JPH0538792Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] When a toy car with a model engine is run on a track, it is necessary to perform a run similar to that of an actual vehicle when starting and running on a slope. This invention relates to a stepless drive mechanism for model engines that makes it possible.

[Prior Art] Conventionally, when the power for this type of model engine is provided by a built-in battery, the model car is driven by transmitting the rotation directly from the rotating shaft of the motor using the battery to the driving wheels of the car. The method is generally known.

[Problem that the invention aims to solve] When starting a conventional model car, it suddenly starts running at full speed, and also runs on a slope in the same way as on a flat road, so it is difficult for viewers to actually see the model car. The problem was that the lack of a realistic experience of driving a vehicle diminished interest.

The present invention is a stepless model engine that allows the model engine to run in a manner similar to the actual running of the vehicle, whether starting off or running on a slope, without directly transmitting the rotation of the battery-powered motor to the driving wheels. The purpose is to provide a driving mechanism.

[Means for Solving the Problems] In order to achieve the above object, the stepless drive mechanism for a model engine according to the present invention includes a case in which a magnet is attached to the inner surface of a cylinder and one side is open, and a case inside the case. The inner concave surface of a magnet is a rotating body that has a drum with one side open that can rotate while maintaining a certain gap, one or more blades provided on the surface of the cylindrical part perpendicular to the axial direction, and a cover plate and a bottom plate. and a plurality of steel balls stored therein.

The rotating shaft passing through the shaft hole at the bottom of the case is fixed on a protrusion formed on the outside of the drum bottom, and the shaft end is inserted into the shaft hole of the cylindrical part of the rotating body and its bottom plate, and the rotating shaft is The drive shaft is fixed on a protrusion formed on the outside of the cover plate of the body, and the shaft end is inserted into the shaft hole of the cylindrical part of the rotating body, so that the rotation of the rotating shaft is transmitted to the drive shaft. We have taken technical measures to improve the quality of our products.

[Function] When the drum is rotated within the case by the rotating shaft, the multiple steel balls inserted before the rotating body is introduced into the drum and assembled are attracted by the magnets attached to the inner surface of the case on a flat road. It is attracted to the inner surface of the drum by its magnetic force. Then, the number of steel balls that are attracted gradually increases, and as a result, the force that presses the blades of the rotating body acts, and as a result, the rotating body gradually rotates while slipping. The speed increases to follow.

Also, when going uphill, the rotating body slips inside the drum, so it is decelerated, and when it reaches a flat area, the speed is increased again. On a downhill slope, the rotation of the rotating body is saved by the suction force acting on the steel balls, and the rotation slips against the drum, so the drive shaft is decelerated regardless of the rotational speed of the motor.

[Example] Examples will be described with reference to the drawings.

In FIGS. 1 and 2, a case 1 is made of iron and has a cylindrical shape, and one side is open, and the other bottom has a shaft hole 12 having a diameter slightly larger than that of the rotating shaft 5.
Magnets 11a and 11b are mounted on the inner surface of the case 1 in close contact with each other in parallel with the axial direction and facing each other in the longitudinal direction. In this case, it is preferable to use a permanent magnet as the magnet.

The drum 2 is made of non-ferrous metal and has a cylindrical shape, and is open at one end, and has a protrusion 21 formed on the outside of the other bottom, a shaft hole 22, and a screw hole 2 for fixing the rotating shaft 5.
3.

In Fig. 3, the rotating body 3 is attached to the outer surface of a cylindrical portion made of non-ferrous metal at a right angle to the axial direction and has a length approximately equal to the length of the cylindrical portion in the longitudinal direction, and the inner surface of the drum is longer than the diameter of the steel ball. Blades 31a, 31b, 31c, and 31d having heights with small gaps are provided at equal angles. Further, a cover plate 32 having the same diameter as the outer diameter of the drum 2 is attached to the drive shaft side of the rotating body 3 on the opening side of the drum 2. A bottom plate 36 is attached to the rotating shaft side of the rotating body 3, and the cover plate 32 and the bottom plate 36 of the rotating body 3 are integrated. Further, the protrusion 33 formed on the outside of the cover plate 32 has a shaft hole 34 through which the drive shaft 6 passes and a screw hole 35 for fixing the drive shaft 6.

The present invention is constructed by assembling and combining the respective constituent members as described above. First, on the drum side, the rotating shaft 5 is passed through the shaft hole 12 at the bottom of the case 1, and then the rotating shaft 5 is inserted into the protrusion 21 of the drum 2. It is passed through the drilled shaft hole 22 and fixed with a screw from the screw hole 23. Note that when introducing the rotating body 3 into the drum 2, the shaft end is formed into a shaft hole 3 having a slightly larger diameter than the rotating shaft 5.
7a and 37b. Therefore, the drum 2 is configured to be able to rotate while maintaining a constant gap from the inner concave surfaces of the magnets 11a and 11b.

Next, on the rotating body side, after attaching the bottom plate 36 to the rotating body 3, inserting the steel balls 7 and attaching the cover plate 32 to the other end of the unit, the protrusions 33 formed on the outside of the cover plate 32 are attached. The drive shaft 6 is passed through the drilled shaft hole 34 and fixed with a screw from the screw hole 35. Further, the shaft end is inserted into the cylindrical portion of the rotating body. Therefore, the structure is such that the drive shaft 6 can be rotated by the rotation of the rotating body 3.

When the rotating body 3 is introduced from the drum opening in the assembled and combined state as described above, the axial directions of the rotating shaft and the driving shaft coincide, and the stepless drive mechanism for a model engine according to the present invention is constructed. Ru. In this case, the rotating shaft 5 on the drum side and the drive shaft 6 on the rotating body side are not connected, so the rotation of the drum and the rotation of the rotating body are independent.

The steel balls are preferably balls for ball bearings with a diameter of about 1.5 to 2 mm, and the number of steel balls may be selected depending on the rotational torque of the rotating body 3.

[Advantages of the Invention] Since the present invention is configured as described above, it has the following advantages.

In the present invention, since the number of component parts is small and the processing does not require particularly high precision, assembly is simple and the purpose can be easily achieved, and moreover, it can be provided at low cost.

Further, since the rotating shaft on the drum side and the drive shaft on the rotating body side are separate and independent in terms of structure, assembly and inspection are easy.

Even if the rotation on the drum side is constant, the speed is continuously variable and the rotating body transmits to the drive shaft changes corresponding to the model car's starting run, running on a slope, or irregular changes in rotation. Therefore, it is excellent as a toy since it gives a feeling similar to actually driving a vehicle.

[Brief explanation of the drawing]

Figure 1 shows how each member is assembled as a stepless drive mechanism.
A cross-sectional view of the combined main parts, and Figure 2 is a cross-sectional view (A-A
3 shows a perspective view of the rotating body and its assembled parts. 1... Case, 2... Drum, 3... Rotating body,
5... Rotating shaft, 6... Drive shaft, 7... Steel ball, 11
a, 11b... magnet, 12, 22, 34, 37
a, 37b...Shaft hole, 21, 33...Protrusion, 2
3, 35... screw hole, 31a, 31b, 31c,
31d...Blade, 32...Lid plate, 36...Bottom plate.

Claims (1)

[Scope of utility model registration request] A case 1 with magnets 11a and 11b attached to the inner cylindrical surface and one side open, and a drum 2 with one side open that can rotate while maintaining a constant gap between the inner concave surfaces of the magnets 11a and 11b inside the case 1. , a rotating body 3 having one or more blades 31 provided on the surface of the cylindrical part perpendicular to the axial direction, a cover plate 32, and a bottom plate 36, and a plurality of steel balls 7 housed therein. The rotating shaft 5, which passes through the shaft hole 12 at the bottom of the case 1, is fixed at a protrusion 21 formed on the outside of the bottom of the drum 2, and the shaft end is connected to the cylindrical portion of the rotating body 3 and its bottom plate 36. shaft hole 37
a, 37b, and the cover plate 32 of the rotating body 3
A stepless drive mechanism for a model engine, in which a drive shaft 6 is fixed at a protrusion 33 formed on the outside of the engine, and the shaft end is inserted into a shaft hole in a cylindrical portion of a rotating body.