JPH05132292A - Winch for civil engineering and construction machinery - Google Patents

Abstract

PURPOSE:To attain miniaturization and large output by rotatively outside fitting a belt-like endless external gear having flexibility and less number of teeth than that of a first internal gear on the outer circumference of a rotary body through a bearing and engaging the teeth on the outer circumference of the external gear, which are positioned on each opposite side centering an output shaft, with the first internal gear. CONSTITUTION:A first internal gear 21 is fixed in a frame 10 and the center of an elliptic rotary body 22 is fixed on an output shaft 15 of a winch driving motor coaxial with the first internal gear 27. A belt-like endless external gear 25 having flexibility and less number of teeth than that of the first internal gear 27 is outside fitted on the outer circumference of the rotary body 22 through a bearing 24 and the teeth on the outer circumference of the external gear 25, which are positioned on each opposite side centering the output shaft 15, are engaged with the first internal gear 27. A drum 2 of winch is mounted on the frame 10 of the winch through bearings 18 and a second internal gear 29 having the same number of teeth as the external gear 25 and being connected to the drum 2 is engaged with the external gear 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winch mainly used for hanging loads in civil engineering construction machines or for elevating work tools or working devices, and more particularly to a small-sized and high-output structure thereof.

[0002]

2. Description of the Related Art FIG. 3 is a longitudinal sectional view showing the structure of a conventional winch for civil engineering construction machines. In FIG. 3, reference numeral 1 is a drive motor, 2 is a winch drum around which a wire rope is wound, and the output of the motor 1 is a first-stage speed reduction mechanism 3, a second-stage speed reduction mechanism 4, and a third-stage speed reduction gear. Mechanism 5, fourth
It has a structure in which it is transmitted to the drum 2 via the step reduction mechanism 6 and obtains a reduction ratio of about 1: 140, for example.
In addition to this, there is also one that uses a planetary gear to decelerate.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As shown in FIG.
The conventional winch has a problem that a high reduction ratio is obtained by gears and a multi-stage reduction mechanism is required to obtain a large output, which makes the reduction gear bulky and difficult to downsize. Further, even in the case of a speed reducer using a planetary gear, the planetary gear cannot be made too small due to the strength of the teeth of the planetary gear, so a reduction ratio of only about 1: 9 can be obtained, and a high reduction ratio can be obtained. It is difficult to obtain a small, high-powered one that is difficult to obtain.

In view of the above problems, it is an object of the present invention to provide a winch for civil engineering construction machines having a structure capable of achieving downsizing and high output.

[0005]

To achieve this object, the present invention secures a first internal gear to a winch frame or a member integral with the winch frame, and provides the same structure as the first internal gear. An elliptical or elliptical rotating body is attached to the output shaft of the winch drive motor set as the core with its center fixed to the output shaft, and has flexibility and has the first internal gear. An endless belt-shaped external gear having a number of teeth smaller than the number of teeth is rotatably fitted around the outer periphery of the rotating body via a bearing, and the external gear is opposed to each other about the output shaft. Side outer peripheral teeth are meshed with the first internal gear, a winch drum is rotatably attached to the winch frame via a bearing, and a second number of teeth equal to that of the external gear is provided. The internal gear is meshed with the external gear, and the second gear
The internal gear of is connected to the drum of the winch concentrically.

[0006]

The winch of the present invention has the above-mentioned structure, and by rotating the elliptical rotating body by the motor, the teeth of the external gear having flexibility are opposed to each other about the motor output shaft. The portion that becomes the side is pressed against the teeth of the first internal gear and meshes, and the meshing point moves in the circumferential direction along with the rotation of the rotating body, and per rotation of the rotating body (the external gear and the first gear The external gear rotates in the direction opposite to the motor output shaft by the number of rotations of the difference in the number of teeth from the internal gear / the number of teeth of the first internal gear), and the second internal gear accordingly. And the drum connected to it rotates at the same speed as the external gear.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a longitudinal half sectional view showing an embodiment of a winch for civil engineering construction machines according to the present invention, and FIG. 2 is a sectional view taken along the axis perpendicular to the axis of the present embodiment. 1 is an electric motor for driving a winch, and the electric motor 1 is fixed to a frame 10 of the winch with bolts 11. 13 is frame 1
0 is a case fixed by a bolt 14, and an output shaft 15 of the electric motor 1 is rotatably supported by a case 16 in the case 13.

Reference numeral 2 denotes a drum rotatably supported on the frame 10 via a bearing 18, 19 denotes a wire rope wound around the drum 18, and the following structure is provided between the drum 2 and the output shaft 15. A speed reducer 20 having the same is provided.

Reference numeral 22 denotes an elliptical or oval rotary body in which a center mounting hole is fitted to the output shaft 15 via a rotation stop key 23, and a bearing 24 is provided on the outer periphery of the rotary body 22 via a bearing 24.
An external gear 25 made of a thin iron plate or the like in the form of an endless belt is externally fitted.

Reference numeral 27 denotes a first internal gear which is fixed to the frame 10 or the case 13 which is integral with the frame 10 by a bolt 28 so as to be concentric with the output shaft 15,
The first internal gear 27 has, for example, two more teeth than the external gear 25. In the first internal gear 27,
The outer teeth of the external gear 25 on the opposite sides of the output shaft 15 are engaged with each other.

Reference numeral 29 denotes a second internal gear that is attached to the end surface of the drum 2 concentrically with the drum 2 by a bolt 31, and the second internal gear 29 has the same number of teeth as the external gear 25. Has a number and meshes with the external gear 25.

Reference numeral 35 is an electromagnetic brake. The electromagnetic brake 35 is pressed against a brake disc 36 fitted on the output shaft 15 by a brake shoe 39 by a pressing spring 40 when a coil 38 of the electromagnetic brake is not energized. When the coil 38 is energized and the coil 38 is energized, the brake shoe 39 separates from the brake disc 36 and the brake is released.

In this structure, when the output shaft 15 is rotated by the electric motor 1, the rotary body 22 rotates together with the output shaft 15, and the external gear 25 having flexibility is provided at both ends of the rotary body 22 via the bearings 24. Is pressed against the first internal gear 27. As a result, the meshing point of the external gear 25 with the first internal gear 27 rotates at the same angular velocity as the rotation of the output shaft 15. Here, if the number of teeth of the first internal gear 27 is 100 and the number of teeth of the external gear 25 is 98, the difference in the number of teeth per rotation of the output shaft 15 {(100-98) / 100} = 1 /
Rotate by 50. The second internal gear 29 is the external gear 25.
Since they have the same number of teeth, they rotate in the same direction at the same number of rotations, and the drum 2 connected to the second internal gear 29 also rotates integrally. That is, the reduction ratio is 1:50.

The speed reduction ratio is determined by the number of teeth of the first internal gear 27 and the difference between the number of teeth of the first internal gear 27 and the number of teeth of the external gear 25 for the above-mentioned reason. The thing of about 160 can be easily obtained.

[0015]

As described above, according to the present invention, a high reduction ratio can be obtained with a simple and compact structure, and a compact and large output winch can be realized. Further, when the electric motor is used as a winch drive motor, a relatively efficient small motor having a high rotation speed of, for example, about 4000 rpm can be used, and a winch with high efficiency can be realized as a whole. Moreover, since a high reduction ratio can be obtained, a small brake can be used. Further, by using two sets of reduction gears on both sides of the output shaft of the motor, it becomes possible to easily provide a plurality of sets of drums having the same or different reduction ratios.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a winch according to the present invention.

FIG. 2 is a sectional view taken along a plane perpendicular to the output, showing the structure of a gear used in a winch according to the present invention.

FIG. 3 is a cross-sectional view showing a structure of a conventional winch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric motor 2 Drum 10 Frame 13 Case 15 Output shaft 16, 18, 24 Bearing 20 Reduction gear 22 Rotating body 25 External gear 27 First internal gear 29 Second internal gear

Claims (1)

[Claims] 1. A first internal gear is fixed to a winch frame or a member integrated with the winch frame, and an elliptical shape is formed on an output shaft of a winch drive motor which is concentric with the first internal gear. Alternatively, an elliptical rotating body is fixedly attached to the output shaft at its center, and is flexible and has an endless belt-like external tooth having a number of teeth smaller than that of the first internal gear. A gear is rotatably fitted to the outer circumference of the rotating body via a bearing, and teeth of outer circumferences opposite to each other of the external gear about the output shaft are used as the first internal gear. Let it mesh,
A winch drum is rotatably mounted on a frame of the winch via a bearing, a second internal gear having the same number of teeth as the external gear is meshed with the external gear, and the second internal gear is engaged. A winch for civil engineering construction machines, wherein a gear is concentrically connected to the drum of the winch.