JPH0748093A - Reduction gear box for hoisting machine - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a reduction gear box in which grease does not easily scatter, and the enclosed grease easily circulates according to the rotation of the gear, and further the grease is accumulated in the surroundings. [Composition] In a reduction gear box of a hoisting machine, the first small gear and the first large gear, the second large gear, and the third large gear of the reduction gear train have an inner shape along the outer diameters of the first small gear and the first small gear. A gearbox for a hoisting machine that has a grease reservoir in the gear.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reduction gear box shape suitable for grease lubrication of a reduction gear train of a hoisting machine.

[0002]

2. Description of the Related Art A conventional reduction gear box of a hoist has a configuration as shown in FIG.
In the portion of the small gear 2, the gear cover 10 is formed so as to cover the outer circumference, but the outer circumference of the first small gear 11 and the inner circumference of the gear cover 10 have a relatively large gap, and only a part of the outer circumference of the small gear 11 is covered. Since it is not present, the grease scattered from the small gear 11 due to the high speed rotation during operation remains attached to the inner wall of the gear case, which makes the grease difficult to circulate.

[0003]

As described above, according to the prior art, the conventional technique has a problem that grease is likely to be scattered and is difficult to circulate, and the first pinion gear is likely to run out of grease. In view of this problem, the present invention makes it difficult for grease to scatter, and the enclosed grease facilitates circulation according to the rotation of the gear,
Another object of the present invention is to provide a reduction gear box in which grease is accumulated in the surroundings.

[0004]

In order to achieve the above-mentioned object, the present invention changes the shape of the gear cover 10 to the first pinion 1
1 and a separate cover for covering a part of the outer circumference of the first large gear 14 is provided so that the space with the original gear cover serves as a grease reservoir to reduce grease scattering and grease circulation. To improve the

[0005]

According to the present invention, it is possible to prevent abnormal wear of the first small gear of the reduction gear train of the hoisting machine due to running out of grease.

[0006]

Embodiments of the present invention will be described with reference to the drawings. Figure 1
Shows the structure of the hoisting machine.

Reference numeral 1 denotes an electric motor which is operated by pressing a push button switch 2. One end of the rotor 3 is connected to the reduction gear train 4, and the sprocket 5 is connected to the final stage of the gear train 4 in principle. A load chain 6 is wound around the sprocket 5, and a hook 7 for hanging a load is attached to one end of the sprocket 5. Reference numeral 8 is for holding a load suspended by an electromagnetic brake in a suspended state, and the braking force is released by an electromagnet 9. A gear cover 10 is configured to cover the periphery of the gear train 4 so that the lubricating grease of the reduction gear train 4 does not flow out. To explain the operation in such a configuration, when the push button switch 2 is pushed, the electric power is supplied to the electric motor 1 and the electromagnet 9, and the rotor 3 is rotated in the same manner as when the electromagnetic brake 8 is released. This is a machine that moves the load chains 6 up and down to carry the load up and down.

FIG. 2 shows the structure of the reduction gear train of the present invention. 1st small gear 11, 1st large gear 12, 2nd large gear 13, 3rd
The gear cover 1 so as to surround the outer circumference of each gear 14
0 is set. As for the rotation of the gear, the first small gear 11 is rotated at the highest speed. Grease is filled in the meshing part of each gear to lubricate the gear. The first small gear 11 portion of the gear cover 10 has an inner cover 13 having a reduced outer diameter and a small gap, and the both ends of the inner cover 13 extend so as to partially cover the outer periphery of the first large gear 12 as shown in the figure.
5 and 16 are provided, and the central portion includes the gear cover 10 and the connecting wall 1.
7 and 18 are provided. With this configuration,
The grease sent by the first small gear 11 and the first large gear 12 is again supplied to the first large gear 12 after passing through the inner wall of the inner cover 13, and the surplus portion is connected to the gear cover 10 and the inner cover 13, the overhang 16, and the connection. It is stored in the space surrounded by the wall 18. The grease sent by the third large gear 14 and the third small gear 19 is sent to the first large gear 12, and the surplus is stored in the space surrounded by the inner cover 13, the gear cover 10, and the connecting wall 17. The accumulated grease is sequentially supplied to the first large gear 12. In this way, by repeating the operation, the lubricating grease circulates toward the first large gear 12, and in particular, the grease scattering of the first small gear 11 that rotates at a high speed is reduced, and the grease runs out. It has the effect of reducing abnormal wear.

[0009]

Since the present invention is constructed as described above, the following effects can be obtained.

1. Lubricating grease of the first large gear rotating at high speed is less likely to be scattered.

2. The lubricating grease is circulated toward the first large gear during operation.

Therefore, abnormal wear due to running out of grease on the first small gear can be reduced.

[Brief description of drawings]

FIG. 1 is a structural diagram of a hoisting machine.

FIG. 2 is a configuration diagram of a reduction gear train of the present invention.

FIG. 3 is a configuration diagram of a conventional reduction gear train.

[Explanation of symbols]

1 ... Electric motor, 2 ... Pushbutton switch, 3 ... Rotor, 4 ...
Reduction gear train, 5 ... sprocket, 6 ... load chain, 7 ... hook, 8 ... electromagnetic brake, 9 ... electromagnet, 10 ... gear cover.

Claims (1)

[Claims] 1. A reduction gear box of a hoisting machine, wherein the first small gear, the first large gear, the second large gear, and the third large gear of the reduction gear train have an inner shape along the outer diameter, A reduction gear box for a hoisting machine, characterized in that a grease reservoir is formed in the first small gear portion.