JP5328415B2 - Engine suspension structure for motorcycles - Google Patents

Description

  The present invention relates to an improvement in an engine suspension structure of a motorcycle.

  2. Description of the Related Art An engine suspension structure for a motorcycle having a down tube to which a front portion of an engine is attached to a vehicle body frame is known (see, for example, Patent Document 1 (FIG. 2)).

  In FIG. 2 of Patent Document 1, one down tube 6 (symbol is diverted from the same publication; hereinafter the same) is extended downward at the front portion of the vehicle body. 7 is attached, and the front portion of the engine 1 is attached to the mount plate 7.

  However, the front portion of the engine 1 is attached to the lower end portion of one down tube 6 via the mount plate 7. For this reason, in the case where the weight of the engine changes due to a model change or the like, it is preferable to have an engine suspension structure for a motorcycle that can easily increase the rigidity on the body frame side.

JP-A-6-247365

  An object of the present invention is to provide an engine suspension structure for a motorcycle that can increase rigidity.

According to a first aspect of the present invention, there is provided a vehicle body frame, an engine suspended on the vehicle body frame, a down frame that constitutes a part of the vehicle body frame and extends vertically to the front portion of the vehicle body frame, 2. Description of the Related Art In an engine suspension structure for a motorcycle provided with a hanger portion formed on an engine and a mount plate for mounting the engine on a vehicle body frame, two down frames hang down in the width direction of the vehicle. The mounting plate is open to the hanger part side and has a U-shaped cross section having left and right side surfaces, and is mounted so as to be sandwiched between two down frames, and the left and right side surfaces of the mounting plate a looped by the cross member, the down frame, provided with the collar member having a hole passing through in the horizontal direction And a mount plate fastening member that passes through the hole of the collar member and the cross member and fastens between the outer end portions of the two down frames, and the cross member is mounted between the two down frames. It extends from the left and right side surfaces to the outer side in the vehicle width direction, and is formed so as to contact the inner side surface of the collar member of the down frame .

The invention according to claim 2, characterized in that between the mount plate and the hanger portion, while holding the hanger portion at the mounting plate, the engine hanger fastening members for fastening the outer end portions of the mounting plate is provided And

  The invention according to claim 3 is characterized in that a recess that avoids interference with an exhaust pipe extending from the engine is formed in the front portion of the cross member.

The invention according to claim 4 is characterized in that an opening is formed in a front wall portion facing the front of the vehicle constituting the mount plate.
According to a fifth aspect of the present invention, there is provided a vehicle body frame, an engine suspended on the vehicle body frame, a down frame that constitutes a part of the vehicle body frame and extends vertically to the front portion of the vehicle body frame, and the down frame 2. Description of the Related Art In an engine suspension structure for a motorcycle provided with a hanger portion formed on an engine and a mount plate for mounting the engine on a vehicle body frame, two down frames hang down in the width direction of the vehicle. The mounting plate is open to the hanger part side and has a U-shaped cross section having left and right side surfaces, and is mounted so as to be sandwiched between two down frames, and the left and right side surfaces of the mounting plate Is recessed by the cross member and avoids interference with the exhaust pipe extending from the engine at the front of the cross member. Wherein the but has been formed.
According to a sixth aspect of the present invention, there is provided a vehicle body frame, an engine suspended on the vehicle body frame, a down frame that constitutes a part of the vehicle body frame and extends vertically to the front portion of the vehicle body frame, 2. Description of the Related Art In an engine suspension structure for a motorcycle provided with a hanger portion formed on an engine and a mount plate for mounting the engine on a vehicle body frame, two down frames hang down in the width direction of the vehicle. The mounting plate is open to the hanger part side and has a U-shaped cross section having left and right side surfaces, and is mounted so as to be sandwiched between two down frames, and the left and right side surfaces of the mounting plate The opening is formed in the front wall that faces the front of the vehicle constituting the mount plate. And wherein the Rukoto.

In the invention according to claim 1, the two down frames are connected by the mount plate, and the engine is suspended on the mount plate.
Since the two down frames are connected by the mount plate, the bending rigidity and torsional rigidity of the down frame can be increased when the engine is suspended.

  In addition, since the left and right side surfaces of the mount plate are spanned by the cross member, the rigidity of the mount plate itself is increased. If the rigidity of the mount plate is increased, the resonance of the down frame can be suppressed, and the driving comfort can be improved. In addition, the rigidity of the entire body frame can be increased.

  In the invention which concerns on Claim 2, the mount plate fastening member which penetrates a down frame, a mount plate, and a cross member between the down frame and a mount plate, and fastens between the outer both ends of two down frames is provided. Because the mount plate is fastened in the direction that the mount plate is sandwiched between the down frames with the mount plate fastening member, the mount plate exhibiting a U-shaped cross section that opens to the hanger side is opened outward. Can be made difficult.

  Moreover, since one mount plate fastening member is penetrated, it is possible to reduce the number of parts and the man-hour for tightening.

  In the invention according to claim 3, since the concave portion is formed in the front portion of the cross member, even when the cross member is arranged in the vicinity of the exhaust pipe, it is difficult to affect the degree of freedom in handling the exhaust pipe. can do.

In the invention which concerns on Claim 4 , since the opening part is formed in the front wall part of a mount plate, weight reduction of a mount plate can be achieved. In addition, traveling wind can be applied to the engine disposed behind the mount plate through the opening. Even when the mount plate is disposed in front of the engine, the cooling performance of the engine can be hardly impaired, and the engine can be effectively cooled.

1 is a left side view of a motorcycle according to the present invention. 1 is a left side view of a main part of a motorcycle according to the present invention. FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 1 is a front view of a mount plate provided in an engine suspension structure of a motorcycle according to the present invention. 1 is a perspective view of an engine suspension structure of a motorcycle according to the present invention. It is another Example figure of FIG. FIG. 6 is a diagram showing still another embodiment of FIG. 5.

  Hereinafter, embodiments of the present invention will be described in detail. In the drawings and examples, “up”, “down”, “front”, “rear”, “left”, and “right” respectively indicate directions viewed from the driver who rides the motorcycle. The drawings are viewed in the direction of the reference numerals.

  In FIG. 1, a motorcycle 10 is provided with a body frame 11, an engine 12 is disposed at a substantially central portion of the body frame 11, and a front fork 13 is steerably provided at the front end of the body frame 11. A swing arm 14 is provided at the lower part of the rear portion of 11 so as to swing up and down.

  The vehicle body frame 11 includes a head pipe 16, left and right main frames 17L and 17R extending rearward and downward from the head pipe 16 (only the front side reference numeral 17L is shown, the same applies hereinafter), and the left and right main frames The left and right down frames 18L and 18R (only the front side reference numeral 18L is shown. The same applies hereinafter) disposed on the lower side of the frames 17L and 17R and extending rearward and downward from the head pipe 16, and the main frame 17L. Seat rails 19L and 19R (only the front side 19L is shown. The same applies hereinafter) and rear ends of the main frames 17L and 17R. Pivot plates 23L and 23R having a pivot shaft 22 (only the reference numeral 23L on the front side is shown; the same applies hereinafter), Over preparative 23L, 23R and the seat rail 19L, the sub-frame 25L to be stretched between the intermediate portion of the 19R, and 25R (showing only the near side of the code 25L. Hereinafter the same.), It is referred to as main components.

  26L and 26R (only the reference numeral 26L on the front side is shown. The same applies hereinafter) is provided obliquely in front of the engine 12 and is spanned between the main frames 17L and 17R and the down frames 18L and 18R, and has a substantially V shape in side view. These are auxiliary frames 27L and 27R (only the reference numeral 27L on the near side is shown.

  The head pipe 16 is a member that supports the front fork 13 to be steerable. A steering handle 31 is attached to the upper part of the front fork 13, and a front wheel 32 is attached to the lower part of the front fork 13.

  A swing arm 14 that rotatably supports a rear wheel 34 as a driving wheel is extended to the rear end of the pivot plates 23L and 23R, and a rear cushion 36L is provided between the front end 35 of the swing arm and the sub frames 25L and 25R. , 36R (only the front side code 36L is shown. The same applies hereinafter).

  The body frame 11 supports the front wheel 32 in a steerable manner and supports the rear wheel 34 in a swingable manner, and suspends the engine 12 between the front wheel 32 and the rear wheel 34. A fuel tank 38 and an occupant seat 39 are attached to the upper part of the frame 11.

Specifically, the fuel tank 38 for storing fuel is attached so as to straddle the front portion of the main frame 22.
The occupant seat 71 is supported by the seat rails 19L and 19R, and the left and right seat rails 19L and 19R are attached with a rear grip 41 that can be grasped while the occupant is traveling, and a part of the seat rails 19L and 19R. A rear cover member 42 that covers a part of the rear grip 41 is provided.

A mount plate 44 is attached to the lower ends of the down frames 18L and 18R, and the front portion of the engine 12 is suspended via the mount plate 44.
In the present embodiment, the down frames 18L and 18R as the constituent members of the body frame use tube members (tubes) having a circular cross section. The pipe member may be, for example, an elliptical cross section or a rectangular cross section, and is not limited to a cross sectional shape as long as a predetermined rigidity is ensured. Further, it may be a solid member. The cross-sectional shape of the solid member may be any shape including a circle, an ellipse, and a rectangle.

In the engine 12, a transmission 46 is integrally provided at a rear portion, a cylinder head 49 is provided in a cylinder 48 in which an axis 47 is disposed forwardly, and an intake device 51 is connected to a rear portion of the cylinder head 49, An exhaust device 52 is connected to the front portion of the cylinder head 49. 53 is a cylinder head cover. Since the cylinder axis 47 is inclined forward, the center of gravity of the vehicle body can be kept low, for example, by arranging the fuel tank 38 low.
The direction of the cylinder axis 47 may be a substantially vertical direction.

  The intake device 51 includes an intake pipe 60 having one end connected to the cylinder head 49, a fuel supply device 61 having one end connected to the other end of the intake pipe 60, and a connection to the other end of the fuel supply device 61. The air cleaner 63 is connected through a tube 62.

  The exhaust device 52 has one end connected to the front portion of the cylinder head 49 and extending downward and rearward from the front of the engine 12, and a silencer 66 connected to the other end of the exhaust pipe 65 and extending rearward. .

  In the figure, 56 is a headlight, 57 is an instrument unit, 58 is a front fender, and 59 is a taillight (taillight unit).

Hereinafter, the suspension structure of the engine 12 will be described in detail.
2 to 5, the engine 12 is attached to the vehicle body frame with a hanger portion 55 provided in the engine 12.
The hanger portion 55 includes a front hanger portion 71 provided at the front portion of the engine 12 and a rear hanger portion 72 provided at the rear portion of the engine 12.

  A mount plate 44 is attached to a front hanger portion 71 provided at the front portion of the engine 12 via an engine hanger fastening member 75. The mount plate 44 is attached to the down frames 18L and 18R extending vertically to the front portion of the vehicle body frame 11 via a mount plate fastening member 76. That is, the mount plate 44 is a member that connects the down frames 18L and 18R and the front hanger portion 71 formed on the engine 12 to mount the engine 12 on the vehicle body frame 11.

The engine hanger fastening member 75 includes a hanger bolt 77 and a hanger nut 78. Similarly, the mount plate fastening member 76 includes a mount bolt 81 and a mount nut 82.
A rear hanger portion 72 provided at the rear portion of the engine 12 is suspended from the pivot plates 23L and 23R via a rear hanger fastening member 79.

  The mount plate 44 includes left and right side wall portions 85L and 85R that engage with the front hanger portion 71, a front wall portion 86 spanned between the left and right side wall portions 85L and 85R, and left and right side wall portions 85L and 85R. A tube member 87 which is attached so as to penetrate and is disposed in parallel to the front wall portion 86, and has a U-shaped cross-section opened to the front hanger portion 71 side (the rear side of the vehicle). It is a member exhibiting.

Of the tube member 87 as a constituent member of the mount plate 44, the portion extending between the left and right side wall portions 85 </ b> L and 85 </ b> R can also be referred to as a cross member 88. Since the cross member 88 is passed between the left and right side wall portions 85L and 85R, the rigidity of the mount plate 44 itself can be increased. Since the rigidity of the mount plate 44 itself is increased by the cross member 88, the mounting rigidity of the engine 12 can be increased.
By passing the cross member 88, it is possible to reduce the shape of the mount plate 44 and reduce the thickness of the mount plate 44 to reduce the weight of the entire mount plate.

  In addition, an opening 111 is formed in the front wall portion 86 provided in the mount plate 44. Since the opening 111 is provided, the mount plate 44 can be reduced in weight. Further, it is possible to apply traveling wind to the engine 12 disposed behind the mount plate 44 through the opening 111. Even when the mount plate 44 is disposed in front of the engine 12, the cooling performance of the engine 12 can be made difficult to be impaired, and the engine 12 can be effectively cooled.

In the down frames 18L and 18R, left and right collar members 112L and 112R are attached at positions corresponding to the left and right outer sides of the tube member 87 provided on the mount plate 44.
Then, the mount bolt 81 as a constituent member of the mount plate fastening member 76 is inserted through the right collar member 112R, the tube member 87, and the left collar member 112L in this order, and the construction of the mount plate fastening member 76 from the left collar member 112L side. The mount plate 44 is attached to the down frames 18L and 18R by stopping with a mount nut 82 as a member.

  The mount plate 44 is provided with a front hanger portion 71 that constitutes the front portion of the engine 12 via two engine hanger fastening members 75 and 75 on the inside of the left and right side wall portions 85L and 85R.

  That is, between the down frames 18L, 18R and the mount plate 44, the down frames 18L, 18R and the mount plate 44 are fastened, and through the down frames 18L, 18R, the mount plate 44 and the cross member 88, A mounting plate fastening member 76 that is fastened between both outer ends of the down frames 18L and 18R is provided. The mounting plate 44 and the hanger portion 55 are mounted with the hanger portion 55 sandwiched between the mounting plate 44 and the hanger portion 55. An engine hanger fastening member 75 that is fastened from both outer ends of the plate 44 is provided.

  The down frames 18L and 18R are provided so as to hang down in the width direction of the vehicle, and the mount plate 44 is attached so as to be sandwiched between the two down frames 18L and 18R. The side surfaces 114L and 114R are spanned by a cross member 88.

  Since the mount plate 44 is fastened by the mount plate fastening member 76 in a direction to be sandwiched between the down frames 18L and 18R, the mount plate 44 having a U-shaped cross-section opened to the hanger portion 55 side is opened. There is no worry about being done.

  Further, between the down frames 18L, 18R and the mount plate 44, the down frames 18L, 18R, the mount plate 44 and the cross member 88 are passed through and fastened between the outer end portions of the two down frames 18L, 18R. A mount plate fastening member 76 is provided.

  If the left down frame and the mount plate, the right down frame and the mount plate, and the mount plate and the cross member are fastened by separate fastening members, the number of parts increases. , Labor related to tightening increases.

  In this regard, in the present invention, since the mount plate 44 is attached to the down frames 18L and 18R through one mount plate fastening member 76, it is possible to reduce the number of parts and man-hours for tightening. become.

The mount plate 44 includes a U-shaped portion 116 formed in a U-shape that is open on the hanger portion 55 side. The front hanger portion 71 as a component of the hanger portion is sandwiched by the U-shaped portion 116 from the left and right sides, and the mount plate 44 is attached to the front hanger portion 71.
The front hanger portion 71 is provided at two locations in the upper and lower portions, but the upper and lower portions have the same structure and will not be described.

Hereinafter, a supplementary description will be given of a mounting structure between the front hanger portion 71 and the mount plate 44 formed in the engine 12.
The front hanger portion 71 is provided with a hole 125 for suspending the engine. The inner side surfaces 114L and 114R of the side walls 85L and 85R provided on the U-shaped portion 114 are applied to the outer side surface 71u of the front hanger portion 71, and the side walls 85L and 85R. The hanger bolts 77 of the engine hanger fastening member 75 are inserted into the holes 126 and 126 formed in the holes and fixed with the hanger nut 78 on the other side.

With this configuration, when the mount plate 44 is attached to the hanger portion 52 formed on the engine 12, the hanger bolt 77 and the hanger nut 78 provided on the left and right side wall portions 85L and 85R can be easily handed from the side of the mount plate 44. Can be tightened. Since the left and right side wall portions 85L and 85R can be easily put in, there is no concern that the assembly productivity related to engine suspension will be impaired.
The front hanger portion 71 provided on the lower side has the same configuration and action as the front hanger portion 71 provided on the upper side, and a description thereof will be omitted.

  Hereinafter, a supplementary description will be given of the mounting structure between the down frames 18L and 18R and the mount plate. Cylindrical collar members 112L and 112R having holes 131 and 131 that are penetrated in the horizontal direction and attached by welding and through which the mount plate fastening member 76 passes are provided in the down frames 18L and 18R.

  A hole 87h of a tube member 87 as a component of the mount plate 44 is aligned with the holes 13 and 131 of the collar members 112L and 112R attached to the down frames 18L and 18R, and the mount bolt 81 is inserted into the hole 131 and The mount plate 44 can be easily attached to the down frames 18L and 18R by being inserted into the hole 87h and the hole 131 in this order and tightened with the mount nut 82 from the left outer side.

Hereinafter, a supplementary description will be given of the arrangement relationship between the exhaust pipe and the down frame.
An exhaust pipe 65 is connected to an exhaust port 122 provided on the front surface 121 of the cylinder head constituting the front surface of the engine 12, and the exhaust pipe 65 is formed to extend forward and then bend rearward. At the same time, it is arranged to pass between the two down frames 18L and 18R.

  Conventionally, when one down frame is suspended from the head pipe, the exhaust port formed in the cylinder head is arranged on the side to avoid interference between the exhaust pipe and the down frame. In some cases, an ideal port shape could not be obtained.

On the other hand, in the present invention, even if the exhaust port 122 provided in front of the cylinder head 49 of the engine 12 is formed forward, the exhaust pipe 65 does not interfere with the down frames 18L and 18R. Since it arrange | positions so that it may pass between the down flame | frames 18L and 18R, the influence on the exhaust port shape by the handling of the exhaust pipe 65 can be suppressed as much as possible, and exhaust efficiency can be improved.
In particular, in the case of a vehicle in which the intake device 51 is disposed behind the engine 12, the exhaust port 135 is formed between the two down frames 18L and 18R when the vehicle is viewed from the front, so that the engine is centered when the vehicle is viewed from the top. Since the intake device and the exhaust port can be arranged on a straight line, the engine output can be improved.

  Since the cross member 88 extends integrally from the mount plate 44 in the vehicle width direction so as to abut against the two down frames 18L and 18R, the number of parts can be reduced.

The operation of the engine suspension structure of the motorcycle described above will be described next. 6 to 8, the engine is omitted.
In FIG. 6, two down frames 18 </ b> L and 18 </ b> R are connected by a mount plate 44, and an engine (reference numeral 12 in FIG. 2) is suspended on the mount plate 44. Since the two down frames 18L and 18R are connected by the mount plate 44, when the engine 12 is suspended, the bending rigidity and torsional rigidity of the down frames 18L and 18R can be increased.

  In addition, since the left and right side wall portions 85L and 85R having the side surfaces of the mount plate are spanned by a cross member 88 as a constituent part of the pipe member 87, the rigidity of the mount plate 44 itself is enhanced. If the rigidity of the mount plate 44 is increased, resonance of the down frames 18L and 18R can be suppressed, and driving comfort can be improved. In addition, the rigidity of the entire body frame can be increased.

  The tightening directions of the engine hanger fastening member 75 that fastens the engine 12 to the mount plate 44 and the mount plate fastening member 76 that fastens the mount plate 44 to the down frames 18L and 18R are the same. If the tightening directions coincide with each other, the mount plate 44 is less likely to be twisted. Therefore, it is not necessary to consider that amount, and the mount plate 44 can be made thinner and lighter. .

A recess 133 is formed at the front of the cross member 88 to avoid interference with the exhaust pipe 65 extending from the engine 12.
Since the recess 133 is formed in the front portion of the cross member 88, even when the cross member 88 is disposed in the vicinity of the exhaust pipe 65, it is difficult to affect the degree of freedom in handling the exhaust pipe 65. it can.

In FIG. 7, the main difference from the embodiment is that the upper pipe member 87H of the upper and lower pipe members 87H, 87L is not passed between the left and right side wall portions 85L, 85R. That is, only one cross member 88L is passed between the left and right side wall portions 85L and 85R. In addition, there is no significant difference from the embodiment.
Since only one cross member 88L is passed between the left and right side wall portions 85L and 85R, an increase in the weight of the mount plate 44 can be suppressed while suppressing a decrease in rigidity of the mount plate 44.

  In FIG. 8, the main difference from the embodiment is that the upper and lower pipe members 87H and 87L are not passed between the left and right side wall portions 85L and 85R, and are different from the upper and lower pipe members 87. However, the cross member 88A is passed to a position different from the position where the upper and lower pipe members 87 are passed. There are no other significant differences.

  Although the present invention is applied to a motorcycle in the embodiment, it can also be applied to a tricycle and can be applied to a general saddle type vehicle.

  The present invention is suitable for an engine suspension structure of a motorcycle in which a mount plate is interposed between a vehicle body frame and an engine.

  DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 11 ... Body frame, 12 ... Engine, 18L, 18R ... Down frame, 44 ... Mount plate, 55 ... Hanger part, 65 ... Exhaust pipe, 75 ... Engine hanger fastening member, 76 ... Mount plate fastening member, 86 ... Front wall portion, 88, 88A ... Cross member, 111 ... Opening portion, 114L, 114R ... Side surface of mount plate, 133 ... Concavity.

Claims (6)

A body frame (11), and extends the engine (12) which is suspended on the body frame (11), up and down the front of the vehicle body frame (11) part constitutes the vehicle body frame (11) The down frame (18L, 18R) and the down frame (18L, 18R) and a hanger portion (55) formed on the engine (12) are connected to connect the engine (12) to the vehicle body frame (11) . In the engine suspension structure of a motorcycle provided with a mounting plate (44) for mounting,
The down frames (18L, 18R) are provided so as to hang down in the width direction of the vehicle,
The mount plate (44) is open to the hanger portion (55) side, has a U-shaped cross section having left and right side surfaces, and is mounted so as to be sandwiched between the two down frames (18L, 18R). And the left and right side surfaces of the mount plate (44) are spanned by a cross member (88) ,
The down frame (18L, 18R) is provided with collar members (121L, 121R) having holes (131, 131) penetrating in the horizontal direction,
Mount plate fastening that passes through the holes (131, 131) and the cross member (88) of the collar member (121L, 121R) and fastens between the outer ends of the two down frames (18L, 18R). A member (76) is provided;
The cross member (88) extends outward in the vehicle width direction from the left and right side surfaces of the mount plate (44) between the two down frames (18L, 18R), and the down frame (18L, 18R). The engine suspension structure of the motorcycle is formed so as to contact the inner surface of the collar member (121L, 121R) . Between the front SL and the hanger portion mounting plate (44) (55), said hanger portion (55) in a sandwich state with the mounting plate (44), fastening the outer end portions of the mounting plate (44) The engine suspension structure for a motorcycle according to claim 1, further comprising an engine hanger fastening member (75) . The recessed part (133) which avoids interference with the exhaust pipe (65) extended from the said engine (12 ) is formed in the front part of the said cross member (88) , The Claim 1 or Claim The engine suspension structure of the motorcycle according to 2 . The motorcycle (1) according to any one of claims 1 to 3 , wherein an opening (111) is formed in a front wall (86) facing the front of the vehicle constituting the mount plate (44). Engine suspension structure. A vehicle body frame (11), an engine (12) suspended from the vehicle body frame (11), and a part of the vehicle body frame (11) are formed and extend vertically to the front portion of the vehicle body frame (11). The down frame (18L, 18R) and the down frame (18L, 18R) and a hanger portion (55) formed on the engine (12) are connected to connect the engine (12) to the vehicle body frame (11). In the engine suspension structure of a motorcycle provided with a mounting plate (44) for mounting,
  The down frames (18L, 18R) are provided so as to hang down in the width direction of the vehicle,
  The mount plate (44) is open to the hanger portion (55) side, has a U-shaped cross section having left and right side surfaces, and is mounted so as to be sandwiched between the two down frames (18L, 18R). And the left and right side surfaces of the mount plate (44) are spanned by a cross member (88),
An engine suspension structure for a motorcycle, wherein a recess (133) that avoids interference with an exhaust pipe (65) extending from the engine (12) is formed in a front portion of the cross member (88). . A vehicle body frame (11), an engine (12) suspended from the vehicle body frame (11), and a part of the vehicle body frame (11) are formed and extend vertically to the front portion of the vehicle body frame (11). The down frame (18L, 18R) and the down frame (18L, 18R) and a hanger portion (55) formed on the engine (12) are connected to connect the engine (12) to the vehicle body frame (11). In the engine suspension structure of a motorcycle provided with a mounting plate (44) for mounting,
  The down frames (18L, 18R) are provided so as to hang down in the width direction of the vehicle,
  The mount plate (44) is open to the hanger portion (55) side, has a U-shaped cross section having left and right side surfaces, and is mounted so as to be sandwiched between the two down frames (18L, 18R). And the left and right side surfaces of the mount plate (44) are spanned by a cross member (88),
An engine suspension structure for a motorcycle, wherein an opening (111) is formed in a front wall (86) that faces the front of the vehicle constituting the mount plate (44).

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