Precise positioning derailleur and bicycle

Abstract

The utility model discloses a kind of accurate positioning transmission and bicycle.The transmission includes shell, gear set in shell and two angle sensors.Gear set is made of several gear shafts and transmission gears, wherein the end of two gear shafts of specific speed ratio is provided with angle sensor and sensor magnet synchronous with shaft rotation.Low-speed shaft sensor provides less than 360 degrees only angle interval positioning, high-speed shaft sensor provides high-resolution accurate angle reading, the information of both is combined, realizes to transmission output state without fuzzy, high-precision absolute position detection, effectively solve the single-sensor multi-circle counting fuzzy problem, ensure that accurate and reliable change is avoided and is jumped.The design structure is stable, especially suitable for multi-gear high-performance transmission system, improves the riding experience.

Description

Technical Field

[0001] This utility model relates to the field of bicycle parts technology, and in particular to a precision positioning gearbox and bicycle. Background Technology

[0002] Bicycle derailleurs perform gear shifting by switching the chain between multiple adjacent sprockets in the bicycle's sprocket assembly. Because the multiple sprockets have different sizes, the bicycle can change gears by coordinating the chain with different sprockets.

[0003] An electronic derailleur is generally constructed as follows: a base component is mounted on the frame of the riding device, and a chain guide component for guiding the chain is movably connected to the base component via a linkage component. Driven by a drive motor, the chain guide component moves the chain guide component between the sprockets of the sprocket assembly, causing the chain to shift from the initial sprocket to the target sprocket. The drive motor reduces and increases the output torque through a reduction gearbox.

[0004] However, inaccurate shifting is a common problem for cycling enthusiasts, especially with higher-speed chainrings. One major issue is that traditional derailleurs often suffer from low precision and inaccurate shifting due to uneven magnetization and limited accuracy of angle sensors. This problem becomes even more pronounced as the required precision increases with higher speeds. Utility Model Content

[0005] This invention provides a precision-positioning gearbox and bicycle, aiming to solve the problem of low shifting accuracy of existing bicycle gearboxes, especially at higher speeds, where inaccurate shifting is more likely to occur.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, embodiments of the present invention provide a precision positioning transmission, comprising: A transmission housing, wherein a gear set is disposed within the transmission housing; the gear set includes a plurality of gear shafts and a plurality of transmission gears disposed on the gear shafts; At least two angle sensors are provided, with the two angle sensors respectively disposed at the ends of two of the gear shafts.

[0007] In one embodiment, the ends of the two gear shafts corresponding to the two angle sensors are each provided with a sensor magnet that rotates synchronously with the gear shaft; A PCBA board is also provided inside the transmission housing, and the angle sensor is electrically connected to the PCBA board.

[0008] In one embodiment, the ends of the two gear shafts corresponding to the two angle sensors are fixedly connected to a support base, and the sensor magnet is fixedly mounted on the support base.

[0009] In one embodiment, the transmission housing includes an upper housing and a lower housing; The lower housing is provided with several support columns, and the top of the several support columns is provided with a support plate; one end of the several gear shafts is rotatably connected to the lower housing, and the other end is rotatably mounted on the support plate.

[0010] In one embodiment, two support holes corresponding to the angle sensor are provided through the support plate; A support bearing is provided inside the support hole; The support base includes a support column and a support plate, and the support column passes through the support bearing and is fixedly connected to the gear shaft. The support plate is provided with a support groove, and the sensor magnet is disposed in the support groove.

[0011] In one embodiment, a plurality of support rods are provided on the side of the support plate away from the lower housing, and the PCBA board is fixedly mounted on the support rods.

[0012] In one embodiment, a threaded hole is provided at the top of one of the support rods.

[0013] In one embodiment, the gear shaft corresponding to one of the angle sensors rotates at an angle less than 360 degrees.

[0014] In one embodiment, the angle sensor is disposed on the side of the PCBA board near the gear assembly.

[0015] Secondly, this utility model embodiment also provides a bicycle, including the aforementioned precision positioning gearbox.

[0016] The advantages of this invention compared to existing technologies are as follows: This application achieves high-precision detection of the gearbox rotation angle by setting angle sensors on two gear shafts and simultaneously monitoring the rotation angle of the two gear shafts. For example, if the angular velocities of the two gear shafts differ by a factor of ten, when the first magnet rotates 1 degree, the second magnet rotates 10 degrees. The rotation angle of the first magnet provides an approximate position, while the second magnet provides a precise angular position. The rotation angle of the first magnet is less than 360 degrees, ensuring the uniqueness of the position, while the second magnet can rotate more revolutions to ensure accuracy. This means that as the speed increases, more points need to be located within the same range, and the required accuracy increases accordingly. Only a higher-precision gearbox can guarantee accurate gear shifting, without slippage or skipping, meeting the higher demands of cycling enthusiasts.

[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of this utility model more obvious and understandable, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0018] Figure 1 An exploded view of a precision positioning transmission provided for an embodiment of this utility model; Figure 2 An exploded view of a precision positioning transmission from another angle, provided as an embodiment of this utility model; Figure 3 A three-dimensional structural diagram of a support seat for a precision positioning transmission provided in an embodiment of this utility model; Figure 4 A three-dimensional structural diagram of a precision positioning gearbox after removing the upper housing and PCBA board, provided for an embodiment of this utility model; Figure 5 A top view of a precision positioning transmission after removing the upper housing, provided for an embodiment of this utility model; Figure 6 for Figure 5 A cross-sectional view along the AA direction.

[0019] Figure label: 1. Gearbox housing; 11. Upper housing; 12. Lower housing; 13. Support column; 2. Gear set; 21. Gear shaft; 211. Input shaft; 212. Output shaft; 22. Transmission gear; 23. Motor. 3. Angle sensor; 4. Sensor magnet; 5. PCBA board, 51. Positioning hole, 52. Bolt; 6. Support plate; 61. Support rod; 62. Support hole; 63. Support bearing; 7. Support base, 71. Support column, 72. Support plate, 73. Support groove. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0022] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0023] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0024] Please see Figure 1-6 This utility model provides a precision positioning transmission, comprising: A transmission housing 1, wherein a gear set 2 is disposed within the transmission housing 1; the gear set 2 includes a plurality of gear shafts 21 and a plurality of transmission gears 22 disposed on the gear shafts 21; At least two angle sensors 3 are provided, with the two angle sensors 3 respectively disposed at the ends of the two gear shafts 21.

[0025] In the gear set 2 of the transmission, the gear set 2 is used to convert the high-speed, low-torque output of the motor 23 into a low-speed, high-torque output. Several gear shafts 21 are driven by gears, resulting in inconsistent rotational speeds for each gear shaft 21, with any two gear shafts 21 exhibiting a certain speed ratio. Therefore, this application achieves high-precision detection of the transmission's rotational angle by simultaneously monitoring the rotational angles of the two gear shafts 21 using angle sensors 3 on two gear shafts 21. For example, if the angular velocities of the two gear shafts 21 differ by a factor of ten, when the first magnet rotates 1 degree, the second magnet rotates 10 degrees. The rotational angle of the first magnet provides an approximate position, while the second magnet provides a precise angular position.

[0026] In specific settings, the gear shaft corresponding to one angle sensor rotates less than 360 degrees to ensure uniqueness of position, while the gear shaft corresponding to the second angle sensor can rotate more revolutions to ensure accuracy. This means that as speeds increase, more points need to be located within the same range, requiring higher precision. Only a higher-precision gearbox can guarantee accurate gear shifting, without slippage or skipping, meeting the higher demands of cycling enthusiasts.

[0027] In a further embodiment, angle sensors 3 can also be installed at the ends of three, four, or more gear shafts 21 to detect the angle of rotation of the transmission at more points.

[0028] Of the several gear shafts 21, one is an input shaft 211 and the other is an output shaft 212. The input shaft 211 is connected to the output end of the motor 23. The power of the motor 23 is transmitted to the output shaft 212 through the input shaft 211, and then through the several gear shafts 21 and the transmission gears 22.

[0029] In a further embodiment, such as Figure 1 and Figure 2 As shown, the ends of the two gear shafts 21 corresponding to the two angle sensors 3 are each provided with a sensor magnet 4 that rotates synchronously with the gear shaft 21; The transmission housing 1 is also provided with a PCBA board 5 (printed circuit board), and the angle sensor 3 is electrically connected to the PCBA board 5.

[0030] In this embodiment, sensor magnets 4 are provided at the ends of the two gear shafts 21. During the rotation of the gear shafts 21, the sensor magnets 4 can be driven to rotate, and the angle sensor 3 can detect the angle of rotation of the sensor magnets 4.

[0031] In this embodiment, the angle sensor 3 is located on the side of the PCBA board 5 near the gear set 2.

[0032] This reduces the distance between the angle sensor 3 and the sensor magnet 4, allowing the angle sensor 3 to more accurately monitor the rotation angle of the sensor magnet 4.

[0033] In a further embodiment, such as Figure 1 and Figure 2 As shown, the transmission housing 1 includes an upper housing 11 and a lower housing 12.

[0034] The lower housing 12 is provided with a plurality of support columns 13, and a support plate 6 is provided on the top of the plurality of support columns 13; one end of the plurality of gear shafts 21 is rotatably connected to the lower housing 12, and the other end is rotatably mounted on the support plate 6.

[0035] In this embodiment, the two ends of several gear shafts 21 are respectively rotatably mounted on the lower housing 12 and the support plate 6. This allows the gear set 2 to be positioned between the support plate 6 and the lower housing 12.

[0036] In a further embodiment, such as Figure 1 As shown, a plurality of support rods 61 are provided on the side of the support plate 6 away from the lower housing 12, and the PCBA board 5 is fixedly mounted on the support rods 61.

[0037] The support rod 61 is provided in three parts, and the PCBA board 5 is provided with three positioning holes 51 that cooperate with the three support rods 61.

[0038] The three positioning holes 51 and the three support rods 61 work together to form a triangular fixation, which allows the PCBA board 5 to be firmly fixed on the support rods 61.

[0039] In a further embodiment, one of the three support rods 61 has a threaded hole at its end. The PCBA board 5 can be fixed on the support rod 61 by the engagement of the bolt 52 and the threaded hole.

[0040] In a further embodiment, the ends of the two gear shafts 21 corresponding to the two angle sensors 3 are fixedly connected to support seats 7, and the sensor magnets 4 are fixedly mounted on the support seats 7.

[0041] The sensor magnet 4 is fixed by the support base 7, so that the sensor magnet 4 can be firmly fixed to the end of the gear shaft 21.

[0042] In a further embodiment, such as Figure 3 As shown, two support holes 62 corresponding to the angle sensor 3 are provided through the support plate 6; A support bearing 63 is provided inside the support hole 62; The support base 7 includes a support column 71 and a support plate 72. The support column 71 passes through the support bearing 63 and is fixedly connected to the gear shaft 21. The support plate 72 is provided with a support groove 73, and the sensor magnet 4 is disposed in the support groove 73.

[0043] In this embodiment, the support base 7 is fixedly connected to the gear shaft 21 via the support column 71, so that when the gear shaft 21 rotates, it can drive the sensor magnet 4 to rotate. Furthermore, during the rotation of the sensor magnet 4, the support column 71 is positioned within the support bearing 63, which reduces the frictional force experienced by the support column 71 during rotation.

[0044] In another embodiment, the present invention also provides a bicycle including the aforementioned precision positioning gearbox.

[0045] In this application, the transmission housing 1 contains a gear set 2 consisting of multiple gear shafts 21 and transmission gears 22. Power from the motor 23 is received via the input shaft 211, and after multiple speed changes via the gear set 2, low-speed, high-torque power is output from the output shaft 212. A fixed speed ratio exists between the different gear shafts 21.

[0046] An angle sensor 3 and a sensor magnet 4 that rotates synchronously with the shaft are respectively installed at the ends of two gear shafts 21 with a specific speed ratio (e.g., 10:1).

[0047] The low-speed axis (such as the first axis) rotates at a slower speed, and the range of rotation angle changes monitored by its sensors is small (e.g., less than 360 degrees). Its main function is to define a large, unique angular range to determine the approximate position of the spindle.

[0048] The high-speed axis (such as the second axis) rotates at a higher speed, and its sensor monitors a wide range of rotational angle changes (multiple rotations are possible). Its function is to provide high-resolution, accurate angle readings within a large range defined by the low-speed axis.

[0049] The angle information from the two angle sensors 3 is combined and processed. The information from the low-speed axis solves the "position ambiguity" problem that may occur when a single high-precision sensor 3 rotates multiple times, ensuring the uniqueness of the positioning; the information from the high-speed axis provides a fine angle value. Together, they achieve high-resolution, ambiguity-free absolute position detection of the transmission output state, which far exceeds the accuracy of a single sensor.

[0050] This application can also be extended to setting angle sensors 3 on three or more gear shafts 21, so as to achieve detection at more points and higher system redundancy accuracy through speed comparison at more levels.

[0051] To ensure measurement stability, this application designs a special support structure (support plate 6, support rod 61) to fix the PCBA board 5 of the angle sensor 3, and uses the support base 7 and support bearing 63 to ensure that the sensor magnet 4 and the gear shaft 21 rotate stably and synchronously with low friction, while shortening the distance between the sensor magnet 4 and the angle sensor 3 to improve signal quality.

[0052] Compared with the prior art, this application has the following advantages: (1) High precision and high resolution: The high-speed shaft angle sensor 3 is used to realize fine angle measurement, which meets the extremely high requirements of high-end transmission for positioning accuracy.

[0053] (2) Absolute position uniqueness: By limiting the large position range through the low-speed shaft sensor, the multi-turn counting ambiguity problem that may occur when using only a single-turn high-precision sensor 3 is eliminated, and unambiguous absolute position positioning is achieved.

[0054] (3) Precise and reliable gear shifting: The extremely high positioning accuracy and uniqueness directly ensure the precision of gear shifting during gear shifting, effectively avoiding faults such as "false shifting" (gear shifting not in place) and "gear skipping" (unexpected gear disengagement), and improving the certainty of gear shifting performance.

[0055] (4) Adapting to high-performance requirements: This design is particularly suitable for transmission systems with a high number of gears. The more gears there are, the higher the positioning accuracy requirement for the critical point of each gear is, and this solution can meet this requirement well.

[0056] (5) Stable and reliable structure: The installation structure of angle sensor 3 and sensor magnet 4 has been optimized, which makes it firmly fixed and reduces rotational friction and signal interference, ensuring measurement stability and durability for long-term use.

[0057] (6) Enhance user experience: Ultimately, it provides cycling enthusiasts with a faster, more accurate and more reliable shifting experience, satisfying their higher pursuit of bicycle handling performance.

[0058] This application improves the position detection capability of the transmission from the traditional "approximate range" or "high precision with ambiguity risk" to the level of "unique absolute high precision" through a "dual angle sensor 3-cooperation" electromechanical design.

[0059] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A precision positioning transmission, characterized in that, include: A transmission housing, wherein a gear set is disposed within the transmission housing; the gear set includes a plurality of gear shafts and a plurality of transmission gears disposed on the gear shafts; At least two angle sensors are provided, with the two angle sensors respectively disposed at the ends of two of the gear shafts.

2. The precision positioning transmission according to claim 1, characterized in that, The ends of the two gear shafts corresponding to the two angle sensors are each provided with a sensor magnet that rotates synchronously with the gear shaft; A PCBA board is also provided inside the transmission housing, and the angle sensor is electrically connected to the PCBA board.

3. The precision positioning transmission according to claim 2, characterized in that, Each of the two gear shafts corresponding to the two angle sensors is fixedly connected to a support base, and the sensor magnet is fixedly mounted on the support base.

4. The precision positioning transmission according to claim 3, characterized in that, The transmission housing includes an upper housing and a lower housing; The lower housing is provided with several support columns, and the top of the several support columns is provided with a support plate; one end of the several gear shafts is rotatably connected to the lower housing, and the other end is rotatably mounted on the support plate.

5. The precision positioning transmission according to claim 4, characterized in that, Two support holes corresponding to the angle sensor are provided through the support plate; A support bearing is provided inside the support hole; The support base includes a support column and a support plate, and the support column passes through the support bearing and is fixedly connected to the gear shaft. The support plate is provided with a support groove, and the sensor magnet is disposed in the support groove.

6. The precision positioning transmission according to claim 5, characterized in that, The support plate has several support rods on the side away from the lower housing, and the PCBA board is fixedly mounted on the support rods.

7. The precision positioning transmission according to claim 6, characterized in that, One of the support rods has a threaded hole at its top.

8. The precision positioning transmission according to claim 1, characterized in that, One of the angle sensors corresponds to a gear shaft that rotates at an angle less than 360 degrees.

9. The precision positioning transmission according to any one of claims 2 to 4, characterized in that, The angle sensor is located on the side of the PCBA board near the gear assembly.

10. A bicycle, characterized in that, Including the precision positioning transmission as described in any one of claims 1 to 9.

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