Middle transmission
By installing sensors in the mid-mounted transmission, the appropriate shift timing is determined based on the crank's rotation speed and position, thus solving the problem of severe vehicle vibration caused by inappropriate transmission shift timing and achieving a smoother shifting process.
Patent Information
- Application Number
- CN202423312724.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In existing technologies, improper gear shifting timing can lead to severe vehicle vibration.
A first sensor is installed in the mid-mounted gearbox to determine the crank rotation speed or position by the positional relationship between the fixed and rotating parts, and then to determine the appropriate shifting time based on the pedal torque or position.
It reduces the vibration intensity of the vehicle when shifting gears, thus improving the user's riding experience.
Smart Images
Figure CN223536922U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of transmission technology, and in particular to a mid-mounted transmission. Background Technology
[0002] Automatic gear shifting allows the transmission to shift gears at appropriate times, reducing manual operation and improving the user experience. Current technology typically determines shifting based on vehicle speed, neglecting the user's actual riding experience, which can lead to severe vehicle vibration during shifting. Utility Model Content
[0003] The purpose of this invention is to provide a mid-mounted transmission, which aims to solve the problem of severe vehicle vibration caused by inappropriate shifting timing in existing technologies.
[0004] This application provides a mid-mounted transmission, including a first drive shaft (10), a transmission mechanism (40), an output mechanism (50), and a first sensor (60); the two ends of the first drive shaft (10) are used to mount cranks (200), thereby rotating under the drive of the cranks (200); the transmission mechanism (40) is used to change the transmission path between the first drive shaft (10) and the output mechanism (50), so that the first drive shaft (10) drives the output mechanism (50) to rotate through different transmission paths; the first sensor (60) includes a fixed member (61) and a rotating member (62); the rotating member (62) is mounted on the first drive shaft (10), and the rotating member (62) is rotatable relative to the fixed member (61); the positional relationship between the fixed member (61) and the rotating member (62) is used to determine the rotational speed or position of the crank (200).
[0005] In one embodiment, the mid-mounted transmission further includes a housing (70), and the fastener (61) is mounted within the housing (70).
[0006] In one embodiment, the fixing member (61) includes a mounting housing (611) and at least one Hall element (612) mounted within the mounting housing (611), and the rotating member (62) includes a magnet.
[0007] In one embodiment, a protrusion (613) is provided on the outer side of the mounting shell (611), and the protrusion (613) is fixedly installed inside the outer shell (70).
[0008] In one embodiment, the fastener (61) is sleeved on the first drive shaft (10).
[0009] In one embodiment, the mid-mounted transmission further includes an input mechanism (30) and a second drive shaft (20), the first drive shaft (10) and the second drive shaft (20) being arranged in parallel, the first drive shaft (10) being used to drive the second drive shaft (20) to rotate via the input mechanism (30), and the second drive shaft (20) being used to drive the output mechanism (50) to rotate via the transmission mechanism (40).
[0010] In one embodiment, the input mechanism (30) includes a first input gear (31) fixedly mounted on the first transmission shaft (10) and a second input gear (32) fixedly mounted on the second transmission shaft (20), the first input gear (31) and the second input gear (32) meshing; the first input gear (31) is used to rotate under the drive of the first transmission shaft (10), thereby driving the second transmission shaft (20) to rotate through the second input gear (32); the first input gear (31) is provided with a mounting hole, and the rotating member (62) is installed in the mounting hole.
[0011] In one embodiment, the transmission mechanism (40) includes a plurality of first transmission gears (41) mounted on the first transmission shaft (10), a plurality of second transmission gears (42) mounted on the second transmission shaft (20), and a shifting mechanism (43) mounted on the second transmission shaft (20). Each first transmission gear (41) meshes with a corresponding second transmission gear (42). The shifting mechanism (43) is used to cause one of the second transmission gears (42) to rotate under the drive of the second transmission shaft (20), thereby driving the output mechanism (50) to rotate through the corresponding first transmission gear (41).
[0012] In one embodiment, the output mechanism (50) includes an output sleeve (51) sleeved on the first drive shaft (10), the first drive gear (41) is mounted on the output sleeve (51), and the output sleeve (51) is used to mount the crankset (300).
[0013] In one embodiment, the mid-mounted transmission further includes a second sensor (80) mounted on the second drive shaft (20) for detecting the torque of the input mechanism (30).
[0014] The beneficial effects of the mid-mounted transmission provided by this utility model are as follows: A first sensor 60 is installed inside the mid-mounted transmission. The first sensor 60 includes a fixed member 61 and a rotating member 62 mounted on the first drive shaft 10. The rotational speed or position of the crank 200 can be determined based on the positional relationship between the fixed member 61 and the rotating member 62. Based on the rotational speed and position of the crank 200, the pedal torque or pedal position can be determined, thereby determining the appropriate shifting timing based on the pedal torque or pedal position, which can reduce the vibration intensity of the vehicle during shifting. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.
[0016] Figure 1 An assembly drawing of the mid-mounted transmission and crankshaft provided for an embodiment of this utility model;
[0017] Figure 2 An assembly diagram of the internal structure of the mid-mounted transmission provided in an embodiment of this utility model;
[0018] Figure 3 This is a schematic diagram of the internal structure of the mid-mounted transmission provided in an embodiment of the present utility model;
[0019] Figure 4 A schematic diagram from another perspective of a mid-mounted transmission provided for an embodiment of this utility model;
[0020] Figure 5 A cross-sectional view of the mid-mounted transmission provided for an embodiment of this utility model;
[0021] Figure 6 This is a schematic diagram of the shifting mechanism of a mid-mounted transmission provided in an embodiment of the present invention.
[0022] The following are the labeling elements in the figure:
[0023] 10. First drive shaft; 20. Second drive shaft; 30. Input mechanism; 31. First input gear; 32. Second input gear; 40. Speed change mechanism; 41. First transmission gear; 42. Second transmission gear; 43. Gear shifting mechanism; 431. Pawl; 432. Drive mechanism; 50. Output mechanism; 51. Output sleeve; 60. First sensor; 61. Fixing component; 611. Mounting housing; 612. Hall element; 613. Protrusion; 62. Rotating component; 70. Housing; 80. Second sensor; 200. Crank; 300. Chainring. Detailed Implementation
[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.
[0025] Throughout this specification, references to "an embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.
[0026] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "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 this 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 this utility model.
[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.
[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0029] Please refer to Figures 1 to 6 The mid-mounted transmission in the embodiments of this utility model will now be described.
[0030] The mid-drive transmission includes a first driveshaft 10, a transmission mechanism 40, an output mechanism 50, and a first sensor 60. The two ends of the first driveshaft 10 are used to mount cranks 200, so that the cranks 200 drive the cranks 200 to rotate. The transmission mechanism 40 is used to change the transmission path between the first driveshaft 10 and the output mechanism 50, so that the first driveshaft 10 drives the output mechanism 50 to rotate through different transmission paths. The first sensor 60 includes a fixed member 61 and a rotating member 62. The rotating member 62 is mounted on the first driveshaft 10 and is rotatable relative to the fixed member 61. The positional relationship between the fixed member 61 and the rotating member 62 is used to determine the rotational speed or position of the cranks 200.
[0031] Specifically, when the user presses the pedal, the crank 200 rotates, which in turn drives the first driveshaft 10 to rotate. The first driveshaft 10 then drives the output mechanism 50 to rotate via the transmission mechanism 40. The output mechanism 50 connects to the chainring 300 and other mechanisms that provide power to the vehicle, thus propelling it forward. The crank 200 and the rotating component 62 are mounted on the first driveshaft 10. Therefore, based on the positional relationship between the fixed component 61 and the rotating component 62, the rotation angle of the first driveshaft 10 relative to the fixed component 61 and its rotational speed can be determined. This, in turn, determines the rotation angle of the crank 200 relative to the fixed component 61 and its rotational speed. Since the fixed component 61 is fixed to the vehicle, the rotation angle of the crank 200 relative to the vehicle can be determined based on its rotation angle relative to the fixed component 61. This, in turn, determines the position of the crank 200, i.e., the position of the pedal. The rotational speed of the crank 200 determines the cadence. By controlling the shifting of the mid-mounted transmission based on the pedal position or cadence, the appropriate shifting timing can be determined. For example, when shifting gears is required, the system can determine when one of the pedals is at its highest position or when the pedaling speed is at its minimum. This ensures that the motor's output torque is lower during gear shifts, reducing vehicle vibration and improving the user's riding experience.
[0032] In one embodiment, the mid-mounted transmission also includes a housing 70, and a fastener 61 is installed inside the housing 70, thereby integrating the first sensor 60 into the mid-mounted transmission and saving installation space.
[0033] In one embodiment, the fastener 61 is fitted onto the first drive shaft 10, thereby saving installation space.
[0034] In one embodiment, the first sensor 60 is a Hall sensor, the fixing member 61 includes a mounting housing 611 and at least one Hall element 612 mounted within the mounting housing 611, and the rotating member 62 includes a magnet. For example, the Hall elements 612 are evenly arranged on a circuit board within the mounting housing 611, and the rotating member 62 includes a magnet. Based on the initial and current positions of the magnet detected by any one of the Hall elements 612, the current position of the crank 200 can be determined, and based on the time it takes for the magnet to move from the initial position to the current position, the rotational speed of the crank 200 can be determined.
[0035] In one embodiment, a protrusion 613 is provided on the outer side of the mounting shell 611. The protrusion 613 is provided with a mounting hole. The protrusion 613 is fixedly installed in the outer shell 70 through the mounting hole, thereby improving the fixing strength between the mounting shell 611 and the outer shell 70.
[0036] In one embodiment, the mid-drive transmission is a parallel-shaft transmission. Specifically, the mid-drive transmission includes a first driveshaft 10, a second driveshaft 20, an input mechanism 30, a transmission mechanism 40, an output mechanism 50, a first sensor 60, and a housing 70. The first driveshaft 10 and the second driveshaft 20 are arranged in parallel. Cranks 200 are mounted at both ends of the first driveshaft 10, so that it rotates under the drive of the cranks 200, and then drives the second driveshaft 20 to rotate through the input mechanism 30. The transmission mechanism 40 is used to change the transmission path between the second driveshaft 20 and the output mechanism 50, so that the second driveshaft 20 drives the output mechanism 50 to rotate through different transmission paths.
[0037] In another embodiment, the mid-mounted transmission may also have only one driveshaft, on which the rotating element in the first sensor 60 is mounted.
[0038] In one embodiment, the input mechanism 30 includes a first input gear 31 fixedly mounted on a first drive shaft 10 and a second input gear 32 fixedly mounted on a second drive shaft 20, wherein the first input gear 31 and the second input gear 32 mesh. The first input gear 31 is used to rotate under the drive of the first drive shaft 10, thereby driving the second drive shaft 20 to rotate via the second input gear 32. A mounting hole is provided on the first input gear 31, and a rotating component 62 is installed in the mounting hole. Since the first input gear 31 rotates synchronously with the first drive shaft 10, installing the rotating component 62 in the mounting hole of the first input gear 31 allows the positional relationship between the first drive shaft 10 and the housing 70 to be determined based on the positional relationship between the rotating component 62 and the fixed component 61, while saving installation space.
[0039] In one embodiment, the transmission mechanism 40 includes a plurality of first transmission gears 41 mounted on a first transmission shaft 10, a second transmission gear 42 mounted on a second transmission shaft 20, and a shift mechanism 43 mounted on the second transmission shaft 20. Each first transmission gear 41 meshes with a corresponding second transmission gear 42. The shift mechanism 43 is used to cause one of the second transmission gears 42 to rotate under the drive of the second transmission shaft 20, thereby driving the output mechanism 50 to rotate through the corresponding first transmission gear 41. Specifically, the shift mechanism 43 locks one of the second transmission gears 42 to the second transmission shaft 20. When the second transmission shaft 20 rotates under the drive of the first transmission shaft 10, the second transmission shaft 20 drives one of the second transmission gears 42 to rotate, which in turn drives the first transmission gear 41 meshing with the second transmission gear 42 to rotate, and the first transmission gear 41 then drives the output mechanism 50 to rotate. Different second transmission gears 42 have different numbers of teeth, and different first transmission gears 41 also have different numbers of teeth. Different second transmission gears 42 correspond to different gears. By locking different second transmission gears 42 with the second transmission shaft 20, the transmission route between the second transmission shaft 20 and the output mechanism 50 can be changed to obtain different output speeds and achieve speed change.
[0040] In one embodiment, the output mechanism 50 includes an output sleeve 51 sleeved on the first drive shaft 10, and a first drive gear 41 is mounted on the output sleeve 51. The output sleeve 51 is used to mount the chainring 300, thereby saving installation space of the output mechanism 50 and reducing the size of the mid-mounted gearbox.
[0041] In one embodiment, the shifting mechanism 43 includes a pawl 431 and a drive mechanism 432. The drive mechanism 432 drives the pawl 431 to rotate, causing the pawl 431 to engage with one of the second transmission gears 42, thereby locking the second transmission gear 42 with the second transmission shaft 20, and thus rotating under the drive of the second transmission shaft 20. For example, the pawl 431 is installed inside the second transmission shaft 20, and the drive mechanism 432 drives the pawl 431 to rotate, causing one end of the pawl 431 to lift up and engage with one of the second transmission gears 42, thereby locking the second transmission gear 42 with the second transmission shaft 20.
[0042] In one embodiment, the number of first transmission gears 41 is 7 and the number of second transmission gears 42 is 7, thereby enabling 7-speed transmission.
[0043] In one embodiment, the mid-mounted transmission further includes a second sensor 80 mounted on the second driveshaft 20 for detecting the torque of the input mechanism 30. For example, the second sensor 80 is a torque sensor, which can detect the torque of the input mechanism 30 and then determine the appropriate shift timing based on the torque of the input mechanism 30.
[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A mid-mounted transmission, characterized in that, The system includes a first drive shaft (10), a transmission mechanism (40), an output mechanism (50), and a first sensor (60). The first drive shaft (10) has cranks (200) mounted at both ends, allowing it to rotate under the drive of the cranks (200). The transmission mechanism (40) changes the transmission path between the first drive shaft (10) and the output mechanism (50), allowing the first drive shaft (10) to drive the output mechanism (50) to rotate via different transmission paths. The first sensor (60) includes a fixed member (61) and a rotating member (62). The rotating member (62) is mounted on the first drive shaft (10) and is rotatable relative to the fixed member (61). The positional relationship between the fixed member (61) and the rotating member (62) is used to determine the rotational speed or position of the crank (200).
2. The mid-mounted transmission according to claim 1, characterized in that, The mid-mounted transmission also includes a housing (70), and the fastener (61) is installed inside the housing (70).
3. The mid-mounted transmission according to claim 2, characterized in that, The fixing member (61) includes a mounting housing (611) and at least one Hall element (612) mounted in the mounting housing (611), and the rotating member (62) includes a magnet.
4. The mid-mounted transmission according to claim 3, characterized in that, The mounting shell (611) has a protrusion (613) on its outer side, and the protrusion (613) is fixedly installed inside the outer shell (70).
5. The mid-mounted transmission according to claim 1, characterized in that, The fastener (61) is sleeved on the first drive shaft (10).
6. The mid-mounted transmission according to claim 1, characterized in that, The mid-mounted transmission also includes an input mechanism (30) and a second drive shaft (20). The first drive shaft (10) and the second drive shaft (20) are arranged in parallel. The first drive shaft (10) is used to drive the second drive shaft (20) to rotate through the input mechanism (30), and the second drive shaft (20) is used to drive the output mechanism (50) to rotate through the transmission mechanism (40).
7. The mid-mounted transmission according to claim 6, characterized in that, The input mechanism (30) includes a first input gear (31) fixedly mounted on the first transmission shaft (10) and a second input gear (32) fixedly mounted on the second transmission shaft (20), the first input gear (31) and the second input gear (32) meshing; the first input gear (31) is used to rotate under the drive of the first transmission shaft (10), thereby driving the second transmission shaft (20) to rotate through the second input gear (32); the first input gear (31) is provided with a mounting hole, and the rotating part (62) is installed in the mounting hole.
8. The mid-mounted transmission according to claim 6, characterized in that, The transmission mechanism (40) includes a plurality of first transmission gears (41) mounted on the first transmission shaft (10), a plurality of second transmission gears (42) mounted on the second transmission shaft (20), and a shifting mechanism (43) mounted on the second transmission shaft (20). Each first transmission gear (41) meshes with a corresponding second transmission gear (42). The shifting mechanism (43) is used to cause one of the second transmission gears (42) to rotate under the drive of the second transmission shaft (20), thereby driving the output mechanism (50) to rotate through the corresponding first transmission gear (41).
9. The mid-mounted transmission according to claim 8, characterized in that, The output mechanism (50) includes an output sleeve (51) sleeved on the first drive shaft (10), the first drive gear (41) is mounted on the output sleeve (51), and the output sleeve (51) is used to mount the crankset (300).
10. The mid-mounted transmission according to claim 6, characterized in that, The mid-mounted transmission also includes a second sensor (80) mounted on the second drive shaft (20) for detecting the torque of the input mechanism (30).