JP2006299852A - Engine with supercharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine with a supercharger making the engine sufficiently compact and preventing an intercooler from corroding due to condensed water. <P>SOLUTION: The supercharger 13 and the intercooler 14 to be positioned above the supercharger 13 are provided in a side of one side surface 1a of the engine 1. The intercooler 14 is arranged to be extended in an up and down direction and along one side surface 1a. Branched intake passages 10a connecting to each cylinder are branched from a downstream side tank part 14b positioned at an upper part. A delivery port of the supercharger 13 is positioned lower than an upstream side tank part 14b positioned at a lower part. An upstream side suction passage 10b is arranged to pass near the downstream side tank part 14b. The downstream side tank part 14b and an upstream side suction passage 10b are connected by a bypass passage 15 provided with a control valve 16 in a vicinity of the downstream side tank part 14b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a supercharged engine.

  Some engines adopt a mechanical supercharger (supercharger) driven mechanically by the engine from the viewpoint of responsiveness, etc., as a supercharger for supercharging intake air. In general, an intercooler for cooling the high-temperature intake air after being supercharged by the supercharger is also provided.

  In Patent Document 1, in a supercharged engine having a mechanical supercharger, an intercooler is disposed on the side of one side surface of the engine, and a tank portion formed at a lower end portion of the intercooler; A system in which a supercharger is disposed in a space between the one side surface is disclosed. Patent Document 1 also discloses that an intake passage on the downstream side of the intercooler and an intake passage on the upstream side of the supercharger are connected by a bypass passage in which the supercharger is bypassed and a control valve is provided. ing.

  In Patent Document 2, as in Patent Document 1, in a turbocharged engine having a mechanical supercharger, an intercooler is disposed on the side of one side surface of the engine, and a lower end portion of the intercooler is arranged. A turbocharger is disclosed in a space between the lower tank portion formed on the side and the one side surface. Patent Document 2 also discloses that an upper tank portion is integrally formed at the upper end portion of the intercooler, and an independent intake passage that is individually connected to each cylinder is branched from the upper tank portion. Has been.

JP-A-8-31475 JP-A-4-308320

  As described in Patent Document 1 and Patent Document 2, when an intercooler and a supercharger are disposed on the side of one side surface of the engine, the supercharger is connected to the intercooler (the lower end portion thereof) and the engine. Therefore, the intercooler must inevitably protrude from the one side of the engine, making it a compact engine as a whole. There is a problem in terms. In addition, moisture contained in the intake air may condense and stay in the lower position of the intercooler, and this moisture may corrode the interior of the intercooler. Will be.

  The present invention has been made in view of the above circumstances, and its purpose is to make it possible to make the engine more compact and to prevent the intercooler from being corroded by condensed moisture. It is to provide an engine with a feeder.

In order to achieve the above object, the following solution is adopted in the present invention. That is, as described in claim 1 in the claims,
A supercharger mechanically driven by the engine and an intercooler disposed downstream of the supercharger are disposed in the intake passage,
The intake passage has a branched intake passage connected to each cylinder of the engine independently in the downstream portion of the intercooler;
In an engine with a supercharger in which a control valve is provided in an intake passage and a bypass passage for bypassing the supercharger is provided,
The intercooler integrally includes an upstream tank portion and a downstream tank portion, and the branched intake passages are branched from the downstream tank portion;
One end of the bypass passage is connected to the downstream tank portion, and the other end of the bypass passage is connected to an upstream intake passage on the upstream side of the supercharger in the intake passage,
The supercharger and the intercooler are arranged on one side of the engine so that the intercooler is positioned above the supercharger;
The intercooler is arranged so as to extend substantially in the vertical direction so that the downstream tank portion is located above and the upstream tank portion is located below and substantially along the one side surface,
The supercharger is disposed at a low position of the engine so that the discharge port of the supercharger is at a position lower than the upstream tank portion;
The upstream intake passage is disposed so as to pass near the downstream tank portion, and the downstream tank portion and the upstream intake passage are connected by the bypass passage in the vicinity of the downstream tank portion. ,
It is like that.

  According to the above solution, since the supercharger and the intercooler are arranged in a positional relationship shifted in the vertical direction, the supercharger or the intercooler may protrude greatly to the side of the one side surface of the engine. The engine can be made more compact. In addition, the bypass passage only needs to be connected to the downstream tank section and the upstream intake passage, which are positioned close to each other, so that the length of the bypass passage can be shortened. The volume is reduced, which is preferable for improving transient response. Furthermore, since the upstream tank at the lower end of the intercooler is located higher than the discharge port of the supercharger, the water in the intake air condensed by the intercooler is discharged at the discharge port of the supercharger. It will be vaporized in the vicinity and supplied to the combustion chamber, preventing corrosion of the intercooler due to condensed water.

A preferred mode based on the above solution is as described in claim 2 and the following claims. That is,
The turbocharger is fixed to the engine cylinder block, and the downstream end of each branch intake passage is fixed to the engine cylinder head, so that the intercooler is connected to the turbocharger and each branch. It can be fixed to the engine via the intake passage (corresponding to claim 2). In this case, the installation of the intercooler to the engine can be easily performed using the attachment of each branch intake passage and the supercharger to the engine. In addition, the intercooler, each branch intake passage, and the supercharger can be made into one set (modularized) in advance and then assembled to the engine.

The supercharger is disposed at the front end position on the one end side in the crankshaft direction of the engine, and an auxiliary device driven by the engine is disposed above the supercharger,
The intercooler is disposed behind the auxiliary device;
(Claim 3). In this case, the auxiliary device and the intercooler are offset in the direction of the crankshaft, and the auxiliary device is preferably arranged for driving by effectively using the space above the supercharger. The engine can be made compact by avoiding interference.

  Another auxiliary device driven by the engine may be disposed below the supercharger (corresponding to claim 4). In this case, while obtaining the same effect as that of the third aspect of the invention, another auxiliary device can be provided by effectively using the space below the supercharger, and on the intake side of the engine. This is preferable in concentrating and arranging a plurality of auxiliary devices on the side surface side.

The turbocharger has an input portion for receiving a driving force from the engine located on a front end surface on one end side in the crankshaft direction of the engine, and a suction port located on a rear end surface. Placed on the bottom,
The upstream side intake passage extends downward from the vicinity of the rear end of the downstream side tank portion, and then extends forward in a space between the one side surface and the intercooler. Connected to the inlet of the
(Corresponding to claim 5). In this case, a more specific arrangement mode of the upstream intake passage is provided while specifying a specific arrangement mode of the input portion, the suction port, and the discharge port of the supercharger. The space between the one side surface and the intercooler can be used effectively.

  A throttle valve may be arranged in the upstream intake passage in the vicinity of the connection portion with the bypass passage and upstream of the connection portion (corresponding to claim 6). In this case, the bypass passage, the control valve, and the throttle valve can be concentrated in the vicinity of the downstream tank portion of the intercooler.

An air cleaner that filters the intake air introduced into the intake passage is disposed above the engine head.
The upstream intake passage extending from the air cleaner extends downward toward the supercharger after passing through the vicinity of the downstream tank portion.
(Corresponding to claim 7). In this case, an air cleaner is disposed on the engine head, and a suitable disposition mode is provided for downsizing the engine including the air cleaner.

  An intermediate intake passage portion that connects the upstream tank portion and the discharge port of the supercharger in the intake passage may be inclined so as to gradually become lower toward the discharge port. (Corresponding to claim 8). In this case, moisture condensed in the intercooler 14 is guided to the discharge port side of the supercharger, which is at a high temperature by using the inclination, which is preferable in performing more effectively than moisture vaporization. .

  The engine may be an automobile engine mounted in a horizontally placed state with the one side surface facing forward at the front of the vehicle body (corresponding to claim 9). In this case, the traveling wind can be effectively introduced for cooling the intercooler.

  According to the present invention, the engine can be made compact and the intercooler can be prevented from being corroded, and the bypass passage can be further shortened.

  FIG. 1 schematically shows an intake system of an engine. In FIG. 1, reference numeral 1 denotes a spark-ignition multi-cylinder reciprocating engine (engine body), which is a four-cylinder engine in the embodiment. In the intake passage 10 of the engine 1, in order from the upstream side to the downstream side, an air cleaner 11, a throttle body 12 incorporating a throttle valve 12 a, a supercharger 13 mechanically driven by the engine 1, an interface for cooling the intake air A cooler 14 is provided. A portion of the intake passage 10 downstream from the intercooler 14 is a branched intake passage 10a that is individually connected to each cylinder. Of the intake passage 10, an intake passage upstream of the supercharger 13 is indicated by reference numeral 10 b as an upstream intake passage. Further, in the intake passage 10, an intermediate intake passage connecting the supercharger 13 and the intercooler 14 (the upstream tank portion 14a thereof) is indicated by reference numeral 10c.

  The intercooler 14 integrally has an upstream tank portion 14a at its upstream end portion, and has a downstream tank portion 14b integrally at its downstream end portion. The downstream tank portion 14b has a large capacity and functions as a kind of surge tank. The branched intake passage 10a is branched directly from the downstream tank portion 14b, and the downstream tank portion 14b is formed of all cylinders. And the branched intake passage 10a. The Such a downstream tank portion 14 a and the upstream intake passage 10 b are connected by a bypass passage 15. The connection portion of the bypass passage 15 to the upstream intake passage 10b is the downstream side of the throttle valve 12a. In such a bypass passage 15, a valve body 16 incorporating a control valve 16a is disposed.

  2 to 4 show a specific arrangement relationship of each component shown in FIG. 1, and FIGS. 2 to 4 will be described below. 2 to 4 show the overall arrangement relationship including the engine 1, but it is made into one set centered on the supercharger 13, the intercooler 14 and the intake passage 10 excluding the engine 1. The arrangement relationship of the members is shown in FIGS. 5 to 8. FIGS. 2 to 4 will be described with reference to FIGS. 5 to 8 as appropriate. First, the engine 1 has a cylinder block 2, a cylinder head 3, a head cover 4, an oil pan 5, and the like as is known, and a crankshaft thereof is indicated by reference numeral 6. The devices driven by the crankshaft 6 include, in addition to the supercharger 13, an alternator 21 as a supplement, a water pump 22, an air conditioner compressor 23, and a power steering pump 24 (particularly FIG. 1). reference). That is, the drive belt 25 is wound around the drive pulley 6A fixed to the crankshaft 6, and this drive belt 25 is also wound around the driven pulleys 13A, 21A-24A of the devices 13, 21-24. Yes. In the driven pulley 13A for the supercharger 13, an electromagnetic clutch for switching the supercharger 13 on and off (drive and stop driving) is incorporated.

  Each of the devices 13 and 21 to 24 driven by the crankshaft 6 is positioned in the vicinity of the front end portion on one end side in the crankshaft direction. That is, the supercharger 13, the alternator 21, the water pump 22, and the compressor 23 are positioned on the side of the one side surface 1a of the engine 1 (cylinder block 2) and on the front end side of the engine 1, respectively. More specifically, the supercharger 13 is fixed to the lower end of the engine 1 (cylinder block 2), a water pump 22 is disposed above the supercharger 13, and an alternator 21 is disposed above the water pump 22. An air conditioning compressor 23 is disposed below the supercharger 13. The power steering pump 24 is disposed on the side of the other side surface of the engine. Of course, the axes of the various devices 13 and 21 to 24 driven by the crankshaft 6 extend so as to be parallel to the crankshaft 6. In the supercharger 13, the driven pulley 13 </ b> A serves as an input unit that receives the driving force from the engine 1, but the suction port 13 a is opened rearward on the rear surface of the supercharger 13, and the discharge port 13 b is excessive. The position is set to face downward on the bottom surface of the feeder 13.

  The intercooler 14 is positioned above the supercharger 13 on the one side surface 1 a side of the engine 1. More specifically, the intercooler 14 is disposed so as to extend substantially vertically along the one side surface 1a, the upstream tank portion 14a is positioned below, and the downstream tank portion 14b is positioned upward. Located in. The upstream tank portion 14a is positioned above the upper surface of the supercharger 13 so that the discharge port 13b of the supercharger 13 is sufficiently lower than the upstream tank portion 14a. It is set (see also FIGS. 5, 6, and 8). The various auxiliary devices 21 to 23 described above positioned on the one side surface 1a side of the engine 1 are positioned on the front side of the engine 1 relative to the intercooler 14, respectively (the auxiliary devices 21 to 23 and the intercooler 14 are connected to each other). The positional relationship is offset in the crankshaft direction).

  Of the intake passage 10, an intermediate intake passage 10 c that connects the supercharger 13 and the upstream tank portion 14 a of the intercooler 14 extends from the bottom surface of the supercharger 13 so as to cover the discharge port 13 b of the supercharger 13. After that, the turbocharger 13 is disposed along a side surface opposite to the one side surface 1a and connected to the upstream tank portion 14a. The maximum protrusion amount (maximum separation distance) from the one side surface 1a of the intermediate intake passage 10c is set to be as small as possible, and the maximum protrusion amount (maximum separation distance) from the one side surface 1a of the intercooler 14 is set to be as small as possible. It is almost the same as the largest part. As shown in FIGS. 3 and 8, the bottom surface of the portion of the intermediate intake passage 10 c located immediately below the upstream tank portion 14 a gradually decreases toward the discharge port 13 b of the supercharger 13. The inclination is set as follows (this inclined surface is indicated by reference numeral 31). As a result, moisture in the intake air condensed in the intercooler 14 is guided to the discharge port 13b side of the supercharger 13 through the inclined surface 31 of the intermediate intake passage 10c, and the condensed moisture becomes high temperature. The gas is effectively vaporized in the vicinity of the discharge port 13 b of the supercharger 13. The intermediate intake passage 10c is divided into a passage portion having an inclined surface 31 and a passage portion formed so as to cover the discharge port 13b of the supercharger 13, and is connected to an intake system engine 1 to be described later. The assembly is good.

  Of the intake passage 10, the upstream intake passage 10 b has an upstream end connected to the lower surface of an air cleaner 11 disposed above the head of the engine 1. That is, as shown in FIG. 3, the air cleaner 11 extends long in the front-rear direction of the engine 1, and a suction duct 30 for introducing air into the air cleaner 11 is connected to the lower surface of the rear end of the air cleaner 11. In the vicinity of the suction duct 30, the upstream end of the upstream intake passage 10b is connected. The connection portion between the suction duct 30 and the upstream intake passage 10b with respect to the air cleaner 11 is located at a position behind the intercooler 14 (on the rear end side in the crankshaft direction) and slightly higher than the downstream tank portion 14b. Yes.

  The upstream side intake passage 10b extending from the air cleaner 11 extends downward once behind the intercooler 14 so as to pass through the vicinity of the downstream side tank part 14b, and then forwards from a position slightly lower than the upstream side tank part 14a. And is connected to the suction port 13a of the supercharger 13 (see also FIGS. 5 to 8). More specifically, the upstream intake passage 10b is disposed so as to be positioned in a space (gap) between the intercooler 14 and the one side surface 1a when viewed from the crankshaft direction. The upstream intake passage 10b and the downstream tank portion 14b are close to each other, but are connected to each other by a short bypass passage 15 at the approaching portion. That is, the bypass passage 15 extends shortly backward from the downstream tank portion 14b, then extends downward, then extends short toward the one side surface 1a, and is connected to the side surface of the upstream intake passage 10b. Yes. The valve body 16 incorporating the control valve 16a is arranged at a bent portion between a portion extending backward and a portion extending downward of the bypass passage 15, and a throttle valve 12a is incorporated near the one side surface 1a of the valve body 16. A throttle body 12 is provided. The throttle body 12 is positioned slightly above (upstream side) the connection portion between the upstream intake passage 10 b and the bypass passage 15. In this way, the throttle valve 12a and the control valve 16a are disposed at positions close to each other, and a negative pressure pipe (in the case of a negative pressure operation type) or an electric wiring (in the case of a motor drive type) for the operation thereof. It is easy to handle.

  As shown in FIGS. 5 to 8, the supercharger 13, the intercooler 14, and the intake passage 10 are integrated (modulated) in advance including the throttle body 12 and the valve body 16, and are retrofitted to the engine 1. It is designed to be incorporated. In this case, the downstream end of the branch intake passage 10a is fixed to the cylinder head 3 and the supercharger 13 is fixed to the cylinder block 2. However, the intercooler 14 is not directly fixed to the engine 1, The branch intake passage 10 a and the supercharger 13 are fixed to the engine 1 by using the fixing to the engine 1.

  Of these intake system components, the supercharger 13 is heavy, and may be separated from the intercooler 14 side and separately assembled to the engine 1. In this case, by using the divided structure of the intermediate intake passage 10c and the separate structure of the supercharger 13 and the upstream intake passage 10b, the connection of these parts by bolts and nuts etc. is assembled to the engine 1. It will be done after assembly, not before. That is, before assembling to the engine 1, a part of the supercharger 13 and the intermediate intake passage 10c are integrated, and the intercooler 14, the throttle body 12, the upstream intake passage with each branch intake passage 10a are integrated. 10b, the bypass passage 15, and the valve body 16 are integrated, the downstream end of the branch intake passage 10a is fixed to the cylinder head 3, the supercharger 13 is fixed to the cylinder block 2, and then the divided structure is formed. The intermediate intake passage 10c may be connected, and the suction port 13a of the supercharger 13 and the upstream intake passage 10b may be connected.

  The operating region of the supercharger 13 can be set as appropriate. For example, it can be set to be stopped in a low load region and driven in a high load region. In this case, since the bypass passage 15 is short and its volume is small, the transient response of the intake air supply is sufficiently ensured in the natural intake state in which the supercharger 13 is stopped and the intake air is supplied to the engine 1 through the bypass passage 15. . Further, in the supercharging region where the supercharger 13 is driven, the supercharging pressure is controlled to the desired supercharging pressure by adjusting the opening of the control valve 16a. In this supercharging region, since the volume of the bypass passage 15 is small, sufficient transient response is ensured.

  On the other hand, in an engine equipped with a continuously driven supercharger 13 that is not equipped with an electromagnetic clutch in the driven pulley 13A, the control valve 16a is opened to open the bypass passage 15 in a low load region, and the boost pressure is increased. At the time of acceleration from this state (at the time of shifting to a high load range), the control valve 16a is closed and control to increase the supercharging pressure is performed, but the bypass passage 15 is short and the passage volume is short. Therefore, after the control valve 16a is closed, the supercharging pressure immediately increases and a high acceleration response is obtained.

  Here, the engine 1 is mounted on the vehicle in a state where the engine 1 is placed horizontally so that the intercooler 14 faces forward. That is, the engine 1 is mounted in an engine room configured in front of the vehicle compartment so that the crankshaft 6 of the engine 1 extends in the vehicle width direction and the right side in FIG. As a result, the intercooler 14 can effectively exhibit a cooling action using the traveling wind (if there is an electric fan for cooling separately, the opportunity to operate the electric fan can be reduced).

  Although the embodiment has been described above, the present invention is not limited to the embodiment, and can be appropriately changed within the scope described in the scope of claims. For example, the invention includes the following cases. . The engine 1 may be an appropriate engine including a supercharger 13 and an intercooler 14 such as a compression ignition engine. As the supercharger 13, an appropriate type such as a roots type or a screw type can be used. Of course, the object of the present invention is not limited to what is explicitly stated, but also implicitly includes providing what is substantially preferred or expressed as an advantage.

The system diagram which shows simply the intake system in one Embodiment of this invention. The front view which looked at the engine which has the intake system of FIG. 1 from the one end part side of a crankshaft. The right view of FIG. The top view of FIG. The front view corresponding to FIG. 1 which shows the arrangement | positioning relationship between a supercharger, an intercooler, and an intake passage except an engine. The rear view of FIG. FIG. 6 is a top view of FIG. 5. The left view of FIG.

Explanation of symbols

1: Engine 2: Cylinder block 3: Cylinder head 6: Crankshaft 10: Intake passage 10a: Branch intake passage 10b: Upstream intake passage 10c: Intermediate intake passage 11: Air cleaner 12: Throttle body 12a: Throttle valve 13: Supercharging Machine 13A: Driven pulley (drive force input part)
13a: Suction port 13b: Discharge port 14: Intercooler 14a: Upstream tank unit 14b: Downstream tank unit 15: Bypass passage 16: Valve body 16a: Control valves 21, 22: Auxiliary device (upper turbocharger)
23: Another auxiliary device (lower turbocharger)

Claims (9)

A supercharger mechanically driven by the engine and an intercooler disposed downstream of the supercharger are disposed in the intake passage,
The intake passage has a branched intake passage connected to each cylinder of the engine independently in the downstream portion of the intercooler;
In an engine with a supercharger in which a control valve is provided in an intake passage and a bypass passage for bypassing the supercharger is provided,
The intercooler integrally includes an upstream tank portion and a downstream tank portion, and the branched intake passages are branched from the downstream tank portion;
One end of the bypass passage is connected to the downstream tank portion, and the other end of the bypass passage is connected to an upstream intake passage on the upstream side of the supercharger in the intake passage,
The supercharger and the intercooler are arranged on one side of the engine so that the intercooler is positioned above the supercharger;
The intercooler is arranged so as to extend substantially in the vertical direction so that the downstream tank portion is located above and the upstream tank portion is located below and substantially along the one side surface,
The supercharger is disposed at a low position of the engine so that the discharge port of the supercharger is at a position lower than the upstream tank portion;
The upstream intake passage is disposed so as to pass near the downstream tank portion, and the downstream tank portion and the upstream intake passage are connected by the bypass passage in the vicinity of the downstream tank portion. ,
An engine with a supercharger. In claim 1,
The turbocharger is fixed to the engine cylinder block, and the downstream end of each branch intake passage is fixed to the engine cylinder head, so that the intercooler is connected to the turbocharger and each branch. An engine with a supercharger, which is fixed to the engine through an intake passage. In claim 1 or claim 2,
The supercharger is disposed at the front end position on the one end side in the crankshaft direction of the engine, and an auxiliary device driven by the engine is disposed above the supercharger,
The intercooler is disposed behind the auxiliary device;
An engine with a supercharger. In claim 3,
An engine with a supercharger, wherein another auxiliary device driven by the engine is disposed below the supercharger. In claim 1,
The turbocharger has an input portion for receiving a driving force from the engine located on a front end surface on one end side in the crankshaft direction of the engine, and a suction port located on a rear end surface. Placed on the bottom,
The upstream side intake passage extends downward from the vicinity of the rear end of the downstream side tank portion, and then extends forward in a space between the one side surface and the intercooler. Connected to the inlet of the
An engine with a supercharger. In claim 5,
An engine with a supercharger, characterized in that a throttle valve is disposed in the upstream intake passage in the vicinity of the connection portion with the bypass passage and upstream of the connection portion. In any one of Claims 1 thru | or 6,
An air cleaner that filters the intake air introduced into the intake passage is disposed above the engine head.
The upstream intake passage extending from the air cleaner extends downward toward the supercharger after passing through the vicinity of the downstream tank portion.
An engine with a supercharger. In any one of Claims 1 thru | or 7,
In the intake passage, an intermediate intake passage portion connecting the upstream tank portion and the discharge port of the supercharger is inclined so as to gradually become lower toward the discharge port. Engine with a feeder. In any one of Claims 1 thru | or 8,
An engine with a supercharger, wherein the engine is an automobile engine mounted in a horizontally placed state with the one side surface facing forward at a front part of a vehicle body.

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