JPH05155589A - Winch - Google Patents

Abstract

PURPOSE:To provide a winch which can sufficiently enhance the heat radiation property of a brake drum and which does not consume energy wastefully. CONSTITUTION:A winch drum 21 is connected to a motor 22 via a planetary reduction gear 23 and a brake 25 is provided which brakes rotation of a motor output shaft 22a. The ring gear 26 of the planetary reduction gear 23 is provided integrally with the winch drum 21 and a brake drum 32 separated from the winch drum 32 is provided on a carrier shaft 27. A band brake 33 is provided around the outer peripheral side of the brake drum 32. A rib 35 is provided which extends from the boss 34 of the brake drum 32 to a portion 32a to be braked and which is in the form of a fan. Rotation of the brake drum 32 during a free fall causes rotation of the rib 35, thereby generating an air flow to cool the brake drum 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winch device suitable for heavy duty work such as a clam shell, and more particularly to a winch device capable of effectively preventing heat generation of a brake drum during a free fall. Regarding

[0002]

2. Description of the Related Art As a winch device used for a heavy duty duty clam shell or the like, a winch device 1 as shown in FIG. 3 is conventionally known. This winch device 1 controls the rotation of a winch drum 2, a hydraulic motor 3, and an output shaft 3 a of the hydraulic motor 3 to the winch drum 2.
And a planetary speed reducer 4 for decelerating and transmitting the same, and a brake drum 6 is integrally provided at an end of the winch drum 2. A clutch 7 is integrally provided on the output shaft 5 of the planetary speed reducer 4, and transmission of the rotational force from the hydraulic motor 3 to the winch drum 2 is turned on and off by the clutch 7. Also,
On the outer peripheral side of the brake drum 6, a band brake 8 that is wound around the outer periphery of the brake drum 6 and applies a braking force is arranged so that the free rotation of the winch drum 2 can be prevented. In the winch device 1 having such a configuration, the clutch 7 is pressed against the inner circumference of the brake drum 6 to connect the output shaft 5 and the brake drum 6, and the rotational braking of the brake drum 6 by the band brake 8 is released. By driving the hydraulic motor 3 in this state, the winch drum 2 can be forcibly driven by the hydraulic motor 3 to perform desired hoisting and lowering work. Further, the clutch 7 is separated from the inner circumference of the brake drum 6 so that the output shaft 5
By releasing the connection between the brake drum 6 and the brake drum 6 and releasing the braking of the brake drum 6 by the band brake 8, it is possible to obtain a so-called free-fall state in which the winch drum 2 is freely rotated by the weight of the suspended load.

By the way, in the winch device 1 having such a structure, when the band brake 8 is operated and braked during the free fall, the brake drum 6 and the band brake 8 rub to generate heat. .. This heat generation of the brake drum 6 is not a serious problem for crane work in which the load during free fall is relatively small, but the surface of the brake drum 6 is often used for clamshell work in which heavy objects such as buckets are often free fall. It is not unusual for the temperature to exceed 300 ° C., and if it is left untreated, thermal cracks may occur in the brake drum 8 and the service life may be impaired, and the braking force may be reduced.

Therefore, in the above-described conventional winch device 1, it is necessary to take some measures in order to enhance the heat dissipation of the brake drum 6. However, in the winch device 1 having the configuration shown in FIG. 3, since the clutch 7 or the band brake 8 comes into contact with and separates from the inner and outer circumferences of the brake drum 1, when the inner and outer peripheral surfaces of the brake drum 6 are provided with rainwater, The clutch 7 and the band brake 8 may slip due to the intrusion. Therefore, as means for improving the heat dissipation of the brake drum 6, for example, FIGS.
As shown in FIG. 3, a slit 9 is formed in the narrow space between the clutch 7 and the band brake 8 so as to penetrate the brake drum 6 in the axial direction, and a fan 10 is formed inside the slit 9 to rotate the brake drum 6. To generate an air flow to cool the brake drum 6, or, as shown in FIGS. 3, 7, and 8, dispose a radiating fin 11 extending in the radial direction on the outer peripheral portion of the brake drum 6 to dissipate the heat. It was common to increase If a sufficient heat radiation effect cannot be obtained by these means alone, the duct 12 is provided around the brake drum 6 as shown in FIG.
In some cases, the electric fan 13 is provided to forcibly perform the cooling.

[0005]

However, the forced cooling method using the electric fan 13 inevitably increases the size of the winch device due to the duct 12 and the like, and the increase in the number of parts makes the device complicated and causes a failure. It can be. Further, since the electric fan 13 consumes energy, the horsepower loss of the winch device 1 cannot be avoided, and it has been a factor of deteriorating the fuel economy of the machine in which the winch device 1 is mounted. On the other hand, if the cooling is performed only by the fan 10 and the heat radiation fins 11 without using the electric fan 13, since the positions where these are provided are limited to only a part of the outer circumference of the brake drum 6, a sufficient heat radiation effect is obtained. Hard to get. An object of the present invention is to provide a winch device capable of sufficiently enhancing the heat dissipation of the brake drum and without wasting energy.

[0006]

[Means for Solving the Problems] FIGS.
The present invention will be described in relation to the winch drum 21, the motor 22 that rotationally drives the winch drum 21, and the rotation of the output shaft 22a of the motor 22 that is decelerated and transmitted to the winch drum 21. The present invention is applied to a winch device including a planetary speed reducer 23, and achieves the above object by the following configuration. A first brake 25 for braking the rotation of the input shaft of the planetary speed reducer 23 is provided, and either one of the ring gear 26 and the carrier shaft 27 of the planetary speed reducer 23 is integrally provided with the winch drum 21, and the other is provided with the winch drum. 21 is provided separately from the brake drum 32, a second brake 33 for braking the rotation of the brake drum 32 is provided on the outer peripheral side of the brake drum 32, and a ring gear 26 or a carrier provided on the center side of the brake drum 32 is provided. Fitting portion 34 with shaft 27
To the braked portion 32a provided on the outer periphery of the brake drum 32, a rib 35 is formed, and the rib 35 is formed into a fan shape that generates an air flow by the rotation of the brake drum 32.

[0007]

Operation: The brake drum 3 is driven by the second brake 33.
While braking the rotation of 2, the input shaft 22a of the planetary speed reducer 23
By releasing the braking of the rotation and starting the motor 22, the winch drum 21 is driven according to the rotation of the motor 22 to perform a desired hoisting and hoisting operation. Then, by releasing the rotational braking of the brake drum 32 by the second brake 33 with the motor 22 stopped, the winch drum 21 is freely rotated and the free fall state is obtained. During this free fall, the brake drum 32 also rotates with the rotation of the winch drum 21, so that an air flow is generated by the ribs 35 of the brake drum 32.
As a result, the brake drum 32 is cooled. And
When the rotation of the brake drum 32 is braked by the second brake 33 to stop the free fall, the cooling action of the ribs 35 continues to work until the rotation of the brake drum 32 is completely stopped. Fever is prevented. In the above description, reference numerals in the accompanying drawings are cited for easy understanding, but it goes without saying that the present invention is not limited to the illustrated examples.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the winch device 20 of the present embodiment reduces the rotation of a winch drum 21, a hydraulic motor 22 that rotationally drives the winch drum 21, and an output shaft 22a of the hydraulic motor 22 to the winch drum 21. And a planetary speed reducer 23 that transmits the output power to the planetary speed reducer 2 by connecting the output shaft 22a of the hydraulic motor 22 to the sun gear 24 of the planetary speed reducer 23.
3 is used as an input shaft A wet multi-plate brake (first brake) 2 is provided at the rear end of the hydraulic motor 22.
5 is provided to permit rotation of the output shaft 22a or brake rotation of the output shaft 22a in conjunction with start and stop of the hydraulic motor 22.

The ring gear 26 of the planetary reducer 23 is integrated with the winch drum 21 and is rotatably supported by a bearing 28 fitted to a carrier shaft 27 of the planetary reducer 23. One end of the carrier shaft 27 is connected to the planetary gear 29 of the planetary speed reducer 23, and the other end of the carrier shaft 27 is fitted into the bearings 30 and 31, so that the carrier shaft 27 is rotatably supported with respect to the winch drum 21. Has been done. A brake drum 32, which is separate from the winch drum 21, is provided integrally with the carrier shaft 27 at the other end of the carrier shaft 27. A band brake (second brake device) 33 that is wound around the brake drum 32 and can brake the rotation of the brake drum 32 is provided on the outer peripheral portion of the brake drum 32. The band brake 33 is connected to a brake pedal via a link mechanism (not shown), and is manually operated by an operator appropriately depressing the brake pedal.

A boss 34 that fits with the carrier shaft 27 is provided on the center side of the brake drum 32.
The rib 35 is provided in the portion from the to the braked portion 32a that is in close contact with the band brake 33. As shown in more detail in FIG. 2, a plurality of ribs 35 (eight in the figure) are provided at equal intervals in the circumferential direction of the brake drum 32, and each shape is from one end side in the axial direction of the brake drum 32. It has a fan shape that gradually twists toward one side in the circumferential direction of the brake drum 32 as it goes to the other end side. When the brake drum 32 rotates in the same direction as the rotation direction of the winch drum 21 (the direction of arrow A in FIG. 2), the twist direction of these ribs 35 is as shown by arrow B in FIG. It is determined that an air flow is generated in the direction from the drum 21 to the brake drum 32.

Next, the winch device 2 having the above structure
The operation of 0 will be described. In order to perform hoisting of a suspended load and hoisting work by lowering power by the winch device 20 of the present embodiment,
With the band brake 33 braking the rotation of the brake drum 32 and blocking the rotation of the carrier shaft 27, the hydraulic motor 22 is activated to rotate the sun gear 24 in a desired direction. As a result, the ring gear 26 rotates, the winch drum 21 rotates in a desired direction, and hoisting and lowering operations are performed. If the hydraulic motor 22 is stopped during winding and lowering, the rotation of the output shaft 22a of the hydraulic motor 22 is braked by the wet multi-plate brake 25, and the rotation of the carrier shaft 27 is still blocked by the band brake 33. Therefore, the winch drum 21 can be held at a predetermined position against the weight of the suspended load.

When the rotation braking of the brake drum 32 by the band brake 33 is released while the rotation of the winch drum 21 is stopped, the carrier shaft 27 is allowed to freely rotate, so that the winch drum 21 is subjected to the weight of the suspended load. It rotates freely and becomes a so-called free fall state. In this free fall state, the winch drum 21
Since the carrier shaft 27 and the brake drum 32 also rotate with the free rotation of the brake drum 32, an air flow in the direction of arrow B in FIG. 1 is generated by the rib 35 of the brake drum 32, and the brake drum 32 is continuously cooled.

To stop the free fall state on the way, the band brake 33 is used to brake the brake drum 3
It is enough to brake the rotation of 2. However, at the time of this braking, the braked portion 3 of the band brake 33 and the brake drum 32 is
Friction heat is generated in the brake drum 32 due to friction with 2a. However, in the winch device 20 of the present embodiment, since the rib 35 itself of the brake drum 32 is formed in a fan shape, an airflow passing through the brake drum 32 is obtained as long as the brake drum 32 is rotating,
The brake drum 32 continues to be cooled until its rotation is completely stopped. Therefore, the brake drum 3 due to frictional heat
2. Excessive heat generation of No. 2 is avoided, whereby damage due to heat generation of the brake drum 32, increase in wear amount of the band brake 33, and decrease in braking force are avoided.

As described above, in this embodiment, the rib 35 of the brake drum 32 is rotated to generate an air flow for cooling, so that the apparatus becomes large and complicated as in the case where an electric fan is provided. There is nothing to do. Further, since the electric fan is not used, there is no possibility of failure, and no special power is required for cooling, which contributes to reduction of fuel consumption of the machine in which the winch device 20 is mounted. Further, since the clutch and the like are eliminated from the inner peripheral side of the brake drum 32 and the rib 35 itself is formed in a fan shape,
As compared to the case where the fan and the heat radiation fins are provided only in the outer peripheral portion of the brake drum as in the conventional example shown in FIG. 8, the fan diameter is significantly increased. As a result, an extremely high cooling effect can be obtained, and the heat dissipation of the brake drum 32 can be sufficiently enhanced without using an electric fan.

It should be noted that the number and shape of the ribs 35 shown in this embodiment are merely examples, and these can be appropriately changed as necessary. In particular, the number of ribs 35 is appropriately adjusted according to the required heat radiation effect.
Further, in this embodiment, the carrier shaft 27 and the brake drum 32 are integrated, but the carrier shaft 27 may be integrated with the winch drum 21, while the ring gear 26 and the brake drum 32 may be integrated. ..

[0016]

As described above, according to the winch device of the present invention, an air flow is generated by utilizing the rotation of the brake drum at the time of lowering such as a free fall state, and the brake drum is cooled by this air flow. Therefore, the device does not become large and complicated unlike the case where the electric fan is provided. Further, since the electric fan is not used, the risk of failure is eliminated, and wasteful energy consumption is eliminated, which contributes to reduction of fuel consumption of a machine equipped with a winch device. Moreover, since the rib itself is formed into a fan shape by removing the clutch and the like from the inner peripheral side of the brake drum, the fan diameter is significantly increased compared to the conventional one, and an extremely high cooling effect is obtained. It is possible to sufficiently enhance the heat dissipation of the brake drum without depending on the above.

[Brief description of drawings]

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

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is an axial sectional view of a conventional winch device.

FIG. 4 is a diagram showing an example of a cooling fan for a brake drum in a conventional winch device.

5 is a diagram showing a state of the cooling fan shown in FIG. 4 viewed from a direction of an arrow V in FIG.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is an enlarged view showing a portion C of FIG.

8 is a diagram showing a state in which the heat radiation fin shown in FIG. 7 is viewed in the direction of arrow VIII in FIG.

[Explanation of symbols]

 20 winch device 22 hydraulic motor 22a hydraulic motor output shaft 23 planetary reducer 25 wet multi-plate brake (first brake) 26 ring gear 27 carrier shaft 32 brake drum 33 band brake (second brake) 35 rib

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location F16D 65/807 8009-3J

Claims (1)

[Claims] 1. A winch device comprising a winch drum, a motor for rotationally driving the winch drum, and a planetary speed reducer for decelerating and transmitting the rotation of an output shaft of the motor to the winch drum. A first brake for braking the rotation of the input shaft of the machine is provided, and one of the ring gear and the carrier shaft of the planetary speed reducer is integrally provided with the winch drum, and the other brake is provided separately from the winch drum. A drum is provided, and a second brake for braking the rotation of the brake drum is provided on the outer peripheral side of the brake drum, and the brake drum is provided from a fitting portion with the ring gear or the carrier shaft provided on the center side of the brake drum. A rib is provided on the braked part provided on the outer periphery of the brake drum. Winch apparatus being characterized in that formed in the resulting make fan-shaped.