CN1369624A - Waste gas purifier of light motorcycle type vehicle - Google Patents

Abstract

An exhaust gas purification device for a moped-type vehicle, wherein a rear wheel 21 is supported at the rear of a swing-type power unit 18 that is freely swingably connected to a vehicle frame, and a rear fender 35 is disposed above the rear wheel 21, And supported to the rear frame 23 . The box portion of the sub-air cleaner 40 is integrally provided at the front portion of the rear fender 35, and is connected to the two-stage air control valve 42 of the rear frame 23 supported in front of it by an ignition coil 48, and is connected to the air control valve 42 through a rubber hose 44. And a metal pipe 45 connects the 2-stage air control valve 42 to the exhaust passage of the engine 30 .

Description

Exhaust gas purification device for moped-type vehicles

technical field

The invention relates to an exhaust gas purification device for a moped-type vehicle.

Background technique

It is a known technology to install a two-stage air control valve and a secondary air filter for sending clean air to the two-stage air control valve on a portable vehicle with a swing-type power unit. -50140 discloses a structure in which a 2-stage air control valve is mounted to the muffler, and a secondary air cleaner formed independently of other components is supported to the rear end of the frame behind it, and the hose is connected to the 2-stage air control valve and secondary air filter.

However, as in the above-mentioned conventional example, when the sub-air cleaner is independently installed, the number of parts of the sub-air cleaner itself increases, and the number of parts required to install it on the side of the frame is increased. In addition, the installation man-hours also increase. In addition, it is desired to improve the layout where the sub-air cleaner is arranged in consideration of the characteristics of the moped-type vehicle to obtain good space efficiency, and it is also desired to improve the durability of the sub-air cleaner in consideration of improvement.

Contents of the invention

In order to solve the above-mentioned problems, a first aspect of the present invention provides an exhaust gas purification device for a moped-type vehicle in which an engine and a transmission case are integrally formed at the rear of which the swinging of the rear wheels will be supported. The type power unit is suspended to the rear of the vehicle body, and at the same time, the second-stage air is sent from the auxiliary air filter to the exhaust channel of the engine through the second-stage air control valve to purify the exhaust gas; The fender is supported by the vehicle frame, and a box portion of the sub-air cleaner is integrally formed with the fender.

On the basis of the above first aspect, the second aspect of the present invention also has the following features: an air filter for engine air intake is arranged on the side of the rear wheel above the transmission box of the above-mentioned oscillating power unit; The above-mentioned sub-air cleaner is arranged on the opposite side of the vehicle body from the air cleaner to the rear wheels.

A third aspect of the present invention is based on the above-mentioned first aspect, and is further characterized in that the air intake port of the sub-air cleaner opens toward the rear of the vehicle body on the rear fender.

According to the first aspect, since the box portion of the sub-air cleaner is integrally formed with the rear fender, even if the sub-air cleaner is provided, an increase in the number of parts corresponding to the box portion can be suppressed. Furthermore, since it is not necessary to separately support the sub-air cleaner on the vehicle frame, man-hours for installation can also be reduced.

According to the second aspect, since the air cleaner and the sub-air cleaner are arranged separately on both sides of the vehicle body with the rear wheels interposed, the sub-air cleaner can be arranged with good space efficiency by utilizing the characteristics of a moped-like vehicle .

According to the third aspect, since the air inlet of the sub-air cleaner is opened toward the rear of the vehicle body on the rear fender, the sub-air cleaner can attract dust and dust splashed by the rear wheels on the rear fender. Water, etc. is mixed with less air, extending the cleaning cycle of the air filter.

Description of drawings

FIG. 1 is a side view of a moped-type vehicle to which this embodiment is applied.

FIG. 2 is a side view showing the internal structure of the rear portion of the body of the moped-type vehicle.

Fig. 3 is a plan view of the same part.

Fig. 4 is a sectional view of the sub-air cleaner portion (the sectional view taken along line 4-4 in Fig. 3 ).

Fig. 5 is a diagram for explaining the function of the rear portion of the moped-type vehicle in Fig. 1 .

Detailed ways

An embodiment will be described below with reference to the drawings. Fig. 1 is a side view of a moped-type vehicle to which this embodiment is applied, Fig. 2 is a diagram showing the internal structure of the rear part of the vehicle body of the moped-type vehicle, Fig. 3 is a plan view of the same part, and Fig. 4 is a side view of the moped-type vehicle. A cross-sectional view of the air cleaner part (cross-sectional view along line 4-4 in Fig. 3), and Fig. 5 is a diagram showing the side effect of the rear part of the vehicle body.

First, the entire vehicle body will be briefly described. The symbol 1 in Fig. 1 is the front wheel, the symbol 2 is the front fork, the symbol 3 is the front fender, the symbol 4 is the metal front cover, the symbol 5 is the metal or resin front and rear cover, and the symbol 6 is the resin Steering handle cover, symbol 7 is headlight, symbol 8 is steering handle.

The central part of the vehicle body constitutes a low-floor pedal 10 serving as a footrest, and a hollow rear cover 11 that is vertically opened up and upright at a predetermined height and extends long rearward is provided at a rear portion thereof. The rear cover 11 is made of metal or resin, and the upper opening is opened and closed by a seat 12 extending in the front-rear direction. Inside the rear cover 11 is provided a storage box 13 open upwards, which has a large capacity for storing large items such as a helmet.

Below the pedal 10, the main frame 14 of metal pipes extending in the front-rear direction along the center of the vehicle body and the transverse tube 15 extending in the left-right direction at its rear end are arranged. The connecting rod 17 of the connecting rod supporting part 16 protruding from the rear connects the arm 19 extending forward from the power unit 18 bottom, and the rocking type power unit 18 swings freely up and down with its connection points 20a and 20b as the swing center.

A rear wheel 21 is supported on the rear end side of the swing-type power unit 18, and a rear shock absorber 22 is connected to a rear frame 23, thereby suspending the swing-type power unit 18 to the rear of the vehicle frame.

The rear frame 23 is generally U-shaped in a plan view, and a pair of left and right sides are arranged substantially parallel to the front and back from the front end to the rear. The main frame 14, the cross pipe 15, and the rear frame 23 are integrated to form a vehicle frame.

As shown in FIG. 2 , the spare tire mounting pipe 24 at the rear end of the rear frame 23 protrudes upward and extends from the back side of the rear cover 11 to the outside, where it supports the spare tire 25 ( FIG. 1 ).

The oscillating power unit 18 integrates the 4-stroke air-cooled engine 30 on the front side and the transmission box 31 at the rear. The rear wheel 21 is supported on the rear end side.

An air cleaner 32 is supported on the transmission case 31 as a main air cleaner for intake air of the engine 30 relative to a sub air cleaner to be described later. A breather box 33 is provided at the front end of the air cleaner 32, and a breather pipe 34 is connected from the top of the cylinder head of the engine 30 here, and the unburned gas of the engine 30 is recovered to the breather box, and then returned to the carburetor (described later) ).

A resin-made rear fender 35 is disposed above the rear wheel 21 and is supported by the rear frame 23 . The supporting part is provided at the front and rear parts of the rear fender 35, the front part is integrally formed and the mounting part 35 protruding upward is connected to the stay 27 protruding downward from the transverse tube 26 of the rear frame 23, and the rear part is integrally formed. Mounting portions 37 protruding upward are formed and attached to stays 28 protruding downward from the rear end portion of the rear frame 23 by bolts 38 and nuts 29 .

As shown in FIG. 3 , a sub air cleaner 40 is integrally provided on the vehicle body right side opposite to the air cleaner 32 with respect to the rear wheel 21 at the front end of the rear fender 35 . A rubber hose 41 extends forward from the bottom of the sub-air cleaner 40 and is connected to a secondary air control valve 42 for exhaust gas purification disposed in front of the sub-air cleaner 40 .

The two-stage air control valve 42 incorporates an air volume control valve for controlling the air supply amount and a needle reed valve as a check valve for preventing backflow of exhaust gas. The needle reed valve prevents the exhaust gas from the exhaust passage from flowing back toward the air volume control valve and the secondary air filter. The air volume control valve is connected to the intake side of the engine through the negative pressure pipe 43, and when the engine decelerates, it cuts off the supply of secondary air to the exhaust passage, preventing re-ignition in the muffler.

The secondary air control valve 42 is connected to the engine 30 by a rubber hose 44 and a metal pipe 45 . The rubber hose 44 protrudes and bends forward in the plan view of FIG. 3 , straddles the engine 30 in the left and right directions, and generally forms a ㄑ shape in the side view ( FIG. 2 ), with one end side obliquely rearward on the right side of the vehicle body. It extends upward and is connected to a front joint 42a ( FIG. 3 ) provided in front of the secondary air control valve 42 . The joint 42a of the two-stage air control valve 42 protrudes forward and downward from the front of the two-stage air control valve 42 integrally, and moves along with the direction in which the rubber hose 44 of the swing-type power unit 18 moves (FIG. 2 The direction of the arrow A) is roughly the same.

The other end side extends to the left side of the motor 30, as shown in Figure 2, bends towards the left side of the motor 30 obliquely, and is connected with one end of the metal pipe 45 by the joint 45a, and is prevented from falling off by the fixing part 45b (Fig. 3). The orientation of the joint 45a is substantially the same as the rocking direction of the upper end of the metal pipe 45 rocking together with the rocking power unit 18 (arrow B direction in FIG. 2 ).

The metal pipe 45 extends vertically on the left side of the engine 30 , and the other end is wound around the lower side of the engine 30 to be connected to an exhaust passage of the engine 30 . One end of an exhaust pipe 46 is connected to the exhaust passage of the engine 30 . The exhaust pipe 46 extends downward from the engine 30 to the right side of the vehicle body, and is connected to a muffler 47 disposed on the right side of the rear wheel 21 . The muffler 47 is located below the sub-air cleaner 40 .

The secondary air control valve 42 is attached to the valve stay 29 protruding downward from the rear frame 23 on the right side of the vehicle body. In addition, an ignition coil 48 is supported at a portion connected to the valve stay 29 , and a high-voltage coil cord 49 is connected from the ignition coil 48 to a spark plug of the 4-stroke air-cooled engine 30 .

As shown in FIG. 4 , the shell portion 50 of the auxiliary air cleaner 40 is integrally formed with the rear fender 35 , and a connecting pipe 51 protruding downward is integrally formed at the bottom front end thereof, where the rubber hose 41 is connected from below. one end.

The case part 50 is opened upward, and the air filter 52 is accommodated in this opening part, and the cover 53 is covered from above, and the cover 53 and the case part 50 are integrated by the bolt 54 inserted from below. The interior of the sub-air cleaner 40 is divided into a lower clean room 55 and an upper dirty room 56 by the air filter 52 .

An intake pipe 57 integrally formed with the cover 53 is connected to the dirty chamber 56 . The intake duct 57 extends horizontally rearward from the center of the cover 53 , protrudes rearward from the rear of the cover 53 , opens rearward above the rear fender 35 , and sucks air on the rear fender 35 from behind. The air entering the dirty chamber 56 from the intake pipe 57 is purified when entering the clean chamber 55 through the air filter 52 , and is sent to the secondary air control valve 42 after becoming clean air.

The symbol 60 in Fig. 3 is a connecting pipe, and the symbol 61 is a carburetor. The connecting pipe 60 is connected to the front of the air cleaner 32 to communicate with its clean room, while the front end is connected to the carburetor 61 . In addition, a thin tube 62 protruding from the breather box 33 is connected to an intermediate portion thereof, and the leaked gas is returned to the carburetor 61 . The carburetor 61 is connected to an intake passage of the engine 30 .

In addition, as shown in FIG. 5, the rear cover 11 and the seat 12 can rotate the front side upwards around the pivot 23a provided at the rear end of the rear frame 23, and this rotation state can be maintained by the stay 63. The parts related to the swing type power unit, which are arranged inside the rear cover 11 and described later, are maintained. In addition, reference numeral 64 shown in FIG. 2 denotes a fuel tank, which is placed above the rear fender 35 and supported by the rear portion of the rear frame 23 . The stay 63 supports the front end on the frame and the rear end on the rear fender in the housed state.

Next, the action of this embodiment will be described. As shown in FIGS. 3 and 4 , since the housing portion 50 of the sub-air cleaner 40 is integrally formed with the rear fender 35 , the sub-air cleaner 40 need not be provided separately, thereby suppressing an increase in the number of parts. Moreover, since the sub-air cleaner 40 is not attached to the rear frame 23, only the rear fender 35 is attached to the rear frame 23. Therefore, special sub-air cleaner mounting members such as special stays are not required, and The number of parts can be reduced, and an increase in installation man-hours can also be suppressed.

In addition, since the auxiliary air cleaner 40 and the air cleaner 32 are separately arranged on the left and right sides of the vehicle body with the rear wheel 21 interposed therebetween, the space above the muffler 47 on the right side of the rear shock absorber 22 can be used as an article arrangement space. The sub-air cleaner 40 is arranged with good space efficiency, which is characteristic of a moped-type vehicle with a relatively large headroom.

In addition, as shown in FIG. 4 , the sub-air cleaner 40 provided on the right end side of the front end of the rear fender 35 near the inner surface of the right side wall of the rear cover 11 directs the air intake pipe toward the rear above the rear fender 35 . 57 is open so that air is sucked from the space enclosed by the rear cover 11 and the rear fender 35 . For this reason, it can attract less polluted air that is difficult to enter such as dust and water splashed by the rear wheel 21, so it is not easy to block the mesh of the air filter 52, and the cleaning cycle of the air filter 52 can be extended.

In addition, as shown in Fig. 2 and Fig. 3, the metal pipe 45 which is integrally shaken with the oscillating power unit 18 is connected by the rubber hose 44 and the two-stage air control valve 42 fixed on the side of the rear frame 23. The rubber hose 44 is curved convexly forward in view, and at the same time, it is arranged across the upper part of the engine 30 in the left and right direction, so that the deformation of the long bent part of the rubber hose 44 can easily absorb the power accompanying swinging. The interval between the upper end of the metal pipe 45 and the secondary air control valve 42 changes due to the shaking of the unit 18 .

In addition, as shown in FIG. 2 , the rubber hose 44 is formed in a right-hand shape in a side view, and the right part of the rubber hose 44 generated by the swing of the swing-type power unit 18 on the side of the secondary air control valve 42 The moving direction (the direction of the arrow A) is substantially consistent with the protruding direction of the joint 42a, so the deflection acting on the connecting part is less, and it is not easy to disengage.

In addition, even on the side of the metal pipe 45, by aligning the direction of the joint 45a substantially with the swing direction (arrow B direction), the deviation and tear acting on the connecting portion is small, and it is difficult to disengage. Therefore, it is possible to reduce the deflection and pulling of the connection part of the secondary air pipes of the exhaust gas purification device, which is an inherent phenomenon caused by the use of the swing type power unit 18, so that it is difficult to disengage, and a highly reliable connection structure is formed. .

Furthermore, since the two-stage air control valve 42 is fixed to the rear frame 23, the swing portion is close to the swing centers 20a, 20b, and as a result, the swing amount is small, so the piping is easy to perform. However, the two-stage air control valve 42 may be provided arbitrarily on the side of the swing type power unit 18 such as the muffler 47 as in the above conventional example. In addition, the rubber hose 44 may be optionally replaced with elastic tubes such as metal flexible or elastic resin hoses and tubes.

Claims (3)

1. An exhaust gas purification device for a moped-type vehicle, the moped-type vehicle is integrally formed with an engine and a transmission box, and the swing-type power unit supporting the rear wheels is suspended to the rear of the vehicle body at the rear of the transmission box, and at the same time , through the 2-stage air control valve, the 2-stage air is sent from the auxiliary air filter to the exhaust channel of the engine to purify the exhaust gas; its feature is: the rear fender is arranged above the rear wheel, and it is supported on the frame , and at the same time, the box portion of the sub-air cleaner is integrally formed with the fender. 2. The exhaust gas purification device of the moped type vehicle according to claim 1, characterized in that: an air filter for engine air intake is configured on the side of the rear wheel above the transmission case of the above-mentioned rocking type power unit, and at the same time, The above-mentioned sub-air cleaner is arranged on the opposite side of the vehicle body to the air cleaner and the rear wheels. 3. The exhaust gas purifying device for a moped vehicle according to claim 1, wherein the air inlet of the sub-air cleaner opens toward the rear of the vehicle body on the rear fender.

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