JPS59186737A - Power unit for vehicle - Google Patents

Abstract

PURPOSE:To improve the cooling effect by providing a cylinder while directing rearward at the rear portion of crank case of power unit for scooter type automatic tri-cycle thereby facilitating collision of wind flowing below the chassis against the cylinder. CONSTITUTION:Single steering front wheel and two driving rear wheels RW are provided, while a power unit 21 is provided between both wheels RW where the rear wheel RW and the upper face of power unit 21 are covered with a cover member 50. The crank case 22 and cylinder 23 of power unit 21 are arranged in front and rear of chassis respectively where the cylinder 23 is arranged while directing rearward of chassis. The upper space of power unit 21 covered with the cover unit 50 is partitioned back and fro by means of a steel partitioner 60 where auxiliary suction units 30 are provided in the front space while an exhaust muffler 40 is provided in the rear space. The auxiliary suction units 30 are provided with an air-cleaner 31 and carburetor 37.

Description

[Detailed Description of the Invention] The arrangement position of the power unit in a vehicle in which the power unit is disposed between the drive rear wheels and the power unit disposed between the drive rear wheels and the upper part thereof covered. Scooter-type tricycles covered with parts are known.

In this type of tricycle, the intake air temperature rises due to the arrangement of the cylinder, which is a high-temperature heating element housed within the cover, the exhaust silencer, and intake auxiliary equipment such as the carburetor and air cleaner. In addition, there is a risk that the cylinder and exhaust muffler may be difficult to receive enough wind vibrations. Also, there is a part of the cover that covers the upper part of the power unit. Hot air is trapped in a, and the intake auxiliary equipment and cover parts are easily affected by the heat.

The present invention was devised against this technical background, and has a front wheel for steering and a rear wheel for driving, and a power unit is disposed between the two rear wheels for driving. In a vehicle whose upper part is covered with a cover material, the cylinder is arranged at the rear of the crankcase in a position facing the rear of the vehicle body, and the intake auxiliary equipment is arranged in front of the space above the power unit, and at the rear thereof. A distinctive feature is the installation of an exhaust silencer.

An object of the present invention is to avoid heating of intake auxiliary equipment due to cylinder noise, and at the same time, to effectively induce running air to the cylinder.

Embodiments of the present invention will be explained below with reference to FIGS. 1 to 9G.

A scooter-type tricycle 1 is composed of a front body 2 and a rear body 20. The front body 2 has a front @FW for steering, and the rear body 20 has a left wheel and a rear wheel for driving. RW is not properly placed.

In the front body 2, similarly to a scooter-type motorcycle, there is a leg shield 4, a step 5, and an upright wall portion 6a located behind the step 5 with respect to the main frame 3.
The rear body force (-6) was affected by several cases, and the seat 7 was installed on the top of the body car (-6).

Also, for the rear vehicle body, the connection mechanism 1 is connected to the main frame 3.
They are connected via 02. This coupling mechanism 10 consists of joint shafts 11 and 12 that are pivotally supported on the main frame 3 so as to be able to swing vertically.
It is composed of a joint case 13 that rotatably supports the joint case 13, and a bracket 13α that connects the joint case 13 to a crankcase (described later) (refer to FIGS. 1 to 3)0 and a rear cushion 15. However, in the rear vehicle body 20 disposed between the main frame 3 and the joint shaft 120, the rear wheels RIE are arranged so as to sandwich the unit swing type power unit 21 from the left and right sides. After power unit 21 and pair @
A resin cover member 50 covers the upper part of RW (third
(See Figure, Army Figure 4).

Furthermore, the crankcase 22 of the power unit 21 is located on the front side of the vehicle body with respect to the cylinder 23, and the bracket of the joint case 13 is connected to the bracket of the joint case 13 by means of a stay 22 (three L) screws 14 protruding from the front part thereof. The cylinder 23 is connected to the crankcase 2.
It is located on the rear side of the vehicle compared to No. 2, and is arranged in an inclined position facing toward the rear of the vehicle. This tilted attitude means that the angle θ between the central axis C of the cylinder B and the horizontal line H is relatively small. The crankcase 722 and the cylinder 23 are sized and shaped to fit within the outline of the stay 22 (excluding a part of the l, when viewed from the side of the vehicle @ RW 17) (Fig. 3). reference).

The general shape of the cooling unit 21 is shown in FIG.
A fan cover 24 is attached to the side of the crankcase 22 to cover a cooling fan pivotally mounted on the crankshaft, and a shroud 26 is screwed onto the crankcase 22 to cover the cylinder 23. The clothes are torn. A duct 25 is attached to the opening 24a of the fan fan ζ-24 (see Figure 41, Figures 5 and 7), and the fan is connected through the duct 25 and the opening 24σ. The cooling air that has been introduced into the cover 24 is
While cooling the cylinder 23, it is discharged from the lower opening of the shroud 26 toward the ground.
(See Figures 3 and 8).

Further, the space above the power unit 21 covered by the cover straddle 1 50 is divided into front and rear by steel plate partition walls 60, and the intake auxiliary equipment 30 is arranged in the front space! t, an exhaust silencer 40 is disposed in the rear space 0 The intake auxiliary equipment 30 refers to the air cleaner 31 and the carburetor 37, and on the left side of the intake auxiliary equipment 30 there is a duct 25.
On the right side of the carburetor 370, there is a side wall 61 that is integrally attached to the right side of the bulkhead 60.
(See Figures 3 to 5 and 7). Also, a partition plate 33 is formed integrally with the air cleaner case 32...This partition plate 33 is connected to a cover member 50. The partition wall 601 together with the side wall 61 and the duct 5 define an intake chamber A4, and the carburetor 37 is located within the re-intake chamber A. 1 suction duct 32 of the air cleaner 31 (L is
The air cleaner coax 32 is integrally removed and opens into the intake chamber A, and when the engine is running, the air in the intake chamber A) S1 intake duct 32 (1''; Air cleaner: 21t intake in 31, Niremen)
After being cleaned by E, it passes through the connecting pipe 36 and the carburetor 37, and is sucked into the crankcase 22 of the two-cycle engine along with gasoline.
(See Figures 3 to 5).

The bulkhead plate 33 is bent toward the front side of the vehicle body at the lower side to form a stay 34, and the air cleaner 31 is attached to the stay of the crankcase 22 through one bracket 35 on the stay 34. It is fixed at 220. Bracket 35 &:t, with the pair of stays 35 CL straddling the stay 22 ct 'ljl, one screw 14 is also fixed to the stay 22a, and the stay 34 is fixed to the opening 35 A with the screw 34 A. ing(
(See Figures 3 and 7).

Furthermore, a small chamber 34α oriented in the longitudinal direction of the vehicle body is formed on the lower surface of the stay 34, and an ignition coil 70 is housed inside the chamber 34α (see FIGS. 3 and 5). 1. The bracket 35 is the air cleaner 31
It not only supports the cover member 50 but also supports the cover member 50.

That is, the stay 54A is protruded from the front end Ms of the cover member 500, and the locking pin 5 attached to the stay 54A
4a is connected to the opening 3 of the bracket 35 through the grommet 55.
5C, and is screwed into the corresponding opening of the bracket 35 with the screw 56 through the grommet 57 at the screw opening 54h (see FIG. 7).

By the way, as mentioned above, the first side wall 61 is attached to the right side of the partition wall 60, but this inner side wall 61 also extends to the exhaust muffler 40 side and is attached to the right side of the exhaust muffler 40. and corresponding to the rearward extension of the side wall 61, the bulkhead 60
A side wall 62 is attached to the left side of the stone. And the bulkhead 60・
A heat shield plate 63 made of a steel plate is screwed to the upper side of the left and right side walls 61 and 62. (See Figures 3, 4, 6, and 7).

Note that there is a bent portion 61 on the lower side of the side wall 61 extending forward.
A is formed and one bracket 64 is formed in the turning part.
It is screwed into the This bracket 64 straddles the front and rear of the crankcase 22, and has a pair of threaded portions 22.
It is fixed at b. Further, a stay 60α is attached to the lower side of the partition wall 60 so as to be biased toward the side wall 162 by C, and the stay 60 (L) is screwed onto the crankcase 22.

In summary, the partition wall 60 and both side walls 6 integrated therewith
11.62 is small because it is fixed to the crankcase side by the bent portion 61α and the stay 60α (see Figs. 3 and 7).

Further, a pair of left and right openings 63 (L) are formed in the heat shield plate 63, and corresponding to these openings 63α, an opening 53 is also formed in the cut member 50, and both openings 53.63α
The rubber duct 64 is attached by fitting the rubber duct 64.

This duct 64 conducts the heat emitted from the exhaust silencer 40 and the cylinder below it by a force/kube section 50.
It is attached to allow the heat to escape upward (see Figures 3, 4, 6, and 7).
The radiant heat emitted from the cylinder 23 escapes upward through the heat dissipation window 52 formed at the rear part of the cylinder 23. On the other hand, the exhaust bow of the cylinder 23 is , located on the ground side, and the exhaust port 23 (opening 26 of the shroud 26 formed corresponding to L).
The exhaust pipe 4] is fixed to the exhaust port 23a. And l! 'Il' Exhaust silencer 40 communicating with trachea 41
, so f] A pair of left and right stays 4 protruding from the lower front.
Crankcase 22 with 0αG iron, screw and 10h
(See Figures 7 and 9).

In addition, a stay 27 is screwed onto the top surface of the shroud, and a pair of left and right stays 5 are provided protruding from the rear end of the cover member 500.
4B is screwed onto the screwed portion 27α of the stay 27 (see FIG. 8). Late G Ko, Kak (Part 47'
50 is fixed to the bracket 35 at the front and to the stay 27 at the rear 6 o Then, covering the rear end of the cover member 500 from the outside, a protection plate 58 is attached to the screw 58σ. There is a screw thread λt on the 27/1 part of the stay 27, and this retaining plate 58c, the cylinder 2
30. Cover the top part from the rear. The open end of the exhaust pipe 42 extending from the exhaust silencer 40 is located at the lower end of the protection plate 58σ (see Figures 3, 4, 7, and 8).
.

In addition, in addition to the heat dissipation window 52 and the opening 53, the outside air introduction window 51 and the carburetor adjustment opening 50a are not formed in the cover part 50. A cap 59 is removably fitted to the opening 50 (L). (See Figure 7).

This embodiment is constructed as described above, and when the engine is running, outside air is introduced into the intake chamber A through the narrow 71 portions such as around the outside air introduction window 51, the area around the partition plate 330, or around the duct 5.
ait-, the air is inhaled from the suction duct 32a of the air cleaner 31. During this time, dust generated during driving, water droplets G, partition wall plate 33, partition wall 60, side wall 61,
The load on the air cleaner 3J is reduced because the cylinder 2:3 is removed by collision with the duct 25, etc. Also, the cylinder 2:3 is connected to the shroud 26 by passing through the duct 25.
The air introduced into the interior is forcedly cooled and the hot air flows through opening 2.
6 (is discharged downward from the cylinder 23. Then, a part of the hot air emitted from the cylinder 23 rises, and along with the hot air emitted from the exhaust silencer 40, passes through the duct 64 to a part of the cover. It is discharged to the outside of vi50.In this way,
The hot air emanating from the cylinder 23 and the exhaust silencer 40 does not affect the intake auxiliary equipment 30 in the intake chamber A, or the resin cover member 50, and blows downward and into the cover part 50. It is extremely effective because it emits water upwards.

Furthermore, the radiant heat generated from the exhaust muffler 40 is at a lower temperature than that of the cylinder 23, and since the partition wall 60 and the heat shield plate 63 are provided, the radiant heat generated by the exhaust muffler 40 is lowered by the intake auxiliary equipment 30. Or part of the hippo
There is almost no thermal effect on the i50.

Note that the heat of the heated heat shield plate 63 is taken into the cover member 50 through the outside air introduction window 5] and is transferred to the h duct 25-+11.
11 walls 61, 62. ! l:, rear wheel Rw 17)
Both the flow 1z;':r and the traveling M are discharged to the outside of the cover member 50 through the heat dissipation attraction 52.

Further, the intake auxiliary equipment 30 is connected to the cylinder 23 until
[Cylinder 23, or G
Also, since the hot air generated from the exhaust muffler 40 is blown toward the rear of the vehicle body by the running wind, the thermal influence on the intake auxiliary equipment 30 is minimal.

In addition, the duct 25 and both side walls 61 and 62 are located between the intake auxiliary equipment 3° and the exhaust silencer 40, and the later @RW, and prevent dust, water droplets, etc. that may be attached to the rotation of the rear wheel RW. ? It has the effect of blocking.

Furthermore, the center of gravity of the power unit 210 is reduced as much as possible by arranging the engine cylinder 23 at the rear of the crankcase 22 (on the rear side of the vehicle body) in an inclined position pointing toward the rear of the vehicle body. There is also the advantage that the overall height of the rear vehicle body 20 is reduced.

Note that the tilted posture of the cylinder 23 can also be such that the tilt angle θ (see FIG. 3) with respect to the horizontal line H is approximately zero.

As is clear from the above description of the embodiments, the present invention has a front wheel for steering and two rear axles for driving, and a power unit is disposed between the two rear wheels for driving. In a vehicle covered with Because the exhaust silencer is installed, the cylinder, which is a high-temperature heating element, is located at the bottom of the rear end of the garage, making it easy to catch the wind flowing below the car body, which has a large cooling effect. is located on the front side away from the cylinder, and the adjacent 1-filter exhaust muffler is at a lower temperature than the cylinder, so it is less likely to be affected by heat.

Furthermore, by arranging the cylinder in the rear part of the crankcase so as to point toward the rear of the vehicle body, there is the advantage that the center of gravity of the vehicle is lowered.

[Brief explanation of drawings]

Fig. 1 is a left side view of a tricycle equipped with a power unit according to an embodiment of the present invention, Fig. 2 is a rear view thereof, and Fig. 3 is a longitudinal side view of the main part of the vehicle body. Plan view, Figure 5ci is a sectional view taken along line V-V in Figure 3, Figure 6 is a sectional view taken along line II--■ in Figure 3, and Figure 7 is an exploded perspective view of essential parts of the rear vehicle body. Figure 8 is a perspective view showing the relationship between several examples of b cover parts and shrouds in the same rear vehicle body;
FIG. 9 is a perspective view of the exhaust muffler in the rear vehicle body. ■...Auto tricycle, 2...Front body, 3...Main frame, 4...Leg shield, 5...Step, 6...Rear joint case, 13a...Bracket, 14 ...Screw, 15...Rear cushion, 20...Rear body, 21...Power unit, 22...
・・Crankcase, 22a・・Stay, 22b・・
・Thread N part, 23...Cylinder, 23α...Exhaust hole), 24...Fan cover, 25...Duct,
26... Shroud, 27... Bracket, Addition... Intake auxiliary equipment, 31... Air cleaner, 32... Air cleaner-case, 32a... Intake duct, 33 Pa bulkhead plate, 34 ...Stay, 34α...Komuro, 34
A...Screw, 35...Bracket, 36...Connecting pipe, 37...Carburetor, 40...Exhaust silencer,
40 (1... stay, 40 h... screw, 41.
42...Exhaust pipe, 50...Part of cover 44.51...Outside air introduction window, 52
... Heat dissipation window 53 - ... Opening, 54 A, 54
B - Stay, 54 (L-... IP bin, 54
h...Screw opening, 55...Grommet, 56...
・Screw, 57... Grommet, 58... Maintenance plate, 5
9... Cap, 60... Partition wall, 60 G... Stay, 61... Side wall, 61 (1... Bent part, 62
... side wall, 63 ... heat shield analysis, 63 a ... opening,
64...Duct, 70...Ignition coil, A...Intake chamber. Agent: Patent attorney Nozomi Ehara (1 person)

Claims (1)

[Claims] In a vehicle having a front wheel for steering and two rear axles for driving, a bow unit by disposed between the two rear wheels for driving, and a cover member provided on the upper surface Qfi of the two rear wheels for driving and the power unit. The cylinders of one engine are arranged on the rear side of the vehicle body with respect to the crankcase, and the intake auxiliary equipment is placed at the front of the space defined by the cover member and the power unit exit surface. A vehicular power unit comprising: an exhaust silencer disposed at the rear of the space;