Front auxiliary box lock pin type synchronizer of AMT

Abstract

The utility model belongs to the field of synchronizers, and particularly relates to a front auxiliary box lock pin type synchronizer of an AMT. The synchronizer comprises a sliding sleeve, a radial plate, a high-gear conical ring assembly and a low-gear conical ring assembly, the input shaft is sleeved with the sliding sleeve in a sliding mode, and the radial plate is fixedly installed on the sliding sleeve. The high-gear conical ring assembly and the low-gear conical ring assembly are arranged on the two sides of the radial plate correspondingly, the high-gear conical ring assembly and the low-gear conical ring assembly are each provided with a conical hole, and the surfaces, located at the conical holes, of the high-gear conical ring assembly and the low-gear conical ring assembly are friction surfaces. The friction cone rings are used for being correspondingly matched with friction cone rings on the end faces of an external high-gear differential gear and an external low-gear differential gear to form a friction pair. On the basis that the existing layout is not changed, the requirement of the AMT for the synchronizer with the long gear shifting service life is met.

Description

Technical Field

[0001] The utility model relates to a synchronizer, in particular to a front auxiliary box lock pin type synchronizer of an AMT. Background Art

[0002] The lock pin type synchronizer has a relatively simple structure and good impact resistance. It is suitable for auxiliary box synchronizers of pneumatic shifting with large shifting force and impact.

[0003] The existing pin-type synchronizers are widely used and mature in traditional mechanical transmissions (MT), but the pin-type synchronizers used in traditional mechanical transmissions are not completely suitable for automatic mechanical transmissions (AMT). Compared with MT, AMT can adjust the speed difference through motors, etc., which is conducive to synchronization. Therefore, the pin-type synchronizers used in AMT do not need additional improvement in synchronization capacity. However, compared with MT, AMT's gear switching is more frequent, and the warranty period is twice or more than that of MT. Therefore, very high requirements are placed on the life of the synchronizer, which is generally twice or more than the life of the synchronizer used in MT.

[0004] However, some parts of the existing pin-type synchronizers used in AMT are prone to failure during frequent gear shifting, resulting in a higher overall failure rate and a lower lifespan of the pin-type synchronizers, making it difficult to meet the AMT's demand for synchronizers with long gear shifting lives. Utility Model Content

[0005] The purpose of the utility model is to solve the technical problem that some parts of the existing lock pin type synchronizer used in AMT are prone to failure during frequent gear shifting, which makes the overall failure rate of the lock pin type synchronizer high and the life short, making it difficult to meet the AMT's demand for a synchronizer with a long gear shifting life, and to provide a front auxiliary box lock pin type synchronizer for AMT.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A front auxiliary box lock pin synchronizer of AMT, which is special in that:

[0008] It includes a sliding sleeve, a spoke plate, a high-speed cone ring assembly and a low-speed cone ring assembly;

[0009] The sliding sleeve is slidably mounted on the input shaft, and the spoke plate is fixedly mounted on the sliding sleeve and cooperates with the external shift fork to shift the sliding sleeve to move along the axial direction of the input shaft under the action of the external shift fork;

[0010] The outer circumferential surfaces at both ends of the sliding sleeve are respectively provided with sliding sleeve coupling teeth for correspondingly meshing with the gear coupling teeth on the external high-speed differential gear or low-speed differential gear; 2N spoke plate locking holes are provided on the end surface of the spoke plate along the circumferential direction; N≥3;

[0011] The high-gear cone ring assembly and the low-gear cone ring assembly are respectively arranged on both sides of the spoke plate;

[0012] The high-gear cone ring assembly includes a high-gear cone ring body, N high-gear locking pins arranged on one side of the high-gear cone ring body close to the spoke plate along the circumferential direction, N high-gear locking holes arranged on the end surface of the high-gear cone ring body along the circumferential direction, and N elastic locking mechanisms respectively arranged at the N high-gear locking holes;

[0013] N high-gear locking pins and N high-gear locking holes are arranged at intervals along the circumferential direction and are arranged one-to-one corresponding to the 2N spoke plate locking holes, and one end of the N high-gear locking pins is placed in the corresponding N spoke plate locking holes; the high-gear locking holes are elliptical holes;

[0014] The low-gear cone ring assembly comprises a low-gear cone ring body and N low-gear locking pins arranged on one side of the low-gear cone ring body close to the spoke plate along the circumferential direction;

[0015] N low-gear locking pins are arranged in one-to-one correspondence with the N high-gear locking holes, one end of the N low-gear locking pins respectively passes through the corresponding N spoke plate locking holes and is placed in the N high-gear locking holes, and respectively forms an elastic locking structure with the corresponding N elastic locking mechanisms;

[0016] The inner holes of the high-gear cone ring body and the low-gear cone ring body are both set as tapered holes, and the surfaces of the high-gear cone ring body and the low-gear cone ring body located at the tapered holes are friction surfaces, which are used to form a friction pair with the friction cone rings on the end faces of the external high-gear differential gear and the low-gear differential gear.

[0017] Furthermore, spring holes are respectively arranged at the N high-gear locking holes on the side wall of the high-gear cone ring body, and the spring holes are correspondingly connected to the high-gear locking holes; the elastic locking mechanism is arranged in the spring hole, and its elastic output end is abutted against the end circumferential side of the low-gear locking pin.

[0018] Furthermore, the elastic locking mechanism includes an elastic locking pin, an elastic locking head whose one end is fixedly connected to one end of the elastic locking pin, and a locking spring mounted on the elastic locking pin; the diameter of the elastic locking head is larger than the diameter of the elastic locking pin, one end of the locking spring abuts against the elastic locking head, and the other end abuts against the bottom end of the spring hole; the other end of the elastic locking head serves as an elastic output end, abutting against the end peripheral side of the low-gear locking pin.

[0019] Further, the maximum length of the elastic locking pin is defined as x, the radial dimension of the portion of the elastic locking head whose radius is greater than the radius of the elastic locking pin is defined as b, and the maximum inclination angle of the elastic locking pin in the spring hole is defined as α;

[0020] Then, the maximum length x of the elastic locking pin satisfies the following condition: x=b / tanα.

[0021] Further, the low gear locking pin comprises a low gear locking block and a low gear locking rod having one end connected to one end of the low gear locking block; the radial dimension of the low gear locking block is greater than the radial dimension of the low gear locking rod, and the length of the low gear locking rod is greater than the length of the high gear locking rod; one end of the low gear locking block is connected to a side of the low gear cone ring body close to the spoke plate;

[0022] The spoke plate locking hole corresponding to the low gear locking pin on the spoke plate is adapted to the low gear locking block.

[0023] Furthermore, a low-gear locking ring groove is provided on the circumferential side of the other end of the low-gear locking rod; and the elastic output end of the elastic locking structure abuts against the low-gear locking ring groove.

[0024] Further, the high gear locking pin includes a high gear locking block and a high gear locking rod having one end connected to one end of the high gear locking block; the radial dimension of the high gear locking block is greater than the radial dimension of the high gear locking rod; one end of the high gear locking block is connected to a side of the high gear cone ring body close to the spoke plate;

[0025] The spoke plate locking hole on the spoke plate corresponding to the high gear locking pin is adapted to the high gear locking block.

[0026] Furthermore, the spoke plate and the sliding sleeve are fixedly connected via a plurality of positioning pins.

[0027] Furthermore, the number of the positioning pins is two, and they are arranged opposite to each other along the circumferential direction.

[0028] Compared with the prior art, the beneficial effects of the utility model are:

[0029] 1. The utility model sets the high-gear locking hole as an elliptical hole, so that after locking is completed, when the low-gear locking pin is pushed back to the initial position by the spring force, a sufficient movable angle is given to the low-gear locking pin, thereby preventing the high-gear locking hole from being repeatedly impacted by the low-gear locking pin and causing cracks, thereby affecting the life of the entire synchronizer.

[0030] 2. In the process of shifting, the spoke plate drives the sliding sleeve to engage the gear. The multiple positioning pins evenly arranged ensure that the sliding sleeve is evenly stressed during the gear engaging process, and does not break due to stress concentration caused by deflection.

[0031] 3. The utility model improves the life of the wearing part - the locking spring, and thus improves the life of the entire synchronizer by coordinating the length of the elastic locking pin and the stiffness of the locking spring while ensuring reliable locking.

[0032] 4. Through the above design, the utility model meets the AMT's demand for a synchronizer with a long shift life without changing the existing layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1It is an assembly schematic diagram of an embodiment of a front auxiliary box lock pin synchronizer of an AMT of the utility model;

[0034] Figure 2 It is a structural schematic diagram of an embodiment of a front auxiliary box lock pin synchronizer of an AMT of the utility model;

[0035] Figure 3 It is a structural schematic diagram of a high-gear cone ring assembly in an embodiment of a front auxiliary box lock pin synchronizer of an AMT of the utility model;

[0036] Figure 4 It is a structural schematic diagram of a low-gear cone ring assembly in an embodiment of a front auxiliary box lock pin synchronizer of an AMT of the utility model;

[0037] Figure 5 It is a structural schematic diagram of an elastic locking pin and an elastic locking head in an embodiment of a front auxiliary box lock pin type synchronizer of an AMT of the utility model;

[0038] Figure 6 It is a schematic diagram of the length calculation principle of the elastic locking pin in an embodiment of the front auxiliary box locking pin type synchronizer of an AMT of the utility model.

[0039] In the figure:

[0040] 01-input shaft, 02-high speed differential gear, 03-low speed differential gear;

[0041] 1-sliding sleeve, 2-spoke plate, 21-spoke plate locking hole;

[0042] 3-high gear cone ring assembly, 31-high gear cone ring body; 32-high gear locking pin, 321-high gear locking block, 322-high gear locking rod; 33-high gear locking hole, 34-elastic locking mechanism; 341-elastic locking pin, 342-elastic locking head, 343-locking spring; 35-spring hole;

[0043] 4-low gear cone ring assembly, 41-low gear cone ring body, 42-low gear locking pin, 421-low gear locking block, 422-low gear locking rod, 423-low gear locking ring groove;

[0044] 5-friction surface, 6-locating pin. DETAILED DESCRIPTION

[0045] In order to make the purpose, advantages and features of the utility model clearer, the following is a further detailed description of a front auxiliary box lock pin synchronizer of an AMT proposed by the utility model in combination with the accompanying drawings and specific embodiments. According to the following specific implementation methods, the advantages and features of the utility model will be clearer.

[0046] See also Figure 1-Figure 6In this embodiment, a front auxiliary box lock pin synchronizer of an AMT mainly includes a sliding sleeve 1, a spoke plate 2, a high-speed cone ring assembly 3 and a low-speed cone ring assembly 4.

[0047] See also Figure 1 and Figure 2 The sleeve 1 is slidably mounted on the external input shaft 01, and the spoke plate 2 is fixedly mounted on the sleeve 1 and cooperates with an external shift fork (not shown in the figure). It is used to move the sleeve 1 along the axial direction of the input shaft 01 under the action of the external shift fork, so as to facilitate the cooperation with the high-speed differential gear 02 or the low-speed differential gear 03 respectively, so as to realize the synchronous operation before shifting.

[0048] Specifically, in a preferred embodiment of the present invention, sleeve coupling teeth are respectively provided at both ends of the sleeve 1 for correspondingly meshing with the gear coupling teeth on the external high-speed differential gear 02 or the low-speed differential gear 02; 2N spoke plate locking holes 21 are provided on the end surface of the spoke plate 2 along the circumferential direction; N≥3; in this embodiment, N=3 is taken as an example, that is, the number of the spoke plate locking holes 21 is 6.

[0049] A plurality of connecting grooves are arranged on the inner hole of the spoke plate 2; the connecting grooves are specifically square grooves, and in other embodiments of the utility model, they can also be hexagonal grooves, etc. An annular groove is arranged in the axial middle of the outer circumference of the sleeve 1, and a plurality of connecting grooves are arranged axially on the outer circumference of the sleeve 1; the plurality of connecting grooves penetrate the annular grooves axially. Specifically, in this embodiment, the number of the positioning pins 6, the connecting grooves and the connecting grooves is two for illustration, and the specific number can be set according to actual needs, and three, four, etc. are all possible. The two positioning pins 6, the connecting grooves and the connecting grooves are arranged relatively along the circumferential direction.

[0050] The specific arrangement of the connecting groove and the connecting slot here is the conventional arrangement on the existing lock pin type synchronizer.

[0051] An external spline of the input shaft 01 is arranged on the outer circumferential surface of the input shaft 01, and a corresponding internal spline of the sleeve is arranged on the inner hole of the sleeve 1. The axial length of the external spline of the input shaft 01 is greater than the axial length of the internal spline of the sleeve, which meets the axial movement requirements of the sleeve 1.

[0052] During assembly, the spoke plate 2 is axially mounted on the sleeve 1 so that the spoke plate 2 is placed in the annular groove on the sleeve 1, and then the spoke plate 2 is rotated by a certain angle so that the connection groove on the spoke plate 2 is aligned with the connection groove on the sleeve 1, and then the positioning pin 6 is inserted into the connection groove and the connection groove, so that the spoke plate 2 and the sleeve 1 are connected as a whole. The sleeve 1 is mounted on the input shaft 01 so that the inner spline of the sleeve matches the outer spline of the input shaft, so that the sleeve 1 can move axially along the input shaft 01, and at the same time, it can rotate together with the input shaft 01 to transmit power.

[0053] The high-gear cone ring assembly 3 and the low-gear cone ring assembly 4 are respectively arranged on both sides of the spoke plate 2, and can be used for synchronization of the high-gear differential gear 02 and the low-gear differential gear 03 respectively.

[0054] For details, see Figure 3 The high-gear cone ring assembly 3 includes a high-gear cone ring body 31, three high-gear locking pins 32 arranged on the side of the high-gear cone ring body 31 close to the spoke plate 2 along the circumferential direction, three high-gear locking holes 33 arranged on the end surface of the high-gear cone ring body 31 along the circumferential direction, and three elastic locking mechanisms 34 respectively arranged at the three high-gear locking holes 33. The three high-gear locking pins 32 and the three high-gear locking holes 33 are arranged at intervals along the circumferential direction, and are respectively arranged in one-to-one correspondence with the six spoke plate locking holes 21, and one end of the three high-gear locking pins 32 is placed in the corresponding three spoke plate locking holes 21.

[0055] Among them, because AMT requires a very large number of shifts, if the locking is unreliable, the sliding sleeve 1 and the high-speed differential gear 02 will hit the teeth, which will produce a shift shock on the one hand and have a great impact on the life parameters of the combined teeth on the other hand. Therefore, the locking must be reliable, so the locking spring 343 is set with a large stiffness. The large spring force acts on the elastic locking pin 341, and the force of the elastic locking pin 341 pressing the high-speed locking pin 32 is also very large. Therefore, when the locking is completed, when the locking spring 343 returns to the compressed state of the installation, the impulse to the high-speed locking pin 32 is relatively large, and the impulse transmitted to the high-speed cone ring assembly 3 is also very large. At this time, if the hole where the high-speed locking pin 32 is located is not reasonably set, the hole wall will cause wear / cracks under long-term impact, causing the high-speed cone ring assembly 3 to break from here. Here, the high-gear locking hole 33 on the high-gear cone ring assembly 3 is set as an elliptical hole. Under the premise of ensuring the strength of the high-gear cone ring assembly 3, the elastic locking pin 341 has a smaller impact force when returning to the initial position, thereby alleviating the impact at this location and ensuring the strength of the high-gear cone ring assembly 3.

[0056] To be more specific, in a preferred embodiment of the present invention, the high-gear locking pin 32 includes a high-gear locking block 321 and a high-gear locking rod 322 whose one end is connected to one end of the high-gear locking block 321; the radial dimension of the high-gear locking block 321 is greater than the radial dimension of the high-gear locking rod 322; the other end of the high-gear locking block 321 is connected to the side of the high-gear cone ring body 31 close to the spoke 2; a high-gear locking angle is provided on the end face of one end of the high-gear locking block 321; the spoke locking hole 21 on the spoke 2 corresponding to the high-gear locking pin 32 is adapted to the high-gear locking block 321, and a second spoke locking angle adapted to the high-gear locking angle is provided at the edge of the spoke locking hole 21 on the spoke 2.

[0057] It should be noted that the “first” and “second” in the description of this embodiment are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0058] For more details, see Figure 2 The side wall of the high-speed cone ring body 31 is provided with spring holes 35 at the three high-speed locking holes 33, and the spring holes 35 are connected to the high-speed locking holes 33; the elastic locking mechanism 34 is arranged in the spring hole 35, and its elastic output end is in contact with the end circumference of the low-speed locking pin 42. Figure 2 and Figure 5 The elastic locking mechanism 34 specifically includes an elastic locking pin 341, an elastic locking head 342 whose one end is fixedly connected to one end of the elastic locking pin 341, and a locking spring 343 mounted on the elastic locking pin 341; the diameter of the elastic locking head 342 is larger than the diameter of the elastic locking pin 341, one end of the locking spring 343 abuts against the elastic locking head 342, and the other end abuts against the bottom end of the spring hole 35; the other end of the elastic locking head 342 serves as an elastic output end, abutting against the end peripheral side of the low-gear locking pin 42.

[0059] The transition point between the elastic locking head 342 and the elastic locking pin 341 is where the stress of the elastic locking structure is most concentrated. In order to ensure the strength of the elastic locking pin 341, a fillet needs to be added here to reduce the stress. However, the fillet cannot be too large, and it needs to be ensured to be smaller than the inner diameter of the locking spring 343 to prevent the locking spring 343 from being subjected to the tilting force and causing deflection. The role of the elastic locking pin 341 is to guide and contact with the low-speed locking pin 42. The diameter of the contact end of the elastic locking pin 341 and the locking spring 343 needs to be large enough to block the locking spring 343. The horizontal force applied to the locking spring 343 ensures that the locking spring 343 does not tilt. The length of the elastic locking pin 341 needs to be set within a reasonable range and cannot be too long. When the elastic locking pin 341 tilts, the elastic locking pin 341 cannot contact the hole wall of the spring hole 35, generating a lever force and causing breakage. However, the elastic locking pin 341 cannot be too short. On the one hand, the guiding effect will be reduced, and on the other hand, the upper part of the locking spring 343 will be stressed, causing the locking spring 343 to break.

[0060] See also Figure 6 , when calculating, the low gear locking pin 42 is set at the position after the synchronization is completed, at which time the elastic locking head 342 contacts the low gear locking pin 42, and the maximum length of the elastic locking pin 341 at this time is defined as x; the radial dimension of the part where the radius of the elastic locking head 342 is greater than the radius of the elastic locking pin 341 is b; the maximum inclination angle of the elastic locking pin 341 in the spring hole 35 is α;

[0061] Then, the maximum length x of the elastic locking pin 341 satisfies the following condition: x=b / tanα.

[0062] For details, see Figure 4The low-gear cone ring assembly 4 includes a low-gear cone ring body 41, and three low-gear locking pins 42 arranged along the circumferential direction on the side of the low-gear cone ring body 41 close to the spoke plate 2; the three low-gear locking pins 42 are arranged in a one-to-one correspondence with the three high-gear locking holes 33, and one end of the three low-gear locking pins 42 respectively passes through the corresponding three spoke plate locking holes 21 and is placed in the three high-gear locking holes 33, and respectively forms a locking structure with the corresponding three elastic locking mechanisms 34.

[0063] To be more specific, the low gear locking pin 42 includes a low gear locking block 421 and a low gear locking rod 422 whose one end is connected to the other end of the low gear locking block 421; the radial dimension of the low gear locking block 421 is greater than the radial dimension of the low gear locking rod 422, and the length of the low gear locking rod 422 is greater than the length of the high gear locking rod 322; the other end of the low gear locking block 421 is connected to the side of the low gear cone ring body 41 close to the spoke 2; a low gear locking angle is arranged on the end face of one end of the low gear locking block 421; the spoke locking hole 21 on the spoke 2 corresponding to the low gear locking pin 42 is matched with the low gear locking block 421, and a first spoke locking angle matched with the low gear locking angle is arranged at the edge of the spoke locking hole 21 on the spoke 2.

[0064] The various locking angles in this embodiment are conventional settings on existing lock pin type synchronizers.

[0065] A low-gear locking ring groove 423 is provided around the other end of the low-gear locking rod 422 ; the elastic output end of the elastic locking structure abuts against the low-gear locking ring groove 423 .

[0066] In the process of shifting gears, in order to prevent the synchronizer from falling apart, the three relatively long low-gear locking pins 42 on the low-gear cone ring assembly 4 extend into the elliptical hole of the high-gear cone ring body 31, and the locking spring 343 and the elastic locking pin 341 provided in the elliptical hole radially restrict the low-gear locking pin 42 from coming out of the elliptical hole. At the same time, a low-gear locking ring groove 423 is provided on the circumferential side of the other end of the low-gear locking pin 42 to restrict the elastic locking pin 341 and prevent the elastic locking pin 341 from axially coming out of the high-gear cone ring assembly 3. The low-gear locking ring groove 423 should be as deep as possible on the basis of ensuring strength, so as to prevent the elastic locking pin 341 from coming out of the low-gear locking ring groove 423 after multiple impacts, wearing the low-gear locking ring groove 423, or deflecting to cause the locking spring 343 to break.

[0067] The inner holes of the high-gear cone ring body 31 and the low-gear cone ring body 41 are both set as tapered holes, and the surfaces of the high-gear cone ring body 31 and the low-gear cone ring body 41 located at the corresponding tapered holes are friction surfaces 5, which are used to form a friction pair with the friction cone rings on the external high-gear differential gear 02 and the low-gear differential gear 03. Specifically, the friction surface 5 can be a thread groove or other rough surface.

[0068] During operation (taking high gear as an example), the spoke plate 2 is acted upon by the external shift fork, driving the sleeve 1 to move toward the high gear differential gear 02. During this process, the second spoke plate locking angle at the spoke plate locking hole 21 first contacts and locks with the high gear locking angle on the high gear locking pin 32. At the same time, the friction surface 5 of the high gear cone ring assembly 3 contacts the friction cone ring of the high gear differential gear 02, generating a friction torque M. At this time, the low gear locking pin 42 is forced to push the elastic locking pin 341, and the elastic locking pin 341 compresses the locking spring 343. The locking spring 343 generates a reverse spring force to prevent the high gear cone ring assembly 3 from rotating. When synchronization is completed, the friction torque becomes 0, the high gear cone ring assembly 3 retreats an angle, the sleeve 1 and the spoke plate 2 pass through the high gear locking pin 32, and the outer spline at the upper end of the sleeve 1 meshes with the inner spline on the high gear differential gear 02, so that the high gear differential gear 02 rotates synchronously with the input shaft 01, thereby completing the gear shift.

[0069] The process of shifting down gear is similar and will not be elaborated here.

Claims

1. A front auxiliary box lock pin synchronizer of an AMT, characterized in that: It comprises a sliding sleeve (1), a spoke plate (2), a high-speed cone ring assembly (3) and a low-speed cone ring assembly (4); The sliding sleeve (1) is slidably mounted on the input shaft (01), and the spoke plate (2) is fixedly mounted on the sliding sleeve (1) and cooperates with an external shift fork to shift the sliding sleeve (1) along the axial direction of the input shaft (01) under the action of the external shift fork; Sliding sleeve coupling teeth are respectively arranged at both ends of the sliding sleeve (1) for correspondingly meshing with gear coupling teeth on an external high-speed differential gear (02) or a low-speed differential gear (03); 2N spoke locking holes (21) are arranged on the end surface of the spoke plate (2) along the circumferential direction; N≥3; The high-speed cone ring assembly (3) and the low-speed cone ring assembly (4) are respectively arranged on both sides of the spoke plate (2); The high-gear cone ring assembly (3) comprises a high-gear cone ring body (31), N high-gear locking pins (32) arranged along the circumferential direction on a side of the high-gear cone ring body (31) close to the spoke plate (2), N high-gear locking holes (33) arranged along the circumferential direction on the end surface of the high-gear cone ring body (31), and N elastic locking mechanisms (34) respectively arranged at the N high-gear locking holes (33); N high-gear locking pins (32) and N high-gear locking holes (33) are arranged at intervals along the circumferential direction and are arranged one-to-one corresponding to the 2N spoke plate locking holes (21), and one end of the N high-gear locking pins (32) is placed in the corresponding N spoke plate locking holes (21); The high gear locking hole (33) is an elliptical hole; The low-gear cone ring assembly (4) comprises a low-gear cone ring body (41) and N low-gear locking pins (42) arranged along the circumferential direction on one side of the low-gear cone ring body (41) close to the spoke plate (2); The N low-gear locking pins (42) are arranged in one-to-one correspondence with the N high-gear locking holes (33); one end of the N low-gear locking pins (42) respectively passes through the corresponding N spoke plate locking holes (21) and is placed in the N high-gear locking holes (33), and respectively forms an elastic locking structure with the corresponding N elastic locking mechanisms (34); The inner holes of the high-gear cone ring body (31) and the low-gear cone ring body (41) are both configured as cone holes, and the surfaces of the high-gear cone ring body (31) and the low-gear cone ring body (41) located at the cone holes are both friction surfaces (5) for correspondingly cooperating with the friction cone rings on the end faces of the external high-gear differential gear (02) and the low-gear differential gear (03) to form a friction pair.

2. The front auxiliary box lock pin synchronizer of AMT according to claim 1, characterized in that: Spring holes (35) are respectively arranged at the N high-gear locking holes (33) on the side wall of the high-gear cone ring body (31); The spring hole (35) is correspondingly connected to the high-gear locking hole (33); the elastic locking mechanism (34) is arranged in the spring hole (35), and its elastic output end abuts against the end circumference of the low-gear locking pin (42) to form an elastic locking structure.

3. The front auxiliary box lock pin synchronizer of AMT according to claim 2, characterized in that: The elastic locking mechanism (34) comprises an elastic locking pin (341), an elastic locking head (342) one end of which is fixedly connected to one end of the elastic locking pin (341), and a locking spring (343) sleeved on the elastic locking pin (341); The diameter of the elastic locking head (342) is greater than the diameter of the elastic locking pin (341); one end of the locking spring (343) abuts against the elastic locking head (342), and the other end abuts against the bottom end of the spring hole (35); the other end of the elastic locking head (342) serves as an elastic output end, abutting against the end circumference of the low-speed locking pin (42).

4. The front auxiliary box lock pin synchronizer of AMT according to claim 3, characterized in that: The maximum length of the elastic locking pin (341) is defined as x, the radial dimension of the portion of the elastic locking head (342) whose radius is greater than the radius of the elastic locking pin (341) is defined as b, and the maximum inclination angle of the elastic locking pin (341) in the spring hole (35) is defined as α; Then, the maximum length x of the elastic locking pin (341) satisfies the following conditions: x = b / tanα.

5. A front auxiliary box lock pin synchronizer of an AMT according to any one of claims 1 to 4, characterized in that: The low gear locking pin (42) comprises a low gear locking block (421) and a low gear locking rod (422) one end of which is connected to one end of the low gear locking block (421); The radial dimension of the low-gear locking block (421) is greater than the radial dimension of the low-gear locking rod (422), and the length of the low-gear locking rod (422) is greater than the length of the high-gear locking rod (322); one end of the low-gear locking block (421) is connected to a side of the low-gear cone ring body (41) close to the spoke plate (2); The spoke plate locking hole (21) corresponding to the spoke plate (2) and the low-gear locking pin (42) is adapted to the low-gear locking block (421).

6. The front auxiliary box lock pin synchronizer of AMT according to claim 5, characterized in that: A low-gear locking ring groove (423) is provided on the circumferential side of the other end of the low-gear locking rod (422); and the elastic output end of the elastic locking mechanism (34) abuts against the low-gear locking ring groove (423).

7. The front auxiliary box lock pin synchronizer of AMT according to claim 6, characterized in that: The high-speed locking pin (32) comprises a high-speed locking block (321) and a high-speed locking rod (322) one end of which is connected to one end of the high-speed locking block (321); The radial dimension of the high-gear locking block (321) is greater than the radial dimension of the high-gear locking rod (322); one end of the high-gear locking block (321) is connected to a side of the high-gear cone ring body (31) close to the spoke plate (2); The spoke plate locking hole (21) corresponding to the spoke plate (2) and the high-speed locking pin (32) is adapted to the high-speed locking block (321).

8. The front auxiliary box lock pin synchronizer of AMT according to claim 1, characterized in that: The spoke plate (2) and the sliding sleeve (1) are fixedly connected via a plurality of positioning pins (6).

9. The front auxiliary box lock pin synchronizer of AMT according to claim 8, characterized in that: The number of the positioning pins (6) is two, and they are arranged opposite to each other along the circumferential direction.

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