JPH10167677A - Winch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the length of a winch device in axial direction, set at a specified restricted position of a load handling machine, eliminate the risk of falling of a lifted load even if a clutch hydraulic circuit fails, and enable free-fall operation at a light load of approx. the self-weight of a hook. SOLUTION: A winch device is formed with a rope winding drum 3, a support bracket 7a on one side of the drum 3, a hydraulic motor 1 installed on the support bracket 7a, a support shaft 7b which is located inside the drum 3 and supports it, a planetary gear speed reducer 4 incorporated in the drum 3, and an input shaft 4a which transmits a torque from the hydraulic motor 1 to the planetary gear speed reducer 4. In this case, a dry multiple disk negative clutch 5 is incorporated in the drum 3, a brake device 6 is installed on one side of the drum 3, and the carrier 4g of a final speed reduction stage in the planetary gear speed reducer 4 is connected to the negative clutch 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winch device, and more particularly to a winch device used for a cargo handling machine such as a crane.

[0002]

2. Description of the Related Art In general, a winch device used in a cargo handling machine includes a drum having a rope wound around a cylindrical winding drum,
It has a drive motor such as a hydraulic motor, a speed reducer and a clutch, and is configured to transmit the output torque of the drive motor to the drum via the speed reducer and the clutch.

[0003] A planetary gear reduction mechanism is used as a speed reducer, and the planetary gear reduction mechanism is built in the drum, and has a clutch for transmitting torque of a driving motor to the drum and a brake for braking the rotation of the drum. As a winch device, for example, a winch disclosed in JP-A-58-162497 and a winch driving device for a crane vehicle disclosed in JP-A-4-213594 are known. As a winch device incorporating a planetary gear reduction mechanism and a multi-plate clutch in a drum, for example,
A winch disclosed in Japanese Patent Publication No. 0-180295 and a winch disclosed in Japanese Utility Model Publication No. 1-38145 are known.

[0004]

However, the winch disclosed in Japanese Patent Application Laid-Open No. 58-162497 is disclosed.
In the winch drive device for a crane truck disclosed in Japanese Patent Application Laid-Open No. Hei 4-213594, the clutch structure is an internal expansion drum type (dry type). It is difficult to incorporate a clutch by using a clutch. Therefore, the clutch must be arranged outside the drum flange, and there is a restriction in reducing the overall length of the winch. In addition, since the operation of the clutch is configured so that the clutch is engaged when pressure oil is supplied, there is a risk that the engagement of the clutch may be disconnected if the hydraulic pipe for clutch connection / disconnection is damaged.

In the winch disclosed in Japanese Utility Model Laid-Open Publication No. 60-180295, a multiple disc clutch is built in the drum, but the clutch disc is disengaged because the clutch disc is a wet clutch in oil. Drag resistance is large even in a state where it is left. Therefore, it is difficult to free-fall a light load, and in this case, it is necessary to greatly increase the weight of a hook or the like. Further, since a brake dedicated to free fall is not provided, it is difficult to control the speed and stop position of the hook by the brake during free fall.

In the winch disclosed in Japanese Utility Model Publication No. 1-38145, a driving motor and a speed reducer, and a clutch and a brake device are arranged on the left and right sides of the drum, respectively. The structure extends greatly on both the left and right sides, and the overall length of the winch is long. Also, it is necessary to install hydraulic piping on both the left and right sides of the drum. Therefore, for example, it is difficult to arrange the two main winches side by side on the right and left sides of the crane boom in terms of space. Further, the pressurized oil to be filled into the oil chamber when the clutch is disengaged is supplied through an oil hole provided on the drum shaft, so that a rotary joint is required, which is disadvantageous in terms of cost and reliability. .

The present invention has been made in view of the above-mentioned conventional problems, and relates to a winch device. In particular, the entire length (axial length) of the winch device is short, and the winch device is compactly installed at a predetermined position on a cargo-handling machine. It is an object of the present invention to provide a winch device capable of performing a free-fall operation even with a light load of the hook's own weight and having no danger of dropping a suspended load even if a clutch hydraulic circuit is damaged.

[0008]

In order to achieve the above object, a winch device according to the present invention comprises a drum for winding a rope, a support bracket provided on one side of the drum, and a support bracket attached to the support bracket. A drive motor, a support shaft inside the drum for supporting the drum, a planetary gear reducer built into the drum, and an input shaft for transmitting the output torque of the drive motor to the planetary gear reducer. In the winch device, a dry multi-plate negative clutch for intermittently switching power transmission from the planetary gear reducer to the drum is incorporated in the drum. According to the above configuration, (1) Since the reduction gear and the dry multi-plate clutch are built in the drum, the empty space in the drum can be effectively used, and the overall length of the winch can be shortened. In addition, the multi-plate clutch can transmit a required clutch torque with a smaller diameter than that of the inner drum type clutch. (2) Since the clutch is of a dry type, when the clutch is disengaged, no drag occurs due to the viscosity of the oil unlike the wet clutch. Therefore, a free fall is possible even under a light load, and the weight of the hook can be reduced. (3) Since the clutch is operated in a negative manner in which the disc is pressed by a spring and engaged, the clutch remains engaged even when the hydraulic pressure is reduced due to damage to the clutch hydraulic circuit or the like. Therefore, unlike the positive clutch, the accident that the drum suddenly idles and the suspended load falls does not occur. Further, unlike the positive clutch, it is not necessary to apply a predetermined oil pressure to the clutch circuit at all times during winch work, so that the hydraulic circuit configuration is simplified and energy loss is small.

Further, the winch device according to the present invention is characterized in that a dry multi-plate negative clutch portion and a seal portion for blocking the flow of outside air are provided.
According to the above configuration, since the seal portion for blocking the flow of the outside air from the clutch portion is provided, it is possible to prevent rainwater or the like from entering the clutch portion or the outside air containing moisture from entering the clutch portion, and to dry the environment of the clutch portion. Can be kept in condition. As a result, it is possible to prevent the clutch from failing to be released due to rusting of the clutch portion, that is, to prevent free fall from occurring due to an increase in drag resistance.

In the winch device according to the present invention, a driving motor and a brake device for braking the rotation of the drum are provided on one side of the drum. According to the above configuration, (1) Since the brake device is provided separately from the dry multi-plate clutch built in the drum, the rotation control of the drum during the free fall can be performed smoothly and accurately. (2) A clutch capable of switching ON / OFF of power transmission to the drum and a brake separately provided to brake the rotation of the drum when power transmission is OFF (drum free rotation). Thereby, free fall work becomes easy, and delicate speed control and accurate stop during free fall work can be performed. (3) Since the brake device is provided on one side of the same drum as the hydraulic motor, there is no projecting portion on the other side of the drum, and the overall length of the winch device does not increase more than necessary. Further, the hydraulic motor, the dry multi-plate clutch, the hydraulic piping to the brake device, and the like can be integrated on one side of the drum. In addition, when the main winch device and the auxiliary winch device are arranged opposite to the left and right sides of the boom by providing a compact winch device without providing a protrusion on the other side of the drum, the two winch devices are connected to the boom. It is easy to install in close proximity, and the turning radius of the rear part of the boom can be reduced.

Further, the winch device according to the present invention is characterized in that the carrier of the final reduction stage in the planetary gear reducer is connected to a dry multi-plate negative clutch.
According to the above configuration, by adopting the negative clutch,
As long as no hydraulic pressure acts on the clutch piston, the clutch is always engaged. Therefore, if the carrier at the final reduction stage in the planetary gear reducer is connected to the clutch, the rotation of the carrier is restricted, and the torque of the drive motor is transmitted to the ring gear. Then, the drum rotates together with the ring gear with a predetermined reduction ratio. When the clutch is released, the carrier rotates freely,
No driving torque is transmitted to the drum, and free fall is possible.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the winch device according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of the winch device. The winch device includes a hydraulic motor 1 as a driving source, a drum 3 for winding a rope 2, a planetary gear reducer 4 built in the drum 3, a dry multi-plate negative clutch 5, and a brake device 6. ing. The hydraulic motor 1 is attached to a support bracket 7a.
a is attached to a bracket 8 holding the winch device. The support bracket 7a is provided with a support shaft 7b projecting from one side of the drum 3 (the left side of the drum 3 in FIG. 1).

The planetary gear reducer 4 comprises a two-stage planetary gear reduction mechanism. One end of the first-stage planetary gear reduction mechanism is spline-coupled to the output shaft of the hydraulic motor 1 and a first sun gear is formed at the other end. An input shaft 4a, one or more first pinion gears 4b disposed around the first sun gear and meshing with the first sun gear, a first carrier 4c rotatably holding the first pinion gear 4b, and a first carrier 4c. It is composed of a pinion gear 4b and a ring gear 4d that meshes.

The second stage planetary gear reduction mechanism includes a second sun gear 4e, which meshes with an internal gear provided on the first carrier 4c and transmits only the revolution of the first pinion gear 4b, and a periphery of the second sun gear 4e. One or more second pinion gears 4f that are arranged and mesh with the second sun gear 4e and the ring gear 4d, a second carrier 4g that rotatably holds the second pinion gear 4f, and a tooth portion of the ring gear 4d, and , A drum gear 4 h attached to the drum 3.

The dry multi-plate negative clutch 5 includes a clutch drum 5a attached to a bracket 7a, a plate 5b, a hub 5c, a disk 5d, a piston 5e, a spring 5f, and a clutch gear 5g. The clutch 5 is separated from the planetary gear reducer 4 by an oil seal, and is of a dry type. Further, since the dry multi-plate negative clutch 5 is separated from the outside by the seal 5i and the O-ring 5j, the inflow and outflow of outside air is blocked, and the outside air containing moisture does not flow. Further, the dry multi-plate negative clutch 5 is always kept in a dry environment without intrusion of rainwater or the like.

An inner gear is formed on the inner surface of the clutch drum 5a, and the inner gear is engaged with a plate 5b having an outer gear. On the other hand, an external gear is formed on the hub 5c, and the external gear meshes with a disk 5d having an internal gear. The plates 5b and the disks 5d are alternately arranged, and are urged by a spring 5f via a piston 5e slidable along the outer peripheral surface of the support shaft 7b and pressed against the bottom surface of the clutch drum 5a. A clutch gear 5g is attached to the end face of the hub 5c on the planetary gear reducer side. An internal gear provided on the clutch gear 5g is fitted to an external gear provided on an outer periphery of a flange portion of the second carrier 4g. I agree. Therefore, the hub 5c rotates integrally with the second carrier 4g via the clutch gear 5g. Further, the piston 5e and the support shaft 7b
The ring-shaped space surrounded by the above forms a hydraulic chamber 5h. A support bracket 7 is provided in the hydraulic chamber 5h.
Pressure oil is supplied from outside through the oil holes provided in the support shaft 7a and the support shaft 7b.

The hub 5c has a bearing 9 mounted on the inner periphery.
a to the tip of the support shaft 7b, and a retainer 9c on the outer periphery via a bearing 9b.
Is attached. The retainer 9c is fixed to the drum 3. The other end (right side in FIG. 1) of the drum 3 is supported by a bracket 8 via a bearing 9d.

Next, the operation of the planetary gear reducer 4 will be described. When the hydraulic motor 1 rotates the input shaft 4a, the first pinion gear 4b meshes with the ring gear 4d to rotate and revolve around the input shaft (first sun gear) 4a. As a result, only the revolution of the first pinion gear 4b is transmitted to the first carrier 4c, and the first-stage deceleration is performed.
When the second sun gear 4e is rotated by the first carrier 4c, the second pinion gear 4f meshes with the second sun gear 4e and the ring gear 4d to rotate. However, since the second carrier 4g is fixed to the clutch via the clutch gear 5g, the ring gear 4d revolves around the second pinion gear 4f as the second pinion gear 4f rotates. As a result, the second-stage deceleration is performed, and the drum 3 rotates via the drum gear 4h fitted to the ring gear 4d.

The operation of the dry multi-plate negative clutch 5 is as follows. (1) During normal operation, that is, during hoisting and lowering by power, pressure oil is not supplied to the hydraulic chamber 5h, and the spring 5
The plate 5b and the disk 5d are pressed by the tension of f, and the dry multi-plate negative clutch 5 is engaged (clutch ON). As a result, the rotation of the second carrier 4g is restricted, and the output torque of the hydraulic motor 1 is reduced to the ring gear 4d.
Is transmitted to The drum 3 is reduced at a predetermined reduction ratio with respect to the rotation speed of the hydraulic motor 1, and rotates integrally with the ring gear 4d. (2) When stopping the rotation of the drum 3 and holding it at that position, the clutch is ON as in (1) above, but a brake described later is operated. (3) During free fall, the clutch is turned off.
Pressure oil is supplied to the hydraulic chamber 5h, and the piston 5e slides by a predetermined stroke in a direction to compress the spring 5f. This stroke is a stroke set to give an appropriate gap to the friction surface between the disk 5d and the plate 5b, and the piston 5e slides by this stroke, whereby the piston 5e and the disk 5d, and the disk 5d and the plate 5b, a gap is formed between the disk 5d and the clutch drum 5a, and friction is eliminated. Then, the hub 5c is freely rotatable with respect to the clutch drum 5a. Accordingly, the rotation of the second carrier 4g is free, the power is not transmitted to the ring gear 4d, and the drum 3 is free to rotate. (4) When stopping the rotation of the drum 3 at the time of the free fall, the clutch is OFF as in the above (3), but the brake described later is operated.

The brake device 6 is composed of a brake disc 6a attached to a flange on one side of the drum 3, that is, a flange on the same side as the hydraulic motor 1, and a brake caliber 6b attached to a bracket 8. I have.
The brake caliber 6b includes brake pads 6c, 6c provided so as to sandwich both surfaces of the brake disc 6a.
It has a negative brake mechanism and a positive brake mechanism. The negative brake mechanism includes a negative brake piston 6d and a disc spring 6e that presses the negative brake piston 6d rightward in FIG.
The positive brake mechanism has a positive brake piston 6f.

The brake device 6 is used for holding a suspended load at a certain height and for braking and stopping during free fall. When holding the suspended load, the negative brake mechanism is operated in a state where the dry multi-plate negative clutch 5 is engaged. In this case, the hydraulic pressure acting on the negative brake piston 6d from the brake disk 6a side, that is, the pressure oil pressing the disc spring 6e is discharged. Thereby, both surfaces of the brake disk 6a are pressed by the brake pads 6c, 6c, and the rotation of the drum 3 is stopped. Since the negative brake mechanism is used, there is no danger that the suspended load will fall even if the hydraulic pressure drops due to damage to the brake hydraulic circuit or the like.

A positive brake mechanism is used for braking and stopping during free fall. In this case, the hydraulic pressure acts on the positive brake piston 6f, so that the brake pads 6c press the brake disc 6a. The negative brake mechanism and the positive brake mechanism can operate independently. In this embodiment, the caliper disk type brake is used. However, the present invention is not limited to this, and a dry band type brake may be used.

Table 1 summarizes the operation of the clutch and brake during the winch operation.

[0024]

[Table 1]

FIG. 2 is a partial explanatory view showing a state in which the winch device of this embodiment is disposed at the rear end of a boom of a truck crane or the like. Main winch device 11, auxiliary winch device 1
Numeral 2 is symmetrical, and is attached to both sides of the base of the boom 13 so as to face each other. Both the main winch device 11 and the auxiliary winch device 12 have substantially flat end faces close to the boom 13 and no protruding portions, so that the gap A between the side surface of the boom 13 is small. In addition, since the winch device is compact, its overall length (axial length) is short, and the boom 1
The distance B from the center line 3 to the outer ends of the main winch device 11 and the auxiliary winch device 12 is reduced. Furthermore,
Since the distance C from the turning center O of the boom 13 to the rear end of the winch device is also short, the turning radius R of the main winch device 11 and the auxiliary winch device 12 when the boom 13 is turned is small. Therefore, work can be easily performed even in a relatively narrow place.

[Brief description of the drawings]

FIG. 1 is a sectional view of a winch device showing an embodiment of the present invention.

FIG. 2 is a partial explanatory view showing a state in which two winch devices are provided at a rear end of a boom of a truck crane or the like.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic motor 2 Rope 3 Drum 4 Planetary gear reducer 4a Input shaft 4g 2nd carrier 5 Dry multi-plate negative clutch 5a Clutch drum 5g Clutch gear 6 Brake device 6a Brake disc 6b Brake caliper 7a Support bracket 7b Support shaft

Claims (4)

[Claims] 1. A drum for winding a rope, a support bracket provided on one side of the drum, a driving motor attached to the support bracket, a support shaft inside the drum for supporting the drum, and a drum. In a winch device equipped with a planetary gear reducer built in the motor and an input shaft for transmitting the output torque of the drive motor to the planetary gear reducer, a dry type gear that performs intermittent switching of power transmission from the planetary gear reducer to the drum is provided. A winch device comprising a plate-type negative clutch incorporated in the drum. 2. The winch device according to claim 1, further comprising a dry multi-plate negative clutch portion and a seal portion for shutting off a flow of outside air. 3. The winch device according to claim 1, wherein a drive motor and a brake device for braking the rotation of the drum are provided on one side of the drum. 4. The winch according to claim 1, wherein the carrier at the final reduction stage in the planetary gear reducer is connected to a dry-type multi-plate negative clutch. apparatus.