WO2020175524A1

WO2020175524A1 - Motor unit and electric automobile

Info

Publication number: WO2020175524A1
Application number: PCT/JP2020/007637
Authority: WO
Inventors: 将史川上; 良平足立; 将崇田中
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2019-02-26
Filing date: 2020-02-26
Publication date: 2020-09-03
Also published as: DE112020000938T5; JPWO2020175524A1

Abstract

Provided are: a motor unit that can shorten the distance between a motor and a control board; and an electric automobile. A motor unit (3) is provided with a case (4), an input shaft body (60), an output body (8), a motor (5), a deceleration gear (311), and a control board (35). The input shaft body (60) is disposed so as to penetrate the case (4) in the direction of an axis (600) and to be rotatable around the axis (600). The output body (8) is disposed along an outer peripheral surface of the input shaft body (60) so as to be rotatable around the axis (600) and can be rotated by the rotational force of the input shaft body (60). The motor (5) is accommodated in the case (4) and comprises a rotor (52) and a stator (53). The deceleration gear (311) is accommodated in the case (4) and decelerates and transmits the rotation of the motor (5). The control board (35) is accommodated in the case (4) and controls the motor (5). The control board (35) is disposed toward one end of the deceleration gear (311), in the direction of the axis (600). The output body (8) is disposed toward the other end of the input shaft body (60) opposite the one end, in the direction of the axis (600).

Description

\¥0 2020/175 524 1 卩 (: 17 2020 /007637 Clarification

Title of invention: Motor unit and electric bicycle

Technical field

[0001] The present disclosure relates to a motor unit and an electric bicycle.

Background technology

[0002] Conventionally, an electric assisted bicycle having a drive unit is known (see, for example, Patent Document 1).

[0003] The drive unit disclosed in Patent Document 1 is mounted with a crankshaft, a motor, a first transmission gear that meshes with an output gear of the motor, and various electric components for controlling the operation of the drive unit. And a substrate. In this drive unit, the substrate is located on the opposite side of the motor in the axial direction of the crankshaft with respect to the first transmission gear.

[0004] In the conventional example as described above, the distance between the motor and the board becomes long, and the length of the wiring connected between them becomes long.

Prior art documents

Patent literature

Patent Document 1: Japanese Patent Laid-Open No. 2 0 1 4 _ 1 9 6 0 8 0

Summary of the invention

[0006] In view of the above conventional problems, it is an object of the present disclosure to provide a motor unit and an electric bicycle that can reduce the distance between the motor and the control board.

[0007] In order to solve the above-mentioned problems, a motor unit according to one aspect includes a case, an input shaft body, an output body, a motor, a reduction gear, and a control board. The input shaft body extends through the case in the axial direction and is rotatably arranged around the axis line. The output body is rotatably arranged around the axis along the outer peripheral surface of the input shaft body, and is rotatable by the rotational force of the input shaft body. The motor is housed in the case and has a rotor and a stator. Said deceleration 〇 2020/175 524 2 卩 (: 170? 2020/007637

The gear for use is housed in the case and decelerates and transmits the rotation of the motor. The control board is housed in the case and controls the motor. The control board is arranged on one end side of the reduction gear in the axial direction. The output body is arranged on the other end side of the input shaft body opposite to the _ end side in the axial direction.

[0008] Another form of motor unit includes a case, an input shaft, a reduction gear, a motor, and a control board. The input shaft body is arranged rotatably around the axis line while penetrating the case in the axial direction. The deceleration gear is housed in the case and decelerates and transmits the rotation of the motor. The motor has a rotor and a stator, and the rotor and the stator are housed at one end side of the reduction gear in the axial direction in the case. The control board is housed in the case and controls the motor. The control board is arranged on the one end side of the reduction gear in the axial direction.

[0009] A motor unit of still another form includes a case, an input shaft body, an output body, a motor, a reduction gear, and a control board. The input shaft body is arranged rotatably around the axis line while penetrating the case in the axial direction. The output body is rotatably arranged around the axis along the outer peripheral surface of the input shaft body, and is rotatable by the rotational force of the input shaft body. The motor is housed in the case and has a rotating shaft, a rotor that rotates integrally with the rotating shaft, and a stator. The deceleration gear is housed in the case and decelerates and transmits the rotation of the motor. The control board is housed in the case and controls the monitor. The rotor is arranged between the reduction gear and the control board in the rotation axis direction.

In order to solve the above problems, an electric bicycle according to one aspect includes the motor unit.

Brief description of the drawings

[001 1] [Fig. 1] Fig. 1 is a side view of the electric bicycle according to the first embodiment.

[Fig. 2] Fig. 2 is a cross-sectional view of the frame and the motor unit of the electric bicycle. \¥0 2020/175524 3 (: 17 2020/007637

It

[FIG. 3] FIG. 3 is a cross-sectional view taken along the line passing through the input shaft of the motor unit, the rotary shaft of the motor, and the axis of the second output body of the reduction mechanism.

[FIG. 4] FIG. 4 is a cross-sectional view taken along a cross section passing through the input shaft of the motor unit, the rotation shaft of the motor, and the axis of the second output body of the reduction mechanism according to the second embodiment.

[FIG. 5] FIG. 5 is a cross-sectional view taken along a cross section passing through the input shaft of the motor unit, the rotation shaft of the motor, and the axis of the second output body of the reduction mechanism according to the third embodiment.

[FIG. 6] FIG. 6 is a cross-sectional view taken along a cross section passing through the input shaft of the motor unit, the rotation shaft of the motor, and the axis line of the second output body of the reduction mechanism according to the fourth embodiment.

[FIG. 7] FIG. 7 is a cross-sectional view taken along a section plane that passes through the input shaft of the motor unit, the rotation shaft of the motor, and the axis of the second output body of the reduction mechanism according to the fifth embodiment.

[FIG. 8] FIG. 8 is a cross-sectional view taken along a cutting plane passing through the input shaft of the motor unit, the rotation shaft of the motor, and the axis of the second output body of the reduction mechanism according to the sixth embodiment.

[FIG. 9] FIG. 9 is a cross-sectional view taken along a section plane that passes through the input shaft of the motor unit, the rotary shaft of the motor, and the axis of the second output body of the reduction mechanism according to the seventh embodiment.

[FIG. 10] FIG. 10 is a cross-sectional view taken along a cross section passing through the input shaft of the motor unit, the rotating shaft of the motor, and the axis of the second output body of the reduction mechanism according to the eighth embodiment. [FIG. 11] FIG. 11 is a cross-sectional view taken along a cross section passing through the input shaft of the motor unit, the rotating shaft of the motor, and the axis of the second output body of the reduction mechanism according to the ninth embodiment. [FIG. 12] FIG. 12 is a cross-sectional view taken along a section taken through the input shaft of the motor unit, the rotary shaft of the motor, and the axis of the second output body of the reduction mechanism according to the modification.

[FIG. 13] FIG. 13 is a cross-sectional view taken along a cross section passing through the input shaft of the motor unit, the rotation shaft of the motor, and the axis of the second output body of the reduction mechanism according to the comparative example.

MODE FOR CARRYING OUT THE INVENTION

[0012] The present disclosure relates to a motor unit and an electric bicycle, and more particularly to a motor unit including a case, an input shaft body, a reduction gear, a motor and a control board, and an electric bicycle including the motor unit.

[0013] Hereinafter, regarding the first embodiment of the motor unit and the electric bicycle of the present disclosure, 〇 2020/175 524 4 卩 (: 170? 2020/007637

It will be described based on FIGS. 1 to 3.

As shown in FIG. 1, the electric bicycle 1 includes a frame 10, wheels 11, and a motor unit 3. The direction of travel of the electric bicycle 1 is fixed by design. In the following description, the traveling direction is the front and the opposite direction is the rear. The left side and the right side are the left side and the right side when facing forward.

[0015] The frame 10 supports a person who drives the electric bicycle 1 (hereinafter referred to as a driver). The load of the frame 10 and the driver is supported on the ground via the front wheels 1 1 1 and the rear wheels 1 1 2 which compose the wheels 11.

[0016] The frame 10 includes a head pipe 10 1, an upper pipe 10 2, a lower pipe 10 3, a vertical pipe 10 4, a seat stay 10 5, a chain stay 10 6 and a bracket 2. Have. The frame 10 is formed of a metal such as aluminum or stainless steel, but may include a nonmetal part. Further, the entire frame 10 may be formed of non-metal, and the material of the frame 10 is not particularly limited.

As shown in FIG. 2, the head pipe 10 1 is a tubular member that is open in a generally vertical direction. The term “generally up and down” as used herein means a direction that forms an angle of about 30 degrees or less with the vertical direction. As shown in FIG. 1, a handle post 12 is kneaded into the head pipe 10 1 so as to penetrate vertically. The handle post 12 is inserted into the head pipe 10 1 so as to be rotatable around the axial direction. A front fork 1 2 1 is formed at the lower end of the handle post 1 2. A front wheel 1 1 1 is rotatably attached to the front fork 1 2 1. The handlebars 1 2 2 are fixed to the upper ends of the handleposts 12. The handlebars 1 2 2 are provided with a hand-operated portion for performing electric switching and the like, and a gear shift operating portion for changing the speed by the gear shift mechanism of the rear wheels 1 1 2.

As shown in FIG. 2, the upper pipe 102 is a tubular member that extends substantially rearward of the head pipe 10 1. The upper pipe 102 does not have to be straight. 〇 2020/175 524 5 卩 (: 170? 2020/007637

Yes. The term "rearward" here means a direction that forms an angle of about 40 degrees or less with the rear. The front end of the upper pipe 10 2 is fixed to the rear side wall of the head pipe 10 1 by welding or the like. The rear end of the upper pipe 102 is fixed to the vertical pipe 104.

The standing pipe 104 is a tubular member that opens in a generally vertical direction. Vertical pipe 1

The rear end of the upper pipe 102 is fixed to the front side wall near the upper end of the upper pipe 04 by welding or the like. A shaft extending below the saddle 13 is inserted into the opening at the upper end of the vertical pipe 104, as shown in FIG. By fixing this shaft to the vertical pipe 104, the saddle 13 is fixed to the vertical pipe 104.

As shown in FIG. 2, the lower pipe 103 is a tubular member that extends obliquely downward and substantially rearward of the head pipe 10 1. The lower pipe 103 is not necessarily linear. It should be noted that the term “substantially rearward and downward” as used herein means a direction lower than the rear and also a direction extending below the direction in which the head pipe 10 1 extends. The front end portion of the lower pipe 103 is fixed by welding or the like to a portion of the side wall on the rear side of the head pipe 101 below the portion to which the upper pipe 102 is fixed. The bracket 2 is fixed to the rear end of the lower pipe 103.

[0021] The motor unit 3 is fixed to the lower side of the bracket 2, and the motor unit 3 is supported by the bracket 2. The motor unit 3 is fixed to the bracket 2 with a fastening member consisting of a bolt or bolt nut.

The rear end of the lower pipe 103 is fixed to the front end of the bracket 2 by fitting (including shrink fitting), fastening or welding. In the first embodiment, a through hole 25 penetrating vertically is formed in the front end portion of the bracket 2, and the cylindrical portion 2 51 projects from the peripheral portion of the through hole 25. A rear end portion of the lower pipe 10 3 is covered and fitted on the cylindrical portion 2 51.

[0023] The lower end of the standing pipe 104 is fixed to an intermediate portion of the bracket 2 in the front-rear direction by fitting (including shrink fitting), fastening, welding, or the like. In the first embodiment, a through hole 26 that vertically penetrates is formed in the middle portion of the bracket 2 and 〇 2020/175 524 6 卩 (: 170? 2020 /007637

The tubular portion 2 61 projects from the peripheral portion of the hole 26. The lower end of the standing pipe 10 4 is covered and fitted on the tubular portion 2 61.

The front end of the chain stay 106 is fixed to the rear end of the bracket 2 by fitting (including shrink fitting), fastening or welding. The chain stay 106 is two hollow or solid members extending substantially rearward from the bracket 2. In the first embodiment, the front end of the cylindrical chain stay 106 is fixed to the rear end of the bracket 2 by welding. Further, a through hole 27 penetrating forward and backward is formed at a position corresponding to the internal space of the chain stay 106 of the bracket 2.

As shown in FIG. 1, the front end of the seat stay 105 is fixed to the rear end of the upper pipe 102 by fitting (including shrink fitting), fastening or welding. The seat stay 105 is two hollow or solid members extending substantially rearward from the vicinity of the upper end of the standing pipe 105. In the first embodiment, the front end of the tubular seat stay 105 is fixed by welding or the like. The rear end of the seat stay 105 is fixed to the rear end of the chain stay 106, and the rear wheel 1 12 is rotatably attached to this part.

[0026] Further, as shown in Fig. 2, the bracket 2 and the lower pipe 103 are connected to a battery mounting portion to which a battery 15 (see Fig. 1) for supplying electric power to the motor unit 3 is mounted. Have 1 6. The battery mounting section 16 has a lower support section 161, which is formed on the bracket 2, and an upper support section 162, which is formed on the lower pipe 103. The lower support portion 1 61 is mounted so that the lower end portion of the battery 15 does not easily come off, and supports the battery 15. In addition, the lower supporting portion 1 61 has a plurality of terminals electrically connected to a plurality of battery terminals for power supply or signals formed at the lower end of the battery 15 respectively. One end of the wiring 163 is electrically connected to each of the plurality of terminals.

The upper support 1 62 has a lock device to which the upper end of the battery 15 is attached and which locks the battery 15 so that the battery 15 does not drop out.

[0028] In addition, in the lower pipe 103 and the wiring space 20 are provided a gear shift operation unit and a gear shift mechanism. 〇 2020/175 524 7 卩(: 170? 2020/007637

The speed change wire 17 and the brake wire that connect the

[0029] The motor unit 3 will be described below. As shown in FIG. 3, the motor unit 3 includes a case 4, a motor 5, an input shaft 6, an output body 8 (the first output body 8 in the first embodiment), and a reduction mechanism 31. , Is provided.

[0030] The case 4 constitutes an outer shell of the motor unit 3. The case 4 accommodates devices such as the speed reduction mechanism 31 in the accommodation space formed inside. The case 4 is mainly formed of a metal such as aluminum or stainless steel, but a nonmetal may be used and the material of the case 4 is not particularly limited.

[0031] The case 4 is divided into a first divided body 4 1 located on the left side and a second divided body 4 2 located on the right side.

[0032] In the first divided body 41, when viewed in the left-right direction, the peripheral portion projects to the right from the inside, and the accommodation space inside is opened to the right. Further, the first divided body 41 has a motor cup 57. A motor cup 5 7 is attached to a part of the first divided body ⁴¹ so as to project in the direction ^{_ in the} lateral direction and accommodate the motor 5 therein. The motor cup 5 7 is fixed to the first divided body 4 1 by a fastening member 5 7 1 made of a bolt. The case 4 is configured by combining a first divided body 41, a second divided body 4 2 and a motor cup 57.

[0033] The second divided body 42 has a peripheral edge portion projecting leftward from the inside when viewed in the left-right direction, and the accommodation space inside is opened leftward. The first divided body 4 1 and the second divided body 4 2 are aligned from the left and right so that the respective accommodation spaces are continuous, and are fixed to each other by a fastening member made of a bolt. The first divided body 4 1 and the second divided body 4 2 are fixed to each other to form a case 4. The size, shape and thickness of the case 4 are not particularly limited. Further, the accommodation space formed inside the case 4 may or may not be hermetically sealed.

The motor 5 is attached to the case 4. More specifically, the motor 5 is housed in a motor cup 5 7 which is mainly ear-mounted on the first divided body 4 1. The motor 5 has a rotary shaft 51, a port 52 that rotates integrally with the rotary shaft 51, and a station 53. Port 52, Stator 53, and part of rotary shaft 51 are 〇 2020/175 524 8 卩 (: 170? 2020/007637

— Located in Ta Cup 57. The rotary shaft 51 is rotatably accommodated so that the axial direction thereof faces the left-right direction. The rotating shaft 51 projects from the stator 53 in one direction (to the right in the first embodiment), and a tooth portion 54 that is engaged with the reduction mechanism 31 is formed on the outer surface of the projecting portion. The intermediate portion of the rotary shaft 5 1 is supported by the rotary shaft support bearing 5 5 1 arranged in the first divided body 4 1. The left end of the rotating shaft 51 does not particularly protrude from the stator 53, and is supported by the rotating shaft support bearing 552 arranged in the motor cup 57. The rotary shaft 51 may be supported by the rotary shaft support bearing at the left end portion and the right end portion of the rotary shaft 51, and the position of the rotary shaft support bearing is not limited.

[0035] The input shaft 6 is arranged rotatably around the axis 600 of the input shaft 6 while penetrating the case 4 in the axis 600 direction (the left-right direction in the first embodiment). The input shaft 6 has an input shaft body 60 and an input body 7. The input shaft 60 is made of a solid member in the first embodiment, but may be made of a hollow member.

[0036] The case 4 includes a first bearing 45 that rotatably supports the input shaft 60, and an axial line 6

It is provided on one end side in the 0 direction (left side in FIG. 3). An input shaft hole 411 through which the input shaft body 60 passes is formed in the first divided body 41, and a first bearing 45 is arranged in the input shaft hole 411. In the first embodiment, the first bearing 45 is composed of a ball bearing. Note that various other bearings such as roller bearings can be used as the first bearing 45, and are not limited to ball bearings.

Further, the case 4 has a second bearing 46 that rotatably supports the input shaft 60 on the other end side (right side in FIG. 3) in the axis 600 direction. An input shaft hole 4 2 1 through which the input shaft member 60 passes is formed in the second divided body 4 2, and a second bearing 4 6 is arranged in this input shaft hole 4 2 1. In the first embodiment, the input shaft body 60 is indirectly supported by the second bearing 46 via the first output body 8. In the first embodiment, the second bearing 46 is composed of a ball bearing. Note that various other bearings such as roller bearings can be used as the second bearing 46, and are not limited to ball bearings. 〇 2020/175 524 9 卩 (: 170? 2020 /007637

[0038] One end of a crank arm 18 is fixed to the end of the input shaft 60. A pedal 181 is rotatably attached to the other end of the crank arm 18 as shown in FIG. The driver of the electric bicycle 1 can transmit the rotational force of human power to the input shaft body 60 by pedaling the pedal 181.

As shown in FIG. 3, the input body 7 is arranged along the outer peripheral surface of the input shaft body 60 and rotates integrally with the input shaft body 60. The input body 7 is a tubular member, and its axis 600 is oriented in the left-right direction, and is arranged concentrically with the input shaft 60. The left-right length of the input body 7 is shorter than the left-right length of the input shaft body 60. The input body 7 and the input shaft body 60 have fitting parts 7 1 1 and 6 1 that are fitted to each other so as to be relatively unrotatable around the axis 600, in a part of the direction of the axis 600. Have. In the first embodiment, the left end portion of the input body 7 (more specifically, the first input body 7 1 described later) and the input shaft body 60 corresponding to this portion are fitted to the fitting portion 7 including a spline portion or a serration portion. 1 1 and 6 1 are formed. The fitting portions 7 1 1 and 6 1 may be configured to be fitted with a male screw and a female screw.

Further, in the first embodiment, the input body 7 is divided into a first input body 7 1 and a second input body 7 2. The first input body 71 is connected to the input shaft body 60. The first input body 71 is located in a part of the input shaft body 60 in the left-right direction, and at least a part thereof is housed in the first divided body 41. At the left end of the first input body 71, a fitting portion 711 for fitting with the input shaft body 60 is formed. A gap 70 is formed between the first input body 71 and the input shaft body 60 in the portion on the right side of the fitting portion 711 at the left end portion. This makes it easy to insert the input shaft body 60 into the first input body 71 having a cylindrical shape.

[0041] The second input body 7 2 is located at a position different from the first input body 7 1 in the axis 600 direction (to the right of the first input body 7 1 in the first embodiment), and the first input body 7 2 is located. It is connected to 7 1 and transmits rotational force to the 1st output body 8. However, the second input body 72 may be partially located at the same position in the left-right direction as the first input body 71. In the first embodiment, the left end portion of the second input body 7 2 is located radially outside the right end portion of the first input body 71 and overlaps in the radial direction. 1st input body 7 1 and 2nd input 〇 2020/175 524 10 boxes (: 170? 2020 /007637

The body 7 2 has fitting portions 7 1 2 and 7 2 1 which are fitted to each other such that they cannot rotate relative to each other around the axis line 600. In the first embodiment, the fitting portions 7 1 2 and 7 2 1 including a spline portion or a serration portion are formed on the right end portion of the first input body 7 1 and the left end portion of the second input body 7 2. Has been done. In the present invention, "radially overlapping" means a state in which at least a part of each object overlaps when viewed in the radial direction.

The first output body 8 is rotatably arranged around the axis 600 along the outer peripheral surface on the other end side (the right side in FIG. 3) of the input shaft 60 in the axis 600 direction. Rotational force is received from the input body 7. The first output body 8 is a member having a substantially cylindrical shape, and the axis 60 0 thereof is oriented in the left-right direction, and is arranged concentrically with the input shaft 60. The left-right length of the first output body 8 is shorter than the left-right length of the input shaft body 60. The right end portion of the first output body 8 projects outside the case 4 through an input shaft hole 4 21 formed in the second divided body 4 2. The first output body 8 is supported by the second bearing 4 6 arranged in the second divided body 4 2. The first output body 8 constitutes a rotary shaft unit 30 together with the input shaft body 60 and the input body 7. The rotating shaft unit 30 is supported by the case 4 via the first bearing 45 and the second bearing 46.

[0043] In the portion of the first output body 8 protruding outside the case 4, the front sprockets 19

1 is fixed. The front sprocket 1 91 rotates together with the first output body 8. Also, as shown in Fig. 1, the rear sprocket 1 92 is fixed to the hub of the rear wheel 1 1 2. A chain 193 is hung between the front sprocket 191 and the rear sprocket 192.

As shown in FIG. 3, in the first embodiment, the one-way clutch 32 is arranged between the input body 7 and the first output body 8. The input body 7 and the first output body 8 are overlapped in the radial direction of the input shaft 6 so that the input body 7 is on the inner side and the first output body 8 is on the outer side, which is a so-called outer output structure. .. The one-way clutch 3 2 transmits the rotational force to the first output body 8 when the rotational force in the direction for accelerating the electric bicycle 1 in the traveling direction (hereinafter referred to as the acceleration direction) is applied to the input body 7. If a rotational force in the direction opposite to the acceleration direction is applied, apply this rotational force to the first output body 8 〇 2020/175 524 1 1 卩(: 170? 2020/007637

Do not communicate to. Further, the one-way clutch 32 does not transmit the rotational force to the input body 7 when the rotational force in the acceleration direction is applied to the first output body 8 via the reduction mechanism 31 described later. In the first embodiment, the one-way clutch 32 has a ratchet and is supplied with grease. Note that various one-way clutches 32 can be used as appropriate, and are not limited. For example, a mouth roller type one-way clutch or a sprag type one-way clutch may be used.

Further, in the first embodiment, in a part of the range in the axis 600 direction,

2 The input body 72 and the first output body 8 overlap in the radial direction of the input shaft body 60. A one-way clutch 3 2 is provided between the second input body 7 2 and the first output body 8 which are overlapped in the radial direction.

[0046] The motor unit 3 has a reduction mechanism 3 1 having a reduction gear 3 1 1.

The deceleration mechanism 31 is housed in the case 4, decelerates the rotation of the motor 5 and transmits it to the second output body 310. The reduction gear 311 is arranged on the other end side (right side in FIG. 3) of the port 52 and the stator 53 in the case 600 in the direction of the axis 600. In other words, the port 52 and the stator 53 are arranged at one end side (left side in FIG. 3) of the reduction gear 311 in the direction of the axis 600 in the case 4.

Further, in the first embodiment, the motor unit 3 includes the second output body 310 different from the output body 8 (referred to as the first output body). The motor unit 3 of the first embodiment is a so-called biaxial motor unit. One end portion (the left end portion in the first embodiment) of the second output body 310 in the axial direction is located in the case 4 and is rotatable by the bearings 3 1 4 1 arranged in the first divided body 4 1. Supported by.

[0048] The other end (the right side in Fig. 3) of the second output body 310 in the axial direction is rotatably supported by the bearings 3 1 4 2 arranged in the second divided body 4 2 and the right end portion. Is located outside case 4. A sprocket 194 is fixed to the right end portion of the second output body 310 so as to rotate integrally with the second output body 310. The chain 193 is hung around the sprocket 194, which is hung around the front sprocket 191. [0049] On the outer peripheral surface of the second output body 310, a large-diameter tooth portion 3 1 which meshes with the tooth portion 5 4 of the rotary shaft 5 1 of the motor 5 via the one-way clutch 3 13 3. A reduction gear 311 having 2 is attached.

[0050] When the driver pedals the pedal 1 81 of the electric bicycle 1, a rotational force in the acceleration direction is applied to the input shaft body 60. When the input shaft body 60 rotates, the first input body 71 and the second input body 72 rotate together with the input shaft body 60. The rotational force in the acceleration direction of the second input body 7 2 is applied to the first output body 8 via the one-way clutch 32 in the acceleration direction, so that the first output body 8 and the front sprocket 1 9 1 Rotate in the acceleration direction. When the front sprocket 1 91 rotates in the acceleration direction, a rotational force in the acceleration direction is applied to the rear sprocket 1 9 2 via the chain 1 93, and the rear sprocket 1 9 2 and The rear wheels 1 1 2 rotate in the acceleration direction. As a result, the electric bicycle 1 moves in the traveling direction.

[0051] When the rotating shaft 5 1 of the motor 5 rotates in the accelerating direction while the electric bicycle 1 is manually moving in the moving direction, the tooth portion 3 1 2 that scoops up with the rotating shaft 5 1 of the motor 5 moves in the accelerating direction. Rotate. The rotational force of the tooth portion 3 1 2 in the acceleration direction is transmitted to the second output body 3 1 0 via the one-way clutch 3 1 3 and applied to the chain 1 9 3.

When the electric bicycle 1 is manually driven in the traveling direction and the motor 5 is not driven, the second output body 310 rotates in the acceleration direction, but the second output body 310 rotates. The rotational force in the acceleration direction is not transmitted to the rotating shaft 5 1 of the motor 5 by the one-way clutch 3 1 3. This prevents rotation of the rotary shaft 51 and the port 52 when the motor 5 is not driven.

In the motor unit 3, a control board 35 having a control unit for controlling the motor 5 is arranged in the case 4. The control unit has, for example, a microcomputer, and controls the operation of each element by executing a program stored in a storage unit such as a ROM (Read Only Memory). As such a control unit, various ones can be appropriately used, and detailed description thereof will be omitted. The control unit controls the rotational force from the motor 5 based on the torque detected by the torque detection unit 33 and the number of revolutions detected by the rotation detection unit 34. 〇 2020/175 524 13 卩 (: 170? 2020/007637

The control board 35 has a plurality of mounted electric components 3 51. The plurality of electric components 3 5 1 include, for example, a capacitor, an integrated circuit (Hall ∨ 〇, and a heating element that is particularly prone to generate heat. The heating element supplies power to the motor 5, for example. A plurality of electric parts 3 51 may include various resistors, connectors, etc. The control board 35 is a switching element such as a knife and a micro controller. One of Pyuyu is implemented.

[0055] The control board 35 is located on one end side of the reduction gear 311 in the direction of the axis 600 (Fig.

It is located on the left in 3). To further explain, the control board 35 is arranged on the other end side (right side in FIG. 3) of the stator 5 3 and is arranged between the stator 5 3 and the reduction gear 3 11 1.

[0056] Further, the case 4 (first divided body 4 1) has a space inside the case 4 as a first space 40 1 in which a port 52, a stator 5 3 and a control board 35 are arranged. It has a second space 40 2 in which the reduction gear 3 1 1 is arranged and a partition 40 3 which divides the space. The partition part 40 3 prevents the lubricating oil and the grease applied to the tooth part 5 4 from scattering and adhering to the control substrate 35. A concave portion into which the rotary shaft support bearing 5 51 is inserted is formed on the first space 4 01 side of the partition 40 3.

Further, in the first embodiment, the tooth portion 54 of the rotation shaft 5 1 of the motor 5 and the rotation shaft

An oil barrier 4 7 is arranged to cover the tip of 5 1. The oil barrier portion 47 is preferably made of a material different from that of the first dividing body 41 and the second dividing body 42. The first divided body 41 and the second divided body 42 are made of metal, whereas the oil-retaining portion 47 is preferably made of resin, and the weight of the motor unit 3 can be reduced.

[0058] In the electric bicycle 1, according to the torque applied to the input shaft 6 (the input shaft body 60) and the number of rotations of the input shaft body 60 per unit time, the rotation from the motor 5 is performed. Power is controlled. The torque applied to the input shaft 60 is detected by the torque detector 33. The torque detection unit 33 is arranged in a part of the range of the axis 600 direction along the outer peripheral surface of the rotary shaft unit 30. 〇 2020/175 524 14 卩 (: 170? 2020 /007637

In the first embodiment, the magnetostriction generating portion 3 3 1 having magnetic anisotropy is formed on the outer peripheral surface of the first input body 7 1. Further, the coil 3 3 2 is arranged at a slight distance from the portion where the magnetostriction generating portion 3 3 1 is provided on the outer peripheral surface of the first input body 7 1. A magnetostrictive torque sensor as the torque detection unit 33 is configured by the magnetostriction generation unit 3 31 and the coil 3 32. As such a magnetostrictive torque sensor, various types can be appropriately used. Further, the torque detector 33 is not limited to the magnetostrictive torque sensor.

[0060] The torque detection unit 33 is arranged on the left side of the one-way clutch 3 2 and the second bearing 46 in the direction of the axis 600.

The rotation speed of the input shaft 6 (input shaft body 60) per unit time is detected by the rotation detection unit 34. The rotation detection unit 34 has a detection unit 3 41 attached to the rotation shaft unit 30 and a detection unit 3 42 fixed to a portion other than the rotation shaft unit 30.

In the first embodiment, the rotating body 340 is attached to the outer peripheral surface of the second input body 72. The rotating body 340 is attached by press-fitting the outer peripheral surface of the second input body 72 on the inner peripheral surface thereof. The rotating body 340 rotates integrally with the second input body 72. The rotating body 340 has a portion extending in the axial direction 600 of the input shaft 6 and a portion extending in the radial direction of the input shaft 6. A portion extending in the radial direction of the input shaft 6 has magnets arranged at regular intervals in the circumferential direction as a detected portion 3 41. Further, the control board 35 is provided with a hole ◯ for detecting the magnetic force of the magnet as a detecting portion 3 42 at a position corresponding to the magnet which is the detected portion 3 41. As the rotation detecting section 34 having such a magnet and a Hall sensor <3, various ones can be appropriately used. Further, the rotation detection unit 34 is not limited to the one having the magnet and the Hall IO.

Further, in the first embodiment, the motor unit 3 has a mouth rotation detection unit 58 for detecting rotation of the mouth 52 of the motor 5. Specifically, the control substrate 35 is provided with a magnetic force associated with the rotation of the mouthpiece 52 as a mouthpiece rotation detection portion 58 for detecting the number of rotations of the mouthpiece 52 per unit time. Hall to detect changes in 〇 2020/175 524 15 卩(: 170? 2020/007637

I 〇 has been implemented. The magnetic force detected by the Hall sensor as the rotor rotation detection unit 58 may be the magnetic force caused by the port motor 52 or the magnetic force caused by another member rotating together with the port motor 52.

In the first embodiment, the motor unit 3 is provided with a magnet 59 that rotates together with the port 52. The magnet 59 is a disk-shaped magnet that is fixed to the rotating shaft 5 1 of the motor 5 and rotates integrally with the rotating shaft 5 1. The magnet 59 is located on the other end side (right side in FIG. 3) of the mouth 52 and on one end side (left side in FIG. 3) of the control board 35. That is, the magnet 59 is located between the rotor 52 and the control board 35 in the direction of the axis 600. The control board 35 is arranged so as to overlap with the stator 5 3, the reduction gear 3 11 and the magnet 5 9 when viewed in the direction of the axis 600. Since the control board 35 is located away from the rotor 52 and the magnet 59 in the direction of the axis 600, it does not interfere with the rotor 52 and the magnet 59 in the direction orthogonal to the axis 600. , Can be widely set in the direction orthogonal to the axis 600.

[0065] The magnet 5 9 is fixed to the rotary shaft 5 1 of the motor 5 and rotates integrally with the rotary shaft 5 1, and as a result, a hole is provided as a rotor rotation detection unit 5 8 mounted on the control board 35. Can detect the magnetic force of the magnet 59 to detect the rotation of the rotating shaft 51. Note that the magnet 59 has an arbitrary configuration and may not be provided.

[0066] In the first embodiment, the rotor 5 2 and the stator 5 3 are arranged on one end side (left side in Fig. 3) of the reduction gear 3 11 and the control board 35 is provided on the reduction gear 3 1 1. It is located at one end of 1. In this case, the reduction gear 311 is not located between the control board 35 and the rotor 52 and the stator 53. Therefore, the distance between the mouth 5 2 and the stator 5 3 and the control board 35 should be shortened compared to the case where the reduction gear 311 is located between the control board 35. You can In the comparative example shown in FIG. 13, the reduction gear 3 11 is located between the rotor 5 2 and the stator 5 3 of the motor 5 and the control board 3 5 in the axis 600 direction of the input shaft body 60. Therefore, the distance between the port 52 and the stator 5 3 and the control board 35 is long. Therefore, connect between motor 5 and control board 35. 〇 2020/175 524 16 卩 (: 170? 2020/007637

However, the length of the wiring to be used becomes long. On the other hand, in the first embodiment, the length of the wiring connected between the rotor 52 and the stator 53 and the control board 35 can be shortened, and the power loss in the power feeding via the wiring is reduced. The driving efficiency of the motor 5 is improved. Also, since the wiring becomes shorter, the cost for wiring is reduced, and the wiring can be easily crawled.

[0067] Further, since the motor unit 3 is provided with the magnet 59 that rotates together with the mouth unit 52, the change in the magnetic force due to the rotation of the mouth unit 52 becomes large, and the rotation of the mouth unit 52 is increased. It becomes easier to detect the change in magnetic force due to.

Next, a second embodiment of the motor unit 3 and the electric bicycle 1 will be described based on FIG. Since the motor unit 3 and the electric bicycle 1 according to the second embodiment are largely the same as the motor unit 3 and the electric bicycle 1 according to the first embodiment, the following mainly describes the first embodiment. The parts different from the above will be explained.

In the first embodiment, the control board 35 has the stator 5 in the axis 600 direction.

3 is arranged on the other end side (right side in FIG. 3) of the third embodiment, in the second embodiment, one end side of the stator 52 and the stator 53 in the direction of the axis 600 (in FIG. 4). Is located on the left side). The port 52 is arranged between the reduction gear 311 and the control board 35 in the direction of the rotating shaft 51.

[0070] Further, in the first embodiment, the magnet 59 is also the stator in the direction of the axis 600.

While it is arranged on the other end side (right side in FIG. 3) of 53, in the second embodiment, it is arranged on one end side (left side in FIG. 4) of the stator 53 in the direction of the axis 600. ing. The magnet 59 is arranged on the other end side (right side in FIG. 4) of the control board 35.

[0071] In the second embodiment, since the control board 35 is arranged on one end side of the stator 53, the fastening board 571 is removed and the motor cup 57 is removed to replace the control board 35. It's easy to do.

Next, a third embodiment of the motor unit 3 and the electric bicycle 1 will be described with reference to FIG. The motor unit 3 and the electric motor according to the third embodiment are 〇 2020/175 524 17 卩(: 170? 2020/007637

Since the bicycle 1 is almost the same as the motor unit 3 and the electric bicycle 1 according to the first embodiment shown in FIG. 3, the portions different from the first embodiment will be mainly described below.

The magnet 59 is provided in the first embodiment, whereas the magnet 59 is not provided in the third embodiment. The magnetic force detected by the Hall I 0 as the mouth rotation detection unit 58 is the magnetic force caused by the magnet included in the mouth 52.

In the third embodiment, since the magnet 59 is not provided, it is possible to reduce the number of parts in the motor unit 3 and the electric bicycle 1, reduce the weight, and reduce the cost.

Next, a fourth embodiment of the motor unit 3 and the electric bicycle 1 will be described based on FIG. Since the motor unit 3 and the electric bicycle 1 according to the fourth embodiment are mostly the same as the motor unit 3 and the electric bicycle 1 according to the second embodiment shown in FIG. 4, the following description will be made mainly. Portions different from the second embodiment will be described.

The magnet 59 is provided in the second embodiment, whereas the magnet 59 is not provided in the fourth embodiment. The magnetic force detected by the Hall I 0 as the mouth rotation detection unit 58 is the magnetic force caused by the magnet included in the mouth 52.

In the fourth embodiment, since the magnet 59 is not provided, it is possible to reduce the number of parts in the motor unit 3 and the electric bicycle 1, reduce the weight, and reduce the cost.

Next, a fifth embodiment of the motor unit 3 and the electric bicycle 1 will be described with reference to FIG. Since the motor unit 3 and the electric bicycle 1 according to the fifth embodiment are largely the same as the motor unit 3 and the electric bicycle 1 according to the first embodiment, the following mainly describes the first embodiment. The parts different from the above will be explained.

In the first embodiment, the control board 35 is arranged in the first space 401, whereas in the fifth embodiment, the control board 35 is arranged in the second space 402, that is, the partition portion. It is placed on the other end side (right side in Fig. 7) of the axis in the direction of the axis 600. 〇 2020/175 524 18 卩 (: 170? 2020/007637

ing. Further, the control board 35 is arranged so as to overlap with the motor 52 and the stator 53 of the motor 5 and the reduction gear 311 when viewed in the direction of the axis 600.

[0080] In the fifth embodiment, since the control board 35 is not arranged in the first space 401, it is not necessary to make the first space 401 large, and the space saving of the first space 401 and the case 4 can be made compact. Further, by disposing the control board 35 in the space between the motor 5 and the reduction gear 311, it is possible to effectively utilize this space and increase the area of the control board 35.

Next, a sixth embodiment of the motor unit 3 and the electric bicycle 1 will be described with reference to FIG. The motor unit 3 and the electric bicycle 1 according to the sixth embodiment are mostly the same as the motor unit 3 and the electric bicycle 1 according to the first embodiment shown in FIG. Portions different from the first embodiment will be described.

In the first embodiment, the rotor 52, the stator 53 and the control board 35 are arranged in the first space 401, and the reduction gear 311 is arranged in the second space 420. , And had a dividing section 40 3. On the other hand, in the sixth embodiment, the partition part 40 3 is not provided.

Further, in the first embodiment, a recess is formed in the partition 40 3 and the rotary shaft support bearing 5 51 is inserted in this recess, whereas in the sixth embodiment the rotary shaft is supported. The support bearing 5 51 is inserted in the recess formed in the inner surface of the second divided body 4 2. Further, the control board 35 is arranged so as to overlap the motor 52, the stator 52 and the stator 53, and the reduction gear 3111 when viewed in the direction of the axis 600.

[0084] In the sixth embodiment, since the partition 403 is not provided, the case 4 can be made compact. Further, by disposing the control board 35 in the space between the motor 5 and the reduction gear 311, it is possible to effectively utilize this space and increase the area of the control board 35.

Next, a seventh embodiment of the motor unit 3 and the electric bicycle 1 will be described with reference to FIG. The motor unit 3 and the electric bicycle 1 according to the seventh embodiment are the same as the motor unit 3 and the electric bicycle according to the sixth embodiment shown in FIG. 〇 2020/175 524 19 卩(: 170? 2020/007637

Since it is almost the same as the vehicle 1, most of the differences from the first embodiment will be described below.

The magnet 59 is provided in the sixth embodiment, whereas the magnet 59 is not provided in the seventh embodiment. The magnetic force detected by the Hall I 0 as the mouth rotation detection unit 58 is the magnetic force caused by the magnet included in the mouth 52. Further, the control board 35 is arranged so as to overlap the port 52 and the stay 53 of the motor 5 and the reduction gear 31 1 when viewed in the direction of the axis 600.

In the seventh embodiment, since the magnet 59 is not provided, it is possible to reduce the number of parts in the motor unit 3 and the electric bicycle 1, reduce the weight, and reduce the cost. Further, by disposing the control board 35 in the space between the motor 5 and the reduction gear 311, it is possible to effectively utilize this space and increase the area of the control board 35.

Next, an eighth embodiment of the motor unit 3 and the electric bicycle 1 will be described with reference to FIG.

A description will be given based on 0. The motor unit 3 and the electric bicycle 1 according to the eighth embodiment are almost the same as the motor unit 3 and the electric bicycle 1 according to the first embodiment shown in FIG. 3, and therefore, in the following, The differences from the first embodiment will be mainly described.

[0089] In the first embodiment, the portion of the oil retaining portion 47 facing the tip of the rotating shaft 51 is flat, whereas in the eighth embodiment, the rotating shaft 5 1 of the oil retaining portion 47 is The portion of the shaft facing the tip of the rotary shaft 5 1 is a curved portion 4 71 bulging away from the tip of the rotary shaft 5 1. The curved portion 4 71 is formed in a curved shape so as to form a part of a spherical surface or a part of a cylindrical surface, for example. By forming the curved portion 4 71, the rotation axis 5 1 can be lengthened, and the bending rigidity of the oil retaining portion 4 7 is improved.

Next, a ninth embodiment of the motor unit 3 and the electric bicycle 1 will be described with reference to FIG.

It will be explained based on 1. The motor unit 3 and the electric bicycle 1 according to the ninth embodiment are mostly the same as the motor unit 3 and the electric bicycle 1 according to the second embodiment shown in FIG. 4, and therefore, in the following, Mainly second embodiment 〇 2020/175 524 20 卩 (: 170? 2020 /007637

Parts different from the state will be described.

[0091] In the second embodiment, the portion of the oil retaining portion 47 facing the tip of the rotating shaft 51 is a flat plate, whereas in the ninth embodiment, the rotating shaft 5 1 of the oil retaining portion 47 is The portion of the shaft facing the tip of the rotary shaft 5 1 is a curved portion 4 7 1 that bulges away from the tip of the rotary shaft 5 1. The curved portion 4 71 is formed in a curved shape so as to form a part of a spherical surface or a part of a cylindrical surface, for example. By forming the curved portion 4 71, the rotation axis 5 1 can be lengthened, and the bending rigidity of the oil retaining portion 4 7 is improved.

[0092] Next, modifications of the first to ninth embodiments will be described.

The rotation detection unit 34 and the mouth rotation detection unit 58 do not have to have a hole, but may have a so-called optical sensor. In this case, the rotating body is fixed to the outer peripheral surface of the second input body 72 so as to rotate integrally with the second input body 72. The rotating body has, as the detected portion, teeth and light transmitting portions formed between the teeth at regular intervals in the circumferential direction. Further, as the detection unit, an optical sensor is arranged so as to sandwich the tooth portion of the rotating body from the left and right. The optical sensor has a light emitting portion arranged on the left side of the tooth portion and a light receiving portion arranged on the right side of the tooth portion.

[0094] The motor unit 3 according to the ninth to ninth embodiments is a so-called biaxial motor unit, and includes a first output body 8 and a second output body 3 independent of the first output body 8. Was one having 10. On the other hand, the motor unit 3 may be a so-called single-axis type motor unit. The uniaxial motor unit will be described with reference to FIG.

[0095] The one-axis motor unit according to the present modified example uses the second output body 3 1 as the output body.

It differs from the first to ninth embodiments in that only the output body 8 is provided without 0, and in the reduction mechanism 31.

[0096] The output body 8 has a web 8 1 and a rim 8 2 on the outer peripheral surface side in a portion overlapping the input body 7 in the direction of the axis 600. The web 81 projects radially outward. The rim 82 is connected to the radially outer end of the web 81. The length of the rim 8 2 in the direction of the axis 600 is in the direction of the axis of the web 81. 〇 2020/175 524 21 卩 (: 170? 2020/007637

Longer than. The rim 8 2 has a tooth portion 8 3 on the outer peripheral surface that meshes with the reduction mechanism 3 1.

The deceleration mechanism 31 is housed in the case 4, decelerates the rotation of the motor 5 and transmits it to the output body 8. The reduction mechanism 3 1 has a first transmission gear 3 15 and a second transmission gear 3 16. The outer diameter of the first transmission gear 3 15 is larger than the outer diameter of the second transmission gear 3 16. The number of teeth of the first transmission gear 3 15 is larger than the number of teeth of the second transmission gear 3 16.

The first transmission gear 3 15 is rotated by the rotating force of the rotating shaft 5 1 of the motor 5. In the present modification, the first transmission gear 3 15 is composed of a tubular member, and the outer peripheral surface of the first transmission gear 3 15 has teeth 5 4 formed on the rotating shaft 5 1 of the motor 5 that mesh with each other. ing. The first transmission gear 3 15 is arranged along the outer peripheral surface of the transmission rotation shaft 3 10 1 included in the reduction mechanism 3 1. In this modification, the first transmission gear 3 15 is configured to receive the rotational force directly from the rotary shaft 51 of the motor 5, but a gear may be interposed therebetween.

The transmission rotary shaft 3101 is rotatably accommodated in the case 4 such that the axial direction is in the left-right direction. The transmission rotary shaft 3 1 0 1 is located between the rotary shaft 5 1 of the motor 5 and the input shaft body 60, and in the left-right direction, the portion protruding rightward from the stator 5 3 of the rotary shaft 5 1. It is placed at the same position as. The left end of the transmission rotary shaft 3101 is supported by the transmission rotary shaft support bearing 3171 arranged in the first divided body 41, and the right end of the transmission rotary shaft 3101 is divided into the second split. It is supported by a transmission rotary shaft support bearing 3 1 7 2 arranged on the body 4 2. The rotary shaft 51 and the transmission rotary shaft 3101 (more specifically, the motor 5 and the speed reduction mechanism 31) are appropriately arranged at arbitrary positions around the axis 600 as viewed from the input shaft 60. It

[0100] The first transmission gear 3 1 5 is transmitted through the one-way clutch 3 1 8 to the transmission rotary shaft 3

Concatenated to 1 0 1. The one-way clutch 3 1 8 transmits the rotational force to the transmission rotary shaft 3 1 0 1 when the rotational force in the acceleration direction is applied to the first transmission gear 3 1 5 and the rotational force in the direction opposite to the acceleration direction is applied. In this case, this rotational force is not transmitted to the transmission rotary shaft 3 1 0 1. In addition, the rotational force in the acceleration direction is applied to the transmission rotary shaft 3101. 〇 2020/175 524 22 卩 (: 170? 2020/007637

In such a case, this torque is not transmitted to the first transmission gear 31 5.

[0101] The second transmission gear 3 1 6 is fixed to the right side of the portion of the transmission rotary shaft 3 1 0 1 where the one-way clutch 3 1 8 is fixed so as to rotate integrally with the transmission rotary shaft 3 1 0 1. .. The second transmission gear 3 16 transmits the rotational force received from the first transmission gear 3 15 via the transmission rotation shaft 3 10 1 to the tooth portion 8 3 of the output body 8. The second transmission gear 3 16 has, on its outer peripheral surface, a tooth portion 3 19 which meshes with a tooth portion 8 3 formed on the rim 8 2 of the output body 8.

[0102] Although not shown, the control board 35 is equipped with a hall ◯ as a mouth rotation detecting section for detecting the number of revolutions of the mouth 52 per unit time. The data rotation detection unit has an arbitrary configuration and may not be provided. A disc-shaped magnet that rotates integrally with the rotation shaft is provided as a magnet detected by the rotation detection unit. The disk-shaped magnet may not be provided, and the mouth rotation detection unit may detect the magnetic force caused by the magnet included in the mouth 52.

[0103] The control board 35 is arranged on one end side (the left side in Fig. 12) of the first transmission gear 3 15 in the direction of the axis 600. Further describing, the control board 35 is arranged on the other end side of the stator 53 (right side in FIG. 12) and is arranged between the stator 53 and the first transmission gear 315. Further, the control board 35 is arranged so as not to overlap the stator 53 of the motor 5 but to overlap the port motor 52 when viewed in the direction of the axis 600, but the rotor 52 and the stator 5 3 may be arranged so as to overlap with each other, or may be arranged so as not to overlap with the port 52 and to overlap with the stator 5 3.

[0104] In addition, the control board 35 is arranged such that the stator 52 and the stator in the direction of the axis 600.

It may be arranged on one end side (left side in Fig. 12) of 5 3.

[0105] In addition, in the space inside Case 4, the space where rotor 5 2 and stator 5 3 are arranged, and reduction mechanism 3 1 (first transmission gear 3 1 5 and second transmission gear 3 1 6) are arranged. The space may be separated from the space. In this case, the control board 35 may be arranged in a space where the rotor 52 and the stator 53 are arranged, or may be arranged in a space where the deceleration mechanism 31 is arranged. 〇 2020/175 524 23 卩 (: 170? 2020/007637

[0106] When the driver pedals the pedal 1 81 of the electric bicycle 1, a rotational force in the acceleration direction is applied to the input shaft body 60. When the input shaft body 60 rotates, the first input body 71 and the second input body 72 rotate together with the input shaft body 60. The rotational force of the second input body 7 2 in the acceleration direction is applied to the output body 8 via the one-way clutch 3 2 in the acceleration direction, and the output body 8 and the front sprocket 1 9 1 rotate in the acceleration direction. To do. When the front sprocket 1 91 rotates in the acceleration direction, a rotational force in the acceleration direction is applied to the rear sprocket 1 9 2 via the chain 1 93, and the rear sprocket 1 9 2 and the rear wheel 1 1 2 rotates in the acceleration direction. As a result, the electric bicycle 1 moves in the traveling direction.

[0107] Further, the rotational force from the motor 5 can be applied to the output body 8 as an auxiliary force while the electric bicycle 1 is moving in the traveling direction by human power. The details will be described below. When the rotary shaft 5 1 of the motor 5 rotates in the acceleration direction, the first transmission gear 3 1 5 meshing with the rotary shaft 5 1 of the motor 5 rotates in the acceleration direction. The rotational force in the acceleration direction of the first transmission gear 3 1 5 is fixed to the transmission rotation shaft 3 1 0 1 and the transmission rotation shaft 3 1 0 1 via the one-way clutch 3 1 8 and the second transmission gear 3 1 6 And the second transmission gear 3 16 rotates in the acceleration direction. The rotational force in the acceleration direction of the second transmission gear 3 16 is transmitted to the output body 8 that scoops up with the second transmission gear 3 16. That is, the output body 8 functions as a resultant body in which the rotational force of the human power from the input body 7 and the rotational force from the motor 5 are combined.

[0108] Further, a case will be described in which the motor 5 is not driven while the electric bicycle 1 is manually moving in the traveling direction. In this case, since the output body 8 is rotating in the acceleration direction, the second transmission gear 3 1 6 and the transmission rotary shaft 3 1 0 1 which are entwined with the output body 8 rotate in the acceleration direction, but the transmission rotary shaft The rotational force in the acceleration direction of 3 1 0 1 is not transmitted to the first transmission gear 3 1 5 by the one-way clutch 3 1 8. This prevents the rotating shaft 51 and the rotor 52 from rotating when the motor 5 is not driven.

[0109] In addition, the _-axis type motor unit 3 according to the modified example is the rotary shaft of the motor 5.

The axis of 5 1 and the axis of the input shaft 60 are almost parallel, but the rotation axis of the motor 5 〇 2020/175 524 24 卩 (: 170? 2020/007637

The axis of 1 and the axis of the input shaft 60 are not limited to being parallel. For example, the motor 5 may be provided so that the axis of the rotary shaft 51 of the motor 5 is substantially perpendicular to the axis of the input shaft 60. Even in this case, the output of the motor 5 is transmitted to the output body 8 via the speed reducer mechanism 31. In this case, a bevel gear or the like is used for the speed reduction mechanism 31 as a mechanism for transmitting the output of the motor 5 to the output body 8. The structure of the deceleration mechanism is not limited to the one using the bevel gear.

As is clear from the above-described first to ninth embodiments and their modifications, the motor unit (3) of the first aspect includes the case (4) and the input shaft body (6). 0), an output body (8), a motor (5), a reduction gear (3 11) and a control board (3 5). The input shaft body (60) passes through the case (4) in the direction of the axis (600) and is rotatably arranged around the axis (600). The output body (8) is rotatably arranged around the axis (600) along the outer peripheral surface of the input shaft (60) and is rotatable by the rotational force of the input shaft (60). is there. The motor (5) is housed in the case (4) and has a mouth (52) and a stator (53). The reduction gear (3 1 1) is housed in the case (4) and reduces the rotation of the motor (5) and transmits it. The control board (35) is housed in the case (4) and controls the motor (5). The control board (35) is arranged at one end side of the reduction gear (311) in the direction of the axis (600). The output body (8) is arranged on the other end side of the input shaft body (60) opposite to the one end side in the direction of the axis (600).

[0111] According to the first aspect, the distance between the rotor (52) and the stator (53) and the control board (35) can be shortened. As a result, it is possible to reduce the length of the wiring that is connected between the port (5 2) and the stator (5 3) and the control board (3 5), and it is possible to reduce the power loss during power feeding through the wiring. Is reduced, and the drive efficiency of the motor (5) is improved. In addition, since the wiring becomes shorter, the cost of wiring is reduced, and the wiring is easier to crawl.

[0112] The motor unit (3) of the second aspect includes a case (4), an input shaft body (60), a reduction gear (311), a motor (5), and a control board (3). 3 5) and 〇 2020/175 524 25 卩 (: 170? 2020/007637

Prepare The input shaft body (60) passes through the case (4) in the direction of the axis (600) and is rotatably arranged around the axis (600). The reduction gear (3 1 1) is housed in the case (4) and decelerates and transmits the rotation of the motor (5). The motor (5) has a port motor (52) and a stator (53), and is located on one end side of the reduction gear (311) in the direction of the axis (600) in the case (4). The rotor (52) and the stator (53) are housed. The control board (35) is housed in the case (4) and controls the motor (5). The control board (35) is arranged at one end side of the reduction gear (311) in the direction of the axis (600).

According to the second aspect, the distance between the rotor (52) and the stator (53) and the control board (35) can be shortened. As a result, it is possible to reduce the length of the wiring that is connected between the port (5 2) and the stator (5 3) and the control board (3 5), and it is possible to reduce the power loss during power feeding through the wiring. Is reduced, and the drive efficiency of the motor (5) is improved. In addition, since the wiring becomes shorter, the cost of wiring is reduced, and the wiring is easier to crawl.

[0114] The third aspect can be realized by a combination with the first or second aspect. In the third aspect, the control board (35) has a control unit for controlling the motor (5).

[0115] According to the third aspect, a control board () having a control unit for controlling the motor (5) (

It is possible to shorten the distance between the 3 (5) and the mouth (5 2) and the stator (5 3).

[0116] The fourth aspect can be realized by a combination with the first or second aspect. In the fourth aspect, the control board (35) is provided with one of a switching element for supplying electric power to the motor (5) and a microcomputer.

[0117] According to the fourth aspect, a control board (3 5) on which any one of a switching element that supplies electric power to the motor (5) and a microcomputer is mounted, and a port (5 2 ) And the stator (53) can be shortened.

[0118] The fifth aspect is realized by a combination with any one of the first to fourth aspects. 〇 2020/175 524 26 卩 (: 170? 2020/007637

Can be done. In the fifth aspect, the motor unit (3) further includes a magnet (59) fixed to the outer peripheral surface of the mouth unit (52). The control board (3 5) is located between the stator (5 3) and the reduction gear (3 1 1) in the direction of the axis (600) and when viewed in the direction of the axis (600). 3) is arranged so as to overlap with the reduction gear (3 1 1) and magnet (59).

[0119] According to the fifth aspect, the change in the magnetic force due to the rotation of the mouth (52) increases.

[0120] The sixth aspect can be realized by a combination with the fifth aspect. In the sixth aspect, the control board (3 5) is arranged so as to overlap the stator (5 3) of the motor (5) and the reduction gear (3 1 1) when viewed in the direction of the axis (600). It

[0121] According to the sixth aspect, the control board (3 5) is arranged in the space between the motor (5) and the reduction gear (3 11) to effectively utilize this space. You can

[0122] The seventh aspect can be realized by a combination with the fifth aspect. In the seventh aspect, the control board (3 5) is arranged so as to overlap the rotor (5 2) of the motor (5) and the reduction gear (3 1 1) when viewed in the direction of the axis (600). It

[0123] According to the seventh aspect, by arranging the control board (35) in the space between the motor (5) and the reduction gear (311), the space can be effectively utilized. You can

[0124] The eighth aspect can be realized by a combination with any one of the first to seventh aspects. In the eighth aspect, the control board (35) has a mouth rotation detecting section (58) for detecting the rotation of the mouth (52).

According to the eighth aspect, the control board (35) can detect the rotation of the mouth (52).

[0126] The ninth aspect can be realized by a combination with the eighth aspect. In the ninth aspect, the mouth data rotation detecting section (58) detects a change in magnetic force due to the rotation of the mouth motor (52).

[0127] According to the ninth aspect, the magnetic force changes with the rotation of the mouth (52). 〇 2020/175 524 27 卩 (: 170? 2020/007637

At, the rotation of the mouth data (52) can be detected.

[0128] The tenth mode can be realized by combining with any one of the first to ninth modes. In the tenth aspect, the case (4) includes a first space (4 0 1) in which a mouth (5 2), a stay (5 3) and a control board (3 5) are arranged, and It has a second space (4 0 2) in which the gear (3 1 1) is arranged and a partitioning part (4 0 3) that partitions it into.

[0129] According to the tenth aspect, the partition (4 0 3) prevents the lubricating oil or grease that is lubricated in the tooth (5 4) from scattering and adhering to the control board (35). Will be suppressed.

[0130] The eleventh aspect can be realized by a combination with the tenth aspect. First

In the eleventh aspect, the control board (35) is arranged on the other end side opposite to the one end side of the stay (53) in the axis (600) direction.

[0131] According to the eleventh aspect, the control board (3 5) can be brought closer to the reduction gear (3 11), and particularly, the control board (3 5) can be brought closer to the reduction gear (3 11 1). ), it is easier to achieve further miniaturization when there is no need to keep away from

[0132] The 12th mode can be realized by a combination with the 10th mode. First

In the aspect of 12, the control board (35) is arranged on one end side of the stay (53) in the direction of the axis (600).

[0133] According to the 12th mode, the control board (3 5) can be kept away from the reduction gear (3 11), and particularly when the heat generation amount in the control board (3 5) is large, It is easy to improve the heat generation of the control board (3 5) by moving the control board (3 5) away from the reduction gear (3 1 1) that generates a large amount of heat.

[0134] The electric bicycle (1) according to the thirteenth aspect includes the motor unit (3) according to any one of the first to 12th aspects.

[0135] According to the thirteenth aspect, the electric bicycle (1) may have a short distance between the mouth plate (52) and the stator (53) and the control board (35). it can.

[0136] The motor unit (3) of the fourteenth aspect includes a case (4) and an input shaft body (6

0), output body (8), motor (5), reduction gear (3 1 1), control 〇 2020/175 524 28 卩 (: 170? 2020/007637

A substrate (35); The input shaft body (60) is arranged rotatably around the axis (600) through the case (4) in the direction of the axis (600). The output body (8) is rotatably arranged around the axis (600) along the outer peripheral surface of the input shaft body (60) and can be rotated by the rotational force of the input shaft body (60). The motor (5) is housed in the case (4) and has a rotating shaft (51), a rotor (52) that rotates integrally with the rotating shaft (51), and a stator (53). .. The reduction gear (3 1 1) is housed in the case (4) to reduce the speed of the motor (5) and transmit it. The control board (35) is housed in the case (4) and controls the motor (5). The port (52) is arranged between the reduction gear (3 1 1) and the control board (35) in the direction of the rotary shaft (5 1 ).

Explanation of symbols

[0137] 1 Electric bicycle

3 Motor unit

3 1 1 Reduction gear

35 Control board

4 cases

401 First Space

402 Second space

403 division

5 motor

52 mouth overnight

53 Stator

58 Rotor rotation detector

59 Magnet

60 input shaft

600 axis

Claims

〇 2020/175 524 29 卩 (: 170? 2020/007637 Claims

[Claim 1] A case,

An input shaft body that is arranged rotatably around the axis line through the case in the axial direction;

An output body that is rotatably arranged around the axis along the outer peripheral surface of the input shaft body, and that is rotatable by a rotational force of the input shaft body;

A motor having a rotor and a stator housed in the case; a deceleration gear housed in the case for decelerating and transmitting the rotation of the motor;

A control board that is housed in the case and that controls the motor;

The control board is arranged on one end side of the reduction gear in the axial direction,

The output body is arranged on the other end side of the input shaft body opposite to the _end side in the axial direction.

Motor unit.

[Claim 2] A case,

A deceleration gear housed in the case for decelerating and transmitting the rotation of the motor;

A motor in which a port and a stator are housed on one end side of the reduction gear in the axial direction in the case;

A control board that is housed in the case and that controls the motor;

The control board is arranged on the one end side of the reduction gear in the axial direction.

Motor unit. 〇 2020/175 524 30 boxes (: 170? 2020/007637

[Claim 3] The control board has a control unit for controlling the motor.

The motor unit according to claim 1 or 2.

4. The motor unit according to claim 1, wherein the control board is mounted with one of a switching element that supplies electric power to the motor and a microcomputer.

5. The control board is arranged between the motor and the reduction gear in the axial direction and so as to overlap with the motor and the reduction gear when viewed in the axial direction.

The motor unit according to any one of claims 1 to 4.

6. The control board is arranged so as to overlap the stator of the motor and the reduction gear when viewed in the axial direction.

The motor unit according to claim 5.

7. The control board is arranged so as to overlap the rotor of the motor and the reduction gear when viewed in the axial direction.

The motor unit according to claim 5.

[Claim 8] The control board has a rotor rotation detection unit for detecting rotation of the rotor.

The motor unit according to any one of claims 1 to 7.

[Claim 9] The rotor rotation detector detects the magnetic force of a magnet of the rotor.

The motor unit according to claim 8.

10. The case has a partition part that partitions the rotor, the first space in which the stator and the control board are arranged, and the second space in which the reduction gear is arranged.

The motor unit according to any one of claims 1 to 9.

[Claim 11] The control board is arranged on the other end side of the stator opposite to the one end side in the axial direction.

The motor unit according to claim 10. 〇 2020/175 524 31 卩(: 170? 2020/007637

12. The control board is arranged on the one end side of the stator in the axial direction.

The motor unit according to claim 10.

[Claim 13] An electric bicycle comprising the motor unit according to any one of claims 1 to 12.

[Claim 14] A case,

A motor that is housed in the case, has a rotating shaft, an opening that rotates integrally with the rotating shaft, and a stator;

A control board that is housed in the case and that controls the motor;

The rotor is arranged between the reduction gear and the control board in the direction of the rotation axis.

Motor unit.