JPH038709Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a small and lightweight winch drum rotation control device used for forest work, etc.

(B) Prior art The winch described above is used to connect cut wood, etc. to the tip of a wire fed out from a drum, wind the wire, and collect the wood.
In order to perform these operations smoothly, it is necessary to be able to start and stop the rotation of the drum, or to adjust its speed as appropriate.

For this reason, conventionally, a transmission structure as shown in FIG. 3 has been adopted.

That is, an appropriate speed reduction device (here, a worm speed reduction mechanism consisting of a worm 3 and a worm wheel 4) 5 is inserted in the power system extending from the engine 1 to the drum 2, and a drum rotation control device 6 is installed after this speed reduction device 5. It is installed.

The drum rotation control device 6 (hereinafter referred to as the control device 6) includes a pinion gear 8 that is tightly fitted to the transmission shaft 7 of the reduction gear 5.
is engaged with an internal gear 10 which is also loosely fitted to the transmission shaft 7 via a planetary gear 9 which is loosely fitted to the transmission shaft 7, and the rotational speed of the planetary gear 9 is changed by appropriately braking this internal gear 10. The structure of the formula is adopted. Then, the sprocket 11 is fixed to the planetary gear 9,
Sprocket 1 fixed to drum 2 with chain 12
3. Further, a pulley 14 is fixed to the internal gear 10, and this rotational force is transmitted by a belt 15 to a clutch pulley 17 loosely fitted to a drum shaft 16 that freely supports the drum 2, and a brake installed on this clutch pulley 17. 18, the rotational force of the pulley 14 (internal gear 10) is adjusted to control the rotational speed of the drum 2.

(c) Problems to be solved by the invention However, with this configuration, the entire control device cannot be accommodated in the reduction gear due to its nature, so lubrication, etc. is inevitably insufficient, resulting in wear, etc. I was early.

Furthermore, this exposes the rotating object, which is dangerous, and also increases space and weight.

(d) Means for solving the problems In order to solve these problems, this invention consists of a bevel gear type differential gear device and a brake that tightens the control wheel connected to this bevel gear type differential gear device. A drum rotation speed control device is constructed by the control device shown in FIG.

(E) Effect This allows the control device to be configured with a bevel gear type differential gear device, so these can be easily accommodated in the case of the reduction gear device, and the whole can be made compact. It has also become possible.

(F) Embodiments This invention will be explained below with reference to the drawings. FIG. 1 is a partially sectional front view of this winch, and FIG. 2 is a sectional view of the transmission system.

First, regarding the overall structure of the winch, a reduction gear 5 driven by the engine 1 is mounted on a frame 19, and a drum case 20 is mounted above the reduction gear 5.
The drum 2 is rotatably provided in the drum case 20 with its upper half visible.

Next, the power system from the engine 1 to the drum 2 is configured as described above, and the control device 6 is configured with the following bevel gear type differential gear device 21. .

That is, two bevel gears 22 and 23 are loosely fitted on the transmission shaft 7 of the reduction gear 5 so as to face each other, and a support shaft 24 is orthogonally passed through between these two bevel gears 22 and 23. Two bevel gears 25 and 26 are loosely fitted onto 24 so as to face each other and mesh with the two bevel gears 22 and 23. The above-mentioned sprocket 11 is firmly fitted to one end of the transmission shaft 7, and the worm wheel 4 is fixed to the bevel gear 22 of the bevel gears 22 and 23 to which the sprocket 11 is fitted. Furthermore, a control wheel 27 is fixed to the tail end of the other bevel gear 23, so that the rotation speed of this control wheel 27 can be adjusted as appropriate by operating a brake 28.

As a result, if no braking force is applied to the control wheel 27 now, the transmission shaft 7 (and therefore the drum 2) will not rotate at all since it is under load. However, when the control wheel 27 is braked and the rotational speed is dropped to a certain level, this bevel gear type differential gear device 2
Based on the principle of 1, the drop is directly applied to increase the rotation speed of the transmission shaft 7 (therefore, if the control wheel 27 is completely stopped, the transmission shaft 7 will rotate at the maximum speed). ).

(g) Effects of the invention Since this invention is as explained above, the following effects can be expected.

That is, since the bevel gear type differential gear device 21 having such a configuration is adopted as the control device 6, the four bevel gears 22, 23, 25, 26 and the support shaft 2
Most of the components such as 4 can be housed within the case of the speed reduction device 5. Therefore, sufficient lubrication etc. can be applied and it is not dangerous.

Furthermore, since such a bevel gear type differential gear device 21 is very compact, it requires only a small installation space and is light in weight. In particular, since such winches are portable, reducing their weight is extremely significant.

[Brief explanation of the drawing]

Figure 1 is a partially sectional front view of this winch, Figure 2 is a front view of this winch.
The figure is a sectional view of a transmission system, and FIG. 3 is a sectional view of a transmission system with a conventional structure. Code, 1...Engine, 2...Drum, 6...
Drum rotation control device, 7... Output shaft, 21... Bevel gear type differential gear device, 22... Bevel gear,
23... Bevel gear, 24... Support shaft, 25...
Bevel gear, 26... Bevel gear, 27... Control wheel, 28... Brake.

Claims (1)

[Scope of utility model registration request] A drum rotation control device 6 that controls the rotation of a drum 2 of a winch, in which the output of an engine 1 is connected to two bevel gears 2 that are loosely fitted in opposition to an output shaft 7.
2, 23, and a support shaft 24 perpendicular to this output shaft 7.
two bevel gears 2 that are loosely fitted in and mesh with the two bevel gears 22 and 23, respectively.
Bevel gear type differential gear device 2 consisting of 5 and 26
In addition to connecting the output shaft 7 and the drum 2 with power, a control wheel 27 is fixed to the other bevel gear 23, and this control wheel 27 is tightened with a brake 28. A winch drum rotation control device in which the speed of the output shaft 7 is increased by the deceleration of the bevel gear 23.