Shift drive device

Abstract

The present invention provides a shift driving device, comprising: an actuator that can be driven by a driving mechanism; a rack linked to the actuator, at least one end of which can be elastically deformed, the rack including a connecting portion, and the connecting portion is connected to the actuator through a connecting member; a gear housing provided with an induction gear, the induction gear meshing with the rack, the gear housing having an orbital groove for receiving the rack therein, the orbital groove having a straight rail section and a winding and releasing section, and the end of the rack that undergoes elastic deformation can slide into or out of the winding and releasing section, and the length of the projection of the winding and releasing section on the extension line of the length direction of the straight rail section is less than the length of its track. The shift driving device according to the embodiment of the present invention can be applied to an automatic transmission with a known existing structure, so that without technical modification, the same shift function as that of an electronic shifter can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of gearbox shifting, and in particular to a gear shifting drive device. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] In the prior art, an electronic transmission adapted to an electronic shift driver (SBW, Shift By Wire) can receive a shift signal sent by the SBW, thereby performing a shift operation.

[0004] For example, the "Electronic Shift Driver for Automobiles" with announcement number CN205136570U is a known embodiment provided by the applicant that meets the above description. In this known embodiment, the motor drives the driving wheel to rotate after receiving the shift signal from the central control unit (TCU, Transmission Control Unit), and the driving wheel drives the screw to rotate through the belt and the driven wheel, so that the slider sleeved on the screw moves axially, and the protrusion set on the slider can push the rack to move in the track, thereby driving the magnetic gear to rotate. The rotation of the magnetic gear will produce a change in the magnetic field, so that the Hall sensor senses the change in the magnetic field and realizes the gear recognition information. The TCU adjusts the motor speed according to the gear recognition information, moves the push rod connected to the slider to the specified position, and completes the gear shift.

[0005] Since the P gear used for parking requires a mechanical device to lock the rotating parts of the car, this type of electronic transmission only needs the SBW to provide external driving force when switching to the P gear, while the R, N, and D gears can receive the shift signal provided by the SBW to execute.

[0006] That is to say, the electronic shift driver including the known embodiments provided by the applicant can provide the electronic gearbox with an external driving force to perform the P gear shift, but cannot provide an external force to switch the R, N, and D gears. Therefore, this type of electronic shift driver is only applicable to electronic gearboxes that can receive R, N, and D gear signals, and cannot be extended to other automatic gearboxes with mature technologies. This limits the popularity of the electronic shift driver, making it impossible to apply it to automatic gearboxes that do not want to maintain the existing structure through technical transformation, but want to achieve the same shifting function as the electronic shifter.

[0007] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the Invention

[0008] As described in the above-known embodiments, the electronic shift actuator that is only applicable to providing an external force for shifting to the P gear of the transmission has a relatively short stroke of the protrusion (generally about 17 mm). If an external force for shifting including all gears of P, R, N, and D is to be provided for an existing known automatic transmission structure, the stroke of the protrusion will be greatly extended.

[0009] However, limited by the limited assembly space provided for the electronic shift actuator, if one attempts to achieve the above purpose by lengthening the length of the track on the basis of the original structure, it will obviously increase the volume of the entire electronic shift actuator, and different track lengths need to be designed for different transmissions, making it impossible to achieve product modularization.

[0010] Based on the above-mentioned defects of the prior art, the embodiments of the present invention provide a shift driving device, which can be applicable to an existing known automatic transmission structure, so that it can also achieve the same shift function as the electronic shifter without technical modification.

[0011] In order to achieve the above purpose, the present invention provides the following technical solutions.

[0012] A shift driving device includes:

[0013] An actuator that can be driven by a driving mechanism, and the actuator is used to be connected to a transmission;

[0014] A rack linked to the actuator, at least one end of the rack can be elastically deformed, and the rack includes a connecting portion, and the connecting portion is connected to the actuator through a connecting member;

[0015] A gear housing provided with an induction gear, the induction gear meshes with the rack, the gear housing has a track groove for receiving the rack, the track groove has a straight track section and a winding and unwinding section, and the end of the rack that undergoes elastic deformation can slide into or out of the winding and unwinding section, and the length of the projection of the winding and unwinding section on the extension line of the length direction of the straight track section is less than the length of its track.

[0016] Preferably, the gear housing is provided with the winding and unwinding section on at least one side of the straight track section.

[0017] Preferably, the straight track section is located below the induction gear, and the winding and unwinding section is provided at at least one end of the straight track section.

[0018] Preferably, both ends of the straight track section are bent upward and downward respectively to form two winding and unwinding sections that are in the same plane as the straight track section.

[0019] Preferably, a rigid holding portion is provided on the connecting portion, and the connecting member is a protrusion extending from the rigid holding portion toward the actuator and inserted into a connecting hole provided in the actuator.

[0020] Preferably, the length of the straight rail section is set such that the connecting portion can only slide freely within it along with the actuator.

[0021] Preferably, the rack is provided with a plurality of notches spaced along the length direction on at least the side wall near its end portion capable of recoverable deformation, so that the end portion of the rack capable of recoverable deformation is bent in a drag-reducing manner and enters the winding and unwinding portion.

[0022] Preferably, a gear cover adapted to the gear housing is provided on the gear housing, and a long strip opening for the connecting member to extend out is provided on the gear cover.

[0023] Preferably, the driving mechanism includes a motor, a magnetic field induction element is provided at a position of the gear housing corresponding to the induction gear, and the magnetic field induction element and the motor are signal-connected to the central control unit of the vehicle.

[0024] In the shift driving device according to the embodiment of the present invention, by providing a winding and unwinding section in the gear housing, the length of which projected on the extension line in the length direction of the straight rail section is less than the length of its track, the end portion of the rack accommodated in the track groove and capable of recoverable deformation can slide into or out of the winding and unwinding section. Thus, on the premise of occupying the same space, the stroke of the rack is greatly extended, meeting the requirement that the shift driving device for an automatic transmission requires the rack to have a long stroke. In this way, applying the shift driving device according to the embodiment of the present invention to an automatic transmission with a known existing structure can achieve the same shift function as an electronic shifter without technical modification.

[0025] In addition, by changing the bending degree, i.e., the curvature, of the winding and unwinding section, the track groove can obtain different lengths without changing the straight rail section, so as to meet the varying requirements of different transmissions for the track length. Therefore, the shift driving device according to the embodiment of the present invention has better versatility and is easy to realize product modularization.

[0026] Referring to the following description and the drawings, specific embodiments of the present invention are disclosed in detail, indicating the ways in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope thereby. Within the spirit and terms of the appended claims, the embodiments of the present invention include many changes, modifications, and equivalents.

[0027] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or instead of features in other embodiments.

[0028] It should be emphasized that the term "comprising / including" as used herein refers to the presence of features, whole things, steps or components, but does not exclude the presence or addition of one or more other features, whole things, steps or components. Brief Description of the Drawings

[0029] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way. Additionally, the shapes and proportional dimensions of the components in the figures are only schematic and are used to assist in understanding the present invention, rather than specifically defining the shapes and proportional dimensions of the components of the present invention. Those skilled in the art can, under the teachings of the present invention, select various possible shapes and proportional dimensions according to specific circumstances to implement the present invention. In the drawings:

[0030] Figure 1 is a perspective view of the shift driving device according to an embodiment of the present invention;

[0031] Figure 2 is a sectional view of the shift driving device according to an embodiment of the present invention;

[0032] Figure 3 is a three-dimensional exploded view of the gear housing, gear cover, induction gear and rack in the shift driving device according to an embodiment of the present invention;

[0033] Figure 4 is an assembled sectional view of the gear housing and the induction gear and rack in the shift driving device according to an embodiment of the present invention;

[0034] Figure 5A is a connection schematic diagram of the straight rail section and the winding and unwinding section according to the first preferred embodiment of the present invention;

[0035] Figure 5B is a connection schematic diagram of the straight rail section and the winding and unwinding section according to the second preferred embodiment of the present invention;

[0036] Figure 5C is a connection schematic diagram of the straight rail section and the winding and unwinding section according to the third preferred embodiment of the present invention. Detailed Description of the Embodiments

[0037] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0038] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0040] As Figures 1 to 4 shown, an embodiment of the present invention provides a shift driving device, which may include: an actuator 6 that can be driven by a driving mechanism 1, and the actuator 6 is used to be connected to a gearbox (not shown); a rack 3 linked to the actuator 6, at least one end of the rack 3 can be elastically deformed, and it includes a connecting portion, and the connecting portion is connected to the actuator 6 through a connecting member 301; a gear housing 5 provided with an induction gear 4, the induction gear 4 meshes with the rack 3, the gear housing 5 has an orbital groove 501 for receiving the rack 3, the orbital groove 501 has a winding and unwinding section 501a and a straight rail section 501b, and the end of the rack 3 that undergoes elastic deformation can slide into or out of the winding and unwinding section 501a, and the length of the projection of the winding and unwinding section 501a on the extension line in the length direction of the straight rail section 501b (as Figure 3 shown by the downward projection) is less than the length of its track.

[0041] The shift driving device according to the embodiment of the present invention is provided with a winding and releasing section 501a in the gear housing 5, the length of which projected on the extension line in the length direction of the straight rail section 501b is less than the length of its track. The end of the rack 3 accommodated in the track groove 501 that can undergo recoverable deformation can slide into or out of the winding and releasing section 501a. Thus, on the premise of the same occupied space, the stroke of the rack 3 is greatly extended, meeting the requirement that the shift driving device for an automatic transmission requires the rack 3 to have a longer stroke. In this way, applying the shift driving device according to the embodiment of the present invention to an automatic transmission with a known existing structure can achieve the same shift function as an electronic shifter without technical modification.

[0042] In addition, by changing the bending degree, i.e., the curvature, of the winding and releasing section 501a, the track groove 501 can obtain different lengths without changing the straight rail section 501b, thereby meeting the varying requirements of different gearboxes for the track length. As a result, the shift driving device according to the embodiment of the present invention has better versatility and is easy to realize product modularization.

[0043] As Figure 1 and Figure 2 shown, the actuator 6 may include a screw 601, a slider 604 is sleeved outside the screw 601, the slider 604 is connected with a push rod 602 through a universal joint structure, the other end of the push rod 602 is connected with a socket housing 603 having a ball socket 603a, and the socket housing 603 is connected with the shift arm of the gearbox through the ball socket 603a.

[0044] The driving mechanism 1 may include a motor 101, and the motor 101 can drive the screw 601 to rotate. The specific driving method may be the belt drive provided by the above-known embodiments, and the detailed content is publicly disclosed in the present invention by reference and will not be elaborated herein.

[0045] Alternatively, a gear drive method may also be adopted. Specifically, a driving gear 102 is provided on the output shaft of the motor 101, a driven gear 103 is provided at the end of the screw 601, and the driving gear 102 can be in direct meshing connection with the driven gear 103, or can be an indirect drive realized by meshing with the driven gear 103 through an idler gear 104.

[0046] The connecting member 301 can be connected with the slider 604 or the push rod 602 to realize its connection with the actuator 6. The specific connection method may be that a connection block adapted to the connecting member is provided in the slider 604 or the push rod 602, and the connecting member 301 is inserted into the connection hole.

[0047] The rack 3 is generally in a flat strip shape, and at least has an end that can undergo recoverable deformation (i.e., deformation not exceeding the elastic limit so that it can rebound to its original state), and this end is correspondingly arranged with the winding and unwinding section 501a, so that at least this end of the rack 3 can adapt to the curvature change of the winding and unwinding section 501a and enter it.

[0048] Preferably, the rack 3 can have the performance of recoverable deformation as a whole. Thus, the rack 3 is made of a flexible elastic material such as thermoplastic polyurethane elastomer rubber (TPU, Thermoplastic polyurethanes), so that the rack 3 can be deformed in any direction, enabling the whole of the rack 3 to adapt to the shape of the track groove 501 and deform accordingly, so as to slide into or out of the winding and unwinding section 501a, meeting the requirement that the shift driving device applicable to an automatic transmission requires the rack 3 to have a long stroke.

[0049] When the end of the rack 3 that can undergo recoverable deformation enters the winding and unwinding section 501a, radial bending will occur, so that the inner side of the rack 3 (such as Figure 3 the upper end shown) is compressed. This compression will cause the rack 3 to have a tendency to rebound radially outwards, thus exerting a force on the inner wall of the winding and unwinding section 501a. In this way, the friction between the rack 3 and the inner wall of the winding and unwinding section 501a will be increased, resulting in hindered sliding of the rack 3.

[0050] For this reason, as Figure 3 shown, the rack 3 is provided with a plurality of notches 302 arranged at intervals along the length direction on at least the side wall near its end that can undergo recoverable deformation. These plurality of notches 302 can provide space for the rack 3 to undergo radial deformation when entering the winding and unwinding section 501a, reducing or even avoiding the compression of the inner side of the rack 3, thereby reducing the friction between the rack 3 and the inner wall of the winding and unwinding section 501a, ensuring that the end of the rack 3 that can undergo recoverable deformation is bent in a drag-reducing manner and enters the winding and unwinding section 501a, and ensuring smooth sliding of the rack 3.

[0051] The gear housing 5 can be provided with the winding and unwinding section 501a on at least one side of the straight track section 501b, that is, there is at least one winding and unwinding section 501a. Specifically, the straight track section 501b is located below the induction gear 4, and the winding and unwinding section 501a is provided at at least one end of the straight track section 501b. And preferably, the winding and unwinding section 501a is connected to the straight track section 501b in a smoothly transitioning manner to reduce the situation of blockage and unsmooth sliding of the rack 3 at the connection between the two.

[0052] Furthermore, the winding and unwinding release sections 501a are preferably two, and these two winding and unwinding release sections 501a can specifically be formed by bending the two ends of the straight rail section 501b upward and downward respectively. In this way, the space size of the gear housing 5 can be fully utilized to increase the stroke of the rack 3 as much as possible.

[0053] The two winding and unwinding release sections 501a and the straight rail section 501b are preferably located in the same plane, so that the rack 3 can slide into or out of the winding and unwinding release sections 501a in a non-twisted manner, maintaining the smoothness of the sliding of the rack 3.

[0054] In addition, by making the two winding and unwinding release sections 501a and the straight rail section 501b located in the same plane, the space in the vertical direction of the gear housing 5 can be fully utilized without increasing the space size in the direction perpendicular to the straight rail section 501b. While ensuring the structural compactness, the dimensional structure design is optimized, making it possible for the structure of the gear housing 5 to tend to be miniaturized.

[0055] The projection of the straight rail section 501b on the projection plane perpendicular to the horizontal plane (this horizontal plane is based on the actual use of the shift driving device in the embodiment of the present invention. In this article, this horizontal plane is the plane perpendicular to the paper surface) is a straight line contour, and it smoothly transitions with the winding and unwinding release sections 501a.

[0056] Specifically, as Figure 5A shown, the projection of the winding and unwinding release section 501a (since it is in the same plane as the straight rail section 501b) on the above-mentioned projection plane is an arc contour, and the straight rail section 501b and the winding and unwinding release section 501a are connected in a tangent manner at the junction.

[0057] Or, as Figure 5B shown, the projection of the winding and unwinding release section 501a on the above-mentioned projection plane is an arc contour and a straight line contour, and the arc contour is tangent to the straight rail section 501b and the straight line contour.

[0058] Or, as Figure 5C shown, the projection of the winding and unwinding release section 501a on the above-mentioned projection plane is two arc contours, and the middle arc contour is tangent to the straight rail section 501b and the other arc contour.

[0059] Of course, the above are only illustrative embodiments, and other feasible ways may be included in practice, which are not listed here in the present invention.

[0060] Further referring to Figures 5A to 5C , since the winding and unwinding release sections 501a and the straight rail section 501b are located in the same plane, therefore, the winding and unwinding release sections 501a can project linearly onto the extension line of the length direction of the straight rail section 501b. Then, the length of the projection of the winding and unwinding release section 501a onto the extension line of the length direction of the straight rail section 501b (Figures 5A to 5C The length of the dashed line in the middle is L', and the length of its track (actually its circumference) is L, where L' < L.

[0061] Alternatively, the winding and unwinding release section 501a can also perform a surface projection onto the projection plane defined by the straight rail section 501b. Specifically, the upper and lower surfaces of the straight rail section 501b, or the horizontal plane during the actual use of the shift driving device in the embodiment of the present invention, can both be used as the projection plane. The projected length of the winding and unwinding release section 501a on this projection plane also meets the requirement of being less than its track length.

[0062] In this embodiment, the connecting portion is a part of the structure of the rack 3 itself, which can be the part of the rack 3 near the middle; alternatively, the part where the rack 3 is connected to the connecting member 301 can also be defined as the connecting portion.

[0063] Or, the length of the straight rail section 501b is set such that the connecting portion can only slide freely within it along with the actuator 6. Therefore, the part where the rack 3 only moves within the straight rail section 501b and does not enter the winding and unwinding release section 501a can also be defined as the connecting portion.

[0064] Continuing from the above description, since the connecting portion is connected to the driving mechanism 6 through the connecting member 301, and the driving mechanism 6 drives the connecting portion to move through the connecting member 301, it also drives the rack 3 to move in the track groove 501.

[0065] Generally, to achieve the function of an electronic shifter, the transmission requirements between mechanical components are relatively high, and the transmission between linked components needs to be synchronized, that is, rigid transmission. Otherwise, it is easy to cause final measurement errors and result in inaccurate shifting.

[0066] Specifically in the present invention, when the shift signal triggers the motor 101 to rotate, the speed of the motor 101 is relatively large, and its drive actuator 6 moves from a stationary state to a very high speed, generating a very large acceleration. The driving mechanism 6 will also convert this acceleration into a force and apply it to the connecting member 301, and the connecting member 301 further applies the force to the rack 3. As a result, the connecting member 301 and the rack 3 will bear huge forces, and the connecting member 301 may be deformed. Similarly, since the rack 3 is made of a flexible elastic material, the part of the rack 3 corresponding to the connecting member 301 may also undergo radial bending deformation or stacking. In this way, it will affect the transmission ratio between the rack 3 and the driving mechanism 6, resulting in the axial movement of the push rod 602 being out of sync with the rotation of the rack 3 driving the induction gear 4, and finally causing measurement errors in the magnetic field induction element.

[0067] Because, in order to avoid the above situation as much as possible, the connecting member 301 can be connected to the connecting portion of the rack 3 through the rigid holding portion 7. The rigid holding portion 7 is preferably combined with the rack 3 in a covering manner (the covered portion is the connecting portion) to increase the connection strength between the two, and its thickness is larger than that of the rack 3 to make it have better rigidity.

[0068] The connecting member 301 is preferably integrally formed with the rigid holding portion 7, and its specific forming method can be a protrusion that extends from the rigid holding portion 7 towards the actuator 6 and is inserted into the connecting hole provided in the actuator 6. In this way, the connecting member 301 and the rigid holding portion 7 have the same thickness that is greater than that of the rack 3, thereby forming a thick-walled portion to ensure that it has the rigidity to enable the rack 3 and the actuator 6 to form synchronous transmission.

[0069] When the connecting member 301 is quickly driven by the actuator 6, the connecting portion covered by the rigid holding portion 7 and the rack segment adjacent to the connecting portion will not produce bending deformation or stacking, thereby ensuring better measurement accuracy.

[0070] In addition, to ensure measurement accuracy, it is required that the rack 3 can smoothly slide into or out of the winding and unwinding section 501a. As can be seen from the above, the way for the present invention to enable the end of the rack 3 corresponding to the winding and unwinding section 501a to smoothly enter it in a non-stacked and congested manner is that the rack 3 is made of a flexible and elastic material to have better deformation performance.

[0071] However, the better deformation performance of the rack 3 will correspondingly cause the portion where it is connected to the connecting member 301 to not provide enough rigidity when being quickly driven by the actuator 6.

[0072] That is to say, in order to achieve the purpose of measurement accuracy, it is required that the rack 3 has both better deformation performance and better rigidity at the portion corresponding to the connecting portion, which are two completely opposite and even contradictory properties.

[0073] Therefore, how to keep better rigidity at the portion of the rack 3 corresponding to the connecting member 301 while enabling other parts of the rack 3, especially the end portion, to have better deformation ability is two mutually contradictory technical problems.

[0074] The present invention can preferably solve the above-mentioned mutually contradictory technical problems by providing a rigid holding portion 7 on the connecting portion of the rack 3 made of a flexible and elastic material and combining with the notch 302 provided on the rack 3.

[0075] Among them, the rack 3 made of a flexible and elastic material, combined with the notch 302 provided thereon, can at least enable its end portion to have better deformation performance, so that it can be bent in a drag-reducing manner and smoothly enter the winding and unwinding section 501a. The connecting portion of the rack 3 is connected to the connecting member 301 through the rigid holding portion 7, which can make the rack 3 have better rigidity in the portion corresponding to the connecting portion, so as to realize synchronous transmission with the actuator 6.

[0076] Furthermore, the length of the straight rail section 501 is set such that the rigid holding portion 7 is limited to slide only within the straight rail section 501b, that is, the rigid holding portion 7 only moves linearly within the straight rail section 501b of the track groove 501 and will not enter the winding and unwinding section 501a of the track groove 501. In this way, it is ensured that the connecting member 301 and the rigid holding portion 7 do not undergo radial deformation and bending during the sliding of the rack 3 within the straight rail section 501b.

[0077] As Figure 3 shown, a gear cover 8 adapted to the gear housing 5 can be provided on the gear housing 5. Similarly, the gear cover 8 is also provided with a groove structure identical to the track groove 501. After the gear housing 5 and the gear cover 8 are assembled, the two grooves form an internal space for accommodating the rack 3, thereby limiting the sliding of the rack 3.

[0078] Furthermore, a long strip opening 801 for the connecting member 301 to extend out and corresponding to the straight rail section 501b of the track groove 501 is also provided on the gear cover 8. The connecting member 301 passes through the long strip opening 801 to realize connection with the actuator 6.

[0079] The specific working principle of the shift driving device according to the embodiment of the present invention is that a magnetic field sensing element (for example, a Hall sensor) signal-connected to the TCU is provided at a position of the gear housing 5 corresponding to the sensing gear 4. After the motor 101 receives the shift signal generated by the TCU based on the user's trigger operation and signal-connected thereto, it rotates to drive the screw 601 to rotate. The slider 604 sleeved outside the screw 601 and meshed with it generates an axial movement. The slider 604 pushes the push rod 602 to move, thereby driving the connecting member 301 inserted into the connecting hole of the slider 604 or the push rod 602 to move. The connecting member 301 then causes the rack 3 to slide in the track groove 501, and further the rack 3 drives the sensing gear 4 to rotate by meshing. The rotation of the sensing gear 4 will generate a magnetic field change, and thus the magnetic field sensing element senses this magnetic field change to obtain the gear position identification information. The TCU adjusts the rotation speed or stops the motor 101 according to this gear position identification information, and moves the push rod 602 connected to the slider 604 to a specified position to realize shifting.

[0080] Since the shift driving device according to the embodiment of the present invention extends the stroke of the rack 3, it can not only apply a shift driving force to the transmission by the actuator 6 after receiving a P - gear signal, but also apply a shift driving force to the transmission after receiving R, N, and D - gear signals, thus making it possible for a transmission that does not have the ability to receive R, N, and D - gear signals to achieve electronic shifting.

[0081] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and many applications other than the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this teaching should not be determined with reference to the above description, but should be determined with reference to the foregoing claims and the full scope of equivalents to which those claims are entitled. For the sake of completeness, all articles and references including patent applications and published announcements are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the foregoing claims is not intended to abandon such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A shift driving device, characterized in that, comprising: an actuator that can be driven by a driving mechanism, and the actuator is used to be connected to a gearbox; a rack linked to the actuator, at least one end of the rack can be elastically deformed, the rack includes a connecting portion, and the connecting portion is connected to the actuator through a connecting member; wherein, a rigid holding portion is disposed on the connecting portion and is integrally formed with the rack in a covering manner, and the connecting member is connected to the connecting portion of the rack through the rigid holding portion; a gear housing provided with an induction gear, the induction gear meshes with the rack, the gear housing has a track groove for receiving the rack, the track groove has a straight track section and a winding and unwinding section, and the end of the rack that can be elastically deformed can slide into or out of the winding and unwinding section, and the length of the projection of the winding and unwinding section on the extension line of the length direction of the straight track section is less than the length of its track.

2. The shift driving device according to claim 1, characterized in that, the gear housing is provided with the winding and unwinding section on at least one side of the straight track section.

3. The shift driving device according to claim 1, characterized in that, the straight track section is located below the induction gear, and the winding and unwinding section is provided at at least one end of the straight track section.

4. The shift driving device according to claim 3, characterized in that, both ends of the straight track section are bent upward and downward respectively to form two winding and unwinding sections that are in the same plane as the straight track section.

5. The shift driving device according to claim 1, characterized in that, the connecting member is a protrusion extending from the rigid holding portion towards the actuator and inserted into a connecting hole provided in the actuator.

6. The shift driving device according to claim 1, characterized in that, the length of the straight track section is set such that the connecting portion can only freely slide therein along with the actuator.

7. The shift driving device according to claim 1 or 5, characterized in that, the rack is provided with a plurality of notches arranged at intervals along the length direction on at least the side wall near the end that can be elastically deformed, so that the end of the rack that can be elastically deformed is bent in a drag-reducing manner and enters the winding and unwinding portion.

8. The shift driving device according to claim 1, characterized in that, a gear cover adapted to the gear housing is provided on the gear housing, and a long strip opening for the connecting member to extend out is provided on the gear cover.

9. The shift driving device according to claim 1, characterized in that, the driving mechanism includes a motor, a magnetic field induction element is provided at a position corresponding to the induction gear on the gear housing, and the magnetic field induction element and the motor are signal-connected to a central control unit of an automobile.

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