Hybrid drive system and electric bicycle with hybrid drive system

Abstract

Hybrid drive system, characterized in that it comprises: a center-mounted power module and a rear-mounted power module; wherein the center-mounted power module comprises a center-mounted module housing, a center-mounted drive assembly, and a foot pedal and a crank, wherein the center-mounted drive assembly is coaxially installed within the center-mounted module housing, wherein the foot pedal and the crank are coaxially connected to the center-mounted drive assembly by an end cap of the center-mounted module housing; wherein the center-mounted drive assembly uses a human drive mode or a human-electric hybrid drive mode, wherein the center-mounted drive assembly of the human drive mode is driven by applying human power to the foot pedal as a power input, while the center-mounted drive assembly of the human-electric hybrid drive mode is driven by applying human power to the foot pedal as a power input, or by a center-mounted motor drive assembly installed in the center-mounted module housing providing a power input. wherein the rear-mounted power module comprises a rear-mounted module housing and a rear-mounted drive assembly, the rear-mounted drive assembly coaxially installed within the rear-mounted module housing, a center-mounted power output end of the center-mounted drive assembly being transmittively connected to the rear-mounted drive assembly by a transmission assembly; wherein the rear-mounted drive assembly comprises a rear-mounted motor drive assembly, the rear-mounted motor drive assembly comprising a downforce state and a drive state, wherein in the downforce state the rear-mounted motor drive assembly passively rotates with power from the center-mounted drive assembly, while in the drive state the rear-mounted motor drive assembly actively rotates, an output power of the rear-mounted motor drive assembly being transmittively connected to a drive wheel through a rear-mounted power output end.

Description

TECHNICAL FIELD

[0001] The present utility model relates to the field of electric bicycles, in particular a hybrid drive system and an electric bicycle with a hybrid drive system. STATE OF THE ART

[0002] Currently, the drive mechanism of existing electric bicycles is generally divided into two types: the center-mounted human drive combined with a rear-mounted hub motor, and the center-mounted motor drive. The first is a traditional drive mechanism. Like human drive, the rider pedals the center-mounted pedals, and the power is transmitted to the flywheel of the rear hub motor through the center shaft and chain. The disadvantage is that some energy is lost during transmission. Then, the rear wheel is driven to rotate, with the hub motor as the center shaft. The vehicle needs a lot of power to start from a standstill until the wheels rotate, and the unsprung mass increases due to the presence of the hub motor, which reduces the dynamic efficiency of the bicycle and leads to a large energy loss.When using an electric drive, the rear-mounted hub motor serves as a direct drive to the rear wheel. From a standstill to starting, the bicycle consumes a lot of power. The power consumption at startup is high, which has a significant impact on the battery life and the bicycle's range. The second is a center-mounted motor drive. The drive module uses a parallel shaft gear transmission or a gear and belt transmission. The disadvantage of this is its complex structure. The gear contact area is small. After long-term use, wear and tear will increase the backlash, causing the gear structure to make abnormal noise, reducing transmission efficiency.In addition, because the human drive assembly and the motor drive assembly are relatively independent assemblies, the entire module has a large volume, and there are a lot of restrictions on the frame design. CONTENT OF THE PRESENT UTILITY MODEL

[0003] The purpose of the present utility model is to provide a hybrid drive system and an electric bicycle with a hybrid drive system.

[0004] In order to solve the above technical problems, the present utility model provides a hybrid drive system.

[0005] A hybrid propulsion system comprising a mid-mounted power module and a rear-mounted power module, the mid-mounted power module comprising a mid-mounted module housing, a mid-mounted drive assembly, and a foot pedal and a crank, the mid-mounted drive assembly being coaxially installed within the mid-mounted module housing, the foot pedal and the crank being coaxially connected to the mid-mounted drive assembly by an end cap of the mid-mounted module housing, the mid-mounted drive assembly using a human propulsion mode or a human-electric hybrid propulsion mode, the mid-mounted drive assembly of the human propulsion mode being powered by applying human power to the foot pedal as a power input while the mid-mounted drive assembly of the human-electric hybrid propulsion mode is powered,by applying human force to the foot pedal as a power input, or by providing a power input from a center-mounted motor drive assembly installed in the center-mounted module housing, wherein the rear-mounted power module comprises a rear-mounted module housing and a rear-mounted drive assembly, the rear-mounted drive assembly being coaxially installed within the rear-mounted module housing, a center-mounted power output end of the center-mounted drive assembly being transmittively connected to the rear-mounted drive assembly by a transmission assembly, the rear-mounted drive assembly comprising a rear-mounted motor drive assembly, the rear-mounted motor drive assembly comprising an output state and a drive state,wherein the rear-mounted motor drive assembly rotates passively with the power of the centrally mounted drive assembly in the downforce state, while the rear-mounted motor drive assembly rotates actively in the drive state, wherein an output power of the rear-mounted motor drive assembly is transmittively connected to a drive wheel through a rear-mounted power output end.

[0006] The present utility model has the following advantageous effects: In the present utility model, the center-mounted power module uses a hybrid drive mode consisting of a human drive and a human-electric hybrid drive, which, in combination with the installation of a rear-mounted motor drive assembly or a transmission on the drive wheel, provides a variety of drive combinations for different application scenarios.In addition, the centrally mounted motor drive assembly and the transmission structure by human drive adopts a coaxial installation method, which greatly reduces the overall volume of the drive device, has a stable structure, high transmission efficiency and good module versatility, improves the riding experience of the entire electric bicycle, provides a completely new way of thinking for the design and development of the electric bicycle, and effectively solves the problems of the existing technology on the market. SHORT DESCRIPTION OF THE DRAWING Fig. 1 shows a schematic diagram of the structure of a center-mounted power module of the present utility model; Fig. 2 shows a schematic diagram of the sectional structure of the centrally mounted power module of the present utility model; Fig. 3 shows a disassembled exploded view of a rear-mounted power module with a gearbox; Fig. 4 shows a schematic diagram of a three-dimensional combined structure of an electric bicycle with a hybrid drive system; Fig. 5 shows a schematic diagram of the structure of a rear frame transmission assembly of the present utility model. DETAILED DESCRIPTION

[0007] In order to enable the person skilled in the art to better understand the technical solution of the present utility model, a detailed description of the present utility model follows in conjunction with the attached drawings and concrete embodiments.

[0008] As in Fig. 1 to 3, the present utility model provides a hybrid propulsion system comprising a center-mounted power module 312 and a rear-mounted power module 313, wherein the center-mounted power module 312 includes a center-mounted module housing 3121, a center-mounted drive assembly 3122, and a foot pedal and crank 3123, wherein the center-mounted drive assembly 3122 is coaxially installed within the center-mounted module housing 3121, wherein the foot pedal and crank 3123 are coaxially connected to the center-mounted drive assembly 3122 by an end cap of the center-mounted module housing 3121, wherein the center-mounted drive assembly 3122 uses a human propulsion mode or a human-electric hybrid propulsion mode, wherein the center-mounted drive assembly 3122 of the human propulsion mode is driven by applying human power to the foot pedal as a power input,while the center-mounted drive assembly 3122 of the human-electric hybrid drive mode is driven by applying human power to the foot pedal as a power input, or by a center-mounted motor drive assembly installed in the center-mounted module housing 3121 providing a power input, wherein the rear-mounted power module 313 comprises a rear-mounted module housing 3131 and a rear-mounted drive assembly, wherein the rear-mounted drive assembly is coaxially installed within the rear-mounted module housing 3131, wherein a center-mounted power output end of the center-mounted drive assembly 3122 is transmittively connected to the rear-mounted drive assembly through a transmission assembly, wherein the rear-mounted drive assembly comprises a rear-mounted motor drive assembly or a transmission assembly,wherein the rear-mounted motor drive assembly comprises an output state and a drive state, wherein in the output state the rear-mounted motor drive assembly passively rotates with the power of the centrally mounted drive assembly 3122, while in the drive state the rear-mounted motor drive assembly actively rotates and the centrally mounted drive assembly 3122 is in a clutch state, wherein the transmission assembly adjusts the gear ratio to the power of the centrally mounted drive assembly, wherein an output of the rear-mounted motor drive assembly or the transmission assembly is transmittively connected to a drive wheel through a rear-mounted power output end.

[0009] In this embodiment, the mid-mounted power module uses a human-electric hybrid drive method consisting of human drive and motor drive. Combined with the installation of a rear-mounted motor drive assembly or a transmission on the drive wheel, it provides a variety of drive combinations for different application scenarios. Furthermore, the mid-mounted motor drive assembly and the transmission assembly through human drive use a coaxial installation method, which significantly reduces the overall volume of the drive device, has a stable structure, high transmission efficiency, and good module versatility, improves the riding experience of the entire electric bicycle, provides a completely new way of thinking for the design and development of the electric bicycle, and effectively solves the problems of the existing technology on the market.

[0010] Specifically, the mid-mounted power module 312 is powered by a hybrid drive system combining human propulsion and motor propulsion, while the rear-mounted power module 313 provides motor propulsion or transmission. Thus, the combination of the mid-mounted drive and the rear drive can enable a variety of drive combinations for different application scenarios.

[0011] Here, the human-powered foot pedal and crank 3123 and the centrally mounted motor drive assembly form a coaxial installation structure. The coaxially installed motor can be driven in synchronous rotation during human power generation to achieve power generation and function as a power generation unit to charge the battery pack or supply power to other loads. When the centrally mounted power module 312 adopts a structure driven solely by human power, the rear-mounted power module 313 should adopt a rear-mounted motor drive assembly instead of a gear assembly to realize the electric drive of the electric bicycle.When the center-mounted power module 312 adopts a motor drive structure, the center-mounted motor drive assembly outputs power to the rear-mounted power module 313 through the center-mounted power output end coaxial with the human drive, and the rear-mounted power module 313 transmits the power to the drive wheel to realize the drive of the bicycle.

[0012] In the rear-mounted power module 313, the rear-mounted drive assembly, if a rear-mounted motor drive assembly, is capable of forming a combined drive mode with the mid-mounted power module 312, and the rear-mounted drive assembly, if a transmission assembly 3134, is capable of providing a preset variable speed setting for the output of the mid-mounted power module 312 so that it can meet various driving scenarios.

[0013] Specifically, when the rear-mounted motor drive assembly is in a driving state, the rear-mounted motor drive assembly is coupled to the mid-mounted drive assembly 3122, and only the rear-mounted motor drive assembly supplies power to the drive wheel of the electric bicycle. It is also possible for the mid-mounted drive assembly 3122 and the rear-mounted motor drive assembly to jointly supply power to the drive wheel of the electric bicycle to increase the riding performance of the electric bicycle.

[0014] The center-mounted drive assembly 3122 includes a center-mounted first-stage drive assembly and a center-mounted second-stage drive assembly installed coaxially, the center-mounted first-stage drive assembly including a center-mounted center shaft and a first-stage planetary gear set, the center-mounted second-stage drive assembly including a hollow sleeve shaft having a first-stage sun gear and an output end adapter attached to each end thereof, the hollow sleeve shaft being coaxially mounted on an outer side of the center-mounted center shaft, the first-stage sun gear engaging the center of the first-stage planetary gear set, and a first-stage internal gear ring attached to an inner wall of the center-mounted module housing, the first-stage planetary gear set cooperatively engaging the first-stage internal gear ring.wherein the foot pedal transmits the applied human power through the crank to the centrally mounted center shaft, wherein the centrally mounted center shaft is capable of driving the first-stage planetary gear set to rotate within a limited range of the first-stage internal gear ring, whereby the output end adapter outputs the power through the transmission of the first-stage sun gear.

[0015] The center-mounted drive assembly 3122 further comprises a third-stage motor drive assembly, wherein the third-stage motor drive assembly is coaxially mounted on the outside of the hollow sleeve shaft, wherein a second-stage sun gear is provided at an output end of the third-stage motor drive assembly, wherein the center-mounted second-stage drive assembly further comprises a second-stage planetary gear set cooperatively connected to the hollow sleeve shaft, wherein the center-mounted module housing is further fixedly connected at the inner wall to a second-stage internal gear ring, wherein the second-stage planetary gear set cooperatively meshes with the second-stage internal gear ring, wherein the second-stage sun gear is cooperatively meshed in the center of the second-stage planetary gear set, wherein the first-stage sun gear is capable of driving the second-stage planetary gear set in the human drive mode,that it rotates within the limited range of the second-stage internal gear ring, whereby the third-stage motor drive assembly is driven in rotation by the second-stage sun gear to generate electricity, wherein the third-stage motor drive assembly actively rotates in the electric drive mode and is capable of driving the second-stage planetary gear set through the second-stage sun gear to rotate within the limited range of the second-stage internal gear ring, whereby the output end adapter of the hollow sleeve shaft outputs the power.

[0016] The first-stage planetary gear set includes a center-mounted clutch, with the center-mounted drive assembly operating in electric drive mode. During rotation of the second-stage sun gear, which drives the second-stage planetary gear set and the hollow sleeve shaft, the center-mounted clutch disengages the power of the first-stage planetary gear set with respect to the first-stage sun gear, which is coupled to the hollow sleeve shaft, thus preventing passive rotation of the foot pedal and crank.

[0017] In the above embodiment, the third-stage motor drive assembly may preferably be implemented with both an inner rotor motor and an outer rotor motor.

[0018] Based on the above embodiment, the rear-mounted power module 313 can preferably be implemented in two ways: one is that the rear-mounted drive assembly uses a motor drive method and forms a variety of drive combination methods with the mid-mounted power module 312; the other is that the rear-mounted drive assembly uses a gear box to adjust the output power of the mid-mounted power module 312 at variable speeds to utilize various driving scenarios.

[0019] As in Fig.4 to 5, the present utility model further provides an electric bicycle with a hybrid drive system, comprising a front wheel assembly 1, a main frame assembly 2, and a rear wheel assembly 3, the rear wheel assembly 3 comprising a rear frame transmission assembly 31 and a rear wheelset assembly 32, the rear frame transmission assembly 31 comprising a rear frame 311, a transmission assembly, and a hybrid drive system according to the above embodiment, the front wheel assembly 1 being cooperatively installed on a front side of the main frame assembly 2, the rear frame 311 being cooperatively installed on a rear side of the main frame assembly 2, a mid-mounted power module and a rear-mounted power module of the hybrid drive system being installed on the opposite front and rear sides of the rear frame 311, respectively.The power between the mid-mounted power module 312 and the rear-mounted power module 313 is transmitted through the transmission assembly. The mid-mounted power module 312 and / or the rear-mounted power module 313 drive the rear wheel assembly 32 to achieve rotation when the battery is powered, and simultaneously drive the front wheel assembly 1 to achieve synchronous rotation to achieve travel of the electric bicycle.

[0020] The transmission assembly is provided in the rear frame 311, and the transmission assembly includes a chain transmission assembly, a belt transmission assembly, and a shaft transmission assembly, and the center-mounted drive assembly 3122 and the rear-mounted drive assembly are transmittively connected by means of the chain transmission assembly, the belt transmission assembly, and the shaft transmission assembly (gear transmission assembly).

[0021] The front wheel assembly includes a steering assembly and a front wheelset assembly, wherein the steering assembly is fixed to the front end of the main frame assembly, the front wheelset assembly is cooperatively installed on the steering assembly, and the steering assembly drives the front wheelset assembly to rotate synchronously left and right relative to the main frame assembly.

[0022] The steering assembly comprises a steering assembly and a front fork assembly, the steering assembly comprising a handgrip and a handlebar, and the front fork assembly comprising a front fork and a shock absorber assembly, the handlebar being fixedly installed at the front end of the main frame assembly, the handgrip being transversely attached to the handlebar, the front fork being fixedly installed at the lower end of the handlebar, and the shock absorber assembly being provided on the front fork, the hub of the front wheelset assembly being occlusally attached to the front fork, the tire and rim of the front wheelset assembly rotating relative to the hub.

[0023] The main frame assembly includes a frame assembly, a seat lift assembly, and a bracket assembly. The seat lift assembly is installed on top of the frame assembly, and the seat is raised and lowered by telescoping. The bracket assembly is installed on the bottom of the side part of the frame assembly and serves as a support bracket for the electric bicycle. The frame assembly is provided with a rear frame installation hole, a charging module, and a frame compartment module. The rear frame transmission assembly is installed in the rear frame installation hole. The frame compartment module is used for mounting a battery module and a control module, and the charging module is a charging interface for the battery module.

[0024] The lifting seat assembly includes a base, a telescopic rod, a driver's seat and a rotatable fixing block, one end of the base is rotatably connected to the frame assembly by a rotating shaft and the other end fixes the driver's seat, one end of the telescopic rod is connected to the frame assembly and the other end is connected to the base, the telescopic rod, the base and the frame assembly form a triangular structure, the rotatable fixing block is installed on the telescopic rod and locks and fixes the telescopic length of the telescopic rod when the telescopic rod is telescoped to a predetermined length.

[0025] It should be noted that the above embodiment is taken as an example of an electronic bicycle, but it is clear that electronic bicycles equipped with the same type of frame as described above, such as electronic motorcycles, can be constructed.

Claims

[1] Hybrid drive system, characterized by that it includes: a center-mounted power module and a rear-mounted power module; wherein the center-mounted power module comprises a center-mounted module housing, a center-mounted drive assembly, and a foot pedal and a crank, wherein the center-mounted drive assembly is coaxially installed within the center-mounted module housing, wherein the foot pedal and the crank are coaxially connected to the center-mounted drive assembly by an end cap of the center-mounted module housing; wherein the center-mounted drive assembly uses a human drive mode or a human-electric hybrid drive mode, wherein the center-mounted drive assembly of the human drive mode is driven by applying human power to the foot pedal as a power input, while the center-mounted drive assembly of the human-electric hybrid drive mode is driven by applying human power to the foot pedal as a power input, or by a center-mounted motor drive assembly installed in the center-mounted module housing providing a power input. wherein the rear-mounted power module comprises a rear-mounted module housing and a rear-mounted drive assembly, the rear-mounted drive assembly coaxially installed within the rear-mounted module housing, a center-mounted power output end of the center-mounted drive assembly being transmittively connected to the rear-mounted drive assembly by a transmission assembly; wherein the rear-mounted drive assembly comprises a rear-mounted motor drive assembly, the rear-mounted motor drive assembly comprising a downforce state and a drive state, wherein in the downforce state the rear-mounted motor drive assembly passively rotates with power from the center-mounted drive assembly, while in the drive state the rear-mounted motor drive assembly actively rotates, an output power of the rear-mounted motor drive assembly being transmittively connected to a drive wheel through a rear-mounted power output end. [2] Hybrid drive system according to claim 1, characterized bythat the center-mounted drive assembly comprises a center-mounted first-stage drive assembly and a center-mounted second-stage drive assembly which are coaxially installed, wherein the center-mounted first-stage drive assembly comprises a center-mounted center shaft and a first-stage planetary gear set, wherein the center-mounted second-stage drive assembly comprises a hollow sleeve shaft, to each of whose two ends a first-stage sun gear and an output end adapter are attached, and wherein the hollow sleeve shaft is coaxially mounted on an outer side of the center-mounted center shaft, wherein the first-stage sun gear is engaged in the center of the first-stage planetary gear set, wherein a first-stage internal gear ring is attached to an inner wall of the center-mounted module housing, wherein the first-stage planetary gear set cooperatively engages in the first-stage internal gear ring,wherein the foot pedal transmits the applied human power through the crank to the centrally mounted center shaft, wherein the centrally mounted center shaft is capable of driving the first-stage planetary gear set to rotate within a limited range of the first-stage internal gear ring, whereby the output end adapter outputs the power through the transmission of the first-stage sun gear. [3] Hybrid drive system according to claim 2, characterized bythat the centrally mounted drive assembly further comprises a third-stage motor drive assembly, wherein the third-stage motor drive assembly is coaxially mounted on the outside of the hollow sleeve shaft, wherein a second-stage sun gear is provided at an output end of the third-stage motor drive assembly, wherein the centrally mounted second-stage drive assembly further comprises a second-stage planetary gear set cooperatively connected to the hollow sleeve shaft, wherein the centrally mounted module housing is further fixedly connected at the inner wall to a second-stage internal gear ring, wherein the second-stage planetary gear set cooperatively engages the second-stage internal gear ring, wherein the second-stage sun gear cooperatively engages the center of the second-stage planetary gear set, wherein the first-stage sun gear is capable of driving the second-stage planetary gear set in the human drive mode,that it rotates within the limited range of the second-stage internal gear ring, whereby the third-stage motor drive assembly is driven in rotation by the second-stage sun gear to generate electricity, wherein the third-stage motor drive assembly actively rotates in the electric drive mode and is capable of driving the second-stage planetary gear set through the second-stage sun gear to rotate within the limited range of the second-stage internal gear ring, whereby the output end adapter of the hollow sleeve shaft outputs the power. [4] Hybrid drive system according to claim 1, characterized bythat a rear-mounted fastening shaft is installed in the center of the rear-mounted module housing, wherein a rear-mounted internal gear ring is attached to the inner wall of the rear-mounted module housing, wherein the rear-mounted drive assembly comprises a rear-mounted first-stage drive assembly and a rear-mounted second-stage drive assembly, wherein the rear-mounted first-stage drive assembly comprises a brushless hollow-shaft outer rotor motor and a rear-mounted sun gear, wherein the rear-mounted second-stage drive assembly comprises a rear-mounted planetary gear, a rear-mounted planetary frame, a transmission cage, and a drive external gear ring, wherein the brushless hollow-shaft outer rotor motor is coaxially mounted on the outside of the rear-mounted fastening shaft, wherein the rear-mounted sun gear is attached to the output end of the brushless hollow-shaft outer rotor motor,wherein the rear-mounted planetary frame is provided with a drive power input end that cooperates with the center-mounted drive assembly, the rear-mounted sun gear cooperatively meshing with the center of the rear-mounted planetary gear, the rear-mounted planetary gear cooperatively meshing with the rear-mounted internal gear ring and being fixedly connected to one end of the transfer cage by the rear-mounted planetary frame, the drive external gear ring being attached to the other end of the transfer cage by a mounting end cap of the hollow drive external gear ring, the drive external gear ring being cooperatively connected in engagement with a gear of the drive gear, the power of the center-mounted drive assembly being transmitted through the drive power input end to the rear-mounted planetary frame when the rear-mounted motor drive assembly is in the output state,wherein the rear-mounted planetary frame drives the transmission cage and the drive outer gear ring to rotate synchronously and drives the drive gear, wherein the rear-mounted planetary frame drives the rear-mounted planetary gear to rotate within the limited range of the rear-mounted inner gear ring, wherein the rear-mounted planetary gear drives the brushless hollow shaft outer rotor motor through the rear-mounted sun gear to rotate positively to serve as a power generation unit, wherein, when the rear-mounted motor drive assembly is in the drive state, the brushless hollow shaft outer rotor motor rotates positively and drives the rear-mounted planetary gear through the rear-mounted sun gear to rotate within the limited range of the rear-mounted inner gear ring,wherein the rear-mounted planetary gear drives the transmission cage and the drive external gear ring through the rear-mounted planetary frame to rotate synchronously and drives the drive gear to rotate; wherein, when the rear-mounted motor drive assembly is in the positive rotation state, the drive gear rotates positively and drives the drive external gear ring, the transmission cage, and the rear-mounted planetary frame to rotate synchronously; wherein the rear-mounted planetary frame drives the rear-mounted planetary gear to rotate within the limited range of the rear-mounted internal gear ring; and wherein the rear-mounted planetary gear drives the hollow-shaft brushless outer rotor motor through the rear-mounted sun gear to rotate positively to serve as a power generation unit; [5] Hybrid drive system according to claim 2, characterized bythat, while the first-stage planetary gear set drives the first-stage sun gear in rotation, an accelerated rotation is realized by means of a gear ratio of the gear. [6] Hybrid drive system according to claim 3, characterized by that, while the first stage planetary gear set drives the first stage sun gear in rotation, an accelerated rotation is realized by means of a gear ratio, wherein, while the second stage sun gear drives the second stage planetary gear set in rotation, an accelerated rotation is realized by means of a gear ratio, wherein, while the third stage motor drive assembly drives the second stage planetary gear set in rotation through the second stage sun gear, a decelerated rotation is realized by means of a gear ratio.

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