JP7191911B2 - vehicle - Google Patents

Description

The present invention relates to vehicles.

BACKGROUND ART Conventionally, a vehicle is known in which a hanger portion provided on a vehicle body frame and a power unit are fastened by fasteners inserted through the hanger portion and the power unit (see, for example, Patent Document 1).

WO2010/038586

By the way, in the above-described conventional vehicle, the rigidity of the body frame may decrease as the weight of the body frame is reduced. In this case, the vehicle body frame tends to bend due to the load on the vehicle, and the load generated between the fastener and the power unit may increase.
SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above, and it is an object of the present invention to further reduce the concentration of loads generated between a fastener for a power unit and the power unit.

A vehicle includes a body frame, a power unit supported by the body frame, a hanger section provided on the body frame and fastened to the power unit, and a hanger section and the power unit inserted through the hanger section and the power unit. The power unit includes a fixing hole through which the fastener is inserted, and the fixing hole abuts against the hanger portion in the axial direction of the fastener. A concave portion that is recessed radially inward of the fastener is provided in a portion of the outer circumference of the fastener where the inner circumference of the contact portion overlaps with the circumference , and the hanger portion has the fastener inserted therein. and the inner diameter of the fixing hole is larger than the inner diameter of the hole .

Further, in the above configuration, the hanger portion may include an end portion that abuts on the abutment portion in the axial direction of the fastener, and an inner circumference of the end portion may overlap the recess from the periphery.
Moreover, the above-mentioned structure WHEREIN: The said fastener may be equipped with the fitting part with a larger diameter than the outer diameter of the said recessed part in the said hole.

A chamfered portion may be provided on the inner periphery of the contact portion of the fixing hole.

Further, in the above configuration, the fixing hole is sandwiched between the pair of hangers by the fastening force of the fastener, and the abutting portions are provided at both ends of the fixing hole in the axial direction. , the recesses may be provided at positions overlapping the contact portions at both ends.
Further, in the above configuration, the fastener includes a bolt, and the bolt includes a shaft portion inserted through the hanger portion and the fixing hole portion, and a bolt abutting the hanger portion in the axial direction of the fastener. a head, wherein the recess may be located on the shank at a location spaced axially of the fastener from the bolt head.

Further, in the above-described configuration, the fastener includes a nut that is screwed onto the shaft portion of the bolt, the nut abuts the hanger portion in the axial direction of the fastener, and the concave portion is the shaft portion. may be positioned axially of the fastener from the nut at a portion thereof.
Further, in the above configuration, the hanger portion is interposed between the hanger extension portion extending from the vehicle body frame, the contact portion, and the hanger extension portion, and the fastener is inserted therethrough. A tubular member may be provided.

A vehicle includes a vehicle body frame, a power unit supported by the vehicle body frame, a hanger section provided on the vehicle body frame and fastened to the power unit, and a fastener inserted through the hanger section and the power unit to fasten the hanger section and the power unit. The power unit includes a fixing hole through which the fastener is inserted, the fixing hole includes an abutting portion that abuts the hanger portion in the axial direction of the fastener, and an inner portion of the abutting portion on the outer circumference of the fastener. A recess that is recessed radially inward of the fastener is provided in a portion where the circumference overlaps with the circumference.
According to this configuration, the portion of the outer circumference of the fastener where the abutting portion overlaps with the periphery is provided with a concave portion that is recessed radially inward of the fastener. A large clearance can be secured between the outer periphery of the power unit and the fixing hole of the power unit. Therefore, the bending of the vehicle body frame can be allowed, and the concentration of load generated between the fastener and the fixing hole of the power unit can be reduced.

Further, in the above-described configuration, the hanger portion may include an end portion that abuts the abutment portion in the axial direction of the fastener, and the inner periphery of the end portion may overlap the recess from the periphery.
According to this configuration, a large clearance can be secured between the inner periphery of the end of the hanger portion and the outer periphery of the fastener by the recess, so that the load generated between the fastener and the inner periphery of the end of the hanger portion concentrates. can be reduced. In addition, since the recess is elongated in the axial direction of the fastener, it is easy to secure a clearance between the outer periphery of the fastener and the fixing hole of the power unit.
Further, in the above configuration, the hanger portion may include a hole through which the fastener is inserted, and the fastener may include a fitting portion having a larger diameter than the outer diameter of the recess in the hole.
According to this configuration, even with the configuration in which the concave portion is provided, the fitting portion fits into the hole, thereby reducing rattling between the hole and the outer circumference of the fastener. Moreover, the strength and rigidity of the fastener can be ensured by the fitting portion having a larger diameter than the outer diameter of the recess.

Furthermore, in the above configuration, the inner diameter of the fixing hole may be larger than the inner diameter of the hole.
With this configuration, it is possible to secure a larger clearance between the outer circumference of the fastener and the inner circumference of the contact portion of the fixing hole, and reduce the concentration of the load generated between the fastener and the fixing hole of the power unit. .
A chamfered portion may be provided on the inner periphery of the contact portion of the fixing hole.
Therefore, the chamfered portion can ensure a large clearance between the outer circumference of the fastener and the inner circumference of the contact portion of the fixing hole.

Further, in the above configuration, the fixing hole is sandwiched between the pair of hangers by the fastening force of the fastener, the abutting portions are provided at both ends of the fixing hole in the axial direction, and the recess is provided at both ends of the fixing hole. may be provided at positions overlapping the abutting portions of the .
According to this configuration, a large clearance can be ensured between the inner periphery of the abutment portions at both ends in the axial direction of the fixing hole and the outer periphery of the fastener.
Further, in the above-described configuration, the fastener includes a bolt, and the bolt includes a shaft portion inserted through the hanger portion and the fixing hole portion, and a bolt head that abuts the hanger portion in the axial direction of the fastener, The recess may be located axially of the fastener from the bolt head on the shank.
According to this configuration, since the recess is spaced apart from the bolt head in the axial direction of the fastener, the strength and rigidity of the connecting portion between the bolt head and the shaft can be ensured.

Further, in the above configuration, the fastener includes a nut that is screwed onto the shank of the bolt, the nut abuts the hanger portion in the axial direction of the fastener, and the recess extends from the nut to the fastener shaft in the shank. They may be arranged at positions spaced apart in the direction.
According to this configuration, since the recess is spaced apart from the nut in the axial direction of the fastener, the strength and rigidity of the connecting portion between the nut and the shaft can be ensured.
Further, in the above configuration, the hanger portion includes a hanger extension portion extending from the vehicle body frame, and a tubular member interposed between the abutment portion and the hanger extension portion and through which the fastener is inserted. may be provided.
According to this configuration, since the cylindrical member is provided between the contact portion and the hanger extension portion, it is possible to separate the concave portion from the extension portion in the axial direction of the fastener. This allows the recess to be spaced from the end of the fastener.

1 is a right side view of a motorcycle according to an embodiment of the present invention; FIG. 4 is a right side view of the vehicle body frame; FIG. Fig. 2 is a perspective view of the front portion of the vehicle body frame as viewed from the front side; 4 is a perspective view of a lower frame; FIG. FIG. 11 is a perspective view of the lower cross member, rear hanger portion and link connection; FIG. 4 is a perspective view of a connecting portion between a lower cross member and a center frame as viewed from below; FIG. 4 is a perspective view of the center frame and upper cross member; FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 7; It is the figure which looked at the upper cross member from the upper side. It is a left view which shows the peripheral structure of a swing arm. 2 is a cross-sectional view taken along line XI-XI of FIG. 1; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description, directions such as front, rear, left, right, and up and down are the same as the directions with respect to the vehicle body unless otherwise specified. In each figure, FR indicates the front of the vehicle body, UP indicates the upper side of the vehicle body, and LH indicates the left side of the vehicle body.

FIG. 1 is a right side view of a motorcycle 1 according to an embodiment of the invention.
The motorcycle 1 has an engine 11 as a power unit supported by a body frame 10 , a front fork 12 supporting a front wheel 2 steerably supported by a front end portion of the body frame 10 steerably, and a swinging body supporting a rear wheel 3 . The vehicle has an arm 13 provided at the rear portion of the vehicle body frame 10 .
The motorcycle 1 is a saddle type vehicle in which a rider straddles a seat 14 , and the seat 14 is provided above the rear portion of the vehicle body frame 10 .

2 is a right side view of the body frame 10. FIG.
1 and 2, the body frame 10 includes a head pipe 15 provided at the front end of the body frame 10, a pair of left and right main frames 16 extending rearward and downward from the head pipe 15, and rear ends of the main frames 16. A pair of left and right center frames 17 extending downward from the part are provided.
The vehicle body frame 10 includes a single down frame 18 extending rearwardly and downwardly from the lower portion of the main frame 16 at the head pipe 15 and left and right center frames 17 extending downwardly and rearwardly from the lower end of the down frame 18 . and a lower frame 19 connected to the lower end.
Further, the body frame 10 includes a pair of left and right seat frames 20 extending rearward from the rear portions of the left and right main frames 16 , and a pair of left and right center frames 17 extending rearward and upward from the lower portions of the left and right center frames 17 and connected to the rear portions of the seat frames 20 . and a subframe 21 of

The vehicle body frame 10 includes an upper cross member 22 that connects upper portions of the left and right center frames 17 in the vehicle width direction (lateral direction), a lower cross member 23 that connects the lower portions of the left and right center frames 17 in the vehicle width direction. and a sub-cross member 24 connecting the rear portion of the main frame 16 in the vehicle width direction.
A front end portion of the seat frame 20 is connected to the main frame 16 via a sub-cross member 24 .

The front fork 12 is rotatably supported by the body frame 10 via a steering shaft (not shown) inserted through the head pipe 15 . A steering handle 27 is provided at the upper end of the front fork 12 . The front wheel 2 is pivotally supported on an axle 2 a provided at the lower end of the front fork 12 .

The swing arm 13 is supported by pivot shafts 26 provided on the left and right center frames 17 . The pivot shaft 26 extends horizontally in the vehicle width direction and connects the left and right center frames 17 .
The pivot shaft 26 is inserted through the front end of the swing arm 13 . The swing arm 13 swings up and down around the pivot shaft 26 .
The rear wheel 3 is supported by an axle 3 a provided at the rear end of the swing arm 13 .
The motorcycle 1 includes a rear cushion 28 that spans between the front portion of the swing arm 13 and the body frame 10 . A lower end portion of the rear cushion 28 is connected to the front portion of the swing arm 13 and the rear portion of the lower cross member 23 via a link mechanism 29 .

The engine 11 is arranged in a space surrounded by a main frame 16 , a center frame 17 , a lower frame 19 and a down frame 18 as viewed from the side of the vehicle, and fixed to the vehicle body frame 10 .
Engine 11 is an internal combustion engine. The engine 11 includes a crankcase 31 that supports a crankshaft (not shown) extending in the vehicle width direction, and a cylinder portion 32 that extends upward from the upper front portion of the crankcase 31 . A piston (not shown) that rotates the crankshaft reciprocates vertically within the cylinder portion 32 .

An exhaust pipe 33 of the engine 11 extends rearward from an exhaust port on the front surface of the cylinder portion 32 . A muffler 34 is connected to the downstream end of the exhaust pipe 33 .
A rear portion of the crankcase 31 is a transmission case portion 31a that accommodates a transmission (not shown). The output of the engine 11 is transmitted to the rear wheels 3 by a drive chain 35c connecting a drive sprocket 35a provided on the output shaft of the transmission and a driven sprocket 35b provided on the rear wheels 3. As shown in FIG.

The fuel tank 37 is arranged above the main frame 16 and between the head pipe 15 and the seat 14 .
The motorcycle 1 includes a front cover 38 that covers the head pipe 15 from the front, a front side cover 39 that covers the front upper portion of the body frame 10 and the fuel tank 37 from the sides, and a body below the seat 14 from the sides. A rear side cover 40 for covering, a rear cover 41 for covering the vehicle body behind the seat 14 from above, and an under cover 42 for covering the lower part of the engine 11 from front and below are provided.
The motorcycle 1 also includes a chain cover 43 that covers the drive chain 35c.

A front fender 44 is attached to the front fork 12 .
A pair of left and right steps 45 on which the feet of an occupant seated on the seat 14 are placed are attached to the lower ends of the left and right center frames 17 .

FIG. 3 is a perspective view of the front portion of the body frame 10 as seen from the front side. 4 is a perspective view of the lower frame 19. FIG.
2 to 4, the lower frame 19 includes a pair of left and right extending portions 19a extending rearwardly and downwardly from the down frame 18, and left and right extending portions 19a connecting the upper ends of the left and right extending portions 19a in the vehicle width direction. and a connecting portion 19b.
Specifically, the lower frame 19 is formed by bending a piece of pipe material into a U-shape at an intermediate portion in the longitudinal direction of the pipe material. That is, in the lower frame 19, the left and right connecting portions 19b and the extending portions 19a are integrally formed by one piece of pipe material.

The left and right connecting portions 19 b form upper ends of the lower frames 19 . The left-right connecting portion 19b constitutes the bottom portion of the U-shape and is bent in an arc shape.
The lower end of the down frame 18 is provided with a connecting portion 18a formed in a U shape along the outer periphery of the left and right connecting portions 19b. The lower frame 19 is welded to the connecting portion 18a by fitting the left and right connecting portions 19b to the connecting portion 18a from below.

The extending portion 19a includes a downward extending portion 19a1 extending rearward and downward from the lower end of the left and right connecting portion 19b, and a rearward extending portion 19a2 extending rearward from the lower end of the downward extending portion 19a1.
The downward extending portion 19a1 extends vertically along the front surface of the engine 11 . The rearwardly extending portion 19a2 extends in the front-rear direction along the lower surface of the engine 11. As shown in FIG. A rear end of the rear extension portion 19 a 2 is connected to the lower end of the center frame 17 .
The lower frame 19 is provided with a pair of left and right hanger portions 50L and 50R for supporting the engine 11. As shown in FIG.

2 and 3, the lower cross member 23 is a pipe member that connects the lower ends of the left and right center frames 17 in the vehicle width direction.
A rear hanger portion 51 that supports the rear portion of the engine 11 is provided on the front surface of the lower cross member 23 .
A link connection portion 52 to which the link mechanism 29 (FIG. 1) is connected is provided on the rear surface of the lower cross member 23 . The rear hanger portion 51 is composed of a pair of left and right plate members extending rearward from the rear surface of the lower cross member 23 .

5 is a perspective view of the lower cross member 23, the rear hanger portion 51, and the link connection portion 52. FIG.
The lower cross member 23 is a pipe material with a circular cross section.
The rear hanger portion 51 includes a pair of left and right support plate portions 53 arranged with the plate thickness direction oriented in the vehicle width direction, and a rib 54 extending inward in the vehicle width direction from the lower edge of each support plate portion 53 . Prepare.
A support hole 53 a is provided in the front end portion of the support plate portion 53 . The engine 11 has a rear fixing portion (not shown) arranged between the left and right support plate portions 53 at the rear end portion of the crankcase 31 .
The engine 11 is fastened to the rear hanger portion 51 by fixing bolts (not shown) inserted through the left and right support holes 53a and the rear fixing portion.

An upper edge 53b of the support plate portion 53 is inclined rearwardly upward. A rear edge 53c of the support plate portion 53 is formed in an arc shape along the outer periphery of the front surface of the lower cross member 23. As shown in FIG. The support plate portion 53 is welded to the outer periphery of the front surface of the lower cross member 23 at the rear edge 53c.
Specifically, the lower end portion of the rear edge 53 c of the support plate portion 53 is welded to the lower end portion of the front surface of the lower cross member 23 . The upper end portion 53c1 of the rear edge 53c of the support plate portion 53 is welded to the upper end portion of the front surface of the lower cross member 23. As shown in FIG. The upper end portion 53c1 is positioned above the center of the lower cross member 23 as viewed in the axial direction. By extending the upper end portion 53c1 of the rear edge 53c of the support plate portion 53 to the upper end portion of the front surface of the lower cross member 23 in this manner, the weld length can be increased, and the rear hanger portion 51 can be firmly attached to the lower cross member 23. can be combined.

FIG. 6 is a perspective view of the connecting portion between the lower cross member 23 and the center frame 17 as viewed from below.
The lower cross member 23 has an end portion 23a in the vehicle width direction coupled to the inner surface of the center frame 17 in the vehicle width direction. Specifically, the lower cross member 23 is welded to the inner surface of the center frame 17 in the vehicle width direction by a weld bead 55 along the outer periphery of the end portion 23a.

The lower frame 19 has an inwardly extending portion 56 extending inward in the vehicle width direction from the rear portion of the extending portion 19 a in front of the lower cross member 23 .
A stay 57 that connects the lower surface of the lower cross member 23 and the lower surface of the inwardly extending portion 56 is provided on the lower surface of the vehicle body frame 10 . The stay 57 is a plate member arranged with its plate thickness direction oriented in the vertical direction.

A pair of left and right stays 57 are provided inside the left and right extending portions 19 a in the vehicle width direction and outside the rear hanger portion 51 in the vehicle width direction.
The stay 57 supports the undercover 42 (FIG. 1). A rear portion of the undercover 42 is fastened to a fixing hole 57 a of the stay 57 .
A notch portion 57 b that avoids the weld bead 55 is provided at the outer end portion in the vehicle width direction of the rear end portion of the stay 57 . Thereby, the stay 57 can be easily installed at the welding position, and the stay 57 can be easily welded to the lower cross member 23 and the center frame 17 .

7 is a perspective view of the center frame 17 and upper cross member 22. FIG. FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG.
Connecting members 60 to which the upper cross members 22 are connected are provided on the inner side surfaces of the left and right center frames 17 in the vehicle width direction.
The upper cross member 22 is a pipe material having a circular cross section.
The connection member 60 includes a tubular portion 60a to which the outer peripheral portion of the end portion 22a of the upper cross member 22 in the vehicle width direction is fitted, and a flange portion 60b extending radially outward from the outer periphery of the tubular portion 60a. .

The connection member 60 has a flange portion 60b welded to the inner surface of the center frame 17 in the vehicle width direction.
The upper cross member 22 is in a state in which the outer peripheral portion of the end portion 22a is fitted to the inner peripheral portion of the tubular portion 60a, and is welded to the tubular portion 60a by a weld bead (not shown) along the end surface of the tubular portion 60a in the vehicle width direction. It is welded to the shaped portion 60a. A gap is formed in the vehicle width direction between the end portion 22a of the upper cross member 22 and the inner surface of the center frame 17 in the vehicle width direction.

FIG. 9 is a top view of the upper cross member 22. FIG.
7 and 9, the upper cross member 22 is provided with a cushion bracket 62 that supports the upper end portion 28a of the rear cushion 28. As shown in FIG.
The cushion bracket 62 is arranged in the center in the vehicle width direction and extends rearward from the upper cross member 22 .

The cushion bracket 62 includes a pair of left and right cushion support plate portions 63 arranged with the plate thickness direction oriented in the vehicle width direction, and an upper plate portion 64 connecting the upper edge portions of the cushion support plate portions 63 in the vehicle width direction. Prepare.
A rear portion of the cushion support plate portion 63 is provided with a cushion fixing hole 63a through which a cushion fixing bolt 65 is inserted.
The upper end portion 28 a of the rear cushion 28 is arranged between the left and right cushion support plate portions 63 . The upper end portion 28a of the rear cushion 28 is fastened to the cushion bracket 62 by a cushion fixing bolt 65 inserted through the left and right cushion fixing holes 63a and the upper end portion 28a in the vehicle width direction.

A notch portion 66 is provided in a portion of the upper plate portion 64 of the cushion bracket 62 that overlaps the upper end portion 28a of the rear cushion 28 from above. The notch portion 66 is formed by notching the rear edge of the upper plate portion 64 forward, and is positioned at the rear portion of the upper plate portion 64 .
Accordingly, when the rear cushion 28 is assembled, the upper end portion 28a of the rear cushion 28 and the cushion fixing bolt 65 can be viewed from above through the cutout portion 66, so that the rear cushion 28 can be easily assembled.

FIG. 10 is a left side view showing the structure around the swing arm 13. As shown in FIG.
The swing arm 13 includes an arm portion 13a extending longitudinally along one side (left side) of the rear wheel 3 and an arm portion 13b extending longitudinally along the other side (right side) of the rear wheel 3 (Fig. 1). ) and a connection portion 13c that connects the arm portion 13a and the arm portion 13b in the vehicle width direction in front of the rear wheel 3. As shown in FIG.
The drive chain 35c passes above and below the left arm portion 13a to connect the drive sprocket 35a and the driven sprocket 35b.
The drive chain 35c has a chain upper portion 35c1 passing above the arm portion 13a and a chain lower portion 35c2 passing below the arm portion 13a.

A chain slider 67 that receives the chain lower portion 35c2 from above and below is provided in front of the driven sprocket 35b in the lower portion of the rear portion of the arm portion 13a. The chain slider 67 receives the running lower chain portion 35c2 in the vertical direction, thereby reducing the vertical deflection of the lower chain portion 35c2.

The chain cover 43 is attached to the arm portion 13a. The chain cover 43 includes an outer wall portion 43a that covers the chain upper portion 35c1 from the outside in the vehicle width direction, an inner wall portion 43b that covers the chain upper portion 35c1 from the inside in the vehicle width direction, and an upper edge of the outer wall portion 43a and an upper edge of the inner wall portion 43b. and an upper wall portion 43c connected in the vehicle width direction.
The upper wall portion 43c covers the chain upper portion 35c1 from above.
The upper wall portion 43c is provided with an opening portion 43d that vertically penetrates the upper wall portion 43c. The opening 43d has a slit shape elongated in the front-rear direction. The opening 43d is provided in an intermediate portion between the drive sprocket 35a (FIG. 1) and the driven sprocket 35b in the front-rear direction.

A measuring tool 46 for measuring the slackness of the drive chain 35c is inserted into the opening 43d from above by an operator or the like to measure the slackness in the upper and lower portions of the chain upper portion 35c1. The measuring tool 46 is, for example, a ruler. Since the measuring tool 46 inserted into the opening 43d measures the slackness of the chain upper portion 35c1 in the intermediate portion between the drive sprocket 35a and the driven sprocket 35b, the slackness can be measured appropriately. In addition, since the chain upper portion 35c1 is less affected by the chain slider 67 than the chain lower portion 35c2, the looseness of the drive chain 35c can be properly measured by the measuring tool 46.

1 to 4, the left hanger portion 50L includes a hanger plate 70L (hanger extension portion) provided on the left downward extension portion 19a1 of the lower frame 19 and a tubular member 76 (see FIG. 11) to be described later. ).
The right hanger portion 50R includes a hanger plate 70R (hanger extension portion) provided on the right downward extension portion 19a1 of the lower frame 19, and a tubular member 77 (FIG. 11), which will be described later.

The hanger plate 70L and the hanger plate 70R are plate members arranged with the plate thickness direction oriented in the vehicle width direction. The hanger plate 70L and the hanger plate 70R are plate members elongated vertically along the downward extension portion 19a1. The hanger plate 70</b>L and the hanger plate 70</b>R are extensions that extend rearward from the lower frame 19 toward the engine 11 .
The front edge portion of the hanger plate 70L and the front edge portion of the hanger plate 70R are welded to the vehicle width direction inner surface of the downwardly extending portion 19a1 of the lower frame 19, respectively. A rear portion of the hanger plate 70L and a rear portion of the hanger plate 70R extend rearward from the rear surface of the downward extending portion 19a1 in a vehicle side view.

The right hanger plate 70R includes an upper hanger 71 that supports the upper front portion of the crankcase 31, a lower hanger 72 that supports the lower front portion of the crankcase 31, and the upper hanger 71 and the lower hanger 72. It is a plate member integrally provided with connecting portions 73 that connect vertically. The hanger plate 70R also includes a cover stay 74 extending inward in the vehicle width direction from the connection portion 73 .

The left hanger plate 70L is provided substantially symmetrically with the right hanger plate 70R. That is, the left hanger plate 70</b>L includes an upper hanger 71 , a lower hanger 72 , a connecting portion 73 and a cover stay 74 .
A front portion of the undercover 42 ( FIG. 1 ) is fastened to left and right cover stays 74 .

11 is a cross-sectional view taken along line XI-XI of FIG. 1. FIG. FIG. 11 is a cross section of the upper hanger 71 in the hanger portions 50L and 50R.
1 to 4 and 11, the crankcase 31 of the engine 11 is fastened to the hanger portions 50L, 50R by fasteners 80 inserted through the hanger portions 50L, 50R and the crankcase 31. As shown in FIG. The axial direction of the fastener 80 is the vehicle width direction.

A fixing hole 90 through which the fastener 80 is inserted is provided at the front end of the crankcase 31 . The fixing hole portion 90 is a hole portion that penetrates the crankcase 31 in the vehicle width direction.
One end surface of the fixing hole portion 90 in the axial direction of the fixing hole portion 90 is a one-side contact portion 90a that contacts the hanger portion 50L. The other end surface of the fixing hole portion 90 in the axial direction of the fixing hole portion 90 is the other side contact portion 90b that contacts the hanger portion 50R.

The crankcase 31 is a left-right split crankcase that is divided into two parts, left and right. The crankcase 31 is formed in a case shape by joining a left side case 91 and a right side case 92 together at a mating surface 93 .
The mating surface 93 is positioned at the center in the vehicle width direction. The one side case 91 and the other side case 92 are fastened together by a plurality of crankcase fixing bolts (not shown) extending in the vehicle width direction.

The one side case 91 and the other side case 92 are castings manufactured using a mold.
The one-side case 91 has a one-side hole 91a extending in the vehicle width direction.
The other side case 92 is provided with the other side hole portion 92a extending in the vehicle width direction.
In casting, the direction in which the one-side case 91 and the other-side case 92 are extracted from the mold is the vehicle width direction and is perpendicular to the mating surface 93 .

The one-side hole portion 91a and the other-side hole portion 92a are tapered holes whose diameters decrease from the mating surface 93 toward the outside in the vehicle width direction.
The fixed hole portion 90 is a hole portion formed by joining one side hole portion 91a and the other side hole portion 92a in the vehicle width direction.
That is, the diameter of the fixing hole portion 90 decreases from the mating surface 93 side toward the one-side contact portion 90a.
The diameter of the fixing hole portion 90 decreases from the mating surface 93 side toward the other side contact portion 90b.

The fastener 80 includes a bolt 81 inserted through the hangers 50L, 50R and the crankcase 31 in the vehicle width direction, and a nut 82 screwed onto the tip of the bolt 81 .
The bolt 81 includes a shaft portion 81a inserted through the hanger portions 50L and 50R and the crankcase 31, and a bolt head portion 81b formed at the base end portion of the bolt 81. As shown in FIG. The bolt head portion 81b has a larger diameter than the shaft portion 81a. A male screw portion 81c to which a nut 82 is fastened is provided at the tip of the shaft portion 81a.

The cylindrical member 76 of the left hanger portion 50L is a cylindrical spacer sandwiched between the hanger plate 70L and the one side contact portion 90a of the fixing hole portion 90. As shown in FIG.
The tubular member 76 is provided with a hole 76a passing through the tubular member 76 in the vehicle width direction.
The inner end surface of the tubular member 76 in the vehicle width direction is an end portion 76b that contacts the one-side contact portion 90a in the axial direction of the fastener 80 . The outer end surface 76c of the tubular member 76 in the vehicle width direction contacts the inner surface of the hanger plate 70L in the vehicle width direction.

The hanger plate 70L has a hole 70a passing through the hanger plate 70L in the vehicle width direction. Hole 70 a overlaps hole 76 a of tubular member 76 .
A hole portion 50a through which the fastener 80 is inserted in the hanger portion 50L is formed by a hole 76a and a hole 70a.

The tubular member 77 of the right hanger portion 50R is a cylindrical spacer sandwiched between the hanger plate 70R and the other side contact portion 90b of the fixing hole portion 90. As shown in FIG.
The tubular member 77 has a hole 77a passing through the tubular member 77 in the vehicle width direction.
The inner end surface of the tubular member 77 in the vehicle width direction is an end portion 77b that contacts the other side contact portion 90b of the fastener 80 in the axial direction. The outer end surface 77c of the tubular member 77 in the vehicle width direction contacts the inner surface of the hanger plate 70R in the vehicle width direction.

The hanger plate 70R includes a hole 70b passing through the hanger plate 70R in the vehicle width direction. The hole 70b overlaps the hole 77a of the tubular member 77. As shown in FIG.
A hole portion 50b through which the fastener 80 is inserted in the hanger portion 50R is formed by a hole 77a and a hole 70b.

The bolt 81 is inserted through the hole portion 50b of the hanger portion 50R from the outside in the vehicle width direction. The shaft portion 81a of the bolt 81 passes through the hole portion 50b, the fixing hole portion 90, and the hole portion 50a, and the male thread portion 81c protrudes from the hanger portion 50L to the outside of the vehicle width. The nut 82 is attached to the externally threaded portion 81c from the outside in the vehicle width direction.
When the bolt 81 and the nut 82 are fastened, the bolt head 81b contacts the hanger plate 70R from the outside in the vehicle width direction, and the nut 82 contacts the hanger plate 70L from the outside in the vehicle width direction. A washer 78 is interposed between the nut 82 and the hanger plate 70L.
The fixing hole portion 90 of the crankcase 31 is sandwiched between the hanger portion 50R and the hanger portion 50L by the fastening force between the bolt 81 and the nut 82 .

A concave portion 95 recessed radially inward of the bolt 81 is provided at a portion of the outer circumference 81d of the shaft portion 81a of the bolt 81 where the inner circumference 90a1 of the one-side contact portion 90a of the fixing hole portion 90 overlaps.
The recess 95 is provided along the entire circumference of the shaft portion 81a in one section of the bolt 81 in the axial direction. The recess 95 is formed by cutting the outer circumference 81d of the bolt 81 by machining, for example. The recess 95 forms a small-diameter portion in which a part of the outer circumference 81d of the bolt 81 has a small diameter.

An inner periphery 90a1 of the one-side contact portion 90a of the crankcase 31 overlaps the recess 95 from the periphery. A chamfered portion 98 is provided on the inner periphery 90a1. The chamfered portion 98a is a slanted surface formed by cutting the edge of the inner periphery 90a1.
The inner periphery of the end portion 76b of the tubular member 76 also overlaps the recess 95 from the periphery.
That is, the recess 95 is provided across the fixing hole 90 of the crankcase 31 and the hole 76 a of the tubular member 76 in the axial direction of the bolt 81 .

The recess 95 is provided near the nut 82 and at a position spaced from the nut 82 in the axial direction of the bolt 81 .
The shaft portion 81 a of the bolt 81 has a fitting portion 81 e having a larger diameter than the outer diameter of the recess 95 between the nut 82 and the recess 95 .
The fitting portion 81e is inserted through the hole 50a of the hanger portion 50L and fitted into the hole 76a of the cylindrical member 76. As shown in FIG. Therefore, the tubular member 76 can be positioned in the fitting portion 81e with high accuracy in the radial direction.

A concave portion 96 recessed inward in the radial direction of the bolt 81 is provided at a portion of the outer circumference 81d of the shaft portion 81a of the bolt 81 where the inner circumference 90b1 of the other side contact portion 90b of the fixing hole portion 90 overlaps.
The recessed portion 96 is provided along the entire circumference of the shaft portion 81a in one section of the bolt 81 in the axial direction. The recess 96 is formed by cutting the outer circumference 81d of the bolt 81 by machining, for example. The recess 96 forms a small-diameter portion in which a part of the outer circumference 81d of the bolt 81 has a small diameter.

An inner circumference 90b1 of the other side contact portion 90b of the crankcase 31 overlaps the recess 96 from the periphery. A chamfered portion 98b is provided on the inner periphery 90b1. The chamfered portion 98b is a slanted surface formed by cutting the edge of the inner periphery 90b1.
The inner periphery of the end portion 77b of the tubular member 77 also overlaps the recess 96 from the periphery.
That is, the recess 96 is provided across the fixing hole 90 of the crankcase 31 and the hole 77a of the tubular member 77 in the axial direction of the bolt 81 .

The recess 96 is provided near the bolt head 81b and spaced apart from the bolt head 81b in the axial direction of the bolt 81. As shown in FIG.
The shaft portion 81 a of the bolt 81 has a fitting portion 81 f larger in diameter than the outer diameter of the recess 96 between the bolt head 81 b and the recess 96 .
The fitting portion 81f is inserted through the hole 50b of the hanger portion 50R and fitted into the hole 77a of the cylindrical member 77. As shown in FIG. Therefore, the tubular member 77 can be positioned in the fitting portion 81f in the radial direction with high accuracy.
The outer circumference 81d of the shaft portion 81a of the bolt 81 has substantially the same diameter over the entire length of the shaft portion 81a except for the portions where the recesses 95 and 96 are provided.

The inner diameter d1 of the fixing hole portion 90 of the crankcase 31 is larger than the inner diameter d2 of the hole portion 50a of the hanger portion 50L. Here, the inner diameter d1 is the inner diameter of the inner circumference 90a1.
Moreover, the inner diameter d3 of the fixing hole portion 90 is larger than the inner diameter d4 of the hole portion 50b of the hanger portion 50R. Here, the inner diameter d3 is the inner diameter of the inner circumference 90b1.

The vehicle body frame 10 is flexed due to the load caused by the running of the motorcycle 1 or the like. When the body frame 10 bends, the clearance between the outer circumference 81d of the bolt 81 and the inner circumference of the fixing hole portion 90 of the crankcase 31 may become small.
In the motorcycle 1, a concave portion 95 is provided at a portion of the outer circumference 81d of the bolt 81 where the inner circumference 90a1 of the one-side contact portion 90a overlaps from the circumference. As a result, a large clearance can be secured between the outer periphery 81d of the bolt 81 and the inner periphery 90a1 at the portion of the recess 95, so that the vehicle body frame 10 can be allowed to flex, and the outer periphery 81d of the bolt 81 and the one-side contact portion 90a can be separated. It is possible to reduce the concentration of the load generated between the inner periphery 90a1.
Similarly, in the motorcycle 1, a concave portion 96 is provided at a portion of the outer circumference 81d of the bolt 81 where the inner circumference 90b1 of the other-side contact portion 90b overlaps. As a result, a large clearance can be secured between the outer circumference 81d and the inner circumference 90b1 of the bolt 81 at the portion of the recess 96, so that the vehicle body frame 10 can be allowed to flex, and the outer circumference 81d of the bolt 81 and the contact portion 90b on the other side can be separated. It is possible to reduce concentration of load generated between the inner periphery 90b1.

Also, the inner periphery of the end portion 76 b of the tubular member 76 overlaps the recess 95 . Therefore, at the recess 95, a large clearance can be secured between the outer circumference 81d of the bolt 81 and the inner circumference of the end portion 76b.
The inner circumference of the end portion 77 b of the tubular member 77 overlaps the recess 96 . Therefore, at the recess 96, a large clearance can be secured between the outer circumference 81d of the bolt 81 and the inner circumference of the end portion 77b.
The recess 95 is spaced from the nut 82 . Therefore, it is possible to secure strength in the vicinity of the portion of the bolt 81 to which the nut 82 is fastened.
The recess 96 is separated from the bolt head 81b. Therefore, the strength of the bolt 81 in the vicinity of the bolt head 81b can be ensured.

The tubular member 76 is sandwiched between the hanger plate 70L and the fixing hole 90 , and the tubular member 77 is sandwiched between the hanger plate 70R and the fixing hole 90 . The tubular members 76 and 77 are not joined to the hanger plates 70L and 70R by welding or the like, and can be replaced by releasing the fastening with the fasteners 80. As shown in FIG. The material, outer diameter, and inner diameter of the tubular members 76, 77 may be arbitrarily changed to adjust the rigidity of the hanger portions 50L, 50R.

FIG. 11 is a cross section of the upper hanger 71 portion of the hanger portions 50L, 50R. Fixed. Therefore, description of the supporting structure of the crankcase 31 in the lower hanger 72 is omitted.

As described above, according to the embodiment to which the present invention is applied, the motorcycle 1 includes the body frame 10, the engine 11 supported by the body frame 10, and the engine 11 provided on the body frame 10 and fastened to the engine 11. and fasteners 80 that are inserted through the hanger portions 50L, 50R and the engine 11 to fasten the hanger portions 50L, 50R and the engine 11. The engine 11 is inserted through the fasteners 80. The fixing hole portion 90 includes one side contact portion 90a and the other side contact portion 90b that contact the hanger portions 50L and 50R in the axial direction of the fastener 80. As shown in FIG. A concave portion 95 that is recessed radially inward of the fastener 80 is provided at a portion of the outer circumference 81 d of the fastener 80 where the inner circumference 90 a 1 of the one-side contact portion 90 a overlaps from the periphery. A concave portion 96 that is recessed inward in the radial direction of the fastener 80 is provided at a portion of the outer circumference 81d of the fastener 80 where the inner circumference 90b1 of the other-side contact portion 90b overlaps.
According to this configuration, even when the body frame 10 is bent, a large clearance between the outer circumference 81d of the fastener 80 and the fixing hole portion 90 of the engine 11 can be ensured by the concave portions 95 and 96 . Therefore, the bending of the vehicle body frame 10 can be allowed, and the concentration of load generated between the fastener 80 and the fixing hole portion 90 of the engine 11 can be reduced.

The hanger portion 50L also includes an end portion 76b that contacts the one-side contact portion 90a in the axial direction of the fastener 80, and the inner circumference of the end portion 76b overlaps the recessed portion 95 from the periphery. The hanger portion 50R includes an end portion 77b that contacts the other side contact portion 90b in the axial direction of the fastener 80, and the inner periphery of the end portion 77b overlaps the recess 96 from the periphery.
According to this configuration, a large clearance can be secured between the inner circumferences of the ends 76b and 77b of the hanger portions 50L and 50R and the outer circumference 81d of the fastener 80 by the recesses 95 and 96. Therefore, the fastener 80 and the hanger portions 50L and 50R It is possible to reduce the concentration of the load generated between the end portions 76b and 77b. In addition, since the concave portions 95 and 96 are elongated in the axial direction of the fastener 80, it is easy to secure a clearance between the outer circumference 81d of the fastener 80 and the fixing hole portion 90 of the engine 11.
The hanger portions 50L and 50R are provided with holes 50a and 50b through which the fastener 80 is inserted. It has parts 81e and 81f.
According to this configuration, even in the configuration in which the concave portions 95 and 96 are provided, the fitting portions 81e and 81f are fitted into the holes 50a and 50b so that the holes 50a and 50b and the outer circumference 81d of the fastener 80 It is possible to reduce rattling with. Moreover, the strength and rigidity of the fastener 80 can be ensured by the fitting portions 81e and 81f having diameters larger than the outer diameters of the recesses 95 and 96. As shown in FIG.

Furthermore, the inner diameters d1, d3 of the fixing hole 90 are larger than the inner diameters d2, d4 of the holes 50a, 50b.
With this configuration, a larger clearance can be secured between the outer circumference 81d of the fastener 80 and the inner circumferences 90a1 and 90b1 of the fixing hole 90, and the load generated between the fastener 80 and the fixing hole 90 of the engine 11 can be increased. concentration can be reduced.
A chamfered portion 98a is provided on the inner circumference 90a1 of the one-side contact portion 90a of the fixing hole portion 90. As shown in FIG. A chamfered portion 98b is provided on an inner circumference 90b1 of the other side contact portion 90b of the fixing hole portion 90 .
Therefore, a large clearance between the outer circumference 81d of the fastener 80 and the inner circumferences 90a1 and 90b1 of the fixing hole portion 90 can be secured by the chamfered portions 98a and 98b.

In addition, the fixing hole portion 90 is sandwiched between the pair of hanger portions 50L and 50R by the fastening force of the fastener 80, and the one-side contact portion 90a and the other-side contact portion 90b form the axis of the fixing hole portion 90. The concave portions 95 and 96 are provided at positions overlapping the one side contact portion 90a and the other side contact portion 90b, respectively.
According to this configuration, a large clearance can be secured between the one-side contact portion 90a and the other-side contact portion 90b at both axial ends of the fixing hole portion 90 and the outer circumference 81d of the fastener 80 .
Further, the fastener 80 includes a bolt 81. The bolt 81 includes a shaft portion 81a inserted through the hanger portions 50L, 50R and the fixing hole portion 90, and a bolt head abutting on the hanger portion 50R in the axial direction of the fastener 80. The recess 96 is located axially of the fastener 80 from the bolt head 81b in the shaft portion 81a.
According to this configuration, since the recess 96 is spaced apart from the bolt head 81b in the axial direction of the fastener 80, the strength and rigidity of the connecting portion between the bolt head 81b and the shaft portion 81a can be ensured.

Further, the fastener 80 includes a nut 82 screwed onto the shaft portion 81a of the bolt 81, the nut 82 abuts the hanger portion 50L in the axial direction of the fastener 80, and the recess 95 is formed in the shaft portion 81a of the nut 82. are axially spaced from the fastener 80 .
According to this configuration, since the recessed portion 95 is spaced apart from the nut 82 in the axial direction of the fastener 80, the strength and rigidity of the connecting portion between the nut 82 and the shaft portion 81a can be ensured.
The hanger portions 50L and 50R are interposed between the hanger plates 70L and 70R, which are extension portions extending from the vehicle body frame 10, the one-side contact portion 90a and the hanger plate 70L, and the fastener 80 and a tubular member 77 interposed between the other side contact portion 90b and the hanger plate 70R and through which the fastener 80 is inserted.
According to this configuration, in the axial direction of the fastener 80, the tubular member 76 can separate the recess 95 from the hanger plate 70L, and the tubular member 77 can separate the recess 96 from the hanger plate 70R. . Therefore, the concave portions 95 and 96 can be separated from the ends of the fastener 80, and the strength of the fastener 80 can be ensured.

In addition, the above-described embodiment shows one mode to which the present invention is applied, and the present invention is not limited to the above-described embodiment.
In the above embodiment, the engine 11, which is an internal combustion engine, is taken as an example of the power unit, but the power unit is not limited to this, and may be an electric motor unit that drives the wheels of an electric vehicle.
In the above embodiment, the bolt 81 is inserted through the hole 50b of the right hanger portion 50R from the outside in the vehicle width direction, and the nut 82 is provided on the left hanger portion 50L side. The invention is not limited to this. For example, the bolt 81 may be inserted through the hole 50a of the left hanger portion 50L from the outside in the vehicle width direction, and the nut 82 may be provided on the right hanger portion 50R side.
Further, in the above embodiment, the motorcycle 1 has been described as an example, but the present invention is not limited to this, and the present invention is applicable to a three-wheeled vehicle having two front wheels or two rear wheels and a four-wheeled vehicle. Applicable to vehicles with wheels or more.

1 Motorcycles (vehicles)
10 body frame 11 engine (power unit)
50L, 50R hanger portion 50a, 50b hole portion 70L, 70R hanger plate (hanger extension portion)
76, 77 cylindrical member 76b, 77b end 80 fastener 81 bolt 81a shaft 81b bolt head 81d outer circumference 81e, 81f fitting portion 82 nut 90 fixing hole 90a one side contact portion (contact portion)
90a1, 90b1 Inner periphery 90b Other side contact portion (contact portion)
95, 96 recesses 98a, 98b chamfered portions d1, d3 inner diameter (inner diameter of fixing hole)
d2, d4 inner diameter (inner diameter of hole)

Claims (8)

A vehicle body frame (10), a power unit (11) supported by the vehicle body frame (10), and hanger portions (50L, 50R) provided on the vehicle body frame (10) and fastened to the power unit (11). , a fastener (80) inserted through the hanger portions (50L, 50R) and the power unit (11) to fasten the hanger portions (50L, 50R) and the power unit (11),
The power unit (11) has a fixing hole (90) through which the fastener (80) is inserted,
The fixing hole (90) includes contact portions (90a, 90b) that contact the hanger portions (50L, 50R) in the axial direction of the fastener (80),
A concave portion recessed inward in the radial direction of the fastener (80) is provided in the outer circumference (81d) of the fastener (80) where the inner circumferences (90a1, 90b1) of the contact portions (90a, 90b) overlap from the periphery. (95, 96) are provided ,
The hanger portions (50L, 50R) have holes (50a, 50b) through which the fasteners (80) are inserted,
A vehicle , wherein inner diameters (d1, d3) of said fixing hole (90) are larger than inner diameters (d2, d4) of said holes (50a, 50b) . The hanger portions (50L, 50R) have ends (76b, 77b) that contact the contact portions (90a, 90b) in the axial direction of the fastener (80),
Vehicle according to claim 1, characterized in that the inner periphery of said end (76b, 77b) overlaps said recess (95, 96) from its periphery. The fastener (80) is provided with fitting portions (81e, 81f) having a larger diameter than the outer diameter of the recesses (95, 96) in the holes (50a, 50b). 3. A vehicle according to item 1 or 2. 4. Chamfered portions (98a, 98b) are provided on the inner circumferences (90a1, 90b1 ) of the contact portions (90a, 90b) in the fixing hole portion (90). Any vehicle described. The fixing hole (90) is sandwiched between the pair of hangers (50L, 50R) by the fastening force of the fastener (80),
The contact portions (90a, 90b) are provided at both axial ends of the fixing hole (90),
The vehicle according to any one of claims 1 to 4 , wherein the recesses (95, 96) are provided at positions overlapping the contact portions (90a, 90b) at both ends. said fastener (80) comprises a bolt (81);
The bolt (81) includes a shaft portion (81a) inserted through the hanger portions (50L, 50R) and the fixing hole portion (90), and the hanger portion (50L, 50L, 50L, 50L, 81a) extending in the axial direction of the fastener (80). 50R) and a bolt head (81b) abutting on the
2. From claim 1, wherein said recesses (95, 96) are located in said shank (81a) at a position spaced axially of said fastener (80) from said bolt head (81b). 6. The vehicle according to any one of 5 . The fastener (80) includes a nut (82) screwed onto the shaft (81a) of the bolt (81), and the nut (82) extends axially from the hanger (80). abut on the part (50L, 50R),
Vehicle according to claim 6 , characterized in that said recesses (95, 96) are arranged at positions spaced from said nut (82) in the axial direction of said fastener (80) on said shaft portion (81a). . The hanger portions (50L, 50R) include hanger extension portions (70L, 70R) extending from the vehicle body frame (10), contact portions (90a, 90b), and hanger extension portions (70L, 70R). ) and through which the fastener (80) is inserted.

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