CN216546549U

CN216546549U - Driving part, power assembly and electric bicycle

Info

Publication number: CN216546549U
Application number: CN202123196554.8U
Authority: CN
Inventors: 周佳林; 范清泉; 王洪晓
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2021-12-16
Filing date: 2021-12-16
Publication date: 2022-05-17
Anticipated expiration: 2031-12-16

Abstract

The utility model discloses a driving part, a power assembly and an electric bicycle, wherein the driving part comprises: the middle shaft is sleeved with the shaft sleeve, power is transmitted between the shaft sleeve and the middle shaft in a single-way mode through the first clutch, power is transmitted between the power input part and the shaft sleeve in a single-way mode through the second clutch, manpower and motor power can be input independently and simultaneously, interference between the manpower and the motor power is avoided, and in addition, no transmission system is arranged between the first clutch and the second clutch, invalid transmission and invalid meshing are avoided.

Description

Driving part, power assembly and electric bicycle

Technical Field

The utility model relates to the field of bicycles, in particular to a driving part, a power assembly and a bicycle.

Background

At present, the urban road congestion problem is more and more serious and the concept of ecological protection is more and more advocated, many people begin to turn to the mode of bicycle trip, and the leisure trip mode of bicycle also receives popular favor of wide youth. In order to make traveling more comfortable, convenient and faster, it has become a trend to improve bicycles into electric or power-assisted bicycles.

In the structure of the power assembly of the electric bicycle, the motor is not influenced when the manpower is needed to transmit to the output part, and the manpower is not influenced when the motor power is transmitted to the output part. To achieve this, two overrunning clutches are employed. Currently, most powertrains have two overrunning clutches, one disposed in the driveline and one disposed between the output member and the step shaft. With this structure, although the interference between the manual power and the motor power can be avoided, the gears between the two overrunning clutches are engaged during the manual driving, which not only increases the manual load, but also generates noise. Meanwhile, because an overrunning clutch is arranged in the transmission system, the degree of freedom of design schemes of the transmission system is limited.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solve at least one of the problems of the prior art, and provides a driving member, a power train, and an electric bicycle.

According to an embodiment of the first aspect of the present invention, there is provided a drive member including: the power transmission device comprises a middle shaft, a shaft sleeve, a first clutch, a second clutch and a power input part, wherein the shaft sleeve is sleeved on the middle shaft, the shaft sleeve and the middle shaft transmit power in a single direction through the first clutch, and the power input part and the shaft sleeve transmit power in a single direction through the second clutch.

Has the advantages that: this drive assembly, through setting up first clutch and second clutch, when the axis is driven forward by the manpower and is rotated, first clutch work, the manpower transmits power to the axle sleeve through first clutch, the idle rotation of second clutch this moment, the manpower does not influence power input spare, the axle sleeve exports the manpower, during power input spare forward rotation, second clutch work, power transmits the axle sleeve through the second clutch, first clutch idle rotation this moment, the power of power input spare does not influence the axis, axle sleeve output power, manpower and motor power can be independently input respectively, also can input simultaneously, avoid the interference between manpower and the motor power, and do not have transmission system between first clutch and the second clutch, invalid transmission has been avoided, invalid meshing.

According to the drive component of the embodiment of the first aspect of the present invention, the sleeve includes the first sleeve portion and the second sleeve portion, and the inner diameter of the first sleeve portion is larger than the inner diameter of the second sleeve portion.

According to the driving member of the embodiment of the first aspect of the present invention, the first bearing is disposed between the second bushing portion and the middle shaft.

According to the drive component of the embodiment of the first aspect of the utility model, the first clutch includes an input portion and an output portion, the input portion is connected to the bottom bracket, and the input portion and the first sleeve portion transmit power therebetween in one direction through the output portion.

According to the driving component in the embodiment of the first aspect of the present invention, the connection end of the input portion and the central axis is divided into the connection area and the opening area, the connection area is connected with the central axis, the opening area and the central axis form an open slot, and the end portion of the first shaft sleeve portion extends into the open slot.

According to the drive component of the embodiment of the first aspect of the utility model, the power input member is provided on the second boss portion and is disposed coaxially with the second boss portion.

According to the driving component of the embodiment of the first aspect of the present invention, the second bearing is disposed between the power input member and the second sleeve portion, and the outer wall of the second sleeve portion is provided with the protruding portion for positioning and mounting the second bearing and the second clutch.

According to the drive component of an embodiment of the first aspect of the present invention, the first clutch and the second clutch are both overrunning clutches.

According to the driving unit of the embodiment of the first aspect of the present invention, the overrunning clutch is any one of a sprag type overrunning clutch, a ball type overrunning clutch and a ratchet type overrunning clutch.

According to a second aspect embodiment of the present invention, there is provided a powertrain comprising: the driving component, the motor assembly and the transmission part according to the embodiment of the first aspect, the motor assembly is used for outputting power, the input end of the transmission part is connected with the output end of the motor assembly, and the output end of the transmission part is connected with the power input part.

Has the advantages that: by adopting the driving component of the embodiment of the first aspect, the power assembly can avoid the interference between manpower and motor power on the one hand and has larger freedom degree in the design scheme of the transmission system on the other hand because the first clutch and the second clutch are not arranged in the transmission system.

According to a third aspect embodiment of the present invention, there is provided an electric bicycle including the power assembly of the second aspect embodiment.

Has the advantages that: the electric bicycle adopts the power assembly of the embodiment of the second aspect, so that the interference between manpower and motor power is avoided, and invalid transmission and invalid meshing are avoided.

Drawings

The utility model is further described below with reference to the accompanying drawings and examples;

FIG. 1 is a schematic structural diagram of a driving member according to an embodiment of the present invention;

FIG. 2 is a block diagram of a powertrain according to an embodiment of the present invention;

fig. 3 is a sectional view a-a of fig. 2.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means is one or more, a plurality of means is two or more, and greater than, less than, more than, etc. are understood as excluding the essential numbers, and greater than, less than, etc. are understood as including the essential numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1, a driving part includes: middle shaft 100, shaft sleeve 200, first clutch 310, second clutch 320 and power input 400.

Wherein, the shaft sleeve 200 is sleeved on the middle shaft 100, and the shaft sleeve 200 and the middle shaft 100 rotate coaxially. The shaft sleeve 200 and the central shaft 100 are coaxially and rotatably arranged, and in the embodiment, the coaxial rotation between the shaft sleeve 200 and the central shaft 100 is realized through a first bearing 500.

In one embodiment, the bushing 200 includes a first bushing portion 210 and a second bushing portion 220. The inner diameter of the first bushing portion 210 is not smaller than the inner diameter of the second bushing portion 220, and the inner surface of the first bushing portion 210 and the outer surface of the middle axle 100 are in clearance fit, so that the power input member 400 is ensured not to affect the middle axle 100 and to be arranged coaxially with the middle axle 100 when in operation. A stepped structure is formed between the first boss portion 210 and the second boss portion 220.

The second sleeve portion 220 has an outer diameter larger than that of the first sleeve portion 210, and an inner surface of the first sleeve portion 210 is disposed in a clearance fit with the central shaft 100, so that a gap is formed between the second sleeve portion 220 and the central shaft 100. In order to improve the coaxiality between the bushing 200 and the middle shaft 100 and ensure that the bushing 200 and the middle shaft 100 rotate coaxially, a first bearing 500 is arranged between the second bushing portion 220 and the middle shaft 100, so as to ensure better system stability.

Referring to fig. 1, the first clutch 310 and the second clutch 320 each employ an overrunning clutch. The overrunning clutch is a clutch which is automatically engaged and disengaged by using the rotation speed change or the rotation direction change of a driving part and a driven part, when the driving part drives the driven part to rotate together, the overrunning clutch is called as the combined state of the overrunning clutch, and when the driving part and the driven part are disengaged to rotate at respective speeds, the overrunning clutch is called as the overrunning state.

The shaft sleeve 200 is connected with the middle shaft 100 by the first clutch 310, so that unidirectional power transmission between the shaft sleeve 200 and the middle shaft 100 is realized. The power input member 400 is connected with the shaft sleeve 200 by the second clutch 320, so that unidirectional power transmission between the power input member 400 and the shaft sleeve 200 is realized, and the power input member 400 and the shaft sleeve 200 are coaxially and rotatably arranged.

The first clutch 310 and the second clutch 320 may each employ a special mechanical clutch that is automatically engaged or disengaged by a change in relative speed or a change in rotational direction of the main driven part in the mechanical transmission. The driving member is only able to rotate the driven member from a single direction, and the driven member automatically disengages from transmitting power if the driving member changes direction or the driven member rotates at a higher speed than the driving member.

The overrunning clutch realizes the functions of fast-slow speed conversion and overrunning in a fast feeding machine, realizes the indexing functions of step gap movement and accurate positioning, can be matched with a ball screw or other components for use, prevents reversion and realizes the functions of self locking and non-return.

It is to be understood that the first clutch 310 and the second clutch 320 may each employ a sprag-type overrunning clutch, a roller-type overrunning clutch, and a ratchet-type overrunning clutch.

In the present embodiment, the first clutch 310 is a ratchet type overrunning clutch, and the second clutch 320 is a roller type overrunning clutch. Specifically, the ratchet type overrunning clutch includes a ratchet, a clutch support pin, a clutch spring, a pawl, and a thumb wheel. Under the action of the spring, the front end of the pawl is always upward and embedded in the tooth groove of the ratchet wheel. When power input drives starting, the ratchet wheel starts to rotate under the action of the connecting shaft and drives the pawl to rotate together, the pawl drives the thumb wheel to rotate under the action of the clutch pin, the ratchet wheel type overrunning clutch is in a closing state at the moment, after starting, the thumb wheel and the pawl reach certain rotating speeds, the tail end of the pawl is thrown out under the action of centrifugal force and rotates by taking the small finger of the clutch as a circle center, the front end of the pawl overcomes the elastic force of a clutch spring and then is separated from the bottom of a ratchet groove, the pawl is in a disengaging state, and the ratchet wheel and the thumb wheel rotate at respective rotating speeds without mutual interference.

The second clutch 320 is a roller-type overrunning clutch. The roller type overrunning clutch consists of an inner ring, a roller, an outer ring, a spring, a top pin and the like. Generally, the inner ring is a driving part, and the outer ring is a driven part. When the inner ring rotates forwards, the roller is wedged tightly to drive the outer ring to rotate, and the clutch is engaged. When the inner ring rotates reversely, the roller retreats into the wide groove part, the outer ring is not moved, and the clutch is separated. If the outer ring is driven by another system to rotate in the same direction as the inner ring, the clutch is automatically engaged when the rotating speed of the outer ring is lower than that of the inner ring, and if the rotating speed of the outer ring is higher than that of the inner ring, the clutch is automatically disengaged. The roller overrunning clutch has the advantages that the number of rollers is small, the contact stress of elements is large, the rollers can freely roll in the raceway, the contact points of the rollers and the inner ring and the outer ring are frequently changed, and the abrasion is uniform.

In this embodiment, the first clutch 310 is used as a manual overrunning clutch, the second clutch 320 is used as a motor overrunning clutch, the middle shaft 100 is a pedal shaft, and the shaft sleeve 200 is used as a power output. The shaft sleeve 200 is sleeved on the pedal shaft, the two parts rotate coaxially and are connected through a manual overrunning clutch, the shaft sleeve 200 and the power input part 400 are arranged coaxially, the two parts rotate coaxially and are connected through a motor overrunning clutch, and the coaxiality is ensured by matching and a bearing.

Specifically, when the pedal shaft is driven by manpower to rotate in the forward direction, the manpower overrunning clutch works, the manpower is transmitted to the shaft sleeve 200 through the manpower overrunning clutch, at the moment, the motor overrunning clutch idles, the manpower does not influence the power input part 400, and the manpower is output by the shaft sleeve 200. When the pedal shaft rotates reversely, the manual overrunning clutch idles, and the power shaft sleeve does not have manual input.

When the power input part is driven by the motor power to rotate forward, the motor overrunning clutch works, the motor power is transmitted to the shaft sleeve 200 through the motor overrunning clutch, and at the moment, the manpower overrunning clutch idles, the motor power does not influence the pedal shaft, and the shaft sleeve 200 outputs the power.

Of course, it can be understood that the manpower and the motor power can be input independently, or simultaneously.

The driving part can avoid the interference between manpower and motor power, reduce the manpower burden and reduce the noise, and simultaneously can avoid the invalid meshing in the transmission system and does not influence the freedom degree of the design scheme of the transmission system by setting the positions of the first clutch 310 and the second clutch 320.

Referring to fig. 1, the first clutch 310 includes an input portion 311 and an output portion 312, the input portion 311 is connected to the central shaft 100, and the input portion 311 and the first sleeve portion 210 transmit power therebetween through the output portion 312, thereby achieving one-way power transmission.

Referring to FIG. 1, in one embodiment, the connection end of the input portion 311 to the bottom bracket 100 is divided into a connection area and an opening area. Wherein the attachment area is attached to the medial axis 100. After the input portion 311 is assembled and connected to the bottom bracket 100, an open slot is formed between the open area and the bottom bracket 100, the end of the first sleeve portion 210 can extend into the open slot, and the output portion 312 is disposed between the outer ring of the first sleeve portion 210 and the outer wall of the open area. The output portion 312 may be engaged with an outer wall of the opening region, thereby achieving power transmission.

In which the connection area of the input portion 311 is disposed on the left side and the opening area is disposed on the right side. The connecting area is connected with the middle shaft 100 through splines, a convex part is arranged at the bottom of the input part 311 to form a connecting part, and the other side of the convex part forms a notch. After the input portion 311 is connected by the spline, an open slot opened toward the right is formed between the open area and the middle shaft 100, the first sleeve portion 210 can extend into the open slot, a gap is formed between the outer ring of the first sleeve portion 210 and the outer edge of the open area of the input portion 311, and the output portion 312 is disposed in the gap. When the output part 312 is engaged with the input part 311, the power of the output part 312 is transmitted to the shaft sleeve 200 in one direction. In this way, the first clutch 310 realizes the connection between the input part 311 and the middle shaft 100 and the cooperation between the output part 312 and the middle shaft 100 and the input part 311 through the structural arrangement between the input part 311 and the output part 312, and finally realizes the function of transmitting power to the shaft sleeve 200 in one direction.

In one embodiment, the power input member 400 is disposed on the second sleeve portion 220 and is disposed coaxially with the second sleeve portion 220. Wherein, be provided with second bearing 600 between power input 400 and second sleeve portion 220, guaranteed coaxial axle center rotation through the cooperation between second bearing 600 and the power input 400. The outer wall of the second sleeve portion 220 is provided with a protruding portion 221, and the protruding portion 221 is used for positioning and installing the second bearing 600 and the second clutch 320, so that the installation of the second bearing 600 and the second clutch 320 can be facilitated.

Referring to fig. 2 and 3, according to a second aspect embodiment of the present invention, there is provided a locomotion assembly comprising: the driving member 10, the motor assembly 20 and the transmission portion 30 of the first embodiment, the motor assembly 20 is used for outputting power, the input end of the transmission portion 30 is connected with the output end of the motor assembly 20, and the output end of the transmission portion 30 is connected with the power input member 400. The power assembly can avoid the interference between manpower and motor power, can also avoid invalid meshing in a transmission system, and has less limitation on the degree of freedom of a design scheme of the transmission system.

In some embodiments, the motor assembly 20 includes a stator structure 21, a rotor structure 22, a housing structure 23, and an output shaft 24, the stator structure 21 is disposed in the housing structure 23, the rotor structure 22 is disposed outside the stator structure 21 and connected to the output shaft 24, and the output shaft 24 is connected to an input end of the transmission portion 30. The output shaft 24 is disposed parallel to the middle shaft 100, and the output shaft 24 is connected to the power input member 400 through the transmission portion 30. The transmission unit 30 may be a reduction gear or a transmission gear.

The stator structure is composed of a plurality of segmented core structures and is installed in interference fit with the shell structure 23. Stator structure 21 is pieced together by a plurality of piecemeal iron core subassemblies, and the piecemeal stator is structural to be provided with the flat wire winding, and piecemeal iron core structure and flat wire winding structure can effectively improve the wire winding groove full rate, and the groove full rate is promoted to about 75% by original about 55%, can promote the power density and the performance of motor under the condition that the motor volume does not increase to the duration has been promoted.

Be filled with the resin and glue between stator structure 21 and the shell structure 23, be full of the resin and glue the rigidity that not only can promote the stator structure 21 of motor, reduce power assembly's vibration noise, can also effectively promote the heat dispersion of motor, prevent that the motor from causing efficiency to descend because of the high temperature. The resin material is a high molecular resin material. Preferably a thermosetting resin material, and is relatively more capable of improving rigidity and heat conduction performance.

Motor element 20 still includes the busbar structure, and the structural boss seat that sets up one of busbar and shell structure 23 line hole complex of crossing of this boss seat not only can prevent that the resin from gluing oozing to can also fix stator winding's three-phase power source terminal, be favorable to the location of power supply terminal, and with automatically controlled board to inserting the installation. The busbar structure includes multilayer copper bar structure, and the copper bar structure is equipped with the copper bar terminal that appears the first connection with the winding, including at least one copper bar structure of bending in the multilayer copper bar, and this bending structure has at least one "Z" style of calligraphy bending structure characteristic on axial space, can make the copper bar of bending stride more two-layerly on axial space, but make full use of other copper bar layers idle space, reduce the number of piles of copper bar.

This power assembly includes: the drive unit 10, the motor assembly 20 and the transmission 30, the motor assembly 20 comprises a stator structure 21, a rotor structure 22, a housing structure 23 and an output shaft 24.

Wherein, stator structure 21 includes a plurality of piecemeal iron cores, it has flat wire winding or square conductor winding to adopt, improve winding slot fullness rate and motor power density, it is fixed to be interference connection between stator structure 21 and the shell structure 23, and it is full of the resin glue to fill between shell structure 23 and stator structure 21, effectively promote stator assembly rigidity and stator winding's thermal conductivity, reduce the vibration noise of power assembly and promote the heat dispersion of motor, the copper bar of busbar structure adopts Z type structure, the axial height of stator assembly has been reduced, thereby the volume of motor has been reduced.

An electric bicycle according to an embodiment of the third aspect of the present invention includes the power unit of the embodiment of the second aspect.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. A drive member, comprising:

a middle shaft;

the shaft sleeve is sleeved on the middle shaft;

a power input;

the shaft sleeve and the middle shaft transmit power in a single direction through the first clutch; and

and the power is transmitted between the power input part and the shaft sleeve in a one-way mode through the second clutch.

2. The drive component of claim 1, wherein: the shaft sleeve comprises a first shaft sleeve part and a second shaft sleeve part, and the inner diameter of the first shaft sleeve part is larger than that of the second shaft sleeve part.

3. The drive component of claim 2, wherein: a first bearing is arranged between the second shaft sleeve part and the middle shaft.

4. The drive component of claim 2, wherein: the first clutch comprises an input part and an output part, the input part is connected with the middle shaft, and the input part and the first shaft sleeve part transmit power in one direction through the output part.

5. The drive component of claim 4, wherein: the input part and the connecting end of the middle shaft are divided into a connecting area and an opening area, the connecting area is connected with the middle shaft, the opening area and the middle shaft form an open slot, and the end part of the first shaft sleeve part extends into the open slot.

6. The drive component of claim 2, wherein: the power input part is arranged on the second shaft sleeve part and is coaxially arranged with the second shaft sleeve part.

7. The drive component of claim 6, wherein: the power input part and the second shaft sleeve part are provided with a second bearing therebetween, the outer wall of the second shaft sleeve part is provided with a protruding part, and the protruding part is used for positioning and mounting the second bearing and the second clutch.

8. The drive component of any one of claims 1 to 7, wherein: the first clutch and the second clutch are both overrunning clutches.

9. A powertrain, comprising:

a drive component according to any one of claims 1 to 8;

the motor assembly is used for outputting power;

the input end of the transmission part is connected with the output end of the motor assembly, and the output end of the transmission part is connected with the power input piece.

10. Electric bicycle, its characterized in that includes: the locomotion assembly of claim 9.