Structure of vehicle power generating unit

Abstract

To secure compact layout of components composing a power generation unit and furthermore to enable vibration-proof effect of the power generation unit to be increased.SOLUTION: A power generation unit 10 has: a power generation engine 20; a power generator 30 to be a unit configuration component; and three mounts 51 to 53 for fitting the power generation engine 20 and the power generator 30 to an installation flat surface. The power generator 30 is arranged with its longitudinal direction being orthogonal to the longitudinal direction of a cylinder block 21 of the power generation engine 20. The power generation unit 10 has a first inertia main shaft 41 and a second inertia main shaft 42. The power generation engine 20 is arranged on the first inertia main shaft 41. The power generation engine 20 comprises the first mount 51. The power generator 30 is arranged on the second inertia main shaft 42. The power generator 30 comprises the second mount 52.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a structure of a vehicle power generating unit. [Background technology]

[0002] Known electric vehicles that have a battery for driving an electric motor include vehicles equipped with a small power generation unit, as disclosed in Patent Document 1. By installing such a power generation unit and supplying power to the battery or the electric motor, it is possible to extend the cruising range.

[0003] The power generating unit in the above example is removably mounted in a space provided in the lower rear part of the vehicle, for example. The power generating unit in this example has a power generating engine, a generator, and electrical equipment such as an inverter, all of which are housed inside a case.

[0004] By configuring the power generation unit to be removable from the vehicle body in this way, maintenance is improved and the power generation unit can be used independently in a location away from the vehicle. However, since installation space for such a power generation unit is limited, it is required to be configured more compactly and to have a predetermined cooling performance. For example, in Patent Document 1, each device is arranged so that the cooling path for cooling the generator engine and muffler and the cooling path for cooling the inverter, etc. intersect, making the power generation unit more compact while ensuring cooling performance. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-41834 Summary of the Invention [Problem to be solved by the invention]

[0006] In such a power generating unit, compactness and cooling performance depend heavily on the layout of the power generating unit's components. Meanwhile, the power generating engine and generator, which have a cylinder, crankshaft 24a, and a rotating shaft, vibrate during operation. Since vibrations from the power generating engine and generator can be transmitted to the vehicle interior, it is desirable to suppress them.

[0007] For example, in the structure of the above example, an attempt is made to suppress vibration by arranging the mount in a position where the cylinder of the generator engine and the generator are close to each other. However, because a more compact layout is required, the flexibility of mount placement is reduced. Therefore, there is room for improvement in the structure of the above example in terms of increasing the vibration-damping effect through mount placement.

[0008] The present invention has been made to solve the above-mentioned problems, and its object is to provide a structure for a vehicle power generation unit that can enhance the vibration-damping effect of the power generation unit while ensuring a compact layout of the components that make up the power generation unit. [Means for solving the problem]

[0009] To achieve the above object, the present invention provides a vehicle generator unit structure comprising: a generator engine, unit components other than the generator engine, a unit case detachably mounted to a vehicle while accommodating the generator engine and the unit components, a flat installation surface provided on the unit case on which the generator engine and the unit components are installed, and three mounts for mounting the generator engine and the unit components to the flat installation surface. In the vehicle generator unit structure, the unit components are arranged so that their longitudinal directions are perpendicular to the longitudinal direction of the cylinders of the generator engine, the generator unit has first and second principal axes of inertia, the generator engine is arranged on the first principal axis of inertia, the generator engine is provided with a first mount of the three mounts, the unit components are arranged on the second principal axis of inertia, and the unit components are provided with a second mount of the three mounts. [Effects of the Invention]

[0010] According to the present invention, it is possible to improve the vibration isolation effect of the power generation unit while ensuring a compact layout of the components that make up the power generation unit. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a plan view of a vehicle power generating unit according to the present invention; [Figure 2] 2 is a perspective view of the generator engine and generator of FIG. 1, as viewed from the front side of the unit. FIG. [Figure 3] FIG. 3 is a plan view of FIG. 2. [Figure 4] FIG. 3 is a side view of FIG. 2. [Figure 5] 3 is a plan view showing a modified example of the arrangement of the generator engine and the generator in FIG. 2. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, one embodiment of the structure of a vehicle power generating unit 10 according to the present invention will be described with reference to the drawings (Figs. 1 to 5). In the drawings, the direction of the arrow Fr indicates the front in the vehicle longitudinal direction (unit longitudinal direction). In the description of the embodiment, the "front (front end) and rear (rear end)" correspond to the front and rear in the vehicle longitudinal direction (unit longitudinal direction). Furthermore, the arrows R and L indicate the right and left sides when an occupant looks forward of the vehicle (when looking forward in the unit longitudinal direction). Furthermore, the arrow U indicates the upper side of the vehicle. In this embodiment, the up-down direction corresponds to the vehicle vertical direction as well as the vertical direction.

[0013] The power generation unit 10 for a vehicle according to this embodiment is detachably mounted, for example, under the floor of a luggage space or the like provided at the rear of the vehicle. Although not illustrated, the power generation unit 10 is inserted into the vehicle through an opening provided at the rear of the vehicle and fixed to the rear of the vehicle. In this case, the power generation unit 10 is disposed, for example, between the left and right rear wheels in the vehicle width direction, and is mounted to highly rigid rear side members and rear cross members that constitute the vehicle body frame.

[0014] The power generation unit 10 of this embodiment has a power generation engine 20 and a generator (unit component) 30, which are housed inside a substantially rectangular parallelepiped unit case (not shown). The power generation unit 10 also has three mounts, namely a first mount 51, a second mount 52, and a third mount 53, for attaching the power generation engine 20 and the generator 30 to a flat installation portion 12 provided on the bottom of the unit case.

[0015] In addition, although not shown in the figure, the power generation unit 10 also has other components such as a fuel tank filled with fuel for driving the power generation engine 20, a muffler through which exhaust gas emitted from the power generation engine 20 flows and which exhausts the exhaust gas outside the power generation unit 10, an inverter connected to the generator 30, a cooling fan that takes in air from outside the unit, cooling pipes through which coolant flows, and a radiator to which the cooling pipes are connected, all of which are arranged in close proximity within the unit case.

[0016] The unit case has a generally rectangular parallelepiped shape overall, and mounting portions (not shown) for mounting to a vehicle are provided on the outside of the unit case. The power generation unit 10 is mounted, for example, to the rear of the vehicle so that the longitudinal direction of the unit case is aligned with the vehicle width direction. In the following description, the longitudinal direction of the power generation unit 10 corresponds to the vehicle width direction and the left-right direction, and the short side direction of the power generation unit 10 corresponds to the front-to-rear direction of the vehicle. In this embodiment, the front and rear of the power generation unit 10 correspond to the front and rear of the short side direction (unit front-to-rear direction) of the power generation unit 10, and the left-to-right direction of the power generation unit 10 (unit width direction) corresponds to the left and right when the power generation unit 10 faces forward.

[0017] The unit case includes a tray 11 and a lid (not shown). The tray 11 includes a rectangular installation surface 12 on which the generator engine 20, the generator 30, etc. are installed, and side walls 13 that protrude upward from each end of the installation surface 12 and extend along the end. In this example, as shown in FIG. 1 , the side walls 13 protrude upward from the short sides of the installation surface 12 and extend along the short sides. The lid is box-shaped and covers the tray 11 from above, and is fixed to the side walls 13 of the tray 11. The longitudinal direction (long side direction) of the installation surface 12 corresponds to the unit width direction of the power generation unit 10, and the lateral direction (short side direction) corresponds to the unit front-to-rear direction of the power generation unit 10.

[0018] As shown in FIG. 1 , the flat installation surface 12 is provided with a mounting frame 14 for mounting components that make up the power generation unit 10. As shown in FIG. 1 , the mounting frame 14 includes a frame extending in the front-rear direction of the unit and a frame extending in the width direction of the unit. Although not shown in detail, the mounting frame 14 may be, for example, a square or rectangular plate. Providing the mounting frame 14 improves the surface rigidity of the flat installation surface 12, enabling the components of the power generation unit 10 to be more stably fixed. In this example, the mounting frame 14 located near the front end of the flat installation surface 12 extends widthwise along the front end, and a first mount 51 is fixed thereto. A substantially rectangular plate-shaped mounting frame 14 is located at the left corner of the front end, and a second mount 52 is fixed to the plate-shaped mounting frame 14.

[0019] As shown in Fig. 1, the generator engine 20 is installed on the flat installation portion 12 of the tray 11. In this example, it is located approximately in the center of the flat installation portion 12 in the left-right direction when viewed from above. The generator engine 20 has a cylinder block 21 in which a piston (not shown) is located, a cylinder head 22, a cylinder head cover 23, and a crankcase 24 that houses a crankshaft 24a. Although detailed illustration of the piston is omitted in this embodiment, the piston is housed inside the cylinder block 21 in a state where it extends in the front-rear direction of the unit, and reciprocates in the front-rear direction of the unit (the direction of arrow X in Fig. 3) when the generator engine 20 is driven.

[0020] As shown in Figures 2 and 3, the cylinder block 21 has a generally rectangular parallelepiped shape extending along the short sides (left and right sides) of the installation plane portion 12 (the front-to-rear direction of the unit). The cylinder block 21 also extends perpendicular to the longitudinal direction of the crankcase 24. The cylinder block 21 has a generally rectangular parallelepiped shape extending along the front-to-rear direction of the unit. A cylinder liner 21b is provided inside the cylinder block 21. The cylinder liner 21b is cylindrical and extends in the front-to-rear direction of the unit, and its approximate position is indicated by a dashed line in Figure 3. The piston is configured to reciprocate inside the cylinder liner 21b in the front-to-rear direction of the unit (the direction of arrow X in Figure 3) when the generator engine 20 is running.

[0021] Furthermore, a plurality of heat dissipation fins 21a are provided on the outer surfaces (e.g., the top, side, and bottom surfaces) of the cylinder block 21. The heat dissipation fins 21a protrude outward from the outer surfaces of the cylinder block 21 and extend in a direction perpendicular to the longitudinal direction of the cylinder block 21. For example, the plurality of heat dissipation fins 21a provided on the top surface of the cylinder block 21 protrude upward, extend in the unit width direction, and are spaced apart from one another in the unit front-to-rear direction. Similarly, the plurality of heat dissipation fins 21a provided on the side surfaces of the cylinder block 21 protrude in the unit width direction, extend vertically, and are spaced apart from one another in the unit front-to-rear direction. The cylinder block 21 is covered by a cylinder case (not shown), and cooling air flows within the cylinder case to cool the heat dissipation fins 21a.

[0022] As shown in Fig. 1, the crankcase 24 is disposed rearward of the cylinder block 21 and in approximately the center in the unit width direction in front of the installation plane 12 of the tray 11. The crankcase 24 extends in the unit width direction, and a crankshaft 24a extending in the unit width direction is disposed inside the crankcase 24. The approximate position of the crankshaft 24a is indicated by a dashed line in Fig. 3. The crankshaft 24a is connected to the pistons by connecting rods (not shown).

[0023] 1, the right end of the crankcase 24 is disposed so as to be continuous with the right side surface of the cylinder block 21, and the left end of the crankcase 24 is disposed further left than the left side surface of the cylinder block 21. In other words, the crankcase 24 and the cylinder block 21 are disposed in an L-shape in plan view.

[0024] The front wall of the crankcase 24 faces forward and extends in the unit width direction. A forward protrusion 25 to which a first mount 51 is attached is provided on the front wall. As shown in FIG. 2, a lower portion of the front wall protrudes forward more than an upper portion of the front wall. That is, a step is formed between the upper and lower portions of the front wall. The forward protrusion 25 is integrally provided on the front wall at a position adjacent to the lower side of the step and protrudes rearward from this position. A through-hole 25a penetrating vertically is provided in the front portion of the forward protrusion 25. A threaded shaft 51a (e.g., a bolt) provided on the first mount 51 passes through the through-hole 25a and is fastened with a nut or the like, thereby fixing the first mount 51 to the forward protrusion 25. As shown in FIG. 3, in this example, the through-hole 25a of the forward protrusion 25 is positioned to correspond to the left side surface of the cylinder block 21 in the unit width direction.

[0025] 2, a connecting part 40 that is connected to the generator 30 is disposed on the left end of the crankcase 24 in the unit width direction. The connecting part 40 has a plurality of bolt holes formed on the outer circumferential edge of the left end. As a result, the connecting part 40 connects the left end of the crankcase 24 and the right end of the generator 30 by fastening them with bolts.

[0026] The generator 30 is one of the unit components and is a heavy object having a predetermined weight. In this example, among the components that make up the power generation unit 10, the generator engine 20 and the generator 30 are components that are heavier than the other components. As shown in FIGS. 1 to 3 , the generator 30 is a device that extends in the unit width direction and is fixed to an installation plane portion 12 located on the left side of the crankcase 24 in the unit width direction. The generator 30 of this embodiment has a generator main body 31 and an installation bracket 35.

[0027] The generator body 31 is disposed on the left side of the crankcase 24 in the unit width direction, and the front end of the generator body 31 is disposed near the front end of the installation plane portion 12. A rotating shaft 30a extending in the unit width direction is disposed inside the generator body 31, and the rotating shaft 30a is connected to the left side of the crankshaft 24a. In this embodiment, the approximate position of the rotating shaft 30a is indicated by a dashed line in Figure 3. The generator 30 generates electricity when the rotating shaft 30a is rotated by driving the generator engine 20.

[0028] As shown in Fig. 2, a first bracket mounting portion 32 and a second bracket mounting portion 33 to which an installation bracket 35 is attached are provided at the rear of the generator body 31. The first bracket mounting portion 32 is located at the middle portion in the unit width direction at the front of the generator body 31, and in this example, is located approximately in the center of the generator body 31 in the unit width direction. The first bracket mounting portion 32 protrudes forward from the front of the generator body 31, and a bolt hole is formed in the front portion of the first bracket mounting portion 32. The bolt hole extends at a slight angle rearward as it extends downward.

[0029] 2, the second bracket mounting portion 33 is disposed at the left end portion of the front of the generator body 31. The second bracket mounting portion 33 protrudes forward from the left end portion of the front of the generator body 31, and two bolt holes extending in the unit width direction are formed at a distance from each other in the second bracket mounting portion 33. The installation bracket 35 is fixed to the generator body 31 with bolts threaded into the bolt holes of the first bracket mounting portion 32 and the second bracket mounting portion 33.

[0030] 2, the installation bracket 35 is a member for fixing the generator main body 31 to the installation plane portion 12, and is attached to the first bracket attachment portion 32 and the second bracket attachment portion 33 of the generator main body 31. The installation bracket 35 also has a base portion 36, a first support portion 37, and a second support portion 38.

[0031] The base portion 36 is disposed below the generator body 31 and has a horizontal portion 36a extending in the unit width direction and a front-rear portion 36b extending rearward from the left end of the horizontal portion 36a. The horizontal portion 36a and the front-rear portion 36b form an L-shape in plan view. A through-hole penetrating in the vertical direction is provided at the rear of the front-rear portion 36b. The first support portion 37 extends upward from the right end of the horizontal portion 36a. It extends upward from the right end, bends rearward, and extends at an angle rearward as it extends upward. A bolt hole is provided at the top of the first support portion 37, and the first support portion 37 is fastened to the first bracket mounting portion 32 with a bolt.

[0032] The second support portion 38 extends upward from the corner formed by the lateral portion 36a and the front-rear portion 36b. Two bolt holes are provided in the upper portion of the second support portion 38, and the second support portion 38 is fastened to the second bracket mounting portion 33 with bolts.

[0033] Here, the first mount 51 and the second mount 52 will be described. As shown in FIG. 2, the first mount 51 is disposed below the forward protrusion 25. In this example, the first mount 51 is a hexagonal prism when viewed from the front, and is provided with an elastic material such as rubber inside. The upper surface of the first mount 51 is provided with a threaded shaft 51a extending upward. The shaft 51a is inserted into a through-hole 25a provided in the forward protrusion 25, and the upper surface of the first mount 51 is fastened to the lower surface of the forward protrusion 25. The lower surface of the first mount 51 is attached to the upper part of the mounting frame 14, which is disposed near the front end of the installation plane 12. The forward protrusion 25 and the mounting frame 14 are connected via the first mount 51.

[0034] As shown in FIG. 2 , the second mount 52 is attached to the rear of the front-rear portion 36b of the base 36 of the installation bracket 35. The second mount 52 is a member similar to the first mount 51, and is hexagonal in front view. A threaded shaft 52a is provided on the upper surface facing upward. The shaft 52a passes through a through-hole in the front of the front-rear portion 36b of the base 36, and the upper surface of the second mount 52 is fastened to the lower surface of the front-rear portion 36b. The lower surface of the second mount 52 is attached to the upper part of the mounting frame 14, which is disposed near the front end of the installation plane 12. The base 36 and the mounting frame 14 are connected via the second mount 52. The first mount 51 and the second mount 52 are disposed at an interval in the unit width direction.

[0035] Next, the attachment of the third mount 53 will be described as shown in FIGS. 1 to 3. The rear wall of the crankcase 24 faces rearward and extends in the width direction of the unit. As described above, the cylinder block 21 is connected to the right side of the rear wall. The left side of the rear wall is provided with a rearward protruding portion 27 to which the third mount 53 is attached. The rearward protruding portion 27 protrudes rearward from the upper part of the right side of the rear wall. In this example, the rearward protruding portion 27 and the third mount 53 are arranged inside the bent portion of an L shape formed by the generator engine 20 and the generator 30.

[0036] A through-hole 27a that penetrates in the up-down direction is provided at the rear of the rear protruding portion 27, and a bolt or the like is inserted into the through-hole 27a to attach the third mount 53 to the rear of the rear protruding portion 27. Here, the through-hole of the rear protruding portion 27 is located slightly to the right of the through-hole 25a of the front protruding portion 25.

[0037] In this embodiment, a liquid-sealed mount in which a liquid is sealed is used for the third mount 53. The third mount 53 is cylindrical and extends in the vertical direction, and is provided at its upper part with a threaded shaft (not shown) that is inserted into the rearward protruding portion 27. The shaft passes through the through-hole 27a of the rearward protruding portion 27 and is fastened with a nut or the like, thereby fixing the third mount 53 to the rearward protruding portion 27. With the above configuration, the power-generating engine 20 and the generator 30 are attached to the mounting frame 14 of the installation plane portion 12 via the first to third mounts 51 to 53 in a state in which they have elastic properties.

[0038] Here, the positional relationship between the generator engine 20 and the generator 30 will be described. In this embodiment, as described above, the generator 30 is disposed so that its longitudinal direction is perpendicular to the longitudinal direction of the cylinder block 21. As shown in Fig. 3, the generator engine 20 and the generator 30 of the power generation unit 10 have two principal axes of inertia, namely, a first principal axis of inertia 41 and a second principal axis of inertia 42. In other words, these principal axes of inertia 41, 42 are set as axial directions that are primarily easy to rotate when the generator engine 20 and the generator 30 are combined into a single structure.

[0039] In this example, the first principal axis of inertia 41 passes through the first mount 51 and extends with an inclination to the left in the unit width direction as it moves rearward. In this example, as shown in Fig. 3, the first principal axis of inertia 41 is set to pass over the first mount 51 and extend with an inclination to the left in the unit width direction as it moves rearward. Furthermore, the second principal axis of inertia 42 is set to pass over the second mount 52 and extend with an inclination to the right in the unit width direction as it moves rearward. In this example, the generator engine 20 is disposed on the first principal axis of inertia 41, and the generator 30 is disposed on the second principal axis of inertia 42.

[0040] As described above, by disposing the first and second principal axes of inertia 41 and 42 on the first and second mounts 51 and 52, the power generation unit 10 can be effectively supported against vibrations applied parallel to the principal axes of inertia 41 and 42. Here, "parallel to the principal axes of inertia 41 and 42" means that the power generation unit 10, which is a structure, vibrates like a rigid body. For example, the power generation unit 10 may rotate about an axis relative to the first principal axis of inertia 41, or may rotate about an axis relative to the second principal axis of inertia 42, but vibrations as a rigid body are suppressed. As a result, the above arrangement makes it possible to enhance the vibration isolation effect of the power generation unit 10 while ensuring a compact layout of the components that make up the power generation unit 10.

[0041] In this embodiment, the connecting portion 40 that connects the generator engine 20 and the generator 30 to each other is disposed inside a triangle T defined by the first mount 51, the second mount 52, and the third mount 53, as shown in FIG. 1 . In this example, the triangle T has vertices at the center of the through-hole 25a of the forward protrusion 25, the center of the through-hole in the front-rear portion 36b of the base portion 36 of the installation bracket 35, and the center of the through-hole 27a of the rear protrusion 27. The connecting portion 40 includes a portion that is fastened with a bolt, and in this example, includes the bolts and bolt holes used for fastening, and is within the range of area Z indicated by the dashed line in FIG. 1 . It is sufficient that the bolts and bolt holes are disposed within the range inside the triangle T.

[0042] Furthermore, when the power generating unit 10 vibrates in the front-to-rear and up-to-down directions, a vibration mode occurs with the antinode at the connecting portion 40 between the generator engine 20 and the generator 30. In this vibration mode, stress is concentrated at the connecting portion 40, causing deformation in the vibration direction.

[0043] In contrast, in this embodiment, the parts that are prone to stress concentration and deformation are located within the triangle defined by the first to third mounts 51 to 53, so the load acting on the connecting part 40 can be shared and borne by the first to third mounts 51 to 53, resulting in effective vibration reduction. Furthermore, in this embodiment, the first to third mounts 51 to 53 have a damping function, so they have a certain effect of reducing elastic vibration modes in addition to the rigid vibration modes described above. This has the effect of reducing vibrations in higher frequency bands, making it possible to further improve quietness.

[0044] In this embodiment, as shown in FIG. 3 , the center of gravity G of the power generation unit 10 is located inside a triangle T defined by the first mount 51, the second mount 52, and the third mount 53 in a plan view. In this example, the center of gravity G is located in the area indicated by the dashed line in FIG. 3 . If the center of gravity G is located within the triangle T, the first to third mounts 51 to 53 can be used to effectively share and equalize the load. It is more effective to locate the center of gravity G of the power generation unit 10 close to the center of gravity of the triangle T. Note that when the power-generator engine 20 and the generator 30 are combined into a single structure, even if the center of gravity of the structure is located inside the triangle T defined by the first mount 51, the second mount 52, and the third mount 53, the load can still be effectively shared.

[0045] In this embodiment, as shown in FIGS. 1 and 3 , the first mount 51 and the third mount 53 are spaced apart from each other in the longitudinal direction of the cylinder block 21. They are spaced apart from each other in the longitudinal direction of the structure formed by the cylinder block 21, the cylinder head 22, and the cylinder head cover 23. In this example, the first mount 51 is located slightly to the right of the third mount 53, but the first mount 51 and the third mount 53 are arranged to partially overlap in a front view. In this example, the left end of the first mount 51 is located between the left and right ends of the third mount 53 in a front view. As shown in FIG. 3 , the range of the first mount 51 in the unit width direction is indicated by L1, and the range of the third mount 53 in the unit width direction is indicated by L3. The range indicated by L1 and the range indicated by L3 partially overlap.

[0046] When the engine is running, vibrations of the cylinder block 21 occur along the longitudinal direction of the cylinder block 21 toward the front and rear ends of the cylinder block 21. That is, the cylinder block 21 vibrates in the reciprocating direction of the pistons. For example, the cylinder block 21 vibrates in the reciprocating direction of arrow X shown in FIGS. 1 and 4. Because the first mount 51 and the third mount 53 are arranged overlapping each other in a front view as described above with respect to this vibration direction, the vibration-damping effect of the first and third mounts 51, 53 is further improved, making it possible to reduce vibrations.

[0047] In this embodiment, as shown in FIG. 4 , the cylinder block 21 is inclined away from the flat installation surface 12 from the longitudinal end closer to the crankshaft 24a toward the distal end. In this example, the cylinder block 21 is inclined upward toward the rear. The third mount 53 is disposed overlapping the cylinder block 21 and the cylinder head 22 in a plan view. In this example, a portion of the cylindrical portion of the third mount 53 is disposed below the cylinder block 21 and the cylinder head 21. That is, a portion of the third mount 53 is disposed between the flat installation surface 12 and the cylinder block 21 in the up-down direction. Because the cylinder block 21 is disposed at an incline as described above, the third mount 53 does not interfere with the cylinder block 21 or the cylinder head 22.

[0048] Because the cylinder block 21 is tilted as described above, it is possible to vertically distribute the load caused by vibration between the front and rear of the cylinder block 21. Furthermore, the tilt described above allows a gap to be formed between the cylinder block 21 and the installation surface 12, allowing the size and layout of the third mount 53 to be selected to the extent that a portion of the third mount 53 can overlap the cylinder block 21, thereby improving the design flexibility and compactness of the third mount 53. Furthermore, since it is necessary to increase the rigidity of the installation surface 12 near the L-shaped bend formed by the generator engine 20 and the generator 30, for example, the mounting frame 14 is disposed so as to intersect. Because the third mount 53 is disposed in this position, it is possible to improve the vibration-damping performance of the third mount 53.

[0049] 1 and 3, the second mount 52 is provided at the end of the generator 30 farther from the generator engine 20 and is disposed closer to the first mount 51 than the crankshaft 23a in the longitudinal direction of the cylinder block 21. That is, as shown in FIG. 1, the second mount 52 is provided at the left end of the generator 30 and is disposed closer to the first mount 51 than the crankshaft 23a in the unit front-rear direction. Furthermore, the second mount 52 is disposed so that the relationship α≧β is satisfied, where α is the distance between the crankshaft 24a and the second mount 52 in the unit front-rear direction and β is the distance between the second mount 52 and the first mount 51 in the unit front-rear direction. Here, in this embodiment, α represents the distance between the center of the crankshaft 24a and the center of the second mount 52, and β represents the distance between the center of the second mount 52 and the center of the first mount 51.

[0050] The main vibration source of the power generation unit 10 is the generator engine 20, but because the generator 30 is connected to the generator engine 20, vibrations from the generator engine 20 are easily transmitted to the generator 30. Furthermore, because the rotating shaft 30a of the generator 30 is connected to the crankshaft 24a and rotates together with the crankshaft 24a, vibrations from the generator engine 20 are easily transmitted to the generator 30, making it the second largest vibration source in the power generation unit 10 after the generator engine 20. In this embodiment, by arranging the second mount 52 as described above, the first mount 51 and the second mount 52 can support vibrations from the crankshaft 24a and the rotating shaft 30a on both axial sides, thereby further reducing vibrations caused by the generator engine 20.

[0051] Furthermore, since the distance β between the second mount 52 and the first mount 51 in the longitudinal direction of the unit and the distance α between the crankshaft 24a and the second mount 52 in the longitudinal direction of the unit satisfy the relationship α ≧ β, vibrations can be supported evenly on both sides in the axial direction, and the crankshaft 24a and the rotating shaft 30a are supported at approximately the same longitudinal distance, so that axial vibrations at the end of the generator 30 can be suppressed.

[0052] The description of the present embodiment is merely an example for explaining the present invention, and does not limit the invention described in the claims. Furthermore, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications are possible within the technical scope described in the claims.

[0053] In this embodiment, the unit component connected to the generator engine 20 is the generator 30, but is not limited to this. For example, a muffler, a radiator, etc. may also be used. Also, in this embodiment, the front-to-rear direction of the unit is described as corresponding to the longitudinal direction of the cylinder block 21 and also to the front-to-rear direction of the vehicle, but is not limited to this. For example, if the generator unit 10 is inserted from the side of the vehicle body or from the outer side in the width direction toward the inside, the longitudinal direction of the cylinder block 21 may be arranged so that the longitudinal direction of the cylinder block 21 corresponds to the vehicle width direction.

[0054] Furthermore, in this embodiment, the generator 30 is disposed on the left side of the crankcase 24, but this is not limiting. For example, as shown in Fig. 5, the generator 30 may be disposed on the right side of the crankcase 24. In this case, too, the center of gravity of the power generating unit 10 should be disposed inside the triangle T defined by the first to third mounts 51 to 53. [Explanation of symbols]

[0055] 10 Power Generation Units 11 Tray 12 Installation plane part 13 Side wall 14 Mounting frame 20. Generator engine 21 Cylinder block 21a Heat dissipation fin 21b Cylinder liner 22 Cylinder head 23 Cylinder head cover 24 Crankcase 24a crankshaft 25 Forward protrusion 25a through hole 27 Rear protrusion 27a Through hole 30 Generator (unit components) 30a Rotating shaft 31 Generator body 32 First bracket mounting portion 33 Second bracket mounting part 35 Installation bracket 36 Base 36a Lateral section 36b Anteroposterior section 37 1st support part 38 Second support part 40 Connection part 41 First principal axis of inertia 42 Second principal axis of inertia 51 First Mount 52 Second Mount 53 Third Mount

Claims

1. A structure of a vehicle generator unit having a generator engine, unit components other than the generator engine, a case that is detachably attached to a vehicle while accommodating the generator engine and the unit components, a flat installation surface that is provided on the case and on which the generator engine and the unit components are installed, and three mounts for attaching the generator engine and the unit components to the flat installation surface, the unit components are arranged so that their longitudinal direction is perpendicular to the longitudinal direction of the cylinder block of the generator engine; the power generation unit has a first principal axis of inertia and a second principal axis of inertia; the generator engine is disposed on the first principal axis of inertia, and a first mount of the three mounts is provided on the generator engine; A structure of a vehicle power generating unit, characterized in that the unit component is arranged on the second principal axis of inertia, and the unit component is provided with a second mount of the three mounts.

2. 2. The structure of a vehicle power generating unit as described in claim 1, characterized in that the generator engine is provided with a third mount of the three mounts, the generator engine and the unit component are provided with a connecting portion that connects them to each other, and the connecting portion is located inside a triangle defined by the first mount, the second mount, and the third mount in a plan view.

3. 3. The structure of a vehicle power generating unit as described in claim 2, characterized in that the center of gravity of the power generating unit is located inside a triangle defined by the first mount, the second mount, and the third mount in a plan view.

4. 4. The structure of a vehicle power generating unit according to claim 2, wherein the first mount and the second mount are arranged at an interval from each other in the longitudinal direction of the cylinder block.

5. the generator engine includes the cylinder block, a cylinder head provided at a longitudinal end of the cylinder block, and a crankshaft perpendicular to the longitudinal direction of the cylinder block; the cylinder block is inclined so as to move away from the installation plane from a longitudinal end closer to the crankshaft to a longitudinal end farther from the crankshaft, 5. The vehicle generator unit structure according to claim 2, wherein the third mount is disposed so as to overlap the cylinder block and the cylinder head in a plan view.

6. the generator engine has a crankshaft that is perpendicular to the longitudinal direction of the cylinder block, 5. A structure of a vehicle generator unit as described in any one of claims 1 to 4, characterized in that the second mount is provided at an end of the unit component farther from the generator engine and is positioned closer to the first mount than the crankshaft in the longitudinal direction of the cylinder block.

7. 7. The structure of a vehicle generator unit according to claim 1, wherein the unit component is a generator connected to the generator engine and generating electricity when driven by the generator engine.

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