the end of the annular flange facing the connecting shaft 30 is provided with an output end face tooth 12, and the end of the sliding sleeve 31 relatively close to the output shaft 11 is provided with an input end face tooth 312, and the output end face tooth 12 is adapted to the input end face tooth 312. As the connecting shaft 30 approaches the output shaft 11 along the axial direction of the output hub 20, the input end face teeth 312 and the output end face teeth 12 gradually approach and finally form a meshing connection, so that the disconnectable transmission device is switched to a connected state. When the input end face teeth 312 are meshed with the output end face teeth 12, the connecting shaft 30 can rotate at the same speed as the output shaft 11; as the connecting shaft 30 moves away from the output shaft 11 along the axial direction of the output hub 20, the input end face teeth 312 are separated from the output end face teeth 12, so that the disconnectable transmission device is switched to a disconnected state. After the disconnectable transmission device is disconnected, the input end face teeth 312 withdraw from the tooth grooves of the output end face teeth 12, and the output end face teeth 12 withdraw from the tooth grooves of the input end face teeth 312.

[0043] As mentioned above, the connecting shaft 30 is connected to the first shaft section 23 of the output hub 20 through the sliding sleeve 31 and the internal and external splines 21, thereby realizing that the connecting shaft 30 and the output hub 20 are relatively fixed along the circumferential orientation of the output hub 20. After the disconnectable transmission device is switched to the connected state, the output hub 20 can rotate at the same speed following the connecting shaft 30, so that the output shaft 11, the connecting shaft 30 and the output hub 20 are relatively fixed in the circumferential orientation of the output hub 20 and can rotate at the same speed. In other embodiments, the sliding sleeve 31 and the first shaft section 23 can also be connected in other ways, for example, the internal and external splines 21 can be replaced with matching flat keys and flat key grooves.

[0044] Optionally, see Figure 1 to Figure 5 The output hub 20 also includes a stop shoulder 22 protruding from the outer peripheral wall of the first shaft section 23, the external spline 21 is located on the outer peripheral side of the stop shoulder 22, the external spline 21 and the first shaft section 23 are connected through the stop shoulder 22, the end of the stop shoulder 22 away from the output shaft 11 is arranged facing the end cover 32, the first pusher 41 includes a reset elastic member 411 with elastic deformation ability, one end of the reset elastic member 411 is connected to the end of the stop shoulder 22 away from the output shaft 11, and the other end of the reset elastic member 411 abuts against one end of the end cover 32 facing the output shaft 11 and the stop shoulder 22. When the disconnectable transmission device is about to switch to the connected state, the disconnecting mechanism 40 controls the second pushing member 42 to apply a thrust to the end of the end cover 32 away from the output shaft 11 and the stop shoulder 22, and overcomes the elastic force of the reset elastic member 411, so that the connecting shaft 30 is close to the output shaft 11 until the output end face tooth 12 and the input end face tooth 312 are docked and meshed; when the disconnectable transmission device switches from the connected state to the disconnected state, the second pushing member 42 stops pushing the end cover 32, the reset elastic member 411 elastically stretches and releases elastic potential energy, and the end of the end cover 32 toward the output shaft 11 and the stop shoulder 22 is acted upon by the thrust of the reset elastic member 411, so that the connecting shaft 30 is moved away from the output shaft 11, and finally the output end face tooth 12 and the input end face tooth 312 are separated.

[0045] Optionally, the stop shoulder 22 extends along the circumference of the first shaft section 23 to form a closed-loop convex structure, the end cover 32 extends along the circumference of the output hub 20 and sleeves the output hub 20, the number of the reset elastic member 411 can be multiple, each reset elastic member 411 can be a cylindrical coil spring or a tower spring, the axis of the cylindrical coil spring or the axis of the tower spring are parallel to the axial direction of the output hub 20, and the multiple reset elastic members 411 are evenly distributed along the circumference of the output hub 20. In this way, the direction of the combined force of the thrusts of the multiple reset elastic members 411 acting on the connecting shaft 30 is parallel to the axial direction of the output hub 20, the connecting shaft 30 can slide smoothly along the axial direction of the output hub 20, and the input end face teeth 312 and the output end face teeth 12 can be quickly separated under the thrust of the reset elastic member 411, thereby improving the efficiency of switching the disconnectable transmission device from the connected state to the disconnected state. The disconnectable transmission device can therefore be quickly switched from a connected state to a disconnected state, and the power transmission path from the differential 10 to the wheels can be disconnected more quickly without causing hysteresis.

[0046] Optionally, a transition fit is formed between the first shaft section 23 of the output hub 20 and the end cover 32. Such a configuration can not only ensure the smooth axial displacement of the connecting shaft 30 along the output hub 20, but also ensure the coaxiality of the connecting shaft 30 and the output hub 20, and further ensure the coaxiality between the input end face teeth 312 and the output end face teeth 12, so that the input end face teeth 312 and the output end face teeth 12 can be smoothly docked, engaged or separated, and the key connection between the sliding sleeve 31 and the first shaft section 23 will not be affected by the coaxiality error between the connecting shaft 30 and the output hub 20.

[0047] It is worth mentioning that the use of multiple cylindrical coil springs or multiple tower springs as the reset elastic member 411 can achieve a fast and sensitive response of the connecting shaft 30 to the extension activity of the first pusher 41. The extension activity of the first pusher 41 is the elastic extension deformation of the reset elastic member 411. The elastic extension deformation of the reset elastic member 411 is equivalent to the displacement of the connecting shaft 30 axially away from the output shaft 11 along the output hub 20, which can ensure that the connecting shaft 30 and the output shaft 11 are efficiently and completely disconnected, so that when the disconnectable transmission device is switched to the disconnected state, the power transmission path from the differential 10 to the wheel is completely disconnected.

[0048] In some embodiments, the disconnect mechanism 40 also includes a wire rack 44 and an excitation coil 43. The wire rack 44 is fixedly mounted on the second shaft segment 24 of the output hub 20. The excitation coil 43 is fixedly mounted on the wire rack 44. The excitation coil 43 can excite an induced magnetic field after being energized. The second pusher 42 includes a magnetic push block 421. The magnetic push block 421 and the wire rack 44 form a sliding fit for relative movement along the axial direction of the output hub 20. When the excitation coil 43 is energized, the magnetic push block 421 is subjected to electromagnetic force under the action of the induced magnetic field excited by the excitation coil 43, and the electromagnetic force drives the magnetic push block 421 to slide relative to the wire frame 44, so that the magnetic push block 421 moves along the axial direction of the output hub 20 and approaches the output shaft 11. In the process of the magnetic push block 421 approaching the output shaft 11 along the axial direction of the output hub 20, the magnetic push block 421 applies a thrust to the end of the end cover 32 away from the output shaft 11 and the stop shoulder 22, so that the connecting shaft 30 is approached to the output shaft 11 along the axial direction of the output hub 20 under the thrust of the magnetic push block 421 until the input end face tooth 312 is butted and meshed with the output end face tooth 12. When the current in the excitation coil 43 decreases or stops being energized, the strength of the induced magnetic field weakens or disappears, and the electromagnetic force exerted on the magnetic push block 421 decreases or disappears. The thrust of the magnetic push block 421 on the connecting shaft 30 is not sufficient to overcome the thrust of the reset elastic member 411 on the connecting shaft 30. Finally, the reset elastic member 411 pushes the connecting shaft 30 axially away from the output shaft 11 of the output hub 20, thereby separating the input end face tooth 312 from the output end face tooth 12. The magnetic push block 421 is also pushed as the connecting shaft 30 moves away from the output shaft 11 and slides relative to the wire rack 44.

[0049] Specifically, the wire frame 44 is sleeved on the outer peripheral side of the second shaft segment 24 and fixedly matched with the second shaft segment 24, and the excitation coil 43 surrounds the second shaft segment 24 along the axial direction of the second shaft segment 24. After the excitation coil 43 is energized, the N pole and S pole of the induced magnetic field excited are arranged along the axial direction of the output hub 20, and the N pole and S pole of the magnetic push block 421 are arranged along the axial direction of the output hub 20. The induced magnetic field excited by the excitation coil 43 magnetically repels the magnetic push block 421, and the electromagnetic force acting on the magnetic push block 421 causes the magnetic push block 421 to obtain an acceleration along the axial direction of the output hub 20 close to the output shaft 11. The wire rack 44 is provided with a slide groove 441, the opening of the slide groove 441 is formed at one end of the wire rack 44 facing the output shaft 11 and the connecting shaft 30, the magnetic push block 421 and the groove wall of the slide groove 441 are slidably adapted along the axial direction of the output hub 20, the magnetic push block 421 extends from the opening of the slide groove 441 and abuts against the end of the end cover 32 away from the output shaft 11 and the stop shoulder 22, after the excitation coil 43 is energized, the part of the magnetic push block 421 extending out of the opening of the slide groove 441 is extended, thereby the magnetic push block 421 pushes the connecting shaft 30 along the axial direction of the output hub 20 close to the output shaft 11.

[0050] The groove wall of the slide groove 441 can guide the magnetic push block 421 to move precisely along the axial direction of the output hub 20, so that the magnetic push block 421 can accurately apply a thrust in a direction parallel to the axial direction of the output hub 20 to the connecting shaft 30. Therefore, the connecting shaft 30 can respond quickly to the thrust of the magnetic push block 421 and move precisely along the axial direction of the output hub 20, so that the connecting shaft 30 and the output shaft 11 can be quickly connected in a very short time. Figure 1 to Figure 5 The slide groove 441 is an annular groove extending along the circumference of the output hub 20 and surrounding the output hub 20. The opening of the slide groove 441 faces the connecting shaft 30. The excitation coil 43 is sleeved with a magnetic push block 421. The magnetic push block 421 is a magnetic slip ring matching the slide groove 441. Under the action of electromagnetic force, one end of the magnetic slip ring extends from the opening of the slide groove 441 and protrudes from the end of the wire frame 44 facing the output shaft 11, thereby abutting against the end cover 32. In this way, the thrust of the magnetic slip ring on the connecting shaft 30 is more balanced, and the thrust action direction is parallel to the circumference of the output hub 20. Therefore, the connecting shaft 30 can be accurately displaced along the axial direction of the output hub 20 to approach the output shaft 11, and the disconnectable transmission device can be quickly switched from the disconnected state to the connected state, and the power transmission path from the differential 10 to the wheel is established more quickly without hysteresis.

[0051] When the excitation coil 43 is powered off, the electromagnetic force acting on the magnetic slip ring disappears. At this time, the thrust of the reset elastic member 411 on the end cover 32 causes the connecting shaft 30 to push the magnetic slip ring out of the opening of the slide groove 441. Under the push of the connecting shaft 30, the magnetic slip ring moves axially away from the output shaft 11 along the output hub 20, and finally the magnetic slip ring retracts into the slide groove 441. The reset elastic member 411 undergoes telescopic deformation along the axial direction of the output hub 20, and the magnetic push block 421 extends out and retracts into the slide groove 441 along the axial direction of the output hub 20. Therefore, when the reset elastic member 411 elastically stretches, the elastic stretching amount of the reset elastic member 411, the displacement amount of the connecting shaft 30 along the axial direction of the output hub 20, and the retraction displacement amount of the magnetic push block 421 into the slide groove 441 are equal. When the excitation coil 43 is energized, the extension displacement amount of the magnetic push block 421 extending outward from the slide groove 441, the displacement amount of the connecting shaft 30 along the axial direction of the output hub 20, and the elastic contraction amount of the reset elastic member 411 are equal. The disconnectable transmission device has high switching efficiency between the connected state and the disconnected state. Only a small electromagnetic force is required for the magnetic push block 421 to push the connecting shaft 30 to move, and only a small elastic force is required for the reset elastic member 411 to push the connecting shaft 30 to move.

[0052] See also Figure 1 to Figure 5The disconnectable transmission device also includes a first bearing 51 and a second bearing 52. The inner ring of the first bearing 51 is sleeved with the output shaft 11 and fixedly matched with the output shaft 11. The outer ring of the first bearing 51 is sleeved with the first shaft section 23 of the output hub 20 and fixedly matched with the first shaft section 23. The arrangement of the first bearing 51 further ensures the coaxiality between the output shaft 11 and the output hub 20; the inner ring of the second bearing 52 is sleeved with the second shaft section 24 of the output hub 20, the wire frame 44 is sleeved with the outer ring of the second bearing 52 and fixedly matched with the outer ring of the second bearing 52. The arrangement of the second bearing 52 makes the wire frame 44 and the excitation coil 43 more firmly arranged on the output hub 20.

[0053] See also Figure 6 In some embodiments, the disconnectable transmission device further includes a motor shaft 60 and a second output shaft 70. The output shaft 11 and the second output shaft 70 extend outward from both ends of the differential housing 10, respectively, and the output shaft 11 and the second output shaft 70 are coaxial. The motor shaft 60 is sleeved on the outer peripheral side of the second output shaft 70. Figure 6 The disconnectable transmission device adopts a coaxial arrangement scheme, where the motor shaft 60 and the second output shaft 70 are coaxial; see Figure 7 In other embodiments, the disconnectable transmission device further includes an input shaft 80, an intermediate shaft 90 and a second output shaft 70, the output shaft 11 and the second output shaft 70 extend outward from both ends of the differential 10 housing, and the output shaft 11 and the second output shaft 70 are coaxial, the input shaft 80 is connected to the motor, the intermediate shaft 90 is arranged between the differential 10 and the input shaft 80, and the axes of the input shaft 80, the intermediate shaft 90 and the output shaft 11 are arranged side by side, Figure 7 The disconnectable transmission device of the utility model adopts a parallel shaft arrangement scheme. Therefore, the disconnectable transmission device of the utility model is compatible with both parallel shaft arrangement and coaxial arrangement schemes.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments are within the scope of protection required by the present invention.

Claims

1. A disconnectable transmission device, characterized in that: The invention comprises a differential (10), an output hub (20) and a disconnector, wherein the differential (10) comprises an output shaft (11) coaxial with the output hub (20), and the disconnector comprises a connecting shaft (30) and a disconnecting mechanism (40) arranged on the output hub (20). The connecting shaft (30) is configured to be fixed relative to the output hub (20) along the circumferential direction of the output hub (20), movable along the axial direction of the output hub (20), and detachably connected to the output shaft (11). The disconnection mechanism (40) comprises a control member connected to the connection shaft (30), The disconnection mechanism (40) is used to control the control member to move in an axial direction along the output hub (20) to drive the connection shaft (30) to move, thereby connecting and disconnecting from the output shaft (11).

2. The disconnectable transmission device according to claim 1, characterized in that: The control member comprises a first pushing member (41) and a second pushing member (42) which are arranged on the output hub (20); the first pushing member (41) abuts against and is used to push the end of the connecting shaft (30) toward the output shaft (11); and the second pushing member (42) abuts against and is used to push the end of the connecting shaft (30) away from the output shaft (11).

3. The disconnectable transmission device according to claim 2, characterized in that: The connecting shaft (30) comprises a sliding sleeve (31) sleeved on the output hub (20), the sliding sleeve (31) being key-connected to the output hub (20), and one end of the sliding sleeve (31) close to the output shaft (11) being used to contact the output shaft (11).

4. The disconnectable transmission device according to claim 3, characterized in that: The connecting shaft (30) further comprises an end cover (32), wherein the end cover (32) is fixedly mounted on an end of the sliding sleeve (31) relatively away from the output shaft (11), the first pushing member (41) abuts against an end of the end cover (32) relatively close to the output shaft (11), and the second pushing member (42) abuts against an end of the end cover (32) relatively away from the output shaft (11).

5. The disconnectable transmission device according to claim 2, characterized in that: The output hub (20) comprises a stop shoulder (22), and the first pushing member (41) comprises a reset elastic member (411), one end of the reset elastic member (411) is connected to the stop shoulder (22), and the other end abuts against the end of the connecting shaft (30) facing the output shaft (11).

6. The disconnectable transmission device according to claim 5, characterized in that: There are a plurality of the resetting elastic members (411), and the plurality of the resetting elastic members (411) are evenly distributed along the circumference of the output hub (20). The connecting shaft (30) is sleeved on the outer circumference of the output hub (20) and abuts against the plurality of the resetting elastic members (411).

7. The disconnectable transmission device according to claim 2, characterized in that: The disconnect mechanism (40) further comprises an excitation coil (43) for generating an induced magnetic field, and the second pusher (42) comprises a magnetic push block (421), wherein the magnetic push block (421) is used to respond to changes in the induced magnetic field and to move axially along the output hub (20), thereby abutting against and disengaging from the end of the connecting shaft (30) away from the output shaft (11).

8. The disconnectable transmission device according to claim 7, characterized in that: The disconnecting mechanism (40) further comprises a wire rack (44) arranged on the output hub (20), the excitation coil (43) being fixedly arranged on the wire rack (44), the wire rack (44) being provided with a slide groove (441), the magnetic push block (421) being slidably matched with the slide groove (441) along the axial direction of the output hub (20), and the magnetic push block (421) being used for sliding into and out of the slide groove (441) in response to changes in the induced magnetic field.

9. The disconnectable transmission device according to claim 8, characterized in that: The excitation coil (43) is sleeved on the magnetic push block (421); and / or, The slide groove (441) opens toward the connecting shaft (30) and surrounds the output hub (20); the magnetic push block (421) is a magnetic slip ring adapted to the slide groove (441); one end of the magnetic slip ring extends from the opening of the slide groove (441) to the wire rack (44) to abut against the output shaft (11).

10. The disconnectable transmission device according to claim 1, characterized in that: The output shaft (11) is fixedly provided with an output end face tooth (12), and the disconnector further comprises an input end face tooth (312) provided at the end of the connecting shaft (30), and the output end face tooth (12) is adapted to the input end face tooth (312).

11. A car, characterized in that: It comprises a disconnectable transmission device as claimed in any one of claims 1 to 10.

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