CN112455581A

CN112455581A - Straddle type all-terrain vehicle

Info

Publication number: CN112455581A
Application number: CN202011174458.0A
Authority: CN
Inventors: 李前进; 陈志勇; 何安; 方颖
Original assignee: Zhejiang CFMOTO Power Co Ltd
Current assignee: Zhejiang CFMOTO Power Co Ltd
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2021-03-09

Abstract

A straddle-type all terrain vehicle, a frame; an engine disposed on the frame, the engine including but not limited to: a cylinder and a cylinder head, the cylinder and the cylinder head constituting a cylinder head of the engine; wherein the cylinder head faces the rear end of the frame and is located below the vehicle saddle system. According to the invention, the cylinder head which is used for heating the engine and the exhaust pipe connected with the cylinder head are arranged in a backward mode, so that the situation that two legs are attached to the vehicle when a user rides on the vehicle is avoided, and the influence of heat emitted by the cylinder head on the use experience of a rider is reduced.

Description

Straddle type all-terrain vehicle

Technical Field

The present invention relates to a straddle type all terrain vehicle.

Background

The background art is for the purpose of facilitating understanding of the technical contents of the present invention and is not prior art.

The All-Terrain Vehicle is English (suitable for All-Terrain vehicles), abbreviated as ATV (advanced technology Vehicle), commonly known as a dune buggy and also known as an All-Terrain four-wheel cross-country locomotive, and has the advantages of simple and practical Vehicle and good cross-country performance. The wide tires of the ATV increase the contact area with the ground, generate greater friction and reduce the pressure of the vehicle against the ground, making it easy to travel on sand beach, riverbed, forest track, stream and bad desert terrain.

It is difficult for an atv to express its meaning by a simple chinese name. According to the appearance of the all-terrain four-wheel off-road vehicle, the all-terrain four-wheel off-road vehicle can be translated, but the all-terrain four-wheel off-road vehicle still feels very stubborn. On soft sand, the wide tire of the ATV can increase the contact area with the ground, thereby generating larger friction force, and the tire is not easy to idle and slip by matching with unique tire threads, so that the tire can easily run on the sand. The ATV can carry people or transport goods to fully play the function of the ATV, which is called a full-function moving tool.

Atvs are generally classified according to the magnitude of the displacement and in combination with the external features of the vehicle:

practical (Utility) is just like jeep (taiwan area calls it as "jeep"), and the biggest characteristic is that it has multiple functions and strong practicality, can carry goods, farmland farming, hunting, etc. by adding the front and back supporter.

Sports type (Sport), the streamline shape has great motion, is suitable for high speed, leap, special technique, and the like, and is mainly used for the types of foreign all terrain vehicles.

Military type: the vehicle can run on any terrain, and is characterized in that the vehicle can freely run on the terrain which is difficult to maneuver by a common vehicle. The all-terrain vehicles are classified according to the walking mode and have two types, namely wheeled type and crawler type. The military potential of all-terrain vehicles is known by more and more military forces, and the development of all-terrain vehicles is prosperous, so that the all-terrain vehicles are not only huge in family, but also various in model and novel in modeling.

At present, all-terrain vehicles are more popular among consumers, wherein a straddle-type all-terrain vehicle is one of the all-terrain vehicles, and the engines adopted by the all-terrain vehicles are generally single-cylinder engines. Most of the existing engine arrangement modes of straddle type all-terrain vehicles are that the cylinder head of the engine is arranged close to the front part. This kind of arrangement results in blast pipe and tubular muffler to need run through whole vehicle to make to straddle the position that is close to driver's health on the vehicle, especially the position temperature that is close to the shank can be higher, thereby has reduced driver's the experience of driving.

In summary, the problem of how to improve the driving experience of the driver for the straddle type all-terrain vehicle has become a technical problem to be solved urgently by those skilled in the art.

Content of application

The invention aims to provide a straddle type all-terrain vehicle so as to improve the driving experience of a driver on the straddle type all-terrain vehicle.

In order to achieve the purpose, the invention adopts the following technical scheme: a straddle type all terrain vehicle comprising: a frame; the wheel assembly comprises a front wheel and a rear wheel which are arranged below the frame; the engine is arranged on the frame and used for providing power for the whole vehicle, and comprises an engine main body and a cylinder head which is connected with the engine main body and is positioned above the engine main body; an intake and exhaust system including an intake assembly for providing air to the engine and an exhaust assembly for exhausting exhaust gas produced by the engine; a brake system associated with the wheel assembly including a parking assembly and a brake assembly; a steering system associated with the wheel assembly for controlling rotation of the wheel assembly; a suspension system associated with the wheel assembly for providing shock absorption to the wheel assembly; the electric system is arranged on the frame and used for providing electric power for ignition of the engine; the transmission system is arranged on the frame and is used for transmitting the power of the engine to the wheel assembly; the fuel system is arranged at the front end of the frame and used for supplying fuel to the engine; a saddle supported on the frame and positioned above the engine; wherein the cylinder head is directed towards the rear end of the frame; the projection of the cylinder head on the same plane where the side walls of the front wheel and the rear wheel on the same side of the vehicle are located is located on one side of the rear of the projection of the midpoint of the circle center connecting line of the front wheel and the rear wheel of the vehicle on the plane, and the cylinder head is close to the rear end of the vehicle frame.

Optionally, the vehicle center line is arranged along the length direction of the vehicle, and on the same plane where a circle center connecting line of two front wheels and a circle center connecting line of two rear wheels of the vehicle are located, the projection of the cylinder head on the plane is offset above the projection of the vehicle center line on the plane.

Optionally, the cylinder head faces the rear end of the frame, the horizontal distance between the cylinder head and the front axle of the vehicle is Le, the horizontal distance between the cylinder head and the rear axle of the vehicle is Lf, and Le is greater than or equal to 2 Lf.

Optionally, the projection of the center of gravity point of the vehicle on the same plane where the side walls of the front and rear wheels on the same side of the vehicle are located is located on the front side of the projection of the center of gravity point of the engine on the plane.

Optionally, the fuel system comprises: an oil tank; the oil tank is arranged at the front end of the frame; the projection of the central point of the oil tank to the same plane where the side walls of the front wheel and the rear wheel are located is positioned below the projection of the highest point of the cylinder head on the plane.

Optionally, the air intake assembly comprises: an air filter; the air inlet pipe is connected with the air filter and is used for allowing air to enter the air filter; the air outlet pipe is matched with the air filter so that filtered air can enter the cylinder head; the air filter is positioned above the oil tank.

Optionally, the exhaust assembly comprises: the tubular muffler is arranged on the frame, and a catalyst for catalyzing the oxidation of waste gas is arranged in the tubular muffler; the exhaust pipe is arranged between the tubular muffler and the cylinder head, one end of the exhaust pipe is connected with the cylinder head, and the other end of the exhaust pipe is connected with the middle part of the tubular muffler; the tubular muffler is provided with: a resonant cavity; an exhaust chamber; the air inlet cavity is arranged between the resonant cavity and the exhaust cavity; the exhaust pipe is communicated with the air inlet cavity; the waste gas enters the resonant cavity from the gas inlet cavity and then flows into the gas outlet cavity through the pipeline; a plurality of resonance tubes are arranged in the resonance cavity, and resonance holes for allowing exhaust gas to enter the resonance cavity are formed in the side walls of the resonance tubes; the part of the pipeline, which is positioned in the resonant cavity, is provided with a plurality of air holes for waste gas to enter the pipeline; the tubular muffler is provided with a partial pressure cavity adjacent to the resonant cavity, one end of the pipeline is positioned in the partial pressure cavity, and waste gas enters the pipeline from the pipeline port.

Optionally, the engine further comprises: a transmission provided on one side of the engine main body; the straddle type all terrain vehicle further comprises a battery; the frame is provided with a battery mounting position, and the battery mounting position is arranged on one side far away from the transmission; the battery mounting position is a battery support plate arranged at the front lower part of the frame.

Optionally, an engine mounting position for supporting the engine is arranged on the frame, a shock absorber obliquely arranged is arranged at the bottom of the engine main body, and the shock absorber is connected with the engine mounting position to form an inverted V-shaped support for the engine.

Optionally, the engine mounting position is a bottom plate arranged at the lower part of the frame, and the bottom plate is provided with at least one plane.

Optionally, one side of the engine main body, on which the cylinder head is disposed, is close to the rear end of the frame, and a connection port for connecting an exhaust pipe on the cylinder head faces the rear end of the frame.

Optionally, the pipe silencer comprises an air inlet and an air outlet, and the air inlet is arranged in the middle of the circumferential wall of the pipe silencer; the air outlet is arranged at the rear lower end of the circumferential wall of the tubular muffler.

Optionally, the tubular muffler includes a tubular body, the middle part of the tubular body is provided with an air inlet chamber directly communicated with the air inlet, a front silencing chamber located at the front end of the air inlet chamber, and a rear silencing chamber located at the rear end of the air inlet chamber, the air inlet chamber is communicated with the front silencing chamber, the front silencing chamber is communicated with the rear silencing chamber through a connecting pipeline, and the air outlet is communicated with the rear silencing chamber.

Optionally, the front silencing chamber and the rear silencing chamber are both provided with porous suction structures inside.

Optionally, a damper connected to the bottom plate is disposed at the bottom of the engine main body, and a bottom surface of the damper is at a preset inclination angle on the engine main body; the preset inclination angle is 15-45 DEG

In conclusion, this engine arrangement structure is through arranging the cylinder head in the engine and being close to the one side of the rear end of frame to the connector that corresponds and be connected with the blast pipe on the cylinder head arranges towards the rear end of frame, thereby makes blast pipe and tubular muffler structure need not run through whole vehicle, and the driver's that is located the frame middle part straddles the position and does not have the blast pipe to pass through, thereby makes the driver's the temperature of straddling the position obviously reduce, has promoted driver's experience of driving.

Drawings

FIG. 1 is a perspective view of a straddle ATV in an embodiment of the present invention.

Fig. 2 is a right side view of the mid-span straddle atv of fig. 1.

Fig. 3 is a right side view of the engine and exhaust assembly of the straddle atv of fig. 1 on the frame.

Fig. 4 is a plan view of the cylinder head projected on the rectangular plane coordinate system xOy in fig. 1.

FIG. 5 is a right side view of the engine of FIG. 1 on a frame.

Fig. 6 is a plan view of the cylinder head projected on the rectangular plane coordinate system aOb in fig. 1.

Fig. 7 is a plan view of the horizontal distance of the cylinder head from the front axle of the vehicle and the horizontal distance of the cylinder head from the rear axle of the vehicle in fig. 1.

Fig. 8 is a top view of the engine of fig. 1 on a frame.

FIG. 9 is a schematic structural diagram of the engine, the fuel system and the air intake and exhaust system on the frame in FIG. 1.

FIG. 10 is a perspective view of the fuel system and air intake assembly of FIG. 9 on a vehicle frame.

FIG. 11 is a schematic view of the fuel system and air intake assembly of FIG. 9 at another angle on the vehicle frame.

Fig. 12 is a perspective view of the frame system of fig. 5.

Fig. 13 is a schematic view of the structure of the floor on the frame system of fig. 12.

Fig. 14 is a schematic structural view of the damper of fig. 5.

FIG. 15 is a perspective view of the engine, fuel system, and intake and exhaust system of FIG. 6.

FIG. 16 is a perspective view of the engine, fuel system, and intake and exhaust system of FIG. 6 from another angle.

Fig. 17 is a schematic view of the tube-in-tube muffler of fig. 21.

Fig. 18 is a partial cross-sectional view of the tube-in-tube muffler of fig. 21.

Fig. 19 is a front view schematic diagram of an engine arrangement of a straddle type all terrain vehicle provided by an embodiment of the present invention.

Fig. 20 is a schematic top view of an engine arrangement for a straddle atv provided by an embodiment of the present invention.

Fig. 21 is a side view schematically illustrating a pipe silencer according to an embodiment of the present invention.

Fig. 22 is a schematic top view of a pipe silencer according to an embodiment of the present invention.

Fig. 23 is a schematic view of the internal structure of a pipe silencer according to an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the structures related to the present invention or the technical terms used in the structures will be further described below, which are understood and explained according to the general genus in the art unless otherwise specified.

Referring to fig. 1-2 and 11-14, a straddle atv 100 according to an embodiment of the present invention includes an engine 10, a frame 20, a wheel assembly 30, an intake and exhaust system 40, a braking system 50, a transmission system 60, a fuel system 70, a saddle 80, an electrical system 90, a suspension system, and a steering system. The engine 10 is arranged on the frame 20 and used for providing power for the whole vehicle, the frame 20 is used for supporting a metal frame such as a vehicle engine 10, an air intake and exhaust system 40, a brake system 50, a transmission system 60, a fuel system 70, a saddle 80 plastic shell and the like, the wheel assembly 30 comprises a front wheel 31 and a rear wheel 32 which are arranged below the frame 20, the air intake and exhaust system 40 is connected with the engine 10, the brake system 50 is associated with the wheel assembly 30 to realize brake control, the transmission system 60 is arranged on the frame 20 and can transmit the power of the engine 10 to the wheel assembly 30, and the fuel system 70 is arranged at the front end of the frame to provide fuel for the engine 10; a saddle 80 supported on the frame 20 above the engine 10, and a suspension system provided on the frame 20 to provide shock absorption for the front wheel 31 and the rear wheel 32; the steering system is provided on the frame 20, and the front wheels 31 are controlled to turn left and right by the steering system.

Referring to fig. 1-4 and 11-14, in the present embodiment, the engine 10 includes an engine main body 14 and a cylinder head 11 connected to the engine main body 14 and located above the engine main body 14, and the engine 10 is disposed on the frame 20 and located below the frame 20, so that the center of gravity of the entire vehicle 100 can be effectively lowered. Specifically, the frame 20 is provided with an engine mount site which is formed by two spaced bottom plates 201 provided at the lower portion of the frame 20, and the bottom plates 201 have an inverted "V" configuration, but may have another configuration, such as an inclined flat plate or a metal pipe having an inclined plane. Four dampers 141 are connected to the bottom of the engine body 14, and the dampers 141 can absorb vibration of the engine 20, noise of the vehicle 100, and improve stability of the vehicle 100. Two shock absorbers 141 are correspondingly installed on one of the base plates 201, the other two shock absorbers 141 are correspondingly installed on the other base plate 201, and the shock absorbers 141 are arranged in an inclined manner, wherein the inclined large angle is 15-45 degrees. Specifically, the shock absorber 141 comprises an upper connecting plate 1411, a lower connecting plate 1412 and a shock absorption damping block 1413, the upper connecting plate 1411 is connected with a shaft on the bottom of the engine body 14, the shock absorption damping block 1413 is arranged between the upper connecting plate 1411 and the lower connecting plate 1412, the upper end surface of the shock absorption damping block 1413 is adhered to the upper connecting plate 1411, and the bottom surface of the shock absorption damping block 1413 is adhered to the lower connecting plate 1412; there is no joint between the lower connecting plate 1412 and the upper connecting plate 1411, and the lower connecting plate 1412 is connected to the bottom plate 201 by bolts.

The engine 10 further includes a transmission 13 provided on one side of the engine body 11, and in the present embodiment, the transmission 13 is a CVT transmission, but it is understood that the transmission 13 may be another transmission. After the engine 10 is mounted on the frame 20, the cylinder head 11 faces the rear end of the frame 20, and the cylinder head 11 is located below the saddle 80, which keeps the cylinder head 11 away from the legs of the rider, and the heat generated on the cylinder head 11 is isolated by the saddle 80, so that the heat on the cylinder head 11 is not transferred to the rider, which ensures high comfort when the rider drives the vehicle 100 and also enhances safety when the rider drives the vehicle 100.

As shown in fig. 1-4, the wheel assembly 30 includes a front wheel 31 near the front end of the frame 20 and a rear wheel 32 near the rear end of the frame, and the front wheel 31 is connected to the transmission system 60 via a front axle 311 and the rear wheel 32 is connected to the transmission system 60 via a rear axle 321. A plane orthogonal coordinate system xOy is drawn on the same plane where the side walls of the front wheel 31 and the rear wheel 32 lie. The center of the front wheel 31 and the center of the rear wheel 32 are both points on the x axis, and the midpoint of the connecting line of the center of the front wheel 31 and the center of the rear wheel 32 is the origin O of the rectangular coordinate system xOy, wherein the projection of the cylinder head 11 on the plane where the rectangular coordinate system xOy is located is in the first quadrant of the rectangular coordinate system xOy; that is, the cylinder head 11 is located on the rear side of the midpoint of the line connecting the center of the front wheel 31 and the center of the rear wheel 32, and is located near the rear end of the frame 20.

As shown in fig. 9-10, the fuel system 70 includes a fuel tank 701, the fuel tank 701 is mounted on the frame 20, and the fuel tank 701 is a thin-walled tank; the oil tank 701 is fixed to the front end of the frame 20, and the frame 20 has an oil tank mounting position formed by two cross bars 202 arranged at a distance from each other on the frame 20. Specifically, the two cross bars 221 have a width therebetween for accommodating the oil tank 701; the oil tank 701 is supported by the two cross bars 221, so that the position of the oil tank 701 on the frame 20 is maintained, and the stability of the oil tank 701 is high. And the projection of the oil tank 701 on the plane of the plane rectangular coordinate system xoy is in the second quadrant of the plane rectangular coordinate system xoy, so that the oil tank 701 is far away from the cylinder head 11, the oil tank 701 is not far away from the heat source of the engine 10, the heat of the oil tank 701 is less, the safety on the frame 20 is high, the temperature of the oil in the oil tank 701 is low, and the volatilization amount of the oil is small. The projection of the central point of the oil tank 701 on the plane where the plane rectangular coordinate system xoy is located is arranged on one side below the projection of the highest point of the cylinder head 11 on the plane where the plane rectangular coordinate system xoy is located, and the projection is deviated to the front end of the frame; the mode reduces the height of the oil tank 701 on the frame 20, so that the gravity center of the whole vehicle is reduced, and the stability of the vehicle is high in the turning process of the vehicle.

As shown in fig. 9-11, the intake and exhaust system 40 includes an intake assembly 41 and an exhaust assembly 42, and the intake assembly 41 is used for providing clean air to the engine 10 to maintain efficient combustion of fuel in the combustion chamber of the engine 10. The air inlet assembly 41 comprises an air filter 411, an air inlet pipe 412 and an air outlet pipe 413, wherein the air inlet pipe 412 is connected with the air filter 411 and is used for allowing air to enter the air filter 41 to filter impurities in the air; the outlet 413 is connected to the engine 10, and the filtered air is supplied to the engine 10 through the outlet 413, thereby supplying oxygen to the fuel. Specifically, the air filter 411 is located above the oil tank 701, and the air filter 411 is fixed to the frame 20 by bolts; therefore, the height of air cleaner 411 on the vehicle is increased, the air introduced into air cleaner 411 becomes cleaner, and air cleaner 411 has a long life. Meanwhile, the air inlet pipe 412 is arranged at the front end of the air filter 411, the air inlet pipe 412 is arranged in a bent manner, and an air inlet 412a of the air inlet pipe 412 faces the rear end of the frame 20; the air inlet 412a faces the rear end of the frame 20, which helps to prevent solid particles in the air from being passively filled into the air filter 411 due to the driving of the vehicle, and ensures that the air inlet amount of the air filter 411 is reasonable.

As shown in fig. 15 to 18, exhaust assembly 42 includes a pipe muffler 421 and an exhaust pipe 422 connecting pipe muffler 421 to head 11, where pipe muffler 421 is disposed at the rear end of frame 20. The pipe muffler 421 is provided with a connecting block 424, the connecting block 424 is a metal block closely attached to the outer wall of the pipe muffler 421, and the connecting block 424 is indirectly connected to the frame 20. The pipe muffler 421 includes a resonance chamber 4212, an exhaust chamber 4213, an intake chamber 4214, and a pressure dividing chamber 4215. The exhaust gas enters the air inlet chamber 4214 from the exhaust pipe 422, then flows into the resonant chamber 4212 from the air inlet chamber 4214, and the exhaust gas entering the resonant chamber 4212 is input into the exhaust chamber 4213 through a pipeline; part of the exhaust gas directly enters the partial pressure chamber 4215 through the resonance chamber 4212, and the exhaust gas in the partial pressure chamber 4215 also enters the exhaust chamber through a pipeline. Specifically, the air inlet cavity 4214 is located in the middle of the silencing pipe 421, and the cavity space of the air inlet cavity 4214 is the largest; a catalyst for catalyzing exhaust gas is contained in the intake chamber 4214. The exhaust pipe 422 is connected with the middle part of the pipe type silencer 421, namely the exhaust pipe 422 is communicated with the air inlet cavity 4214; this mode has prolonged the length of blast pipe 422, reduces the crookedness of blast pipe 422, reduces the resistance of waste gas circulation. Further, the partial pressure chamber 4215 is located at the forefront part of the silencing tube 421, and the resonance chamber 4212 is located between the air inlet chamber 4214 and the partial pressure chamber 4215; the exhaust chamber 4213 is located at the rearmost position on the muffler pipe 421, and the exhaust chamber 4213 is adjacent to the intake chamber 4214.

Specifically, a plurality of resonance tubes 4216 with two open ends are arranged in the resonance cavity 4212, the resonance tubes 4216 are communicated with the air inlet cavity 4214 and the pressure dividing cavity 4215, a plurality of resonance holes 4217 are arranged on the side edge of the resonance tube 4216, exhaust gas in the air inlet cavity 4214 flows in from one end of the resonance tube 4216, then part of the exhaust gas flows into the resonance cavity 4212 through the resonance holes 4217, and the other part of the exhaust gas flows into the pressure dividing cavity 4215 from the end part of the resonance tube 4216. A pipeline 4218 which is communicated with the resonant cavity 4212 and the exhaust cavity 4213 is arranged in the silencing pipe 421, and the pipeline 4218 is also communicated with the partial pressure cavity 4215 and the exhaust cavity 4213; the pipe 4218 is a pipe with two open ends, and a plurality of air holes are arranged on the side wall of the pipe 4218 at the part of the pipe 4218 positioned in the resonant cavity 4212, so that the exhaust gas in the resonant cavity 4212 enters the pipe 4218 through the air holes and then flows into the exhaust cavity 4213; one end of the pipe 4218 is positioned in the partial pressure chamber 4215, and the exhaust gas in the partial pressure chamber 4215 flows into the exhaust chamber 4213 from one end of the pipe 4218 through the pipe 4218.

Further, the tubular muffler 421 is provided with an exhaust pipe 423, the exhaust pipe 423 is connected to the exhaust chamber 4213, and the exhaust entering the exhaust chamber 4213 is discharged to the outside air through the exhaust pipe 423. The position of the exhaust pipe 423 is preferably arranged at the lower end of the circumferential wall of the pipe muffler 421, specifically, the exhaust pipe 423 is bent, an exhaust outlet of the exhaust pipe 423 is obliquely aligned with the bottom surface of the lower end, and an end portion of the exhaust pipe 423, which is communicated with the exhaust chamber 4213, is inserted into the exhaust chamber 4213, and the exhaust pipe 423 located in the exhaust chamber 4213 is vertically arranged.

As shown in fig. 11-12, electrical system 90 includes a battery 91, and battery 91 is used to provide engine 10 with the power required for ignition, as well as to provide other electrical power for the vehicle. The battery 91 is located at a front lower portion of the frame 20 and adjacent to the engine 10, and the battery 91 is located at a side away from the transmission 13, whereby heat of the transmission 13 is not transferred to the battery 91; the working temperature of the battery 91 is reduced, the working life of the battery 91 is prolonged, and the potential safety hazard of thermal explosion of the battery 91 is eliminated. Specifically, a battery mounting position is arranged on the frame 20, the battery mounting position is a battery support plate 203 fixed on the frame 20, and the battery support plate 203 is positioned at the lower part of the frame 20 and is arranged at one side far away from the transmission 13; the battery 91 is placed on a battery support plate 203. The edges around the battery support plate 203 are turned upwards to form a flange 2031, the battery 91 is erected on the battery support plate 203, and the flange 2031 limits the battery 91, so that the battery 91 is stable and does not move while the heat dissipation of the battery 91 is ensured; meanwhile, a heat dissipation hole 2032 is formed in the center of the battery support plate 203, and the heat dissipation hole 2032 is used for increasing heat dissipation of the battery 91 and keeping the battery 91 capable of working at normal temperature.

As shown in fig. 1-2, brake system 50 includes parking assembly 51, parking assembly 51 being configured to park vehicle 100 after vehicle 100 is stationary to prevent vehicle 100 from rolling; the parking assembly 51 comprises a parking mechanism 511, a hand brake cable 512 and a handle 513; one end of the brake cable 512 is connected to the parking mechanism 511, and the other end is connected to the handle 513, and by pulling the handle 513, the force on the handle 513 is transmitted to the parking mechanism 511 through the brake cable 512, thereby parking the vehicle 100. Specifically, the handle 513 is indirectly connected to one side of the frame 20, and one end of the handle 513 is rotatably connected, so that when the handle 513 is used, only one end of the handle 513 needs to be pulled to rotate the handle by a certain angle, and the handle 513 is located on one side of the oil tank 701 on the vehicle 100 and close to the front end of the saddle 80; this position may facilitate pulling the handle 513 to park the vehicle 100, and may be convenient to operate, time saving and labor saving. A shift lever 601 is indirectly arranged on the frame 20, the shift lever 601 is close to the front end of the saddle 80, the position of the shift lever 601 corresponds to that of the handle 513, namely the shift lever 601 is arranged on one side of the frame, and the handle 513 is arranged on the other side of the frame; this mode can be convenient for when driving the vehicle, but manual shift, and it is convenient to shift.

As shown in fig. 1 to 3 and 5, in another embodiment, the center of gravity of the vehicle 100 is point a, and the center of gravity of the engine 10 is point B, where the projection of point a on the plane of the rectangular planar coordinate system xOy is located on the front side of the projection of point B on the plane of the rectangular planar coordinate system xOy, that is, the horizontal distance from point B to the axis of the rear wheel 32 is smaller than the horizontal distance from point a to the axis of the rear wheel 32. The other structures of the present embodiment are the same as those of the above embodiments, and therefore, the description thereof is omitted.

As shown in fig. 1 to 3 and fig. 6, in another embodiment, the distance between the cylinder head 11 and the front shaft 311 of the engine 100 is Le, the distance between the cylinder head 11 and the rear shaft 321 is Lf, and the relationship between Le and Lf is: le is more than or equal to Lf. The other structures of the present embodiment are the same as those of the above embodiments, and therefore, the description thereof is omitted.

As shown in fig. 1-3 and 7, in other embodiments, a plane rectangular coordinate system aOb is made on the same plane where the line connecting the centers of the two front wheels 31 and the line connecting the centers of the two rear wheels 32 of the vehicle 100 are located, where the horizontal axis of the plane rectangular coordinate system aOb is the a axis, the vertical axis thereof is the b axis, and the intersection point is 0 point; and the projection of the wheelbase center line along the length direction of the vehicle on the plane where the rectangular plane coordinate system aOb is located on the vehicle 100 coincides with the axis a, and the projection of the whole vehicle center line along the width direction of the vehicle on the plane where the rectangular plane coordinate system aOb is located coincides with the axis b. The projection of the midpoint C of the cylinder head 11 on the plane where the plane rectangular coordinate system aOb is located in the first quadrant of the plane rectangular coordinate system aOb, and the projection of the cylinder head 11 on the plane is offset above the wheelbase center line. The other structures of the present embodiment are the same as those of the above embodiments, and therefore, the description thereof is omitted.

As shown in fig. 1-3 and 8, in other embodiments, the exhaust passage on cylinder head 11 opens toward pipe muffler 421. The other structures of the present embodiment are the same as those of the above embodiments, and therefore, the description thereof is omitted.

As shown in fig. 19-23, in the engine arrangement structure of the straddle type all terrain vehicle shown in fig. 1-5, the straddle type all terrain vehicle according to the embodiment of the present invention includes a frame 25 and an engine 15 fixed on the frame 25, one end of the engine 15 provided with a cylinder head 151 faces the rear end of the frame 25, and a connection port for connecting an exhaust pipe 152 on the cylinder head 151 faces the rear end of the frame 25.

This engine 15 arrangement structure is through arranging cylinder head 151 in the engine 15 and be close to the one side of the rear end of frame to the connector that corresponds and be connected with exhaust pipe 152 on cylinder head 151 arranges towards the rear end of frame 25, thereby makes exhaust pipe 152 and muffler 35 structure need not run through whole vehicle, and the driver's that is located the frame 25 middle part straddles the position and does not have the exhaust pipe to pass through, thereby makes the temperature sense of the straddling position of driver obviously reduce, has promoted driver's driving experience.

It should be noted that, for those skilled in the art, all-terrain vehicles are generally single-cylinder engines, and the cylinder head 151 of the single-cylinder engine is connected with an exhaust pipe 152, and exhaust gas is exhausted through the exhaust pipe 152.

In some more specific embodiments, since the cylinder head 151 is disposed on the rear end side of the engine 15 facing the frame 25, and the connection port of the cylinder head 151 and the exhaust pipe 152 is also directed toward the rear end of the frame 25, resulting in a reduction in the arrangement space of the muffler, in order to meet the spatial arrangement of the muffler, the above-described structure form in which the muffler is disposed on the exhaust pipe 35 preferably employs a pipe muffler 35, the pipe muffler 35 includes an air inlet 36 and an air outlet 37, and the air inlet 36 of the pipe muffler 35 is disposed at an intermediate position of the circumferential wall of the pipe muffler 35. Thereby effectively saving the arrangement space of the silencer.

In a further embodiment, the air outlet 37 of the above-described pipe muffler 35 is preferably disposed at the rear lower end of the circumferential wall of the pipe muffler 35. By arranging air outlet 37 at the rear lower end of the circumferential wall of tubular muffler 35, it is possible to avoid rain, snow, weather, rain, etc. from entering the interior of tubular muffler 35 through air outlet 37 and affecting the normal service life of tubular muffler 35. It is to be understood that the above-mentioned manner of disposing the air outlet 37 at the rear lower end of the circumferential wall of the tubular muffler 35 is only a preferable example of the embodiment of the present invention, and in practical applications, the air outlet 37 may be disposed at the rear end face of the tubular muffler 35, or may be disposed at other positions according to requirements.

Here, as shown in fig. 5, the pipe muffler 35 includes a pipe cylinder 351, an intake chamber 3511 directly communicating with the intake port 36, a front muffling chamber 3512 located at a front end of the intake chamber 3511, and a rear muffling chamber 3513 located at a rear end of the intake chamber 3512 are provided at a middle portion of the pipe cylinder 351, the intake chamber 3511 communicates with the front muffling chamber 3512, the front muffling chamber 3512 communicates with the rear muffling chamber 3513 via a connecting pipe 3514, and the air outlet 37 communicates with the rear muffling chamber 3513. Through the structure of above-mentioned tubular muffler 35, its exhaust gas circuit is during tail gas gets into air inlet chamber 3511 from air inlet 36, then gets into preceding amortization chamber 3512 and carry out preliminary amortization, then through connecting tube 3514 with the leading-in back amortization chamber 3513 of tail gas in the preceding amortization chamber 3512 in carry out the amortization once more, at last by the gas outlet 7 of connecting on the back amortization chamber 3513 with tail gas outgoing. Through the tubular muffler 35 of above-mentioned structure, can guarantee to practice thrift outside the muffler arrange the space to adopt the silencing effect of the reinforcing muffler that the structure of once again can also be better. It should be noted that the top of the tube cylinder of the tube type muffler 35 is generally further provided with a mounting position 38 for facilitating mounting to the vehicle body, and the specific structure of the mounting position may adopt a double-lifting-lug structure, or other structural forms commonly used by those skilled in the art, and is not limited in detail here. And the wall of the tube body is also provided with an interlayer structure of silencing materials, thereby ensuring the good silencing effect of the silencer. The specific structure of the cylinder wall can be a double-layer stainless steel structure, and silencing materials such as silencing cotton are filled in the middle of the double-layer stainless steel plate. In addition, it should be noted that the porous suction structures 350 are generally disposed inside the front muffling chamber 3512 and the rear muffling chamber 3513, and are well known to those skilled in the art, and the specific structures thereof will not be described.

In some more specific embodiments, the frame 25 is provided with a connection position 251 for fixing the engine 15 at a position corresponding to the bottom of the engine 15. It is understood that the above-mentioned manner of disposing the connection position at the bottom of the corresponding engine is merely a preferred example of the embodiment of the present invention, and during the practical application, the connection position may be disposed at other positions according to practical requirements.

In still further embodiments, the attachment locations 251 include a front attachment location 2511 disposed proximate a front end of the rack 25 and a rear attachment location 2512 disposed proximate a rear end of the rack 25. And to provide greater stability of the engine 15 to the frame 25, lateral movement of the engine 15 relative to the frame 25 is avoided. The connection plane of the front connection point 2511 and/or the rear connection point 2512 is at a predetermined inclination angle with the bottom plane of the engine 15. Through setting up preset inclination, the connection plane of connection position 251 supports through the inclined plane and realizes realizing the horizontal spacing of the relative frame 25 of engine 15 when realizing supporting fixed engine 15 for horizontal spacing is more reliable and more stable.

In a further technical scheme, the preset inclination angle is preferably 15-45 degrees. It is understood that the above is only a preferred example of the specific value of the preset inclination angle, and in practical application, other preset angle values can be selected according to practical requirements.

In addition, the present invention also provides a straddle type all-terrain vehicle comprising the engine arrangement as described in any of the above aspects. Since the engine arrangement structure of the straddle type all-terrain vehicle has the technical effects, the straddle type all-terrain vehicle with the engine arrangement structure also has the corresponding technical effects, and the detailed description is omitted.

The present invention provides a straddle type all terrain vehicle and an engine arrangement as described in detail above. It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

It is also noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.

All patents and publications mentioned in the specification of the invention are indicative of the techniques disclosed in the art to which this invention pertains and are intended to be applicable. All patents and publications cited herein are hereby incorporated by reference to the same extent as if each individual publication was specifically and individually indicated to be incorporated by reference. The invention herein may be practiced in the absence of any element or elements, limitation or limitations, which limitation or limitations is not specifically disclosed herein. The terms and expressions which have been employed herein are used as terms of description and not of limitation, and there is no intention in the use of such terms and expressions of excluding any equivalents of the features shown and described, but it is recognized that various modifications and changes may be made within the scope of the invention and the claims which follow. It is to be understood that the embodiments described herein are preferred embodiments and features and that modifications and variations may be made by one skilled in the art in light of the teachings of this disclosure, and are to be considered within the purview and scope of this invention and the scope of the appended claims and their equivalents.

Claims

1. A straddle type all terrain vehicle comprising:

a frame;

the wheel assembly comprises a front wheel and a rear wheel which are arranged below the frame;

the engine is arranged on the frame and used for providing power for the whole vehicle, and comprises an engine main body and a cylinder head which is connected with the engine main body and is positioned above the engine main body;

an intake and exhaust system including an intake assembly for providing air to the engine and an exhaust assembly for exhausting exhaust gas produced by the engine;

a brake system associated with the wheel assembly including a parking assembly and a brake assembly;

a steering system associated with the wheel assembly for controlling rotation of the wheel assembly;

a suspension system associated with the wheel assembly for providing shock absorption to the wheel assembly;

the electric system is arranged on the frame and used for providing electric power for ignition of the engine;

the transmission system is arranged on the frame and is used for transmitting the power of the engine to the wheel assembly;

the fuel system is arranged at the front end of the frame and used for supplying fuel to the engine;

a saddle supported on the frame and positioned above the engine;

characterized in that the cylinder head faces the rear end of the frame; the projection of the cylinder head on the same plane where the side walls of the front wheel and the rear wheel on the same side of the vehicle are located is located on one side of the rear of the projection of the midpoint of the circle center connecting line of the front wheel and the rear wheel of the vehicle on the plane, and the cylinder head is close to the rear end of the vehicle frame.

2. The straddle type all terrain vehicle of claim 1, wherein the vehicle has a vehicle centerline along the length of the vehicle, and wherein a projection of the cylinder head onto a plane on which a line connecting centers of two front wheels and a line connecting centers of two rear wheels of the vehicle lie is offset above a projection of the vehicle centerline onto the plane.

3. The straddle ATV of claim 1, wherein the cylinder head is oriented toward the rear end of the frame at a horizontal distance Le from the front axle of the vehicle and a horizontal distance Lf from the rear axle of the vehicle, wherein Le ≧ 2 Lf.

4. The straddle-type all terrain vehicle of claim 1, wherein a projection of a center of gravity point of the vehicle onto a same plane as side walls of the front and rear wheels on a same side of the vehicle is located on a forward side of a projection of the center of gravity point of the engine onto the plane.

5. The straddle-type all terrain vehicle of claim 1, wherein the fuel system comprises:

an oil tank;

the oil tank is arranged at the front end of the frame;

the projection of the central point of the oil tank to the same plane where the side walls of the front wheel and the rear wheel are located is positioned below the projection of the highest point of the cylinder head on the plane.

6. The straddle-type all terrain vehicle of claim 1, wherein the air intake assembly comprises:

an air filter;

the air inlet pipe is connected with the air filter and is used for allowing air to enter the air filter;

the air outlet pipe is matched with the air filter so that filtered air can enter the cylinder head; the air filter is positioned above the oil tank.

7. The straddle-type all terrain vehicle of claim 1, wherein the exhaust assembly comprises:

the tubular muffler is arranged on the frame, and a catalyst for catalyzing the oxidation of waste gas is arranged in the tubular muffler;

the exhaust pipe is arranged between the tubular muffler and the cylinder head, one end of the exhaust pipe is connected with the cylinder head, and the other end of the exhaust pipe is connected with the middle part of the tubular muffler;

the tubular muffler is provided with:

a resonant cavity;

an exhaust chamber;

the air inlet cavity is arranged between the resonant cavity and the exhaust cavity; the exhaust pipe is communicated with the air inlet cavity; the waste gas enters the resonant cavity from the gas inlet cavity and then flows into the gas outlet cavity through the pipeline; a plurality of resonance tubes are arranged in the resonance cavity, and resonance holes for allowing exhaust gas to enter the resonance cavity are formed in the side walls of the resonance tubes; the part of the pipeline, which is positioned in the resonant cavity, is provided with a plurality of air holes for waste gas to enter the pipeline; the tubular muffler is provided with a partial pressure cavity adjacent to the resonant cavity, one end of the pipeline is positioned in the partial pressure cavity, and waste gas enters the pipeline from the pipeline port.

8. The straddle-type all terrain vehicle of claim 1, wherein the engine further comprises:

a transmission provided on one side of the engine main body;

the straddle type all terrain vehicle further comprises a battery;

the frame is provided with a battery mounting position, and the battery mounting position is arranged on one side far away from the transmission; the battery mounting position is a battery support plate arranged at the front lower part of the frame.

9. The straddle type all terrain vehicle of claim 1, wherein the frame is provided with an engine mounting location for supporting the engine, and the bottom of the engine body is provided with an obliquely arranged shock absorber, and the shock absorber is connected with the engine mounting location to form an inverted V-shaped support for the engine.

10. The straddle type all terrain vehicle of claim 9 wherein the engine mount location is a floor disposed at a lower portion of the frame, the floor having at least one flat surface.

11. The straddle type all terrain vehicle of claim 7, wherein a side of the engine body on which the cylinder head is disposed is located near a rear end of the frame, and wherein a connection port of the cylinder head for connection to an exhaust pipe is directed toward the rear end of the frame.

12. The straddle-type all terrain vehicle of claim 11, wherein the tubular muffler comprises an air inlet and an air outlet, the air inlet being disposed at a medial position of a circumferential wall of the tubular muffler; the air outlet is arranged at the rear lower end of the circumferential wall of the tubular muffler.

13. The straddle-type all terrain vehicle of claim 12, wherein the tube muffler comprises a tube body, a middle portion of the tube body is provided with an intake chamber directly communicating with the intake port, a front muffling chamber located at a front end of the intake chamber, and a rear muffling chamber located at a rear end of the intake chamber, the intake chamber is communicated with the front muffling chamber, the front muffling chamber is communicated with the rear muffling chamber through a connecting pipe, and the outlet port is communicated with the rear muffling chamber.

14. The straddle-type all terrain vehicle of claim 13, wherein the interior of both the front sound-deadening chamber and the rear sound-deadening chamber are provided with a porous suction structure.

15. The straddle type all terrain vehicle of claim 10, wherein a bottom surface of the engine body is provided with a shock absorber connected to the bottom plate, a bottom surface of the shock absorber being at a predetermined inclination angle on the engine body; the preset inclination angle is 15-45 degrees.