JP2005061337A - Intake system structure for engine with turbo charger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate a layout of an intake system passage for a turbo charger without interfering with a car body frame or an engine mount. <P>SOLUTION: An outlet part of a compressor housing is provided upward on a side surface on the car body frame side. A curvature part is provided in a turbo outlet pipe connected to the outlet part at an upper part of the car body frame. A turbo outlet hose communicated with an outlet part of the turbo outlet pipe is extended along the car body frame above the car body frame. An inlet part of a turbo inlet pipe is provided in a side surface in a crossing direction with the car body frame. An outlet part is provided under the inlet part. The inlet part and the outlet part are disposed in the same direction through the curvature part in the turbo inlet pipe. An outlet part of a compressor housing is disposed between the inlet part and the outlet part of the turbo inlet pipe in a vertical direction. An air bypass passage for release of excess air is provided on the lower side of the turbo outlet pipe. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an intake system structure of an engine with a turbocharger, and more particularly to a vehicle body frame and an engine mount attached to the vehicle body frame even when an intake system passage of the turbocharger is disposed in a narrow engine room disposed under a seat. It is related with the intake system structure of the engine with a turbocharger which can make the layout of the intake system passage of a turbocharger easy without interfering with.

  In a vehicle in which an engine is mounted under a seat or a floor, a system in which the engine is mounted with an inclination is employed in order to secure a vehicle interior space.

  In addition, some tilting engines mounted on a vehicle are equipped with a turbocharger in order to improve output.

JP 2003-74433 A

  By the way, in the conventional intake system structure of an engine with a turbocharger, the turbocharger 116 is located between the tilt engine 106 and the first left body frame 104-1 of the body frame 104, as shown in FIGS. .

  As shown in FIGS. 7 to 11, the turbocharger 116 has a turbo inlet pipe 122 attached to an inlet portion 120 formed of an inlet flange of a compressor housing 118 which is a component, and fresh air from an air cleaner (not shown) is supplied to the compressor. It is introduced into the housing 118.

  An air bypass valve 138 is attached to the turbo inlet pipe 122. The air bypass valve 138 is connected to the turbo outlet pipe 130 through an air bypass passage 136 that releases supercharged air.

  The air bypass valve 138 has a function of opening under a specific condition and releasing the supercharged air in the downstream pipe of the turbo outlet pipe 130 to the turbo inlet pipe 122 side.

  As shown in FIGS. 7 to 12, the outlet portion 124 formed of the outlet flange of the compressor housing 118 has a structure directed to the lower side of the first left body frame 104-1 of the body frame 104. The turbo outlet pipe 130 is attached to the outlet portion 124 of the housing 118, and the supercharged air supercharged in the compressor housing 118 is discharged.

  As shown in FIGS. 7 and 8, a turbo outlet hose 126-1 constituting an intercooler inlet side passage 126 and a downstream side of the turbo outlet hose 126-1 are connected to the downstream side of the turbo outlet pipe 130. The air outlet pipe 126-2 is connected, and the air outlet pipe 126-2 located on the downstream side is connected to an intercooler (not shown) disposed in front of the vehicle (not shown).

  However, because of the relationship with the vehicle body frame 104, the outlet portion 124 formed of the outlet flange of the turbocharger 116 is directed to the lower side of the first left vehicle body frame 104-1 of the vehicle body frame 104 as shown in FIGS. Therefore, the turbo outlet hose 126-1 becomes a pipe that passes under the first left body frame 104-1 of the body frame 104.

  As a result, in order to avoid the engine mount 108 disposed below the first left body frame 104-1, the body frame 104 is surrounded by the engine mount 108 below the first left body frame 104-1. After extending outward, the propeller shaft at approximately the same height as the vehicle body frame 104 should be protruded upward in front of the tilt engine 106 as much as possible, and the piping must be curved, resulting in a complicated and long piping. As a result, engine intake response and ventilation resistance are deteriorated, resulting in performance deterioration, and inconvenience that each part is costly due to complicated and long piping.

  Therefore, in order to eliminate the inconvenience described above, the present invention tilts the engine, supports the tilted engine on the vehicle body frame via an engine mount attached to the lower side of the vehicle body frame, and arranges it under the seat. An outlet portion of an air cleaner outlet side passage is disposed between the vehicle body frame and the inclined engine, and the outlet portion of the air cleaner outlet side passage and the inlet portion of the compressor housing of the turbocharger are connected via a turbo inlet pipe. In addition, in an intake system structure of an engine with a turbocharger in which the outlet portion of the compressor housing and the inlet portion of the intercooler inlet side passage are connected via a turbo outlet pipe, the outlet portion of the compressor housing faces upward on the side surface on the body frame side Of this compressor housing A curved portion is provided in the turbo outlet pipe connected to the outlet portion of the compressor housing and an opening is provided above the vehicle body frame, and the intercooler inlet side passage connected to the outlet portion of the turbo outlet pipe is provided. The turbo outlet hose is configured to extend along the body frame above the body frame.

  Also, the inlet portion of the turbo inlet pipe is provided on the side surface in the direction intersecting with the vehicle body frame, the outlet portion of the turbo inlet pipe is provided below the inlet portion of the turbo inlet pipe, and the curved portion provided in the turbo inlet pipe The inlet and outlet of the turbo inlet pipe are arranged in the same direction, the outlet of the compressor housing is arranged between the inlet and outlet of the turbo inlet pipe in the vertical direction, and the turbo outlet pipe An air bypass passage for releasing the supercharged air is provided on the lower side.

  As described above in detail, according to the present invention, the engine is tilted, and the tilted engine is supported on the vehicle body frame via the engine mount attached to the lower side of the vehicle body frame and disposed under the seat, and the air cleaner outlet. The outlet portion of the side passage is disposed between the vehicle body frame and the tilt engine, and the outlet portion of the air cleaner outlet side passage and the inlet portion of the compressor housing of the turbocharger are connected via a turbo inlet pipe and the outlet of the compressor housing In the intake system structure of the turbocharged engine in which the inlet portion of the intercooler inlet side passage is connected via a turbo outlet pipe, the outlet portion of the compressor housing is provided upward on the side surface on the vehicle body frame side. The exit is located above the body frame In addition, a curved portion is provided in the turbo outlet pipe connected to the outlet portion of the compressor housing, and the turbo outlet hose constituting the intercooler inlet side passage connected to the outlet portion of the turbo outlet pipe is disposed above the vehicle body frame. Since it extends along the frame, it interferes with the body frame and the engine mount attached to the body frame even when the intake system passage of the turbocharger is disposed in a narrow engine room disposed under the seat. In addition, since there is a large space above the body frame, the layout of the intake system passage of the turbocharger is facilitated.

  Also, the inlet portion of the turbo inlet pipe is provided on the side surface in the direction intersecting the vehicle body frame, the outlet portion of the turbo inlet pipe is provided below the inlet portion of the turbo inlet pipe, and the turbo inlet is connected via a curved portion provided in the turbo inlet pipe. The inlet and outlet of the pipe are arranged in the same direction, and the outlet of the compressor housing is arranged between the inlet and outlet of the turbo inlet pipe in the vertical direction, and passes below the turbo outlet pipe. Since the air bypass passage for releasing the supply air is provided, the air bypass passage can be formed compactly.

  By inventing as described above, the outlet portion of the compressor housing provided upward on the side surface on the vehicle body frame side is disposed above the vehicle body frame, and the curved portion is provided in the turbo outlet pipe connected to the outlet portion of the compressor housing, A turbo outlet hose constituting an intercooler inlet-side passage communicated with the outlet of the turbo outlet pipe is extended along the vehicle body frame above the vehicle body frame, and the turbocharger is installed in a narrow engine room disposed under the seat. Even when the intake system passage is provided, the layout of the intake system passage of the turbocharger is facilitated by the wide space above the body frame without interfering with the body frame and the engine mount attached to the body frame.

  In addition, an outlet portion of the turbo inlet pipe is provided below the inlet portion of the turbo inlet pipe provided on the side surface in the direction intersecting with the vehicle body frame, and the inlet portion and the outlet portion of the turbo inlet pipe are provided via a curved portion provided in the turbo inlet pipe. Are arranged in the same direction, the outlet of the compressor housing is arranged between the inlet and outlet of the turbo inlet pipe in the vertical direction, and the air bypass that opens the supercharged air to the lower side of the turbo outlet pipe A passage is provided, and the air bypass passage is compactly formed.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  1 to 6 show an embodiment of the present invention. 1 to 6, 2 is a vehicle, 4 is a body frame composed of side frames, and 6 is a tilt engine.

  The tilt engine 6 includes a first left engine mount 8-1 that is an engine mount 8 that is attached to a lower surface of a first left vehicle body frame 4-1, which is a vehicle body frame 4 extending in the front-rear direction on both left and right sides of the vehicle 2. It is supported via a second right engine mount 8-2, which is an engine mount 8 attached to the lower surface of the second right body frame 4-2, and is disposed under the seat 10.

  Further, as shown in FIGS. 1 and 2, an outlet portion 14 of the air cleaner outlet side passage 12 is disposed between the first left side body frame 4-1 of the body frame 4 and the tilt engine 6.

  The outlet portion 14 of the air cleaner outlet side passage 12 and the inlet portion 20 formed of the inlet flange of the compressor housing 18 of the turbocharger 16 are provided in communication with each other via a turbo inlet pipe 22 as shown in FIGS. The outlet portion 24 formed of the outlet flange of the compressor housing 18 and the inlet portion 28 of the intercooler inlet side passage 26 are provided in communication with each other via a turbo outlet pipe 30.

  At this time, the intercooler inlet-side passage 26 communicates with an upstream turbo outlet hose 26-1 communicating with the turbo outlet pipe 30 and a downstream side of the turbo outlet hose 26-1, and the vehicle body of the vehicle 2 The air outlet pipe 26-2 communicates with an intercooler (not shown) located in front.

  An outlet 24 of the compressor housing 18 is provided upward on the side surface of the vehicle body frame 4 on the first left vehicle body frame 4-1 side as shown in FIGS. 1, 2, 5, and 6. The outlet portion 24 of the housing 18 is disposed above the first left body frame 4-1 of the vehicle body frame 4, and the turbo outlet pipe 30 connected to the outlet portion 24 of the compressor housing 18 is connected to the turbo outlet pipe 30 shown in FIGS. As shown in FIG. 1, a turbo outlet hose 26-1 which is provided with a curved portion 32 and constitutes a part of the intercooler inlet side passage 26 communicated with the turbo outlet pipe 30 is connected to the vehicle body frame as shown in FIG. 4 above the first left body frame 4-1.

  More specifically, the compressor housing 18 of the turbocharger 16 is disposed at substantially the same height as the vehicle body frame 4 on the inclined lower side (lower right side in FIG. 1) of the inclined engine 6 as shown in FIG. To do.

  Further, the turbo outlet pipe 30 and the turbo outlet hose 26-1 are connected to a cylinder head cover 6-1 of the tilt engine 6 and a first left body frame 4-1 of the body frame 4 as shown in FIG. Arranged between.

  As shown in FIGS. 1 and 2, the turbo inlet pipe 22 and the turbo outlet pipe 30 are disposed adjacent to each other along the first left body frame 4-1 of the body frame 4.

  Further, the inlet portion 22-1 of the turbo inlet pipe 22 is provided in the direction intersecting the vehicle body frame 4, that is, on the side surface in the left-right direction in FIG. 2, and the inlet portion 22 of this turbo inlet pipe 22 as shown in FIGS. -1 is provided with an outlet portion 22-2 of the turbo inlet pipe 22, and an inlet portion 22- of the turbo inlet pipe 22 is provided through a curved portion 34 provided in the turbo inlet pipe 22 as shown in FIGS. 1 and the outlet portion 22-2 are arranged in the same direction.

  The outlet 24 of the compressor housing 18 is disposed between the inlet 22-1 and the outlet 22-2 of the turbo inlet pipe 22 in the vertical direction as shown in FIGS. As shown in FIGS. 3 to 5, an air bypass passage 36 for releasing supercharged air is provided below the pipe 30.

  Furthermore, an air bypass valve 38 for opening and closing the air bypass passage 36 is provided outside the curved portion 34 of the turbo inlet pipe 22, as shown in FIGS. It arrange | positions so that it may correspond with the longitudinal direction of the vehicle body frame 4, and is arrange | positioned between the said turbo outlet pipe 30 and the inclination engine 6, as shown in FIG.

  As shown in FIGS. 1 and 2, the tilt engine 6 is arranged vertically, and the turbo outlet pipe 30 is arranged along the first left body frame 4-1 of the body frame 4 composed of a side frame. As shown in FIGS. 1 and 2, the turbo outlet pipe 30 and the hose connected to the turbo outlet pipe 30, that is, the turbo outlet hose 26-1 constituting a part of the intercooler inlet side passage 26, A propeller shaft 40 on the front wheel side for four-wheel drive is disposed below the turbo outlet pipe 30 or the turbo outlet hose 26-1, and is disposed obliquely along the lower edge of the front cylinder head cover 6-1 and the chain cover. Arrange.

  That is, the central portion of the inlet portion 28 of the turbo outlet hose 26-1 that constitutes a part of the intercooler inlet side passage 26 is the upper portion of the first left body frame 4-1 of the body frame 4 as shown in FIG. From the side of the first left body frame 4-1 of the vehicle body frame 4, and at a position separated from the side of the tilt engine 6 by the distance b.

  Reference numeral 42 denotes an engine room formed under the seat 10.

  Next, the operation will be described.

  A first left engine mount 8-1 that is an engine mount 8 that is attached to a lower surface of a first left vehicle body frame 4-1, which is a vehicle body frame 4 extending in the front-rear direction on both left and right sides of the vehicle 2, and a second right vehicle body frame 4. -2 supports the tilt engine 6 via a second right engine mount 8-2, which is an engine mount 8 attached to the lower surface of the -2, and vertically mounts the tilt engine 6 under the seat 10 as shown in FIG. Mount in state.

  When the tilt engine 6 is mounted on the vehicle 2 in a vertically placed state, as shown in FIG. 2, the air cleaner exit extends in the direction intersecting with the vehicle body frame 4 on the rear side of the tilt engine 6, that is, in the left-right direction in FIG. A passage 12 is provided, and an intermediate portion of the air cleaner outlet passage 12 is curved in the vicinity of the first left body frame 4-1 of the vehicle body frame 4, and an air cleaner outlet passage is formed at an inner portion of the first left body frame 4-1. Twelve outlet portions 14 are directed forward.

  An inlet portion 22-1 of the turbo inlet pipe 22 is connected to the outlet portion 14 of the air cleaner outlet passage 12, and an outlet portion of the turbo inlet pipe 22 is formed by a curved portion 34 formed at an intermediate portion of the turbo inlet pipe 22. 22-2 is oriented in the same direction as the inlet 22-1.

  As shown in FIGS. 1, 4, and 6, the outlet portion 22-2 of the turbo inlet pipe 22 is connected to the compressor housing 18 of the turbocharger 16 through an inlet portion 20 formed of an inlet flange.

  Then, the outlet portion 24 formed of the outlet flange of the compressor housing 18 is connected to the inlet portion 28 of the intercooler inlet-side passage 26 via the turbo outlet pipe 30 as shown in FIGS.

  At this time, the outlet 24 formed of the outlet flange of the compressor housing 18 is obliquely above the compressor housing 18, that is, above the first left body frame 4-1 of the body frame 4, as shown in FIGS. 3 to 6. Oriented.

  The turbo outlet pipe 30 connected to the outlet portion 24 formed of the outlet flange of the compressor housing 18 is curved at a position above the first left body frame 4-1 of the body frame 4 as shown in FIGS. 2, 3, and 5. It is curved by the portion 32 and extends in a horizontal state in front of the vehicle 2.

  As shown in FIGS. 1 and 2, the turbo outlet hose 26-1 of the intercooler inlet-side passage 26 that communicates with the downstream side of the turbo outlet pipe 30 is connected to the first left side vehicle body of the vehicle body frame 4 in front of the vehicle 2. It extends along the frame 4-1, curves toward the center of the vehicle in front of the tilt engine 6, crosses over the propeller shaft 40 on the front wheel side for four-wheel drive, and is downstream of the turbo outlet hose 26-1 at this point. The air outlet pipe 26-2 communicates with an intercooler disposed at the front of the vehicle 2.

  An air bypass passage 36 is disposed below the turbo outlet hose 26-1 toward the front of the tilt engine 6 as shown in FIG.

  At this time, the turbo outlet pipe 30 connecting the compressor housing 18 of the turbocharger 16 and the intercooler, the turbo outlet hose 26-1 of the intercooler inlet side passage 26, and the air outlet pipe 26-2 are driven by the four-wheel drive. The air bypass passage 36 is shortened and formed short without interfering with the front wheel side propeller shaft 40.

  Thus, the compressor housing 18 is positioned above the vehicle body frame 4 on the side surface on the vehicle body frame 4 side and is provided with an upward outlet 24 so that the narrow engine room 42 disposed under the seat 10 Even when the intake system passage of the turbocharger 16 is provided, it interferes with the vehicle body frame 4 and the first left engine mount 8-1 and the second right engine mount 8-2 which are engine mounts 8 attached to the vehicle body frame 4. In addition, since there is a large space above the vehicle body frame 4, the layout of the intake system passage of the turbocharger 16 is facilitated.

  In addition, the compressor housing 18 of the turbocharger 16 is disposed at the same level as the vehicle body frame 4 on the lower tilt side (lower right side in FIG. 1) of the tilt engine 6, thereby lowering the seat 10. In the case where the tilt engine 6 is disposed, the space on the side of the vehicle body frame 4 can be effectively used, which is practically advantageous.

  Further, the turbo outlet pipe 30 and the turbo outlet hose 26-1 are disposed between the cylinder head cover 6-1 of the inclined engine 6 and the first left body frame 4-1 of the body frame 4. Thus, the tilt engine 6 can be attached from below through the body frame 4, and the assemblability can be improved.

  Furthermore, the turbo inlet pipe 22 and the turbo outlet pipe 30 are disposed adjacent to each other along the first left body frame 4-1 of the body frame 4, so that the piping of the turbocharger 16 can be made compact. The space around the turbocharger 16 can be effectively used, which is practically advantageous.

  Further, the inlet portion 22-1 of the turbo inlet pipe 22 is provided in a direction intersecting with the vehicle body frame 4, that is, in a lateral direction in FIG. 2, and the turbo inlet pipe 22 is provided below the inlet portion 22-1 of the turbo inlet pipe 22. The inlet portion 22-1 and the outlet portion 22-2 of the turbo inlet pipe 22 are arranged in the same direction via a curved portion 34 provided in the turbo inlet pipe 22, and the compressor An outlet portion 24 of the housing 18 is disposed between the inlet portion 22-1 and the outlet portion 22-2 of the turbo inlet pipe 22 in the vertical direction, and supercharged air is supplied to the lower side of the turbo outlet pipe 30. By providing the open air bypass passage 36, the air bypass passage 36 can be formed compactly.

  Further, an air bypass valve 38 for opening and closing the air bypass passage 36 is provided outside the curved portion 34 of the turbo inlet pipe 22, and the longitudinal direction of the air bypass valve 38 is made to coincide with the longitudinal direction of the vehicle body frame 4. The air bypass valve 38 is disposed by utilizing the surplus space between the turbo outlet pipe 30 and the inclined engine 6 by being disposed between the turbo outlet pipe 30 and the inclined engine 6. Is something that can be done.

  Furthermore, the tilt engine 6 is disposed vertically, and the turbo outlet pipe 30 is disposed along the first left body frame 4-1 of the body frame 4 including a side frame, and the turbo outlet pipe 30. And a hose connected to the turbo outlet pipe 30, that is, a turbo outlet hose 26-1 constituting a part of the intercooler inlet side passage 26 and an air outlet pipe 26-2 connected to the turbo outlet hose 26-1. Are disposed obliquely along the lower edge of the cylinder head cover 6-1 in front of the inclined engine 6 and the lower edge of the chain cover, and these turbo outlet hose 26-1 and air outlet pipe 26-2. By arranging the propeller shaft 40 on the front wheel side for four-wheel drive below the The propeller shaft 40 can be formed so that the overall length of the turbo outlet hose 26-1 and the air outlet pipe 26-2 constituting a part of the intercooler inlet side passage 26 can be shortened, and is disposed at substantially the same height as the side frame. Therefore, the turbo outlet hose 26-1 and the air outlet pipe 26-2 can be provided without providing a curved portion protruding upward.

  Further, as shown in FIGS. 1 and 2, the turbo outlet pipe 30 is routed so as to pass above the first left body frame 4-1 of the body frame 4. The dimension a is positioned above the first left body frame 4-1 of the body frame 4, and the dimension b can be reduced in the lateral direction, so that a lateral space can be secured, which is advantageous in terms of layout. In addition, hose piping can be shortened, and performance improvement effects such as responsiveness and cost reduction effects can be obtained.

  The present invention is not limited to the above-described embodiments, and various application modifications are possible.

  For example, in the embodiments of the present invention, a true-circular turbo outlet hose or turbo outlet pipe is described. However, the turbo outlet hose or turbo outlet pipe may have a special configuration having an oval cross section. is there.

  That is, the cross-sectional shape of the turbo outlet hose or the turbo outlet pipe is an elliptical cross-section that is long in the vertical direction and short in the left-right direction.

  In other words, if the cross-sectional shape of the turbo outlet hose or turbo outlet pipe is long in the vertical direction of the vehicle and short in the left-right direction of the vehicle, that is, in the width direction, the turbo outlet hose or the turbo outlet pipe is arranged. When installed, it is possible to improve the space efficiency in the width direction of the vehicle, which is practically advantageous.

It is a front view of the inclination engine mounted in the vehicle which shows the Example of this invention. It is a top view of the inclination engine mounted in the vehicle. It is a left view of the inclination engine mounted in the vehicle. It is a front view of a turbocharger part. It is a left view of a turbocharger part. It is a front view of the turbocharger part before mounting | wearing with a turbo inlet pipe, an air bypass valve, and an air bypass hose. It is a front view of the inclination engine mounted in the vehicle which shows the prior art of this invention. It is a top view of the inclination engine mounted in the vehicle. It is a left view of the inclination engine mounted in the vehicle. It is a front view of a turbocharger part. It is a left view of a turbocharger part. It is a front view of the turbocharger part before mounting | wearing with a turbo inlet pipe, an air bypass valve, and an air bypass hose.

Explanation of symbols

2 Vehicle 4 Body frame 4-1 First left body frame 4-2 Second right body frame 6 Inclined engine 6-1 Cylinder head cover 8 Engine mount 10 Seat 12 Air cleaner outlet side passage 14 Outlet portion 16 Turbocharger 18 Compressor housing 20 Inlet Part 22 Turbo inlet pipe 22-1 Inlet part 22-2 Outlet part 24 Outlet part 26 Intercooler inlet side passage 26-1 Turbo outlet hose 26-2 Air outlet pipe 28 Inlet part 30 Turbo outlet pipe 32 Curved part 34 Curved part 36 Air bypass passage 38 Air bypass valve 40 Front wheel propeller shaft for four-wheel drive 42 Engine room

Claims (7)

  The engine is inclined, and the inclined engine is supported on the vehicle body frame via an engine mount attached to the lower side of the vehicle body frame and disposed under the seat. The outlet portion of the air cleaner outlet side passage is inclined with the vehicle body frame and the vehicle body frame. An outlet portion of the air cleaner outlet side passage and an inlet portion of the compressor housing of the turbocharger are arranged between the engine and an inlet portion of the compressor housing of the turbocharger. In an intake system structure of an engine with a turbocharger that is connected to the vehicle through a turbo outlet pipe, the outlet portion of the compressor housing is provided upward on the side surface on the vehicle body frame side, and the outlet portion of the compressor housing is provided above the vehicle body frame. It is arranged in this The turbo outlet pipe connected to the outlet portion of the compressor housing is provided with a curved portion, and the turbo outlet hose constituting the intercooler inlet side passage communicated with the outlet portion of the turbo outlet pipe is disposed above the vehicle body frame. An intake system structure of a turbocharged engine characterized by extending along the line.   2. The intake system structure for an engine with a turbocharger according to claim 1, wherein the compressor housing of the turbocharger is disposed at substantially the same height as the vehicle body frame on the lower side of the inclination engine.   The intake system structure for an engine with a turbocharger according to claim 1, wherein the turbo outlet pipe and the turbo outlet hose are disposed between a cylinder head cover of the inclined engine and the vehicle body frame.   The intake system structure for an engine with a turbocharger according to claim 1, wherein the turbo inlet pipe and the turbo outlet pipe are disposed adjacent to each other along the vehicle body frame.   The inlet of the turbo inlet pipe is provided on the side surface in the direction intersecting with the vehicle body frame, the outlet of the turbo inlet pipe is provided below the inlet of the turbo inlet pipe, and the turbo inlet is connected to the turbo inlet through a curved portion provided in the turbo inlet pipe. An inlet portion and an outlet portion of the pipe are arranged in the same direction, and an outlet portion of the compressor housing is arranged between the inlet portion and the outlet portion of the turbo inlet pipe in the vertical direction, and the lower side of the turbo outlet pipe An intake system structure for an engine with a turbocharger, characterized in that an air bypass passage for releasing supercharged air is provided in the engine.   An air bypass valve that opens and closes the air bypass passage is provided outside the curved portion of the turbo inlet pipe, the longitudinal direction of the air bypass valve is arranged to coincide with the longitudinal direction of the vehicle body frame, and the turbo outlet pipe and the inclined engine The intake system structure for a turbocharged engine according to claim 5, wherein the intake system structure is disposed between the engine and the turbocharger. The inclined engine is disposed vertically, and the turbo outlet hose extends forward of the engine along a side frame that is the vehicle body frame and is curved inward of the engine room. The turbo outlet hose is a cylinder in front of the engine. 2. An intake system structure for an engine with a turbocharger according to claim 1, wherein a propeller shaft is disposed obliquely along a lower edge of the head cover and the chain cover, and a propeller shaft is disposed below the turbo outlet hose.

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