JP3697886B2 - Scooter type motorcycle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scooter type motorcycle including a unit swing type engine in which an engine and a power transmission mechanism are housed in an integrated crankcase and transmission case.
[0002]
[Prior art]
In general, a scooter type motorcycle is provided with a unit swing type engine, and this unit swing type engine is swingably supported by a support shaft and a cushion unit provided at a front end portion thereof. It swings with the rear wheel.
Then, above the cylinder of the unit swing type engine, et accession Lina case and carburetor or the like are sequentially serially retained, they are held to swing with the unit swing type engine.
[0003]
[Problems to be solved by the invention]
Incidentally, in the above-described conventional unit swing-type engine, above the unit swing type engine, there are trunk room and sheets for housing a helmet or the like, to avoid interference with the unit swing type engine at the time of swinging There is a need. Therefore, as e Accession Lina case and carburetor of the prior art, if that had been serially held above the unit swing type engine, or flattening the error accession Lena case in the vertical direction, or It is necessary to set the position of the bottom of the trunk room or the like upward. However, when flattened the error accession Lina case, it is impossible to obtain a sufficient capacity et accession Lina case, there is a possibility that lowering the intake performance and, above the level of the bottom portion of the trunk room When the vehicle is moved to the upper side, the height of the seat provided above it also increases, causing a problem that the riding performance and running stability are lowered.
[0004]
The present invention, the above problem of the prior art in which order was made to solve, with good legs arrive is obtained, it is possible to obtain a sufficient capacity et accession Lina, scooter type motorcycle which is excellent in intake performance The purpose is to provide.
[0005]
[Means for Solving the Problems]
The present invention extends a transmission case that houses a power transmission mechanism that transmits the rotational force of the crankshaft to a rear wheel behind a crankcase that houses a crankshaft and the like. A scooter type vehicle of a unit swing type engine provided with a cylinder projecting substantially horizontally toward the front at the front end portion, wherein a carburetor is disposed so as to protrude from a cylinder head of the cylinder into a space in front of the vehicle , While the carburetor and the cylinder head are connected via an intake pipe, an air cleaner is connected to the carburetor via an outlet tube, and a rear portion of the air cleaner is disposed above the cylinder, and an inner portion of the rear portion is connected. the cleaner element is fitted and fixed toward the air cleaner on the downstream side of the cleaner element, cylindrical on the side of the vaporizer The lateral portion protruding forward from the head is provided arranged so as to form a plan view L-shape by the said rear part, connected to the side portion of the air cleaner is protruded to the outlet tube to the vehicle width direction, A scooter type motorcycle in which an intake path from an inlet tube of the air cleaner to an engine through an air cleaner case and an outlet tube is formed in an annular shape in plan view.
[0006]
In the present invention having the above structure, since the lateral portions and the vaporizer constitute a part of the error accession Lina is disposed by utilizing a front space of the cylinder head, the distance between the vaporizer and e Accession Lina and sheet Can be sufficiently secured without increasing the height of the sheet. Therefore, it is possible to maintain with good intake properties to be able to secure sufficient capacity of the error accession Lina is obtained, even legs reach of a good state.
[0007]
Also, if the rear part of the air cleaner case, which forms the outer shell of the air cleaner, is placed under the seat and held in a floating state on the cylinder head via a cushion such as rubber, vibrations of the engine and the like are directly applied. et accession Lina is the the it is possible to prevent the transfer to, it is possible to reduce the generation of noise at d accession Lina, thereby improving the comfort of riding in.
Also, the air cleaner case that forms the outer shell of the air cleaner is provided with an inlet tube that opens forward from the front of the rear portion, and the inlet tube is opened above the intake pipe so that an annular intake path is seen in plan view. Curves spirally.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an external side view showing an overall configuration of a scooter type motorcycle according to an embodiment of the present invention, FIG. 2 is an explanatory side view showing an internal configuration of the motorcycle shown in FIG. 1, and FIG. 3 is shown in FIG. side view of a unit swing type engine and its peripherals, FIG. 4 is a plan view of that shown in FIG. 3, FIG. 5 is a front view to that shown in FIG. 3, a part longitudinal sectional side but 6 are shown in FIG. 4 7 and 7 are partial bottom views of what is shown in FIG.
[0009]
As shown in FIG. 1, a motorcycle 1 in this embodiment is a large two-seater scooter equipped with a four-cycle DOHC engine, and a vehicle body front part 4 having a leg shield 2 and a screen 3 projecting left and right. The handle 6 is held by a frame 20 which will be described later, and the front wheel 8 is rotatably held by a front fork 7 connected to the lower side of the handle 6. A double seat (also referred to as “seat”) 10 having a backrest 9 and the like is held behind the vehicle body front portion 4, and between the vehicle body front portion 4 and the seat 10, A floor portion 14 is constituted by a pair of left and right footrests 11 and 12 with respect to the vehicle traveling direction in which the occupant can place both feet, and a convex portion 13 rising upward between the footrests 11 and 12. Is formed.
[0010]
A rear cover 15 that covers the rear portion of the vehicle body is provided behind the floor portion 14, and a rear wheel 16 is supported by the unit swing type engine 17 so as to be swingable up and down. . In this embodiment, the unit swing type engine is equipped with a 4-cycle engine.
The seat 10 is detachably held on a frame 20 described later, and a trunk room R for storing a helmet or the like is formed below the seat 10.
[0011]
Further, the motorcycle shown in FIG. 1 is provided with a so-called underbone frame 20 as shown in FIG. That is, a head pipe 21 that rotatably supports a steering stem 6a fixed to the handle 6 is provided at the front end of the frame 20, and the head pipe 21 extends obliquely downward toward the rear. An upper down tube 22 and a lower down tube 23 are provided symmetrically with respect to the traveling direction, and a pair of left and right supporting the floor portion 14 and the seat 10 is provided on each of the down tubes 22 and 23. The upper frame 24 is connected to the lower frame 25 that supports the footrests 11 and 12 from below and the rear part rises upward and is connected to the rear end of the upper frame 24 . Further, a seat rail 26 bent in a U shape for supporting the trunk room is fixed to the rear end portion of the lower frame 25. The upper frame 24 and the lower frame 25 are connected to each other by a plurality of bridges 27 so that necessary and sufficient strength can be obtained.
[0012]
A front end portion of the unit swing type engine 17 that rotatably supports the rear wheel 28 is rotatably connected to the lower frame 25 via a pivot 17a and linked to the lower frame 25. It is connected to a cushion unit that is connected via a mechanism 29, and is supported so as to be able to swing together with the rear wheel 28 against the elastic force of the cushion unit 30. The unit swing type engine 17 includes a crankcase 17A that houses a crankshaft (not shown), a transmission case 17B that is integrally formed to extend behind the crankcase 17A, and a front end portion of the crankcase 17A. The outer shell is constituted by the cylinder 17C and the cylinder head 17D protruding from the cylinder 17C. A power transmission mechanism for transmitting the rotational force of the crankshaft to the rear wheel 28 is built in the transmission case 17B.
[0013]
A carburetor 33 is connected to the front end of the cylinder head 17D via an inlet pipe (intake pipe) 32, and the carburetor 33 protrudes into a space ahead of the cylinder head 17D. The vaporizer 33, in plan view, are arranged at a position offset to the right between the pair of left and right upper frame 2 4.
Moreover, the the intake ports formed in front of the carburetor 33, the error accession Lina 35 are connected through the outlet tube 34. This error action Lina 35 is composed its outer shell by e Accession Lina case 36, the error action Lina case 36 includes a rear portion 37 of the wide rectangular plan view in the vehicle left-right direction (width direction), the rear portion 37 is constituted by a lateral portion 38 that communicates with, inward from the opening formed in the upper portion of the rear portion 37, Cree seedlings Remento 39 is fitted and fixed. The rear portion 37 of the ET accession Lina case 36, the is fixed to the upper surface of the cylinder 17C, the lateral portion 38 is located on the side of the evaporator 33 protrudes forward of the cylinder head 17D ing.
[0014]
Also, the rear portion 37 of the error accession Lina case 36 is fixed as follows on the cylinder 17C.
That is, the bottom surface of the d accession Lina case 36, as shown in FIGS. 3, 6, and 7, a plurality (here two) are projecting boss 36A of the boss 36A is of the cylinder 17C It is press-fitted into a rubber cushion fixed on the top surface. Further, the bottom surface of the d accession Lina casing 36 is fixed a rubber cushion material 41, which is fixed by screws 42 to the cylinder head 17 D. Accordingly, et accession Lina case 36 in this embodiment is adapted to hold the d Accession Lena 35 floating state by a rubber cushion which is press-fitted in the boss 36 A and the cushion member 41.
[0015]
An outlet tube 34 is connected to a side portion 38 of the air cleaner case 36. The outlet tube 34 is bent in a substantially L shape so as to protrude rearward from the right side surface of the side portion 38 to the right in the vehicle width direction .
The rear end of the outlet tube 34 is connected to an opening 33 a formed at the front end of the vaporizer 33.
Further, a cap 36B is detachably attached to the edge of the opening 36a formed in the rear part of the air cleaner case 36, and closes the opening 36a when fitted. It has become. However, an air cleaner inlet tube 36B1 is connected to the front portion of the cap 36B, from which external air can be introduced into the air cleaner 35.
The vaporizer 33 is connected to a fuel tank (not shown).
[0016]
In the motorcycle intake device of this embodiment configured as described above, the fresh air introduced from the inlet tube 36B1 passes through an annular intake path in plan view as shown in FIG. The swing type engine 17 is reached.
That is, fresh air flows into the air cleaner case 36 from the air cleaner inlet tube 36B1 that opens forward above the inlet pipe 32, and dust contained in the fresh air is removed by the cleaner element 39. Thereafter, the air supplied to the downstream side of the air cleaner case 36 and further supplied to the downstream side is sent to the carburetor 33 through the outlet tube 34, where gasoline or the like supplied from a fuel tank (not shown) is supplied. It is mixed with fuel, and the mixture is supplied to the engine to drive the engine.
[0017]
Thus, in this embodiment, since the error accession Lina case 36 is constituted by the rear portion 37 and the side portion 38, along with the e Accession Lina 35 can provide sufficient capacity, cleaner element 39 because it is disposed in an opening 3 6 a wide picture accession Lina case 36, it is possible to obtain a large filtration area, obtain a very good air supply state.
[0018]
Moreover, et accession Lina case 36, since the side portions is a part is disposed by effectively utilizing the dead space becomes below the seat 10 in front of the cylinder head 17 D, et accession Lina Case 36 In addition, the position of the vaporizer 33 can be set downward, and even if a sufficient space is set between the seat 10 and the bottom portion R1 of the trunk room R, the position of the seat 10 does not need to be significantly increased. Therefore, even if the swing unit swing type engine 17 is vertically, vaporizer 33, and et accession Lina 35, etc. is not interfere with the bottom portion R1 of the seat 10 and the trunk room R, such as when traveling on a rough road In this case, the vehicle 1 is not damaged.
[0019]
Further, with respect to the cylinder head 17 D, since the air cleaner case 36 is held in a floating state by the cushion member 41 in the manner described above, et accession Lina 35 in a state where vibration is relaxation of the unit swing type engine 17 and carburetor 33 is transmitted, it is possible to prevent such occurrence and breakage of unpleasant vibration sound et accession Lina 35 and the vaporizer 33 occurs, it is possible to obtain a good ride properties.
Further, since the cap 36B of the air cleaner case 36 in this embodiment is disposed below the detachable seat 10, when performing the cleaning operation of the cleaner element 39, the seat 10 is removed and the cap 36B is removed. Thus, the cleaner element 39 can be easily attached and detached, and the cleaning operation can be easily performed.
[0020]
Further, inlet tube 36B 1 of d accession Lina 35 protrudes toward the front of the d accession Lina 35 forward, since the opening and splashed dust and muddy water by the rear wheel 28, et accession Lina 35 the blocking by the rear portion 37, being sucked into the opening of the inlet tube 36B 1 is prevented. Therefore, the contamination of the cleaner element 39 can be suppressed.
[0021]
Incidentally, in the above embodiment, the front portion space of the cylinder 17C, the carburetor 33 arranged to be biased to the right side of the vehicle, a lateral portion 38 constituting a part of the error accession Lina case 36 of the vehicle While the case of arranging the left side portion is described taking as an example, the vaporizer 33 to the left side of the vehicle, it is also possible to arrange the lateral portions 38 of the eT accession Lina case 3 6 on the right.
[0022]
【The invention's effect】
As the present invention as described above, by disposing the vaporizer to the vehicle in front of the cylinder of the cylinder head, carburetor and while the cylinder head is connected through an intake pipe, the error accession Lina forming a planar view L-shape with placing the rear part above the cylinder, due to the provision of the side portion protruding forward from the cylinder head on the side of the carburetor, large capacitance tomoe accession Lina without increasing the height of such sheet or trunk room Can be obtained, and good air intake performance and foot-holding performance can be obtained.
Further, if to attach et accession Lena the cylinder in a floating state, it is possible to alleviate the vibration generated in the unit swing type engine is directly transmitted to the e accession Lina, noise etc. et accession Lina Etc. can be prevented.
[Brief description of the drawings]
FIG. 1 is an external side view showing an overall configuration of a scooter type motorcycle according to an embodiment of the present invention.
Fig. 2 is an explanatory side view showing an internal configuration of the motorcycle shown in Fig. 1;
FIG. 3 is a side view showing the unit swing type engine shown in FIG. 1 and its peripheral configuration.
4 is a plan view of what is shown in FIG. 3. FIG.
FIG. 5 is a front view of what is shown in FIG. 3;
6 is a partially longitudinal side view of what is shown in FIG. 4. FIG.
7 is a partial bottom view of what is shown in FIG. 6. FIG.
[Explanation of symbols]
R crankcase 1 motorcycle 17B transmission case 17C cylinder 17D cylinder head 17 unit swing type engine 32 inlet pipe (intake pipe)
33 vaporizer 34 outlet tube 35 d Aku Lina
36 air cleaner case 37 side portion of the rear portion 38 an air cleaner of an air cleaner
39 Cleaner element 41 Cushion material

Claims (3)

A transmission case that houses a power transmission mechanism that transmits the rotational force of the crankshaft to the rear wheel is extended behind the crankcase that houses the crankshaft and the like, and the front end of the crankcase is A unit swing type engine scooter type vehicle having a cylinder projecting substantially horizontally toward
A carburetor is disposed so as to protrude from the cylinder head of the cylinder into a space in front of the vehicle , and the carburetor and the cylinder head are connected via an intake pipe,
An air cleaner is connected to the vaporizer via an outlet tube;
The rear portion of the air cleaner while arranged above the cylinder, the cleaner element is fitted and fixed inwardly of its rear portion,
An air cleaner which is downstream of the cleaner element is disposed so as to form a L-shape in plan view with the rear portion by providing a side portion protruding forward from the cylinder head on the side of the vaporizer ,
The outlet tube is protruded in the vehicle width direction and connected to the side portion of the air cleaner,
A scooter type motorcycle, wherein an intake path from an inlet tube of the air cleaner to an engine through an air cleaner case and an outlet tube is formed in an annular shape in plan view. 2. The scooter type automatic according to claim 1, wherein a rear portion of an air cleaner case forming an outer shell of the air cleaner is disposed below the seat and is floated on a cylinder head via a cushion such as rubber. Motorcycle. The air cleaner case, which forms the outer shell of the air cleaner, is provided with an inlet tube that opens forward from the front of the rear part. The scooter type motorcycle according to claim 1 or 2, wherein the scooter type motorcycle is curved.

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