JPH021348Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a winch used for lifting or pulling heavy objects.

[Prior Art] FIG. 5 is a front view schematically showing a winding drum portion of a conventional endless type winch. In FIG. 5, a groove 1a is formed around the winding drum 1, and a rope 2 is fitted into the groove 1a. FIG. 4 is shown to explain the cross-sectional shape of the groove 1a. As shown in FIG. 4, the groove 1a
It has a V-shaped cross-sectional shape whose width gradually narrows toward the inside in the radial direction. Therefore, when the rope 2 is pressed against the groove 1a from the outside in the radial direction to the inside, it is pinched by the side walls on both sides of the groove 1a, and slipping is prevented.

Here, the explanation will be given again by returning to FIG. rope 2
The guide roller 5 passes around the winding drum 1 along the groove 1a as described above and is provided on the exit side.
and the groove 1a.

When pulling up a heavy object, a force is applied to the rope 2 in the groove 1a due to the weight of the heavy object so as to bite into the groove 1a. However, the force of this heavy object alone is not sufficient to prevent the rope from slipping, and in many cases, presser rollers 3 and 4 as shown in FIG. 5 are provided at appropriate locations around the winding drum 1.

The press rollers 3 and 4 are arranged with a predetermined gap between them and the groove so as to push the rope 2 into the groove 1a. In conventional winches, such a presser roller is provided to prevent the rope from slipping in the groove of the winding drum.

[Problems to be Solved by the Invention] However, since it is necessary to provide such a presser roller in the conventional winch, there is a problem in that the entire device becomes large in size. Furthermore, when ropes with different diameters are used, the distance between the rope and the presser roller changes, so that the presser roller may not be sufficiently effective in preventing slips.

There is also a method to prevent slipping by wrapping the rope twice, for example, to make the wrapping angle more than 360° and biting the rope into the groove, without using a presser roller. The overall size of the device has increased due to the increased size and complicated structure.

Therefore, the purpose of this invention is to provide a winch that can more effectively prevent slips between the rope and the groove of the winding drum than before, without increasing the size of the entire device. .

[Means for Solving the Problems] In the winch of this invention, the winding drum is divided into a driving disk portion and a driven disk portion. Further, the groove into which the rope is fitted is formed by arranging the drive disk part and the driven disk part facing each other, one side wall of the groove is made up of the side surface of the drive disk part, and the other side wall is made up of the side wall of the driven disk part. Consists of the sides of the section. The driving disc part and the driven disc part are screwed together, and when the driving disc part is rotated in the direction of winding up the rope, the driven disc part moves toward the driving disc part and narrows the width of the groove. They are screwed together.

[Function] In the winch of this invention, the driving disc part and the driven disc part are screwed together, and when the driving disc part is rotated in the direction to wind up the rope, the driven disc part moves toward the driving disc part. to narrow the groove width. Therefore, when winding up the rope, the rope is sandwiched between the side walls on both sides of the groove, and slippage between the rope and the groove is effectively prevented.

[Embodiment] FIG. 1 is a partially cutaway sectional view showing an embodiment of this invention. A motor 10 is attached to the upper left side of the winch shown in FIG. 1, and a rotating shaft 11 of the motor 10 is connected to a shaft 13 within a coupling 12b. ing. In FIG. 1, the one-way clutch 12a is shown in a simplified manner. Note that the one-way clutch 12a does not perform a braking action when pulling up the rope, but only performs a braking action when lowering the rope. The tip 13a of the shaft 13 has a tapered diameter and is supported by a ball bearing 35. Ball bearing 35 is attached to gear case 39.

A gear portion 14 is formed near the tip 13a of the shaft 13. The gear portion 14 is the gear 1
It is meshed with the larger gear number 5. Gear 15 is supported by shaft 20 via a needle bearing. One end 20a of the shaft 20
is supported by a ball bearing 36. Ball bearing 36 is attached to gear case 39. The other end 20b of the shaft 20
is supported by the sheave case 37 via a needle bearing.

The gears 15 to 18 are each constructed by combining a large gear and a small gear. gear 16
and 18 are each supported by the shaft 13 via a needle bearing, and the gear 15 and the gear 17 are each supported by the shaft 20 via a needle bearing. The smaller gear of gear 15 meshes with the larger gear of gear 16, and the smaller gear of gear 16 meshes with the larger gear of gear 17. The smaller gear of gear 17 is meshed with the larger gear of gear 18, and the smaller gear of gear 18 is meshed with gear 19.
Is the gear 19 integrally molded with the shaft 20?
Alternatively, the shaft 20 may be fixedly attached, and the rotation of the gear 19 causes the shaft 20 to rotate. A central portion of the shaft 20 is supported by a sheave case 38 via a needle bearing. Shaft 20
A keyway is formed between the center portion and the other end 20b, and a key 23 is fitted into this keyway. The key 23 is engaged with a gear 24 mounted around it, and the gear 24 rotates integrally with the shaft 20.

FIG. 3 is a sectional view taken along the - line in FIG. 1. Here, the explanation will be made with reference to FIG. 3 as well. A gear 24 provided around the shaft 20 meshes with an internal gear formed inside a drive disk portion 27 located outside thereof, and rotation of the gear 24 causes the drive disk portion 27 to rotate. A driven disk portion 28 is supported by the driving disk portion 27 via steel balls 32 for ball bearings. The driving disk portion 27 and the driven disk portion 28 are each formed with a flange-like portion extending outward, and the driving disk portion 27 and the driven disk portion 28 are formed such that the flange-like portions are combined to form a groove. The driven disk portions 28 are arranged to face each other.

FIG. 2 is an enlarged sectional view showing the driving disk portion and the driven disk portion of the embodiment of FIG. 1. Side surface 27b of the flange-shaped portion of the drive disk portion 27
and the side surface 28b of the flange-like portion of the driven disk portion 28, in which a rope 40, as shown in phantom lines, is positioned in use. The driving disk section 27 and the driven disk section 28 include
Screw portions 27a and 28a are formed respectively, and the drive disk portion 27 and the driven disk portion 28 are combined by engaging the screw portions 27a and 28a. Screwed parts 27a, 28
The thread a is formed in such a direction that the driven disc part 28 moves toward the driving disc part 27 when the driving disc part 27 rotates in the direction to wind up the rope. In FIG. 2, 27c indicates an internal tooth portion that meshes with the gear 24.

Now, referring back to FIGS. 1 and 3, the configuration of other parts will be explained. Drive disk section 27
are rotatably supported by sheave cases 37 and 38 by ball bearings 33 and 34, respectively. In the lower part of the groove formed by the drive disc part 27 and the driven disc part 28,
A guide plate 29 is attached, and the guide plate 2
9 cooperates with the guide roller 41 to guide the feeding of the rope. Note that the guide roller 41 is rotatably supported by a guide roller shaft 42.

The limit plate 31 is the limit shaft 43
The rope 40 passes through a hole formed in the limit plate 31. Therefore, if something larger than the diameter of the rope is attached to the rope, it will hit the hole in the limit plate 31 and the limit plate will tilt, causing the limit shaft 43 to rotate. This rotation of the limit shaft 43 activates a limit mechanism provided in the limit case 30, and stops winding the rope.

When winding up the rope, the rotating shaft 11 of the motor 10 rotates, and the shaft 13 connected to the rotating shaft 11 also rotates. At this time, the one-way clutch 12a is
Does not indicate braking action. As the shaft 13 rotates, a gear portion 14 provided at its tip rotates, and the larger gear of the gears 15 meshed with the gear 14 rotates. This rotation is transmitted to gear 19 via gear 16, gear 17, and gear 18 at a reduced speed. Rotation of gear 19 causes shaft 20 to rotate, and gear 24 mounted around shaft 20 to rotate.

As the gear 24 rotates, the drive disk portion 27 whose internal teeth mesh with the gear 24 rotates clockwise in FIG. 3. The driven disk portion 28 is connected to the drive disk portion 27 by screwing portions 28a and 27a.
Since the drive disk part 27 rotates clockwise to wind up the rope, the entire driven disk part 28 moves toward the drive disk part 27 side. Due to this movement, the rope 40 located between the side surface 27b of the driving disk section and the side surface 28b of the driven disk section is strongly pinched by the driving disk section 27 and the driven disk section 28, so that the rope 40 does not slip. is rolled up.

When lowering the rope, the driven disk portion 28 tends to rotate counterclockwise in FIG. 3 due to the heavy object attached to the rope. When the driven disk portion 28 rotates counterclockwise, the drive disk portion 27 rotates clockwise in a relative manner, so that the driven disk portion 2
8 moves closer to the drive disk portion 27 and firmly pinches the rope 40. Therefore, not only when hoisting up the rope, but also when lowering the rope,
The driving disk portion 27 and the driven disk portion 28 act to sandwich the rope, and slipping of the rope is effectively prevented. At this time, since the one-way clutch 12a performs a braking operation, the rotation of the shaft 13 is controlled, and the rotation of the drive disk portion 27 is also controlled. Therefore, when the rope is lowered, the heavy object attached to the rope will not fall suddenly.

In this embodiment, a speed reduction mechanism that combines a large number of gears is provided, but such a speed reduction mechanism is not essential to this invention. Furthermore, it goes without saying that the shapes and structures of the driving disk section and the driven disk section are not limited to those of this embodiment.

[Effects of the invention] As explained above, the winch of this invention works so that the width of the groove into which the rope is fitted is narrowed when the rope is hoisted or unwound. Therefore, the rope is strongly held in this groove, and slipping of the rope is more effectively prevented than before. Furthermore, the heavier the object, the stronger the grip on the rope.

In addition, since the winch of this invention does not require a holding plate unlike the conventional one, the entire device can be made smaller. Furthermore, in the winch of this invention, since the groove into which the rope is fitted can change depending on the diameter of the rope, ropes of different diameters can be used without any problem.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional view showing an embodiment of this invention. FIG. 2 is an enlarged sectional view showing the driving disk portion and the driven disk portion of the embodiment of FIG. 1. FIG. 3 is a sectional view taken along the - line in FIG. 1. FIG. 4 is a partial sectional view showing grooves in the winding drum portion of a conventional winch. FIG. 5 is a front view showing the winding drum portion of a conventional winch. In the figure, 27 is a drive disk part, 28 is a driven disk part, 27a, 28a are screw parts, 27
b, 28b are side surfaces, and 40 is a rope.

Claims (1)

[Claims for Utility Model Registration] A winch that winds up the rope by passing a rope through a groove formed along the periphery of the winding drum, fitting the rope into the groove, and rotating the winding drum, the winch comprising: A driving disk portion and a driven disk portion are provided, and the driving disk portion and the driven disk portion are arranged such that one side wall of the groove is formed from a side surface of the driving disk portion, and the other side wall is formed from a side surface of the driven disk portion. The driving disc part and the driven disc part are screwed together so that they face each other and when the driving disc part is rotated in a direction to wind up the rope, the driven disc part moves toward the driving disc part and narrows the width of the groove. A winch characterized by: