JP2009085116A - Fuel supply device of rotary piston engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the safety while suppressing temperature rise of a high pressure fuel pump in a direct-injection type rotary piston engine. <P>SOLUTION: The device is equipped with a high pressure fuel pump 2 for supplying fuel to a fuel injection valve 8 for directly injecting fuel into an operation chamber S. The high pressure fuel pump 2 is arranged in proximity to the front end of an eccentric shaft 6 in front of an engine 1 to be driven by a pump drive cam 12 provided to the shaft 6, and is disposed so as to be surrounded by pulleys 11, ... in a position closer to a side wall part on the opposite side to a side wall part of the engine 1 provided with an exhaust manifold 13 and rearward from the pulleys 11, ... of auxiliaries such as an alternator 3 when viewed from the front of a vehicle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fuel supply device for a direct injection type rotary piston engine mounted in an engine room provided on the front side of a vehicle.

  Although it is a reciprocating engine regarding this invention, there exists what was aiming at the simplification of a structure and size reduction by driving a high-pressure fuel pump directly with a camshaft (patent document 1). The high-pressure fuel pump there is provided with a swash plate that swings by the rotation of the intake camshaft, and the bellows expands and contracts in conjunction with the swing of the swash plate, so that fuel is sucked into the pump chamber, boosted and discharged. Is configured to do.

Further, in order to prevent damage to the high-pressure fuel pump disposed in front of the vehicle, a direct injection type diesel engine having a cover plate disposed in front of the high-pressure fuel pump has been proposed (Patent Document 2).
JP-A-8-270520 JP 2007-16716 A

  By the way, various types of direct injection engines that directly inject fuel into a working chamber have been proposed for a rotary piston engine (hereinafter simply referred to as an engine), but, as with the above-described reciprocating engine, A high pressure fuel pump is provided.

  The fuel in the high-pressure fuel pump tends to be hot, and when the internal pressure decreases while the fuel is still hot, a part of it vaporizes and bubbles are generated (this is referred to as percolation), making it impossible to obtain an appropriate boost. is there.

  As in the case of the above-mentioned Patent Document 2, it is preferable to protect the high-pressure pump from being damaged as much as possible even if the vehicle collides.

  This invention is made | formed in view of this point, The place made into the objective is to provide the fuel supply apparatus which can suppress the temperature rise of a high pressure fuel pump, and the capability and safety | security improve.

  In order to achieve the above object, according to the present invention, in an engine mounted in an engine room provided on the front side of a vehicle, a high-pressure fuel pump is disposed in the vicinity of the output shaft on the front side of the engine. The high-pressure fuel pump was directly driven.

  Specifically, it is a fuel supply device for a rotary piston engine mounted in an engine room provided on the front side of a vehicle so that an output shaft extends in the front-rear direction, and fuel is directly injected into the working chamber of the rotary piston engine. And a high-pressure fuel pump for supplying fuel to the fuel injection valve, the high-pressure fuel pump being disposed in the vicinity of the front end portion of the output shaft, and a cam provided on the output shaft It is configured to be driven directly.

  In this configuration, first, in the engine room of the vehicle, the high-pressure fuel pump is located on the front side of the engine. Therefore, when the vehicle is traveling, the high-pressure fuel pump is hit by the traveling wind and efficiently cooled. be able to.

  In addition, since the high-pressure fuel pump is directly driven by a cam provided on the output shaft of the engine, no transmission mechanism such as a pulley or a timing belt is required between the high-pressure pump and the engine, and the structure is extremely simple. Become.

  Moreover, the power of the high pressure fuel pump can be improved because the power is obtained directly from the output shaft rather than the camshaft of the valve system as in the above-mentioned Patent Document 1.

  And since the high-pressure fuel pump is arranged near the front end of the output shaft, even if the vehicle collides from the front and the engine room is crushed and the radiator etc. is pushed back, the radiator Etc. are received by the output shaft, and the impact on the high-pressure fuel pump is mitigated.

  Furthermore, it is preferable that the high-pressure fuel pump is disposed on the side opposite to the left and right side walls of the rotary piston engine provided with an exhaust manifold for exhausting combustion gas.

  Since combustion gas close to 1000 ° C. always flows in the exhaust manifold, the surface temperature also rises to a temperature close to 600 ° C. depending on the part. Therefore, by disposing the high-pressure fuel pump near the side wall portion opposite to the side wall portion where the exhaust manifold that becomes high temperature is provided, the influence of heat radiation from the exhaust manifold can be reduced. Air cooling can be performed efficiently.

  Further, when an auxiliary machine driven by the engine is arranged on the front side of the engine, it is arranged that at least a part of the auxiliary machine is positioned ahead of the high-pressure fuel pump. preferable.

  By doing so, when the vehicle collides from the front, the radiator and the like that come closer are also received by the auxiliary machine in addition to the output shaft, so the safety of the high-pressure fuel pump is improved.

  When a plurality of pulleys driven by the rotary piston engine are arranged on the front side of the rotary piston engine, the plurality of pulleys are positioned in front of the high-pressure fuel pump and are viewed from the front of the vehicle. And can be arranged so as to surround the high-pressure fuel pump.

  By doing so, each pulley becomes like a shield that surrounds the high-pressure fuel pump without interfering with the air-cooling action of the high-pressure fuel pump, so the safety of the high-pressure fuel pump can be further improved. As in 2, it is not necessary to separately provide a cover plate.

  As described above, according to the present invention, since the high-pressure fuel pump is efficiently air-cooled, the temperature rise can be suppressed, and the occurrence of percolation can also be suppressed. Since the high pressure fuel pump is directly driven by the output shaft of the engine, the capacity is improved. And even if a vehicle collides from the front, a high-pressure fuel pump can be protected by an output shaft or an auxiliary machine.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  1 to 3 show a rotary piston engine 1 (hereinafter simply referred to as the engine 1) to which the fuel supply device of the present invention is applied. FIG. 1 is a front view showing the front side of the engine 1, and FIG. 2 is a side view with the front side of the engine 1 facing left. 3 is a cross-sectional view taken along line AA in FIG.

  As shown in FIGS. 1 and 2, the engine 1 includes a high-pressure fuel pump 2 constituting the fuel supply device of the present invention, an alternator 3, an air conditioner compressor 4, a water pump 5 and the like around it. A belt transmission mechanism for driving these auxiliary machines 3, 4 and 5 is provided on the front side of the machine.

  And this engine 1 is mounted in the engine room provided in the front side of the vehicle in the state which turned the front side provided with these auxiliary machines 3, 4, 5 etc. to the front. Hereinafter, the front and rear directions and the like follow the state in which the engine 1 is mounted on the vehicle.

  As shown in FIG. 2, the engine 1 includes an engine body in which two rotary housings 1 a, 1 a and three side housings 1 b, 1 b, 1 b are integrated so as to be alternately arranged in the front-rear direction of the vehicle, A front cover 1d is provided so as to cover the front surface of the front side housing 1b of the engine body.

  As shown in FIG. 3, two substantially elliptical rotor accommodating chambers 1 c drawn with a trochoidal curve are formed in the engine body, and each rotor accommodating chamber 1 c is substantially omitted. One rotor R having a triangular shape is accommodated one by one.

  Each rotor R is supported by a phase gear (not shown) provided on the inner side thereof so as to make a planetary rotational movement with respect to an eccentric shaft 6 (hereinafter simply referred to as a shaft 6) that is an output shaft of the engine 1. The top of the rotor R is in sliding contact with the inner peripheral surface of the trochoid of the rotor housing 1a, and three working chambers S, S, S are defined in the rotor accommodating chamber 1c.

  Thus, during one rotation of the rotor R, the three working chambers S, S, S move in the circumferential direction, and the respective strokes of the intake, compression, expansion (combustion), and exhaust combustion cycles are performed. For example, as shown in FIG. 3, if the rotor R rotates in the direction of the arrow, fuel is directly injected into the intake air flowing from the intake port 7 in the upper left working chamber S by the injector 8 (fuel injection valve). After the air-fuel mixture is formed, the air-fuel mixture is moved to the right side, and the air-fuel mixture is compressed and ignited by the spark plug 9 and moved to the lower left side while burning, and the combustion gas is exhausted from the exhaust port 10 and is again moved to the upper left side. Moving.

  In this way, the engine 1 is configured to output the rotational force of the rotor R generated in the combustion cycle of the three working chambers S, S, S moving through the shaft 6.

  In the engine 1, the high-pressure fuel pump 2 is disposed in the vicinity of the front end portion of the shaft 6 protruding forward of the engine 1 relative to the front side housing 1 b, and the high-pressure fuel pump 2 is directly driven by the shaft 6. It has been devised.

  Specifically, as shown in FIG. 2, in a state where the engine 1 is mounted on the vehicle, the front end of the shaft 6 extending in the front-rear direction passes through the front cover 1 d constituting the front wall portion of the engine 1. As shown in FIG. 4, the driving pulley 11 of the belt transmission mechanism is fixed to the protruding end, and the pump driving cam 12 is located near the inner side of the front cover 1d. It is fixed integrally. In FIG. 4, the front cover 1d is shown in cross section to show the inside.

  The pump drive cam 12 is an annular eccentric cam that is fixed to the outer periphery of the shaft 6 in a state in which its axis is disengaged from the axis of the shaft 6 (see FIG. 5). A mechanical high-pressure fuel pump 2 is disposed adjacent to the pump driving cam 12.

  As shown in FIG. 4, the high-pressure fuel pump 2 includes a pump main body 30 and a pump assembly portion 31 formed on a front cover 1 d to which the high-pressure fuel pump 2 is assembled, and a pump formed inside the pump main body 30. By changing the volume of the chamber (not shown) to be larger or smaller, the fuel fed from the fuel tank (not shown) is pressurized and supplied to the injector 8. In order to change the volume of the pump chamber, the high-pressure fuel pump 2 is provided with a roller lift mechanism.

  The roller lift mechanism is provided in a roller assembly 36 whose rotation axis is parallel to the axial direction of the shaft 6, a roller lifter 37 that rotatably supports the roller 36 toward the pump drive cam 12, and the pump assembly portion 31. The support portion 31a supports the roller lifter 37 so as to be slidable at right angles to the axial direction of the shaft 6, and includes a spring member 38 that pushes and biases the roller lifter 37 toward the pump drive cam 12.

  As shown in FIG. 5, the roller 36 is disposed so that its outer peripheral surface is always pressed against the outer peripheral surface of the pump driving cam 12 by a spring member 38, and when the shaft 6 rotates, the pump driving cam 12. The roller lifter 37 together with the roller 36 is slidably displaced relative to the pump assembly portion 31 by the amount of eccentricity h, and the volume of the pump chamber changes with it. For example, as shown in (a) of the figure, when the roller lifter 37 is slid to the innermost side in the radial direction of the shaft 6, the volume of the pump chamber becomes maximum, and as shown in (b) of the figure, the roller lifter 37 is the most. The volume of the pump chamber is minimized when sliding displacement is performed radially outward.

  That is, the rotational motion of the shaft 6 is converted into the displacement motion of the roller lifter 37 by the pump driving cam 12 and the roller lift mechanism, and the volume of the pump chamber changes.

  According to the roller lift mechanism having such a configuration, first, since the roller 36 is in contact with the outer peripheral surface of the pump driving cam 12 rotating at high speed, the frictional resistance is extremely small and the durability is excellent. Since the roller 36 is displaced along the outer peripheral surface of the cylindrical pump drive cam 12, the operation is smooth even at high speed, and the high-pressure fuel pump 2 is efficiently driven by the high-speed rotating shaft 6. Can be made.

  By disposing the high pressure fuel pump 2 in the vicinity of the shaft 6, the high pressure fuel pump 2 can be protected.

  That is, the shaft 6 is firmly supported by the engine 1 except for the rotational movement around the axis, and in particular, the axial direction is supported by the two rotor housings 1a and the three side housings 1b. Even if a large external force is applied, it will not move.

  The protruding end of the shaft 6 and at least a part of the drive pulley 11 fixed thereto are located in front of the high-pressure fuel pump 2.

  Accordingly, even if the vehicle collides from the front and the engine room is crushed and the radiator or the like is pushed backward, the shaft 6 receives the radiator or the like directly or indirectly. The impact received can be effectively reduced.

  The high-pressure fuel pump 2 is disposed so as not to overlap the drive pulley 11 when viewed from the front of the vehicle. Therefore, there is nothing to block this in front of the high-pressure fuel pump 2, so that the traveling wind taken into the engine room from the front of the vehicle when it travels directly hits the high-pressure fuel pump 2 and can be efficiently cooled.

  Further, the engine 1 is devised so that the air cooling of the high-pressure fuel pump 2 by the traveling wind is effectively performed.

  That is, as shown in FIG. 1, an exhaust manifold 13 is provided below the left side wall portion of the engine 1, and each of the working chambers S, S,. The burned gas combusted in (1) is collected in the exhaust manifold 13 through the exhaust port 10 and exhausted outside the vehicle through an exhaust pipe, a catalytic converter, a silencer, etc. (not shown).

  Therefore, when the engine 1 is in operation, burned gas that is close to 1000 ° C. always flows in the exhaust manifold 13, and the surface of the exhaust manifold 13 is at a high temperature close to 600 ° C. depending on the part. It will be heated.

  Therefore, on the front side of the engine 1, the high pressure fuel pump 2 is disposed near the right side wall portion where the exhaust manifold 13 is not disposed, so that the heat radiation of the exhaust manifold 13 does not easily affect the high pressure fuel pump 2. .

  An intake system 14 including an intake manifold that communicates with the intake port 7 is disposed on the upper side of the exhaust manifold 13, and intake air is supplied to each rotor accommodating chamber 1 c through these.

  The engine 1 is further devised in the arrangement of auxiliary machines such as the alternator 3, the air conditioner compressor 4, and the water pump 5 (see FIGS. 1 and 2).

  The alternator 3 is a known alternating current generator that converts alternating current electromotive force generated by rotation of a built-in rotor into direct current and supplies electricity to a battery and various electrical components (not shown). A first pulley 3a is attached to the tip of the rotating shaft. And this alternator 3 is assembled | attached to the upper right part of the front side of the engine 1 in the state which turned the 1st pulley 3a to the front, and made the rotating shaft parallel to the shaft 6. FIG.

  The air conditioner compressor 4 is a known compressor for compressing the refrigerant, and the water pump 5 is a known pump for circulating the coolant flowing in the cooling system of the engine 1. Each of these also has a rotating shaft with a second pulley 4a and a third pulley 5a attached to the tip, respectively, and like the alternator 3, the second pulley 4a and the third pulley 5a are directed forward and the rotating shaft is a shaft. 6, it is assembled to the right middle part and the upper left part on the front side of the engine 1.

  The first to third pulleys 3a, 4a, 5a of these auxiliary machines are all arranged flush with the drive pulley 11 of the shaft 6 in the front-rear direction, and each pulley 3a, 4a, When the engine 1 is actuated and the drive pulley 11 is rotated, a single endless belt 15 is wound around 5a and 11 to transmit the rotational power and drive the auxiliary machines 3, 4 and 5 in series. Yes.

  A tension pulley 16 that adjusts the tension of the endless belt 15 is disposed between the alternator 3 and the water pump 5, and the water pump 5 and the air conditioner compressor 4 are arranged side by side. Two idle pulleys 17 and 17 are provided. These pulleys 16, 17 and 17 are also supported by a rotating shaft attached to the engine 1 in parallel with the shaft 6, and are flush with the driving pulley 11 and the pulleys 3a, 4a and 5a of the auxiliary machine. The endless belt 15 is wound around.

  That is, the first to third pulleys 3a, 4a, 5a, the tension pulley 16, the idle pulleys 17, 17, and the endless belt 15 constitute one belt transmission mechanism.

  As shown in FIG. 1, the high-pressure fuel pump 2 has a plurality of pulleys 3a, 4a,..., Specifically, a drive pulley 11 of the shaft 6 and an air conditioner compressor 4 as viewed from the front. The pulley 4a and the two idle pulleys 17 and 17 are disposed so as to face the front from the position surrounded by them, and each pulley 11 is arranged around the front of the high-pressure fuel pump 2. , 4a, 17, 17 are surrounded by disk-shaped end walls.

  When viewed from the side, as shown in FIG. 2, the high-pressure fuel pump 2 is located behind the plurality of pulleys 3a, 4a,.

  With this arrangement, first, the front of the high-pressure fuel pump 2 is open without being obstructed, so that the traveling wind can efficiently hit the high-pressure fuel pump 2 when the vehicle is running and can be cooled well. Can be suppressed.

  Further, even if the vehicle collides from the front and the engine room is crushed and the radiator or the like is pushed toward the engine 1, the plurality of pulleys 3a and 4a are brought before hitting the high-pressure fuel pump 2. It is easy to hit the end wall. Since these pulleys 3a, 4a,... Are firmly supported by the engine 1 by the shaft 6 or the rotating shaft, they do not move backward even when a considerable external force is applied. In addition, since the external force is distributed and received by the plurality of pulleys 3a, 4a,..., It is more effective.

  Thus, since the front near the high pressure fuel pump 2 is covered like a shield by the pulleys 3a, 4a,..., The high pressure fuel pump 2 can be securely protected.

  As described above, according to the present invention, no special member is required, and the safety of the high-pressure fuel pump 2 can be improved while the ability of the high-pressure fuel pump 2 is efficiently exhibited.

  The fuel supply device according to the present invention is not limited to the above-described embodiment, and includes various other configurations. For example, the arrangement of the auxiliary machines 3, 4, 5 and the pulleys 3 a, 4 a,... Can be practically adjusted within a range where the above-described effects can be obtained. The types and quantities of auxiliary machines and pulleys are not limited to this.

1 is a front view of a rotary piston engine according to the present invention. 1 is a side view of a rotary piston engine according to the present invention. It is arrow AA sectional view taken on the line in FIG. It is the figure seen from the direction shown by the arrow B in FIG. A part of the main part is shown inside. It is a figure for demonstrating operation | movement of a high pressure fuel pump.

Explanation of symbols

1 Rotary piston engine 2 High-pressure fuel pump 3 Alternator
3a First pulley 4 Air conditioner compressor (auxiliary machine)
4a Second pulley 5 Water pump (auxiliary machine)
5a 3rd pulley 6 eccentric shaft (output shaft)
8 Injector (fuel injection valve)
11 Drive pulley 12 Pump drive cam (cam)
13 Exhaust manifold 16 Tension pulley 17 Idle pulley R Rotor S Working chamber

Claims (4)

A fuel supply device for a rotary piston engine mounted on an engine room provided on the front side of a vehicle so that an output shaft extends in the front-rear direction,
A fuel injection valve for directly injecting fuel into the working chamber of the rotary piston engine;
A high-pressure fuel pump for supplying fuel to the fuel injection valve,
A fuel supply device for a rotary piston engine, wherein the high-pressure fuel pump is disposed in the vicinity of a front end portion of the output shaft and is directly driven by a cam provided on the output shaft. A fuel supply device for a rotary piston engine according to claim 1,
An exhaust manifold for exhausting combustion gas is provided on either the left or right side wall of the rotary piston engine,
A fuel supply device for a rotary piston engine, characterized in that a high-pressure fuel pump is disposed near the other side wall on the front side of the rotary piston engine. A fuel supply device for a rotary piston engine according to claim 1 or 2,
An auxiliary machine driven by the rotary piston engine is arranged on the front side of the rotary piston engine,
The fuel supply device for a rotary piston engine, wherein at least a part of the auxiliary machine is located in front of the high-pressure fuel pump. A fuel supply device for a rotary piston engine according to any one of claims 1 to 3,
A plurality of pulleys driven by the rotary piston engine are disposed on the front side of the rotary piston engine,
A fuel supply device for a rotary piston engine, wherein the plurality of pulleys are positioned in front of the high-pressure fuel pump and are disposed so as to surround the high-pressure fuel pump as viewed from the front of the vehicle.

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