JPS60267B2 - Engine suspension system for bicycles with engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine suspension system for a bicycle with an engine,
In particular, the present invention relates to an engine suspension system for an engine of a bicycle with an engine, in which driving force from the engine is transmitted via a belt or chain to a drive roller pressed against the outer periphery of a rear wheel.

This type of engine-equipped bicycle is equipped with an engine that is swingably attached to the lower part of the frame via a single pivot, and a drive roller that is swingably attached to the frame behind the engine. These are connected by belts or chains.

Further, the engine is deflected around the pivot in a direction that applies tension to the belt or chain by the spring force of the spring, and the drive roller is pressed against the outer periphery of the rear wheel against the action of the spring. . This structure has the disadvantage that if the belt or chain stretches too much or breaks due to long-term use, the engine will swing and collide with the frame etc., resulting in damage.

In addition, even if the belt or chain is easily stretched, the tension from the spring continues to act, so the belt or chain will continue to stretch and eventually break, leading to engine damage or the belt or chain becoming entangled (locked). ). SUMMARY OF THE INVENTION An object of the present invention is to eliminate such conventional drawbacks, and to provide an engine suspension system that reliably prevents the above-mentioned engine damage and allows easy inspection of belt or chain elongation in advance.

According to the present invention, an engine suspension system for a bicycle with an engine includes: an engine swingably supported on a frame via a single pivot; a primary pulley supported by the engine and driven by the engine; a drive roller that is swingably attached to the frame and pressed against the outer periphery of the rear wheel; a secondary pulley that drives the drive roller; and a belt or chain that is stretched between the primary pulley and the secondary pulley; a spring disposed between the engine and the frame and capable of biasing the engine about its pivot in a direction that increases the sliding distance between the primary pulley and the secondary pulley; and a stopper means disposed between the engine and the frame. An engine suspension system for a bicycle with an engine is provided. In this case, the stopper is composed of a rubber-like elastic member attached to either the frame or the engine and a saddle member provided on the other, and when the elongation of the belt or chain reaches a predetermined amount, the rubber-like elastic member It is preferable that the elastic member and the twill member are arranged so as to be in contact with each other, thereby preventing the belt or chain from breaking in advance and absorbing the impact upon engine collision.

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4, an engine 16 is swingably mounted to the lower part of a bicycle frame 12 via a single pivot shaft 14. As shown in FIGS.

In the illustrated example, the pivot shaft 14 is provided on an engine bracket 18 that is fixed to the frame 12 via a buffer member 17 (see FIG. 3). A primary pulley 21 is attached to the output shaft (crankshaft in the illustrated example) 20' of the engine 16. A drive roller 24 is provided at a position adjacent to the outer periphery of the rear wheel 22 behind the engine.

The driving roller 24 is connected to a bag holder 225 provided on the frame 12.
It is installed so that it can swing around the center. That is, the fourth
As shown in the figure, a pivot 2 is rotatably supported on the bag holder.
It is rotatably supported by the tip of an arm 28 fixed to both sides of the arm 6. An operating punch 30 is fixed to the arm 28 and extends rearward. As shown in FIGS. 1, 5, and 6, the operation panel extends through a guide plate 31 fixed to the frame 12, and has a /b 30A at its tip. In this way, when the control village is set at the position shown by the solid line in FIGS. 5 and 6, the drive roller 24 is brought into pressure contact with the outer peripheral surface of the rear wheel to be in the driving state, and when set at the position shown by the two-dot chain line, the drive roller 24 is driven. The roller 24 is separated from the outer peripheral surface of the rear wheel to cut off the driving force. A secondary pulley 34 is attached coaxially to the drive roller 24 via a far D clutch 32, and the secondary pulley and the primary pulley 2
A power transmission belt 36 is stretched between the power transmission belt 1 and the power transmission belt 36.

On the other hand, a tension spring 40 is stretched between the metal fitting 38 fixed to the head of the engine 16 and the engine bracket 18, and the spring force causes the engine 16 to rotate around its pivot 14 as shown in FIGS. 1 and 2. The cylinder is tilted clockwise.

Therefore, the spring force of the spring 40 maintains a predetermined interaxial distance between the primary pulley 21 and the secondary pulley 34, and applies a predetermined tension to the belt 36. In addition, a chain type transmission device can also be used in place of the belt type transmission devices 21, 34, and 36. As can be seen from the drawings, the engine-equipped bicycle shown in FIGS. Handle 42, front wheel (steering wheel) 4 mounted below the steering shaft
4. A saddle 46 supported at the top of the frame, a pedal 48 for foot running provided at the bottom of the frame, and a chain cover 50 that covers the sprocket and chain for foot running
Equipped with etc.

Therefore, in the engine suspension system of the present invention, stopper means is provided between the engine 16 and the frame 12, as particularly clearly shown in FIGS. 2 and 3.

The stopper means is comprised of a seat rubber 54 made of an elastic material such as rubber and attached to a support fitting 52 integrally provided with the engine bracket 18, and a seat member 56 provided on the engine side. In the illustrated example, an engine cover that covers the engine cylinder portion is used as the saddle member 56.
As the stopper means, contrary to the illustrated example, a rubber-like elastic member (seat rubber 54) may be provided on the engine side, and a portion corresponding to the abutment member 56 may be provided on the frame side.

Furthermore, it is also possible for both members to be made of rubber-like resilient material. Therefore, in a power-driven state in which the drive roller 24 is pressed against the outer periphery of the rear wheel 22 against the spring force of the spring 40, the rubber-like elastic member 54 and the saddle member 56 are in contact with each other as shown in FIG. A predetermined interval X is secured between them. However, as the belt 36 or chain stretches due to long-term use, the action of the spring 40 causes the engine 16 to move about its pivot 14 and the distance x decreases. As the elongation increases, both members 54 and 56 will eventually come into contact and the engine will no longer move. This contact is designed to occur before the belt or chain breaks, so that after contact, the tension in the belt or chain is reduced and the belt or chain does not break. Furthermore, since the degree of the gap x can be easily confirmed, the degree of elongation of the belt or chain can also be easily checked. Furthermore, since the rubber-like elastic member 54 is used, it is possible to absorb the impact upon contact with the engine. The stopper means allows both members 54 and 56 to come into contact even when the operation village 30 is set at the position shown by the two-dot chain line in FIGS. I and 2 and the drive roller 24 is separated from the rear wheel 22. In this case as well, vibrations during running can be absorbed by the rubber-like elastic member 54 and the buffer member 17, so engine damage can be effectively prevented.

[Brief explanation of the drawing]

Fig. 1 is a side view of an engine-equipped bicycle equipped with an engine suspension system of the present invention, Fig. 2 is a partially cut-out enlarged side view of the engine suspension system of Fig. 1, and Fig. 3 is a line m in Fig. 2. FIG. 4 is a sectional view taken along the line WW in FIG. 2. FIG. 5 is a partially enlarged side view showing the operation area of the drive roller, and FIG. 6 is a sectional view taken along the line - in FIG. The same reference numbers in each figure indicate the same parts.
...Frame, 14...Axis, 16...Engine, 21
...Primary pulley, 22...Rear wheel, 24...Drive roller, 26...Pivot, 28...Arm, 34...
・Secondary pulley, 36...belt, 40...spring, 54
... Rubber-like elastic part, 56 ... Saddle member, X.
...Indicates the gap dimensions. Figure 2 Figure 1 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. An engine suspension system for a bicycle with an engine, which includes an engine rotatably supported on a frame via a single pivot shaft, and a primary pulley supported by the engine and driven by the engine. a drive roller that is swingably attached to the frame and pressed against the outer periphery of the rear wheel; a secondary pulley that drives the drive roller; and a belt or chain that is stretched between the primary pulley and the secondary pulley. a spring disposed between the engine and the frame for biasing the engine about its pivot in a direction that increases the interaxial distance between the primary and secondary pulleys; and a stop means disposed between the engine and the frame. An engine suspension system for a bicycle with an engine. 2. In the engine suspension system according to item 1, the stopper means is composed of a rubber-like elastic member attached to either the frame or the engine, and an abutment member provided on the other, and Alternatively, an engine suspension device for an engine-equipped bicycle is arranged so that the rubber-like elastic portion and the contact member are brought into contact when the chain reaches a predetermined amount of elongation.