JP4603405B2 - Saddle riding vehicle - Google Patents

Description

  The present invention relates to a straddle-type vehicle in which an occupant such as a motorcycle, a buggy, or a snowmobile rides.

  An increasing number of four-wheeled vehicles adopt an in-cylinder direct injection type (direct injection type) engine that directly injects fuel into a combustion chamber during a compression stroke. In this direct injection engine, since the fuel must be injected against the pressure in the combustion chamber, it is necessary to pressurize the fuel to a very high pressure (several MPa to several tens of MPa). Therefore, in addition to the conventional fuel pump (low pressure fuel pump), the fuel supply device for the direct injection engine is provided with a high pressure fuel pump having a function of increasing the fuel pressure.

  Moreover, in an automobile engine currently in use, an overhead camshaft type (OHC type) in which a camshaft is provided above the engine combustion chamber is the mainstream, and above the engine combustion chamber, A valve operating mechanism including an intake valve, an exhaust valve, a camshaft, and the like is disposed. And in order to cover them, a cylinder head cover is provided and the cylinder head upper part of an engine is sealed.

  The high-pressure fuel pump is preferably disposed at a position close to the fuel injection valve. Recently, the high-pressure fuel pump is disposed on the cylinder head cover directly above the camshaft because it employs a type driven by a pump cam provided on the camshaft. It is often attached (see, for example, Patent Document 1).

European Patent Application No. 1515007 (A) specification

  By the way, when a direct injection engine is to be mounted on a saddle-ride type vehicle such as a motorcycle, for example, unlike a four-wheeled vehicle, the space around the cylinder head is particularly restricted by the body frame, so the high-pressure fuel pump is compact. There is a problem that it is difficult to install.

  In view of the above circumstances, an object of the present invention is to provide a straddle-type vehicle in which a fuel pump can be disposed compactly in a space around a narrow cylinder head without interfering with a vehicle body frame.

The straddle-type vehicle according to the first aspect of the present invention is a pair of left and right frame members extending rearward from the head pipe, and is positioned below the pair of left and right frame members, and the axis of the cylinder is inclined forward to the frame member. And a plunger-type pump driven by rotation of a pump cam on a camshaft provided in the cylinder head of the engine, the cylinder head including a cylinder head body and the cylinder A cylinder head cover provided to cover an upper portion of the head body , and the pump has an axis parallel to the cylinder axis so that at least a part of the pump is positioned between the pair of left and right frame members. And the cylinder head cover together with the cylinder head cover by a bolt penetrating the cylinder head cover. Characterized in that the cylinder head body is mounted on the cylinder head cover by being fastened.

  The invention of claim 2 is the saddle riding type vehicle according to claim 1, wherein the intake chamber is formed between the pair of left and right frame members above the engine, and is formed on an upper surface of the intake chamber. An intake outlet connected to the engine, a bottom surface of the intake chamber, and a protrusion projecting into the intake chamber; a top surface of the intake chamber and a wall surface excluding the protrusion; and air in the intake chamber An intake inlet for taking in the air, and the convex portion is formed in an upper portion of the bottom surface of the plunger-type pump.

  A third aspect of the present invention is the saddle riding type vehicle according to the second aspect, wherein the convex portion is formed at the center of the pair of left and right frame members.

  According to a fourth aspect of the present invention, there is provided the saddle riding type vehicle according to the third aspect, wherein the intake inlets are respectively formed at least on the left and right sides in the vehicle body width direction.

  A fifth aspect of the present invention is the saddle-ride type vehicle according to the second aspect, wherein the convex portion has an inclined surface inclined upward.

  A sixth aspect of the present invention is the saddle riding type vehicle according to the fifth aspect, wherein the intake inlet is formed toward an inclined surface of the convex portion.

According to the first aspect of the present invention, even if the height of the pump in the cylinder axial direction increases , the space between the pair of left and right frame members extending rearward from the head pipe can be used without interfering with the frame members . The pump can be arranged compactly in a narrow space. Further, the pump can be mounted on the cylinder head cover by attaching the pump axis parallel to the cylinder axis and fastening the pump together with the cylinder head cover together with the cylinder head cover by a bolt penetrating the cylinder head cover. Further, since the pump can be directly fixed to the highly rigid cylinder head body via the cylinder head cover, the resonance of the cylinder head cover due to the vibration of the pump can be suppressed as much as possible, and the noise reduction effect can be obtained. In addition, the influence of external force on the pump and the influence of high-pressure water during car washing can be eliminated as much as possible, and the radiation sound from the pump can be reduced. Further, since the pump is disposed between the left and right frame members, the weight balance in the left-right direction can be kept good.

  According to the second aspect of the present invention, an intake chamber having an intake outlet on the upper surface is formed between a pair of left and right frame members extending rearward from the head pipe, and a protrusion projecting into the intake chamber is formed on the bottom surface of the intake chamber. Because the intake inlet that takes air into the intake chamber is provided on the upper surface of the intake chamber and the wall surface excluding the convex portion, the air taken into the intake chamber from the intake inlet is guided to the intake outlet while being guided by the convex portion. And can be guided smoothly. Therefore, the drainage effect and the rectification effect of the supercharging traveling wind can be achieved by the convex portion. Moreover, since the convex part is formed in the upper part of the said plunger type pump, a part (upper end) of a pump can be accommodated in the recessed part of the back surface of a convex part, and space-like in arranging a pump Advantages can be obtained.

  According to invention of Claim 3, since the said convex part is formed in the center of a pair of right and left frame members, when arrange | positioning a pump in the center of the vehicle width direction of an engine, a part of pump is made into a convex part. It can be accommodated in a recess on the back side. Further, since the convex portion is in the center, the air taken into the intake chamber can be guided in a balanced manner when being guided to the intake outlet.

  According to the invention of claim 4, since the intake inlets are formed at least on the left and right sides in the vehicle body width direction, air can be taken into the intake chamber from the left and right directions in a balanced manner, and the air taken in from the left and right directions is convex. It can be smoothly guided to the intake outlet by the part.

  According to the fifth aspect of the present invention, since the inclined surface inclined upward is provided on the convex portion, air can be guided to the intake outlet more smoothly.

  According to the invention of claim 6, since the intake inlet is formed toward the inclined surface of the convex portion, the air taken into the intake chamber is applied to the convex portion and guided by the inclined surface. And a good rectifying effect can be obtained.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic side view showing an overall configuration of a motorcycle as a saddle-ride type vehicle according to an embodiment, FIG. 2 is a side view of a main part viewed from the same direction, and FIG. 3 is a side showing an enlarged configuration of the main part. It is sectional drawing. FIG. 4 is an explanatory view of the air flow by providing a relief portion on the bottom wall (partition wall) of the intake chamber to avoid interference with the high-pressure fuel pump, and FIGS. 5 to 9 are diagrams showing configurations of the cylinder head body and the cylinder head cover. It is.

  As shown in FIG. 1, the motorcycle includes a body frame 20, a front wheel 1, a rear wheel 2, an engine 3, a radiator 4, a front fork 5, a bar handle 6, a fuel tank 7, an air cleaner 8, and an element of a fuel supply device. The high-pressure fuel pump 30, the pivot shaft 10, the rear frame 11, the swing arm 12, the power transmission device 13, the seat 14, the exhaust pipe 16, the muffler 17, the front cowl 9, and the like are configured.

  The vehicle body frame 20 has a pair of left and right main frames (frame members) 22 that extend obliquely downward and rearward from a head pipe 21 at the front end. The rear frame 11 is connected to the rear of the main frame 22 on the upper side. A swing arm 12 is coupled to the lower side via a pivot shaft 10 so as to be swingable in the vertical direction. The rear wheel 2 is supported at the rear end of the swing arm 12.

  Further, a bar handle 6 is rotatably supported on the head pipe 21 at the front end of the vehicle body frame 20, and a front fork 5 that is steered by the bar handle 6 is connected to the lower side of the bar handle 6. A front wheel 1 is suspended at the lower end of the fork 5.

  The engine 3 is disposed at the center in the longitudinal direction of the vehicle body and is suspended below the left and right main frames 22 of the vehicle body frame 20. The engine 3 is an in-line four-cylinder engine, which is mounted in a horizontal position with a crankshaft extending horizontally in the vehicle width direction, and the axis of the cylinder 3A above the crankcase is slightly inclined forward. The four exhaust pipes 16 are connected to the exhaust port on the vehicle body front side of the cylinder 3A, and then pass through the lower side of the engine 3 while repeating merging in the middle, and finally are connected to the muffler 17.

  The radiator 4 is disposed at a position substantially the same height as the upper portion of the cylinder 3A in front of the engine 3 with the ventilation surface facing forward. A radiator fan 4A is provided behind the radiator 4. The air cleaner 8 is disposed above the left and right main frames 22, the fuel tank 7 is disposed on the rear side, and the seat 14 on which the rider sits on the rear frame 11 is disposed on the rear side. The power transmission device 13 is disposed on the left side of the rear part of the vehicle body, and the muffler 17 is disposed on the right side of the rear part of the vehicle body along the rear frame 11.

  As shown in FIGS. 2 and 3, the cylinder head 3B of the engine 3 includes a cylinder head body 40 made of aluminum die casting, which is joined to the upper surface of a cylinder block (not shown in FIG. 3) with a bolt 101 with the lower surface aligned. And a cylinder head cover 50 made of the same aluminum die cast provided so as to cover the upper part of the cylinder head main body 40.

  An intake valve (not shown), an exhaust valve (not shown), an intake side camshaft 70, and an exhaust side camshaft 80 (simple in FIG. 6) are provided in the cylinder head 3B including the cylinder head body 40 and the cylinder head cover 50. In particular, a valve operating mechanism comprising the axes 70L and 80L) is provided. The camshafts 70 and 80 on the intake side and the exhaust side are hermetically sealed by aligning the peripheral portion of the lower alignment surface 51 of the cylinder head cover 50 with the upper alignment surface 41 of the cylinder head body 40 via the seal member 60. Is housed inside.

  The high pressure fuel pump 30 is a plunger type that pressurizes fuel sent from a low pressure pump (not shown) by reciprocating the plunger 38 by the rotation of a pump cam 71 provided on the intake side camshaft 70. A pump is provided on a mounting seat 53 projecting from the upper surface of the cylinder head cover 50, with its own axis aligned with the central axis of the intake camshaft 70.

  In this case, as shown in FIGS. 4, 5, 7, and 8, the high-pressure fuel pump 30 is installed at the approximate center in the vehicle width direction of the engine 3, and as shown in FIG. Is disposed on the cylinder head cover 50 so as to enter between the left and right main frames 22. Here, the axis is attached to the cylinder head 3 </ b> B inclined forward, and the axis of the pump 30 is also inclined forward, so that the upper end corner portion of the pump 30 enters the space between the left and right main frames 22. As shown in FIGS. 3 and 5, the high-pressure fuel pump 30 has a cylinder 33 together with the cylinder head cover 50 by means of a bolt 33 penetrating the mounting flange 31 and the boss portions 57 and 58 of the cylinder head cover 50. The head main body 40 is fastened together.

  That is, bolt through holes 57a and 58a corresponding to the screw holes 47a and 48a of the boss portions 47 and 48 on the cylinder head 40 side are formed in the boss portions (cylinder head cover support portions) 57 and 58 of the cylinder head cover 50, respectively. Bolt holes 32 corresponding to the screw holes 47 a and 48 a of the cylinder head 40 and the bolt holes 57 a and 58 a of the cylinder head cover 50 are formed in the mounting flange 31 of the high-pressure fuel pump 30. Then, the bolt 33 is passed through the bolt through hole 32 of the mounting flange 31 and the bolt through holes 57a and 58a of the cylinder head cover 50 in this order from the upper side of the mounting flange 31 and screwed into the screw holes 47a and 48a of the cylinder head body 40. Thus, the high pressure fuel pump 30 is fastened together with the cylinder head body 40 together with the cylinder head cover 50.

  In this case, the mounting flange 31 of the high-pressure fuel pump 30 is provided with a first support portion 31A and a second support portion 31B having bolt through holes 32A and 32B, respectively. The second support portion 31 </ b> B corresponds to a first boss portion (first support portion) 58 formed on the periphery of the cylinder head cover 50, and the second support portion 31 </ b> B is formed on the inner side separated from the periphery of the cylinder head cover 50. This corresponds to the boss portion (second support portion) 57 of the.

  In particular, the second boss portion (second support portion) 57 of the cylinder head cover 50 and the second support portion 31 </ b> B of the high-pressure fuel pump 30 are formed at positions adjacent to the spark plug insertion hole 250. Further, the first boss portion (first support portion) 58 of the cylinder head cover 50 and the first support portion 31A of the high-pressure fuel pump 30 are disposed outside the seal member 60, and the engine 3 to which the pump 30 is attached. Is located above the second boss portion (second support portion) 57 of the cylinder head cover 50 and the second support portion 31B of the high-pressure fuel pump 30.

  Then, the first support portion 31 </ b> A of the mounting flange 31 of the high-pressure fuel pump 30 is overlapped with the first boss portion (first support portion) 58 formed on the peripheral edge of the cylinder head cover 50, and the mounting flange 31 of the high-pressure fuel pump 30. The second support portion 31B is overlaid on a second boss portion (second support portion) 57 formed on the inner side away from the periphery of the cylinder head cover 50, and in this state, the bolt 33 is attached from the upper side of the mounting flange 31. By passing the bolt through holes 32A and 32B of the mounting flange 31 and the bolt through holes 57a and 58a of the cylinder head cover 50 in order and screwing into the screw holes 47a and 48a of the cylinder head body 40, the high pressure fuel pump 30 is Along with the head cover 50, the cylinder head body 40 is attached.

  Further, the position of the mounting bolt 33 in this case is set so as to be opposed diagonally across the central axis 70L of the intake camshaft 70 as shown in FIG. This is because it is effective in avoiding interference between the inner built-up portion for forming the boss portions 47, 48, 57, and 58 and the pump cam 71 as much as possible. Note that the position and number of the mounting bolts 33 may be arbitrarily changed as long as the high-pressure fuel pump 30 can be mounted in a balanced manner. For example, the two may be arranged on a line orthogonal to the central axis 70 </ b> L of the intake side camshaft 70, not on the diagonally opposed position.

  By being fastened with the bolts 33 in this way, the sealing member 60 interposed between the mating surfaces 41 and 51 of the cylinder head cover 50 and the cylinder head main body 40 is crushed by the fixing force and is brought into close contact with the cam chamber. Maintain 52 airtightness.

  As shown in FIG. 10, the end surface 58 c of the boss portion 58 for fastening the bolt on the cylinder head cover 50 side has a fitting groove 51 a of the seal member 60 so that the crushing margin of the seal member 60 is appropriate. It is slightly higher than the surface 51 toward the counterpart boss portion (the boss portion of the cylinder head body 40), and the end surfaces of the boss portions 47, 48, 57, 58 are in direct pressure contact with each other.

  Also, in the cylinder head 3B, as shown in FIG. 3, an oil bath (holds the lubricating oil) for storing the lubricating oil at a level at which at least a part of the sliding contact surface of the pump cam 71 can be constantly immersed. (Concave part) 79 is provided. As shown in FIGS. 6 and 9, the oil bath 79 includes U-shaped ribs 49 and 59 that are continuous with the boss portion 47 of the cylinder head body 40 and the second boss portion 57 of the cylinder head cover 50. The rigidity of the boss portions 47 and 57 is also increased by the presence of the ribs 49 and 59.

  4 (a) and 4 (b), the bottom surface between the main frames 22 is provided between the left and right main frames 22 in which the air cleaner 8 connected to the intake port of the engine 3 is disposed on the upper side. As a result, the intake chamber 122 communicating with the inlet of the air cleaner 8 is formed. The main frame 22 defining the left and right side portions of the intake chamber 122 is provided inside the pair of left and right air ducts 110 extending forward of the vehicle body. The intake air inlets 112 for introducing the traveling wind (air) F1 taken into the intake chamber 122 are respectively opened. Note that the inlet of the air cleaner 8 is connected to an intake outlet 126 opened on the upper surface of the intake chamber 122.

  In addition, the partition wall 120 that defines the bottom surface of the intake chamber 122 has a deformed portion 124 whose lower surface (back surface) is a concave portion 124 a and whose upper surface is a convex portion 124 b that protrudes into the intake chamber 122. The upper end corner of the high-pressure fuel pump 30 is housed in a recess 124 a on the lower surface side of the deformed portion 124 located above the high-pressure fuel pump 30. By accommodating at least a part of the high-pressure fuel pump 30 in the recess 124a on the bottom surface of the intake chamber 122 in this way, the high-pressure fuel pump 30 is arranged in the vehicle width direction of the engine 3 in spite of a very narrow space. The central part can be disposed without interfering with the body frame 20.

  Further, the convex portion 124b on the upper surface side of the deformable portion 124 is located at a location where the air introduced from the intake inlet 112 hits, and the convex portion 124b is shown in FIGS. 4 (b) and 4 (c). As described above, an inclined surface 124c for guiding the air F2 introduced from the intake inlet 112 to the inlet of the air cleaner 8 is provided. The inclined surface 124c is inclined upward and faces the intake inlet 112. The intake inlet 112 only needs to be formed on the upper surface of the intake chamber 122 and the wall surface excluding the convex portion 124b.

  According to the above configuration, the high-pressure fuel pump 30 can be compactly disposed in a narrow space without interfering with the pair of left and right main frames (frame members) 22 extending rearward from the head pipe 21. Further, since the high pressure fuel pump 30 is attached to the cylinder head 3B so that at least a part is located between the left and right main frames 22, the influence of external force on the high pressure fuel pump 30 and the influence of high pressure water during car washing In addition to being eliminated as much as possible, radiation noise from the high-pressure fuel pump 30 can be reduced. In addition, since the high-pressure fuel pump 30 is disposed at the center between the left and right main frames 22, the weight balance in the left-right direction can also be kept good.

  An intake chamber 122 having an intake outlet 126 on the upper surface is formed between a pair of left and right main frames 22 extending rearward from the head pipe 21, and a convex portion 124 b protruding into the intake chamber 122 is formed on the bottom surface of the intake chamber 122. Since the intake inlet 112 for taking air into the intake chamber 122 is provided on the wall surface (on the main frame 22) excluding the upper surface of the intake chamber 122 and the convex portion 124b, the air taken into the intake chamber 122 from the intake inlet 112 is provided. Can be smoothly guided to the intake outlet 126 while being guided by the convex portion 124b. Therefore, the drainage effect and rectification effect of the supercharging traveling wind can be achieved by the convex portion 124b. Moreover, since the convex part 124b is formed in the upper part of the high pressure fuel pump 30, a part (upper corner) of the high pressure fuel pump 30 can be accommodated in the concave part 124a on the back surface of the convex part 124b. A space advantage in arranging the pump 30 can be obtained. Further, since the convex portion 124b is at the center in the vehicle width direction, the air taken into the intake chamber 122 can be guided with good balance when being guided to the intake outlet 126.

  In the present embodiment, since the intake inlets 112 are formed at least on the left and right sides in the vehicle body width direction, air can be taken into the intake chamber 122 from the left and right directions in a balanced manner. Can be smoothly guided to the intake outlet 126 by the convex portion 124b. In particular, since the convex portion 124b is provided with an inclined surface 124c that is inclined upward, air can be guided to the intake outlet 126 more smoothly. Further, since the intake inlet 112 is formed toward the inclined surface 124c of the convex portion 124b, the air taken into the intake chamber 122 is applied to the convex portion 124b and directed to the intake outlet 126 by the guide of the inclined surface 124c. It is possible to provide a good rectifying effect.

  In the present embodiment, the high pressure fuel pump 30 is fastened together with the cylinder head cover 50 to the cylinder head main body 40 with the bolts 33, so that the cylinder head cover is different from the fuel pump fixed to the plate surface portion of the cylinder head cover 50. The high-pressure fuel pump 30 can be fixed almost directly to the highly rigid cylinder head body 40 through the 50 boss portions 57 and 58. Therefore, resonance of the cylinder head cover 50 due to vibration of the high-pressure fuel pump 30 can be suppressed as much as possible, and a noise reduction effect can be obtained.

  Further, since the high-pressure fuel pump 30 is not attached to the plate surface portion of the cylinder head cover 50, it is not necessary to make the plate surface portion thick or provide a reinforcing rib on the back surface of the plate surface portion. As a result, a compact structure can be realized, and unnecessary weight increase and height dimension increase can be suppressed. In addition, except for the boss portions 57 and 58 that are loaded, it is not necessary to increase the strength of other portions of the cylinder head cover 50. Therefore, portions other than the boss portions 57 and 58 are made of a light material such as resin. In addition, the degree of freedom in selecting the material and structure of the cylinder head cover 50 can be expanded. For example, only the portions of the boss portions 57 and 58 can be made of metal, and the other portions can be made by insert molding with resin.

  Further, in the present embodiment, the sliding contact portion between the pump cam 71 and the plunger 38 of the high-pressure fuel pump 30 can be sufficiently lubricated by the lubricating oil accumulated in the oil bath 79. There is no worry of poor lubrication.

  In the present embodiment, the first support portion 31 </ b> A and the second support portion 31 </ b> B are provided on the mounting flange 31 of the high-pressure fuel pump 30, and the first support portion 31 </ b> A of the pump 30 is disposed on the periphery of the cylinder head cover 50. The formed first boss portion (first support portion) 58 is overlapped with a bolt 33 and fastened with a bolt 33, and the second support portion 31 </ b> B of the pump 30 is formed on the cylinder head cover 50 at a position separated from the periphery of the cylinder head cover 50. Since it overlaps with the 2nd boss | hub part (2nd support part) 57 and it fastens with the volt | bolt 33, the pump 30 and the cylinder head cover 50 can be combined with the cylinder head main body 40 still more firmly.

  In addition, since the second support portion 31B of the high-pressure fuel pump 30 is provided adjacent to the insertion hole 250 of the spark plug, the second support portion 31B can be easily supported under a high rigidity condition. Furthermore, the first boss portion (first support portion) 58 of the cylinder head cover 50 and the first support portion 31A of the pump 30 are formed outside the seal member 60 that ensures airtightness between the cylinder head cover 50 and the cylinder head body 40. Therefore, the cam chamber 52 is easy to keep airtight.

  In the above-described embodiment, the example in which the air duct 110 different from the vehicle body frame 20 is extended to the front of the vehicle body has been described. However, as illustrated in FIG. 11, the internal space of the vehicle body frame 20B is formed on both sides of the head pipe 21. The present invention can also be applied to the case where the duct passage 130 is used. In that case, intake air inlets (not shown) are opened in the left and right front portions or left and right side portions of the intake chamber 122, so that traveling wind enters from there toward the convex portion 124 b in the intake chamber 122. That's fine.

  Moreover, although the case where the high pressure fuel pump 30 was attached was demonstrated in the said embodiment, this invention is applicable also when attaching another pump.

  In the above-described embodiment, the case where the high-pressure fuel pump 30 is attached to the single-row multi-cylinder engine 3 has been described. The present invention can also be applied when a high-pressure fuel pump is attached to a V-shaped engine. In that case, a high-pressure fuel pump is attached to the cylinder head cover of the forwardly inclined cylinder row.

1 is a schematic side view showing an overall configuration of a motorcycle as a saddle riding type vehicle according to an embodiment of the present invention. FIG. 2 is a side view of the main part of the motorcycle as viewed from the same direction as in FIG. 1. FIG. 3 is a side cross-sectional view showing an enlarged main part configuration of FIG. 2. (A) is a plan view of the main frame (a pair of left and right frame members) of the motorcycle as viewed from below, (b) is a sectional view taken along the arrow IVb-IVb in (a), and (c) is a traveling wind. It is a schematic explanatory drawing which shows the flow of. It is a perspective view which shows the structure of the cylinder head part of the engine mounted in the said motorcycle. It is a disassembled perspective view of the cylinder head. It is a schematic plan view of the cylinder head. It is a side view of the cylinder head. It is the top view seen from the mating face side of the cylinder head cover which comprises the cylinder head. It is an expansion perspective view of the boss | hub part for the bolt fastening of the cylinder head cover. It is a figure similar to Fig.4 (a) in other embodiment of this invention.

Explanation of symbols

3 Engine 3A Cylinder 3B Cylinder head 8 Air cleaner 20 Body frame 21 Head pipe 22 Main frame (a pair of left and right frame members)
30 High Pressure Fuel Pump 31 Mounting Flange 31A First Support Portion 31B Second Support Portion 33 Bolt 38 Plunger 40 Cylinder Head Body 47, 48 Boss Portion 57 Second Boss Portion (Second Support Portion)
58 1st boss | hub part (1st support part)
50 Cylinder head cover 70 Intake side camshaft 71 Pump cam 79 Oil bath (recess for holding lubricating oil)
112 Intake inlet 120 Bulkhead 122 Intake chamber 124a Concavity 124b Convex portion 124c Guide wall 126 Inlet outlet

Claims (6)

A pair of left and right frame members extending rearward from the head pipe;
An engine positioned below the pair of left and right frame members and supported by the frame members by tilting the axis of the cylinder forward;
A plunger type pump driven by rotation of a pump cam on a camshaft equipped in a cylinder head of the engine,
The cylinder head has a cylinder head main body, and a cylinder head cover provided to cover an upper portion of the cylinder head main body,
The pump is mounted in parallel with the cylinder axis so that at least part of the pump is positioned between the pair of left and right frame members, and with the cylinder head cover by a bolt penetrating the cylinder head cover. A straddle-type vehicle characterized in that it is mounted on the cylinder head cover by being fastened together with the cylinder head body . A straddle-type vehicle according to claim 1,
An intake chamber formed between the pair of left and right frame members above the engine;
An intake outlet formed on the upper surface of the intake chamber and connected to the engine;
A convex portion formed on the bottom surface of the intake chamber and protruding into the intake chamber;
An intake inlet formed on a wall surface excluding an upper surface of the intake chamber and the convex portion, and an intake inlet for taking air into the intake chamber;
The straddle-type vehicle, wherein the convex portion is formed at an upper portion of the bottom surface of the plunger pump. A straddle-type vehicle according to claim 2,
The straddle-type vehicle, wherein the convex portion is formed at the center of the pair of left and right frame members. A straddle-type vehicle according to claim 3,
The straddle-type vehicle, wherein the intake inlets are formed at least on the left and right in the vehicle body width direction. A straddle-type vehicle according to claim 2,
The straddle-type vehicle, wherein the convex portion has an inclined surface inclined upward. A straddle-type vehicle according to claim 5,
The straddle-type vehicle, wherein the intake inlet is formed toward an inclined surface of the convex portion.

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