KR20070015022A - Rockable three-wheeled vehicle - Google Patents

Abstract

A three wheel vehicle is provided to make a rear body of the three wheel vehicle by supporting and effectively arranging functional parts of the rear body. In a three wheel vehicle, a rear body(18) is connected to the rear side of a front body so that the rear body can be transversely fluctuated with respect to the front body. The rear body is covered with an integrally formed cover. The cover surrounds an engine, a portion of a rear wheel driven by the engine, and an exhaust system of the engine. A cylinder section of the engine is disposed in the interior of the cover, the cylinder section being inclined toward the front side. A catalyst chamber for purifying exhaust gas and a noise chamber are installed in the exhaust system. A fuel injection valve for supplying fuel into the engine and a throttle body are arranged in the interior of the cover.

Description

Rocking tricycle {ROCKABLE THREE-WHEELED VEHICLE}

1 is a side view showing a rocking tricycle according to the present invention.

Fig. 2 is a side view showing the rear wheel body of the rocking tricycle (first embodiment) according to the present invention.

3 is a plan view showing a main part of a rocking tricycle (first embodiment) according to the present invention.

4 is a side view illustrating the arrangement of the radiators according to the present invention.

FIG. 5 is a view seen from arrow 5 shown in FIG. 4.

Fig. 6 is a side view showing the louver board and the radiator according to the present invention.

FIG. 7 is a cross-sectional view (first embodiment) taken along 7-7 shown in FIG. 3.

FIG. 8 is a sectional view (first embodiment) seen along 8-8 shown in FIG.

9A and 9B show respective behaviors of the flow of exhaust gas in the muffler and catalyst pipe according to the first embodiment of the present invention.

Fig. 10 is a side view showing the rear vehicle body of the rocking tricycle (second embodiment) according to the present invention.

11 is a plan view showing a main part of a rocking tricycle (second embodiment) according to the present invention.

Fig. 12 is a front view showing the rear vehicle body of the oscillating tricycle (second embodiment) according to the present invention.

13A and 13B are sectional views showing the air cleaner according to the present invention.

14a and 14b show the behavior of the flow of intake air in an air cleaner according to the invention.

<Description of the reference sign>

10 ... Downsized vehicles (rocking, rocking tricycle)

14 ... front body

16 rear wheel

18.Rear body

51.Intake system

52 ... Exhaust system

53 ... cover

71 ... stay (without stay)

73 ... radiator

76.Engine

91.Fuel injection valve

93.cylinder part

96 ... Throttle Body

98 ... Air Cleaner

107 catalyst chamber (catalyst pipe)

108 ... Connection pipe (rear exhaust pipe)

111.Noise room (muffler)

130 ... driving parts

140. Centerline of the body

143 ... air cleaner case

146.2nd duct part (duct chamber)

3rd duct part (upper duct)

151a ... first opening

170 ... case

190 ... case

197 ... one chamber on first side (first chamber)

199 ... chamber (third chamber) on the downstream side of one chamber on the upstream side

218 First duct part

235 ... Intake vent

The present invention relates to an improvement of a rocking tricycle, and more particularly, to an intake duct structure, an intake system structure, an exhaust system and a rear body structure of an air cleaner in a rocking tricycle.

In the rocking tricycle of the conventional type, it is known that a cover is provided in the rear vehicle body (for example, refer patent document 1).

In the conventional type of exhaust system, it is known that the catalyst case is arranged below the engine in a muffler and in a separate case (see Patent Document 2, for example). BACKGROUND ART A motorcycle exhaust system provided with a muffler and a catalyst is known (see Patent Document 3, for example).

With respect to the conventional type intake system structure of the conventional type rocking tricycle and the conventional type intake duct structure of the conventional type air cleaner, the inlet of the air cleaner is provided above the cover for covering the power unit, and the air cleaner is substantially It is known to arrange behind an upright cylinder (for example, refer patent document 4).

[Patent Document 1] Japanese Utility Model Publication No. 6952/1987

[Patent Document 2] Japanese Patent Laid-Open No. 183019/1984

[Patent Document 3] Japanese Patent Laid-Open No. 1994/10659

[Patent Document 4] Japanese Patent Laid-Open No. 58632/1984

In Fig. 1 of Patent Document 1, a swinging tricycle 1 is shown, and a rear vehicle body 3 on which a pair of left and right rear wheels 19 is provided is a front wheel 4, a handlebar 5, a low deck 6 ) And the seat 8 are attached to the rear of the front vehicle body 2, so that the rear vehicle body can swing in the lateral direction.

In addition, in FIG. 5 of patent document 1, the cover 20 is provided in the rear vehicle body, and the power unit 12 formed by the engine 13 and the transmission case 14, the carburetor 16, the air cleaner ( 17, the muffler 15 and the left and right rear wheels 19 and 19 are housed inside the cover 20 and partitions 24 and 24 for partitioning the space between each rear wheel 19 and 19 and between them. ) Are arranged inside each of the left and right rear wheels 19 and 19 so that the partition extends in the longitudinal direction, and the partition plate 26 extends in the longitudinal direction so that the partition plate 26 extends in the air cleaner 17 and the muffler ( 15) is arranged in between.

3 of Patent Literature 1 shows that the cover 20 includes: a front plate 21 covering the front of the engine 13; A midplane 22 extending backward from the front plate and whose rear end bent backwards and obliquely downward; Side plates 23 and 23 extending from the left and right of the middle plate 22 and covering the outside from above the rear wheels 19 and 19 (see FIG. 5). Each of these members is attached to the power unit 12, and the compartments 24 and 24 are attached to the transmission case 14 and the upper part of the cover 20, as shown in FIG.

In FIG. 1 of Patent Document 2, the exhaust pipe 2 extends back and down from the front of the engine 1, the exhaust muffler 4 is connected to the exhaust pipe 2 through the connecting pipe 5, A motorcycle is shown in which the connecting pipe 5 is arranged below the engine 1. FIG. 2 of patent document 2 shows that the catalyst case 6 is installed in the connecting pipe 5 and the honeycomb catalyst 8 is accommodated in the catalyst case 6.

In FIG. 1 of Patent Document 3, the exhaust pipe 5 extends from the lower side in front of the engine 3 mounted on the motorcycle 1 toward the rear of the vehicle body, and the muffler 6 is rear of the exhaust pipe 5. The motorcycle 1 is shown connected to the end. 2 and 3 of patent document 3, the 1st auxiliary catalyst 10a is installed in the pipe 5b of the exhaust pipe 5, and the 1st expansion chamber A, the 2nd expansion chamber B, and 1st The third expansion chamber C is formed by partitioning the inside of the shell 16 of the muffler 6 with the first thermal insulator 14 and the second thermal insulator 15, and the first expansion chamber A and The main catalyst 18 is installed so that the second expansion chamber B communicates with each other.

2, 3 and 5 of Patent Document 4, the upper inlet duct 30 is installed above the cover 11 for covering the power unit 12, and the upper end of the lower inlet duct 31 is the upper inlet duct ( 30, the lower inlet duct 31 extends downwardly, and the communication tubes 17, 18, 19 are connected in the middle of the lower inlet duct 31, and these communication tubes 17, 18, 19 are The inlet duct structure is shown extending substantially horizontally and connected to the case 16 of the air cleaner 15. The length in the longitudinal direction of the air cleaner 15 is larger than the width in the transverse direction.

As shown in FIG. 3 of patent document 1, since the cylinder part of the engine 13 is arrange | positioned substantially upright, the position of the center 22 of the cover 20 is high, and the rear vehicle body 3 is located in a high position. Also, recent environmental considerations are expected in downsized oscillating tricycles.

In addition, the lower part of the cover 20 is attached to the front and rear of the power unit 12, the attachment of the cover 20 is not easy, it is required to ensure the rigidity of the cover. In addition, as the performance improvement of each functional part is required, each functional part is required to be efficiently arranged and attached.

In Patent Document 2, since the connecting pipe has an outer diameter substantially equal to the outer diameter of the exhaust muffler 4, the connecting pipe 5 containing the honeycomb catalyst 8 is bulky, and the arrangement thereof is limited. In addition, the connecting pipe affects the minimum road clearance of the motorcycle. In addition, since the connection pipe 5 is exposed to the outside, the arrangement of the heat insulator needs to be taken into account in the design, for example in the case where the heat insulator is installed in the connection pipe 5.

In Patent Document 3, the first auxiliary catalyst 10a is arranged in the exhaust pipe 5 and the main catalyst 18 is arranged in the muffler 6.

However, since the main catalyst 18 is arranged in the muffler 6, the muffler 6 is upsized and the width behind the motorcycle 1 is extended. That is, the rear of the vehicle body is upsized. In such downsized vehicles, there is a need to make the muffler more compact since the space available is limited. In addition, by arranging the main catalyst 18 on the muffler 6, the center of gravity of the muffler 6 is increased, and as a result, the center of gravity of the vehicle body is increased.

For example, when the main catalyst 18 is housed in a shell 16 and a separate case of the muffler 6 and arranged in a different space, for example the space above the engine 3, Space can be used efficiently.

In addition, the exhaust pipe 5 needs to be extended to reduce the exhaust noise generated by the predetermined engine speed, and a predetermined length of the exhaust pipe is required to be secured. However, when the length of the exhaust pipe extends only in the longitudinal direction, the longitudinal direction of the vehicle body extends.

In addition, when the first co-catalyst 10a, the second co-catalyst 10b and the main catalyst 18 are installed in the exhaust path of the exhaust pipe 5 and the muffler 6, the next catalyst is on the exhaust path. Since the flow of the exhaust gas is disturbed and the output of the engine is lowered, for example, a reduction in the resistance of the exhaust passage in the exhaust pipe 5 and the muffler 6 is required to improve the output.

In recent years, for a rocking tricycle, a vehicle with reduced fuel and suitable for the environment is required, and in order to realize such a vehicle, a more compact arrangement of vehicle component parts including a new configuration is also expected.

As shown in Patent Literature 4, when the area of the air cleaner 15 side is large, for example, when the air cleaner 15 is arranged at a position deflected from the center to the left or right in the lateral direction of the vehicle body, A special noise prevention structure may be required so that the intake noise of 15) is easily radiated and the intake noise is not leaked to the outside. Since the air cleaner 15 is deflected to the left or the right, the capacity of the air cleaner 15 is limited and it is difficult to secure the capacity.

Water droplets and dust that enter the lower inlet duct 31 through the upper inlet duct 30 fall to the bottom of the lower inlet duct 31, while the droplets and small dust, while falling, communicate tube 17, 18, 19. Through the air cleaner 15 can be entered.

In addition, as shown in FIG. 5 of Patent Document 4, the width in the vehicle body transverse direction of the upper inflow duct 30 is larger than the width in the vehicle body transverse direction of the air cleaner 15, and the width of the lower inflow duct 31 is reduced. Since the width is substantially half of the width of the air cleaner, and a large space is required, the vehicle body is upsized.

An object of the present invention is to improve a rocking tricycle and to further downsize and compact the rear body by the effective arrangement and support of each functional part of the rear body in consideration of the environment.

Another object of the present invention is to effectively utilize the space of the vehicle, to compact and downsize the vehicle body, to lower the center of gravity of the vehicle body, and to limit the length of the exhaust pipe in the longitudinal direction while ensuring the length of the exhaust pipe. And by improving the exhaust system of the oscillating tricycle, the output characteristics required for the engine are each easily obtained.

Another object of the present invention is to make it easy to secure the capacity of the air cleaner, to reduce the intake noise, to more efficiently remove the water droplets and dust from the intake air, the intake duct structure of the air cleaner of the rocking tricycle The vehicle body can be made compact by improving the structure of the intake system.

According to the invention disclosed in claim 1, the rear body is connected to the rear side of the front body so that the rear body can swing laterally relative to the front body, and the rear body is covered with an integrated cover, and the cover is an engine, an engine It is based on part of the rear wheels driven by the swinging tricycle surrounding the exhaust system of the engine. The cylinder part of the engine is arranged inside the cover in an inclined state toward the front. A catalyst chamber and a noise chamber for purifying exhaust gas are installed in the exhaust system, and a fuel injection valve and a throttle body for supplying fuel to the engine are arranged inside the cover.

By inclining the cylinder portion forward, the space above the engine can be used effectively. In addition, the fuel injection valve and the throttle body can accurately control the amount of fuel and air supplied to the combustion chamber of the engine, and the exhaust gas can also be cleaner by the catalyst chamber. In addition, since the engine, the rear wheel, the catalyst chamber, the noise chamber, the fuel injection valve and the throttle body are located inside the integrated cover, each of the components described above can be efficiently and collectively protected and the appearance can be improved.

The invention disclosed in claim 2 is characterized in that the radiator is arranged inside the cover.

Even if the blowing wind hardly contacts the engine inside the cover, the engine is sufficiently cooled by contacting the blowing wind with the radiator.

In addition, since the engine and the radiator are arranged inside the cover, the radiator hose connecting the engine and the radiator is shortened.

The invention disclosed in claim 3 is based on a rocking tricycle in which the rear body is connected to the rear side of the front body so that the rear body can swing laterally relative to the front body. An engine for driving the rear wheels and a plurality of functional parts provided above the engine are arranged in the rear vehicle. A cover for covering the engine and the plurality of functional parts is fixed to the engine by the stay. As seen from above, the stay is arranged such that the functional part is partitioned.

When the stay is attached to the top of the engine and the cover is fixed to the top of the stay, the cover is easily attached and the attachment is secure. In addition, each functional component can be arranged efficiently and systematically.

The invention disclosed in claim 4 is characterized in that the stay partitions a noise chamber and a catalyst chamber which respectively form an exhaust system of the engine as a functional part, and an air cleaner and a throttle body which respectively form an intake system of the engine as a functional part. .

As seen from above, the group of catalyst chamber and silencer, and the group of air cleaner and throttle body are partitioned. The catalyst chamber, silencer, air cleaner and throttle body can be functionally and systematically arranged, for example, a thermal insulator can be easily attached to the stay to prevent heat generated in the exhaust system from being transferred to the intake system. .

The invention disclosed in claims 5 and 10 is based on the exhaust system of a rocking tricycle, in which the catalyst chamber and the noise chamber are housed in separate cases in the exhaust system. The catalyst chamber is arranged above the engine, and the noise chamber is arranged behind the engine and below the catalyst chamber.

The catalyst chamber is arranged above the engine, and the space above the engine is effectively used. In addition, since the catalyst chamber and the noise chamber are accommodated in separate cases, the size of the noise chamber is not increased, and the entire length of the exhaust pipe extending from the engine side can be ensured to communicate the catalyst chamber and the noise chamber with each other. In addition, by arranging the noise chamber behind the engine and below the catalyst chamber, the entire length of the exhaust pipe can also be ensured. In addition, by lowering the position of the relatively heavy noise chamber, the center of gravity of the vehicle body can be lowered. In addition, the external shape behind the vehicle body can be reduced.

The invention disclosed in claims 6 and 11 is based on the exhaust system of a rocking tricycle, in which the catalyst chamber and the silencer are housed in separate cases in the exhaust system. As viewed from above, the catalyst chamber and the silencer are arranged such that each longitudinal direction of the catalyst chamber and the noise chamber is orthogonal, and components such as an air cleaner and a throttle body forming the intake system of the engine are provided. It is arranged in the space to be made into both sides.

Arranging one of the catalyst chamber or the noise chamber so that the longitudinal direction extends in the longitudinal direction of the vehicle body, and arranging the other one so that the longitudinal direction extends in the width direction of the vehicle body may, for example, You can limit it. In addition, a rectangular space having both sides of the noise chamber and the catalyst chamber can be formed. Component parts such as air cleaners and throttle bodies can be efficiently and compactly arranged in a square space.

The invention disclosed in claims 7 and 12 is based on the exhaust system of a rocking tricycle, in which the catalyst chamber and the silencer are housed in separate cases in the exhaust system. A plurality of paths are provided for guiding the exhaust gas discharged from the catalyst chamber into the noise chamber. Of these paths, the main path is open to either chamber on the upstream side of the silencer, and the other path is open to the chamber on the downstream side of either chamber on the most upstream side of the silencer.

By the plurality of paths for guiding the exhaust gas discharged from the catalyst chamber to the noise chamber, the cross-sectional area of each passage of the exhaust gas is expanded, and the exhaust resistance of the exhaust gas is reduced.

In the invention disclosed in claims 8 and 13, the connection pipe for connecting the catalyst chamber and the noise chamber is formed of multiple pipes, and the plurality of paths are formed by a plurality of passages of the multiple pipes.

The connecting pipe is formed of multiple pipes, and the path of the exhaust gas becomes compact. Since multiple pipes connect the catalyst chamber and the silencer, the connection is assured.

The invention disclosed in claims 9 and 14 is based on the exhaust system of a rocking tricycle, in which the catalyst chamber and the noise chamber are accommodated in separate cases in the exhaust system. A catalyst chamber is installed between a pair of left and right rear wheels driven by an engine, and is provided inside an integrated cover covering each upper portion of the left and right rear wheels.

The catalyst chamber is provided between the left and right rear wheels, and the space between the rear wheels is effectively used. The catalyst chamber is covered with a cover, and the appearance quality is improved.

15 and 20 disclose that the oscillating tricycle includes an intake system structure, wherein an air cleaner forming the intake system structure is arranged between the left and right rear wheels and to adjust the intake air flow of the fuel supply system provided with the fuel injection valve. It is characterized in that it is located behind the throttle body.

The fuel injection valve can be arranged over the inclined cylinder portion forward, so that the space can be effectively used. A throttle body is installed to regulate the intake air flow of the fuel supply system in which the fuel injection valve is installed to save fuel and clean the exhaust gas.

Further, by arranging the air cleaner between the left and right rear wheels, the capacity of the air cleaner can be increased, and by arranging the air cleaner behind the throttle body located substantially center in the vehicle body width direction of the engine, the air cleaner is arranged in the vehicle body width direction. It can be arranged in a substantial center, and the intake noise of the air cleaner hardly leaks out of the vehicle body.

In addition, the space between the rear wheels can be effectively used behind the throttle body.

The invention disclosed in claims 16 and 21 is characterized in that the throttle body and the fuel injection valve are arranged on the body center line extending in the vehicle body longitudinal direction.

Since the engine is substantially arranged on the centerline of the vehicle body, and the throttle body is also arranged on the centerline of the vehicle body, the engine and the throttle body can be connected to the shortest length by the intake pipe substantially, and the intake efficiency is satisfied.

The invention disclosed in claims 17 and 22 is characterized in that the width of the air cleaner in the vehicle body transverse direction is larger than the length of the vehicle body in the longitudinal direction, and the air cleaners are arranged across the vehicle body centerline.

Since an air cleaner having an increased width in the lateral direction of the vehicle body can be arranged between the left and right rear wheels, even if the length of the air cleaner in the vehicle body length direction is reduced, the capacity of the air cleaner can be easily ensured.

The invention disclosed in claims 18 and 23 is characterized in that the oscillating tricycle comprises an intake system for the engine, and the intake system comprises an intake duct structure for the air cleaner. In the inlet of the air cleaner, a first duct part opened upward and extending downward, a second duct part connected downward and extending downward, and an opening at one end communicates with the upper end of the second duct part. And a third duct part in which the other end is in communication with the dirty side of the air cleaner. The third duct part extends over the second duct part and opens to the top of the air cleaner.

Since the first duct part and the second duct part extend downward, and the opening of the third duct part communicates with the upper end of the second duct part, the outside air taken in from the opening of the first duct part is the first duct. It flows downward from the part into the second duct part, becomes a U-turn from the second duct part to the third duct part, and outside air flows upward.

Here, water droplets and dust contained in the intake air in the second duct part fall to the second duct part, are removed from the air, and almost air from the upper end of the second duct part through the third duct part to the dirty side of the air cleaner. Only flows.

In addition, since the first duct part and the second duct part extend downward, the space occupied in the horizontal direction by the first duct part and the second duct part can be reduced and the purification space of the air cleaner can be increased.

The invention disclosed in claims 19 and 24 is characterized in that at least one of the first duct part, the second duct part, and the third duct part is provided at a corner of the air cleaner case, and the cross section is triangular.

Referring to the accompanying drawings, preferred embodiments of the present invention will be described below. The drawings should be viewed in the direction of reference numerals.

1 is a side view showing a rocking tricycle (first embodiment) according to the present invention, the rocking tricycle so that the rear vehicle body 18 can rotate transversely with respect to the front vehicle body 14 and shake vertically ( 10 is a front vehicle body 14 provided with a handlebar 12 for steering one front wheel 11 and a seat 13 for rider seating, a pair of left and right rear wheels 16 and 16 and these It is a vehicle obtained by connecting the rear body 18 provided with the power unit 17 for driving the rear wheels 16 and 16 via the swinging mechanism 21.

In the front vehicle body 14, the front cover 23 is provided in front of the handlebar 12, and the windscreen 26 provided with the wiper 24 is attached to the upper part of the front cover 23, and the step floor ( 27 is installed below the handlebar 12 and the seat 13, and a pair of left and right posts 28, 28 (only one reference numeral 28 is shown) is located at the rear side of the seat 13. Standing from above, a roof 31 is provided between the wind screen 26 and each post 28, 28, and a cargo room 32 is arranged behind the seat 13. Reference numeral 35 designates a front fender covering the top of the front wheel 11, 36 designates a rear view mirror, 37 designates a headlamp, 38 designates a fuel tank installed under the seat 13, 41 indicates a fuel pump installed in the fuel tank 38 and 42 indicates a cushion unit arranged between the front body 14 and the body frame on the side of the swing mechanism 21.

In the rear body 18, an intake system 51 and an exhaust system 52 are connected to the power unit 17, and the power unit 17, the intake system 51, the exhaust system 52, other functional parts, And a cover 53 in which the rear wheels 16 and 16 are integrated.

The swinging mechanism 21 includes: a link 55 of which one end is attached to the lower portion of the vehicle body frame of the front vehicle body 14 so that the link is rotated in the longitudinal direction; And a joint case 57 at which the front end is attached to the other end of the link 55 so that the joint case 57 can be rotated, and the rear end is attached to the power unit 17 of the rear vehicle body 18 through the bracket 56. (57).

Joint case 57 includes: case body 61; A joint shaft 62 rotatably inserted in the case body 61 and having a rear end attached to the side of the power unit 17; And a damping component 63 interposed between the case body 61 and the joint shaft 62.

The damping component 63 is interposed between the joint shaft 62 and the plurality of pressing members radially extending from the case body 61 with a plurality of cylindrical rubbers and a relative rotation between the pressing member and the case body 61. Is a so-called Niedhart damper for creating a damping action by compressing the rubber.

Fig. 2 is a side view (partial cross-sectional view) showing a rear vehicle body of the rocking tricycle (first embodiment) according to the present invention, and a bolt (on the joint shaft 62 where the bracket 56 forms the rocking mechanism 61). 66, 66, cylinder head 68 where the lower portion of power unit 17 is attached to bracket 56 with bolts 67, 67, and intake system 51 forms power unit 17. Is attached to the top of the exhaust system 52, the exhaust system 52 is attached to the bottom of the cylinder head 68, and a stay member 71 for supporting the cover 53 is attached to the top of the power unit 17. . The arrow (front) in FIG. 2 shows the front side of the vehicle (hereinafter similar). Reference numeral 73 in FIG. 2 designates a radiator arranged on the right side of the power unit 17.

The power unit 17 includes an engine 76 and a continuously variable transmission 77 integrally connected to the engine 76, and rotation of the crankshaft 81 transmitted to the drive shaft 83 through the belt 82 is Then, it is transmitted from the drive shaft 83 to the output shaft 84 through a gear (not shown), and drives the left and right rear wheels 16 and 16 (see FIG. 1) attached to the output shaft 84. Reference numeral 86 designates a head cover, 87 designates a cylinder block, and 88 designates a transmission case.

An intake pipe 85 to which a fuel injection valve 91 for injecting fuel in the intake passage is fixed is attached to the cylinder head 68, made of resin, and fuel pump of the fuel tank 38 (see FIG. 1). A fuel hose 92 extending from 41 (see FIG. 1) is connected to fuel injection valve 91.

The cylinder block 87, the cylinder head 68 and the head cover 86 described above respectively form the cylinder portion 93 of the engine 76, and the cylinder portion 93 is inclined forward in a substantially horizontal direction. have.

The intake system 51 includes an intake pipe 95, a throttle body 96 connected to an end of the intake pipe 95, a connection tube 97 connected to a side of an inlet of the throttle body 96, and a connection tube 97. A throttle body 96 and an air cleaner 98 are both located above the power unit 17 and the air cleaner 98 is supported by the stay member 71. do. Reference numeral 101 denotes a throttle cable extending from the throttle grip (see FIG. 1) on the side of the handlebar 12 to open and close the throttle valve installed in the throttle body 96.

The exhaust system 52 includes: one end is attached to the bottom of the cylinder head 68 with bolts 104 and 104 and nuts 105 and 105 and is substantially upward on the left side of the cylinder head 68. An extended front exhaust pipe 106; A catalyst chamber 107 connected to the other end of the front exhaust pipe 106 and extending toward the rear, slightly inclined downward toward the rear; A rear exhaust pipe 108 connected to the rear of the catalyst chamber 107 and extending obliquely downward and towards the rear; A muffler 111 connected to the rear end of the rear exhaust pipe 108; And tail pipe 112 extending obliquely downward and backward from muffler 111. The muffler 111 is arranged at a lower position than the catalyst chamber 107, and the muffler 111 is attached to the protrusion 88a protruding from the transmission case 88 through the bracket 114.

Since the front exhaust pipe 106 extends substantially upward from the bottom of the cylinder head 68, the section between the rear exhaust pipe 108 and the portion attached to the cylinder head 68 of the front exhaust pipe 106. When considered as one exhaust pipe, the catalyst chamber 107 extends substantially horizontally towards the rear, and the rear exhaust pipe 108 extends obliquely downward and towards the rear, and the entirety of one exhaust pipe. The length, ie the length of the exhaust pipe, can further extend in limited space inside the cover 53 of the rear body 18.

The stay member 71 includes a stay body 117 attached to and raised from the power unit 17, a frame member 118 attached to an upper end of the stay body 117, and a bracket attached to the frame member 118 ( And a cover supporting 121).

The stay body 117 includes a front stay 124, 125 and a rear stay 127, which is located between the air cleaner 98 and the muffler 111 and created in the muffler 111. It is a member to which a thermal insulator 128 is attached to insulate the next heat so that the heated heat is not transferred to the air cleaner 98 and others.

The cover for supporting the bracket 121 includes a pair of left and right front brackets 131 and 131 (only one reference numeral 131 is shown) provided at the front, and a pair of left and right rear brackets 132 and 132 provided at the rear. (Only one reference numeral 132 is shown), and an integral cover 53 is attached to the bolt 133 via rubber.

The cover 53 includes a front opening 136 in which the side of the head cover 86 faces the front of the vehicle body from the front, a ventilation hole 137 having a labyrinth structure at the top to vent the cover 53, and It is a member provided with the rear opening part 138 at the back.

The component parts of the intake system 51, the component parts of the exhaust system 52, and the fuel injection valve 91 are functional parts, and these functional parts and the power unit 17 (that is, the engine 76 and the continuously variable transmission ( 77) forms a drive part 130 for driving the rear wheels 16, 16.

As described above, in the present invention, the rear body 18 connected to the rear side of the front body 14 is attached to the front body 14 so that the rear body can swing laterally, and the rear body 18 is An oscillating tricycle, covered with an integral cover 53 and provided with an engine 76, rear wheels 16, 16 driven by the engine 76, and an exhaust system 52 of the engine 76. Based on (10), the cylinder portion 93 of the engine 76 is arranged inside the cover 53 in an inclined state toward the front, and the catalyst pipe 107 and the noise for purifying exhaust gas as the catalyst chamber. A seal muffler 111 is installed in the exhaust system 52, and a fuel injection valve 91 and a throttle body 96 for supplying fuel to the engine 76 are arranged inside the cover 53.

Here, the space above the engine 76 can be efficiently used by the inclination toward the front of the cylinder portion 93. The fuel injection valve 91 and the throttle body 96 can accurately control the amount of fuel and air supplied to the combustion chamber of the engine 76, and the exhaust gas can be made cleaner by the catalyst pipe 107. Since the engine 76, the rear wheels 16 and 16, the catalyst pipe 107, the muffler 111, the fuel injection valve 91 and the throttle body 96 are located inside the integrated cover 53, Each component described can be efficiently and collectively protected and the appearance can be improved.

In addition, as described above, in the present invention, the case 170 includes a catalyst pipe 107 containing a catalyst for purifying exhaust gas emitted from the engine 76, and a muffler 111 for absorbing exhaust noise. And based on the exhaust system 52 of the oscillating tricycle as a downsized vehicle housed separately in a case 190 separate from the case 170, the catalyst pipe 107 is arranged above the engine 76, The muffler 111 is characterized in that it is arranged behind the engine 76 and below the catalyst pipe 107.

Since the catalyst pipe 107 is arranged above the engine 76, the upper space 155 of the engine can be used efficiently.

In addition, since the case 170 of the catalyst pipe 107 and the case 190 of the muffler 111 are separated, in order to communicate the catalyst pipe 107 and the muffler 111 with each other, they are extended from the engine 76. The overall length of the exhaust pipe can be further extended, and the length of the exhaust pipe can be easily secured.

In addition, arranging the muffler 111 behind the engine 76 and below the catalyst pipe 107 can extend the exhaust pipe and ensure the length of the exhaust pipe.

In addition, since the position of the muffler 111 is lowered, the shape of the rear of the vehicle body can be compressed, the rear of the vehicle body can be downsized, and the center of gravity of the vehicle body can be lowered by lowering the position of the relatively heavy muffler 111. Can be.

In addition, the present invention is characterized in that the catalyst pipe 107 is provided inside the integrated cover 53 for covering the upper sides of the left and right rear wheels 16 and 16.

The catalyst pipe 107 is covered with the cover 53, and the quality of the appearance of the rear body 16 can be improved.

Fig. 3 is a plan view showing the main part of the oscillating tricycle (first embodiment) according to the present invention, by arranging the power units 17 between the left and right rear wheels 16 and 16; By arranging the throttle body 96 forming the intake system 51 on the centerline 140 of the vehicle body extending in the vehicle body longitudinal direction; By arranging the air cleaner 98 behind the throttle body 96; By extending the catalyst pipe 107 forming the exhaust system 52 in the longitudinal direction of the vehicle body; By extending the muffler 111 in the width direction of the vehicle body, the longitudinal direction of the catalyst pipe 107 and the longitudinal direction of the muffler 111 are arranged perpendicularly. Reference numerals 141A and 141B indicate respective axes of the rear wheels 16 and 16 and these axes 141A and 141B are connected to each other through a differential mechanism (not shown).

The throttle body 96 is connected to the rear end of the intake pipe 95 extending rearward from the cylinder head 68.

The air cleaner 98 is attached to the rear of the beam-shaped frame member 118 with bolts 142 at three positions, which are shorter in the longitudinal direction of the vehicle body and longer in the width direction of the vehicle body when the air cleaner is viewed from above. The rectangular air cleaner case 143 forming the air cleaner 98 is separated by the bulkhead 144 into the purging chamber 147 and the triangular duct chamber 146 when viewed from above, and the triangular inlet 148 is ducted. An upper duct 151 is installed on the upper wall of the chamber 146 and an upper duct 151 for communicating the duct chamber 146 and the purifying chamber 147 with each other is installed on the upper wall of the air cleaner case 143. S1 in FIG. 3 shows the width of the air cleaner 98 in the transverse direction of the vehicle body, S2 shows the length of the air cleaner 98 in the longitudinal direction of the vehicle body, and S1> S2. Reference numeral 152 denotes an extended part that is integral with the connecting tube 97, the extended part being a part arranged in the purification chamber 147.

The catalyst pipe 107 and the muffler 111 form both sides of the rectangular space 155.

Since the space 155 is rectangular, a larger area can be obtained between the rear wheels 16, 16, the throttle body 96, the air cleaner 98 and many other functional parts (fuel injection valve 91, Electronic units and batteries (not shown) may be arranged systematically close to the space 155, may be compact, and the space 155 may be effectively used.

The frame member 118 includes: a front frame 161 extending in the width direction of the vehicle body and transversely above the front end of the catalyst pipe 107; A rear frame 162 arranged behind the front frame 161 and parallel to the front frame 161; A left frame 163 connected to the inside of the vehicle body from the left end of the front frame 161 so that the left frame is orthogonal to the front frame 161 and the rear frame 162; And a right frame 164 connected to the front frame 161 and the rear frame 162 on the right side of the left frame 163 so that the right frame is parallel to the left frame 163. The air cleaner 98 is attached to the left frame 163 and the right frame 164.

The rear frame 162 is substantially a member supported by the V type rear stay 127.

The radiator 73 is attached to the right front of the transmission case 88 and the cylinder block 87 through a case cover (not shown), and protrudes from the side of the cylinder block 87 to the front of the right rear wheel 16. Reference numeral 73a denotes a radiator cap.

The cover 53, shown by the dashed line, covers the top of each of the power unit 17, the intake system 51, the exhaust system 52, the rear wheels 16, 16, the stay member 71 and the radiator 73. The louver 166 is installed to receive the wind flowing inside the cover 53 and to contact the wind flowing on the radiator 73 in particular in front of the radiator 73.

The fuel hose 92 extends obliquely back and to the right from the fuel pump 41 over the fuel tank 38 and further extends toward the front of the vehicle body below the fuel tank 38, to the U-turn and to the rear. It is a member which approaches to the side of the swinging mechanism 21 (refer FIG. 1) after extension and is connected to the fuel injection valve 91 which extends rearward along the swinging mechanism 21 and is installed in the intake pipe 95. Since the fuel hose is made of a narrow diameter resin and elastically deformed, the performance of the assembly of the oscillating tricycle can be improved, and the fuel hose can follow the up and down of the vehicle body. Reference numeral 168 denotes a filler cap of the fuel tank 38.

As described with respect to FIGS. 1 and 3, the invention is characterized in that the radiator 73 is arranged inside the cover 53.

Since the radiator 73 is arranged inside the cover 53, the engine 76 arranged inside the cover 53 blows air to the radiator 73, whereby the heat of the coolant is caused by the radiator 73 to air. Cooling performance can be effectively cooled by the coolant to be radiated into the furnace, cooling performance of the engine 76 can be improved, and the rear vehicle can be made compact. In addition, since the radiator 73 can be arranged near the engine 76, the radiator 73 and the radiator hose 203 (see FIG. 4) connected to the engine 76 can be shortened with each other and the cost can be reduced. Can be.

In addition, for example, when the louver 166 is installed in the cover 53 in front of the radiator 73, the louver 166 of the cover 53 is arranged at an appropriate angle with the longitudinal axis of the vehicle body, By directing each opening slightly downward from horizontality and arranging the louver boards vertically, fast air flow at the bottom of the vehicle body can be guided efficiently.

In addition, the present invention is based on a rocking tricycle 10 to which a rear vehicle body 18 connected to the rear side of the front vehicle body 14 is attached to the front vehicle body so that the rear vehicle can swing laterally with respect to the front vehicle body 14. do. According to the present invention, the engine 76 for driving the rear wheels 16 and 16 and the functional parts provided above the engine 76 are arranged in the rear vehicle body 18, and the functional parts (that is, the throttle body 96). Since the stay and stay member 71 are arranged so that the air cleaner 98, the catalyst pipe 107 and the muffler 111 are partitioned when viewed from above, the cover 53 and a plurality of covers 53 for covering the engine 76 are arranged. It is characterized in that the functional part is fixed to the engine 76 by the stay member 71.

The cover 53 can be reliably and easily attached to the stay member 71 supported by the engine 76, for example, an air cleaner 98 of an upsize configuration is directly attached to the engine 76. Compared to the case of the air cleaner, it can be attached to the stay member 71 more stably. As described above, not only the cover 53 but also each functional part can be attached to the stay member 71, each functional part can be arranged efficiently, and the rear body 18 can be compact, and each The functional parts can be arranged efficiently and systematically.

Moreover, this invention functions as a functional component which forms the exhaust system 52 of the engine 76, and each catalyst pipe 107 and muffler 111, and the function which forms the intake system 51 of the engine 76 is made. Each air cleaner 98 and the throttle body 96 as parts are partitioned off by the stay member 71.

The stay member 71 is an intake system 51 including respective catalyst pipes 107 and mufflers 111, air cleaners 98 and throttle bodies 96, which are installed in the exhaust system 52, when viewed from above. ). The catalyst pipe 107, the muffler 111, the air cleaner 98 and the throttle body 96 can be functionally and systematically arranged, and the heat generated in the exhaust system 52, such as the muffler 111, A thermal insulator 128 (see FIG. 2) can be easily attached to the stay member 71 to prevent delivery to the intake system 51, such as cleaner 98.

In addition, as described above, in the present invention, the catalyst pipe 107 and the muffler 111 are arranged so that each longitudinal direction of the catalyst pipe 107 and the muffler 111 is orthogonal, and the engine ( A space 155 that forms an intake system 51 of 76 and comprises components including air cleaners 98 and a throttle body 96 on both sides by a muffler 111 and a catalyst pipe 107. Characterized in that arranged.

One of the catalyst pipe 107 or the muffler 111 is secured while ensuring the total length of the exhaust system 52 by the muffler 111 and the catalyst pipe 107 formed by the individual cases 170 and 190, respectively. The length in the longitudinal direction of the exhaust system 52 can be limited by arranging their longitudinal directions to extend in the longitudinal direction of the vehicle, and arranging the others in their longitudinal directions, for example in the vehicle body width direction.

In addition, because of the rectangular space having the catalyst pipe 107 and the muffler 111, which can be on both sides, the area of the rectangular space can be expanded, and the functional parts can be efficiently arranged in the rectangular space, and can be compact. have.

 In addition, the present invention, the catalyst pipe 107 for receiving the catalyst for purifying the exhaust gas emitted from the engine 76 and the muffler 111 for absorbing the exhaust noise is accommodated in the separate cases (170, 190) It is based on the exhaust system 52 of the oscillating tricycle, and is characterized in that the catalyst pipe 107 is provided between a pair of left and right rear wheels 16 and 16 driven by the engine 76.

Since the catalyst pipe 107 is installed between the pair of left and right rear wheels 16 and 16 driven by the engine 76, the space 155 between the left and right rear wheels 16 and 16 can be effectively used.

1 and 3, in the present invention, the engine 76 and the pair of left and right rear wheels 16 and 16 driven by the engine 76 are rocked integrally with the front vehicle body 14. Based on the intake system configuration of the oscillating tricycle 10. In the present invention, the cylinder portion 93 inclined forward is provided in the engine 76, and the air cleaner 98 forming the intake system of the engine 76 is injected between the left and right rear wheels 16 and 16. The valve 91 is characterized in that it is located behind the throttle body 96 for adjusting the intake air flow of the fuel supply system installed.

The fuel injection valve 91 is arranged over the inclined cylinder portion 93, and the throttle body 96 for regulating the intake air flow of the fuel supply system in which the fuel injection valve 91 is installed saves fuel and As installed to purify exhaust gas. Space can be used effectively.

In addition, by arranging the air cleaner 98 between the left and right rear wheels 16 and 16, the capacity of the air cleaner 98 can be increased, and the air cleaner 98 also allows the engine 76 to be in the width direction of the vehicle body. By arranging the air cleaner 98 behind the throttle body 96 which is positioned substantially at the center, the air cleaner 98 can be arranged at the center substantially in the width direction of the vehicle body, and the intake noise of the air cleaner 98 is hardly leaked outside the vehicle body. Do not.

The space between the rear wheels 16, 16 can also be used effectively behind the throttle body 96.

The present invention is also characterized in that the throttle body 96 and the fuel injection valve 91 are arranged on the centerline 140 of the vehicle body extending in the longitudinal direction of the vehicle body.

Since the throttle body 96 is arranged on the centerline 140 of the vehicle body, when the engine 76 is arranged in the center of the vehicle body, the intake pipe 95 for connecting the engine 76 and the throttle body 96 to each other ) Length can be reduced and the intake efficiency can be improved.

Further, the present invention is characterized in that the width S1 in the vehicle body transverse direction of the air cleaner 98 is larger than the length S2 in the longitudinal direction of the vehicle body, and is arranged across the centerline 140 of the vehicle body. It is done.

Here, the width S1 in the vehicle body transverse direction of the air cleaner 98 can be increased between the left and right rear wheels 16 and 16 and the capacity of the air cleaner 98 can be easily ensured. In addition, the length S2 in the vehicle body longitudinal direction of the air cleaner 98 can be reduced and the air cleaner 98 can be made compact in the rear vehicle body 18.

4 is a side view for explaining the arrangement of the radiators according to the present invention and shows the right side of the engine 76.

The radiator 73 includes an upper tank 195, a lower tank 196, and a radiator core 197 having a range from the upper tank 195 to the lower tank 196, and the upper tank 195 and the lower tank. Reference numeral 196 is attached to the case cover 198, and the case cover 198 is a member attached across the right side of the cylinder block 87 and the right side of the transmission case 88. Reference numeral 201 denotes a coolant inflow pipe installed in the upper tank 195, 202 denotes a coolant outlet pipe installed in the lower tank 196, and 203 denotes a water jacket side and an inlet pipe (in the engine 76). Instruct the radiator hose to connect 201).

FIG. 5 is a view seen from arrow 5 in FIG. 4, wherein the mounting parts 205 are installed on the left and right sides of the upper tank 195 of the radiator 73 and below the lower tank 196, and these mounting parts 205 are provided. ) Is attached to the case cover 198 with bolts 206. Reference numeral 198a designates a fitting surface for attaching the case cover 198 to the cylinder block 87 (see FIG. 4) and the transmission case 88 (see FIG. 4), and 198b designates the case cover 198 to the cylinder. Bolt insertion holes for attaching to the block 87 and the transmission case 88 are indicated.

Fig. 6 is a side view (partial section view) showing the radiator and the louver according to the present invention, wherein the louver 166, which is a separate member from the cover 53, is the front wall 53a of the cover 53 in front of the radiator 73. It is shown to be installed in.

With respect to the louver 166, the plurality of louver boards are disposed at substantially equal intervals along the front wall 53a at the opening 53b provided in the front wall 53a, and each front end 166a is horizontally aligned 210. The angle is slightly inclined at the angle θ, and the longer side extends in the width direction of the vehicle body.

As explained above, by directing each louver board 166 slightly downward from the horizon and placing each louver board vertically, fast air flow at the bottom of the vehicle body can be efficiently led as shown by the arrows.

In this embodiment, as shown in FIG. 2, the thermal insulator 128 is provided between the air cleaner 98 and the muffler 111, but in FIG. 3, the thermal insulator is the left frame of the frame member 118. 163, and may also be disposed between the air cleaner 98 and the catalyst pipe 107.

FIG. 7 is a cross-sectional view taken along the line 7-7 of FIG. 3 and illustrating the first embodiment, wherein the catalyst pipe 107 is an inner cylinder 171 and a space 172 connected to the front exhaust pipe 106. The outer cylinder 173 covers the outer circumference of the inner cylinder 171, and end connecting members 174 and 176 for connecting the respective ends of the inner cylinder 171 and the outer cylinder 173. The outer cylinder 173 and the end connecting members 174 and 176 described above are members for forming the case 170.

The inner cylinder 171 has a honeycomb structure (part shown by cross hatching in FIG. 7) therein and the amount of the catalyst support part 177 and the catalyst support part 177 that support the catalyst by attaching the catalyst to the surface of the honeycomb. A rear pipe 181 and a front pipe 178 attached to the side.

The front pipe 178 is connected to the front exhaust pipe 106 and the rear pipe 181 is connected to the rear exhaust pipe 108. The rear pipe 181 is provided with the cylinder part 181a of small diameter, and the some ventilation hole 181b is made in the surface of the cylinder part 181a of small diameter.

The end connecting member 176 is provided with a plurality of ventilation holes 176a.

The rear exhaust pipe 108 is formed by a double pipe having an inner pipe 183 and an outer pipe 184, the inner pipe 183 is connected to the rear pipe 181 of the catalyst pipe 107, and the outer The pipe 184 is connected around the end connecting member 176. Reference numeral 186 denotes an end pipe installed in the outer pipe 184, and 187 indicates an exhaust passage of the exhaust gas formed between the inner pipe 183 and the outer pipe 184.

8 is a cross-sectional view taken along 8-8 indicated in FIG. 2, showing a first embodiment. 8 shows, in the muffler 111, by attaching the cap 192 and the cap 193 to both ends of the cylinder portion 191 formed by the double pipe, and the cylinder portion 191 and the caps 192 and 193. The space surrounded by the bulkheads 194 and 596 is divided into a first chamber 597 formed at the center, a second chamber 598 formed at both ends of the first chamber 597, and a third chamber, respectively. 199 is formed. 8 shows, respectively: by connecting one end of the L type pipe 502 to the cap 193; By penetrating the L-type pipe 502 into the bulkhead 596; By arranging the other end of the L-type pipe 502 in the first chamber 597; By attaching the L type pipe 502 to the partition 596 so that one end of the first communication pipe 503 is closed; By penetrating the first communication pipe 503 into the bulkhead 194; The first communication pipe 503 arranges the other end in the second chamber 198; By penetrating the second communication pipe 204 into the two bulkheads 194, 196, one end of the second communication pipe 204 is arranged in the second chamber 598, and the The other end is arranged in the third chamber 199. FIG. 8 further shows that the third chamber 199 passes outwardly by penetrating the tail pipe 112 into the cap 193, with the end of the outer pipe 184 of the rear exhaust pipe 108 being the third chamber. It is arranged at (199). The cylinder portion 191 and the caps 192 and 193 are members forming the case 190.

The cylinder portion 191 includes: an inner cylinder 506 to which each bulkhead 194 and 596 is attached; An end pipe 207 attached to one end of the inner cylinder 206 attaching the cap 192; An outer cylinder 208 attached to the end pipe 207 and the other end of the inner cylinder 506; Bracket 114 attached to the side of the outer cylinder 208. Glass wool is formed on the light layer 210 formed between the inner cylinder 506, the end pipe 207, and the outer cylinder 208 as a perforated plate on a plurality of perforated surfaces. ) Improves the noise absorption effect by the next lighter layer 210 and prevents heat in the muffler 111 from being transferred to the outer cylinder 208.

The first communication pipe 503 is a member in which a plurality of ventilation holes 203a through which exhaust gas passes are formed.

The flow of exhaust gases in the catalyst pipe 107 and the muffler 111 described above, respectively, will be described below.

9A and 9B show respective behaviors of the flow of exhaust gas in the muffler and catalyst pipes according to the first embodiment of the present invention.

For the catalyst pipe 107 shown in FIG. 9A, as shown by arrow A, the exhaust gas flowing in the front exhaust pipe 106 from the engine side passes through the catalyst support component 177 through the small diameter cylinder portion 181a. ) (See arrow B) to the inner pipe 183 (see arrows C and D) and through the ventilation holes 181b (see arrow E), space 172 and ventilation holes 176a (see arrow F) It flows from the small diameter cylinder part 181a to the exhaust passage 187 (refer arrow G).

With respect to the muffler 111 shown in FIG. 9B, as shown by arrow H, the exhaust gas flowing in the inner pipe 183 of the rear exhaust pipe 108 from the side of the catalyst pipe is sequentially in the first chamber. 597 (see arrow K), ventilation holes 203a (see arrow M), first communication pipe 503 (see arrow N), second chamber 598 (see arrow P), second communication pipe ( 204 (see arrow Q), third chamber 199 (see arrow R) and tail pipe 112 (see arrow S) to out of muffler 111 from L type pipe 502 (see arrow J) Flow. The exhaust gas flowing in the exhaust passage 187 of the rear exhaust pipe 108 from the side of the catalyst pipe shown by arrow T flows from the third chamber 199 to the tail pipe 112 (see arrow U).

In the rear exhaust pipe 108 the inner pipe 183 functions as a first path (main path) of the exhaust gas and the exhaust passage 187 functions as a second path (other path) of the exhaust gas.

Fig. 10 is a side view (partial cross-sectional view) showing a rear vehicle body of a swinging tricycle (second embodiment) according to the present invention, and Fig. 11 shows a main part of the swinging tricycle (second embodiment) according to the present invention. It is a top view, and FIG. 12 is a front view which shows the rear vehicle body of the oscillation tricycle (2nd Example) which concerns on this invention. Reference numerals are assigned to the same shapes in the first embodiment shown in Figs. 1 to 9, and their detailed descriptions are omitted.

As shown in FIG. 10, the swing tricycle 220 has an exhaust system 221 attached to the lower side of the cylinder head 68, and exhausts secondary air for oxidizing CO and HC in the exhaust system 221. A secondary air supply system 222 for supplying 221 is installed between the air cleaner 98 of the intake system 51 and the exhaust system 221.

Exhaust system 221 includes: a front exhaust pipe attached to the bottom of cylinder head 68 with bolts 104 and 104 and nuts 105 and 105 and extending substantially up along the left side of cylinder head 68. (225); A first catalyst pipe 226 connected to the other end of the front exhaust pipe 225 and extending substantially upward; An intermediate exhaust pipe 227 connected to the top of the first catalyst pipe 226 and extending substantially up and then down; A second catalyst pipe 227 connected to the rear end of the intermediate exhaust pipe 227 and extending back; A rear exhaust pipe 229 connected to the rear of the second catalyst pipe 228 and extending back, then back and obliquely downward; A muffler 111 connected to the rear end of the rear exhaust pipe 229; And tail pipe 112.

The first catalyst pipe 226 receives a reduction catalyst and reduces NOx by the reduction catalyst. The second catalyst pipe 228 receives the oxidation catalyst and accelerates the oxidation of CO and HC by the oxidation catalyst.

11 shows that the first catalyst pipe 226, the intermediate exhaust pipe 227, the second catalyst pipe 228 and the rear exhaust pipe 229 are arranged in a straight line in the longitudinal direction of the vehicle, and the first catalyst pipe 226 ) Is arranged on the left side of the cylinder head 68 and the second catalyst pipe 228 is arranged on the left side of the throttle body 96.

Secondary air supply system 222 includes: a first hose 232, one end of which is connected to purging chamber 147 of air cleaner 98; A solenoid valve 233 connected to the other end of the first hose 232; A second hose 234, one end of which is connected to the solenoid valve 233; A lead valve 236 as a check valve connected to the other end of the second hose 234; And a metal pipe 237 connected at one end to the reed valve 236 and at the other end to the intermediate exhaust pipe 227.

When the solenoid valve 233 is opened in accordance with a signal from an engine control unit (not shown), if the intermediate exhaust pipe 237 is turned under negative pressure by the exhaust pulse, the reed valve 236 is also opened, With the air pulled toward the negative pressure, air is supplied into the exhaust system 221 through the secondary air supply system 222 in the purging chamber 147 of the air cleaner 98.

12 shows that the front exhaust pipe 225 extends from the bottom of the cylinder head 68 to a first catalyst pipe 226 positioned next to the cylinder head 68 in a substantially U-shape, An end of the transversely extending second hose 234 is connected to a reed valve 236 located substantially next to the front exhaust pipe 225, with the metal pipe passing through the bottom of the intermediate exhaust pipe 237. A metal pipe 237 is connected from the reed valve 236 to the inner surface of the intermediate exhaust pipe 227 to make a turn.

In the second embodiment, a downsized vehicle equipped with a compact and efficient exhaust emission control device in which the volume of one catalyst chamber is reduced is obtained with a relatively low cost catalyst.

As shown in FIGS. 7 and 8, the present invention provides a muffler 111 having a catalyst pipe 107 containing a catalyst for purifying exhaust gas of the engine 76 and a multiple chamber for absorbing exhaust noise. Paths are provided on the basis of the oscillating tricycle 52 accommodated in the individual cases 170 and 190, and for guiding the exhaust gas discharged from the catalyst pipe 107 to the muffler 111. The outer main path (i.e., the exhaust passage in the inner pipe 183) is opened to the first chamber 197 on the upstream side of the muffler 111, and the other path (i.e., the exhaust passage 187) is the muffler ( It is characterized in that it is open to the third chamber 199 on the downstream side of the first chamber 197 on the most upstream side of 111.

The cross-sectional area of the exhaust gas can be extended by a plurality of paths for guiding the exhaust gas discharged from the catalyst pipe 107 to the muffler 111, the resistance of the exhaust gas can be reduced, and the required output characteristics can be easily made. Can be obtained, and the performance of purifying exhaust gas and noise absorption performance can be guaranteed.

The present invention is also characterized in that the rear exhaust pipe 108 is formed as a multiple pipe as a connecting pipe for connecting the muffler 111 and the catalyst pipe 107, and a plurality of passages in the multiple pipe form a plurality of paths. It is done.

Since the rear exhaust pipe 108 is formed as multiple pipes, the path of the exhaust gas can be compact, and the catalyst pipe 107 and the muffler 111 can be reliably connected.

In the present invention, the catalyst chamber is arranged above the engine, but the present invention is not limited to this, and as shown in FIG. 2, the catalyst chamber extends upward from the lower side of the cylinder head 68. 106 may be arranged, i.e., the catalyst chamber may be arranged next to the engine 76, and more particularly, next to the cylinder head 68. Here, the catalyst chamber is arranged near the cylinder head 68, so that the catalyst temperature is higher, and the catalytic reaction can be accelerated.

13A and 13B are sectional views showing the air cleaner according to the present invention. 13A is a first cross-sectional view illustrating the first duct part and the duct chamber (second duct part). FIG. 13B is a second cross-sectional view (shown in major parts) showing the duct chamber and the third duct part. FIG.

As shown in FIG. 13A, the air cleaner 98 includes an air cleaner case 601, an air cleaner component 602 installed in the air cleaner case 601, and a drain hose attached to a lower portion of the air cleaner case 601. 603).

The air cleaner case 601 includes an air cleaner cover 606 covering the case body 605 and the case body 65, and the air cleaner component at the portion where the case body 605 and the air cleaner cover 606 are fitted. It is fixed by fitting 602.

The case body 605 includes a clean side 608 forming the purging chamber 147, a body 211 of the vertically long duct chamber forming the duct chamber 146, and a body 211 of the duct chamber. A drain pipe 212 installed at the lower end of the flange and a flange 213 installed around the upper end, and the clean side 608 and the body 211 of the duct chamber are separated by the bulkhead 144, A drain hose 603 is attached to the drain pipe 212 by a hose band 215, and a flange 213 is attached to the frame member 118 (see FIG. 3). Reference numeral 213a indicates a bolt insertion hole for inserting a bolt 142 (see FIG. 3) for attaching the air cleaner 98 to the frame member 118.

The air cleaner cover 606 has a dirty side 621 forming a purging chamber 147 and a first duct part extending vertically above the body 211 and the upper wall 217 of the duct chamber. ) Is installed. The duct chamber 146 is formed by closing the upper end of the body 211 of the duct chamber with the upper wall 217 as described above, and outside air is introduced into the duct chamber 146 through the first duct part 218. Inflow.

 The duct chamber 146 is located on the downstream side of the air entering from the first duct part 218. The duct chamber 146 functions as a second duct part. Reference numeral 218a indicates an upper opening component that is opened above the first duct component 218, and reference 218b indicates a lower opening component that opens to the duct chamber 146 of the first duct component 218.

The air cleaner component 602 includes a frame 224 fixed to the air cleaner case 601 and a filter 625 (the same as the portion shown by cross-hatching), and the dirty side 621 of the purging chamber 147. And the clean side 608.

As shown in FIG. 13B, by opening the first through hole 627 in a portion corresponding to the duct chamber 146 of the upper wall 217; By opening the second through hole 628 in a portion corresponding to the dirty side 621 of the upper wall 217; The air cleaner cover 606 is attached by fitting the upper duct 151 into the first through hole 627 and the second through hole 628. The duct chamber 146 and the dirty side 621 are through each other through the upper duct 151. Reference numeral 231a indicates a first opening part that is opened in the duct chamber 146 of the upper duct 151, and reference numeral 231b indicates a second opening part that opens in the dirty side 621 of the upper duct 151. do.

 The first duct part 218, the duct chamber 146, and the upper duct 161 shown in Figs. 13A and 13B, respectively, are parts forming the inlet port 235 of the air cleaner 98. Figs.

As shown in FIGS. 13A and 13B, the present invention relates to an air cleaner 98 that forms an intake system 51 of an engine 76 provided in a swinging tricycle 10 (see FIG. 1) as a downsized vehicle. Based on the intake duct structure, the first duct part 218 opening up and extending downward, the duct chamber 146 and one end of the duct chamber as a second duct part connected to and extending down the first duct part 218. The upper duct 151 as the third duct part in which the opening 151a is opened at the upper end of the duct chamber 146 and the other end is in communication with the dirty side 621 of the air cleaner 98 is the inlet port of the air cleaner 98. And an upper duct 151 extends above the duct chamber 146 and is open to the upper portion of the air cleaner 98.

Dust (or water droplets) 240 (see FIG. 14A) may be more effectively removed from the air entering by the upper duct 151, which communicates with the upper end of the duct chamber 146, and the duct chamber 146 extending downward. Can be. The space occupied by the intake duct structure, the duct chamber 146 and the upper duct 151 formed by the first duct part 218 in the horizontal direction can be reduced, and the air cleaner 98 can be made compact The capacity of the purification space of the air cleaner 98, that is, the purification chamber 147 can be easily ensured.

As shown to FIG. 3, 13A and 13B, at least 1 part of the 1st duct part 218, the duct chamber 146, and the upper duct 151 (in this embodiment, 1st duct part) 218 and the duct chamber 146 are installed at the corners of the air cleaner case 601 and have a triangular cross section.

As described above, by making the cross section triangular, the space at the corners can be effectively used and the air cleaner 98 can be made compact.

Next, the flow of intake air in the air cleaner 98 described above will be described.

14A and 14B show the behavior of the flow of intake air in an air cleaner according to the present invention.

As shown in FIG. 14A, outside air flows downward into the duct chamber 146 from the upper opening part 218a of the first duct part 218, as shown by arrow A. At this time, the dust (or water droplets) 240 included in the outside air falls to the bottom of the duct chamber 146 and, as shown by arrow B, goes outward from the drain hose 603 through the drain pipe 212. Is discharged. At the lower end 203a of the drain hose 603, slits are formed. The slit is normally closed and acts as a check valve to prevent the outside from flowing inside, and if the inside of the air cleaner 98 is positive pressure, dust (or water droplets) is discharged.

As shown in FIG. 14B, the intake air flows up in the duct chamber 146, the dust (or water droplets) 240 (see FIG. 14A) is further removed and the intake air is at the top as shown by arrow C. Flowing into the duct 151, the intake air reaches the dirty side 621, as shown by arrow D, and the intake air passes the filter 625 of the air cleaner component 602, as indicated by arrow E. As it passes, intake air reaches the clean side 608.

The air of the clean side 608 passes through the connecting tube 97 from the elongated part 152 as shown by arrow F in FIG. 14A and reaches the combustion chamber of the engine through the throttle body.

As shown in FIGS. 14A and 14B, the dust (or moisture) 240 included in the intake air can be effectively removed: the duct chamber 146 as the second duct part and the first duct part 218 are vertical. By arranging; By introducing external air from the first duct component 218 down into the duct chamber 146; By opening the first opening 231a of the upper duct 151 at the upper end of the duct chamber 146; By redirecting the flow of intake air from the downward flow to the upward flow by the first duct part 218, the duct chamber 146 and the upper duct 151.

In the present invention, at least one of the first duct part, the second duct part, and the third duct part is triangular, but the present invention is not limited thereto, and the cross section may be a circular, rectangular, or similar shape. will be.

The present invention can be applied to downsized vehicles, motorcycles, rocking tricycles as well as rocking vehicles.

In the invention disclosed in claim 1, the cylinder portion of the engine is inside the cover.

Since it is arranged in an inclined forward direction, a catalyst chamber and a noise chamber for purifying exhaust gas are installed in the exhaust system, and a fuel injection valve and a throttle body for supplying fuel into the engine are arranged inside the cover. And, by inclining the cylinder portion forward, the space above the engine can be effectively used. In addition, the fuel injection valve and the throttle body can accurately control the amount of fuel and air supplied to the engine combustion chamber, and the exhaust gas can be cleaner by the catalyst chamber. Since the engine, the rear wheel, the catalyst chamber, the noise chamber, the fuel injection valve and the throttle body are located inside the integrated cover, each component described above can be efficiently and collectively protected and the appearance can be improved.

In the invention as set forth in claim 2, since the radiator is arranged inside the cover, the engine arranged inside the cover can be efficiently cooled with the coolant, and by blowing wind toward the radiator, the heat of the coolant is removed, Cooling performance can be improved and compact. In addition, the radiator can be brought close to the engine, the radiator hose connecting the radiator and the engine can be shortened, and the cost can be reduced.

Also, for example, when the louver is installed on the cover in front of the radiator, by arranging the louver of the cover at an appropriate angle with the longitudinal axis of the vehicle body, each opening is slightly downward from the horizontal line, and the louver board is vertically aligned. As a result, fast air flow in the lower part of the body can be led efficiently.

In the invention as set forth in claim 3, a plurality of functional parts and an engine installed above the engine are arranged in the rear body, and a cover for covering the plurality of functional parts and the engine is fixed to the engine by a stay, and when viewed from above, Since the stay is arranged so that the parts are partitioned, the cover can be reliably and easily attached to the stay supported by the engine, for example, the air being an upsize functional part, as compared to the case where the air cleaner is directly attached to the engine. The cleaner can be attached to the stay more stably. As described above, not only the cover but also each functional part can be attached to the stay, each functional part can be effectively arranged, the rear body can be compact, and each functional part can be efficiently and systematically arranged.

In the invention disclosed in the above-mentioned item 4, the intake system including the noise chamber and the catalyst chamber installed in the exhaust system, and the air cleaner and the throttle body are partitioned when viewed from above, so that the catalyst chamber, the noise chamber, the air cleaner and the throttle The body can be functionally and systematically arranged, and a thermal insulator can be easily attached to the stay, for example to prevent heat generated in the exhaust system from being transferred to the intake system.

In the inventions disclosed in claims 5 and 10, the catalyst chamber is arranged above the engine, so that the space above the engine can be effectively used.

In addition, since the catalyst chamber and the noise chamber are accommodated in separate cases, the entire length of the exhaust pipe extending from the engine can be extended and the length of the exhaust pipe can be easily secured to communicate the catalyst chamber and the noise chamber with each other.

Further, by arranging the sound chamber behind the engine and below the catalyst chamber, the exhaust pipe can be extended and the length of the exhaust pipe can be ensured.

In addition, the position of the noise chamber can be lowered, so that the external shape of the rear of the vehicle body can be reduced, the rear of the vehicle body can be downsized, and also by lowering the position of the relatively heavy sound chamber, the body weight center can be lowered. Can be.

In the inventions set forth in claims 6 and 11, one of the catalyst chamber or the noise chamber is arranged such that the longitudinal direction extends in the longitudinal direction of the vehicle, and the other, for example, the longitudinal direction thereof extends in the width direction of the vehicle body. By arranging as much as possible, the total length of the exhaust system is ensured by the noise chamber and the catalyst chamber respectively accommodated in the individual cases.

Further, since the rectangular space having both sides of the noise chamber and the catalyst chamber can be formed, the area of the rectangular space can be expanded, and the component parts can be efficiently arranged in the rectangular space and can be compact.

In the inventions set forth in claims 7 and 12, by the plurality of paths for guiding the exhaust gas discharged from the catalyst chamber to the noise chamber, the cross-sectional area of each passage of the exhaust gas can be expanded, and the required output characteristics can be easily obtained. It is possible to secure exhaust purification performance and noise absorption performance.

In the invention disclosed in claims 8 and 13, since the connecting pipe is formed of multiple pipes, the path of the exhaust gas can be made compact, and the catalyst chamber and the noise chamber can be reliably connected.

In the inventions set forth in claims 9 and 14, since the catalyst chamber accommodating the catalyst and the noise chamber for absorbing exhaust noise are accommodated in separate cases, the catalyst chamber is installed between a pair of left and right rear wheels driven by an engine. The space between the left and right rear wheels can be effectively used. In addition, since the catalyst chamber is installed inside the integrated cover covering each upper side of the left and right rear wheels, the catalyst chamber is covered with a cover, and the appearance quality can be improved.

In the invention disclosed in claims 15 and 20, the engine is provided with a cylinder portion inclined toward the front, and the intake air flow of the fuel supply system provided with an air cleaner forming an intake system of the engine between the left and right rear wheels and with a fuel injection valve. Since it is located behind the throttle body for adjusting the fuel injection valve, the fuel injection valve can be arranged over the inclined cylinder portion forward, so that the space can be effectively used, to save fuel and clean the exhaust gas A throttle body for regulating the intake air flow of the fuel supply system is installed.

Further, by arranging the air cleaner between the left and right rear wheels, the capacity of the air cleaner can be increased, and by arranging the air cleaner behind the throttle body located substantially center in the width direction of the engine body, the air cleaner is in the width direction of the vehicle body. It can be arranged in the center substantially, and the intake noise of the air cleaner hardly leaks out of the vehicle body.

In addition, the space between the rear wheels can be effectively used behind the throttle body.

According to the inventions set forth in claims 16 and 21, since the throttle body and the fuel injection valve are arranged on the centerline of the vehicle body extending in the longitudinal direction of the vehicle body, when the engine is arranged in the center of the vehicle body, the engine and the throttle body are connected. The intake pipe can be reduced, and the intake efficiency can be improved.

In the inventions disclosed in Claims 17 and 22, since the width of the air cleaner in the vehicle body transverse direction is larger than the length of the vehicle body in the longitudinal direction, and the air cleaner is arranged across the centerline of the vehicle body, the vehicle cleaner in the vehicle body transverse direction The width of the furnace can be increased between the left and right rear wheels and the volume of the air cleaner can be ensured. In addition, the length of the air cleaner in the vehicle body length direction can be reduced and the air cleaner can be made compact.

In the invention disclosed in claims 18 and 23, by the second duct part extending downward and the third duct part in communication with the upper end of the second duct part, water droplets and dust can be effectively removed from the intaken air. The space occupied in the horizontal direction can be reduced by the intake duct structure including the first duct part, the second duct part and the third duct part, the air cleaner can be made compact, and the capacity of the purification space of the air cleaner is increased. It can be secured easily.

In the inventions disclosed in Claims 19 and 24, since at least one of the first duct part, the second duct part, and the third duct part is installed at the corner of the air cleaner case and the cross section is triangular, the space at the corner is It can be used effectively and the air cleaner can be compact.

Claims (24)

The rear body is connected to the rear side of the front body so that the rear body can swing laterally relative to the front body, the rear body is covered with an integral cover, and the cover is driven by the engine and the engine A part of the rear wheel which is made, and the oscillating tricycle which is arranged to surround the exhaust system of the said engine, A cylinder portion of the engine is arranged inside the cover in an inclined state toward the front; A catalyst chamber for purifying exhaust gas, and a noise chamber are installed in the exhaust system; A fuel injection valve for supplying fuel into the engine, and a throttle body arranged inside the cover. The method according to claim 1, A rocking tricycle, wherein a radiator for cooling the engine is arranged inside the cover. An oscillating tricycle, in which the rear body is connected to the rear side of the front body so that the rear body can swing laterally relative to the front body. An engine for driving a rear wheel and a plurality of functional parts installed above the engine are arranged in the rear body; A cover for covering the engine and the plurality of functional parts is fixed to the engine by a stay; Viewed from above, the swing tricycle is partitioned by the stay. The method according to claim 3, The functional part includes a noise chamber and a catalyst chamber respectively forming an exhaust system of the engine, and an air cleaner and a throttle body respectively forming an intake system of the engine, wherein the catalyst chamber, the noise chamber, an air cleaner, and a throttle A rocking tricycle, wherein the body is partitioned by the stay. The method according to claim 1, Wherein the catalyst chamber and the silencer are housed in separate cases within the exhaust system, the catalyst chamber is arranged above the engine, and the silencer is arranged behind the engine and below the catalyst chamber. The method according to claim 1, The catalyst chamber and the silencer are housed in separate cases within the exhaust system, and when viewed from above, the catalyst chamber and the silencer are arranged such that the respective longitudinal directions of the catalyst chamber and the silencer are orthogonal, and the intake system of the engine A component triangular component, such as a throttle body and an air cleaner, is formed in a space having both sides of the noise chamber and the catalyst chamber. The method according to claim 1, The catalyst chamber and the silencer are housed in separate cases in the exhaust system, and a plurality of paths are provided for guiding the exhaust gas discharged from the catalyst chamber to the silencer, wherein a main path of the silencer is An oscillating tricycle, open to either chamber on the most upstream side and another path to the chamber on the downstream side of either chamber on the upstream side of the silencer. The method according to claim 7, A connecting pipe for connecting the catalyst chamber and the noise chamber is formed of multiple pipes, and the plurality of paths are formed by a plurality of passages of the multiple pipes. The method according to claim 1, The catalyst chamber and the silencer are housed in separate cases in the exhaust system, the catalyst chamber is installed between a pair of left and right rear wheels driven by the engine, and the catalyst chamber covers an upper portion of the left and right rear wheels. Oscillating tricycle installed inside the covered cover. The method according to claim 3, The catalyst chamber and the silencer are housed in separate cases in the exhaust system, the catalyst chamber is arranged above the engine, and the silencer is arranged behind the engine and below the catalyst chamber. tandem. The method according to claim 3, The catalyst chamber and the silencer are housed in separate cases in the exhaust system, and when viewed from above, the catalyst chamber and the silencer are arranged such that the respective longitudinal directions of the catalyst chamber and the silencer are orthogonal, and the intake system of the engine A component triangular component, such as a throttle body and an air cleaner, is formed in an oscillating tricycle, which is arranged in a space having the noise chamber and the catalyst chamber on both sides. The method according to claim 3, The catalyst chamber and the silencer are housed in separate cases in the exhaust system, and a plurality of paths for guiding the exhaust gas discharged from the catalyst chamber to the silencer are provided, the main path of which is the most upstream of the silencer. An oscillating tricycle, open to either chamber on the side and another path open to the chamber on the downstream side of either chamber on the upstream side of the silencer. The method according to claim 12, A connecting pipe for connecting the catalyst chamber and the noise chamber is formed of multiple pipes, and the plurality of paths are formed by a plurality of passages of the multiple pipes. The method according to claim 3, The catalyst chamber and the silencer are housed in separate cases in the exhaust system, the catalyst chamber is installed between a pair of left and right rear wheels driven by the engine, and the catalyst chamber covers an upper portion of the left and right rear wheels. Oscillating tricycle installed inside the covered cover. The method according to claim 1, The vehicle includes an intake system structure for an engine, and an air cleaner forming the intake system structure is between the left and right rear wheels and the throttle body for regulating the intake air flow of a fuel supply system provided with the fuel injection valve. Located behind the, rocking tricycle. The method according to claim 15, And the throttle body and the fuel injection valve are arranged on a body center line extending in the longitudinal direction of the vehicle body. The method according to claim 15 or 16, The swing tricycle of the said air cleaner is larger than the width of the said vehicle body in the longitudinal direction, and the said air cleaner is arrange | positioned across the said vehicle body centerline. The method according to claim 1, The vehicle includes an intake system for an engine, the intake system comprising an intake duct structure of the air cleaner, and at the inlet of the air cleaner, a first duct part open upward and extending downward; A second duct part connected to the first duct part and extending downward, and a third duct part in which an opening at one end thereof communicates with an upper end of the second duct part and the other end is connected to the air cleaner case of the air cleaner And the third duct part extends upwardly from the second duct part and opens into the upper portion of the air cleaner. The method according to claim 18, At least one component of the said 1st duct part, the 2nd duct part, and the 3rd duct part is provided in the corner of an air cleaner case, and the cross section is triangular-shaped tricycle. The method according to claim 3, The vehicle includes an intake system structure for an engine, and the air cleaner forming the intake system structure is arranged between the left and right rear wheels and the throttle for adjusting the intake air flow of the fuel supply system provided with the fuel injection valve. Oscillating tricycle, located behind the body. The method of claim 20, And a throttle body and a fuel injection valve are arranged on a body center line extending in the longitudinal direction of the vehicle body. The method according to claim 20 or 21, A rocking tricycle, wherein the width of the air cleaner in the vehicle body transverse direction is greater than the length of the vehicle body in the longitudinal direction, and the air cleaner is arranged across the body center line. The method according to claim 3, The vehicle includes an intake system for an engine, the intake system comprises an intake duct structure of the air cleaner, and the inlet of the air cleaner comprises: a first duct part extending upward and extending downward; A second duct part connected to the first duct part and extending downward, and a third duct part in which an opening at one end thereof communicates with an upper end of the second duct part and the other end is connected to the air cleaner case of the air cleaner is installed And the third duct part extends upwardly from the second duct part and opens into the upper portion of the air cleaner. The method according to claim 23, At least one of the said 1st duct part, the 2nd duct part, and the 3rd duct part is provided in the corner of an air cleaner case, and the cross section is triangular-shaped tricycle.

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