JPS62121199A - Gearing for winch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a small and lightweight winch transmission device used for forest work and the like.

(B) Prior Art The winch as described above is used to connect cut wood or the like to the tip of a wire fed out from a drum, wind the wire, and collect the wood.

The drum must not be reversed when it is not in operation (if it is allowed to reverse, the wire will unwind freely and it is very dangerous), therefore some kind of braking device is required, but conventionally A separate brake drum was attached to the vehicle, and braking was achieved by tightening this drum.

(c) Problems that the invention attempts to solve However, if such a brake device is provided.

The amount of ffi and space will increase accordingly. In particular, since a large braking force is required, a considerably large capacity is required.

On the other hand, since such a winch used for the above-mentioned purpose must be easily portable, the larger the device, the more disadvantageous it becomes.

(d) Means for Solving the Problems Therefore, the present invention provides a winch transmission device that transmits engine power to a drum via a reduction gear, in which a clutch mechanism is provided between the output shaft of the reduction gear and the drum. At the same time, the basic configuration is that a one-way clutch is inserted in the transmission shaft relatively upstream of the reduction gear in a direction that blocks the reverse rotational force of the drum. These problems were solved by using a worm mechanism and installing the transmission shaft on which the one-way clutch was installed after the worm wheel.

(e) Effect As a result, the rotation of the drum is adjusted to a suitable rotation speed by the reducer and transmitted, and its activation and
Stopping can be freely controlled using a clutch mechanism.

Also, the one-way clutch blocks the reverse rotational force from the drum at this part, acting as a brake. In this case, since this one-way clutch is inserted relatively upstream of the transmission system, a one with a small capacity is sufficient.

(F) EXAMPLE The present invention will be described 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, the winch has engine 2 on top of frame 1.
A drum case 4 is installed above the speed reducer 3, and a drum 5 is rotatably provided within the drum case 4 so that its upper half can be seen. .

Next is the transmission system from the engine 2 to the drum 5.
This is configured as follows.

Although there are various types of speed reducer 3, one using a worm mechanism 8 consisting of a worm 6 and a worm wheel 7 will be described here. In other words, the worm 6 is connected to the engine 2.
The worm wheel 7 is connected to the output shaft (not shown) of the reducer 3, and the worm wheel 7 is tightly fitted to the output shaft 9 of the reducer 3.

Then, a clutch mechanism 10 is inserted into this output shaft 9 and connected to the drum 5.

The clutch mechanism 10 has a pinion gear 1 on the output shaft 9.
1, the pinion gear 11 is meshed with the internal gear 13 loosely fitted on the output shaft 9 via the MW gear 12 loosely fitted on the output shaft 9, and the internal gear 13 is braked appropriately, thereby forming a planetary gear. It uses a planetary mechanism structure that changes the rotation speed of 12 rotations. Then, the sprocket 14 is fixed to the planetary gear 12, and the sprocket 1 is fixed to the drum 5 with a check 715.
6 (at this time, the number of teeth of the sprocket 16 on the drum 5 side is larger than the number of teeth on the sprocket 14 on the planetary gear 12 side, so that the speed is also reduced here). A boo IJ 17 is fixed to the internal gear 13, and this rotational force is transmitted by a belt 18 to a clutch pulley 20 loosely fitted to a drum shaft 19 that freely supports the drum 5, and a brake installed on this clutch pulley 20. By operating mechanism 21.

The rotational speed of the drum 5 is controlled by adjusting the rotational force of the pulley 17 (internal gear 13).

By the way, in this invention, one or more clutch mechanisms 10
In addition to providing a transmission shaft (in this example, the output shaft 9 is used, which is located on the relatively upstream side of the reducer 3, that is, the part where the rotation speed is relatively high, the above-mentioned two Since there is a speed reduction mechanism consisting of Subroquesoles 14 and 16, a one-way clutch 22 is inserted at this position (which can be said to be on the upstream side) to block reverse rotation from the drum 5 side. If the worm mechanism 8 as in this example is used as the deceleration ta3, the one-way clutch 22 is installed at least downstream of the worm wheel 7.

As described above, if the wire 23 wound around the drum 5 is let out and a towed object such as a piece of wood is tied to the tip thereof, the towed object can be drawn by winding up the wire 23. At this time, the clutch mechanism 10
Even when the rotation of the drum 5 is stopped by cutting off the rotation of the drum 5, the reversal force derived from the towed object is blocked by the one-way clutch 22 inserted in the transmission system.
It does not reach the point of reversal.

(G) Effects of the Invention Since this invention is as described above, the following effects can be expected.

First, simply by inserting the one-way clutch 22 into the transmission shaft on the relatively upstream side of the reducer 3 installed in the power system,
Since the brake is used to prevent reverse force, the large-scale brake equipment used in the past is no longer needed. Therefore, a cheap and lightweight liner can be produced. Particularly in this case, if the one-way clutch 22 is provided on the upstream side of a power system that rotates at a relatively high speed, it may have a small capacity, which further contributes to reduction in size and weight.

Next, a case where a worm mechanism 8 is used as the reducer 3 (since it is possible to achieve large deceleration with a simple structure, it is often used as a small-space, inexpensive speed reducer).

The driving force from the worm wheel 7 side in the opposite direction is blocked by the worm 6, but if it is worn out, it will slip and become useless as a brake. However, if this one-way clutch 22 is inserted after the worm wheel 7, the reverse rotational force will be completely cut off. Incidentally, with this configuration, since the rotational force of the worm wheel 7 is not applied to the worm 6, the worm lJi structure 8 itself is in a favorable state.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of this winch, and FIG. 2 is a sectional view of the transmission system. (sign)

Claims (2)

[Claims] (1) In a winch transmission device that transmits power from an engine (2) to a drum (5) via a reducer (3),
A clutch mechanism (10) is inserted between the output shaft (9) of the reduction gear (3) and the drum (5), and a one-way clutch (
22) is inserted in a direction that blocks reverse rotational force of the drum (5). (2) A worm mechanism (8) is used as the reducer (3), and the transmission shaft to which the one-way clutch (22) is installed is installed after the worm wheel (7). The winch transmission device described in (1).