JP2002242670A - Secondary air supply device for motor scooter type motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a secondary air supply device for a motor scooter type motorcycle realizing an air cleaner for secondary air supply having the freedom of a shape and ensuring capacity, and reducing the generation of noise. SOLUTION: This secondary air supply device 2 for the motor scooter type motorcycle has a storage box 4 under a seat 3 for a driver and a gasoline tank 5 in a body rear part, and a second air cleaner 7 for secondary air supply connected to an exhaust route. The second air cleaner 7 is installed within a space formed in the lower part of a step floor 15 of a body constituted in the lower part on the front side of the seat 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for purifying exhaust gas from a motorcycle, and more particularly to a secondary air supply device for a scooter-type motorcycle that supplies secondary air to an exhaust system.

[0002]

2. Description of the Related Art In general, a scooter type motorcycle is equipped with a unit swing type engine. This unit swing type engine has an engine as a driving source,
A transmission case including a V-belt type automatic transmission mechanism for controlling drive transmission from the engine and a power transmission mechanism is provided, and the engine and the transmission case are integrally unitized.

In recent scooter type motorcycles,
In general, the above-described unit swing type engine is mounted on the lower rear side of the vehicle body, a gasoline tank is arranged on the rear side of the vehicle body, and a storage box is provided below the driver's seat. In a motorcycle of this type, a system in which an air cleaner for supplying air is disposed above the engine is often used. However, the space below the driver's seat is limited, and it is difficult to secure the capacity of the storage box and increase the capacity of the air cleaner main body.

[0004] As a measure against environmental problems, there has been known a system in which an air cleaner for supplying secondary air to an engine exhaust system for purifying exhaust gas is shared with an engine air cleaner body. According to this method, there has been a problem that the negative pressure of the air cleaner main body becomes high, and the air supply to the secondary air side becomes insufficient, which is disadvantageous for exhaust gas purification.

Therefore, as disclosed in Japanese Patent No. 3068172, a scooter-type motorcycle in which a storage box is disposed below a driver's seat and a gasoline tank, an oil tank, and the like are disposed behind a vehicle body,
2 between the storage box inside the body cover and the body cover
A method of arranging an air cleaner for supplying the next air has been proposed.

[0006]

However, according to this method, in a scooter type motorcycle, a space for installing an air cleaner for supplying secondary air in a vehicle body portion in a frame cover is small, and it is difficult to secure the capacity of the air cleaner. In addition, there is a problem that there is no freedom to arrange the air cleaner, and the shape tends to be complicated.

Further, as disclosed in Japanese Patent Application Laid-Open No. 5-321657, there has been proposed a system in which a cleaner for supplying secondary air is disposed behind a vehicle body in a motorcycle equipped with a unit swing type engine. However, according to this method, the piping for connection is long, the piping loss of the secondary air supply is large, interference with other parts is large, it is difficult to lay the piping, and the cost increases. There was a problem.

Further, as disclosed in Japanese Patent Application Laid-Open No. Hei 10-218062, in a motorcycle equipped with a unit swing type engine, a clean chamber is formed below a footrest to introduce air into an air cleaner. A method has been proposed in which the opening at the end of the duct is communicated. According to this method, clean air can be supplied from the clean chamber to the air cleaner. It does not play a role as a secondary air supply device for the air, and it is not a space for arranging an air cleaner for the secondary air supply.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and can realize an air cleaner for supplying secondary air, which has a degree of freedom in shape and can secure a sufficient capacity, and reduces noise. It is another object of the present invention to provide a secondary air supply device for a scooter type motorcycle.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a secondary air supply device for a scooter-type motorcycle, which comprises a storage box below a driver's seat and a gasoline tank at the rear of the vehicle body. And a scooter-type motorcycle including a second air cleaner for supplying secondary air connected to an exhaust path, wherein the second air cleaner is formed below a vehicle body step floor formed below a driver's seat front side. It is provided in the space that is used.

It is preferable that the second air cleaner is provided in a space formed between the frame main tube and the side lower cover. It is preferable that a second air cleaner and a battery are disposed on both sides of the frame main tube below the vehicle body step floor.

An inlet hose is connected to the second air cleaner, and the inlet hose is connected to a second air cleaner.
The air cleaner is attached rearward along the vehicle body, and one end side is inserted into the frame subtube to be opened in the tube, and a communication hole for communicating the inside of the tube with the outside is provided at the lower portion of the frame subtube. Is preferred. Further, an air cleaner hose connected to the second air cleaner is disposed substantially along the frame subtube together with the inlet hose, and is connected to a secondary air control valve provided on an upper part of the engine in which a cylinder is arranged forward. Is preferred. Further, it is preferable that the secondary air control valve is disposed close to and forward of an intake duct provided on an upper surface of the engine. Further, it is preferable that a secondary air control valve is integrally provided in a second air cleaner installed below the step floor of the vehicle body.

According to the present invention, the following effects can be obtained. That is, in a scooter-type motorcycle provided with a second air cleaner for supplying secondary air, the second air cleaner is provided at a lower portion of a vehicle body step floor formed below a front side of a driver's seat to thereby provide a lower portion of the vehicle body step floor. By effectively utilizing the space, the shape of the second air cleaner can be given a degree of freedom, a large capacity can be ensured, and noise accompanying secondary air supply can be reduced.

Further, by providing the second air cleaner between the frame main tube and the side lower cover, the components related to the secondary air supply device can be concentrated in front of the engine. The behavior of hoses against movement can be reduced, and the durability can be improved.

Further, since the second air cleaner and the battery are disposed on both sides of the frame main tube below the step floor of the vehicle body, the center of gravity is low, and the weight balance of the vehicle body is not significantly impaired. It is possible to improve running stability.

In addition, an inlet hose connected to the second air cleaner is provided rearwardly along the vehicle body from the second air cleaner, and one end of the inlet hose is inserted into the frame subtube so as to be disposed during traveling. The effect of the outside air due to dust and the like can be suppressed, more clean air can be introduced into the second air cleaner, and noise accompanying secondary air supply can be further reduced.

Further, an air cleaner hose connected to the second air cleaner is disposed substantially along the frame subtube together with the inlet hose, and is connected to a secondary air control valve provided at an upper portion of the engine in which the cylinder is inclined forward. By connecting, the hoses can be bundled together and arranged in the vicinity of the claim subtube.

Further, by disposing the secondary air control valve close to the front of the intake duct provided on the upper surface of the engine, the secondary air control valve hose (for example, a reed valve hose) is disposed in front of the cylinder head of the engine. Therefore, it is possible to directly receive the traveling wind, so that the durability of the secondary air control valve hose can be improved irrespective of the arrangement around the cylinder head where the temperature becomes high.

Also, by providing the secondary air control valve integrally with the second air cleaner, the structure of the secondary air supply device can be simplified, so that the workability can be improved and
Cost can be reduced.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 5 show an example of an embodiment of the present invention. In the drawings, portions denoted by the same reference numerals as those in the drawings represent the same components. FIG. 1 is an overall side view showing a configuration of a scooter type motorcycle employing a secondary air supply device according to an embodiment of the present invention. FIG. 2 is an overall plan view showing a configuration of the scooter type motorcycle. FIG. 1A shows a configuration of a vehicle body step floor of the scooter type motorcycle.
FIG. 4 is a side view showing a configuration of the secondary air supply device, and FIG. 5 is a plan view showing a configuration of the secondary air supply device.

As shown in FIG. 1, this embodiment is a scooter-type motorcycle 1 in which a secondary air supply device 2 for a scooter-type motorcycle according to the present invention is employed. A storage box 4 is provided, a gasoline tank 5 is disposed at the rear of the vehicle body, and a unit swing type engine 6 is mounted on the lower side of the vehicle body, and a second air cleaner 7 for supplying secondary air is connected to an exhaust path thereof. It is provided with.

As shown in FIGS. 1 and 2, the scooter type motorcycle 1 has a handlebar 11 held by a frame (not shown) at a vehicle body front portion 8 and is connected to a lower portion of the handlebar 11. A front wheel 14 is rotatably held by a front fork 12. The body front part 8
A seat 3 is held further rearward, and between the front portion 8 of the vehicle body and the seat 3, in a lateral width direction with respect to a vehicle traveling direction in which an occupant on the seat 3 can place both feet. A floor portion 18 is formed by a step floor 15 formed over the center floor and a center console 17 standing up above the step floor 15.

A rear cover 19 is provided behind the floor 18 to cover the rear of the vehicle body. Below the rear cover 19, a unit swing type engine 6 is swingable by a swing pivot 20 provided at the rear end of the vehicle body frame. A rear wheel 21 is attached to the engine 6.

Above the rear wheel 21, a rear fender 2
2 is fixed to the rear cover 19 and covers the rear wheel 21 from above. The seat 3 is provided on the upper side of the rear cover 19 over substantially the entire length behind the vehicle body.
A storage box 4 is formed on the lower side. The seat 3 serves as a lid of the storage box 4. As shown in FIG. 4, a gasoline tank 5 is disposed behind the storage box 4, and an oil tank 9 is disposed below the gasoline tank.

As shown in FIG. 4, the unit swing type engine 6 has a cylinder 61 disposed substantially horizontally forward and inclined, and a crankcase (not shown) behind the cylinder 61 has an axial center in the vehicle width direction. A crankshaft (not shown) is arranged in the direction. A transmission mechanism 62 for transmitting drive to the rear wheels 21 is provided on the left rear side of the engine 6 in the vehicle body traveling direction.

An exhaust duct 64 is connected to a lower portion of a cylinder head 63 disposed in front of the cylinder 61.
An intake duct 65 is connected to an upper portion of the crankcase. A secondary air supply reed valve 24 is disposed above the cylinder head 63 and in front of the intake duct 65.

The transmission mechanism 62 includes a driving pulley 62a connected to the crankshaft, and a driving pulley 6a.
2a, and a driven pulley that transmits the rotational motion of the crankshaft via the V-belt 62b and transmits the drive to a rear axle (not shown) on which the rear wheel 21 is supported. 62c, and is housed in a transmission case 60 formed integrally with the crankcase. An air cleaner box 66 is provided on the upper outside of the transmission case 60.
The first air cleaner (not shown) is housed in the air cleaner box 66.

The second air cleaner 7 is shown in FIGS.
As shown in the figure, the lower part of the step floor 15 is installed between the frame main tube 32 and the side lower cover 33 via the step floor frame bracket 31,
The battery 34 is sandwiched between the frame main tube 32 and the battery 34.
Is arranged.

As shown in FIGS. 4 and 5, the frame main tube 32 has a frame subtube 37 extending obliquely rearward and upward along the rear cover 19, as shown in FIGS. The frame sub-tube 37 is made of a metal pipe material, and a front end 37a connected to the rear end of the frame main tube 32 has a communication hole communicating the inside of the frame sub-tube 37 with the atmosphere. On the other hand, a rear end 37b of the frame subtube 37 is formed with an opening.

As shown in FIGS. 4 and 5, an inlet hose 41 and an air cleaner hose 42 are provided at the rear end 7a of the second air cleaner 7 on the vehicle body side. The inlet hose 41 has one end 41a connected to the second air cleaner 7 and is provided obliquely rearward and upward along the frame subtube 37 from the second air cleaner 7, and has the other end 41b connected to the frame. The sub tube 37 is inserted and arranged at the opened rear end 37b.

The air cleaner hose 42 is provided substantially in parallel with the inlet hose 41, and has one end 42a.
Is connected to the second air cleaner 7, and the other end 42b is connected to the secondary air supply reed valve 24 above the cylinder head 63. A reed valve hose 25 is connected to the reed valve 24 for supplying secondary air.
Is connected to the other end 25a of the reed valve hose 25.
Is an exhaust duct 64 connected to a muffler (not shown).
It is connected to the.

Next, the operation of the secondary air supply device 2 according to this embodiment will be described. The introduction of air by the secondary air supply device 2 is performed by an inlet hose 41.
The air introduced from the inlet hose 41 is placed in the frame subtube 37 with the end 41b of the inlet hose 41 inserted into the opened rear end 37b of the frame subtube 37, so that the air is supplied during traveling. The air inside the frame sub-tube 37 can be taken in without directly taking in the outside air of the vehicle in which the dust is flying.

The air taken in from the inlet hose 41 is introduced into the second air cleaner 7 and purified through the filter 40. The purified clean air is sent to the secondary air supply reed valve 24 through the air cleaner hose 42, and is further supplied to the exhaust duct 64 through the reed valve hose 25. Thus,
By supplying air into the muffler from the exhaust duct 64, oxidation of the unburned gas components in the exhaust gas can be promoted.

According to the present embodiment, the second air cleaner 7 is provided between the frame main tube 32 and the side lower cover 33 in the lower portion of the step floor 15 of the vehicle body. By effectively utilizing the space below the step floor 15, the degree of freedom of the shape of the second air cleaner 7 can be increased, and a large capacity of the second air cleaner 7 can be ensured. Further, since the second air cleaner 7 is surrounded by the step floor 15 and the side lower cover 33, it is possible to reduce noise caused by the supply of the secondary air.

Further, according to the present embodiment, the components such as the second air cleaner 7, the inlet hose 41 and the air cleaner hose 42 constituting the secondary air supply device 2 can be gathered in front of the engine 6, so that the unit swing The behavior of the inlet hose 41, the air cleaner hose 42, and the like due to the swinging of the engine can be reduced, and the durability can be improved.

Further, according to the present embodiment, the second air cleaner 7 and the battery 34 are disposed on both sides of the frame main tube 32 below the step floor 15, so that the center of gravity of the vehicle body is low. The running stability can be improved without significantly impairing the weight balance.

Further, according to the present embodiment, the open end 41a of the inlet hose 41 is inserted into the frame subtube 37 from the rear end 37b of the frame subtube 37 which is opened, so that the dust during traveling can be reduced. And the like, the influence of the outside air can be suppressed, more clean air can be introduced into the second air cleaner, and the noise associated with the secondary air supply can be reduced.

Next, a modified example of the secondary air supply device according to the present embodiment will be described with reference to the drawings. FIG. 6 is a side view showing a configuration of an example of a modified example of the secondary air supply device according to the embodiment of the present invention. In the drawings, the portions denoted by the same reference numerals as those of the above-described embodiment represent the same components, and the description thereof is omitted. The basic configuration is the same as that of the above-described embodiment.

As shown in FIG. 6, a modified example of this embodiment is provided with a storage box 4 below the occupant seat 3, a gasoline tank 5 disposed at the rear of the vehicle body, and a unit swing below the vehicle body. Air supply device 1 for a motorcycle, which is equipped with a secondary engine 6 and has a second air cleaner 107 for supplying secondary air connected to an exhaust path thereof.
02, in which the secondary air supply reed valve 124 is integrally provided in the second air cleaner 107 installed below the step floor 15.

As shown in FIG. 6, the second air cleaner 107 is installed under the step floor 15 between the frame main tube 32 and the side lower cover 33 via the step floor frame bracket 31. A battery 34 is disposed with the main tube 32 interposed therebetween.

As shown in FIG. 6, an air cleaner hose 142 is provided at the rear end 107a of the second air cleaner 107 via the inlet hose 41 and the secondary air supply lead valve 124. One end 41a of the inlet hose 41 is connected to the second air cleaner 107, and the inlet hose 41 is provided obliquely rearward and upward along the frame subtube 37 from the second air cleaner 107, and the other end 41b is connected to the frame. The sub tube 37 is inserted and arranged at the opened rear end 37b.

One end 142a of the air cleaner hose 142 is connected to the second air cleaner 7 via a secondary air supply reed valve 124, and is attached substantially in parallel with the inlet hose 41. From around the front side of the cylinder 63, it goes under the cylinder head 63, passes under the swing pivot 20, and is connected to the exhaust duct 64.

The operation of the modified example is substantially the same as that of the above-described embodiment because the basic structure is substantially the same as that of the above-described embodiment.

According to the modified example, the secondary air control valve is provided integrally with the second air cleaner according to the modification, so that the air cleaner is directly provided without providing the reed valve hose 25 of the above embodiment. A hose 142 can be connected to the exhaust duct 64. Therefore, it is possible to simplify the device configuration of the secondary air supply device to improve workability and reduce costs.

The secondary air supply device for a scooter-type motorcycle according to the present invention is not limited to the above-described embodiments and modifications, and various modifications can be made without departing from the gist of the present invention. Of course.

[0046]

As described above, the first aspect of the present invention is as described above.
According to the secondary air supply device for a scooter-type motorcycle described in any one of the above-described items 7 to 7, the shape has a degree of freedom and the capacity can be ensured.
The second air cleaner for supplying the next air can be realized, and an excellent effect that noise can be reduced can be achieved. That is, by providing the second air cleaner below the step floor of the vehicle body, the space under the step floor of the vehicle body can be effectively used to allow the second air cleaner to have a degree of freedom and to secure a large capacity. And noise associated with the secondary air supply can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall side view showing the configuration of a scooter type motorcycle employing a secondary air supply device according to an embodiment of the present invention.

FIG. 2 is an overall plan view showing a configuration of the scooter type motorcycle.

FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1, showing a configuration of a vehicle body step floor of the scooter type motorcycle.

FIG. 4 is a side view showing a configuration of the secondary air supply device.

FIG. 5 is a plan view showing a configuration of the secondary air supply device.

FIG. 6 is a side view showing a configuration of an example of a modified example of the secondary air supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scooter type motorcycle 2, 102 Secondary air supply device 4 Storage box 6 Unit swing type engine 7, 107 Second air cleaner 15 Step floor 24, 124 Reed valve for secondary air supply 25 Reed valve hose 31 Frame for step floor Bracket 32 Frame main tube 33 Side lower cover 34 Battery 37 Frame sub tube 38 Communication hole 41 Inlet hose 42, 142 Air cleaner hose 64 Exhaust duct

Claims (7)

[Claims] 1. A scooter-type motorcycle including a storage box below a driver's seat, a gasoline tank disposed at a rear portion of a vehicle body, and a second air cleaner connected to an exhaust path for supplying secondary air. The secondary air supply device for a scooter-type motorcycle, wherein the second air cleaner is provided in a space formed below a vehicle body step floor formed below a driver's seat. 2. The secondary air for a scooter-type motorcycle according to claim 1, wherein the second air cleaner is provided in a space formed between a frame main tube and a side lower cover. Feeding device. 3. The scooter-type motorcycle according to claim 1, wherein a second air cleaner and a battery are arranged on both sides of a frame main tube below the vehicle body step floor. Air supply device. 4. An inlet hose is connected to the second air cleaner, and the inlet hose is provided to face rearward along the vehicle body from the second air cleaner, and one end of the inlet hose is inserted into a frame subtube. An opening is formed in the tube, and a communication hole for communicating the inside of the tube with the outside is provided at a lower portion of the frame subtube.
The secondary air supply device for a scooter type motorcycle according to any one of claims 3 to 3. 5. An air cleaner hose connected to the second air cleaner is disposed substantially along a frame sub-tube together with the inlet hose, and a secondary air provided at an upper portion of an engine in which the cylinder is inclined forward. The secondary air supply device for a scooter type motorcycle according to any one of claims 1 to 4, wherein the secondary air supply device is connected to a control valve. 6. The secondary air supply device for a scooter-type motorcycle according to claim 5, wherein the secondary air control valve is disposed in front of and near an intake duct provided on an upper surface of the engine. 7. The vehicle according to claim 1, wherein a secondary air control valve is integrally provided in a second air cleaner installed below the step floor of the vehicle body. Secondary air supply device for scooter type motorcycle.