JP7346515B2 - ACG cover for internal combustion engine - Google Patents

Description

The present invention primarily relates to improvements in ACG covers for internal combustion engines.

Conventionally, this engine is used in internal combustion engines in which a crankshaft is supported by a crankcase, and an AC generator is provided at one shaft end of the crankshaft that protrudes through the crankcase, and this AC generator and reduction gear mechanism are housed. Additionally, there is an ACG cover to which a pulsar sensor that measures the rotation of the crankshaft is attached (see Patent Document 1).

International Publication WO 2020/054845 Publication

In conventional ACG covers, when installing a pulsar sensor, a mounting hole is provided in the ACG cover to mount the pulsar sensor, the detection section at the tip of the pulsar sensor is inserted into the mounting hole, and then the rear end of the pulsar sensor that protrudes outside the ACG cover is attached. It was fixed to the ACG cover with parts and bolts. However, with this kind of ACG cover, a part of the pulsar sensor protrudes from the ACG cover, and there is a possibility that the pulsar sensor may be damaged by flying stones, etc., and the internal combustion engine as a whole becomes larger due to the mounting materials etc. to attach the pulsar sensor. .
Therefore, it is desirable to protect the pulsar sensor by arranging it inside the ACG cover, and also to eliminate the mounting members and bolts on the outside of the ACG cover to downsize the internal combustion engine.
However, when placing the pulsar sensor inside the ACG cover, it is necessary to provide a boss for attaching the pulsar sensor, but this prevents interference with the boss for supporting the reduction shaft of the reduction gear mechanism placed inside the ACG cover. Therefore, the ACG cover becomes large.

In order to solve the above problems, the present invention provides a crankshaft that is rotatably supported by a crankcase, an AC generator provided at one shaft end of the crankshaft that protrudes through the crankcase, and an AC generator that protrudes through the crankcase. Used in internal combustion engines equipped with a pulsar sensor that detects rotational pulses and a reduction gear mechanism.
In an ACG cover for an internal combustion engine that houses the AC generator,
comprising a side wall facing the AC generator and a peripheral wall provided around the side wall,
a reduction shaft boss protruding from the side wall and supporting the reduction shaft of the reduction gear mechanism;
having one or more sensor mounting bosses protruding from the side wall and for fastening the pulsar sensor;
The bearing portion of the reduction shaft boss is located closer to the crankshaft in the axial direction of the crankshaft than the boss portion of the proximal sensor mounting boss that is located closest to the reduction shaft boss among the sensor mounting bosses. This is an ACG cover for an internal combustion engine, characterized in that the ACG cover is located close to the side wall in terms of direction.

According to the above configuration, even if the reduction shaft boss supporting the reduction shaft of the reduction gear mechanism and the sensor mounting boss for attaching the pulsar sensor are provided in the ACG cover, the bearing part of the reduction shaft boss is not used for sensor mounting. Since the boss surface of the proximal sensor mounting boss closest to the reduction shaft boss is located closer to the side wall in the crankshaft direction, it is easier to install the pulsar sensor even if two types of bosses are placed close to each other. Since the fastening bolt does not interfere with the boss portion into which it is screwed, it is possible to arrange the reduction shaft boss and the sensor mounting boss close to each other, and the ACG cover can be made more compact.

In the configuration, the boss surface of the reduction shaft boss is located further from the side wall in the crankshaft direction than the boss surface of the proximal sensor mounting boss,
The reduction shaft boss has a notch cut out from the boss surface of the reduction shaft boss to the boss surface of the proximal sensor mounting boss on a surface facing the proximal sensor mounting boss. It may be made to have.

According to the above configuration, even if the boss surface of the reduction shaft boss is located further from the side wall in the crankshaft direction than the boss surface of the proximal sensor mounting boss, the reduction shaft boss is located farther from the side wall than the boss surface of the proximal sensor mounting boss. The surface facing the boss has a notch cut out from the boss surface of the reduction shaft boss to the boss surface of the proximal sensor mounting boss, so that the reduction shaft boss and the proximal sensor mounting boss are cut out. The bosses can be placed close together, and the ACG cover can be made more compact.

In the above configuration, the circumferential surface of the reduction shaft boss and the circumferential surface of the proximal sensor attachment boss may be integrated.

According to the above configuration, by integrating the circumferential surface of the reduction shaft boss and the circumferential surface of the proximal sensor mounting boss, the rigidity of the circumferential surface of the reduction shaft boss and the vicinity of the proximal sensor mounting boss is reduced. can be increased.

In the configuration, there are two sensor mounting bosses,
The peripheral surface of the distal sensor mounting boss located far from the reduction shaft boss among the sensor mounting bosses is connected to the peripheral wall along the axial direction of the boss portion of the distal sensor mounting boss. You can also connect them.

According to the above configuration, since the peripheral surface of the distal sensor mounting boss is connected to the peripheral wall along the axial direction of the boss portion of the distal sensor mounting boss, the distal sensor mounting boss The rigidity of the material can be increased.

According to the present invention, even if the reduction shaft boss supporting the reduction shaft of the reduction gear mechanism and the sensor mounting boss for attaching the pulsar sensor are provided in the ACG cover, the reduction shaft boss and the sensor mounting boss are The ACG cover can be placed close to each other, and a compact ACG cover can be provided.

FIG. 1 is a left side view of a motorcycle equipped with a power unit using an ACG cover according to an embodiment of the present invention. FIG. 3 is a left side view of the power unit. FIG. 3 is a sectional view of main parts of the power unit. FIG. 3 is a left side view of the power unit with the side wall of the ACG cover cut away. FIG. 2 is an enlarged left side view of the main parts of the power unit with the ACG cover removed. FIG. 3 is a diagram of the ACG cover seen from the inside. FIG. 3 is an enlarged perspective view of the main parts of the ACG cover. FIG. 3 is a cross-sectional view of the vicinity of the reduction gear mechanism taken along a line connecting the center of the power transmission line cover attachment boss and the center of the reduction shaft. FIG. 3 is an enlarged perspective view of the main parts of the ACG cover. FIG. 3 is a sectional view of the vicinity of the reduction gear mechanism taken along a line connecting the axial center of the reduction shaft and the axial center of the proximal sensor mounting boss portion.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A power unit using an ACG cover for an internal combustion engine according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 10. FIG. 1 is a left side view of a motorcycle 100 as an example of a saddle-ride type vehicle equipped with a power unit 1 using the ACG cover of the present invention. Note that the present invention can also be applied to other saddle type vehicles. In the description of the present invention, the terms "front" and "rear" refer to the front and rear directions of the vehicle in which the present invention is mounted.

As shown in FIG. 1, the power unit 1 includes an SOHC type single-cylinder four-stroke internal combustion engine E and a transmission M integrated, and the crankshaft 10 of the internal combustion engine E is oriented in the width direction of the vehicle body. It is mounted on the motorcycle 100 so that the cylinder axis is slightly tilted forward. A transmission case 3 is integrally formed at the rear of a crankcase 2 that rotatably supports a crankshaft 10 of an internal combustion engine E to constitute a power unit case.

Referring to FIG. 2, a cylinder block 4 and a cylinder head 5 are sequentially stacked and fastened together diagonally above the crankcase 2, and a cylinder head cover 6 is placed over the cylinder head 5. The cylinder head 5 and cylinder head cover 6 protrude from the crankcase 2.

The rotational driving force of the crankshaft 10 of the internal combustion engine E is transmitted to a main shaft (not shown) via an intermittent clutch (not shown), and transmitted to a counter via a transmission M disposed behind the crankshaft 10. The power is transmitted to a shaft (not shown), and the rear wheels are rotationally driven. The transmission M includes a constant-meshing type transmission gear mechanism in which a plurality of driving gears (not shown) provided on a main shaft and a plurality of driven gears (not shown) provided on a counter shaft are always in mesh with each other. .

Referring to FIG. 3, the crankcase 2 is divided into left and right parts, and is constructed by integrating a left crankcase 20 and a right crankcase 30. The left and right crankcases 20, 30 have a left bearing wall 21 and a right bearing wall 31 that rotatably support the crankshaft 10, and the left bearing wall 21 and the right bearing wall 31 constitute a crank chamber 2S. There is.
In the crankshaft 10, crank webs 10w, 10w are located in the crank chamber 2S between the left bearing wall 21 and the right bearing wall 31, and the crank webs 10w, 10w penetrate the left bearing wall 21 and the right bearing wall 31 to the left and right outside, and the left crankshaft portion 10a and the right crankshaft portion 10b protrude. The left outer side of the crankcase 2 is covered with an ACG cover 50, and the right outer side is covered with a right case cover 7.

A drive sprocket 12 for a valve drive system is fitted to the left crankshaft 10a near the main bearing 11, and an AC generator 40 is provided at the left end of the left crankshaft 10a. A driven gear 14 of the starting mechanism is fitted in between.

The AC generator 40 is composed of an outer rotor 41 that is bowl-shaped and has magnets 41m arranged around its inner peripheral surface, and an inner stator 42 that has a power generation coil 42c provided on the outside.
The outer rotor 41 is fitted onto the shaft end 10a1 of the left crankshaft 10a of the crankshaft 10, fixed with a nut ₂₅ , and rotates together with the crankshaft 10.

The inner stator 42 is fixed to the ACG cover 50 with bolts 26, and when the ACG cover 50 is fixed to the left crankcase 20, the inner stator 42 is placed inside the outer rotor 41, and the magnet 41m of the outer rotor 41 and the inner stator 42 generate electricity. The coils 42c are now facing each other. The outer rotor 41 has a large number of detection protrusions 41t formed on its outer peripheral surface at equal intervals in the circumferential direction.

FIG. 4 shows a state in which the left side wall of the ACG cover 50 is cut to reveal the inside of the AC generator, and FIG. 5 is a left side view of the main parts of the power unit 1 with the ACG cover 50 removed. As shown in FIGS. 4 and 5, the left bearing wall 21 of the left crankcase 20 has a circular wall portion 21a facing the AC generator 40, and an extending wall extending diagonally rearward and upward from the circular wall portion 21a. It has a section 21b.

A starter motor 60 is disposed above the crankcase 2 in contact with the right wall surface of the extending wall portion 21b. As shown in FIG. 5, the starter motor 60 has a motor output shaft 61 oriented in the vehicle width direction parallel to the crankshaft 10, and the motor output shaft 61 protruding to the left passes through the extending wall portion 21b. are doing.

Referring also to FIG. 8, the motor output shaft 61 is formed with a pinion gear 61p. A large-diameter gear 64 and a small-diameter gear 65 are integrally provided on a reduction shaft 63 that is pivotally supported approximately at the center of the extending wall portion 21b. A pinion gear 61p meshes with the large diameter gear 64, and a large diameter driven gear 66 provided on the crankshaft 10 via a one-way clutch meshes with the small diameter gear 65, thereby forming a reduction gear mechanism 62. ing. The reduction gear mechanism 62 is arranged along the left side surface of the extending wall portion 21b. At the time of starting, the rotation of the motor output shaft of the starter motor 60 forcibly rotates the crankshaft 10 via the reduction gear mechanism 62 to start the internal combustion engine E.

Referring to FIG. 5, a peripheral wall 22 is formed on the left side bearing wall 21 of the crankcase 2 so as to protrude to the left so as to surround the AC generator 40 and the reduction gear mechanism 62. The left end surface of the peripheral wall 22 is a mating surface 22f with the ACG cover 50, and the peripheral wall 22 is formed with a plurality of fastening bosses 22b having bolt holes.

As shown in FIGS. 6 and 7, the ACG cover 50 attached to the left crankcase 20 from the left includes a side wall 51 that covers the left crankcase 20 from the left, and a peripheral wall 52 around the side wall 51. It is formed to protrude towards the right. The left end surface of the peripheral wall portion 52 is a mating surface 52f with the left crankcase 20, and the peripheral wall portion 52 is formed with a plurality of boss portions 52b through which bolts 70 are inserted. When the mating surface 22f of the peripheral wall 22 of the left crankcase 20 and the mating surface 52f of the ACG cover 50 are aligned, and the bolt 70 is inserted into the boss portion 52b and screwed into the fastening boss portion 22b, as shown in FIG. ACG cover 50 is attached to crankcase 20.

As shown in FIG. 7, the side wall portion 51 of the ACG cover includes an approximately disk-shaped ACG storage portion 51a in which the AC generator 40 is stored, an outer edge portion 51b continuous to the peripheral wall portion 52, and an outer edge between the ACG storage portion 51a and the outer edge. 51b and a stepped portion 51c formed between the portion 51b and the stepped portion 51c. A portion of the outer edge portion 51b extends obliquely upward and rearward from the ACG storage portion 51a, and serves as an extension portion _51b1 that accommodates the pulsar sensor 45 and the reduction gear mechanism 62. The ACG accommodating portion 51a protrudes outward from the outer edge portion 51b so as to accommodate the AC generator 40, and a stepped portion 51c is formed between the ACG accommodating portion 51a and the outer edge portion 51b.

A cylindrical inner stator attachment portion 53 to which the inner stator 42 of the AC generator 40 is attached is formed approximately at the center of the ACG housing portion 51a. The inner stator mounting portion 53 is provided with a plurality of bolt boss portions 53b, and as shown in FIG. 6, the bolts 26 inserted into the bolt insertion holes 42b of the inner stator 42 are screwed into the bolt boss portions 53b. Then, the inner stator 42 is fixed to the ACG cover 50.

As shown in FIG. 6, the three-phase power transmission line 43 extends upward from the power generation coil 42c of the inner stator 42 of the AC generator 40, passes through the extension part _51b1 of the ACG cover 50, and is fitted into the peripheral wall part 52. It passes through the grommet 44 and extends to the outside. The three-phase power transmission line 43 is covered with a power transmission line cover 71, and after the power transmission line cover 71 is fitted into a fitting convex portion 59 formed to protrude from the side wall portion 51, a bolt 72 inserted through the cover is fitted. is screwed into a cover attachment boss portion 58 protruding from the side wall portion 51 and fixed to the ACG cover 50 (see FIG. 8).

As shown in FIGS. 7 to 10, the reduction shaft boss portion ₅₄ into which the reduction shaft 63 of the reduction gear mechanism 62 is inserted protrudes toward the left crankcase 20 side in the extension portion 51b1 of the ACG cover 50. It is set up. The reduction shaft boss portion 54 is formed such that the rotation center of the reduction shaft 63 is parallel to the crankshaft direction. A bearing portion 54d that rotatably supports the reduction shaft 63 is formed in the reduction shaft boss portion 54.

As shown in FIG. 8, a reduction shaft boss portion 24 is also provided on the extending wall portion 21b of the left crankcase 20 in an upright direction toward the ACG cover 50. As shown in FIG. When the ACG cover 50 is attached to the left crankcase 20, the reduction shaft 63 is rotatably supported by the reduction shaft boss portion 24 of the left crankcase 20 and the reduction shaft boss portion 54 of the ACG cover 50. .

As shown in FIGS. 7 and 9, the extension portion 51b ₁ of the ACG cover 50 has two sensor mounting boss portions 55 and 56 protruding toward the left crankcase 20 to which the pulsar sensor 45 is attached. . The pair of sensor mounting bosses 55 and 56 are erected in a substantially cylindrical shape from the extending portion 51b1 of the side wall ₅₁ toward the left crankcase 20 side. The pair of sensor mounting bosses 55 and 56 are formed continuously from the stepped portion 51c of the side wall portion 51, and improve the strength of the ACG cover 50. Further, the sensor mounting bosses 55 and 56 are formed farther from the crankshaft center C1 than the outer periphery of the outer rotor 41 of the AC generator 40, so that they do not interfere with the rotation of the outer rotor 41.

The ACG cover 50 of this embodiment is provided with two sensor mounting bosses: a proximal sensor mounting boss 55 provided closest to the reduction shaft boss 54; The boss part 54 is provided with a distal sensor mounting boss part 56 provided at the farthest position. As shown in FIG. 6, the pulsar sensor 45 is fastened to the ACG cover 50 by screwing bolts 48 into the proximal sensor mounting boss portion 55 and the distal sensor mounting boss portion 56, respectively. The electric wire extending from the pulser sensor 45 passes under the power transmission line cover 71, passes through the grommet 44, and is routed outside the ACG cover 50. In the ACG cover 50 of this embodiment, two sensor mounting bosses are provided, but one or more bosses may be provided, and three or more bosses may be provided.

When the ACG cover 50 is attached to the left crankcase 20, the detection portion 45s of the pulser sensor 45 faces the outer circumferential surface of a large number of detection protrusions 41t (see FIG. 3) formed on the outer circumferential surface of the outer rotor 41 of the AC generator 40. The pulsar sensor 45 detects the rotation angle of the crankshaft 10 by detecting a change in magnetic flux caused by the proximity of the detected protrusion 41t of the rotating outer rotor 41 using the detection unit 45s.

Next, the reduction shaft boss portion 54 and the proximal sensor attachment boss portion 55 will be described in detail. As shown in FIG. 7, the reduction shaft boss portion 54 and the proximal sensor mounting boss portion 55 are provided adjacent to each other, and are close to the circumferential surface 54c of the boss portion 54a of the reduction shaft boss portion 54. The circumferential surface 55c of the boss portion 55a of the side sensor mounting boss portion 55 is formed continuously and integrally with the circumferential surface 55c of the boss portion 55a.
As shown in FIGS. 7 and 10, the boss surface 54b of the boss portion 54a of the reduction shaft boss portion 54 is located in the crankshaft direction from the boss surface 55b of the boss portion 55a of the proximal sensor mounting boss portion 55. , are formed at a position far from the side wall portion 51. That is, the reduction shaft boss portion 54 is formed to have a higher height from the side wall portion 51 than the proximal sensor attachment boss portion 55.

Furthermore, the reduction shaft boss part 54 has a boss face 55b of the proximal sensor mounting boss part 55 from the boss face 54b of the reduction shaft boss part 54 to the surface facing the proximal sensor mounting boss part 55. A notch 54e is formed which is cut out to the end. Since the notch 54e is formed in the reduction shaft boss 54, even if the proximal sensor mounting boss 55 is placed close to the reduction shaft boss 54, the reduction shaft boss 54 can be removed when the pulsar sensor 45 is installed. The part 54 does not get in the way.

Further, as shown in FIGS. 9 and 10, the bearing portion 54d for receiving the reduction shaft 63 of the reduction shaft boss portion 54 is formed at a position away from the boss surface 54b, and is formed at a position away from the boss surface 54b. The boss portion 55a of the portion 55 is formed at a position closer to the side wall 51 in the crankshaft direction L. In other words, the bolt hole 55d of the proximal sensor mounting boss part 55 does not reduce the thickness of the bearing part 54d of the reduction shaft boss part 54, so the proximal sensor mounting boss part 55 does not reduce the thickness of the bearing part 54d of the reduction shaft boss part 54. Even if the portions 55 are arranged close to each other, it is possible to maintain sufficient strength of the bearing portion 54d of the reduction shaft boss portion 54.

Further, of the pair of sensor mounting bosses 55 and 56, the peripheral surface 56c of the distal sensor mounting boss 56 located far from the reduction shaft 63 is the boss of the distal sensor mounting boss 56. It is formed so as to be connected to the peripheral wall portion 52 along the axial direction of 56a. The distal side sensor mounting boss portion 56 is formed to stand up from the extension portion _51b1 of the side wall portion 51 and to be located inside the side wall portion 51 so as to be continuous with the peripheral wall portion 52 below the pulsar sensor 45. There is. Since it is provided continuously inside the side wall portion 51, the strength of both the side wall portion 51 and the extending portion _51b1 is increased.

Since the ACG cover 50 for the internal combustion engine according to the embodiment of the present invention is configured as described above, it has the following effects.

In the ACG cover 50 of this embodiment, the crankshaft 10 is pivotally supported by the crankcases 2, 20, 30, and one shaft end 10a ₁ of the crankshaft 10 protrudes through the crankcases 2, 20, 30. The AC generator 40 is used in an internal combustion engine E, which is equipped with a pulser sensor 45 that detects rotational pulses of the crankshaft 10, and a reduction gear mechanism 62. 40 and a peripheral wall 52 provided around the side wall 51, a reduction shaft boss part protruding from the side wall 51 for supporting a reduction shaft 63 of a reduction gear mechanism 62. 54, and one or more sensor mounting boss parts 55, 56 protruding from the side wall part 51 and for fastening the pulsar sensor 45, and the bearing part 54d of the reduction shaft boss part 54 is a sensor mounting boss part. From the boss portion 55a of the proximal sensor mounting boss portion 55, which is located closest to the reduction shaft boss portion 54 among the reduction shaft boss portions 55 and 56, the side wall portion 51 is Located nearby.

According to the above configuration, even if the reduction shaft boss portion 54 that supports the reduction shaft 63 of the reduction gear mechanism 62 and the sensor mounting boss portions 55 and 56 for attaching the pulsar sensor 45 are provided in the ACG cover 50, the reduction shaft The bearing part 54d of the sensor mounting boss part 54 is attached to the side wall in the crankshaft direction L from the boss face 55b of the proximal sensor mounting boss part 55 which is closest to the reduction shaft boss part 54 among the sensor mounting boss parts 55 and 56. Since it is located close to part 51, even if two types of boss parts are placed close to each other, they will not interfere with the sensor mounting boss part 55, which is screwed into the fastening bolt 48 for mounting the pulsar sensor 45. The portion 54 and the proximal sensor mounting boss portion 55 can be disposed close to each other, and the ACG cover 50 can be made more compact.

Furthermore, the boss surface 54b of the reduction shaft boss portion 54 is located further from the side wall 51 in the crankshaft direction L than the boss surface 55b of the proximal sensor mounting boss portion 55, and the reduction shaft boss portion 54 is The surface facing the proximal sensor mounting boss 55 has a notch 54e cut out from the boss surface 54b of the reduction shaft boss 54 to the boss surface 55b of the proximal sensor mounting boss 55. Therefore, the reduction shaft boss part 54 and the proximal sensor mounting boss part 55 can be arranged close to each other, and the ACG cover 50 can be made more compact.

Furthermore, by integrating the circumferential surface 54c of the reduction shaft boss section 54 and the circumferential surface 55c of the proximal sensor mounting boss section 55, the circumferential surface 54c of the reduction shaft boss section 54 and the proximal side Rigidity near the sensor mounting boss 55 can be increased.

Furthermore, there are two sensor mounting boss parts 55, 56, and the peripheral surface 56c of the distal sensor mounting boss part 56 located far from the reduction shaft boss 54 among the sensor mounting boss parts 55, 56. Since the boss portion 56a of the distal sensor attachment boss 56 is connected to the peripheral wall 52 along the axial direction, the rigidity of the distal sensor attachment boss portion 56 can be increased.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the gist of the invention. , vehicles, internal combustion engines, etc., of course, include those implemented in various ways.
For convenience of explanation, the illustrated embodiment has been described with respect to the left-right arrangement, but even if the left-right arrangement is different, it is included in the present invention as long as it falls within the gist of the invention.

1...Power unit, 2...Crank case,
10...Crankshaft, 10a ₁ ...Shaft end,
20...Left crankcase, 30...Right crankcase
40...AC generator, 45...pulsa sensor, 48...volt,
50...ACG cover, 51...Side wall part, 52...Peripheral wall part, 54...Reduction shaft boss part, 54b...Boss surface, 54c...Surrounding surface, 54d...Bearing part, 54e...Notch part, 55...Proximal side sensor mounting 55a...Boss part, 55b...Boss surface, 55c...Surrounding surface, 56...Boss part for distal side sensor attachment, 56c...Surrounding surface,
62...Reduction gear mechanism, 63...Reduction shaft,
E...Internal combustion engine, C1...Crankshaft center, L...Crankshaft direction.

Claims (4)

A crankshaft (10) is supported by a crankcase (2, 20, 30), and one shaft end (10a ₁ ) of the crankshaft (10) protrudes through the crankcase (2, 20, 30). ) is provided with an AC generator (40), used for an internal combustion engine (E) equipped with a pulsar sensor (45) for detecting rotational pulses of the crankshaft (10), and a reduction gear mechanism (62),
In an ACG cover for an internal combustion engine that houses the AC generator (40),
A side wall (51) facing the AC generator (40), and a peripheral wall (52) provided around the side wall (51),
a reduction shaft boss (54) protruding from the side wall (51) for supporting the reduction shaft (63) of the reduction gear mechanism (62);
having one or more sensor mounting bosses (55, 56) protruding from the side wall (51) and for fastening the pulsar sensor (45) with bolts (48);
The bearing portion (54d) of the reduction shaft boss (54) is connected to the proximal sensor mounting boss (54) located closest to the reduction shaft boss (54) among the sensor mounting bosses (55, 56). 55), the ACG cover for an internal combustion engine is located closer to the side wall (51) in the crankshaft direction (L), which is the axial direction of the crankshaft (10), than the boss part (55a) of the internal combustion engine. The boss surface (54b) of the reduction shaft boss (54) is further away from the side wall (51) in the crankshaft direction (L) than the boss surface (55b) of the proximal sensor mounting boss (55). It is located far away,
The reduction shaft boss (54) has a surface that faces the proximal sensor mounting boss (55) from the boss surface (54b) of the reduction shaft boss (54) to the proximal sensor mounting boss (54). The ACG cover for an internal combustion engine according to claim 1, further comprising a notch (54e) cut out to the boss surface (55b) of the boss (55). The circumferential surface (54c) of the reduction shaft boss (54) and the circumferential surface (55c) of the proximal sensor mounting boss (55) are integral with each other. 2. ACG cover of internal combustion engine according to 2. There are two sensor mounting bosses (55, 56),
Among the sensor mounting bosses (55, 56), the peripheral surface (56c) of the distal sensor mounting boss (56) located far from the reduction shaft boss (54) is used for mounting the distal sensor. The ACG cover for an internal combustion engine according to any one of claims 1 to 3, wherein the ACG cover for an internal combustion engine is connected to the peripheral wall (52) along the axial direction of the boss portion (56a) of the boss (56).

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