Electric gear shifting system and vehicle

Abstract

The utility model relates to an electric gear shifting system and a vehicle. The electric gear shifting system comprises a gear shifting actuator, a shifting fork shaft and a gear shifting fork. The gear shifting actuator is provided with a shifting block capable of doing rotary motion, the shifting block is movably connected with a gear shifting fork, and the gear shifting fork is arranged on a shifting fork shaft in an axially moving and sleeving mode. The rotating motion of the shifting block is used for pushing the gear shifting fork to axially move on the shifting fork shaft, and the gear shifting fork is used for pushing the gear sleeve to axially move so as to achieve gear shifting.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle power system technical field especially relates to a kind of electric gear shifting system and vehicle. BACKGROUND

[0002] At present, there are four types of selection for electric gear shifting mechanism: space cam and rotating shift fork, ball screw and translational shift fork, gear rack and translational shift fork, rotating shift finger and translational shift fork. These mechanisms are driven by gear shifting motor, which makes the engagement sleeve move on the pinion shaft, thereby realizing gear shifting. However, most of the existing gear shifting systems adopt linear motion transmission mode, which cannot effectively cope with the resistance changes that may occur during gear shifting, resulting in excessive rigidity during gear shifting. This not only affects the comfort of gear shifting, but also may cause system overload damage when encountering abnormal resistance.

[0003] In market applications, gear rack type gear shifting mechanism is relatively common, but gear rack transmission system requires precise installation and adjustment. Improper installation may lead to a decrease in transmission accuracy, even cause other faults, and affect overall gear shifting performance. Therefore, this gear shifting mechanism has high requirements for installation and maintenance.

[0004] In some existing electric gear shifting mechanisms, a locking hole and a spring positioning pin are provided between the shift fork and the shift fork shaft. Although this structure can achieve positioning function, there is a potential risk of the positioning pin falling out. When the positioning pin falls out, it not only causes gear shifting failure, but also makes the fallen positioning pin become a foreign object, causing wear and damage to the transmission system inside the gearbox. In this design, the end of the shift fork shaft can move axially within the housing, and the spring pin inside the housing extends into the locking hole to achieve positioning. In addition, this mechanical positioning method lacks intelligent monitoring capability and cannot respond to abnormal situations that may occur during gear shifting in a timely manner.

[0005] In traditional gear shifting mechanisms, the design of shift fork structure also faces challenges. Many gear shifting forks are designed asymmetrically, which causes uneven force on the two prongs of the shift fork during the process of pushing the synchronous gear sleeve, resulting in excessive additional bending moment. This uneven force state hinders the smooth movement of the synchronous gear sleeve, causing an increase in gear shifting force and making gear shifting not smooth. In severe cases, it may even fail to engage the gear position. At the same time, the strength design of conventional shift fork structure is often not reasonable, and deformation or fracture may occur under high load conditions.

[0006] Therefore, there is an urgent need to design an electric gear shifting system that is easy to install, maintain and reliable, to meet the needs of electric vehicle transmission system and achieve smooth gear shifting and stable and reliable operation of the system. SUMMARY

[0007] The utility model discloses an electric gear shifting system and car, aims at solving the technical problem existing in prior art.

[0008] The utility model adopts following technical scheme:

[0009] One aspect, the utility model discloses an electric gear shifting system, including gear shifting executor, fork shaft and gear shifting fork,

[0010] Gear shifting executor is equipped with the knob of rotatory motion, and the knob is movably connected with gear shifting fork, and gear shifting fork is movably sleeved on fork shaft in the axial direction,

[0011] The rotatory motion of knob is used to push gear shifting fork to move in the axial direction on fork shaft, and gear shifting fork is used to push the axial movement of tooth cover, to realize gear shifting.

[0012] As preferred technical scheme, the rotatory motion of knob is pendulum motion, and gear shifting executor also includes gear shifting motor, ball screw, ball nut, and ball nut is connected with knob,

[0013] Gear shifting motor is used to drive ball screw, makes the axial motion of ball nut along ball screw, and drives knob to do pendulum motion.

[0014] As preferred technical scheme, the motion reverse conversion mechanism is equipped between ball nut and knob, is used to convert the forward motion of ball nut into the backward motion of knob driving gear shifting fork, or converts the backward motion of ball nut into the forward motion of knob driving gear shifting fork.

[0015] As preferred technical scheme, the motion reverse conversion mechanism includes drive plate and first guide slot, and drive plate is set up on ball nut and extends to the direction of knob, and first guide slot is set up on knob, and the two sides of first guide slot are configured as arc surface, and one end of drive plate is inserted into first guide slot, and the two sides of drive plate are respectively equipped with the gap between the two arc surfaces of first guide slot,

[0016] When ball nut drives drive plate to do forward motion, drive plate and the arc surface of the front side of first guide slot abut, and the linear motion of ball nut is converted into the pendulum motion of knob rotating backward.

[0017] As preferred technical scheme, the bottom of knob is equipped with connecting arm, and connecting arm is equipped with the structure of narrowing in the waist, and the top of gear shifting fork is equipped with second guide slot, and the top of second guide slot is equipped with sector open mouth,

[0018] When knob rotates backward and does pendulum motion, the bottom of connecting arm abuts with second guide slot, and the structure of narrowing in the waist cooperates with sector open mouth, to drive gear shifting fork to move in the axial direction backward,

[0019] Or, when the dial head rotates forward to make a pendulum movement, the driving shift fork makes forward axial movement.

[0020] As a preferred technical solution, the shift actuator is provided with an angle position sensor, and the dial head is provided with a magnetic element corresponding to the angle position sensor, and the rotation angle of the magnetic element is consistent with the rotation angle of the dial head.

[0021] The angle position sensor is used for monitoring the rotation angle of the magnetic element and determining the displacement of the shift fork.

[0022] As a preferred technical solution, the fork shaft is fixedly installed on the housing of the electric gear shifting system.

[0023] As a preferred technical solution, the shift fork is provided with fork legs on two sides, and the fork legs are configured in a symmetrical structure, so that the two sides of the shift fork can be uniformly stressed.

[0024] As a preferred technical solution, the shift fork is provided with a reinforcing portion at the root, and the cross-sectional area of the reinforcing portion gradually increases from the fork leg to the root of the shift fork, so as to increase the bending section modulus.

[0025] On the other hand, the utility model further provides a vehicle, which comprises the electric gear shifting system according to any one of the above.

[0026] The embodiment of the utility model has the following advantages or beneficial effects:

[0027] The utility model mainly provides a kind of electric gear shifting system and vehicle, compared with prior art, the design that dial head does pendulum movement is used in the embodiment of the utility model, compared with traditional linear motion mechanism, it can provide certain buffer space between shift fork and gear sleeve in the process of gear shifting, so that the transmission of force is more smooth, can reduce gear shifting impact, improve the comfort and smoothness of gear shifting.

[0028] Secondly, the utility model cancels the positioning pin structure in traditional technology, and the fork shaft is directly fixedly installed on the housing, and the shift fork can freely move axially on the fork shaft, fundamentally eliminates the risk that positioning pin falls into the transmission case and causes damage, improves the safety and reliability of system.

[0029] Further, the utility model discloses angle position sensor module and the electronic monitoring system of magnetic element cooperation are provided, through real -time monitoring the rotation angle of the dial head to accurately control the displacement of gear shift fork, not only the monitoring precision is high, can also detect the abnormal situation in time when the tooth cover meets the greater resistance, prevent gear shift fork to continue to push forcibly, effectively avoid the risk of damage of gear shift system because of overload, improve the adaptability and durability of gear shift system.

[0030] In addition, the utility model discloses gear shift fork adopts symmetrical design, avoids the additional bending moment of too big in the process of promoting tooth cover. Meanwhile, the reinforcing part is designed at the root of gear shift fork, improves the bending resistance and structural stiffness of fork, improves the success rate of gear shift and the service life of system. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be needed to use the drawing in the embodiment description briefly introduced, constitutes the part of the utility model, the illustrative embodiment of the utility model and its explanation the utility model, and do not constitute the improper limitation of the utility model. In the drawings:

[0032] Figure 1 It is the structural schematic diagram of electric gear shift system provided in an embodiment of the utility model;

[0033] Figure 2 It is the structural cooperation schematic diagram of ball screw and ball nut provided in an embodiment of the utility model;

[0034] Figure 3 It is the structural cooperation schematic diagram of motion reverse conversion mechanism provided in an embodiment of the utility model;

[0035] Figure 4 It is the structural cooperation schematic diagram of gear shift fork and dial head provided in an embodiment of the utility model;

[0036] Figure 5 It is the installation position schematic diagram of angle position sensor provided in an embodiment of the utility model;

[0037] Figure 6 It is the installation position schematic diagram of magnetic element provided in an embodiment of the utility model;

[0038] Figure 7 It is the front view of gear shift fork provided in an embodiment of the utility model;

[0039] Figure 8 It is the overhead sectional view of gear shift fork provided in an embodiment of the utility model;

[0040] Figure 9The utility model provides a front view section of gear shift fork provided in an embodiment of the utility model.

[0041] Mark explanation:

[0042] Gear shift actuator 10, shift head 11, first guide groove 111, pivot 112, connecting arm 113, waist structure 114, gear shift motor 12, ball screw 13, ball nut 14, drive plate 141, shift fork shaft 20, gear shift fork 30, second guide groove 31, fan open mouth 311, fork leg 32, reinforcing portion 33, angle position sensor 40, magnetic element 50. Specific implementation

[0043] In order to make the utility model purposes, technical scheme and advantages more clear, below will combine the utility model specific embodiment and corresponding drawing to the utility model technical scheme clear, complete description is described.In the description of the utility model, it is explained that, the term " or " usually is with the meaning of " and / or " is used, unless the content is explicitly pointed out.

[0044] In the description of the present application, the term " first " " second " etc. are only used for distinguishing description, and can not be understood as indicating or implying relative importance.

[0045] Obviously, the described embodiment is only a part of the utility model embodiment, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor are within the scope of the utility model protection.

[0046] Reference Figure 1 In order to solve the prior art problems, the utility model embodiment provides an electric gear shift system, preferably including gear shift actuator 10, shift fork shaft 20 and gear shift fork 30, wherein, gear shift actuator 10 is equipped with the shift head 11 that can make pendulum movement;Shift fork shaft 20 is fixedly installed on the shell of electric gear shift system;Gear shift fork 30 is movably connected with shift head 11, and can be axially movably set on shift fork shaft 20;The pendulum movement of shift head 11 can promote gear shift fork 30 to move axially on shift fork shaft 20, and gear shift fork 30 is used to promote the axial movement of gear sleeve shaft, to realize gear shifting.

[0047] As Figure 2 , Figure 3In a preferred embodiment, the shift actuator 10 further comprises a shift motor 12, a ball screw 13 and a ball nut 14, the ball screw 13 is provided with balls between the ball screw 13 and the ball nut 14, the shift motor 12 is configured to drive the ball screw 13 to rotate around the axial direction, the ball screw 13 is capable of driving the balls to make a circular motion in the ball nut 14, so that the ball nut 14 makes a linear motion on the ball screw 13, and the ball nut 14 is connected with the shift fork 11 to drive the shift fork 11 to make a pendulum motion.

[0048] Preferably, the shift motor 12 can be a stepper motor or a servo motor, the output shaft of which is fixedly connected with one end of the ball screw 13 to drive the ball screw 13 to rotate; the outer surface of the ball screw 13 is provided with a spiral raceway, which forms a closed circulation channel with the raceway inside the ball nut 14, and a plurality of balls are arranged in the circulation channel, when the ball screw 13 rotates, the balls roll between the two raceways, and since the friction coefficient between the balls and the raceways is small, the rotational motion of the ball screw 13 can be converted into the linear motion of the ball nut 14.

[0049] Preferably, the two ends of the ball screw 13 are fixedly arranged on the shell of the shift actuator 10 to ensure that the ball screw 13 can remain stable in the axial direction during rotation; the outer part of the ball nut 14 is provided with a connecting structure, which is configured to form a mechanical connection with the shift fork 11 to convert the linear motion of the ball nut 14 into the pendulum rotary motion of the shift fork 11; and the shift fork 11 is installed on the shell by means of a pivot 112 or a hinge to ensure that it can make a pendulum motion around the fixed point.

[0050] Further, the shift motor 12 receives a shift signal through an electronic control system, drives the ball screw 13 to rotate by a specific angle according to the preset control parameters, so as to make the ball nut 14 produce a corresponding displacement, and finally transmits this motion to the shift fork 30 through the shift fork 11 to complete the shift operation.

[0051] Those skilled in the art should understand that, according to the requirements of specific application scenarios, the power of the shift motor 12, the pitch and diameter of the ball screw 13, the number and size of the balls and other specification parameters can be selected and adjusted to adapt to different shift force requirements and space limitations, which are not specifically limited in the present embodiment.

[0052] In a preferred embodiment, the connecting structure between the ball nut 14 and the shift fork 11 is configured as a motion reverse conversion mechanism, which is configured to convert the forward motion of the ball nut 14 into the backward pendulum motion of the shift fork 11, and convert the backward motion of the ball nut 14 into the forward pendulum motion of the shift fork 11.

[0053] In a preferred embodiment, the motion reverse conversion mechanism comprises a driving plate 141 and a first guide groove 111, the driving plate 141 is arranged on the ball nut 14 and extends towards the direction of the knob 11, and the first guide groove 111 is arranged on the knob 11, the two sides of the first guide groove 111 are configured as arc surfaces; one end of the driving plate 141 extends into the first guide groove 111, and gaps are respectively arranged between the two sides of the driving plate 141 and the two arc surfaces of the first guide groove 111; when the ball nut 14 drives the driving plate 141 to move forward, the driving plate 141 abuts against the arc surface on the front side of the first guide groove 111, converting the linear motion of the ball nut 14 into the pendulum motion of the knob 11 rotating backward; when the ball nut 14 drives the driving plate 141 to move backward, the driving plate 141 abuts against the arc surface on the rear side of the first guide groove 111, converting the linear motion of the ball nut 14 into the pendulum motion of the knob 11 rotating forward.

[0054] Specifically, the driving plate 141 is fixedly connected to the outer side of the ball nut 14 and extends towards the direction of the knob 11 to form a protruding tongue structure; the first guide groove 111 arranged on the knob 11 has two oppositely arranged arc profiles, and the arc design enables smooth contact and motion conversion between the driving plate 141 and the first guide groove 111. When the ball nut 14 moves forward under the driving of the ball screw 13, the driving plate 141 advances forward, and the front end of the driving plate 141 contacts the arc surface on the front side of the first guide groove 111, generating a pushing moment, which makes the knob 11 rotate backward around the pivot 112 to complete a pendulum motion.

[0055] Preferably, the space between the two arc surfaces of the first guide groove 111 is slightly larger than the thickness of the driving plate 141, so as to provide a controlled motion space and ensure that the driving plate 141 can maintain stable contact during the pushing process, while not increasing the frictional resistance due to the tight fit. When reverse operation is required, the ball nut 14 moves backward, and the driving plate 141 retreats backward, at which time the driving plate 141 contacts the arc surface on the rear side of the first guide groove 111 to push the knob 11 to perform a forward pendulum motion.

[0056] Through the motion reverse conversion mechanism, efficient conversion from linear motion to rotary motion can be achieved, and due to the adoption of the arc contact surfaces, the force transmission is smoother, and the impact and noise during the motion are reduced; in addition, the appropriate gap between the driving plate 141 and the first guide groove 111 also provides certain fault tolerance for the system, which can absorb part of the impact force during gear shifting and improve the smoothness and durability of the entire gear shifting system.

[0057] As Figure 4In a preferred embodiment, the bottom of the shift knob 11 is provided with a connecting arm 113, which is provided with a waist-shaped structure 114; the top of the shift fork 30 is provided with a second guide slot 31, the top of which is provided with a fan-shaped opening 311; when the shift knob 11 rotates backward and performs a pendulum movement, the bottom of the connecting arm 113 abuts against the rear wall of the second guide slot 31, and the waist-shaped structure 114 cooperates with the fan-shaped opening 311 to drive the shift fork 30 to move axially rearward; when the shift knob 11 rotates forward and performs a pendulum movement, the bottom of the connecting arm 113 abuts against the front wall of the second guide slot 31, and the waist-shaped structure 114 cooperates with the fan-shaped opening 311 to drive the shift fork 30 to move axially forward.

[0058] Specifically, the curvature of the fan-shaped opening 311 matches the waist-shaped structure 114 of the connecting arm 113, ensuring smooth contact and effective force transmission during movement. When the shift knob 11 rotates backward, the rear side of the bottom of the connecting arm 113 forms a thrust contact with the rear wall of the second guide slot 31, and the front side of the waist-shaped structure 114 rotates along the front side arc of the fan-shaped opening 311. This cooperative relationship enables the rotational movement of the shift knob 11 to be converted into the rearward axial movement of the shift fork 30. Similarly, when the shift knob 11 rotates forward, the front side of the bottom of the connecting arm 113 abuts against the front wall of the second guide slot 31, and the rear side of the waist-shaped structure 114 rotates along the rear side arc of the fan-shaped opening 311, driving the shift fork 30 to move axially forward.

[0059] In a preferred embodiment, a predetermined gap is provided between the shift knob 11 and the second guide slot 31, and the two gaps cooperate. Optionally, the single-sided gap between the shift knob 11 and the shift fork 30 is configured to be 0.1-0.5 mm. On the one hand, this can provide the necessary movement buffer space to absorb impact forces during shifting, and at the same time, it also provides accommodation space for thermal expansion and manufacturing tolerances, ensuring that the system can operate reliably under various working conditions.

[0060] Through the cooperation between the connecting arm 113 and the second guide slot 31, it is ensured that the torque can be effectively transmitted, while unnecessary friction and wear are reduced. In addition, the cooperation between the waist-shaped structure 114 and the fan-shaped opening 311 also provides a certain self-adaptive ability, which can maintain reliable connection under various working conditions, and even in the presence of slight manufacturing deviations or system vibrations, it can ensure the accuracy and reliability of the shifting operation.

[0061] In the present embodiment, a new motion conversion mechanism is formed between the linear motion of the ball nut 14 and the pendulum motion of the knob 11 and the linear motion of the shift fork 30. When the actuator drives the ball nut 14 to move linearly along the axial direction, the motion is first transmitted to the knob 11 structure, causing the knob 11 to produce a pendulum swing around its pivot 112. The pendulum motion of the knob 11 is then converted into the linear motion of the shift fork 30 through the connecting mechanism, thereby completing the gear shifting operation. This "linear-swing-linear" motion conversion link effectively changes the force transmission mode in the traditional gear shifting mechanism. Compared with the traditional linear motion mechanism, this structure introduces nonlinear motion characteristics during the gear shifting process, which can provide a predetermined buffer space and gear shifting characteristics during the contact between the shift fork 30 and the gear sleeve. When the tooth profile of the gear sleeve and the target gear are not completely aligned, the pendulum structure can absorb part of the impact energy and allow for slight adjustment until the tooth profile is fully engaged. In addition, the change in the angle of the pendulum motion causes the force transmission to exhibit a characteristic curve of initial slow, middle accelerated, and end decelerated. This nonlinear characteristic can significantly reduce the impact load during gear shifting, reduce the instantaneous contact stress of the tooth surface, and effectively prolong the service life of the gear sleeve and the synchronizer assembly.

[0062] Specifically, the linear displacement of the ball nut 14, the swing angle of the knob 11, and the linear displacement of the shift fork 30 are not necessarily set in a simple geometric progression. Preferably, the movement distance of the ball nut 14 can be magnified or reduced through the lever principle to convert into a specific swing angle of the knob 11, which is then converted into a predetermined linear displacement of the shift fork 30 through the connecting mechanism.

[0063] In a preferred embodiment, the curvature radius of the arc-shaped surfaces on both sides of the first guide groove 111 is configured according to the required force transmission characteristics during gear shifting. The arc of the top fan-shaped opening 311 of the second guide groove 31 should match the maximum swing angle of the knob 11, and its arc range should be slightly larger than the required swing angle for actual work to reserve sufficient adjustment margin and ensure reliable operation of the system under extreme working conditions. The specific shape parameters of the first guide groove 111 and the second guide groove 31 are not limited in the present embodiment, and those skilled in the art can adaptively configure them according to actual gear shifting needs.

[0064] As Figure 5 , Figure 6In a preferred embodiment, the gear shift actuator 10 is provided with a circuit board, on which an angle position sensor 40 is arranged, and the shift knob 11 is provided with a magnetic element 50 adapted to the angle position sensor 40, which can be configured as a magnet, and the rotation angle of the magnetic element 50 is consistent with the rotation angle of the shift knob 11. The angle position sensor 40 is used to monitor the rotation angle of the magnetic element 50 and ultimately determine the displacement of the shift fork 30. When the shift knob 11 swings during the gear shift operation, the magnetic element 50 rotates accordingly, and the change of the magnetic field direction is captured by the angle position sensor 40 in real time and converted into a high-precision electrical signal. After being processed by the control unit, the electrical signal is used to accurately calculate the actual swing angle of the shift knob 11, and through a pre-set motion relationship model, the precise displacement of the shift fork 30 is indirectly determined.

[0065] Preferably, the angle position sensor 40 is also used to monitor the rotation angle of the magnetic element 50 to achieve electronic limiting between the shift knob 11 and the shift fork 30. Specifically, the traditional mechanical limiting structure is prone to damage due to impact and is inconvenient to adjust, while the electronic limiting triggers the control unit to take deceleration or stop measures in advance when the shift knob 11 approaches the limit position through the angle threshold parameter pre-set by software, so as to avoid impact damage caused by mechanical hard contact. Preferably, the angle position sensor 40 can monitor the swing speed and acceleration of the shift knob 11 in real time, and when an abnormal motion state is detected, the control unit can immediately adjust the output of the gear shift motor 12 to prevent the shift fork 30 from running out of range.

[0066] Those skilled in the art should understand that the electronic limiting function allows dynamic adjustment of the limiting range according to different vehicle models and different working conditions, so the specific limiting parameters are not limited in this embodiment.

[0067] In a preferred embodiment, the angle position sensor 40 adopts a Hall effect or magnetoresistive non-contact sensor, which not only has high precision and high response speed characteristics, but also can maintain stable and reliable working performance under vehicle operating conditions. The sensor and the control unit adopt digital signal transmission, which can suppress the influence of electromagnetic interference on measurement accuracy. Through the fusion calculation of the sensor and the encoder data of the gear shift motor 12, the system can realize closed-loop control to accurately control the swing angle of the shift knob 11 under any working condition, thereby ensuring the position accuracy of the shift fork 30 and the gear shift quality and control consistency of the entire gear shift system.

[0068] It should be noted that the core innovation of the embodiment of the utility model lies in proposing a structure-optimized electric gear shifting system, which realizes smooth force transmission through a pendulum movement structure, and solves the problems of large impact, low precision, poor reliability and the like existing in traditional gear shifting systems in combination with a non-contact angle monitoring scheme. The relevant control and monitoring program of the gear shifting motor 12 based on the angle position sensor 40 is existing, and is not the utility model point of the present application, and thus is not limited. The monitoring system serves as a matching device of a mechanical structure, provides real-time state information for the gear shifting process, but the communication protocol, signal processing algorithm, gear shifting strategy and software implementation and the like of the control unit all adopt existing mature technologies, and these control level contents are not within the protection scope of the present application. The technical contribution of the utility model mainly lies in the physical structure level of mechanism design and sensor arrangement, and is used for providing a reliable hardware basis for the electric gear shifting system.

[0069] Reference Figures 7-9 In a preferred embodiment, the shifting fork 30 is provided with fork legs 32 on both sides, and the fork legs 32 are configured in a symmetrical structure to maximize the uniform force on both sides of the shifting fork 30 and the consistent rigidity in the force receiving process, thereby avoiding the generation of excessive additional bending moment in the process of pushing the synchronous gear sleeve, hindering the movement of the synchronous gear sleeve, causing the gear shifting force to be too large, the gear shifting to be uneven, and even the gear shifting to fail.

[0070] Preferably, since the shifting fork 30 bears a bending moment in the movement process, and the bending moment is larger towards the root, the root of the shifting fork 30 is provided with a reinforcing portion 33 for increasing the bending section modulus.

[0071] In a preferred embodiment, the reinforcing portion 33 is configured in a triangular structure that gradually narrows from the root of the shifting fork 30 to the fork leg 32, forming a mechanical configuration similar to the root reinforcement of a cantilever beam to provide more efficient mechanical support. More preferably, the thickness of the reinforcing portion 33 is also optimized according to the stress distribution, i.e., the root is thicker and gradually thins towards the fork leg 32 to achieve the best matching of material distribution and stress condition.

[0072] Preferably, the shifting fork 30 comprises cast iron material, preferably QT600-3 GB / T 13482019, and the fork shaft 20 comprises steel material. Under the working condition of the conventional gear shifting force 600N and the maximum force 1000N on the actual vehicle, the symmetrical structure and the reinforcing portion 33 of the shifting fork 30 are simulated and analyzed in terms of rigidity and strength, and the analysis result is that the maximum stress of the shifting fork 30 under the maximum gear shifting force 1000N is 94Mpa, which is less than the yield strength 370Mpa of the material, and the structure design of the shifting fork 30 is qualified.

[0073] Compared with the prior art, the electric gear shifting system has the advantages of compact structure, rapid response, smooth gear shifting, long service life and the like, can effectively solve the problems of large gear shifting force, high noise and short service life in the prior art, and provides an innovative solution for the technical upgrading of the automobile transmission.

[0074] In an embodiment of the utility model, a vehicle is also provided, the vehicle is equipped with the electric gear shifting system in the above embodiment, optionally, the vehicle can be a pure electric drive, pure oil drive or hybrid vehicle, can be a commercial vehicle or passenger vehicle, the transmission of the vehicle can also be flexibly adapted to different gear settings.

[0075] The electric gear shifting system of the utility model can be parameterized adjusted according to the gear shifting stroke and gear shifting force requirements of different vehicle models, can adapt to the gear shifting characteristics of different types of transmissions without changing the basic structure, greatly improves the universality and industrial application value of the system.

[0076] Although example embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the above description is by way of example only, and is not intended to limit the scope of the application. Various modifications and changes can be made thereto by those of ordinary skill in the art without departing from the scope and spirit of the application. All such modifications and changes are intended to be included within the scope of the application as expressed by the following claims.

[0077] In the specification provided herein, a large number of specific details are explained. However, it can be understood that the embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure the understanding of this specification.

[0078] Similarly, it is to be understood that, in order to simplify the present application and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, various features of the present application are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of the present application should not be interpreted as reflecting the intention that the claimed application requires more features than the features explicitly recited in each claim. Rather, as reflected by the corresponding claims, the inventive point is that the corresponding technical problem can be solved with fewer features than all the features of a certain disclosed single embodiment. Therefore, the claims following the specific embodiments are hereby expressly incorporated into the specific embodiments, wherein each claim itself is a separate embodiment of the present application.

[0079] Those skilled in the art will appreciate that the features described in this specification (including the accompanying claims, abstract and drawings) and / or any methods or processes described in this specification can be combined in any combination. Each feature disclosed in this specification (including the accompanying claims, abstract and drawings) can also be replaced by an alternative feature providing the same, equivalent or similar functionality. Unless otherwise stated, each feature disclosed in this specification (including the accompanying claims, abstract and drawings) is understood to be combinable with any and every other disclosed feature or combination of features.

Claims

1. An electric gear shifting system, characterized in that, Includes the shift actuator, shift fork shaft, and shift fork; The shift actuator is equipped with a rotatable dial head, which is movably connected to the shift fork, and the shift fork is axially movable and sleeved on the fork shaft. The rotational motion of the shift head is used to push the shift fork to move axially on the shift fork shaft, and the shift fork is used to push the gear sleeve to move axially to achieve gear shifting.

2. The electric shifting system according to claim 1, characterized in that, The rotational motion of the shift head is a pendulum motion, and the shift actuator also includes a shift motor, a ball screw, and a ball nut, the ball nut being connected to the shift head in a cooperative manner; The shift motor is used to drive the ball screw, causing the ball nut to move along the axial direction of the ball screw, and driving the dial head to perform a pendulum-like motion.

3. The electric shifting system according to claim 2, characterized in that, A motion reversal conversion mechanism is provided between the ball nut and the shift head, which is used to convert the forward motion of the ball nut into the backward motion of the shift head driving the shift fork, or to convert the backward motion of the ball nut into the forward motion of the shift head driving the shift fork.

4. The electric shifting system according to claim 3, characterized in that, The motion reversal mechanism includes a drive plate and a first guide groove. The drive plate is disposed on the ball nut and extends toward the dial head. The first guide groove is disposed on the dial head, and the two sides of the first guide groove are configured as arc-shaped surfaces. One end of the drive plate extends into the first guide groove, and there are gaps between the two sides of the drive plate and the two arc-shaped surfaces of the first guide groove, respectively. When the ball nut drives the drive plate to move forward, the drive plate abuts against the arc-shaped surface on the front side of the first guide groove, converting the linear motion of the ball nut into a pendulum-like motion of the dial rotating backward.

5. The electric shifting system according to claim 4, characterized in that, The bottom of the shift head is provided with a connecting arm, and the connecting arm has a waist-shaped structure; the top of the shift fork is provided with a second guide groove, and the top of the second guide groove is provided with a fan-shaped opening; When the shift head rotates backward in a pendulum motion, the bottom of the connecting arm abuts against the second guide groove, and the waist-shaped structure cooperates with the fan-shaped opening to drive the shift fork to move axially backward. Alternatively, when the shift head rotates forward in a pendulum motion, it drives the shift fork to move forward axially.

6. The electric shifting system according to claim 1, characterized in that, The shift actuator is equipped with an angle position sensor, and the shift head is equipped with a magnetic element corresponding to the angle position sensor. The rotation angle of the magnetic element is the same as the rotation angle of the shift head. The angle position sensor is used to monitor the rotation angle of the magnetic element and determine the displacement of the shift fork.

7. The electric shifting system according to claim 1, characterized in that, The shift fork shaft is fixedly mounted on the housing of the electric shifting system.

8. The electric shifting system according to claim 1, characterized in that, The shift fork has fork feet on both sides, and the fork feet are configured in a symmetrical structure so that the shift fork can be evenly stressed on both sides.

9. The electric shifting system according to claim 8, characterized in that, The base of the shift fork is provided with a reinforcing part, and the cross-sectional area of ​​the reinforcing part gradually increases from the fork foot to the base of the shift fork, in order to increase the bending section modulus.

10. A vehicle, characterized in that, The vehicle includes the electric shifting system as described in any one of claims 1-9.

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