JP4456776B2 - Assembly structure of motorcycle cab joint and cleaner case - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an assembly structure of a cab joint and a cleaner case of a motorcycle.
[0002]
[Prior art]
In a motorcycle equipped with a carburetor in the intake system, the carburetor and the cleaner case are connected by a cab joint. Conventional examples of the assembly structure of the cab joint and the cleaner case are shown in FIGS. 11 and 12, respectively.
[0003]
11 and 12 are broken side views showing a conventional cab joint / cleaner case assembly structure. In the assembly structure shown in FIG. 11, the flange portion 114a formed at one end of the cab joint 114 is used as a cleaner. The case 102 and the backup member 116 are sandwiched from both sides, and a plurality of insert bolts 117 erected on the backup member 116 are inserted into the flange portion 114a of the cleaner case 102 and the cab joint 114 and screwed into the end portion of the insert bolt 117. A configuration is adopted in which the cab joint 114 is assembled to the cleaner case 102 by tightening the nut 118 to be tightened.
[0004]
The assembly structure shown in FIG. 12 is a band tightening type, and one end of the cab joint 214 is fitted into the outer periphery of the cylindrical portion of the backup member 216 attached to the outer end surface of the cleaner case 202 with a plurality of rivets 217. A configuration is adopted in which the outer periphery is fastened with a band 219 and the cab joint 214 is assembled to the cleaner case 202.
[0005]
[Problems to be solved by the invention]
However, the conventional assembly structure shown in FIG. 11 requires an appropriate mounting width, and it is necessary to narrow the tightening pitch by the bolt 117 and the nut 118 in order to ensure high sealing performance. If it is narrow, there are problems that the number of tightening points increases and the number of parts and assembly man-hours increase. If the tightening pitch is increased and the number of tightening points is reduced, a new sealing part is required to ensure high sealing performance. In addition, since the cab joint 114 exists in the tightening direction of the nut 118, there is a problem that the assembling property is poor.
[0006]
In the conventional assembly structure shown in FIG. 12, the cab joint 214 is attached to the outside of the cleaner case 202 via the backup member 216, so that the assembly is good. However, the backup member 216 is positioned outside the cleaner case 202. In order to achieve this, a certain amount of installation space is required, and the volume of the cleaner case 202 is reduced by the amount of the band width 219 (the tightening width of the band 219 + the fitting width of the cleaner case 202). There's a problem. In addition, depending on the tightening pitch of the backup member 216 by the rivets 217, the seal member 220 is necessary to ensure the sealing performance, which causes an increase in the number of parts and the seal portion is located outside the cleaner case 202. There is also the problem that water and mud may enter.
[0007]
The present invention has been made in view of the above problems, and the object of the present invention is to reduce the number of parts and improve the assembling property while ensuring high sealing performance without significantly reducing the volume of the cleaner case. An object is to provide an assembly structure of a cab joint and a cleaner case of a motorcycle.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is the assembly structure of the cab joint for connecting the cleaner case and the carburetor to the cleaner case. The configuration is such that the inner periphery of the opening of the cleaner case is directly fitted to the outer periphery of one end of the cab joint and the outer periphery of the end of the cab joint is fastened to the backup member with a band.
[0009]
The invention according to claim 2 is characterized in that, in the invention according to claim 1, a tightening portion by the band of the cab joint is arranged outside the cleaner case.
[0010]
According to a third aspect of the present invention, in the first aspect of the present invention, the tightening portion by the band of the cab joint is arranged inside the cleaner case.
[0011]
Therefore, according to the first and second aspects of the present invention, the cab joint can be fastened to the backup member and the attachment portion (fitting portion) of the cab joint to the cleaner case can be prevented from coming off by tightening the band at one place. Since it is made at the same time, it is possible to reduce the number of parts and improve the assembling property while ensuring high sealing performance. Further, since the volume of the cleaner case is reduced by at least the bandwidth, the influence on the engine can be minimized.
[0012]
According to the invention described in claim 3, since the tightening portion by the band of the cab joint is located inside the cleaner case, the volume of the cleaner case is not reduced, and the tightening portion is not exposed to the outside of the cleaner case. Therefore, the appearance is improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0014]
<Embodiment 1>
1 is a side view of a cleaner case portion of a motorcycle having the structure of the present invention, FIG. 2 is an enlarged sectional view taken along line AA in FIG. 1, FIG. 3 is an enlarged sectional view taken along line BB in FIG. Fig. 5 is a cutaway side view of the cab joint and cleaner case showing the assembly structure according to the invention, Fig. 5 is a view in the direction of arrow C in Fig. 4, Fig. 6 is a sectional view taken along line DD in Fig. 5, and Fig. 7 is Fig. 6. FIG.
[0015]
As shown in FIG. 1, a cleaner case 2 made of resin is disposed below a seat 1 of a motorcycle, and the upper surface, both side surfaces, and the rear surface of the cleaner case 2 are open. The upper surface opening of the cleaner case 2 is covered with a sheet, both side surface openings are covered with left and right side covers 3 made of resin, and the rear surface opening is covered with a resin rear fender 4.
[0016]
Here, as shown in FIG. 2, the front part of each side cover 3 is attached to the side part of the cleaner case 2 with bolts 5 and the rear part is attached to the seat rail 9 with bolts 6 as shown in FIG. It has been.
[0017]
Further, as shown in FIG. 3, both sides of the cleaner case 2 and the rear fender 4 (only one is shown in FIG. 3) are attached to the left and right seat rails 9 by means of bolts 10 and nuts 11 via brackets 8. In FIG. 1, reference numeral 12 denotes an exhaust pipe for exhausting exhaust gas from an unillustrated engine to the rear, and an exhaust muffler 13 is connected to the rear end thereof.
[0018]
By the way, the motorcycle according to the present embodiment includes a carburetor (not shown) in the intake system, and the carburetor and the cleaner case 2 are connected by a cab joint 14 shown in FIGS.
[0019]
The cab joint 14 is integrally formed of an elastic body such as rubber, and its one end 14A constitutes a large-diameter substantially cylindrical portion, and the other end 14B constitutes a small-diameter cylindrical portion. As shown in FIG. 6, the connecting intermediate portion 14 </ b> C constitutes a duct portion having a substantially cross-sectional rectangle that is curved in plan view while avoiding interference with the rear cushion 15.
[0020]
Thus, one end 14A of the cab joint 14 is assembled to the cleaner case 2 by the assembly structure according to the present invention, and the other end 14B is connected to a carburetor (not shown). Here, a fitting groove 14a and a band groove 14b are formed on the outer periphery of one end 14A having a substantially cylindrical shape of the cab joint 14, and a resin backup member 16 is fitted on the inner periphery. Is retained.
[0021]
The backup member 16 has a cylindrical portion 16a and a flange portion 16b formed at a substantially right angle from the cylindrical portion 16a outward in the radial direction, and a boss portion 16c is formed at the center thereof. An insert nut 17 is fixed to a circular hole 16d penetrating the portion 16c.
[0022]
Here, as shown in detail in FIG. 7, the backup member 16 has a cylindrical portion 16 a in which the fitting portion of the backup joint 16 with the cleaner case 2 is deformed in the direction of reducing the radial dimension with respect to the cab joint 14. A portion 16e that backs up the entire circumference from the inside so as to prevent, and a portion 16f that backs up the entire circumference from the inside so that the tightened portion by the band 18 also prevents deformation in the direction of reducing the diameter. have. Further, a single ridge portion 16g is formed on the outer peripheral portion of the portion 16f, and when the cab joint 14 is tightened by the band 18, it is locally deformed at the position of the ridge portion 16g. Therefore, the connection between the backup member 16 and the cab joint 14 is strengthened.
[0023]
On the other hand, as shown in FIGS. 4 and 6, a substantially circular opening 2 a is formed on the front surface of the cleaner case 2, and the inner periphery of the opening 2 a is at one end of the cab joint 14. It is directly fitted in the fitting groove 14a formed on the outer periphery. In actual assembly, one end 14A of the flexible cab joint 14 is deformed from the outside of the cleaner case 2 and the fitting groove 14a formed on the outer periphery thereof is fitted into the opening 2a of the cleaner case 2. After the peripheral edge is directly fitted, the backup member 16 is inserted into the cleaner case 2, and the cylindrical member 16 a is fitted into the inner periphery of one end 14 </ b> A of the cab joint 14 to incorporate the backup member 16 into the cab joint 14. .
[0024]
Thus, when the inner peripheral edge of the opening 2a of the cleaner case 2 is directly fitted into the fitting groove 14a of the cab joint 14 as described above, the band groove 14b formed on the outer circumference of the one end 14A of the cab joint 14 is formed. The band 18 is fitted, and the band 18 is tightened by a bolt 20 inserted into a rib 19 bonded to both ends of the band 18 and a nut 21 (see FIG. 5) screwed to the band 18, and one end of the cab joint 14 is connected to a backup member. 16 is attached.
[0025]
Here, as shown in FIG. 5, the opening shape of the one end 14A of the cab joint 14 has an R (curvature radius) for smoothing the air flow and keeping the suction resistance small, and for the die-cutting property at the time of molding. ) Is formed at the corner, but since the tightening portion of the band 18 is disposed at a position facing the small R portion 14e, the tightening force of the band 18 is changed to the left and right with the tightening portion as a boundary. Become even.
[0026]
When one end of the cab joint 14 is assembled to the cleaner case 2 as described above, the cleaner element 22 is assembled in the cleaner case 2. That is, the cleaner element 22 placed in the cleaner case 2 has one end face abutted against the flange portion 16b of the backup member 16, and passes through a butterfly screw 24 through which a sleeve 23 is provided at the center thereof. The cleaner element 22 is assembled by turning the screw 24 and screwing the tip screw portion thereof to the insert nut 17 fixed to the boss portion 16 c provided on the backup member 16.
[0027]
In a motorcycle having the above-described assembly structure, when an engine (not shown) is started, air is sucked into the crener case 2 by the negative intake pressure generated in the engine, and sucked into the cleaner case 2. The purified air is purified by passing through the cleaner element 22 and then guided to the carburetor (not shown) through the cab joint 14.
[0028]
In the carburetor, the fuel is sucked into the venturi passage by being drawn by the negative pressure generated by the air flow in the venturi passage, and this fuel is mixed with the air flowing therethrough so that a desired air-fuel ratio (A / F) is obtained. An air-fuel mixture is formed.
[0029]
The air-fuel mixture formed in the carburetor as described above is supplied to the engine through an intake pipe (not shown) and used for combustion. The high-temperature exhaust gas generated by the combustion of this air-fuel mixture passes through the exhaust pipe 12. To the exhaust muffler 13 (see FIG. 1) and discharged from the exhaust muffler 13 into the atmosphere.
[0030]
The above-described series of operations are repeated, the engine is continuously operated, and the motorcycle is caused to travel at a predetermined speed by the driving force of the engine.
[0031]
As described above, in the structure for assembling the cab joint 14 to the cleaner case 2 according to the present embodiment, the cab joint 14 is fastened to the backup member 16 and the cab joint 14 is cleaned by fastening the band 18 at one place. Since the attachment part (fitting part) to the case 2 is prevented from coming off at the same time, parts such as bolts, nuts, and seal members that were required in the past are no longer required, and the number of parts can be reduced while ensuring high sealing performance. Assembly can be improved.
[0032]
Further, since the volume of the cleaner case 2 can be reduced by at least the bandwidth b (see FIG. 4), the volume necessary for the cleaner case 2 can be secured and the influence on the engine can be minimized.
[0033]
Further, since the seal portion between the cab joint 14 and the backup member 16 is located inside the cleaner case 2, entry of water and mud from the outside into the seal portion is reliably prevented by the cleaner case 2, and the cab joint A high sealing performance is ensured between 14 and the backup member 16.
[0034]
<Embodiment 2>
Next, an embodiment of the present invention will be described with reference to FIGS. 8 is a cutaway side view of the cab joint and the cleaner case showing the assembly structure according to the present embodiment, FIG. 9 is a view in the direction of arrow F in FIG. 8, and FIG. In these drawings, the same elements as those shown in FIGS. 4 to 7 are denoted by the same reference numerals, and description thereof will be omitted below.
[0035]
Also in the present embodiment, the inner peripheral edge of the opening 2a of the cleaner case 2 is directly fitted to the outer periphery of one end of the cab joint 14 formed by fitting and holding the backup member 16 on the inner periphery of the one end. However, unlike the first embodiment, a tightening portion by the band 18 of the cab joint 14 is arranged inside the cleaner case 2. Yes.
[0036]
Therefore, in this embodiment, the same effect as in the first embodiment can be obtained. However, in this embodiment, the tightening portion by the band 18 of the cab joint 14 is located inside the cleaner case 2, so that the cleaner case The volume of 2 is not reduced, and the tightening portion is not exposed to the outside of the cleaner case 2, so that the appearance can be improved.
[0037]
In the present embodiment, the tightening portion of the cab joint 14 by the band 18 is located inside the cleaner case 2, but the upper surface of the cleaner case 2 is open before being covered with the sheet. Therefore, the band 18 can be easily tightened.
[0038]
【The invention's effect】
As is apparent from the above description, according to the present invention, as a structure for assembling the cab joint for connecting the cleaner case and the carburetor to the cleaner case, the backup member is fitted and held on the inner periphery of one end. Since the inner periphery of the opening of the cleaner case is directly fitted to the outer periphery of the cab joint, and the outer periphery of the cab joint is fastened to the backup member with a band, the volume of the cleaner case is greatly reduced. Therefore, it is possible to reduce the number of components and improve the assembling performance while ensuring high sealing performance.
[Brief description of the drawings]
FIG. 1 is a side view of a cleaner case portion of a motorcycle having the structure of the present invention.
FIG. 2 is an enlarged cross-sectional view taken along line AA of FIG.
FIG. 3 is an enlarged cross-sectional view taken along line BB in FIG.
4 is a cutaway side view of the cab joint and the cleaner case showing the assembly structure according to Embodiment 1 of the present invention. FIG.
5 is a view in the direction of arrow C in FIG.
6 is a sectional view taken along the line DD of FIG.
7 is an enlarged detail view of a part E in FIG. 6;
FIG. 8 is a cutaway side view of a cab joint and a cleaner case showing an assembly structure according to a second embodiment of the present invention.
9 is a view in the direction of arrow F in FIG.
10 is an enlarged detail view of a G part in FIG. 8;
FIG. 11 is a cutaway side view showing a conventional assembly structure of a cab joint and a cleaner case.
FIG. 12 is a cutaway side view showing a conventional assembly structure of a cab joint and a cleaner case.
[Explanation of symbols]
2 Cleaner case 2a Cleaner case opening 14 Cab joint 14a Fitting groove 16 Backup member 18 Band

Claims (3)

An assembly structure of the cab joint for connecting the cleaner case and the carburetor to the cleaner case,
A backup member fitted and held on the inner periphery of one end of the cab joint;
A band for fastening one end outer periphery corresponding to one end inner periphery of the cab joint for fitting and holding the backup member to the backup member;
A fitting portion that is formed on the outer periphery of the cab joint at a position where the backup member is fitted and held and directly fits the inner periphery of the opening of the cleaner case;
A cleaner element fixed to the backup member;
Consisting of
In the cleaner case, the cleaner element is fixed to the backup member in a state where one end surface is in contact with the backup member.
The assembly structure of the cab joint and cleaner case of a motorcycle characterized by this.   2. The assembly structure of a cab joint and a cleaner case for a motorcycle according to claim 1, wherein a tightening portion by the band of the cab joint is disposed outside the cleaner case.   2. The assembly structure of a cab joint and a cleaner case for a motorcycle according to claim 1, wherein a tightening portion by the band of the cab joint is disposed inside the cleaner case.

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