Double-shell built-in motor

Abstract

The utility model relates to a double-shell middle motor which comprises a shell mechanism, a manpower input mechanism, a detection control mechanism, an assisting power output mechanism and a transmission mechanism. Wherein the shell mechanism comprises an outer shell assembly and an inner shell assembly, the double-shell built-in motor is integrally located in a space formed by the outer shell assembly, and the transmission mechanism is arranged in a closed space formed by the inner shell assembly; the manpower input mechanism is used for realizing power input; the detection control mechanism is used for measuring power input by the manual input mechanism; the assistance output mechanism is connected with the detection control mechanism and outputs assistance to the manpower input mechanism through the transmission mechanism according to measurement data of the detection control mechanism. According to the power-assisted bicycle adopting the scheme, better riding experience can be brought to a rider.

Description

Technical Field

[0001] The present application relates to the field of power-assisted bicycles, and in particular to a double-shell mid-mounted motor. Background Art

[0002] Power-assisted bicycles are a new type of transportation that integrates human power and auxiliary power by adding batteries and installing motors on traditional bicycles. In the field of power-assisted bicycles, there are two main types of motor installation positions. The motor installed in the middle of the bicycle body is called a mid-mounted motor, and the motor installed in the bicycle wheel hub is called a hub motor. The mid-mounted motor has a greater advantage in performance.

[0003] Traditional mid-mounted motors usually adopt a single-shell structure. Components such as the torque sensor inside the motor are easily affected by the vibration of other components, resulting in inaccurate measurement data and a poor riding experience. Utility Model Content

[0004] In order to enhance the riding experience of riders, the present application provides a double-shell mid-mounted motor.

[0005] The present application provides a double-shell mid-mounted motor, which adopts the following technical solution:

[0006] A double-shell mid-mounted motor includes a shell mechanism, a human input mechanism, a detection and control mechanism, a power output mechanism and a transmission mechanism; wherein:

[0007] The housing mechanism comprises an outer housing assembly and an inner housing assembly, the double housing mid-mounted motor is entirely located in a space formed by the outer housing assembly, and the transmission mechanism is arranged in a closed space formed by the inner housing assembly;

[0008] The human input mechanism is used to realize power input; the detection control mechanism is used to measure the power input by the human input mechanism; the power output mechanism is connected to the detection control mechanism, and the power output mechanism outputs power to the human input mechanism through the transmission mechanism based on the measurement data of the detection control mechanism.

[0009] The double-shell mid-mounted motor is used to be installed on a power-assisted bicycle. The rider drives the power-assisted bicycle to start through the human input mechanism, and the detection control mechanism detects the power input by the rider, determines the required motor power according to the rider's input power, and controls the power output mechanism to output auxiliary power. The auxiliary power output by the power output mechanism acts on the human input mechanism through the transmission mechanism, so that the rider's human power and the auxiliary power of the motor jointly drive the power-assisted bicycle forward. By setting up an inner shell component, the noise and vibration of the transmission mechanism are isolated from the detection control mechanism, which can improve the detection accuracy and enhance the rider's riding experience.

[0010] Optionally, the transmission mechanism includes a gear pair, and a liquid lubricant for lubricating the gear pair is provided in the enclosed space formed by the inner housing assembly.

[0011] Liquid lubricant is added to the inner housing assembly. As the gear mechanism operates, the liquid lubricant flows to lubricate the meshing gear pair. Steel gears can be used to increase the service life of the transmission mechanism, allowing the mid-mounted motor to take into account both the life of the transmission structure and the rider experience.

[0012] Optionally, the inner shell assembly includes a first inner shell, a second inner shell and a seal, and the first inner shell is sealedly connected to the second inner shell via the seal.

[0013] Optionally, the sealing member includes an integrally formed sealing portion and a positioning portion, the sealing portion includes a plurality of arc segments, the plurality of arc segments are sequentially connected to form a closed contoured structure, and the positioning portion protrudes from an outer edge and / or an inner edge of the closed contoured structure.

[0014] Optionally, the positioning portion is arranged at the connection between adjacent arc segments.

[0015] Optionally, the plurality of arc segments have different curvatures, the angle between the outer edges of adjacent arc segments is the arc segment angle, and the positioning portion is arranged between adjacent arc segments whose arc segment angle is greater than 90 degrees and less than 180 degrees.

[0016] Optionally, the detection and control mechanism includes an electrically connected torque sensor and a control circuit board, wherein the torque sensor is used to detect the power input by the human input mechanism, and the control circuit board is used to receive measurement data of the torque sensor and control the power output mechanism to output power.

[0017] Optionally, the torque sensor is preferably a stress strain torque sensor.

[0018] When a stress strain torque sensor is used as the torque sensor, its measurement data is more easily affected by environmental factors such as temperature and vibration. By setting an inner shell assembly, the noise and vibration generated by the transmission mechanism can be isolated, reducing the impact of environmental factors on the torque sensor.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] By setting up a double shell structure, the transmission mechanism is isolated from other components inside the motor, reducing the impact of the noise and vibration of the transmission mechanism on other components;

[0021] By setting up the inner housing assembly, a closed transmission structure is formed. Liquid lubricant can be added to the inner housing assembly to improve the lubrication effect, and steel gears can be used to increase the service life of the transmission mechanism, so that the mid-mounted motor can take into account both the life of the transmission structure and the rider experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the external overall structure diagram of the double-shell mid-mounted motor.

[0023] Figure 2 It is a schematic diagram of the double-shell structure of the double-shell mid-mounted motor.

[0024] Figure 3 This is the overall internal structure diagram of the double-shell mid-mounted motor.

[0025] Figure 4 It is a schematic diagram of the transmission structure in a double-shell mid-mounted motor.

[0026] Figure 5 It is a schematic diagram of the structure of the seal used to seal the inner housing assembly.

[0027] Explanation of the reference numerals: 100, housing mechanism; 110, housing assembly; 111, first housing; 112, second housing; 120, inner housing assembly; 121, first inner housing; 122, second inner housing; 130, sealing member; 131, sealing portion; 132, positioning portion; 200, human input mechanism; 210, middle shaft; 300, detection and control mechanism; 310, torque sensor; 320, control circuit board; 400, power output mechanism; 500, transmission mechanism; 511, primary driving gear; 512, primary driven gear; 521, secondary driving gear; 522, secondary driven gear; 531, tertiary driving gear; 532, tertiary driven gear. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-5 , further details of this application are given.

[0029] The embodiment of the present application discloses a double-shell mid-mounted motor.

[0030] Reference Figure 1 and Figure 2A double-shell mid-mounted motor is used to be installed on a power-assisted bicycle, and includes a shell mechanism 100, a human input mechanism 200, a detection and control mechanism 300, a power output mechanism 400, and a transmission mechanism 500. The rider drives the power-assisted bicycle to start through the human input mechanism 200, and the detection and control mechanism 300 detects the power input by the rider, determines the required motor power according to the rider's input power, and controls the power output mechanism 400 to output auxiliary power. The auxiliary power output by the power output mechanism 400 acts on the human input mechanism 200 through the transmission mechanism 500, so that the rider's human power and the auxiliary power of the motor jointly drive the power-assisted bicycle forward.

[0031] Reference Figure 1 and Figure 2 The housing mechanism 100 includes an outer housing assembly 110 and an inner housing assembly 120. The outer housing assembly 110 includes a first outer housing 111 and a second outer housing 112, and the central motor is connected to the vehicle frame as a whole through the outer housing assembly 110. The central motor is located in an internal space formed by the first outer housing 111 and the second outer housing 112. The inner housing assembly 120 includes a first inner housing 121 and a second inner housing 122, and the transmission mechanism 500 is located in an internal space formed by the first inner housing 121 and the second inner housing 122. The first inner housing 121 and the second inner housing 122 are sealed and connected by a seal 130. The position where the avoidance hole is opened in the inner housing assembly 120 is sealed and connected to the end faces of other components, so that the internal space of the inner housing assembly 120 is a closed space as a whole.

[0032] Reference Figure 5 The sealing member 130 includes an integrally formed sealing portion 131 and a positioning portion 132. The sealing portion 131 includes a plurality of arc segments with different curvatures, and the plurality of arc segments are connected end to end to form a closed profiling structure, and the closed profiling structure is designed according to the sealing profile of the inner housing assembly 120. The positioning portion 132 is a protrusion protruding from the outer edge of the closed profiling structure, which is arranged on one of the arc segments and is arranged near the connection point of the adjacent arc segments.

[0033] The inner housing assembly 120 is provided with a sealing groove for installing the sealing member 130 and a recess communicating with the sealing groove. The shape of the recess matches the shape of the positioning portion 132 , and the shape of the sealing groove matches the shape of the sealing portion 131 .

[0034] Optionally, the positioning portion 132 may be designed to protrude from the inner edge of the closed contour structure, or the positioning portion 132 may be designed to protrude from both the outer edge and the inner edge of the closed contour structure; the position of the notch of the inner shell assembly 120 may be adjusted accordingly.

[0035] Optionally, when the seal 130 is longer as a whole or has more arc segments, a plurality of positioning portions 132 may be provided, each positioning portion 132 protruding from the outer edge and / or inner edge of the closed contoured structure to facilitate positioning of the seal.

[0036] The angle between the outer edges of adjacent arc segments is defined as the arc segment angle; specifically, the angle between the tangents of two arc segments is defined as the arc segment angle. Figure 5 For example, the included angle of the arc segments of two adjacent arc segments is α. When the included angle of the arc segments is less than 90 degrees, the connection of the adjacent arc segments can form a sharp angle, and it is not easy to have inaccurate installation and positioning. When the included angle of the arc segments is greater than 180 degrees, the connection of the adjacent arc segments forms a curve with a relatively gentle transition. During the working process, the arc segments here are not easy to fall out of the sealing groove. Therefore, the positioning portion 132 is preferably arranged between two adjacent arc segments whose included angle of the arc segments is greater than 90 degrees and less than 180 degrees.

[0037] When sealing, align the positioning portion 132 with the recess and install the sealing portion 131 into the sealing groove, which not only facilitates the installation and positioning of the seal 130 and improves the installation accuracy and efficiency of the seal 130; it also reduces the displacement of the seal 130 during the operation of the workpiece, so that the seal 130 will not fall out of the sealing groove, further increasing the sealing reliability of the inner shell assembly 120.

[0038] Reference Figure 2 and Figure 3 The human input mechanism 200 includes a central axis 210 and a torsion bar. The two ends of the central axis 210 extend out of the first outer shell 111 and the second outer shell 112 respectively and are connected to the frame of the power-assisted bicycle. The rider inputs power to the torsion bar by pedaling the power-assisted bicycle.

[0039] The detection control mechanism 300 is located in the space between the outer housing component 110 and the inner housing component 120, and includes a torque sensor 310 and a control circuit board 320. The torque sensor 310 can be a stress strain torque sensor or a magnetoresistive torque sensor, which is used to detect the power input by the rider through the torsion bar. The torque sensor 310 is electrically connected to the control circuit board 320, and the torque sensor 310 transmits the detected data to the control circuit board 320. The control circuit board 320 determines the auxiliary power to be provided by analyzing the input power of the rider, and drives the power output mechanism 400 to output the auxiliary power.

[0040] When the torque sensor 310 uses a stress strain torque sensor, its measurement data is more easily affected by environmental factors such as temperature and vibration. By setting the inner shell assembly 120, the noise and vibration generated by the transmission mechanism 500 can be isolated, the impact of environmental factors on the torque sensor 310 can be reduced, the accuracy of the detection structure of the torque sensor 310 can be improved, the power input by the rider can be accurately read, and a more suitable auxiliary power can be provided for the rider, thereby improving the rider's riding experience.

[0041] The power output mechanism 400 provides torque by connecting to a power source, and includes a stator and a rotor, which will not be described in detail here.

[0042] Reference Figure 3 and Figure 4 The transmission mechanism 500 is a three-stage gear transmission structure, which includes a primary driving gear 511, a primary driven gear 512, a secondary driving gear 521, a secondary driven gear 522, a third driving gear 531 and a third driven gear 532; the primary driving gear 511 is meshed and connected with the primary driven gear 512, the secondary driving gear 521 is meshed and connected with the secondary driven gear 522, and the third driving gear 531 is meshed and connected with the third driven gear 532. The above gears are preferably helical gears, and the reduction ratio of the gear transmission mechanism can be adjusted and designed according to needs. The primary driving gear 511 is coaxially arranged with the rotor of the power output mechanism 400, the primary driven gear 512 is coaxially arranged with the secondary driving gear 521, the secondary driven gear 522 is coaxially arranged with the third driving gear 531, and the third driven gear 532 is coaxially arranged with the middle shaft 210.

[0043] When the power output mechanism 400 provides auxiliary power, the rotor rotates synchronously with the primary driving gear 511, thereby driving the primary driven gear 512 to rotate. The secondary driving gear 521 rotates synchronously with the primary driven gear 512, thereby driving the secondary driven gear 522 to rotate. The tertiary driving gear 531 rotates synchronously with the secondary driven gear 522, thereby driving the tertiary driven gear 532 to rotate, thereby achieving the output of auxiliary power.

[0044] Transmission mid-mounted motors mostly use an open transmission structure. Since there are other parts inside the mid-mounted motor, grease is often used to lubricate the transmission structure. Power-assisted bicycles have high requirements for rider experience. In order to reduce the sense of frustration during riding, transmission gears use nylon teeth. The vibration generated during the operation of power-assisted bicycles has a great impact on the lubrication and life of nylon teeth.

[0045] The present application adopts a double housing structure, and a closed space is formed inside the inner housing assembly 120. The transmission mechanism 500 is completely located in the closed space. Liquid lubricant can be added to the inner housing assembly 120. As the three-stage gear mechanism operates, the liquid lubricant flows to lubricate the meshing gear pair. Steel gears can be used to increase the service life of the transmission mechanism 500, so that the mid-mounted motor can take into account both the service life of the transmission structure and the rider experience.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A double-shell mid-mounted motor, characterized in that: It includes a housing mechanism, a human input mechanism, a detection and control mechanism, a power output mechanism and a transmission mechanism; wherein, The housing mechanism comprises an outer housing assembly and an inner housing assembly, the double housing mid-mounted motor is entirely located in a space formed by the outer housing assembly, and the transmission mechanism is arranged in a closed space formed by the inner housing assembly; The human input mechanism is used to realize power input; the detection control mechanism is used to measure the power input by the human input mechanism; the power output mechanism is connected to the detection control mechanism, and the power output mechanism outputs power to the human input mechanism through the transmission mechanism based on the measurement data of the detection control mechanism.

2. The double-shell mid-mounted motor according to claim 1, characterized in that: The transmission mechanism comprises a gear pair, and a liquid lubricant for lubricating the gear pair is arranged in the closed space formed by the inner housing assembly.

3. The double-shell mid-mounted motor according to claim 1, characterized in that: The inner housing assembly comprises a first inner housing, a second inner housing and a sealing member, wherein the first inner housing is sealedly connected to the second inner housing via the sealing member.

4. The double-shell mid-mounted motor according to claim 3, characterized in that: The sealing member comprises an integrally formed sealing portion and a positioning portion, the sealing portion comprises a plurality of arc segments, the plurality of arc segments are sequentially connected to form a closed contour structure, and the positioning portion protrudes from an outer edge and / or an inner edge of the closed contour structure.

5. The double-shell mid-mounted motor according to claim 4, characterized in that: The positioning portion is arranged at the connection between adjacent arc segments.

6. The double-shell mid-mounted motor according to claim 4, characterized in that: The plurality of arc segments have different curvatures, the angle between the outer edges of adjacent arc segments is the arc segment angle, and the positioning portion is arranged between adjacent arc segments whose arc segment angle is greater than 90 degrees and less than 180 degrees.

7. The double-shell mid-mounted motor according to claim 1, characterized in that: The detection control mechanism includes an electrically connected torque sensor and a control circuit board, wherein the torque sensor is used to detect the power input by the human input mechanism, and the control circuit board is used to receive measurement data of the torque sensor and control the power output mechanism to output power.

8. The double-shell mid-mounted motor according to claim 7, characterized in that: The torque sensor is a stress strain torque sensor.

Images