JP4522931B2 - Vehicle intake duct mounting structure - Google Patents

Description

  The present invention relates to an intake duct mounting structure for a vehicle such as a motorcycle.

  In Patent Document 1 below, a fuel supply device (intake device) is provided in an engine supported by a vehicle body frame, an intake duct is connected to the fuel supply device, and the intake duct is connected to an intake duct opening of an air cleaner box. A motorcycle is disclosed which is inserted and mounted in the air cleaner box.

  The vehicle body frame has a head pipe and a main frame extending rearward from the head pipe. The main frame has a single monocoque structure and has a cavity inside. By utilizing this cavity, the main frame itself constitutes an air cleaner box, and the intake duct is attached to the main frame.

  FIG. 7 is a side cross-sectional view showing the air cleaner box of Patent Document 1. As shown in FIG. An intake duct opening 102 is formed in the lower wall 101 of the air cleaner box (main frame) 100, and an intake duct 103 is inserted into the intake duct opening 102. On the outer periphery of the intake duct 103, a flange 105 having a bolt insertion hole 104 is provided projecting radially outward.

A bolt insertion hole 106 is formed in the peripheral portion of the intake duct opening 102, and a nut 107 is fixed to the lower surface side of the bolt insertion hole 106. Then, the intake duct 103 is inserted into the intake duct opening 102 from above, and bolts 108 are inserted into the bolt insertion holes 104 of the flange 105 and the bolt insertion holes 106 at the periphery of the intake duct opening 102. The air intake duct 103 is fixed to the air cleaner box 100 by being screwed into the nut 107.
Japanese Patent No. 2963445

  In the case of a general motorcycle in which the air cleaner box and the main frame are configured separately, the air cleaner box can be attached based on the engine, so that there is little error in the relative position between the two. However, as in Patent Document 1 shown in FIG. 7, if the air cleaner box 100 is configured by the main frame itself, the position of the air cleaner box 100 with respect to the main frame is fixed, so the air is taken with reference to the engine 110. It is difficult to set the position of the cleaner box 100. Therefore, an error may occur in the relative position between the engine 110 and the air cleaner box 100.

  Since the intake duct 103 described in Patent Document 1 is fixed to the air cleaner box 100 with bolts 108, an error in the direction of the axis O1 of the intake duct 103 occurs in the relative position between the air cleaner box 100 and the engine 110. The error needs to be absorbed by the fitting portion 112 between the fuel supply device 111 and the intake duct 103.

  However, if the error is absorbed in this way, the length (substantial intake duct length) L from the connecting pipe end of the fuel supply device 111 to the inlet end of the intake duct 103 is a desired length (design value). The fluctuation will greatly affect the engine performance.

  The present invention has been made in view of such circumstances, and even if there is an error in the relative position between the engine and the intake box, the substantial length of the intake duct is made constant, and the desired engine performance is achieved. It is an object to provide a vehicle intake duct mounting structure that can be obtained.

According to the first aspect of the present invention, an intake duct is connected to an intake device provided in the engine, and the intake duct is inserted into an intake duct opening formed in the intake box in the axial direction of the intake duct to be connected to the intake box. In the vehicle intake duct mounting structure to be mounted, the intake duct is inserted into the intake duct opening so as to be positionally adjustable in the axial direction, and is fitted to an end of the intake duct. The joint portion is fitted and fixed to the intake port of the intake device .

  According to this, even if an axial error of the intake duct occurs in the relative position between the engine and the intake box, the error can be absorbed by adjusting the position of the intake duct with respect to the intake duct opening. Therefore, the positional relationship between the intake device and the intake duct can be set accurately, the substantial length of the intake duct can be made constant, and desired engine performance can be obtained.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the intake box is constituted by a frame itself supporting the engine.

  In the vehicle having such a configuration, it is difficult to accurately set the relative position between the intake box and the engine. Therefore, it is more effective to provide the intake duct so that the position of the intake duct can be adjusted in the axial direction with respect to the intake duct opening.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a seal member that is in contact with an outer peripheral surface of the intake duct is provided at a peripheral edge of the intake duct opening. The seal member is slidably inserted.

  According to this, airtightness between the intake duct and the intake duct opening can be maintained by the seal member, and the axial position of the intake duct can be easily adjusted.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the intake duct has a core material on an outer peripheral surface with which the seal member comes into contact.

According to this, the intake duct can increase the rigidity of the contact surface with respect to the seal member, and can improve the airtightness between the intake duct and the seal member.

A fifth aspect of the present invention is a motorcycle having the intake duct mounting structure according to any one of the first to fourth aspects, wherein air is guided to the intake device from the front of the vehicle. is there.

According to this, the substantial length of the intake duct of the motorcycle can be made constant, and the desired engine performance of the motorcycle can be obtained.

According to a sixth aspect of the present invention , an intake duct is connected to an intake device provided in an engine, and the intake duct is inserted into an intake duct opening formed in the intake box in the axial direction of the intake duct to be inserted into the intake box. In the vehicle intake duct mounting structure to be mounted, the intake duct is inserted into the intake duct opening so as to be positionally adjustable in the axial direction, and the intake duct is disposed at a peripheral edge of the intake duct opening. A seal member that contacts the outer peripheral surface of the duct is provided, the intake duct is slidably inserted into the seal member, and an engagement portion is provided on one of the seal member or the intake duct, On the other hand, there is provided an engaged portion that is engageable with the engaging portion and positions the intake duct in the circumferential direction with respect to the seal member by being engaged. The features.

According to this, even if an axial error of the intake duct occurs in the relative position between the engine and the intake box, the error can be absorbed by adjusting the position of the intake duct with respect to the intake duct opening. Therefore, the positional relationship between the intake device and the intake duct can be set accurately, the substantial length of the intake duct can be made constant, and desired engine performance can be obtained.
In addition, a seal member that is in contact with the outer peripheral surface of the intake duct is provided at the periphery of the intake duct opening, and the intake duct is slidably inserted into the seal member. The airtightness between the duct opening and the opening can be maintained, and the position of the intake duct in the axial direction can be easily adjusted.
In addition, an engagement portion is provided on one of the seal member or the intake duct, and on the other side, the engaged portion is engageable with the engagement portion and positions the intake duct in the circumferential direction with respect to the seal member. Since the portion is provided, the intake duct can be easily and quickly mounted in an appropriate direction.

  According to the present invention, even if an error occurs in the relative position between the engine and the intake box, the substantial length of the intake duct can be made constant and desired engine performance can be obtained.

[Overall structure of motorcycle]
FIG. 1 is a side view of a motorcycle 10 as a vehicle according to an embodiment of the present invention. The motorcycle 10 includes a vehicle body 11 having a vehicle body frame (frame of the present invention) 12, an engine 13, a swing arm 22, and the like, and a cowling 14 that covers the outer surface of the vehicle body 11. The vehicle body frame 12 is configured by a main frame 15, a swing arm bracket 16, and a rear frame 17 in a substantially Y shape when viewed from the side.

  The main frame 15 extends rearward from the head pipe 18 and is curved downward. The swing arm bracket 16 is provided as a pair of left and right, and protrudes downward from the left and right sides of the rear end (lower end) of the main frame 15. It extends in a shape. The main frame 15 and the swing arm bracket 16 are integrally formed. The rear frame 17 is fixed to the upper part of the swing arm bracket 16 and extends rearward and upward. A front fork 19 is supported on the head pipe 18, a handle 20 is provided at the upper end of the front fork 19, and a front wheel 21 is supported at the lower end of the front fork 19.

  A swing arm 22 is supported on the swing arm bracket 16 so that the swing arm 22 can swing up and down around the pivot shaft 22 </ b> A at the front end portion, and a rear wheel 23 is supported at the rear end portion of the swing arm 22. A rear suspension (not shown) is interposed between the swing arm 22 and the vehicle body frame 12 so as to extend and contract.

  A fuel tank 25, a seat 26, and a rear seat 27 are provided in order from the front side on the upper side of the vehicle body frame 12. The fuel tank 25 is disposed from the upper side of the main frame 15 to the upper side of the rear frame 17, and the seat 26 and the rear seat 27 are provided on the rear frame 17. An engine 13 is disposed below the main frame 15.

  FIG. 2 is a side view of the main frame 15 and the swing arm bracket 16. The main frame 15 has a single outer shell structure (monocoque structure). The outer shell of the main frame 15 constitutes a strength member, and the inside is a cavity. The main frame 15 constitutes an air cleaner box (intake box) 30 by using an internal cavity, and air supplied to the engine 13 passes through the internal cavity.

  The engine 13 is supported on the main frame 15 and the swing arm bracket 16 via a bracket or the like. The engine 13 of this embodiment is a parallel 4-cylinder, and each cylinder is provided with an intake device (fuel supply device) including a throttle body 34, and an intake duct 33 is connected to each throttle body 34. Each intake duct 33 is attached to a lower wall on the rear side of the air cleaner box 30. As shown in FIG. 3, the throttle body 34 is provided with an injector 34 </ b> B and a throttle valve is disposed therein.

[Configuration of air cleaner box]
A cleaner element 31 is mounted in the air cleaner box 30, and air inlets 32 are formed on the left and right side walls of the air cleaner box 30 on the front side of the cleaner element 31. A duct (not shown) that guides air sucked from the front portion of the motorcycle 10 to the intake port 32 is connected to the intake port 32.

  As for the main frame 15 which comprises the air cleaner box 30, the front side is shape | molded by the casting with the head pipe 18, and the rear side is formed by sheet metal. The front side of the casting and the rear side of the sheet metal are joined slightly behind the cleaner element 31 (the boundary is indicated by Z), and the inlet 32 and the mounting portion of the cleaner element 31 are formed by casting. It is molded integrally.

  FIG. 3 is a side sectional view of the air cleaner box 30 and shows a state before the intake duct 33 is mounted. An air intake duct opening 42 for mounting the air intake duct 33 is formed in the lower wall 30 </ b> A of the air cleaner box 30. In the present embodiment, four intake duct openings 42 corresponding to the four intake ducts 33 are provided side by side in the left-right direction.

  A seal member 40 is attached to each intake duct opening 42. The seal member 40 is formed in a ring shape by an elastic material such as rubber, and the outer peripheral portion is attached to the intake duct opening 42, and the inner peripheral surface is in contact with the outer peripheral surface of the intake duct 33. The sealing surface 40A that keeps airtight between the two is configured. An opening 43 for inserting the seal member 40 and the intake duct 33 into the air cleaner box 30 is formed in the upper wall 30 </ b> B of the air cleaner box 30. The opening 43 is closed by a lid (not shown).

  FIG. 4 is an enlarged cross-sectional view showing the seal member 40. The seal surface 40A of the seal member 40 is a tapered surface that is inclined so that the inner diameter gradually decreases from the upper side to the lower side in the direction of the axis O1. On the upper and lower sides of the outer periphery of the seal member 40, flange portions 45 and 46 projecting in the radial direction are formed, and a groove 47 is formed between the upper and lower flange portions 45 and 46. The peripheral edge of the intake duct opening 42 is fitted into the groove 47. The outer diameter of the lower flange 46 is smaller than the outer diameter of the upper flange 45. Further, the outer peripheral surface 46A of the lower flange 46 is a tapered surface that is inclined so that the outer diameter gradually decreases from the upper side to the lower side in the direction of the axis O1.

[Configuration of intake duct]
As shown in FIGS. 3 and 4, the intake duct 33 is formed in a cylindrical shape from rubber, synthetic resin, or the like, and includes a body portion 36 and a fitting portion 37 provided at the lower end portion of the body portion 36. The trunk portion 36 is a funnel type having an enlarged diameter on the inlet end (upper end) side, and includes a core member 38 on the outer periphery of the upper and lower middle portions. The core member 38 is formed of metal, synthetic resin, or the like, and the outer peripheral surface constitutes a contact surface 38A that contacts the seal surface 40A of the seal member 40. The fitting portion 37 has an inner diameter that is substantially the same as or slightly larger than the outer diameter of the intake port 34A of the throttle body 34, and is fitted to the outer peripheral surface of the intake port 34A.

[Intake duct mounting structure]
As shown in FIG. 3, the seal member 40 is mounted in the intake duct opening 42 in advance. This mounting is performed by fitting the seal member 40 into the intake duct opening 42 from above. As indicated by an arrow X, the intake duct 33 is inserted into the seal member 40 from above, and engages the fitting portion 37 of the intake duct 33 with the intake port 34A of the throttle body 34 and from the outside of the fitting portion 37. By tightening the tightening band 48, the throttle body 34 is mounted as shown in FIG.

  As shown in FIG. 4, the outer diameter φA of the body portion 36 (core member 38) of the intake duct 33 is larger than the minimum inner diameter φB of the seal member 40. Therefore, when the body portion 36 of the intake duct 33 is inserted into the seal member 40, the seal member 40 is elastically deformed radially outward and is in close contact with the intake duct 33 within a range indicated by C. The range C is about 1/2 to 2/3 of the height D of the seal member 40. The length E in the axis O1 direction of the contact surface 38A of the trunk portion 36 of the intake duct 33 with respect to the seal member 40 is larger than the height D of the seal member 40. The intake duct 33 is slidable with respect to the seal member 40 in the range of the length E, and the position can be adjusted in the direction of the axis O1 by sliding.

  FIG. 6 is an exploded perspective view showing the intake duct 33, the seal member 40, and the air cleaner box 30. Two of the seal members 40 are integrally formed through a connection portion 49, and are formed in an eight-character shape as a whole. Presents. Further, the left and right side portions of the upper end portion of the intake duct 33 are linearly cut in order to avoid interference with other adjacent intake ducts 33. In the present embodiment, the intake duct 33 is positioned in the circumferential direction as follows so that the cut portion 33A is appropriately disposed on the left and right sides.

  A bar-shaped engaging portion 51 that protrudes upward is integrally provided on the upper surface of each seal member 40, and the upper outer peripheral surface of each intake duct 33 is covered with a pair of protrusions that protrude radially outward. An engaging portion 52 is provided. When the intake duct 33 is inserted into the seal member 40, the engaging portion 51 is inserted between the pair of engaged portions 52, and the engaging portion 51 and the engaged portion 52 are engaged, thereby The direction of the circumferential direction of the duct 33 is set appropriately.

[Effect of this embodiment]
With the configuration described above, the present embodiment has the following effects.
(1) As shown in FIG. 5, the intake duct 33 is slidably inserted into the seal member 40 in the direction of the axis O1, and the mounting position in the direction of the axis O1 can be adjusted. Even if a dimensional error occurs in the direction of the axis O <b> 1 at the relative position between the engine and the engine 13, the error can be absorbed between the seal member 40 and the intake duct 33. Therefore, the substantial length L of the intake duct 33 from the intake port 34A of the throttle body 34 to the inlet end of the intake duct 33 can be accurately set, and desired engine performance can be obtained.

(2) Since the seal surface 40A of the seal member 40 is a tapered surface as shown in FIG. 4, the intake duct 33 is moved in the X direction (FIG. 3) from the larger inner diameter side (upper side) of the seal member 40. Can be inserted easily. Further, it is possible to make it difficult for the intake duct 33 to be pulled out in the direction opposite to the X direction (insertion direction).

(3) Since the outer diameter of the lower flange 46 of the seal member 40 is smaller than the outer diameter of the upper flange 45, as shown in FIG. By mounting 40 from the lower flange 46 side, it can be easily mounted. Also, the outer peripheral surface 46A of the lower flange 46 can be tapered to facilitate attachment to the intake duct opening 42.

(4) As shown in FIGS. 4 and 5, since the intake duct 33 includes the core member 38 on the outer periphery, the rigidity of the contact surface 38 </ b> A with respect to the seal member 40 can be increased. Airtightness can be improved.

(5) As shown in FIG. 5 and FIG. 6, the engagement member 51 is provided in the seal member 40, the engaged portion 52 is provided in the intake duct 33, and both the 51 and 52 are engaged, thereby Since the circumferential positioning is performed, the intake duct 33 can be mounted in an appropriate direction easily and quickly.

(6) The engaging portion 51 of the seal member 40 has a shape protruding in the vertical direction, and the engaged portion 52 of the intake duct 33 has a shape that engages with the engaging portion 51 from both sides in the circumferential direction (left and right). Therefore, even if the mounting position of the intake duct 33 with respect to the seal member 40 is adjusted up and down, the engaged state between the engaging portion 51 and the engaged portion 52 can be maintained.

(7) Since the two seal members 40 are integrally formed via the connecting portion 49, the engaging portion 51 is disposed at an appropriate position simply by mounting the seal member 40 to the intake duct opening 42. be able to.

[Other Embodiments]
(1) The intake duct 33 is not limited to the funnel type in which the diameter of the inlet end is increased, and may be a pipe having a substantially constant diameter. Further, the intake duct 33 may be bent in an L shape or the like.

(2) The intake duct 33 is not limited to being formed of rubber, but can be formed of synthetic resin or metal. Further, the sealing member 40 is not limited to being formed of an elastic material such as rubber, but can be formed of synthetic resin, metal, or the like. However, when one of the intake duct 33 or the seal member 40 is formed of a hard material, the other is preferably formed of an elastic material.

(3) The core material 38 may be omitted.

(4) The engaging portion 51 protruding in the vertical direction may be formed in the intake duct 33, and the engaged portion 52 protruding in the radial direction may be provided in the seal member 40.

(5) In the above-described embodiment, the two seal members 40 are integrally formed via the connection portion 49, but may be formed individually. Also, three or more seal members 40 can be integrally formed.

(6) In the above embodiment, the main frame 15 has a monocoque structure and the main frame 15 itself is the air cleaner box 30. However, the air cleaner box 30 and the main frame 15 may be configured separately.

(7) The intake device 34 is not limited to the throttle body, and may be a carburetor.

(8) The intake box 30 may not include the cleaner element 31.

  The present invention can be applied to various motorcycles such as motorcycles for general use or racing, straddle-type automobiles, small planing boats, and other leisure vehicles.

1 is a left side view of a motorcycle according to an embodiment of the present invention. It is a left view of a vehicle body frame (a main frame and a swing arm bracket). It is side surface sectional drawing which shows an air cleaner box and an air intake duct. It is an expanded sectional view of a seal member. It is side surface sectional drawing which shows an air cleaner box and an air intake duct. It is a perspective view which decomposes | disassembles and shows an intake duct, a sealing member, and an air cleaner box. It is side surface sectional drawing which shows the air cleaner box and intake duct concerning a prior art.

13 Engine 12 Body frame 30 Air cleaner box (intake box)
33 Intake duct 34 Throttle body (intake device)
40 Sealing member 42 Inlet duct opening 45 Hook 46 Hook 47 Groove 51 Engaging portion 52 Engaged portion

Claims (6)

Intake of a vehicle, wherein an intake duct is connected to an intake device provided in the engine, and the intake duct is inserted into an intake duct opening formed in the intake box in the axial direction of the intake duct and attached to the intake box. In the duct mounting structure,
The intake duct is inserted in the axial direction so as to be position-adjustable with respect to the intake duct opening,
An intake duct mounting structure for a vehicle , wherein a fitting portion provided at an end portion of the intake duct is fitted and fixed to an intake port of the intake device .   2. The vehicle intake duct mounting structure according to claim 1, wherein the intake box is configured by a frame itself supporting the engine. A seal member that is in contact with the outer peripheral surface of the intake duct is provided at the periphery of the intake duct opening;
The vehicle intake duct mounting structure according to claim 1, wherein the intake duct is slidably inserted into the seal member. The vehicle intake duct mounting structure according to claim 3, wherein the intake duct has a core on an outer peripheral surface with which the seal member comes into contact. The intake duct mounting structure according to any one of claims 1 to 4,
A motorcycle in which air is guided from the front of the vehicle to the intake device. Intake of a vehicle, wherein an intake duct is connected to an intake device provided in the engine, and the intake duct is inserted into an intake duct opening formed in the intake box in the axial direction of the intake duct and attached to the intake box. In the duct mounting structure,
The intake duct is inserted in the axial direction so as to be position-adjustable with respect to the intake duct opening,
A seal member that is in contact with the outer peripheral surface of the intake duct is provided at the periphery of the intake duct opening;
The intake duct is slidably inserted into the seal member;
One of the seal member or the intake duct is provided with an engaging portion, and the other is engageable with the engaging portion and is positioned in the circumferential direction of the intake duct with respect to the seal member. wherein the engaged portion is provided, multiplication product intake duct mounting structure.

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