JP3089275B2 - Air cleaner for motorcycles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a motorcycle air cleaner device used for a motorcycle equipped with a two-stroke engine.

[Conventional technology]

Conventionally, as an off-road motorcycle equipped with a two-stroke engine, there is an off-road motorcycle in which an air cleaner case is disposed below a seat and between an engine and rear wheels.
In this air cleaner case, electric components such as a battery, components such as an oil tank for separating lubrication and a cushion unit for a rear wheel are arranged together with the air cleaner case in a space below the seat, so that interference with these components is avoided. It was formed as small as possible with the minimum required capacity. In addition, this type of motorcycle has a race specification by removing security parts and the like for driving on public roads.
The table may be used for multiple purposes. At the time of the race specification, an oil pump and an oil tank for separating refueling were also removed by using a mixed oil mixed with oil as fuel, thereby reducing the weight of the vehicle body.

[Problems to be solved by the invention]

However, in the motorcycle described above, even if safety parts, unnecessary parts for lubrication system, etc. are removed and the race specification is adopted, the performance of the engine cannot always be fully exhibited. This is because the air cleaner case is formed only with a minimum necessary capacity, and the capacity is not sufficient. That is, if the capacity of the air cleaner case is small, the responsiveness of the engine to the accelerator operation cannot be improved.

[Means for solving the problem]

In a motorcycle air cleaner device according to the present invention, a box-shaped air cleaner case is formed by a main body and a lid so as to be divided into two in the vehicle width direction, and the main body is fixed to a body frame, and the lid is attached to the main body. A detachable direction is detachably mounted by a screw in the vehicle width direction, an intake duct communicating the air cleaner case and the carburetor is connected to a front wall of the body of the main body, and a bottomed cylindrical shape is formed inside the air cleaner case on the wall. An air cleaner element is mounted, the air intake duct is connected to the air cleaner element, and a suction pipe for guiding outside air into the air cleaner case is attached to the upper wall of the lid so that the downstream end faces the air cleaner case. An oil tank is arranged on the upper side of the case behind the air cleaner element on the side of the downstream end of the pipe and behind the air cleaner element. The oil tank is held by a support piece protruding from an inner wall surface of the main body and an oil tank oil supply portion penetrating through the upper wall of the main body and protruding outside the main body, and a vehicle width direction opposed to the lid in the oil tank. Is fixed to the lid with a mounting screw passing therethrough.

(Operation)

By removing the oil tank from the air cleaner case, the substantial capacity of the air cleaner case is increased by the amount of the oil tank. Further, the screw for connecting the main body and the lid of the air cleaner case and the mounting screw for fixing the oil tank to the lid can be detached and attached in the same direction as the detachment of the lid. Since the suction pipe is removed together with the lid, the work of attaching and detaching the oil tank is not blocked by the suction pipe.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 is a side view showing a motorcycle employing a motorcycle air cleaner device according to the present invention, FIG. 2 is an enlarged plan view showing the air cleaner device according to the present invention, and FIG. 3 is III in FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. In these figures, reference numeral 1 denotes a body frame, and 2 denotes a body mounted on the body frame 1.
In the cycle engine, the engine 2 is of a separate oil supply type having an oil pump (not shown) and an oil tank described later. Reference numeral 3 denotes a front fork for suspending the front wheel 4, and the front fork 3 is rotatably supported by the body frame 1. Reference numeral 5 denotes a rear arm that supports a rear wheel 6, and the rear arm 5 is swingably provided on the vehicle body frame 1 via a pivot shaft 7. Reference numeral 8 denotes a rear wheel cushion unit.
Is interposed between the body frame 1 and the rear arm 5 via a link member 8a. 9 is a fuel tank,
Reference numeral 10 denotes a sheet, 11 denotes a carburetor, and an air cleaner 12 is attached to an air inlet of the carburetor 11.

As shown in FIGS. 2 to 4, the air cleaner device 12 includes an air cleaner case 14 communicated with the carburetor 11 via an intake duct 13, an air cleaner element 15 built in the air cleaner case 14, and the like. It is configured.

The intake duct 13 is formed to bend so as to bypass the left side of the cushion unit 8.
Is connected to the air cleaner case 14 right behind.

The air cleaner case 14 includes a left case 16 and a right case.
17 and the left and right cases 16 and 17 are assembled in such a manner that a sealing member 18 made of a rubber material is sandwiched over the entire periphery of the mating portion of the left and right cases 16 and 17. The left case 16 constitutes a main body of the air cleaner case according to the present invention, and the right case 17 constitutes a lid. Reference numeral 19 denotes a screw for connecting the left and right air cleaner cases 16, 17 to each other. As shown in FIGS. 2 and 3, the screw 19 is mounted so that the mounting / removing direction is the vehicle width direction. The air cleaner case 14
, The cushion unit 8 and the body frame 1
Is located between the back stay 1a and the mounting screw
20, 21 support the seat rail 1b of the body frame 1. Both of these mounting screws 20 and 21 are provided on the upper part of the left case 16, the front part of the air cleaner case 14 is mounted on the bracket of the left seat rail 1b by the mounting screw 20, and the rear part is mounted on the left and right seat rails by the mounting screw 21. Each is supported by a bracket of the member 1c.
Note that cushion rubbers 22 are interposed at the front and rear fixed portions, respectively. That is, the air cleaner case 14 is elastically supported by the vehicle body frame 1 by the mounting screws 20 and 21 and the cushion rubber 22.

A tubular boss 16a for fitting and connecting the intake duct 13 is integrally formed on a front wall of the left case 16, and an opening for taking an air cleaner element 15 described later into and out of the case is formed on a left side wall. A part is formed. Further, the right case 17 is provided with a suction pipe 23 for guiding outside air into the case. The downstream end of the suction pipe 23 faces the inside of the air cleaner case 14, as shown in FIG.

The air cleaner element 15 is formed in a substantially cylindrical shape with a bottom, and is a conventionally well-known element which is clamped and held by an element holder 15c by an element guide 15a and a tightening bolt 15b. The air cleaner element 15 is mounted on the air cleaner case 14 by fitting an outer peripheral portion of the element holder 15c into a guide groove 16b of the left case 16. The guide groove 16b is formed integrally with the front wall of the left case 16, and is formed in a horizontal U-shape when viewed from the front of the case so that both ends communicate with the left opening of the left case 16. That is, the air cleaner element 15 is positioned and held at a predetermined position by the guide groove 16b when mounted in the air cleaner case 14. To replace the air cleaner element 15, the element holder 15c is moved to the left side along the guide groove 16b, and is taken out of the left opening of the left case 16 and taken out of the case.

Reference numeral 24 denotes a cover for closing the left opening of the left case 16 from the outside. The cover 24 has a front end connected to the left case 16 via a detachable hinge, and a rear end provided with mounting screws 24a.
Screwed to the left case 16. The hinge includes a gate-shaped support member 16c protruding from the left case 16,
A hook 24b is provided to protrude from the cover 24 and is inserted into and engaged with the opening of the support member 16c. In addition,
A sealing member 24c is interposed over the entire periphery of the joint between the cover 24 and the left case 16.

25 is an oil tank for storing engine oil,
The oil tank 25 is installed in the upper part of the air cleaner case on the side of the downstream end of the suction pipe 23 and behind the air cleaner element 15 behind the vehicle body. The oil supply section 25a of the oil tank 25 penetrates the upper wall of the left case 16 and projects outside the case. The oil tank 25 is positioned at a predetermined position in the case by the support piece 16d protruding from the left case 16 and the penetrating portion, and in this state, the right end is fixed to the right case 17 by the mounting screw 25b. ing. In the oil tank 25, the oil is configured to be discharged from the bottom of the air cleaner case 14 via the oil discharge pipes 25c and 25d.

In the air cleaner device 12 configured as described above, the air cleaner case 14 is formed with a dimension such that a required minimum capacity can be obtained with the oil tank 25 attached. Also, this air cleaner case 14
Loosen and remove 19, disassemble the left and right cases 16, 17 apart, and loosen the mounting screw 25b to remove the oil tank 2
5 can be removed. And this oil tank 25
Is mounted in the air cleaner case 14 during normal running, and is removed from the air cleaner case 14 for racing specifications. When the vehicle travels with the oil tank 25 removed, the open portion of the oil outlet pipe 25c is closed and oil is previously mixed with the fuel at a predetermined mixing ratio.

Therefore, in the air cleaner device 12 configured as described above, by removing the oil tank 25 from the air cleaner case 14, the substantial capacity of the air cleaner case 14 can be increased by the amount of the oil tank 25.
For this reason, in a motorcycle employing the air cleaner device 12, the intake air is supplied from an air cleaner case 14 having a minimum required amount during normal running, and the oil cleaner case having a large capacity is removed by removing an oil tank 25 during racing. The intake air will be supplied from 14. Also,
Since the screw 19 and the mounting screw 25b are screwed in the same direction, the work of attaching and detaching these screws can be easily performed. In addition, the downstream end of the suction pipe 23 for guiding outside air into the air cleaner case 14 is
Although the suction pipe 23 is attached to the right case 17 despite the structure facing the side of the oil tank 25 inside, the suction pipe 23 is removed by removing the right case 17. As a result, the work of attaching and detaching the oil tank 25 is not interrupted by the suction pipe 23.

In this embodiment, an example is shown in which the air cleaner element 15 is clamped and held by the element holder 15c by the element guide 15a and the tightening bolt 15b.
As shown in FIG. 7 to FIG. 12, the air cleaner element may be held by one element guide.

5 to 7 are views showing another embodiment of the air cleaner element. FIG. 5 is a sectional view showing a state where the air cleaner element is attached to an air cleaner case. FIGS. 6 (a) and 6 (b) show an element guide. 2A is a plan view, and FIG. 1B is a front view. FIG. 7 is a view showing a state where the air cleaner element is held by the element guide, and FIG. 7 is a sectional view taken along the line VII-VII in a state where the element guide in FIG. 6 (a) is bent. In these figures, the same or equivalent members as those described in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description is omitted. In these figures, 31 is an element guide for holding the air cleaner element 15. This element guide 31 is shown in FIGS. 6 (a) and (b).
As shown in the figure, it is formed in a rectangular shape in plan view and has openings on both sides
A holding plate 34 formed with 32, 33, and a cage-like column 35 protruding from the holding plate 34 so as to extend above the opening 32, and a substantially central portion in the longitudinal direction of the holding plate 34 A bent portion 36 having a thickness dimension smaller than that of the other portions is formed in the portion.

To attach the air cleaner element 15 to the air cleaner case 14 using the element guide 31, first, the air cleaner element 15 is put on the support 35. Then, as shown by a two-dot chain line in FIG. 6 (b), the holding plate 34 is bent at the bent portion 36, and the air cleaner element 15 is exposed in the opening 33 so that both ends of the holding plate 34 are connected to each other. Let them face each other. In this state, as shown in FIG. 7, the air cleaner element is
15 is pinched. Thereafter, as shown in FIG. 5, the mounting operation is completed by inserting the holding plate 34 into the guide groove 16b of the air cleaner case 14. At this time, guide groove
By inserting the holding plate 34 into 16b, the holding plate 34 can be prevented from opening. Use of this element guide 31 eliminates the need for bolts and nuts,
The air cleaner element 15 can be easily attached and detached. Further, since the number of parts is reduced, the manufacturing cost can be reduced.

〔The invention's effect〕

As described above, the motorcycle air cleaner device according to the present invention has a box-shaped air cleaner case formed by the main body and the lid so as to be divided into two in the vehicle width direction, and the main body is fixed to the vehicle body frame. The lid is detachably attached to the main body by a screw having a mounting / removing direction of a vehicle width direction, and an air intake duct communicating the air cleaner case and the carburetor is connected to a front wall of the main body of the main body. A bottomed cylindrical air cleaner element is mounted, the intake duct is connected to the air cleaner element, and a suction pipe for guiding outside air into the air cleaner case is attached to the upper wall of the lid, and the downstream end is inserted into the air cleaner case. The oil pipe is located on the upper side of the suction pipe on the upper side in the case behind the air cleaner element and behind the air cleaner element. The oil tank is held by a support piece protruding from the inner wall surface of the main body and an oil tank oil supply portion penetrating through the upper wall of the main body and protruding outside the main body. Since one side in the vehicle width direction facing the body is fixed to the lid with mounting screws that penetrate it, removing the oil tank from the air cleaner case increases the substantial capacity of the air cleaner case by the amount of the oil tank. become. For this reason, in a motorcycle employing this air cleaner device, by removing the oil tank, the intake air is supplied from the air cleaner case having a large capacity, and the responsiveness of the engine to accelerator operation can be improved. Therefore, according to the present invention, a large-capacity air cleaner case can be installed in a limited component mounting space below the seat, and this space can be used effectively. Also, by removing the screw for connecting the lid to the main body of the air cleaner case and the mounting screw for fixing the oil tank to the lid, and removing the lid from the main body, the air cleaner case can be widely opened to the side. become. Since the oil tank is only held by the main body,
This oil tank can be easily taken out from the opening. Since the screws are screwed in the same direction, the screws can be easily attached / detached. In addition, since the downstream end of the suction pipe that guides outside air into the air cleaner case has a structure facing the side of the oil tank in the air cleaner case, the suction pipe is attached to the lid. Since the suction pipe is removed by removing the lid, the suction pipe does not obstruct the attachment / detachment operation of the oil tank.

Therefore, the operation of removing the oil tank in order to reduce the weight during the race can be performed quickly.

[Brief description of the drawings]

FIG. 1 is a side view showing a motorcycle employing a motorcycle air cleaner device according to the present invention, FIG. 2 is an enlarged plan view showing the air cleaner device according to the present invention, and FIG. 3 is III in FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 5 to 7 are views showing another embodiment of the air cleaner element. FIG. 5 is a sectional view showing a state where the air cleaner element is attached to an air cleaner case. FIGS. 6 (a) and 6 (b) show an element guide. 2A is a plan view, and FIG. 1B is a front view. FIG. 7 is a sectional view showing a state where the air cleaner element is held by the element guide. 12 …… Air cleaner device, 14 …… Air cleaner case,
15 …… Air cleaner element, 16 …… Left case, 17…
... right case, 25 ... oil tank.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-301484 (JP, A) JP-A-60-183229 (JP, A) JP-A-1-28393 (JP, U) JP-A 62-183 58280 (JP, U) Actually open 58-44474 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62J 39/00 B62J 31/00 B62M 7/02 F02M 35/16

Claims (1)

(57) [Claims] In a motorcycle air cleaner device disposed behind a vehicle body and below a seat with respect to a two-stroke engine mounted at the center in the vehicle width direction, a box-shaped air cleaner case is constituted by a body and a lid. The main body is fixed to the vehicle body frame, and the lid is detachably attached to the main body with a screw whose mounting / removing direction is a vehicle width direction to connect the air cleaner case and the carburetor. An intake duct is connected to the front wall of the main body of the main body, a bottomed cylindrical air cleaner element is mounted inside the air cleaner case on the wall, the intake duct is connected to the air cleaner element, and outside air is guided into the air cleaner case. A suction pipe is attached to the upper wall of the lid so that the downstream end faces the inside of the air cleaner case, and the downstream end of the suction pipe is An oil tank is arranged on the side and above the inside of the case behind the air cleaner element in the vehicle body. A motorcycle air cleaner characterized in that the oil tank is held by a projecting oil tank oil supply section, and one side of the oil tank facing the lid in the vehicle width direction is fixed to the lid by mounting screws penetrating the lid. apparatus.