JP6812905B2 - Power unit manufacturing method and assembly jig used in the manufacturing method - Google Patents

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 are industrial vehicles such as forklifts in which an oil pump is driven by a power unit including an engine (internal combustion engine) and a rotary electric machine (see, for example, Patent Document 1). In the industrial vehicle, the rotor of the rotary electric machine is connected to the crankshaft (output shaft) of the engine, and the pump shaft of the oil pump is connected to the rotor of the rotary electric machine. The oil pump is driven by an engine or a rotary electric machine to generate flood control for traveling and cargo handling. When the rotary electric machine operates as a generator, the engine becomes the drive source for the rotary electric machine and the oil pump. When the rotary electric machine operates as an electric motor, the rotary electric machine serves as a drive source for the oil pump.

Japanese Unexamined Patent Publication No. 2016-001965

In a power unit including an engine and a rotary electric machine, after attaching an oil pan to the engine block of the engine, the end plate of the rotary electric 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. In some cases, the manufacturing method of is adopted. In this case, as shown in FIG. 9, the end plate 131 is attached to at least the plate upper mounting surface of the plate upper mounting surface 121a formed on the engine block 121 and the plate lower mounting surface 125b formed on the oil pan 125. It is necessary to come into contact with the surface 121a. In FIG. 9, reference numeral 122 indicates an output shaft which is a crankshaft of an engine. The term "engine block" as used herein refers to an integrated engine cylinder block and crankcase.

By the way, in general, the oil pan 125 is attached to the engine block 121 by bolting. Therefore, 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 a dimensional error, an assembly error, or the like. For example, as shown in FIG. 10, when the plate lower mounting surface 125b of the oil pan 125 protrudes from the plate upper mounting surface 121a of the engine block 121, the end plate 131 sticks to the engine block 121 and the oil pan 125. You can't hit the surface and you will lean. If the end plate 131 is bolted to the engine block 121 and the oil pan 125 in this state, a defective assembly of the end plate 131 occurs. Further, considering that the stator 133 of the rotary electric machine is coaxially attached to the end plate 131 in the subsequent process, while the rotor 132 of the rotary electric machine is coaxially attached to the output shaft 122 of the engine, the rotor 132 and the stator A misalignment occurs with 133. Therefore, 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 and the average value of the radial size of the air gap 132G increases.

An object to be solved by the present invention is to provide a method for manufacturing a power unit and an assembling jig used for the manufacturing method, which can suppress a defective assembly of an end plate of a rotary electric machine.

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

According to the first invention, in a power unit including an engine and a rotary electric machine, after attaching an oil pan to the engine block of the engine, the end plate of the rotary electric machine is brought into contact with the plate upper mounting surface formed on the engine block. It is a method of manufacturing a power unit in which the end plate is attached to the plate lower attachment surface formed on the oil pan, and the reference surface of the assembly jig is in contact with the plate upper attachment surface of the engine block. After attaching the oil pan to the engine block in a state where the plate lower mounting surface of the oil pan does not protrude from the reference surface on the reference surface of the assembly jig, the oil pan can be attached from the engine block. This is a method of manufacturing a power unit in which the assembly jig is removed.

According to the first invention, the reference surface of the assembling jig is detachably attached to the plate upper mounting surface of the engine block in a surface contact state. Then, the oil pan is attached to the engine block with the plate lower mounting surface of the oil pan in contact with or close to the reference surface of the assembly jig. As a result, the plate upper mounting surface of the engine block and the plate lower mounting surface of the oil pan are flushed, or at least the plate lower mounting surface of the oil pan protrudes from the plate upper mounting surface of the engine block. The oil pan can be attached to the engine block without it. After that, the assembly jig is removed from the engine block. Next, after mounting the end plate of the rotary electric machine on the plate upper mounting surface of the engine block, the end plate may be mounted on the plate lower mounting surface of the oil pan. Therefore, the end plate can be assembled without being tilted so as to be in contact with at least the plate upper mounting surface of the plate upper mounting surface of the engine block and the plate lower mounting surface of the oil pan. As a result, it is possible to suppress defective assembly of the end plate of the rotary electric machine.

The second invention is an assembly jig used in the method for manufacturing a power unit of the first invention, wherein a jig main body and a jig mounting bolt capable of tightening the jig main body to the engine block are provided. The jig body is provided so as to be flush with the plate upper mounting surface of the engine block and the first reference surface capable of surface contact with the plate upper mounting surface of the engine block and to be flush with the plate upper mounting surface of the oil pan and to be mounted on the lower plate of the oil pan. It is an assembly jig having a surface and a second reference surface that can be contacted with each other.

According to the second invention, the jig body is fastened to the engine block with jig mounting bolts 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 lower mounting surface of the oil pan plate touching the second reference surface of the jig body. As a result, the plate upper mounting surface of the engine block and the plate lower mounting surface of the oil pan can be made flush with each other, or at least the oil pan plate lower mounting surface can be prevented from protruding from the engine plate upper mounting surface. it can. After that, the jig main body can be removed from the engine block by removing the jig mounting bolt from the engine block.

According to a third aspect of the invention, in the second invention, the engine block is formed with a plate mounting bolt hole for tightening a plate mounting bolt for mounting the end plate, and the jig mounting bolt is , An assembly jig provided so as to be able to be tightened in 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. Therefore, 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 the 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 rotary electric machine.

It is a perspective view which shows the power unit which concerns on one Embodiment. It is a perspective view which shows disassembled a power unit. It is sectional drawing which cut the peripheral part of the rotary electric machine in the XZ plane passing through the rotation axis. It is a front view which shows the end plate mounting 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 in an engine. FIG. 6 is a cross-sectional view taken along the line VII-VII of FIG. It is the schematic which shows the assembly process of a stator and a rotor with respect to an end plate. It is the schematic which shows the assembly state of the end plate with respect to the engine block and the oil pan which concerns on the prior art. It is the schematic which shows the assembly failure 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, a power unit for driving an oil pump of an industrial vehicle such as a forklift is illustrated. When the X-axis, Y-axis, and Z-axis are described in the figure, the X-axis, Y-axis, and Z-axis are orthogonal to each other, the Z-axis direction indicates vertically upward, and the X-axis direction and Y-axis. The axial direction indicates a horizontal direction, and the X axis indicates a direction parallel to the output axis of the engine and the rotation axis of the rotor of the rotary electric machine. FIG. 1 is a perspective view showing a power unit, FIG. 2 is a perspective view showing the power unit in an exploded manner, and FIG. 3 is a cross-sectional view of a peripheral portion of a rotary electric machine cut along an XZ plane passing through a rotation axis.

[Overview of power unit]
As shown in FIG. 1, the power unit 10 includes an engine 20 and a rotary electric 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 which is a crankshaft is rotatably supported by 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 to the rotary electric machine 30) is defined as "forward", and the direction opposite to the X-axis direction is defined 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 (front end) of the output shaft 22 projects from the front side of the engine block 21 through a shaft hole 26 formed in the rear wall 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 rotary electric machine 30 is arranged on the front side of the engine 20. The rotary electric 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. A plurality of projecting piece-shaped stator mounting portions 31e (8 are shown in FIG. 2) protruding outward in the radial direction at predetermined intervals in the circumferential direction are formed on the outer peripheral portion of the end plate 31.

The end plate 31 is coaxially attached to the front surface side of the engine 20 by bolting. 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. The mounting structure of the end plate 31 with respect to the engine 20 will be described later.

The rotor 32 integrally has an inner shaft portion 32y and an outer shaft portion 32x having an inner / outer double tubular shape. The inner shaft portion 32y is arranged 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 protruding outward in the radial direction is formed at the rear end portion of the outer shaft portion 32x. A rotor core (not shown) and a permanent magnet 32 m 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 bolting while being fitted to the front end portion of the output shaft 22. As a result, the rotor 32 rotates about the axis integrally with the output shaft 22. A ring 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 44a projecting forward is formed at the outer peripheral end of the foreign matter blocking plate 44.

As shown in FIG. 2, the stator 33 has a hollow cylindrical cylindrical portion 33x, a rear flange portion 33c protruding 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. It has a front flange portion 33d that protrudes outward in the direction. A plurality of projecting piece-shaped plate mounting portions 33e corresponding to the stator mounting portions 31e of the end plate 31 are formed on the outer peripheral portion of the rear flange portion 33c. A plurality of projecting piece-shaped cover mounting portions 33f (8 are shown in FIG. 2) protruding outward in the radial direction at predetermined intervals in the circumferential direction are formed on the outer peripheral portion of the front flange portion 33d. As shown in FIG. 3, a plurality of stator cores 33v are provided on the inner peripheral surface of the cylindrical portion 33x at predetermined intervals in the circumferential direction. A stator coil 33a is wound around the stator core 33v.

Each cover mounting portion 33f is attached to each stator mounting portion 31e of the end plate 31 by bolting (see FIG. 1). As a result, as shown in FIG. 3, the stator 33 is coaxially attached to the end plate 31. The inner peripheral surface of the stator core 33v is arranged so as to face the outer peripheral surface of the permanent magnet 32m of the rotor 32 via a so-called air gap 32G at a minute interval.

As shown in FIG. 2, the end cover 34 is formed in a substantially annular plate shape. 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 on the outer peripheral portion of the end cover 34. 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 mounting portion 34e of the end cover 34 is attached to each cover mounting portion 33f of the stator 33 by bolting (see FIG. 1). As a result, as shown in FIG. 3, the end cover 34 is coaxially attached to the front side of the stator 33. The rotor 32 is housed in the internal space formed by the end plate 31, the stator 33, and the end cover 34. Further, the labyrinth portion 34r is fitted to the peripheral cylinder portion 44a of the foreign matter blocking plate 44 with a predetermined gap. A labyrinth path for suppressing the intrusion of foreign matter such as dust into the rotary electric machine 30 is formed by the peripheral cylinder portion 44a of the foreign matter blocking plate 44 and the labyrinth portion 34r of the end cover 34.

An oil pump (only the pump cover 47 is shown in FIG. 3) is coaxially provided 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 bolting. 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 32x of the rotor 32 via a foreign matter blocking plate 44.

A rotation sensor 36 called a resolver for detecting the rotation angle (rotation position) of the rotor 32 is provided between the end plate 31 of the rotary electric machine 30 and the inner shaft portion 32y of the rotor 32. The rotation sensor 36 includes a stator-side rotation detecting means 37 coaxially mounted on the front surface side of the end plate 31, and a rotor-side rotation detecting means 38 coaxially mounted on the outer peripheral portion 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 surface side of the end plate 31, a position adjusting means 39 capable of adjusting the position of the stator side rotation detecting means 37 around the axis is provided (see FIG. 2).

When the engine 20 is driven in the power unit 10 described above, the rotational power of the output shaft 22 is transmitted to the rotor 32. Further, when the rotary electric 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 rotary electric machine 30 to generate flood pressure for traveling and cargo handling. When the rotary electric machine 30 operates as a generator, the engine 20 serves as a drive source for the rotary electric machine 30 and the oil pump. When the rotary electric machine 30 operates as an electric motor, the rotary electric machine 30 serves as a drive source for the oil pump.

[Mounting structure of oil pan 25 to engine block 21]
FIG. 4 is a front view showing the end plate mounting side of the engine, and FIG. 5 is a perspective view showing the relationship between the engine block, the oil pan, and the assembling jig. As shown in FIG. 5, a large number of oil pan mounting bolt holes 21d are formed on the outer peripheral portion of the lower surface of the engine block 21. The bolt holes 21d for mounting the oil pans 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 projects outward at the upper end peripheral portion. The mounting flange portion 25a is formed with an oil pan mounting bolt insertion hole 25d corresponding to (matching) 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 bolts 25e are tightened to the oil pan mounting bolt holes 21d via the oil pan mounting bolt insertion holes 25d.

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

Left and right plate lower mounting surfaces 25b are formed on the front surface side of the oil pan 25. The lower mounting surfaces 25b of both plates are arranged at both left and right ends on the upper end side of the oil pan 25. The lower mounting surfaces 25b of both plates 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 bolt hole 25c for mounting the lower part of the plate is formed on the lower mounting surface 25b of both plates. The bolt holes 25c for mounting the lower part of both plates are arranged so as to form an annular arrangement together with the bolt holes 21b for mounting the upper part of each plate in a state where the oil pan 25 is mounted on 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 a plate mounting bolt corresponding to (matching) the upper mounting bolt hole 21b of each plate of the engine block 21 and the lower mounting bolt hole 25c of each plate of the oil pan 25. An insertion hole 31c is formed. A positioning pin (not shown) corresponding to (matching) each pin hole 21c of the engine block 21 is projected from the mounted surface 31a of the end plate 31.

As shown in FIG. 3, is the mounted surface 31a of the end plate 31 in 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 (per two surfaces)? Or, at least, it is in contact with the plate upper mounting surface 21a. Further, 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 on the engine block 21 at a predetermined mounting position.

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

[Assembly jig used in the manufacturing method of the power unit 10]
The assembling 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 intended to be placed on top.

As shown in FIG. 5, the assembling jig 50 includes a jig main body 52 as a main body thereof and four jig mounting bolts 60 capable of tightening the jig main body 52 to the engine block 21. There is. The jig mounting bolt 60 is composed of a headed bolt that can be tightened in the plate upper mounting bolt hole 21b of the engine block 21.

The jig main body 52 has a plate member 53, a total of four first reference members 55 in all directions, 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, on the upper part of the front side surface.

The first reference member 55 is arranged at the left and right end portions of the upper end portion of the plate member 53 and at 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 (front end) of each first reference member 55 is detachably attached to the rear side surface of the plate member 53 by bolting. Further, both second reference members 57 are formed in a quadrangular plate shape. The upper ends of both second reference members 57 are detachably attached to the lower ends 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 50a in the vertical and horizontal directions forming a series with the hollow portion of each first reference member 55. FIG. 6 is a front view showing the mounting state of the assembling jig in the engine, and FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG.

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

As shown in FIG. 5, the upper left and right two bolt insertion holes 50a of each of the first reference members 55 are located above the six plate upper mounting bolt holes 21b of the engine block 21. They are arranged at positions corresponding to (matching) with the two plate upper mounting bolt holes 21b. Further, the lower left and right two bolt insertion holes 50a are arranged at positions corresponding to (matching) with the lower left and right two plate upper mounting bolt holes 21b, which are also located below. Each bolt insertion hole 50a can be inserted with a jig mounting bolt 60.

[Manufacturing method of power unit 10]
(1) First, the assembly jig 50 (see the alternate long and short dash line 50 in FIG. 7) is attached to the engine block 21. That is, the plate member 53 is arranged so as to straddle the output shaft 22, and the first reference surface 55a of each first reference member 55 of the jig body 52 is brought into contact with the plate upper mounting surface 21a of the engine block 21. At this time, the bolt insertion holes 50a of each of the first reference members 55 are coaxially aligned with the bolt holes 21b for mounting on both plates above the engine block 21 and the bolt holes 21b for mounting on both plates below. In this state, the jig mounting bolts 60 are tightened to the plate upper mounting bolt holes 21b of the engine block 21 via the bolt insertion holes 50a of the jig body 52, respectively. 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, the lower mounting surfaces 25b of both plates of the oil pan 25 are brought into contact with the second reference surfaces 57a of both second reference members 57 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 flushed, or at least the plate lower mounting surface 25b of the oil pan 25 is the plate upper mounting surface of the engine block 21. It is arranged in a state where it does not protrude from 21a (retracted state).

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

(4) Next, each jig mounting bolt 60 is 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 mounted 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. The surface to be attached 31a of the end plate 31 is brought into contact with the surface 21a . 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. As a result, the plate mounting bolt insertion holes 31c of the end plate 31 are aligned with the plate upper mounting bolt holes 21b of the engine block 21 (see FIG. 2) and the plate lower mounting bolt holes 25c of the oil pan 25. To.

(6) Subsequently, the plate mounting bolts 40 (see FIG. 2) are inserted into the plate mounting bolt holes 31c of the engine block 21 via the six plate mounting bolt insertion holes 31c on the upper part of the end plate 31. Tighten to 21b respectively. As a result, the end plate 31 is attached to the engine block 21. Further, the plate mounting bolts 40 are tightened to the plate lower mounting bolt holes 25c of the oil pan 25 via the two plate mounting bolt insertion holes 31c at the lower part of the end plate 31. As a result, the end plate 31 is attached to the oil pan 25 (see FIG. 3).

(7) After that, 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 rotor 32 can be attached to the output shaft 22 and the rotor 32 can be attached to the output shaft 22 while the air gap 32G between the stator 33 and the rotor 32 is secured. , The stator 33 is attached to the end plate 31.

[Action / 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 assembling jig 50 is detachably attached to the plate upper mounting surface 21a of the engine block 21 in a surface contact state. Then, the oil pan 25 is attached to the engine block 21 with the plate lower mounting surface 25b of the oil pan 25 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 flushed, or at least the plate lower mounting surface 25b of the oil pan 25 is the plate of the engine block 21. It is inevitable that the oil pan 25 does not protrude from the upper mounting surface 21a, and the oil pan 25 can be mounted on the engine block 21. After that, the assembly jig 50 is removed from the engine block 21. Next, the end plate 31 of the rotary electric 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 attached to the plate lower mounting surface 25b of the oil pan 25. Therefore, the end plate 31 can be assembled without tilting at least in a state of being in contact with the plate upper mounting surface 21a of the plate upper mounting surface 21a of the engine block 21 and the plate lower mounting surface 25b of the oil pan 25. .. As a result, it is possible to suppress a defective assembly of the end plate 31 of the rotary electric machine 30. 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 improper assembly of the end plate 31.

[Action / effect of the assembly jig 50 used in the manufacturing method of the power unit 10]
According to the assembly jig 50 used in the method for manufacturing the power unit 10 described above, the engine block 21 is contacted with the first reference surface 55a of the jig body 52 against the plate upper mounting surface 21a of the engine block 21. The jig body 52 is fastened with 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 from 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 made uniform, or at least the plate lower mounting surface of the oil pan does not protrude from the engine plate upper mounting surface. Can be. After that, the jig main body 52 can be removed from the engine block 21 by removing the jig mounting bolt 60 from the engine block 21.

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

Further, each of the first reference member 55 and both second reference members 57 are detachably attached to the plate member 53. Therefore, the processing cost and the material cost required for the assembling jig 50 are lower than those of the assembling jig of the integrally molded product, 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 assembling jig 50, the assembling jig of the integrally molded product is totally replaced, whereas each first reference is used. Since it is sufficient to replace each part of the member 55 and / or both second reference members 57, the maintenance cost can be reduced.

[Other Embodiments] The present invention is not limited to the above-described embodiment, and changes can be made without departing from the present invention. For example, the appearance, shape, configuration, structure, etc. 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 various as long as the gist of the present invention is not changed. It can be changed, added, and deleted. Further, the power unit 10 may be used for equipment other than industrial vehicles.

Further, 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. Further, 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. Further, the plate upper mounting surface 21a of the engine block 21 may be formed by a plurality of plate upper mounting surfaces including at least one plate upper mounting bolt hole 21b. Further, the plate lower mounting surface 25b of the oil pan 25 may be formed by one or three 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. Further, the assembling jig 50 may be formed with one reference plane that also serves as the first reference plane 55a and the second reference plane 57a. Further, the first reference member 55 and / or the second reference member 57 of the assembly jig 50 may be integrally formed with the plate member 53. Further, a dedicated bolt hole corresponding to the jig mounting bolt 60 may be formed in the engine block 21.

10 Power unit 20 Engine 21 Engine block 21a Plate upper mounting surface 21b Plate upper mounting bolt hole 25 Oil pan 25b Plate lower mounting surface 30 Rotating electric machine 31 End plate 40 Plate mounting 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 equipped with an engine and a rotary electric machine
After mounting the oil pan by using a jig assembled to the engine block of the engine, the end plate of the rotary electric machine to the plate upper mounting surface formed on the engine block in a state of being contact surface, it said plate upper mounting for the face and the plate bottom mounting surface formed on the oil pan attached by plate mounting bolts the end plate, a manufacturing method of the power unit,
The assembling jig includes a jig main body and jig mounting bolts that can be tightened to the plate upper mounting surface from the same direction as the end plate mounting direction.
The jig main body includes a plate member, a first reference member provided on the plate member and having a first reference surface that can come into contact with the plate upper mounting surface, and a plate upper mounting provided on the plate member. It has a second reference member that is flush with the surface and has a second reference surface that is flush with the plate lower mounting surface.
The plate member and the first reference member are formed with bolt insertion holes that penetrate in a series and allow the jig mounting bolts to be inserted.
When assembling the oil pan to the engine block, the jig mounting bolt is mounted on the plate upper part through the bolt insertion hole in a state where the first reference surface is brought into contact with the plate upper mounting surface. by tightening the face, the attachment detachably said jig body to the engine block, then in a state in which the said plate was lower mounting surface per side or close to the second reference plane, the oil to the engine block A method for manufacturing a power unit, in which the jig mounting bolt is removed after the pan is attached, and the jig body is removed from the engine block. An assembly jig used in the method for manufacturing a power unit according to claim 1.
It is provided with a jig body and a jig mounting bolt that can be tightened on the plate upper mounting surface from the same direction as the end plate mounting direction .
The jig main body includes a plate member, a first reference member provided on the plate member and having a first reference surface that can come into contact with the plate upper mounting surface, and a plate upper mounting provided on the plate member. a second reference member having a surface and forms a flush and the plate bottom mounting surface and a second reference surface which can contact the surface, it has a,
An assembly jig in which the plate member and the first reference member are formed with bolt insertion holes that penetrate in a series and allow the jig mounting bolts to be inserted . The assembly jig according to claim 2.
A plate upper mounting bolt hole for tightening the plate mounting bolt is formed on the plate upper mounting surface of the engine block.
The jig mounting bolts can be tightened to the plate upper mounting bolt hole, assembling jig.

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