JPS58218480A - Automatic tricycle for travelling on wasteland - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a three-wheeled motor vehicle for traveling on rough terrain, which includes a pair of left and right rear wheels and transmits the driving force of an engine to the rear axle via a chain.

There are three-wheeled vehicles for traveling on rough terrain that are equipped with ultra-low pressure balloon tires. In many vehicles of this type, engine driving force is transmitted to the rear axle via a chain. It is preferable to cover this chain with a chain case to prevent muddy water, dirt, etc. from adhering to it.

Conventional chain cases have been configured such that the peripheral edges of a pair of left and right side plates are joined together using a plurality of bolts, rivets, or the like. However, because balloon tires are particularly wide, it is difficult to reach the chain case located behind the tire, and it is especially difficult to install and remove bolts near the rear axle. For this reason, when removing the chain case for inspection and maintenance of the chain, there is a problem in that tools are difficult to use and maintainability is extremely poor.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a tricycle for traveling on rough terrain, in which the chain case can be easily opened and closed, and maintainability is improved.

In order to achieve this object, the present invention provides a tricycle for traveling on rough terrain, which is equipped with a pair of left and right rear wheels and which transmits the driving force of the engine to the rear axle via a chain. The rear edge of the chain case is connected by engaging claws and claw holes provided on each side plate with each other, and the front parts of the both side plates are connected by bolts passing through the side plates. It is configured as follows. The present invention will be described in detail below based on the illustrated embodiments.

FIG. 1 is a partially sectional side view of an embodiment of the present invention;
Figures 2 and 3 are a cross-sectional view taken along the line ■-■ in Figure 1.
4 is an exploded perspective view of the chain case, and FIG. 5 is a cross-sectional perspective view showing the engaged state of the pawl and the engagement hole.

In FIG. 1, reference numeral 10 denotes a frame, and the frame 10 includes a steering head vibe 12, a down tube 14, a lower tube 16, a pillar tube 18, a back tube 20, and the like.

An engine unit 22□' is mounted between the down tube 14 and the pillar 18.

The engine unit 22 is formed integrally with the engine and the transmission, and the transmission is housed in the crank teeth. An output shaft protrudes from the rear left side surface of this engine unit 22, and a drive sprocket 24 is fixed to this output shaft. Note that there are a pair of left and right lower tubes 16, pillar tubes 18, and back tubes 20, but only one of them is shown in FIG.

The rear end of the lower tube 16 projects further rearward than the pillar tube 18, and the rear end protruding portion of the lower tube 16 and
A bracket 26 is fixed to a portion surrounded by the pillar tube 18 and the back tube 20.

In Figure 1.2, 28 is the rear axle. After this axle 2
The bearing sleeve 30 of No. 8 is fixed to the bracket 26 by a plurality of bolts 62, and the rear axle 28 passes through this bearing sleeve 30. 032 is a ←:' bearing of the rear axle 28. A driven sprocket 34 is fixed to the rear axle 28 as shown in FIG.

A splined boss member 66□' is spline-coupled. This sprocket 34 has a larger diameter than the driving sprocket 24 of the engine unit 22.

A chain 66 is wound around both sprockets 24, 34. 38 is a rear wheel made of ultra-low pressure balloon tires. The rear wheels 3a are a pair of left and right wheels, which are fixed to the left and right ends of the rear axle 28, respectively.
Only one side appears in Figure 2.

In FIG. 1, 40 is a steering fork, which is attached to the head pipe 12 via brackets 42 and 44 so as to be rotatable left and right. 46 is one front wheel made of an ultra-low pressure balloon tire, and 48 is a steering handle.

Further, 50 is a fuel tank, 52 is a tank cover that covers the tank 50, 54 is a chaffender made integrally to cover the upper parts of the left and right rear wheels 68, and 56 is a seat, and this seat 56 covers the tank cover 52 and the rear fender. 54
is placed on top.

60 is a left and right split chain case. This chain case 60 has a pair of left and right side plates 62 and 64 made of synthetic resin.
has. One side plate 62 has two screws 66 and 68,
χ is fixed to the bracket 26. The peripheral edge of this side plate 62 is bent so as to cover the outer periphery of the chain 66, as shown in FIG. 2.4. Further, claws 70 and 72 projecting rearward are integrally formed on the opening edge at the rear end of this side plate 62. Note that a four part 74 is formed at a position slightly forward of the center of the side plate 62, and this four part 74 is connected to a bracket 76 fixed to the pillar tube 18 of the frame 10.
(See Figure 6).

The other side plate 64 is formed to cover the opening of the side plate 64 and the drive sprocket 24, and has a claw hole 78.80, into which the mold 70.72 engages, integrally formed at its rear edge. Further, the side plate 64 is formed with an insertion hole 82 for the rear wheel 28, as is clear from FIG. 4, and a four part 84 that abuts on the four part 74 of the side plate 62, as shown in FIG.

When assembling the chain case 60 for the first time, first remove the side plate 64 from its insertion hole 82 with one rear wheel 68 removed.
into the rear axle 28, and insert the pawl hole 78.80 into the pawl 70.72.
Move it slightly from the back to the front so that it engages with the Then, overlap the side plates 62 and 64, and insert the thumbscrews 86 passing through the recesses 84 and 74 into the bracket 76 on the frame 10 side.
screw into the nut 88 (Fig. 6) that is secured to the

When performing maintenance and inspection of the chain 36, insert your hand between the rear wheel wheel 8 and the engine unit 22 from in front of the left rear wheel wheel 8 and unthread the thumbscrew 86. Note that the thumbscrew 86 is located at the front of the side plate 64, so it can be easily reached when inserting your hand. Next, the entire side plate 64 is shifted rearward while raising the front edge of the side plate 64 laterally. At this time, the claw holes 78.80 are removed from the claws 70.72, and the side plate 64 is separated from the side plate 62.

As a result, the chain 36 and sprockets 24 and 34 are exposed. In this state, it is best to inspect and maintain the chain 36, etc. Also, when installing the side plate 64, hold the front end of the side plate 64 upside down and insert the claw 78.80 into the claw 70.7.
2 and tighten the wing screw 86. Note that since the thumbscrew 86 is sufficiently spaced 1' from the rear axle 28, it can be easily attached and detached even if it is located on the back side of the rear wheel 38.

In this embodiment, the side plates 62, 64 are made of synthetic resin with appropriate elasticity, so that the claws 70, 72 and the claw holes 78, 80
It is possible to provide a tightening margin with appropriate elasticity in the tightening portion of the thumb screw 86 in a state in which the thumb screws 86 are engaged with each other. Due to this interference, no play occurs between the claws 70.72 and the claw holes 78.80, and the side plate 64 can be securely fixed to the claw holes 78.80.

Further, by using the thumbscrew 86, the chain case 60 can be opened and closed without using any special tools, which further improves work efficiency. In addition, as in this embodiment, the claws 70.7
2 protrudes rearward and the claw holes 78, 80 are formed to open rearward, the claws can be engaged with the claw holes simply by shifting the side plate 64 in the front-rear direction, making it easier to attach and remove the side plates. Become. Also, when installing the side plate 64, the claws 70.
After the hooks 72 are engaged with the pawl holes 78, 80, the movement of the side plate 64 in the width direction of the vehicle body is restricted, making attachment of the side plate 64 easier. Furthermore, as in this example.

By setting the position where both side plates are connected with bolts to be surrounded by the chain 36, there is no need to extend the chain case 60 beyond the chain 36 in order to secure a space for tightening the bolts. It can be kept small.

As described above, the present invention forms a chain case that covers the chain with a pair of left and right side plates, and the rear edge of the case connects both side plates by engaging with the claws and the claw holes, and the rear wheel and engine are connected from the front of the wheel. This can be done within easy reach by putting your hand in between, and it is easy to attach and detach even if the chain case is located behind the rear wheel. As a result, maintainability near the chain is improved.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of one embodiment of the present invention, and FIG.
．． Figure 6 is a cross-sectional view taken along the line ■-■ and a cross-sectional view taken along line T'', Figure 4 is an exploded perspective view of the chain case, and Figure 5 is a cross-sectional perspective view showing the engaged state of the pawl and the retaining hole. . 22...0 engine unit, 28...rear axle, 36
...Chain, Ro8...Rear wheel, 60...Chain case, 62.64...Side plate, 70.72...Claw,
78.80...nail hole. Figure 4 Figure 5

Claims (1)

[Claims] A three-wheeled motor vehicle for traveling on rough terrain, which is equipped with a pair of left and right rear wheels and which transmits the driving force of an engine to the rear axle via a chain, includes a left-right split chain case that covers the chain with a pair of left and right side plates, An automatic vehicle for traveling on rough terrain, characterized in that the rear edges are connected by engaging claws and claw holes provided on each side plate with each other, and the front parts of both side plates are connected by bolts passing through the side plates. tricycle.