A simplified two-speed shifting mechanism

Abstract

This application relates to the field of mechanical transmission and gear shifting control technology, and in particular to a simplified two-gear shifting mechanism, which includes a housing, a motor, a lead screw, a lead screw nut, a shift fork, and an angle sensor. The motor is fixedly connected to the housing, the lead screw is driven by the motor output end, the lead screw nut is screwed to the lead screw, the shift fork is circumferentially fixed to the lead screw nut, and the angle sensor is mounted on the housing to measure the shifting position. The structure can also be optimized by adding a motor side cover, a sensor shaft, a vent plug, and a retaining ring. This mechanism replaces the complex gear structure with a motor drive and lead screw transmission, simplifying the design, reducing size and weight, and improving shifting stability through precise positioning via the angle sensor, thereby reducing manufacturing and maintenance costs. It is suitable for equipment transmission scenarios with requirements for space and precision.

Description

Technical Field

[0001] This application relates to the field of mechanical transmission and shift control technology, and in particular to a simplified two-speed shift mechanism. Background Technology

[0002] In mechanical transmission equipment, the gear shifting mechanism is a key component for realizing the conversion of different speeds and torque outputs, and its performance directly affects the working efficiency, operational stability and service life of the equipment.

[0003] Currently, most common two-speed gear shifting mechanisms on the market employ complex gear transmission structures, achieving gear switching through the meshing and disengagement of multiple gears. To ensure reliability and transmission efficiency, this traditional gear-driven shifting mechanism typically requires numerous gears, synchronizers, shift fork shafts, and other components, resulting in a complex structure, large size, and heavy weight. In applications with strict space and weight constraints, such as small construction machinery, microcar transmissions, and some precision machinery, the traditional complex two-speed gear shifting mechanism struggles to meet installation space and weight requirements, posing significant challenges to the overall design and layout of the equipment. Furthermore, the complex gear transmission structure increases the difficulty of manufacturing the shifting mechanism, leading to higher production costs. During long-term use, the numerous contact points and relative motion in gear meshing transmissions can cause gear wear and tooth surface fatigue, resulting in a higher failure rate and requiring frequent maintenance and repairs. This not only increases operating costs but also affects the normal operation of the equipment.

[0004] In addition, traditional gear transmission shifting mechanisms require high control precision for the meshing and disengagement of gears during shifting. If the control is not proper, shifting shocks and uneven shifting can easily occur, affecting the smooth operation and comfort of the equipment. This makes it difficult to meet the high precision, high stability and low failure rate requirements of modern mechanical equipment for shifting mechanisms.

[0005] To address this problem, a simplified two-speed shifting mechanism has been invented. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of existing two-speed shifting mechanisms, such as complex structure, large size, heavy weight, high manufacturing and maintenance costs, and insufficient shifting accuracy and stability. This invention provides a simplified two-speed shifting mechanism. By simplifying the structural design, reducing the number of parts, and lowering the size and weight of the mechanism, it can adapt to application scenarios with strict limitations on installation space and weight. Simultaneously, by adopting a stable and reliable transmission method, it improves shifting accuracy and stability, reduces shifting impact and failure rate, reduces manufacturing and maintenance costs, and extends the service life of the mechanism, thus meeting the needs of modern mechanical equipment for efficient, accurate, stable, and economical two-speed shifting mechanisms.

[0007] This application provides a simplified two-speed shifting mechanism, which adopts the following technical solution: including: case; The motor is fixedly connected to the housing; The lead screw is connected to the output end of the motor for transmission. A lead screw and a nut, wherein the lead screw and the lead screw form a helical drive engagement; The shift fork forms a circumferentially fixed transmission engagement with the lead screw nut; An angle sensor, which is mounted on the housing and used to detect the shift position.

[0008] Optionally, it also includes a motor side cover, which is disposed between the motor and the housing, with one side of the motor side cover fitting against the end face of the motor and the other side fitting against the end face of the housing.

[0009] Optionally, it also includes a sensor shaft, which passes through the mating point between the shift fork and the lead screw nut, and the sensor shaft and the shift fork form a circumferential fixed fit.

[0010] Optionally, the top of the housing is provided with a vent hole, and a vent plug is provided at the vent hole, the vent plug's venting channel communicating with the inner cavity of the housing.

[0011] Optionally, a retaining ring is also included, which is embedded in the mounting groove of the housing, with one side of the retaining ring abutting against the end face of the angle sensor and the other side contacting the housing.

[0012] Optionally, the motor can rotate in both directions. When the motor rotates in the forward direction, it drives the lead screw to rotate and moves the lead screw nut axially, thereby driving the shift fork to rotate to the first gear. When the motor rotates in the reverse direction, it drives the lead screw to rotate and moves the lead screw nut axially, thereby driving the shift fork to rotate to the second gear.

[0013] In summary, this application includes the following beneficial technical effects: 1. Simplified structure and reduced size and weight: Compared with the traditional gear transmission shift mechanism, the two-speed shift mechanism of this utility model reduces a large number of complex gears, synchronizers and other components. It adopts a simplified transmission structure of motor, lead screw, lead screw nut and shift fork, which significantly simplifies the overall structure and effectively reduces the size and weight of the mechanism. It can be easily adapted to equipment with strict requirements for installation space and weight, and improves the flexibility of the overall design and layout of the equipment.

[0014] 2. Precise shifting and high stability: The motor-driven lead screw transmission offers high transmission precision, accurately converting the motor's rotational motion into the axial movement of the lead screw nut. The circumferential fixation between the lead screw nut and the shift fork ensures the shift fork rotates precisely to the corresponding gear. Simultaneously, an angle sensor monitors the shifting position in real time, further ensuring shifting accuracy. Furthermore, this transmission method provides smooth operation, reducing the impact and vibration of traditional gear drives, lowering the failure rate during shifting, and improving the operational stability and reliability of the shifting mechanism.

[0015] 3. Low manufacturing and maintenance costs, and long service life: The components used in this shifting mechanism are mostly common and mature parts, with simple manufacturing processes that do not require complex processing equipment and technology, thus reducing manufacturing costs. At the same time, the simplified structure reduces the number of parts, making maintenance and repair more convenient during use, reducing the time and costs required for maintenance. Furthermore, compared to gear drives, screw drives experience less wear and have a longer service life, further extending the overall service life of the shifting mechanism and reducing the overall operating cost of the equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the device. Figure I ; Figure 2 This is a schematic diagram of the overall structure of the device. Figure II ; Figure 3 This is a front view of the device; Figure 4 This is a top view of the device; Figure 5 This is a cross-sectional view of the overall structure of the device. Figure I ; Figure 6 This is a cross-sectional view of the overall structure of the device. Figure II ; Among them, 1-motor, 2-motor side cover, 3-housing, 4-lead screw, 5-lead screw nut, 6-shift fork, 7-sensor shaft, 8-vent plug, 9-angle sensor, 10-retaining ring. Detailed Implementation

[0017] The present application will be further described in detail below with reference to the accompanying drawings. In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present utility model.

[0018] Reference Figure 1 , Figure 3 , Figure 5 , Figure 6 One embodiment shown is as follows: The simplified two-speed shifting mechanism includes a housing 3, a motor 1, a lead screw 4, a lead screw nut 5, a shift fork 6, and an angle sensor 9. In this embodiment, the motor 1 is detachably fixed to one side of the housing 3 by bolts. The output end of the motor 1 faces the inner cavity of the housing 3, and the axis of the output end of the motor 1 is on the same straight line as the horizontal center line of the housing 3. One end of the lead screw 4 is coaxially connected to the output end of the motor 1 through a coupling. The inner hole of the coupling is interference-fitted with the outer circular surface of the output end of the motor 1 and the outer circular surface of the end of the lead screw 4, respectively, to ensure that the motor 1 can synchronously drive the lead screw 4 to rotate when it rotates. The other end of the lead screw 4 extends to a preset position in the inner cavity of the housing 3, and the axis of the lead screw 4 is coaxial with the axis of the output end of the motor 1. The lead screw nut 5 is sleeved on the outer circular surface of the lead screw 4. The inner hole of the lead screw nut 5 is machined with an internal thread, and the outer circular surface of the lead screw 4 is machined with an external thread that matches the internal thread. The two are engaged by thread meshing. A helical transmission is formed, allowing the lead screw nut 5 to reciprocate linearly along the axis of the lead screw 4. The shift fork 6 includes a fork body and a connecting part. The connecting part has an assembly hole that matches the outer circular surface of the lead screw nut 5. The outer circular surface of the lead screw nut 5 and the inner circular surface of the assembly hole are connected by a flat key to form a circumferentially fixed transmission fit. The flat key is embedded in the keyway on the outer circular surface of the lead screw nut 5 and the keyway on the inner circular surface of the assembly hole, restricting the relative circumferential rotation between the lead screw nut 5 and the shift fork 6. At the same time, the fork body of the shift fork 6 extends towards the gear-shifting component outside the housing 3, and the opening direction of the fork body corresponds to the shifting groove direction of the gear-shifting component. The angle sensor 9 is fixedly mounted to the top end face of the housing 3 by screws. The detection end of the angle sensor 9 extends through the mounting hole on the top of the housing 3 into the inner cavity of the housing 3, and the axis of the detection end is in the same vertical plane as the axis of the connecting part of the shift fork 6. The detection end of the angle sensor 9 can directly sense the rotation angle of the shift fork 6, thereby realizing the detection of the shifting position.

[0019] The implementation principle is as follows: After the motor 1 is powered on, it generates rotational power, which is transmitted to the lead screw 4 through the coupling, causing the lead screw 4 to rotate synchronously with the motor 1. Since the lead screw 4 and the lead screw nut 5 form a helical transmission through threaded engagement, the rotational motion of the lead screw 4 is converted into the linear motion of the lead screw nut 5 along the axis of the lead screw 4. Furthermore, since the lead screw nut 5 and the shift fork 6 are circumferentially fixed through a flat key, the linear motion of the lead screw nut 5 drives the shift fork 6 to rotate around the axis of its connecting part. During the rotation of the shift fork 6, the detection end of the angle sensor 9 senses the rotation angle of the shift fork 6 in real time. When the shift fork 6 rotates to the angle position corresponding to the gear, the angle sensor 9 feeds back the detection signal to the control unit. The control unit controls the motor 1 to stop rotating, thereby completing the gear shifting action and achieving precise gear switching.

[0020] Reference Figure 3 , Figure 5 , Figure 6 One embodiment shown is as follows: The simplified two-speed shifting mechanism also includes a motor 1 side cover. In this embodiment, the motor 1 side cover is a circular plate structure, the diameter of which is equal to the diameter of the end face of the motor 1 and the diameter of the corresponding end face of the housing 3. One end face of the motor 1 side cover is tightly fitted with the end face of the motor 1 facing the housing 3 through sealant, with no gap between the fitting surfaces, and the axis of the motor 1 side cover is coaxial with the axis of the output end of the motor 1. The other end face of the motor 1 side cover is tightly fitted with the end face of the housing 3 facing the motor 1 through sealant, with no gap between the fitting surfaces, and a circular through hole is opened at the position of the motor 1 output end on the motor 1 side cover. The diameter of the through hole is slightly larger than the diameter of the motor 1 output end, and the motor 1 output end can pass through the through hole to achieve a transmission connection with the lead screw 4. At the same time, multiple bolt holes are evenly opened at the edge of the motor 1 side cover. The bolts pass through the bolt holes on the motor 1 housing 3, the bolt holes on the motor 1 side cover, and the bolt holes on the end face of the housing 3 in sequence, so that the motor 1, the motor 1 side cover, and the housing 3 are detachably and fixedly connected as a whole.

[0021] The implementation principle is as follows: The side cover of motor 1 is set between motor 1 and housing 3, and its two end faces are tightly fitted with the end faces of motor 1 and housing 3 respectively. On the one hand, it can fill the assembly gap that may exist between motor 1 and housing 3, ensure the coaxiality of the connection of the three, and avoid the output end of motor 1 and lead screw 4 being out of sync due to assembly deviation. On the other hand, through the sealing effect of the sealant, it can prevent external dust, moisture and other impurities from entering the inner cavity of housing 3 through the connection gap between motor 1 and housing 3, protecting the lead screw 4, lead screw nut 5 and other components inside housing 3 from contamination and extending the service life of the components. At the same time, the side cover of motor 1 is fixedly connected to motor 1 and housing 3 by bolts, which further enhances the stability of the connection of the three, ensuring that motor 1 will not shake during operation and ensuring the smoothness of transmission.

[0022] Reference Figure 5 , Figure 6 One embodiment shown is as follows: The simplified two-gear shifting mechanism further includes a sensor shaft 7. In this embodiment, the sensor shaft 7 has a cylindrical structure, and its axis is perpendicular to the axis of the lead screw 4 and lies in the same horizontal plane. A radially extending shaft hole is provided on the inner wall of the mounting hole of the shift fork 6 connection. A through hole of the same diameter is provided on the lead screw nut 5 at the position corresponding to the shaft hole. The sensor shaft 7 passes through the shaft hole of the shift fork 6 connection and the through hole of the lead screw nut 5 in sequence. The outer circular surface of the sensor shaft 7 is transition-fitted with the inner circular surface of the shaft hole and the through hole to ensure that the sensor shaft 7 can be stably installed at the mating point of the shift fork 6 and the lead screw nut 5. Furthermore, both ends of the sensor shaft 7 extend to the outer sides of the connecting part of the shift fork 6; the sensor shaft 7 and the shaft hole of the connecting part of the shift fork 6 form a circumferential fixed fit through a pin, the pin is inserted into the connecting part of the shift fork 6 and the sensor shaft 7 in a direction perpendicular to the axis of the sensor shaft 7, and both ends of the pin are respectively embedded in the pin hole of the connecting part of the shift fork 6 and the pin hole of the sensor shaft 7, restricting the relative circumferential rotation between the sensor shaft 7 and the shift fork 6; at the same time, one end of the sensor shaft 7 is set opposite to the detection end of the angle sensor 9, ensuring that the angle sensor 9 can indirectly detect the rotation angle of the shift fork 6 by sensing the rotation of the sensor shaft 7.

[0023] The implementation principle is as follows: When the lead screw nut 5 drives the shift fork 6 to rotate, since the sensor shaft 7 and the shift fork 6 are circumferentially fixed by a pin, the rotation of the shift fork 6 will synchronously drive the sensor shaft 7 to rotate around its own axis; the detection end of the angle sensor 9 senses the rotation angle of the sensor shaft 7 in real time, converts the rotation angle of the sensor shaft 7 into an electrical signal and feeds it back to the control unit; the control unit determines whether the rotation angle of the sensor shaft 7 has reached the angle of the corresponding gear according to the preset gear angle parameters, and then determines whether the shift fork 6 has rotated to the target gear; if the target angle is reached, the control unit controls the motor 1 to stop rotating, completing the gear shift; the setting of the sensor shaft 7 can further transmit the rotational motion of the shift fork 6, making the detection of the angle sensor 9 more stable and accurate, avoiding detection errors caused by the shift fork 6 directly contacting the angle sensor 9, and also enhancing the structural strength of the joint between the shift fork 6 and the lead screw nut 5, preventing the shift fork 6 from deforming during rotation.

[0024] Reference Figure 4 , Figure 5 , Figure 6One embodiment shown is as follows: The simplified two-speed shift mechanism has a vent hole on the top of the housing 3, and a vent plug 8 is installed at the vent hole. In this embodiment, the housing 3 is a hollow cuboid structure, and a circular vent hole is opened at the center of the top end face of the housing 3. The axis of the vent hole is perpendicular to the top end face of the housing 3. One end of the vent hole communicates with the inner cavity of the housing 3, and the other end communicates with the outside atmosphere. The vent plug 8 is a cylindrical structure with external threads machined on its outer circular surface. The inner wall of the vent hole is machined with internal threads that match the external threads. The vent plug 8 is detachably installed in the vent hole through a threaded connection, allowing air to pass through. The top end face of the vent plug 8 is flush with the top end face of the housing 3, and the bottom end face of the vent plug 8 extends to the upper part of the inner cavity of the housing 3. A ventilation channel is provided inside the vent plug 8 along the axial direction. One end of the ventilation channel is located at the center of the top end face of the vent plug 8, and the other end is located at the center of the bottom end face of the vent plug 8. The diameter of the ventilation channel is smaller than the diameter of the ventilation hole, and a dust filter is provided inside the ventilation channel. The dust filter is fixed inside the ventilation channel by interference fit, which can prevent external dust from entering the inner cavity of the housing 3. At the same time, a slot is provided on the top end face of the vent plug 8, which makes it easy to install and remove the vent plug 8 with a screwdriver.

[0025] The implementation principle is as follows: During the operation of the shifting mechanism, the frictional heat generated by the mutual movement of components such as the lead screw 4 and lead screw nut 5 inside the housing 3 causes the air inside the housing 3 to expand due to heat, and the air pressure inside the housing 3 increases. At this time, the high-pressure air inside the housing 3 can be discharged to the outside atmosphere through the venting channel of the vent plug 8, realizing the air pressure balance inside and outside the housing 3, and avoiding deformation of the housing 3 or failure of component sealing due to excessive air pressure inside the housing 3. When the shifting mechanism stops working, the air inside the housing 3 cools and contracts, the air pressure inside the housing 3 decreases, and the outside atmosphere can enter the inner cavity of the housing 3 through the venting channel of the vent plug 8, realizing air pressure balance again. The dust filter in the venting channel can prevent dust and impurities in the outside air from entering the inner cavity of the housing 3, and prevent dust from adhering to the surface of components such as the lead screw 4 and lead screw nut 5, affecting the transmission accuracy and service life of the components. The vent plug 8 is installed in the vent hole through a threaded connection, which is convenient for later disassembly, cleaning or replacement of the dust filter, and ensures the long-term stability of the ventilation function.

[0026] Reference Figure 5 , Figure 6One embodiment shown is as follows: The simplified two-speed shifting mechanism also includes a retaining ring 10. In this embodiment, a circular mounting groove is provided on the top end face of the housing 3 at the position for mounting the angle sensor 9. The axis of the mounting groove is coaxial with the axis of the angle sensor 9. The diameter of the mounting groove is larger than the diameter of the base of the angle sensor 9, and the depth of the mounting groove is equal to the thickness of the retaining ring 10. The retaining ring 10 is an annular structure, with its outer diameter equal to the diameter of the mounting groove. The inner diameter of the retaining ring 10 is smaller than the diameter of the base of the angle sensor 9 but larger than the diameter of the detection end of the angle sensor 9. The retaining ring 10 is embedded in the mounting groove of the housing 3 by interference fit. The outer circumferential surface of the retaining ring 10 is tightly fitted to the inner wall of the mounting groove without any looseness or gap. The base of the sensor 9 is circular. The base of the angle sensor 9 is placed on the top end face of the retaining ring 10. The top end face of the retaining ring 10 and the bottom end face of the base of the angle sensor 9 are in close contact with each other, forming axial support. The bottom end face of the retaining ring 10 is in close contact with the bottom of the mounting groove. The bottom of the mounting groove is a flat structure, ensuring that the retaining ring 10 can be stably placed in the mounting groove. At the same time, the base of the angle sensor 9 is fixedly connected to the top end face of the housing 3 by screws. The screws pass through the bolt holes of the base of the angle sensor 9 and engage with the threaded holes of the top end face of the housing 3, pressing the angle sensor 9 onto the retaining ring 10, so that the retaining ring 10 is always clamped by the base of the angle sensor 9 and the bottom of the mounting groove.

[0027] The implementation principle is as follows: The retaining ring 10 is embedded in the mounting groove of the housing 3, with its bottom end face contacting the bottom of the mounting groove and its top end face abutting against the base of the angle sensor 9. This provides stable axial support for the angle sensor 9, determining its mounting height on the housing 3 and preventing improper relative positioning between the detection end and the shift fork 6 (or sensor shaft 7) due to installation height deviation, which would affect detection accuracy. Simultaneously, when the angle sensor 9 is fixed to the housing 3 with screws, the preload of the screws causes the base of the angle sensor 9 to press against the retaining ring 10, allowing the retaining ring 10 to... The pressure of the base of the angle sensor 9 on the top end face of the housing 3 prevents deformation of the top end face of the housing 3 due to excessive local pressure; the retaining ring 10 is embedded in the mounting groove through an interference fit, which can prevent the retaining ring 10 from rotating circumferentially or moving axially during use, ensuring that the support for the angle sensor 9 is always stable; in addition, the setting of the retaining ring 10 also facilitates the disassembly and assembly of the angle sensor 9. When it is necessary to disassemble the angle sensor 9, the angle sensor 9 can be directly removed after unscrewing the screw, and the retaining ring 10 remains in the mounting groove, which will not affect the subsequent reinstallation and positioning of the angle sensor 9.

[0028] Reference Figure 2 , Figure 5 , Figure 6One embodiment shown is as follows: The simplified two-speed shifting mechanism has a motor 1 that can rotate in both directions. In this embodiment, the motor 1 is a DC servo motor 1. The control terminal of the motor 1 is electrically connected to an external control unit via a wire. The control unit can output forward and reverse control signals to control the motor 1 to rotate clockwise (forward) or counterclockwise (reverse). When the motor 1 rotates clockwise, the output terminal of the motor 1 drives the lead screw 4 to rotate clockwise. The external thread of the lead screw 4 meshes with the internal thread of the lead screw nut 5. Since the lead screw nut 5 and the shift fork 6 are circumferentially fixed, the clockwise rotation of the lead screw 4 causes the lead screw nut 5 to move along the axis of the lead screw 4 from the end closer to the motor 1 to the end farther away from the motor 1. The movement of the lead screw nut 5 drives the shift fork 6 to rotate counterclockwise around the axis of its connecting part via a flat key. The fork body of the shift fork 6 rotates accordingly and inserts into the first gear slot of the component to be shifted until the angle sensor 9 detects that the shift fork 6 has rotated to the preset first gear angle. The control unit then... When motor 1 stops rotating forward, shift fork 6 is stably in the first gear position. When motor 1 reverses, the output end of motor 1 drives lead screw 4 to rotate counterclockwise. The counterclockwise rotation of lead screw 4 causes lead screw nut 5 to move along the axis of lead screw 4 from the end away from motor 1 to the end closer to motor 1. The movement of lead screw nut 5 drives shift fork 6 to rotate clockwise around the axis of its connecting part via a flat key. The fork body of shift fork 6 rotates accordingly and exits from the first gear slot, and then inserts into the second gear slot of the gear-shifting component until angle sensor 9 detects that shift fork 6 has rotated to the preset second gear angle. The control unit controls motor 1 to stop reversing, and shift fork 6 is stably in the second gear position. The axial movement of lead screw nut 5 is controlled by the number of rotations of motor 1. When motor 1 rotates forward, the maximum movement of lead screw nut 5 corresponds to the angle at which shift fork 6 rotates to the first gear position. When motor 1 reverses, the maximum movement of lead screw nut 5 corresponds to the angle at which shift fork 6 rotates to the second gear position.

[0029] The implementation principle is as follows: The external control unit sends a forward or reverse control signal to motor 1 according to the shifting requirements. After receiving the forward signal, motor 1's internal rotor rotates clockwise, transmitting the rotational power to lead screw 4 via a coupling, causing lead screw 4 to rotate synchronously clockwise. Since lead screw 4 and lead screw nut 5 are screw-driven, the clockwise rotation of lead screw 4 is converted into linear motion of lead screw nut 5 along the axis of lead screw 4 away from motor 1. Lead screw nut 5 drives shift fork 6 to rotate counterclockwise via a key. The fork 6 gradually approaches and inserts into the first gear slot of the component to be shifted. Angle sensor 9 detects the rotation angle of shift fork 6 in real time. When the angle reaches the preset value for the first gear, angle sensor 9 sends a signal to the control unit. Upon receiving the positioning signal, the control unit cuts off the forward rotation power to motor 1, causing motor 1 to stop rotating. The lead screw nut 5 and shift fork 6 also stop moving, achieving the first gear shift. When switching to the second gear is required, the control unit sends a reverse signal to motor 1, causing the motor 1 rotor to rotate counter-clockwise. This causes the lead screw 4 to rotate counter-clockwise, and the lead screw nut 5 to move closer to motor 1 along the axis of lead screw 4. The shift fork 6 rotates clockwise, exiting the first gear slot and inserting into the second gear slot. When the angle sensor 9 detects that the shift fork 6 has reached the second gear angle, the control unit cuts off the reverse rotation power to motor 1, completing the second gear shift. The entire process achieves two-gear switching through the forward and reverse rotation control of motor 1, with a clear transmission path and precise, controllable shifting action.

[0030] The working principle of this device is as follows: An external control unit sends a forward or reverse rotation signal to motor 1 according to the gear shifting requirements. Upon receiving the signal, motor 1 rotates, driving the lead screw 4 to rotate synchronously via the coupling. Because the lead screw 4 and lead screw nut 5 are screw-fitted, the rotation of the lead screw 4 is converted into linear movement of the lead screw nut 5 along the axial direction. Since the shift fork 6 is circumferentially fixed to the lead screw nut 5, the movement of the lead screw nut 5 drives the shift fork 6 to rotate around its own axis. While the shift fork 6 rotates, the angle sensor 9 detects its angle in real time and feeds the signal back to the control unit. When the shift fork 6 rotates to the target gear angle, the control unit cuts off the power to motor 1, motor 1 stops rotating, and the lead screw 4 and lead screw nut 5 stop moving accordingly. The shift fork 6 stabilizes at the corresponding gear position, completing the gear shift. During the process, the side cover of motor 1 ensures that motor 1 and housing 3 are coaxially sealed, the vent plug 8 balances the air pressure inside and outside housing 3, and the retaining ring 10 fixes the angle sensor 9. All components work together to ensure accurate and stable gear shifting.

[0031] The working principle of this device has been explained through the above embodiments. These embodiments only illustrate several implementation methods of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A simplified two-speed shifting mechanism, characterized in that: include: Shell (3); Motor (1), the motor (1) is fixedly connected to housing (3); Lead screw (4), which is connected to the output end of motor (1) for transmission; The lead screw nut (5) and the lead screw (4) form a helical transmission engagement; The shift fork (6) and the lead screw nut (5) form a circumferentially fixed transmission engagement; An angle sensor (9) is mounted on the housing (3) and is used to detect the shift position.

2. A simplified two-gear shifting mechanism according to claim 1, characterized in that: It also includes a motor (1) side cover, which is located between the motor (1) and the housing (3). One side of the motor (1) side cover is attached to the end face of the motor (1), and the other side is attached to the end face of the housing (3).

3. A simplified two-gear shifting mechanism according to claim 1, characterized in that: It also includes a sensor shaft (7), which passes through the mating point between the shift fork (6) and the lead screw nut (5), and the sensor shaft (7) and the shift fork (6) form a circumferential fixed fit.

4. A simplified two-gear shifting mechanism according to claim 1, characterized in that: The top of the housing (3) is provided with a vent hole, and a vent plug (8) is provided at the vent hole. The venting channel of the vent plug (8) is connected to the inner cavity of the housing (3).

5. A simplified two-speed shifting mechanism according to claim 1, characterized in that: It also includes a retaining ring (10), which is embedded in the mounting groove of the housing (3). One side of the retaining ring (10) abuts against the end face of the angle sensor (9), and the other side contacts the housing (3).

6. A simplified two-gear shifting mechanism according to claim 1, characterized in that: The motor (1) can rotate in both directions. When the motor (1) rotates in the forward direction, it drives the lead screw (4) to rotate and drives the lead screw nut (5) to move axially, thereby driving the shift fork (6) to rotate to the first gear. When the motor (1) rotates in the reverse direction, it drives the lead screw (4) to rotate and drives the lead screw nut (5) to move axially, thereby driving the shift fork (6) to rotate to the second gear.

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