Tooth searching device for combined installation of motor and differential mechanism

Abstract

The utility model discloses a motor differential combined gear searching device, which relates to the technical field of differential gear searching and comprises a support rod, a telescopic pin and a driving device. The supporting rod is provided with a shaft hole and a sliding hole formed in the side wall of the supporting rod, and the sliding hole is communicated with the shaft hole; the telescopic pin is at least partially arranged in the sliding hole; the driving device is arranged in the shaft hole and used for driving the telescopic pin to slide in the sliding hole, so that the telescopic pin slides outwards to protrude out of the outer side of the sliding hole so as to be embedded into a pin hole of a planet wheel pin shaft of a motor differential mechanism, or the telescopic pin slides inwards to be contained in the sliding hole. According to the motor differential assembly tooth searching device, the tooth searching efficiency of the motor differential of a new energy automobile can be improved, operation is convenient, and it is ensured that the assembly quality is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to differential gear tooth searching technical field especially relates to a motor differential gear combined installation tooth searching device. BACKGROUND

[0002] With the development of new energy vehicles, the product intelligence degree is relatively high and the performance is very strong under the condition of meeting market demand. The corresponding structure is more and more complex, especially the new energy motor of driving vehicle. Because the product structure is complex, it is difficult to search tooth during combined installation after assembly or maintenance. Because the gear is in a free sliding state, the internal space is small and there is no space for manual operation, the difficulty coefficient of combined installation after assembly and maintenance is large, and the assembly quality cannot be guaranteed. INVENTION CONTENTS

[0003] The technical problem to be solved by the utility model is how to improve the efficiency of motor differential gear tooth searching.

[0004] In order to solve the above problems, the utility model embodiment provides a motor differential gear combined installation tooth searching device, the motor differential gear combined installation tooth searching device includes support rod, telescopic pin and drive device, the support rod is provided with shaft hole and sliding hole in the side wall of the support rod, the sliding hole is communicated with the shaft hole, the telescopic pin is at least partially arranged in the sliding hole, the drive device is arranged in the shaft hole and is used for driving the telescopic pin to slide in the sliding hole, so that the telescopic pin slides outward to the outside of the sliding hole and is embedded into the pin hole of the planet wheel pin shaft of the motor differential gear, or the telescopic pin slides inward and is accommodated in the sliding hole.

[0005] Further technical solutions are that the drive device includes driving shaft, transmission rod and magnetic piece, the driving shaft is connected with the transmission rod, the magnetic piece is arranged at one end of the transmission rod, and the magnetic piece attracts the telescopic pin through magnetic force, wherein the driving shaft is used for driving the transmission rod to slide in the shaft hole.

[0006] Further technical solutions are that the driving shaft is screw connected with the transmission rod.

[0007] Further technical solutions are that one end of the transmission rod is provided with an inlay groove, and the magnetic piece is embedded in the inlay groove.

[0008] Further technical solutions are that the surface of the driving shaft is provided with a first limiting sliding groove, the plane where the first limiting sliding groove is located is perpendicular to the axial direction of the driving shaft, and the support rod is provided with a first limiting hole communicated with the shaft hole.

[0009] The motor differential combined installation tooth searching device further comprises a first limiting member, the first limiting member is embedded in the first limiting sliding groove through the first limiting hole.

[0010] Further, the motor differential combined installation tooth searching device further comprises a fixing shaft and a positioning ring, the positioning ring is sleeved on one end of the supporting rod and is slidable on the supporting rod; the positioning ring is sleeved on the fixing shaft to connect the fixing shaft and the supporting rod by sliding the positioning ring, or the positioning ring is separated from the fixing shaft.

[0011] Further, an end of the fixing shaft is provided with a limiting boss, and the positioning ring is slidable to a position sleeved with the limiting boss.

[0012] Further, a positioning hole is formed in the positioning ring, and at least two positioning grooves are formed in the supporting rod and are spaced apart along an axial direction.

[0013] The motor differential combined installation tooth searching device further comprises a positioning member, the positioning member passes through the positioning hole, and the positioning member is switched to be embedded in different positioning grooves by sliding the positioning ring, so as to fix the positioning member in a position sleeved with the fixing shaft or a position separated from the fixing shaft.

[0014] Further, an end of the fixing shaft is provided with a receiving groove, and one end of the driving shaft is inserted into the receiving groove.

[0015] A surface of the driving shaft is provided with a second limiting sliding groove, a plane where the second limiting sliding groove is located is perpendicular to an axial direction of the driving shaft, and a second limiting hole of the fixing shaft is formed and communicates with the receiving groove.

[0016] The motor differential combined installation tooth searching device further comprises a second limiting member, the second limiting member is embedded in the second limiting sliding groove through the second limiting hole.

[0017] Further, a fastening hole is formed in a surface of the fixing shaft.

[0018] The motor differential combined installation tooth searching device further comprises a fixing base, a base fixing pin and a driving handle, an end surface of the fixing base is provided with a center hole, one end of the fixing shaft is inserted into the center hole, and the base fixing pin is detachably embedded in the fastening hole through a side wall of the center hole.

[0019] Compared with the prior art, the technical effects that can be achieved by the embodiments of the utility model include:

[0020] The utility model discloses an embodiment proposes a kind of motor differential combined installation tooth searching device, it includes support rod, telescopic pin and driving device;The support rod is opened with shaft hole and is located the sliding hole of the side wall of the support rod, the sliding hole is communicated with the shaft hole;The telescopic pin is at least partially located in the sliding hole;The driving device is located in the shaft hole, for driving the telescopic pin sliding in the sliding hole, so that the telescopic pin slides outward to protrude the outside of the sliding hole to embed in the pin hole of motor differential planetary wheel pin shaft, or so that the telescopic pin slides inward to be housed in the sliding hole.When the telescopic pin slides outward to protrude the outside of the sliding hole, the telescopic pin embeds in the pin hole of motor differential planetary wheel pin shaft, by rotating the support rod can drive the planetary wheel pin shaft rotation (specifically can be small amplitude left and right back and forth rotation), to make motor differential complete tooth process.After tooth, by driving device so that the telescopic pin slides inward to be housed in the sliding hole, the motor differential combined installation tooth searching device is removed from the motor differential, to be able to complete motor differential tooth process in narrow operation space, improve the efficiency of motor differential tooth searching of new energy automobile, facilitate operation, ensure that assembly quality is good. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be briefly introduced to the drawing needed to be used in embodiment description, obviously, the drawing in the following description is some embodiments of the utility model, for those skilled in the art, without creating labor, according to these drawings, other drawings can also be obtained.

[0022] Figure 1 An explosion diagram of the motor differential combined installation tooth searching device according to the utility model embodiment is provided.

[0023] Figure 2 A sectional view of the motor differential combined installation tooth searching device according to the utility model embodiment is provided.

[0024] Figure 3 A structural schematic view of the fixed shaft of the motor differential combined installation tooth searching device according to the utility model embodiment is provided.

[0025] Figure 4 A use state schematic view of the motor differential combined installation tooth searching device according to the utility model embodiment is provided.

[0026] Figure 5 An enlarged view of the pin hole of the planetary wheel pin shaft in the utility model embodiment is provided.

[0027] Reference Signs

[0028] The planetary wheel pin shaft D, the center retainer E, the tower type planetary wheel F, the support tool G, the support rod 10, the telescopic pin 20, the driving device 30, the first limiting piece 40, the fixed shaft 50, the positioning ring 60, the second limiting piece 70, the fixed base 80, the base fixing pin 90, the driving handle 100, the dust cover 110, the positioning piece 120, the shaft hole 11, the sliding hole 12, the first limiting hole 13, the positioning groove 14, the driving shaft 31, the transmission rod 32, the magnetic piece 33, the inlay groove 321, the first limiting sliding groove 311, the second limiting sliding groove 312, the limiting boss 51, the containing groove 52, the second limiting hole 53, the fastening hole 54, the positioning hole 61, the center hole 81, the pin hole D1, and the planetary wheel bolt D2. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments will be clearly and completely described with reference to the drawings in the embodiments of the present application, and similar components are denoted by similar reference numerals in the drawings. Obviously, the following described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] It should be understood that, when used in the specification and the appended claims, the terms "comprise" and "include" indicate the presence of described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0031] It should also be understood that the terms used in the specification of the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present application. As used in the specification and the appended claims of the embodiments of the present application, the singular forms "a", "an" and "the" are intended to include the plural forms, unless the context clearly indicates otherwise.

[0032] Referring to Figures 1-5 The motor differential combined tooth searching device can improve the efficiency of motor differential tooth searching of a new energy vehicle, is convenient to operate, and ensures good assembly quality. In order to achieve the above technical purpose, the motor differential combined tooth searching device comprises a support rod 10, a telescopic pin 20 and a driving device 30, and the specific structure is introduced as follows:

[0033] The support rod 10 is provided with an axle hole 11 and a sliding hole 12 on the side wall of the support rod 10, and the sliding hole 12 is communicated with the axle hole 11. The axle hole 11 is used for installing the driving device 30, and the sliding hole 12 is used for installing the telescopic pin 20. The end of the support rod 10 is further provided with a dust cover 110 covering the axle hole 11, which plays a dustproof role.

[0034] The telescopic pin 20 is at least partially arranged in the sliding hole 12 and can be driven by the driving device 30 to slide out of the sliding hole 12 or slide into the sliding hole 12.

[0035] The driving device 30 is arranged in the axle hole 11 and used for driving the telescopic pin 20 to slide in the sliding hole 12, so that the telescopic pin 20 slides outward to the outside of the sliding hole 12 to be embedded in the pin hole D1 of the planetary pin shaft D of the motor differential, or the telescopic pin 20 slides inward to be arranged in the sliding hole 12.

[0036] The number of the telescopic pin 20 and the sliding hole 12 is the same, and both can be multiple, for example, three in the embodiment. The multiple sliding holes 12 are uniformly arranged on the outside of the support rod 10.

[0037] In specific implementation, when the telescopic pin 20 slides outward to the outside of the sliding hole 12, the telescopic pin 20 is embedded in the pin hole D1 of the planetary pin shaft D of the motor differential, and the planetary pin shaft D can be driven to rotate (specifically, left and right rotation) by rotating the support rod 10, so that the motor differential completes the indexing process. After the indexing is completed, the telescopic pin 20 is driven by the driving device 30 to slide inward to be arranged in the sliding hole 12, and the motor differential assembly and the indexing device are removed from the motor differential, so that the indexing process of the motor differential can be completed in a narrow working space, the efficiency of the motor differential indexing of the new energy vehicle is improved, the operation is facilitated, and the assembly quality is ensured to be good.

[0038] In some embodiments, for example, in the embodiment, the driving device 30 includes a driving shaft 31, a transmission rod 32, and a magnetic piece 33. The driving shaft 31 is connected with the transmission rod 32, the magnetic piece 33 is arranged at one end of the transmission rod 32, and the magnetic piece 33 attracts the telescopic pin 20 by magnetic force. The driving shaft 31 is used for driving the transmission rod 32 to slide in the axle hole 11.

[0039] In specific implementation, the material of the magnetic piece 33 can be a magnet, and the magnetic piece 33 can be specifically a cone-shaped. The material of the telescopic pin 20 can be a material that can be attracted by a magnet, for example, iron. When the transmission rod 32 moves towards the telescopic pin 20, the magnetic piece 33 presses the telescopic pin 20, so that the telescopic pin 20 slides outward to the outside of the sliding hole 12. When the transmission rod 32 moves away from the telescopic pin 20, the magnetic piece 33 attracts the telescopic pin 20 into the sliding hole 12 by magnetic force.

[0040] Further, the driving shaft 31 is threadedly connected with the transmission rod 32. For example, the outer surface of one end of the driving shaft 31 is provided with external threads, one end of the transmission rod 32 is provided with a threaded hole, and the end of the driving shaft 31 provided with external threads is threadedly connected with the threaded hole. The position of the driving shaft 31 is fixed, and by rotating the driving shaft 31, the transmission rod 32 can be caused to slide along the driving shaft 31.

[0041] Further, one end of the transmission rod 32 is provided with an inlaid groove 321, and the magnetic member 33 is inlaid in the inlaid groove 321, so as to realize reliable fixing of the magnetic member 33.

[0042] Further, the surface of the driving shaft 31 is provided with a first limiting sliding groove 311, and the plane where the first limiting sliding groove 311 is located is perpendicular to the axial direction of the driving shaft 31; the support rod 10 is provided with a first limiting hole 13 which is in communication with the shaft hole 11; the motor differential combined assembling and tooth searching device further comprises a first limiting member 40, and the first limiting member 40 is inlaid in the first limiting sliding groove 311 through the first limiting hole 13.

[0043] In specific implementation, the first limiting sliding groove 311 can be specifically an annular groove which surrounds the driving shaft 31 once. The first limiting member 40 can be specifically a positioning screw. By the first limiting member 40, the driving shaft 31 can be kept in position during rotation, so as to cause the transmission rod 32 to slide along the driving shaft 31.

[0044] Further, the motor differential combined assembling and tooth searching device further comprises a fixing shaft 50 and a positioning ring 60, and the positioning ring 60 is sleeved on one end of the support rod 10 and can slide on the support rod 10; wherein, by sliding the positioning ring 60, the positioning ring 60 can be sleeved on the fixing shaft 50, so as to connect the fixing shaft 50 and the support rod 10; or the positioning ring 60 can be separated from the fixing shaft 50.

[0045] In specific implementation, by sliding the positioning ring 60 towards the fixing shaft 50, the positioning ring 60 can be sleeved on the fixing shaft 50, so as to connect the fixing shaft 50 and the support rod 10 into a whole, and thus, by rotating the fixing shaft 50, the support rod 10 can be synchronously driven to rotate. By sliding the positioning ring 60 away from the fixing shaft 50, the positioning ring 60 can be separated from the fixing shaft 50.

[0046] Further, in order to better realize limiting and fixing of the fixing shaft 50 and the positioning ring 60, the end of the fixing shaft 50 is provided with a limiting boss 51, and the positioning ring 60 can be slid to a position where the limiting boss 51 is sleeved. The limiting boss 51 and the ring hole of the positioning ring 60 are matched in shape and size, for example, both can be regular hexagons and have the same size.

[0047] Further, in order to realize the fixation of the position of the positioning ring 60, a positioning hole 61 is arranged on the positioning ring 60, and at least two positioning grooves 14 are arranged on the support rod 10 and are spaced along the axial direction;

[0048] The motor differential combined assembling and tooth searching device further comprises a positioning member 120, the positioning member 120 passes through the positioning hole 61, and the positioning member 120 is switched and embedded into different positioning grooves 14 by sliding the positioning ring 60, so as to fix the positioning member 120 at a position where the positioning member 120 is sleeved with the fixing shaft 50 or fix the positioning member 120 at a position where the positioning member 120 is separated from the fixing shaft 50.

[0049] In the embodiment, the positioning member 120 can be a positioning knob. The positioning member 120 passes through the positioning hole 61, and the positioning member 120 is aligned with the positioning groove 14 by sliding the positioning ring 60, and then the positioning member 120 is embedded into the positioning groove 14, so as to realize the fixation of the position of the positioning ring 60. In the utility model, at least one positioning groove 14 corresponds to the fixation of the positioning ring 60 at the position where the positioning ring 60 is sleeved with the fixing shaft 50, and at least one positioning groove 14 corresponds to the fixation of the positioning ring 60 at the position where the positioning ring 60 is separated from the fixing shaft 50.

[0050] Further, an accommodation groove 52 is arranged at the end of the fixing shaft 50, and one end of the driving shaft 31 is inserted into the accommodation groove 52.

[0051] A second limiting sliding groove 312 is arranged on the surface of the driving shaft 31, and the plane where the second limiting sliding groove 312 is arranged is perpendicular to the axial direction of the driving shaft 31; and a second limiting hole 53 which is communicated with the accommodation groove 52 is arranged on the fixing shaft 50.

[0052] The motor differential combined assembling and tooth searching device further comprises a second limiting member 70, the second limiting member 70 passes through the second limiting hole 53 and is embedded into the second limiting sliding groove 312.

[0053] In the embodiment, the second limiting sliding groove 312 can be a ring-shaped groove which surrounds the driving shaft 31. The second limiting member 70 can be a positioning screw. The second limiting member 70 can keep the driving shaft 31 in a fixed position during rotation, so that the transmission rod 32 can slide along the driving shaft 31. In the embodiment, the double limiting of the first limiting sliding groove 311 and the second limiting sliding groove 312 can greatly improve the reliability of the limiting of the driving shaft 31.

[0054] Further, a fastening hole 54 is arranged on the surface of the fixing shaft 50.

[0055] The motor differential combined assembling and tooth searching device further comprises a fixed base 80, a base fixing pin 90 and a driving handle 100. The end surface of the fixed base 80 is provided with a center hole 81, and one end of the fixed shaft 50 is inserted into the center hole 81. The base fixing pin 90 is detachably embedded into the fastening hole 54 through the side wall of the center hole 81.

[0056] In a specific implementation, the side wall of the center hole 81 is provided with a notch, and the base fixing pin 90 is detachably embedded into the fastening hole 54 through the notch. When the base fixing pin 90 is embedded into the fastening hole 54, the fixed base 80 can be fixed. The fixed base 80 can be rotated by the driving handle 100, and the fixed shaft 50 is synchronously rotated.

[0057] Further, referring to Figure 4 , Figure 4 is a use state schematic diagram of the motor differential combined assembling and tooth searching device, Figure 4 In the motor differential combined assembling and tooth searching device, the motor differential comprises a planetary pin shaft D, a center retainer E and a tower planetary wheel F. The planetary pin shaft D comprises a pin hole D1 and a planetary pin D2. The motor differential is placed on a supporting tool G, and the motor differential combined assembling and tooth searching device is inserted into the motor differential. When the telescopic pin 20 slides outward to the outside of the convex sliding hole 12, the telescopic pin 20 is embedded into the pin hole D1 of the planetary pin shaft D of the motor differential. The planetary pin shaft D can be rotated (specifically, a small amplitude left and right rotation) by rotating the supporting rod 10, so that the motor differential completes the tooth searching process.

[0058] Specifically, the working principle of the motor differential combined assembling and tooth searching device is as follows:

[0059] After the base fixing pin 90 is manually pulled out, the fixed base 80 of the motor differential combined assembly tooth searching device is put into the center hole 81, and the base fixing pin 90 is returned to the original position and embedded into the fastening hole 54 of the fixed base 80. The motor differential shell is placed in the corresponding position of the support tool G, and after the motor differential is placed in position, the operator uses a 32mm open-end wrench to clamp the positioning ring 60 to keep it from moving, and at the same time, uses a 24mm open-end wrench to clamp the hexagonal surface of the driving shaft 31, rotates counterclockwise, and the head screw rotates to drive the transmission rod 32 and the magnetic part 33 to move outward, so that the telescopic pin 20 is ejected, the telescopic pin 20 is inserted into the pin hole D1 of the planetary gear pin shaft D, and the wrench is completely removed. The positioning ring 60 is manually pulled down to be sleeved on the hexagonal surface limiting boss 51 of the fixed base 80, the inner surface of the positioning ring 60 is aligned with the outer surface of the limiting boss 51, so that the support rod 10, the positioning part 120 and the fixed shaft 50 are connected into an integrated body and kept relatively stationary. The driving handle 100 is manually held and slightly rotated left and right, the center holder E is driven by the telescopic pin 20 to simultaneously rotate the tower type planetary gear F up and down, the combined shell and the reducer are assembled, and the teeth of the upper and lower gears of the differential are completed during the rotation of the gears. After the tooth searching and assembling are completed, the positioning ring 60 is manually pushed to the limiting top of the support rod 10 to release the constraint between the support rod 10, the positioning part 120 and the fixed shaft 50, the operator uses a 32mm open-end wrench to clamp the positioning ring 60 to keep it from moving, and at the same time, uses a 24mm wrench to clamp the hexagonal surface of the driving shaft 31, rotates clockwise, the head screw drives the transmission rod 32 and the magnetic part 33 to move inward, the magnetic part 33 attracts the telescopic pin 20 to move to the shaft center, and after the telescopic pin 20 is retracted into the sliding hole 12, the motor differential is taken out from the support tool G, and the tooth searching and assembling are completed.

[0060] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0061] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0062] In addition, the terms "first", "second", "third", etc. are used herein only to describe different instances, and do not imply or suggest relative importance or a number of the technical features indicated. Thus, the features defined with "first", "second", etc. can include one or more of the features explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0063] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connection", "fixing" and the like should be interpreted broadly, for example, it can be connected, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0064] In the present application, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and oblique above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature to the second feature include the vertical direction of the first feature below and oblique below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0065] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application.

[0066] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, these modifications and variations of the present application are within the scope of the claims of the present application and its equivalent technologies, and the present application also intends to include these modifications and variations.

[0067] The above description is a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A motor differential combined gear search device, characterized in that: It includes a support rod, a telescopic pin and a driving device; the support rod is provided with an axial hole and a sliding hole provided on the side wall of the support rod, and the sliding hole is connected to the axial hole; the telescopic pin is at least partially provided in the sliding hole; the driving device is provided in the axial hole, and is used to drive the telescopic pin to slide in the sliding hole, so that the telescopic pin slides outward to the outside of the sliding hole protruding to embed into the pin hole of the planetary gear pin shaft of the motor differential, or the telescopic pin slides inward to be received in the sliding hole.

2. The motor differential combined gear-finding device according to claim 1, characterized in that: The driving device includes a driving shaft, a transmission rod and a magnetic component, wherein the driving shaft is connected to the transmission rod, the magnetic component is provided at one end of the transmission rod, and the magnetic component attracts the telescopic pin by magnetic force; wherein the driving shaft is used to drive the transmission rod to slide in the shaft hole.

3. The motor differential combined gear-finding device according to claim 2, characterized in that: The driving shaft is threadedly connected to the transmission rod.

4. The motor differential combined gear-finding device according to claim 2, characterized in that: One end of the transmission rod is provided with an embedding groove, and the magnetic member is embedded in the embedding groove.

5. The motor differential combined gear-finding device according to claim 2, characterized in that: A first limiting groove is provided on the surface of the drive shaft, and the plane where the first limiting groove is located is perpendicular to the axial direction of the drive shaft; a first limiting hole communicating with the shaft hole is opened on the support rod; The motor differential combined gear-finding device further includes a first limiting member, which passes through the first limiting hole and is embedded in the first limiting sliding groove.

6. The motor differential combined gear-finding device according to claim 5, characterized in that: The motor differential combined gear-finding device also includes a fixed shaft and a positioning ring, which is sleeved on one end of the support rod and can slide on the support rod; wherein, by sliding the positioning ring, the positioning ring can be sleeved on the fixed shaft to connect the fixed shaft and the support rod; or the positioning ring can be disengaged from the fixed shaft.

7. The motor differential combined gear-finding device according to claim 6, characterized in that: A limiting boss is provided at the end of the fixed shaft, and the positioning ring can slide to a position where it is sleeved with the limiting boss.

8. The motor differential combined gear-finding device according to claim 6, characterized in that: The positioning ring is provided with a positioning hole, and the support rod is provided with at least two positioning grooves spaced apart along the axial direction; The motor differential combined gear-finding device also includes a positioning member, which passes through the positioning hole, and by sliding the positioning ring, the positioning member can be switched and embedded in different positioning grooves to fix the positioning member in a position where it is sleeved with the fixed shaft, or to fix the positioning member in a position where it is disengaged from the fixed shaft.

9. The motor differential combined gear-finding device according to claim 6, characterized in that: An accommodating groove is provided at the end of the fixed shaft, and one end of the driving shaft is inserted into the accommodating groove; A second limiting groove is provided on the surface of the driving shaft, and the plane where the second limiting groove is located is perpendicular to the axial direction of the driving shaft; a second limiting hole communicating with the accommodating groove is opened on the fixed shaft; The motor differential combined gear-finding device further includes a second limiting member, which passes through the second limiting hole and is embedded in the second limiting sliding groove.

10. The motor differential combined gear-finding device according to claim 6, characterized in that: The surface of the fixed shaft is provided with a fastening hole; The motor differential combined gear-finding device also includes a fixed base, a base fixing pin and a driving handle. The end face of the fixed base is provided with a center hole, one end of the fixed shaft is inserted into the center hole, and the base fixing pin passes through the side wall of the center hole and is detachably embedded in the fastening hole.

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