JPS5893916A - Introducing device of secondary air in autobicycle - Google Patents

Abstract

PURPOSE:To easily set a device without causing the worsening of its appearance in the device which introduces secondary air into an exhaust pipe by utilizing exhaust pulsation, by accommodating a control valve in a secondary air introducing pipe in a specific space under a seat. CONSTITUTION:An upper intake pipe 10 and bottom exhaust pipe 11 extensibly arranged to the rear are equipped in an engine 3 of an outobicycle, and the pipe 11 is provided with an exhaust gas purifying catalyzer 13 located in the vicinity of a tail end of said pipe 11 while provided with a secondary air introducing pipe 14 branching from the upstream side of said pipe 11. This introducing pipe 14 is communicatively connected to an air cleaner 12 and interposed with a reed valve 15 and control valve 16 in the half way to the cleaner 12, here the valve 16 is accommodated in a space 17 surrounded by a seat (not shown in the drawing), rear fender 7 located to the rear below the seat and a battery box 9 located to the front of the fender 7. Both outsides of this space 17 are covered by a side cover 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for introducing secondary air into an exhaust pipe of an engine in a two-wheeled motor vehicle by utilizing exhaust pulsation.

The applicant of the present application first provided this device with an engine, a fuel tank above the engine, and a passenger seat behind the engine in the middle of a vehicle body having front and rear wheels, and an exhaust pipe extending rearward from the engine. We have proposed a type that includes a catalyst for exhaust purification and a secondary air introduction pipe that branches from the upstream side and has a reed valve and a control valve.1 In this case, the control valve is placed at an appropriate location on the vehicle body. Preferably, it does not take up much space, is protected from the outside, and does not spoil its appearance.

The purpose of the present invention is to obtain a device that meets these requirements, and includes an engine, a fuel tank above the engine, and a passenger seat behind the engine in the middle of a vehicle body having front and rear wheels. and a secondary air introduction pipe which branches from the upstream side and has a reed valve and a control valve; The battery pack is housed in a space surrounded by the seat, the rear raftender below the seat, and the battery box in front of the seat.

An example of implementing the present invention will be explained with reference to the attached drawings.

In the drawing, (1) indicates the vehicle body, and the vehicle body (1) includes front and rear wheels +21 +21, an engine (3) in the middle, a fuel tank (4) above it, and a passenger seat behind it. (5), so that the entire vehicle is configured as a two-wheeled motor vehicle. In the drawing, (6) is the front fender, (7)
A pair of left and right side covers (81 (8) are provided in front of the rear fender (7) and below the seat (5), and a battery box (9) is provided in front of the intermediate portion thereof. ).

Furthermore, the engine (3) has an upper intake pipe 00 extending rearward.
) and a lower exhaust pipe 01), and the intake pipe α0
) has an air cleaner 02 at its tail end, and furthermore, the exhaust pipe 0υ has a catalyst Q3 for exhaust purification located near its tail end.
1 and a secondary air introduction pipe (14) branched from the upstream side of G, the introduction pipe extending upward to connect to the above-mentioned air cleaner (121) and a reed valve Q! 5) and control valve 06) are interposed.

In the illustrated example, the engine (3) is a four-cylinder engine with two cylinders each on the - side and the other side, so the exhaust pipe αυ has two cylinders on one side and two on the other side. 2 each as it grows
The pipes are arranged to join each other on the downstream side, and the secondary air introduction pipe side is connected to two exhaust pipes Uυ for each [one pipe on each side is connected to the reed valve Q51s]. It is of a type that merges into one common valve and extends to the control valve α6).

As clearly shown in FIGS. 1 and 2, the control valve α6) is connected to the seat (5) and its lower rear rear suspension (
7) and the battery box (9) in front of it.
(8), and its configuration is, for example, as shown in FIG. The air cleaner (121) is equipped with an inlet (1 (
Sd) and the outlet (16e) on the lower surface connected to the reed valve Q5+, which is controlled to open and close. ). Furthermore, the control valve (16) has a solenoid valve (16) on its side.
6g), which is interposed between the negative pressure passage (16h) extending from the above-mentioned intake pipe (1 (+1) and the negative pressure chamber (I A i) on the back of the above-mentioned valve body (16o). , thus, according to the υIJ valve of the valve (16g), the valve body (1
6o) was applied with negative pressure on its back surface to open 1 and act to introduce secondary air through it. The secondary air is drawn into the exhaust pipe αυ by exhaust pulsation and guided downstream of the catalyst (+3) & knee, and the exhaust gas in the exhaust pipe Ql is The air-fuel ratio is adjusted to , and the gas is guided to the catalyst θ, so that a good reaction can be obtained.

In this way, according to the present invention, the control valve interposed in the secondary air introduction pipe is housed in a space surrounded by the seat on the upper side of the vehicle body, the front battery box below the seat, and the rear fender. It does not take up much space, does not spoil its appearance, is protected from the outside, and has the effect of always providing stable operation.

[Brief explanation of drawings]

Fig. 1 is a side view of an example of an automatic 2@car equipped with the device of the present invention, Fig. 2 is an enlarged side view with a part of its main parts cut out, and Fig. 3
The figure is a plan view from the ■-■ line, and Figure 4 is N-Fit.
It is a front view seen from a line. (1)...Car body (2X2+...Wheel (3)
)...Engine (4)...Fuel tank (
5)...C) (71-...Rear fender (9)φ-, battery box αυ--Exhaust pipe (+3)...Catalyst 0a...Secondary air introduction pipe (+5)...・Reed valve shout--control valve aη...2 people outside the space

Claims (1)

[Claims] An intermediate part of the vehicle body with front and rear wheels (an engine, a fuel tank above it, and a passenger seat behind it) is provided, and an exhaust pipe extending rearward from the engine is equipped with an exhaust purification catalyst and an upstream part thereof. In a type equipped with a secondary air introduction pipe that branches from the side and connects the reed valve and the control valve, the control valve is connected to the seat, the rear rear carrier 7 ender under the seat, and the battery box in front of the seat. A secondary air introduction device for driving a two-wheeled motor vehicle, which is housed in a space surrounded by a.