JP2018202934A - Method for manufacturing power unit and assembling jig for use in same method - Google Patents

Abstract

To suppress assembly failure of an end plate of a rotary electric machine.SOLUTION: A reference surface 55a of an assembling jig 50 is detachably attached to a plate upper attachment surface 21a of an engine block 21 in a surface abutment state. After an oil pan 25 is attached to the engine block 21 in the state that a plate lower attachment surface 25b of the oil pan 25 is not protruded from a reference surface 57a of the assembling jig 50, the assembling jig 50 is removed from the engine block 21. Thereafter, an end plate of a rotary electric machine is attached to the plate upper attachment surface 21a of the engine block 21 in the surface abutment state, and the end plate is attached to the plate lower attachment surface 25b of the oil pan 25.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method for manufacturing a power unit and an assembling jig used in the manufacturing method.

  For example, there is an industrial vehicle such as a forklift that drives an oil pump by a power unit including an engine (internal combustion engine) and a rotating electrical machine (see, for example, Patent Document 1). In the industrial vehicle, a rotor of a rotating electrical machine is connected to an engine crankshaft (output shaft), and a pump shaft of an oil pump is connected to the rotor of the rotating electrical machine. The oil pump is driven by an engine or a rotating electric machine, and generates hydraulic pressure for traveling and cargo handling. When the rotating electrical machine operates as a generator, the engine serves as a drive source for the rotating electrical machine and the oil pump. Further, when the rotating electrical machine operates as an electric motor, the rotating electrical machine serves as a drive source for the oil pump.

JP, 2006-001965, A

  In a power unit comprising an engine and a rotating electrical machine, after attaching an oil pan to the engine block of the engine, the end plate of the rotating electrical machine is attached to the engine block in a surface contact state, that is, in a surface contact state, and the end plate is attached to the oil pan. The manufacturing method may be adopted. In this case, as shown in FIG. 9, the end plate 131 has at least a plate upper mounting portion among a plate upper mounting surface 121 a formed on the engine block 121 and a plate lower mounting surface 125 b formed on the oil pan 125. It is necessary to hit the surface 121a. In FIG. 9, the code | symbol 122 shows the output shaft which is a crankshaft of an engine. In addition, the “engine block” referred to in the present specification refers to an integrated engine cylinder block and crankcase.

  Incidentally, the oil pan 125 is generally attached to the engine block 121 by bolt fastening. For this reason, the plate upper mounting surface 121a of the engine block 121 and the plate lower mounting surface 125b of the oil pan 125 may not be flush with each other due to dimensional errors, assembly errors, and the like. For example, as shown in FIG. 10, when the plate lower mounting surface 125 b of the oil pan 125 protrudes from the plate upper mounting surface 121 a of the engine block 121, the end plate 131 moves away from the engine block 121 and the oil pan 125. You ca n’t hit the face, and it ’s tilted. If the end plate 131 is bolted to the engine block 121 and the oil pan 125 in this state, an assembly failure of the end plate 131 occurs. Further, considering that the stator 133 of the rotating electrical machine is coaxially attached to the end plate 131 and the rotor 132 of the rotating electrical machine is coaxially attached to the output shaft 122 of the engine in a later process, the rotor 132 and the stator Axis misalignment occurs with respect to 133. For this reason, the accuracy of the air gap 132G between the rotor 132 and the stator 133 is lowered. That is, the difference (deviation) between the maximum value or the minimum value of the size in the radial direction of the air gap 132G and the average value increases.

  The problem to be solved by the present invention is to provide a method for manufacturing a power unit and an assembling jig used in the manufacturing method, which can suppress an assembly failure of an end plate of a rotating electrical machine.

  The above-described problems can be solved by the power unit manufacturing method of the present invention and the assembly jig used in the manufacturing method.

  According to a first aspect of the present invention, in a power unit including an engine and a rotating electrical machine, an oil pan is attached to the engine block of the engine, and then an end plate of the rotating electrical machine is brought into contact with a plate upper mounting surface formed on the engine block. A power unit manufacturing method, wherein the end plate is attached to a plate lower mounting surface formed on the oil pan, wherein the reference surface of the assembly jig is in contact with the plate upper mounting surface of the engine block. Attach the oil pan to the engine block in a state where the oil pan plate lower mounting surface does not protrude from the reference surface to the reference surface of the assembly jig. It is a manufacturing method of a power unit which removes the said assembly jig.

  According to the first invention, the reference surface of the assembly jig is detachably attached to the plate upper attachment surface of the engine block in a state of contact with the surface. Then, the oil pan is attached to the engine block with the lower surface of the oil pan attached to or close to the reference surface of the assembling jig. As a result, the upper plate mounting surface of the engine block and the lower plate mounting surface of the oil pan are flush with each other, or at least the lower plate mounting surface of the oil pan protrudes beyond the upper plate mounting surface of the engine block. An oil pan can be attached to the engine block without it. Thereafter, the assembly jig is removed from the engine block. Next, after attaching the end plate of the rotating electrical machine to the plate upper attachment surface of the engine block, the end plate may be attached to the lower plate attachment surface of the oil pan. Therefore, the end plate can be assembled without inclining so that at least the plate upper mounting surface of the engine block and the plate lower mounting surface of the oil pan are in contact with the plate upper mounting surface. Thereby, the assembly | attachment defect of the end plate of a rotary electric machine can be suppressed.

  The second invention is an assembling jig used in the method for manufacturing a power unit of the first invention, comprising a jig main body, and a jig mounting bolt capable of fastening the jig main body to the engine block. The jig main body is flush with a plate upper mounting surface of the engine block and is flush with a plate upper mounting surface of the engine block, and the oil pan plate lower mounting An assembly jig having a surface and a second reference surface that can contact the surface.

  According to the second invention, the jig body is fastened to the engine block with the jig mounting bolt in a state where the first reference surface of the jig body is brought into contact with the plate upper mounting surface of the engine block. The oil pan is attached to the engine block with the oil pan plate lower surface attached to the second reference surface of the jig body. As a result, the upper plate mounting surface of the engine block and the lower plate mounting surface of the oil pan should be flush with each other, or at least the lower plate mounting surface of the oil pan should not protrude beyond the upper engine plate mounting surface. it can. Thereafter, the jig body can be removed from the engine block by removing the jig mounting bolt from the engine block.

  In a third aspect based on the second aspect, the engine block has a plate mounting bolt hole in which a plate mounting bolt for mounting the end plate is tightened, and the jig mounting bolt is The assembly jig is provided so as to be capable of being fastened to the plate mounting bolt hole.

  According to the third invention, the plate mounting bolt hole of the engine block can also be used as the bolt hole of the jig mounting bolt. For this reason, it is not necessary to form a dedicated bolt hole corresponding to the jig mounting bolt in the engine block.

  According to the method for manufacturing a power unit of the present invention and the assembling jig used in the manufacturing method, it is possible to suppress defective assembly of the end plate of the rotating electrical machine.

It is a perspective view which shows the power unit concerning one Embodiment. It is a perspective view which decomposes | disassembles and shows a power unit. It is sectional drawing which cut | disconnected the peripheral part of the rotary electric machine by the XZ plane which passes along a rotating shaft line. It is a front view which shows the end plate attachment side in an engine. It is a perspective view which shows the relationship between an engine block, an oil pan, and an assembly jig. It is a front view which shows the attachment state of the assembly jig | tool in an engine. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 6. It is the schematic which shows the assembly | attachment process of the stator and rotor with respect to an end plate. It is the schematic which shows the assembly | attachment state of the end plate with respect to the engine block and oil pan concerning a prior art example. It is the schematic which shows the assembly | attachment defect state of an end plate.

  Hereinafter, an embodiment for carrying out the present invention will be described with reference to the drawings. In this embodiment, the power unit which drives the oil pump of industrial vehicles, such as a forklift, is illustrated. In addition, when the X axis, the Y axis, and the Z axis are described in the figure, the X axis, the Y axis, and the Z axis are orthogonal to each other, the Z axis direction indicates a vertically upward direction, and the X axis direction and the Y axis The axial direction indicates the horizontal direction, and the X axis indicates the direction parallel to the output shaft of the engine and the rotational axis of the rotor of the rotating electrical machine. FIG. 1 is a perspective view showing the power unit, FIG. 2 is an exploded perspective view showing the power unit, and FIG. 3 is a cross-sectional view of the periphery of the rotating electrical machine cut along an XZ plane passing through the rotation axis.

[Overview of power unit]
As shown in FIG. 1, the power unit 10 includes an engine 20 and a rotating electrical machine 30. The engine 20 includes an engine block 21, a cylinder head 23, a cylinder head cover 24, an oil pan 25, and the like. An output shaft 22 that is a crankshaft is rotatably supported on the engine block 21. For convenience, the X-axis direction parallel to the rotation axis 20x of the output shaft 22 of the engine 20 (the direction from the engine 20 toward the rotating electrical machine 30) is referred to as “front”, and the direction opposite to the X-axis direction is described as “rear”. I do.

  The cylinder head 23 is attached to the upper side of the engine block 21. The cylinder head cover 24 is attached to the upper side of the cylinder head 23. The oil pan 25 is attached to the lower surface side of the engine block 21. As shown in FIG. 3, one end portion (front end portion) of the output shaft 22 protrudes from the front side of the engine block 21 through a shaft hole 26 formed in the rear wall portion of the engine block 21. A seal member 27 that seals between the output shaft 22 and the shaft hole 26 is mounted in the shaft hole 26.

  As shown in FIG. 1, the rotating electrical machine 30 is disposed on the front side of the engine 20. The rotating electrical machine 30 includes an end plate 31, a rotor 32, a stator 33, an end cover 34, and the like (see FIG. 2). As shown in FIG. 2, the end plate 31 is formed in a substantially annular plate shape. On the outer peripheral portion of the end plate 31, a plurality of (eight in FIG. 2) protruding piece-like stator mounting portions 31 e that protrude radially outward at predetermined intervals in the circumferential direction are formed.

  The end plate 31 is attached to the front side of the engine 20 coaxially by bolt fastening. As shown in FIG. 3, the front end portion of the output shaft 22 is inserted into the hollow portion of the end plate 31. A structure for attaching the end plate 31 to the engine 20 will be described later.

  The rotor 32 integrally includes an inner shaft portion 32y and an outer shaft portion 32x that form an inner and outer double cylindrical shape. The inner shaft portion 32y is disposed in the rear end portion of the outer shaft portion 32x so that the rear end portion protrudes rearward from the outer shaft portion 32x. A flange portion 32a is formed at the rear end portion of the outer shaft portion 32x so as to protrude outward in the radial direction. A rotor core (not shown) and a permanent magnet 32m embedded in the rotor core are provided on the outer peripheral portion of the outer shaft portion 32x of the rotor 32.

  The rear end portion of the inner shaft portion 32y is attached by bolt fastening in a state of being fitted to the front end portion of the output shaft 22. Thereby, the rotor 32 rotates around the axis integrally with the output shaft 22. An annular plate-shaped foreign matter blocking plate 44 is coaxially provided on the front end surface of the outer shaft portion 32x. A short cylindrical peripheral cylinder portion 44 a that protrudes forward is formed at the outer peripheral end of the foreign matter blocking plate 44.

  As shown in FIG. 2, the stator 33 includes a hollow cylindrical cylindrical portion 33x, a rear flange portion 33c projecting radially outward from the rear end portion of the cylindrical portion 33x, and a diameter from the front end portion of the cylindrical portion 33x. A front flange portion 33d protruding outward in the direction. A plurality of projecting plate-like plate attachment portions 33e corresponding to the stator attachment portions 31e of the end plate 31 are formed on the outer peripheral portion of the rear flange portion 33c. On the outer peripheral portion of the front flange portion 33d, a plurality of (eight shown in FIG. 2) projecting piece-like cover mounting portions 33f that protrude radially outward at a predetermined interval in the circumferential direction are formed. As shown in FIG. 3, a plurality of stator cores 33v are provided at predetermined intervals in the circumferential direction on the inner peripheral surface of the cylindrical portion 33x. A stator coil 33a is wound around the stator core 33v.

  Each cover attachment portion 33f is attached to each stator attachment portion 31e of the end plate 31 by bolt fastening (see FIG. 1). Thereby, as shown in FIG. 3, the stator 33 is coaxially attached to the end plate 31. The inner peripheral surface of the stator iron core 33v is disposed opposite to the outer peripheral surface of the permanent magnet 32m of the rotor 32 via a so-called air gap 32G.

  As shown in FIG. 2, the end cover 34 is formed in a substantially annular plate shape. On the outer peripheral portion of the end cover 34, a plurality of projecting piece-shaped stator mounting portions 34e corresponding to the cover mounting portions 33f of the front flange portion 33d of the stator 33 are formed. At the inner peripheral end of the end cover 34, a labyrinth portion 34r having an annular U-shaped cross section is formed (see FIG. 3).

  Each stator attachment portion 34e of the end cover 34 is attached to each cover attachment portion 33f of the stator 33 by bolt fastening (see FIG. 1). Thereby, as shown in FIG. 3, the end cover 34 is coaxially attached to the front side of the stator 33. A rotor 32 is accommodated in an internal space formed by the end plate 31, the stator 33, and the end cover 34. The labyrinth portion 34r is fitted to the peripheral cylindrical portion 44a of the foreign matter blocking plate 44 with a predetermined gap. A labyrinth path that suppresses entry of foreign matter such as dust into the rotating electrical machine 30 is formed by the peripheral cylindrical portion 44 a of the foreign matter blocking plate 44 and the labyrinth portion 34 r of the end cover 34.

  An oil pump (only the pump cover 47 is shown in FIG. 3) is provided coaxially on the front side of the end cover 34. The pump cover 47 is formed in a conical cylinder shape. The large diameter side end of the pump cover 47 is attached to the end cover 34 by bolt fastening. Further, the pump shaft (specifically, the rear end portion) of the oil pump is coaxially connected to the front end portion of the outer shaft portion 32 x of the rotor 32 via a foreign matter blocking plate 44.

  Between the end plate 31 of the rotating electrical machine 30 and the inner shaft portion 32y of the rotor 32, a rotation sensor 36 called a resolver that detects the rotation angle (rotation position) of the rotor 32 is provided. The rotation sensor 36 includes a stator-side rotation detection unit 37 that is coaxially mounted on the front side of the end plate 31 and a rotor-side rotation detection unit 38 that is coaxially mounted on the outer periphery of the rear end of the inner shaft portion 32y. It consists of. A predetermined gap is formed between the stator side rotation detecting means 37 and the rotor side rotation detecting means 38. On the front side of the end plate 31, there is provided a position adjusting means 39 capable of adjusting the position of the stator side rotation detecting means 37 about the axis (see FIG. 2).

  In the power unit 10 described above, when the engine 20 is driven, the rotational power of the output shaft 22 is transmitted to the rotor 32. Further, when the rotating electrical machine 30 is driven, the rotational power of the rotor 32 is transmitted to the output shaft 22. As a result, the oil pump is driven by the engine 20 or the rotating electrical machine 30, and generates hydraulic pressure for traveling or cargo handling. When the rotating electrical machine 30 operates as a generator, the engine 20 serves as a drive source for the rotating electrical machine 30 and the oil pump. Moreover, when the rotary electric machine 30 operates as an electric motor, the rotary electric machine 30 becomes a drive source of the oil pump.

[Mounting structure of oil pan 25 to engine block 21]
FIG. 4 is a front view showing an end plate attachment side in the engine, and FIG. 5 is a perspective view showing a relationship among the engine block, the oil pan, and the assembly jig. As shown in FIG. 5, a number of oil pan mounting bolt holes 21 d are formed in the outer peripheral portion of the lower surface of the engine block 21. The oil pan mounting bolt holes 21d are arranged at predetermined intervals in the circumferential direction.

  The oil pan 25 is formed in a tank shape, and has a mounting flange portion 25a that protrudes outward at the peripheral edge of the upper end. The mounting flange portion 25a is formed with an oil pan mounting bolt insertion hole 25d corresponding to (aligning with) each oil pan mounting bolt hole 21d of the engine block 21.

  The oil pan 25 is fastened to the lower surface side of the engine block 21 by an oil pan mounting bolt 25e (see FIG. 4). That is, the oil pan mounting bolt 25e is fastened to each oil pan mounting bolt hole 21d via each oil pan mounting bolt insertion hole 25d.

[Attachment structure of end plate 31 to engine 20]
As shown in FIG. 4, on the front side of the engine block 21, a C-shaped plate upper mounting surface 21 a that surrounds the rotation axis 20 x of the output shaft 22 and opens downward is formed coaxially. The plate upper mounting surface 21 a is formed by a plane orthogonal to the rotation axis 20 x of the output shaft 22. A plurality of plate upper mounting bolt holes 21b (six are shown in FIG. 4) are formed in the plate upper mounting surface 21a. Each plate upper mounting bolt hole 21b is arranged at a predetermined interval in the circumferential direction. Further, pin holes 21c are respectively formed in the vicinity of the upper ends of the left and right plate upper mounting bolt holes 21b.

  On the front side of the oil pan 25, left and right plate lower attachment surfaces 25b are formed. Both plate lower mounting surfaces 25 b are arranged at both left and right end portions on the upper end side of the oil pan 25. Both plate lower mounting surfaces 25b are formed in a substantially square shape when viewed from the front. Both plate lower mounting surfaces 25b are arranged on the same plane.

  One plate lower mounting bolt hole 25c is formed on each of the plate lower mounting surfaces 25b. Both plate lower mounting bolt holes 25c are arranged in an annular arrangement with each plate upper mounting bolt hole 21b in a state where the oil pan 25 is mounted to the engine block 21.

  The rear side surface of the end plate 31 is a mounted surface 31a formed by a plane orthogonal to the axis (see FIG. 3). As shown in FIG. 2, the end plate 31 has plate mounting bolts corresponding to (aligned with) the plate upper mounting bolt holes 21 b of the engine block 21 and the plate lower mounting bolt holes 25 c of the oil pan 25. An insertion hole 31c is formed. Positioning pins (not shown) corresponding to (matching) the pin holes 21 c of the engine block 21 protrude from the mounting surface 31 a of the end plate 31.

  As shown in FIG. 3, is the mounting surface 31 a of the end plate 31 abutted against the plate upper mounting surface 21 a of the engine block 21 and the plate lower mounting surface 25 b of the oil pan 25, respectively (per two surfaces)? Or at least the plate upper mounting surface 21a. Each positioning pin of the end plate 31 is inserted into each pin hole 21c (see FIG. 4) of the engine block 21. As a result, the end plate 31 is positioned at a predetermined mounting position on the engine block 21.

  The end plate 31 is fastened to the front side including the engine block 21 and the oil pan 25 by plate mounting bolts 40 (see FIG. 2). That is, the plate mounting bolts 40 shown in FIG. 2 are respectively inserted into the plate upper mounting bolt holes 21b and the plate lower mounting bolt holes 25c of the oil pan 25 through the plate mounting bolt insertion holes 31c. It is tightened.

[Assembly Jig Used for Manufacturing Method of Power Unit 10]
The assembly jig 50 used when assembling the oil pan 25 to the engine block 21 shown in FIG. 5 has the plate lower mounting surface 25b of the oil pan 25 flush with the plate upper mounting surface 21a of the engine block 21. It is for arranging on the top.

  As shown in FIG. 5, the assembly jig 50 includes a jig main body 52 that forms the main body, and four jig mounting bolts 60 that can fasten the jig main body 52 to the engine block 21. Yes. The jig mounting bolt 60 is a headed bolt that can be fastened to the plate upper mounting bolt hole 21 b of the engine block 21.

  The jig main body 52 includes a plate member 53, a total of four first reference members 55, and a pair of left and right second reference members 57. The plate member 53 is formed in a substantially V-shaped plate shape. A handle 54 is integrally or detachably provided on one side of the plate member 53, that is, the upper portion of the front side surface.

  The first reference member 55 is disposed at both the left and right end portions of the upper end portion of the plate member 53 and the left and right end portions near the lower end portion thereof. Each first reference member 55 is formed in a hollow cylindrical shape. One end portion (front end portion) of each first reference member 55 is detachably attached to the rear side surface of the plate member 53 by bolt fastening. Further, both the second reference members 57 are formed in a square plate shape. The upper ends of the second reference members 57 are detachably attached to the lower end of the rear side surface of the plate member 53 by fastening two left and right fixing bolts 58.

  The plate member 53 is formed with a total of four bolt insertion holes 50 a that form a series with the hollow portion of each first reference member 55. 6 is a front view showing a mounting state of the assembly jig in the engine, and FIG. 7 is a sectional view taken along the line VII-VII in FIG.

  As shown in FIG. 7, a first reference surface 55 a made of a plane orthogonal to the axis of the bolt insertion hole 50 a is formed on the front end surface (rear end surface) of each first reference member 55. The first reference surface 55 a can come into contact with the plate upper mounting surface 21 a of the engine block 21. A second reference surface 57a that is flush with the first reference surface 55a is formed on the rear side surface of the second reference member 57.

  As shown in FIG. 5, in each first reference member 55, the upper left and right bolt insertion holes 50 a are located on the upper side of the six plate upper mounting bolt holes 21 b of the engine block 21. The two plate upper mounting bolt holes 21b are arranged (corresponding) to the corresponding positions. Further, the two lower left and right bolt insertion holes 50a are respectively arranged at positions corresponding (aligned) with the two left and right plate upper mounting bolt holes 21b. Each bolt insertion hole 50a can be inserted with a jig mounting bolt 60.

[Method for Manufacturing Power Unit 10]
(1) First, the assembly jig 50 (see the two-dot chain line 50 in FIG. 7) is attached to the engine block 21. That is, the plate member 53 is disposed so as to straddle the output shaft 22, and the first reference surface 55 a of each first reference member 55 of the jig body 52 is brought into contact with the plate upper mounting surface 21 a of the engine block 21. At this time, the bolt insertion holes 50a of the first reference members 55 are coaxially aligned with the upper plate mounting bolt holes 21b above the engine block 21 and the lower plate upper mounting bolt holes 21b below the engine block 21. In this state, the jig mounting bolts 60 are respectively tightened into the plate upper mounting bolt holes 21b of the engine block 21 through the bolt insertion holes 50a of the jig main body 52. As a result, the jig body 52 is attached to the engine block 21 (see the solid line 50 in FIGS. 6 and 7).

(2) Next, the oil pan 25 is attached to the engine block 21 (see the solid line 25 in FIG. 7). That is, both plate lower mounting surfaces 25 b of the oil pan 25 are brought into contact with the second reference surfaces 57 a of both the second reference members 57 of the jig body 52. Thereby, the plate upper mounting surface 21a of the engine block 21 and the plate lower mounting surface 25b of the oil pan 25 are flush with each other, or at least the plate lower mounting surface 25b of the oil pan 25 is at the plate upper mounting surface of the engine block 21. It arrange | positions in the state (retracted state) which does not protrude from 21a.

(3) Subsequently, the oil pan mounting bolts 25e (see FIG. 5) are respectively tightened into the oil pan mounting bolt holes 21d of the engine block 21 through the oil pan mounting bolt insertion holes 25d of the oil pan 25. Thereby, the oil pan 25 is attached to the engine block 21 (see FIG. 6).

(4) Next, the jig mounting bolts 60 are removed from the engine block 21 and the assembly jig 50 is removed. As a result, the plate upper mounting surface 21a of the engine block 21 and the plate lower mounting surface 25b of the oil pan 25 are exposed (see FIG. 4).

(5) Next, the mounting surface 31a of the end plate 31 is brought into contact with the plate upper mounting surface 21a of the engine block 21 and the plate lower mounting surface 25b of the oil pan 25 (see FIG. 3), or at least the plate upper mounting surface 21a The surface 31a to be attached of the end plate 31 is brought into contact with the surface. At this time, each positioning pin (not shown) of the end plate 31 is inserted into each pin hole 21c (see FIG. 4) of the engine block 21. Thereby, each plate mounting bolt insertion hole 31c of the end plate 31 is aligned with each plate upper mounting bolt hole 21b of the engine block 21 (see FIG. 2) and each plate lower mounting bolt hole 25c of the oil pan 25. The

(6) Subsequently, the plate mounting bolts 40 (see FIG. 2) are connected to the plate upper mounting bolt holes of the engine block 21 via the six plate mounting bolt insertion holes 31c on the upper portion of the end plate 31. Tighten to 21b. Thereby, the end plate 31 is attached to the engine block 21. Further, the plate mounting bolt 40 is fastened to each plate lower mounting bolt hole 25 c of the oil pan 25 via the two plate mounting bolt insertion holes 31 c below the end plate 31. Thereby, the end plate 31 is attached to the oil pan 25 (see FIG. 3).

(7) Thereafter, the rotor 32 is attached to the output shaft 22 of the engine block 21 and the stator 33 is attached to the end plate 31 (see FIG. 3). At this time, by using the stator / rotor assembly jig 70 (see FIG. 8), the attachment of the rotor 32 to the output shaft 22 with the air gap 32G between the stator 33 and the rotor 32 secured, and Then, the stator 33 is attached to the end plate 31.

[Operation / Effect of Manufacturing Method of Power Unit 10]
According to the manufacturing method of the power unit 10 described above, the reference surface of the assembly jig 50 is detachably attached to the plate upper attachment surface 21a of the engine block 21 in a state of contact with the surface. Then, the oil pan 25 is attached to the engine block 21 in a state where the plate lower mounting surface 25b of the oil pan 25 is in contact with or close to the reference surface of the assembly jig 50. As a result, the plate upper mounting surface 21a of the engine block 21 and the plate lower mounting surface 25b of the oil pan 25 are flush with each other, or at least the plate lower mounting surface 25b of the oil pan 25 is at the plate of the engine block 21. Thus, the oil pan 25 can be attached to the engine block 21 without being protruded beyond the upper attachment surface 21a. Thereafter, the assembly jig 50 is removed from the engine block 21. Next, the end plate 31 of the rotating electrical machine 30 may be attached to the plate upper mounting surface 21a of the engine block 21 in a surface contact state, and the end plate 31 may be mounted to the plate lower mounting surface 25b of the oil pan 25. Therefore, the end plate 31 can be assembled without inclining in a state where at least the plate upper mounting surface 21a of the engine block 21 and the plate lower mounting surface 25b of the oil pan 25 are in contact with the plate upper mounting surface 21a. . Thereby, the assembly | attachment defect of the end plate 31 of the rotary electric machine 30 can be suppressed. As a result, it is possible to suppress a decrease in the air gap 32G between the stator 33 and the rotor 32 due to the inclination of the stator 33 with respect to the rotor 32 due to poor assembly of the end plate 31.

[Operation / Effect of Assembly Jig 50 Used in Manufacturing Method of Power Unit 10]
According to the assembling jig 50 used in the method for manufacturing the power unit 10 described above, the engine block 21 is mounted on the engine block 21 with the first reference surfaces 55a of the jig main body 52 being brought into contact with the plate upper mounting surface 21a of the engine block 21. The jig body 52 is fastened by the jig mounting bolt 60. The oil pan 25 is attached to the engine block 21 in a state where the plate lower mounting surface 25b of the oil pan 25 does not protrude beyond the second reference surface 57a of the jig body 52. As a result, the plate upper mounting surface 21a of the engine block 21 and the plate lower mounting surface 25b of the oil pan 25 are flush with each other, or at least the plate lower mounting surface of the oil pan does not protrude beyond the engine plate upper mounting surface. Can be. Thereafter, the jig body 52 can be removed from the engine block 21 by removing the jig mounting bolts 60 from the engine block 21.

  Further, the plate upper mounting bolt hole 21 b of the engine block 21 can also be used as the bolt hole of the jig mounting bolt 60. For this reason, it is not necessary to form a dedicated bolt hole corresponding to the jig mounting bolt 60 in the engine block 21.

  The first reference member 55 and the second reference members 57 are detachably attached to the plate member 53. For this reason, compared with the assembly jig of an integrally molded product, the processing cost and material cost concerning the assembly jig 50 are low, and the cost can be reduced. Further, when the first reference member 55 and / or both second reference members 57 are worn due to the use of the assembly jig 50, the assembly jig of the integrally molded product is replaced as a whole, whereas each first reference member 55 is replaced. Since the member 55 and / or the second reference member 57 need only be replaced for each part, the maintenance cost can be reduced.

[Other Embodiments] The present invention is not limited to the above-described embodiments, and can be modified without departing from the present invention. For example, the appearance, shape, configuration, structure, and the like of the power unit 10 of the present invention are not limited to the appearance, shape, configuration, structure, etc. described in the present embodiment, and may be various within a range that does not change the gist of the present invention. It can be changed, added and deleted. Moreover, you may use the power unit 10 for apparatuses other than an industrial vehicle.

  The number of the plate upper mounting bolt holes 21b of the engine block 21 and / or the number of the plate lower mounting bolt holes 25c of the oil pan 25 may be increased or decreased. The shape of the plate upper mounting surface 21a of the engine block 21 and / or the plate lower mounting surface 25b of the oil pan 25 may be changed. The plate upper mounting surface 21a of the engine block 21 may be formed of a plurality of plate upper mounting surfaces including at least one plate upper mounting bolt hole 21b. The plate lower mounting surface 25b of the oil pan 25 may be formed of one or more plate upper mounting surfaces including at least one plate lower mounting bolt hole 25c.

  Further, the shape and number of the first reference surface 55a and / or the second reference surface 57a of the assembly jig 50 may be changed. In addition, one reference surface that serves as both the first reference surface 55a and the second reference surface 57a may be formed on the assembly jig 50. Further, the first reference member 55 and / or the second reference member 57 of the assembly jig 50 may be formed integrally with the plate member 53. Alternatively, a dedicated bolt hole corresponding to the jig mounting bolt 60 may be formed in the engine block 21.

DESCRIPTION OF SYMBOLS 10 Power unit 20 Engine 21 Engine block 21a Plate upper attachment surface 21b Plate upper attachment bolt hole 25 Oil pan 25b Plate lower attachment surface 30 Rotating electrical machine 31 End plate 40 Plate attachment bolt 50 Assembly jig 52 Jig body 55a 1st Reference surface 57a Second reference surface 60 Jig mounting bolt

Claims (3)

In a power unit comprising an engine and a rotating electrical machine,
After the oil pan is attached to the engine block of the engine, the end plate of the rotating electrical machine is attached to the plate upper attachment surface formed on the engine block in a state of contact with the plate, and the plate lower attachment surface formed on the oil pan is attached. A power unit manufacturing method for attaching the end plate,
The reference surface of the assembly jig is detachably attached to the upper surface of the plate of the engine block while being in contact with the surface, and the lower surface of the plate of the oil pan extends beyond the reference surface of the reference surface of the assembly jig. A method for manufacturing a power unit, wherein the assembly unit is removed from the engine block after the oil pan is attached to the engine block in the absence of the engine block. An assembly jig used in the method for manufacturing a power unit according to claim 1,
A jig body;
A jig mounting bolt capable of tightening the jig body to the engine block;
With
The jig main body is flush with the plate upper mounting surface of the engine block and is flush with the plate upper mounting surface of the engine block. An assembling jig having a possible second reference surface. The assembly jig according to claim 2,
The engine block has a plate mounting bolt hole in which a plate mounting bolt for mounting the end plate is tightened.
The jig for mounting the jig is provided so as to be fastened to the bolt hole for mounting the plate.

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