JP4529177B2 - Engine intake system structure - Google Patents

Description

  The present invention relates to an intake system structure of an engine, and in particular, an air cleaner case can be disposed on the upper surface of the engine while securing a sufficient space for protecting a pedestrian, and the filter area of the filter can be increased. The present invention relates to an intake system structure of an engine that can reduce the passage resistance of intake air taken from an intake side intake passage and improve the filtration efficiency.

  An engine mounted in an engine room of a vehicle is provided with an intake system structure in which intake system components including an air cleaner, a resonator, an air cleaner inlet duct, a resonator duct, and the like are disposed.

As such an intake system structure of an engine, there is one in which an engine and a transmission are arranged side by side in a vehicle width direction, and an air cleaner is provided above the transmission.
JP-A-9-96258 Japanese Utility Model Publication No. 2-139357 JP-A-8-326614 Japanese Utility Model Publication No. 3-8649

  By the way, in the conventional engine intake system structure, when the engine room is narrow and there is no space for mounting an air cleaner on the vehicle body, or when the vibration of the engine is prevented from being transmitted to the vehicle body as much as possible, An air cleaner is disposed on the upper surface of the substrate.

  However, when an air cleaner is installed on the upper surface of the engine, if an air cleaner capacity that satisfies the target engine performance is to be secured, the air cleaner becomes larger and a pedestrian is placed between the hood that covers the engine room and the air cleaner. There is a problem that the space for protection is reduced.

  In order to improve the filtration performance of the air cleaner, it is effective to enlarge the filtration area of the filter (enlarge the filter), but the space on the upper surface of the engine is limited and the filtration area of the filter is enlarged. There are problems that are difficult to do.

  To solve this problem, as disclosed in Patent Documents 1 to 4, there is an intake system structure in which an air cleaner is disposed above the transmission. However, the engine and the transmission are arranged in the width direction of the vehicle. In the intake system structure in which the surge tank is disposed on the rear side of the engine, the intake passage that leads from the air cleaner disposed on the upper side of the transmission to the surge tank disposed on the rear side of the engine is curved. Therefore, since it cannot be formed linearly, there is a problem in that the intake passage resistance increases.

  The present invention relates to an engine intake system structure in which an engine and a transmission are arranged side by side in a vehicle width direction, and intake air taken in from an inlet side intake passage is filtered by an air cleaner mounted on the engine and flows into a surge tank. The air cleaner includes an air cleaner case including a first case constituting a dirty side and a second case constituting a clean side, and the first case and the second case are divided in the left-right direction of the vehicle, A mating surface portion between the first case and the second case is disposed obliquely with respect to a side surface facing the mating surface portion on the first case side above the transmission, and the bottom surface of the first case and the bottom surface of the second case And a bulging portion extending downward from the upper end of the cylinder head cover of the engine, and contacting the inlet side intake passage on the bottom surface of the bulging portion on the first case side. The inlet side opening is provided, the filter extending in the vertical direction along the mating surface portion is disposed obliquely, and the flow of the intake air that has passed through the filter continuously to the bulging portion on the second case side An extension portion extending in the direction is formed in the second case, and the extension portion of the second case is disposed on the upper surface of the cylinder head cover.

  An intake system structure for an engine according to the present invention includes an air cleaner case divided in the left-right direction of a vehicle, and a mating surface portion between a first case and a second case in which a filter extending in a vertical direction requiring the most space is disposed. The air cleaner case is placed on the upper surface of the engine while securing a sufficient space for pedestrian protection between the hood and the air cleaner that covers the engine room by arranging it diagonally using the space above the transmission. It can be arranged. In the engine intake system structure of the present invention, the mating surface portion of the first case and the second case is disposed obliquely with respect to the side surface of the first case facing the mating surface portion. The filtration area of the filter disposed along the passage can be enlarged, the passage resistance of the intake air taken in from the inlet side intake passage can be reduced, and the filtration efficiency can be improved.

In the intake system structure of the engine according to the present invention, the mating surface portion of the first case and the second case of the air cleaner case divided in the left-right direction of the vehicle is disposed obliquely by utilizing the space above the transmission. The air cleaner case can be disposed on the upper surface of the engine while securing a sufficient space for protecting the person, and the mating surface portion on which the filter is disposed is disposed obliquely, so that the filtration area of the filter is reduced. It is possible to expand, reduce the passage resistance of the intake air, and improve the filtration efficiency.
Embodiments of the present invention will be described below with reference to the drawings.

  1 to 9 show an embodiment of the present invention. 1-3, 2 is an engine mounted horizontally in an engine room of a vehicle (not shown), 4 is a transmission arranged side by side on the left side that is one side of the vehicle 2 in the vehicle width direction (left-right direction). It is. In the engine 2, a cylinder head 8 is mounted on the upper part of the cylinder block 6, a cylinder head cover 10 is attached to the cylinder head 8, and an oil pan 12 is attached to the lower part of the cylinder block 6.

  In the engine 2, a chain cover 14 is attached to the right side of the cylinder block 6 and the cylinder head 8, and the transmission 4 is connected to the left side of the cylinder block 6 and the oil pan 12. An oil filler cap 16 is detachably provided on the cylinder head cover 10 on the front side and on the chain cover 14 side.

  The engine 2 has an exhaust manifold (not shown) attached to the front side of the cylinder head 8 and an intake manifold 18 attached to the rear side of the cylinder head 8. As shown in FIG. 9, the intake manifold 18 includes a surge tank 20 and four branch pipes 22. The upstream side of the branch pipe 22 is assembled and connected to the surge tank 20. The branch pipe 22 is linearly aligned and connected to the downstream side by a flange 24.

  The intake manifold 18 is attached by a mounting bolt 28 and a mounting nut 30 with the flange 24 abutting against the rear surface of the cylinder head 8 via a gasket 26. In the intake manifold 18, a stiffener 32 is attached to the surge tank 20 with an attachment bolt 34, and the stiffener 32 is attached to the cylinder head 8 with an attachment bolt 36.

  The surge tank 20 is disposed on the rear side of the cylinder head 8, and a tank side opening 40 is provided on the front surface of the tank chamber 38. A throttle body 42 is attached to the tank side opening 40 with a mounting bolt 46 via a gasket 44. The throttle body 42 is provided with a body passage 48 communicating with the tank side opening 40.

  The throttle body 42 is provided with one end of an accelerator cable 50 connected thereto, and is connected with one end of each of a cooling water inlet hose 52 and a cooling water outlet hose 54. The other end of the accelerator cable 50 is connected to an accelerator pedal (not shown). The other end of the cooling water inlet hose 52 is connected to a cooling water passage (not shown) of the cylinder head 8. The other end side of the cooling water outlet hose 54 is connected to a water inlet pipe (not shown).

  The surge tank 20 is provided with an extension portion 56 extending to the chain cover 14 side, which is the right side in the vehicle width direction. The extension portion 56 is provided with an extension chamber 58 that communicates with the tank chamber 38, a tank side connection portion 60 to which a resonator hose 148 described later is connected, and a PCV connection portion 62. One end of a PCV hose 64 is connected to the PCV connecting part 62. The other end of the PCV hose 64 is connected to a breather chamber (not shown) of the cylinder head cover 10 via a PCV valve 66.

  The intake system structure of the engine 2 is provided with an air cleaner 68 disposed above the engine 2 and the transmission 4. The air cleaner 68 includes an air cleaner case 70. As shown in FIGS. 4 to 8, the air cleaner case 70 includes a first case 72 constituting a dirty side and a second case 74 constituting a clean side. The first case 72 and the second case 74 are connected to a vehicle. It is divided in the horizontal direction which is the width direction.

  The first case 72 is formed in a substantially triangular box shape having a front side as a vertex, a rear side as a base, a left side as a vertical side, and a right side as a hypotenuse in plan view. The first case 72 is provided with a first filter chamber 76 therein, and is provided with a square frame-shaped first mating surface 78 opening toward the right side on the oblique side. The bottom surface of the first case 72 is provided with a first bulging portion 80 that extends downward from the upper end of the cylinder head cover 10 of the engine 2 when viewed from the front. An inlet-side opening 82 is provided on the bottom surface of the first bulging portion 80 on the first case 72 side. The entrance-side opening 82 is disposed on the rear side of the bottom surface of the first case 72.

  An inlet side intake passage 84 is connected to the inlet side opening 82 of the first case 72. As shown in FIG. 9, the inlet side intake passage 84 is formed by an inlet inlet portion 86, an inlet hose 88, and an inlet pipe 90, and is disposed below the first case 72. The inlet inlet portion 86 is disposed below an upper member (not shown) of the engine room, and a bracket 92 is attached to the upper member by a mounting bolt 94 via the bracket 92. The inlet hose 88 connects the inlet inlet 86 and the inlet pipe 90. The inlet pipe 90 is provided with an inlet side resonator 98.

  In the plan view, the second case 74 is inclined in the front-rear direction with the front side being a substantially straight portion extending along the longitudinal direction of the cylinder head cover 10 and the left side being coincident with the oblique side of the first case 72. Formed in a substantially trapezoidal box shape with the left oblique side, the rear oblique side inclined away from the oblique side so as to approach the front side as it approaches the right side, and the right side is a short side substantially perpendicular to the bottom side. . The second case 74 is provided with a second filter chamber 100 therein, and a quadrangular frame-shaped second mating surface 102 that opens toward the left side on the left oblique side.

  As described above, the second case 74 is formed so that the second mating surface 102 is inclined in the front-rear direction, the front side extends substantially linearly along the longitudinal direction of the cylinder head cover 10, and the rear side and the right side are the second side. It is formed in an inclined shape so as to approach the front side as the distance from the mating surface 102 increases.

  Similar to the first bulging portion 80 of the first case 72, a second bulging portion 104 extending downward is provided on the bottom surface of the second case 74. In the second case 74, an extended portion 106 is formed continuously to the second bulging portion 104 and extending toward the right side, which is the flow direction of intake air that has passed through a filter 114 described later. The expansion part 106 is disposed on the upper surface of the cylinder head cover 10. The second case 74 has a recess 108 formed along the cylinder head cover 10 on the lower surface of the extension portion 106.

  The air cleaner case 70 forms a mating surface portion 112 by engaging the first mating surface 78 of the first case 72 and the second mating surface 102 of the second case 74 and connecting them with a connector 110. In the air cleaner case 70, the mating surface portion 112 is disposed obliquely with respect to the left side surface facing the mating surface portion 110 on the first case 72 side above the transmission 4, and extends along the mating surface portion 112 in the vertical direction. The extracted filter 114 is disposed obliquely.

  Thus, as shown in FIGS. 1 and 4, the air cleaner case 70 has the mating surface portion 112 and the filter 114 arranged obliquely above the transmission 4 so that the rear side is closer to the engine 2 than the front side in plan view. Has been established.

  Further, the second case 74 is provided with a second case side opening 116 on the rear surface. The second case side opening 116 is disposed substantially in line with the tank side opening 40 provided on the front surface of the surge tank 20, and is connected to one end of the linear outlet hose 118. The outlet hose 118 forms an outlet side intake passage 120, and the other end side is connected to the body passage 48 of the throttle body 42.

  As a result, the second case side opening 116 of the second case 74 is straight to the tank side opening 40 of the surge tank 20 via the outlet side intake passage 120 of the outlet hose 118 and the body passage 48 of the throttle body 42. Connected.

  Further, the second case 74 has a hose connection portion 122 on the rear surface, a sensor attachment portion 124 on the upper surface, and a case attachment portion 126 on the front surface. One end side of the breather hose 128 is connected to the hose connection part 122. The other end of the breather hose 128 is connected to a breather chamber (not shown) of the cylinder head cover 10. An intake air temperature sensor 130 is attached to the sensor attachment portion 124. In the second case 74, the case attaching portion 126 is attached to the cylinder head cover 10 by the attaching bolt 132.

  The air cleaner 68 is integrally provided with a resonator 134 continuously with the second case 74. In the second case 74, a square frame plate-shaped cleaner-side flange 136 is provided on the outer periphery of the right side of the extended portion 106 facing the second mating surface 102. The resonator 134 includes a resonator case 138.

  The resonator case 138 is formed to extend to the oil filler cap 16 provided on the front side of the upper surface of the cylinder head cover 10 and on the chain cover 14 side, and on the front side and the chain cover 14 side so as to avoid interference with the oil filler cap 16. A recess 140 is formed on the surface. The resonator case 138 has a resonator chamber 142 therein, a square frame plate-shaped resonator-side flange 144 around the opening opening toward the left side, and a resonator-side connection portion 146 on the rear surface.

  The resonator 134 is integrally formed by welding the resonator side flange 144 of the resonator case 138 to the cleaner side flange 136 of the second case 74.

  As a result, the second case 74 and the resonator case 138 are formed in a substantially triangular shape having the front surface as the bottom, the second mating surface 102 as the short side, and the rear surface as the long side.

  In the resonator case 138, one end side of the resonator hose 148 is connected to the resonator-side connecting portion 146 on the rear surface. The resonator hose 148 forms a hose passage 150 and is connected to a tank side connection portion 60 on the front surface of the extension portion 56 formed by extending the other end side to the chain cover 14 side of the surge tank 20.

  Thereby, the surge tank 20 and the resonator 134 are communicated with each other via the resonator hose 148.

  Next, the operation of this embodiment will be described.

  The intake system structure of the engine 2 is such that the engine 2 and the transmission 4 are arranged side by side in the width direction of the vehicle, and the intake air taken in from the inlet side intake passage 84 is provided by a filter 114 built in an air cleaner 68 mounted in the engine 2. It is filtered and flows into the surge tank 20 through the outlet side intake passage 120. The intake air of the surge tank 20 is supplied to each combustion chamber (not shown) of the engine 2 via the branch pipe 22.

  The intake system structure of the engine 2 includes an air cleaner case 70 divided in the left-right direction of the vehicle, and includes a first case 72 and a second case 74 in which a filter 114 extending in the vertical direction requiring the most space is disposed. By arranging the mating surface portion 112 obliquely using the space above the transmission 4, a sufficient space for protecting pedestrians is provided between the hood (not shown) covering the engine room and the air cleaner 68. The air cleaner case 70 can be disposed on the upper surface of the engine 2 while ensuring.

  Further, in the intake system structure of the engine 2, the mating surface portion 112 of the first case 72 and the second case 74 is disposed obliquely with respect to the side surface on the first case 72 side facing the mating surface portion 112. In addition, the filtration area of the filter 114 disposed along the mating surface portion 112 can be increased, the passage resistance of the intake air taken in from the inlet side intake passage 84 can be reduced, and the filtration efficiency can be improved.

  Further, in the intake system structure of the engine 2, the lower surface of the second case 74 has a recess 108 formed along the cylinder head cover 10, so that an air cleaner case 70 is secured while ensuring a sufficient space for pedestrian protection. Can be disposed on the upper surface of the engine 2.

  In the intake system structure of the engine 2, an inlet-side opening 82 is disposed on the rear side of the bottom surface of the first case 72, and the mating surface portion 112 and the filter 114 are arranged such that the rear side is closer to the engine 2 than the front side. Since the surge tank 20 is disposed obliquely above the cylinder 4 and on the rear side of the cylinder head 8 of the engine 2, the intake air that has passed through the obliquely disposed filter 114 flows toward the front side. Since the extended portion 106 of the second case 74 extends mainly on the front side of the upper surface of the cylinder head cover 10, an outlet side intake passage 120 that connects the throttle body 42 that communicates with the surge tank 20 and the air cleaner 68 is disposed. The space can appear on the rear side of the upper surface of the cylinder head cover 10.

  Further, in the intake system structure of the engine 2, the second case side opening 114 provided on the rear surface of the second case 74 and the tank side opening 40 provided on the front surface of the surge tank 20 are arranged in a substantially straight line. By providing, passage resistance can further be reduced.

  Further, in the intake system structure of the engine 2, the inlet side intake passage 84 is disposed below the first case 72, so that the inlet side intake passage 84 is disposed using the dead space above the transmission 4. And layout can be improved.

  The present invention is not limited to the above-described embodiments, and various application modifications can be made.

  For example, FIG. 10 shows a modification of the intake system structure of the engine 2. In the intake system structure of the engine 2, the filter 114 does not extend in the vertical direction with respect to the mating surface portion 112 of the first case 72 and the second case 74, but extends in the upper left direction and the lower right direction in a front view. These are arranged obliquely with respect to the vertical direction.

  In the intake system structure of the engine 2, the filter 114 is arranged obliquely with respect to the mating surface portion 112 of the first case 72 and the second case 74 with respect to the vertical direction, thereby increasing the filtration area of the filter 114. The intake-side intake passage 84 to which the inlet-side intake passage 84 is connected is introduced into the first filter chamber 76, and the passage resistance of the intake air flowing into the second filter chamber 100 can be reduced. Can be improved.

  FIG. 11 shows another modification of the intake system structure of the engine 2. The intake system structure of the engine 2 has a plurality of directions for deflecting the flow direction of the intake air toward the filter 114 in the flow region 152 of the intake air flowing into the first filter chamber 76 of the first case 72 from the inlet side opening 82. A guide plate 154 is provided. The plurality of guide plates 154 are arranged such that one end side is aligned with the side facing the filter 114 at equal intervals, and the other end side is extended so as to become longer away from the filter 114 as it is separated from the inlet side opening 82. It is formed so as to be bent toward the inlet side opening 82 while being taken out.

  The intake system structure of the engine 2 is arranged such that one end side is aligned with the side facing the filter 114 at equal intervals, and the other end side becomes longer toward the side away from the filter 114 as the distance from the inlet opening 82 increases. The plurality of guide plates 154 that are curved so as to be directed toward the inlet side opening 82 while being extended allow the intake air flowing into the first filter chamber 76 from the inlet side opening 82 of the first case 72 to be filtered by the filter 114. Can be evenly distributed and circulated toward the entire surface of the filter, and the intake surface can be filtered by effectively using the entire surface of the filter 114, and is taken into the first filter chamber 76 from the inlet side opening 82, The passage resistance of the intake air flowing into the second filter chamber 100 can be reduced, and the filtration efficiency can be improved.

  The intake system structure of the engine of the present invention can arrange an air cleaner case on the upper surface of the engine while ensuring a sufficient space for protecting pedestrians between the hood and the air cleaner that covers the engine room of the vehicle. Further, the filter area of the filter can be increased, the passage resistance of the intake air can be reduced, and the filtration efficiency can be improved. Not only a vehicle equipped with an engine as a drive source but also an engine and a drive source. It can also be applied to a hybrid vehicle equipped with an electric motor.

It is a top view of the intake system structure of the engine which shows an Example. It is a front view of the intake system structure of an engine. It is a left view of the intake system structure of an engine. It is a top view of an air cleaner. It is a front view of an air cleaner. It is a bottom view of an air cleaner. It is a left view of an air cleaner. It is a right view of an air cleaner. It is a perspective view which shows the assembly state of the intake system structure of an engine. It is a principal part expanded sectional view of the air cleaner which shows a modification. It is a principal part expanded sectional view of the air cleaner which shows another modification.

Explanation of symbols

2 Engine 4 Transmission 8 Cylinder head 10 Cylinder head cover 14 Chain cover 18 Intake manifold 20 Surge tank 42 Throttle body 68 Air cleaner 70 Air cleaner case 72 First case 74 Second case 78 First mating surface 80 First bulging portion 82 Inlet side Opening portion 84 Inlet side intake passage 102 Second mating surface 104 Second bulging portion 106 Expansion portion 112 Matching surface portion 114 Filter 116 Second case side opening portion 120 Outlet side intake passage 134 Resonator 138 Resonator case 148 Resonator hose

Claims (5)

  An engine intake system structure in which an engine and a transmission are arranged side by side in a vehicle width direction, and intake air taken from an inlet side intake passage is filtered by an air cleaner mounted on the engine and flows into a surge tank. Comprises an air cleaner case composed of a first case constituting the dirty side and a second case constituting the clean side, and the first case and the second case are divided in the left-right direction of the vehicle. The mating surface portion with the two cases is disposed obliquely with respect to the side surface facing the mating surface portion on the first case side above the transmission, and the engine is disposed between the bottom surface of the first case and the bottom surface of the second case. An inlet provided with a bulging portion extending downward from the upper end of the cylinder head cover and connected to the inlet side intake passage on the bottom surface of the bulging portion on the first case side An opening is provided, and a filter extending in the vertical direction along the mating surface is disposed obliquely, and extends in the flow direction of the intake air passing through the filter continuously to the bulging portion on the second case side. An engine intake system structure characterized in that an extended portion to be formed is formed in a second case, and the extended portion of the second case is disposed on an upper surface of a cylinder head cover.   An engine intake system structure in which an engine and a transmission are arranged side by side in a vehicle width direction, and intake air taken from an inlet side intake passage is filtered by an air cleaner mounted on the engine and flows into a surge tank. Comprises an air cleaner case composed of a first case constituting the dirty side and a second case constituting the clean side, and the first case and the second case are divided in the left-right direction of the vehicle. The mating surface portion with the two cases is disposed obliquely with respect to the side surface facing the mating surface portion on the first case side above the transmission, and is connected to the inlet side intake passage on the bottom surface on the first case side. An inlet-side opening is provided, and a filter extending in the vertical direction on the mating surface is disposed obliquely with respect to the side surface of the first case, and the second case An engine characterized in that an extended portion is provided by extending downstream from the mating surface portion, and the extended portion is disposed on the upper surface of the engine and has a recess formed along the cylinder head cover on the lower surface of the extended portion. Intake system structure.   The inlet side opening is disposed on the rear side of the bottom surface of the first case, and the mating surface portion and the filter are disposed obliquely above the transmission so that the rear side is closer to the engine than the front side, The engine intake system structure according to claim 1 or 2, wherein a surge tank is disposed on a rear side of the cylinder head of the engine.   3. The engine according to claim 1, wherein an opening provided on a rear surface of the second case and an opening provided on a front surface of the surge tank are arranged substantially in a straight line. Intake system structure.   The engine intake system structure according to claim 1 or 2, wherein the inlet side intake passage is disposed below the first case.

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