WO2022068288A1 - 中置驱动装置和电动辅助自行车 - Google Patents

中置驱动装置和电动辅助自行车 Download PDF

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Publication number
WO2022068288A1
WO2022068288A1 PCT/CN2021/102462 CN2021102462W WO2022068288A1 WO 2022068288 A1 WO2022068288 A1 WO 2022068288A1 CN 2021102462 W CN2021102462 W CN 2021102462W WO 2022068288 A1 WO2022068288 A1 WO 2022068288A1
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WIPO (PCT)
Prior art keywords
plate
side plate
casing
drive device
drive
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PCT/CN2021/102462
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English (en)
French (fr)
Inventor
曾奇方
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广东高标电子科技有限公司
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Publication of WO2022068288A1 publication Critical patent/WO2022068288A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
    • B62M6/40—Rider propelled cycles with auxiliary electric motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M7/00—Motorcycles characterised by position of motor or engine
    • B62M7/02—Motorcycles characterised by position of motor or engine with engine between front and rear wheels
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/108—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction clutches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears

Definitions

  • the present application relates to the technical field of electric bicycles, for example, to a mid-drive device and an electric assisted bicycle.
  • Bicycles are not only widely used at home, but also widely used in public areas.
  • One of the more convenient bicycles is electric assisted bicycles.
  • Electric assisted bicycles are inseparable from a power source (such as battery components). The setting of the power source not only needs to be considered Without affecting the appearance of the bike, reliability and durability issues also need to be considered.
  • a motor drive unit of an electrically assisted bicycle is installed in a bracket provided at the lower part of the frame of the bicycle, the bracket is composed of a top plate and a pair of side plates, and the motor drive unit is inserted and mounted in the middle of the top plate and the side plates.
  • the mounting part fixes the two side plates with bolts and locks the mounting screw holes of the motor drive unit to fix the motor on the frame.
  • the installation size of a pair of side plates has a certain installation gap, generally about 0.5mm to 1mm.
  • the motor drive unit When the motor drive unit is installed on one of the side plates If the motor drive unit is directly locked to the other side plate at the same time, the motor drive unit will be deformed due to relatively large stress, which will seriously affect the performance of the motor drive unit. However, if the bolts on the other side are not locked, the motor drive unit will be at risk of shaking while the bicycle is running. Long-term shaking will cause fatigue damage to the motor drive unit and the frame, posing a safety hazard.
  • the present application provides a mid-drive device and an electric auxiliary bicycle, which can reduce the stress on the drive unit, avoid shaking, and improve stability and reliability.
  • a mid-drive device mounted on a frame of an electric-assisted bicycle, and the mid-drive device includes:
  • an installation bracket comprising a top plate and a first side plate and a second side plate oppositely arranged, the top plate is connected with the vehicle frame, and the top plate, the first side plate and the second side plate are enclosed and formed installation department;
  • a drive unit includes a casing, a driving motor and a central shaft, the casing is inserted into the mounting portion, a first side portion of the casing and the first side plate are connected by bolts, and the driving motor is arranged in the casing, the central shaft is penetrated through the casing, and is drivingly connected with the output shaft of the driving motor; and
  • the elastic metal plate group, the two ends are respectively connected with the second side part of the casing and the second side plate through bolts, the maximum elasticity of the elastic metal plate group in the direction perpendicular to the second side plate
  • the deformation amount is not less than the maximum gap between the second side portion and the second side plate.
  • the first side part is provided with a first installation threaded hole, and the first side part is connected to the first side plate through the first installation threaded hole connection
  • the elastic metal plate group is provided with a second installation threaded hole corresponding to the first installation threaded hole one-to-one, and the elastic metal plate group is connected to the second side through the second installation threaded hole
  • the board is connected, and the first installation threaded hole and the corresponding second installation threaded hole are coaxially arranged.
  • the elastic metal plate group includes a first plate and a second plate, and the first plate and the second plate are both connected with the second side plate and the second plate. the second side connection.
  • the maximum deformation amount of the first plate and the second plate in a direction perpendicular to the second side plate is not less than 2 mm.
  • the thickness of the first plate and the second plate is 1 mm to 5 mm.
  • the elastic metal plate group is made of alloy.
  • the drive unit further includes:
  • the overrunning clutch is arranged in the casing, sleeved on the central shaft, and can be selectively connected to the output end of the driving motor.
  • the drive unit further includes:
  • the transmission gear assembly is arranged in the casing, the input end of which is drivingly connected with the output shaft of the driving motor, and the output end is selectively drivingly connected with the overrunning clutch.
  • the drive unit further includes:
  • the torque sensor is arranged in the casing, and is used for detecting the magnitude of the torque received by the central shaft.
  • an electric-assisted bicycle including the above-mentioned mid-drive device.
  • FIG. 1 is a schematic structural diagram of a mid-drive device provided by the present application.
  • Fig. 2 is the exploded schematic diagram of the middle drive device provided by the present application.
  • FIG. 3 is a schematic structural diagram of a mounting bracket provided by the present application.
  • FIG. 4 is a schematic diagram of the internal structure of the drive unit provided by the present application.
  • FIG. 5 is a schematic structural diagram of the elastic metal plate group provided by the present application.
  • this embodiment provides an electric auxiliary bicycle.
  • the electric auxiliary bicycle includes a middle drive device and a frame, the middle drive device is installed at the bottom of the frame, and the middle drive device includes a mounting bracket
  • the frame 1, the drive unit 2 and the elastic metal plate group 3, the mounting bracket 1 is connected to the frame, and includes a top plate 11 and a first side plate 12 and a second side plate 13 oppositely arranged.
  • the top plate 11, the first side plate 12 and the The second side plate 13 surrounds the mounting portion.
  • the drive unit 2 includes a casing 21 , a driving motor 22 and a central shaft 23 .
  • the casing 21 is inserted into the mounting portion.
  • the first side portion of the casing 21 is connected to the first side plate.
  • the driving motor 22 is arranged in the casing 21, the central shaft 23 is penetrated in the casing 21 in the horizontal direction, and is drivingly connected with the output shaft of the driving motor 22, and the two ends of the elastic metal plate group 3 are respectively connected with the machine.
  • the second side portion of the shell 21 and the second side plate 13 are connected by bolts, and the maximum elastic deformation of the elastic metal plate group 3 in the direction perpendicular to the second side plate 13 is not less than the second side portion and the second side plate 13. the maximum gap between them.
  • the drive unit 2 in the central drive device is connected to the vehicle frame through the mounting bracket 1, wherein the first side part on the casing 21 of the drive unit 2 is directly connected to the first side plate 12 of the mounting bracket 1, and the second The side part is connected with the second side plate 13 through the elastic metal plate group 3, because the elastic metal plate group 3 can elastically deform in the direction perpendicular to the second side plate 13, and the maximum elastic deformation amount is not less than the second side part
  • the gap between the second side plate 13 and the second side plate 13, therefore, within the error range caused by the production and assembly, the elastic metal plate group 3 can be connected with the housing and the mounting bracket 1 at the same time, so as to completely fill the second side and the second side plate 13.
  • the gap between the side plates 13 absorbs the shock transmitted from the frame to the drive unit 2 .
  • the casing 21 is directly connected to the first side plate 12 and the second side plate 13
  • the deformation and stress of the drive unit 2 are reduced.
  • the two side plates 13 adopt a non-locking connection method, which prevents the drive unit 2 from causing fatigue damage to the mounting bracket 1 due to long-term shaking of the drive unit 2, and improves stability and reliability.
  • the first side part is provided with a first installation screw hole 27, the first side part is connected with the first side plate 12 through the first installation screw hole 27, and the elastic metal plate group 3 is provided with a first installation screw hole.
  • the holes 27 are provided in a one-to-one correspondence with the second mounting screw holes 33 , the elastic metal plate group 3 is connected to the second side plate 13 through the second mounting screw holes 33 , the first mounting screw holes 27 and the corresponding second mounting screw holes 33
  • the coaxial arrangement on the one hand, can ensure the force balance between the first side and the second side of the casing 21, and on the other hand, the first side plate 12 and the second side plate 13 of the mounting bracket 1 can be arranged in a symmetrical structure , simplify the design and facilitate the production and processing.
  • the elastic metal plate group 3 includes a first plate 31 and a second plate 32, and both the first plate 31 and the second plate 32 are connected to the second side plate 13 and the second side portion. Since the outer contour of the casing 21 is generally irregular in shape, if the elastic metal plate group 3 is provided as an integrated structure, not only the shape is complex, it is inconvenient for production and processing, but also the versatility is not high.
  • the elastic metal plate group 3 of this embodiment is used by arranging two or more elastic metal plates, the shape is simple, the processing is convenient, and the versatility is greatly improved, and the span of each elastic metal plate is similar to It is smaller than a one-piece structure, so it is also less torsional and durable.
  • the maximum deformation amount of the first plate 31 and the second plate 32 in the direction perpendicular to the second side plate 13 is not less than 2 mm.
  • the thickness of the first plate 31 and the second plate 32 is 1 mm to 5 mm.
  • the elastic metal plate group 3 is made of alloy. In this embodiment, the elastic metal plate group 3 is made of alloy steel and has good elastic deformation performance. In other embodiments of the present application, the elastic metal plate group 3 is made of alloy steel.
  • the plate group 3 can also be made of common alloy materials such as aluminum alloy and magnesium alloy with good mechanical properties.
  • the drive unit 2 further includes an overrunning clutch 24 .
  • the overrunning clutch 24 is arranged in the casing 21 , sleeved on the central shaft 23 , and selectively drive-connected to the output end of the drive motor 22 .
  • the overrunning clutch 24 is a friction type overrunning clutch such as a roller clutch and a braced clutch, which has the advantages of smooth engagement and low noise.
  • the drive unit 2 further includes a transmission gear assembly 26, the transmission gear assembly 26 is arranged in the casing 21, the input end of the transmission gear assembly 26 is connected to the output shaft of the drive motor 22, and the output end can be selectively connected to the overrunning clutch 24.
  • the inner ring of the overrunning clutch 24 is fixedly connected with the central shaft 23
  • the outer ring of the overrunning clutch 24 is fixedly connected with an output gear
  • the output gear is drivingly connected with the output end of the transmission gear assembly 26
  • the inner ring and the outer ring of the overrunning clutch 24 are selectable.
  • transmission connection In one embodiment, helical gears are used in the transmission gear assembly 26 as the transmission member, which has the characteristics of smooth transmission and less impact, vibration and noise, and is especially suitable for the high-speed transmission scene in this embodiment.
  • the drive unit 2 further includes a torque sensor 25 .
  • the torque sensor 25 is arranged in the casing 21 and is used to detect the magnitude of the torque received by the central shaft 23 to prevent the central shaft 23 from being damaged due to overloading.
  • the torque sensor 25 is a non-contact torque sensor such as a magneto-electric torque sensor, which has the advantages of long life, high reliability, low loss, short delay, and less influence by shaft deflection and axial offset. advantage.
  • the drive unit in the mid-drive device provided by the present application is connected to the vehicle frame through a mounting bracket, wherein the first side part on the casing of the drive unit is directly connected to the first side plate of the mounting bracket, and the second side part is directly connected to the first side plate of the mounting bracket. Then the elastic metal plate group is connected to the second side plate, because the elastic metal plate group can elastically deform in the direction perpendicular to the second side plate, and the maximum elastic deformation amount is not less than the distance between the second side portion and the second side plate.
  • the elastic metal plate group can be connected with the housing and the mounting bracket at the same time, so as to completely fill the gap between the second side and the second side plate, and absorb Vibration transmitted from the frame to the drive unit.
  • the deformation and stress of the drive unit are reduced.
  • the The locking connection method avoids the fatigue damage of the drive unit and the mounting bracket caused by the long-term shaking of the drive unit, and improves the stability and reliability.

Abstract

提供了一种中置驱动装置和包括其的电动辅助自行车。中置驱动装置包括：安装托架（1），其包括顶板（11）以及相对设置的第一侧板（12）和第二侧板（13），顶板与车架连接，顶板、第一侧板和第二侧板围蔽形成安装部；驱动单元（2），其包括机壳（21）、驱动电机（22）和中轴（23），机壳插设于安装部中，机壳的第一侧部与第一侧板通过螺栓连接，驱动电机设于机壳中，中轴穿设于机壳，与驱动电机的输出轴传动连接；以及弹性金属板组（3），其两端分别与机壳的第二侧部和第二侧板通过螺栓连接，弹性金属板组在垂直于第二侧板的方向上的最大弹性变形量不小于第二侧部与第二侧板之间的最大间隙。这种结构避免了驱动单元因长期晃动造成驱动单元和安装托架产生疲劳破坏的问题。

Description

中置驱动装置和电动辅助自行车
本申请要求在2020年09月30日提交中国专利局、申请号为202011066210.2的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及电动自行车技术领域，例如，涉及一种中置驱动装置和电动辅助自行车。
背景技术
自行车不仅家用使用较多，在公共领域也使用非常广泛，自行车中较为便捷的一种是电动辅助自行车，电动辅助自行车离不开动力源(例如电池组件)，对于动力源的设置不仅需要考虑到不影响自行车外观，还需要考虑到可靠性和耐用性问题。
在相关技术中，电动辅助自行车的马达驱动单元安装于设置在自行车的车架下部的托架中，托架由顶板和一对侧板构成，马达驱动单元插入安装于顶板和侧板构成的中间安装部，由螺栓将两侧板固定并锁紧马达驱动单元安装螺丝孔，从而将马达固定于车架上。然而由于生产工艺水平(焊接+反复的热处理)问题，一对侧板的安装尺寸都加留有一定的安装间隙，一般为0.5mm到1mm左右，当马达驱动单元在安装在其中一个侧板上时，另一侧就会存在间隙，若直接采用将马达驱动单元同时锁紧于另一侧板，马达驱动单元就会受到比较大的应力从而变形，从而严重影响了马达驱动单元的性能。而如果另一侧螺栓不锁紧，在自行车的行驶中，马达驱动单元就会有晃动的风险，长期晃动会对马达驱动单元和车架产生疲劳破坏，存在安全隐患。
因此，亟需一种中置驱动装置和电动辅助自行车，以解决上述的技术问题。
发明内容
本申请提供一种中置驱动装置和电动辅助自行车，能够降低驱动单元所受的应力大小，同时避免晃动，提高稳定性和可靠性。
本申请采用以下技术方案：
第一方面，提供一种中置驱动装置，安装于电动辅助自行车的车架上，所述中置驱动装置包括：
安装托架，包括顶板以及相对设置的第一侧板和第二侧板，所述顶板与所 述车架连接，所述顶板、所述第一侧板和所述第二侧板围蔽形成安装部；
驱动单元，包括机壳、驱动电机和中轴，所述机壳插设于所述安装部中，所述机壳的第一侧部与所述第一侧板通过螺栓连接，所述驱动电机设于所述机壳中，所述中轴穿设于所述机壳，且与所述驱动电机的输出轴传动连接；以及
弹性金属板组，两端分别与所述机壳的第二侧部和所述第二侧板通过螺栓连接，所述弹性金属板组在垂直于所述第二侧板的方向上的最大弹性变形量不小于所述第二侧部与所述第二侧板之间的最大间隙。
作为中置驱动装置的一种可选的技术方案，所述第一侧部上设有第一安装螺纹孔，所述第一侧部通过所述第一安装螺纹孔与所述第一侧板连接，所述弹性金属板组上设有与所述第一安装螺纹孔一一对应设置的第二安装螺纹孔，所述弹性金属板组通过所述第二安装螺纹孔与所述第二侧板连接，所述第一安装螺纹孔和与其对应的所述第二安装螺纹孔同轴设置。
作为中置驱动装置的一种可选的技术方案，所述弹性金属板组包括第一板和第二板，所述第一板和所述第二板均与所述第二侧板和所述第二侧部连接。
作为中置驱动装置的一种可选的技术方案，所述第一板和所述第二板在垂直于所述第二侧板的方向上的最大变形量不小于2毫米。
作为中置驱动装置的一种可选的技术方案，所述第一板和所述第二板的厚度为1毫米到5毫米。
作为中置驱动装置的一种可选的技术方案，所述弹性金属板组采用合金制成。
作为中置驱动装置的一种可选的技术方案，所述驱动单元还包括：
超越离合器，设于所述机壳中，套设于所述中轴上，可选择性的与所述驱动电机的输出端传动连接。
作为中置驱动装置的一种可选的技术方案，所述驱动单元还包括：
传动齿轮组件，设于所述机壳中，其输入端与所述驱动电机的输出轴传动连接，输出端可选择性的与所述超越离合器传动连接。
作为中置驱动装置的一种可选的技术方案，所述驱动单元还包括：
扭矩传感器，设于所述机壳中，用于检测所述中轴所受的扭矩大小。
第二方面，提供一种电动辅助自行车，包括如上所述的中置驱动装置。
附图说明
图1是本申请提供的中置驱动装置的结构示意图；
图2是本申请提供的中置驱动装置的分解示意图；
图3是本申请提供的安装托架的结构示意图；
图4是本申请提供的驱动单元的内部结构示意图；
图5是本申请提供的弹性金属板组的结构示意图。
图中：
1、安装托架；11、顶板；12、第一侧板；13、第二侧板；2、驱动单元；21、机壳；22、驱动电机；23、中轴；24、超越离合器；25、扭矩传感器；26、传动齿轮组件；27、第一安装螺纹孔；3、弹性金属板组；31、第一板；32、第二板；33、第二安装螺纹孔。
具体实施方式
如图1-图5所示，本实施例提供一种电动辅助自行车，电动辅助自行车包括了中置驱动装置和车架，中置驱动装置安装于车架的底部，中置驱动装置包括安装托架1、驱动单元2和弹性金属板组3，安装托架1与车架连接，包括顶板11以及相对设置的第一侧板12和第二侧板13，顶板11、第一侧板12和第二侧板13围蔽形成安装部，驱动单元2包括机壳21、驱动电机22和中轴23，机壳21插设于安装部中，机壳21的第一侧部与第一侧板12通过螺栓连接，驱动电机22设于机壳21中，中轴23沿水平方向穿设于机壳21，且与驱动电机22的输出轴传动连接，弹性金属板组3的两端分别与机壳21的第二侧部和第二侧板13通过螺栓连接，弹性金属板组3在垂直于第二侧板13的方向上的最大弹性变形量不小于第二侧部与第二侧板13之间的最大间隙。
中置驱动装置中的驱动单元2通过安装托架1与车架连接，其中驱动单元2的机壳21上的第一侧部与安装托架1的第一侧板12直接连接，而第二侧部则通过弹性金属板组3与第二侧板13连接，由于弹性金属板组3能够在垂直于第二侧板13的方向上发生弹性形变，且最大弹性变形量不小于第二侧部与第二侧板13之间的间隙，因此在生产组装所造成的误差范围内，弹性金属板组3均能够同时与壳体和安装托架1连接，以完全填补第二侧部与第二侧板13之间的间隙，并吸收从车架向驱动单元2传递的震动。一方面，相比机壳21与第一侧板12和第二侧板13均直接连接的方式，降低了驱动单元2所承受的变形和应力作用，另一方面，相比机壳21与第二侧板13采用不锁紧的连接方式，避免了驱动单元2因长期晃动，造成驱动单元2和安装托架1产生疲劳破坏，提高稳定 性和可靠性。
可选的，第一侧部上设有第一安装螺纹孔27，第一侧部通过第一安装螺纹孔27与第一侧板12连接，弹性金属板组3上设有与第一安装螺纹孔27一一对应设置的第二安装螺纹孔33，弹性金属板组3通过第二安装螺纹孔33与第二侧板13连接，第一安装螺纹孔27和与其对应的第二安装螺纹孔33同轴设置，一方面能够保证机壳21的第一侧部和第二侧部受力平衡，另一方面使得安装托架1的第一侧板12和第二侧板13能够呈对称结构设置，简化设计，便于生产加工。
可选的，弹性金属板组3包括第一板31和第二板32，第一板31和第二板32均与第二侧板13和第二侧部连接。由于机壳21的外轮廓一般为不规则形状，若将弹性金属板组3设置为一体式的结构，不仅形状复杂，不便于生产加工，而且通用性不高，对于外轮廓不同的机壳21需要重新设计，而本实施例的弹性金属板组3通过设置两个或两个以上的弹性金属板配合使用，形状简单，加工方便，通用性也大大提高，而且每个弹性金属板的跨度相比一体式的结构更小，因此其所受的扭转作用力也更小，耐用性得到保证。
在本实施例中，第一板31和第二板32在垂直于第二侧板13的方向上的最大变形量不小于2毫米。
可选的，第一板31和第二板32的厚度为1毫米到5毫米。
一实施例中，弹性金属板组3采用合金制成，在本实施例中，弹性金属板组3由合金钢制成，具有良好的弹性变形性能，在本申请的其它实施例中，弹性金属板组3也可以由具备良好力学性能的铝合金、镁合金等常见的合金材质制成。
可选的，驱动单元2还包括超越离合器24，超越离合器24设于机壳21中，套设于中轴23上，可选择性的与驱动电机22的输出端传动连接。一实施例中，超越离合器24选用滚柱离合器、斜撑离合器等摩擦式超越离合器，其具备接合平稳、噪声较小等优点。
可选的，驱动单元2还包括传动齿轮组件26，传动齿轮组件26设于机壳21中，其输入端与驱动电机22的输出轴传动连接，输出端可选择性的与超越离合器24传动连接。超越离合器24的内环与中轴23固定连接，超越离合器24的外环固定连接有输出齿轮，输出齿轮与传动齿轮组件26的输出端传动连接，超越离合器24的内环与外环可选择性的传动连接。一实施例中，传动齿轮组件26中均采用斜齿轮作为传动件，具有传动平稳以及冲击、振动和噪声较小的特点，尤其适用于本实施例中的高速传动场景。
可选的，驱动单元2还包括扭矩传感器25，扭矩传感器25设于机壳21中， 用于检测中轴23所受的扭矩大小，避免中轴23过载而损坏。一实施例中，扭矩传感器25选用磁电式扭矩传感器等非接触式扭矩传感器，具有寿命长、可靠性高、损耗低、延时短、受轴的偏转和轴向偏移的影响更小的优点。
本申请提供的中置驱动装置中的驱动单元通过安装托架与车架连接，其中驱动单元的机壳上的第一侧部与安装托架的第一侧板直接连接，而第二侧部则通过弹性金属板组与第二侧板连接，由于弹性金属板组能够在垂直于第二侧板的方向上发生弹性形变，且最大弹性变形量不小于第二侧部与第二侧板之间的间隙，因此在生产组装所造成的误差范围内，弹性金属板组均能够同时与壳体和安装托架连接，以完全填补第二侧部与第二侧板之间的间隙，并吸收从车架向驱动单元传递的震动。一方面，相比机壳与第一侧板和第二侧板均直接连接的方式，降低了驱动单元所承受的变形和应力作用，另一方面，相比机壳与第二侧板采用不锁紧的连接方式，避免了驱动单元因长期晃动，造成驱动单元和安装托架产生疲劳破坏，提高稳定性和可靠性。

Claims (10)

  1. 一种中置驱动装置，安装于电动辅助自行车的车架上，包括：
    安装托架(1)，包括顶板(11)以及相对设置的第一侧板(12)和第二侧板(13)，所述顶板(11)与所述车架连接，所述顶板(11)、所述第一侧板(12)和所述第二侧板(13)围蔽形成安装部；
    驱动单元(2)，包括机壳(21)、驱动电机(22)和中轴(23)，所述机壳(21)插设于所述安装部中，所述机壳(21)的第一侧部与所述第一侧板(12)通过螺栓连接，所述驱动电机(22)设于所述机壳(21)中，所述中轴(23)穿设于所述机壳(21)，且与所述驱动电机(22)的输出轴传动连接；以及
    弹性金属板组(3)，两端分别与所述机壳(21)的第二侧部和所述第二侧板(13)通过螺栓连接，所述弹性金属板组(3)在垂直于所述第二侧板(13)的方向上的最大弹性变形量大于或等于所述第二侧部与所述第二侧板(13)之间的最大间隙。
  2. 根据权利要求1所述的中置驱动装置，其中，所述第一侧部上设有至少一个第一安装螺纹孔(27)，所述第一侧部通过所述至少一个第一安装螺纹孔(27)与所述第一侧板(12)连接，所述弹性金属板组(3)上设有与所述至少一个第一安装螺纹孔(27)一一对应设置的至少一个第二安装螺纹孔(33)，所述弹性金属板组(3)通过所述至少一个第二安装螺纹孔(33)与所述第二侧板(13)连接，每个所述第一安装螺纹孔(27)和与其对应的所述第二安装螺纹孔(33)同轴设置。
  3. 根据权利要求1所述的中置驱动装置，其中，所述弹性金属板组(3)包括第一板(31)和第二板(32)，所述第一板(31)和所述第二板(32)均与所述第二侧板(13)和所述第二侧部连接。
  4. 根据权利要求3所述的中置驱动装置，其中，所述第一板(31)和所述第二板(32)在垂直于所述第二侧板(13)的方向上的最大变形量大于或等于2毫米。
  5. 根据权利要求3所述的中置驱动装置，其中，所述第一板(31)和所述第二板(32)的厚度为1毫米到5毫米。
  6. 根据权利要求1所述的中置驱动装置，其中，所述弹性金属板组(3)采用合金制成。
  7. 根据权利要求1-6任一项所述的中置驱动装置，其中，所述驱动单元(2)还包括：
    超越离合器(24)，设于所述机壳(21)中，套设于所述中轴(23)上， 可选择性的与所述驱动电机(22)的输出端传动连接。
  8. 根据权利要求7所述的中置驱动装置，其中，所述驱动单元(2)还包括：
    传动齿轮组件(26)，设于所述机壳(21)中，所述传动齿轮组件(26)的输入端与所述驱动电机(22)的输出轴传动连接，所述传动齿轮组件(26)的输出端可选择性的与所述超越离合器(24)传动连接。
  9. 根据权利要求1-6任一项所述的中置驱动装置，其中，所述驱动单元(2)还包括：
    扭矩传感器(25)，设于所述机壳(21)中，用于检测所述中轴(23)所受的扭矩大小。
  10. 一种电动辅助自行车，包括权利要求1-9任一项所述中置驱动装置。
PCT/CN2021/102462 2020-09-30 2021-06-25 中置驱动装置和电动辅助自行车 WO2022068288A1 (zh)

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