JP4395025B2 - Intake device for vehicle engine - Google Patents

Description

  The present invention provides an air cleaner in which a cleaner element for filtering air flowing from the unpurified chamber to the purifying chamber is housed in a cleaner case that is partitioned into an unpurified chamber and a purifying chamber, and from the purifying chamber to the cylinder head. The present invention relates to an intake device for a vehicle engine including a throttle body that controls the amount of air supplied.

An intake device in which an air cleaner is connected to a cylinder head of an engine mounted on a motorcycle via a throttle body is already known from, for example, Patent Document 1 and Patent Document 2.
JP 2001-349242 A JP 2001-271723 A

  In the device disclosed in Patent Document 1, the throttle body is connected to the cleaner case so as to communicate with the purification chamber in the air cleaner, and the intake pipe connected to the throttle body or the downstream end of the throttle body has an intake negative pressure. A sensor is attached, and an intake air temperature sensor is disposed in a cleaner case of the air cleaner. Therefore, in the structure in which the intake negative pressure sensor is exposed to the outside and attached to the intake pipe or the throttle body, it is sometimes necessary to separately take measures such as heat shielding against the heat from the engine.

  The present invention has been made in view of such circumstances, and is a vehicle engine that improves the engine control accuracy by minimizing the influence of heat from the engine and the external environment on the intake negative pressure sensor and the intake air temperature sensor. It is a first object to provide an intake device.

  Moreover, in what was disclosed by the said patent document 1 and the patent document 2, the injector is attached to the intake pipe connected to the throttle body or the downstream end of a throttle body, and the operating noise of the injector is disclosed in the patent document 2 The connector part is covered with a soundproof cover to reduce the operating noise. However, in a multi-cylinder vehicle engine, a soundproof cover is required for each injector for each cylinder.

  The present invention has been made in view of such circumstances, and the intake air of a vehicular engine in which the operation sound of the throttle body and the injector can be sound-insulated with a simple structure without taking individual sound-insulating measures for each injector. A second object is to provide an apparatus.

To achieve the above first object, according to claim 1 invention, the air inside flows for purification chamber from the unpurified chamber in the cleaner case which is partitioned into unpurified chamber and clean room by a partition plate The cleaner case includes an air cleaner that houses a cleaner element to be filtered, a throttle body that controls the amount of air supplied from the purification chamber to the cylinder head, and an intake pipe that connects the throttle body and the cylinder head. An intake device for a vehicle engine in which the throttle body and an air funnel connected to an upstream end of the throttle body are arranged, wherein the throttle body is arranged in the partition plate and the unpurified chamber. The air funnel is accommodated in the unpurified chamber so as to be sandwiched between the intake pipe and the air funnel is formed in the hole of the partition plate. And was directly opened to the purifying chamber tip projects into the cleaning chamber through, it is opposed by injecting fuel into the throttle body through the air funnel at the opening end to the purification chamber of the air funnel obtaining injector, the tip portion of the injector so as to protrude into the purifying chamber attached to the cleaner case, the intake negative pressure sensor arranged in front Symbol in the cleaner case, the intake pipe or the throttle body, It is attached to a portion facing the unpurified chamber so as to detect intake negative pressure in the intake pipe or the throttle body .

  According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, a conducting wire connected to at least one of the intake negative pressure sensor and the intake air temperature sensor passes through a grommet attached to the cleaner case. It is derived outside.

According to a third aspect of the invention, in addition to the configuration of the invention according to claim 1 or 2, wherein the intake air temperature sensor on the inner surface of the cleaner case at a portion facing the cleaning chamber you characterized in that it is attached.

The invention of claim 4, wherein, in addition to the configuration of the invention according to any one of claims 1 to 3, the second injector attached to the intake pipe or the throttle body is accommodated in the unpurified chamber It is characterized by.

According to the first aspect of the present invention, the operation sound of the throttle body is insulated by suppressing the operation sound of the throttle body from leaking out of the cleaner case with a simple structure that only accommodates the throttle body in the cleaner case. Therefore, it is not necessary to separately provide protection means against mud, dust, rainwater, etc., and the capacity of the air cleaner can be increased efficiently. In addition, since the intake negative pressure sensor and intake air temperature sensor are arranged in the cleaner case, the cleaner case can be protected from the influence of heat from the engine and the external environment on the intake negative pressure sensor and intake air temperature sensor as much as possible. The engine control accuracy can be improved by improving the detection accuracy. In addition, the intake negative pressure sensor is attached to the portion of the intake pipe or throttle body facing the unpurified chamber and detects the intake negative pressure in the intake pipe or throttle body, so it can be detected even if it is placed in the unpurified chamber. The accuracy is not reduced.

  According to the second aspect of the present invention, when the lead wire extending from the sensor in the cleaner case is pulled out to the outside, the sealing property between the cleaner case and the outside is easily secured, and dust or the like enters the cleaner case from the outside. You can avoid it.

According to the third aspect of the invention, since the intake air temperature sensor in the purification chamber of the cleaner case is disposed, Ru can be kept high detection accuracy of the intake air temperature sensor.

According to the invention described in claim 4 , since the second injector is also accommodated in the cleaner case (unpurified chamber) , the operation sound of the injector can be blocked by the cleaner case, and the connector portion of the second injector There is no need to take individual sound insulation measures for each injector, compared to those covered with a soundproof cover . In addition, since the capacity of the unpurified chamber becomes relatively large in order to accommodate the throttle body and the second injector, the intake efficiency can be increased.

Embodiments of the present invention will be described below based on reference examples shown in the accompanying drawings and examples of the present invention.

1 and 2 show a first reference example, FIG. 1 is a side view of a motorcycle, and FIG. 2 is an enlarged longitudinal side view of the vicinity of an air cleaner.

  In FIG. 1, a motorcycle body frame FA includes a head pipe 12 that supports a front fork 11 that pivotally supports a front wheel WF, and a pair of left and right main frames 13 that extend rearward and downward from the head pipe 12. ..., a pair of left and right engine hangers 14 welded to the front part of the head pipe 12 and both main frames 13 ... and extending downward from the main frame 13 ..., and a pair of left and right pivots extending downward from the rear part of the main frame 13 ... Plate 15 and a rear frame 16 extending rearward and connected to the rear portions of the main frames 13.

  A multi-cylinder configured in a V shape with a front bank BF and a rear bank BR at the lower part of the engine hangers 14, the intermediate part of the main frame 13, and the upper and lower parts of the pivot plate 15, for example. A 5-cylinder engine body 17 is supported.

  A front end portion of a swing arm 18 is swingably supported via a support shaft 19 at an intermediate portion in the vertical direction of the pivot plates 15. The axle of the rear wheel WR is supported on the rear end portion of the swing arm 18. 20 is rotatably supported.

  The power from the output shaft 21 of the transmission built in the engine body 17 is transmitted to the rear wheel WR via the chain transmission means 22, and the chain transmission means 22 is fixed to the output shaft 20. Drive sprocket 23, driven sprocket 24 fixed to the rear wheel WR, and endless chain 25 wound around the sprockets 23, 24.

  An upper end portion of a rear cushion unit 26 is connected to the front portion of the swing arm 18, and a lower end portion of the rear cushion unit 26 is connected to lower portions of the pivot plates 15 through a link mechanism 27. The

  An air cleaner 29A is disposed above the cylinder heads 28F, 28R in the front part of the engine body 17 and the rear banks BF, BR, and a fuel tank 30 covering the engine body 17 from above is provided behind the air cleaner 29A. 16 is supported. A main seat 31 for seating a rider is supported on the rear frame 16 behind the fuel tank 30, and a pillion seat 32 for carrying a passenger is rearwardly separated from the main seat 31. 16 is supported.

  The first individual exhaust pipes 33F connected to the cylinder head 28F of the front bank BF for each cylinder extend below the engine body 17 to the rear wheel WR side, and the first individual exhaust pipes 33F. Commonly connected to the exhaust pipe 34F. The rear frame 16 supports a first exhaust muffler 35F disposed on the upper right side of the rear wheel WR, and the downstream end of the first collective exhaust pipe 34F is connected to the first exhaust muffler 35F. The second individual exhaust pipes 33R connected to the cylinder head 28R of the rear bank BR for each cylinder extend rearward through the upper portion of the rear cushion unit 26, and the second individual exhaust pipes 33R ... are second collective exhaust. Commonly connected to the pipe 34R. A second exhaust muffler 35R supported by the rear frame 16 is disposed below the pillion seat 32, and a downstream end of the second collective exhaust pipe 34R is connected to the second exhaust muffler 35R.

  By the way, the front of the head pipe 12 is covered with a front cowl 36 made of synthetic resin, and both sides of the front part of the vehicle body are covered with a synthetic resin center cowl 37 connected to the front cowl 36, and a part of the engine body 17 and Synthetic resin lower cowl 38, which covers the first individual exhaust pipes 33F connected to the cylinder head 28F of the front bank BF from both sides, is connected to the center cowl 37. Further, the rear portion of the rear frame 16 is covered with a rear cowl 39 together with most of the second exhaust muffler 35R, the fuel tank 30 and the air cleaner 29A are covered with a cover 40, and a front fender 41 covering the upper portion of the front wheel WF is attached to the front fork 11. Mounted.

  In FIG. 2, the upper side walls of the cylinder heads 28F and 28R in both banks BF and BR of the engine body 17 extend linearly so as to guide the purified air from the air cleaner 29A above the cylinder heads 28F and 28R. An intake passage 45 is connected to each cylinder.

  The intake passage portion 45 has an insulator 46 connected to the upper side walls of the cylinder heads 28F and 28R, an intake pipe 47 whose downstream end is connected to the insulator 46, and a downstream end connected to the upstream end of the intake pipe 47. The throttle body 48 and an air funnel 49 connected to the upstream end of the throttle body 48 are provided. The intake pipes 47, the throttle bodies 48, and the air funnels 49 are each provided with a cleaner case 50A of the air cleaner 29A. Housed inside.

  The air cleaner 29A is configured such that a cleaner element 53 that filters the air flowing from the unpurified chamber 51A to the purified chamber 52A is accommodated in a cleaner case 50A that is partitioned into an unpurified chamber 51A and a purified chamber 52A. The intake pipe 47, the throttle body 48, and the air funnel 49 of the intake passage portion 45 are accommodated in a purification chamber 52A of the cleaner case 50A.

  In the cleaner case 50A, the first, second, and third case members 54A, 55A, 56A made of synthetic resin are coupled to each other so that the second case member 55A is sandwiched between the first and third case members 54A, 56A. The first and third case members 54A and 56A are formed in a bowl shape having openings facing each other, and the second case member 55A is an opening of the first and third case members 54A and 56A. It is formed in a cylindrical shape so as to connect the ends.

  The first case member 54A is supported by the insulators 46 of the intake passage portions 45, and is ring-shaped interposed between the intake pipes 47 of the intake passage portions 45 and the cylinder heads 28F and 28F. The first case member 54A is supported by each of the insulators 46 ... by sandwiching the insulators 46 ... between the cylinder heads 28F, 28R and fastening the intake pipes 47 ... to the cylinder heads 28F, 28R.

  A support frame 71A of the cleaner element 53 is attached between the first case member 54A and the second and third case members 55A and 56A. The cleaner case 50A is not supported by the cleaner element 53 and the support frame 71A. It is divided into a purification chamber 51A and a purification chamber 52A. Accordingly, the first and second case members 54A and 55A are connected to each other, but the third case member 56A is removed and the first and second case members 54A and 55A are attached to the first case member 54A side while the support frame 71A of the cleaner element 53 is attached. The third case member 56A is inserted into the second case members 54A and 55A and the third case member 56A is coupled to the second case member 55A so as to cover the cleaner element 53, thereby forming the cleaner case 50A and the cleaner element 53 as the cleaner. It will be supported by the case 50A.

  Air introduction holes 72 and 73 are provided on both sides of the first and second case members 54A and 55A so as to communicate with the unpurified chamber 51A. Air from the outside is drawn into the purification chamber 51A.

  Each throttle body 48 is provided with a throttle valve 61 for controlling the amount of air guided from the purification chamber 52A of the air cleaner 29A through the air funnel 49, and three throttle bodies 48 are arranged corresponding to the front bank BF. The throttle valve 61 of the throttle body 48 and the throttle valve 61 of the throttle body 48 arranged in correspondence with the rear bank BR are linked and connected to each other, and the arrangement direction of the throttle bodies 48 Are arranged on the outer surface of the throttle body 48 at one end along the line, and throttle drums 63 are connected to throttle valves 61 that are linked and connected to each other.

  One end portion of a pair of throttle cables 64... 65 for opening and closing the throttle valve 61 is wound around the throttle drums 63 corresponding to the front bank BF and the rear bank BR from opposite directions. These throttle cables 64, 65,... Are pulled out through the portion of the cleaner case 50A facing the purification chamber 52A of the first case member 54A. Moreover, grommets 67 are attached to the first case member 54A of the cleaner case 50A, and the two pairs of the throttle cables 64, 65,... Are inserted into the grommets 67.

  By the way, the first injectors 68 for injecting fuel when the engine rotates at high speed are arranged on the upper part of the purification chamber 52A so that the third case member 56A is provided for each cylinder at the ceiling portion of the cleaner case 50A of the air cleaner 29A. The air funnels 49 corresponding to the respective cylinders are disposed in the purification chamber 52A corresponding to the first injectors 68. In addition, the intake pipes 47 for each cylinder are attached with second injectors 69 that inject fuel at all times in the operating state of the engine, and the second injectors 69 are also accommodated in the purification chamber 52A of the cleaner case 50A. .

  Thus, the lead wires connected to the second injectors 69 and the lead wires connected to the sensors attached to the throttle body 48 are also pulled out to the outside through the first case member 54A with the same structure as the throttle cables 64 and 65. It is.

  A single intake air temperature sensor 57 and intake negative pressure sensors 59 for each cylinder are arranged in the cleaner case 50A. The intake air temperature sensor 57 is a portion facing the purification chamber 52A. The lead wire 58 connected to the inner surface of the third case member 56A in the cleaner case 50A so as to be disposed between the one injector 68 ... and the air funnel 49 ... passes through the third case member 56A. Is derived to the outside. The intake negative pressure sensors 59 are disposed in the purification chamber 52A, and are individually attached to the side walls of the intake pipes 47 on the side opposite to the second injectors 69, and each intake negative pressure sensor is provided. The conductive wires 60 connected to 59 ... penetrate through the grommets 70 attached to the first case member 54A of the cleaner case 50A and are led out to the outside.

  Thus, the first injector 68 is disposed so as to face the opening end of the air funnel 49 and can inject fuel into the throttle body 48 through the air funnel 49, and the front portion of the first injector 68 is disposed in the purification chamber. 52A is attached to the cleaner case 50A. In addition, the intake temperature sensor 57 attached to the cleaner case 50A on one side of the first injector 68 and facing the purification chamber 52A is attached to the axis of the first injector 68, as is apparent from FIG. Is set on the radially outer side than the opening surface of the air funnel 49 when viewed from a projection plane orthogonal to the air funnel 49.

Next, the operation of the first reference example will be described. Since the throttle body 48 is accommodated in the cleaner case 50A of the air cleaner 29A, the operation sound of the throttle body 48 is prevented from leaking out of the cleaner case 50A. The throttle body 48 can be insulated with a simple structure that only accommodates the throttle body 48 in the cleaner case 50A, and a separate protection means against mud, dust, rainwater, etc. is provided. This is unnecessary, and the capacity of the air cleaner 29A can be increased efficiently. Further, since the throttle bodies 48 are accommodated in the purification chamber 52A, the throttle bodies 48 can be arranged in a clean atmosphere so that the operation of the operating parts of the throttle bodies 48 is not affected by dust or the like. can do.

  Further, since the second injectors 69 are also accommodated in the purification chamber 52A, the second injectors 69 can be covered and protected by the cleaner case 50A, and the operation sound of the second injectors 69 can be protected by the cleaner case 50A. By suppressing leakage to the outside, the operation sound of the second injectors 69 can be insulated, and it is not necessary to take individual noise insulation measures for each of the second injectors 69, reducing costs and man-hours for assembly work. Can be reduced.

  Further, grommets 67 are attached to the first case member 54A of the cleaner case 50A at the portion facing the purification chamber 52A, and the throttle cables 64, 65,... Are inserted into the grommets 67, so that between the purification chamber 52A and the outside. The throttle cables 64, 65,... Can be pulled out from the cleaner case 50A while ensuring sealing performance easily.

  In addition, since intake negative pressure sensors 59 and intake temperature sensor 57 are arranged in cleaner case 50A, the influence of heat from the engine and the external environment does not affect intake negative pressure sensors 59 and intake temperature sensor 57 as much as possible. The engine control accuracy can be improved by improving the detection accuracy. In particular, since the intake air temperature sensor 57 is disposed in the purification chamber 52A in the cleaner case 50A, the detection accuracy of the intake air temperature sensor 57 can be maintained high.

  In addition, since the lead wires 60 connected to the intake negative pressure sensors 59 pass through the grommets 70 attached to the first case members 54A of the cleaner case 50A and are led out to the outside, the intake negative pressure sensors in the cleaner case 50A are extracted. When the lead wires 60 extending from 59... Are pulled out to the outside, it is possible to easily ensure the sealing performance between the cleaner case 50A and the outside and prevent dust or the like from entering the purification chamber 52A of the cleaner case 50A. it can.

3 and 4 show a second reference example, FIG. 3 is a longitudinal side view in the vicinity of the air cleaner, and FIG. 4 is a sectional view taken along line 4-4 of FIG.

  A body frame FB of the motorcycle includes a pair of left and right pipe-shaped main frames 75 extending downward from the head pipe 74, a down tube 76 extending downward from the head pipe 74, and rear portions of the main frames 75. A pair of left and right seat rails 77 extending rearward are provided, and an in-line multi-cylinder, for example, in-line 4-cylinder engine body 78 is supported on the main frame 75 and the down tube 76.

  Further, a fuel tank 79 is disposed above the main frames 75 and the seat rails 77, and an air cleaner 80A is disposed between the engine body 78 and the fuel tank 79.

  The fuel tank 79 includes a bowl-shaped tank case 81 that opens downward, and a bottom plate 82 that closes the lower open end of the tank case 81. The fuel tank 79 is provided at the peripheral edge of the lower open end of the tank case 81. The peripheral edge of the bottom plate 82 is caulked and joined to the flange 81a.

  An intake passage 84 extending linearly so as to guide the purified air from the air cleaner 80A is connected to the upper side wall of the cylinder head 83 in the engine body 78 for each cylinder.

  The intake passage portion 84 includes an intake pipe 85 connected to the upper side wall of the cylinder head 83, a throttle body 87 connected to the upstream end of the intake pipe 85 via an insulator 86, and a throttle body 87 An air funnel 88 connected to the upstream end is provided. The throttle body 87 and the air funnel 88 are accommodated in a cleaner case 89A of an air cleaner 80A, and an injector 90 is attached to the throttle body 87.

  The cleaner case 89A includes a bottom plate 82 of the fuel tank 79 and a synthetic resin case member 92A having an endless gasket 91 interposed between the outer peripheral portion of the bottom plate 82 and the case. The gasket 91 is interposed between the flange 107 provided on the outer peripheral portion of the member 92 </ b> A and the outer peripheral portion of the bottom plate 82. That is, the cleaner case 89A is configured such that the bottom plate 82 of the fuel tank 79 is a ceiling portion, and the bottom plate 82 is provided with a concave portion 82a that is recessed upward to increase the capacity of the cleaner case 89A.

  Moreover, both sides of the flange portion 107 are placed on both main frames 75 of the vehicle body frame FB, and the cross members 93 and 94 are installed between the main frames 75 and between the seat rails 77, respectively. The front part and the rear part of the collar part 107 are fastened. The case member 92A is supported by the insulators 86 of the intake passage portions 84.

  Incidentally, the cleaner case 89A is partitioned into an unpurified chamber 95A and a purified chamber 96A, and the purified chamber 96A is supported by the upstream end of each air funnel 88, and is formed in a bowl shape. 97 and an air funnel 88, which is attached to the partition plate 97 and covers the opening end of the partition plate 97 and covers the opening end of the partition plate 97, and has a backfire screen 99 attached to the upstream opening end. In the unclean chamber 95A formed in the cleaner case 89A outside the partition plate 97 and the cleaner element 98, and the injectors 90 attached to the throttle bodies 87. Is housed.

  An intake duct 100 is connected to the front portion of the case member 92A so as to communicate with the unpurified chamber 95A. Further, the throttle valves 101 of the throttle bodies 87 are connected to each other by interlocking / connecting means 102, and the outer surface of the throttle body 87 at one end along the arrangement direction of the throttle bodies 87 is interlocked to each other. A throttle drum 103 connected to the connected throttle valve 101 is disposed, and the throttle cables 104 and 105 wound around and engaged with the throttle drum 103 are portions of the case member 92A in the cleaner case 89A facing the unpurified chamber 95A. Is inserted into the grommet 106 attached to the outer periphery of the case and pulled out to penetrate the case member 92A.

  Further, in the cleaner case 89A, a single intake temperature sensor 57 and intake negative pressure sensors 59 for each cylinder are arranged. The intake temperature sensor 57 constitutes a part of the fuel tank 79. At the same time, it is attached to the bottom plate 82 constituting a part of the cleaner case 89A so as to face the unpurified chamber 95A, and the conducting wire 58 connected to the intake air temperature sensor 57 passes through the grommet 66 attached to the case member 92A and is led out to the outside. The The intake negative pressure sensors 59 are individually attached to the throttle bodies 87 so as to face the unpurified chamber 95A so as to detect intake negative pressure downstream of the throttle valves 101. Thus, the intake negative pressure sensor 59 detects the intake negative pressure in the throttle body 87, so that the detection accuracy does not decrease even if it is disposed in the unpurified chamber 95A. Further, the conducting wires 60 connected to the intake negative pressure sensors 59 are led out through the grommets 70 attached to the case member 92A of the cleaner case 89A.

According to the second reference example, the throttle body 87 and the injector 90 are accommodated in the cleaner case 89A of the air cleaner 80A, so that the operating sound of the throttle body 87 and the injector 90 is outside the cleaner case 89A. Leakage can be suppressed, and the operation sound of the throttle body 87 and the injector 90 can be insulated with a simple structure that only accommodates the throttle body 87 and the injector 90 in the cleaner case 89A. There is no need to take individual sound insulation measures for each, and costs and assembly man-hours can be reduced.

  Further, the throttle bodies 87 are accommodated in the unpurified chamber 95A, and the throttle cables 104 and 105 for opening and closing the throttle valves 101 of the throttle bodies 87 are disposed on the portion of the cleaner case 89A facing the unpurified chamber 95A. Since it penetrates and is pulled out to the outside, the airtight holding structure of the portion where the throttle cables 104 and 105 penetrate the cleaner case 89A can be simplified.

  Since the grommet 106 is attached to the case member 92A of the cleaner case 89A and the throttle cables 104 and 105 are inserted into the grommet 106, the throttle cable 104 is easily secured while ensuring the sealing performance between the unpurified chamber 95A and the outside. , 105 can be pulled out from the cleaner case 95A.

  Moreover, since the ceiling portion of the cleaner case 95A is composed of the bottom plate 82 of the fuel tank 79, the cleaner case 95A can be configured with a reduced number of parts.

  Further, since the auxiliary machines including the throttle body 87 are accommodated in the cleaner case 89A, the capacity of the cleaner case 89A can be sufficiently secured.

  In addition, since intake negative pressure sensors 59 and intake temperature sensor 57 are arranged in cleaner case 89A, the influence of heat from the engine and the external environment does not affect intake negative pressure sensors 59 and intake temperature sensor 57 as much as possible. The engine control accuracy can be improved by improving the detection accuracy.

  In addition, since the lead wire 58 connected to the intake air temperature sensor 57 and the lead wire 60 connected to the intake negative pressure sensor 59 pass through the grommets 66, 70 attached to the case member 92A of the cleaner case 89A, they are led out to the outside. When the lead wires 58, 60... Extending from the intake air temperature sensor 57 and the intake negative pressure sensor 59 in the cleaner case 89A are pulled out to the outside, the sealability between the cleaner case 89A and the outside is easily secured, and the inside of the cleaner case 89A. It is possible to prevent dust or the like from entering from the outside.

FIG. 5 shows a third reference example. An air cleaner 80B, in which a cleaner case 89B is constituted by a case member 92B supported by insulators 86 of the intake passage portions 84 and a bottom plate 82 of the fuel tank 79, is an engine. Arranged between the main body 78 and the fuel tank 79.

  A cleaner element 108 is provided between the bottom plate 82 and the case member 92B of the fuel tank 79 to partition the cleaner case 89B into an unpurified chamber 95B and a purified chamber 96B. The injector 90 is attached to the purified chamber 96B. The throttle bodies 87 and the air funnels 88 are accommodated.

  The throttle cables 104 and 105 that are wound around and engaged with the throttle drum 103 disposed on the outer surface of the throttle body 87 at one end along the arrangement direction of the throttle bodies 87 are purified out of the case member 92B of the cleaner case 89B. The grommet 109 attached to the portion facing the chamber 96B is inserted and pulled out through the case member 92B.

  A single intake air temperature sensor 57 and intake negative pressure sensors 59 for each cylinder are arranged in the cleaner case 89B. The intake air temperature sensor 57 constitutes a part of the fuel tank 79. At the same time, it is attached to the bottom plate 82 constituting a part of the cleaner case 89A so as to face the purification chamber 96B, and the lead wire 58 connected to the intake air temperature sensor 57 passes through the grommet 66 attached to the case member 92B and is led out to the outside. . The intake negative pressure sensors 59 are individually attached to the throttle bodies 87 in the purification chamber 96B, and the conductive wires 60 connected to the intake negative pressure sensors 59 are attached to the case member 92B in the cleaner case 89B. It penetrates through the grommets 70 and is led to the outside.

According to the third reference example, the throttle body 87 to which the injector 90 is attached is housed in the cleaner case 89B of the air cleaner 80B, so that the operation sound of the throttle body 87 and the injector 90 is not cleaned by the cleaner case 89B. Leakage to the outside can be suppressed, and the operation sound of the throttle body 87 and the injector 90 can be insulated with a simple structure that only accommodates the throttle body 87 in the cleaner case 89B. There is no need to take individual sound insulation measures, and costs and assembly man-hours can be reduced.

  Further, since the throttle bodies 87 are accommodated in the purification chamber 96B, the throttle bodies 87 can be arranged in a clean atmosphere so that the operation of the operating parts of the throttle bodies 87 is not affected by dust or the like. can do.

  Further, since the auxiliary machines including the throttle body 87 are accommodated in the cleaner case 89B, the capacity of the cleaner case 89B can be sufficiently secured.

  Further, since intake negative pressure sensors 59 and intake temperature sensor 57 are arranged in cleaner case 89B, the influence of heat from the engine and external environment does not affect intake negative pressure sensors 59 and intake temperature sensor 57 as much as possible. The engine control accuracy can be improved by improving the detection accuracy.

  In addition, since the lead wire 58 connected to the intake air temperature sensor 57 and the lead wire 60 connected to the intake negative pressure sensor 59 are penetrated through the grommets 66, 70 attached to the case member 92B of the cleaner case 89B and led out to the outside. When the lead wires 58, 60 extending from the intake air temperature sensor 57 and the intake negative pressure sensor 59 disposed in the purification chamber 96B of the cleaner case 89B are pulled out to the outside, the sealing performance between the purification chamber 96B and the outside is easily secured. In addition, dust or the like can be prevented from entering the purification chamber 96B from the outside.

FIG. 6 shows a first embodiment of the present invention. An air cleaner 29B is disposed above the engine body 78, and purified air from the air cleaner 29B is placed on the upper side wall of the cylinder head 83 in the engine body 78. Are connected to each cylinder through insulators 46, and the intake pipes 47, throttle bodies 48, and air funnels 49 of the intake passages 49 are It is housed in a cleaner case 50B of the air cleaner 29B.

  The air cleaner 29B is configured such that a cleaner element 53 that filters the air flowing from the unpurified chamber 51B to the purified chamber 52B is accommodated in a cleaner case 50B that is partitioned into an unpurified chamber 51B and a purified chamber 52B. The intake pipes 47 and the throttle bodies 48 are accommodated in the unpurified chamber 51B of the cleaner case 50B, and the air funnels 49 are accommodated in the purifying chamber 52B of the cleaner case 50B.

  In the cleaner case 50B, the first, second, and third case members 54B, 55B, and 56B made of synthetic resin are coupled to each other so as to sandwich the second case member 55B between the first and third case members 54B and 56B. The first and third case members 54B and 56B are formed in a bowl shape having openings facing each other, and the second case member 55B is an opening of the first and third case members 54B and 56B. It is formed in a cylindrical shape so as to connect the ends.

  Between the coupling ends of the second and third case members 55B and 56B, the entire peripheral edge portion of the partition plate 110 made of synthetic resin is airtightly sandwiched, and the cleaner case 50B is not opened by the partition plate 110. It is divided into a purification chamber 51B and a purification chamber 52B.

  Moreover, the support frame 71B of the cleaner element 53 is attached to the partition plate 110 so as to face the opening 111 provided in the partition plate 110 at the front portion along the front-rear direction of the motorcycle. Accordingly, the first and second case members 54B and 55B are connected to each other, but the third case member 56B is removed, and the cleaner element 53 having the support frame 71B attached to the partition plate 110 is connected to the first and second cleaner elements 53. By inserting the third case member 56B into the second case member 55B so as to cover the cleaner element 53 and the partition plate 110, the cleaner case 50B is configured and the cleaner element is inserted into the case members 54B and 55B. 53 is supported by the cleaner case 50B.

  The first case member 54 </ b> B is supported by the insulators 46. The ring-shaped insulators 46 interposed between the intake pipes 47 and the cylinder heads 83 of the intake passage portions 45. The first case members 54B are supported by the insulators 46 by fastening the intake pipes 47 to the cylinder head 83 with the air gaps interposed therebetween. Thus, the throttle bodies 48 are accommodated in the unpurified chamber 51B so as to be sandwiched between the partition plate 110 and the intake pipes 47, and the air funnels 49 connected to the throttle bodies 48. Enters the purification chamber 52B from the partition plate 110.

  An air introduction hole 112 is provided in the front portion of the first case member 54B along the front-rear direction of the motorcycle so as to communicate with the unpurified chamber 51B. An intake duct 113 for drawing air from outside is connected to both sides of the first case member 54B.

  Thus, the air introduced from the intake duct 113 into the unpurified chamber 51B flows from the front portion of the unpurified chamber 51B toward the cleaner element 53, and is far from the cleaner element 53 in the unpurified chamber 51B. The side portion, that is, the rear portion functions as an intake chamber, and the unpurified chamber 51B is formed so that a portion thereof functions as an intake chamber.

  The throttle valves 61 included in each throttle body 48 are interlocked and connected to each other, and the throttle body 48 interlocked and connected to each other on the outer surface of the throttle body 48 on one end side along the arrangement direction of the throttle bodies 48. A throttle drum 63 connected to the valves 61 is disposed.

  One end portions of a pair of throttle cables 64 and 65 for opening and closing the throttle valves 61 are wound and engaged with the throttle drum 63 from opposite directions, respectively. A portion of the cleaner case 50B facing the unpurified chamber 51B at the front of the second case member 55B is pulled out to the outside. In addition, a grommet 67 is attached to the second case member 55 </ b> B, and the throttle cables 64 and 65 are inserted through the grommet 67.

  By the way, the first injectors 68 for injecting fuel when the engine rotates at a high speed are arranged on the third case member 56B for each cylinder at the ceiling portion of the cleaner case 50B of the air cleaner 29B so as to be disposed above the purification chamber 52B. The air funnels 49 corresponding to the respective cylinders are arranged in the purification chamber 52B corresponding to the first injectors 68. A throttle body 48 and an intake pipe 47 connected to the air funnels 49 are disposed so as to pass through a portion of the unpurified chamber 51B disposed below the purification chamber 52B. In this operating state, the second injectors 69 that always inject fuel are attached to the intake pipe 47 for each cylinder, and the second injectors 69 are also accommodated in the unpurified chamber 51B of the cleaner case 50B.

  Thus, the delivery pipe 115 connected in common to the second injectors 69 is accommodated in the unpurified chamber 51B, and the fuel conduit 116 connected to the delivery pipe 115 and the conductor connected to the second injectors 69 ... 117... Are pulled out to the outside so as to be inserted into the grommet 118 attached to the second case member 55B of the cleaner case 50B at the portion facing the unpurified chamber 51B.

  In the cleaner case 50B, a single intake air temperature sensor 57 and intake negative pressure sensors 59 for each cylinder are arranged. The intake air temperature sensor 57 is a portion of the cleaner facing the purification chamber 52B. A conducting wire 58 attached to the inner surface of the third case member 56B in the case 50B and connected to the intake air temperature sensor 57 passes through the third case member 56B and is led out to the outside. The intake negative pressure sensors 59 are individually attached to the intake pipes 47 in the unpurified chamber 51B, and the conductive wires 60 connected to the intake negative pressure sensors 59 are connected to the first case member 54B in the cleaner case 50A. It penetrates through the attached grommets 70 and is led to the outside.

According to the first embodiment, since the throttle body 48 and the second injector 69 are accommodated in the cleaner case 50B of the air cleaner 29B, the operation sound of the throttle body 48 and the second injector 69 is operated. Can be prevented from leaking to the outside of the cleaner case 50B, and the throttle body 48 ... has a simple structure in which the intake pipe 47 ... to which the throttle body 48 ... and the second injector 69 ... are attached is housed in the cleaner case 50B. In addition, the operation sound of the second injectors 69 can be blocked, and rainwater or the like can be prevented from directly reaching the throttle body 48.

  Further, the unpurified chamber 51B is formed so that a part thereof functions as an intake chamber, and a dedicated component for forming the intake chamber is not required, so that the number of components can be reduced and the cost can be reduced.

  Further, the throttle body 48 is accommodated in the unpurified chamber 51B, and the throttle cables 64 and 65 for opening and closing the throttle valve 61 of the throttle body 48 are disposed at the portion facing the unpurified chamber 51B of the cleaner case 50B. Since it penetrates and is pulled out to the outside, the airtight holding structure of the portion where the throttle cables 64 and 65 penetrate the cleaner case 50B can be simplified.

  Since the grommet 67 is attached to the second case member 55B of the cleaner case 50B, and the throttle cables 64 and 65 are inserted into the grommet 67, the throttle is easily secured while ensuring the sealing performance between the unpurified chamber 51B and the outside. The cables 64 and 65 can be pulled out from the cleaner case 50B. Also, a grommet 118 is attached to the second case member 55B of the cleaner case 50B, and is connected to the fuel conduit 116 for supplying fuel to the second injectors 69 accommodated in the unpurified chamber 51B and the second injectors 69. Since the conducting wires 117 are inserted through the grommets 118, the fuel conduits 116 and the conducting wires 117 can be pulled out from the cleaner case 50B while easily ensuring a sealing property between the unpurified chamber 51B and the outside.

  Further, since auxiliary machines including the throttle body 48 are accommodated in the cleaner case 50B, the capacity of the cleaner case 50B can be sufficiently secured.

  Further, since intake negative pressure sensors 59 and intake temperature sensor 57 are arranged in cleaner case 50B, adverse effects due to heat from the engine and the external environment do not affect intake negative pressure sensors 59 and intake temperature sensor 57 as much as possible. The engine control accuracy can be improved by improving the detection accuracy.

  In addition, since the conducting wires 60 connected to the intake negative pressure sensors 59 pass through the grommets 70 attached to the first case member 54B of the cleaner case 50B and are led out to the outside, the intake air disposed in the cleaner case 50B. When pulling out the conducting wires 60 extending from the negative pressure sensors 59 to the outside, it is possible to easily secure the sealing performance between the cleaner case 50B and the outside and prevent dust or the like from entering the cleaner case 50B from the outside. .

7 and 8 show a second embodiment of the present invention. FIG. 7 is a side view of the main part of the motorcycle, and FIG. 8 is a longitudinal sectional view of the vicinity of the air cleaner.

  7, the motorcycle body frame FC includes a head pipe 122 that supports the front fork 121 so as to be steerable, a pair of left and right main frames 123 that extend rearwardly downward from the head pipe 122, and a head pipe 122. And a pair of left and right engine hangers 124 welded to the front portions of the main frames 123 and extending downward from the main frames 123, and a support plate provided at the lower portion of the engine hangers 124 and the rear portion of the main frames 123. A connecting pipe 125 for connecting the respective parts 131, a pair of left and right pivot plates 126 extending downward from the rear part of the main frame 123, and a first cross constructed between the front parts of the main frames 123. Between the pipe 127 and the upper parts of the pivot plates 126. A second cross pipe 128 provided, a third cross pipe 129 installed between the lower portions of the pivot plates 126, and left and right extending rearward and connected to the rear portions of the main frames 123. A pair of seat rails 130 are provided.

  The left and right bar-shaped steering handles 132 are connected to the upper portion of the front fork 121. A steering damper 133 is provided between the front end of the vehicle body frame FC, that is, the head pipe 122 and the front fork 121.

  An engine body 78 of a multi-cylinder engine in which, for example, four cylinders are arranged in parallel in the width direction of the vehicle body frame FC is supported at the lower part of the two engine hangers 124 and the upper and lower parts of the two pivot plates 126.

  A front end portion of a swing arm 136 is swingably supported via a support shaft 137 at an intermediate portion between the pivot plates 126 in the vertical direction. A rear axle is mounted on the rear end portion of the swing arm 136. It is supported rotatably.

  The power from the output shaft 139 of the transmission built in the engine body 78 is transmitted to the rear wheel WR via the chain transmission means 140, and the chain transmission means 140 is fixed to the output shaft 139. Drive sprocket 141, a driven sprocket (not shown) fixed to the rear wheel, and an endless chain 143 wound around the drive sprocket 141 and the driven sprocket. Placed on the left side of the engine.

  A link mechanism 144 is provided between the third cross pipe 129 and the swing arm 136 connecting the lower portions of the pivot plates 126. The link mechanism 144 is a first connection shaft 147 parallel to the support shaft 137. The first link 145 whose one end is connected to the third cross pipe 29 and the second connecting shaft 147 that is parallel to the first connecting shaft 147 and can be rotated about the axis of the second connecting shaft 150. The second link 76 is connected to the lower end of the arm 136 and connected to the other end of the first link 145 through a third connection shaft 151 parallel to the first and second connection shafts 147 and 150.

  The other end portion of the first link 145 is connected to the rear portion of the second link 146 via a third connecting shaft 151, and the rear end is connected to a bracket 136a provided at the front portion of the swing arm 136. A lower end portion of the cushion unit 152 is connected to a front portion of the second link 146 via a fourth connection shaft 153.

  Above the cylinder head 83 in the engine main body 78, an air cleaner 29C for purifying air supplied to the engine is disposed so as to be located behind the head pipe 122 in the vehicle body frame FC, and the rear part of the air cleaner 29C. A fuel tank 154 covering the upper portion of the vehicle body frame FC is mounted on both main frames 123... And a radiator 155 is disposed in front of the engine body 78. A seat 156 for seating the rider is supported on the seat rails 130 behind the fuel tank 154.

  The exhaust system 160 connected to the cylinder head 83 of the engine body 78 connects the individual exhaust pipes 161, 161... Individually connected to the lower part of the front side wall of the cylinder head 83 and the pair of individual exhaust pipes 161, 161 in common. A pair of first collective exhaust pipes 162 and a pair of first collective exhaust pipes 162 are connected in common and a single second collective exhaust pipe 163 in which a first exhaust muffler 164 is interposed in the middle portion. And a second exhaust muffler (not shown) connected to the downstream end of the second collective exhaust pipe 163.

  The individual exhaust pipes 161, 161... Extend downward from the front of the engine body 78, and the first collective exhaust pipes 162. The second collective exhaust pipe 163 rises while curving from the lower side of the engine body 78 toward the right side of the vehicle body, and further extends rearward. Thus, the first exhaust muffler 164 is interposed at the rising portion of the second collective exhaust pipe 163.

  A diameter-enlarged portion 163a is provided at an intermediate portion of the second collective exhaust pipe 163, and the flow area in the second collective exhaust pipe 163 is changed in the enlarged-diameter portion 163a according to the engine speed. An exhaust control valve 166 for controlling exhaust pulsation in the exhaust system 160 is provided.

  An actuator 159 is supported on one support plate 131 in the vehicle body frame FC, and the exhaust control valve 166 and the actuator 159 are connected by a pair of transmission wires 167 and 168, and both transmissions are performed according to the operation of the actuator 159. By pulling one of the wires 167 and 168, the exhaust control valve 166 is opened and closed.

  In FIG. 8, an intake passage 45 extending linearly so as to guide purified air from an air cleaner 29 </ b> C above the cylinder head 83 is connected to the upper side wall of the cylinder head 83 for each cylinder. The throttle body 48 provided in the intake passage portions 45 is connected to the upper side wall of the cylinder head 83 via the intake pipe 47 and the insulator 46.

  The air cleaner 29C has a cylindrical cleaner element 157 for filtering the air flowing from the unpurified chamber 51C to the purified chamber 52C into a cleaner case 50C, the interior of which is partitioned into an unpurified chamber 51C and a purified chamber 52C. The intake pipe 47 and the throttle body 48 are accommodated in an unpurified chamber 51C of a cleaner case 50C, and the air funnel 49 is a cleaner case. It is accommodated in a 50C purification chamber 52C.

  In the cleaner case 50C, the first, second and third case members 54C, 55C and 56C made of synthetic resin are coupled to each other so that the second case member 55C is sandwiched between the first and third case members 54C and 56C. The first and third case members 54C and 56C are formed in a bowl shape having openings facing each other, and the second case member 55C is an opening of the first and third case members 54C and 56C. It is formed in a cylindrical shape so as to connect the ends.

  Between the coupling ends of the second and third case members 55C and 56C, the entire peripheral edge portion of the partition plate 158 made of synthetic resin is airtightly sandwiched, and the cleaner case 50C is not sealed by the partition plate 158. It is divided into a purification chamber 51C and a purification chamber 52C.

  Moreover, the support frame 156 of the cleaner element 157 is attached to the partition plate 158 so as to face the opening 169 provided in the partition plate 158 at the front portion along the front-rear direction of the motorcycle. Accordingly, the first and second case members 54C and 55C are connected to each other, but the third case member 56C is removed, and the cleaner element 157 having the support frame 156 attached to the partition plate 158 is attached to the first and second case elements. By inserting the third case member 56C into the second case member 55C so as to cover the cleaner element 157 and the partition plate 158, the cleaner case 50C is configured and the cleaner element is inserted into the case members 54C and 55C. 157 is supported by the cleaner case 50C.

  The first case member 54C is supported by the insulators 46 of the intake passage portions 45, and the intake pipes 47 are fastened to the cylinder head 83 with the insulators 46 sandwiched between the cylinder head 83. 54 C of 1st case members will be supported by each insulator 46 .... Thus, the throttle bodies 48 are accommodated in the unpurified chamber 51C so as to be sandwiched between the partition plate 158 and the intake pipes 47, and the air funnels 49 connected to the throttle bodies 48. Enters the purification chamber 52C from the partition plate 158.

  Below the head pipe 121 provided at the front end of the vehicle body frame FC, an intake duct 170 for introducing outside air to the air cleaner 29C is disposed so as to extend forward from the air cleaner 29C. The portion is connected to the front portion of the first case member 54C in the cleaner case 50C so as to introduce outside air into the front portion of the unpurified chamber 51C.

  Thus, the air introduced into the unpurified chamber 51C from the intake duct 170 flows from the front portion of the unpurified chamber 51C toward the cleaner element 157, and is far from the cleaner element 157 in the unpurified chamber 51C. The side portion, that is, the rear portion functions as an intake chamber, and the unpurified chamber 51C is formed so that a portion thereof functions as an intake chamber.

  The intake duct 170 is formed such that the rear part is inclined rearward and upward in a side view, and the front part of the intake duct 170 is supported by the vehicle body frame FC. A radiator 155 is disposed below the intake duct 170. Stays 171 are extended upward from both sides of the radiator 155, and a front portion of the intake duct 170 is supported by the stays 171.

  In the front portion of the intake duct 170, a pair of intake control valves 172 and 173 for controlling the intake flow area in the intake duct 170 in accordance with the engine speed are disposed. 173 operates in conjunction with the rotation of the rotation shaft 174, and rotational force is transmitted to the rotation shaft 174 from the actuator 159 via a transmission wire 175 (see FIG. 7).

  One end portions of a pair of throttle cables 64 and 65 for opening and closing the throttle valves 61 included in each throttle body 48 are wound and engaged with each other from opposite directions, and the throttle cables 64 and 65 are engaged with each other. The portion of the cleaner case 50C that faces the unpurified chamber 51C at the front of the second case member 55C is pulled out to the outside. Moreover, a grommet is attached to the second case member 55C, and the throttle cables 64 and 65 are inserted into the grommet.

  The first injectors 68 for injecting fuel during high-speed rotation of the engine are attached to the third case member 56C for each cylinder at the ceiling portion of the cleaner case 50C of the air cleaner 29C so as to be disposed above the purification chamber 52C. The air funnels 49 corresponding to the respective cylinders are arranged in the purification chamber 52C corresponding to the first injectors 68. Further, between the unpurified chamber 51C and the throttle body 48, which is connected to the air funnel 49, and the throttle head 48, and the cylinder head 83 so as to pass through a portion disposed below the purified chamber 52C. Are connected to the intake pipe 47 for each cylinder, and the second injector 69 is also a cleaner case. It is accommodated in an unpurified chamber 51C of 50C.

  The delivery pipe 115 connected in common to the second injectors 69 is accommodated in the unpurified chamber 51C, a fuel conduit 116 connected to the delivery pipe 115, and a conductor 117 connected to the second injectors 69. However, it is pulled out to the outside so as to be inserted into the grommet 118 attached to the second case member 55C of the cleaner case 50C at the portion facing the unpurified chamber 51C.

  Further, a single intake air temperature sensor 57 and intake negative pressure sensors 59 for each cylinder are arranged in the cleaner case 50C. The intake air temperature sensor 57 is a cleaner at a portion facing the purification chamber 52C. The lead wire 58 attached to the inner surface of the third case member 56C in the case 50C and connected to the intake air temperature sensor 57 passes through the third case member 56C and is led out to the outside. The intake negative pressure sensors 59 are individually attached to the intake pipes 47 in the unpurified chamber 51C, and the conductive wires 60 connected to the intake negative pressure sensors 59 are connected to the first case member 54C in the cleaner case 50C. It penetrates through the attached grommets 70 and is led to the outside.

The same effects as those of the first embodiment can be obtained by the second embodiment.

9 and 10 show a third embodiment of the present invention. FIG. 9 is a side view of the motorcycle, and FIG. 10 is a longitudinal sectional view of the vicinity of the air cleaner.

  9, the motorcycle body frame FD includes a head pipe 122 that supports the front fork 121 so as to be steerable, a pair of left and right main frames 123 ′ extending downward from the head pipe 122, and a head pipe. 122 and a pair of left and right engine hangers 124 that are welded to the front portions of the main frames 123 ', and extend downward from the main frames 123', and the lower portions of the engine hangers 124 and the rear portions of the main frames 123 '. A connecting pipe 125 that connects the support plate portions 131, a pair of left and right pivot plates 126 that extend downward from the rear portion of the main frame 123 ', and a front portion of the main frame 123'. First cross pipe 127 and the pivot plates 126 A second cross pipe 128 installed between the upper parts of the two, a third cross pipe 129 installed between the lower parts of the pivot plates 126, and a rear part of the main frames 123 'extending backward. And a pair of left and right seat rails 130 connected to each other.

  In order to purify the air supplied to the engine above the cylinder head 83 in the engine body 78 of the multi-cylinder engine supported by the lower parts of the engine hangers 124 and the upper and lower parts of the pivot plates 126. The air cleaner 29D is disposed so as to be positioned behind the head pipe 122 in the vehicle body frame FD, and a fuel tank 154 covering the rear and upper portions of the air cleaner 29D is mounted on both main frames 23 'in the vehicle body frame FD. The

  In FIG. 10, an intake passage 45 extending linearly so as to guide purified air from an air cleaner 29D above the cylinder head 83 is connected to the upper side wall of the cylinder head 83 for each cylinder. The throttle body 48 provided in the intake passage portions 45 is connected to the upper side wall of the cylinder head 83 via the intake pipe 47 and the insulator 46.

  The air cleaner 29D has a cylindrical cleaner element 157 for filtering the air flowing from the unpurified chamber 51D to the purified chamber 52D in the cleaner case 50D, the interior of which is partitioned into the unpurified chamber 51D and the purified chamber 52D. The throttle body 48 is housed in an unpurified chamber 51D of the cleaner case 50D, and the air funnel 49 is disposed in the purifying chamber 52D of the cleaner case 50D. Is housed in.

  In the cleaner case 50D, the first, second, and third case members 54D, 55D, and 56D made of synthetic resin are coupled to each other so that the second case member 55D is sandwiched between the first and third case members 54D and 56D. The first and third case members 54D and 56D are formed in a bowl shape having openings facing each other, and the second case member 55D is an opening of the first and third case members 54D and 56D. It is formed in a cylindrical shape so as to connect the ends.

  Between the coupling ends of the second and third case members 55D and 56D, the entire peripheral edge portion of the partition plate 158 made of synthetic resin is airtightly sandwiched, and the cleaner case 50D is not sealed by the partition plate 158. It is divided into a purification chamber 51D and a purification chamber 52D.

  Moreover, the support frame 156 of the cleaner element 157 is attached to the partition plate 158 so as to face the opening 169 provided in the partition plate 158 at the front portion along the front-rear direction of the motorcycle. Accordingly, the first and second case members 54D and 55D are connected to each other, but the third case member 56D is removed, and the cleaner element 157 having the support frame 156 attached to the partition plate 158 is attached to the first and second case elements. By inserting the third case member 56D into the second case member 55D so as to cover the cleaner element 157 and the partition plate 158, the cleaner case 50D is configured and the cleaner element is inserted into the case members 54D and 55D. 157 is supported by the cleaner case 50D.

  Each throttle body 48 is accommodated in the unpurified chamber 51D so as to be sandwiched between the partition plate 158 and the intake pipe 47, and the air funnel 49 connected to each throttle body 48 is a partition. The plate 158 enters the purification chamber 52D.

  Incidentally, the front of the head pipe 122 is covered with a front cowl 176, and both sides of the front part of the vehicle body are covered with a pair of left and right center cowls 177 connected to the front cowl 176, and a part of the engine body 78 and the exhaust system 160 are covered. A lower cowl 178... That covers most of the individual exhaust pipes 161... Constituting a part from both sides is connected to the center cowl 177. Further, most of the second exhaust muffler 165 provided at the downstream end of the exhaust system 160 and the rear portions of both seat rails 130 are covered with a rear cowl 179, and the fuel tank 154 and the air cleaner 29D are covered with a cover 180.

  In the cleaner case 50D, intake holes 181 for introducing outside air to the rear part of the unpurified chamber 51D are provided on both sides of the rear part of the first case member 54D, and the downstream ends are electrically connected to the intake holes 181. The sucked intake ducts 182 pass through the insertion holes 183 provided in the intermediate part of the main frames 123 ', and extend forward between the center cowl 177 and the main frames 123'.

  As described above, the air introduced from the intake duct 182 to the rear portion of the unpurified chamber 51D flows from the front portion of the unpurified chamber 51D toward the cleaner element 157, and a part of the unpurified chamber 51D is inhaled. It will function as a chamber.

  One end portions of a pair of throttle cables 64 and 65 for opening and closing the throttle valves 61 included in each throttle body 48 are wound and engaged with each other from opposite directions, and the throttle cables 64 and 65 are engaged with each other. The portion of the cleaner case 50D that faces the unpurified chamber 51D at the front of the second case member 55D is pulled out to the outside. Moreover, a grommet is attached to the second case member 55D, and the throttle cables 64 and 65 are inserted through the grommet.

  The first injectors 68 for injecting fuel during high-speed rotation of the engine are attached to the third case member 56D for each cylinder at the ceiling of the cleaner case 50D of the air cleaner 29D so as to be disposed above the purification chamber 52D. The air funnels 49 corresponding to the respective cylinders are arranged in the purification chamber 52D corresponding to the first injectors 68. Further, between the unpurified chamber 51D and the throttle body 48 connected to the air funnel 49, the throttle body 48, and the cylinder head 83 so as to pass through a portion disposed below the purified chamber 52D. Are connected to the intake pipe 47 for each cylinder, and the second injector 69 is also a cleaner case. It is accommodated in a 50D unpurified chamber 51D.

  The delivery pipe 115 connected in common to the second injectors 69 is accommodated in the unpurified chamber 51C, a fuel conduit 116 connected to the delivery pipe 115, and a conductor 117 connected to the second injectors 69. However, it is drawn out so as to be inserted into the grommet 118 attached to the second case member 55D of the cleaner case 50D at the portion facing the unpurified chamber 51D.

  In the cleaner case 50D, a single intake air temperature sensor 57 and intake negative pressure sensors 59 for each cylinder are arranged. The intake air temperature sensor 57 is a cleaner at a portion facing the purification chamber 52D. A conducting wire 58 attached to the inner surface of the third case member 56D in the case 50D and connected to the intake air temperature sensor 57 passes through the third case member 56D and is led out to the outside. The intake negative pressure sensors 59 are individually attached to the intake pipes 47 in the unpurified chamber 51D, and the conductive wires 60 connected to the intake negative pressure sensors 59 are connected to the first case member 54D in the cleaner case 50D. It penetrates through the attached grommets 70 and is led to the outside.

According to the third embodiment, the same effect as that of the first embodiment can be obtained.

11 and 12 show a fourth reference example. FIG. 11 is a side view of the motorcycle, and FIG. 12 is an enlarged vertical side view of the vicinity of the air cleaner.

  11, a motorcycle body frame FE includes a head pipe 192 that supports a front fork 191 that pivotally supports a front wheel WF at a lower end portion, and a main frame 193 that extends rearward and downward from the head pipe 192. And a down tube 194 that extends downward from the head pipe 192 with a larger inclination angle than the front portion of the main frame 193 and is coupled to the rear end of the main frame 193. A pair of left and right seat rails 195 that are connected to an intermediate portion and extend rearward, a pivot plate 196 that is connected to a connection portion of the main frame 193 and the down tube 194, and the main frame 193. And from the connecting portion of the down tube 194. Beauty comprising a coupling frame 197 ... and that is connected to both the seat rails 195 ... intermediate portion of Te.

  A bar-shaped steering handle 198 is connected to an upper portion of the front fork 191, and a front fender 199 that covers the front wheel WF is supported on the front fork 191. Also, the pivot plates 196 are supported so that the front ends of the swing arms 200 are swingable up and down via the support shafts 201, and the rear wheels WR are rotatably supported at the rear ends of the swing arms 200. The Further, rear cushion units 202 are provided between the swing arms 200 and the connecting portions of the connecting frames 197 and the seat rails 195.

  The main frame 193 and the down tube 194 support an engine main body 203 of a multi-cylinder engine in which four cylinders are arranged in parallel in the width direction of the body frame FE, and a transmission incorporated in the engine main body 203. Rotational power output from the output shaft 205 is transmitted to the rear wheel WR via the chain transmission means 206. The chain transmission means 206 includes a drive sprocket 207 fixed to the output shaft 205, and a rear wheel. A driven sprocket 208 fixed to the WR and an endless chain 209 wound around both the sprockets 207, 208 are arranged on the left side of the engine with the motorcycle facing forward in the traveling direction.

  A tandem-type riding seat 210 is provided above both seat rails 196... Above the rear wheel WR. The main frame 193... Is positioned above the engine body 203 in front of the riding seat 210. Thus, the fuel tank 211 is supported.

  Referring also to FIG. 12, an air cleaner 29E for purifying air supplied to the engine is disposed behind the cylinder head 204 in the engine body 203 so as to be covered from above by the fuel tank 211. The

  An intake passage portion 214 extending linearly so as to guide purified air from the air cleaner 29E is connected to each cylinder on the rear side wall of the cylinder head 204. The intake passage portion 214 is connected to the cylinder head 204. An insulator 215 connected to the rear side wall; a throttle body 216 whose downstream end is connected to the insulator 215; and an air funnel 217 connected to the upstream end of the throttle body 216. The air funnel 217 is accommodated in the cleaner case 218 of the air cleaner 29E.

  The air cleaner 29E is configured such that a cylindrical cleaner element 221 for filtering air flowing from the unpurified chamber 219 to the purifier chamber 220 is accommodated in a cleaner case 218 that is partitioned into an unpurified chamber 219 and a purifier chamber 220. The throttle body 216 is accommodated in the non-purification chamber 219, and the air funnel 217 is accommodated in the purification chamber 220.

  The cleaner case 218 is formed by separating the first and second case halves 222 and 223 that are formed in a bowl shape with the sides facing each other with a synthetic resin, between the opposing ends of the case halves 222 and 223. The first case half 222 is supported by an insulator 215 between the throttle body 216 and the cylinder head 204, and is not purified between the partition plate 224 and the first case half 222. A chamber 219 is formed, and a purification chamber 220 disposed behind the unpurified chamber 219 is formed between the partition plate 224 and the second case half 223. The cleaner element 221 is sandwiched between the lower part of the partition plate 224 and the second case half 223 so that air flows from the unpurified chamber 219 side.

  Incidentally, the exterior design surface of the cleaner case 218 on the side of the vehicle body in the air cleaner 29E can be configured as a body cover member continuous with the side cover 228 as shown in FIG. Since the design can be formed, a special body cover member is not required, and the number of parts can be reduced and the appearance design can be supported.

  The throttle body 216 is accommodated in the unpurified chamber 219 so as to be sandwiched between the partition plate 224 and the insulator 215, and the air funnel 217 connected to the throttle body 216 enters the purification chamber 220 from the partition plate 224. It is rushed. An injector 225 is attached to the throttle body 216, and this injector 225 is also accommodated in the unpurified chamber 219.

  An air introduction hole 226 is provided in the upper part of the first case half 222 so as to communicate with the unpurified chamber 219, and air from outside is drawn into the unpurified chamber 219 through the air introduction hole 226. The intake duct 227 is connected to the upper portion of the first case half 222. In addition, the intake duct 227 is formed in a substantially L shape so as to bend rearward from the air introduction hole 226, and a recess 211 a for arranging the intake duct 227 is provided at the bottom of the fuel tank 211. It is done. That is, the intake duct 227 is disposed below the fuel tank 211 so as to be covered with the fuel tank 211.

According to the fourth reference example, the throttle body 216 and the injector 225 attached to the throttle body 216 are accommodated in the cleaner case 218 of the air cleaner 29E. The operation sound of the throttle body 216 can be blocked by suppressing the operation sound of the throttle body 216 from leaking out of the cleaner case 218 with a simple structure that can only be accommodated in the interior of the cleaner case 218. It is not necessary to provide a separate protection means, and the capacity of the air cleaner 29E can be increased efficiently. In addition, since the injector 225 is also housed in the cleaner case 218, the operation sound of the injector 225 can be insulated by the cleaner case 218, so that it is not necessary to take individual noise insulation measures for each injector 225, reducing costs and assembling work. Man-hours can be reduced.

  Further, since the throttle body 216 and the injector 225 are accommodated in the unpurified chamber 219, the capacity of the unpurified chamber 219 is relatively large to accommodate the throttle body 216 and injector 225, so that the intake efficiency can be increased. At the same time, dust and the like are easily collected in the unpurified chamber 219, so that the cleaner element 221 is hardly contaminated and the durability is improved.

  Further, an intake duct 227 connected to the cleaner case 218 through the unpurified chamber 219 is disposed below the fuel tank 211, so that the intake air temperature can be sound-insulated by the fuel tank 211, and the throttle body 216 and injector The operation sound of 225 can also be sound-insulated more effectively.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

It is a side view of a motorcycle according to a first reference example. It is an enlarged vertical side view of the vicinity of the air cleaner. It is a vertical side view near the air cleaner of the second reference example. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a vertical side view near the air cleaner of the third reference example. It is a vertical side view of the air cleaner vicinity of 1st Example of this invention . It is a principal part side view of the motorcycle of 2nd Example. It is a longitudinal cross-sectional view near an air cleaner. FIG. 6 is a side view of a motorcycle according to a third embodiment. It is a longitudinal cross-sectional view near an air cleaner. It is a side view of the motorcycle of the 4th reference example. It is a vertical side view of the vicinity of the air cleaner.

8 3... Cylinder heads 29 B to 29 D Air cleaner 47 Air intake pipe 4 8 Throttle body 49 Air funnels 50 B to 50 D Cleaner case 51 B- 51D ... Unpurified chamber 52 B- 52D ... Purified chamber 53, 157 ··· Cleaner element 57 · · · Intake air temperature sensor 58 and 60 · · Lead wire 59 · · · Intake negative pressure sensor 66, 70 .. Grommet 68... Injector 69... Second injector
110... Partition plate 211... Fuel tank 227.

Claims (4)

Inside unpurified chamber by a partition plate (110) (51 B ~51D) and clean chamber (52 B ~52D) compartmentalized cleaner case (50 B ~50D) the unpurified chamber in (51 B ~51D) purification chamber an air cleaner (29 B ~29D) the cleaner element for filtering air flowing (53,157) is housed (52 B ~52D), a cylinder head from the cleaning chamber (52 B ~52D) from (28F 28R, 83) includes a throttle body (4 8 ) for controlling the amount of air supplied to the throttle body (48) and an intake pipe (47) connecting the cylinder head (83) , and the cleaner case ( 50 B and the ～50D) said throttle body (4 8), an air funnel (49) Togahai which is connected to the upstream end of the throttle body (4 8) An air intake device for a vehicle engine,
The throttle body (48) is sandwiched between the partition plate (110) and the intake pipe (47) disposed in the unpurified chambers (51B to 51D). 51D), and the air funnel (49) enters the purification chamber (52B to 52D) through the hole of the partition plate (110) and directly opens the tip to the purification chamber (52B to 52D). And
The air funnel (49) the cleaning chamber (52 B ~52D) injector (68) disposed opposite the open end capable of injecting fuel into the throttle body (4 8) in through the air funnel (49) to the but attached to the injector said tip portion (68) clean room so as to protrude (52 B ~52D) said cleaner case (50 B ~50D), before Symbol cleaner case (50 B ~50D) , said with intake air temperature sensor facing the cleaning chamber (52 B ~52D) (57) is mounted, the mounting position, the air funnel viewed in projection plane perpendicular to the axis of the injector (68) (49) Is set radially outward from the opening surface of
Intake negative pressure sensor disposed in front Symbol cleaner case (50 B ~50D) in (59) is, the intake pipe (47) or said throttle body (48), facing the the unpurified chamber (51B～51D) An intake device for a vehicle engine, wherein the intake device is attached to a portion so as to detect an intake negative pressure in the intake pipe (47) or the throttle body (48) . The conductors connected to at least one of the intake negative pressure sensor (59) and the intake air temperature sensor (57) (60,58) is passed through the grommet (70 and 66) mounted to said cleaner case (50 B ~50D) The vehicle engine intake device according to claim 1, wherein the intake device is derived outside. Vehicle according to claim 1 or 2, wherein the said intake temperature sensor on the inner surface of the cleaner case at a portion facing the cleaning chamber (52 B ~52 D) (50 B ~50 D) (57) is mounted intake equipment of use engine. Wherein the second injector attached to an intake pipe (47) or said throttle body (48) (69) is housed said to unpurified chamber (51B～51D), any claim 1-3 intake equipment of a vehicle engine crab according.

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