JPH0242554Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The invention has a steering front wheel and a pair of driving rear wheels, and a power unit is disposed between the pair of driving rear wheels to drive these wheels. The present invention relates to an air intake device for a tricycle that is swingably supported on a vehicle body frame.

PRIOR ART In a rocking type automatic tricycle having a steering front wheel and a pair of driving rear wheels, when driving on an unpaved road, the dust kicked up by the rear wheels is prevented from being inhaled from the air cleaner intake port. In order to do this, a cover with an opening at the rear is provided in the gap formed above the rear fender that partitions the upper part of the rear two wheels, and an intake pipe connects the inside of this cover to the air cleaner that is integrated into the vehicle body along with the engine and transmission. There was one that communicated (see Utility Model Application Publication No. 57-61162).

In addition, in a tricycle in which the rear two wheels, a power unit disposed between the rear two wheels, and a cover member covering the upper surfaces of these wheels are integrally pivoted to the body frame so as to be able to swing freely, the air intake hole of the air cleaner in the power unit There was one in which the opening was opened inside the cover member (see Japanese Utility Model Publication No. 114790/1983).

Problem to be Solved by the Invention In the former technology mentioned above, the rear wheels and power unit are not covered by a rear fender, so the wheels dissipate dust, etc., and the air from inside the gap is released. Since the structure for introducing the air inlet below the rear fender is complicated, it is not possible to easily set the air intake port or the like to a predetermined position.

In addition, in the case of the latter, the power unit, rear wheel, and cover member are attached so that they swing together, that is, in an integral relationship, so that the rear wheel, power unit, and cover member swing together. , the gap between the three parts of the cover member can be made as small as possible to create a compact structure, and the dispersion or splashing of dust and mud can be effectively suppressed;
Since the gap between the cover member and the rear wheel is small, it is easy for sand and dust to remain and accumulate inside the cover member. Therefore, there was a problem that the air cleaner's intake hole opened in the cover sucked in the dust and the like, causing the air cleaner to become dirty at an early stage.

The present invention aims to overcome the above-mentioned difficulties and ensure a suction path of sufficient length without impairing the capacity of the air cleaner.This invention covers the atmospheric side opening of the suction duct connected to the air cleaner. It is provided at an appropriate position on the upper surface of the member and is led into the inside of the cover member from the rearmost part of the upper surface of the cover member.

Means and Effects for Solving the Problems In accordance with the above-mentioned objectives, the present invention has a front wheel for steering and two rear wheels for driving, a power unit is disposed between the two rear wheels for driving, and a power unit is provided between the two rear wheels for driving. Two rear driving wheels, a power unit, and a cover member that covers the upper surfaces of these are integrally pivotally connected to the vehicle body frame, and
In an intake system for a tricycle in which an air cleaner is arranged below the cover member, the lower part of the intake duct consisting of an upper inlet duct and a lower inlet duct is connected to the air cleaner, and the upper part of the intake duct is connected to the cover member. Penetrates the rearmost part of the top surface,
This is an air intake device for a motor tricycle, which extends along the upper surface and opens at the center of the upper surface of the cover member forward of the center of the rear axle, the cover covering the upper surface of the rear wheel and power unit. The member prevents dust, etc. from dispersing above the cover member,
Atmospheric air is sucked in through the suction duct that opens at the center of the cover member forward of the center of the axle, which is the optimal position to prevent dust from being inhaled. The air flows rearward, is introduced into the cover from the rear end of the top surface, and is sucked into the air cleaner via a sufficient air supply passage.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

A scooter-type automatic tricycle 1 is composed of a front body 2 and a rear body 10. The front body 2 has a steering front wheel FW, and the rear body 10 has a pair of left and right driving rear wheels RW. It is set up. Rear body 1
0 is connected to the vehicle body frame 3 of the front vehicle body 2 via a connection mechanism 4. The coupling mechanism 4 is composed of a case 5 pivotally connected to the body frame 3 of the front body 2 so as to be able to swing vertically, and a shaft 6 that is rotatably inserted into the case 5. 3 and case 5.

The rear vehicle body 10 is located between a pair of left and right rear wheels RW and is formed of a power unit 12 that supports a rear wheel drive shaft, and a cover 11 that covers each rear wheel RW and the power unit 12.

Therefore, behind the cylinder 13 in the power unit 12, the transmission case 14
An air cleaner 15 is arranged above.
On the rear wall of the case 16 of the air cleaner 15,
Communication pipes 17, 18, and 19 are integrally provided, oriented in the longitudinal direction of the vehicle body and communicating between the inside and outside of the case 16. Openings 17b, 18b, 19b are formed at the front ends of the communication pipes 17, 18, and 19 to open in the left-right direction of the vehicle inside the case 16, and openings 17b, 18b, and 19b are formed at the rear ends to open into the lower inlet duct 31 described later. Openings 17a, 18a, and 19a are formed.
In addition, a resonant silencer 2 is provided on the rear wall of the case 16.
A connecting tube 21 that communicates between the air cleaner 15 and the air cleaner 15 is attached. The resonant silencer 20 is located below the rear end of the communication pipe 19 (see FIGS. 2 and 3).

On the other hand, on the upper surface of the cover 11, an upper inlet duct 30 having the shape of an inverted gutter is disposed in close contact with the upper inlet duct 30 facing in the longitudinal direction of the vehicle body. The upper inlet duct 30 extends to the center of the cover 11, and its front end 30b opens to the atmosphere at a position forward of the center of the rear axle, as is clear from FIG.
The rear part is sealed by a rear wall 30c. The inside of the upper inlet duct 30 is partially partitioned by air guiding walls 30A and 30B that project from the upper wall 30a and left and right side walls 30d and 30e. The air guide walls 30A, 30B are inclined and protrude toward the front side of the vehicle body, and the air sucked into the upper inlet duct 30 from the open portion 30b is directed along the air guide walls 30A, 30B as shown by arrow A. It is formed to flow in a zigzag pattern (see Figure 4).

Further, an opening 11 provided at the rearmost part of the cover 11 covered by the rear end of the upper inlet duct 30
A lower inlet duct 31 made of soft synthetic resin and oriented in the vertical direction is hermetically fitted into the inlet a.
The upper part of this lower inlet duct 31 has a bellows shape 3.
1a, and the bottom wall 31c is a resonant silencer 20.
The drain hole 31d, which is close to the top wall and formed in the bottom wall 31c, has a drain hole 31d formed in the bottom wall 31c.
The area below it is shielded. Furthermore, the communication pipes 17 and 1 are connected to the front wall 31b of the lower inlet duct 31.
8 and 19 are hermetically connected, and the rear end opening 17
a, 18a, 19a are lower inlet duct 3
1 (see Figure 3).

In the above configuration, when the engine is operating, air is drawn into the cylinder 13 of the engine E via the air cleaner 15 and the carburetor through the open portion 30b of the upper inlet duct 39, and as shown by arrow A in FIG. Flowing in a zigzag pattern, the lower duct 31 and each communication pipe 17, 18,
It is electrically connected to the air cleaner 15 via 19.

Since the open portion 30b of the upper inlet duct 30 is located on the top surface of the cover 11, the dust kicked up by the rear wheels RW when driving on an unpaved road is effectively blocked by the cover 11. be done. Therefore, a large amount of coarse dust is not sucked into the air cleaner 15. However, this does not mean that no dust is inhaled into the upper inlet duct 30, and even when the vehicle is traveling on a paved road, dust floating in the atmosphere is inhaled. While flowing along the air guide walls 30A, 30B, this inhaled dust is peeped out due to inertial collision with each wall 30a, 30B, and is further removed from the upper inlet duct 3.
It is removed by inertial collision in the path descending from 0 to the lower inlet duct 31 and the path from the lower inlet duct 31 to the communication pipes 17, 18, and 19. In this way, in this embodiment, the air sucked into the air cleaner 15 is routed through the lower inlet ducts 30, 31 and the communication pipes 17, 18, 19 that define the suction port, so that the air is not contaminated with coarse particles. Dust is thoroughly removed before reaching the air cleaner element. Therefore, there is less burden on the air cleaner element.

Furthermore, the air guide walls 30A, 30B also have the function of preventing water from entering the upper inlet duct 30 when driving in the rain, washing the car, etc. The water that has entered the lower inlet duct 31 is discharged to the outside through a drain hole 31d formed in the bottom wall 31c. In addition, the rear end opening 1 of the communication pipes 17, 18, 19
7a, 18a, and 19a are located above the bottom wall 31a, so that water temporarily accumulated on the bottom wall 31a does not enter into the communication pipes 17, 18, and 19.

Furthermore, since the resonance type muffler 20 is arranged below the drain hole 31d, the dust kicked up by the rear wheel RW is directly transferred to the drain hole 31d.
It is not inhaled from d.

Effects of the Invention The present invention is constructed as described above, and the cover member that covers the upper surfaces of the rear wheels and power unit prevents dust, etc. from scattering upwards, and the cover member covers the opening of the intake duct. Since the cover member is provided at the upper part of the cover member by penetrating through the cover member, it is possible to effectively prevent dust from being sucked into the suction duct. Some of the dust still scattered on the cover member will be inhaled through the suction duct that is open on the cover member, but the opening position is the one where the least amount of dust is scattered and the best way to prevent dust from being sucked in. The optimum location is at the center of the top surface of the cover member and in front of the center of the rear wheel.
The dustproof effect can be further improved.

Furthermore, the suction duct is arranged rearward from the opening along the top surface of the cover member, passes through the cover member from the rearmost part of the top surface, is guided inward, and is connected to the air cleaner. Not only is it easy to install in the air cleaner, but it also provides a sufficient intake passage and improves dustproofing performance without compromising the capacity of the air cleaner. The degree of freedom in arrangement can also be improved.

[Brief explanation of the drawing]

Fig. 1 is a side view of a tricycle equipped with an intake device according to an embodiment of the present invention, Fig. 2 is a schematic enlarged side view of the same main part, and Fig. 3 is a cutaway explanatory view of the main part in Fig. 2. , FIG. 4 is a cross-sectional plan view of the main part of the rear part of the tricycle, and FIG. 5 is a longitudinal cross-sectional plan view of the rear part of the tricycle. DESCRIPTION OF SYMBOLS 1...Auto tricycle, 2...Front body, 3...Body frame, 4...Connection mechanism, 5...Case, 6...
...Axle, 7... Reaction, 10... Rear body,
11... Cover, 11a... Opening, 12... Power unit, 13... Cylinder, 14... Mission case, 15... Air cleaner, 16...
Case, 17, 18, 19...Communication pipe, 20...
Resonant silencer, 21... connecting tube,
30... Upper inlet duct, 31... Lower inlet duct.

Claims (1)

[Scope of utility model registration request] The vehicle has a front steering wheel and two rear wheels for driving, a power unit is disposed between the two rear wheels for driving, and the two rear wheels for driving, the power unit, and a cover member that covers the upper surfaces thereof are integrated with the vehicle body frame. In an intake system for a tricycle, the air cleaner is pivotably mounted on the cover member, and an air cleaner is disposed below the cover member.
An intake duct for a motor tricycle characterized in that an intake duct extends above the rearmost part of the upper surface of the cover member, extends along the upper surface, and opens at a central position on the upper surface of the cover member forward of the center of the rear axle. Device.