Automatic angle positioning gear shifting system

Abstract

The invention relates to the technical field of canine tooth gear shifting mechanisms, in particular to an automatic angle positioning gear shifting system which comprises a gear position gear and a gear hub, the gear position gear is provided with a plurality of positioning bosses and canine teeth I from inside to outside in the radial direction, and the positioning bosses and the canine teeth I are arranged on the gear position gear. A plurality of first canine teeth and a plurality of positioning bosses are evenly arranged in the circumferential direction of the gear, a plurality of second canine teeth are evenly arranged on the gear hub in the circumferential direction, the second canine teeth and the first canine teeth are meshed or separated after rotating, a switching spline is arranged in the center of the gear hub, first sliding assemblies are symmetrically arranged on the gear hub between the switching spline and the second canine teeth, and second sliding assemblies are symmetrically arranged on the gear hub between the switching spline and the second canine teeth. A first sliding assembly is arranged in the switching spline and abuts against the positioning boss, a second sliding assembly is arranged at the position, corresponding to the first sliding assembly, in the switching spline, and the first sliding assembly abuts against the adjacent second sliding assembly in a sliding mode. Finally, a novel canine tooth gear shifting system which is free of tooth hitting and capable of entering a gear at a time is constructed.

Description

Technical Field

[0001] The invention relates to the technical field of dog gear shifting mechanisms, and in particular to an automatic angle positioning shifting system. Background Art

[0002] The shift actuator is the most critical mechanism for the automobile transmission to realize the shift function. Among various types of shift mechanisms, the canine gear shift mechanism has been widely used due to its simple structure, reliable performance and low cost. However, due to its own structural characteristics, the relative angle between the gear gear and the gear hub is a random event during the shifting process. Therefore, this type of shift mechanism cannot achieve the level of 100% one-time gear shifting, and there is always a probability of gear hitting. This inevitable gear hitting will not only affect the smoothness of the shifting, but also bring abnormal impact loads to the various components of the shift mechanism, thereby reducing the reliability and fatigue performance of the shift structure. This effect is particularly prominent for the canine teeth that are directly subjected to the impact, and in severe cases, it may even cause early damage to the canine teeth. Therefore, how to improve the success rate of one-time gear shifting of similar shift mechanisms is a problem worth considering. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides an automatic angle positioning shifting system to achieve the purpose of improving the success rate of one-time gear shifting of the shifting mechanism.

[0004] The present invention is achieved through the following technical solutions:

[0005] An automatic angle positioning shifting system comprises a gear gear and a gear hub, wherein the gear gear is provided with a positioning boss and a dog tooth 1 respectively along the radial direction from the inside to the outside, wherein a plurality of positioning bosses and a plurality of dog teeth 1 are provided, and the plurality of dog teeth 1 and the plurality of positioning bosses are evenly arranged along the circumferential direction of the gear gear respectively, and the gear hub is evenly provided with a plurality of dog teeth 2 along the circumferential direction, and the dog teeth 2 are engaged or separated with the dog teeth 1 after rotation, and a transfer spline is provided at the center of the gear hub, and a sliding component 1 is symmetrically provided on the gear hub between the transfer spline and the dog teeth 2, and the sliding component 1 is abutted against the positioning boss, and a sliding component 2 is provided at a place corresponding to the sliding component in the transfer spline, and the sliding component 1 is slidably abutted against the adjacent sliding component 2.

[0006] Further preferably, the positioning boss is arranged at an angular position between two adjacent canine teeth, and both sides of the positioning boss have inclined surfaces.

[0007] Further preferably, the sliding component 1 includes a sliding sleeve mounting position, in which a sliding block 1 and a spring 1 are arranged, one end of the spring 1 is connected to the sliding sleeve mounting position, the other end of the spring 1 is connected to the sliding block 1, and the end of the sliding block 1 away from the spring 1 passes through the sliding sleeve mounting position and slides into contact with the positioning boss.

[0008] Further preferably, the slider 1 includes an inner component and an outer component that are connected to each other, the inner component is connected to the spring 1 in the sleeve mounting position, a pressure plate is provided at the opening of the sleeve mounting position, one end of the outer component passes through the sleeve mounting position and the pressure plate, and the outer component is provided with inclined surfaces 3 on both sides of the end that passes through the sleeve mounting position, and the inclined surface 3 is slidably abutted against the inclined surface 1 of the positioning boss.

[0009] Further preferably, a sliding sleeve is provided between the sliding sleeve installation position and the inner component, the inner component is slidably connected to the sliding sleeve, a sliding portion passing through the sliding sleeve is provided at the bottom of the inner component, and the sliding portion is slidably connected to the sliding assembly 2.

[0010] Further preferably, the sliding component 2 includes a slider 2 mounting position, which is connected to the sleeve mounting position, and a spring 2 and a slider 2 are installed in the slider 2 mounting position, the bottom end of the spring 2 is connected to the slider 2 mounting position, the top end of the spring 2 is connected to the slider 2, a limiting groove is provided at the bottom of the sleeve, and the slider 2 passes through the slider 2 mounting position and is movably connected to the limiting groove.

[0011] Further preferably, the sliding portion is provided with a second inclined plane at one end away from the outer member, and a fourth inclined plane is provided on the right side of the top end of the sliding block 2, and the second inclined plane is in sliding contact with the fourth inclined plane.

[0012] Further preferably, the shift axial force F>minimum shift force F min , F min =2hmr 2 / (α-β) 2

[0013] Where, m is the mass of the gear hub system;

[0014] r—the speed difference between the gear hub and the gear;

[0015] h—the distance between the top surface of the second canine tooth of the gear hub and the top surface of the first canine tooth of the gear in gear state;

[0016] Window period T w =(α-β) / r;

[0017] The above F min and T w In the figure, α is the central angle of the gap between two adjacent canine teeth, and β is the central angle of the canine tooth in the circumferential direction of the gear.

[0018] Further preferably, the shortest shift time T min =sqrt(2Lm / F)+sqrt(2mh / F)+(β-θ / 2) / r;

[0019] The longest shift time T max =sqrt(2Lm / F)+sqrt(2hm / F)+(α+2β-θ / 2) / r;

[0020] Among them, θ is the central angle span of the top surface of the positioning boss;

[0021] L is the axial distance between the left end face of the second slider and the limit surface in the neutral state.

[0022] Beneficial effects of the present invention:

[0023] 1. The present invention designs a novel gear shift execution system. By setting a locking-unlocking mechanism, the gear shifting motion is decomposed into three processes: preparatory gear shifting, unlocking, and formal gear shifting. On this basis, angle positioning is set to provide real-time feedback on the relative angle position between the gear and the gear hub, and the unlocking function is given to the angle positioning. Then, by coordinating the position between the canine tooth 1 on the gear and the positioning boss, and the position between the canine tooth 2 on the gear hub and the sliding component 1 and the sliding component 2, the unlocking in the gear shifting process is triggered only at the best time, and finally a novel canine gear shifting system with no tooth-striking and 100% one-time gear engagement rate is constructed.

[0024] 2. The present invention provides a method for calculating key performance parameters in the gear shift design based on the relative motion law of the components, so as to achieve the purpose of parameterized design optimization. The present invention ultimately constructs a new type of parameterizable dog gear shift system with no tooth play, 100% one-time gear shifting rate (both positive and negative speed differences are possible).

[0025] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is a three-dimensional structural schematic diagram of the shifting system of the present invention.

[0028] Figure 2 It is a three-dimensional structural schematic diagram of the gear in the present invention.

[0029] Figure 3 It is a structural schematic diagram of the gear gear in the present invention.

[0030] Figure 4 It is a three-dimensional structural schematic diagram of the gear hub in the present invention.

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the gear hub without the transfer spline in the present invention.

[0032] Figure 6 It is a structural schematic diagram of the gear hub in the present invention.

[0033] Figure 7 It is a three-dimensional structural schematic diagram of the transfer spline in the present invention.

[0034] Figure 8 It is a schematic diagram of the broken structure of the transfer spline in the present invention.

[0035] Fig. 9 It is a three-dimensional structural schematic diagram of the sliding sleeve in the present invention.

[0036] Fig.10 It is a structural schematic diagram of the sliding sleeve in the present invention.

[0037] Fig.11 It is a schematic diagram of the three-dimensional structure of the pressure plate in the present invention.

[0038] Fig.12 It is a three-dimensional structural schematic diagram of a slider 1 in the present invention.

[0039] Fig.13 It is a structural schematic diagram of a slider 1 in the present invention.

[0040] Fig.14 It is a schematic diagram of the three-dimensional structure of the slider 2 in the present invention.

[0041] Fig.15 It is a schematic structural diagram of the shifting system of the present invention in a neutral state.

[0042] Fig.16 It is a schematic structural diagram of the gear shifting system of the present invention in a preparatory state.

[0043] Fig.17 It is a schematic structural diagram of the shift system of the present invention in an unlocked state.

[0044] Fig.18 It is a schematic structural diagram of the shifting system of the present invention in a gear state.

[0045] Fig.19 It is a schematic structural diagram of four states of the shifting system of the present invention.

[0046] 1-shift gear, 2-gear hub, 3-dog tooth 1, 4-locating boss, 5-inclined surface 1, 6-dog tooth 2, 7-transfer spline, 8-slider 2 mounting position, 9-spring 2, 10-slider 2, 11-inclined surface 4, 12-sleeve mounting position, 13-sleeve, 14-slider 1, 15-spring 1, 16-inner component, 17-outer component, 18-pressure plate mounting position, 19-pressure plate, 20-sliding part, 21-inclined surface 2, 22-inclined surface 3, 23-limiting groove, 24-limiting surface, 25-shift slider. DETAILED DESCRIPTION

[0047] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0048] An automatic angle positioning shifting system comprises a gear 1 and a gear hub 2. A plurality of dog teeth 3 and positioning bosses 4 are evenly arranged in the circumference of the gear 1. The plurality of positioning bosses 4 are evenly distributed in the circumference close to the center of the gear 1, and the plurality of dog teeth 3 are evenly distributed in the circumference far from the center of the gear 1, that is, the plurality of positioning bosses 4 are close to the center of the circle relative to the plurality of dog teeth 3, a positioning boss 4 is arranged at the position of the middle angle between every two dog teeth 3, the positioning boss 4 adopts a bevel transition, that is, the top surface of the positioning boss 4 is a plane, and the two sides along the circumferential direction are bevels 5, the central angle of the gap between two adjacent dog teeth 3 is α, and the thickness of the dog teeth 3, that is, the central angle of the dog teeth 3 in the circumferential direction of the gear 1 is β.

[0049] For the gear hub 2, a plurality of canine teeth 2 6 corresponding to the canine teeth 1 3 are provided on the gear hub 2. The distribution of the canine teeth 2 6 is consistent with the canine teeth 1 3 on the gear gear 1. The canine teeth 1 3 and the canine teeth 2 6 can be meshed after rotation. A transfer spline 7 is slidably provided at the center of the gear hub 2. A sliding component 2 is symmetrically provided on the transfer spline 7. The sliding component 2 includes a slider 2 mounting position 8. The slider 2 mounting position 8 is set at the corresponding middle position between the two canine teeth 2 6. The opening of the slider 2 mounting position 8 faces the gear hub 2. A spring 2 9 and a slider 2 10 are installed in the slider 2 mounting position 8. The bottom end of the spring 2 9 is connected to the slider 2 mounting position 8, and the top end of the spring 2 9 is connected to the slider 2 10. The slider 2 10 can move up and down in the slider 2 mounting position 8 and pass through the slider 2 mounting position 8. A slope 4 11 is provided on the right side of the top of the slider 2 10.

[0050] A sliding assembly 1 is symmetrically arranged on the gear hub 2 between the transfer spline 7 and the dog tooth 2 6, and each sliding assembly 1 includes a sleeve mounting position 12, and the two sleeve mounting positions 12 are respectively arranged outside the two slider 2 mounting positions 8, that is, the sleeve mounting position 12 is also at the middle angle position between the two dog teeth 2 6, and the sleeve mounting position 12 is connected with the corresponding slider 2 mounting position 8, that is, the slider 2 10 can be telescopically entered into the sleeve mounting position 12, and each sleeve mounting position 12 is provided with a sleeve 13, a slider 14 and a spring 15, one end of the spring 15 is connected to the sleeve mounting position 12, and the other end of the spring 15 is connected to the slider 14, and the slider 14 includes an inner part 16 and an outer part 17, and the inner part 16 is in the sleeve mounting position 12 The outer part 17 is connected to the spring 15, and passes through the sleeve mounting position 12. After the gear hub 2 and the shift gear 1 rotate, they can abut against the inclined surface 5 and the top surface of the positioning boss 4. A pressure plate mounting position 18 is provided at the opening of the sleeve mounting position 12. A pressure plate 19 is provided in the pressure plate mounting position 18 for pressing the inner part 16 of the slider 14. The pressure plate 19 has a hole through which the outer part 17 of the slider 14 passes. A sliding part 20 is provided at the bottom of the inner part 16. The sliding part 20 is provided with an inclined surface 21 at the end away from the outer part 17. The inclined surface 21 and the inclined surface 4 11 can slide relative to each other. The outer part 17 is provided with inclined surfaces 3 22 on both sides of the end away from the inner part 16. The inclined surface 3 22 can contact and slide relative to the inclined surface 5 of the positioning boss 4.

[0051] The sliding sleeve 13 is installed between the sliding sleeve installation position 12 and the slider 14. The slider 14 slides relatively in the sliding sleeve. The bottom of the sliding sleeve 13 has an opening for the sliding part 20 of the inner part 16 to slide out. After the sliding part 20 passes through the sliding sleeve 13, its lower end surface can contact the top end surface of the slider 2 10 and slide relatively. At the same time, the inclined surface 21 and the inclined surface 4 11 slide relatively. A limiting groove 23 is provided at the bottom of the sliding sleeve 13. The limiting groove 23 is used to limit the slider 2 10 in the sliding sleeve installation position 12. The side surface of the limiting groove 23 close to the bottom surface on the left side of the sliding sleeve installation position 12 is a limiting surface 24, which limits the sliding position of the slider 2 10 to the left.

[0052] In the neutral state, the gear hub is in the middle axial position of the transfer spline 7, the right axial end face of the inner part 16 of the slider 14 is tightly fitted with the pressure plate 19 under the preload force of the spring 15, the slider 2 10 is tightly fitted with the lower end face of the slider 14 under the preload force of the spring 29, and the axial distance L between the left end face of the slider 2 10 and the limit face 24 at the bottom of the sliding sleeve 13 is L, and the system is in the unlocked state. At this time, ensure that there is enough clearance between the right end face of the outer part 17 of the slider 14 and the positioning boss 4 on the gear gear 1 to avoid neutral wear.

[0053] When the shifting action starts, under the action of the shifting force F, the shifting slider 25 pushes the gear hub 2 and moves axially to the right with the sliding sleeve 13, the spring 15 and the pressure plate 19. At this time, there are two situations:

[0054] In the first case (high probability), the slider 14 is in the unlocked position (the unlocked position of the slider 14 is: when the axial projection of the right end face of the outer component 17 of the slider 14 overlaps with the axial projection of the end face of any positioning boss 4 on the gear 1, all other positions are unlocked positions), the slider 14 moves to the right with the sleeve 13. During this process, the contact state between the slider 14 and the slider 2 10 will be transformed into the contact between the inclined surface 21 and the inclined surface 4 11. The slider 2 10 moves radially outward under the action of the preload of the spring 29. The movement of block 2 10 will move until its left end face is in contact with the limiting surface 24 at the bottom of the sleeve 13. At this time, the axial rightward movement of the sleeve 13 (including the gear hub 2, spring 15, slider 14, pressure plate 19, and shift slider 25) will be constrained. In this case, the system shift enters a preparatory state. In this state, the axial position of the right end face of the outer component 17 of the slider 14 will be located a certain distance below the top surface of the positioning boss 4 on the gear gear 1, and it is necessary to ensure that the canine tooth 2 6 of the gear hub 2 and the canine tooth 1 3 of the gear gear 1 maintain sufficient axial clearance to avoid tooth knocking.

[0055] In the second case (low probability), when the slider 14 is just in the unlocked position, the slider 14 cannot continue to move to the right axially because the right end face of the outer component 17 is restricted by the positioning boss 4 and will maintain the axial position. The system is still in the unlocked state, so the gear hub 2 (including the sliding sleeve 13, spring 15, pressure plate 19, shift slider 25) performs the subsequent gear shifting action according to the movement mode in the unlocked state as described below.

[0056] Due to the speed difference (i.e., relative speed) between the gear hub 2 system and the shift gear 1, the slider 14 rotates toward the positioning boss 4, and under the joint action of the right side inclined surface of its outer component 17 (symmetrically designed to cope with the positive and negative speed difference) and the inclined surface 15 of the positioning boss 4, the slider 14 will produce axial leftward movement, and under the action of the preload force of the spring 15, it moves until the right end surface of the outer component 17 is in contact with the top surface of the positioning boss 4. Due to the inclined surface action relationship between the inclined surface 21 and the inclined surface 4 11 and the action of the spring 29, the process will be accompanied by the radial inward movement of the slider 2 10, and move until the upper end surface of the slider 2 10 is in contact with the lower end surface of the slider 14. At this time, the left end surface of the slider 2 10 separates from the limiting surface 24 at the lower end of the sleeve 13 and moves to the left, the axial rightward locking state is released, and the system enters the unlocked state again.

[0057] After entering the unlocked state, under the action of the shifting force, the gear hub 2 (including the sliding sleeve 13, spring 15, pressure plate 19, and shifting slider 25) will restart the gear shifting action to the right, and the radial position limit of the slider 2 10 will gradually switch from the slider 14 to the lower end surface of the sliding sleeve 13 along with the axial movement. At the same time, since the slider 14 is located at the middle angle position of the two gear hub dog teeth 2 6, and the positioning boss 4 is also located at the middle angle position of the two gear gear 1 dog teeth 3, it can be ensured that when the axial rightward locking is released, the gear hub dog teeth 2 6 and the gear gear 1 dog teeth 3 are in an aligned position, and fit together under the action of the shifting force. Afterwards, due to the existence of the speed difference, the gear hub dog teeth 2 6 and the gear gear 1 dog teeth 3 will gradually stagger, and when they stagger to the angle of the tooth thickness center angle of one dog tooth 3, the window period of the shifting axial movement can be entered.

[0058] During the window period, the gear hub 2 (including the sliding sleeve 13, spring 15, pressure plate 19, and shift slider 25) moves to the axial in-gear position, in which the distance between the top surface of the canine tooth 2 6 of the gear hub 2 and the top surface of the canine tooth 1 3 of the shift gear 1 is h. Driven by the speed difference, the canine tooth 2 6 of the gear hub 2 and the canine tooth 1 3 of the shift gear 1 finally mesh with each other, and at this time, the relative positions of the slider 14 and the positioning boss 4 are staggered, reaching the in-gear state.

[0059] Ensure that the shift axial force F> minimum shift force F min Under the driving conditions, a 100% one-time gear shifting success rate can be guaranteed (same for forward and reverse directions), and no gear knocking will occur.

[0060] Assuming that the influence of friction and part clearance tolerance is not considered, and the influence of spring preload is ignored, the window period T w and minimum shift force F min It can be calculated based on relevant design parameters, and the relevant formula is as follows:

[0061] F min =2hmr 2 / (α-β) 2

[0062] m——The mass of the gear hub 2 system (including the gear hub 2, slider 14, spring 15, sleeve 13, pressure plate 19 and other accessories on the gear hub 2)

[0063] r——the speed difference between gear hub 2 and gear 1

[0064] α——the central angle of the gap between two adjacent canine teeth

[0065] β——Central angle of canine tooth 3 in the circumferential direction of gear 1

[0066] h—the distance h between the top surface of the canine tooth 26 of the gear hub 2 and the top surface of the canine tooth 13 of the gear 1 in the gear state

[0067] T w =(α-β) / r.

[0068] When the design determines the shift axial force F(F>F min ) can also be calculated based on the above-mentioned relevant design parameters to determine the gear shift time range, and the corresponding shortest gear shift time T min , the longest shift time T max The relevant formula for calculation is as follows:

[0069] T min =sqrt(2Lm / F)+sqrt(2mh / F)+(β-θ / 2) / r

[0070] T max =sqrt(2Lm / F)+(α+β-θ) / r+(β+θ / 2) / r+sqrt(2mh / F)

[0071] =sqrt(2Lm / F)+sqrt(2hm / F)+(α+2β-θ / 2) / r

[0072] m——The mass of the gear hub 2 system (including the gear hub 2, slider 14, spring 15, sleeve 13, pressure plate 19 and other accessories on the gear hub 2)

[0073] r——the speed difference between gear hub 2 and gear 1

[0074] θ——the central angle span of the top surface of the positioning boss 4

[0075] L——The axial distance between the left end face of the slider 2 10 and the limit surface 24 in the neutral state.

[0076] When it is necessary to shift back, the gear hub 2 (including the sliding sleeve 13, the spring 15, the pressure plate 19, and the shift slider 25) moves axially to the left under the action of the shift back force, and the system is always in the unlocked state, and the shifting action can be completed smoothly.

[0077] This scheme designs a new type of shift execution system. Through the coordinated matching of sliding component 1 and sliding component 2 and related limit features, a locking-unlocking mechanism with dual functions of angle positioning and triggering unlocking is constructed, which successfully decomposes the shift process into 3 processes (preparatory shift → unlocking → formal shift) and 4 states (neutral state, preparatory state, unlocking state, and in-gear state). On this basis and according to the structural characteristics of the gear 1 and the gear hub 2, the position of the lock-unlocking is reasonably set, so that each unlocking in the shift process is only triggered at the best time, thereby achieving the purpose of maximizing the window period for each shift, thus avoiding the occurrence of random events in the traditional shift structure. In addition, the present invention provides a calculation method for key performance parameters in the shift design based on the relative motion law of the components, so as to achieve the purpose of realizing parameterized design optimization. The present invention finally constructs a new type of canine gear shift system with no tooth collision, a one-time gear entry rate of 100% (both positive and negative speed differences), and can be parameterized.

[0078] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. An automatic angle positioning shifting system, characterized in that: The invention comprises a gear (1) and a gear hub (2), wherein the gear (1) is provided with a positioning boss (4) and a dog tooth (3) from the inside to the outside in the radial direction, respectively, and the positioning boss (4) and the dog tooth (3) are both provided in plurality, and the plurality of dog teeth (3) and the plurality of positioning bosses (4) are respectively evenly arranged along the circumferential direction of the gear (1), and the gear hub (2) is evenly provided with a plurality of dog teeth (6) along the circumferential direction, and a transfer spline (7) is provided at the center of the gear hub (2), and a sliding component (1) is symmetrically provided on the gear hub (2) between the transfer spline (7) and the dog tooth (6), and the sliding component (1) is in contact with the positioning boss (4), and a sliding component (2) is provided at a position corresponding to the sliding component in the transfer spline (7), and the sliding component (1) and the adjacent sliding component (2) are in sliding contact with each other.

2. The automatic angle positioning shifting system according to claim 1, characterized in that: The positioning boss (4) is arranged at an angular position between two adjacent canine teeth (3), and both sides of the positioning boss (4) have inclined surfaces (5).

3. The automatic angle positioning shifting system according to claim 2, characterized in that: The sliding assembly 1 comprises a sliding sleeve mounting position (12), wherein a sliding block 1 (14) and a spring 1 (15) are arranged in the sliding sleeve mounting position (12), one end of the spring 1 (15) is connected to the sliding sleeve mounting position (12), and the other end of the spring 1 (15) is connected to the sliding block 1 (14), and one end of the sliding block 1 (14) away from the spring 1 (15) passes through the sliding sleeve mounting position (12) and slides against the positioning boss (4).

4. The automatic angle positioning shifting system according to claim 3, characterized in that: The slider (14) comprises an inner part (16) and an outer part (17) connected to each other. The inner part (16) is connected to the spring (15) in the sleeve mounting position (12). A pressure plate (19) is provided at the opening of the sleeve mounting position (12). One end of the outer part (17) passes through the sleeve mounting position (12) and the pressure plate (19). The outer part (17) is provided with inclined surfaces (22) on both sides of the end passing through the sleeve mounting position (12). The inclined surface (22) is in sliding contact with the inclined surface (5) of the positioning boss (4).

5. The automatic angle positioning shifting system according to claim 4, characterized in that: A sliding sleeve (13) is further provided between the sliding sleeve installation position (12) and the inner component (16), the inner component (16) is slidably connected to the sliding sleeve (13), a sliding portion (20) penetrating the sliding sleeve (13) is provided at the bottom of the inner component (16), and the sliding portion (20) is slidably connected to the second sliding component.

6. The automatic angle positioning shifting system according to claim 5, characterized in that: The sliding assembly 2 comprises a slider 2 mounting position (8), the slider 2 mounting position (8) being connected to the sleeve mounting position (12), a spring 2 (9) and a slider 2 (10) being installed in the slider 2 mounting position (8), the bottom end of the spring 2 (9) being connected to the slider 2 mounting position (8), the top end of the spring 2 (9) being connected to the slider 2 (10), a limiting groove (23) being provided at the bottom of the sleeve (13), a limiting surface (24) being provided on the left side of the limiting groove (23), and the slider 2 (10) passing through the slider 2 mounting position (8) and being movably connected to the limiting groove (23).

7. The automatic angle positioning shifting system according to claim 6, characterized in that: The sliding part (20) is provided with a second inclined surface (21) at one end away from the outer part (17), and the right side of the top end of the second sliding block (10) is provided with a fourth inclined surface (11), and the second inclined surface (21) is in sliding contact with the fourth inclined surface (11).

8. The automatic angle positioning shifting system according to claim 7, characterized in that: Shift axial force F> minimum shift force F min , F min =2hmr 2 / (α-β) 2 Where, m is the mass of the gear hub (2) system; r—the speed difference between the gear hub (2) and the gear (1); h—the distance between the top surface of the second canine tooth (6) of the gear hub (2) and the top surface of the first canine tooth (3) of the gear (1) in the gear state; Window period T w =(α-β) / r; The above F min and T w In the figure, α is the central angle of the gap between two adjacent dog teeth (3), and β is the central angle of the dog tooth (3) in the circumferential direction of the gear (1).

9. The automatic angle positioning shifting system according to claim 8, characterized in that: Shortest gear shift time T min =sqrt(2Lm / F)+sqrt(2mh / F)+(β-θ / 2) / r; The longest shift time T max =sqrt(2Lm / F)+sqrt(2hm / F)+(α+2β-θ / 2) / r; Wherein, θ is the central angle span of the top surface of the positioning boss (4); L is the axial distance between the left end surface of the second slide block (10) and the limit surface (24) in the neutral state.

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