Zero-reluctance centrally-mounted motor

Abstract

The utility model innovatively provides a zero reluctance centrally-mounted motor, which comprises a casing, and a torque center shaft, a transmission gear set and a motor which are positioned in the casing, the torque center shaft is connected with the motor through the transmission gear set, the transmission gear set comprises a transmission shaft, and a one-way bearing is arranged between the transmission shaft and a motor rotor; the electric bicycle has the advantages that when a rider steps on the bicycle at a high speed, the pedals are completely separated from the motor, and the controller and the battery can be protected.

Description

Technical Field

[0001] The utility model relates to the technical field of center-mounted motors, and more specifically to a center-mounted motor with zero magnetic resistance. Background Art

[0002] As the pressure of urban traffic continues to increase, more and more people choose green and convenient ways of travel such as riding bicycles or electric motorcycles, and electric bicycles have become the first choice for users. Electric bicycles need to add a power drive system to traditional bicycles to achieve it. The power drive system chooses an electric motor drive system, and when applied to bicycles, it will use a hub motor assembly or a mid-mounted motor assembly.

[0003] For mid-to-high-end electric-assisted bicycles, mid-mounted motor assemblies are more likely to be used. The mid-mounted motor assembly is an independent electric drive system that integrates the motor, reduction gear, controller, sensor and other components. It is directly arranged at the pedaling position of the bicycle, and the rear wheel speed change system can continue to be configured, giving the vehicle a larger and more flexible usage scenario. However, the output ends of the current mid-mounted motors are directly connected coaxially with the drive shaft. When the rider pedals hard, the motor is easily reversely charged, and certain losses are caused to the motor, battery and controller. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a mid-mounted motor with zero magnetic resistance to overcome the above-mentioned defects in the prior art.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A zero magnetic resistance mid-mounted motor comprises a casing, a torque center shaft located in the casing, a transmission gear set and a motor, wherein the torque center shaft is connected to the motor via the transmission gear set, the transmission gear set comprises a transmission shaft, and a one-way bearing is provided between the transmission shaft and the motor rotor.

[0007] Furthermore, the transmission shaft includes a first shaft and a second shaft, one end of the second shaft is sleeved on one end of the first shaft, and the one-way bearing is sleeved on the first shaft and connected to the second shaft.

[0008] Furthermore, the motor includes an outer rotor, and the outer rotor is fixedly connected to the second shaft.

[0009] Furthermore, the first shaft is provided with a first tooth, the torque center shaft is provided with a second tooth, and the first tooth is transmission-connected to the second tooth via a transmission tooth set.

[0010] Furthermore, the transmission shaft is arranged parallel to the torque center axis.

[0011] The beneficial effects of the utility model are as follows: the motor and the transmission shaft are connected by a one-way bearing, so that when the motor is not outputting power, the pedal and the motor are completely separated when the rider pedals at high speed, which can protect the controller and the battery. In addition, the electronic outer rotor is linked with the transmission shaft, and the use requirements can be met with a very small reduction ratio. The magnetic resistance is smaller when pedaling, and there is no need to drive the motor to rotate when riding without electricity, which is more labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of the utility model.

[0013] Figure numerals: 1, housing; 2, torque center axis; 3, transmission gear set; 4, motor; 41, outer rotor; 51, first shaft; 52, second shaft; 6, one-way bearing; 7, first tooth; 8, second tooth. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0017] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0018] Since the output end of the current mid-mounted motor is directly connected to the transmission shaft coaxially, when the rider pedals hard, the motor 4 is easily reversely charged, and certain losses are caused to the motor 4, the battery and the controller. Therefore, the utility model designs such a zero magnetic resistance mid-mounted motor, such as Figure 1 As shown, it includes a housing 1 and a torque center shaft 2, a transmission gear set 3 and a motor 4 located in the housing 1. The torque center shaft 2 is connected to the motor 4 through the transmission gear set 3. The transmission gear set 3 includes a transmission shaft. A one-way bearing 6 is provided between the transmission shaft and the rotor of the motor 4. The motor 4 and the transmission shaft are connected through the one-way bearing 6. When the motor 4 outputs power, the output of the motor 4 is linked to the transmission shaft. When the motor does not output power, the torque center shaft cannot drive the outer rotor of the motor to rotate under the action of the one-way bearing. When the rider pedals at high speed, the pedal and the motor 4 are completely separated. The motor 4 will not cause reverse charging, which can protect the controller and the battery.

[0019] Specifically, the transmission shaft includes a first shaft 51 and a second shaft 52, one end of the second shaft 52 is sleeved on one end of the first shaft 52, and the one-way bearing 6 is sleeved on the first shaft and connected to the second shaft. When the motor 4 stops outputting and the torque axis 2 is stepped on at high speed, the first shaft 51 and the second shaft 52 can rotate relative to each other under the action of the one-way bearing 6, that is, the first shaft 51 will not drive the second shaft 52 to rotate, that is, it will not affect the reverse rotation of the motor 4. When the motor 4 outputs normally, that is, the torque axis 2 rotates forward, the second shaft 52 will drive the first shaft 51 to rotate, so that the torque axis 2 rotates forward.

[0020] At present, all the mid-mounted motors 4 on the market are inner rotors, which require a large reduction ratio for transmission, and the magnetic resistance is large when pedaling. The motor 4 in the utility model includes an outer rotor 41, and the outer rotor 41 is fixedly connected to the second shaft 52. The second shaft 52 is driven to rotate by the outer rotor 41, and a very small reduction ratio can meet the use requirements. The magnetic resistance is very small when pedaling. In addition, by providing a one-way bearing 6, the magnetic resistance is further eliminated, so that when the rider pedals at high speed, the pedal and the motor 4 are completely separated, and the magnetic resistance is completely eliminated.

[0021] In addition, the transmission shaft is arranged in parallel with the torque center axis 2 , the first shaft 51 is provided with a first tooth 7 , the torque center axis 2 is provided with a second tooth 8 , and the first tooth 7 is transmission-connected with the second tooth 8 through the transmission tooth set 3 .

[0022] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A zero magnetic resistance mid-mounted motor, comprising a housing (1), a torque center shaft (2), a transmission gear set (3) and a motor (4) located in the housing (1), wherein the torque center shaft (2) is connected to the motor (4) via the transmission gear set (3), and characterized in that: The transmission gear set (3) comprises a transmission shaft, and a one-way bearing (6) is provided between the transmission shaft and the rotor of the motor (4).

2. A zero reluctance mid-mounted motor according to claim 1, characterized in that: The transmission shaft comprises a first shaft (51) and a second shaft (52); one end of the second shaft (52) is sleeved on one end of the first shaft (51); and the one-way bearing (6) is sleeved on the first shaft (51) and connected to the second shaft (52).

3. A mid-mounted motor with zero magnetic resistance according to claim 2, characterized in that: The motor (4) comprises an outer rotor (41), and the outer rotor (41) is fixedly connected to a second shaft (52).

4. A zero reluctance mid-mounted motor according to claim 3, characterized in that: The first shaft (51) is provided with a first tooth (7), the torque center shaft (2) is provided with a second tooth (8), and the first tooth (7) is transmission-connected to the second tooth (8) via a transmission tooth set (3).

5. A mid-mounted motor with zero magnetic resistance according to claim 4, characterized in that: The transmission shaft is arranged parallel to the torque center axis (2).

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