Title of Invention

EXHAUST EMISSION CONTROL DEVICE

Abstract

An exhaust emission control device for motorcycles which introduces exhaust gases through an exhaust pipe (10) connected to an engine (8) mounted; at about the center of a vehicle body, with one end of a secondary air passage for supplying the secondary air for cleaning the exhaust gases connected to said exhaust pipe and with the other end of said secondary air passage connected to an air cleaner for secondary air (22) through a valve; said exhaust emission control device, characterized in that said air cleaner for secondary air (22) is mounted on one side of said engine and said valve is mounted on the other side of said engine; that is, said air cleaner for secondary air (22) and said valve are mounted separately on both right and left sides of said engine.

Full Text

FORM 2 THE PATENTS ACT 1970 [39 OF 1970] COMPLETE SPECIFICATION [See Section 10] "EXHAUST EMISSION CONTROL DEVICE" HONDA GIKEN KOGYO KABUSHIKI KAISHA, a corporation of Japan, having a place of business at 1-1, Minamiaoyama 2-chome, Minato-ku, Tokyo, Japan, The following specification particularly describes; the nature of the invention and the manner in which it is to be performed:- GRANTED 27/12/2004 [DETAILED DESCRIPTION OF THE INVENTION] [Industrial Field of Utilization] The present invention relates to an exhaust emission control device for a motorcycle in which a secondary air is introduced into an exhaust system fitted with a catalyst for the purpose of catalyst activation and, more particularly, to an advantageous structure of arrangement of the same. [Prior Art] This type of exhaust emission control device is a known art; for example, an exhaust emission control device disclosed in Japanese Patent Laid-Open No. H6-330740 is mounted vertically on one side of the engine, in which the secondary air is supplied from an engine intake air cleaner through a valve. Also known is a similar exhaust emission control device using no air cleaner which has been disclosed in Japanese Utility Model No. 2581292. In the present invention, the directions "upper and lower" and "right and left" of components are orientations in which the components are attached on the vehicle body. [Problem to Be Solved by the Invention] In the exhaust emission control device, it is desired that pre-cleaned! air be taken in as the secondary air from the air cleaner. However, if the engine intake air cleaner is used as disclosed iri Japanese Patent Laid-Open No . H6-330740, there will arise such a; problem that a decreased quantity of engine intake air will result It is, therefore, preferable to mount a special air cleaner for secondary air to be supplied separately from the engine intake air. Therefore, it is considered to arrange the air cleaner for secondary air specially configured as previously stated and the valve on one side of the cylinder section. According to such arrangement, however, the air cleaner and the valve are forced to be mounted in a very narrow space or are hard to install, resulting in a substantially low degree of flexibility in arrangement land lowered maintainability. In view of the above described problems, therefore, it is a primary object of the invention to provide an exhaust emission control device capable of resolving the above described problems, decreasing the component count, facilitating mounting, and reducing noise. [Means for Solving the Problem] A first aspect of the exhaust emission control device is characterized in that an engine is located nearly at the center of the vehiclje body; exhaust gases are introduced to a catalyst through an exhaust pipe connected to the engine; the secondary air passage is connected at one end to the exhaust pipe to supply the secondary air for cleaning the exhaust gases and at the other end to the air cleaner for secondary air through the valve. In this exhaust emission control device, the air cleaner for secondary air is mounted on one side of the engine and the valve is mounted on the other side of the engine. That is, the air cleaner for secondary air and the valve are separately mounted on both the right and left sides of the engine. A second aspect is characterized in that, in the first aspect stated above, the valve is covered with a boot made of i an elastic material; the boot being supported on a valve stay mounted on the engine. A third aspect is characterized in that, in the second ' aspect described above, the valve stay serves also as a supporting member for supporting the lower part of a radiator mounted in the front of the engine. A fourth aspect is characterized in that, in the first aspect described above, the air cleaner for secondary air is provided with a water-prevention wall which covers the front of the outside air inlet of the air cleaner. A fifth aspect is characterized in that, in the first aspect described above, there is provided an air cleaner stay to support tine air cleaner for secondary air on the engine, and the air cleaner stay is fastened together with its components to the engine. r[Effect of [the Invention] According to the first aspect, the air cleaner for secondary air and the valve are separately mounted on the right and left sides of the engine, either being supported on the engine. Therefore, the air cleaner and valve thus mounted have a relatively high degree of freedom and high maintainability notwithstanding the limited mounting space on the side surface of the engine. According to the second aspect, the valve is covered with a boot made of an elastic material, which reduces an operating sound of thejvalve and besides the valve can easily be supported by supporting the boot on the valve stay attached on the engine. According tp the third aspect, since the valve stay serves also as a supporting member which supports the lower part of the radiator mounted in the front of the engine, it is possible to reduce the component count and to facilitate mounting of the exhaust emission control device. According to the fourth aspect, since the air cleaner for Isecondary air is provided with the water-prevention wall covering the front of the outside air inlet thereof, entry of ' ' rain water into the air cleaner for secondary air can be prevented by the wall during driving in rain, making it easy to drive under such an adverse operating condition. According to the fifth aspect, the air cleaner stay for supporting the air cleaner for secondary air is fastened together with its components to the engine. It is, therefore, possible to decrease the component count and to facilitate mounting of the device. Accordingly!, the present invention relates to an exhaust emission control device for motorcycles which introduces exhaust gases through an exhaust pipe connected to an engine mounted at about the center of a vehicle body, with one end of a secondary air passage for supplying the secondary air for cleaning the exhaust gases connected to said exhaust pipe and with the other end of said secondary air passage connected to an air cleaner for secondary air through a valve; said exhaust emission control device, characterized in that said air cleaner for secondary air is mounted on one side of said engine and said valve is mounted on the other side of said engine; that is, said air cleaner for secondary air and said valve are mounted separately on both right and left sides of said engine. [BRIEF DESCRIPTION OF THE/DRAWINGS] Fig. l is a front view of the present embodiment of an exhaust emission control device mounted on a vehicle body; Fig. 2 is a side view of a motorcycle to which the present embodiment is applied; Fig. 3 is a: view showing the arrangement of the exhaust emission control . device on the front side of an engine; Fig. 4 is a sectional view, partly cut out, of an air v cleaner for secondary air; Fig. 5 is a perspective if the air cleaner stay; Fig. 6 is a plan view of the air cleaner stay and air cleaner for secondary air; Fig. 7 includes plan and side views of a valve stay; Fig. 8 includes plan, side and front views of a boot; and Fig. 9|includes plan, side and front views of a lower boot. [Preferred Embodiments of the Invention] One preferred embodiment of the invention applied to motorcycles will be described with reference to the accompanying drawings. Fig. 1 shows the layout of an exhaust emission control device of the present embodiment as viewed from the front of the vehicle body, Fig. 2 is a side view of a motorcycle to which the present embodiment is applied; Fig. 3 shows the layout of the exhaust emission control device on the front side surface of the engine; Fig. 4 is a sectional view, partly cut out, of the air cleaner for secondary air; Fig. 5 is a perspective view of the air cleaner stay; Fig. 6 is a top view of the air cleaner for secondary air with the air cleaner stay attached; Fig. 7 includes plan and side views of the valve stay; Fig. 8 includes plan, side and front views of an upper boot; and Fig. 9 includes plan, side and front views of a lower boot. First, Fig. 2 shows the motorcycle in which a front fork . 2 supporting a front wheel 1 is rotatably supported at the upper part to the front end of the vehicle frame 3. The vehicle frame 3 is arranged in the longitudinal direction of the vehicle body, and on its rear side a swing arm 4 is swingably installed at the front end portion. On the rear end portion of the swing arm, a rear wheel 5 is rotatably supported. Supported above the vehicle frame 3 is a fuel tank 6, behind which a seat 7 is. supported. Below the vehicle frame 3 is supported a two-cycle water-cooled engine 8, in front of which a radiator 9, is lpcated and supported on the engine 8. At the front part of the engine 8 an exhaust pipe 10 is connected. The exhaust pipe 10 is routed beneath the engine 8, extending to the rear, connected to a muffler 1.2 through an expansion pipe 11,; thereby cleaning exhaust gases by an unillustrated catalyst mounted in the exhaust line. The engine 8,as shown in Fig. 3, has a water pump 14 located in the front lower part of a crankcase 13, and a forward inclined cylinder head 15 and a cylinder head cover 16 covering the top section thereof mounted on the crankcase 13. The cylinder head cover 16 is mounted on the cylinder head 15 by a stud bolt 17 and a nut 18 protruding upward from the cylinder head 15 side. Furthermore, the engine 8 is provided with an exhaust emission control device. That is, the exhaust emission control device has valve unit 20, upper secondary air passage 21, connecting pipe 21a air cleaner for secondary air 22, lower secondary air line 23, and connecting pipe 23a, introducing the secondary air from the air cleaner for secondary air 22 to the vicinity of an exhaust port 15a in the cylinder head 15. The valve unit 20 uses a known reed valve 24, which is covered with a boot made of an elastic material such as rubber. The boot is a unitized split part comprising an upper boot 25 and a lower boot 26, and is supported on a valve support portion 28 of a valv|e stay 27 which is Y-shaped as viewed from side. It should be noticed that the reed valve 24 adopted is one example of the valve and other types of valves also may be used. The valve stay 27 is installed by attaching the lower end of a mounting leg 29 protruding downward and the valve support portion 28 by a bolt 30 to the side surface of the crankcase 13 ; and the lower part of the radiator 9 is supported by inserting, into a radiator support portion 31, a pin 33 projecting downward from the lower tank 32 of the radiator 9. In the drawings, reference numeral 34 denotes a water feed hose connected between a joint pipe 32a installed to the lower tank 32 of the radiator 9 and the water pump 14 of the engine 8; and reference numeral 35 denotes is a rearward projecting stay installed at a midpoint portion in the vertical direction on both the right and left sides of the radiator 9, and attached on the cylinder head cover 16. Next, the exhaust emission control device will be explained in [detail. As is clear from Fig. 1, the valve unit 20 and the air cleaner for secondary air 22 are separately mounted on both the right and left sides of the cylinder head previously roughly stated. In the present embodiment, the valve unit 20p is located on the left side surface of the cylinder head 15, and the second air cleaner 22 is separately mounted on the right side of either of the cylinder head 15 and the cylinder head cover 16. The valve unit 22 and the air cleaner for secondary air 22 are supported on the cylinder head 15 or on both the cylinder head 15 and the cylinder head cover 16, and furthermore are . mutually connected by the connecting pipe 21a installed laterally behind; the cylinder head cover 16 and above the cylinder head 15, and by the upper secondary air passage 21 connected to the connecting pipe 21a. The upper secondary air passage 21, the valve unit 20, and the lower secondary air passage 23 are connected in order of mention, being; arranged downward across on the left side surface of the cylinder head 15; and the lower part of the lower secondary air passage 23 is bent and routed around the front of the cylinder head 15, being connected to one: end of the connecting pipe 23a at this point. The other end of the connecting pipe 23a arranged across the exhaust pipe 10 goes to the right side of the vehicle body, then is turned back to be connected to the right side of the exhaust pipe' 10, being unitized by welding or other. The front portion of the exhaust pipe 10 rises upward nearly along the center of vehicle body, and is attached to the exhaust port 15a (Fig. 3) of the cylinder head 15 by a connecting flange formed on the forward end portion. ' The air cleaner for secondary air 22 is a special device configured separately from an intake air cleaner not shown of the engine 8, and' is a split type dividable into'an upper case 40 and a lower case 41 as shown in Fig. 4. These members are assembled into one unit by tightening mounting lugs 40a and 41a and a screw 43 with an air filter 42 inserted in the:joint section of the two members. In the vicinity of the mounting lug 41a of the lower case 41, a separate mounting lug 44 on the stay side is provided in one unit, being fastened to an air cleaner stay described later. Numeral 44a jrefers to a through hole, and 44b denotes a collar fitted in the hole 44a. The interior of the air cleaner for secondary air 22 is separated into two rooms by the air filter 42: a clean room 45 and a dirty room 47. The clean room 45 is located above the air filter 42. From the clean room 45, clean secondary air flows through a joint pipe 46 formed unitarily and projecting on the side of the upper-case 40, being sent out into the reed valve 24 through the connecting pipe 21a connected to the joint pipe 46 and then through the upper secondary air passage 21 located after the connecting pipe 21a (Fig. 1). The dirty room 47 is located under the air filter 42. At the bottom (section of the lower case 41, an intake duct 48 is formed unitarily,, projecting downward. An opening formed in the forward end of the intake duct 48 is an outside air intake port. Around the intake duct 48, a first tubular water-prevejntion wall 49 arranged, with a spacing, provided, for covering the intake port is formed unitarily with the bottom of the lower case,41, extending longer downward than the intake duct 48. Furthermore, in the forward portion of the intake duct 48 mounted oh the vehicle body, the second water-prevention wall 50 is formed, with the front side wall of the lower case 41 extended, protruding downward from the bottom section and extended longer downward than the first water-prevention wall 49, covering, in an approximately semi - circular, form, the forward part of either of the first water-prevention wall 49 and the intake duct 48. On the second water-prevention wall 50 a reinforcing rib 50a (Fig. 1) is unitarily formed. Between the second water-prevention wall 50iand the first water-prevention wall 49, a drain pipe 51 is formed unitarily, projecting downward from the bottom of the lower case 41; and a drain tube 52 mounted on its forward end is extended downward along the ba|ck side of the second water-prevention wall 50. In the! dirty room 47, a brace 53 is formed, projecting upward from the center of the bottom of the lower case 41. An intake air passage 54 is formed vertically, along the brace 53, on the extension of the intake air duct 48 . The upper end portion of the intake air passage 54 is closed with a ceiling section 5 5 jutting out unitarily sideward from the brace 53. The intake air passage 54 communicates with the dirty room 47 at the outlet port 56 which opens sideward in the vicinity thereof; the intake air passage forming a kind of labyrinth passage. The air cleaner for secondary air 22 is supported on the engine 8 by means of the air cleaner stay 57. On the upper and lower end portions of the air cleaner stay 57, as shown in Fig 5, a pair of engine mounting lugs 58, 58 and a pair of air cleaner mounting lugs 59,i, 59 bent in mutually opposite directions are formed at a predetermined spacing, and through holes 58a, 58a and 59a, 59a are provided. At the through holes 59a, 59a of the air cleaner mounting lugs 59, 59, weld nuts 59b, 59b are welded, and both air cleaner mounting lugs 59, 59 are connected by a circular portion 59c which fits on the outer periphery of the air cleaner for secondary air 22. Fig. 6 is a top view of the air cleaner for secondary air 22 with the air cleaner stay 57 attached. To attach the air cleaner for secondary air 22 to the air cleaner stay 57, first its outer periphery is set along the circular portion 59c of the air cleaner stay 57; the mounting lugs are placed on the stay side on the air cleaner mounting lugs 59, 59 to thereby align through holes 44a, 44a with through holes 59a, 59a; and bolts 60, 60 are inserted from above, and then fastened to weld nuts 59b,59b. Furthermore,, to install the air cleaner stay 57, the engine mounting lugs 58, 58 are placed on the cylinder head cover 16; the upper end portions of stud bolts 17, 17 projecting upward through the edge portion of the cylinder cover 16are inserted through holes 58a; 58a, and tightened by nuts 18, 18 on the forward end together with the cylinder head 15 and the cylinder head cover 16, thus supporting the air cleaner for secondary air 22 to the engine 8 side through the air cleaner stay 57. Fig. 7 as a detail view showing the valve stay 27, giving a plan-view configuration in a at (a) and a side-view configuration at (b) . As is clear from these views, the valve stay 27 has a sideward bent portion 61 at the upper end of the valve support portion 28 and a pair of inserting portions 62, 62 formed by bending up both ends of the sideward bent portion 61 parallel to each other. Through holes 64, 64 for bolts 30 (Fig. 3) are provided at the rear portion of the valve support portion 28 and at the ! ■ lower end portion 63 of the mounting leg respectively. Furthermore, the forward end portion of the radiator support portion 31 also forms a sideward bent portion 65, in which an insertion hole 66 is formed for inserting the pin, 33 (Fig. 3) of the radiator 9. Fig. 8 is a detail view of the upper boot 25, giving a plan-view configuration at (a) , a side-view configuration at (b) , and a front-view configuration at (c) . As shown in these views, the upper boot 25 has a ceiling section 25a of approximately square box type in a plan view and is open in the lower part. At about the center of the ceiling section 25a there is provided an insertion hole 70 for inserting one end portion of the upper secondary air passage 21; and slits 71, 71 are formed vertically through the front and rear side walls located on both sides of the insertion hole 70, enabling insertion of the inserting portions 62, 62 (Fig. 7) . In the upper surface of the ceiling section 25a, projections 72 and 73 are unitarily formed, protruding upward at a pair of corners on a diagonal line.. Furthermore, formed is a groove [74 which is extended longitudinally along the vicinity of the left side portion of the ceiling section and goes in downward, with the forward end portion thereof passing the central portion of the projection 73. A band section 75 is unitarily formed simultaneously with the formation of the groove 74, protruding downward. In a position of the band section 75 under the projection 73, a projection 76 is formed unitarily, further, proj ecting downward. The groove 74, passing at the central part of the projection 73, forms a gap portion 77. Furthermore, a stepped portion 78 is formed on the upper part of the side wall, enclosing the entire outside surface of the ceiling section 25a. Fig. 9 is a detail view of the lower boot 26, showing a plan-view configuration at (a), a side-view configuration at (b) , and a f;ront-view configuration at (c) . As shown in these configurations, the lower boot 26 is located oppositely to the upper boot 25 . The bottom section 26a is an approximately square box type in a plan view, and opens upward. An insertion hole 80 is provided at about the center of the bottom section 26a for inserting one end portion of the lower secondary air passage 23. There are provided slits 81, 81, which are formed vertically through in the front and rear side walls located between the insertion ho!le 80, enabling insertion of the inserting portions 62, 62. In the bottom section 26a, projections 82 and 83 are unitarily formed, protruding downward at a pair of corners on a diagonal line. Furthermore, formed is a groove 84 which is extended longitudinally along the vicinity of the left side portion of the bottom section 26a and goes in upward, with the forward end portion thereof passing the central portion of the projection 83. An upward projecting band section 85 is unitarily formed with the formation of the groove 84. In a position of the band section 85 above the projection 83, a projection 86 is unitarily formed, projecting upward. At the central part of the projection 83 where the groove 84 passes, a gap portion 87 is formed. The slits 71, 71 and 81, 81, grooves 74 and 85, and projections 76 and 83 are located in upper and lower corresponding positions. When tihe upper boot 25 and the lower boot 26 are assembled, the upper end portion 88 of the side wall of the lower boot 26 fits in the side wall of the upper boot 25, being engaged at the stepped portion 78. The front and rear slits 71, 71 are aligned with corresponding slits 81, 81, either forming one vertically continuous slit. In this state, the inserting portions 62, 62 (Fig. 7) of the valve stay 27 can be inserted simultaneously into the upper and lower slits 71 and 81. : The band section 85 fits around the reed valve 24 inserted between the upper boot 25 and the lower boot 26. In this state, the band secttion 85 enters the upper boot 25 to fit in the groove 74 and the projection 86 fits in the gap portion 77. The projection 73, therefore, appears as if the gap portion 77 were not present, just like another projection 72. Furthermore, the band section 75 is fitted from below to the groove 84, being wound on the outside of the bottom section 26a of the lower boot 26; and the projection 76 fits in the gap portion 87; therefore the projection 83, together with the projection 76|, appears as if the gap portion 87 were not present just like the projection 82. The grooves 74 and 84 and the band sections 75 and 85: fit each other, being closed. Next, operation of the present embodiment will be explained. First, the reed valve 24 is housed almost hermetically in the boot including the upper boot 25 and the lower boot 26 which were assembled by the aforementioned procedure, and the upper secondary air passage 21 and the lower secondary air passage 23 are connected at each one end. At this time, the reed valve 24 fixed by the band section, 85 is secured so tightly as not to move inside the boot, thus jointing the upper boot 25 and. the lower boot 26 by the band section 75. In i this manneri installing the reed valve 24 in the boot and jointing the upper; boot 25 to the lower boot 26 are accomplished. The sliits 71 and 81 formed in the front and rear side walls of the valve unit, 20 thus assembled mutually vertically communicate, and therefore the inserting portions 62, 62 of the valve stay 27 attached on the left side of the engine 8 are inserted in lithe pair of slits provided in the front and rear side walls, thereby supporting the valve unit 20 easily and quickly to the left side of the cylinder head 15. In the meantime, the air cleaner for secondary air 22 is supported on the right side of the engine 8 through the air cleaner stays 57, and is connected to the connecting pipe 21a laterally behind the cylinder head cover 16 and above the cylinder head 15, thereby connecting the valve unit 20 to the exhaust pipe lO. Furthermore, the other end of the lower secondary air passage 23 is connected to the connecting pipe 23a, thus completing the exhaust emission control device which ] is connected to the exhaust pipe 10 through the valve unit 20 from the air cleaner 22 for secondary air. i!To attach the' air cleaner stay 57 to the engine 8 side, the cylinder head cover 16 is placed on the cylinder head 15 with stud bolts 17, 17 inserted. Then, with the nuts 18, 18 left not tightened, the engine mounting lugs 58, 58 are aligned with the nuts 18, 18 and the stud bolts 17, 17 are inserted into the through holes 58a, 58a. The nuts 18, 18 are installed on the forward ends o'f the stud bolts 17 , 17, and then are tightened together with the! cylinder head cover 16 to the cylinder head 15. The air cleaner for secondary air 22 and the valve unit 20, being separately arranged on the right and left sides of the engine 8 as previously stated and supported on the engine 8 side, can be mounted with a relatively high degree of flexibility of arrangement and high maintainability notwithstanding an extremely limited mounting space on the engine 8 side, particularly on the cylinder head 15 and cylinder head cover 16 sides. i, Because the reed valve 24 is covered with a boot made of an elastic material, valve operating noise can be reduced by this boot. Besides, the reed valve 24 is tightly supported, also decreasing the noise. Furthermore, since the boot is supported by the insertion type valve stay 27 attached on the engine, the reed valve 24 can be easily supported and moreover contact noise resulting from vibrations of the reed valve 24 and the valve stay 27 can be reduced. In addition, ; the boot is a split type including the upper boot 25 and the lower boot 26, which are provided with the band sections 75 and 85. It is, therefore, possible to improve tightness between the reed valve 24 and the boot and between the upper boot 25 and the lower boot 26 by the use of the band sections 7 5; and 85. Furthermore, these band sections 75 and 85 are formed by the provision of the grooves 74 and 84, it is possible to adopt a similar and simple die structure. Furthermore, the lower part of the radiator 9 can be supported easil 'and quickly by inserting the pin 33, which projects from the lower tank 32 of the radiator 9, into the insertion hole 66 provided in the radiator support portion 31 of the valve stay,27. Besides, since the valve stay 27 serves also as the radiator support member, both the valve unit 20 and the radiator 9 can be supported simultaneously by a single part, thereby enabling the use of multifunctional components, decrease in component count, and facilitation of installation. Furthermore the air cleaner for secondary- air 22 is provided witih the first water-prevention wall 49 and the secondary waiter-prevention wall 50 which cover the front part of the intake duct 48. The use of the two -stage water-prevention wall structure prevents entry of water into the air cleaner 22 for secondary air, facilitating driving under such an adverse driving condition as driving in rain. Moreover, outside air ii being drawn in from below through the intake duct 48 goes upward in the intakke air,passage 54, and is diverted at the ceiling section 55, going out sideward from the outlet port 56. Therefore, the intake air passage 54 serves as a kind of labyrinth passage. The adoption of the labyrinth passage that takes in the outside air from below further improves a waterproof performance. Furthermore, the air cleaner stay 57 is tightened together with the cylinder head cover 16, and therefore it is unnecessary to install a special mounting portion of the air cleaner stay 57 to the cylinder head cover 16 and accordingly no special bolt is needed for tightening the air cleaner stay 57, thereby reducing the component count and facilitating installation. [Explanation of Reference Numerals] 8 ... engine; 9 ... radiator; 10 ... exhaust pipe; 15 ... cylinder head; 16 ... cylinder head cover; 17 ... stud bolt; 18 ... nut; 20 ... valve unit; 21 ... upper (secondary air passage; 22 ... air cleaner for secondary air; 23 .. lower secondary air passage; 24... reed valve; 25 ... upper boot; 26 ... lower boot; 27 ... valve stay; 48 ... intake duct; 49 ... First water-prevention wall; 50 ... secondary water-prevention wall; 57 ... air cleaner stay We Claim: 1. An exhaust emission control device for motorcycles which introduces exhaust gases through an exhaust pipe (10) connected to an engine (8) mounted; at about the center of a vehicle body, with one end of a secondary air passage for supplying the secondary air for cleaning the exhaust gases connected to said exhaust pipe and with the other end of said secondary air passage connected to an air cleaner for secondary air (22) through a valve; said exhaust emission control device, characterized in that said air cleaner for secondary air (22) is mounted on one side of said engine and said valve is mounted on the other side of said engine; that is, said air cleaner for secondary air (22) and said valve are mounted separately on both right and left sides of said engine. 2. An exhaust emission control device as claimed in claim 1, wherein said valve is Covered with a boot made of an elastic material, and said boot is supported on a valve stay attached on said engine 3. An exhaust emission control device as claimed in claim 2, wherein said valve stey serves also as a support member for supporting the lower part of a radiator mounted at the front of said engine. 4. An exhaust emission control device as claimed in claim 1, wherein i said air cleaner for secondary air is provided with a water-prevention wall covering the front of an outside air inlet. 5. An exhaust .emission control device as claimed in claim 1, wherein an air cleaner stay is provide for supporting said air cleaner for secondary air to said engine; said air cleaner stay being tightened together with its components to said engine. 6. An exhaust emission control device for motorcycle substantially as herein described with reference to and as illustrated in the foregoing description and the accompanying drawings. Dated this 21st day of September, 2000 [RANJNA MEHTA-DUTT] OF REMFRY & SAGAR ATTORNEY FOR THE APPLICANTS

Documents:

868-mum-2000-cancelled pages(27-12-2004).pdf

868-mum-2000-claims(granted)-(27-12-2004).doc

868-mum-2000-claims(granted)-(27-12-2004).pdf

868-mum-2000-correspondence(14-3-2006).pdf

868-mum-2000-correspondence(ipo)-(19-2-2007).pdf

868-mum-2000-drawing(22-5-2001).pdf

868-mum-2000-form 1(21-9-2000).pdf

868-mum-2000-form 19(15-4-2004).pdf

868-mum-2000-form 2(granted)-(27-12-2004).doc

868-mum-2000-form 2(granted)-(27-12-2004).pdf

868-mum-2000-form 3(9-3-2001).pdf

868-mum-2000-form 5(21-9-2000).pdf

868-mum-2000-power of authority(27-12-2004).pdf

868-mum-2000-power of authority(8-3-2001).pdf