Mid-position motor system and moped

Abstract

The utility model discloses a kind of middle motor system and moped, middle motor system includes middle shaft subassembly, inner rotor motor subassembly and clutch assembly, the inner rotor motor subassembly and the clutch assembly coaxial sleeve on the middle shaft subassembly, the clutch assembly includes electric clutch, human power clutch and clutch shell, the electric clutch is set in the clutch shell outer and drives the clutch shell rotation, the human power clutch is set in the clutch shell inner and drives the clutch shell rotation, the inner rotor motor subassembly drives the electric clutch rotation, the middle shaft subassembly drives the human power clutch rotation. The utility model's middle motor system is small and compact, light in weight, clutch assembly can withstand greater torque, and clutch efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of electric bicycle technology, specifically to a mid-mounted motor system and an electric bicycle. Background Technology

[0002] Existing electric-assist bicycles typically use external rotor motors as their mid-drive motors. External rotors occupy a large space, resulting in a bulky and heavy bicycle that is cumbersome and uncomfortable to ride. Furthermore, the mid-drive motor of existing electric-assist bicycles contains a clutch, which generally includes a manual clutch, an electric clutch, and a clutch housing. However, in current models, both the manual and electric clutches are housed within the clutch housing. This results in a small contact area between the manual or electric clutch and the clutch housing's engagement / disengagement surface, leading to low torque capacity and low clutch efficiency. Utility Model Content

[0003] To address at least one of the problems mentioned in the background art, this utility model provides a mid-mounted motor system and a power-assisted bicycle, wherein the mid-mounted motor system is compact, lightweight, and the clutch assembly can withstand greater torque and has high clutch efficiency.

[0004] The specific technical solution provided by this utility model is as follows:

[0005] In a first aspect, a mid-mounted motor system is provided, including a central shaft assembly, an inner rotor motor assembly, and a clutch assembly. The inner rotor motor assembly and the clutch assembly are coaxially mounted on the central shaft assembly. The clutch assembly includes an electric clutch, a manual clutch, and a clutch housing. The electric clutch is disposed outside the clutch housing and drives the clutch housing to rotate. The manual clutch is disposed inside the clutch housing and drives the clutch housing to rotate. The inner rotor motor assembly drives the electric clutch to rotate, and the central shaft assembly drives the manual clutch to rotate.

[0006] As a preferred embodiment of the above solution, the mid-mounted motor system further includes a torque sensor. The central shaft assembly includes a central shaft, a hollow sleeve, and a bushing. The torque sensor, the hollow sleeve, and the bushing are all fitted onto the central shaft and rotate together with the central shaft. The manual clutch is fitted onto the bushing.

[0007] As a preferred embodiment of the above solution, the outer wall of the clutch housing is provided with a step, the electric clutch abuts against the step, the electric clutch is engaged and disengaged with the clutch housing, the manual clutch is fixed on the inner wall of the clutch housing, and the manual clutch is engaged and disengaged with the bushing.

[0008] As a preferred embodiment of the above scheme, the mid-mounted motor system further includes a planetary gear transmission assembly, which is sleeved on the central shaft assembly. The planetary gear transmission assembly includes an internal gear ring, a first-stage planetary gear mechanism, and a second-stage planetary gear mechanism. Both the first-stage and second-stage planetary gear mechanisms mesh with the internal gear ring. The internal rotor motor assembly drives the first-stage planetary gear mechanism to rotate, which in turn drives the second-stage planetary gear mechanism to rotate, and the second-stage planetary gear mechanism drives the electric clutch to rotate.

[0009] As a preferred embodiment of the above scheme, the primary planetary gear mechanism includes a primary sun gear, primary planetary gears, and a primary planetary carrier. The primary sun gear is connected to the internal rotor motor assembly and meshes with the primary planetary gears. The primary planetary gears are connected to the primary planetary carrier, which is approximately triangular in shape. The secondary planetary gear mechanism includes a secondary sun gear, secondary planetary gears, and a secondary planetary carrier. The secondary sun gear is connected to the primary planetary carrier and meshes with the secondary planetary gears. The secondary planetary gears are connected to the secondary planetary carrier, which is fixedly sleeved outside the electric clutch. Both the primary and secondary planetary gears mesh with the internal gear ring.

[0010] As a preferred embodiment of the above scheme, the inner rotor motor assembly includes an inner rotor and a stator. The inner rotor is connected to the first-stage sun gear via a key and drives the first-stage sun gear to rotate. The stator is sleeved outside the inner rotor.

[0011] As a preferred embodiment of the above scheme, the mid-mounted motor system further includes a housing assembly, which includes a housing, a left end cover, a right end cover, and a hanger. The housing is fitted over the stator and the planetary gear assembly. The stator and the gear ring are fixed to the housing. The left end cover and the right end cover are fixed to the left and right ends of the housing. The hanger is fixedly fitted over the housing.

[0012] As a preferred embodiment of the above solution, the housing assembly further includes a cable outlet, the housing and the hanger are provided with a mounting groove, the cable outlet is fixed on the mounting groove, and the cable outlet is provided with a coil, the coil being connected to the stator.

[0013] As a preferred embodiment of the above scheme, at least one of the electric clutch and the manual clutch is a needle roller clutch.

[0014] By employing the above technical solutions, this utility model makes the mid-mounted motor system more compact and lightweight by setting an internal rotor motor assembly. By setting a clutch assembly with the electric clutch outside the clutch housing and the manual clutch inside the clutch housing, the contact area between the electric and manual one-way clutches and the clutch housing can be increased, the working surface of the clutch can be increased, thereby being able to withstand greater torque and improving clutch efficiency.

[0015] Secondly, a power-assisted bicycle is provided, including the mid-mounted motor system described above. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 for Figure 1 A structural schematic diagram of the outer casing components is shown below.

[0019] Figure 3 This is a schematic diagram of the structure between the central shaft assembly and the clutch assembly of this utility model;

[0020] Figure 4 This is a schematic diagram of the planetary gearbox assembly of this utility model. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this 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 this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," "upper," "lower," "inner," "outer," and "bottom," etc., used in this specification to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention 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, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] The following content is for reference only. Figures 1 to 4 .

[0024] Example 1

[0025] This utility model provides a mid-mounted motor system, including a central shaft assembly 1, an inner rotor motor assembly 2, and a clutch assembly 3. The inner rotor motor assembly 2 and the clutch assembly 3 are coaxially mounted on the central shaft assembly 1. The clutch assembly 3 includes an electric clutch 31, a manual clutch 32, and a clutch housing 33. The electric clutch 31 is disposed outside the clutch housing 33 and drives the clutch housing 33 to rotate. The manual clutch 32 is disposed inside the clutch housing 33 and drives the clutch housing 33 to rotate. The inner rotor motor assembly 2 drives the electric clutch 31 to rotate, and the central shaft assembly 1 drives the manual clutch 32 to rotate.

[0026] The mid-mounted motor system also includes a torque sensor 4. The central shaft assembly 1 includes a central shaft 11, a hollow sleeve 12, and a bushing 13. The torque sensor 4, the hollow sleeve 12, and the bushing 13 are all sleeved on the central shaft 11 and rotate together with the central shaft 11. The manual clutch 32 is sleeved on the bushing 13. In this embodiment, the two ends of the central shaft 11 are square, and cranks (not shown) are connected to the two ends of the central shaft 11. By stepping on the cranks, the central shaft 11 is rotated, realizing the output of human power. The torque sensor 4 is a strain gauge torque sensor. The torque sensor 4 includes a strain gauge (not shown), an elastic body 41, and a frame 42 connected together. The strain gauge and the elastic body 41 are set on the frame 42. The elastic body 41 and the hollow sleeve 12 are both provided with an internal spline (not shown) at one end and an external spline (not shown) at the other end. The internal spline of the elastic body 41 is connected to the spline of the central shaft 11, and the external spline of the elastic body 41 is connected to the internal spline of the hollow sleeve 12. The external spline of the hollow sleeve 12 is connected to the spline of the bushing 13. When the central shaft 11 rotates, it drives the elastic body 41 to rotate. The elastic body 41 deforms and generates corresponding strain, which is then transmitted to the strain gauge connected to it, causing a change in the resistance value of the energized strain gauge. The measurement circuit converts this change in resistance value into an electrical output. The magnitude of the output electrical quantity reflects the magnitude of the torque of the central shaft 11.

[0027] The outer wall of the clutch housing 33 is provided with a step 331. The electric clutch 31 abuts against the step 331 and is engaged with the clutch housing 33. The manual clutch 32 is fixed to the inner wall of the clutch housing 33 and is engaged with the bushing 13. At least one of the electric clutch 31 and the manual clutch 32 is a needle roller clutch. In this embodiment, both the electric clutch 31 and the manual clutch 32 are needle roller clutches. The needle roller clutch allows the electric clutch 31 and the manual clutch 32 to have a faster response speed, faster locking during engagement, and improved clutch sensitivity.

[0028] The mid-mounted motor system also includes a planetary gear transmission assembly 5, which is mounted on the central shaft assembly 1. The planetary gear transmission assembly 5 includes an internal gear ring 51, a first-stage planetary gear mechanism 52, and a second-stage planetary gear mechanism 53. Both the first-stage planetary gear mechanism 52 and the second-stage planetary gear mechanism 53 mesh with the internal gear ring 51. The internal rotor motor assembly 2 drives the first-stage planetary gear mechanism 52 to rotate, the first-stage planetary gear mechanism 52 drives the second-stage planetary gear mechanism 53 to rotate, and the second-stage planetary gear mechanism 53 drives the electric clutch 31 to rotate. The primary planetary gear mechanism 52 includes a primary sun gear 521, primary planetary gears 522, and a primary planetary carrier 523. The primary sun gear 521 is connected to the inner rotor motor assembly 2, and the primary sun gear 521 meshes with the primary planetary gears 522. The primary planetary gears 522 are connected to the primary planetary carrier 523. The primary planetary carrier 523 is approximately triangular in shape, which reduces its size and the weight of the mid-mounted motor system. The secondary planetary gear mechanism 53 includes a secondary sun gear 531, secondary planetary gears 532, and a secondary planetary carrier 533. The secondary sun gear 531 is connected to the primary planetary carrier 523, and the secondary sun gear 531 meshes with the secondary planetary gears 532. The secondary planetary gears 532 are connected to the secondary planetary carrier 533. The secondary planetary carrier 533 is fixedly sleeved outside the electric clutch 31. Both the primary planetary gears 522 and the secondary planetary gears 532 mesh with the internal gear ring 51. The inner rotor motor assembly 2 includes an inner rotor 21 and a stator 22. The inner rotor 21 is connected to the first-stage sun gear 521 via a key 54 and drives the first-stage sun gear 521 to rotate. The stator 22 is sleeved on the inner rotor 21. In this embodiment, the inner rotor 21 is provided with a motor magnet 23, and the planetary gear transmission assembly 5 is sleeved on the hollow sleeve 12. When electrically driven, the stator 22 coil is energized, and the stator 22 drives the inner rotor 21 to rotate. The inner rotor 21 drives the first-stage sun gear 521 to rotate, the first-stage sun gear 521 drives the first-stage planetary gear 522 to rotate, the first-stage planetary gear 522 drives the first-stage planetary carrier 523 to rotate, the first-stage planetary carrier 523 drives the second-stage sun gear 531 to rotate, the second-stage sun gear 531 drives the second-stage planetary gear 532 to rotate, the second-stage planetary gear 532 drives the second-stage planetary carrier 533 to rotate, the second-stage planetary carrier 533 drives the electric clutch 31 to rotate, and the electric clutch 31 drives the clutch housing 33 to rotate, outputting power through the clutch housing 33.

[0029] The mid-drive motor system also includes a housing assembly 6, which includes a housing 61, a left end cover 62, a right end cover 63, and a hanger 64. The housing 61 is fitted over the stator 22 and the planetary gear assembly 5. The stator 22 and the gear ring 51 are fixed to the housing 61. The left end cover 62 and the right end cover 63 are fixed to the left and right ends of the housing 61. The hanger 64 is fixedly fitted over the housing 61 and welded to the frame of the electric bicycle. In this embodiment, the mid-mounted motor system also includes a control board 7, which is connected to the stator 22 and the torque sensor 4. The frame 42 of the control board 7 and the torque sensor 4 is fixed on the left end cover 62, which is located on one side of the first-stage sun gear 521. A gear plate bracket 8 is provided on one side of the right end cover 63. The gear plate bracket 8 is splinedly connected to the clutch housing 33. A locking cover 9 is provided on one side of the gear plate bracket 8, which is sleeved on the central shaft 11. The clutch housing 33 drives the gear plate bracket 8 to rotate. The gear plate bracket 8 has multiple gear plates (not shown), which are connected to a chain to form a power output load. The housing assembly 6 also includes a cable outlet 65. The housing 61 and the hanger 64 have mounting slots 66. The cable outlet 65 is fixed on the mounting slots 66. The cable outlet 65 has a coil (not shown), which is connected to the strain gauge of the stator 22 and the torque sensor 4.

[0030] In addition, the mid-mounted motor system of this utility model is provided with sealing rings (not shown) at corresponding positions of each component to ensure sealing; bearings (not shown) and shaft retaining rings (not shown) are provided at corresponding rotation positions to ensure reliable rotation.

[0031] The mid-mounted motor system of this utility model can realize three riding modes. In pure electric drive mode, the inner rotor motor assembly 2 drives the electric clutch 31 to rotate through the planetary gear assembly 5. The electric clutch 31 drives the clutch housing 33 to rotate, and outputs electric power through the clutch housing 33. At this time, the coil of the torque sensor 4 is not energized, the torque sensor 4 does not work, the manual clutch 32 rotates freely relative to the bushing 13, and the central shaft assembly 1 does not rotate. In pure manual drive mode, the central shaft 11 is driven to rotate by manual drive. The central shaft 11 drives the hollow sleeve 12 and the bushing 13 to rotate. The bushing 13 drives the manual clutch 32 to rotate. The manual clutch 32 drives the clutch housing 33 to rotate, and outputs manual power through the clutch housing 33. At this time, the inner rotor motor assembly 2 and the planetary gear assembly 5 do not work, the electric clutch 31 does not rotate, and the clutch housing 33 rotates freely relative to the electric clutch 31. In hybrid electric drive mode, the central shaft 11 is rotated by human power, which in turn drives the torque sensor 4. The torque sensor 4 drives the hollow sleeve 12 and the bushing 13 to rotate, which in turn drives the human-powered clutch 32 to rotate. The human-powered clutch 32 drives the clutch housing 33 to rotate, and the clutch housing 33 outputs human power. At the same time, the coil of the torque sensor 4 is energized, and the torque sensor 4 collects the torque signal of the central shaft and transmits it to the control board 7. The control board 7 controls the stator 22 to present different operating states according to different riding environment conditions (climbing, riding against the wind, etc.). The stator 22 drives the inner rotor 21, the planetary gear assembly 5, and the electric clutch 31 to present different operating states, thereby driving the clutch housing 33 to rotate to realize electric power output to assist human power output. Human power and electric power jointly drive the bicycle body, realizing flexible, easy, and comfortable riding.

[0032] This invention makes the mid-mounted motor system more compact and lightweight by setting an inner rotor motor assembly 2. By setting the clutch assembly 3 with the electric clutch 31 outside the clutch housing 33 and the manual clutch 32 inside the clutch housing 33, the contact area between the electric one-way valve 31 and the manual one-way valve 32 and the clutch housing 33 can be increased, the working surface of the clutch is increased, thereby it can withstand greater torque and improve the clutch efficiency.

[0033] Example 2

[0034] This utility model provides a power-assisted bicycle, including a mid-mounted motor system as described in Embodiment 1.

[0035] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0036] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A mid-mounted motor system, characterized in that, The device includes a central shaft assembly, an inner rotor motor assembly, and a clutch assembly. The inner rotor motor assembly and the clutch assembly are coaxially mounted on the central shaft assembly. The clutch assembly includes an electric clutch, a manual clutch, and a clutch housing. The electric clutch is disposed outside the clutch housing and drives the clutch housing to rotate. The manual clutch is disposed inside the clutch housing and drives the clutch housing to rotate. The inner rotor motor assembly drives the electric clutch to rotate, and the central shaft assembly drives the manual clutch to rotate.

2. The mid-mounted motor system according to claim 1, characterized in that, It also includes a torque sensor. The central shaft assembly includes a central shaft, a hollow sleeve, and a bushing. The torque sensor, the hollow sleeve, and the bushing are all sleeved on the central shaft and rotate together with the central shaft. The manual clutch is sleeved on the bushing.

3. The mid-mounted motor system according to claim 2, characterized in that, The outer wall of the clutch housing is provided with a step, the electric clutch abuts against the step, the electric clutch is engaged and disengaged with the clutch housing, the manual clutch is fixed on the inner wall of the clutch housing, and the manual clutch is engaged and disengaged with the bushing.

4. The mid-mounted motor system according to claim 1, characterized in that, It also includes a planetary gear transmission assembly, which is sleeved on the central shaft assembly. The planetary gear transmission assembly includes an internal gear ring, a first-stage planetary gear mechanism, and a second-stage planetary gear mechanism. Both the first-stage and second-stage planetary gear mechanisms mesh with the internal gear ring. The internal rotor motor assembly drives the first-stage planetary gear mechanism to rotate, the first-stage planetary gear mechanism drives the second-stage planetary gear mechanism to rotate, and the second-stage planetary gear mechanism drives the electric clutch to rotate.

5. The mid-mounted motor system according to claim 4, characterized in that, The primary planetary gear mechanism includes a primary sun gear, primary planetary gears, and a primary planetary carrier. The primary sun gear is connected to the internal rotor motor assembly and meshes with the primary planetary gears. The primary planetary gears are connected to the primary planetary carrier, which is approximately triangular in shape. The secondary planetary gear mechanism includes a secondary sun gear, secondary planetary gears, and a secondary planetary carrier. The secondary sun gear is connected to the primary planetary carrier and meshes with the secondary planetary gears. The secondary planetary gears are connected to the secondary planetary carrier, which is fixedly mounted outside the electric clutch. Both the primary and secondary planetary gears mesh with the internal gear ring.

6. The mid-mounted motor system according to claim 5, characterized in that, The inner rotor motor assembly includes an inner rotor and a stator. The inner rotor is connected to the first-stage sun gear via a key and drives the first-stage sun gear to rotate. The stator is sleeved outside the inner rotor.

7. The mid-mounted motor system according to claim 6, characterized in that, It also includes a housing assembly, which includes a housing, a left end cover, a right end cover, and a hanger. The housing is fitted over the stator and the planetary gear assembly. The stator and the gear ring are fixed to the housing. The left end cover and the right end cover are fixed to the left and right ends of the housing. The hanger is fixedly fitted over the housing.

8. The mid-mounted motor system according to claim 7, characterized in that, The housing assembly also includes a cable outlet. The housing and the hanger are provided with a mounting groove. The cable outlet is fixed in the mounting groove and has a coil connected to the stator.

9. The mid-mounted motor system according to claim 1, characterized in that, At least one of the electric clutch and the manual clutch is a needle roller clutch.

10. A power-assisted bicycle, characterized in that, Including the mid-drive motor system as described in any one of claims 1-9.

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