JPS6054539B2 - gear switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gear switching device, and more specifically, to changing the rotational speed of an output gear by selectively meshing the meshing gears of a reduction gear group consisting of a large number of gears and transmitting rotation to the output gear. The present invention relates to a gear switching device configured to do so.

Conventionally, as shown in FIG. 1, such a gear switching device rotates a plurality of reduction gear groups 1 that mesh with each other by a pinion 3 of a motor 2, and rotates together with a connecting gear 5 that meshes with an output gear 4. There is a method in which a slide gear is provided on the spline shaft 6 and the rotation speed of the output gear 4 is changed by meshing the slide gear 7 with one of the reduction gears a to d of the reduction gear group 1.

However, if the number of teeth of the reduction gears a to d is different, the gear diameters will be uneven, causing problems in that the slide gear 7 cannot be moved smoothly and cannot be properly engaged with the reduction gears a to d. Ta.

To solve this problem, there is a method of moving the slide gear 7 by pulling it as shown by the arrow in FIG. 1 and tilting the tip of the spline shaft 6 to disengage the slide gear 7 from the reduction gears a-d. However, if the diameters of the reduction gears a to d are uneven, the distance between the shafts of each gear shaft and the parallelism of the shafts will not be maintained sufficiently, resulting in various problems. I couldn't solve the problem.

The present invention has been made in order to solve the above-mentioned conventional problems, and the present invention is made by disengaging the slide gear from the reduction gear by swinging an arm, and by making the slide gear movable up and down by an elevating support member. It is an object of the present invention to provide a gear switching device that can simultaneously switch the slide gear and the reduction gear in one operation without any hindrance. Next, the present invention will be explained based on examples.

FIG. 2 shows the application of the present invention to a time-limited relay,
Reference numeral 10 denotes a group of reduction gears, which are conventionally known gears that mesh with output gears of a motor (not shown) and rotate, respectively.

11 is a first output gear; 12 is a second output gear that meshes with a conventionally known cam gear 14 for time setting;
The saw body is rotatably attached to a gear shaft 13 which is provided upright by a clutch 16 which is brought into contact with and released from the gear shaft 13 by means not shown.

Reference numeral 17 denotes two support plates 1 that swing around the gear shaft 13.
The arm is made up of 8 and 18 pieces.

Reference numeral 19 denotes a spline shaft having a cross-shaped cross section, whose upper and lower ends are rotatably supported at the tip of the arm 17, and the lower end of which is rotatably supported by the first shaft.
It has a connecting gear 20 that constantly meshes with the output gear 11, and a slide gear 21 that meshes with any one of the reduction gears a to e of the reduction gear group 10 and is provided to be movable up and down.

Reference numeral 22 denotes an elevating support member having a forked portion 23 at its tip that holds the slide gear 21 from above and below, and is slidable on a guide column 32 erected on the base, and is threadedly engaged with a screw 33 having a gear 34 at its upper end. are doing.

On the other hand, 35 has a hexagonal hole 36 at the upper end and a cam 37 at the lower end.
The gear 35 meshes with the gear 34, and the cam 37 engages with a protrusion 38 provided on the lower surface of the tip of the arm 17.
, the cam 37, the screw 33, and the protrusion 38 constitute a vertical position adjustment means 28. The switching gear 35 is attached to a base or a case (not shown) as appropriate, and 25 is a notch, and 39 is a notch that connects the arm 17 to the reduction gear group 1.
This is a spring that biases toward zero.

Next, the operation and switching method of the gear switching device having the above configuration will be explained.

First, in the illustrated state, the rotation of the motor is . - The rotation is transmitted to the reduction gear group 10, and the rotation is transmitted to the slide gear 21 by the reduction gear a.

Further, the rotation of the slide gear 21 is transmitted to the first and second output gears 11 and 12 by the connection gear 20, and the rotation of the slide gear 21 is transmitted to the first and second output gears 11 and 12.
Rotate. Then, when the cam gear 14 rotates a predetermined amount (
After the set time elapses), a cam (not shown) provided at the bottom activates a time-limiting contact in a conventionally known manner, and the time is up, turning the predetermined circuit ON and OFF, and actuating the clutch 16 to shift the second output gear. 12.

Now, to change the set time, press the slide gear 21.
The reduction ratio can be increased or decreased by changing the engagement with the reduction gear a.

That is, to switch the slide gear 21, when the switching gear 35 is rotated in the direction of arrow B using, for example, a hexagonal wrench, the protrusion 38 is moved by the cam 37, and the slide gear 21 engages the reduction gear a. (with cancellation)
When the screw 33 rotates, the elevating support member 22 descends, and the cam 37 rotates one pitch, the arm 17 returns to its original state and the slide gear 21 meshes with the reduction gear b one step lower. Furthermore, if the switching gear 35 is moved in the opposite direction, the lifting/lowering support member 22 moves upward. It goes without saying that by rotating the switching gear 35 by two pitches, the slide gear 21 can be brought into mesh with the reduction gear located two steps above and below. In this way, the reduction gear can be switched in one operation.

As is clear from the above description, according to the gear switching device according to the present invention, the slide gear can be disengaged from the reduction gear by swinging the arm, and the lifting support member and the vertical position adjustment means can be disengaged from each other. Since the gears can be moved up and down, even if the diameters of the reduction gears are different, the gears can be changed without causing any hindrance to the rotation of other members or gears.

Moreover, it has the advantage that the swinging of the arm and the vertical position adjustment can be performed by one operation of rotating the switching gear. In the above description, the case where the present invention is applied to an electromagnetic relay has been described, but the present invention is not limited to this, and it goes without saying that the rotational force may be directly extracted from the first output gear.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a conventional gear switching device, FIG. 2 is a front view of the gear switching device according to the present invention, and FIG. 3 is a plan view thereof. 10... Reduction gear group, a-f... Reduction gear, 11.
... Output gear, 13... Output gear group, 17... Arm, 19... Spline shaft, 20... Connection gear, 2
1... Slide gear, 22... Lifting support member, 28
...Position adjustment means, 32...Guiding column, 33...
Screw, 34=Y, 35...Switching gear, 37...
・Cam, 38...protrusion.

Claims (1)

[Claims] 1. A gear switching device that changes the rotational speed of an output gear by moving a slide gear to mesh with a predetermined gear of a group of reduction gears, which has a large number of rotatably mounted gears that mesh with each other on parallel shafts, an arm that is swingable about an output gear shaft; a slide gear that is vertically movably attached to a rotatable spline shaft attached to the arm and meshes with one of the predetermined gears of the reduction gear group; A connecting gear that is attached to the spline shaft and meshes with the output gear, and a lifting support member that holds the upper and lower parts of the slide gear and moves up and down to position the slide gear at a predetermined position, are engaged by rotation to move the arm. A switching gear equipped with a cam that swings to release the engagement between the slide gear and the reduction gear; and a switching gear that engages with the gear and is threadedly engaged with the lifting support member, and moves the lifting support member up and down by rotation of the switching gear. 1. A gear switching device comprising: a screw for adjusting the vertical position;