Drive device and vehicle

Abstract

The invention provides a driving device and a vehicle, which can easily process a hole for a ventilation path. A drive device is provided with: a center case having a partition wall; a motor cover having a motor housing chamber for housing a motor between the motor cover and the partition wall; a gear housing having a transmission mechanism housing chamber between the gear housing and the partition wall, the transmission mechanism housing chamber housing a transmission mechanism of the motor; a first ventilation path connected to the transmission mechanism housing chamber; and a second ventilation path connected to the motor housing chamber, in which the center housing is provided with a first hole portion continuous with a surface of the first ventilation path exposed to the outside of the center housing, and a second hole portion continuous with a surface of the second ventilation path exposed to the outside of the center housing. And a second hole portion that is continuous with a surface of the second ventilation path that is exposed to the outside of the center case, the first hole portion and the second hole portion being formed parallel to each other.

Description

Technical Field

[0001] The invention relates to a drive device and a vehicle. Background Art

[0002] In recent years, efforts toward the realization of a low-carbon society or a decarbonized society have been actively pursued, and research and development of electric drive devices are being conducted in order to reduce CO 2 emissions and improve energy efficiency in vehicles as well.

[0003] In such a drive device, the following structure is known: the drive device has: a gear housing having a speed reduction mechanism storage chamber for storing a speed reduction mechanism of an electric motor; and a motor housing, which is adjacent to the gear housing and has a motor storage chamber for storing an electric motor, and a ventilation hose is connected to the gear housing and the motor housing, respectively (for example, Patent Document 1). In the technology described in Patent Document 1, a hole portion opening to the side is provided relative to the gear housing, and the ventilation hose is connected to the hole portion, and a hole portion opening upward is provided relative to the motor housing, and the ventilation hose is connected to the hole portion.

[0004] [Prior art literature]

[0005] [Patent Document]

[0006] Patent Document 1: Japanese Patent No. 6972079 Summary of the invention

[0007] [Problems to be Solved by the Invention]

[0008] However, in the technology related to the electric drive device, the orientations of the plurality of openings to which the breather hose is connected are different, so hole processing may be laborious and time-consuming, and for example, the orientation of the housing must be changed to perform hole processing.

[0009] The present invention has been made in view of the above circumstances, and an object of the present invention is to facilitate the processing of holes for ventilation paths and to further contribute to the improvement of energy efficiency.

[0010] [Methods for solving the problem]

[0011] The present invention provides a drive device, which comprises: a central shell having a partition wall; a motor cover located on one of the left and right sides of the central shell, and having a motor storage chamber for storing the motor between the motor cover and the partition wall; a gear housing located on the other of the left and right sides of the central shell, and having a speed change mechanism storage chamber for storing the motor between the gear housing and the partition wall; a first ventilation path connected to the speed change mechanism storage chamber; and a second ventilation path connected to the motor storage chamber, wherein a first hole portion is provided in the central shell, the first hole portion is continuous with a surface of the first ventilation path exposed to the outside of the central shell, and a second hole portion is provided in the central shell, the second hole portion is continuous with a surface of the second ventilation path exposed to the outside of the central shell, and the first hole portion and the second hole portion are formed parallel to each other.

[0012] In addition, a vehicle is provided, which has a side stand, wherein the vehicle has the drive device, and the bottom surface of the recessed portion of the central shell that is recessed toward the inner side of the central shell is a horizontal surface when the side stand is in contact with the ground, or is an inclined surface inclined downwardly on the side opposite to the side where the side stand contacts the ground.

[0013] [Effects of the invention]

[0014] Hole processing for the ventilation path can be easily performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side view of the saddle-ride type vehicle according to the embodiment of the present invention.

[0016] Figure 2 It is a three-dimensional diagram of the swing arm.

[0017] Figure 3 It is the left side view of the swing arm.

[0018] Figure 4 It is the right side view of the swing arm.

[0019] Figure 5 yes Figure 1 Cross-sectional view of the swing arm at section AA.

[0020] Figure 6 This is a diagram showing the motor cut along a plane perpendicular to the motor axis and the surrounding structure.

[0021] Figure 7 Yes Figure 3 FIG. 5 is a diagram showing the speed reduction mechanism housing chamber in the BB cross section together with the surrounding structure.

[0022] Figure 8 Yes Figure 1 FIG. 1 shows a CC cross-section of the swing arm together with the surrounding structure.

[0023] Fig. 9 yes Figure 3 Cross-sectional view of the swing arm of the DD section.

[0024] Fig.10 Yes Figure 4 FIG. 5 shows a first fastening portion in cross section EE together with the surrounding structure.

[0025] Fig.11 This is a view showing the swing arm from the rear.

[0026] Fig.12 yes Fig.11 FF cross-sectional view.

[0027] Fig.13 yes Fig.11 GG cross-sectional view.

[0028] Fig.14 yes Fig.12 HH cross-sectional view.

[0029] Fig.15 This is a view showing the upper and lower extension walls of the ventilation casing and the surrounding structure from the front.

[0030] Fig.16 This is a diagram showing a cross section of a recessed portion and a surrounding structure from the rear.

[0031] Fig.17 This is a diagram showing the motor shaft together with the surrounding structure. DETAILED DESCRIPTION

[0032] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description, unless otherwise specified, the description of directions such as front, back, left, right, and up and down is the same as the direction relative to the vehicle body. In addition, the symbol FR shown in each figure indicates the front of the vehicle body, the symbol UP indicates the top of the vehicle body, and the symbol LH indicates the left side of the vehicle body.

[0034] Figure 1 It is a side view of the saddle-ride type vehicle 10 according to the embodiment of the present invention.

[0035] The saddle-riding vehicle 10 is an electric motorcycle, which includes a frame 11, an electric motor 12 that drives a rear wheel 15 as a driving wheel, a front fork 14 that supports a front wheel 13 so that it can be steered, a swing arm 16 that supports the rear wheel 15, a seat 17 for a passenger, and a body cover 18 that covers the frame 11.

[0036] The saddle-ride type vehicle 10 is a vehicle in which a passenger sits astride a seat 17. The saddle-ride type vehicle 10 of the present embodiment is a pedal-type electric two-wheeled vehicle including a low-floor footboard 19, a side stand 20a, and a center stand 20b.

[0037] The vehicle frame 11 includes a head pipe 21 provided at the front of the vehicle body, a down frame 22 extending rearward and downward from the head pipe 21 , left and right under frames 23 extending rearward from the down frame 22 , and left and right rear frames 24 extending rearward and upward from rear ends of the under frames 23 .

[0038] The footrest 19 is supported above the bottom frame 23 and is provided for a passenger seated on the seat 17 to place his / her feet.

[0039] The side stand 20a is rotatably supported on the underframe 23 on the left side, and can park the saddle-riding type vehicle 10 in a state of tilting to the left by contacting the ground in an upright state. The center stand 20b is rotatably supported on the underframe 23 behind the side stand 20a and in front of the rear wheel 15, and can park the saddle-riding type vehicle 10 in an upright state without tilting to the left or right by contacting the ground in an upright state. The center stand 20b is also called a main stand.

[0040] The front fork 14 is supported by the head pipe 21 so as to be steerable to the left and right. The front wheel 13 is supported by a front wheel shaft 13a formed by an axle provided at the lower end of the front fork 14. A steering handle 25 gripped by a rider is attached to the upper end of the front fork 14.

[0041] The swing arm 16 is connected to the rear end of the chassis 23 so as to be swingable up and down. The swing arm 16 has a hollow structure and accommodates the motor 12 for driving the rear wheel 15 at a position corresponding to the left side of the rear wheel 15. Thus, the swing arm 16 functions not only as a support member for supporting the rear wheel 15 but also as a drive device for driving the rear wheel 15.

[0042] The swing arm 16 can also be referred to as a swing-type power unit. A rear shock absorber 26 is inserted between the rear end of the swing arm 16 and the rear frame 24 .

[0043] Figure 2 It is a perspective view of the swing arm 16. Figure 3 is a left side view of the swing arm 16, Figure 4 It is a right side view of the swing arm 16. Figure 5 yes Figure 1 A cross-sectional view of the swing arm 16 in section AA. Figure 3 Symbol PR shown in the figure indicates the axis center of the rear wheel shaft 15a which is constituted by the axle of the rear wheel 15, symbol PC indicates the axis center of the intermediate shaft 71 which will be described later, and symbol PM indicates the axis center of the motor shaft 12a.

[0044] like Figures 2 to 5As shown in FIG. 1 , the swing arm 16 has a shape extending in a curved manner from the front of the rear wheel 15 toward the left side of the rear wheel 15. Figure 3 and Figure 4 As shown, a pivot insertion portion 41 for connecting to the vehicle frame 11 is provided at the front end portion of the swing arm 16 , and the motor 12 is accommodated at the left rear portion of the swing arm 16 .

[0045] like Figure 2 As shown, the swing arm 16 includes a motor housing 42, a gear housing 43 located inside the motor housing 42 in the vehicle width direction, and a motor cover 44 located outside the motor housing 42 in the vehicle width direction. Figure 5 As shown, a motor housing chamber 46 for housing the motor 12 is formed between the motor case 42 and the motor cover 44 , and a speed reduction mechanism housing chamber 47 for housing the speed reduction mechanism of the motor 12 is formed between the motor case 42 and the gear case 43 .

[0046] The motor housing 42 constitutes the majority of the swing arm 16 and integrally includes a plate-like side wall 51 ( Figure 4 , Figure 5 ), a cylindrical outer peripheral member 52 ( Figure 2 ), the extension parts 53 and 54 extending rearward from the side wall 51 and the peripheral member 52 ( Figure 2 ).like Figure 4 As shown, the side wall 51 constitutes an outer wall exposed to the inner side in the vehicle width direction of the swing arm 16 , and the above-mentioned pivot insertion portion 41 is integrally provided at the front portion of the side wall 51 .

[0047] The cylindrical outer peripheral member 52 of the motor housing 42 constitutes a part of the upper plate and the bottom plate of the swing arm 16. A plurality of internal threaded portions constituting a part of a plurality of connecting portions 60 connecting the motor housing 42 and the motor cover 44 are provided on the left side of the outer peripheral member 52. Figure 2 As shown, a plurality of fastening members 60 t penetrate the coupling portion 60 from the vehicle width direction outer side (left side) of the motor cover 44 and are fastened to the internal threaded portions of the motor case 42 , respectively, thereby coupling the motor case 42 and the motor cover 44 .

[0048] A recess 42H ( Figure 4 A ventilation housing 70 is mounted in the recessed portion 42H with a gap Sa in the up-down direction.

[0049] Furthermore, in the present embodiment, the motor case 42 , the gear case 43 , and the motor cover 44 are made of metal, but they may be made of materials other than metal.

[0050] like Figure 5 As shown, the side wall 51 of the motor case 42 extends between the motor housing chamber 46 and the speed reduction mechanism housing chamber 47 , and thus the side wall 51 functions as a partition wall that partitions the motor housing chamber 46 and the speed reduction mechanism housing chamber 47 .

[0051] The side wall 51 is provided with a motor support portion 55 that protrudes outward in the vehicle width direction in the motor storage chamber 46. The motor 12 is supported by the motor support portion 55. The motor 12 includes a motor shaft 12a (described later) extending in the vehicle width direction. Figure 7 ), a rotor 12r that rotates integrally with the motor shaft 12a, and a stator 12s located on the outer periphery of the rotor 12r. The motor 12 is an electric motor that uses a three-phase AC as a power source, and is called a three-phase motor or the like.

[0052] The motor 12 is mounted at a position separated outward in the vehicle width direction relative to the side wall 51 by the motor support portion 55. Thus, a wiring space is formed between the motor 12 and the side wall 51 for wiring a plurality of motor drive wires 12L1, which are relatively thick wires among a plurality of wires connected to the motor 12.

[0053] The side wall 51 is also integrally provided with a partition wall 56 that partitions the inner space of the motor case 42 into the motor housing chamber 46 and other spaces. The partition wall 56 protrudes in the vehicle width direction at a position forward of the motor 12 and extends to a position abutting against the motor cover 44.

[0054] Figure 6 This is a diagram showing the motor 12 cut along a plane perpendicular to the motor shaft 12 a and the surrounding structure.

[0055] like Figure 6 As shown, two wiring insertion holes 56a and 56b for passing a plurality of motor drive wires 12L are formed in the partition wall 56. A sealing ring 80 composed of a rubber cylindrical member is installed in each wiring insertion hole 56a and 56b. Each motor drive wire 12L1 is supported by the partition wall 56 through the central hole of each sealing ring 80. Since the sealing ring 80 is interposed between each wiring insertion hole 56a and 56b and the motor drive wire 12L1, the airtightness of the motor storage chamber 46 can be improved, and moisture, dust, etc. can be prevented from entering the motor storage chamber 46.

[0056] The seal ring 80 corresponds to the “intervention member” of the present invention. The intervention member of the present invention is not limited to the seal ring 80, and any member capable of filling the gap between the wiring insertion holes 56a, 56b and the motor drive wire 12L1 can be widely applied.

[0057] like Figure 5As shown, the motor cover 44 is connected to the motor case 42 from the outside in the vehicle width direction, and functions as a cover member that covers the motor storage chamber 46 in the motor case 42 from the outside in the vehicle width direction. The motor housing 46 is formed as a chamber closed from the outside space by the motor case 42 and the motor cover 44 including the partition wall 56.

[0058] The area of ​​the motor case 42 that is not covered by the motor cover 44 is covered by the swing arm cover 45 from the outer side in the vehicle width direction.

[0059] The motor cover 44 has a certain width in the vehicle width direction, and the internal space of the motor cover 44 also forms a part of the motor storage chamber 46. The motor 12 is separated from the motor cover 44 in the vehicle width direction, thereby forming a wiring 12L2 (excluding the motor drive line 12L1) for the plurality of wirings connected to the motor 12. Figure 5 ) through which the wiring passes.

[0060] The wiring 12L2 is connected to an angle sensor 100 ( Fig.17 ) is connected. However, the wiring 12L2 is not limited to the wiring connected to the angle sensor 100, and any wiring connected to any sensor or the like that detects information of the motor 12 may be used. In this way, wiring spaces for the wirings 12L1 and 12L2 connected to the motor 12 are respectively ensured on the inner side and the outer side of the motor 12 in the vehicle width direction.

[0061] The gear housing 43 is connected to the motor housing 42 from the inside in the vehicle width direction and has a speed reduction mechanism housing chamber 47 between the gear housing 43 and the side wall 51 of the motor housing 42. The speed reduction mechanism housing chamber 47 is surrounded by the gear housing 43 and the motor housing 42 and is sealed from the outside.

[0062] Figure 7 Yes Figure 3 The figure shows the speed reduction mechanism housing chamber 47 together with the surrounding structure in the BB section of FIG. The BB section is a section passing through the axis PM of the motor shaft 12a, the axis PC of the intermediate shaft 71, and the axis PR of the rear wheel shaft 15a.

[0063] like Figure 7As shown, in the speed reduction mechanism storage chamber 47, an intermediate shaft 71 and an output shaft also serving as the rear wheel shaft 15a are supported rotatably in parallel with the motor shaft 12a. The motor shaft 12a is the rotating shaft of the motor 12, and penetrates the side wall 51 of the motor housing 42. A first gear 12a that rotates integrally with the motor shaft 12a is provided in the speed reduction mechanism storage chamber 47. The intermediate shaft 71 has: a second gear 71a1 with a large diameter, which meshes with the first gear 12a1; and a third gear 71a2 with a small diameter, which rotates integrally with the second gear 71a1. The rear wheel shaft 15a has a fourth gear 15a1 with a large diameter that meshes with the third gear 71a2. By appropriately setting the number of teeth of each gear 12a, 71a1, 71a2, and 15a1, etc., a speed reduction mechanism is formed that reduces the rotation of the motor 12 at a predetermined speed reduction ratio and transmits it to the rear wheel shaft 15a.

[0064] The motor housing 42 is a housing located between the gear housing 43 and the motor cover 44 and located in the left and right center of the swing arm 16, and therefore can also be called a center housing. The gear housing 43 constitutes the right side portion of the swing arm 16, and therefore can also be called a right side housing and a left and right side housing. The motor cover 44 constitutes the left side portion of the swing arm 16, and therefore can also be called a left side housing and a left and right side housing.

[0065] Figure 8 Yes Figure 1 FIG. 1 shows the swing arm 16 together with the surrounding structure in the CC section. Figure 8 , reference symbol LC represents the vehicle width center of the saddle-ride type vehicle 10 .

[0066] The rear wheel shaft 15 a penetrates the gear housing 43 and protrudes inward in the vehicle width direction, and the rear wheel 15 is coupled to the protruding portion.

[0067] Oil for lubricating the speed reduction mechanism is poured into the speed reduction mechanism housing chamber 47. Since the speed reduction mechanism housing chamber 47 is separated from the motor housing chamber 46, the oil in the speed reduction mechanism housing chamber 47 can be prevented from flowing into the motor housing chamber 46.

[0068] The rear wheel 15 includes a wheel 15w and a tire 15t mounted on the wheel 15w. The wheel 15w includes a hub 15h disposed in the center, an annular rim 15r on which the tire 15t is mounted, and a spoke portion 15s composed of a plurality of spokes connecting the hub 15h and the rim 15r. In this structure, the swing arm 16 is a so-called cantilever type that exists only on one side (left side) of the rear wheel 15, and is easily accessible from the opposite side (right side) of the swing arm 16 relative to the rear wheel 15 and the swing arm 16.

[0069] In addition, the swing arm 16 of the present invention is not limited to the cantilever type, and may also be a double-support type.

[0070] Next, a fastening structure between the gear housing 43 and the motor housing 42 and a fastening structure between the motor cover 44 and the motor housing 42 will be described.

[0071] like Figure 4 As shown, a plurality of (four in this structure) fastening members 61t are fastened to the side wall 51 of the gear housing 43 from the inner side (right side) in the vehicle width direction. The area where these fastening members 61t are fastened is an area that is away from the speed reduction mechanism storage chamber 47 in the area that overlaps with the motor 12 when viewed from the width direction. The fastening structure of these fastening members 61t is the same structure, as shown in FIG. Figure 7 As shown, it has a bolt insertion portion 61s provided in the gear housing 43 and an internal thread portion 61m provided in the motor housing 42. Each fastening member 61t passes through the bolt insertion portion 61s and is fastened to the internal thread portion 61m, thereby fastening the gear housing 43 and the motor housing 42.

[0072] That is, the fastening member 61 t , the bolt insertion portion 61 s , and the internal thread portion 61 m function as a first fastening portion 61 that fastens the gear housing 43 and the motor housing 42 from the inner side in the vehicle width direction.

[0073] The first fastening portion 61 is configured to fasten the fastening member 61t from the opposite side of the motor 12, that is, from the right side in the vehicle width direction, so the fastening member 61t can be removed without removing the motor 12. Since the motor 12 does not need to be removed, it is easier to remove the gear housing 43 from the motor housing 42, or in other words, it is easier to release the fastened state of the gear housing 43 and the motor housing 42.

[0074] Furthermore, since these first fastening portions 61 are provided outside the speed reduction mechanism housing chamber 47, there is no need to remove components in the speed reduction mechanism housing chamber 47, and thus, the work of releasing the fastened state is also easy.

[0075] In addition, in this structure, if Figure 4 As shown, these first fastening portions 61 are arranged at intervals in the front and rear and in the upper and lower directions along the circumferential direction with the axis PR of the rear axle 15a as the center, so that the gear housing 43 and the motor housing 42 can be easily fastened with uniform fastening force based on the rear axle 15a.

[0076] like Figure 7 As shown, the fastening member 61t of the first fastening portion 61 is a stud bolt 61a and a cap nut 61b. The stud bolt 61a is also called an embedded bolt and has external threads at both ends, one of which is fastened to the internal thread 61m of the motor housing 42.

[0077] The external threaded portion of the front end side of the stud bolt 61a is fastened to the motor housing 42, and after the stud bolt 61a is passed through the bolt insertion portion 61s of the gear housing 43, the nut 61b is fastened to the external threaded portion of the base end side exposed to the outside from the bolt insertion portion 61s. According to this fastening structure, even if the nut 61b is loosened, the stud bolt 61a will not be loosened, and the first fastening portion 61 can be prevented from moving significantly to the inner side in the vehicle width direction, that is, to the rear wheel 15 side.

[0078] like Figure 3 As shown, the motor housing 42 is provided with extensions 53, 54 extending rearward from the motor cover 44 and overlapping the gear housing 43 in the vehicle width direction. A plurality (three in this embodiment) of fastening members 62t are fastened to the extensions 53, 54 from the vehicle width direction outer side (left side).

[0079] The fastening structures of these fastening members 62t are the same structure, such as Figure 7 As shown, it has a bolt insertion portion 62s provided in the motor housing 42 and an internal thread portion 62m provided in the gear housing 43. Each fastening member 62t passes through the bolt insertion portion 62s and is fastened to the internal thread portion 62m, thereby fastening the gear housing 43 and the motor housing 42.

[0080] The fastening member 62t is a bolt having an external threaded portion at one end and a large-diameter head at the other end, such as a flange bolt. The fastening member 62t, the bolt insertion portion 62s, and the internal threaded portion 62m function as a second fastening portion 62 for fastening the gear housing 43 and the motor housing 42 from the outside in the vehicle width direction.

[0081] The second fastening portion 62 is provided at a position away from the motor 12, so the fastening member 62t can be removed without removing the motor 12. Since the motor 12 does not need to be removed, it is easy to remove the gear housing 43 from the motor housing 42, that is, to release the fastened state between the gear housing 43 and the motor housing 42.

[0082] The second fastening portions 62 are also provided at intervals in the front-rear and the top-bottom directions along the circumferential direction about the axis PR of the rear axle 15a, so that the gear housing 43 and the motor housing 42 can be easily connected with uniform fastening force with the rear axle 15a as a reference.

[0083] like Figure 3 As shown, the rear end R1 of the motor housing 42 is located in front of the rear end R2 of the gear housing 43. Therefore, it is easy to arrange the second fastening portion 62 fastened from the motor housing 42 side at the front side, which makes it easy to shorten the front-to-rear length of the swing arm 16 and also contributes to the weight reduction of the swing arm 16.

[0084] Fig. 9 yes Figure 3 The gear housing 43 includes an extending portion 43R1 extending to the rear side of the swing arm 16 on the rear wheel 15 side and an opposing portion 43R2 opposing the extending portion 43R1 in the width direction of the swing arm 16 .

[0085] The extension portion 43R1 is located on the vehicle width direction outer side (left side) relative to a rear wheel brake (eg, a drum brake) connected to the rear wheel 15 and is a portion having a hole 43H through which a rod member for actuating the rear wheel brake passes.

[0086] All the first fastening portions 61 are provided at positions overlapping with the spoke portion 15 s of the rear wheel 15 in the vehicle width direction. Fig.10 Yes Figure 4 FIG. 5 is a diagram showing the first fastening portion 61 in cross section EE together with the surrounding structure.

[0087] like Fig.10 As shown, the spoke 15s is located inward in the vehicle width direction relative to the rim 15r of the rear wheel 15. The first fastening portion 61 is provided at a position overlapping with the spoke 15s of the rear wheel 15 in the vehicle width direction, so that the separation distance between the first fastening portion 61 and the rear wheel 15 can be efficiently ensured.

[0088] Next, the ventilation structure of the swing arm 16 will be described.

[0089] Fig.11 This is a diagram showing the swing arm 16 from the rear. Fig.12 Show Fig.11 FF cross-sectional view, Fig.13 Show Fig.11 GG cross-sectional view, Fig.14 Show Fig.12 HH cross-sectional view.

[0090] like Fig.12 As shown, the swing arm 16 has: a first ventilation path 81, which is connected to the speed reduction mechanism storage chamber 47 to connect the internal space of the speed reduction mechanism storage chamber 47 with the external air; and a second ventilation path 91, which is connected to the motor storage chamber 46 to connect the internal space of the motor storage chamber 46 with the external air.

[0091] like Fig.12 As shown, the first ventilation path 81 has a first hole portion 82 formed by perforating the motor housing 42. The first hole portion 82 is formed as a through hole that penetrates the concave portion 42H that is recessed downward toward the inside of the motor housing 42 in the up-down direction, thereby being continuous with the surface of the motor housing 42 that is exposed to the outside. Fig.13 In FIG. 8 , the central axis of the first hole portion 82 is represented by the reference symbol J1. Fig.13 2 shows a state where the ventilation housing 70 is removed.

[0092] The lower end of the first hole portion 82 communicates with the intersecting path 83 extending in the vehicle width direction corresponding to the direction intersecting the first hole portion 82. Fig.14 As shown, the cross path 83 is a hole protruding from the motor housing 42 toward the inside of the gear housing 43 in the vehicle width direction, and communicates with the speed reduction mechanism accommodation chamber 47. Thus, the speed reduction mechanism accommodation chamber 47 and the first hole portion 82 communicate with each other.

[0093] like Fig.12 As shown in the figure, by inserting one end of the first ventilation pipe 84 corresponding to the lower part in a straight tube shape into the first hole portion 82, the first ventilation path 81 extends upward from the recessed portion 42H. By inserting one end of the first ventilation duct 85 corresponding to the lower part into the other end of the first ventilation path 81, the opening end constituting the upper end of the first ventilation duct 85 is located above the first ventilation pipe 84. The first ventilation pipe 84 and the first ventilation duct 85 form an outlet path of the first ventilation path 81 extending to a position higher than the recessed portion 42H.

[0094] The second ventilation path 91 has a second hole 92 formed by perforating the motor housing 42. The second hole 92 is formed as a through hole that penetrates the recess 42H in the up-down direction at a position forward of the first hole 82, and is thus continuous with the surface of the motor housing 42 exposed to the outside. Fig.13 In FIG. 1 , the center axis of the second hole portion 92 is indicated by reference symbol J2.

[0095] like Fig.12 As shown, the lower end of the second hole portion 92 is connected to the motor storage chamber 46. By inserting the end of the second ventilation pipe 94 corresponding to the lower part in the straight tube shape into the second hole portion 92, the second ventilation path 91 extends upward from the recessed portion 42H. By inserting the end of the second ventilation duct 95 corresponding to the lower part at the other end of the second ventilation path 91, the open end constituting the upper end of the second ventilation duct 95 is located above the second ventilation pipe 94. The second ventilation pipe 94 and the second ventilation duct 95 form an outlet path of the second ventilation path 91 extending to a position higher than the recessed portion 42H.

[0096] The ventilation shell 70 has opposing surfaces M1 and M2 opposing the other ends of the first ventilation duct 85 and the second ventilation duct 95, and the distances α and β between the other ends of each ventilation duct 85 and 95 and the opposing surfaces M1 and M2 are shorter than the lengths γ and δ of the areas where the first ventilation pipe 84 and the second ventilation pipe 94 overlap with each ventilation duct 85 and 95 in the length direction of each ventilation pipe 84 and 94.

[0097] like Fig.12 and Fig.13 As shown, the first hole portion 82 and the second hole portion 92 are formed parallel to each other. Therefore, when the holes 82 and 92 are processed in the motor housing 42, the holes 82 and 92 can be processed without changing the orientation of the motor housing 42. In addition, for example, by making the hole diameters of the two holes 82 and 92 the same, the tools required for the hole processing can be made common.

[0098] Since the holes 82 and 92 are formed parallel to each other, the two holes 82 and 92 can be provided close to each other. In this structure, by providing the two holes 82 and 92 close to each other, the ventilation paths 81 and 91 can be compactly provided.

[0099] In this structure, if Fig.12 As shown, the speed reduction mechanism storage chamber 47 and the motor storage chamber 46 have an overlapping area Lap in the front-rear direction of the swing arm 16, and at least one of the first hole portion 82 and the second hole portion 92 is located in the area Lap. As a result, each ventilation path 81, 91 can be arranged at a position connected to each chamber 47, 46 at a short distance, and each ventilation path 81, 91 can be easily shortened.

[0100] Furthermore, since the first hole 82 and the second hole 92 are arranged in the front-rear direction by using the region Lap, the space in the width direction required for each ventilation path 81 , 91 can be compacted, which contributes to miniaturization of the swing arm 16 in the width direction and improvement of the appearance.

[0101] like Fig.12 As shown, the upper open ends of the first ventilation duct 85 and the second ventilation duct 95 are covered from above by the ventilation housing 70. The ventilation housing 70 has a gap between the ventilation ducts 85 and 95, and does not hinder the communication between the ventilation ducts 85 and 95 and the external space. Therefore, the closed speed reduction mechanism storage chamber 47 and the motor storage chamber 46 can always be connected to the external space through the ventilation paths 81 and 91, and the pressure increase in the speed reduction mechanism storage chamber 47 and the motor storage chamber 46 can be appropriately suppressed to maintain the state of atmospheric pressure.

[0102] The first ventilation pipe 84 and the first ventilation duct 85 form at least an outlet path of the first ventilation path 81, and the second ventilation pipe 94 and the second ventilation duct 95 form at least an outlet path of the second ventilation path 91. These outlet paths are covered from above by the ventilation housing 70, so that it is possible to prevent moisture, dust, mud, etc. (hereinafter referred to as "moisture, etc.") from flying objects from the surroundings from entering each ventilation path 81, 91.

[0103] More specifically, the ventilation housing 70 integrally includes: a cover 70a that covers the first ventilation path 81 from above; and upper and lower extension walls 70b that extend in the upper and lower directions on the left and right sides (in this embodiment, the right side corresponding to the inner side in the vehicle width direction) of the outlet path of the first ventilation path 81. The cover 70a can prevent moisture or the like from flying from above from entering the ventilation paths 81 and 91, and the upper and lower extension walls 70b can prevent moisture or the like from flying from the side from entering the ventilation paths 81 and 91.

[0104] Fig.15 This is a view showing the upper and lower extension walls 70 b of the ventilation casing 70 and the surrounding structure from the front.

[0105] like Fig.15 as well as Figure 8 As shown, the upper and lower extension walls 70b have facing surfaces 70c facing the rear wheel 15. The facing surfaces 70c can effectively prevent moisture or the like flying from the rear wheel 15 from entering the ventilation paths 81, 91.

[0106] When viewed in the front-rear direction of the swing arm 16 (equivalent to Fig.15 ), the facing surface 70c and the surface of the side wall 51 are located on the same plane, or the facing surface 70c is located at a position on the opposite side of the rear wheel 15 than the surface of the side wall 51. Therefore, the ventilation housing 70 and the rear wheel 15 can be fully separated.

[0107] In this structure, if Fig.13 As shown, the first hole portion 82 and the second hole portion 92 are provided in a recess 42H recessed toward the inside of the motor housing 42 , thereby shortening the length of the outlet path of each ventilation path 81 , 91 protruding from the motor housing 42 , which is beneficial to improving the appearance of the swing arm 16 .

[0108] In addition, if Fig.13 As shown, the motor housing 42 integrally has a housing side wall portion 42W that stands upward on the side of the recess 42H. The housing side wall portion 42W overlaps the open end of the outlet path of the ventilation path 81, 91 with a gap in the left-right direction, and overlaps the axial direction (equivalent to the central axis J1, J2) of the first hole portion 82 and the second hole portion 92 in the left-right direction. Therefore, the housing side wall portion 42W can prevent moisture and the like scattered from the side from entering each ventilation path 81, 91.

[0109] like Figure 4As shown in the figures, a gap Sa is provided between the recessed portion 42H and the lower end of the upper and lower extension walls 70b corresponding to the lower end of the ventilation housing 70, so that the water and the like on the recessed portion 42H can be smoothly discharged from the gap Sa, and it is possible to prevent the water and the like from accumulating in the recessed portion 42H and entering the ventilation paths 81, 91. In addition, the side wall 51 of the motor housing 42 has a side surface that is continuous with the recessed portion 42H and extends in the vertical direction of the swing arm 16, so that the water and the like from the recessed portion 42H can fall smoothly through the side surface.

[0110] Furthermore, since a portion of the breather housing 70 is positioned in the recessed portion 42H, the protruding length of the breather housing 70 from the motor housing 42 can be shortened, which contributes to improving the appearance of the swing arm 16 .

[0111] Fig.16 This is a diagram showing a cross section of the recess 42H and the surrounding structure from the rear. Fig.16 In FIG. 4 , reference numerals 42Ha and 42Hb respectively indicate the inclination of the bottom surface of the recessed portion 42H when the saddle-riding type vehicle 10 is inclined to the left and right in different directions. Fig.16 , remove the ventilation housing 70.

[0112] The inclination 42Ha of the bottom surface of the recessed portion 42H is when the saddle-riding type vehicle 10 is in an upright state. When the saddle-riding type vehicle 10 is in an upright state, the bottom surface of the recessed portion 42H becomes an inclined surface that is inclined downward toward the gear housing 43 side, and the water on the recessed portion 42H can be smoothly discharged toward the gear housing 43 side. Thus, the water on the recessed portion 42H can be discharged to the gap between the swing arm 16 and the rear wheel 15.

[0113] The inclination 42Hb of the bottom surface of the recessed portion 42H is when the saddle-riding type vehicle 10 is in a parking state with the side stand 20a in contact with the ground. In this case, the bottom surface of the recessed portion 42H becomes a horizontal surface. Even in the case of a horizontal surface, water and the like accumulated in the recessed portion 42H can be discharged, so the water and the like on the recessed portion 42H can be smoothly discharged to the outside of the recessed portion 42H.

[0114] In this way, in either the upright state or the parked state with the side stand 20a in contact with the ground, the water and the like on the recessed portion 42H can be discharged to the outside of the recessed portion 42H.

[0115] Furthermore, when the vehicle is parked with the center stand 20 b in contact with the ground, the saddle-ride type vehicle 10 is in an upright state, so that water and the like on the recessed portion 42H can be discharged to the outside of the recessed portion 42H.

[0116] In addition, the inclination of the bottom surface of the recessed portion 42H may be appropriately changed. For example, when the saddle-riding type vehicle 10 is in an upright state, the bottom surface of the recessed portion 42H may be a horizontal surface. In addition, when the side stand 20a is in contact with the ground while the vehicle is parked, the bottom surface of the recessed portion 42H may be an inclined surface that is inclined downwardly toward the side opposite to the side where the side stand 20a is in contact with the ground. In either case, the moisture on the recessed portion 42H can be discharged to the outside of the recessed portion 42H.

[0117] Other structures related to the electric motor 12 , the recessed portion 42H, the ventilation structure, etc. will be described.

[0118] Fig.17 This is a diagram showing the motor shaft 12a together with the surrounding structure.

[0119] like Fig.17 As shown, in the axial direction of the motor shaft 12a, an angle sensor 100 for detecting the rotation angle of the motor 12 is provided on the opposite side of the recess 42H in the motor shaft 12a with reference to the rotor 12r. The angle sensor 100 is connected to a wiring 12L2 wired between the motor 12 and the motor cover 44. The angle sensor 100 and the wiring 12L are arranged in a region away from the recess 42H, so it is easy to ensure a space for forming the recess 42H.

[0120] In addition, if Fig.13 As shown, when viewed along the axial direction of the motor 12, there is a surface MS (see FIG. 1 ) where the motor housing 42 and the gear housing 43 are in contact below the first hole 82 that passes through the recess 42H in the up-down direction. Fig.13 ). That is, the surface MS where the motor housing 42 and the gear housing 43 meet is located at a position lower than the recess 42H. Thus, the outlet path of the first ventilation path 81 can be provided in the area above the speed reduction mechanism storage chamber 47 and in the recess 42H, and the length of the outlet path of the first ventilation path 81 protruding from the motor housing 42 can be shortened.

[0121] In addition, if Fig.13 As shown, a surrounding wall 42K that surrounds at least a portion of the outer periphery of the motor 12 and supports the outer periphery of the motor 12 is provided in the motor housing chamber 46 corresponding to the inner side of the partition wall 56. Thus, it is easy to ensure a space for wiring the motor drive wire 12L1 between the partition wall 56 that supports the motor drive wire 12L1 via the sealing ring 80 and the surrounding wall 42K, and it is easy to connect the motor drive wire 12L1 to the motor 12.

[0122] In addition, if Fig.13 As shown, the motor drive line 12L1 connected to the motor 12 is wired at Fig.13The area MC is outside the specified area MC shown. The area MC is an area where the plane orthogonal to the motor shaft 12a and the recess 42H overlap when viewed from the axial direction of the motor 12. Since the motor drive wire 12L is arranged to avoid the area MC, it is possible to avoid the situation where the space for forming the recess 42H is restricted by the motor drive wire 12L. Therefore, it is also easy to ensure the space for forming the recess 42H.

[0123] Since a space for forming the recessed portion 42H can be ensured, the protruding length of the ventilation structure provided in the recessed portion 42H from the motor case 42 can be shortened, which contributes to improvement of the appearance of the swing arm 16 and the like.

[0124] As described above, in this embodiment, Figure 5 As shown, the swing arm 16 that functions as a driving device for the rear wheel 15 includes: a motor housing 42 having a side wall 51 that functions as a partition wall; a motor cover 44 that is located on one of the left and right sides of the motor housing 42 and has a motor storage chamber 46 between the motor cover 44 and the side wall 51; a gear housing 43 that is located on the other of the left and right sides of the motor housing 42 and has a speed reduction mechanism storage chamber 47 between the gear housing 43 and the side wall 51; a first ventilation path 81 that is connected to the speed reduction mechanism storage chamber 47; and a second ventilation path 91 that is connected to the motor storage chamber 46. Fig.13 As shown, a first hole portion 82 is provided on the motor housing 42, and the first hole portion 82 is continuous with the surface of the first ventilation path 81 exposed to the outside of the motor housing 42, and a second hole portion 92 is provided, and the second hole portion 92 is continuous with the surface of the second ventilation path 91 exposed to the outside of the motor housing 42, and the first hole portion 82 and the second hole portion 92 are formed parallel to each other.

[0125] According to this structure, since the first hole portion 82 and the second hole portion 92 are parallel to each other, the hole processing of the two hole portions 82 and 92 can be performed without changing the orientation of the motor housing 42. Therefore, the hole processing for the ventilation path can be easily performed, and an electric drive device that contributes to the improvement of energy efficiency can be provided.

[0126] In addition, if Fig.12 As shown, at least one of the first hole portion 82 and the second hole portion 92 is located in the region Lap where the speed reduction mechanism storage chamber 47 and the motor storage chamber 46 overlap in the front-to-back direction of the swing arm 16. According to this structure, the outlet path of each ventilation path 81, 91 can be arranged at a position connected to each chamber 47, 46 at a short distance, and each ventilation path 81, 91 can be easily shortened. In addition, by arranging the first hole portion 82 and the second hole portion 92 in the front-to-back direction using the region Lap, the space required for the outlet path of each ventilation path 81, 91 can be miniaturized in the width direction of the swing arm 16.

[0127] In addition, the first air path 81 has a cross path 83 extending in a direction intersecting the first hole portion 82 in the gear housing 43 adjacent to the motor housing 42. According to this structure, the first hole portion 82 of the first air path 81 can be close to the second hole portion 92 of the second air path 91. As a result, the workability of these holes 82 and 92 can be improved.

[0128] In addition, the present invention may be configured such that at least one of the first ventilation path 81 and the second ventilation path 91 is provided in the motor housing 42 and the adjacent housing in a direction intersecting the first hole 82 or the second hole 92 of the ventilation path of the motor housing 42. According to this configuration, the degree of freedom of the position of one or both of the first hole 82 and the second hole 92 is increased by the cross path, and these holes 82 and 92 can be brought close to improve the workability.

[0129] In addition, the ventilation housing 70 is provided to cover the first hole 82 and the second hole 92, and the ventilation housing 70 has a vertical extension wall 70b extending in the vertical direction on the left and right sides of the first hole 82 and the second hole 92. According to this structure, the ventilation housing 70 can prevent moisture and the like flying from the surrounding from entering each ventilation path 81, 91.

[0130] In the present embodiment, the upper and lower extension walls 70b are arranged on the inner side of the first hole portion 82 and the second hole portion 92 in the vehicle width direction, so that it is possible to effectively prevent moisture and the like scattered from the rear wheel 15 located on the inner side in the vehicle width direction from entering each ventilation path 81, 91. It should be noted that the upper and lower extension walls 70b may be arranged on the opposite side of the first hole portion 82 and the second hole portion 92, or may be arranged on at least one of the left and right sides of the first hole portion 82 and the second hole portion 92, and the position and shape of the upper and lower extension walls 70b may also be appropriately changed.

[0131] In addition, if Fig.12 As shown, the motor housing 42 has a recess 42H that is recessed toward the inside of the motor housing 42, and the first hole 82 and the second hole 92 are formed in the recess 42H. According to this structure, the length of the outlet path of each ventilation path 81, 91 protruding from the motor housing 42 can be shortened, which is conducive to improving the appearance and compactness of the swing arm 16.

[0132] In addition, if Fig.13 As shown, the motor housing 42 has a housing side wall portion 42W that stands upward on the side of the recessed portion 42H, and the housing side wall portion 42W overlaps the axial direction (equivalent to the central axis J1, J2) of the first hole portion 82 and the second hole portion 92 in the left-right direction. According to this structure, the housing side wall portion 42W can be used to prevent moisture and the like scattered from the side from entering each ventilation path 81, 91.

[0133] Since a gap Sa is provided between the recess 42H and the lower end of the ventilation housing 70 , water or the like that has entered the recess 42H can be smoothly discharged from the gap Sa. This can prevent water or the like that has accumulated in the recess 42H from entering the ventilation paths 81 , 91 .

[0134] In addition, since at least a portion of the breather housing 70 is located in the recess 42H, the protrusion length of the breather housing 70 from the motor housing 42 can be shortened, which contributes to improved appearance and compactness of the swing arm 16. Alternatively, the entire breather housing 70 may be located in the recess 42H.

[0135] In addition, if Fig.17 As shown, in the axial direction of the motor shaft 12a, which is the rotation axis of the motor 12, an angle sensor 100 for detecting the rotation angle of the motor 12 is provided on the opposite side of the recess 42H in the motor shaft 12a with reference to the rotor 12r. According to this structure, the space of the recess 42H is not restricted by the angle sensor 100, the wiring 12L connected to the angle sensor 100, and the like. Therefore, it is easy to ensure the space for forming the recess 42H. In addition, a sensor for detecting information other than the rotation angle of the motor 12 may be provided instead of the above-mentioned angle sensor 100 or in addition to the angle sensor 100.

[0136] In addition, if Fig.13 As shown, the contact surface MS between the gear housing 43 and the motor housing 42 is lower than the recess 42H when viewed in the axial direction of the motor 12. According to this structure, the outlet path of the first air path 81 can be provided in the area above the speed reduction mechanism storage chamber 47 and in the recess 42H.

[0137] In addition, if Figure 6 As shown, the motor housing 42 has a partition wall 56 that divides the internal space of the motor housing 42 into the motor storage chamber 46 and other spaces; wiring insertion holes 56a and 56b that are provided in the partition wall 56 and through which the motor drive line 12L1 connected to the motor 12 passes; and a sealing ring 80 that functions as an intervening component between the wiring insertion holes 56a and 56b and the motor drive line 12L1. According to this structure, the sealing ring 80 can be used to improve the airtightness of the motor storage chamber 46 to prevent moisture and the like from entering, and the second ventilation path 91 can be used to prevent the pressure in the motor storage chamber 46 from excessively increasing.

[0138] In addition, if Fig.13As shown, a surrounding wall 42K supporting the outer periphery of the motor 12 is provided between the partition wall 56 and the motor 12. According to this structure, a space for wiring the motor drive wire 12L1 can be ensured between the partition wall 56 supporting the motor drive wire 12L1 via the seal ring 80, the motor 12, and the surrounding wall 42K. As a result, the motor drive wire 12L1 and the motor 12 can be easily connected.

[0139] In addition, if Figure 4 As shown, the motor case 42 has a side surface (corresponding to the side surface of the side wall 51) that is continuous with the recessed portion 42H and expands in the vertical direction of the swing arm 16. Thus, water and the like from the recessed portion 42H can be smoothly dropped.

[0140] In addition, if Fig.16 As shown, the bottom surface of the recessed portion 42H is an inclined surface that is inclined downward toward the gear housing 43 side, so that water and the like on the recessed portion 42H can be smoothly discharged.

[0141] In addition, if Fig.15 and Figure 8 As shown, the swing arm 16 is disposed on the side of the rear wheel 15 of the saddle-ride type vehicle 10, and the upper and lower extension walls 70b of the ventilation housing 70 have facing surfaces 70c facing the rear wheel 15. According to this structure, water or the like flying from the rear wheel 15 side can be prevented from entering the ventilation paths 81, 91.

[0142] In addition, if Fig.15 As shown, the opposing surface 70c and the surface of the side wall 51 of the motor housing 42 are located on the same plane, or the opposing surface 70c is located at a position opposite to the rear wheel 15 than the surface of the side wall 51, so that the opposing surface 70c of the ventilation housing 70 can be fully separated from the rear wheel 15.

[0143] In addition, if Fig.12As shown, there are: a first ventilation pipe 84 and a second ventilation pipe 94, one ends of which are inserted into the first hole portion 82 and the second hole portion 92 respectively; and a first ventilation duct 85 and a second ventilation duct 95, one ends of which are inserted into the other ends of each ventilation pipe 84, 94, and the other ends are covered by the ventilation shell 70, the ventilation shell 70 has opposing surfaces M1, M2 opposite to the other ends of each ventilation pipe 85, 95, and the distances α, β between the other ends of each ventilation pipe 85, 95 and the opposing surfaces M1, M2 are shorter than the lengths γ, δ of the areas where the first ventilation pipe 84 and the second ventilation pipe 94 overlap with each ventilation pipe 85, 95 in the length direction of each ventilation pipe 84, 94. According to this structure, when each ventilation duct 85, 95 is offset upward from each ventilation pipe 84, 94, each ventilation duct 85, 95 contacts the opposing surfaces M1, M2 of the ventilation shell 70 before each ventilation duct 85, 95 is completely pulled out from each ventilation pipe 84, 94, thereby preventing each ventilation duct 85, 95 from falling off from each ventilation pipe 84, 94.

[0144] In addition, if Fig.16 As shown, the bottom surface of the recessed portion 42H is formed into a horizontal surface or an inclined surface inclined downwardly on the side opposite to the side where the side stand 20a contacts the ground when the side stand 20a contacts the ground. Thus, in the parking state using the side stand 20a, water and the like on the recessed portion 42H can be smoothly drained. In addition, when the bottom surface of the recessed portion 42H is set as an inclined surface inclined downwardly on the side opposite to the side where the side stand 20a contacts the ground, when the saddle-riding type vehicle 10 is in an upright state, the bottom surface of the recessed portion 42H becomes a nearly horizontal surface, and in this case, water and the like on the recessed portion 42H can also be drained.

[0145] The above-mentioned embodiment is only one mode of the present invention, and the present invention is not limited to the above-mentioned embodiment, and the structure of the details and the like may be modified as appropriate.

[0146] For example, the case where the speed reduction mechanism is housed in the gear housing 43 is illustrated, but a speed change mechanism not limited to speed reduction can also be housed. In addition, the structure of the speed change mechanism including the speed reduction mechanism can also be appropriately changed. In addition, the speed reduction mechanism housing chamber 47 in the gear housing 43 is equivalent to the "speed change mechanism housing chamber" of the present invention.

[0147] The fastening parts 61 and 62 may be provided with an appropriate fastening structure within the range that the above-mentioned effect of easily removing the gear housing 43 is obtained. The shapes of the motor housing 42, the gear housing 43, the motor cover 44, etc. may be appropriately changed.

[0148] In addition, the structure, shape, and position of each of the ventilation paths 81 and 91 may be appropriately changed within a range in which hole processing for the ventilation paths can be easily performed.

[0149] In addition, the present invention is applied to Figure 1 The present invention is not limited to the case of a two-wheeled motor vehicle shown in the figure, but it is not limited to this. The present invention can also be applied to any saddle-type vehicle and other vehicles. It should be noted that the saddle-type vehicle is not limited to a two-wheeled vehicle, and can also be a three-wheeled vehicle and a four-wheeled vehicle. In addition, the case where the present invention is applied to the drive device of the rear wheel 15 of the driving vehicle is described, but the present invention can also be applied to the drive device of the wheel other than the rear wheel 15, the present invention can also be applied to the drive device of the driven component other than the driving wheel, and the present invention can also be applied to the drive device of the driven component used in the device other than the driving vehicle.

[0150] [Structure supported by the above-mentioned embodiment]

[0151] The above-mentioned embodiment supports the following structure.

[0152] (Structure 1) A drive device, comprising: a central housing having a partition wall; a motor cover located on one of the left and right sides of the central housing, with a motor housing chamber for housing the motor between the motor cover and the partition wall; a gear housing located on the other of the left and right sides of the central housing, with a speed change mechanism housing chamber for housing the motor between the gear housing and the partition wall; a first ventilation path connected to the speed change mechanism housing chamber; and a second ventilation path connected to the motor housing chamber, wherein a first hole portion is provided in the central housing, the first hole portion is continuous with a surface of the first ventilation path exposed to the outside of the central housing, and a second hole portion is provided in the central housing, the second hole portion is continuous with a surface of the second ventilation path exposed to the outside of the central housing, and the first hole portion and the second hole portion are formed parallel to each other.

[0153] According to this structure, since the first hole and the second hole are parallel to each other, the hole processing of the two holes can be performed without changing the orientation of the central housing. Therefore, it is possible to provide an electric drive device that can easily process holes for the ventilation path and contribute to improving energy efficiency.

[0154] (Structure 2) The drive device according to Structure 1, wherein at least one of the first hole portion and the second hole portion is located in a region where the speed change mechanism housing chamber and the motor housing chamber overlap in the front-rear direction of the drive device.

[0155] According to this structure, the outlet path of each ventilation path can be arranged at a position connected to each chamber at a short distance, which makes it easy to shorten each ventilation path. In addition, by arranging each hole portion in the front-to-back direction using the overlapping area, the space required for the outlet path of each ventilation path can be miniaturized in the width direction of the swing arm.

[0156] (Structure 3) A driving device according to Structure 1 or 2, wherein at least one of the first ventilation path and the second ventilation path has a cross path, and the cross path extends in either the central shell or the adjacent shell in a direction intersecting with the first hole portion or the second hole portion of the ventilation path of either party.

[0157] According to this configuration, the intersecting paths increase the degree of freedom of the positions of one or both of the first hole and the second hole, and these holes can be brought closer together to improve workability.

[0158] (Structure 4) A driving device according to any one of Structures 1 to 3, wherein the driving device has a ventilation shell covering the first hole portion and the second hole portion, and the ventilation shell has an upper and lower extension wall extending in the upper and lower directions on at least one of the left and right sides of the first hole portion and the second hole portion.

[0159] According to this configuration, the ventilation case can prevent moisture or the like that flies in from the surroundings from entering each ventilation path.

[0160] (Structure 5) The driving device according to any one of Structures 1 to 4, wherein the center housing has a recessed portion recessed toward the inside of the center housing, and the first hole portion and the second hole portion are formed in the recessed portion.

[0161] According to this configuration, the length of the outlet path of each ventilation path protruding from the central case can be shortened, which contributes to the improvement of the appearance and compactness of the drive device.

[0162] (Structure 6) According to the drive device of Structure 5, the central shell has a shell side wall portion that stands upward on the side of the recessed portion, and the shell side wall portion overlaps the first hole portion and the second hole portion in the axial direction and the left-right direction.

[0163] According to this configuration, the casing side wall portion can suppress moisture or the like scattered from the side from entering each ventilation path.

[0164] (Structure 7) The driving device according to Structure 5 or 6, wherein the driving device has a ventilation housing covering the first hole portion and the second hole portion, and a gap is provided between the recessed portion and the lower end of the ventilation housing.

[0165] According to this configuration, the water or the like that has entered the recessed portion can be smoothly discharged from the gap, and the water or the like that has accumulated in the recessed portion can be suppressed from entering each ventilation path.

[0166] (Structure 8) The driving device according to any one of Structures 5 to 7 is characterized by having a ventilation housing covering the first hole portion and the second hole portion, and at least a portion of the ventilation housing is located in the recessed portion.

[0167] According to this structure, the protruding length of the ventilation housing from the center housing can be shortened, which contributes to the improvement of the appearance and the compactness of the drive device.

[0168] (Structure 9) A drive device according to Structure 5, wherein a sensor for detecting information of the motor is provided on the opposite side of the recess (42H) in the rotating shaft relative to the rotor of the motor in the axial direction of the rotating shaft of the motor.

[0169] According to this structure, the space of the recessed portion is not restricted by the sensor, wiring connected to the sensor, etc. Therefore, it is easy to ensure the space for forming the recessed portion.

[0170] (Structure 10) A drive device according to any one of Structures 5 to 9, wherein, when viewed along the axial direction of the motor, the surface of the gear housing in contact with the central housing is lower than the recess. According to this structure, the outlet path of the first ventilation path can be set using the area above the transmission mechanism storage chamber and in the recess.

[0171] (Structure 11) A driving device according to any one of Structures 1 to 10, wherein the driving device comprises: a partition wall which divides the internal space of the central shell into the motor storage room and other spaces; a wiring insertion hole which is arranged in the partition wall for the wiring connected to the motor to pass through; and an intervening component which is interposed between the wiring insertion hole and the wiring.

[0172] According to this configuration, the intervening member can improve the airtightness of the motor housing chamber to prevent moisture and the like from entering, and the second ventilation path can prevent the pressure in the motor housing chamber from excessively increasing.

[0173] (Structure 12) The drive device according to Structure 11, wherein a surrounding wall that supports the outer periphery of the motor is provided between the partition wall and the motor.

[0174] According to this configuration, a space for routing the wiring of the motor can be ensured between the partition wall, the motor, and the surrounding wall, and the wiring can be easily connected to the motor.

[0175] (Structure 13) The driving device according to any one of Structures 5 to 9, wherein the central housing has a side surface that is continuous with the recess and expands in the up-down direction of the driving device.

[0176] According to this configuration, water and the like can smoothly fall from the recessed portion through the side surface of the central casing.

[0177] (Structure 14) According to any one of Structures 5 to 9 and 13, the bottom surface of the recessed portion is an inclined surface inclined downward toward the gear housing side.

[0178] According to this structure, water and the like on the recessed portion can be smoothly discharged.

[0179] (Structure 15) According to the drive device of Structure 4, the drive device is arranged on the side of the wheel of the vehicle, and the upper and lower extension walls have opposing surfaces facing the wheel.

[0180] According to this configuration, it is possible to prevent moisture or the like that flies in from the wheel side from entering each ventilation path.

[0181] (Structure 16) A drive device according to Structure 15, wherein the central shell has a side wall extending in the up and down direction of the drive device, and the opposing surface is located on the same plane as the surface of the side wall, or the opposing surface is located on the opposite side of the wheel than the surface of the side wall.

[0182] According to this configuration, the facing surface of the breather casing and the wheel can be sufficiently separated from each other.

[0183] (Structure 17) A driving device according to Structure 4, wherein the driving device comprises: a ventilation pipe, one end of which is inserted into the first hole portion and the second hole portion respectively; and a ventilation duct, one end of which is inserted into the other end of the ventilation pipe and the other end of which is covered by the ventilation shell, the ventilation shell having an opposing surface opposite to the other end of the ventilation duct, and a distance between the other end of the ventilation duct and the opposing surface is shorter than a length of an area where the ventilation pipe overlaps with the ventilation duct in the longitudinal direction of the ventilation pipe.

[0184] According to this configuration, when each ventilation duct is displaced upward from each ventilation pipe, each ventilation duct contacts the facing surface of the ventilation case before each ventilation duct is completely pulled out from each ventilation duct, thereby preventing each ventilation duct from falling off from each ventilation pipe.

[0185] (Structure 18) A vehicle having a side stand, wherein the vehicle has a driving device according to any one of structures 5 to 9, 13, and 14, and the bottom surface of the recessed portion is formed so that the side stand is in contact with the ground. In the state, it is a horizontal surface, or an inclined surface inclined downward on the side opposite to the side where the side bracket contacts the ground.

[0186] According to this configuration, when the vehicle is parked with the side stand used, water and the like on the recessed portion can be drained smoothly.

[0187] Description of Reference Numerals

[0188] 10 Saddle-type vehicles

[0189] 11 Frame

[0190] 12 Electric Motor

[0191] 12r rotor

[0192] 12a Motor shaft

[0193] 12L1 Motor drive line (wiring)

[0194] 12L2 Wiring

[0195] 15 rear wheel

[0196] 16 Swing arm (drive device)

[0197] 20a Side bracket

[0198] 20b Central bracket

[0199] 42 Motor housing (central housing)

[0200] 42H concave part

[0201] 42W Shell side wall

[0202] 42K Wall

[0203] 43 Gear housing

[0204] 44 Motor cover

[0205] 46 Motor Storage Room

[0206] 47 Speed ​​reduction mechanism storage room (speed change mechanism storage room)

[0207] 51 side wall (next door)

[0208] 56 Partition wall

[0209] 56a, 56b Wiring insertion holes

[0210] 70 Vent housing

[0211] 70b Upper and lower extension walls

[0212] 70c Opposite side

[0213] 80 Sealing ring (intervention component)

[0214] 81 First ventilation path

[0215] 82 First hole

[0216] 83 Crossing Paths

[0217] 84 First ventilation pipe

[0218] 85 First ventilation duct

[0219] 91 Second ventilation path

[0220] 92 Second hole

[0221] 94 Second ventilation pipe

[0222] 95 Second ventilation duct

[0223] 100 Angle sensor (sensor)

Claims

1. A driving device, comprising: a central housing (42) having a partition wall (51); A motor cover (44) located on one of the left and right sides of the central housing (42), and having a motor storage chamber (46) for storing the motor (12) between the motor cover (44) and the partition wall (51); a gear housing (43) located on the other of the left and right sides of the central housing (42), and having a speed change mechanism storage chamber (47) for storing a speed change mechanism of the electric motor (12) between the gear housing (43) and the partition wall (51); a first ventilation path (81) connected to the transmission mechanism storage chamber (47); and a second ventilation path (91) connected to the motor storage chamber (46), in, A first hole portion (82) is provided in the central shell (42), and the first hole portion (82) is continuous with a surface of the first ventilation path (81) exposed to the outside of the central shell (42). A second hole portion (92) is provided in the central shell (42), and the second hole portion (92) is continuous with a surface of the second ventilation path (91) exposed to the outside of the central shell (42). The first hole portion (82) and the second hole portion (92) are formed parallel to each other.

2. The driving device according to claim 1, wherein: At least one of the first hole portion (82) and the second hole portion (92) is located in a region where the speed change mechanism housing chamber (47) and the motor housing chamber (46) overlap in the front-rear direction of the drive device.

3. The driving device according to claim 1, wherein: At least one of the first ventilation path (81) and the second ventilation path (91) has a cross path (83), and the cross path (83) extends in a direction intersecting with the first hole portion (82) or the second hole portion (92) of the ventilation path of either one of the central shell (42) and the adjacent shell.

4. The driving device according to claim 1, wherein: The driving device includes a ventilation housing (70) covering the first hole portion (82) and the second hole portion (92). The ventilation housing (70) has an upper and lower extension wall (70b) extending in the upper and lower directions in at least one of the first hole portion (82) and the second hole portion (92).

5. The driving device according to claim 1, wherein: The central housing (42) has a recess (42H) recessed toward the inner side of the central housing (42). The first hole portion (82) and the second hole portion (92) are formed in the recessed portion (42H).

6. The driving device according to claim 5, wherein: The central housing (42) has a housing side wall portion (42W) that stands upward on the side of the recess (42H), and the housing side wall portion (42W) overlaps the axial direction of the first hole portion (82) and the second hole portion (92) in the left-right direction.

7. The driving device according to claim 5, wherein: The driving device includes a ventilation housing (70) covering the first hole portion (82) and the second hole portion (92). A gap is provided between the recessed portion (42H) and the lower end of the ventilation housing (70).

8. The driving device according to claim 5, wherein: The driving device includes a ventilation housing (70) covering the first hole portion (82) and the second hole portion (92), and at least a portion of the ventilation housing (70) is located in the recessed portion (42H).

9. The driving device according to claim 5, wherein: A sensor (100) for detecting information of the motor (12) is provided in the axial direction of the rotating shaft (12a) of the motor (12) on the opposite side of the recess (42H) in the rotating shaft (12a) with reference to the rotor (12r) of the motor (12).

10. The driving device according to claim 5, wherein: When viewed along the axial direction of the electric motor (12), a surface of the gear housing (43) in contact with the center housing (42) is lower than the recessed portion (42H).

11. The driving device according to claim 1, wherein: The drive device has: a partition wall (56) which divides the inner space of the central housing (42) into the motor storage chamber (46) and other spaces; wiring insertion holes (56a, 56b) provided in the partition wall (56) for passing wiring (12L1, 12L2) connected to the motor (12); and An intervening component (80) is interposed between the wiring insertion holes (58a, 56b) and the wiring (12L1, 12L2).

12. The driving device according to claim 11, wherein: A surrounding wall (42K) supporting the outer periphery of the motor (12) is provided between the partition wall (56) and the motor (12).

13. The driving device according to claim 5, wherein: The central housing (42) has a side surface that is continuous with the recess (42H) and extends in the up-down direction of the drive device.

14. The driving device according to claim 5, wherein: The bottom surface of the recessed portion (42H) is an inclined surface that is inclined downward toward the gear housing (43) side.

15. The driving device according to claim 4, wherein: The driving device is arranged on the side of the wheel (15) of the vehicle. The upper and lower extension walls (70b) have opposing surfaces (70c) that are opposed to the wheels (15).

16. The driving device according to claim 15, wherein: The central housing (42) has a side wall (51) extending in the vertical direction of the driving device. The opposing surface (70c) and the surface of the side wall (51) are located on the same plane, or the opposing surface (70c) is located on the opposite side of the wheel (15) than the surface of the side wall (51).

17. The driving device according to claim 4, wherein: The drive device has: a vent pipe (84, 94), one end of which is inserted into the first hole portion (82) and the second hole portion (92), respectively; and A ventilation duct (85, 95), one end of which is inserted into the other end of the ventilation pipe (84, 94), and the other end of which is covered by the ventilation housing (70), The ventilation housing (70) has opposing surfaces (M1, M2) that are opposed to the other ends of the ventilation ducts (85, 95). The distance between the other end of the ventilation duct (85, 95) and the opposing surface (M1, M2) is shorter than the length of the ventilation duct (84, 94) in the longitudinal direction of the ventilation duct (84, 94) in the region where the ventilation duct (85, 95) overlaps.

18. A vehicle comprising a side stand (20a), wherein: The vehicle comprises a drive device (16) according to any one of claims 5 to 9, 13 and 14, The bottom surface of the recess (42H) is a horizontal surface when the side bracket (20a) is in contact with the ground, or is an inclined surface inclined downward on the side opposite to the side where the side bracket (20a) contacts the ground.

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