JP2010058749A - Saddle-riding type four-wheel vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a saddle-riding type four-wheel vehicle capable of being simplified in constitution, while securing volume of a breather device without hindering attaching/detaching property of an air cleaner by utilizing a dead space. <P>SOLUTION: At least a part of a portion located on a rear side of an engine 5 of a vehicle body frame 2 includes right rear frame 12a and left rear frame 12a. At least a part of the air cleaner 20 is arranged between the right rear frame 12a and the left rear frame 12a, and is provided to be attachable/detachable to/from the vehicle body frame 2 in the vertical direction. The breather device 23 is attachably/detachably provided in one of a left sidewall 21g of the air cleaner 20 or a right sidewall 21h on a lower side of the right rear frame 12a or the left rear frame 12a and on an upper side of a power transmission mechanism 17, and includes a volume chamber 24 connected to the engine 5 and the air cleaner 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a straddle-type four-wheel vehicle for traveling on rough terrain, for example, and more particularly to an improvement in the arrangement structure of a breather device.

  In a four-cycle engine mounted on a saddle-ride type four-wheel vehicle or the like, a part of the combustion gas leaks into the crankcase through between the cylinder bore and the piston ring. In order to avoid power loss due to pressure fluctuations in the crankcase of the leaked gas (blow-by gas), this type of vehicle separates and recovers the oil content in the blow-by gas and also removes the air from which the oil content has been separated. It has a breather device that returns it to the intake system.

As a vehicle body mounting structure of this type of breather device, an oil tank and an oil catch tank of a breather device are arranged between a radiator and an engine in a side view of the vehicle (Patent Document 1). There is one that is provided independently between the engine intake system and the exhaust system above the crankcase (see Patent Document 2).
JP 2007-191105 A JP 2004-60531 A

  In the case of Patent Document 1, since the oil catch tank is arranged immediately after the radiator, there is a problem that when the radiator is enlarged to ensure the cooling performance of the radiator, the volume of the oil catch tank of the breather device cannot be sufficiently secured. is there.

  There is also a problem that the structure for supporting the oil catch tank on the vehicle body frame is complicated.

  Further, in the case of Patent Document 2, since the structure uses an intricate dead space between the intake system and the exhaust system, the support structure for the body frame of the breather tank is complicated and the volume is difficult to secure. There is.

  The present invention has been made in view of the above-described conventional situation, and is a straddle type capable of simplifying the configuration while securing the volume of the breather device without impairing the detachability of the air cleaner by utilizing the dead space. The problem is to provide a four-wheeled vehicle.

  The present invention includes a vehicle body frame extending in the front-rear direction of a vehicle, an engine supported by the vehicle body frame, an intake passage extending rearward from the engine, an air cleaner connected to a rear end portion of the intake passage, and the engine A pair of rear wheels swingably supported by the vehicle body frame and outside the vehicle body frame in the vehicle width direction, a power transmission mechanism for transmitting the engine power to the rear wheel, A breather device for separating and collecting the oil content of blow-by gas, and at least a part of a portion of the vehicle body frame located behind the engine includes a right rear frame and a left rear frame, and the air cleaner includes: At least a part of the frame is disposed between the right rear frame and the left rear frame and is detachable in the vertical direction with respect to the body frame. The breather device is detachably provided on one of a left side wall or a right side wall of the air cleaner that is positioned below the right rear frame or the left rear frame and above the power transmission mechanism. A straddle-type four-wheel vehicle including a volume chamber connected to an air cleaner.

  According to the straddle-type four-wheel vehicle according to the present invention, the air cleaner is positioned at least partially between the right rear frame and the left rear frame, and the volume chamber of the breather device is disposed in the air cleaner. It was detachably provided on one of the left side wall and the right side wall located below the right rear frame or the left rear frame and above the power transmission mechanism. Therefore, the volume chamber of the breather device can be arranged using a dead space defined by the air cleaner, the vehicle body frame, the power transmission mechanism, and the rear wheel.

  In addition, since the air cleaner is detachable in the vertical direction with respect to the vehicle body frame, the left and right side walls are relatively large flat surfaces, and it is easy to secure a space for providing the volume chamber.

  Furthermore, since the volume chamber is directly attached to the side wall of the air cleaner, the structure for attaching the volume chamber can be simplified.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 12 are views for explaining a saddle riding type four-wheel vehicle for rough terrain travel according to an embodiment of the present invention. In the present embodiment, front and rear and left and right mean front and rear and left and right when viewed in a seated state.

  In the figure, reference numeral 1 denotes a straddle-type four-wheel vehicle for traveling on rough terrain. This straddle-type four-wheel vehicle 1 includes a left and right front wheels 3 and 3 supported on the left and right outer sides of the body frame 2, and a left and right outer wheels arranged on the left and right, Right rear wheels 4, 4, an engine 5 mounted at the center of the body frame 2, a fuel tank 6 mounted above the engine 5, and a seat 7 mounted behind the fuel tank 6, Have In addition, 3a is a front fender that covers the upper side of the front wheel 3, and 4a is a rear fender that covers the upper side of the rear wheel 4.

  The vehicle body frame 2 includes an upper frame 8, a lower frame 9, a front frame 10 that joins the front portions of the upper and lower frames 8, 9, a rear frame 11 that joins the rear portions, and the rear frame 11. And a seat frame 12 extending rearward of the vehicle.

  The upper frame 8 is fixed to the left and right side surfaces of the upper end portion of the front frame 10 and extends rearward of the vehicle. The left and right tank rails 8a are fixed to the left and right side surfaces of the upper end portion of the rear frame 11. , 8a.

  The lower frame 9 is fixed to the left and right sides of the lower end portion of the front frame 10 and extends to the rear of the vehicle. The left and right under rails 9a are fixed to the left and right sides of the lower end portion of the rear frame 11. 9a.

  The engine 5 is mounted in a cradle surrounded by the upper frame 8, the lower frame 9, the front frame 10 and the rear frame 11. A steering shaft 13 is attached to the center of the front frame 10 in the vehicle width direction. A steering handle 14 is fixed to the upper end portion of the steering shaft 13, and the lower end portion of the steering shaft 13 is connected to the left and right front wheels 3, 3 via a steering tie rod. The front wheels 3 and 3 are supported at the front ends of front arms (not shown) supported by the front portions 9b of the under rails 9a and 9a so as to be swingable up and down.

  Further, when viewed from the rear of the vehicle, the rear frame 11 is formed by connecting the upper ends of the left vertical side portion 11a and the right vertical side portion 11a and the lower ends thereof with an upper horizontal side portion 11b and a lower horizontal side portion 11b. It has a shape.

  A rear arm 15 is pivotally supported by a lower part of the left and right vertical sides 11a, 11a via a pivot shaft 15c so as to be swingable up and down. The rear arm 15 has a pair of left and right arm bodies 15a and 15a extending rearward from the pivot point, and a shaft support portion 15b connected to the rear ends of both arm bodies. The axle 16 is rotatably supported. The rear wheel 4 is fixed to the front end portion of the rear axle 16.

  The seat frame 12 is located behind the engine 5 and is connected to the upper left and right sides of the rear frame 11 and extends rearward, and the left and right seat frame bodies 12a and 12a, and the seat frame body 12a, 12a has a cross part 12b that integrally connects the rear end parts and a cross member 12c that connects the front parts, and has a substantially rectangular shape in plan view. A flange portion 12d is integrally formed on the upper edge of the seat frame main body 12a. The flange portion 12d is bent inward in the vehicle width direction from the upper edge and further bent downward, and has a seven-character shape as a whole.

  Here, the seat frame 12 corresponds to “at least a part of a portion of the vehicle body frame located behind the engine” in the present invention, and the left seat frame main body 12a corresponds to the “left rear frame” of the present invention. The right seat frame body 12a corresponds to the “right rear frame” of the present invention.

  The saddle-ride type four-wheel vehicle 1 includes a power transmission mechanism 17 that transmits the power of the engine 5 to the rear axle 16. The power transmission mechanism 17 has a structure in which a drive chain 17c is wound around a drive sprocket 17a fixed to the left end of the output shaft 5e of the engine 5 and a driven sprocket 17b fixed to the rear axle 16. is there. The power transmission mechanism 17 is disposed so as to substantially overlap the left seat frame main body 12a when viewed from above the vehicle.

  The engine 5 has a schematic structure in which a cylinder body 5b and a cylinder head 5c are stacked and coupled to a front portion of an upper surface of a crankcase 5a that houses a crankshaft and a speed change mechanism, and a head cover 5d is attached to an upper surface opening of the cylinder head 5c. Have

  An intake device 18 is connected to the rear wall of the cylinder head 5c, and the intake device 18 extends rearward through the rear frame 11. The intake device 18 includes an intake passage 19 connected to the rear wall of the cylinder head 5 c and an air cleaner 20 connected to the rear end portion of the intake passage 19. The intake passage 19 includes a throttle body 19a connected to the rear wall, and an intake duct 19b connecting the throttle body 19a and the air cleaner 20. The throttle body 19a has a built-in throttle valve and a fuel injection valve 19d.

  The air cleaner 20 is disposed such that the upper portion thereof is positioned between the left and right seat frame bodies 12a and 12a, and most of the air cleaner 20 is located below the seat frame body 12a. It protrudes slightly above the seat frame body 12a.

  The air cleaner 20 includes a substantially rectangular parallelepiped box-like cleaner case 21 and a bottomed cylindrical element 22. The cleaner case 21 has a substantially rectangular parallelepiped box-shaped main body 21a and a lid member 21b that can open and close the opening 21c. Reference numeral 21d denotes an air suction port.

The element 22 includes a cylindrical element main body 22a and a support member 22b. The element main body 22a and the support member 22b are fixed to the main body portion 21a by a bolt 22d via a base member 22c and unitized. ing. Further, the upstream end portion of the intake duct 19b is fitted and connected to the front end portion 22e of the base member 22c, and is fixed by a fixing band 19c.
A mounting flange portion 21e is formed on the outer surface near the upper end opening of the main body portion 21a. The mounting flange portion 21e is placed on the flange portion 12d of the seat frame main body 12a and fixed with bolts 21f. ing. That is, the air cleaner 20 can be attached to and detached from the seat frame 12 by removing the bolt 21f.

  When the air cleaner 20 is detachable, the left side wall 21g and the right side wall 21h of the main body 21a of the cleaner case 21 are formed on a relatively wide flat surface. This increases the volume of the air cleaner while avoiding interference with the seat frame body 12a when the air cleaner 20 is attached and detached in the vertical direction.

  Furthermore, the four-wheel vehicle 1 of this embodiment includes a breather device 23 that separates and collects the oil content of the blow-by gas of the engine 5. The breather device 23 has a volume chamber 24 for separating the oil content in the blow-by gas, an introduction hose 25 a for introducing blow-by gas from the engine 5 into the volume chamber 24, and returning the separated oil content to the engine 5. Hose 25b.

  The volume chamber 24 is detachably attached to the left side wall 21 g of the air cleaner 20 with a bolt 26. Most of the left side wall 21g is located below the left seat frame main body 12a, above the power transmission mechanism 17, and further above the crankcase 5a of the engine 5. That is, the volume chamber 24 is disposed in a space A surrounded by the left seat frame main body 12a, the air cleaner 20, the power transmission mechanism 17, and the rear wheel 4 when viewed from the rear of the vehicle.

  A part a of the volume chamber 24 is located outward of the seat frame main body 12a in the vehicle width direction, and when viewed from the side of the vehicle, one of the parts a of the volume chamber 24 is included. The part b overlaps with the seat frame main body 12a.

  The volume chamber 24 has a main body portion 24a located on the air cleaner 20 side, and a lid portion 24b located on the outer side in the vehicle width direction and welded to the opening 24c portion of the main body portion 24a.

  The main body 24a is formed with a gas inlet 24e for introducing blow-by gas, a drain outlet 24f for discharging the separated oil, and an exhaust 24g for returning the air from which the oil has been separated to the air cleaner 20. .

  A large number of partition walls 24h are formed on the inner surfaces of the main body portion 24a and the lid portion 24b to allow blow-by gas to flow in a zigzag manner. The whole volume chamber 24 functions as a gas-liquid separation chamber for separating the gas and the oil in the blow-by gas, and the volume necessary for the breather device 23 is secured only by the volume chamber 24. .

  Note that the gas-liquid separation chamber may be provided not only in the volume chamber 24 but also dispersed in the air cleaner or the engine. In this way, the volume of the volume chamber can be increased without increasing the size of the entire apparatus.

  One end 25c of the introduction hose 25a is connected to the gas introduction port 24e, and one end 25d of the return hose 25b is connected to the drainage port 24f. The introduction hose 25a and the return hose 25b extend to the engine 5 side through the inside of the left vertical side portion 11a of the rear frame 11, and the other end 25e of the return hose 25b communicates with the crankcase 5a. Connected to the top of this. The other end 25f of the introduction hose 25a is connected to the upper surface thereof so as to communicate with the head cover 5d.

  Here, the upper surface of the crankcase 5 a to which the other end 25 e of the return hose 25 b is connected is located below the bottom of the volume chamber 24. The return hose 25b is inclined so that the other end 25e side is lowered, and the other end 25e is located at the lowest position in all paths.

  The exhaust port 24g is inserted into a grommet 21i attached to the air cleaner 20 when the volume chamber 24 is attached to the air cleaner 20. The grommet 21 i is pressed against the element body 22 a, so that the air separated from the exhaust port 24 g enters the secondary side of the air cleaner 20 and is sucked into the engine 5 through the intake passage 19. Is done.

  Furthermore, an exhaust device 27 is connected to the front wall of the cylinder head 5 c of the engine 5. The exhaust device 27 has an exhaust pipe 27a connected to the front wall of the cylinder head 5c, and a muffler 27b connected to the rear end of the exhaust pipe 27a.

  The exhaust pipe 27a extends rearward from the front wall through the right in the vicinity of the boundary between the cylinder head 5c and the cylinder body 5b, and the exhaust pipe 27a and the muffler 27b are connected to the right wall 21h of the air cleaner 20. That is, it extends rearwardly through the outside of the volume chamber 24 on the opposite side. When viewed from the side of the vehicle, a portion of the volume chamber 24 overlaps the muffler 27b.

  As described above, according to the present embodiment, at least part of the air cleaner 20 is positioned between the left and right seat frame bodies 12a and 12a, and the volume chamber 24 of the breather device 23 is The air cleaner 20 is detachably provided on the left side wall 21g located below the left seat frame main body 12a and above the power transmission mechanism 17 and above the crankcase 5a. Accordingly, the volume chamber 24 of the breather device 23 can be arranged using the space A defined by the air cleaner 20, the seat frame body 12 a, the power transmission mechanism 17, the crankcase 5 a and the rear wheel 4.

  Further, since the volume chamber 24 is disposed at a higher position than the crankcase 5a and the return hose 25b is inclined so that the crankcase side is lowered, the oil component separated from the blow-by gas can be reliably returned to the crankcase. it can.

  Further, since the air cleaner 20 is detachable in the vertical direction with respect to the seat frame main body 12a, the left side wall 21g has a relatively large flat surface, and it is easy to secure a space for providing the volume chamber 24. Further, the volume chamber 24 can be attached to the air cleaner 20 with the bolt 26 directly.

  Further, since the exhaust pipe 27a and the muffler 27b of the exhaust device 27 are arranged so as to extend rearward through the opposite side of the left side wall 21g of the air cleaner 20, that is, the opposite side of the volume chamber 24, the volume chamber 24 is made of exhaust gas. You can avoid heat damage. Further, since there is no heat damage, the shape of the volume chamber 24 can be freely set and the volume can be increased.

  Further, at least a part of the volume chamber 24 is formed so as to be positioned outward in the vehicle width direction from the left seat frame main body 12a, and a part thereof is further seen from the side of the vehicle when viewed from the side of the vehicle. The volume of the volume chamber 24 can be increased.

  Since the entire volume chamber 24 is configured to function as a gas-liquid separation chamber, the volume that fulfills the gas-liquid separation function can be increased, and the oil content of blow-by gas can be reliably separated.

  In the above embodiment, only the volume chamber 24 has the gas-liquid separation function. However, another gas-liquid separation chamber can be provided in the air cleaner 20 or in the engine. One air-liquid separation chamber may be configured with the air cleaner 20. When the gas-liquid separation chambers are provided in a dispersed manner, it is possible to secure a sufficient volume of the gas-liquid separation chamber while suppressing an increase in the size of each part.

  In the above embodiment, the case where the power transmission mechanism is a chain drive type has been described. However, the power transmission mechanism of the present invention may be other than the chain drive type, for example, a shaft drive type.

1 is a left side view of a saddle riding type four-wheel vehicle for traveling on rough terrain according to an embodiment of the present invention. It is a rear view of the four-wheeled vehicle. It is a top view of the body frame of the four-wheeled vehicle. It is a left view of the said body frame. It is a left view of the intake device of the four-wheeled vehicle. It is a cross-sectional top view of the said intake device. FIG. 7 is a sectional rear view of the intake device (sectional view taken along line VII-VII in FIG. 6). It is a perspective view of the volume chamber of the breather device of the four-wheeled vehicle. It is a perspective view of the main-body part of the said volume chamber. It is a perspective view of the cover part of the said volume chamber. It is a perspective view of the breather device. It is a right view which shows the arrangement | positioning relationship between the exhaust apparatus of the said four-wheeled vehicle, and a volume chamber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Saddle-type four-wheel vehicle 2 Body frame 3 Front wheel 4 Rear wheel 5 Engine 5a Crankcase 5b Cylinder body 5c Cylinder head 12 Seat frame (at least one part of the body frame located behind the engine)
12a Seat frame body (left rear frame)
17 Power transmission mechanism 19 Intake passage 20 Air cleaner 23 Breather device 24 Volume chamber 27 Exhaust device A Space

Claims (7)

A body frame extending in the longitudinal direction of the vehicle;
An engine supported by the body frame;
An intake passage extending rearward from the engine;
An air cleaner connected to the rear end of the intake passage;
A pair of rear wheels swingably supported by the body frame at the rear of the engine and outside the body frame in the vehicle width direction;
A power transmission mechanism that transmits the power of the engine to the rear wheel;
A breather device for separating and collecting the oil content of the engine blow-by gas;
At least a part of a portion of the vehicle body frame located behind the engine includes a right rear frame and a left rear frame,
At least a part of the air cleaner is disposed between the right rear frame and the left rear frame, and is detachably provided in the vertical direction with respect to the vehicle body frame.
The breather device is detachably provided on one of a left side wall or a right side wall of the air cleaner that is positioned below the right rear frame or the left rear frame and above the power transmission mechanism, and is attached to the engine and the air cleaner. A straddle-type four-wheeled vehicle including a volume chamber connected thereto. The straddle-type four-wheel vehicle according to claim 1,
A volume chamber of the breather device is one of a left side wall or a right side wall of the air cleaner that is located below the right rear frame or the left rear frame and above the power transmission mechanism and further above the crankcase of the engine. A straddle-type four-wheeled vehicle that is detachably provided on the vehicle. The straddle-type four-wheel vehicle according to claim 1,
A straddle-type four-wheel vehicle, further comprising an exhaust device that extends rearward from the engine through an outer side in the other vehicle width direction of the left side wall or the right side wall of the air cleaner. The straddle-type four-wheel vehicle according to claim 1,
A straddle-type four-wheel vehicle, wherein at least a part of the volume chamber is formed outward in the vehicle width direction from the right rear frame or the left rear frame. The saddle riding type four-wheel vehicle according to claim 4,
At least a part of the volume chamber is formed at a position overlapping the right rear frame or the left rear frame in a side view of the vehicle. The straddle-type four-wheel vehicle according to claim 1,
The straddle-type four-wheel vehicle, wherein the volume chamber is a part or all of a gas-liquid separation chamber that separates an oil component of blow-by gas of the engine. The straddle-type four-wheel vehicle according to claim 1,
A straddle-type four-wheel vehicle characterized in that an exhaust port for discharging air from which oil has been separated is directly connected to the air cleaner.

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