JP2005036681A - Motorcycle installing fuel supply unit of v-shape engine and v-shape engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motorcycle installing a fuel supply unit suitable for a V-shape two-cylinder engine and the engine. <P>SOLUTION: The motorcycle includes the fuel supply unit having first, second cylinder units 10, 11 disposed so as to form a V bank, and first, second fuel injection valves 37, 37' for injecting to supply fuel in the first, second cylinder units 10, 11 of the V-shape engine having a crankshaft 18 arranged to a bottom lower part of the V bank. A common rail 41c to the first, second cylinder units is disposed so as to cross the V bank in a substantially crankshaft right-angled direction. One end and the other end of the common rail are respectively connected to the first, second fuel injection valves, and a fuel pump 35 is connected to a mid-way part of the common rail via a fuel passage 41b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a fuel supply device for a V-type engine suitable for a motorcycle and a motorcycle equipped with the V-type engine, and more specifically, a diesel engine or a direct-injection gasoline engine in which fuel is directly injected into a cylinder. The present invention relates to the improvement of the fuel supply apparatus.
[0002]
[Prior art]
A so-called common rail system is known as a fuel supply device that directly injects and supplies fuel into a cylinder of a V-type engine. This is a fuel supply rail (common rail) common to each cylinder arranged in the V bank in parallel with the crankshaft, and the common rail is connected to the fuel injection valve of each cylinder. A high pressure fuel is supplied into the common rail by a fuel pump, and the fuel injection valve is opened at a predetermined timing to inject and supply the fuel directly into each cylinder (for example, see Patent Document 1).
[0003]
[Patent Literature]
Japanese Patent Laid-Open No. 2001-155931
[0004]
[Problems to be solved by the invention]
By the way, the fuel supply apparatus described in the above document is a fuel supply apparatus suitable for a multi-cylinder V-type engine for automobiles in which a common rail is arranged in parallel to the crankshaft and a large number of cylinders are arranged to form a V bank. . Therefore, it is not practical to adopt the conventional fuel supply device as it is in a V-type two-cylinder engine having only two cylinders as a motorcycle engine.
[0005]
The present invention has been made in view of the above-described conventional situation, and an object thereof is to provide a fuel supply device suitable for a V-type two-cylinder engine and a motorcycle equipped with the engine.
[0006]
[Means for Solving the Problems]
The first and second cylinder units of the V-type engine in which the first and second cylinder units are arranged so as to form a V bank and a crankshaft is arranged below the bottom of the V bank. In the fuel supply device in which fuel is injected and supplied via the first and second fuel injection valves, the common rail common to the first and second cylinder units is provided, and the V bank is substantially perpendicular to the crankshaft. The common rail is arranged so that one end and the other end of the common rail are connected to the first and second fuel injection valves, and a fuel pump is connected to a middle portion of the common rail via a fuel passage.
[0007]
According to a second aspect of the present invention, in the first aspect, an air chamber common to the first and second cylinder units is disposed below the common rail so as to cover at least a part of the V bank space, The bottom surface of the chamber is connected to the intake port that opens to the V bank side of the first and second cylinder units.
[0008]
According to a third aspect of the present invention, in the first aspect, an air chamber common to the first and second cylinder units is disposed on the upper side of the common rail so as to cover at least a part of the V bank space, and the air chamber One side and the other side of the bottom surface of the first and second cylinder units are connected to an intake port that opens to the V bank side of the first and second cylinder units.
[0009]
A fourth aspect of the present invention is characterized in that, in the second or third aspect, the fuel injection valve is disposed substantially parallel to a cylinder axis and on the outer side in the axial direction of the common rail from the air chamber.
[0010]
According to a fifth aspect of the present invention, in the first aspect, the first and second fuel injection valves are inserted into the cylinder head so as to substantially coincide with the cylinder axis, and are injected from the first and second fuel injection valves. A glow plug for heating the fuel is disposed, and the glow plug is inclined so that the heating portion at the tip is located substantially at the center of the combustion chamber and the power feeding end is separated from the cylinder shaft outward in the crankshaft direction. It is characterized by that.
[0011]
According to a sixth aspect of the present invention, in the fifth aspect, the first and second cylinder units are formed by stacking and connecting a cylinder head, a rocker support, and a head cover on a cylinder block, and the cylinder head covers a ceiling portion of the combustion chamber. And a rocker support part that supports the rocker support separated into an exhaust side part and an intake side part, and the rocker support includes a rocker side mounting boss part and the exhaust side part. The glow plug is formed so as to be positioned between the intake side portion, and the glow plug is screwed and fixed to the rocker side mounting boss portion.
[0012]
The invention according to claim 7 is the invention according to claim 5, wherein the first and second cylinder units are formed by stacking and connecting a cylinder head, a rocker support, and a head cover on a cylinder block, and the cylinder head covers a ceiling portion of the combustion chamber. And a rocker support part that is separated into an exhaust side part and an intake side part to support the rocker support, and the ceiling wall side mounting boss part is provided on the exhaust side. The glow plug is formed so as to be positioned between the portion and the intake side portion, and the glow plug is screwed and fixed to the top wall side mounting boss portion.
[0013]
The invention according to claim 8 is a motorcycle equipped with the engine including the fuel supply device according to any one of claims 1 to 7, wherein the engine moves the first and second cylinder units in the longitudinal direction of the vehicle. And the crankshaft is mounted on the vehicle body frame with the crankshaft directed in the vehicle width direction, the vehicle body frame is disposed at an interval in the vehicle width direction, the engine is suspended and supported, and a fuel tank is mounted. The first and second fuel injection valves are disposed between the left and right main frames so as to face upward in plan view. It has a feature.
[0014]
According to a ninth aspect of the present invention, in the eighth aspect, the first and second cylinder units are disposed so as to be displaced in a crankshaft direction, and the first and second fuel injection valves are provided in the combustion chamber in the cylinder head. The first and second pressing members are inserted into a valve hole formed so as to penetrate the cylinder head and are fixed to the cylinder head by first and second pressing members disposed on the head cover. The second cylinder unit is arranged inside the displacement direction.
[0015]
[Effects of the invention]
According to the first aspect of the present invention, the common rail is disposed so as to cross the V bank in a direction substantially perpendicular to the crankshaft, and one end and the other end of the common rail are connected to the first and second fuel injection valves, Since the fuel pump is connected to the part via the fuel passage, the common rail can be arranged by effectively using the V bank space with a short crankshaft length in the V-type two-cylinder engine having only two front and rear cylinder units. Compared to the conventional structure in which the common rail is arranged in the direction of the crankshaft, the structure of the fuel supply device can be made simple and suitable for the V-type two-cylinder engine, and the V bank space can be configured compactly. .
[0016]
According to the invention of claim 2, an air chamber common to the first and second cylinder units is disposed below the common rail so as to cover at least a part of the V bank space, Since the intake port that opens to the V bank side of the first and second cylinder units is connected, the structure of the intake device can be a simple structure suitable for a V-type two-cylinder engine. The bank space can be configured compactly.
[0017]
According to a third aspect of the present invention, an air chamber common to the first and second cylinder units is disposed on the upper side of the common rail so as to cover at least a part of the V bank space. Since one side and the other side of the common rail are connected to the intake port that opens to the V bank side of the first and second cylinder units, the structure of the intake device is simple and suitable for a V-type two-cylinder engine. From this point, the structure around the V bank space can be made compact.
[0018]
According to the invention of claim 4, since the fuel injection valve is disposed substantially parallel to the cylinder axis and outside the air rail in the axial direction of the common rail, the air chamber and the common rail are disposed using the V bank space. In this case, the air chamber does not hinder the arrangement of the fuel injection valve.
[0019]
According to the invention of claim 5, since the glow plug is disposed so that the heating portion at the front end is positioned substantially at the center of the combustion chamber and the power supply end portion is inclined away from the cylinder shaft outward in the crankshaft direction. When the air chamber or common rail is arranged using the bank space, the air chamber does not hinder the arrangement of the glow plug.
[0020]
According to the sixth aspect of the present invention, since the rocker support portion of the cylinder head is separated into the exhaust side and the intake side, this portion can be used as an outside air passage, and the ceiling wall that surrounds the combustion chamber of the cylinder head, in particular. The cooling property of the part can be secured. And, when placing the glow plug, the rocker side mounting boss part is formed on the rocker support so as to be positioned between the exhaust side and intake side rocker support parts, and the glow plug is screwed and fixed thereto. Only a small-diameter glow plug is located in the part that becomes the passage for the outside air, and the arrangement of the glow plug becomes an obstacle when the outside air flows between the exhaust side and intake side rocker support parts of the cylinder head. It is possible to suppress the cooling around the combustion chamber of the cylinder head.
[0021]
According to the invention of claim 7, the cylinder head has a structure having a top wall portion constituting a ceiling portion of the combustion chamber, a rocker support portion separated into an exhaust side portion and an intake side portion, and the top wall portion Since the top wall side mounting boss part is provided on the exhaust side of the rocker support part, a passage through which the outside air flows is still secured between the exhaust side part and the intake side part, and the glow plug is connected to the exhaust side of the cylinder head. , It is possible to suppress obstruction of the flow of the outside air flowing between the intake side rocker support portions, and to ensure the cooling performance around the combustion chamber of the cylinder head.
[0022]
According to the invention of claim 8, the first and second fuel injection valves are disposed between the left and right main frames in plan view so as to face upward, so that the cylinder can be removed by removing the fuel tank. The fuel injection valve can be attached to and detached from the unit. Therefore, after the fuel supply device such as the fuel injection valve is mounted on the engine unit, it is not always necessary to mount the engine unit on the vehicle body frame. it can.
[0023]
According to the ninth aspect of the present invention, the first and second cylinder units are disposed so as to be displaced in the crankshaft direction, and the first and second fuel injection valves are pressed and fixed to the cylinder head. Since the two pressing members are disposed inside the displacement direction of the first and second cylinder units, the pressing member can be disposed using the space generated by the displacement, and the attaching and detaching work of the pressing members is performed on the left and right sides. Problems such as obstruction due to interference with the main frame can be suppressed.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 to 5 are views for explaining a first embodiment of the present invention. FIG. 1 is a right side view of a motorcycle, FIG. 2 is a plan view of a state where an engine is mounted on a body frame, and FIG. 4 is a right side view of the engine, FIG. 4 is a developed sectional view of the engine, and FIG. 5 is a plan view of the cylinder head. In the present embodiment, front / rear / left / right means front / rear / left / right in a state of being normally seated on a seat.
[0025]
In the drawing, reference numeral 1 denotes a motorcycle to which the present embodiment is applied. The motorcycle 1 controls a front fork 4 that pivotally supports a front wheel 3 at the lower end by a head pipe 2a at the front end of a vehicle body frame 2. The rear arm 6 that supports the rear wheel 5 at the rear end is pivotally supported by the rear arm bracket 2b so that the rear arm 6 can swing up and down, and the engine unit 7 is mounted at the center of the body frame 2. The fuel tank 8 is mounted on the upper side of the engine unit 7, and the seat 9 is mounted behind the fuel tank 8.
[0026]
The vehicle body frame 2 extends rearward from the head pipe 2a and extends obliquely rearward and downward, is disposed at a predetermined interval in the vehicle width direction, and is coupled to the upper end of the rear arm bracket 2b. 2c, 2c, and a pair of left and right down frames 2d extending downward from the head pipe 2a on the front side of the engine unit 7, passing rearwardly through the lower side of the engine unit 7, and coupled to the lower end of the rear arm bracket 2b. , 2d.
[0027]
The engine unit 7 is composed of an engine body 7 'composed of an air-cooled four-cycle V-type two-cylinder diesel engine, and a crankcase 12 in which a transmission case portion 12a for housing a transmission is integrated.
[0028]
The engine body 7 'is formed so that the front cylinder unit 10 and the rear cylinder unit 11 form a V bank having a bank angle of about 45 to 50 degrees, and the thickness of the large end 17a of the connecting rod 17 in the crankshaft direction. Only the front and rear cylinder units 10 and 11 are displaced on the right and left sides and arranged on the crankcase 12. Needless to say, the displacement directions of the cylinder units 10 and 11 may be reversed to the left and right.
[0029]
Since the front cylinder unit 10 and the rear cylinder unit 11 have basically the same structure, the front cylinder unit 10 will be mainly described below. The front cylinder unit 10 includes a cylinder block 13 coupled to the crankcase 12 by a plurality of fixing bolts 28a, and a cylinder head 14 coupled to the upper mating surface 13b of the cylinder block 13 by a plurality of head bolts 28b. And a rocker support 15a mounted on the upper mating surface 14e of the cylinder head 14 and a head cover 15 mounted on the upper mating surface 15b of the rocker support 15a. The rocker support 15a is composed of a plurality of parts.
[0030]
The cylinder head 14 includes a ceiling wall portion 14h that constitutes a ceiling portion of the combustion chamber a, which will be described later, and an exhaust side rocker support portion 14i and an intake side rocker support portion 14j that are separated on the exhaust side and the intake side. The rocker support 15a is disposed so as to cover the cylinder head 14 and span the exhaust side and intake side rocker support portions 14i and 14j. The rocker support 15a, the exhaust and intake rocker support portions 14i and 14j, and the top wall portion 14h communicate with each other in the crankshaft direction to form a passage b that allows the flow of outside air. The outside air flows through the passage b, so that the cooling performance of the cylinder head 14, particularly the top wall portion 14h, is enhanced.
[0031]
In the rocker support 15a, the exhaust side and intake side rocker shafts 22 are arranged in parallel with the crankshaft 18 and are pivotally supported. Further, the upper end portion of one large-diameter cylindrical push rod cover 23 'for accommodating the exhaust side and intake side push rods 23, 23 for swinging the rocker shaft 22 is fitted to the right end portion of the rocker support 15a. A pipe support boss portion 25c to be fixed is formed. The push rod cover 23 'extends toward the crankcase 12 through a recess 14m formed by cutting out the cooling fin 14k of the cylinder head 14.
[0032]
A piston 16 is slidably inserted into a cylinder bore 13 a formed in the cylinder block 13, and the piston 16 is connected to a crank pin 18 a of a crankshaft 18 by a connecting rod 17. The front and rear connecting rods 17, 17 are connected to the same crank pin 18a.
[0033]
At the rear of the crankshaft 18, there is disposed a speed change mechanism 51 in which a main shaft 51a and a gear group mounted on the drive shaft 51b are arranged in parallel with each other. The rotation of the crankshaft 18 is transmitted from the reduction small gear 51c key-connected to the left end of the crankshaft 18 to the transmission mechanism 51 through the reduction large gear 51d attached to the left end of the main shaft 51a and the clutch mechanism 49, The power is transmitted from the output pulley 51e attached to the right end of the drive shaft 51b to the rear wheel via the drive belt.
[0034]
A combustion chamber a is constituted by a portion of the cylinder block side mating surface 14a of the cylinder head 14 facing the cylinder bore 13a and a piston recess 16a provided in the upper surface of the piston 16. Two exhaust valve openings and two intake valve openings are formed in the combustion chamber constituting portion of the cylinder head 14, and the exhaust valve 19 and the intake valve 20 are arranged in two each. Open and close. The two exhaust valve openings are joined by a bifurcated exhaust port 14b and led to one exhaust side external connection opening formed on the V bank outer wall, and the two intake valve openings are bifurcated intake ports. 14c is led to one intake-side external connection opening 14d formed on the inner wall of the V bank while merging with each other.
[0035]
The exhaust valve 19 and the intake valve 20 are arranged substantially parallel to the cylinder axis, and the exhaust valve 19 and the intake valve 20 are opened and closed by an OHV type valve mechanism 21. The valve mechanism 21 supports the rocker shaft 22 in parallel with the crankshaft by the rocker support 14a so as to be swingable, and the tip of one rocker arm 22a of the rocker shaft 22 is connected to the exhaust and intake valves 19, 20 above. The other end of the rocker arm 22b is brought into contact with the upper end of the push rod 23, the lower end of the push rod 23 is placed on the lifter 24, and the lifter 24 is placed on the cam nose of the cam shaft 25. It has the general structure arranged in.
[0036]
The lower end of the push rod cover 23 ′ in which the push rod 23 is accommodated is fitted and fixed to a pipe support boss formed on the camshaft upper side of the crankcase 12. The camshaft 25 is rotationally driven by the crankshaft 18 via an intermediate gear, and the camshaft 25 incorporates a decompression device 26 that releases the compression pressure at the time of starting to facilitate the starting.
[0037]
An exhaust device 27 is connected to the external connection opening of the exhaust port 14 b of the cylinder head 14. The exhaust device 27 has a structure in which exhaust pipes 27a and 27b connected to the front and rear cylinder heads 14 and 14 are joined together, and a large-diameter cylindrical silencer 27c is connected to the joining portion. , Extending rearward along the right side of the vehicle.
[0038]
The intake port 14c of the cylinder head 14 extends substantially linearly toward the V bank as viewed in the crankshaft direction (state shown in FIG. 3), and its external connection opening 14d opens obliquely upward inside the V bank. is doing. An intake device 29 is connected to the external connection opening 14d. This intake device 29 is connected to a throttle body 31 made of light alloy casting via a joint member 30 made of rubber or the like to the external connection opening 14d, and is made of a resin molded product upstream and downstream of the throttle body 31. A common air chamber 32 is connected to the cylinder, and an air cleaner 34 is connected to the upstream side of the air chamber 32 via an air duct 33 made of rubber or the like.
[0039]
The air chamber 32 functions as a calming tank that suppresses intake pulsation by providing a larger volume in the air passage between the air cleaner 34 and the throttle body 30 than the other portions. The air chamber 32 has a substantially rectangular box shape that substantially covers the V bank in plan view, and has a thickness (height) set to be relatively thin, and is a vertically divided type. A mounting boss portion 32a for connecting the throttle body 31 is formed on the bottom surface of the air chamber 32 so as to bulge downward. The mounting boss portion 32a has a substantially triangular shape when viewed in cross section, and the oblique side portion of the triangle on the side of the external connection opening 14d serves as a connection surface of the throttle body 31.
[0040]
In the assembling operation of the intake device 29, first, the front and rear throttle bodies 31 and the joint member 30 are connected to the mounting boss portion 32a of the air chamber 32 to form an intake unit. The unit covers the V bank from above and is disposed so that the throttle body 31 and the like are positioned in the V bank, and the joint member 30 is bolted and fixed to the external connection opening 14d. In this way, the intake unit can be attached to the engine side with a simple operation.
[0041]
The fuel supply device 35 of the present embodiment includes a high-pressure fuel supply pump 36 disposed outside the bottom of the V bank and fuel injection valves 37 and 37 inserted and disposed in the cylinder units 10 and 11. 41 has a schematic configuration connected at 41.
[0042]
The fuel injection valve 37 is inserted into a valve hole 14 f formed so as to be coaxial with the cylinder shaft from the head cover 15 of the front cylinder unit 10 to the vicinity of the cylinder block side mating surface 14 a of the cylinder head 14. The tip of an injection nozzle 37b formed so as to protrude from the tip end surface 37a of 37 faces the combustion chamber a.
[0043]
Further, the front end surface 37a of the injection valve 37 is in contact with the bottom surface of the valve hole 14f, and a pressure step portion 37c formed on the upper end portion of the fuel injection valve 37 is pressed by a pressing member 38 to thereby inject the fuel. The valve 37 is pressed against the cylinder head 14 and fixed.
[0044]
The pressing member 38 is a rod-shaped member having a bifurcated pressing piece 38a at one end and a stopper portion 38b at the other end. In the fuel injection valve 37, the stopper portion 38b is brought into contact with the support portion 15e protruding from the head cover 15, and the pressing pieces 38a are brought into contact with the pressing step portions 37c on both sides of the fuel injection valve 37, respectively. The inserted bolt 39 is screwed into the boss portion 15f of the head cover 15 to be pressed and fixed to the valve hole 14f of the cylinder head 14.
A glow plug 40 for heating the fuel injected from the fuel injection valve 37 when the engine is started is mounted on the cylinder head 14 so as to be located on the opposite side of the push rod cover 23 '. In the glow plug 40, the heating portion 40a at the tip thereof is positioned in the immediate vicinity of the injection nozzle 37b in the combustion chamber a, and the power feeding portion 40b at the upper end thereof extends from the cylinder axis toward the crankshaft and push rod cover 23 '. It is arranged at an angle so as to be away from the opposite side.
[0045]
The glow plug 40 is screwed and fixed to a rocker side mounting boss 15d formed on the rocker support 15a. The rocker side mounting boss 15d is formed so as to connect the exhaust side portion and the intake side portion of the rocker support 15a. Therefore, as shown in FIG. 5, when viewed in the cylinder axial direction, the rocker side mounting boss portion 15d is located between the front rocker support portion 14i and the rear rocker support portion 14j of the cylinder head 14, One of the head bolts 28b is located below the glow plug 40.
[0046]
In FIG. 5, the cylinder head 14 is depicted in a plan view, and only the rocker side mounting boss portion 15 d formed on the rocker support 15 a overlaps the upper side of the cylinder head 14. ing.
[0047]
Here, since the glow plug 40 is obliquely screwed and fixed to the rocker side mounting boss portion 15d formed above the passage b, as shown in FIG. 4, the small-diameter bar-like main body portion 40c of the glow plug 40 is provided. Crosses the passage b obliquely, and the tip of the main body 40c is inserted into the top wall 14h of the cylinder head 14.
[0048]
The fuel pump 36 is supported by a right case cover (one side case cover) 42 attached to the right side surface of the crankcase 12. The right case cover 42 covers the right end of the crankshaft 18 and houses a gear mechanism for driving the camshaft 25 by the crankshaft 18. The right case cover 42 is fixed to the right end surface of the crankcase 12. The case main body 42a and a cover portion 42b that detachably covers the case main body 42a.
[0049]
A pump support portion 42c is integrally formed in the case body 42a so as to extend upward from a portion accommodating the gear mechanism to a bottom portion of the V bank, and a support hole formed in an upper end portion of the pump support portion 42c. The drive boss portion 36a of the fuel pump 36 is fitted and inserted into 42d, and is bolted to the periphery of the support hole 42d.
[0050]
The suction port 36c of the fuel pump 36 is connected to the fuel tank 8 via a suction pipe 41a, the discharge port 36d is connected to a common rail 41c via a discharge pipe 41b, and the front end of the common rail 41c is the front pipe 41d. The rear end of the front fuel injection valve 37 is connected to the rear fuel injection valve 37 'by a rear pipe 41e. In addition, 41f is a union joint, and each said pipe can be attached or detached easily by rotating this union joint 41f.
[0051]
Here, the common rail 41c has a cylindrical shape having a volume sufficient to mitigate fluctuations in fuel pressure due to fuel injection, and crosses the V bank in the direction perpendicular to the crankshaft, that is, crosses the V bank in the vehicle longitudinal direction. In addition, the air chamber 32 is disposed so as to contact the upper surface of the air chamber 32. The discharge pipe 41b is connected to the rear portion of the common rail 41c so as to intersect at substantially right angles thereto. The upper end height position of the fuel injection valves 37, 37 'and the height position of the common rail 41 are configured to substantially coincide with each other.
[0052]
The fuel pump 36 is covered with a pump cover 44, and the pump cover 44 is fixed to the pump support portion 42c with bolts. The pump cover 44 may be supported by the cylinder block 13 or the cylinder head 14.
[0053]
An air cleaner chamber 44a is formed on the upper portion of the pump cover 44 so as to be separated from the pump housing portion, and the air cleaner element 34a is disposed in the air cleaner chamber 44a to constitute the air cleaner 34 described above. The air outlet of the air cleaner 34 opens toward the V bank side. An upstream end opening 33 a of the intake duct 33 is connected to the air outlet, and a downstream end opening of the intake duct 33 is connected to a right opening of the air chamber 32.
[0054]
The fuel pump 36 is driven by the end of the crankshaft 18 opposite to the fuel pump 36 through a drive system including a gear type coupling 45, a power transmission shaft 46 and a power transmission mechanism 47.
[0055]
The fuel pump 36 is disposed such that the drive shaft 36b is parallel to the crankshaft 18, the drive boss portion 36a is located at the right end of the V bank, and the drive shaft 36b is located within the V bank. Are arranged to be. The coupling 45 has a configuration in which an external gear 45b integrally formed with the distal end portion 46a of the power transmission shaft 46 is engaged with an internal gear 45a fitted and mounted on the drive shaft 36b and locked by a nut 36e. is there. The internal gear 45a is formed so as to cross the axial center in the radial direction and extend in the axial direction so that the diameter can be reduced by a slit 45c that bisects the internal gear 45a. The backlash between the internal gear 45a and the external gear 45b can be absorbed by tightening a bolt 45d inserted in a direction perpendicular to the slot 45c.
[0056]
The power transmission shaft 46 is disposed in parallel with the crankshaft 18, and a power transmission mechanism 47 that transmits power between the base end portion 46 b of the transmission shaft 46 and the crankshaft 18 includes a left case cover (another case cover). ) It is pivotally supported by a drive case 48 integrally formed so as to extend upward from 50 toward the bottom of the V bank.
[0057]
The left case cover 50 has a two-part structure of a base portion 50a fixed to the left side surface of the crankcase 12 and a cover portion 50b fixed to the outside thereof. Accordingly, the drive case portion 48 also includes a base portion 48a fixed to the crankcase 12 side and a cover portion 48b fixed to the outside thereof. The left case cover 50 covers the small reduction gear 51c mounted on the left end of the crankshaft 18 and the clutch mechanism 49 mounted on the left end of the main shaft 51a.
[0058]
The power transmission mechanism 47 includes a drive sprocket 47a formed integrally with the reduction small gear 51c and key-coupled to the left end portion of the crankshaft 18, and an intermediate sprocket 47b supported by the drive case portion 48 via a bearing. Are connected by a chain 47c, and a drive gear 47d fixed to the intermediate sprocket 47b and a driven gear 47e fixed to the base end portion 46b of the power transmission shaft 46 are engaged with each other.
[0059]
In the present embodiment, the common rail 41c is disposed so as to cross the V bank in the direction perpendicular to the crankshaft, and the front and rear ends of the common rail 41c are connected to the front and rear fuel injection valves 37 and 37 '. A fuel supply device 35 having a simple structure suitable for a cylinder engine can be realized, and the area around the V bank space can be made compact. That is, in the case of the V-type two-cylinder engine, since there are only two sets of the front and rear cylinder units 10 and 11, the length of the V bank space in the crankshaft direction is short, and the common rail is directed in the crankshaft direction as in the conventional structure. The common rail easily interferes with other in-vehicle components, and there is a concern that the V bank space cannot be configured compactly.
[0060]
An air chamber 32 common to the front and rear cylinder units 10 and 11 is disposed below the common rail 41c so as to substantially cover the V bank space, and the bottom surface of the air chamber 32 and the front and rear cylinders are arranged. Since the external connection opening 14d of the intake port that opens to the V bank side of the units 10 and 11 is connected, the structure of the intake device can be a simple structure suitable for the V-type 2-cylinder engine. The area around the V bank space can be made compact.
[0061]
Further, since the front and rear fuel injection valves 37 and 37 'are disposed substantially parallel to the cylinder axis and on the front side and the rear side of the common rail 41c in the axial direction from the air chamber 32, the air chamber is utilized using the V bank space. 32 and the common rail 41c are not hindered when the fuel injection valve 37 is disposed in the air chamber 32 or the like.
[0062]
Furthermore, since the glow plug 40 is disposed so that the heating portion 40a at the front end is positioned substantially at the center of the combustion chamber a and the power supply end portion 40b is inclined away from the cylinder shaft outward in the crankshaft direction, When the air chamber 32, the common rail 41c, and the like are arranged using the space, the air chamber 32 and the like do not hinder the arrangement of the glow plug 40.
[0063]
Further, the rocker side mounting boss 15d is formed so as to connect the exhaust side portion and the intake side portion of the rocker support 15a, and the glow plug 40 is screwed and fixed thereto. The main body portion 40c only needs to cross the passage a formed by the rocker support 15a and the cylinder head 14 obliquely, and the passage a through which the traveling wind flows is not blocked by the arrangement of the glow plug 40, and the cylinder head 14 The cooling performance around the combustion chamber can be ensured.
[0064]
Furthermore, since the front and rear fuel injection valves 37, 37 'are arranged so as to face the upper side between the left and right main frames 2c, 2c in plan view, by removing the fuel tank 8, The front and rear fuel injection valves 37 and 37 ′ can be attached to and detached from the front and rear cylinder units 10 and 11 with the engine unit 7 mounted on the vehicle body. Therefore, a fuel supply device such as the fuel injection valve 37 is attached to the engine unit 7. After mounting, it is not always necessary to mount the engine unit 7 on the vehicle body frame, and the degree of freedom in engine assembly can be increased.
[0065]
Further, the front and rear cylinder units 10 and 11 are arranged so as to be displaced in the crankshaft direction, and the front and rear pressing members 38 for pressing and fixing the front and rear fuel injection valves 37 and 37 'to the cylinder head. , 38 'are disposed inside the displacement direction of the cylinder unit, so that the pressing members 38, 38' can be disposed using the space generated by the displacement, and the attaching / detaching operation of the pressing members 38, 38 'is performed as described above. The problem of being obstructed by interference with the left and right main frames 2c, 2c can be suppressed.
[0066]
The fuel supply pump 36 is disposed on the right side of the V bank in the vehicle width direction, and a pump support portion 42c is formed on the gear case 42 attached to the crankcase 12 so as to extend to the V bank side. The fuel supply pump 36 is supported by 42c, and the drive shaft 36b of the fuel supply pump 36 is directed inward in the vehicle width direction and positioned on the V bank inner side than the pump support part 42c. Even in the case of an engine having a small sandwich angle, the fuel supply pump 36 can be arranged near the V bank space without adding a dedicated pump support member.
[0067]
The drive system of the fuel supply pump 36 is configured so that the drive force is taken out from the left end side of the crankshaft 18 and transmitted to the fuel supply pump 36 through the V bank. The amount of outward protrusion can be minimized. For example, when the pump is arranged on the right end side of the crankshaft and the power is taken out from the right end side of the crankshaft, the rightward protruding amount of the fuel pump becomes large. As described above, since the amount of protrusion of the fuel pump 36 can be suppressed, it is easy to avoid the fuel pump 36 from interfering with the legs of the driver, and the degree of freedom in setting the driver's seating posture can be increased. it can.
[0068]
In addition, the coupling 45 connected to the drive shaft 36b and the power transmission shaft 46 is a gear type that meshes the internal gear 45a and the external gear 45b, and the internal gear is fixed by tightening the slit 45c with a bolt 45d. Since the diameter can be reduced, the backlash between the internal gear 45d and the external gear 45b can be reduced, the generation of noise can be suppressed, the driving force can be reliably transmitted, and fuel with a stable pressure can be supplied. .
[0069]
Further, the drive case 48 is extended to the V bank side on the left case cover 50 mounted on the other side of the crankcase, and the power transmission mechanism 47 is supported by the drive case 48 so that a dedicated drive system is supported. The increase in the number of members can be suppressed, and the increase in the number of parts and the complexity of the structure can be suppressed.
[0070]
Further, since the pump cover 44 that covers the fuel supply pump 36 is provided and the air cleaner chamber 44a that accommodates the air cleaner element 34a is formed on the upper portion of the pump cover 44 to form the air cleaner 34, it is easy to secure the space for arranging the air cleaner. .
[0071]
Furthermore, since the right inlet of the air chamber 32 and the outlet located on the V bank side of the air cleaner chamber 44a are connected via the air duct 33, the structure of the intake system is complicated while the fuel supply pump 36 is disposed. Can be suppressed.
[0072]
In the first embodiment, the glow plug 40 is supported by the rocker side mounting boss portion 15d formed on the rocker support 15a located above the top wall portion 14h of the cylinder head 14, but the glow plug 40 is As shown in FIGS. 6 and 7, the ceiling wall side mounting boss portion 14 n may be formed on the ceiling wall 14 h of the cylinder head 14, and the glow plug 40 may be screwed and fixed to the boss portion 14 n. .
[0073]
In this case, the top wall side mounting boss portion 14n is positioned between the exhaust side and intake side rocker support portions 14i and 14j of the top wall 14h, and the passage b formed between the support portions is blocked. Form the size without any.
[0074]
With this configuration, substantially the same operational effects as those of the first embodiment can be obtained.
[0075]
In the first embodiment, the air chamber 32 is arranged on the lower side and the common rail 41c is arranged on the lower side. However, as shown in FIG. 8, the air chamber 32 is arranged on the upper side of the common rail 41c. You may arrange | position so that the said V bank space may be covered substantially.
[0076]
In such a configuration, the intake port external connection that opens to the V bank side of the front cylinder unit 10 and the rear cylinder unit 11 and the right and left portions of the bottom surface of the air chamber 32 with the common rail 41c interposed therebetween. The mouth will be connected.
[Brief description of the drawings]
FIG. 1 is a right side view of a motorcycle equipped with a V-type engine equipped with a fuel supply device according to a first embodiment of the present invention.
FIG. 2 is a plan view showing a relationship between a body frame and an engine of the motorcycle.
FIG. 3 is a partial cross-sectional right side view of the engine.
FIG. 4 is a developed sectional plan view of the engine.
FIG. 5 is a plan view of a cylinder head of the engine.
FIG. 6 is a plan view of a cylinder head of an engine according to a second embodiment of the present invention.
FIG. 7 is a cross-sectional side view of the engine according to the second embodiment.
FIG. 8 is a cross-sectional side view of an engine according to a third embodiment of the present invention.
[Explanation of symbols]
10, 11 First and second cylinder units
18 Crankshaft
35 Fuel pump
37, 37 'first and second fuel injection valves
41b Fuel passage
41c common rail

Claims (9)

The first and second cylinder units are arranged so as to form a V bank, and the first and second cylinder units are arranged in the first and second cylinder units of the V-type engine in which a crankshaft is disposed below the bottom of the V bank. In the fuel supply device in which fuel is injected and supplied via the fuel injection valve, a common rail common to the first and second cylinder units is disposed so as to cross the V bank in a direction substantially perpendicular to the crankshaft, A fuel supply device for a V-type engine, wherein one end and the other end of a common rail are connected to the first and second fuel injection valves, and a fuel pump is connected to a middle portion of the common rail via a fuel passage. 2. The air chamber common to the first and second cylinder units according to claim 1 is disposed below the common rail so as to cover at least a part of the V bank space, and the bottom surface of the air chamber and the first A fuel supply device for a V-type engine, wherein an intake port that opens to the V bank side of the second cylinder unit is connected. 2. The air chamber common to the first and second cylinder units according to claim 1 is disposed on the upper side of the common rail so as to cover at least a part of the V bank space, and sandwiches the common rail on the bottom surface of the air chamber. A fuel supply device for a V-type engine, characterized in that the one side, the other side, and an intake port that opens to the V bank side of the first and second cylinder units are connected. 4. The fuel supply device for a V-type engine according to claim 2, wherein the fuel injection valve is disposed substantially parallel to a cylinder axis and outside the air chamber in the axial direction of the common rail. 2. The glow plug according to claim 1, wherein the first and second fuel injection valves are inserted into the cylinder head so as to substantially coincide with the cylinder axis, and heat the fuel injected from the first and second fuel injection valves. The glow plug has a V-shape characterized in that the heating portion at the tip is positioned substantially at the center of the combustion chamber and the feeding end is inclined away from the cylinder shaft outward in the crankshaft direction. Engine fuel supply device. The first and second cylinder units according to claim 5, wherein a cylinder head, a rocker support, and a head cover are stacked and coupled on a cylinder block, and the cylinder head includes a ceiling wall portion that constitutes a ceiling portion of the combustion chamber; A rocker support portion that is separated into an exhaust side portion and an intake side portion and supports the rocker support, and the rocker support has a rocker side mounting boss portion between the exhaust side portion and the intake side portion. A fuel supply device for a V-type engine, characterized in that the glow plug is screwed and fixed to the rocker side mounting boss portion. The first and second cylinder units according to claim 5, wherein a cylinder head, a rocker support, and a head cover are stacked and coupled on a cylinder block, and the cylinder head includes a ceiling wall portion that constitutes a ceiling portion of the combustion chamber; A rocker support part that is separated into an exhaust side part and an intake side part and supports the rocker support, and the top wall part has a top wall side mounting boss part between the exhaust side part and the intake side part. A fuel supply apparatus for a V-type engine, wherein the glow plug is formed so as to be positioned between the two, and the glow plug is screwed and fixed to the top wall side mounting boss. A motorcycle equipped with an engine comprising the fuel supply device according to any one of claims 1 to 7, wherein the engine has the first and second cylinder units directed in the vehicle front-rear direction and the crank. Mounted on the vehicle body frame with the shaft facing in the vehicle width direction, the vehicle body frame is arranged at intervals in the vehicle width direction, and a pair of left and right mains on which the engine is suspended and supported and a fuel tank is mounted A motorcycle comprising a frame, wherein the first and second fuel injection valves are disposed and arranged so as to face upward when located between the left and right main frames in a plan view. In Claim 8, the said 1st, 2nd cylinder unit is arrange | positioned so that it may deviate in a crankshaft direction, and the said 1st, 2nd fuel injection valve was formed so that the combustion chamber might penetrate to a cylinder head. The first and second pressing members are inserted into the valve holes and fixed to the cylinder head by first and second pressing members disposed on the head cover, and the first and second pressing members are displaced from the first and second cylinder units. A motorcycle characterized by being disposed inward of the direction.

Images