阅读说明：本技术 一种助力自行车的中置驱动机构 (Middle driving mechanism of power-assisted bicycle ) 是由 黄福明 黄俊宁 马诚 蔡华林 于 2020-04-17 设计创作，主要内容包括：本发明提供一种助力自行车的中置驱动机构,包括壳体、电机、受电机驱动的驱动锥齿轮、与驱动锥齿轮啮合的从动锥齿轮、与从动锥齿轮连接的牙盘支座以及穿过从动锥齿轮及牙盘支座的中轴组件,还包括：支撑延座,支撑延座与从动锥齿轮同轴连接；支撑延座延伸至从动锥齿轮远离牙盘支座的另一侧；支撑结构,用于支撑从动锥齿轮,包括设置于从动锥齿轮远离牙盘支座的另一侧的第一支撑件,和靠近牙盘支座一侧的第二支撑件；第一支撑件设置在支撑延座远离从动锥齿轮的端部。所述助力自行车的中置驱动机构对从动锥齿轮支撑的稳定性好,能够有效防止从动锥齿轮出现偏摆现象,能够有效延长使用寿命。(The invention provides a middle driving mechanism of a power-assisted bicycle, which comprises a shell, a motor, a driving bevel gear driven by the motor, a driven bevel gear meshed with the driving bevel gear, a chain wheel support connected with the driven bevel gear, and a middle shaft assembly penetrating through the driven bevel gear and the chain wheel support, and further comprises: the supporting extension seat is coaxially connected with the driven bevel gear; the supporting extension seat extends to the other side of the driven bevel gear, which is far away from the chain wheel support; the supporting structure is used for supporting the driven bevel gear and comprises a first supporting piece and a second supporting piece, wherein the first supporting piece is arranged on the other side, far away from the chain wheel support, of the driven bevel gear, and the second supporting piece is close to one side of the chain wheel support; the first supporting piece is arranged at the end part of the supporting extension seat far away from the driven bevel gear. The middle driving mechanism of the power-assisted bicycle has good stability for supporting the driven bevel gear, can effectively prevent the driven bevel gear from deflecting, and can effectively prolong the service life.)

1. The utility model provides a put actuating mechanism in moped, includes casing, motor, receives motor drive's drive bevel gear, with the driven bevel gear of drive bevel gear meshing, the chain wheel support of being connected with driven bevel gear and pass the axis subassembly of driven bevel gear and chain wheel support, its characterized in that still includes:

the supporting extension seat is coaxially connected with the driven bevel gear;

the supporting extension seat extends to the other side, away from the chain wheel support, of the driven bevel gear;

the supporting structure is used for supporting the driven bevel gear and comprises a first supporting piece and a second supporting piece, wherein the first supporting piece is arranged on the other side, far away from the chain wheel support, of the driven bevel gear, and the second supporting piece is close to one side of the chain wheel support;

the first supporting piece is arranged at the end part of the supporting extension seat far away from the driven bevel gear.

2. The middle-mounted driving mechanism of an assisted bicycle according to claim 1, wherein the supporting extension seat is sleeve-shaped and coaxially sleeved on the middle shaft assembly, and the outer wall of the supporting extension seat is fixedly connected with the inner wall of the driven bevel gear.

3. The center drive mechanism for a power-assisted bicycle according to claim 2, wherein the first support member is mounted on the side of the support holder and has a shoulder protruding from the side of the support holder, and the shoulder is engaged with the housing to fix the first support member in an axial direction.

4. The center drive mechanism for a power-assisted bicycle according to claim 2, wherein the second support member is provided on the crankset support; the position of the second supporting piece is provided with a blocking shoulder, the blocking shoulder protrudes out of the side face of the chain wheel support, is matched with the shell and is fixed along the axis direction in a limiting manner on the second supporting piece.

5. The center drive mechanism for a power-assisted bicycle according to claim 4, wherein a fixing cover is disposed at an end of the second support member away from the blocking shoulder, the fixing cover surrounds the chain wheel support, the fixing cover is in threaded connection with the housing, and the blocking shoulder and the fixing cover limit and fix the second support member in an axial direction.

6. The center drive mechanism for a power-assisted bicycle of claim 1, wherein an outer diameter of the first support is smaller than an outer diameter of the second support.

7. The center drive mechanism of a power-assisted bicycle according to claim 1, wherein the driven bevel gear is integrally formed with the chain wheel support.

8. The center drive mechanism for a power-assisted bicycle according to claim 1, wherein the support bracket is integrally formed with the crankset bracket.

9. The center drive mechanism for a power-assisted bicycle according to claim 8, wherein the second support member is provided on the crankset support.

10. A method of assembling a center drive mechanism of a power-assisted bicycle for assembling the center drive mechanism of the power-assisted bicycle according to any one of claims 1 to 9, comprising the steps of:

(A) the supporting extension seat, the chain wheel support and the driven bevel gear are fixedly connected to form an integral assembly structure;

(B) and processing the installation parts of the first supporting piece and the second supporting piece at the two ends of the assembly structure.

Technical Field

The invention relates to the technical field of speed reducing mechanism assembly, in particular to a middle driving mechanism of a power-assisted bicycle.

Background

In the prior art, a power-assisted bicycle generally adopts a middle driving mechanism, the middle driving mechanism usually comprises a motor and a planetary gear in transmission connection with the motor, the output end of the planetary gear is connected with a driving bevel gear, the driving bevel gear is meshed with a driven bevel gear to form secondary speed reduction, finally, the driven bevel gear is connected with a chain wheel support, and the driving chain wheel rotates so as to provide power assistance for the power-assisted bicycle. In the middle-mounted driving mechanism in the prior art, a driven bevel gear is generally supported and positioned at a meshing position close to one side of a chain wheel by a bearing, the structure is a cantilever structure, and the condition that the bearing and the bevel gear are out of work can occur after the driving mechanism runs for a long time or when the load is large.

Concretely, driven bevel gear one side cantilever support, driven bevel gear is connected with the chain wheel support simultaneously, and usable space is limited, and the position that can form the support is also very little, and driven bevel gear atress is very big, leads to unilateral bearing structure to accomplish hardly to provide sufficient stable support for driven bevel gear. When the middle-arranged driving mechanism operates, the cantilever end of the driven bevel gear is easy to deflect, so that the meshing part of the driving bevel gear and the driven bevel gear is damaged, the positioning bearing is also stressed to be damaged and lose efficacy, and further the middle-arranged driving mechanism is damaged, the service life is shortened, and even the stable operation cannot be realized.

Therefore, there is a need in the art for an improved middle-mounted driving mechanism of a power-assisted bicycle, so as to improve the operation stability and prolong the service life of the middle-mounted driving mechanism.

Disclosure of Invention

In view of this, the main objective of the present invention is to provide a middle driving mechanism for a power-assisted bicycle, in which a supporting extension seat is provided, the supporting extension seat is connected with a driven bevel gear and a chain wheel support to form an assembly structure, two ends of the assembly structure are respectively connected with a housing through coaxial bearings to form two ends of the driven bevel gear to be supported, so as to improve the stability of the supporting structure.

In order to achieve the above object, the present invention provides a middle driving mechanism for a power-assisted bicycle, including a housing, a motor, a driving bevel gear driven by the motor, a driven bevel gear engaged with the driving bevel gear, a chain wheel support connected to the driven bevel gear, and a middle shaft assembly passing through the driven bevel gear and the chain wheel support, further including:

the supporting extension seat is coaxially connected with the driven bevel gear;

the supporting extension seat extends to the other side, away from the chain wheel support, of the driven bevel gear;

the supporting structure is used for supporting the driven bevel gear and comprises a first supporting piece and a second supporting piece, wherein the first supporting piece is arranged on the other side, far away from the chain wheel support, of the driven bevel gear, and the second supporting piece is close to one side of the chain wheel support;

the first supporting piece is arranged at the end part of the supporting extension seat far away from the driven bevel gear.

Preferably, the support extension seat is sleeve-shaped and coaxially sleeved on the middle shaft assembly, and the outer wall of the support extension seat is fixedly connected with the inner wall of the driven bevel gear.

Preferably, a shoulder is arranged at the position where the first supporting part is installed at the side part of the supporting extension seat, the shoulder protrudes out of the side surface of the supporting extension seat, is matched with the shell, and is used for limiting and fixing the first supporting part along the axis direction.

Preferably, the second support is disposed on the crankset mount; the position of the second supporting piece is provided with a blocking shoulder, the blocking shoulder protrudes out of the side face of the chain wheel support, is matched with the shell and is fixed along the axis direction in a limiting manner on the second supporting piece.

Preferably, the second support piece is far away from the one end of keeping off the shoulder sets up fixed lid, fixed lid encircles the chain wheel support, just fixed lid with casing threaded connection, keep off the shoulder with fixed lid is along the spacing fixed of axis direction second support piece.

Preferably, the outer diameter of the first support is smaller than the outer diameter of the second support.

Preferably, the first and second supports are bearings.

Preferably, the driven bevel gear is integrally formed with the crankset support.

Preferably, the support extension seat and the crankset support are integrally formed.

Preferably, the second support is provided on the crankset mount.

The invention also provides an assembly method of the middle driving mechanism of the power-assisted bicycle, which is used for assembling the middle driving mechanism of the power-assisted bicycle and comprises the following steps:

(A) the supporting extension seat, the chain wheel support and the driven bevel gear are fixedly connected to form an integral assembly structure;

(B) and processing the installation parts of the first supporting piece and the second supporting piece at the two ends of the assembly structure.

Compared with the prior art, the middle driving mechanism of the power-assisted bicycle disclosed by the invention has the advantages that: prolong the seat through setting up the support and be connected with driven bevel gear, chain wheel support to set up the bearing at both ends and be connected with the casing, improve bearing structure's stability, can effectively prevent driven bevel gear deflection phenomenon from appearing, improved stability, prolonged life.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic cross-sectional view of a mid-drive mechanism of a power-assisted bicycle according to the present invention.

Fig. 2 is a schematic view of the mounting structure of the driven bevel gear, the chain wheel support and the support extension seat.

Fig. 3 is a schematic view of a connection structure of the planetary gear output carrier and the bevel gear support.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the present application relates to a middle driving mechanism of a power-assisted bicycle, which includes a housing 1, a motor 2, a planetary gear 4, a planetary gear output support 5, a bevel gear support 8, a driving bevel gear 9, a driven bevel gear 10, a support extension support 12, a chain wheel support 11, a supporting structure and a middle shaft assembly 16; the planetary gear 4 is in transmission connection with the motor 2, the planetary gear output support 5 is in coaxial connection with the planetary gear 4, the bevel gear support 8 is in coaxial connection with the planetary gear output support 5, the driving bevel gear 9 is in coaxial connection with the bevel gear support 8, the driven bevel gear 10 is meshed with the driving bevel gear 9, the driven bevel gear 10 is in surrounding connection with the supporting extension seat 12 and the chain wheel support 11, and the supporting extension seat 12 and the chain wheel support 11 are in surrounding connection with the middle shaft assembly 16; the supporting structure comprises a first supporting piece 14 and a second supporting piece 13, the exterior of the crankset support 11 is connected with the second supporting piece 13 in a surrounding manner, the end part of the support extension base 12 far away from the crankset support 11 is connected with the first supporting piece 14 in a surrounding manner, and the second supporting piece 13 and the first supporting piece 14 are respectively positioned at two sides of the driven bevel gear 10 and are installed inside the shell 1. The second supporting member 13 and the first supporting member 14 form two supporting members to form a supporting structure for both ends of the driven bevel gear 10, and have good supporting stability, reliable operation and less possibility of damaging parts. The second support 13 and the first support 14 are preferably bearings.

Preferably, the driven bevel gear 10 may be formed integrally with the crankset support 11 to improve the coaxiality and the bonding strength of the two parts. The support extending seat 12 and the chain wheel support 11 can be further arranged to be integrally formed, and the two supporting pieces are respectively connected with the support extending seat 12 and the chain wheel support 11 so as to improve the coaxiality of the two supporting parts.

Specifically, referring to fig. 2, the supporting holder 12 is in a sleeve shape and has a first cylinder 121 and a second cylinder 122 with different cylinder diameters, and the cylinder diameter of the second cylinder 122 is larger than that of the first cylinder 121. The middle shaft assembly 16 coaxially penetrates through the support extension seat 12, and a plurality of clutches 15 are connected between the inner wall of the support extension seat 12 and the middle shaft assembly 16 in a matching manner so as to realize connection and separation of the support extension seat 12 and the middle shaft assembly 16.

The driven bevel gear 10 is arranged around the outside of the supporting extension seat 12, and the chain wheel support 11 is arranged around the outside of the supporting extension seat 12. Specifically, the crankset support 11 is disposed around the outside of the first cylinder 121, and the crankset support 11 is located at an end of the first cylinder 121 far away from the second cylinder 122. The driven bevel gear 10 is arranged around the outside of the first cylinder 121, and the driven bevel gear 10 partially wraps the side of the chain wheel support 11. It should be noted that the supporting extension seat 12 is press-fitted with one of the chain wheel support 11 or the driven bevel gear 10, or with both the chain wheel support 11 and the driven bevel gear 10, and the press-fitting may be performed by using fixing methods such as interference connection, welding, and screw connection. After press fitting, the supporting extension seat 12, the chain wheel support 11 and the driven bevel gear 10 are fixedly connected together to form an integral assembly structure. The supporting extension seat 12, the chain wheel support 11 and the driven bevel gear 10 can also be integrally formed, so that the integrity is better.

The side part of the crankset support 11, which is not covered by the driven bevel gear 10, is connected with the second support 13, the side part of the second cylinder 122 is connected with the first support 14 in a surrounding manner, and the second support 13 and the first support 14 are both connected with the housing 1 to form a support. The second support 13 is located at the right side of the driven bevel gear 10, and the second bevel gear 14 is located at the left side of the driven bevel gear 10. Since the support extension holder 12, the crankset holder 11 and the driven bevel gear 10 form an integrated assembly structure, the second support member 13 and the first support member 14 respectively support the driven bevel gear 10 from both sides thereof, forming a both-end support structure. The distance between the second supporting piece 13 and the first supporting piece 14 is large, the stress of the two bearings is small, and the supporting stability can be effectively improved.

Specifically, a stop shoulder 111 is arranged at a position where the second supporting member 13 is mounted on the side of the crankset support 11, and the stop shoulder 111 protrudes out of the side of the crankset support 11, is matched with the shell 1, and is used for limiting and fixing the second supporting member 13 along the axial direction. One end of the second support member 13, which is far away from the shoulder 111, is provided with a fixed cover 131, the fixed cover 131 surrounds the crankset support 11, the fixed cover 131 is in threaded connection with the shell 1, the fixed cover 131 belongs to a part of the shell 1, and the shoulder 111 and the fixed cover 131 limit and fix the second support member 13 along the axial direction. The position of the second cylinder 122 where the first support 14 is mounted has a stop shoulder 123, and the stop shoulder 123 protrudes out of the side surface of the second cylinder 122, is matched with the housing 1, and fixes the first support 14 along the axis direction in a limiting manner.

In the assembling process, the support extension seat 12, the chain wheel support 11 and the driven bevel gear 10 can form an integral assembling structure, and then bearing installation parts of support bearings at two ends of the assembling structure and installation parts of the clutch can be integrally processed, so that the high concentricity between the support bearing and the clutch part adjacent to the support bearing and the clutch part is ensured, and the stability of the structure is further improved.

Preferably, the outer diameter of the first support 14 is smaller than the outer diameter of the second support 13. In the assembling process, the first supporting piece 14, the supporting extension seat 12, the driven bevel gear 10, the chain wheel support 11 and the second supporting piece 13 are assembled together, the assembled components are arranged in the shell 1 from the right side, the fixing cover 131 is screwed in from the right side, and the second supporting piece 13 is fixed, so that the installation is convenient.

It is also possible to set the outer diameter of the first support member 14 to be larger than the outer diameter of the second support member 13, and when mounting, the first support member 14, the support holder 12, the driven bevel gear 10, the crankset holder 11, and the second support member 13 are first assembled together, and then the assembled assembly is mounted into the housing 1 from the left side. It is also possible to provide the first support member 14 and the second support member 13 with the same outer diameter, and when mounting, the support bearing 12, the driven bevel gear 10, and the chain wheel support 11 are first assembled together and mounted in the housing 1, and then the second bearing 14 and the second support member 14 are mounted from the left side and the right side, respectively.

Referring to fig. 3, the planetary gear output support 5 and the bevel gear support 8 are sleeved along the direction of the output shaft of the motor, the planetary gear output support 5 is connected with the clutch 6, the clutch 6 is externally connected with the bevel gear support 8, and the second support member assembly 7 for supporting and positioning the bevel gear support 8 is connected around the bevel gear support 8. Through setting up planetary gear output support 5 and bevel gear support 8 and cup jointing along motor output shaft direction, axial length can be reduced to can reserve the length space of sufficient frame riser, so that can hold the battery of bigger capacity, make vehicle using motor output power bigger, the time of endurance longer.

Specifically, the first bearing assembly 7 includes a first bearing 71 and a second bearing 72 which are juxtaposed, the first bearing 71 and the second bearing 72 are respectively disposed around the side of the cup 82, and the first bearing 71 and the second bearing 72 are disposed separately, the first bearing 71 is disposed at an end close to the planetary gear 4, and the second bearing 72 is disposed at an end far from the planetary gear 4. The first bearing 71 and the second bearing 72 are arranged in a separated mode, so that the distance between the central supporting surfaces of the first bearing and the second bearing can be increased, the supporting force arm is prolonged, and the driving bevel gear 9 is supported more stably. Specifically, a spacer 73 is provided between the two bearings to achieve separation. The spacers 73 may be shims that wrap around the bevel gear support 8 or side projections that are integral with the bevel gear support 8.

Further, the inner diameter of the first bearing 71 is the same as that of the second bearing 72, and the outer diameter of the first bearing 71 is smaller than that of the second bearing 72. The supporting component 7 forms a cantilever supporting structure for the driving bevel gear 9, and compared with the first bearing 71, the distance between the second bearing 72 and the driving bevel gear 9 is shorter, the second bearing 72 provides stronger supporting force, the size of the second bearing 72 is larger than that of the first bearing 71, the distance between the central supporting surfaces of the second bearing and the driving bevel gear can be further increased, the supporting force arm is prolonged, and the supporting of the driving bevel gear 9 is more stable.

Specifically, the bevel gear support 8 is of a cup-shaped structure, the bevel gear support 8 is provided with a bottom 81 and a cup body 82, a through hole is formed in the middle of the bottom 81, and the driving bevel gear 9 is fixedly connected with the bevel gear support 8 through the through hole in the modes of interference, welding, threads and the like. The first bearing 71 and the second bearing 72 are respectively disposed around the sides of the cup 82. The planetary gear output carrier 5 has a male ring 51, and the male ring 51 is inserted into the cup 82. The clutch 6 is arranged between the convex ring 51 and the cup body 82, and the clutch 6 is matched and connected with the convex ring 51 and the cup body 82 and is used for realizing the connection and the disconnection of the bevel gear support 8 and the planetary gear output bracket 5.

Preferably, the upper end surface of the planetary gear 4 is provided with a gasket 3 for preventing the planetary gear 4 from being worn and preventing the planetary gear 4 from moving along the axial direction thereof, and the gasket 3 may be specifically configured as an annular gasket, and a central hole of the annular gasket is used for the output shaft of the power supply machine 2 to pass through.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.