CN106904243B

CN106904243B - Electric bicycle transmission device and electric bicycle with same

Info

Publication number: CN106904243B
Application number: CN201710260815.7A
Authority: CN
Inventors: 李纪召; 沈建明; 倪敏健; 许建明
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-04-20
Filing date: 2017-04-20
Publication date: 2022-08-30
Anticipated expiration: 2037-04-20
Also published as: CN106904243A

Abstract

The application discloses electric bicycle transmission includes: the middle shaft, the sealing ring, the check ring, the Hall assembly and the locking end cover are sequentially distributed from inside to outside along the axis direction of the middle shaft and are movably sleeved outside the middle shaft; the locking end cover is fixedly locked with the front driving shell through threads, so that the sealing ring, the check ring and the Hall assembly are fixedly pressed between the locking end cover and the front driving shell; and the middle shaft is fixedly provided with speed induction magnetic steel corresponding to the Hall assembly. The application scope is wide, can enough guarantee the stable transmission of axis and vehicle rear wheel, has avoided traditional chain formula transmission to break easily when using again and has damaged, the accidental injury user, stained user's clothing, the problem that needs frequent maintenance.

Description

Electric bicycle transmission device and electric bicycle with same

Technical Field

The application relates to the field of electric bicycles, in particular to an electric bicycle transmission device and an electric bicycle with the same.

Background

The transmission device of the existing electric bicycle is a chain type transmission, for example, the electric bicycle carrying a rear-drive hub motor, wherein a shaft and the rear-drive hub motor are connected by a chain (and a chain wheel) in a transmission way, two ends of the shaft are connected with a crank, and the end part of the crank is connected with a pedal. In practical application, in an electric mode, the rear-drive hub motor is electrified to operate to directly drive the rear wheel to rotate, so that the vehicle moves forwards; under the manpower mode of riding, the person of riding tramples on the pedal, and drives the axis rotation through the crank, and the axis is driving the shell rotation of in-wheel motor through the chain, and motor housing drives the bicycle rear wheel and rotates and make the vehicle move ahead.

The chain transmission of the type described above has the following disadvantages: the transmission chain is easy to break and damage, and is easy to accidentally injure a user, and meanwhile, the clothes of the user are easy to stain and require frequent maintenance.

Disclosure of Invention

The purpose of the application is: to overcome the above problems, an electric bicycle transmission device and an electric bicycle provided with the same are provided in a more compact structure.

The technical scheme of the application is as follows: an electric bicycle transmission for drivingly connecting a crank of an electric bicycle to a rear drive hub motor, comprising:

a middle shaft which is pivotally connected to the frame and two ends of which are used for connecting the crank,

a first bevel gear coaxially fixed on the middle shaft,

a second bevel gear for connecting the rear-drive hub motor,

a third bevel gear in meshed connection with the first bevel gear,

a fourth bevel gear in meshed connection with the second bevel gear,

a drive shaft fixedly connected between the third bevel gear and the fourth bevel gear, and the drive shaft, the third bevel gear and the fourth bevel gear are coaxially arranged, an

The transmission shaft is rotatably arranged in the shaft sleeve through a support bearing;

the axle sleeve is composed of a front driving shell, a front connecting seat, a sleeve, a rear connecting seat and a rear driving shell which are detachably connected from front to rear in sequence, and the front driving shell and the rear driving shell are fixed with the frame;

the frame comprises a bottom fork, a five-way pipe connected to the front part of the bottom fork and a rear hook claw connected to the rear part of the bottom fork, the front driving shell is arranged in the five-way pipe in a penetrating mode and locked and fixed, and the middle shaft is rotatably assembled in the front driving shell through a middle shaft supporting bearing;

the locking device also comprises a sealing ring, a check ring, a Hall assembly and a locking end cover which are sequentially distributed from inside to outside along the axis direction of the middle shaft and are movably sleeved outside the middle shaft; the locking end cover is fixedly locked with the front driving shell through threads, so that the sealing ring, the check ring and the Hall assembly are fixedly pressed between the locking end cover and the front driving shell; and the middle shaft is fixedly provided with speed induction magnetic steel corresponding to the Hall assembly.

On the basis of the technical scheme, the application also comprises the following preferable scheme:

the retainer ring is in threaded connection with the front drive housing, so that the seal ring is tightly pressed and fixed between the retainer ring and the front drive housing.

The Hall assembly and the check ring are circumferentially clamped and embedded and fixed.

And a hub sleeving hole which axially extends inwards and is matched with a hub fixed on a motor shell of the rear-drive hub motor is formed in one axial side of the second bevel gear.

And the rear driving shell and the second bevel gear are provided with supporting bearings.

The sleeve is connected with the front connecting seat through an external thread arranged on the outer tube wall at the front end of the sleeve and an internal thread arranged in the front connecting seat, the sleeve is connected with the rear connecting seat through an external thread arranged on the outer tube wall at the rear end of the sleeve and an internal thread arranged in the rear connecting seat, and the external thread on the outer tube wall at the front end of the sleeve is opposite to the external thread on the outer tube wall at the rear end of the sleeve in the rotating direction.

The electric bicycle comprises a frame and an electric bicycle transmission device with the structure.

The application has the advantages that:

1. the electric bicycle is provided with the chainless shaft transmission device to connect the middle shaft of the electric bicycle with the rear-drive hub motor, and the middle shaft speed sensor is skillfully arranged at the middle shaft so as to control the output power of the motor in a mode of sensing the rotating speed of the middle shaft, so that a rider can regulate the output power of the motor by treading the crank.

2. One axial side of the second bevel gear is provided with a hub sleeve hole extending axially inwards, and the hub connecting hole is circumferentially and fixedly sleeved outside a hub of the rear-drive hub motor, so that the second bevel gear is connected with the rear-drive hub motor. The structure and the size of the hub sleeve hole arranged on the second bevel gear are completely matched with those of a hub sold on the market, so that the transmission device is suitable for connecting various rear-drive hub motors, and the application range of the transmission device is greatly improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an electric bicycle transmission according to an embodiment of the present application;

FIG. 2 is an enlarged view of a portion of FIG. 1;

wherein: 1-frame, 101-bottom fork, 102-five-way pipe, 103-rear claw, 2-middle shaft, 301-motor spindle, 302-motor shell, 303-hub, 4-first bevel gear, 5-second bevel gear, 501-hub sleeve hole, 6-third bevel gear, 7-fourth bevel gear, 8-transmission shaft, 9-support bearing, 10-front drive shell, 11-front connecting seat, 12-sleeve pipe, 13-rear connecting seat, 14-rear drive shell, 15-middle shaft support bearing, 16-sealing ring, 17-retainer ring, 18-Hall component, 19-locking end cover and 20-speed induction magnetic steel.

Detailed Description

The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present application. The conditions used in the examples may be further adjusted according to the conditions of the particular manufacturer, and the conditions not specified are generally the conditions in routine experiments.

Fig. 1 and 2 show a specific embodiment of the transmission device for an electric bicycle of the present application, which is used to connect a crank of the electric bicycle and a rear-drive hub motor, so that a rider can drive the crank to rotate by pedaling, and then transmit the rotation of the crank to a motor case of the rear-drive hub motor, and then drive a rear wheel of the bicycle fixed to the motor case to rotate, so that the bicycle moves forward.

In fig. 1, the rear-drive hub motor is a commonly used rear-drive hub motor without exception, and includes: the frame comprises a motor shell 302, a motor spindle 301 which is rotatably arranged in the motor shell in a penetrating mode and fixed on the frame 1, and a hub 303 which is rotatably sleeved outside the motor spindle 301 and connected with the motor shell 302. The motor housing 302 is composed of a housing 302a and an end cover 302b which are fastened together by bolts, and the movement portion of the motor is provided in the motor housing 302. The hub 303 has a one-way clutch function, and the hub 303 is commercially available assembled to a motor, which is a standard component. In which the motor housing 302 is fixed to the rear wheel of the bicycle and in most cases it is normally used directly as the hub of the rear wheel.

In the conventional chain transmission structure, the hub 303 is usually connected to a rear sprocket, the rear sprocket is connected to a front chain wheel fixed to a center shaft of the bicycle through a chain, and a rider pedals the bicycle in a forward direction to drive a crank to rotate, and then the bicycle drives a rear wheel of the bicycle to rotate through the front chain wheel, the chain, the hub and a motor housing, so that the bicycle moves forward. When the rider treads the crank reversely, the hub is in a separated state, and the shell of the motor is not subjected to the action of torsional force.

As in the case of the previous solution devised by the applicant, the transmission also comprises: a middle shaft 2, a first bevel gear 4, a second bevel gear 5 and a transmission shaft 8. Wherein:

the bottom bracket 2 is rotatably connected (indirectly connected through an intermediate member, not directly connected) to the frame 1 of the electric bicycle. In practical application, two ends of the middle shaft 2 are connected with a crank, and the end part of the crank is provided with a pedal. The rear-drive hub motor 3 is mounted on the frame 1 and is located behind the bottom bracket 2.

The first bevel gear 4 is coaxially fixed on the middle shaft 2, and the first bevel gear and the middle shaft can be of a split structure or an integrated structure.

The second bevel gear 5 is coaxially sleeved outside the motor spindle 301 and can rotate around the motor spindle 301, and the second bevel gear 5 is connected with a rear-drive hub motor.

The third bevel gear 6 is in meshing connection with the first bevel gear 4, and the fourth bevel gear 7 is in meshing connection with the second bevel gear 5.

The transmission shaft 8 is fixedly connected between the third bevel gear 6 and the fourth bevel gear 7, and the transmission shaft 8 is coaxially arranged with the third bevel gear 6 and the fourth bevel gear 7, i.e. the three are coaxially arranged and fixed to each other.

The key improvement of this embodiment is that the connection mode of the second bevel gear 5 and the rear-drive hub motor is as follows: one axial side of the second bevel gear 5 is provided with a hub sleeving hole 501 (the aperture of the hub sleeving hole 501 is several times of the diameter of the motor spindle) extending axially inwards, and the hub connecting hole 501 is circumferentially and fixedly sleeved outside the hub 303. Therefore, the one-way locking connection of the second bevel gear 5 and the motor shell is realized by the self-provided hub on the motor shell, and a one-way clutch with a special structure is not required to be additionally arranged.

When the transmission device is manufactured, the structure and the size of the hub sleeving hole 501 are designed according to the structure and the size of a standard hub sold in the market, so that the structure and the size are completely matched. Therefore, the transmission device is suitable for being connected with various rear-drive hub motors, and the application range of the transmission device is greatly improved.

In practical application, two ends of the middle shaft 2 are connected with cranks, pedals are arranged on the cranks, and a motor shell of the rear-drive hub motor (as a hub of a rear wheel of a vehicle) is coaxially connected with the rear wheel of the vehicle. The rider treads the pedal forward and drives axis 2 through the crank and rotate, and axis 2 loops through the transmission of above-mentioned first conical gear 4, third conical gear 6, transmission shaft 8, fourth conical gear 7 and second conical gear 5 again and drives flower-drum 303 and rotate, and flower-drum 303 is in the locking state this moment, and it drives motor housing and rotates, and then the bicycle rear wheel rotates, realizes that the bicycle moves ahead. In the electric mode, the rear-drive hub motor is powered on to operate, the motor shell is driven by the movement to rotate around the motor spindle, and the hub 303 is in a loose state and cannot drive the second bevel gear 5 and the central shaft 2 to rotate.

In order to guarantee the structural stability of the chain-free transmission mechanism and avoid the potential safety hazard existing in the situation that the transmission shaft 8 is directly exposed, the embodiment is also provided with a shaft sleeve connected to the frame 1, and the transmission shaft 8 is rotatably arranged in the shaft sleeve through a supporting bearing 9.

In the present embodiment, the shaft sleeve is not an integral structure, but is composed of a front driving housing 10, a front connecting seat 11, a sleeve 12, a rear connecting seat 13 and a rear driving housing 14, which are detachably connected from front to rear, wherein the front driving housing 10 and the rear driving housing 14 are fixed to the frame 1, the front connecting seat 11, the sleeve 12 and the rear connecting seat 13 are separated from the frame 1 by the front driving housing 10 and the rear driving housing 14, and the front connecting seat 11, the sleeve 12 and the rear connecting seat 13 are not directly connected to the frame 1. The shaft sleeve adopts the split connection type structure, and is mainly used for assembling parts on a chainless transmission mechanism.

Further, the detachable connection mode among the front connection seat 11, the sleeve 12 and the rear connection seat 13 is a threaded connection, specifically: sleeve 12 and preceding connecting seat 11 are through locating the external screw thread on the outer pipe wall of sleeve 12 front end with locate the internal thread cooperation connection in preceding connecting seat 11, sleeve 12 and back connecting seat 13 through locating the external screw thread on the outer pipe wall of sleeve 12 rear end with locate the internal thread cooperation connection in back connecting seat 13. And, the external screw thread on the outer pipe wall of front end on the sleeve 12 is opposite to the external screw thread on the outer pipe wall of rear end on the sleeve 12, like this, only need to rotate sleeve 12, can make front connecting seat 11 and back connecting seat 13 close to each other/keep away from each other, so can make this chainless drive mechanism adjust the length of the axle sleeve after assembling to the frame in a small scale.

A support bearing 9 is also provided between the rear drive housing 14 and the second bevel gear 5 to ensure stability of the assembly position of the two.

A transversely through center shaft mounting hole is formed in the front driving housing 10, and the center shaft 2 is rotatably inserted through the center shaft mounting hole through a center shaft support bearing 15.

The same as the conventional electric bicycle frame, the frame 1 in fig. 1 also includes a bottom fork 101 of the vehicle, a five-way tube 102 connected to the front part of the bottom fork, and a rear hook 103 connected to the rear part of the bottom fork, wherein the front driving housing 10 is inserted into the five-way tube 102 and locked and fixed to the five-way tube 102, and the motor spindle 301 is locked and fixed to the rear hook 103.

In addition, a middle shaft speed sensor is further arranged at the middle shaft 2 and is in circuit connection with the rear-drive hub motor through a circuit. In practical application, the middle shaft speed sensor can sense the rotating speed of the middle shaft 2 and adjust the output power of the rear-drive hub motor according to the sensed rotating speed of the middle shaft.

Specifically, in this embodiment, the bottom bracket speed sensor adopts the following structure and assembly form:

the present embodiment further includes a seal ring 16, a retainer ring 17, a hall assembly 18, and a locking end cover 19 that are sequentially distributed from inside to outside along the axis direction of the center shaft 2 and are all movably sleeved outside the center shaft 2. The locking end cover 19 is screwed and fixed with the movable housing 10, so that the sealing ring 16, the retainer ring 17 and the Hall assembly 18 are tightly pressed and fixed between the locking end cover 19 and the front drive housing 10. The speed induction magnetic steel 20 corresponding to the Hall component 18 is fixedly arranged on the middle shaft 2. The hall element 18 and the corresponding speed sensing magnetic steel 20 form the central shaft speed sensor.

In practical application, when a rider treads a crank to enable the middle shaft 2 to rotate, the speed sensing magnetic steel 20 rotates synchronously with the middle shaft 2, a surrounding magnetic field changes, the Hall assembly 18 senses the change of the magnetic field to know the rotating speed of the middle shaft, the Hall assembly 18 transmits a magnetic change signal to a controller of the rear-drive hub motor, and the controller adjusts the output power of the rear-drive hub motor according to the magnetic change signal.

In order to enhance the stability of the assembled position of the seal ring 16, the retainer ring 17 and the front drive housing 10, the present embodiment threadedly engages the retainer ring 17 with the front drive housing 10, thereby compressively fixing the seal ring 16 between the retainer ring 17 and the front drive housing 10. The hall assembly 18 is fixed with the retainer ring 17 in a circumferential embedded manner.

During assembly, the sealing ring 16 is firstly installed, and the retainer ring 17 is screwed to tightly press and fix the sealing ring 16. Then, the Hall assembly 18 is embedded on the retainer ring 17, and the locking end cover 19 is locked to axially press the Hall assembly 18.

Furthermore, the front driving housing 10 and the five-way tube 102 are also fixed together by means of a locking end cap 19, and the locking end cap 19 is tightly pressed on the end of the five-way tube (the end of the five-way tube is provided with an adjusting nut tightly matched with the locking end cap 19, which is not marked in the figure).

The above embodiments are only for illustrating the technical concepts and features of the present application, and the purpose of the embodiments is to enable people to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the main technical scheme of the application are covered in the protection scope of the application.

Claims

1. An electric bicycle transmission for drivingly connecting a crank of an electric bicycle to a rear drive hub motor, comprising:

a middle shaft (2) which is pivotally connected to the frame (1) and two ends of which are used for connecting the crank,

a first bevel gear (4) coaxially fixed on the middle shaft (2),

a second bevel gear (5) for connecting the rear-drive hub motor,

a third bevel gear (6) in meshed connection with the first bevel gear (4),

a fourth bevel gear (7) in meshed connection with the second bevel gear (5),

a drive shaft (8) fixedly connected between the third and fourth bevel gears, and the drive shaft (8), the third bevel gear (6) and the fourth bevel gear (7) are arranged coaxially, an

The transmission shaft (8) is rotatably arranged in the shaft sleeve through a supporting bearing (9);

the axle sleeve is composed of a front driving shell (10), a front connecting seat (11), a sleeve (12), a rear connecting seat (13) and a rear driving shell (14) which are detachably connected from front to rear in sequence, and the front driving shell (10) and the rear driving shell (14) are fixed with the frame (1);

the frame (1) comprises a bottom fork (101), a five-way pipe (102) connected to the front part of the bottom fork and a rear hook claw (103) connected to the rear part of the bottom fork, the front driving shell (10) penetrates through the five-way pipe (102) and is locked and fixed, and the middle shaft (2) is rotatably assembled in the front driving shell (10) through a middle shaft support bearing (15);

the novel bearing is characterized by further comprising a sealing ring (16), a check ring (17), a Hall assembly (18) and a locking end cover (19), wherein the sealing ring, the check ring (17), the Hall assembly (18) and the locking end cover are sequentially distributed from inside to outside along the axis direction of the middle shaft (2) and are movably sleeved outside the middle shaft (2); the locking end cover (19) is fixedly locked with the front driving shell (10) through threads, so that the sealing ring (16), the check ring (17) and the Hall assembly (18) are pressed and fixed between the locking end cover (19) and the front driving shell (10); a speed induction magnetic steel (20) corresponding to the Hall assembly (18) is fixedly arranged on the middle shaft (2);

the check ring (17) is in threaded connection with the front drive shell (10), so that the sealing ring (16) is pressed and fixed between the check ring (17) and the front drive shell (10);

the Hall assembly (18) and the retainer ring (17) are circumferentially clamped and embedded and fixed;

the rear driving shell (14) and the second bevel gear (5) are provided with a supporting bearing (9).

2. The transmission device of the electric bicycle as claimed in claim 1, wherein one axial side of the second bevel gear (5) is provided with a hub engaging hole (501) extending axially inward and matching with a hub (303) fixed on a motor housing (302) of the rear-drive hub motor.

3. The transmission device of the electric bicycle according to claim 1, wherein the sleeve (12) is connected with the front connecting seat (11) through an external thread arranged on the outer tube wall of the front end of the sleeve (12) and an internal thread arranged in the front connecting seat (11), the sleeve (12) is connected with the rear connecting seat (13) through an external thread arranged on the outer tube wall of the rear end of the sleeve (12) and an internal thread arranged in the rear connecting seat (13), and the external thread on the outer tube wall of the front end of the sleeve (12) is opposite to the external thread on the outer tube wall of the rear end of the sleeve (12).

4. An electric bicycle comprising a frame (1), characterized in that it further comprises an electric bicycle transmission according to any one of claims 1 to 3.