JP5331491B2 - Engine cover structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the stiffness to fasten a sprocket cover at two upper and lower positions. <P>SOLUTION: A clamp 31 is integrally protruded backward from a rear wall 30 of an ACG cover 6 arranged in a left case cover 5 to support a sensor harness 15. The sprocket cover 7 is put over the sensor harness 15 to cover an output sprocket 11, and fastened to a crankcase 1 with bolts 13, 14 at two upper and lower positions. Then, the stiffness of a front end 7b is enhanced with the tip of the clamp 31 abutted on and supported to the inner face of the front end 7b to allow fastening only by two upper and lower positions. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention relates to an engine cover structure, and more particularly to an engine cover structure that can be mounted with high support rigidity at a small number of mounting points with respect to a protective cover that covers the outside of an output sprocket.

  An output shaft that outputs engine power is provided on the side of the engine case mounted on the saddle-ride type vehicle, an output sprocket is provided on the output shaft extension, and the sprocket cover that covers this output sprocket is bolted. The structure fastened to the engine case is known.

JP 2007-290640 A

By the way, when fastening the sprocket cover, the unfixed end, for example, the front end, becomes unstable during the work of bolting the outside, and the fastening work is performed in this unstable state. I had to. In order to improve workability, the number of fastening points is as small as possible. For example, it is desirable to have only two places. However, since the sprocket cover is disposed on the outermost side of the engine case and below the engine, high rigidity is required. It is difficult to increase the rigidity of the sprocket cover when the number of fastening portions is reduced to two or the like.
Therefore, the present application aims at an engine cover structure in which a protective cover such as a sprocket cover is provided with a small number of fastening points and high rigidity can be obtained.

In order to solve the above problems, an engine cover structure according to the present invention is attached to an engine case, an output shaft supported by the engine case, and an extension portion of the output shaft protruding from the engine case so as to be integrally rotatable. An output sprocket, a protective cover that is attached to the outer surface of the engine case and covers the outside of the output sprocket, and a detector that has a harness that is supported by the engine case and extends to the outside of the engine to detect the state of the engine In the engine cover structure in which the outside of the engine case is covered with a case cover having a bulging portion that bulges outward,
Protrudes outward with a predetermined distance from the bulging portion of the case cover, the harness a cover side rib for guiding between said bulging portion, abutting the inner side of the protective cover at the cover side rib While supporting
The protective cover is provided with an end portion located between the bulging portion and the contact portion of the cover side rib,
Further, an overlap portion is formed between the abutting portion of the cover side rib and the end portion, and a pressing rib formed integrally and projecting from the overlapping portion toward the base portion of the cover side rib is provided. The harness is prevented from coming off .

In addition, in the configuration including the same premise portion as described above, a case cover extension portion extending from the case cover in the axial direction of the output shaft is provided, and the protective cover is spaced from the bulging portion of the engine case by a predetermined distance. A cover rib projecting inward at a position spaced apart,
The cover rib is abutted and supported by the case cover extension, and the harness is guided between the bulge and the cover rib.
Further, the protective cover includes an end portion located between the cover rib and the bulging portion ,
An overlap part is formed between the cover rib and the end part, and the overlap part covers an accommodation space of the harness formed between the bulge part and the cover rib .

When attaching the protective cover to the outer surface of the engine case, the depth of the protective cover is regulated by positioning the protective cover against the cover-side rib provided on the case cover, so that the assembly position is improved. Good.
Even when the number of fastening points is reduced, the inside of the protective cover is supported by the cover-side ribs, and the stress intensity inward from the outside is increased. Furthermore, the harness can be protected with a simple configuration by covering the outside of the harness with a protective cover while guiding the harness with the engine case. Furthermore, it is possible to prevent the harness from coming off by a pressing rib that is projected and formed at the end of the protective cover.

In addition, instead of the cover-side rib, a case cover extension that extends from the case cover in the axial direction of the output shaft is provided, and the protective cover is spaced from the bulge of the engine case by a predetermined distance with respect to the case cover extension. A cover rib projecting inward at a position spaced apart,
The cover rib is abutted and supported by the case cover extension, and the harness is guided between the bulge and the cover rib.
Further, the protective cover has an end portion located between the cover rib and the bulging portion, and abuts and supports a cover rib protruding inward provided on the protective cover, and a harness is provided between the bulging portion and the cover rib. The same effect can be obtained even if the harness is prevented from coming off at the overlap between the end of the protective cover and the cover rib .

Left side view of an air-cooled engine for motorcycles Partial sectional view of the engine along line 2-2 in FIG. Enlarged sectional view of the back wall and clamp part Sectional view taken along line 4-4 in FIG. Left side view of left case cover and sprocket cover Left side view of an air-cooled engine for a motorcycle according to a second embodiment. Left side view of the left crankcase Left side view of the left case cover Rear view of left case cover Sprocket cover side view 11-11 sectional view of FIG. 12-12 sectional view of FIG. Sectional drawing which expanded the site | part similar to FIG. 3 concerning 3rd Example The principal part enlarged view of 4th Example which further modified 3rd Example

  An embodiment will be described below with reference to the drawings. 1 to 5 relate to a first embodiment, and FIG. 1 is a left side view of an air-cooled engine for a motorcycle. The engine includes a crankcase 1 and a cylinder block 2 provided on a front portion thereof and inclined slightly forward from the vertical direction, a cylinder head 3 stacked thereon, and a cylinder head cover 4 covering the cylinder head 3.

  A left case cover 5 for covering the left side surface is attached to the side surface of the crankcase 1, and a part of the left case cover 5 forms an ACG cover 6 that bulges outward in a substantially bowl shape. A sprocket cover 7 formed separately from the left case cover 5 is attached to the rear of the left case cover 5, and a front end 7 b of the front portion 7 a is arranged along the rear edge of the left case cover 5. . The left case cover 5 is made of a highly rigid metal and is formed by casting a light alloy or the like. The sprocket cover 7 is appropriately formed from a material, but is made of resin in this embodiment.

  The rear end portion 7f of the sprocket cover 7 is provided with a substantially semicircular concave portion 7g that enters forward in the middle in the vertical direction, and a pivot 8 that supports the front end portion of the rear fork (not shown) in a swingable manner. Is facing. The pivot shaft of the pivot 8 is supported by a pivot frame 9 disposed in the vertical direction behind the engine.

  The sprocket cover 7 covers the outer side of the output sprocket 11 provided on the output shaft 10 of the engine and a part of the chain 12 wound around the output sprocket 11 at the center, and the upper part 7d and the lower part 7e are bolts 13 · 14 is fastened to the crankcase 1 at two upper and lower positions.

  The front portion 7 a of the sprocket cover 7 covers a part of the sensor harness 15 wired in the vertical direction between the ACG cover 6 and the output sprocket 11 and the position sensor 16 to which the lower end portion of the sensor harness 15 is connected. The sensor harness 15 extends outward from the upper end of the sprocket cover 7 and extends upward, and is connected to an ECU (not shown) disposed above the crankcase 1.

  The position sensor 16 is a sensor for detecting the shift position by detecting the rotation of the shift drum, which will be described later. The position sensor 16 is located behind the ACG cover 6 and protrudes below the front portion 7a of the sprocket cover 7. Covered by the formed protrusion 7c. Reference numeral 17 denotes a spindle shaft for rotating the shift drum, which is provided at the bottom of the crankcase 1 below the output sprocket 11 and is rotated by operating a shift pedal (not shown).

  Here, the left case cover 5 is the case cover of the present invention, the ACG cover 6 is the bulging portion of the present invention, the sprocket cover 7 is the protective cover of the present invention, the sensor harness 15 is the harness of the present invention, and the position sensor 16 is the present invention. This is a specific example corresponding to each of the detectors.

  2 is a partial cross-sectional view of the engine taken along line 2-2 in FIG. The crankcase 1 is divided into left and right parts in the vehicle width direction, and includes a left crankcase 20 and a right case 21. The outer side of the left crankcase 20 is covered with the left case cover 5 and the sprocket cover 7 on the outer side, and the outer side of the right crankcase 21 is covered with the right case cover 22. Inside the crankcase 1, a crankshaft 23, a main shaft 24, and a countershaft 25 are rotatable to the crankcase 1 with their axes parallel to each other. The counter shaft 25 and the output shaft 10 are coaxial, and the output shaft 10 is integrally formed at the shaft end of the counter shaft 25.

The crankshaft 23 is rotationally driven by a connecting rod 27 integral with a piston 26 that slides in the cylinder 2 a of the cylinder block 2.
One end of the crankshaft 23 (left end portion in this embodiment) protrudes outward from the crankcase 5, and an ACG 28 is supported here. The ACG 28 is a known generator, and bulges outward from the left crankcase 20, and the ACG cover 6 covering the bulge also bulges outward.

  The main shaft 24 and the counter shaft 25 constitute a transmission, and a gear train (not shown) is provided on the main shaft 24 and the output shaft 10, and the driving force transmitted from the crankshaft 23 to the main shaft 24 is a gear. Shifting is performed in a row, and a shift output is transmitted from the counter shaft 25 to the output shaft 10. One end of the output shaft 10 protrudes outward from the left crankcase 20 and supports the output sprocket 11 so as to be integrally rotatable there.

  FIG. 3 is an enlarged view of the peripheral portion of the output sprocket 11. A clamp 31 is integrally provided on the back wall 30, which is a portion of the ACG cover 6 that faces the front end 7 b of the sprocket cover 7. The clamp 31 has a substantially L-shaped cross section including a base portion 32 bent rearward from the rear wall 30 at a substantially right angle and a support protrusion 33 bent at a substantially right angle from the rear end portion to the outer side to form a standing wall shape. The rear case 30 protrudes rearward and is integrally formed when the left case cover 5 is formed by casting or the like. However, it can also be formed separately and integrated by welding or the like.

The support protrusion 33 protrudes outward in parallel with the back wall 30 so as to form a predetermined gap corresponding to the protrusion amount of the base 32 between the support protrusion 33 and the back wall 30. The back wall 30, the base 32, and the support protrusion 33 form a clamp groove 34 having a substantially U-shaped cross section, and the open portion of the clamp groove 34 is directed outward.
The support protrusion 33 of the clamp 31 is a specific example corresponding to the cover side rib of the present invention.

The sensor harness 15 is accommodated in the clamp groove 34, and an overlap portion 41 is formed at the front end portion 7 b of the sprocket cover 7, and a presser formed integrally protruding from the overlap portion 41 toward the base portion 32 of the clamp 31. The rib 40 enters and is positioned on the outer side of the sensor harness 15 and prevents the sensor harness 15 from coming out of the clamp groove 34.

  The base 32 of the clamp 31 is provided at a position that is approximately half the height of the back wall 30 (the amount that bulges outward from the outer surface of the left crankcase 20), and outward from the outer surface of the left crankcase 20. It is provided at a remote location. Further, the corner portion is rounded at the time of molding so that the entire clamp 31 has no edge portion. Therefore, the base 32 restricts the position where the sensor harness 15 enters the innermost portion, and even if the base 32 contacts and supports the sensor harness 15, there is no edge portion, and the outer portion of the left crankcase 20 is not damaged. The sensor harness 15 is not brought into contact with the outer side surface of the left crankcase 20 by being separated from the side surface, thereby preventing damage due to contact with the outer side surface of the left crankcase 20.

  The tip of the support protrusion 33 is in contact with the position immediately after the pressing rib 40 on the inner surface of the front end of the sprocket cover 7. For this reason, the front end portion 7b of the sprocket cover 7 is supported by the clamp 31 from the inside, and the rigidity when the sprocket cover 7 is attached can be increased. Maintains rigidity during proper installation. In particular, even when the sprocket cover 7 is made of resin as in this embodiment, the thickness of the front portion 7a including the front end portion 7b can be reduced to about 2.5 mm.

  The holding rib 40 may be continuously formed over a wide range along the front end portion 7b, or may be formed partially corresponding to the clamp 31 portion. In the case where the pressing rib 40 is partially provided, it is particularly effective to prevent the overlap portion 41 from coming out.

  In the sprocket cover 7, a partition wall 42 projects integrally inward from the inner surface of the front portion 7 a behind the clamp 31. The partition wall 42 extends inward longer than the clamp 31, and the tip reaches the outer surface of the left crankcase 20. The partition wall 42 is a standing wall-like rib that covers the output sprocket 11 so as to surround the first half side in the radial direction. A cylindrical portion 43 projects integrally from the inner surface of the central portion of the sprocket cover 7 to the vicinity of the outer surface of the output sprocket 11.

  On the outer surface of the left crankcase 20, ribs 51 and 52 are formed in the vicinity of the bearing portion 50 that supports the shaft end of the main shaft 24 so as to protrude back and forth. The inner end of the back wall 30 in the cover 6 abuts. A chain guide 53 is supported at the tip of the rear rib 52, and the tip of the partition wall 42 is in contact with the outer surface of the chain guide 53.

The chain guide 53 is a member for guiding the smooth rotation of the chain 12 in front of the chain 12 and on the center in the width direction. It surrounds.
By the rib 52, the chain guide 53, and the partition wall 42, the front of the output sprocket 11 and the chain 12 is partitioned from the ACG cover 6 side. The output sprocket 11 is disposed in the partitioned space and is attached to the tip of the output shaft 10 protruding from the outer surface of the left crankcase 20 so as to be integrally rotatable. The output shaft 10 is supported by a bearing 54 provided in the left crankcase 20.

  4 is a cross-sectional view taken along line 4-4 of FIG. The tip of the support protrusion 33 of the clamp 31 is in contact with the inner surface of the front end 7 b of the sprocket cover 7. Of these contact portions, flat seat portions 44 are formed at the upper and lower contact portions, and the support projections 33 are in contact with the seat portions 44. The abutting portion of the central support protrusion 33 is not particularly formed with a seat portion because the inner surface portion of the front end portion 7b is already substantially flat. Thus, the support portion 33 is more reliably supported by the support protrusion 33 by making the contact portion flat.

  The sprocket cover 7 is fixed with bolts 13 such that the bosses 45 provided on the upper portion 7d overlap the corresponding bosses 55 provided on the outer surface of the left crankcase 20. At this time, the chain guide 53 is also sandwiched between the bosses 45 and 55 and fastened together. The boss 46 provided in advance in the lower portion 7e is overlapped with the corresponding boss 56 of the left crankcase 20 and fixed with the bolt 14. At this time, the lower part of the partition wall 42 goes down to the lower side of the output sprocket 11 and contacts the side surface of the chain guide 53 that also goes down to the lower side of the output sprocket 11. Between the output sprocket 11 and the chain 12 and effectively preventing mud and the like from adhering to the position sensor 16.

A sensor mounting hole 57 is provided in the lower part of the side surface of the left crankcase 20 below the output sprocket 11 and the partition wall 42, and the position sensor 16 is fitted therein and attached with a bolt 58. The sensor mounting hole 57 is fitted with the shaft end of the shift drum 29, the projection 29 a provided at the shaft end of the shift drum 29 and the position sensor 16 are connected, and the rotation of the shift drum 29 is detected by the position sensor 16. It can be done.

  FIG. 5 is an enlarged left side view of the left case cover 5 and the sprocket cover 7. The front end portion 7 b of the sprocket cover 7 has a substantially semicircular arc-shaped portion whose edge facing the ACG cover 6 extends along the rear portion of the ACG cover 6, and overlaps the rear end portion of the left case cover 5. The clamps 31 overlap each other in the upper part, the central part, and the lower part of the front end part 7b.

  A total of three clamps 31 are provided at a rear end portion of the left case cover 5 with a predetermined interval in the vertical direction. The sensor harness 15 is guided by these clamps 31 and wired up and down substantially along the back surface of the back wall 30. Reference numeral 35 denotes a boss provided at the rear end portion for fastening the left case cover 5 to the left crankcase 20 and overlapping the sprocket cover 7. Reference numeral 36 denotes another mounting boss provided around the left case cover 5.

  The bulging portion of the ACG cover 6, the clamp 31, the boss 35, and the like are arranged so as not to overlap each other on the line L connecting the centers of the upper and lower bolts 13 and 14. The positions of the upper and lower bolts 13 and 14 are substantially point symmetric with respect to the center O of the output sprocket 11. By doing so, the sprocket cover 7 can be easily and quickly attached even if the number of fastening portions is reduced.

  Further, when the sprocket cover 7 is attached to the outer side of the left crankcase 20, the front end portion 7 b of the sprocket cover 7 is brought into contact with the inner surface of the front portion 7 a of the sprocket cover 7 by bringing the tip of the support protrusion 33 of the clamp 31 into contact with the inner surface of the front portion 7 a. Since the depth is restricted and positioned, the assemblability is improved. For this reason, assembly workability | operativity can be improved.

  Furthermore, even when the number of fastening points is reduced to two, the inside of the sprocket cover 7 is supported by the support protrusion 33 of the clamp 31, and the stress strength inward from the outside is increased to sufficiently increase the support rigidity. it can. Furthermore, the sensor harness 15 can be protected with a simple structure by covering the outside of the sensor harness 15 with the sprocket cover 7 while guiding the sensor harness 15 with the left case cover 5.

Next, a second embodiment will be described. 6 to 12 relate to the second embodiment, FIG. 6 is a left side view of the engine, FIG. 7 is a left side view of the left crankcase, FIG. 8 is a left side view of the left case cover, and FIG. FIG. 10 is a side view of the sprocket cover, FIG. 11 is a sectional view taken along line 11-11 in FIG. 6, and FIG. 12 is a sectional view taken along line 12-12 in FIG.
Since this example also relates to the wiring of the sensor harness by the left case cover and the sprocket cover of the air-cooled engine as in the previous example, the common parts will be denoted by the same reference numerals, and the same parts as in the previous example will be used. Unless otherwise required, common reference numerals are assigned and description thereof is omitted.

  In FIG. 6, the left case cover 5 is integrally provided with a bulged ACG cover 6 and is bolted to the outer side of the left crankcase 20 with bosses 35 and 36. A sprocket cover 7 is attached to the left crankcase 20 with bolts 13 and 14 at two positions above and below the left case cover 5. The outer side of the output sprocket 11 is covered. The front end portion of the sprocket cover 7 is overlapped with the rear end portion of the left case cover 5, and the sensor harness 15 is wired in the vertical direction on the overlapped portion. These configurations are the same as in the previous embodiment.

As shown in FIG. 7, the left crankcase 20 includes an ACG housing portion 60 on the front side and an output sprocket housing portion 61 on the rear side, and a substantially semicircular arc-shaped chain between the ACG housing portion 60 and the output sprocket housing portion 61. The guide 53 is opened rearward and attached so as to cover the front of the output sprocket housing 61.
A sensor mounting hole 57 is provided in the lower part of the left crankcase 20 between the ACG housing 60 and the chain guide 53, and a spindle hole 62 for passing the spindle shaft is provided adjacent to the rear thereof.

  Reference numeral 63 denotes an attachment portion for the chain guide 53, which is provided at two places on the upper and lower sides, and the upper one of them fastens the boss 45 of the sprocket cover 7 together with the bolt 13 as in the previous embodiment. Reference numeral 64 denotes a boss on the left crankcase 20 side that fastens the boss 46 of the sprocket cover 7 with a bolt 14. 65 is a boss that overlaps the sprocket cover 7 among the mounting bosses of the left case cover 5, and 66 is another mounting boss.

As shown in FIGS. 8 and 9, a clamp 31 is integrally provided on the back wall 30 of the left case cover 5. The clamp 31 includes a flange 70 that connects the upper and lower bosses 35 and extends from the rear wall 30 to the rear output shaft 10 side, and clamp ribs 72 and 73 provided on the upper and lower portions thereof. A rear edge portion of the flange 70 is a substantially arc-shaped portion 71 along the chain guide 53.
The clamp ribs 72 and 73 protrude integrally upward from the upper and lower portions of the flange 70. The clamp rib 72 has an upper end surface shown in FIG. 8 arranged substantially vertically, and the clamp rib 73 is inclined forward so that the upper end surface is positioned upward.

The clamp ribs 72 and 73 are adjacent to the upper and lower bosses 35, respectively. These upper and lower bosses 35 are attached to the upper and lower bosses 65 (FIG. 7) formed on the left crankcase 20, respectively.
Reference numeral 36 denotes a boss that is attached so as to overlap with a plurality of other bosses 66 in the left crankcase 20 and is provided around the left case cover 5.

  As shown in FIG. 9, the clamp ribs 72 and 73 are provided at a position higher than the boss 35 (a position closer to the outside), guides the sensor harness 15 between the back wall 30 and the sensor harness 15 approaches the boss 35. It is supposed not to. In addition, since the flange 70 that is long in the vertical direction is provided as an equivalent to the base portion 32 of the previous embodiment, the left crankcase 20 side of the sensor harness 15 can be supported long by the flange 70. It can be made more difficult to contact the crankcase 20.

  As shown in FIG. 10, the sprocket cover 7 is integrally provided with a cylindrical portion 43 extending to the outer surface of the output sprocket 11 at the center, and the partition wall 42 is integrated so as to surround the front of the cylindrical portion 43 in a substantially semicircular arc shape. Is provided. The partition wall 42 overlaps the chain guide 53 and forms a wall portion that covers the front of the output sprocket 11.

  The front part 42a of the partition wall 42 continues to the rear part on the boss 35 side at the step part 42b, and is pulled rearward from a virtual position where the rear part is extended forward, and the front part 42a and a flange 70 ( A certain gap is provided between the head and FIG. Both ends of the partition wall 42 are connected to the upper and lower bosses 45 and 46. By doing so, even if the partition wall 42 is formed long along the circumferential direction of the output sprocket 11, both ends thereof are integrated with the bosses 45 and 46 having high rigidity, so that sufficient rigidity can be obtained. it can.

  On the inner surface side of the front end portion 7b that is in front of the partition wall 42, pressing ribs 40a and 40b are integrally formed so as to protrude inwardly. The presser ribs 40a and 40b correspond to the clamp ribs 72 and 73 of the left case cover 5, and the upper presser rib 40a is arranged substantially in the same size and substantially parallel to the front of the clamp rib 72 at a predetermined interval. 40b is also arranged approximately in the same size and substantially parallel to the front of the clamp rib 73 with a predetermined interval.

As shown in FIG. 11, when the sprocket cover 7 is attached, the overlap portion 41 of the front end portion 7b overlaps the flange 70, and the clamp ribs 72, 73 (only the clamp rib 72 on one side is visible in the figure) The front ends of the first and second ribs abut against and support the inner surfaces of the front end portions on the rear side of the pressing ribs 40a and 40b (only one pressing rib 40a is visible in the figure) . The holding ribs 40a and 40b enter the clamping groove 34 formed between the clamping ribs 72 and 73 and the back wall 30 and press the upper side of the sensor harness 15 accommodated in the clamping groove 34 in advance.

  Further, the front end portion 7b is inclined forward upward, but the holding ribs 40a and 40b and the partition wall 42 are provided in the front and rear, and the space between them is supported by the clamp ribs 72 and 73, so that the front end portion 7b The rigidity becomes high, and even if the front end portion 7b has such a shape, the opening is enlarged and the deformation does not occur and the front end portion 7b is stable.

  As shown in FIG. 12, the portion of the front end portion 7 b where the holding ribs 40 a and 40 b are not provided forms an overlap portion 41 and covers the upper portion of the flange 70. Since the sensor harness 15 is guided on the flange 70, the upper portion of the sensor harness 15 can be pressed by the overlap portion 41 to prevent the sensor harness 15 from coming off. In addition, the clamp rib 72 (73) does not exist behind the flange 70, but instead, the partition wall 42 is positioned slightly rearward from the rear end of the flange 70. The harness 15 can be guided from the rear side of the vehicle body.

  Thus, according to the present embodiment, the number of holding ribs 40a, 40b and clamp ribs 72, 73 can be reduced, and the clamp structure can be simplified. In addition, since the sensor harness 15 can be guided for a long time by the flange 70, the guide becomes easy, and the risk of damaging the sensor harness 15 by the left crankcase 20 is reduced. In addition to this, the same effects as in the previous embodiment can be obtained. Also, the arrangement of the chain guide 53 shown in FIG. 7, the back structure of the ACG cover 6 in the left case cover 5 of FIG. 8, and the structure of the partition 42 shown in FIG. 10 can be used in the first embodiment. .

  Next, a third embodiment will be described with reference to FIG. FIG. 13 is an enlarged cross-sectional view similar to FIG. In this example, a rear extending portion 90 is formed in a substantially tongue-like shape in a direction orthogonal to the axis of the rear output shaft 10 from the rear wall 30 and faces a flat surface outward. The distal end of the rearward extending portion 90 extends to the vicinity of the outer peripheral position of the output sprocket 11, and here, the distal end of the integral tension rib 47 that extends inward from the inner surface of the front portion 7a substantially at right angles is in contact therewith. Since the front end 7a is supported inward by the back wall 30 by supporting the front end of the rib 47 in contact with the rear extension 90 in this manner, the front end 7b is also attached to the front end 7b. The support rigidity of the front part 7a including can be improved.

The rear extension 90 corresponds to the base 32 and the flange 70 of each of the previous embodiments. However, the rear extension 90 is integrally provided and protrudes long, and the support protrusion 33 that directly contacts the inner surface of the front portion 7a, the clamp ribs 72 and 73 The difference is that it does not have. However, a projection having a short rib shape or the like may be provided from the rear extending portion 90 and the projection and the tip of the tension rib 47 may be brought into contact with each other.
Here, the rear extension 90 corresponds to the case cover extension of the present invention, and the tension rib 47 is a specific example corresponding to the cover rib of the present invention.

In this way, the housing wall 91 of the sensor harness 15 is formed by the back wall 30, the rearward extending portion 90, and the extending rib 47, extending forward beyond the extending rib 47 of the front portion 7 a, and the rear extending portion 90. The accommodating space 91 is covered by the overlapping portion 41 that overlaps upward.
Therefore, the front portion 7a can be supported by the left case cover 5 by the abutment between the projecting rib 47 and the rear extension 90, so that the rigidity can be increased, and the rear extension 90 has a simple shape and a relatively small size. Therefore, when the left case cover 5 is integrally formed, the left case cover 5 can be easily formed.

FIG. 14 shows a fourth embodiment which is a further modification of FIG. 13, in which a small rib 92 is provided from the rear extension 90 to the overlap 41, and from the overlap 41 toward the rear extension 90. And put out a small rib 48.
Each of the ribs 92 and 48 is shifted to the front and back so as not to reach the other side and contact in the vertical direction so as to be spaced apart from each other, and holds the sensor harness 15 at the respective tips.
If it does in this way, the space expansion part of the accommodation space 91 can be freely adjusted by changing the magnitude | size and position of the two ribs 92 and 48. FIG. Therefore, even if the sensor harness 15 becomes thick or flat, it can be reliably pressed.

The present invention is not limited to the above-described embodiments, and various modifications and applications can be made within the principle of the invention. For example, a detector for detecting the state of the engine can be used in place of the position sensor 16. Also, the harness can be variously changed according to the detector as well as the sensor harness for the position sensor 16.
Further, the bulging portion of the engine case is not limited to the ACG cover, but may be any portion that can bulge and guide the harness.
Further, the protective cover is not necessarily the sprocket cover 7 as long as it covers the side of the output sprocket 11, and may be a member called a left rear cover, for example.

1: crankcase, 5: left case cover, 6: ACG cover, 7: sprocket cover, 10: output shaft, 11: output sprocket, 15: sensor harness, 16: position sensor, 20: left crankcase, 30: back Wall, 31: Rib, 35: Clamp, 36: Bottom part, 37: Standing wall part, 38: Clamp groove, 47: Strut rib, 72/73: Clamp rib, 90: Rear extension part

Claims (5)

An engine case 1, an output shaft (10) supported by the engine case, an output sprocket (11) attached to an extension of the output shaft that protrudes from the engine case, and an output sprocket (11) attached to the outer surface of the engine case A protective cover (7) that covers the outside of the output sprocket and a detector (16) having a harness (15) supported by the engine case and extending to the outside of the engine for detecting the state of the engine. In the cover structure of the engine in which the outside of the engine case is covered with a case cover (5) provided with a bulging portion (6) that bulges outward.
A cover-side rib (33) is provided for guiding the harness (15) between the bulge portion (6) while protruding outward from the bulge portion (6) of the case cover with a predetermined interval. the inner side of the protective cover with contacts supported by the cover side rib,
The protective cover is provided with an end portion positioned to (7b) between the bulging portion and the contact portion of the cover side rib (33) (6), further, the abutting portions of the cover side rib (33) And an end portion (7b) are used as an overlap portion (41), and a pressing rib (projected integrally) from the overlap portion (41) toward the base portion (32) of the cover side rib (33) ( 40), and the harness (15) is prevented from coming off by the pressing rib (40) . An engine case, an output shaft supported by the engine case, an output sprocket attached to an extension of the output shaft that protrudes from the engine case, and an outer side of the output sprocket attached to the outer surface of the engine case And a detector with a harness that is supported by the engine case and extends to the outside of the engine to detect the state of the engine, and bulges outward from the engine case. In the engine cover structure covered with a case cover with a bulge,
A case cover extension (90) extending from the case cover in the direction of the output shaft;
The protective cover (7) includes a cover rib (47) projecting inward to be disposed at a predetermined distance from the bulging portion (6) of the engine case,
The cover rib (47) is abutted and supported by the case cover extension (90) , and the harness (15) is guided between the bulging portion (6) and the cover rib (47) ,
Further, the protective cover (7) includes an end (7b) positioned between the cover rib (47) and the bulging portion (6) ,
An overlap portion (41) is formed between the cover rib (47) and the end portion (7b), and is formed between the bulging portion (6) and the cover rib (47) by the overlap portion (41). A cover structure for the engine, which covers the accommodation space (91) of the harness (15) . The protective cover is fastened to the engine case by a plurality of fastening portions (13, 14) , and these fastening portions are arranged substantially symmetrical with respect to the center (O) of the output shaft,
The ribs (33, 47) provided on the case cover side or the protective cover side and the bulging portion are located on a position deviating from a straight line L connecting the fastening portions (13, 14) arranged substantially symmetrical with respect to the point. The engine cover structure according to claim 2, wherein the engine cover structure is arranged. An ACG (28) supported on the crankshaft (23) outside the crankcase is provided, and the bulging portion of the case cover is an ACG cover (6) covering the ACG (28). The engine cover structure according to any one of claims 1 to 3. The detector is a position detection sensor (16) that is disposed below the output shaft (10) and detects the rotational position of the shift drum, and the protective cover (7) covers the outside of the position detection sensor. The engine cover structure according to any one of claims 1 to 4.

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