JPH017673Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to an under guard for small vehicles, particularly straddle-type four-wheeled vehicles.

Since straddle-type four-wheel vehicles often drive on rough terrain,
There is a high risk of damage to the frame, steering system, engine case, etc. when driving over obstacles on rough terrain. Therefore, it is necessary to provide an under guard on the lower side. However, providing the under guard brings about a problem of a reduction in heat dissipation efficiency of the engine section. The underguard according to the present invention can be used as an underguard with good heat dissipation efficiency for small vehicles (particularly straddle-type four-wheeled vehicles) while preventing damage to the frame, steering system, and engine case.

b. Prior Art FIG. 1 is a perspective view of a frame portion of a straddle-type four-wheel vehicle equipped with a front under guard according to the prior art.

In straddle-type four-wheeled vehicles that frequently travel on rough terrain, a heavy load is placed on the engine even at low speeds, resulting in high temperatures in the vicinity of the engine. Therefore, the front under guard 1 of the straddle type four-wheel vehicle shown in Fig. 1 is
Since it is necessary to prevent overheating near the engine, it is attached only to the lower part of the front wheel axle 2.

On the other hand, straddle-type four-wheeled vehicles are often equipped with low-pressure tires, so they have a considerable degree of freedom in vertical movement when traveling on rough terrain. Because of this, or due to the driver's inattention, the front axle 2
can be overcome. At this time, because conventional straddle-type four-wheel vehicles do not have an under guard attached to the bottom of the engine for the reasons mentioned above, the frame, steering system, engine case, etc. or any of these may be damaged. There was a possibility of damage.

In addition, the engine lower guard to prevent the motorcycle engine from coming into contact with obstacles was developed by JP-A-Sho.
It is disclosed in the publication No. 56-163982. This engine lower guard covers the leading edge and underside of the engine.
protect the engine. In an engine lower guard having such a structure, the engine lower guard at the leading edge of the engine may violently collide with an obstacle, and even if the engine is not damaged, the vehicle body may lose its balance.

c. Problems that the invention aims to solve This invention protects the steering system and the underside of the engine of a vehicle whose front wheels consist of a right front wheel and a left front wheel, and even if the front wheels go over an obstacle, a severe impact is applied to the vicinity of the underside of the engine. It is an object of the present invention to provide an under guard for a small vehicle, which has a structure that does not cause problems and has an air guide path for sending cooling air to an engine.

d Means for solving the problem The above problem consists of a front wheel consisting of a right front wheel and a left front wheel,
In the under guard of a small vehicle where the steering system and engine are located approximately along the center line of the vehicle body, the front edge covering the front edge of the vehicle's lower frame and the lower side of the portion from the front end of the lower frame to the bottom of the engine are covered. The substantially planar lower surface portion to be covered is an integrally formed rigid flat plate, and is characterized by having an air guide path for sending air for cooling the engine from the lower side of the rigid flat plate to the engine part. The problem was solved by using underguards for small vehicles.

e Function The front edge and lower surface of the underguard are integrally formed, and the lower surface is approximately flat, so when the front edge overcomes an obstacle due to inertia, the lower surface of the underguard will move over the obstacle. slip on things. Therefore,
Impacts to the leading edge of the engine are prevented.

The under guard has an air guide path, so even though it covers a wide area below the engine,
Engine overheating is prevented.

f Embodiment FIG. 2 is a side view of a frame portion of a straddle-type four-wheel vehicle equipped with an under guard according to the present invention.

The under guard 3 according to the present invention includes a lower frame 4 as conceptually illustrated in FIG.
A bumper 5 attached to the front upper part of the front end 4a of the
It is a rigid flat plate that covers the lower frame 4 in the section from the lower surface to the lower surface of the engine section 6 via the lower surface of the front end 4a of the lower frame. The under guard 3 according to the present invention is installed up to the bottom surface of the engine, and since the under guard 3 has the air guide path shown in FIGS. 3 to 5,
Air is drawn from the bottom of the vehicle while driving.

FIG. 3 is a cross-sectional elevational view of a preferred embodiment of the underguard according to the present invention.

The under guard 3a shown in FIG. 3 is an example of an under guard that is a rigid flat plate whose front edge is curved upward, and has an air circulation hole 7a formed therein. In order to improve the efficiency of air guiding to the engine, the under guard 3a is arranged at intermediate portions of the adjacent flow holes 7a of the rigid flat plate so as to approach the vehicle body in a direction opposite to the traveling direction of the vehicle (arrow 9a). The air guide plate 8a is formed by tilting the air guide plate 8a. As a result, air is introduced as shown by arrow 10a.

4A and 4B are a perspective view and an elevation sectional view of another embodiment of the present invention.

This underguard includes an air circulation hole 7b on which an air guide plate 8b is provided. As shown in FIG. 4B, the air guide plate 8b is inclined toward the lower surface of the engine in a direction opposite to the traveling direction of the vehicle body (arrow 9), and is disposed on the upper surface side of the rigid flat plate. It is set up. Therefore, as the vehicle moves forward (arrow 9b), air is directed toward the engine (arrow 1) due to hydrodynamic effects.
0) Be guided.

The under guard 3b in FIG.
Since the air guide plate 8b is provided above the air guide plate 8b, there is an advantage that the engine section directly above the air circulation hole 7b is protected from damage.

FIG. 5 is a perspective view of still another embodiment of the under guard according to the present invention.

The under guard shown in FIG. 5 has an air guide path 7c with an air guide plate 8c curved upward at the end opposite to the direction of vehicle movement (arrow 9c). In this case too, air is drawn in in the direction of arrow 10c by hydrodynamic effects.

The underguards shown in FIGS. 3 to 5 are appropriately selected depending on the spatial arrangement and spatial margin of the lower part of the vehicle body.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the frame of a straddle-type four-wheel vehicle according to the prior art, FIG. 2 is a perspective view of the frame of a straddle-type four-wheel vehicle equipped with an under guard according to the present invention, and FIG. 3 is a perspective view of the frame of a straddle-type four-wheel vehicle according to the present invention. FIGS. 4A and 4B are a perspective view and an elevational sectional view of another embodiment of the invention, and FIG. 5 is an elevational sectional view of an embodiment of the underguard according to the invention. FIG. 7 is a perspective view of another embodiment. 2... Front wheel axle, 3, 3a, 3b, 3c... Under guard, 4... Lower frame, 5... Bumper, 6... Engine part, 7a, 7b, 7c...
...Air guide path, 8a, 8b, 8c...Air guide plate, 9
a, 9b, 9c...vehicle traveling direction, 10a, 10
b, 10c...Air introduction path.

Claims (1)

[Scope of utility model registration request] In the under guard of a small vehicle, the front wheels consist of a right front wheel and a left front wheel, and the steering system and engine are arranged approximately along the center line of the vehicle body.
It is a rigid flat plate that is integrally formed with a front part that covers the front edge of the lower frame of the vehicle and a substantially planar lower surface that covers the lower surface of the part from the front end of the lower frame to the bottom of the engine, and is used to cool the engine. An under guard for a small vehicle, comprising an air guide path for sending air from the lower side of the rigid flat plate to an engine section.