JPS6139109Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a drive device, particularly a drive device for starting an engine. The drive device for starting the engine will be explained below.

Conventionally, a drive device for starting this type of engine has been constructed as shown in FIG. That is, in Figure 1, 1
is the DC motor, 2 is the armature rotation axis of the DC motor 1,
3 is a spur gear attached to the front end of the rotating shaft 2;
is a planetary gear that is meshed with the spur gear 3 and urged to rotate; 5 is an internal gear that is internally meshed with the planetary gear 4 and is fitted and supported on the machine frame 6; 7 is an internal gear that supports the planetary gear 4; 9 is an output rotating shaft fixed to the flange 8; 1 is a support pin fixed to the flange 8;
0 is an overrunning clutch engaged with the output rotating shaft 9 by a helical spline, 11 is a shift lever that moves the overrunning clutch 10 on the output rotating shaft 9, and 12 is the overrunning clutch 1.
13 is a ring gear that is attached to an internal combustion engine (not shown) and meshes with the pinion; 14 is a sleeve bearing that is fitted on the inner peripheral surface of the front part of the machine frame 6 and supports the output rotating shaft 9; 1
5 is a sleeve bearing that is fitted into the front machine frame 16 and supports the front end of the output rotating shaft 9; 17 is an electromagnetic switch that biases the plunger 18 that is cam-engaged with the shift lever 11;

In the conventional device configured in this way, when the electromagnetic switch 17 is energized and the plunger 18 is attracted in the direction of the arrow, the shift lever 11 is urged to rotate in the counterclockwise direction shown in the figure, and the overrunning clutch 10 is moved in the direction of the arrow. The pinion 12 meshes with the ring gear 13. Next, electromagnetic switch 17
A main contact (not shown) is closed, the DC motor 1 is energized, a rotational force is generated on the armature rotating shaft 2, and the rotational force is transmitted to the planetary gear 4 via the spur gear 3. Here, the rotational force is decelerated and transmitted to the output rotating shaft 9, and the ring gear 13 is urged to rotate via the pinion 12 fixed to the overrunning clutch 10 which is engaged with this rotating shaft, and the internal combustion engine (not shown) is driven. is started.

This conventional type had the disadvantage that the power system did not have an impact force absorption mechanism, and the device, especially the planetary gear reduction mechanism, could be destroyed by the impact force.

This idea was made to eliminate the drawbacks of the conventional ones, and it installed a separate overrunning clutch on the armature rotating shaft.
Provided is a drive device, particularly a starter motor with a planetary gear reduction device, having impact resistance.

An embodiment of this invention will be described below based on FIG. 2. That is, in FIG. 2, 20 is an overrunning clutch mounted on the armature rotating shaft 2;
21 is an auxiliary shaft to which the one-way rotational force of the overrunning clutch 20 is transmitted, and 23 is a spur gear provided on the auxiliary shaft. The rest of the configuration is the same as the conventional one shown in FIG. 1, so the explanation will be omitted.

With this structure, the overrunning clutches 10 and 20, which have an impact load absorption function, are installed before and after the planetary gear reduction mechanism, so extremely excellent impact load absorption ability is obtained, and the planetary gear reduction mechanism The mechanism will not be destroyed by impact loads.

In addition, here, overrunning clutch 1
Although the description has been made for the case where the gears 0 and 20 are mounted on the input/output rotating shaft of the planetary gear reduction gear, similar effects can be obtained by providing them in other parts, for example, inside the reduction mechanism.

As mentioned above, the drive device according to this invention is one in which a driven machine is driven by a drive motor via a reduction gear, and an overrunning clutch is provided on the drive motor side and the driven body side of the reduction gear. , the impact load generated on the drive system is alleviated and the durability of the device is improved.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of a conventional drive device of this type, and FIG. 2 is a partially sectional side view of an embodiment of this invention. In the figure, 3 and 22 are spur gears, 4 is a planetary gear,
5 is an internal gear wheel, and 10 and 20 are overrunning clutches. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims for Utility Model Registration] (1) In a device in which a driven body is driven by a drive electric motor via a speed reduction device, an overrunning clutch is arranged on the drive motor side and the driven body side of the speed reduction device, respectively. Drive device. (2) The drive device according to claim 1, wherein the speed reduction device includes a planetary gear mechanism. (3) The drive device according to claim 1 or 2, wherein the driven body is an engine.