CN211076241U - Middle-mounted motor transmission mechanism and electric moped driving system - Google Patents

Abstract

The utility model relates to the technical field of electric assisted bicycles, in particular to a middle-mounted motor transmission mechanism and a driving system of an electric assisted bicycle. The utility model provides a central motor transmission mechanism, a primary transmission shaft and a secondary transmission shaft, the primary transmission shaft is provided with a first transmission tooth and a second transmission tooth, and the number of teeth of the first transmission tooth is larger than that of the second transmission tooth The number of teeth of the first transmission tooth is configured to be connected with the output end of the central motor; the second transmission shaft is provided with a third transmission tooth and a fourth transmission tooth, and the number of teeth of the third transmission tooth is greater than that of the fourth transmission tooth. , the third transmission tooth meshes with the second transmission tooth, and the fourth transmission tooth is configured to be in driving connection with the output shaft. The central motor transmission mechanism can realize multi-stage speed change, and is small in size and convenient for installation. The electric power-assisted vehicle drive system provided by the utility model can realize multi-stage speed change by applying the above-mentioned central motor transmission mechanism, and the volume is small.

Description

A mid-mounted motor transmission mechanism and electric bicycle drive system

technical field

The utility model relates to the technical field of electric assisted bicycles, in particular to a middle-mounted motor transmission mechanism and a driving system of an electric assisted bicycle.

Background technique

Electric bicycles can realize two driving modes, human-driven and electric-assisted, and can provide corresponding electric-assisted support in different proportions according to the strength of the rider's pedaling. The electric assist of electric bicycles usually includes two forms. One is to use the in-wheel motor to realize electric assist. The in-wheel motor is to integrate the motor into the inside of the hub. After the power is turned on, the motor converts the electric energy into mechanical energy, thereby driving the wheels to rotate; the other One is to use the central motor to realize electric power assist. The central motor needs to transmit the power output by the motor to the output shaft of the electric bicycle through the transmission mechanism, and then transmit the power to the crankset through the output shaft, and finally pass the chain to the crankshaft. The power is transmitted to the wheels to realize the rotation of the wheels.

In order to realize the transmission of the power of the central motor and reduce the rotational speed of the central motor, the existing transmission mechanism of the central motor usually includes a plurality of gears in a parallel unfolded layout, which makes the transmission mechanism large in size and occupy a large longitudinal space. , and is not easy to install.

Therefore, there is an urgent need for a new type of mid-mounted motor transmission mechanism to solve the above problems.

Utility model content

One object of the present invention is to provide a central motor transmission mechanism, which can realize multi-stage speed change, and is small in size and convenient for installation.

Another object of the present invention is to provide a driving system for an electric assisted vehicle, which can realize multi-stage speed change by applying the above-mentioned central motor transmission mechanism, and has a small size.

To achieve the above purpose, the following technical solutions are provided:

A central motor transmission mechanism for transmitting the power of the central motor to an output shaft, the central motor transmission mechanism comprises:

A first-stage transmission shaft is provided with a first transmission tooth and a second transmission tooth, the number of teeth of the first transmission tooth is greater than the number of teeth of the second transmission tooth, and the first transmission tooth is configured to be connected with the middle transmission tooth. Set the drive connection of the output end of the motor;

The secondary transmission shaft is provided with a third transmission tooth and a fourth transmission tooth, the number of teeth of the third transmission tooth is greater than that of the fourth transmission tooth, and the third transmission tooth and the second transmission tooth In meshing engagement, the fourth transmission tooth is configured to be in driving connection with the output shaft;

The primary transmission shaft and the secondary transmission shaft are configured to be disposed on both sides of a line connecting the center point of the output end of the central motor and the center point of the output shaft.

As a preferred solution of a mid-mounted motor transmission mechanism, the primary transmission shaft and the secondary transmission shaft are configured to be disposed on both sides of the vertical bisector of the connecting line.

As a preferred solution of the central motor transmission mechanism, the vertical distance H1 from the primary transmission shaft to the connection line ranges from 0 mm to 30 mm, and the vertical distance from the primary transmission shaft to the vertical bisector of the connection line The range of D1 is 0mm～30mm.

As a preferred solution of the central motor transmission mechanism, the vertical distance H2 from the secondary transmission shaft to the connection line ranges from 0 mm to 30 mm, which is equal to the vertical distance of the vertical bisector of the secondary transmission shaft to the connection line. The range of the distance D2 is 0 mm to 30 mm.

As a preferred solution of the central motor transmission mechanism, the vertical distance H1 from the primary transmission shaft to the connection line is 6 mm, and the vertical distance D1 from the primary transmission shaft to the vertical bisector of the connection line is 10 mm.

As a preferred solution of the central motor transmission mechanism, the vertical distance H2 from the secondary transmission shaft to the connection line is 25mm, and the vertical distance D2 from the secondary transmission shaft to the vertical bisector of the connection line is 7mm.

As a preferred solution of the central motor transmission mechanism, the first transmission teeth are located above the second transmission teeth, and the third transmission teeth are located above the fourth transmission teeth.

As a preferred solution of the central motor transmission mechanism, the first transmission teeth, the second transmission teeth, the third transmission teeth and the fourth transmission teeth are all helical teeth.

As a preferred solution of the central motor transmission mechanism, the tooth directions of the first transmission teeth and the second transmission teeth are the same, the tooth directions of the third transmission teeth and the fourth transmission teeth are the same, and the third transmission teeth and the fourth transmission teeth are the same. The tooth direction of the transmission teeth is opposite to the tooth direction of the first transmission teeth.

A drive system for an electric assist vehicle includes a mid-mounted motor, an output shaft, and the above-mentioned mid-mounted motor transmission mechanism, which is used for transmitting the power of the central motor to the output shaft.

Compared with the prior art, the beneficial effects of the present utility model are:

The utility model provides a central motor transmission mechanism, a primary transmission shaft and a secondary transmission shaft, the primary transmission shaft is provided with a first transmission tooth and a second transmission tooth, and the number of teeth of the first transmission tooth is larger than that of the second transmission tooth The number of teeth of the first transmission tooth is configured to be connected with the output end of the central motor; the second transmission shaft is provided with a third transmission tooth and a fourth transmission tooth, and the number of teeth of the third transmission tooth is greater than that of the fourth transmission tooth. , the third transmission tooth meshes with the second transmission tooth, and the fourth transmission tooth is configured to be in driving connection with the output shaft. The central motor transmission mechanism can realize multi-stage speed change, and is small in size and convenient for installation.

The electric power-assisted vehicle drive system provided by the utility model can realize multi-stage speed change by applying the above-mentioned central motor transmission mechanism, and the volume is small.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only of the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to the contents of the embodiments of the present invention and these drawings without creative efforts.

1 is a schematic structural diagram of an electric-assisted vehicle drive system provided by an embodiment of the present utility model;

FIG. 2 is a schematic structural diagram of an angle of an electric-assisted vehicle drive system provided by an embodiment of the present utility model;

FIG. 3 is a schematic structural diagram of another angle of the electric assisted vehicle drive system provided by the embodiment of the present utility model;

4 is a schematic structural diagram of a first housing provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a second housing provided by an embodiment of the present invention.

Reference number:

100-shell; 101-first shell; 102-second shell; 200-center motor; 300-first-stage transmission shaft; 301-first transmission tooth; 302-second transmission tooth; 400-secondary transmission Transmission shaft; 401 - the third transmission tooth; 402 - the fourth transmission tooth;

1-Central axis;

2-shaft sleeve;

3-Output shaft; 31-Crank drive teeth; 32-Motor drive teeth.

Detailed ways

In order for those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In the description of the present invention, it should be noted that the terms "first" and "second" are only used for description purpose, or used to distinguish different structures or components, and should not be construed as indicating or implying relative importance.

In this embodiment, as shown in Figure 1, "horizontal" refers to the width direction of the vehicle body when the electric bicycle is running normally; "depth" refers to the height direction of the vehicle body when the electric bicycle is running normally; When driving, the length of the vehicle body.

As shown in FIGS. 2-3 , this embodiment provides a mid-mounted motor transmission mechanism for transmitting the power of the central motor 200 to the output shaft 3 . The central motor transmission mechanism includes a primary transmission shaft 300 and a secondary transmission shaft 400. The primary transmission shaft 300 is provided with a first transmission tooth 301 and a second transmission tooth 302. The number of teeth of the first transmission tooth 301 is greater than that of the second transmission tooth 301. The number of teeth of the transmission teeth 302, the first transmission tooth 301 is configured to be in driving connection with the output end of the central motor 200; the secondary transmission shaft 400 is provided with a third transmission tooth 401 and a fourth transmission tooth 402, and the third transmission tooth 401 The number of teeth is greater than the number of teeth of the fourth transmission teeth 402 , the third transmission teeth 401 are engaged with the second transmission teeth 302 , and the fourth transmission teeth 402 are configured to be in driving connection with the output shaft 3 . The central motor transmission mechanism can realize multi-stage speed change, and is small in size and convenient for installation.

Specifically, on the one hand, first transmission teeth 301 and second transmission teeth 302 with different numbers of teeth are arranged on the primary transmission shaft 300 , and third transmission teeth 401 and fourth transmission teeth with different numbers of teeth are arranged on the secondary transmission shaft 400 . The teeth 402 can realize multi-stage speed change from the central motor 200 to the output shaft 3 to realize power transmission; On both sides of the connection line between the center point of the end and the center point of the output shaft 3, make full use of the lateral and height space to reduce the longitudinal distance of the central motor transmission mechanism, so as to reduce the distance between the central motor 200 and the output shaft 3. The longitudinal distance can make the structure of the electric bicycle driving system more compact, and at the same time, it is convenient to install the central motor 200 and its transmission mechanism.

Preferably, as shown in FIG. 3 , the first transmission teeth 301 are located above the second transmission teeth 302 , and the third transmission teeth 401 are located above the fourth transmission teeth 402 , making full use of the lateral space and reducing its longitudinal length and height.

Optionally, the first transmission teeth 301 , the second transmission teeth 302 , the third transmission teeth 401 and the fourth transmission teeth 402 are all helical teeth, so as to improve the efficiency of power transmission.

Further, the tooth directions of the first transmission teeth 301 and the second transmission teeth 302 are the same, the tooth directions of the third transmission teeth 401 and the fourth transmission teeth 402 are the same, and the tooth direction of the third transmission teeth 401 is the same as that of the first transmission teeth 301 Teeth are opposite.

In this embodiment, the output end of the central motor 200 is provided with helical teeth, and the helical teeth mesh with the first transmission teeth 301 to transmit power to the primary transmission shaft 300, so that the second transmission teeth 302 follow the The primary transmission shaft 300 rotates and rotates, and further drives the third transmission tooth 401 to transmit the power to the secondary transmission shaft 400, so that the fourth transmission tooth 402 rotates with the rotation of the secondary transmission shaft 400, and finally transmits the power to the secondary transmission shaft 400. output shaft 3.

Further, the output shaft 3 is provided with a tooth plate transmission tooth 31 and a motor transmission tooth 32, the motor transmission tooth 32 meshes with the fourth transmission tooth 402, the tooth plate transmission tooth 31 is connected with the tooth plate transmission, and then the power is transmitted through the chain. Give the wheel, make the wheel turn.

Preferably, the primary transmission shaft 300 and the secondary transmission shaft 400 are configured to be arranged on both sides of the vertical bisector of the connecting line. By arranging the primary transmission shaft 300 and the secondary transmission shaft 400 on both sides of the vertical bisector of the connection line, the space between the central motor 200 and the output shaft 3 can be fully utilized, and it is convenient to transfer the power of the central motor 200 to output shaft 3.

Exemplarily, in this embodiment, the primary transmission shaft 300 and the secondary transmission shaft 400 are located on both sides of the connecting line, and on both sides of the vertical bisector of the connecting line, so as to facilitate power transmission and control the central motor at the same time. 200 and the overall volume of its transmission mechanism.

Preferably, the vertical distance H1 from the primary transmission shaft 300 to the connecting line ranges from 0 mm to 30 mm, and the vertical distance D1 from the primary transmission shaft 300 to the vertical bisector of the connecting line ranges from 0 mm to 30 mm. Further, the vertical distance H2 from the secondary transmission shaft 400 to the connecting line ranges from 0 mm to 30 mm, which is equal to the vertical distance D2 from the secondary transmission shaft 400 to the vertical bisector of the connecting line, which ranges from 0 mm to 30 mm. Through this setting, the reduction ratio range of the central motor transmission mechanism can be controlled between 30 and 70, and the overall size of the electric bicycle drive system can be controlled within 172mm*100mm.

Exemplarily, the length of the connection line is 82 mm, the vertical distance H1 from the primary transmission shaft 300 to the connection line is 6 mm, and the vertical distance D1 from the primary transmission shaft 300 to the vertical bisector of the connection line is 10 mm. The vertical distance H2 from the secondary transmission shaft 400 to the connection line is 25 mm, and the vertical distance D2 from the secondary transmission shaft 400 to the vertical bisector of the connection line is 7 mm.

This embodiment also provides a drive system for an electric assist vehicle, including a mid-mounted motor 200 , an output shaft 3 and the above-mentioned mid-mounted motor transmission mechanism, where the central-mounted motor transmission mechanism is used to transmit the power of the central motor 200 to the output shaft 3 , Through the application of the above-mentioned central motor transmission mechanism, multi-stage speed change can be realized, and the volume is small.

In order to facilitate the installation and support of the central motor 200 , the transmission mechanism of the central motor and the output shaft 3 , as shown in FIGS. Exemplarily, the casing 100 includes a first casing 101 and a second casing 102 , and the first casing 101 and the second casing 102 are assembled to form the casing 100 .

Specifically, a through hole is formed in the first casing 101 , one end of the central motor 200 passes through the through hole, and the other end is fixed on the mounting plate, and then the mounting plate is fixedly connected to the first casing 101 . A first limiting slot is provided in the second housing 102, one end of the primary transmission shaft 300 is rotatably arranged on the mounting plate, and the other end is rotatably arranged in the first limiting slot, and the primary transmission shaft 300 is rotatably arranged in the first limiting slot. A rolling bearing is arranged between the shaft 300 and the first limiting groove to ensure that the primary transmission shaft 300 can rotate stably.

Further, a second limiting slot is provided in the first housing 101, a third limiting slot is provided on the second housing 102, and two ends of the secondary transmission shaft 400 are respectively located in the second limiting slot and the third limiting slot. The three limit slots are connected in rotation to realize the support and installation of the secondary transmission shaft 400 . Rolling bearings are provided between the secondary transmission shaft 400 and the second limiting groove and between the secondary transmission shaft 400 and the third limiting groove to ensure that the secondary transmission shaft 400 can rotate stably.

Preferably, the drive system of the electric assist vehicle further includes a central shaft 1, a shaft sleeve 2 and an overrunning clutch. The shaft sleeve 2 and the central shaft 1 are connected by splines to realize power transmission between the central shaft 1 and the shaft sleeve 2. The shaft sleeve 2 It is connected with the output shaft 3 through an overrunning clutch, so as to transmit the power of the shaft sleeve 2 to the output shaft 3 . In order to install and fix the central axle 1, through holes are provided on both the first casing 101 and the second casing 102, and the two ends of the central axle 1 respectively pass through the two through holes and are connected with the pedal crank. Realize human power transmission.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made to those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present utility model has been described in detail through the above embodiments, the present utility model is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present utility model. Rather, the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A central motor transmission mechanism for transmitting the power of a central motor (200) to an output shaft (3), wherein the central motor transmission mechanism comprises: The primary transmission shaft (300) is provided with a first transmission tooth (301) and a second transmission tooth (302), wherein the number of teeth of the first transmission tooth (301) is greater than that of the second transmission tooth (302). the number of teeth, the first transmission teeth (301) are configured to be in driving connection with the output end of the central motor (200); The secondary transmission shaft (400) is provided with a third transmission tooth (401) and a fourth transmission tooth (402), wherein the number of teeth of the third transmission tooth (401) is greater than that of the fourth transmission tooth (402). the number of teeth, the third transmission tooth (401) is meshed with the second transmission tooth (302), and the fourth transmission tooth (402) is configured to be in driving connection with the output shaft (3); The primary transmission shaft (300) and the secondary transmission shaft (400) are configured to be disposed at the connection between the center point of the output end of the central motor (200) and the center point of the output shaft (3). both sides of the line. 2 . The central motor transmission mechanism according to claim 1 , wherein the primary transmission shaft ( 300 ) and the secondary transmission shaft ( 400 ) are configured to be arranged at the vertical bisector of the connecting line. 3 . both sides of the line. 3 . The central motor transmission mechanism according to claim 2 , wherein the vertical distance H1 from the primary transmission shaft ( 300 ) to the connecting line ranges from 0 mm to 30 mm, and the primary transmission shaft (300) The vertical distance D1 to the vertical bisector of the connecting line ranges from 0 mm to 30 mm. 4 . The central motor transmission mechanism according to claim 3 , wherein the vertical distance H2 from the secondary transmission shaft ( 400 ) to the connecting line ranges from 0 mm to 30 mm, which is equal to the secondary transmission. 5 . The vertical distance D2 from the axis (400) to the vertical bisector of the connecting line ranges from 0 mm to 30 mm. 5 . The central motor transmission mechanism according to claim 4 , wherein the vertical distance H1 from the primary transmission shaft ( 300 ) to the connecting line is 6 mm, and the primary transmission shaft ( 300 ) reaches 6 mm. 6 . The vertical distance D1 of the vertical bisector of the connecting line is 10 mm. 6 . The central motor transmission mechanism according to claim 5 , wherein the vertical distance H2 from the secondary transmission shaft (400) to the connecting line is 25 mm, and the secondary transmission shaft (400) reaches 25 mm. 7 . The vertical distance D2 of the vertical bisector of the connecting line is 7 mm. 7. The central motor transmission mechanism according to any one of claims 1-6, wherein the first transmission tooth (301) is located above the second transmission tooth (302), and the third transmission tooth (302) is located above the second transmission tooth (302). The transmission teeth (401) are located above the fourth transmission teeth (402). 8. The central motor transmission mechanism according to claim 7, wherein the first transmission tooth (301), the second transmission tooth (302), the third transmission tooth (401) and the The fourth transmission teeth (402) are all helical teeth. 9 . The central motor transmission mechanism according to claim 7 , wherein the first transmission teeth ( 301 ) and the second transmission teeth ( 302 ) have the same tooth direction, and the third transmission teeth ( 401) and the tooth direction of the fourth transmission tooth (402) are the same, and the tooth direction of the third transmission tooth (401) is opposite to the tooth direction of the first transmission tooth (301). 10. A drive system for an electric assist vehicle, characterized in that it comprises a central motor (200), an output shaft (3) and the central motor transmission mechanism according to any one of claims 1-9, wherein the central motor The transmission mechanism is used to transmit the power of the central motor (200) to the output shaft (3).

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