JP4265135B2 - Front structure of motorcycle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a front body structure of a motorcycle, and in particular, a case in which an upper portion of a radiator disposed in front of an engine is supported so as to be rotatable in the front-rear direction of the vehicle body, and a lower portion is removably supported. It is suitable for use in.
[0002]
[Prior art]
For example, in Japanese Patent Application Laid-Open No. 2000-177404, a motorcycle equipped with a V-type two-cylinder engine is supported by a vehicle body frame and an engine in front of the engine so as to cover the front upper side of the front cylinder of the engine. It is disclosed to mount a radiator.
[0003]
In this type of motorcycle, when performing maintenance work on the front cylinder of the engine (for example, checking or replacing the spark plug of the front cylinder), the mounting bolts at the lower part of the radiator (engine side) are removed and the lower part of the radiator is moved forward. In this manner, the radiator is rotated about the mounting bolt on the upper part (vehicle body frame side).
[0004]
As a result, the gap between the front cylinder of the engine and the radiator is enlarged, so that a tool such as a plug wrench can be inserted into the gap, and maintenance work of the front cylinder can be easily performed without removing the radiator or the like. It can be carried out.
[0005]
[Problems to be solved by the invention]
By the way, depending on the vehicle type, the front part of the motorcycle body may be covered with a cowling. In this case, in order to efficiently introduce the traveling wind into the radiator, an air guide plate portion disposed substantially perpendicular to the radiator is provided inside the cowling on the left and right sides in front of the radiator.
[0006]
However, if the cowling (wind guide plate) is located in front of the radiator, the radiator will hit the wind guide plate when rotating the radiator as described above, and the radiator cannot be turned any further. A sufficient gap cannot be secured between the front cylinder of the engine and the radiator. For this reason, the cowling must be removed from the vehicle body, or the operator must move the radiator between the right and left wind guide plates while pushing the cowling to the side, resulting in poor workability.
[0007]
The present invention has been made in view of the above points, and an object of the present invention is to improve workability when a radiator is rotated during maintenance work.
[0008]
[Means for Solving the Problems]
A vehicle body front structure of a motorcycle according to the present invention includes an engine including a cylinder supported by a vehicle body frame and arranged to be inclined forward, a radiator disposed in front of the engine, the engine, and the radiator. A motorcycle with a cowling made of an elastically deformable material covering the front of the vehicle body, the upper part of the radiator being supported to be pivotable in the longitudinal direction of the vehicle body, and the lower part being detachably supported. The cowling has a cooling air intake opening to the radiator in front of the radiator, and extends from the front end of the opening to the vicinity of the front surface of the radiator on the left and right sides of the cooling air intake opening. An air guide plate portion for guiding cooling air is provided to the core portion of the radiator, and the rear end of the air guide plate portion extends outward in the left-right direction of the radiator. An inclined portion that is inclined is formed, and the inclined portion of the wind guide plate portion is pressed and expanded in the left-right direction as the radiator rotates, and the radiator is placed forward on the wind guide plate portion of the cowling. It has a feature in that a stopper structure is provided to hold it in a state of being rotated.
[0010]
Another motorcycle front body structure of the present invention includes an engine including a cylinder supported by a body frame and disposed to be inclined forward, a radiator disposed in front of the engine, the engine, and the radiator. A motorcycle made of an elastically deformable material covering a front portion of the vehicle body including a radiator, wherein the upper portion of the radiator is rotatably supported in the longitudinal direction of the vehicle body, and the lower portion is detachably supported. A vehicle body front structure, wherein a reservoir tank is fixed so as to protrude forward to one side in the left-right direction of the radiator, a cowling side forming an outer wall of the cowling, and a radiator opening to the front of the radiator The cooling air flows from the front end of the opening to the vicinity of the front surface of the radiator on both the left and right sides of the cooling air intake port, and enters the core of the radiator The reservoir tank is disposed between the guide air guide plate and the outer shape of the reservoir tank is formed in a curved shape substantially concentric with the upper rotating shaft of the radiator. The outer shape of the reservoir tank is formed on the wind guide plate. And a notch portion having a substantially concentric arc shape, and a feature that the side surface of the reservoir tank is formed flush with the side surface of the air guide plate portion and faces the cooling intake.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a front body structure for a motorcycle according to the present invention will be described below with reference to the drawings.
[0013]
1 and 2 show the overall configuration of the motorcycle according to the present embodiment. First, the overall structure of the motorcycle 100 will be described. Two pieces are supported at the front part of a body frame 101 made of steel or aluminum alloy so as to be turnable left and right by a steering stem inserted in a head pipe. The front fork 102 is provided. A handle bar 103 is fixed to the upper end of the steering stem, a pair of left and right side mirrors 104 are erected on the handle bar 103, and grips 105 are provided at both ends of the handle bar 103. A protector 106 is disposed at the front portion of the grip 105.
[0014]
A front wheel 107 is rotatably supported at the lower portion of the front fork 102, and a front fender 108 is fixed so as to cover the upper portion of the front wheel 107. The front wheel 107 includes a brake disc 109 that rotates integrally with the front wheel 107, and a brake pad 110 that is supported by the front fork 102.
[0015]
The cowling 1 that covers the head pipe, the fuel tank 124, and the like is attached to the front portion of the vehicle body frame 101 above the front wheel 107. The cowling 1 includes an upper screen 112, a headlight 113 at the front end, and the like, and a pair of direction indicator lights (blinkers) 114 project from the left and right outer sides. A meter unit including a speedometer, a tachometer, various indicator lamps, and the like is mounted near the upper portion of the front fork 102 inside the cowling 1.
[0016]
A swing arm 116 is swingably provided on the rear portion of the body frame 101 via a pivot 117, and a rear suspension is mounted between the body frame 101 and the swing arm 116. A rear wheel 118 is rotatably supported at the rear end of the swing arm 116, and the rear wheel 118 is rotationally driven via a driven sprocket 120 around which a chain 119 is wound. Further, the rear fender 115 is fixed so as to cover the upper part of the rear wheel 118.
[0017]
A V-type two-cylinder engine 121 supported by the vehicle body frame 101 is mounted at a substantially central portion of the vehicle. The engine 121 is supplied with a mixture of air and fuel, and exhaust gas after combustion in the engine 121 is exhausted from the rear of the vehicle through an exhaust pipe 122 and a muffler 123 connected thereto. A radiator 50 is disposed in front of the engine 121, as will be described in detail later.
[0018]
A fuel tank 124 is provided above the engine 121. Further, a seat 125 is continuously provided behind the fuel tank 124. The seat 125 is supported on the seat rail, and a side cover 126 is attached to the lower side of the seat 125 and a rear carrier 127 is attached to the rear of the seat 125.
[0019]
FIG. 3 shows the engine periphery of the motorcycle according to the present embodiment. As shown in the figure, a motorcycle body frame 101 is employed in the motorcycle according to the present embodiment. A head pipe 128, a truss frame 129 that extends separately from the head pipe 128 on both the left and right sides, and a truss frame 129 are shown. A body frame 130 and the like projecting substantially downward from the rear end.
[0020]
The engine 121 is supported by the truss frame 129 and the body frame 130 via a plurality of engine mounts 135. The V-type two-cylinder engine 121 employed in the motorcycle according to the present embodiment has a front cylinder 131 and a rear cylinder 132 that are shifted by about 90 degrees in the front-rear direction. The front cylinder 131 is inclined forward and disposed below the truss frame 129 and substantially parallel to the truss frame 129, and the rear cylinder 132 is inclined obliquely upward and disposed between the left and right truss frames 129.
[0021]
An air cleaner 133 is disposed between the left and right truss frames 129 so as to be sandwiched between the front cylinder 131 and the rear cylinder 132 of the engine 121. The air cleaner 133 is connected to the front cylinder 131 and the rear cylinder 132 via a throttle body 134, and an air-fuel mixture of air supplied from the air cleaner 133 and fuel injected from an injector attached to each throttle body 134 is obtained. Supplied to the engine 121. Note that the fuel tank 124 shown in FIG. 1 is mounted so as to cover the air cleaner 133 from above, from the side, and from the rear.
[0022]
A radiator 50 is disposed in front of the engine 121 so as to span the head pipe 128 side of the truss frame 129 and the front cylinder 131 of the engine 121.
[0023]
FIG. 4 is a view taken in the direction of the arrow IV in FIG. Brackets 51 and 52 are fixed to the upper surface of the radiator 50 so as to protrude upward at the left and right positions. The right (left in the drawing) bracket 52 is inserted into the right truss frame 129 and supported rotatably, and the left ( The bracket 51 (right side of the drawing) is fastened to the left truss frame 129 via bolts 53 and the like. As will be described later, since the reservoir tank 58 is fixed to the radiator 50, it is desirable to interpose a cushion member between the bracket 51 and the truss frame 129.
[0024]
Further, the bracket 54 is fixed to the lower surface of the radiator 50 so as to protrude downward at the left position (the right in the drawing), and the bracket 54 is fastened to the cylinder head cover 131a of the front cylinder 131 of the engine 121 via a bolt 55 or the like. The
[0025]
A cooling fan (not shown) is attached to the back side of the radiator 50, and an inlet side tank 56 and an outlet side tank 57 are provided on both sides. In each figure, although the connection relationship of the radiator 50 is omitted, the inlet side tank 56 is connected to a thermostat connected to a water jacket of the engine 121 via a radiator inlet hose. The outlet side tank 57 is connected to a water pump on the engine 121 side via a radiator outlet hose. That is, the cooling water of the engine 121 circulates from the water jacket back to the water jacket of the engine 121 via the thermostat, the radiator inlet hose, the radiator 50, the radiator outlet hose, and the water pump. A radiator cap 59 is provided at the upper end of the outlet side tank 57.
[0026]
A reservoir tank 58 is fixed to the right side of the radiator 50 so as to protrude forward. As shown in FIG. 3, the reservoir tank 58 protrudes in a substantially vertical direction with respect to the front surface of the radiator 50 and extends upward from the middle, and the front surface 58a of the reservoir tank 58 has a curved shape. The A cylindrical water supply unit 61 is provided on the upper surface of the reservoir tank 58.
[0027]
As shown in FIG. 7, the reservoir tank 58 thus configured is fixed to the side surface of the outlet side tank 57 of the radiator 50 via a support plate 60, and a radiator cap 59 of the radiator 50 via an overflow hose (not shown). Connected to the side. If the reservoir tank 58 is made of a transparent or translucent synthetic resin, the remaining amount of cooling water can be confirmed.
[0028]
FIG. 5 shows a configuration example of the cowling 1. The cowling 1 is made of resin. The cowling body 2, the left and right cowling sides 3 </ b> L and 3 </ b> R disposed below the both sides of the cowling body 2, and the front lower portion of the cowling body 2 are sandwiched between the left and right cowling sides 3 </ b> L and 3 </ b> R. It is comprised by the cowling inner 4 etc. which are arrange | positioned.
[0029]
The cowling body 2 covers the head pipe 128, the meter unit, and the like (see FIG. 1), and is formed with a screen attachment portion 5 for attaching the screen 112, a hole 6 for exposing the headlight 113, and the like.
[0030]
The left and right cowling sides 3L and 3R form the outer wall of the cowling 1 and cover the upper portion of the front fork 102, the front side portion of the fuel tank 124, the upper side portion of the radiator 50, and the like (see FIG. 1). It is fixed to the side part of the cowling body 2 via a screw 7 or the like. The cowling sides 3L and 3R are formed with bosses 24 in which through holes for connecting to the side surfaces of the tanks 56 and 57 of the radiator 50 via screws or the like are formed.
[0031]
The cowling inner 4 includes a cowling body under part 8 that constitutes an under part of the cowling body 2, and air guide plate parts 9 </ b> L and 9 </ b> R that hang down from both ends of the cowling body under part 8. The cowling body under part 8 is fixed to the cowling body 2 and the cowling sides 3L and 3R via the screws 10 and 11 along the lower front part of the cowling body 2. The left and right air guide plate portions 9L and 9R are fixed to the bosses 12 protruding from the inner surfaces of the cowling sides 3L and 3R via screws 13 or the like. The front end portions 14 of the air guide plate portions 9L and 9R are located along the front end portions 15 of the cowling sides 3L and 3R, and constitute an inner wall from the front portion to the inside of the cowling sides 3L and 3R (see FIG. 8). ).
[0032]
Here, the rear end of the air guide plate portion 9L of the cowling inner 4 is substantially linear (rear end portion 16), whereas the rear end of the air guide plate portion 9R is substantially linear only below. (Rear end portion 17), and a notch 18 is formed above the rear end portion 17. As will be described later, the notch 18 is formed in accordance with the curved shape of the front surface 58a of the reservoir tank 58 so as not to interfere with the reservoir tank 58 of the radiator 50.
[0033]
When the cowling 1 is attached to the front of the vehicle body, the cowling sides 3L and 3R are positioned on both sides of the radiator 50 and the cooling air intake is opened in front of the radiator 50 as shown in FIG. It becomes. The wind guide plates 9L and 9R of the cowling inner 4 extend from the front end of the opening to the vicinity of the front surface of the radiator 50 on the left and right sides of the cooling air intake, and travel air (cooling air) is supplied to the core 50a of the radiator 50. ) Will be guided. Therefore, the traveling wind is introduced into the radiator 50, and at this time, the traveling wind can be efficiently introduced into the core portion 50a of the radiator 50 by the wind guide plates 9L and 9R of the cowling inner 4.
[0034]
Next, with reference to FIGS. 6 and 7, the positional relationship between the cowling 1 (the cowling inner 4) and the radiator 50 will be described. As described above, the radiator 50 is supported by the truss frame 129 via the brackets 51 and 52, and by the cylinder head cover 131 a of the front cylinder 131 of the engine 121 via the bracket 54.
[0035]
Then, with the cowling 1 covering the front of the vehicle body, the rear end portion 16 of the wind guide plate portion 9L of the cowling inner 4 is positioned on the left side (inlet side tank 56) in front of the radiator 50, as shown in FIG. To do.
[0036]
Further, as shown in FIG. 7, the lower portion of the rear end (rear end portion 17) of the air guide plate portion 9 </ b> R is located on the right side (the outlet side tank 57) in front of the radiator 50, and along the notch portion 18. A front surface 58a of the reservoir tank 58 is disposed.
[0037]
That is, the reservoir tank 58 and the air guide plate portion 9R are located on the same plane. As described above, the air guide plate portions 9L and 9R serve to introduce the traveling wind into the radiator 50. However, if the cutout portion 18 that is cut out in a curved shape is formed in the air guide plate 9R, the air guide plate is formed. The function as a part deteriorates. However, by arranging the reservoir tank 58 along the notch portion 18 as described above, the side surfaces of the wind guide plate portion 9R and the reservoir tank 58 serve as a wind guide plate portion, The function is not hindered. Further, if the inner side surface of the air guide plate portion 9R and the inner side surface of the reservoir tank 58 are flush with each other, the traveling wind can be introduced to the radiator 50 more efficiently.
[0038]
Here, as shown in FIG. 8, the rear end portion 16 of the wind guide plate portion 9L of the cowling inner 4 is formed with an inclined portion 19 that is inclined toward the outer side of the radiator 50 (the cowling side 3L side). . Similarly, the rear end portion 17 (excluding the notch portion 18) of the wind guide plate portion 9R of the cowling inner 4 is also inclined portion 19 (not shown) inclined toward the outer side of the radiator 50 (the cowling side 3R side). Is formed. These inclined portions 19 have their end portions positioned on the outer side of the side ends of the radiator 50 (side ends of the tanks 56 and 57) so as to escape from the moving locus of the radiator 50.
[0039]
Next, the operation of the motorcycle according to the present embodiment will be described with reference to FIGS. In maintenance of the front cylinder 131 of the engine 121 (for example, inspection and replacement of the spark plug), first, as shown in FIG. 8, the screws 20 that connect the cowling sides 3L and 3R and the side surfaces of the tanks 56 and 57 of the radiator 50. Is removed from the boss 24.
[0040]
Then, as shown in FIG. 9, the bolt 55 on the lower side of the radiator 50 is removed. As a result, the radiator 50 can be rotated in the front-rear direction of the vehicle body. Therefore, as indicated by an arrow R in the figure, the lower portion of the radiator 50 is moved forward so that the radiator 50 is pivoted about the upper support position. And rotate.
[0041]
At this time, as shown in FIG. 8, the tanks 56 and 57 on both sides of the radiator 50 abut against the inclined portions 19 formed on the air guide plates 9L and 9R of the cowling inner 4. Then, as the radiator 50 is rotated, the radiator 50 presses the inclined portion 19 so that the resin cowling 1 (the cowling sides 3L, 3R, the air guide plate portions 9L, 9R of the cowling inner 4) is laterally (in the drawing). Push in the direction of arrow X). In FIG. 8, the radiator 50 is illustrated as moving, but in actuality, the cowling 1 (the cowling sides 3L and 3R, the wind guide plates 9L and 9R of the cowling inner 4) is elastically deformed.
[0042]
In this case, if the inclined portion 19 is not formed on the air guide plate portions 9L and 9R of the cowling inner 4 as described in the conventional example (see the broken line in FIG. 8), the radiator hits the air guide plate portion. On the other hand, by forming the inclined portion 19 in the air guide plate portions 9L and 9R of the cowling inner 4 as described above, the cowling 1 is naturally pushed to the side simply by moving the radiator 50. Workability can be greatly improved.
[0043]
The cowling 1 may be made of any material that can be elastically deformed. For example, by using a soft polyethylene-based resin, the cowling 1 can be easily elastically deformed, and the risk of cracks and the like is reduced.
[0044]
The reservoir tank 58 fixed to the radiator 50 also moves with the rotation of the radiator 50. The curved front surface 58a of the reservoir tank 58 is formed in the notch 18 formed in the air guide plate portion 9R of the cowling inner 4. Accordingly, the reservoir tank 58 does not interfere with the cowling 1. Therefore, it is not necessary to remove the reserve tank 58, and workability can be greatly improved.
[0045]
The curved shape of the notch portion 18 of the air guide plate portion 9R and the front surface 58a of the reservoir tank 58 may be any shape as long as the reservoir tank 58 does not interfere with the cowling 1, but the radiator Ideally, it should be a substantially concentric arc portion centered on 50 rotation axes. In this case, the gap between the notch portion 18 of the air guide plate portion 9R and the front surface 58a of the reservoir tank 58 is kept substantially constant, so that it is not necessary to secure a gap corresponding to the movement trajectory of the reservoir tank 58. Therefore, in the normal state shown in FIG. 7 and the like, the gap between the air guide plate portion 9R and the reservoir tank 58 can be narrowed, and the air guide plate that the side surfaces of the air guide plate portion 9R and the reservoir tank 58 play together. The function as a part can be improved. It is also possible to secure a large capacity of the reservoir tank 58.
[0046]
If the radiator 50 is moved until it exceeds the inclined portion 19 as described above, a sufficient gap can be secured between the radiator 50 and the front cylinder 131 of the engine 121, so a tool such as a plug wrench can be used. Can be inserted. Therefore, the maintenance work of the front cylinder 131 can be easily performed without removing the radiator 50 and the like.
[0047]
(Other embodiments)
As shown in FIG. 10, a stopper 21 may be provided on the air guide plates 9L and 9R of the cowling inner 4 so that the radiator 50 can be held in a state of being rotated forward. The stopper 21 shown in FIG. 10 has an inclined surface 22 that is continuous with the inclined portion 19 of the air guide plate portions 9L and 9R, and a stopper surface 23 that is formed on the back side of the inclined surface 22, that is, in front. The stopper 21 may be formed integrally with the air guide plate portions 9L and 9R, or a separate member may be attached.
[0048]
If the stopper 21 is provided in this way, when the radiator 50 is rotated, the radiator 50 moves over the inclined surface 22 of the stopper 21 and moves to the stopper surface 23 side. In this state, since the movement of the radiator 50 toward the inclined portion 19 is restricted by the stopper surface 23 of the stopper 21, it is possible to prevent the radiator 50 from being pushed back by the elastically deformed cowling. Therefore, the radiator 50 can be held in a state of being rotated forward, and workability can be improved.
[0049]
The stopper 21 constitutes the stopper structure referred to in the present invention, but any stopper structure may be used. For example, a configuration in which a convex portion is provided on one of the side surface of the radiator 50 and the air guide plate portions 9L and 9R, a concave portion is provided on the other, and the concave and convex portions are engaged so that the stopper function is exhibited. It is good.
[0050]
As mentioned above, although this invention was demonstrated with various embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention. For example, in the above-described embodiment, the V-type two-cylinder engine 121 has been described as an example. However, the present invention is not limited thereto, and may be applied to an L-type engine, for example.
[0051]
【The invention's effect】
As described above, according to the present invention, when rotating the radiator during maintenance work, the cowling is removed from the vehicle body, or the operator pushes the cowling laterally while the operator spreads the radiator to the left and right sides. In addition, even when the reservoir tank is fixed to the radiator, it is not necessary to remove the reservoir tank, and the workability can be greatly improved.
[Brief description of the drawings]
FIG. 1 is a side view showing an overall configuration of a motorcycle according to an embodiment.
FIG. 2 is a front view showing an overall configuration of the motorcycle according to the embodiment.
Fig. 3 is a side view showing the periphery of the engine of the motorcycle according to the embodiment.
4 is a view in the direction of arrows IV in FIG. 3;
FIG. 5 is a diagram illustrating a configuration example of a cowling 1;
FIG. 6 is a left side view showing a positional relationship between the cowling 1 (the cowling inner 4) and the radiator 50.
FIG. 7 is a right side view showing a positional relationship between the cowling 1 (the cowling inner 4) and the radiator 50.
8 is a cross-sectional view taken along the line VIII-VIII of FIG. 1 showing the positional relationship between the cowling 1 (cow ring inner 4) and the radiator 50. FIG.
FIG. 9 is a left side view showing the positional relationship between the cowling 1 (the cowling inner 4) and the radiator 50 when the radiator 50 is rotated.
FIG. 10 is a diagram for explaining an example in which a stopper 21 is provided.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cowling 2 Cowling body 3L, 3R Cowling side 4 Cowling inner 9L, 9R Air guide plate part 18 Notch part 21 Stopper 50 Radiator 51, 52 Bracket 54 Bracket 58 Reservoir tank 58a Front surface 101 Body frame 121 Engine 128 Head pipe 129 Truss frame 130 Body frame 131 Front cylinder 132 Rear cylinder

Claims (2)

An engine having a cylinder supported by a body frame and arranged to be inclined forward;
A radiator disposed in front of the engine;
A cowling made of an elastically deformable material covering the front of the vehicle body including the engine and the radiator;
The upper part of the radiator is supported so as to be rotatable in the front-rear direction of the vehicle body, and the lower part is a vehicle body front part structure configured to be removably supported,
The cowling has a cooling air intake opening to the radiator in front of the radiator, and extends from the opening front end to the vicinity of the front surface of the radiator on the left and right sides of the cooling air intake opening to the radiator core. An air guide plate portion that guides cooling air is provided, and an inclined portion that inclines toward the outside in the left-right direction of the radiator is formed at the rear end of the air guide plate portion, and the air guide plate is rotated with the rotation of the radiator. The inclined part of the part is pressed and spread in the left-right direction,
A body front structure of a motorcycle, wherein a stopper structure is provided on the wind guide plate portion of the cowling to hold the radiator in a state of being rotated forward. An engine having a cylinder supported by a body frame and arranged to be inclined forward;
A radiator disposed in front of the engine;
A cowling made of an elastically deformable material covering the front of the vehicle body including the engine and the radiator;
The upper part of the radiator is supported so as to be rotatable in the front-rear direction of the vehicle body, and the lower part is a vehicle body front part structure configured to be removably supported,
A reservoir tank is fixed so as to protrude forward in one side of the radiator in the left-right direction, and a cowling side forming an outer wall of the cowling, and both left and right sides of a cooling air intake opening to the radiator opening in front of the radiator It is disposed between the front end of the opening and the vicinity of the front surface of the radiator so as to guide the cooling air to the core portion of the radiator, and the outer shape of the reservoir tank is arranged on the upper rotating shaft of the radiator. And is formed in the shape of a curve of a substantially concentric arc,
The air guide plate portion is provided with a notch portion that is substantially concentric with the outer shape of the reservoir tank, and the side surface of the reservoir tank is formed flush with the side surface of the air guide plate portion so as to face the cooling intake port. The front structure of the motorcycle body characterized by that.

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