Centrally-mounted motor based on gear driving

Abstract

The invention discloses a middle motor based on gear driving, and belongs to the technical field of motors. Crank assemblies are arranged at the two ends of the middle shaft; the gear box is used for transmitting power of the output shaft of the motor body to the middle shaft; the mounting frame is used for supporting the middle shaft to rotate and is used for mounting a gear box, and the gear box is detachably connected with the mounting frame so as to replace gear boxes with different gear ratios; wherein the gearbox is provided with an output shaft through hole and a middle shaft through hole, a gear in the output shaft through hole is in axial sliding fit with the output shaft of the motor body to form separable power connection, and a gear in the middle shaft through hole is in axial sliding fit with the middle shaft to form separable power connection. The modular design of the motor gearbox in the device improves the product universality, a user can quickly replace gearboxes with different tooth ratios according to scene requirements, and the detachable design of the gearboxes enables the whole operation to be convenient and quick without tools.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a mid-mounted motor driven by gears. Background Art

[0002] With the popularization of electric assisted bicycles, electric bicycles, shared electric vehicles and other means of transportation, users' requirements for riding comfort, power performance and maintainability are increasing.

[0003] The gearbox of an existing mid-mounted motor is usually an integral structure. The crank or bottom bracket assembly needs to be disassembled during installation. The replacement process is cumbersome and requires high user operating skills, which limits the development of modular replacement and multi-gear ratio adaptation of the gearbox. Different usage scenarios (such as commuting, load-carrying, and off-roading) have very different gear ratio requirements, and the existing motor system is usually only equipped with a single gear ratio gearbox, which makes it difficult to meet the user's personalized needs for different road conditions and riding habits, resulting in a limited user experience.

[0004] To this end, a mid-mounted motor based on gear drive is provided to solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a mid-mounted motor based on gear drive, which solves the problem that the existing mid-mounted motor gear transmission is mostly a fixed structure and cannot take into account the needs of different scenarios.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions: A mid-mounted motor based on gear drive, comprising: Motor body; A middle shaft, with crank assemblies provided at both ends of the middle shaft; A gearbox, used to transmit the power of the output shaft of the motor body to the central shaft; The mounting frame is used to support the rotation of the central shaft and to install the gear box. The gear box and the mounting frame are detachably connected to each other so as to replace the gear box with a different gear ratio.

[0007] In which, the gear box is provided with an output shaft through-hole and a central shaft through-hole, the gear in the output shaft through-hole is axially slidably matched with the output shaft of the motor body to form a detachable power connection, and the gear in the central shaft through-hole is axially slidably matched with the central shaft to form a detachable power connection; a slide groove is provided on the top of the gear box, and a slide rail matching the slide groove is provided on the mounting frame; a limit groove is also provided on the top of the gear box, and an elastically retractable limit member is provided on the mounting frame, and the limit member is inserted into the limit groove to limit the axial displacement of the gear box in the installed state; a handle groove is provided on the side of the gear box.

[0008] As a further optimization scheme of the present invention, a first wedge block is provided in the limit groove; the limit member includes a fixed seat, a movable rod movably penetrating the fixed seat, and a second wedge block and a top block fixed at both ends of the movable rod, and a spring is provided on the movable rod between the second wedge block and the fixed seat; the first wedge block squeezes the second wedge block to push the limit member to lift up and automatically insert into the limit groove.

[0009] As a further optimization scheme of the present invention, the gearbox is a split box structure, including a first box body and a second box body; the output shaft through-hole is arranged on the first box body, and the central axis through-hole is composed of two semicircular groove structures, which are respectively arranged at the joints of the first box body and the second box body.

[0010] As a further optimization solution of the present invention, it also includes a storage box for storing multiple gear boxes with different gear ratios. The storage box is fixed on the vehicle body and is provided with multiple installation slots.

[0011] As a further optimization scheme of the present invention, it also includes a locking member for penetrating the gear box, the limit member and the mounting frame to limit the radial displacement of the gear box; the locking member includes a plate body, and a positioning pin is provided at the lower part of the plate body, and the gear box, the limit member and the mounting frame are all provided with a positioning hole matching the positioning pin.

[0012] As a further optimization scheme of the present invention, the locking piece is also used to lift the limiting piece to release its limit on the gear box; the upper part of the plate body is slidably arranged in the top groove of the mounting frame, and a rotating shaft is fixed on the plate body, and a slot matching the rotating shaft is provided on the side wall of the top groove of the mounting frame; an elastic hook is provided on the upper bottom surface of the plate body, and a hook groove matching the elastic hook is provided on the top block, and the plate body rotates to lift the limiting piece.

[0013] As a further optimization solution of the present invention, a clamping block is provided at one end of the upper portion of the plate body, and a clamping slot that engages with the clamping block is provided at a corresponding position in the top groove of the mounting frame.

[0014] As a further optimization scheme of the present invention, it also includes a rotation adjustment mechanism for driving the mounting frame to rotate to adjust the height of the center axis; the rotation adjustment mechanism includes a support frame fixedly mounted on the vehicle body, an arc-shaped rack rotatably mounted on the support frame, and a driving unit for driving the arc-shaped rack to rotate, the axis of the arc-shaped rack coincides with the axis of the output shaft of the motor body, and the mounting frame is fixed on the arc-shaped rack.

[0015] As a further optimization solution of the present invention, the rotation angle of the mounting bracket is ±20°.

[0016] As a further optimization scheme of the present invention, the driving unit includes a first gear meshed with the arc-shaped rack, a second gear meshed with the first gear, and a straight rack meshed with the second gear; the first gear and the second gear are both rotatably arranged on the support frame, the straight rack is slidably arranged on the support frame, a connecting frame is fixed on the straight rack, and the connecting frame is fixed on the seat lifting rod to automatically adjust the center axis height when the seat height is adjusted.

[0017] The beneficial effects of the present invention are: 1. The modular design of the gearbox of the present invention improves the versatility of the product. Users can quickly replace gearboxes with different gear ratios according to scene requirements. The detachable design of the gearbox does not require tools for the entire operation, which is convenient and fast.

[0018] 2. The present invention can realize the rotation of the mounting frame around the axis of the motor body output shaft through the rotary adjustment mechanism, thereby adjusting the height of the center axis. This design improves riding comfort and is suitable for people of different heights. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional schematic diagram of the overall structure of the present invention Figure 1 ; Figure 2 A three-dimensional schematic diagram of the overall structure of the present invention Figure 2 ; Figure 3 Schematic diagram of the connection structure between the gear box and the mounting frame of the present invention Figure 1 ; Figure 4 Schematic diagram of the connection structure between the gear box and the mounting frame of the present invention Figure 2 ; Figure 5 This is a schematic diagram of the gearbox structure of the present invention; Figure 6 This is a cross-sectional view of the connection structure of the gear box, mounting bracket, and locking member of the present invention; Figure 7 It is a structural schematic diagram of the rotation adjustment mechanism of the present invention.

[0020] In the picture: 1. Motor body; 2. Gearbox; 201. First housing; 202. Second housing; 203. Output shaft hole; 204. Center shaft hole; 205. Handle slot; 206. Slide; 207. Limiting slot; 208. First wedge; 3. Mounting bracket; 301. Limiting member; 301a. Fixing seat; 301b. Movable rod; 301c. Second wedge; 301d. Spring; 301e. Top block; 301f. Hook slot; 302, slot hole; 303, card slot; 4, central axis; 5, rotation adjustment mechanism; 501, support frame; 502, arc-shaped rack; 503, first gear; 504, second gear; 505, straight rack; 506, connecting frame; 6, locking piece; 601, plate; 602, positioning pin; 603, rotating shaft; 604, card block; 605, elastic hook; 7, storage box; 701, mounting slot; 8, crank assembly. DETAILED DESCRIPTION

[0021] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0022] Example 1 In order to solve the problem that the existing mid-mounted motor gear transmission is mostly fixed structure, the gear ratio is not variable, and it cannot take into account the needs of different scenarios, please refer to Figure 1-Figure 3 、 Figure 5 The present invention provides a mid-mounted motor based on gear drive, comprising: Motor body 1; A middle shaft 4, with crank assemblies 8 provided at both ends of the middle shaft 4; The gearbox 2 is used to transmit the power of the output shaft of the motor body 1 to the central shaft 4; The mounting frame 3 is used to support the rotation of the central axis 4 and to install the gear box 2. A bearing for supporting the central axis 4 is provided in the mounting frame 3. The gear box 2 and the mounting frame 3 are detachably connected to each other so as to replace the gear box 2 with a different gear ratio. In order to improve the neatness of the overall appearance, a notch groove matching the shape of the gear box 2 is provided on the side of the mounting frame 3. When the gear box 2 is slidably installed on the mounting frame 3, the gear box 2 and the mounting frame 3 together form an overall structure that is approximately a rectangular parallelepiped.

[0023] Among them, the gear box 2 is provided with an output shaft through-hole 203 and a central shaft through-hole 204. The gear in the output shaft through-hole 203 slides axially with the output shaft of the motor body 1 to form a detachable power connection, and the gear in the central shaft through-hole 204 slides axially with the central shaft 4 to form a detachable power connection; a slide groove 206 is provided on the top of the gear box 2, and a slide rail matching the slide groove 206 is provided on the mounting frame 3 to guide the gear box 2 to slide and install along a predetermined trajectory. The cross-section of the slide groove 206 is T-shaped to limit the radial displacement of the gear box 2; a limit groove 207 is also provided on the top of the gear box 2, and an elastically retractable limit member 301 is provided on the mounting frame 3. The limit member 301 is inserted into the limit groove 207 to limit the axial displacement of the gear box 2 in the installed state; a handle groove 205 is provided on the side of the gear box 2 to assist users in disassembling or replacing the gear box 2.

[0024] like Figure 6 As shown, a first wedge block 208 is provided in the limiting groove 207; the limiting member 301 includes a fixed seat 301a, a movable rod 301b movably penetrating the fixed seat 301a, and a second wedge block 301c and a top block 301e fixed at both ends of the movable rod 301b, and a spring 301d is provided on the movable rod 301b between the second wedge block 301c and the fixed seat 301a; the first wedge block 208 squeezes the second wedge block 301c to push the limiting member 301 to lift up and automatically insert into the limiting groove 207.

[0025] When the gear box 2 is slid along the slide rail and installed on the mounting bracket 3, the second wedge block 301c cooperates with the first wedge block 208 to push the limit piece 301 upward and compress the spring 301d. After the gear box 2 is fully installed, the limit groove 207 is aligned with the limit piece 301, and the spring 301d releases energy to push the limit piece 301 to automatically insert into the limit groove 207, realizing automatic locking and axial limitation of the gear box 2; the limit piece 301 can realize automatic locking of the gear box 2 during the installation process, avoiding the risk of improper installation or loosening during operation. This structure can complete locking without additional operation, greatly improving installation efficiency and safety.

[0026] In order to achieve the replacement of the gearbox 2 without disassembling the crank assembly 8, so as to improve the replacement efficiency, as shown in FIG. Figure 3As shown, gearbox 2 is a split-body structure, comprising a first housing 201 and a second housing 202. An output shaft through-hole 203 is provided on first housing 201, while a center axle through-hole 204 comprises two semicircular grooves, located at the joint between first housing 201 and second housing 202. When first housing 201 and second housing 202 are joined, center axle through-hole 204 forms a complete through-hole for accommodating center axle 4. This eliminates the need to disassemble crank assembly 8 when replacing gearbox 2, significantly improving replacement efficiency and user experience while reducing maintenance costs. This makes it particularly suitable for scenarios requiring frequent configuration changes, such as shared electric vehicles, rental markets, and family-sharing vehicles.

[0027] like Figure 7 As shown, the vehicle also includes a storage box 7 for storing multiple gearboxes 2 with different gear ratios. Storage box 7 is fixed to the vehicle body and has multiple mounting slots 701, each of which is used to store a gearbox 2 with a specific gear ratio. The gearbox 2 uses a planetary gear structure or a helical gear set to achieve different gear ratio settings. For example, the commuter gearbox 2 (gear ratio of 1:5) is efficient and energy-saving, suitable for daily commuting; the heavy-duty gearbox 2 (gear ratio of 1:8) is suitable for high torque requirements and is suitable for high loads such as cargo or passengers; and the off-road gearbox 2 (gear ratio of 1:10) is suitable for strong climbing performance and is suitable for mountain biking or outdoor adventures. The multiple gearboxes 2 design makes the mid-mounted motor adaptable to multiple scenarios, such as outdoor cycling, with rapid switching between climbing, flat roads, and descents. In addition, for example, in a family-shared vehicle, a single vehicle can meet the different needs of the elderly (low speed and high torque) and the young (high speed and high efficiency).

[0028] During installation, the user holds the gear box 2 through the handle groove 205, aligns the T-shaped slide groove 206 on its top with the slide rail of the mounting frame 3, and slides axially along the predetermined trajectory. During the sliding process, the gear in the output shaft through-hole 203 gradually engages with the output shaft of the motor body 1 through the axial sliding structure, and the gear in the middle shaft through-hole 204 engages synchronously with the middle shaft 4. When the gear box 2 slides to the installation position, the limit piece 301 on the mounting frame 3 automatically springs into the limit groove 207 under the action of elastic force, completing axial locking. At this time, the gear box 2 and the mounting frame 3, the motor body 1, and the middle shaft 4 form a stable power transmission structure.

[0029] During power transmission, the output shaft of the motor body 1 rotates, and the power is transmitted to the gearbox 2 through the gear in the output shaft through-hole 203. After the gear box 2 changes speed with different gear ratios through the internal gear set to achieve different deceleration / speed-up effects, the power is transmitted to the central shaft 4 by the gear in the central shaft through-hole 204. The central shaft 4 drives the crank assemblies 8 at both ends to rotate, and finally drives the vehicle forward.

[0030] When replacing or disassembling, the user lifts the limit piece 301 to disengage it from the limit slot 207, pulls the gear box 2 outward through the handle slot 205, and the gear in the output shaft through-hole 203 and the gear in the middle shaft through-hole 204 disengage from the output shaft and middle shaft 4 of the motor body 1 respectively. The gear box 2 can be removed and the installation process is repeated when replacing the new gear box 2. The entire operation does not require tools and is convenient and fast.

[0031] Example 2 On the basis of embodiment 1, in order to further improve the installation stability of the gear box 2, as shown in FIG. Figure 4 、 Figure 6 As shown, it also includes a locking member 6 for passing through the gear box 2, the limit member 301 and the mounting frame 3 to limit the radial displacement of the gear box 2; the locking member 6 includes a plate body 601, and a positioning pin 602 is provided at the lower part of the plate body 601, and a positioning hole matching the positioning pin 602 is provided on the gear box 2, the limit member 301 and the mounting frame 3.

[0032] The locking member 6 is also used to lift the limit member 301 to release its limit on the gear box 2; the upper part of the plate body 601 is slidably arranged in the top groove of the mounting frame 3, and a rotating shaft 603 is fixed on the plate body 601, and a slot 302 matching the rotating shaft 603 is provided on the side wall of the top groove of the mounting frame 3; an elastic hook 605 is provided on the upper bottom surface of the plate body 601, and a hook groove 301f matching the elastic hook 605 is provided on the top block 301e, and the plate body 601 is rotated to lift the limit member 301.

[0033] Furthermore, a clamping block 604 is provided at one end of the upper portion of the plate body 601 , and a clamping slot 303 for clamping with the clamping block 604 is provided at a corresponding position in the top groove of the mounting frame 3 .

[0034] After the gearbox 2 is installed, the locking member 6 is inserted into the gearbox 2, the limiting member 301 and the positioning hole on the mounting bracket 3 in sequence through the positioning pin 602 at the bottom thereof, thereby locking the gearbox 2 in a limited position and preventing it from being displaced or falling off during operation. At this time, the plate 601 of the locking member 6 engages with the card slot 303 in the top groove of the mounting bracket 3 through the clamping block 604 at its end, thereby securing the locking member 6 in a limited position in the installed state, thereby ensuring the installation stability and operational safety of the gearbox 2. When the gearbox 2 needs to be replaced, the user pulls the plate 601 of the locking member 6 outwards, disengaging the clamping block 604 from the card slot 303, and at the same time driving the rotating shaft 603 to slide along the slot hole 302 on the side wall of the top groove of the mounting bracket 3, so that the positioning pin 602 gradually disengages from the gearbox 2, the limiting member 301 and the mounting bracket 3. positioning hole; when the plate body 601 is pulled to the outermost position, the positioning pin 602 is completely disengaged from the positioning hole. At this time, the elastic hook 605 at the bottom of the locking member 6 is stuck in the hook groove 301f on the top block 301e. Then, the user pulls the plate body 601 upward to rotate it around the rotating shaft 603, driving the elastic hook 605 to lift the limit member 301 upward, thereby releasing the limiting effect of the limit member 301 on the gear box 2. At this time, the gear box 2 can slide outward along the direction of the slide rail to complete the disassembly operation. The entire process does not require the use of tools, and the operation is simple, safe and reliable.

[0035] Example 3 On the basis of the first and second embodiments, in order to solve the problem that the middle shaft 4 in the existing mid-mounted motor structure has a fixed height and poor riding posture adaptability, as shown in FIG. Figure 7 As shown, it also includes a rotation adjustment mechanism 5 for driving the mounting bracket 3 to rotate to adjust the height of the central axis 4; the rotation adjustment mechanism 5 includes a support bracket 501 fixed on the vehicle body, an arc-shaped rack 502 rotatably arranged on the support bracket 501, and a driving unit for driving the arc-shaped rack 502 to rotate, the axis of the arc-shaped rack 502 coincides with the axis of the output shaft of the motor body 1, the mounting bracket 3 is fixed on the arc-shaped rack 502, and the rotation angle of the mounting bracket 3 is ±20°.

[0036] The driving unit includes a first gear 503 meshing with the arc-shaped rack 502, a second gear 504 meshing with the first gear 503, and a straight rack 505 meshing with the second gear 504; the first gear 503 and the second gear 504 are both rotatably arranged on the support frame 501, the straight rack 505 is slidably arranged on the support frame 501, and a connecting frame 506 is fixed on the straight rack 505, and the connecting frame 506 is fixed on the seat lifting rod to automatically adjust the height of the central axis 4 when the seat height is adjusted.

[0037] When the user adjusts the seat height, the seat lifting rod drives the connecting frame 506 to move, and the connecting frame 506 pushes the straight rack 505 to slide along the supporting frame 501. The straight rack 505 drives the arc rack 502 to rotate through the second gear 504 and the first gear 503, thereby driving the mounting frame 3 to rotate and adjust the height of the middle shaft 4. After the height of the middle shaft 4 is adjusted, the chain tension between the crank assembly 8 and the wheel also changes accordingly. A tensioning wheel can be provided at the chain to adapt to the change in chain tension to ensure the normal operation of the transmission system. This part of the structure is a conventional technical means in this field, so its specific structure will not be repeated here.

[0038] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A mid-mounted motor based on gear drive, characterized in that: include: Motor body (1); A middle shaft (4), with crank assemblies (8) provided at both ends of the middle shaft (4); A gearbox (2) for transmitting power from the output shaft of the motor body (1) to the central shaft (4); A mounting frame (3) for supporting the rotation of the central shaft (4) and for mounting the gear box (2), wherein the gear box (2) and the mounting frame (3) are detachably connected to each other so as to replace the gear box (2) with a different gear ratio; The gear box (2) is provided with an output shaft through-hole (203) and a center shaft through-hole (204), the gear in the output shaft through-hole (203) is axially slidably matched with the output shaft of the motor body (1) to form a separable power connection, and the gear in the center shaft through-hole (204) is axially slidably matched with the center shaft (4) to form a separable power connection; The top of the gear box (2) is provided with a slide groove (206), and the mounting frame (3) is provided with a slide rail matching the slide groove (206); The top of the gear box (2) is further provided with a limiting groove (207), and the mounting frame (3) is provided with an elastically retractable limiting member (301), the limiting member (301) being inserted into the limiting groove (207) to limit the axial displacement of the gear box (2) in the installed state; A handle groove (205) is provided on the side of the gear box (2).

2. A mid-mounted motor based on gear drive according to claim 1, characterized in that: A first wedge-shaped block (208) is provided in the limiting groove (207); The limiting member (301) comprises a fixed seat (301a), a movable rod (301b) movably penetrating the fixed seat (301a), and a second wedge block (301c) and a top block (301e) fixedly disposed at both ends of the movable rod (301b); a spring (301d) is sleeved on the movable rod (301b) between the second wedge block (301c) and the fixed seat (301a); The first wedge block (208) squeezes the second wedge block (301c) to push the limiting member (301) upwards and automatically insert it into the limiting groove (207).

3. The gear-driven mid-mounted motor according to claim 1, characterized in that: The gearbox (2) is a split box structure, comprising a first box (201) and a second box (202); The output shaft through-hole (203) is provided on the first box body (201), and the middle shaft through-hole (204) is composed of two semicircular groove structures, which are respectively provided at the joints between the first box body (201) and the second box body (202).

4. The gear-driven mid-mounted motor according to claim 1, characterized in that: It also includes a storage box (7) for storing a plurality of gear boxes (2) with different gear ratios. The storage box (7) is fixed on the vehicle body and is provided with a plurality of mounting slots (701).

5. The gear-driven mid-mounted motor according to claim 2, characterized in that: It also includes a locking member (6) for penetrating the gear box (2), the limiting member (301), and the mounting frame (3) to limit the radial displacement of the gear box (2); The locking member (6) comprises a plate body (601), a positioning pin (602) is provided at the lower portion of the plate body (601), and positioning holes matching the positioning pin (602) are provided on the gear box (2), the limiting member (301) and the mounting frame (3).

6. The gear-driven mid-mounted motor according to claim 5, characterized in that: The locking member (6) is also used to lift the limiting member (301) to release the limiting member from limiting the gear box (2); The upper portion of the plate body (601) is slidably disposed in the top groove of the mounting frame (3), and a rotating shaft (603) is fixedly disposed on the plate body (601), and a slot hole (302) matching the rotating shaft (603) is disposed on the side wall of the top groove of the mounting frame (3); An elastic hook (605) is provided on the upper bottom surface of the plate body (601), and a hook groove (301f) matching the elastic hook (605) is provided on the top block (301e). The plate body (601) rotates to lift the limiting member (301).

7. The gear-driven mid-mounted motor according to claim 6, characterized in that: A clamping block (604) is provided at one end of the upper portion of the plate body (601), and a clamping slot (303) that engages with the clamping block (604) is provided at a corresponding position in the groove at the top of the mounting frame (3).

8. The gear-driven mid-mounted motor according to claim 1, characterized in that: It also includes a rotation adjustment mechanism (5) for driving the mounting frame (3) to rotate to adjust the height of the central axis (4); The rotation adjustment mechanism (5) comprises a support frame (501) fixedly mounted on the vehicle body, an arc-shaped rack (502) rotatably mounted on the support frame (501), and a driving unit for driving the arc-shaped rack (502) to rotate, wherein the axis of the arc-shaped rack (502) coincides with the axis of the output shaft of the motor body (1), and the mounting frame (3) is fixedly mounted on the arc-shaped rack (502).

9. The gear-driven mid-mounted motor according to claim 8, characterized in that: The rotation angle of the mounting frame (3) is ±20°.

10. The gear-driven mid-mounted motor according to claim 9, characterized in that: The driving unit comprises a first gear (503) meshing with the arc-shaped rack (502), a second gear (504) meshing with the first gear (503), and a straight rack (505) meshing with the second gear (504); The first gear (503) and the second gear (504) are both rotatably mounted on the support frame (501), the spur rack (505) is slidably mounted on the support frame (501), a connecting frame (506) is fixedly mounted on the spur rack (505), and the connecting frame (506) is fixedly mounted on the seat lifting rod to automatically adjust the height of the central axis (4) when the seat height is adjusted.

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