JP2000247279A - Cowling mounting structure for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain excellent appearance and ventilating performance on a heat exchanger by preventing dislocation between the heat exchanger and a ventilating opening formed at a cowling, suppress the generation of vibrating sound by improving vibration isolating performance, and improve maintainability around the heat exchanger. SOLUTION: A cowling fixing parts 72, 72, 73 are provided around a heat exchanger (an oil cooler 30, for instance), whereas fastening parts 52, 52, 53 are provided around a ventilating opening 51 of a cowling 36 (an under cowl 39), and the fastening parts 52, 52, 53 are screw-fastened to the cowling fixing parts 72, 72, 73. The under cowl 39 with the ventilating opening 51 formed is formed as a separate body from the other part (a lower cowl) of the cowling 36 and detachably fixed, and the heat exchanger 30 is floatingly mounted to a motorcycle body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle mounting structure for a motorcycle.

[0002]

2. Description of the Related Art In a motorcycle in which an engine is mounted in the first half of a vehicle body frame, heat exchangers such as a radiator and an oil cooler are provided in front of the engine. It is cooled by the blowing wind. In a vehicle model in which the front half of the body frame is covered with a streamlined cowling together with the engine and the heat exchanger, a ventilation opening is formed near the lower portion of the cowling to match the position of the heat exchanger in a front view. The wind is allowed to hit the heat exchanger without being blocked by the cowling.

[0003] In recent years, the body frame of a motorcycle has mainly been a twin pipe type in which a pair of left and right thick main pipes extend obliquely downward and rearward from a head pipe on which a front fork is pivotally supported. The twin-pipe type body frame is also called a diamond type, and the structure itself is simplified and lightened by utilizing the engine itself suspended on the body frame as a strength member.

[0004]

However, in such a twin-pipe type body frame, there is no portion for fixing the vicinity of the lower part of the cowling, so that the position accuracy of the ventilation opening formed near the lower part of the cowling is small. Tend to be low. In other words, there is a concern that the ventilation opening tends to be displaced with respect to the heat exchanger, so that the ventilation to the heat exchanger is deteriorated and the appearance is deteriorated.

In addition, since the support rigidity near the lower portion of the cowling is low, the cowling easily resonates with engine vibration and the like.
There is also a problem that vibration noise is generated. For example, it is conceivable to extend the stay member from the engine and support the vicinity of the lower part of the cowling at the tip to increase the position accuracy of the ventilation opening and prevent the cowling from resonating. can not deny.

On the other hand, when performing maintenance around the heat exchanger, it is necessary to remove the entire cowling, but since a large cowling is very difficult to remove, it is difficult to maintain around the heat exchanger. There is also.

A motorcycle cowling mounting structure according to the present invention has been invented to solve the above-mentioned problems, and an object of the present invention is to reduce the displacement between a ventilation opening formed in a cowling and a heat exchanger. Prevent and maintain good ventilation and appearance to the heat exchanger, and also improve the vibration isolation of the cowling to suppress the generation of vibration noise, etc., and also to improve the maintainability around the heat exchanger. It is in.

[0008]

In order to achieve the above object, a motorcycle cowling mounting structure according to the present invention comprises:
As described in claim 1, an engine is mounted on the front half of the body frame, a heat exchanger is provided in front of the engine, and the front half of the body frame is covered with the cowling together with the engine and the heat exchanger, In the motorcycle in which the cowling has a ventilation opening that is aligned with the position of the heat exchanger in a front view, a cowling fixing portion is provided around the heat exchanger, while the cowling is provided around the ventilation opening of the cowling. A fastening portion was provided, and the fastening portion was screw-fastened to the cowling fixing portion.

According to the above construction, the fastening portion provided around the ventilation opening of the cowling is screw-fastened to the cowling fixing portion provided around the heat exchanger, so that the ventilation opening and the heat exchanger are connected. Are integrated to prevent displacement, so that good ventilation and appearance to the heat exchanger can be maintained. Further, since the cowling is supported by the heat exchanger, the support rigidity of the cowling is increased, and the generation of vibration noise due to the cowling resonating with engine vibration or the like is suppressed. In addition, since the heat exchanger itself functions as a stay member for fixing the cowling, there is no need to newly add a stay member, and there is no increase in the number of parts.

Also, in order to achieve the above object, a motorcycle cowling mounting structure according to the present invention has the heat exchanger floatingly mounted on a motorcycle body as described in claim 2. . In this case, the cowling is also attached to the vehicle body in a floating manner, so that the resonance of the cowling and the generation of vibration noise are more effectively suppressed.

Further, in order to achieve the above object,
In the motorcycle cowling mounting structure according to the present invention, as described in claim 3, a portion of the cowling where the ventilation opening is formed is formed separately from other portions, and the ventilation opening is The part to be formed was detachably fixed to the other part. By doing so, it is possible to easily perform maintenance around the heat exchanger by removing only the portion where the ventilation opening is formed without removing the entire cowling.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a left side view showing an example of a motorcycle to which one embodiment of the present invention is applied.

The body frame 2 of the motorcycle 1 is of a twin pipe type in which a pair of left and right thick main pipes extend obliquely downward and rearward from a head pipe 2a located at the front of the head. A front fork 3 is pivotally supported by the head pipe 2a, and a front wheel 4 is supported at its lower end. On the other hand, a swing arm 7 supporting a rear wheel 6 is pivotally supported on a pivot shaft 5 erected at the lower center of the body frame 2.

An engine 8 is provided in the lower front half of the body frame 2.
The engine 8 itself is also a strength member of the body frame 2. A fuel tank 9 is installed above the engine 8, and a seat 10 and a pillion seat 11 are placed behind the fuel tank 9.

FIG. 2 and FIG. 3 are a left side view and a front view around the engine 8, respectively. The engine 8 is, for example, a water-cooled parallel four-cylinder DOHC engine, and a cylinder block 14, a cylinder head 15, and a head cover 16 are installed on the front upper surface of a crankcase 13 with a forward inclination.

As shown in FIG. 1, a fuel injection device 19 and an air cleaner 20 are connected to a rear portion of the cylinder head 15, and an upper portion of the fuel injection device 19 and the air cleaner 20 are provided inside the fuel tank 9. Not fit into the recess. As shown in FIG. 3, four exhaust ports 21 are continuously provided in the vehicle width direction on the front surface of the cylinder head 15, and four exhaust pipes 22 are connected thereto. These exhaust pipes 22 hang down from the exhaust port 21 and curve rearward, and are connected to an exhaust muffler 25 via a collecting pipe 23 and a muffler pipe 24.

Further, a radiator 27 for exchanging heat with the cooling water is provided in front of the engine 8, and an electric fan 28 is provided on a rear surface thereof. The radiator 27 is cooled by the traveling wind blown from the front when the motorcycle 1 travels. However, when cooling by the traveling wind is not expected, such as when the motorcycle 1 is stopped, the electric fan 28 operates to activate the radiator.
Additional cooling of 27.

Further, below the radiator 27, an oil cooler 30, which is also cooled by traveling wind, is provided. This oil cooler 30 is, for example, a radiator
27 A pair of left and right fixed brackets 31, 31 provided on the lower edge
(See FIG. 3) and attached to a stay 33 (see FIG. 2) extending forward from the crankcase 13. The oil cooler 30 is a member corresponding to the heat exchanger described in claim 1.

The front half of the body frame 2 is covered with a streamlined cowling 36 together with the engine 8, the radiator 27, the oil cooler 30, and the like, so that the air resistance during traveling and the appearance are improved. This cowling 36
As shown in FIG. 4, for example, a lower cowl 38 is connected to a lower portion of an upper cowl 37, and a separate under cowl 39 is fixed to a lower front portion of the lower cowl 38 as shown in FIGS. is there. The upper cowl 37
At the top is a transparent windscreen 40 and headlamp
41 are provided.

Upper and lower fastening seats 42 and 43 are formed on the side surface of the lower cowl 38, and this portion is screwed to a structure such as the body frame 2 and the engine 8. Also, three fastening pieces 44, 4 on one side formed on the upper part of the lower cowl 38.
The lower edge of the upper cowl 37 is screwed to 5, 46. The upper cowl 37 is fixed to the front head of the body frame 2 via a cowling brace (not shown).

As shown in FIG. 6, the lower cowl 38 is formed with a substantially U (V) -shaped indented portion 48 which is indented downward when viewed from the front, and an under cowl is formed so as to cover the lowermost portion of the indented portion 48.
39 is detachably fixed. As shown in FIG. 7, the under cowl 39 is provided with two fastening pieces 49 and 50 on one side,
These fastening pieces 49, 50 are screwed to the inner surface of the lower cowl 38. The upper edge of the under cowl 39 is connected to the lower edge of the radiator 27 without any gap.

The under cowl 39 has a substantially rectangular and horizontally long ventilation opening 51. This ventilation opening 51
Is formed so as to match the position of the oil cooler 30 in a front view as shown in FIG. Around the ventilation opening 51, for example, a pair of left and right fastening portions 52 is formed on the upper side, and one fastening portion 53 is formed on the lower side at the center. These fastening portions 52, 52, 53 are formed in a boss shape extending rearward as shown in the cross section in FIG. 8, and screw holes 54, 54, 55 are formed.

On the other hand, around the oil cooler 30, FIG.
As shown in FIGS. 9 and 10, a pair of left and right fixing brackets 57 are provided on the upper side, and one fixing bracket 58 is provided on the lower side. Upper fixed bracket 57, 57
Is, for example, a sheet metal material bent in a substantially L-shape, and the horizontal surface thereof is fixed to the upper surface of the oil cooler 30. A holding hole 60 is formed on the vertical surface on the outside in the vehicle width direction, and the fixing hole is formed on the inside. 61
Are drilled. The lower fixing bracket 58 is also formed by bending a sheet metal material, the horizontal surface is fixed to the lower surface of the oil cooler 30, the holding hole 62 is formed on the vertical surface, and the fixing hole 63 is formed on the front surface. Have been.

As shown in FIG. 8, the upper fixing bracket
An elastic bush 65 made of an elastic material such as rubber is fitted into the holding hole 60 of the 57, and a metal spacer washer 66 is inserted into the center of the elastic bush 65 from the front. A screw 67 inserted from the front is fastened to a nut 68 on the rear surface of the fixed bracket 31, 31 at the lower edge of the radiator 27.

Similarly, the holding hole of the lower fixing bracket 58
An elastic bush (not shown) and a spacer washer are also fitted to 62, and this portion is screwed to a nut 69 (see FIG. 2) provided at the front end of the stay 33 extending forward from the crankcase 13. As described above, the three fixing brackets 57, 57, 58 of the oil cooler 30 are floatingly attached to the fixing brackets 31, 31 and the stay 33 of the radiator 27 via the elastic bushes 65, respectively.

Also, clip nuts are respectively provided in the fixing holes 61, 61, 63 of the three fixing brackets 57, 57, 58.
The cowling fixing portions 72, 72, and 73 are attached thereto.
These cowling fixing portions 72, 72, 73 are respectively connected to the respective fastening portions formed around the ventilation opening 51 of the under cowl 39.
52, 52, 53 aligned to the back. And each fastening part 52,5
Screws 74 inserted from the front into the screw holes 54, 54, 55 of the 2, 53 are fastened to the clip nuts 71 of the cowling fixing portions 72, 72, 73, thereby fixing the under cowl 39 to the oil cooler 30. .

As described above, since the fastening portions 52, 52, 53 provided around the ventilation opening 51 of the under cowl 39 are fastened to the cowling fixing portions 72, 72, 73 of the oil cooler 30 by the screw 74, the ventilation The opening 51 and the oil cooler 30 are integrated to prevent displacement. The shape of the under cowl 39 is formed so that the traveling wind blown from the front when the motorcycle 1 travels is collected and guided to the oil cooler 30 from the ventilation opening 51, but the displacement between the ventilation opening 51 and the oil cooler 30 is displaced. Since there is no air flow, good ventilation to the oil cooler 30 is maintained. In addition, there is no deterioration in appearance due to the displacement of the ventilation opening 51.

Further, since the oil cooler 30 firmly supports the under cowl 39 and the lower cowl 38, the rigidity of support particularly at the lower portion of the cowling 36 is increased, and the generation of vibration noise due to the cowling 36 resonating with engine vibration or the like is performed. Effectively suppressed. The oil cooler 30
Since it itself functions as a stay member to fix the under cowl 39, there is no need to add a new stay member,
The number of parts cannot be increased.

In addition, the oil cooler 30 is an elastic bush.
Since the under cowl 39 and the lower cowl 38 fixed to the oil cooler 30 are also attached to the vehicle body in a floating manner because of the elasticity of 65, the under cowl 39 and the lower cowl 38 are attached to the body of the motorcycle 1 in a floating manner. Generation of sound and the like can be more effectively suppressed.

The under cowl 39 fixed to the oil cooler 30 is formed separately from the lower cowl 38, and the under cowl 39 is detachably fixed to the lower cowl 38. In this case, only the under cowl 39 needs to be removed, and there is no need to remove the large lower cowl 38. Therefore, maintenance and the like around the oil cooler 30 can be greatly improved.

In this embodiment, the under cowl 39
The ventilation opening 51 is screwed to the oil cooler 30. For example, a ventilation opening is provided in another portion of the cowling 36 (the lower cowl 38 and the like), and a fastening portion formed around the ventilation opening 51 is connected to another heat exchanger ( A screw may be fastened to a cowling fixing portion formed around the radiator 27). Also in this case, it is desirable that the heat exchanger is mounted on the vehicle body in a floating manner.

[0032]

As described above, the motorcycle cowling mounting structure according to the present invention provides the cowling fixing portion around the heat exchanger and the fastening portion around the ventilation opening of the cowling. The fastening part is screw-fastened to the cowling fixing part, preventing displacement of the ventilation opening and the heat exchanger, maintaining good ventilation and appearance of the heat exchanger, and damping the cowling. The generation of vibration noise can be suppressed by improving the performance.

In the motorcycle cowling mounting structure according to the present invention, since the heat exchanger is mounted on the motorcycle body in a floating manner, the cowling is also fixed on the vehicle body in a floating manner. The generation of the resonance of the cowling and the vibration noise can be more effectively suppressed.

Further, in the motorcycle cowling mounting structure according to the present invention, the portion of the cowling where the ventilation opening is formed is formed separately from other portions, and the portion where the ventilation opening is formed. Is detachably fixed to the above other parts, so that only the portion where the ventilation opening is formed is removed without removing the entire cowling, so that maintenance around the heat exchanger can be easily performed, and Maintenance and the like can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a left side view showing an example of a motorcycle to which an embodiment of the present invention has been applied.

FIG. 2 is a left side view around an engine.

FIG. 3 is a front view around an engine.

FIG. 4 is a left side view showing the entire cowling.

FIG. 5 is a left side view of the lower cowl and the under cowl.

FIG. 6 is a front view of a lower cowl and an under cowl.

FIG. 7 is a front view of an oil cooler and an under cowl showing one embodiment of the present invention.

FIG. 8 is a transverse sectional view taken along the line VIII-VIII in FIG. 7;

FIG. 9 is a front view of an oil cooler.

FIG. 10 is a left side view of the oil cooler.

[Description of Signs] 1 Motorcycle 2 Body frame 8 Engine 30 Oil cooler equivalent to heat exchanger 36 Cowling 38 Lower cowl 39 Under cowl where ventilation opening is formed 51 Ventilation openings 52, 53 Fastening part 72, 73 Cowling fixing part 74 Screw

Claims (3)

[Claims] An engine is mounted on a front half of a body frame, a heat exchanger is provided in front of the engine, and a front half of the body frame is covered with a cowling together with the engine and the heat exchanger. In a motorcycle having a ventilation opening aligned with the position of the heat exchanger in a front view, the cowling fixing parts 72, 72, 73 are provided around the heat exchanger (30), while the ventilation of the cowling 36 is provided. A cowling for a motorcycle, wherein fastening portions 52, 52, 53 are provided around the opening 51, and the fastening portions 52, 52, 53 are screwed to the cowling fixing portions 72, 72, 73. Mounting structure. 2. The motorcycle cowling mounting structure according to claim 1, wherein the heat exchanger (30) is floatingly mounted on a motorcycle body. 3. A portion (39) of the cowling (36) where the ventilation opening (51) is formed is formed separately from another portion (38), and a portion (39) where the ventilation opening (51) is formed. The cowling mounting structure for a motorcycle according to claim 1, wherein the other portion (38) is detachably fixed to the other portion (38).