Gear shifting trend sensor

Abstract

A gear shifting trend sensor comprises a shell, an electric appliance box for placing the sensor is arranged outside the shell, and a push-pull shaft, a reset spring for driving the push-pull shaft to reset and a magnet which is fixed on the push-pull shaft and moves along with the push-pull shaft are arranged in the shell. When the magnet is in an initial state, the position of the magnet corresponds to the position of a sensor outside the shell, when the push-pull shaft is pushed in and pulled out, the push-pull shaft is reset through spring force obtained by compressing the same reset spring, and the push-in stroke and the pull-out stroke of the push-pull shaft are consistent. The utility model has the beneficial effects that the same reset spring is compressed in the push-in direction and the pull-out direction of the push-pull shaft in the technical scheme, so that the consistency of spring force is ensured, and the reset deviation caused by non-uniform stress of the spring is avoided.

Description

Technical Field

[0001] The utility model relates to a vehicle accessory, in particular to a gear shifting trend sensor. Background Art

[0002] In motorcycle transmission control systems, shift trend sensors play a key role, used to monitor the trend of shift operations in real time to optimize shift smoothness and response speed. Their application scenarios mainly involve motorcycles with automatic or semi-automatic transmissions. For example, during acceleration or deceleration, the sensor predicts shift requirements by detecting the movement trend of the shift lever, thereby assisting the electronic control unit (ECU) in adjusting engine torque or transmission parameters. During use, the sensor typically includes a push-pull shaft with a magnet or other magnetic sensing element mounted on it. When the rider operates the shift lever, the push-pull shaft is pushed or pulled, causing the position of the magnet to change; the sensor outputs a signal by detecting the change in magnetic flux to determine the push-in (upshift) or pull-out (downshift) trend. This process ensures the timeliness and accuracy of gear shifting and is widely used in the intelligent control of high-performance motorcycles and electric motorcycles to improve the driving experience and fuel efficiency.

[0003] Prior art reset solutions have significant flaws, primarily manifested in inconsistent reset forces. Specifically, one solution uses two independent springs for push-in and pull-out reset, but ensuring consistent manufacturing of the two springs is difficult, resulting in significant differences in reset spring force. Another solution utilizes the same spring in both tension and compression for reset, but insufficient spring machining precision results in uneven spring forces during compression and tension. These flaws ultimately cause the magnets mounted on the push-pull shaft to deviate from their initial positions after reset, reducing sensor detection accuracy and causing shift signal errors or instability, impacting the motorcycle's reliability and performance. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present invention provides a shift trend sensor that ensures that a magnet can be reset to an initial position by ensuring that the reset force of a reset spring is consistent.

[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a gear shift trend sensor, comprising a shell, an electrical box for placing the sensor is arranged outside the shell, a push-pull shaft, a reset spring for driving the push-pull shaft to reset, and a magnet fixed on the push-pull shaft and displaced along with the push-pull shaft are arranged inside the shell, and the magnet is arranged corresponding to the sensor position outside the shell in the initial state, and the push-pull shaft is reset by compressing the spring force obtained by compressing the same reset spring when the push-pull shaft is pushed in and pulled out, and the pushing-pull shaft has the same pushing and pulling stroke.

[0006] The beneficial effects of the present invention are as follows: the technical solution ensures the consistency of the spring force by using the same reset spring to compress the push-pull shaft in both the pushing and pulling directions, thereby avoiding reset deviations caused by uneven spring force. This ensures that the magnet can accurately return to its initial position when resetting, accurately corresponding to the sensor, and improving the detection accuracy and reliability of the sensor. At the same time, the consistency of the pushing and pulling strokes eliminates displacement errors, reduces mechanical wear caused by stroke asymmetry, and extends the life of the equipment. As a preferred embodiment, the reset spring can be designed as a symmetrical compression structure, such as a cylindrical coil spring, with its two ends respectively fixed to symmetrical mounting points on the push-pull shaft. When the push-pull shaft is pushed in, one end of the spring is pushed and compressed, and when it is pulled out, the other end is pulled and compressed. The compression amount of the spring is the same during the pushing and pulling process. Through this symmetrical layout, the spring force remains balanced during bidirectional operation, avoiding reset position offset caused by uneven spring deformation. In addition, as a preferred method, the preload force of the spring can be set to a constant value. For example, the spring is in a slightly preloaded state in the initial position. In this way, when the push-pull shaft moves, the compression force of the spring changes linearly and can be controlled, ensuring that the magnet reset trajectory is stable. The initial position alignment can be maintained without the need for additional adjustment mechanisms, which simplifies the sensor structure and reduces manufacturing complexity.

[0007] Furthermore, a spring guide sleeve and a spring pressure ring are provided on the push-pull shaft, and the reset spring is provided between the spring guide sleeve and the spring pressure ring. When the push-pull shaft is pushed in or pulled out, the spring guide sleeve and the spring pressure ring move toward each other to compress the reset spring.

[0008] This technical solution sets a spring guide sleeve and a spring pressure ring as the guide and compression components of the reset spring, ensuring that when the push-pull shaft is pushed in or pulled out, the two move in opposite directions to directly compress the reset spring, avoiding the spring from deflecting or twisting during the compression process, thereby maintaining the stability and consistency of the spring force. This improves the accuracy of the reset action, reduces energy loss, simplifies the mechanical structure, and reduces the failure rate caused by component friction. As a preferred method, the spring guide sleeve can be designed as a hollow tubular structure with a guide groove on its inner wall, and the spring pressure ring adopts an annular flange. The reset spring is nested in the guide sleeve. When the push-pull shaft moves, the relative movement of the guide sleeve and the pressure ring is linearly guided by the groove-flange combination. The spring will not be radially offset during axial compression, ensuring uniform transmission of the compression force. In addition, as a preferred method, the spring pressure ring can be integrated with a limiting function. For example, an elastic clip is provided on the edge of the pressure ring to form an adjustable gap with the end of the guide sleeve. The clip constrains the maximum compression stroke of the spring during the opposite movement to prevent over-compression and damage to the spring. This structure can automatically adjust the gap during pushing and pulling operations without the need for additional limiting elements, thereby improving the convenience and reliability of assembly.

[0009] Furthermore, when the push-pull shaft is pulled out, the spring guide sleeve remains in a relative position, and the spring pressure ring moves toward the spring guide sleeve to compress the reset spring; when the push-pull shaft is pushed in, the spring pressure ring remains in a relative position, and the spring guide sleeve moves toward the spring pressure ring to compress the reset spring.

[0010] This technical solution clarifies the specific movement modes of the spring guide sleeve and the spring pressure ring under different movement directions of the push-pull shaft: when pulling out, the pressure ring actively moves the compression spring, and when pushing in, the guide sleeve actively moves the compression spring. This separate movement design ensures that the reset spring is effectively compressed in both-way operations, while avoiding interference between components, improving response speed and reset accuracy. This reduces mechanical hysteresis, makes the magnet displacement smoother, and enhances the dynamic performance of the sensor. As a preferred method, the spring guide sleeve can be fixed to the bracket inside the shell to keep it stationary, and the spring pressure ring is connected to the push-pull shaft through a sliding bearing. When the push-pull shaft is pulled out, the pressure ring moves with the shaft and compresses the spring; when pushed in, the guide sleeve is pushed by the drive ring on the push-pull shaft to move the compression spring. This structure uses the rigid support of the bracket and bearing to ensure the linear motion path and prevent uneven spring force caused by skew. In addition, as a preferred method, the contact surface of the pressure ring and the guide sleeve can be designed with a low-friction coating, such as a polytetrafluoroethylene coating, to reduce frictional resistance during relative movement, making the compression process smoother and the spring force transmission more efficient, thereby achieving rapid reset in both pushing and pulling operations without the need for lubrication and maintenance.

[0011] Furthermore, a reset groove is provided in the shell for the spring guide sleeve and the spring pressure ring to move therein, and the spring pressure ring includes a limiting ring. One end of the spring guide sleeve is a closed ring and the closed ring abuts against the side of the reset groove toward the pulling direction of the push-pull shaft when the magnet is in the initial position, and the limiting ring abuts against the other side of the reset groove toward the pushing direction of the push-pull shaft when the magnet is in the initial position; the two ends of the corresponding reset groove on the push-pull shaft are provided with a first driving ring and a second driving ring which respectively abut against the closed ring and the limiting ring when the magnet is in the initial position.

[0012] This technical solution forms a precise abutment structure at the initial position through the cooperation of the reset groove, the limit ring and the drive ring, ensuring that the spring guide sleeve and the spring pressure ring can reliably maintain relative position or movement when the push-pull shaft is pulled out or pushed in, avoiding position drift during the reset process, and thus maintaining the stability of the initial position of the magnet. This improves the repeatability of the sensor, reduces cumulative errors, and simplifies the calibration process. As a preferred method, the reset groove can be designed as a rectangular guide rail structure, the inner wall of which is provided with a carbide wear-resistant layer, and the limit ring and the closing ring respectively form surface contact and abutment with the end face of the groove. When the push-pull shaft moves, the drive ring directly pushes the guide sleeve or pressure ring through the axial force of the push-pull shaft, and slides in the reset groove, ensuring that the motion trajectory is confined to the groove and does not rotate or deflect. This structure provides rigid constraints during the pushing and pulling process, so that the compression force of the reset spring is evenly distributed. In addition, as a preferred method, the drive ring can be set as an adjustable threaded ring, and its position on the push-pull shaft can be fine-tuned by threads, so that the abutment gap can be accurately set during the initial assembly to ensure that the magnet is aligned with the sensor when it is reset. No external tools are required for adjustment, which improves installation efficiency and long-term reliability.

[0013] Furthermore, the spring pressure ring also includes a compression ring, the return spring is arranged on the radial inner side of the spring guide sleeve, the other end of the spring guide sleeve has an opening, the compression ring is inserted into the spring guide sleeve and is used to prevent the return spring from falling out of the spring guide sleeve when relative movement occurs between the spring guide sleeve and the spring pressure ring.

[0014] This technical solution, through the cooperation of the compression ring and spring guide sleeve, completely contains the return spring radially inside the guide sleeve, effectively preventing the spring from dislodging or radially twisting during compression. This ensures that the spring force is always transmitted axially, avoiding fluctuations in the return force caused by spring deformation. This enhances the durability and consistency of the sensor, particularly reducing the risk of failure during frequent push-pull operations. Preferably, the compression ring can be designed as an annular member with an internal groove, its outer diameter slightly smaller than the inner diameter of the spring guide sleeve. The compression ring fits into the open end of the guide sleeve, with one end of the return spring secured within the compression ring groove and the other end secured to the closed end of the guide sleeve. During relative movement between the guide sleeve and the compression ring, the compression ring slides within the guide sleeve, keeping the spring constrained within the guide sleeve, preventing radial expansion or dislodging and ensuring a linear compression stroke. Furthermore, preferably, the open end of the spring guide sleeve can be provided with a chamfered guide edge, and the compression ring has a corresponding tapered mating surface. This tapered surface guides the spring during relative movement, reducing sticking and ensuring smoother spring compression. It also maintains axial alignment during both insertion and withdrawal, improving return accuracy.

[0015] Furthermore, the spring guide sleeve has an open end face that abuts against the limit ring and provides a travel limit for pulling out and pushing in the push-pull shaft.

[0016] This technical solution provides significant benefits in many aspects by setting the distance between the open end face of the spring guide sleeve and the limit ring as the common stroke for pulling out and pushing in the push-pull shaft. First, bidirectional reset is achieved with the help of the same return spring, which greatly simplifies the structure, reduces the number of parts, and reduces assembly complexity and cost. Second, the same push-pull stroke ensures accurate and consistent detection of shift trends, improves the symmetry of the sensor's response to shift operations, and makes the transmission of motorcycle shift signals more reliable. Third, this design forms a bidirectional limit between the spring guide sleeve and the limit ring, avoiding damage to components caused by excessive pushing and pulling, and extending service life. At the same time, the unified stroke specifications facilitate standardized production and enhance compatibility with different motorcycle shift mechanisms.

[0017] Furthermore, the other end of the push-pull shaft is sleeved with an oil seal and an oil sealing ring for preventing relative axial movement between the oil seal and the push-pull shaft.

[0018] By providing an oil seal and an oil seal ring, the oil seal provides a sealing effect superior to that of a sealing ring, effectively preventing external contaminants from entering the housing. The oil seal ring fixes the oil seal's position, preventing axial movement, ensuring the sensor's long-term dust and oil leakage resistance, and improving its durability in harsh environments. As a preferred method, the oil seal can adopt a lip seal structure, with its inner ring tightly fitting the push-pull shaft and the outer ring fixed in the housing groove, maintaining the seal through elastic deformation when the push-pull shaft moves. The oil seal ring adopts a retaining ring design, installed on the outside of the oil seal, and its rigid structure limits the axial movement of the oil seal. This combined design optimizes the sealing effect, reduces maintenance requirements, and enhances the overall reliability and service life of the sensor.

[0019] Furthermore, a fitting platform is provided on the shell, and the electrical box is directly molded on the fitting platform by injection molding.

[0020] The metal body is machined to ensure structural rigidity and provide reliable mechanical support for the product. The electrical box is injection molded and uses metal as an insert, which greatly reduces the amount of metal processing, reduces tool wear and labor costs, and is particularly suitable for mass production. The injection molded layer directly forms an insulating barrier to prevent short circuits caused by contact between the circuit board and the metal, which is more stable and reliable than adding insulating parts later. Phased processing can also optimize machining accuracy and injection molding parameters respectively, reducing the overall process difficulty and taking into account both performance and economy. As a preferred method, a square table and an embedding section are set on the embedding table, and a spiral line is set on the outer surface of the embedding section, so that no relative displacement occurs between the two after the electrical box is injection molded on the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0022] Figure 2 A cross-sectional view of an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the assembly of the reset groove of an embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the assembly of the push-pull shaft with the oil seal installed on one side of the embodiment of the utility model;

[0025] Figure 5 This is a disassembly diagram of an embodiment of the present utility model. DETAILED DESCRIPTION

[0026] The utility model embodiment of a shift trend sensor is as follows Figure 1-5 As shown: It includes a shell 1, and an electrical box 2 for placing a sensor 21 is provided outside the shell 1. The electrical box 2 is used to accommodate an external sensor 21 (such as a Hall sensor, etc., which belongs to the existing technology) to detect the magnet displacement signal. A push-pull shaft 3, a reset spring 4 for driving the push-pull shaft 3 to reset, and a magnet 5 fixed on the push-pull shaft 3 and displaced along with the push-pull shaft 3 are provided inside the shell 1. In the initial state, the magnet 5 is arranged to correspond to the position of the sensor 21 outside the shell 1 to ensure that the sensor 21 can accurately detect the change in the magnet position. When the push-pull shaft 3 is pushed in and pulled out, the spring force obtained by compressing the same reset spring 4 is used to achieve the reset of the push-pull shaft 3, and the push-pull shaft 3 is pushed in and pulled out with the same stroke, thereby ensuring that the magnet 5 can accurately return to the initial position when reset.

[0027] A spring guide sleeve 31 and a spring pressure ring 32 are provided on the push-pull shaft 3, with a return spring 4 disposed between the spring guide sleeve 31 and the spring pressure ring 32. When the push-pull shaft 3 is pushed in or pulled out, the spring guide sleeve 31 and the spring pressure ring 32 move toward each other to compress the return spring 4. Specifically, when the push-pull shaft 3 is pulled out, the spring guide sleeve 31 remains in a fixed relative position, while the spring pressure ring 32 moves toward the spring guide sleeve 31 to compress the return spring 4; when the push-pull shaft 3 is pushed in, the spring pressure ring 32 remains in a fixed relative position, while the spring guide sleeve 31 moves toward the spring pressure ring 32 to compress the return spring 4. This design ensures that the push-pull shaft 3 only compresses the return spring 4 during bidirectional movement, maintaining a consistent return force and thus ensuring that the initial position of the magnet does not change after it is reset.

[0028] A reset groove 11 is provided in the housing 1 for the spring guide sleeve 31 and the spring pressure ring 32 to move therein. The spring pressure ring 32 includes a limiting ring 321, and one end of the spring guide sleeve 31 is a closed ring 311. When the magnet 5 is in the initial position, the closed ring 311 abuts against one side of the reset groove 11 toward the pull-out direction of the push-pull shaft 3, and the limiting ring 321 abuts against the other side of the reset groove 11 toward the push-pull shaft 3. A first drive ring 33 and a second drive ring 34 are provided at both ends of the push-pull shaft 3 corresponding to the reset groove 11. When the magnet 5 is in the initial position, the first drive ring 33 abuts against the closed ring 311, and the second drive ring 34 abuts against the limiting ring 321, so as to realize the relative position control of the spring guide sleeve 31 and the spring pressure ring 32 when the push-pull shaft 3 moves.

[0029] The spring pressure ring 32 also includes a compression ring 322, and the return spring 4 is arranged radially inward of the spring guide sleeve 31. The other end of the spring guide sleeve 31 has an opening 312. The compression ring 322 is inserted into the spring guide sleeve 31 and is used to prevent the return spring 4 from escaping from the spring guide sleeve 31 when relative movement occurs between the spring guide sleeve 31 and the spring pressure ring 32, ensuring that the return spring 4 remains radially stable during the compression process. The end surface of the spring guide sleeve 31 with the opening 312 abuts against the limit ring 321, simultaneously providing a travel limit for pulling out and pushing in the push-pull shaft 3. In other words, the distance between the end surface of the spring guide sleeve 31 with the opening 312 and the limit ring 321 defines the bidirectional travel of the push-pull shaft 3.

[0030] The other end of the push-pull shaft 3 is sleeved with an oil seal 6 and an oil seal ring 7 to prevent relative axial movement between the oil seal 6 and the push-pull shaft 3. The oil seal 6 is used to seal the interior of the housing 1 (e.g., to prevent dust and water, which is conventional), and the oil seal ring 7 secures the oil seal 6 in place. The housing 1 is provided with a mating platform 12, and the electrical box 2 is directly molded onto the mating platform 12 by injection molding, achieving a secure connection.

[0031] The operating principle of this embodiment is as follows: When the push-pull shaft 3 is pushed in by an external force, the first drive ring 33 pushes the spring guide sleeve 31 toward the spring pressure ring 32, compressing the return spring 4 while the spring pressure ring 32 remains stationary. At the end of the push-pull stroke, the compression force of the return spring 4 drives the spring guide sleeve 31 in the opposite direction, causing the push-pull shaft 3 to return to its initial position. When the push-pull shaft 3 is pulled out, the second drive ring 34 pushes the spring pressure ring 32 toward the spring guide sleeve 31, compressing the return spring 4 while the spring guide sleeve 31 remains stationary. At the end of the pull-out stroke, the compression force of the return spring 4 drives the spring pressure ring 32 in the opposite direction, causing the push-pull shaft 3 to return to its initial position. The magnet 5 moves with the push-pull shaft 3, and its position change is detected by the sensor 21 in the electrical box 2, which outputs a shift trend signal. The push-pull shaft 3 has the same push-in and pull-out strokes and the same return force, ensuring that the magnet 5 accurately returns to its initial position each time it is reset, thereby improving detection accuracy.

[0032] The above embodiment is only one preferred embodiment of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A shift trend sensor, comprising a housing, an electrical box disposed outside the housing for housing the sensor, a push-pull shaft disposed within the housing, a return spring for returning the push-pull shaft to its original position, and a magnet fixed to the push-pull shaft and displaced along with the shaft, wherein the magnet is initially positioned relative to the sensor outside the housing, and characterized in that: When the push-pull shaft is pushed in or pulled out, the reset of the push-pull shaft is achieved by compressing the spring force obtained by the same reset spring, and the push-pull shaft has the same stroke when pushed in and pulled out.

2. The gear shift trend sensor according to claim 1, characterized in that: A spring guide sleeve and a spring pressure ring are provided on the push-pull shaft, and the reset spring is provided between the spring guide sleeve and the spring pressure ring. When the push-pull shaft is pushed in or pulled out, the spring guide sleeve and the spring pressure ring move toward each other to compress the reset spring.

3. The gear shift trend sensor according to claim 2, characterized in that: When the push-pull shaft is pulled out, the spring guide sleeve remains in a relatively fixed position, and the spring pressure ring moves toward the spring guide sleeve to compress the reset spring; when the push-pull shaft is pushed in, the spring pressure ring remains in a relatively fixed position, and the spring guide sleeve moves toward the spring pressure ring to compress the reset spring.

4. The gear shift trend sensor according to claim 3, characterized in that: A reset groove for the spring guide sleeve and the spring pressure ring to move therein is provided in the shell, and the spring pressure ring includes a limiting ring. One end of the spring guide sleeve is a closed ring and the closed ring abuts against one side of the reset groove toward the pulling direction of the push-pull shaft when the magnet is in the initial position, and the limiting ring abuts against the other side of the reset groove toward the pushing direction of the push-pull shaft when the magnet is in the initial position; the two ends of the corresponding reset groove on the push-pull shaft are provided with a first driving ring and a second driving ring which respectively abut against the closed ring and the limiting ring when the magnet is in the initial position.

5. The gear shift trend sensor according to claim 4, characterized in that: The spring pressure ring also includes a compression ring. The return spring is arranged on the radial inner side of the spring guide sleeve. The other end of the spring guide sleeve has an opening. The compression ring is inserted into the spring guide sleeve and is used to prevent the return spring from falling out of the spring guide sleeve when relative movement occurs between the spring guide sleeve and the spring pressure ring.

6. The gear shift trend sensor according to claim 5, characterized in that: The spring guide sleeve has an open end face which abuts against the limiting ring and provides a travel limit for pulling out and pushing in the push-pull shaft.

7. The gear shift trend sensor according to claim 1, characterized in that: The other end of the push-pull shaft is sleeved with an oil seal and an oil sealing ring for preventing relative axial movement between the oil seal and the push-pull shaft.

8. The gear shift trend sensor according to claim 1, characterized in that: The shell is provided with an embedding platform, and the electrical appliance box is directly formed on the embedding platform by injection molding.

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