JP3970517B2 - Vehicle air cleaner structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air cleaner structure for a vehicle suitable for easily assembling a secondary air control valve and reducing the cost for the assembly.
[0002]
[Prior art]
As a structure on the air cleaner side for providing an air passage from the air cleaner side to the intake passage side or the exhaust passage side of the engine, providing a secondary air control valve in the middle of the air passage, and connecting the secondary air control valve, for example, One described in Japanese Utility Model Laid-Open No. 60-87325, “Secondary Air Control Device for Internal Combustion Engine” is known.
[0003]
FIG. 2 of the above publication will be described below as FIG. 8 and FIG. 4 of the above publication will be described again as FIG. 9 below. In addition, the code | symbol was reassigned.
FIG. 8 is a sectional view of a conventional secondary air control valve. An air-fuel mixture adjusting valve 100 as a secondary air control valve is provided with a flange 102 on the third chamber 101 side for introducing secondary air. Is attached to a volume case 104 provided on the air cleaner side by fixtures 103, 103 such as bolts. Reference numeral 105 denotes a secondary air passage communicating with the intake passage of the engine, and reference numeral 106 denotes a negative pressure passage.
[0004]
FIG. 9 is a cross-sectional view of another conventional secondary air control valve. An air-fuel mixture adjusting valve 110 as a secondary air control valve is provided with a secondary air inlet 111 extending from the third chamber 101 side. One end of an introduction pipe 112 such as a rubber hose is connected to the introduction port 111, and the other end of the introduction pipe 112 is connected to a secondary air discharge pipe 113 projecting from the volume case 104. Here, a volume case 104 and a secondary air discharge pipe 113 are added to FIG. 4 of the above publication.
[0005]
[Problems to be solved by the invention]
In FIG. 8, since the air-fuel mixture adjusting valve 100 is attached to the volume case 104 on the air cleaner side by a plurality of fixing means 103, 103 such as bolts, it takes a lot of time to assemble the air-fuel mixture adjusting valve 100. Since the secondary air passage 105 and the negative pressure passage 106 protrude sideways, it is difficult to use a tool when screwing the fixture 103, and assembly is not easy.
[0006]
In FIG. 9, the inlet 111 of the air-fuel mixture adjusting valve 110 and the discharge pipe 113 on the volume case 104 side are connected by an inlet pipe 112 such as a rubber hose. In some cases, the inlet pipe 112 is connected to the inlet 111 side and the outlet pipe. Since it is necessary to stop so as not to come off with a clip on the 113 side, the number of parts increases to connect the air-fuel mixture adjusting valve 110 to the air cleaner side, and the cost for assembly increases.
[0007]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to make it possible to easily assemble a secondary air control valve in an air cleaner structure of a vehicle, and to reduce the cost for assembling.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an air cleaner is provided at a rear portion of a power unit including an engine, the air cleaner and an exhaust passage of the engine are connected by a secondary air supply path, and the secondary air is connected to the secondary air supply path. Insertion part for directly inserting the air inlet of the secondary air control valve into the air cleaner in a vehicle in which the amount of air supplied from the air cleaner to the engine exhaust passage is controlled by interposing the control valve And a case support portion for supporting the case of the secondary air control valve, the insertion portion is directed in the vehicle width direction, the case support portion is directed in the vehicle body longitudinal direction , and the secondary air control valve is supported from the vehicle longitudinal direction. by assembling the parts, the case of the insertion portion and the case supporting portion the secondary air control valve so as to support from two directions, the secondary air control valve, et al provided in the air cleaner The air cleaner is placed around the front side of the intake passage connection hole and communicates with the intake passage connection hole and the main air cleaner chamber where the main air filter element is provided, and the air intake port of the secondary air control valve via the insertion section. The air passage is divided into a secondary air cleaner chamber provided with a secondary air filter element, and an intake passage connecting hole is disposed closer to the secondary air cleaner chamber.
[0009]
Conventionally, the secondary air control valve is fixed to the air cleaner with a bolt or the like. Compared to this, the present invention provides the air cleaner with the insertion portion, so that the secondary air control valve can be easily supported by the insertion portion and the case support portion. Therefore, the secondary air control valve can be easily attached to the air cleaner. Can be assembled to. Further, the number of parts for connecting the secondary air control valve to the air cleaner can be reduced, and the cost for assembling the secondary air control valve can be reduced.
[0010]
According to a second aspect of the present invention, the air cleaner is provided with a sub air cleaner chamber for supplying air to the secondary air control valve side, in addition to the main air cleaner chamber for supplying air to the intake passage of the engine.
[0011]
By providing the secondary air cleaner chamber in the air cleaner, the secondary air control valve side is not affected by the pressure pulsation on the main air cleaner chamber side, so supply sufficient air to the secondary air control valve side. The unburned gas in the exhaust passage can be oxidized satisfactorily.
[0012]
According to a third aspect of the present invention, a rear wheel is attached to the rear end of the power unit.
Even if the power unit vibrates as the rear wheel moves up and down, the case of the secondary air control valve is supported by the insertion part and the case support part from two directions, so that it is supported more reliably than it is supported from one direction. Can do.
[0013]
According to a fourth aspect of the present invention, a muffler is disposed on the rear side of the rear wheel.
Ru can be moved away the secondary air control valve from the muffler generates heat.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a vehicle adopting an air cleaner structure according to the present invention. A scooter type vehicle 10 as a vehicle has a power unit 13 including an engine 11 and a power transmission device 12 arranged at a lower rear portion. An air cleaner 14 is provided at the upper rear portion, and a muffler 16 is disposed on the back side of the rear wheel 15 attached to the power unit 13.
Here, 18 is an intake passage, 21 is a carburetor provided in the middle of the intake passage 18, and 22 is an exhaust pipe from the engine 11 to the muffler 16.
[0015]
FIG. 2 is a system diagram of an intake system and a secondary air supply system according to the present invention. An intake passage 18 is connected to the air cleaner 14, and an end of the intake passage 18 is connected to a cylinder head 24 of the engine 11. An exhaust pipe 22 is extended from the head 24, a muffler 16 is attached to the rear end of the exhaust pipe 22, a secondary air control valve 25 is connected to the air cleaner 14, and a lead provided on the cylinder head 24 from the secondary air control valve 25. It shows that a secondary air supply pipe 27 as a secondary air supply path is extended to the valve 26 and a negative pressure introduction pipe 28 is extended from the secondary air control valve 25 to the intake passage 18 on the engine side from the carburetor 21. Reference numeral 31 denotes an air inlet of the air cleaner 14.
[0016]
The secondary air control valve 25 opens and closes with a negative pressure obtained from the inside of the intake passage 18 via the negative pressure introduction pipe 28. When the secondary air control valve 25 opens, the secondary air control valve 25 is sucked from the suction port 31 of the air cleaner 14 as indicated by the arrow and filtered. Is supplied into the exhaust passage 32 provided in the cylinder head 24 via the secondary air supply pipe 27 and the reed valve 26, and when closed, the supply of air into the exhaust passage 32 is stopped. The air supplied into the exhaust passage 32 oxidizes and purifies unburned gas, particularly HC (hydrocarbon) and NO _x (nitrogen oxide) in the exhaust passage 32, the exhaust pipe 22 and the muffler 16, and externally. Discharge.
[0017]
FIG. 3 is a plan view of an air cleaner and a secondary air control valve according to the present invention. The air cleaner 14 includes an air cleaner body 33, a cover 34 covering the opening of the air cleaner body 33, and an air filter element (not shown). The air cleaner body 33 is provided with an air discharge pipe 36 for connecting a secondary air inlet 35 as an air inlet of the secondary air control valve 25, and the case of the secondary air control valve 25 is attached to the air cleaner body 33. A case supporting portion 38 for supporting 37 is integrally formed.
[0018]
The air discharge pipe 36 includes an insertion hole 36a as an insertion portion for discharging air from the air cleaner 14 into the secondary air control valve 25 and inserting the secondary air suction port 35 therein.
The air discharge pipe 36 may be formed of a rubber material and may be thin to enhance flexibility.
[0019]
Here, 39 is an intake passage connection hole provided in the air cleaner body 33 for connecting the intake passage 18 (see FIG. 2), 41 is a support piece provided at the tip of the case support portion 38, and 42 is from the air discharge pipe 36. This is a clip that prevents the secondary air inlet 35 of the secondary air control valve 25 from coming off.
[0020]
4 is a view taken in the direction of the arrow 4 in FIG. 3. The secondary air control valve 25 includes coupling portions 43 and 43 coupled to the case support portion 38 (see FIG. 3) of the air cleaner 14 (see FIG. 3). Formed.
The coupling portion 43 has a cutout portion 45 for fixing the rubber member 44.
The rubber member 44 has a rectangular support piece insertion hole 46 into which the support piece 41 (see FIG. 3) of the case support portion 38 is inserted.
[0021]
In this embodiment, one coupling portion 43 (the lower coupling portion 43 in the figure) is used. For example, the secondary air control valve 25 is attached to an air cleaner having a different shape or an air cleaner of another vehicle type. In this case, the other coupling portion 43 (the upper coupling portion 43 in the figure) is used. In this manner, the position of the coupling portion 43 can be selected according to the layout of components around the air cleaner depending on the shape of the air cleaner and the vehicle type.
[0022]
FIG. 5 is a cross-sectional view of the secondary air control valve according to the present invention. The secondary air control valve 25 is provided on the suction portion 51 provided with the secondary air suction port 35 and on the cylinder head 24 (see FIG. 2) side. A discharge portion 53 provided with a secondary air discharge port 52 that communicates with a negative pressure operating portion 55 provided with a negative pressure intake port 54 that takes in negative pressure from the intake passage 18 (see FIG. 2) is assembled and stacked. 56, the diaphragm chamber 57 is separated into the first chamber 58 and the second chamber 61, the rod 62 is attached to the diaphragm 56, the rod 62 is inserted into the rod guide hole 63 provided in the discharge portion 53, and the tip of the rod 62 is A valve body 64 and a spring receiving member 65 are attached to the portion, the spring receiving member 65 is pressed by a coil spring 66 in a direction in which the valve body 64 is opened, and the rubber member 44 is fitted to the coupling portion 43. In addition, 67 is a valve seat part, 68 is a communicating hole which connects the 2nd chamber 61 and the inside of the secondary air discharge port 52. As shown in FIG.
The suction part 51, the discharge part 53, and the negative pressure operation part 55 described above constitute the case 37 described above.
[0023]
When the negative pressure acting on the first chamber 58 of the diaphragm chamber 57 is less than a predetermined value, the valve body 64 is located away from the valve seat 67 by the elastic force of the coil spring 66, and the secondary air control valve 25 is in an open state, and air flows from the secondary air suction port 35 to the secondary air discharge port 52.
[0024]
Further, when the negative pressure acting on the first chamber 58 is equal to or greater than a predetermined value, the differential pressure between the first chamber 58 and the second chamber 61 becomes large, and the diaphragm 56 bends to the left and passes through the rod 62. Then, the valve body 64 moves to the left in the figure against the elastic force of the coil spring 66 and is seated on the valve seat 67, whereby the secondary air control valve 25 is closed. Thereby, the flow of air from the secondary air suction port 35 to the secondary air discharge port 52 is stopped.
[0025]
The procedure for assembling the secondary air control valve 25 to the air cleaner 14 described above will now be described.
FIGS. 6A to 6C are operation diagrams for explaining the operation of the air cleaner structure according to the present invention.
In (a), first, the rubber member 44 of the coupling portion 43 of the secondary air control valve 25 is assembled to the support piece 41 of the case support portion 38 of the air cleaner 14 as indicated by an arrow.
[0026]
In (b), the secondary air inlet 35 of the secondary air control valve 25 is inserted into the air discharge pipe 36 of the air cleaner 14 as shown by the arrow.
In (c), the clip 42 fitted to the base of the air discharge pipe 36 of the air cleaner 14 is moved to the distal end side of the air discharge pipe 36 to prevent the secondary air intake port 35 of the secondary air control valve 25 from coming off. Plan.
Thus, the assembly of the secondary air control valve 25 to the air cleaner 14 is completed.
[0027]
As described above with reference to FIGS. 2 and 3, the present invention connects the air cleaner 14 and the exhaust passage 32 of the engine 11 with the secondary air supply pipe 27 and connects the secondary air supply pipe 27 to the secondary air control valve. In the scooter type vehicle 10 in which the amount of air supplied from the air cleaner 14 to the exhaust passage 32 of the engine 11 is controlled by interposing the air cleaner 25, the secondary air intake of the secondary air control valve 25 is introduced into the air cleaner 14. An air discharge pipe 36 having an insertion hole 36a for directly inserting the port 35 is provided to support the case 37 of the secondary air control valve 25.
[0028]
Conventionally, the secondary air control valve 25 is fixed to the air cleaner 14 with bolts or the like. In contrast, according to the present invention, by providing the air cleaner 14 with the air discharge pipe 36 having the insertion hole 36a, the secondary air control valve 25 can be easily supported by the insertion hole 36a, that is, the air discharge pipe 36. The secondary air control valve 25 can be easily assembled to the air cleaner 14. Moreover, the components for connecting the secondary air control valve 25 to the air cleaner 14 can be reduced, and the cost for assembling the secondary air control valve 25 can be reduced.
[0029]
FIG. 7 is a plan view showing another embodiment of the air cleaner structure according to the present invention. The same components as those in the embodiment shown in FIG.
The air cleaner 70 includes an air cleaner main body 71 and a cover 72 that covers the opening of the air cleaner main body 71, and a space formed by the air cleaner main body 71 and the cover 72 is formed by a first partition 73 and a main air cleaner chamber 74 and a sub air cleaner chamber. 75, the main air cleaner chamber 74 is separated into a main dirty side 77 and a main clean side 78 by the second partition wall 76, and an opening 81 is provided in the second partition wall 76. The main air filter element is provided in the opening 81. 82, and by setting up the standing wall 83 from the side wall 71a of the air cleaner body 71 in the sub air cleaner chamber 75, the air cleaner body 71 side of the sub air cleaner chamber 75 is separated into the first sub chamber 75a and the second sub chamber 75b. By arranging the sub air filter element 84 in the middle part in the second sub chamber 75b, the sub air cleaner chamber 7 is arranged. Is separated into a sub-dirty side 85 and a sub-clean side 86, which combine the spaces on the cover 72 side of the first sub-chamber 75a and the sub-air cleaner chamber 75, and air is taken into the sub-dirty side 85 on the side wall 71a. 87 is provided, and the intake pipe 87 is connected to an air intake tube 88 having a tip disposed in a gap in a vehicle body frame (not shown). Note that the suction port 31 (see also FIG. 2) communicates with the main dirty side 77 from the outside.
[0030]
The first partition 73 includes a body wall 73a on the air cleaner body 71 side and a cover wall 73b on the cover 72 side. 71c and 71c are support pieces extending from the side wall 71a to the cover 72 side, and 72c and 72c are support pieces extending from the cover 72 to the air cleaner main body 71 side, and the support pieces 71c and 71c and the support pieces 72c and 72c are The auxiliary air filter element 84 is fixed by sandwiching the auxiliary air filter element 84. 91 is a seal member interposed between the main body wall 73a and the cover wall 73b.
[0031]
The air taken in from the air intake tube 88 enters the sub-dirty side 85 from the suction pipe 87 and flows as indicated by the arrow “circle number 1”, and passes through the sub-air filter element 84 as indicated by the arrow “circle number 2”. And flows into the sub clean side 86. Then, the air in the auxiliary clean side 86 flows into the secondary air control valve 25.
[0032]
As described above, the present invention is different from the main air cleaner chamber 74 that supplies the air cleaner 70 with air to the intake passage 18 (see FIG. 2) of the engine 11 (see FIG. 2). A sub air cleaner chamber 75 for supplying air to the air is provided.
[0033]
By providing the sub air cleaner chamber 75 in the air cleaner 14, the secondary air control valve 25 side is not affected by the pressure pulsation on the main air cleaner chamber 74 side. Air can be supplied to satisfactorily oxidize the unburned gas in the exhaust passage 32. Therefore, the exhaust gas purification performance can be maintained.
[0034]
In the present invention, the insertion portion and the case support portion are integrally formed with the air cleaner. However, the present invention is not limited to this, and a part of the secondary air control valve (the suction portion 51 and the discharge portion 53 shown in FIG. 5) is not limited to this. May be integrally formed, or a secondary air control valve may be incorporated in the air cleaner.
[0035]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
The vehicle air cleaner structure according to claim 1 is provided with an insertion portion for directly inserting an air suction port of the secondary air control valve and a case support portion for supporting the case of the secondary air control valve. Direct air control at the insertion part and the case support part by attaching the secondary air control valve to the case support part from the front and rear direction of the car body with the head part facing the vehicle width direction, the case support part facing the car body front and rear direction The valve case is supported from two directions, the secondary air control valve is arranged around the front side of the intake passage connection hole provided in the air cleaner, the air cleaner is led to the intake passage connection hole, and the main air filter element is provided. The main air cleaner chamber is divided into an air suction port of the secondary air control valve through the insertion portion and a sub air cleaner chamber provided with a sub air filter element. Placing the road connecting hole in the sub air cleaner chamber closer. Conventionally, the secondary air control valve is fixed to the air cleaner with a bolt or the like. In contrast, according to the first aspect, the secondary air control valve can be easily supported by the insertion portion as described above, and the secondary air control valve can be easily assembled to the air cleaner. Further, the number of parts for connecting the secondary air control valve to the air cleaner can be reduced, and the cost for assembling the secondary air control valve can be reduced.
[0036]
In the vehicle air cleaner structure according to the second aspect of the present invention, the secondary air cleaner chamber for supplying air to the secondary air control valve side is provided in the air cleaner separately from the main air cleaner chamber for supplying air to the intake passage of the engine. Since the air control valve side is not affected by the pressure pulsation on the main air cleaner chamber side, supply sufficient air to the secondary air control valve side to improve the oxidation of unburned gas in the exhaust passage. It can be carried out. Therefore, the exhaust gas purification performance can be maintained.
[0037]
In the vehicle air cleaner structure according to the third aspect, the rear wheel is attached to the rear end of the power unit. Therefore, even if the power unit vibrates as the rear wheel moves up and down, the case of the secondary air control valve is inserted and supported by the case. Since it supports from two directions by a part, it can support more reliably compared with supporting from one direction.
[0038]
An air cleaner structure for a vehicle according to claim 4, since the muffler is disposed on the rear side of the rear wheel, Ru can be moved away a secondary air control valve from the muffler they generate heat.
[Brief description of the drawings]
FIG. 1 is a side view of a vehicle employing an air cleaner structure according to the present invention. FIG. 2 is a system diagram of an intake system and a secondary air supply system according to the present invention. FIG. 3 is an air cleaner and secondary air control according to the present invention. Fig. 4 is a plan view of the valve. Fig. 4 is a view taken in the direction of the arrow 4 in Fig. 3. Fig. 5 is a sectional view of a secondary air control valve according to the present invention. 7] A plan view showing another embodiment of the air cleaner structure according to the present invention. [FIG. 8] A sectional view of a conventional secondary air control valve. [FIG. 9] A sectional view of another conventional secondary air control valve. Explanation of]
DESCRIPTION OF SYMBOLS 10 ... Vehicle (scooter type vehicle), 11 ... Engine, 13 ... Power unit, 14, 70 ... Air cleaner, 15 ... Rear wheel, 16 ... Muffler, 18 ... Intake passage, 25 ... Secondary air control valve, 27 ... Secondary air Supply path (secondary air supply pipe), 32 ... exhaust passage, 35 ... air suction port (secondary air suction port), 36a ... insertion part (insertion hole), 37 ... case, 38 ... case support part, 39 ... intake air Passage connection hole, 74 ... main air cleaner chamber, 75 ... sub air cleaner chamber , 82 ... main air filter element, 84 ... sub air filter element .

Claims (4)

By providing an air cleaner at the rear of the power unit including the engine, connecting the air cleaner and the exhaust passage of the engine with a secondary air supply path, and providing a secondary air control valve in the secondary air supply path, In a vehicle that controls the amount of air supplied to the exhaust passage of the engine,
The air cleaner is provided with an insertion portion for directly inserting the air inlet of the secondary air control valve and a case support portion for supporting the case of the secondary air control valve, and the insertion portion is arranged in the vehicle width direction. The case support portion is directed in the longitudinal direction of the vehicle body, and the secondary air control valve is assembled to the case support portion from the longitudinal direction of the vehicle body. Is supported from two directions,
The secondary air control valve is disposed around the front side of an intake passage connection hole provided in the air cleaner,
The air cleaner communicates with the intake passage connection hole and is provided with a main air cleaner chamber in which a main air filter element is provided, and an air intake port of the secondary air control valve via the insertion portion and a sub air filter element is provided. An air cleaner structure for a vehicle, wherein the air passage structure is partitioned into a sub air cleaner chamber, and the intake passage connection hole is disposed closer to the sub air cleaner chamber.   2. The vehicle according to claim 1, wherein the air cleaner is provided with a sub air cleaner chamber for supplying air to the secondary air control valve side, in addition to a main air cleaner chamber for supplying air to an intake passage of the engine. Air cleaner structure.   The vehicle air cleaner structure according to claim 1, wherein a rear wheel is attached to a rear end of the power unit.   4. The vehicle air cleaner structure according to claim 3, wherein a muffler is disposed on the rear side of the rear wheel.

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