JP4602934B2 - Electric starter device for model engine - Google Patents

Description

  The present invention relates to an electric starter device for a model engine that uses an engine as a drive source, and is particularly suitable for starting an engine of a model automobile by using a driving force of an electric motor.

  As a method of starting an engine mounted on a model car, for example, equipped with an engine as a driving source, a manual type (called a recoil start type) that rotates the crankshaft of the engine by pulling a string, and a motor There are two types of motors that rotate using the rotational force of the motor. In the method of rotating the engine by the manual method, there is a problem that the handle for pulling the string is exposed to the outside of the vehicle body and the appearance is bad, and the string is broken due to secular change. It was.

  In recent years, therefore, many electric starters using a motor as a drive source have been used. As an example, there is a GS15R engine in which a motor is integrally attached to an engine sold by the applicant company. Details of this engine will be described below with reference to FIGS.

  1 includes a connecting rod 11 whose one end is pivotally supported by a piston (not shown), and a crankshaft 12 whose other end is supported by a pin 12b attached to a disk portion 12a via a bearing 11a. It is a known model engine. Reference numeral 13 denotes an output shaft that rotates as the piston moves up and down.

Reference numeral 2 denotes an electric starter device. An electric motor 22 is fixed to a base 21, an output shaft 22a of the motor 22 is projected to the back side of the base 21, and a gear 22b is attached to the output shaft 22a. A fixed shaft 21a protrudes from the surface of the base 21 opposite to the surface on which the motor 22 is mounted, and an internal gear (not shown) that meshes with the gear 22b on the fixed shaft 21a. A first gear 23 having a small gear 23a meshed with a second gear 26 described later is rotatably supported. Reference numeral 21b denotes a protrusion having a screw hole for screwing a cover 28, which will be described later, to the base 21.

A bearing hole 21c is formed in the base 21, and a sleeve 21d made of a thin metal pipe is fitted and fixed to the bearing hole 21c, and two bearings 21e are fitted and fixed to the sleeve 21d. ing. A shaft portion of a starter shaft 24 having a flange 24a is rotatably supported on the bearing 21e. The flange 24a is formed with a groove 24b for selectively engaging the pin 12b on the engine 1 side at an interval of 180 degrees.

  A portion of the starter shaft 24 that protrudes from the base 21 is rotatably supported by a second gear 26 via a one-way bearing 25. Note that the one-way bearing 25 is press-fitted into a one-way bearing support 27 including a rotation preventing portion 27a and a cylindrical portion 27b whose outer periphery is formed in a hexagonal shape. Further, since the receiving hole 26a of the second gear 26 into which the one-way bearing support 27 is inserted is also formed in a hexagonal shape, when the second gear 26 rotates in one direction, the starter is interposed via the one-way bearing 25. Although the shaft 24 is rotated, the starter shaft 24 is not rotated by the one-way bearing 25 when the second gear 26 rotates in the other direction.

As described above, the gear group consisting of the first gear 23 and the second gear 26 attached to the base 21 is covered by attaching the cover 28 to the base 21, and the electric starter device 2 is completed. Then, the completed electric starter device 2 is fixed to the opening of the engine 1 by screwing through an O-ring 29. At this time, the assembly is completed by assembling so that the pin 12a of the crankshaft 12 is engaged with the groove 24b formed in the flange 24a of the starter shaft 24.

  When the motor 22 in the starter device 2 configured as described above is energized, the gear 22b is rotated, so that the second gear 26 is rotated via the first gear 23. When the second gear 26 is rotated, the starter shaft 24 is rotated via the one-way bearing 25, and the crankshaft 12 is rotated via the pin 12a engaged with the groove 24b of the flange 24a in the starter shaft 24. Then, the engine 1 is started.

Then, the engine 1 is started and a rotational force is generated on the crankshaft 12, and the rotational force acts on the starter shaft 24. The rotational force of the starter shaft 24 is absorbed by the one-way bearing 25 and transmitted to the second gear 26. Accordingly, the engine 1 is smoothly rotated.
“GS15R engine” electric unit in “ENGINE MODELS” on page 187 of “CATALOG & HANDBOOK” issued by Kyosho Corporation in 2006

By the way, in the above-described conventional starter device 2, the starter shaft 24 to which the second gear 26 is attached is pivotally supported by two bearings 21e , and the second gear 26 is connected to the starter shaft 24. Since the shaft is supported only by the one-way bearing 25, vibration is generated when a rotational force is applied to the second gear 26 by the motor 22 and during travel after the engine is started (particularly, a travel road with severe irregularities). As a result, backlash occurs between the starter shaft 24 and the one-way clutch 25. As a result, the internal structure of the one-way bearing 25 is damaged and the backlash increases. As a result, the meshing portion of the meshing portion of the second gear 26 and the first gear 23 becomes poor, and the rotational force of the motor is transmitted from the first gear 23 to the second gear 26 when the engine is started by the motor 22. There was a problem that the engine could not be started because engine was not performed.

  As is clear from the test results before improvement in the table of FIG. 4, the three starter devices of the above-described conventional example are continuously rotated by a motor and actually run continuously by an engine car. The test running time until the meshing of the gear 26 and the first gear 23 slips and the rotational force of the motor cannot be transmitted to the starter shaft 24 becomes unusable in a short time of 1.5 to 4 hours, and the time is short. As a result, it no longer functions as a starter device.

  The present invention is intended to solve the above-described problems. The object of the present invention is to provide a starter shaft and a one-way by bringing the second gear into a bearing state via a one-way bearing or a bearing with respect to the base. Since the play between the bearing and the bearing is prevented, an electric starter device for a model engine that can start the engine well even after running for a long time is provided.

The electric starter device for a model engine of the present invention is intended to achieve the above-described object, and the means of claim 1 includes a starter shaft for starting a model engine by being rotatably supported on a base and rotating. A one-way bearing fitted in a gear that decelerates and rotates the rotational force of the motor attached to the base, and the rotational force of the motor is supported by the starter shaft being pivotally supported in the one-way bearing. in the electric starter of the the model engine to rotate the model engine, the end of the one-way bearing to protrude from the gear, a portion out projecting by pivotally supported at the base, before Kimotodai On the other hand, the gear play can be prevented .

  As described above, one end of the one-way bearing protrudes from the gear, and the protruding portion is pivotally supported by the base so that the gear does not vibrate with respect to the base. Since one end of the bearing protrudes from the gear and the protruding part is pivotally supported by the base, the gear is prevented from vibrating with respect to the base. Therefore, between the starter shaft and the one-way bearing or bearing, There is an effect that a good engine start can be performed even if the engine runs for a long time without any play.

  In the present invention, one end of a one-way bearing or a bearing is protruded from the gear, and the protruding portion is pivotally supported by the base so that the gear does not vibrate with respect to the base.

  An embodiment of an electric starter device for a model engine according to the present invention will be described below with reference to FIG. In FIG. 1, the same reference numerals as those of the conventional example described above denote the same members, and a description thereof will be omitted.

In the present invention, the one-way bearing 25 is press-fitted together with the bearing 21e into the one-way bearing support 27 inserted into the second gear 26 in the conventional example described above, and one end of the one-way bearing 25 is connected to the second gear 26. It protrudes from the end surface of this and becomes the protrusion part 25a . Then, the protruding portion 25a of the one-way bearing 25 is inserted into the sleeve 21d of the base 21.

  Thus, by inserting the protruding portion 25a of the one-way bearing 25 into the sleeve 21d of the base 21, the one-way bearing 25 is in a cantilever support state with respect to the base 21, and the starter shaft 24 is in this cantilever state. It will rotate within the one-way bearing 25. Accordingly, the vibration between the starter shaft 24 and the one-way bearing 25 is reduced, and the occurrence of play is suppressed, and as a result, the second gear 26 and the first gear 23 caused by the play are generated even when traveling for a long time. No inconvenience occurs in the meshing of the meshing portion, and the engine starting operation can be performed well.

  The test results after the improvement in the table of FIG. 4 show that the engine car equipped with the three starter devices of the above-described improvement example has a time during which the engine can be started satisfactorily even after a long test run. All of them exceeded 10 hours, and it became clear that they functioned as a starter device even during a long test run.

In the embodiment described above, the end portion of the one-way bearing 25 is projected from the end face of the second gear 26, and the projecting portion is inserted into the sleeve 21d. The bearing 21e is not limited to the one-way bearing 25, and the protruding portion may be inserted into the sleeve 21d.

It is sectional drawing which shows the principal part of the electric starter apparatus of the model engine which concerns on this invention. It is a disassembled perspective view of the electric starter apparatus of the conventional model engine. It is sectional drawing which shows the principal part same as the above. It is a table | surface which shows the result of having done the endurance test of the conventional product and this invention product.

Explanation of symbols

1 Model Engine 2 Electric Starter Device 21 Base 24 Starter Shaft 25 One Way Bearing
21e bearing 26 gear

Claims (1)

  A starter shaft for starting a model engine by being rotatably supported by a base and rotating, and a one-way bearing fitted in a gear for reducing and rotating the rotational force of a motor attached to the base In the electric starter device of a model engine configured to rotate the model engine by the rotational force of the motor by supporting the starter shaft in the one-way bearing, one end of the one-way bearing protrudes from the gear An electric starter device for a model engine, wherein the protruding portion is pivotally supported by the base so that play of the gear can be prevented with respect to the base.

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