WO2023025048A1

WO2023025048A1 - Joint-force output intermediate shaft electric motor of electric bicycle

Info

Publication number: WO2023025048A1
Application number: PCT/CN2022/113512
Authority: WO
Inventors: 沈国栋
Original assignee: 爱克玛电驱动系统(苏州)有限公司
Priority date: 2021-08-23
Filing date: 2022-08-19
Publication date: 2023-03-02
Also published as: CN113715952A

Abstract

A joint-force output intermediate shaft electric motor of an electric bicycle, the intermediate shaft electric motor comprising a motor (1) and a human-powered module (2), wherein the motor (1) and the human-powered module (2) are assembled at a five-way position of a bicycle by means of a housing (3); the human-powered module (2) comprises a mandrel (21); pedals (8) are assembled at two ends of the mandrel (21); the mandrel (21) and an output shaft of the motor (1) are respectively in transmission connection with joint-force assemblies (4a, 4b, 4c); the joint-force assemblies (4a, 4b, 4c) are coaxially assembled with the mandrel (21); the joint-force assemblies (4a, 4b, 4c) comprise inner sleeves (41a, 41b, 41c) connected to the power output of the human-powered module (2), and outer sleeves (42a, 42b, 42c) connected to the power output of the motor (1); middle sleeves (43a, 43b, 43c) for unidirectionally integrating the joint force of the inner sleeves and the outer sleeves are assembled between the inner sleeves (41a, 41b, 41c) and the outer sleeves (42a, 42b, 42c); and ends of the middle sleeves (43a, 43b, 43c) are fixedly assembled with chainrings (5).

Description

Heli output central shaft motor for electric bicycle

technical field

The invention belongs to the technical field of electric motors, and in particular relates to an electric bicycle combined force output central shaft electric motor.

Background technique

An electric power-assisted bicycle is a bicycle that provides auxiliary power through a power supply. The power supply on this bicycle can combine the kinetic energy output by the motor and the kinetic energy driven by the pedals to form a combined force through a combined force mechanism, and the pedaling force can jointly drive the bicycle. Therefore, this bicycle auxiliary structure using electric energy is also often called a resultant force mechanism, a cooperative structure, an auxiliary transmission structure, a double braking structure, and the like.

The motors on electric power-assisted bicycles use different structures according to the different positions of the bicycles. Among them, the motors used in the middle bottom bracket position of the bicycle are usually called center shaft motors. In order to facilitate the modification of the bicycle, the motor can be directly installed in the bottom bracket of the bicycle. The patent with the authorized publication number CN2354868Y discloses a human-machine cooperative mechanism for electric power-assisted bicycles. The mechanism uses an integrated shell structure to integrate the shaft on which the sprocket is installed, the sprocket, the transmission structure and the motor, so that it can be installed on the bicycle. It is more convenient to pass through the position, but its resultant structure is complicated, there are too many parts, and the installation of structures such as sprockets in the mechanism remains unchanged, and this mechanism is not stable enough during operation.

In the patent authorized publication number CN2541317Y, a dual-purpose actuating device for an electric bicycle is disclosed, and in the patent authorized publication number CN2561697Y, an electric auxiliary transmission of a bicycle is disclosed; these two patents also use the shell The body integrates the shaft on which the sprocket is installed, the sprocket, the transmission structure and the motor, and the shaft sleeve structure on the transmission housing can be directly inserted into the bottom bracket of the bicycle. In the structures of these two patents, a combined force transmission structure is further designed. , in this joint force transmission structure, the clutch assembly is realized between the sprocket and the transmission gear through an inner sleeve or linkage body structure. In these two patents, the inner sleeve or linkage body and the mandrel Or when the shaft clutch is assembled, the clutch structure is far away from the assembly position of the sprocket, and one side of the inner sleeve or the linkage body is directly assembled with the spindle or the shaft rod, so that the inner sleeve and the spindle or the linkage body are in contact with the shaft. There is a large friction force between the shafts, so that the friction parts are easily damaged as a whole. At the same time, the overall thickness of this structure is relatively large, which makes the product more bulky. Moreover, the sprockets in these two patents are respectively assembled with the mandrel or shaft through the inner sleeve or the linkage body, and the sprockets in the two patents are respectively assembled with the transmission gear through the inner sleeve or the linkage body; these The structure needs to be assembled independently during assembly, which makes the assembly process of the whole product more complicated. Greatly affected the assembly effect of the whole product.

In addition, in the traditional central shaft motor transmission structure, the sprocket is often directly connected to the output shaft of the power motor, so that when the power-assisted bicycle is started, all transmission parts between the sprocket and the motor must be synchronously driven to run. This makes the pedaling force stronger at the beginning, and when the power motor starts to assist, the pedaling force is greatly reduced, which will cause a greater sense of frustration before and after the assisting, which will affect the riding effect. In addition, after the power supply is used up, due to If the chain wheel and the deceleration structure continue to be linked together, the pure bicycle riding will be subjected to a relatively large torque, which will waste the physical strength of the rider.

Contents of the invention

In view of the above problems, the present invention provides an electric bicycle combined power output center shaft motor with stable and compact structure, convenient installation and use, longer service life, and better riding effect when riding with the help of starting and pedaling alone.

The technical solution adopted by the present invention to solve the technical problem is: the central shaft motor of the combined force output of the electric bicycle includes a motor and a manpower module, the motor and the manpower module are assembled on the bottom bracket of the bicycle through the housing, and the manpower module includes a center shaft, the two ends of the mandrel are equipped with pedals; the mandrel and the output shaft of the motor are respectively connected to the resultant force assembly, the resultant force assembly is coaxially assembled with the mandrel, and the resultant force component includes a power module connected to the manpower module. The output inner sleeve is connected to the outer sleeve of the motor power output. A middle sleeve integrating the combined force of the two is assembled between the inner sleeve and the outer sleeve. The inner sleeve, outer sleeve, and middle sleeve all adopt a ring structure. The inner sleeve, outer sleeve It is connected and assembled with the middle sleeve through rolling parts. A clutch part is installed between the inner sleeve and the middle sleeve when the pedal is stepped forward to move from the inner sleeve to the middle sleeve in one direction. The outer sleeve and the middle sleeve A clutch part for one-way transmission is installed in the middle, and the rotation direction of the inner sleeve to the middle sleeve is the same as that of the outer sleeve to the middle sleeve; the end of the middle sleeve is fixedly assembled with the chainring.

Preferably, the output shaft end of the motor is equipped with an output gear, and a transmission gear meshing with the output gear is designed on the outer casing.

Preferably, the transmission gear is integrally processed with the casing.

Preferably, the mandrel is connected to the inner sleeve through a torque sleeve, the mandrel passes through the torque sleeve, and the inner wall at one end of the torque sleeve is connected to the mandrel in a drive manner, The outer wall of the other end of the torque sleeve is in transmission connection with the inner sleeve, and a torque sensing component is mounted on the torque sleeve.

Preferably, the crankshaft is fixedly connected to the right end of the middle sleeve through a connecting piece, and a through hole is processed in the middle of the connecting piece.

As a preference, the left side of the inner sleeve, the outer sleeve, and the middle sleeve are flush, the right end of the middle sleeve protrudes, the outer wall of the right end of the middle sleeve is processed with external threads, and the through hole of the connecting piece is designed with the An internal thread mates with an external thread.

Preferably, the resultant force component is assembled on the right side of the housing, the output end of the motor on the right side is equipped with an output gear, the right side of the cover of the resultant force component is integrally processed with a transmission gear, and the left side of the housing The cover is sealed and equipped with a round hole in the middle of the cover. The middle hole of the cover is connected with the outer wall of the middle sleeve through a bearing. The cover and the connecting piece are both in the shape of an annular panel protruding rightward in the middle. The right side of the cover protrudes deep into the left side of the connecting piece, the middle of the inner wall of the left end of the connecting piece and the outer wall of the right end of the cover are sealed and assembled through a waterproof ring, and the connection between the connecting piece and the mandrel is passed through a waterproof ring. Dust cap seal assembly.

As a preference, the right end surface of the middle sleeve is processed with more than two threaded holes uniformly distributed along the axis of the middle sleeve, the connecting piece is designed with a through hole corresponding to the threaded hole, and the connecting piece is fixed on the The right side of the middle sleeve.

Preferably, the resultant force component is assembled on the right side of the housing, the output end of the motor on the right side is equipped with an output gear, the right side of the cover of the resultant force component is integrally processed with a transmission gear, and the left side of the housing The cover is sealed and equipped with a round hole in the middle of the cover. The middle hole of the cover is sealed with the outer wall of the outer wall of the combined assembly through a waterproof ring. The through hole in the middle of the connector is connected to the center through an oil seal The right end of the shaft is sealed and assembled, and the outer ring of the connecting piece is sealed and assembled with the outer ring of the jacket.

As a preference, the right end of the middle sleeve is designed with a stepped shaft with a reduced outer diameter, and the left side of the stepped shaft corresponds to a shoulder, and a through threaded hole is processed on the shoulder, and the connecting piece is limited by the shoulder. Assembled on the stepped shaft at the right end of the middle sleeve.

Preferably, the rolling element is a steel ball, the inner wall of the outer casing, the outer wall of the inner casing and the inner and outer walls of the middle casing are respectively designed with positioning grooves for accommodating corresponding steel balls, and the clutch element is an eccentric wedge.

Preferably, the connecting piece is equipped with two crankshafts arranged side by side.

The beneficial effects of the present invention are: the resultant force output center shaft motor of the electric bicycle is usually directly inserted into the bottom bracket of the bicycle through the housing of the motor, the two ends of the spindle are connected to the pedal structure of the bicycle, and the crankshaft and the bicycle chain The transmission assembly is equipped with pedals at the two ends of the spindle. When an electric power-assisted bicycle is ridden with the motor, the mandrel is driven to rotate by stepping on the pedal, and the mandrel transmits the rotation to the inner sleeve of the Heli component. When the inner sleeve rotates relative to the middle sleeve along the pedal movement direction, the inner sleeve The torque is unidirectionally output to the middle sleeve. At this time, the detection structure in the motor detects the pedal movement, and the output shaft of the motor rotates, which drives the outer casing of the resultant component to rotate. The same torque is output to the middle sleeve in one direction, so that the auxiliary power generated by the electric The pedal torque generated by human power jointly drives the chainring to rotate, and finally drives the electric bicycle to run together.

During the operation of the motor, the pedal movement initiated by manpower is finally transmitted to the crankset through the middle sleeve, and the power can be started only after the speed or torque change generated during the manpower use is detected by the detection mechanism, and then the power The output shaft through the motor is finally transmitted to the chain plate through the middle sleeve, and the power plays the role of assisting riding at this time. In the process of movement, the final transmission of manpower to the crankset and the final transmission of electricity to the crankset are both one-way transmission, and the two torques do not interfere with each other before they are finally transmitted to the middle sleeve of the fixed crankset. When the inner sleeve moves, after the inner sleeve transmits power to the middle sleeve, because the outer sleeve is one-way transmission from the outer sleeve to the middle sleeve, the middle sleeve and the outer sleeve are separated, and the middle sleeve moves independently. Electric power will transmit the power to the chainring assembled on the bottom bracket when it is set. In this way, when manpower is used alone for pedaling, the cover of the resultant component is completely disengaged together with the entire transmission structure and the motor, which will not affect the movement of the bicycle, making the movement of the whole bicycle more free; and when the motor is driven to the speed of the cover When it is greater than the speed at which the pedal force is transmitted to the inner sleeve, the inner sleeve and the mandrel assembled inside it are disengaged from the middle sleeve, so that there is no unnecessary loss of electric power during the transmission process, and the utilization rate of electric energy is higher.

In this motor, the power transmitted from the two directions of manpower and electricity is directly synthesized through the combined force component. At the same time, two sets of rotating assembly and two sets of clutch transmission structures are respectively realized. The integrated resultant component structure is used as the combination of manpower and electric power through the middle sleeve at the same time, which is greatly simplified compared with the traditional two separate clutch structures, and the two There will be no interference between the two clutch structures. In addition, the structure of this part is similar to that of the one-way bearing, and it can be assembled and installed as a whole, which makes the overall assembly of the motor more convenient, and also facilitates the batch processing of this part. In this way, the mass processing of this part by a professional company can not only greatly reduce the cost of parts. At the same time, the overall assembly error can be greatly reduced, and finally the overall accumulated error of the motor assembling the component is lower, which effectively improves the service life of the motor.

Description of drawings

Fig. 1 is a structural schematic diagram of the section direction of the central shaft motor for outputting the resultant force of the electric bicycle in Embodiment 1.

Fig. 2 is a structural schematic view of the section direction of the combined force assembly in the first embodiment.

Fig. 3 is a schematic view of the structure of the resultant component in the first embodiment in the front direction.

Fig. 4 is a schematic diagram of the operation process of the resultant force output of the central axis motor of the electric bicycle.

Fig. 5 is a structural schematic view in the cross-section direction of the central shaft motor for the resultant force output of the electric bicycle in Embodiment 2.

Fig. 6 is a schematic structural view of the section direction of the resultant component in the second embodiment.

Fig. 7 is a schematic view of the structure of the resultant component in the second embodiment in the front direction.

Fig. 8 is a structural schematic view in the cross-section direction of the central shaft motor for the resultant force output of the electric bicycle in Embodiment 3.

Fig. 9 is a structural schematic view of the section direction of the resultant component in the third embodiment.

Fig. 10 is a schematic view of the structure of the resultant component in the third embodiment in the front direction.

Detailed ways

Below in conjunction with embodiment the present invention is further described:

The directional words used in this patent, the positional relationship is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the referred device or element must have Certain orientations, constructed and operative in certain orientations, therefore should not be construed as limitations on the present application.

Example 1

As shown in Figure 1, Figure 2 and Figure 3, in Example 1, the central axis motor of the combined force output of the electric bicycle includes a motor 1 and a human power module 2, and the motor 1 and the human power module 2 are assembled on the bottom bracket of the bicycle through a housing 3 position, the manpower module 2 includes a mandrel 21 , and the two ends of the mandrel 21 are equipped with pedals 8 . The feature of this embodiment is that the mandrel 21 and the output shaft of the motor 1 are respectively connected to the resultant force assembly 4 through transmission, the resultant force assembly 4 is coaxially assembled with the mandrel 21, and the resultant force assembly 4 includes a power module connected to a manpower module. The output inner cover 41a is connected to the outer cover 42a of the motor power output. The inner cover 41a and the outer cover 42a are equipped with a middle cover 43a which integrates the combined force of the two. The inner cover 41a, the outer cover 42a and the middle cover 43a all adopt annular Structure, the inner sleeve 41a, the outer sleeve 42a and the middle sleeve 43a are connected and assembled through the rolling member 44a, and the inner sleeve 41a is centered when the pedal is moved forward. The clutch part 45a of the one-way transmission of the sleeve 43a, the clutch part 45 of the one-way transmission is assembled between the outer cover 42a and the middle cover 43a, and the rotation direction of the inner cover 41a to the middle cover 42a is the same as that of the outer cover 43a. Cover 42a transmits torque and rotates in the same direction. When the inner cover 41a and the outer cover 42a rotate in the direction of the arrow relative to the middle cover 43a as described in Figure 3, they can drive the middle cover 43a to rotate, so that the resultant force output can be realized; the middle cover 43a The end and crankshaft 5 are fixedly assembled.

In this embodiment, the central axis motor of the combined force output of the electric bicycle is usually directly inserted into the bottom bracket of the bicycle through the housing 3 of the motor, the two ends of the spindle are connected to the pedal structure of the bicycle, and the crankshaft 5 is assembled with the bicycle chain transmission , the pedals 8 are assembled at both ends of the mandrel 21 . The power synthesis process of the motor is shown in Figure 4. When the electric power-assisted bicycle is ridden with the motor, the mandrel 21 is driven to rotate by stepping on the pedal 8, and the mandrel 21 will rotate to the inner sleeve 41a of the resultant component 4a. When the inner sleeve 41a rotates relative to the middle sleeve 43a along the movement direction of the pedal 8, the torque of the inner sleeve 41a is output to the middle sleeve 43a in one direction. At this time, the detection structure in the motor detects the movement of the pedal 8, and the output shaft of the motor 1 rotates. Drive the outer cover 42a of the resultant force assembly 4a to rotate, and the same torque of the outer cover 42a is output to the middle cover 43a in one direction, so that the auxiliary power generated by electricity and the pedal torque generated by manpower jointly drive the crankset 5 to rotate, and finally jointly drive the electric bicycle to run.

During the running process of the motor, the pedal movement initiated by human power is finally transmitted to the chain plate 5 through the middle sleeve 43a, and the power can be started only after the speed or torque changes generated during the human power use process are detected by the detection mechanism. Then the electric power is transmitted to the crankshaft 5 through the middle sleeve 43a through the output shaft of the motor 1, at this moment, the electric power plays the role of auxiliary riding. In this movement process, the final transmission of manpower to the crankset and the final transmission of electric power to the crankset are both one-way transmissions, and the two torques do not interfere with each other before they are finally transmitted to the middle sleeve 43a of the fixed crankset 5. When the inner cover 41a is driven to move, the inner cover transmits the power to the middle cover 43a, because the outer cover 42a to the middle cover 43a is a one-way transmission, the middle cover 43a is separated from the outer cover 42a, and the middle cover 43a moves independently, and when the electric power starts the motor Finally, only when the rotating speed of outer cover 42a surpasses middle cover 43a, electric power just can power transmission be assembled on the crankshaft 5 on the axle. In this way, when manpower is used to step on the pedal 8 alone, the overcoat 42a of the resultant component 4a is completely disengaged together with the entire transmission structure and the motor 1, which will not affect the movement of the bicycle, so that the movement of the whole bicycle can be made more freely; When the rotational speed transmitted by the motor 1 to the outer sleeve 42a is greater than the rotational speed transmitted to the inner sleeve 41a by the pedaling force, the inner sleeve 41a and the mandrel 11 assembled inside it are disengaged from the middle sleeve 43a, and there is no redundant loss of electric power in the transmission process, and the electric energy Utilization is higher.

In this motor, the power transmitted from the two directions of manpower and electric power is directly synthesized through the resultant component 4a. At the same time, two sets of rotating assembly and two sets of clutch transmission structures are respectively realized. The integrated resultant component structure is used as the combination of manpower and electric power through the middle sleeve at the same time, which is greatly simplified compared with the traditional two separate clutch structures, and the two There will be no interference between the two clutch structures. In addition, the structure of this part is similar to that of the one-way bearing, and can be assembled and installed as a whole, which makes the overall assembly of the motor more convenient. At the same time, the structure is greatly simplified compared with the traditional structure, and it is also convenient for batch processing of this part. This part can not only greatly reduce the cost of the parts, but also greatly reduce the overall assembly error, and finally make the overall accumulated error of the motor assembled with the part lower, effectively improving the service life of the motor. In addition, the resultant component 4a is easy to wear because it has the rolling element 44a and the clutch element 45q, and can be directly replaced as a whole when damaged, which is more convenient for maintenance and use.

In the transmission design in which the motor 1 transmits power to the resultant force assembly 4a, as shown in Figure 1, the output shaft end of the motor 1 is equipped with an output gear 11, and the outer cover 42a is designed with the output gear 11 meshed transmission gear 46a. The diameter of the output gear 11 is smaller than the diameter of the transmission gear 46a, so that when the power is transmitted from the output gear 11 to the transmission gear 46a, it is a deceleration transmission, and the output speed of the power module 1 can be further decelerated in this way. In this embodiment, the transmission gear 46a is integrally processed with the outer casing 42a. This further saves the assembly structure between the transmission gear 46a and the resultant force assembly 4a, and through integral processing, the overall transmission process has higher precision and higher transmission efficiency, and can also effectively reduce the noise in the transmission process.

As shown in FIG. 1 , the mandrel 21 is connected to the inner sleeve 41 through a torque sleeve 22 , the mandrel 21 passes through the torque sleeve 22 , and one end of the torque sleeve 22 The inner wall is in transmission connection with the spindle 21 , the outer wall of the other end of the torque sleeve 22 is in transmission connection with the inner sleeve 41 , and the torque sleeve 22 is equipped with a torque sensing component. In this embodiment, the torque sleeve 22 is drivingly connected to the spindle 21 through the limiting structure on the left side, and the torque sleeve 22 is drivingly connected to the inner sleeve 41a of the resultant force assembly 4a through the key on the right side, In this way, the torque output from the pedal 8 is transmitted to the right side through the left side of the torque sleeve, and the torque acts on the entire length direction of the torque sleeve 22. The overall deformation of the torque sleeve 22 is relatively large, which is more convenient for detection.

The crankset 5 is connected to the assembly on the right side of the upper middle sleeve 43a of the resultant component 4a, and can be assembled directly or through other components. In this embodiment, the crankset 5 is fixedly connected to the right end of the middle sleeve 43a through a connecting piece 51a, and a through hole is processed in the middle of the connecting piece 51a. The tooth plate 5 is connected through the connecting piece 51a, and in this embodiment, the connecting piece 51a and the tooth plate 5 are locked and connected by a plurality of bolts. The use of the connecting piece 51a makes it possible to use the same tooth plate 5 in different types of motor structures, and only needs to design the specific structure of the connecting piece 51a, which greatly reduces the structure of the changed parts and facilitates tooth alignment. Disc 5 produces a large number of spare parts, which reduces production risks.

In Embodiment 1, as shown in Figure 1 and Figure 2, the left side of the inner sleeve 41a, the outer sleeve 42a, and the middle sleeve 43a are flush, and the right end of the middle sleeve 43a protrudes, that is, the right side of the middle sleeve 43a protrudes. Show the position of the right section of the inner sleeve 41a and the outer sleeve 42a. An external thread is processed on the outer wall of the right end of the middle sleeve 43a, and an internal thread engaged with the external thread is designed on the through hole of the connecting piece 51a. That is, the connecting piece 51a is assembled on the right side of the middle sleeve 43a by threading, so that the connecting piece 51a of the crankset 5 can be assembled directly by rotating the connecting piece 51a, and the connecting piece 51a can be opposite to each other. The locking direction of the middle cover is designed correspondingly to the pedaling direction of the pedal 8, so that during the pedaling process, the connecting piece 51a on the tooth plate 5 is more firmly screwed on the right side of the middle cover 43a.

In Embodiment 1, the resultant force component 4a is assembled on the right side of the housing 3, the output end of the motor 1 is equipped with an output gear 11, and the right side of the cover 42a of the resultant force component 4a is integrally processed with a transmission The gear 46a, the transmission gear 46a is designed on the right side of the outer cover 42a, and the outer space on the left side of the outer cover 42a can be made available for assembling other structures. The left side of the housing 3 is sealed with a cover, and a round hole is processed in the middle of the cover 31 to facilitate the extension of the mandrel 21 and other structures. The middle round hole of the cover 31a is connected with the outer wall of the middle sleeve 43a through the bearing 32a. The cover 31a and the connecting piece 51a are both in the shape of an annular panel protruding to the right in the middle, and the right side of the cover 31a protrudes deeply. to the left side of the connecting piece 51a, which can make the whole structure more compact. The inner wall of the left end of the connecting piece 51 a is sealed and assembled with the outer wall of the right end of the cover 31 a through the waterproof ring 9 , and the connecting piece 51 a and the mandrel 21 are sealed and assembled through the dustproof cover 10 . In this embodiment, the connecting piece 51a not only plays the role of connecting the middle sleeve 43a and the tooth plate 5, but also plays the role of a dustproof and waterproof closed cover plate. The middle sleeve 43a is combined with the right end face of the housing 3, and the 4a combined force assembly and other components are closed by the sealing elements such as the waterproof ring 9 and the dust cover 10 to seal the transmission structure as a whole, dustproof and waterproof, which can effectively improve the transmission structure. service life. At the same time, the structural design of the threaded connection of the middle sleeve 43a enables the thickness of the middle sleeve 43a to be designed to be thinner, so that the overall weight of the combined force assembly 4a is greatly reduced.

Example 2

In Embodiment 2, as shown in Fig. 5, Fig. 6 and Fig. 7, the power module 1, the manpower module 2, and the casing 3 are all the same in structure as in Embodiment 1, and the assembly method and working method are the same, and the resultant force assembly 4b as a whole The transmission structure is the structure that adopts inner sleeve 41b, outer sleeve 42b, middle sleeve 43b, rolling element 44b, and clutch element 45b. The transmission principle of embodiment 2 is substantially the same as that of embodiment 1, so the structure of this embodiment also has the structure of embodiment 1. Among them, the advantages of combining manpower and electric power output, for example, in Fig. 7, when the inner sleeve 41b and the outer sleeve 42b are rotated in the direction of the arrow relative to the middle sleeve 43b, they can drive the middle sleeve 43b to rotate to realize the output of the combined force, the working mode and Embodiment 1 is the same, so the same structure and corresponding advantages will not be repeated here.

Although the transmission structure of the resultant force assembly 4b is similar, the parts of the resultant force assembly 4b that are assembled with the crankset 5 adopt different assembly methods. In Example 2, the right end surface of the middle sleeve 43b is processed with more than two threaded holes uniformly distributed along the axis of the middle sleeve 43b, and the connecting piece 51b is designed with through holes corresponding to the positions of the threaded holes. The connecting piece 51b is fixed on the right side of the middle sleeve 43b by a bolt 52b. In this embodiment, the outer end surfaces of the upper inner sleeve 41b, the outer sleeve 42b, and the middle sleeve 43b of the resultant component 4b all adopt the same plane. Such a structural design makes the structural design of both sides more simple, such as the connector 51b The design on the right side is relatively flat, which is convenient for the design and processing of parts. At the same time, the connecting piece 51b is locked and connected with the right end of the middle sleeve 43b through evenly distributed bolts, so that the connection between the connecting piece 51b and the middle sleeve 43b The torque transmission is more uniform, and at the same time, this structure uses the entire end surface on the right side of the middle sleeve 43b as a positioning surface, which makes it easier to ensure the perpendicularity between the tooth plate 5 assembled on the connecting piece 51b and the spindle 21 .

In the specific design of Embodiment 2, the resultant force assembly 4b is assembled on the right side of the housing 3, the output end of the motor 1 is equipped with an output gear 11, and the right side of the jacket 42b of the resultant force assembly 4b is integrally processed There is a transmission gear 46b, the left side of the housing 3 is sealed with a cover 31b, and a round hole is processed in the middle of the cover 31b, and the middle hole of the cover 31b is jacketed with the resultant component 4b through a waterproof ring 9 The outer wall of 42b is sealed and assembled, the middle through hole of the connecting member 51b is sealed and assembled with the right end of the spindle 21 through the oil seal 7, and the outer ring of the connecting member 51b is sealed and assembled with the outer ring of the outer casing 42b. In this embodiment, the connector 51b seals the entire right side of the resultant component 4b through the oil seal 7 and the waterproof ring 9, and at the same time cooperates with the cover 31b, so that the resultant component 4b and the electric power are connected to the resultant component 4b. The transmission structure between them is all closed, which can effectively prevent external water and dust from entering it, making the service life of the product longer. In this embodiment, the connecting piece 51b not only plays the role of connecting the middle sleeve 43b and the crankset 5, but also plays the role of a dustproof and waterproof closed cover.

Example 3

In Embodiment 3, as shown in Fig. 8, Fig. 9 and Fig. 10, the power module 1, the manpower module 2, and the housing 3 are all the same in structure as in Embodiment 1, and the assembly method and working method are the same, and the resultant force assembly 4c as a whole The transmission structure is the structure that adopts the inner sleeve 41c, the outer sleeve 42c, the middle sleeve 43c, the rolling element 44c, and the clutch element 45c. The outer sleeve 42b is also integrally processed with a transmission gear 46b. Its structure and transmission principle are the same as those in Embodiment 1 and Embodiment 2 is substantially the same, and will not be repeated here.

In this embodiment, the assembly structure of the middle sleeve 43c, the connecting piece 51c and the cover 31c is substantially the same as that of Embodiment 2. In this embodiment, the right end of the middle sleeve 43c is designed with a stepped shaft with a reduced outer diameter, and the left side of the stepped shaft corresponds to a shoulder 431c, and a through threaded hole is processed on the shoulder 431c, and the connecting piece 51c is limitedly fitted on the stepped shaft at the right end of the middle sleeve 43c through the shaft shoulder 431c. The stepped shaft positioning on the right side of the middle sleeve 43c plays a role in positioning the connecting piece, and the shoulder 431c acts as a limiter in the axial direction, which can ensure that the connecting piece 51c together with the chainring on it 5 The assembly position is more accurate, and the assembly is also more firm, and the use effect is better.

In embodiment 1 and embodiment 2, as shown in Fig. 1-3, Fig. 4-5, described rolling element (44a, 44b) all uses steel ball, and described outer cover (42a, 42b) inner wall, inner cover (41a , 41b) and the inner and outer walls of the middle sleeve (43a, 43b) are respectively designed with positioning grooves to accommodate corresponding steel balls, and the clutch parts (45a, 45b) are eccentric wedge blocks. This structure enables the middle sleeve (43a, 43b) to form a one-way bearing structure with the inner sleeve (41a, 41b) and the outer sleeve (42a, 42b) respectively. Such a structure can be produced by more manufacturers. It is also more convenient.

In Embodiment 1 and Embodiment 3, as shown in FIG. 1 and FIG. 8 , two parallel cranksets 5 are mounted on the connecting piece ( 51 a , 51 c ). Should like this in these two embodiments, two cranksets can design more speed change gears on the variable speed bicycle.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims

A center shaft motor for combined force output of an electric bicycle, which includes a motor and a manpower module, the motor and the manpower module are assembled on the bottom bracket of the bicycle through a housing, the manpower module includes a mandrel, and the two ends of the mandrel are assembled Pedal; it is characterized in that: the mandrel and the output shaft of the motor are respectively connected to the resultant force component, the resultant force component is coaxially assembled with the mandrel, the resultant force component includes an inner sleeve connected to the power output of the manpower module, and is connected to The outer cover of the motor power output, the inner cover and the outer cover are equipped with a middle cover integrating the combined force of the two. The inner cover, the outer cover and the middle cover all adopt a ring structure, and the inner cover, the outer cover and the middle cover pass The rolling parts are connected and assembled, the inner sleeve and the middle sleeve are equipped with a clutch for one-way transmission from the inner sleeve to the middle sleeve when the pedal is stepped forward, and a one-way transmission is installed between the outer sleeve and the middle sleeve. The clutch part, the rotation direction of the torque transmission from the inner sleeve to the middle sleeve is the same as the rotation direction of the torque transmission from the outer sleeve to the middle sleeve; the end of the middle sleeve is fixedly assembled with the chainring.
According to claim 1, the center shaft motor with combined force output of the electric bicycle is characterized in that: the output shaft end of the motor is equipped with an output gear, and the outer casing is designed with a transmission gear meshing with the output gear.
According to claim 2, the central axis motor for combined power output of an electric bicycle is characterized in that: the transmission gear is integrally processed with the outer casing.
According to any one of claims 1-3, the central axis motor for combined force output of an electric bicycle is characterized in that: the mandrel and the inner sleeve are connected through a torque sleeve, and the mandrel is connected from the torque The sleeve passes through, the inner wall of one end of the torque sleeve is connected to the spindle by transmission, the outer wall of the other end of the torque sleeve is connected to the inner sleeve by transmission, and a torque sensing component is mounted on the torque sleeve.
According to any one of claims 1-3, the central shaft motor for combined power output of an electric bicycle is characterized in that: the crankshaft is fixedly connected to the right end of the middle sleeve through a connecting piece, and a penetrating hole is processed in the middle of the connecting piece. through hole.
According to claim 4, the electric bicycle combined power output center shaft motor is characterized in that: the crankshaft is fixedly connected to the right end of the middle sleeve through a connecting piece, and a through hole is processed in the middle of the connecting piece.
According to claim 5, the central axis motor for combined output of electric bicycles is characterized in that: the right end of the middle sleeve protrudes, the outer wall of the right end of the middle sleeve is processed with external threads, and the through hole of the connecting piece is designed with The external thread engages the internal thread.
According to claim 6, the central shaft motor for combined force output of an electric bicycle is characterized in that: the right end of the middle sleeve protrudes, the outer wall of the right end of the middle sleeve is processed with external threads, and the through hole of the connecting piece is designed with The external thread engages the internal thread.
According to claim 7, the electric bicycle resultant force output central shaft motor is characterized in that: the resultant force assembly is assembled on the right side of the housing, the right output end of the motor is equipped with an output gear, and the resultant force assembly The right side of the casing is integrally processed with a transmission gear, and the left side of the casing is sealed with a cover, and a round hole is processed in the middle of the cover, and the middle hole of the cover is connected with the outer wall of the middle sleeve through a bearing. Both the cover and the connecting piece are in the shape of an annular panel protruding to the right in the middle, the right side of the cover protrudes deep into the left side of the connecting piece, and the inner wall at the left end of the connecting piece passes through the middle of the outer wall at the right end of the cover Waterproof ring seal assembly.
According to claim 8, the electric bicycle resultant force output central shaft motor is characterized in that: the resultant force assembly is assembled on the right side of the housing, the output end on the right side of the motor is equipped with an output gear, and the resultant force assembly The right side of the casing is integrally processed with a transmission gear, and the left side of the casing is sealed with a cover, and a round hole is processed in the middle of the cover, and the middle hole of the cover is connected with the outer wall of the middle sleeve through a bearing. Both the cover and the connecting piece are in the shape of an annular panel protruding to the right in the middle, the right side of the cover protrudes deep into the left side of the connecting piece, and the inner wall at the left end of the connecting piece passes through the middle of the outer wall at the right end of the cover Waterproof ring seal assembly.
According to claim 5, the central shaft motor for combined power output of an electric bicycle is characterized in that: the right end surface of the middle sleeve is processed with more than two threaded holes uniformly distributed along the axis of the middle sleeve, and the connecting piece is designed with the The threaded holes correspond to the through holes, and the connecting piece is fixed on the right side of the middle sleeve by bolts.
According to claim 6, the central shaft motor for combined power output of an electric bicycle is characterized in that: the right end surface of the middle sleeve is processed with more than two threaded holes uniformly distributed along the axis of the middle sleeve, and the connecting piece is designed with the The threaded holes correspond to the through holes, and the connecting piece is fixed on the right side of the middle sleeve by bolts.
According to claim 11, the resultant force output central axis motor of an electric bicycle, wherein the resultant force assembly is assembled on the right side of the housing 3, and the output end on the right side of the motor is equipped with an output gear, and the resultant force assembly The right side of the casing is integrally processed with a transmission gear, the left side of the housing is sealed and equipped with a cover, and a round hole is processed in the middle of the cover. The outer wall is sealed and assembled, and the middle through hole of the connecting piece is sealed and assembled with the right end of the mandrel through an oil seal.
According to claim 12, the electric bicycle resultant force output center shaft motor is characterized in that: the resultant force assembly is assembled on the right side of the housing, the right output end of the motor is equipped with an output gear, and the resultant force assembly The right side of the casing is integrally processed with a transmission gear, and the left side of the housing is sealed with a cover, and a round hole is processed in the middle of the cover, and the middle hole of the cover is connected with the outer wall of the combined component casing through a waterproof ring. Sealed assembly, the through hole in the middle of the connecting piece is sealed with the right end of the mandrel through an oil seal.
According to claim 13, the central shaft motor for combined force output of an electric bicycle is characterized in that: the right end of the middle sleeve is designed with a stepped shaft with a reduced outer diameter, and the left side of the stepped shaft corresponds to a shaft shoulder, and the shaft shoulder is A through threaded hole is processed, and the connecting piece is fitted on the stepped shaft at the right end of the middle sleeve through the shoulder limit.
According to claim 14, the central shaft motor for combined force output of an electric bicycle is characterized in that: the right end of the middle sleeve is designed with a stepped shaft with a reduced outer diameter, and the left side of the stepped shaft corresponds to a shaft shoulder, and the shaft shoulder is A through threaded hole is processed, and the connecting piece is fitted on the stepped shaft at the right end of the middle sleeve through the shoulder limit.
According to claim 1, the central axis motor for combined force output of an electric bicycle is characterized in that: the rolling elements are steel balls, the inner wall of the outer casing, the outer wall of the inner casing, and the inner and outer walls of the middle casing are respectively designed with positioning grooves for accommodating corresponding steel balls. The clutch part is a eccentric wedge block.
According to claim 5, the center axis motor of the combined force output of the electric bicycle is characterized in that: the connecting piece is equipped with two chainrings arranged side by side.