Motor device

Abstract

To provide a motor device capable of easily changing a reduction gear ratio.SOLUTION: A two-wheel vehicle driving device 1 as the motor device in the embodiment includes a gear case 40, an electric motor part 2 supported by the gear case 40 and having a rotor shaft 9, an output shaft 50 supported by the gear case 40, a second sprocket 48 provided on the output shaft 50, a speed reduction mechanism 70 for transmitting the rotation of the rotor shaft 9 to the second sprocket 48 while reducing the speed thereof, and an inter-shaft adjusting mechanism 80 for adjusting an inter-shaft distance between the rotor shaft 9 and the output shaft 50.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a motor device. [Background technology]

[0002] In recent years, for example, motorcycles and the like have been developed that use motor devices as power sources instead of internal combustion engines such as internal combustion engines. Some motor devices include an electric motor unit and a reduction gear unit that reduces the rotation of the electric motor unit and outputs the reduced rotation. The reduction gear unit includes a gear case, an input gear attached to the motor shaft of the electric motor unit, and an output gear to which the rotation of the input gear is transmitted. The electric motor unit is fixed to the gear case. The output gear is rotatably supported by the gear case. The output gear is also connected to, for example, the rear wheel of the motorcycle via a drive belt. The reduction ratio between the input gear and the output gear allows the electric motor unit to be made smaller while still obtaining high output. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-90209 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, there are cases where the reduction ratio of the reduction unit is changed depending on the specifications of the motorcycle, etc. In this case, it is necessary to change the number of teeth of the input gear and the output gear, and therefore it is necessary to change the relative positional relationship between the input gear and the output gear in consideration of the meshing between the input gear and the output gear. However, in the above-mentioned conventional technology, since each gear is rotatably supported by a gear case, it is necessary to change the shape of the gear case, etc. As such, there is a problem in that it is difficult to easily change the reduction ratio of the motor device.

[0005] Therefore, the present invention provides a motor device that can easily change the reduction ratio. [Means for solving the problem]

[0006] In order to solve the above problems, in a first aspect of the present invention, a motor device includes a gear case, an electric motor supported by the gear case and having a motor shaft, an output shaft supported by the gear case, an output gear provided on the output shaft, a reduction mechanism that reduces the rotation of the motor shaft and transmits it to the output gear, and an axial distance adjustment mechanism that adjusts the axial distance between the motor shaft and the output shaft.

[0007] With this configuration, the distance between the motor shaft and the output shaft can be easily adjusted by the shaft distance adjustment mechanism, which makes it easy to change the reduction ratio of the reduction mechanism.

[0008] In a second aspect of the present invention, in the motor device of the first aspect, the inter-shaft adjustment mechanism comprises a slider that is slidably mounted on the gear case, and a fixing portion that fixes the slider to the gear case, and at least one of the motor shaft and the output shaft may be supported on the gear case via the slider.

[0009] By configuring it in this way, the structure of the inter-axis adjustment mechanism can be simplified, and manufacturing costs can be reduced.

[0010] In a third aspect of the present invention, in the motor device of the first or second aspect, the axis-to-axis adjustment mechanism may include a positioning portion that positions the slider.

[0011] This configuration allows the slider to be positioned easily and with high accuracy, which makes it possible to easily and with high accuracy adjust the distance between the motor shaft and the output shaft using the shaft distance adjustment mechanism.

[0012] According to a fourth aspect of the present invention, in the motor device of the third aspect, the positioning portion may include a positioning block provided on the gear case, and a position adjustment screw threaded into the positioning block.

[0013] By configuring it in this way, the configuration of the positioning portion can be simplified, and manufacturing costs can be reduced.

[0014] In a fifth aspect of the present invention, in the motor device of any one of the second to fourth aspects, the output shaft is supported on the gear case via the slider, and the inter-shaft adjustment mechanism may be formed on the gear case and formed long in a direction approaching or moving away from the motor shaft, and may have a recess into which the slider fits.

[0015] By configuring it in this way, the structure of the inter-axis adjustment mechanism can be further simplified, and manufacturing costs can be further reduced. [Effects of the Invention]

[0016] According to the present invention, the reduction ratio of the motor device can be easily changed. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view of an electric motorcycle according to an embodiment of the present invention. [Figure 2] 1 is a perspective view of a two-wheel vehicle drive device according to an embodiment of the present invention. [Figure 3] 1 is a cross-sectional view of a two-wheel vehicle drive device according to an embodiment of the present invention. [Figure 4] FIG. 2 is an enlarged perspective view of an inter-axis adjustment mechanism according to an embodiment of the present invention. [Figure 5] FIG. 2 is a perspective view of a tip end of a first arm in the embodiment of the present invention. [Figure 6] FIG. 2 is a perspective view of a slider according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] Next, an embodiment of the present invention will be described with reference to the drawings.

[0019] <Electric motorcycle> Fig. 1 is a perspective view of an electric motorcycle 100 equipped with a motorcycle driving device 1 as a motor device according to an embodiment of the present invention. Fig. 1 shows the rear part of the electric motorcycle 100.

[0020] As shown in Fig. 1, the two-wheeled vehicle drive device 1 is mounted on an electric two-wheeled vehicle 100 and drives a rear wheel 101 of the electric two-wheeled vehicle 100. The two-wheeled vehicle drive device 1 is disposed below a seat 103 for a rider provided on a vehicle body 102 and further forward in the direction of travel than the rear wheel 101. An external belt 104 is wound around a small diameter pulley 51 (described later) of the two-wheeled vehicle drive device 1 and an axle 101a of the rear wheel 101. In other words, the small diameter pulley 51 and the axle 101a of the rear wheel 101 are connected via the external belt 104. As a result, the power of the two-wheeled vehicle drive device 1 is transmitted to the rear wheel 101 via the external belt 104, and the electric two-wheeled vehicle 100 runs.

[0021] <Motorcycle drive unit> Fig. 2 is a perspective view of the two-wheel vehicle driving device 1. Fig. 3 is a cross-sectional view of the two-wheel vehicle driving device 1. As shown in Figures 2 and 3, the two-wheeled vehicle drive device 1 includes an electric motor unit 2 and a reduction unit 3 arranged alongside the electric motor unit 2 in the axial direction of the electric motor unit 2, which reduces the rotation of the electric motor unit 2 and transmits it to the rear wheel 101.

[0022] <Electric motor section> The electric motor unit 2 is a so-called outer rotor brushless motor. The electric motor unit 2 includes a stator 4 attached to the speed reducer 3, a rotor 5 rotatably mounted relative to the stator 4, a fan 18 mounted on the rotor 5, and a motor cover 22 that houses the stator 4, rotor 5, and fan 18. In the following description, the direction parallel to the axial direction of the electric motor section 2 (rotor 5) will be simply referred to as the axial direction.

[0023] <Stator> The stator 4 includes a cylindrical stator core 6, a plurality of teeth 7 protruding radially outward from the outer circumferential surface of the stator core 6, and excitation coils 8 wound around each tooth 7. The plurality of teeth 7 are arranged radially when viewed in the axial direction. The stator core 6 is fastened and fixed to the speed reducer portion 3 by bolts 110 .

[0024] <Rotor> The rotor 5 includes a rotor shaft (an example of a motor shaft in the claims) 9, a flywheel 10 attached to the rotor shaft 9, and a plurality of magnets 11 provided on the flywheel 10. One end 9a of the rotor shaft 9 on the side of the speed reducer 3 protrudes from the electric motor 2 toward the speed reducer 3. An external thread 9c is formed on the other end 9b of the rotor shaft 9 opposite to the one end 9a. A flywheel 10 is fastened and fixed to the external thread 9c.

[0025] <Flywheel> The flywheel 10 is made of a magnetic material and is formed in a cylindrical shape with a bottom that covers the stator 4 from the side opposite the speed reducer 3. That is, the flywheel 10 includes a disk-shaped bottom wall 12 that faces the stator 4 in the axial direction on the side of the stator 4 opposite the speed reducer 3, and a cylindrical peripheral wall 13 that protrudes inward in the vehicle width direction from the outer periphery of the bottom wall 12.

[0026] The bottom wall 12 is fastened to the male thread portion 9c of the rotor shaft 9. A fan 18 is provided on the bottom wall 12 on the side opposite to the stator 4. As a result, the fan 18 rotates integrally with the rotor 5. The peripheral wall 13 is disposed so as to surround the periphery of the stator core 6. A plurality of magnets 11 are disposed on the inner peripheral surface of the peripheral wall 13.

[0027] <Motor cover> The motor cover 22 is made of resin and is formed into a cylindrical shape with a bottom so as to cover the stator 4, rotor 5, and fan 18 from the axial side opposite the speed reducer 3. That is, the motor cover 22 includes a bottom wall 23 that faces the fan 18 in the axial direction, and a cylindrical peripheral wall 24 that protrudes from the outer periphery of the bottom wall 23 toward the electric motor 2.

[0028] An inclined portion 23a is formed on the outer periphery of the bottom wall 23. The inclined portion 23a is inclined so as to gradually extend toward the opening 22a of the motor cover 22 as it extends radially outward. A plurality of first case ventilation holes 26 are formed on the entire bottom wall 23 except for the inclined portion 23a. A plurality of second case ventilation holes 27 are formed on the motor cover 22 so as to straddle the inclined portion 23a of the bottom wall 23 and the peripheral wall 24. The second case ventilation holes 27 extend in the radial and axial directions. A plurality of third case ventilation holes 28 are formed on the opening 22a side of the peripheral wall 24. The third case ventilation holes 28 are formed along the axial direction. The end of the third case ventilation holes 28 on the opening 22a side is open.

[0029] A plurality of (for example, four in this embodiment) bolt seats 29 are formed on the outer peripheral surface of the peripheral wall 24 at the end on the opening 22a side. The bolt seats 29 are arranged at equal intervals in the circumferential direction. The bolt seats 29 are fastened and fixed to the speed reducer part 3 using bolts 30 and nuts 31.

[0030] <Deceleration part> The reduction section 3 includes a gear case 40, a reduction mechanism 70 provided in the gear case 40, an axis-to-axis adjustment mechanism 80 provided in the gear case 40, and an output shaft 50 supported on the gear case 40 via the axis-to-axis adjustment mechanism 80.

[0031] <Gear case> The gear case 40 includes a first arm 41 and a second arm 42 formed to be long in one direction, and a connecting support part 43 that connects one end of each of the arms 41 and 42 in the longitudinal direction. A mounting base 46 is integrally formed with the connecting support portion 43, protruding on the side opposite to the arms 41 and 42. The mounting base 46 is formed with an insertion hole 45a through which a bolt (not shown) is inserted.

[0032] The two arms 41, 42 are formed in a plate shape. The two arms 41, 42 are arranged opposite each other in the plate thickness direction via a connecting support part 43. In the following description of the speed reducer part 3, the direction perpendicular to the longitudinal direction and plate thickness direction of each arm 41, 42 is referred to as the short direction. A bifurcated first mounting base 44 is integrally formed with the first arm 41 at the tip end opposite the connecting support part 43. An insertion hole 44a through which a bolt (not shown) is inserted is formed in the first mounting base 44. The first mounting base 44 is used to fix the two-wheel vehicle drive device 1 to the vehicle body 102.

[0033] The stator 4 of the electric motor unit 2 and the bolt seat 29 of the motor cover 22 are fixed to a surface 41a of the first arm 41 opposite to the second arm 42. A bearing 55 is provided on the connecting support unit 43 side of the first arm 41. The rotor shaft 9 is rotatably supported on the first arm 41 via the bearing 55.

[0034] A bearing 61 is provided on the second arm 42 coaxially with the bearing 55 of the first arm 41. The rotor shaft 9 is rotatably supported on the second arm 42 via the bearing 61. In this manner, the rotor shaft 9 is rotatably supported on the gear case 40 by the two bearings 55, 61.

[0035] Two second mounting bases 45 are integrally formed with the second arm 42, closer to the tip end opposite the connecting support part 43 than the center in the longitudinal direction. The two second mounting bases 45 are disposed on both sides of the second arm 42 in the short direction. The second mounting bases 45 are formed with insertion holes 45a through which bolts (not shown) are inserted. The second mounting bases 45 cooperate with the first mounting base 44 to fix the two-wheel vehicle drive unit 1 to the vehicle body 102.

[0036] <Axle adjustment mechanism> Fig. 4 is an enlarged perspective view of the inter-axis adjustment mechanism 80. Fig. 5 is a perspective view of the tip of the first arm 41. Fig. 5 corresponds to Fig. 4. As shown in Figures 2 to 5, the inter-axis adjustment mechanism 80 mainly comprises guide recesses 84, 85 (first guide recess 84, second guide recess 85) formed at the tip end of the first arm 41 and the tip end of the second arm 42, a positioning portion 83, and sliders 81, 82 (first slider 81, second slider 82).

[0037] The first guide recess 84 formed in the first arm 41 is formed so as to open to the tip end of the first arm 41 and the surface 41a of the first arm 41. The first guide recess 84 is formed in a rectangular shape that is long in the longitudinal direction of the first arm 41 when viewed in the plate thickness direction of the first arm 41. In other words, the first guide recess 84 is formed in a rectangular shape that is long in the direction approaching and moving away from the rotor shaft 9 (connection support portion 43) when viewed in the plate thickness direction of the first arm 41.

[0038] That is, the first guide recess 84 has two long side inner surfaces 84a facing each other in the short direction of the first arm 41, a short side inner surface 84b connected to the two long side inner surfaces 84a on the rotor shaft 9 side, and a bottom surface 84c connected to these inner surfaces 84a, 84b on the second arm 42 side. An arm-side shaft insertion recess 88 is formed in the bottom surface 84c of the first guide recess 84, at the center in the short direction of the tip of the first arm 41. The arm-side shaft insertion recess 88 is formed between the tip of the first arm 41 and the center in the longitudinal direction of the first guide recess 84. The end of the arm-side shaft insertion recess 88 on the rotor shaft 9 side is formed in an arc shape.

[0039] The shape of the second guide recess 85 formed in the second arm 42 is also the same as that of the first guide recess 84. Therefore, the components of the second guide recess 85 are given the same reference numerals as those of the first guide recess 84, and description thereof will be omitted.

[0040] The positioning portion 83 is provided on each of the surface 41a of the first arm 41 and the surface 42a of the second arm 42 opposite to the first arm 41. The positioning portions 83 provided on each arm 41, 42 have the same configuration. Therefore, the following description will only focus on the positioning portion 83 provided on the first arm 41. The positioning portion 83 provided on the second arm 42 is given the same reference numeral as the positioning portion 83 provided on the first arm 41, and description thereof will be omitted.

[0041] The positioning portion 83 includes a positioning block 91 provided on the surface 41a of the first arm 41, and a position adjustment screw 92 threadedly engaged with the positioning block 91. The positioning block 91 is disposed on the rotor shaft 9 side (the connecting support portion 43 side) of the first guide recess 84. The positioning block 91 is formed in a rectangular parallelepiped shape that is long in the longitudinal direction of the first arm 41. A tip surface 91a of the positioning block 91 on the first guide recess 84 side and a short-side inner surface 84b of the first guide recess 84 are located on the same plane. A female thread portion 91b is formed on the tip surface 91a of the first guide recess 84. The position adjustment screw 92 threadedly engages with this female thread portion 91b.

[0042] The position adjustment screw 92 has a round bar-shaped male threaded portion 92a that screws into the female threaded portion 91b, and a head 92b provided at the axial end of the male threaded portion 92a. The head 92b of the position adjustment screw 92 protrudes toward the first guide recess 84. The protruding length of the position adjustment screw 92 from the positioning block 91 is adjusted by adjusting the amount by which the position adjustment screw 92 is tightened into the female threaded portion 91b.

[0043] FIG. 6 is a perspective view of the sliders 81 and 82. As shown in FIG. The two sliders 81, 82 have the same configuration. Therefore, in the following explanation, of the two sliders 81, 82, the first slider 81 provided on the first arm 41 will be mainly explained. The second slider 82 will be assigned the same reference numerals as the respective parts of the first slider 81, and detailed explanations thereof will be omitted. The second slider 82 will be explained as necessary.

[0044] As shown in FIGS. 4 and 6, the first slider 81 is slidably placed on the bottom surface 84c of the first guide recess 84. The first slider 81 is formed into an L-shape by, for example, pressing a metal plate. That is, the first slider 81 has a base plate 86 placed on the bottom surface 84c, and a rising plate 87 integrally formed on the rotor shaft 9 side (the connecting support portion 43 side) of the base plate 86. The rising plate 87 is bent and extends from the base plate 86 toward the opposite side to the second arm 42. The rising plate 87 abuts against a head 92b of the position adjustment screw 92.

[0045] The width of the first arm 41 in the short side direction of the base plate 86 (hereinafter simply referred to as the short side direction of the base plate 86) is the same as or slightly shorter than the width between the two long side inner surfaces 84a of the first guide recess 84. In other words, the first slider 81 is slidable in the direction toward and away from the rotor shaft 9 in accordance with the shape of the first guide recess 84.

[0046] A slider-side shaft insertion recess 86a is formed at the tip of the base plate 86 opposite to the rising plate 87. The slider-side shaft insertion recess 86a is disposed in the center of the base plate 86 in the short direction. The slider-side shaft insertion recess 86a is formed at a position corresponding to the arm-side shaft insertion recess 88. More specifically, the slider-side shaft insertion recess 86a is formed from the tip of the base plate 86 to the vicinity of the rising plate 87.

[0047] A width W1 of the slider-side shaft insertion recess 86a in the short side direction of the base plate 86 (hereinafter simply referred to as the width W1 of the slider-side shaft insertion recess 86a) is smaller than a width W2 of the arm-side shaft insertion recess 88 in the short side direction of the first arm 41 (see FIG. 5; hereinafter simply referred to as the width W2 of the arm-side shaft insertion recess 88). The slider-side shaft insertion recess 86a is formed in an arc shape. Both axial ends of the output shaft 50 are inserted into the arm-side shaft insertion recess 88 and the slider-side shaft insertion recess 86a.

[0048] <Output shaft> The output shaft 50 and the rotor shaft 9 are parallel to each other. The output shaft 50 is integrally formed with a shaft body 50a provided in most of the axial center and male threaded portions 50b formed at both axial ends of the shaft body 50a with reduced diameters via steps 50c. The outer diameter of the shaft body 50a is smaller than the width W2 of the arm-side shaft insertion recess 88 and larger than the width W1 of the slider-side shaft insertion recess 86a. Both axial ends of the shaft body 50a are inserted into the arm-side shaft insertion recess 88.

[0049] The outer diameter of the male thread portion 50b is equal to or slightly smaller than the width W1 of the slider-side shaft insertion recess 86a. The male thread portion 50b protrudes axially outward beyond the base plates 86 of the sliders 81 and 82 through the slider-side shaft insertion recess 86a. Flanged nuts 93 are threaded onto these protruding portions of the base plates 86 from above.

[0050] As a result, the output shaft 50 is fastened and fixed to each of the arms 41, 42 via the sliders 81, 82 and the flanged nut 93. In other words, the male thread portion 50b of the output shaft 50 and the flanged nut 93 function as fixing parts that fix the sliders 81, 82 to each of the arms 41, 42, respectively.

[0051] When the output shaft 50 is fastened and fixed to each arm 41, 42 via the sliders 81, 82 and the flanged nuts 93, the step 50c of the output shaft 50 abuts against the base plate 86 of the sliders 81, 82. This allows the output shaft 50 to be positioned relative to each arm 41, 42 via the sliders 81, 82. A part of the reduction mechanism 70 is attached between the two arms 41, 42 of the output shaft 50.

[0052] <Deceleration mechanism> The reduction mechanism 70 comprises a first sprocket 47 arranged between two bearings 55, 61 of the rotor shaft 9, a second sprocket (an example of an output gear in the claims) 48 rotatably supported on the output shaft 50 via two bearings 62a, 62b, and an inner chain 53 looped around the first sprocket 47 and the second sprocket 48.

[0053] The first sprocket 47 includes a first cylindrical portion 63 fitted onto the rotor shaft 9 and a toothed portion 64 formed on the outer peripheral surface of the first cylindrical portion 63. The inner chain 53 is wound around the toothed portion 64. The first cylindrical portion 63 is positioned in the axial direction by two collars 65a, 65b fitted onto the rotor shaft 9. The two collars 65a, 65b are arranged on both sides of the first cylindrical portion 63 in the axial direction. The toothed portion 64 is arranged at the end of the first cylindrical portion 63 on the first arm 41 side. The first sprocket 47 thus configured rotates integrally with the rotor shaft 9.

[0054] The two bearings 62a, 62b provided on the output shaft 50 are positioned in the axial direction by a split collar 66 fitted onto the output shaft 50. The split collar 66 includes a cylindrical central collar 67 located at the axial center of the output shaft 50, and two end collars 68 located on either side of the central collar 67 in the axial direction. The end collar 68 is integrally formed with an end cylindrical portion 68a that fits onto the output shaft 50, and an outer flange portion 68b that protrudes radially outward from the outer circumferential surface of the end cylindrical portion 68a.

[0055] The end cylindrical portion 68a is inserted into the arm-side shaft insertion recess 88. The outer diameter of the end cylindrical portion 68a is the same as or slightly smaller than the width W2 of the arm-side shaft insertion recess 88. The outer flange portion 68b abuts against the back surfaces 41b, 42b of the arms 41, 42, which face each other. This positions the end collar 68 in the axial direction. When the end collar 68 is positioned, the outer end surface of the end cylindrical portion 68a in the axial direction is located on the same plane as the bottom surfaces 84c of the guide recesses 84, 85. Therefore, the outer end surface of the end cylindrical portion 68a in the axial direction abuts against the base plate 86 of the sliders 81, 82.

[0056] Two bearings 62a, 62b are sandwiched between the end cylindrical portion 68a of the end collar 68 and the central collar 67. As a result, the two bearings 62a, 62b are axially positioned by the split collar 66. The second sprocket 48 is fitted onto the outer rings of these bearings 62a, 62b.

[0057] The second sprocket 48 includes a small diameter pulley 51 and a large diameter sprocket 52, which are arranged side by side in the axial direction. The small diameter pulley 51 includes a second cylindrical portion 75 into which the outer rings of the two bearings 62a, 62b are fitted, and a toothed portion 76 formed on the outer peripheral surface of the second cylindrical portion 75. An outer belt 104 is wound around the toothed portion 64.

[0058] The large diameter sprocket 52 is disposed at the end of the second cylindrical portion 75 on the first arm 41 side. The large diameter sprocket 52 includes a sprocket body 77 formed in a disk shape and teeth 78 formed on the outer periphery of the sprocket body 77. A through hole 77a is formed in the radial center of the sprocket body 77, through which the end cylindrical portion 68a of the end collar 68 is inserted. With the end cylindrical portion 68a inserted into this through hole 77a, the sprocket body 77 abuts against the end of the second cylindrical portion 75 on the first arm 41 side. The sprocket body 77 is fastened and fixed to the second cylindrical portion 75 with a plurality of bolts 111 (for example, four in this embodiment). This allows the large diameter sprocket 52 and the small diameter pulley 51 to rotate integrally.

[0059] The pitch diameter of the toothed portion 78 on the large sprocket 52 is larger than the pitch diameter of the toothed portion 64 on the first sprocket 47. In other words, the number of teeth of the toothed portion 78 on the large sprocket 52 is greater than the number of teeth of the toothed portion 64 on the first sprocket 47. The large sprocket 52 is disposed on the same plane as the tooth portion 64 of the first sprocket 47. The inner chain 53 is wound around the tooth portion 78 of the large sprocket 52. In other words, the first sprocket 47 and the large sprocket 52 of the second sprocket 48 are connected via the inner chain 53.

[0060] <Operation of two-wheel drive system> Next, the operation of the two-wheel drive device 1 will be described. When the electric motor unit 2 is driven, the first sprocket 47 rotates integrally with the rotor shaft 9. The rotation of the first sprocket 47 is transmitted to the large diameter sprocket 52 of the second sprocket 48 via the inner chain 53. The large diameter sprocket 52 and the small diameter pulley 51 rotate integrally relative to the output shaft 50.

[0061] Here, the number of teeth of the toothed portion 78 of the large diameter sprocket 52 is greater than the number of teeth of the toothed portion 64 of the first sprocket 47. Therefore, the second sprocket 48 (large diameter sprocket 52) ​​rotates at a reduced speed relative to the first sprocket 47. In this way, the speed reduction mechanism 70 reduces the rotation of the motor shaft 9 and transmits it to the second sprocket 48. The rotation of the second sprocket 48 is transmitted to the axle 101a of the rear wheel 101 via the outer belt 104, causing the electric motorcycle 100 to travel.

[0062] The reduction ratio of the reduction gear mechanism 70 can be adjusted by adjusting the number of teeth of the toothed portion 78 of the large diameter sprocket 52 and the number of teeth of the toothed portion 64 of the first sprocket 47. At this time, the pitch circle diameter of each toothed portion 78, 64 changes depending on the number of teeth. The distance between the central axis of the rotor shaft 9 and the central axis of the output shaft 50 (hereinafter referred to as the "axis distance") must be adjusted depending on the size of the pitch circle diameter of each toothed portion 78, 64. This axis distance adjustment is performed by the axis distance adjustment mechanism 80. The operation of the axis distance adjustment mechanism 80 will be described below.

[0063] <Axle distance adjustment mechanism operation> First, the flanged nut 93 that is threaded onto the male thread portion 50b of the output shaft 50 is loosened. This allows the sliders 81, 82 and the output shaft 50 to slide relative to the arms 41, 42. That is, the sliders 81, 82 and the output shaft 50 can move toward or away from the rotor shaft 9. In other words, the axial distance between the rotor shaft 9 and the output shaft 50 can be adjusted.

[0064] After adjusting the positions of the sliders 81, 82 and the output shaft 50 to predetermined positions, the tightening amount of the position adjustment screw 92 of the positioning portion 83 is adjusted. Then, the head 92b of the position adjustment screw 92 is brought into contact with the rising plate 87 of each slider 81, 82. This restricts the movement of each slider 81, 82 toward the rotor shaft 9. In other words, the positioning portion 83 positions each slider 81, 82. After adjusting the tightening amount of the position adjustment screw 92, the positioning of each slider 81, 82 may be performed by bringing the rising plate 87 of each slider 81, 82 into contact with the head 92b of the position adjustment screw 92.

[0065] Next, the flanged nut 93 is tightened onto the male thread portion 50b of the output shaft 50. This fixes the sliders 81, 82 and the output shaft 50 to the arms 41, 42. This completes the adjustment of the axial distance between the rotor shaft 9 and the output shaft 50.

[0066] As described above, according to the embodiment, the axial distance between the rotor shaft 9 and the output shaft 50 can be easily adjusted by the axial distance adjustment mechanism 80 of the two-wheel drive device 1. This allows the pitch circle diameter of each tooth portion 78, 64 to be changed, and the reduction ratio of the reduction mechanism 70 to be easily changed. The axial distance between the rotor shaft 9 and the output shaft 50 can always be set to an appropriate distance depending on the reduction ratio. Therefore, for example, by adjusting the circumferential length of the inner chain 53, the tension of the inner chain 53 can be kept constant. Therefore, there is no need to provide an idler gear or the like to keep the tension of the inner chain 53 constant.

[0067] The shaft distance adjustment mechanism 80 includes sliders 81, 82 slidably mounted on the arms 41, 42, respectively, and flanged nuts 93 that secure the sliders 81, 82 to the arms 41, 42. The output shaft 50 is supported on the arms 41, 42 via the sliders 81, 82. This configuration simplifies the configuration of the shaft distance adjustment mechanism 80 while allowing adjustment of the shaft distance between the rotor shaft 9 and the output shaft 50. The manufacturing cost of the shaft distance adjustment mechanism 80 can be reduced.

[0068] The shaft distance adjustment mechanism 80 includes a positioning unit 83 that positions the sliders 81 and 82. This allows the sliders 81 and 82 to be positioned easily and with high precision. This allows the shaft distance adjustment mechanism 80 to adjust the shaft distance between the rotor shaft 9 and the output shaft 50 easily and with high precision.

[0069] The positioning unit 83 includes a positioning block 91 provided on each arm 41, 42, and a position adjustment screw 92 threadedly engaged with the positioning block 91. With this configuration, the structure of the positioning unit 83 can be simplified, and the manufacturing cost of the positioning unit 83 can be reduced.

[0070] Guide recesses 84, 85 are formed in the arms 41, 42, respectively. The guide recesses 84, 85 are formed in a rectangular shape that is long in the direction approaching or moving away from the rotor shaft 9 when viewed in the thickness direction of the arms 41, 42. By fitting the sliders 81, 82 into such guide recesses 84, 85, respectively, the sliders 81, 82 are moved toward or away from the rotor shaft 9. This further simplifies the configuration of the shaft distance adjustment mechanism 80, reducing manufacturing costs. Moreover, the shaft distance between the rotor shaft 9 and the output shaft 50 can be easily and reliably adjusted via the sliders 81, 82.

[0071] The reduction gear mechanism 70 of the two-wheel drive device 1 can easily change the reduction ratio using the shaft distance adjustment mechanism 80, making it possible to contribute to Goal 7 of the United Nations-led Sustainable Development Goals (SDGs), which is to "Ensure access to affordable, reliable, sustainable and modern energy for all," and Goal 9, which is to "Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation."

[0072] The present invention is not limited to the above-described embodiment, and includes various modifications to the above-described embodiment without departing from the spirit of the present invention. For example, in the above embodiment, the electric motor section 2 is described as being used in a two-wheeled vehicle driving device 1. However, the present invention is not limited to this, and the configuration of the electric motor section 2 can be adopted in various devices.

[0073] In the above embodiment, the electric motor unit 2 is used as the rotating electric machine of the two-wheel vehicle driving device 1. However, this is not limiting, and the electric motor unit 2 may also be configured to be used as a generator. In the above embodiment, the two-wheel vehicle driving device 1 is described as including one electric motor unit 2. However, this is not limited to this, and the number of electric motor units 2 may be multiple. For example, an electric motor unit 2 may be disposed on each side of the rotor shaft 9 in the axial direction.

[0074] In the above embodiment, the reduction gear mechanism 70 has been described as including the first sprocket 47 provided on the rotor shaft 9, the second sprocket 48 rotatably supported on the output shaft 50, and the inner chain 53 wound around the first sprocket 47 and the second sprocket 48. The rotation of the second sprocket 48 is then transmitted to the axle 101a of the rear wheel 101 via the outer belt 104. However, the reduction gear mechanism 70 is not limited to this, and it is sufficient that the reduction gear mechanism 70 is able to reduce the rotation of the rotor shaft 9 and transmit it to the axle 101a of the rear wheel 101. For example, the reduction gear mechanism 70 may be composed of gears only.

[0075] In the above embodiment, the shaft distance adjustment mechanism 80 has been described as mainly composed of the guide recesses 84, 85 formed in the arms 41, 42, and the sliders 81, 82 slidably provided in the guide recesses 84, 85. The description has been given of a case in which the shaft distance between the rotor shaft 9 and the output shaft 50 is adjusted by moving the sliders 81, 82. However, the present invention is not limited to this, and the shaft distance adjustment mechanism 80 may be configured to adjust the shaft distance between the rotor shaft 9 and the output shaft 50.

[0076] For example, an elliptical spacer as viewed from the axial direction may be provided in each of the guide recesses 84, 85 instead of the sliders 81, 82. The position of the output shaft 50 may be adjusted by changing the mounting direction of this spacer. For example, the output shaft 50 may be provided with an eccentric portion that is eccentric from the axis of the output shaft, and the second sprocket 48 may be provided on this eccentric portion. In this case, the axial distance between the rotor shaft 9 and the output shaft 50 can be adjusted by changing the rotation angle of the output shaft 50.

[0077] In the above embodiment, the case where the output shaft 50 is supported by each of the arms 41, 42 via the shaft distance adjustment mechanism 80 (sliders 81, 82) has been described. However, this is not limited to this, and the rotor shaft 9 may be supported by each of the arms 41, 42 via the shaft distance adjustment mechanism 80 (sliders 81, 82). In this case, the entire electric motor unit 2 may be attached to each of the arms 41, 42 so as to move closer to or farther away from the output shaft 50. It is only necessary that at least one of the rotor shaft 9 and the output shaft 50 is supported by each of the arms 41, 42 via the shaft distance adjustment mechanism 80 (sliders 81, 82).

[0078] In the above embodiment, the gear case 40 includes two arms 41, 42 and a connecting support part 43 that connects these arms 41, 42. However, the present invention is not limited to this, and the shape of the gear case 40 can be determined arbitrarily. In the above embodiment, the positioning unit 83 of the inter-axis adjustment mechanism 80 includes the positioning block 91 provided on each of the arms 41, 42, and the position adjustment screw 92 threaded into the positioning block 91. However, the present invention is not limited to this, and the positioning unit 83 may be configured in any way as long as it can position the sliders 81, 82.

[0079] In the above embodiment, the male thread portion 50b of the output shaft 50 and the flanged nut 93 function as fixing portions that fix the sliders 81, 82 to the arms 41, 42, respectively. However, this is not limited thereto, and the fixing portions may be any fixing portions that can fix the sliders 81, 82 to the arms 41, 42, respectively. A fixing portion may be provided separately from the output shaft 50. A fixing lever, for example, may be used instead of the flanged nut 93. [Explanation of symbols]

[0080] 1... Motorcycle drive device (motor device), 2... Electric motor section (electric motor), 3... Reduction section, 4... Stator, 5... Rotor, 6... Stator core, 7... Teeth, 8... Excitation coil, 9... Rotor shaft, 9a... One end, 9b... Other end, 9c... Male thread section, 10... Flywheel, 11... Magnet, 12... Bottom wall, 13... Peripheral wall, 18... Fan, 22... Motor cover, 22a... Opening, 23... Bottom wall, 23a... Inclined section, 24... Peripheral wall, 26... First case ventilation hole, 27... Second case ventilation hole, 28... Third case ventilation hole, 29... Bolt seat, 30...bolt, 31...nut, 40...gear case, 41...first arm, 41a...surface, 41b...rear face, 42...second arm, 42a...surface, 42b...rear face, 43...connection support portion, 44...first mounting base, 44a...through hole, 45...second mounting base, 45a...through hole, 46...mounting base, 47...first sprocket, 48...second sprocket (output gear), 50...output shaft, 50a...shaft body, 50b...male thread portion (fixing portion), 50c...step, 51...small diameter pulley, 52...large diameter sprocket, 53...inner chain sprocket body, 77a...through hole, 78...tooth portion, 80...axial distance adjustment mechanism, 81...first slider, 82...second slider, 83...positioning portion, 84...first guide recess (recess), 84a...inner surface of long side, 84b ...inner surface of short side, 84c...bottom surface, 85...second guide recess (recess), 86...base plate, 86a...slider side shaft insertion recess, 87...rising plate, 88...arm side shaft insertion recess, 91...positioning block, 91a...tip surface, 91b...female thread portion, 92...position adjustment screw, 92a...male thread portion, 92b...head, 93...flanged nut (fixing portion), 100...electric motorcycle, 101...rear wheel, 101a...axle, 102...body, 103...seat, 104...outer belt, 110...bolt, 111...bolt

Claims

1. The gear case and an electric motor supported by the gear case and having a motor shaft; an output shaft supported by the gear case; an output gear provided on the output shaft; a reduction mechanism that reduces the rotation of the motor shaft and transmits the reduced rotation to the output gear; an axis distance adjustment mechanism for adjusting the axis distance between the motor shaft and the output shaft; Equipped with A motor device characterized by:

2. The inter-shaft adjustment mechanism includes: a slider slidably provided on the gear case; a fixing portion that fixes the slider to the gear case; Equipped with At least one of the motor shaft and the output shaft is supported by the gear case via the slider.

2. The motor device according to claim 1.

3. the inter-axis adjustment mechanism includes a positioning unit that positions the slider; 3. The motor device according to claim 2.

4. The positioning unit is a positioning block provided on the gear case; a position adjustment screw threadedly engaged with the positioning block; Including, 4. The motor device according to claim 3.

5. the output shaft is supported by the gear case via the slider, the shaft distance adjustment mechanism is formed in the gear case, is formed long in a direction approaching and moving away from the motor shaft, and has a recess into which the slider fits; 5. The motor device according to claim 2, wherein the first and second electrodes are electrically connected to each other.

Images