JP2005240688A - Exhaust secondary air supply device of air cleaner integrated type - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust secondary air supply device of air cleaner integrated type, in which the air cleaner and the exhaust secondary air supply device are integrated. <P>SOLUTION: The exhaust secondary air supply device, which supplies secondary air to an exhaust passage of an engine for burning unburned components in exhaust gas, includes air cleaner cases 51, 52 housing an air cleaner element, a secondary air lead-out pipe 71 communicating with the cleaning side of the air cleaner 25, a valve rod 75 running through the air cleaner case 52 and slidably supported, a valve element 64 attached to one end of the valve rod 75 and opening and closing the opening part of the secondary air lead-out pipe, a diaphragm actuator 70 including a diaphragm 74 fixed on the other end of the valve rod 75, and a negative pressure lead-in pipe 72 connected to a negative pressure chamber 66 of the diaphragm actuator 70. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an exhaust secondary air supply device that supplies secondary air to an exhaust passage of an engine to burn unburned components in exhaust gas, and more particularly, an air cleaner integrated exhaust secondary air supply integrated with an air cleaner. Relates to the device.

As one of the exhaust secondary air supply devices, fresh air is sent from the air cleaner to the exhaust path to combine exhaust gas and air (oxygen) to promote oxidation of exhaust gas after the exhaust port (reburnt unburned residue) ), A secondary air introduction device (air injection system) that promotes more complete combustion and reduces the amount of unburned gas emission is disclosed in Patent Document 1.
JP 2003-343258 A

  In the above prior art, since the air cleaner and the secondary air introducing device are independent, not only the joint tube and clamp for supplying the purified air from the air cleaner to the secondary air introducing device are indispensable, but also the air cleaner In addition, since both of the secondary air introduction devices require the case member, the number of parts, the number of assembly steps, and the complexity of the assembly are inevitably increased.

  An object of the present invention is to solve all the above-described problems of the prior art and to provide an air cleaner integrated exhaust secondary air supply device in which an air cleaner and an exhaust secondary air supply device are integrated.

  In order to achieve the above-described object, the present invention provides an exhaust secondary air supply apparatus for supplying secondary air to an exhaust passage of an engine to burn unburned components in exhaust gas, and an air cleaner and an inner side of the air cleaner. It includes a secondary air outlet pipe that communicates with a valve body that opens and closes the secondary air outlet pipe inside an air cleaner, and is integrated with the air cleaner case.

According to the present invention, since the air cleaner and the exhaust secondary air supply device are integrated, the following effects are achieved.
(1) Since joint tubes and clamps that are indispensable in the prior art are not required to connect the two, it is possible to reduce the number of parts and simplify the assembly man-hours.
(2) Since the case member can be shared by the air cleaner and the exhaust secondary air supply device, the case member can be reduced.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall side view of a motorcycle 1 equipped with an air cleaner-integrated exhaust secondary air supply device according to the present invention. A vehicle body front portion 2 and a vehicle body rear portion 3 are connected via a low floor portion 4 and are The body frame including the tube 6 and the main pipe 7 constitutes the skeleton of the vehicle body. The fuel tank and the storage box (both not shown) are supported by the main pipe 7, and the seat 8 is disposed above the fuel tank and the storage box. The seat 8 can also serve as a lid of a luggage box provided in the lower portion thereof, and the seat 8 is configured to be opened and closed by a hinge mechanism provided in the front portion thereof.

  In the vehicle body front part 2, a headlamp unit 20 is mounted on a front cowl 21, and a steering head 5 is provided on a down tube 6. The front fork 9 is pivotally supported by the steering head 5. A handle 11 is attached to the upper end of the front fork 9 extending upward, and a front wheel Wf is pivotally supported on the lower end. The upper part of the handle 11 is covered with a handle cover 10 that also serves as an instrument panel.

  A link member (hanger) 14 is pivotally supported in the middle of the main pipe 7, and the swing unit 17 is swingably connected to the main pipe 7 by the hanger 14. A single-cylinder four-cycle engine E is mounted on the front portion of the swing unit 17. A belt-type continuously variable transmission 12 is constructed from the engine E to the rear, and a rear wheel Wr is pivotally supported by a speed reduction mechanism 13 provided via a centrifugal clutch at the rear thereof. A rear suspension 22 is interposed between the upper end of the speed reduction mechanism 13 and the upper bent portion of the main pipe 7. An intake pipe 23 extending from the cylinder head 19 of the engine E is connected to the front portion of the swing unit 17, and a vaporizer 24 and an air cleaner 25 connected to the vaporizer 24 are disposed in the intake pipe 23. Has been.

  FIG. 2 is a cross-sectional view of a first embodiment of an air cleaner integrated exhaust secondary air supply apparatus according to the present invention, where the same reference numerals as those described above represent the same or equivalent parts.

  The air cleaner 25 mainly includes an atmosphere-side case half 51 and a purification-side case half 52, and a filter element 53 inserted through a connection portion between the case halves 51 and 52. An exhaust secondary air supply device 60 is formed integrally with the purification-side case half 52, and an intake port 55 of the intake pipe 54 is opened on the purification side inside the air cleaner 25.

  The purification-side case half 52 is integrally provided with a secondary air outlet pipe 71, and the exhaust secondary air supply device 60 is integrally provided with a negative pressure introduction pipe 72. The secondary air outlet pipe 71 is connected to an exhaust path 83 via a pipe 81. The negative pressure introducing pipe 72 is connected to an intake passage 84 via a vacuum pipe 82. A reed valve (not shown) for preventing the backflow of exhaust gas to the air cleaner 25 is disposed between the secondary air outlet pipe 71 and the exhaust port (not shown) of the engine.

  FIG. 3 is an enlarged cross-sectional view of the exhaust secondary air supply device 60. The same reference numerals as those described above represent the same or equivalent parts.

  The exhaust secondary air supply device 60 is formed integrally with the purification-side case half 52 in communication with the valve chamber 61 and a bobbin-shaped valve chamber 61 formed on the inner wall surface of the purification-side case half 52. The secondary air outlet pipe 71, the valve body 64 that opens or closes the valve chamber 61 to communicate or block the purification side of the air cleaner 25 and the secondary air outlet pipe 71, and the diaphragm that drives the valve body 64 to open and close. The actuator 70 is a main component.

  The diaphragm actuator 70 is airtightly sandwiched between a diaphragm body 73 in which a negative pressure introducing pipe 72 is integrally formed, an outer peripheral portion of the diaphragm body 73 and an outer surface of the purification-side case half 52. And a valve rod 75 having one end secured to the central portion of the diaphragm 74. The valve rod 75 is supported in a support cylinder 62 provided in the valve chamber 61 so as to be slidable in the axial direction so as to penetrate the purification-side case half 52, and the valve body 64 is attached to the other end. Has been.

  The space covered with the diaphragm body 73 and the diaphragm 74 forms a negative pressure chamber 66, and the negative pressure chamber 66 communicates with the negative pressure introduction pipe 72 through the throttle hole 76. A space covered with the diaphragm 74 and the outer surface of the purification-side case half 52 forms an atmospheric pressure chamber 67. That is, in this embodiment, the purification-side case half 52 also serves as a part of the case of the exhaust secondary air supply device 60.

  The secondary air lead-out pipe 71 is connected to an exhaust port via a pipe 81, and a reed valve for preventing a backflow of exhaust gas to the air cleaner 25 between the secondary air lead-out pipe 71 and the exhaust port (see FIG. (Not shown) is arranged. The negative pressure introduction pipe 72 is connected to the intake port via the vacuum pipe 82, whereby the negative pressure in the intake port acts on the negative pressure chamber 66.

  The return spring 77 is a coil spring that surrounds the support cylinder portion 62 and has a spring force in a direction in which the valve body 64 is separated from the valve seat 68, that is, in a direction in which the diaphragm 74 of the diaphragm actuator 70 is bent toward the atmospheric pressure chamber 67. Is provided between the bottom portion of the valve chamber 61 and the valve body 64.

  In such a configuration, the vacuum tube 82 becomes negative pressure during intake, and negative pressure is generated in the negative pressure chamber 66 via the negative pressure introduction pipe 72, so that the diaphragm 74 is bent toward the negative pressure chamber 66, Accordingly, the valve rod 75 is sucked against the spring force of the return spring 77. As a result, since the valve body 64 is seated on the valve seat 68, the air cleaner 25 and the exhaust path 83 are blocked, and the backflow of exhaust gas from the exhaust path 83 to the air cleaner 25 is prevented.

  Further, when a pulsation negative pressure is generated in the exhaust path 83 due to the exhaust pulsation, a negative pressure is generated in the secondary air outlet pipe 71, so that fresh air is introduced from the air cleaner 25 into the exhaust path 83 via the valve chamber 61. Thereby, the unburned gas in the exhaust path is burned, and most of the hydrocarbons and carbon monoxide are converted into carbon dioxide and water.

  FIG. 4 is a cross-sectional view of a second embodiment of an air cleaner-integrated exhaust secondary air supply apparatus according to the present invention, where the same reference numerals represent the same or equivalent parts.

  In the first embodiment described above, the valve chamber 61 and the secondary air outlet pipe 71 are described as being integrally formed with the purification-side case half 52 of the air cleaner. However, in the present invention, the separate member 59 is used as the purification-side case half 52. The case secondary body 52 is airtightly fixed to the opening of the case half 52 with an appropriate fastener such as a screw screw 58 via O-links 56, 57. It is characterized in that it is integrated.

1 is an overall side view of a motorcycle equipped with an air cleaner integrated exhaust secondary air supply device according to the present invention. It is sectional drawing of 1st Embodiment of an air cleaner integrated exhaust secondary air supply apparatus. It is an expanded sectional view of the exhaust secondary air supply device shown in FIG. It is sectional drawing of 2nd Embodiment of an air cleaner integrated exhaust secondary air supply apparatus.

Explanation of symbols

  25 ... Air cleaner, 51 ... Air side case half, 52 ... Purification side case half, 53 ... Filter element, 60 ... Exhaust secondary air supply device, 61 ... Valve chamber, 62 ... Support cylinder, 64 ... Valve DESCRIPTION OF SYMBOLS 70 ... Diaphragm actuator, 71 ... Secondary air extraction pipe, 72 ... Negative pressure introduction pipe, 73 ... Diaphragm body, 74 ... Diaphragm, 75 ... Valve rod, 76 ... Restriction hole

Claims (5)

In the exhaust secondary air supply device for supplying secondary air to the exhaust passage of the engine and burning unburned components in the exhaust gas,
An air cleaner integrated exhaust secondary air supply device, wherein the air cleaner is integrated with a case of the air cleaner. An air cleaner,
A secondary air outlet pipe communicating with the inside of the air cleaner;
A valve body that opens and closes the secondary air outlet pipe inside an air cleaner,
The air cleaner integrated exhaust secondary air supply device according to claim 1, wherein the air cleaner case is integrated with the air cleaner case. A valve stem that is slidably supported through the air cleaner case and has the valve body mounted on one end thereof;
A diaphragm actuator including a diaphragm fixed to the other end of the valve stem;
The air cleaner integrated exhaust secondary air supply device according to claim 2, further comprising a negative pressure introducing pipe connected to a negative pressure chamber of the diaphragm actuator.   4. The air cleaner integrated exhaust secondary air supply device according to claim 3, wherein the secondary air outlet pipe is formed integrally with an air cleaner case. The diaphragm actuator is
A diaphragm body integrally formed with the negative pressure introducing pipe;
Including a diaphragm that seals the negative pressure chamber with which the negative pressure introduction pipe communicates,
The air cleaner integrated exhaust secondary air supply device according to claim 4, wherein the diaphragm body is airtightly attached to an outer surface of the air cleaner case.

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