JPH0544575Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a coupling for a propeller driven by an engine, and more specifically, it is suitable as a coupling for a propeller in a radio-controlled airplane for spraying agricultural chemicals. This relates to couplings used in

[Prior art and issues to be solved]

Conventionally, when driving a propeller with an engine, if the propeller is attached directly to the output shaft of the engine, the torque fluctuation during one revolution is large in engines with a small number of cylinders, and the inertia of the propeller itself is also large. Excessive loads are applied to rotating parts such as the crank, causing problems such as twisting of the crankshaft.

This kind of twisting of the crankshaft can be solved by using a propeller with a small inertial force, but this makes it impossible to obtain the desired thrust. Efforts have been made to connect the engine's output shaft and propeller drive shaft with a V-belt.

However, it has been pointed out that there are further issues that need to be solved, such as increasing the rotating part increases the weight and manufacturing cost, and although the V-belt functions as a damper against the load, the diameter of the propeller increases, making it impossible to downsize. A compact coupling that can coaxially connect the output shaft and propeller has been awaited.

[Means for solving problems]

Therefore, in this invention, a disc-shaped holding member is attached to the output shaft of the engine, and a damper made of an elastic material is erected along the circumferential direction on one side of the disc-shaped holding member, and the disc-shaped holding member and damper are connected to each other. A thrust receiving member is inserted between these dampers, and a damper casing that is set to have approximately the same diameter as the holding member and that accommodates each damper as one is attached to the outside of these dampers, and furthermore, a propeller boss is coaxially attached to this damper casing. By employing a configuration in which the motor is mounted in a fixed manner, various loads such as torque fluctuations and large inertia forces can be suitably buffered.

In this case, by disposing heat dissipating fins along the outer periphery of the damper casing, the heat generated by the damper during buffering of these loads can be dissipated appropriately and durability can be improved.

[Effect]

With this idea, the rotational driving force of the engine is transmitted from the holding member to the propeller body via each damper and the damper casing, and loads such as torque fluctuations and inertial force from the propeller itself are suitably absorbed by the buffering action of each damper. .

〔Example〕

Next, as a preferred embodiment of the propeller coupling according to the present invention, a pusher type propeller coupling will be illustrated and described in detail below with reference to the accompanying drawings.

1 to 3, the propeller coupling 10 according to the present invention is constructed by inserting the cylindrical part 14 of the circular holding member 12 into the output shaft 16 of an engine (not shown) and attaching it to the output shaft 16 of the engine (not shown). Six damper pins 18 are erected at equal angles in the circumferential direction on the outer surface of the member 12,
A cylindrical rubber damper 20 is attached to these damper pins 18. The rubber damper 2
A thrust washer 22 is inserted between the rubber damper 20 and the holding member 12, and the rubber damper 20 and the thrust washer 22 receive the thrust of the propeller, thereby reducing frictional resistance and heat generation.

On the other hand, the outside of the rubber damper 20 has approximately the same diameter as the holding member 12, and each rubber damper 20
An aluminum damper casing 24 having accommodation recesses 23 formed therein is disposed at positions corresponding to the cylindrical part 14, and the damper casing 24 is inserted into the cylindrical part 14 through the bush 26 and fixed with bolts 28. The damper casing 24 is held in the axial direction by the stopper plate 30.

An appropriate number of heat dissipation fins 34 are erected on the outer periphery of the damper casing 24 via fasteners 32, but if these heat dissipation fins 34 and the damper casing 24 are integrally formed, the heat dissipation effect can be improved. At the same time, the number of steps can be reduced.

Further, the boss 38 of the propeller A, which is held between a pair of holding members 36 and 36, is attached to the outside of the damper casing 24 by a stopper 40.

In the propeller coupler 10 according to the present invention configured as described above, the rotational driving force including engine torque fluctuation is transmitted to the propeller A in the order of output shaft 16 → holding member 12 → each rubber damper 20 → damper casing 24. On the other hand, propeller A
Conversely, the large inertial force of the rubber damper itself is transmitted to the output shaft 16 via each rubber damper 20, but since these loads are absorbed by the buffering action of each damper 20, the inconvenience that conventionally occurred is eliminated. can be avoided.

At this time, the heat generated during damping in each damper 20 portion is quickly dissipated to the outside via the heat radiation fins 34.

FIG. 4 shows an embodiment of a tractor-type propeller coupling in which the boss 38 of the propeller A, which is held between a pair of holding members 36 and 36, is attached to the damper casing 24 via a collar member 42 using a stopper 40. However, it goes without saying that in this case as well, the same effects as in the above-mentioned embodiments can be achieved.

[Effect of idea]

As mentioned above, according to the propeller coupling according to the present invention, the load caused by torque fluctuations or large inertia force can be suitably buffered by the damper, so the rotation of the propeller becomes smooth and the engine is not forced. There is no burden on the rotating parts, and damage to rotating parts such as the crankshaft can be reliably prevented as in the conventional case. In addition, the heat generated during buffering can be quickly dissipated by the heat dissipation fins, which improves durability.Furthermore, the coupling itself can be made smaller, and has various other advantages, and its practical effects are extremely large.

Although the preferred embodiments of the propeller coupling according to the present invention have been described above, the present invention is not limited to these embodiments. Of course, various modifications can be made without departing from the spirit of the present invention, such as using a thrust bearing or configuring this coupling as a drive shaft coupling for a pesticide spraying fan.

[Brief explanation of the drawing]

FIG. 1 is a front view of a preferred embodiment of the propeller coupling according to the present invention with the propeller portion omitted, FIG. 1 is a rear view of the propeller coupling shown in FIG. 1, and FIG. 4 is a sectional explanatory view corresponding to FIG. 2 of another embodiment of the propeller coupling according to the present invention. 12... Circular holding member, 14... Cylindrical part, 16
... Output shaft, 18 ... Damper pin, 20 ... Rubber damper, 22 ... Thrust washer, 24
...Damper casing, 26...Butsuyu, 2
8... Bolt, 30... Stopper plate, 32
... Stop, 34 ... Heat dissipation fin, 36 ... Pressing member, 38 ... Propeller boss, 40 ... Stop, 42
...Color parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A disc-shaped holding member is attached to the output shaft of the engine, and a damper made of an elastic material is erected along the circumferential direction on one side of the holding member, and the holding member A thrust receiving member is inserted between the damper and the damper, and a damper casing that is set to have approximately the same diameter as the holding member and that houses each damper as a unit is attached to the outside of these dampers, and a propeller boss is attached to the damper casing. A propeller coupler characterized in that the propeller coupler is attached coaxially. (2) The propeller coupling according to claim 1, further comprising a heat radiation fin arranged along the outer periphery of the damper casing.