JPH0891781A - Winch for construction machinery - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a winch for a construction machine, which is a winch driven by two kinds of hydraulic motors of normal speed and deceleration, and which is convenient to install like a normal winch. [Structure] A wire drum 5, a hydraulic motor 30 for normal speed rotation that rotates at normal speed, and a hydraulic motor 31 for deceleration rotation that rotates at a rotational speed that is decelerated from the wire drum 5 are provided. In the winch for raising and lowering the continuous wall, in which the wire drum 13 can be wound up at different speeds by selectively rotating the wire drum 5 with the sun gear 1
, Ring gear 2, planetary gear 3, sun gear 1
The planetary gear mechanism is configured with the carrier 4 that supports the planetary gear 3 so that it can revolve while rotating on its outer periphery, and the output shaft 34 of the hydraulic motor 30 for constant speed rotation is the sun gear 1.
By connecting the output shaft 35 of the deceleration rotation hydraulic motor 31 to the carrier 4 and attaching the ring gear 2 to the inner peripheral surface 5a of the wire drum 5, both hydraulic motors 3
The wire drum 5 can be selectively driven to rotate at 0 and 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention rotates at a normal rotation speed and a rotation speed slower than this, such as a winch for raising and lowering a continuous wall bucket used when excavating with a continuous wall bucket. The present invention relates to a winch for a construction machine having two types of hydraulic motors to be obtained, and the wire drums can be selectively rotated by these hydraulic motors to wind the wire rope at different speeds.

[0002]

2. Description of the Related Art In large-scale underground excavation work in civil engineering and construction work, there is a danger that a large accident may occur due to collapse of surrounding rocks or intrusion of groundwater into the excavation site during underground excavation. In order to prevent the occurrence of such accidents, prior to underground excavation work, a construction method is being implemented to build an underground continuous wall that fulfills functions such as earth retaining walls and water stop walls around the excavation site. This method is called the underground continuous wall method.
When constructing the underground continuous wall, first, excavate a groove of a predetermined width that reaches the rock so as to surround the periphery of the excavation site,
Next, a reinforced basket is placed in this groove and concrete is poured to construct a reinforced concrete structure as an underground continuous wall. When excavating the trench, not only soft ground but also rock is to be excavated.For this rock excavation, there is a continuous wall bucket that has a rotating cutter like comb teeth at the tip of the bucket and excavates vertically in the ground. A special excavator is used. When performing excavation work from this continuous wall bucket, the excavation work is performed by suspending it from a continuous wall bucket lifting winch installed on a crane via a wire rope and winding it down at a speed commensurate with the excavation speed.

Therefore, an overview of the case of excavating work with a continuous-wall bucket using a crane, the basic structure of the crane, and the technical contents of a conventional winch for raising and lowering the continuous-wall bucket installed on this crane will be described. A description will be given based on FIGS. 2, 3 and 4. FIG. 2 is a side view showing an overall view when excavating work with a continuous wall bucket using a crane, and a side view showing only an underground portion in a cross section. FIG. 3 is a general type winch installed on a swing frame of the crane. FIG. 4 is a plan view schematically showing the state, and FIG. 4 is a mechanism diagram relating to a winch of a conventional construction machine used for raising and lowering a continuous wall bucket.

In FIG. 2, 10 is a traveling body, 11 is a crane body mounted on the traveling body 10 so as to be rotatable, 12 is a hoisting boom provided at the front of the crane body 11, and 13 is a hoisting boom. Is a wire rope for raising and lowering a continuous wall bucket hung around pulleys 14a and 14b provided on the top of the boom 12, and 15 is a rope for raising and lowering the continuous wall bucket for winding and unwinding the wire rope 13. Winch, 16 is a rope for supporting the boom 12, 17 is a hoisting winch for hoisting the boom 12, 19a is a rope that is wound around the pulley 18 and is wound up and down by the hoisting winch 17, 1
A pulley block 9b is pulled by the rope 19a, and pulls the rope 16. The crane main body 11 has a frame such as a chassis called a swing frame, and the swing frame is swingably installed on the traveling body 10 so that it can swing. In this swivel frame, the boom 12 is mounted so as to be able to be hoisted and the cockpit is installed, and the necessary equipment such as the winch 15 for raising and lowering the continuous wall bucket and the hoisting winch 17 is installed behind it. , The crane body 11 is configured.
The hoisting winch 17 pulls up or lowers the rope 19a to pull the rope 16 by an appropriate amount via the pulley block 19b to move the boom 12 up and down. The boom 12 is thus raised and lowered by the up and down winch 17 to stand up at an appropriate angle, and is supported and fixed. In addition, in the drawings, the traveling body 10 is shown as traveling by a crawler, but may be traveling by wheels.

Numeral 20 is a winch 1 for raising and lowering a continuous wall bucket
5 is a continuous wall bucket that is hung via a wire rope 13, and 21 is a rotary excavating claw provided at the tip of the continuous wall bucket 20 like comb teeth, and functions as a rotary cutter. . Reference numeral 22 is an excavation groove formed by digging underground with a continuous wall bucket 20 to construct an underground continuous wall. When attempting to excavate such an excavation groove 22 with the continuous wall bucket 20 using a crane, as shown in FIG. 2, a winch 15 for lifting the continuous wall bucket is attached to the crane and the continuous wall bucket 20 is hung on the winch 15. . Then, the winch 15 is rolled down to apply a downward cutting force to the excavation claw 21 of the continuous wall bucket 20, and the excavation claw 21 is rotated to excavate the excavation groove 22. In the process of excavation, if a hard ground is encountered, the excavation speed will be naturally slower accordingly.
It may be an extremely minute speed of 0 cm. In such a case, if the unwinding speed of the winch 15 becomes faster than the original excavation speed, the bucket descends too quickly, and the excavation claw 21 is heavily weighted, which will be damaged. Therefore, the winch 15 for raising and lowering the continuous wall bucket needs to be lowered at a speed commensurate with the excavation speed of the continuous wall bucket 20.

However, since a winch prime mover of a crane is usually controlled by a hydraulic motor to control the speed of the hydraulic oil by controlling the supply capacity of the hydraulic oil to the hydraulic motor, it is stable in the ultra-low speed range. It is difficult to control the speed. That is, in the hydraulic motor, when the speed control is performed by such a control method, it is inevitable that the pressure oil normally leaks inside due to the load force (the weight of the continuous wall bucket) acting on the hydraulic motor. Under such conditions, if the hydraulic motor is speed-controlled in the ultra-low speed range, the pressure oil supply capacity will be so small as to match the speed in the ultra-low speed range, and the above-mentioned pressure generated internally will be reduced. Since the leakage of oil becomes relatively large with respect to the supply capacity of pressure oil, there is a problem that the leakage of pressure oil causes the motor to rotate freely, making it difficult to perform stable speed control in the ultra-low speed range. Becomes For this reason, ordinary winches commonly used in cranes are generally several meters to 100 meters per minute.
Stable speed control can be performed only in the range of about m, and the speed cannot be controlled to the ultra-fine speed as described above. The winch 15 for raising and lowering the continuous wall bucket is used not only when excavating hard ground by such speed control of ultra-small speed but also when excavating soft ground, and further when pulling up the continuous wall bucket 20. Therefore, not only the lowering speed is required to be slow, but also the ability to drive at the normal speed is required.
Therefore, the winch 15 for raising and lowering the continuous wall bucket is 1
It is necessary to have the ability to wind up and down in a wide speed range from an ultra minute speed of several tens of cm to a normal speed. Conventionally, as a winch capable of reliably exhibiting such performance, a winch having a special structure composed of two types of hydraulic motors as shown in FIG. 4 described later has been proposed. Due to its unique characteristics, it is shaped into a unique shape that differs from the ordinary winches commonly used in cranes.

However, the winch 15 for elevating and lowering the continuous wall bucket, whatever its form, is the crane for installing the winch 15, which is a normal crane used for raising and lowering loads. The winch 15 for raising and lowering continuous wall buckets, like ordinary winches, should desirably fit easily into such cranes. When various winches that are commonly used are installed in this ordinary crane, they are usually installed in the state shown in FIG. That is, covers 23 called buildings are attached to the left and right sides of the swing frame of the crane, and the undulating winch 17 and the lifting hoist 24 for lifting the suspended load are provided with the rope 16 and the wire rope for lifting the suspended load. It is attached to the cover 23 so that it can be extended in the front-back direction. Therefore, like the winches 17 and 24, it is desirable that the winch 15 for raising and lowering the continuous wall bucket is also formed in such a shape that it can be mounted across the cover 23.

Next, a mechanism relating to a winch of a conventional construction machine used for raising and lowering such a continuous wall bucket will be described with reference to FIG. In FIG. 4, 30 is a hydraulic motor for normal speed rotation that can rotate at a normal speed, 31 is a hydraulic motor for normal speed rotation 30 in which the reduction ratio of the built-in speed reducer is made particularly large.
The deceleration rotation hydraulic motors 32, 33 that can rotate at a rotational speed remarkably reduced than the hydraulic motors 30, 3
1 is a small gear having external teeth connected to the output shafts 34 and 35 via clutches 36 and 37 and connecting shafts 38 and 39, 40 is a large gear that meshes with these small gears 32 and 33, and 41 is this large gear A state in which a part of the wire rope 13 for raising and lowering the continuous wall bucket described above is wound on the winch wire drum connected to the central shaft 42 of the 40 is illustrated. Incidentally, 43 and 44 are hydraulic motors 30,
31 is an operation lever for operating each
Is an operation lever for switching the clutches 36 and 37.

Since the winch of the conventional construction machine used for raising and lowering the continuous wall bucket has such a structure, when the winch is rotationally driven at the normal speed, the operating lever 45 is operated to operate the clutch 36. Is operated and the operating lever 43 is operated to rotate the hydraulic motor 30 for normal speed rotation, the rotation is transmitted to the large gear 40 through the clutch 36 and the small gear 32, and the wire drum 41 is rotated at the normal speed. You can Further, when the winch is rotationally driven at an ultra-small speed, when the operation lever 45 is switched to operate the clutch 37 and the operation lever 44 is operated to rotate the deceleration rotation hydraulic motor 31, the rotation is changed to the clutch. The wire drum 41 can be rotated at a super minute speed by being transmitted to the large gear 40 through the 37 and the small gear 33.

[0010]

As described above, the winch of the conventional construction machine used for raising and lowering the continuous wall bucket does not always control the speed over a wide range with a single hydraulic motor, but always uses it. Two types of hydraulic motors having different characteristics, that is, a high-speed rotation hydraulic motor 30 and a deceleration rotation hydraulic motor 31, appropriately share the coverage area for speed control, and selectively rotate and drive the wire drum 41 to control the speed. Since the control is performed, it is possible to surely control the speed over a wide range from the ultra-small speed to the normal speed without difficulty, which is preferable in terms of performance.

However, this conventional winch is
Due to its mechanical characteristics, two types of hydraulic motors, that is, the hydraulic motor 30 for normal speed rotation and the hydraulic motor 31 for deceleration rotation, and a mechanism for transmitting these rotations are concentrated on one side outside of the wire drum 41. Therefore, the winch has a longer axial length and a wider radial width than a normal winch, as shown in FIG. Therefore, this winch, like a normal winch, is shown in FIG.
As shown in the figure, if it is mounted horizontally on the cover 23, it will be difficult to design, and it will not fit as easily as a normal winch, so it will be practically installed on a crane. There was a problem. As mentioned above, we have taken the winches of construction machines for raising and lowering continuous wall buckets as an example and mentioned the problems found in conventional winches, but these problems are not limited to those for raising and lowering continuous wall buckets. If it is a winch of a construction machine in which the wire drum is selectively driven to rotate by the hydraulic motor for deceleration and the hydraulic motor for deceleration rotation, it is a problem that can occur in common.

The present invention solves the problems found in the prior art as described above, and a construction machine capable of selectively rotatably driving a wire drum by a hydraulic motor for normal rotation and a hydraulic motor for deceleration rotation. An object of the present invention is to provide a winch of a construction machine which can be formed into a shape similar to a normal winch of a construction machine while being a winch and which is convenient to install on the construction machine.

[0013]

The object of the present invention is to provide a "wire drum for winding a wire rope,
It has a hydraulic motor for normal speed rotation that can rotate at a normal speed and a hydraulic motor for deceleration rotation that can rotate at a rotational speed that is decelerated from this, and these hydraulic motors selectively rotate and drive the wire drum. In a winch of a construction machine capable of winding a wire rope at different speeds, a sun gear having external teeth and arranged at the center, and an internal tooth having a sun gear are concentrically rotatable with the sun gear. Ring gear, the planetary gear that has outer teeth that mesh with the outer teeth of the sun gear and the inner teeth of the ring gear, and is supported so as to revolve while rotating on the outer periphery of the sun gear, and concentric with the sun gear. The planetary gear mechanism is composed of a carrier that is rotatably mounted on the planetary gear and supports the planetary gear so that it can revolve while rotating on its own axis. A gear mechanism accommodating space is formed, and a hydraulic motor for normal speed rotation and a hydraulic motor for deceleration rotation are arranged to face each other, and one of these hydraulic motors serves as a sun gear and the other hydraulic motor serves as a hydraulic motor. In addition to enabling the carrier to be rotationally driven by, the planetary gear mechanism is arranged in the planetary gear mechanism housing space of the wire drum, and the hydraulic motor for constant speed rotation and the hydraulic motor for deceleration rotation causes
The wire drum can be selectively rotationally driven via the ring gear. "The present invention is achieved by a winch of a construction machine as set forth in the claims.

[0014]

The winch of the construction machine according to the present invention has such a structure. Therefore, when the winch is driven to rotate at the normal speed, when the hydraulic motor for constant speed rotation is rotated,
The sun gear is rotationally driven by the hydraulic motor for constant speed rotation, and the rotation is transmitted to the planetary gear. At this time, since the deceleration rotation hydraulic motor is stationary and the carrier is also stationary, the planetary gear rotates on its axis without revolving and transmits its rotation to the ring gear. Can be rotated at normal speed via.

When the winch is rotationally driven at a rotational speed that is decelerated from the normal speed, when the decelerating rotation hydraulic motor is rotated, the carrier is rotationally driven by the decelerating rotation hydraulic motor, and the rotation thereof is performed. To the planetary gear. At this time, since the hydraulic motor for constant speed rotation is stationary and the sun gear is also in a stationary state, the planetary gear revolves around the sun gear in a stationary state, and its rotation is transmitted to the ring gear. The wire drum can be rotated through the ring gear at a rotational speed that is slower than the normal speed. Therefore, according to the winch of the construction machine of the present invention, the speed of the winch can be varied over a wide range by selectively rotating the wire drum by the hydraulic motor for normal rotation and the hydraulic motor for deceleration rotation. It can be controlled reliably in the area.

[0016]

1 shows a winch of a construction machine according to an embodiment of the present invention.
It will be described based on. FIG. 1 is a mechanism diagram of a winch of a construction machine according to an embodiment of the present invention. In FIG. 1, the parts denoted by the same reference numerals as those in FIG. 4 represent the same parts as those in FIG.

A winch for a construction machine shown as an example of the present invention is a winch for a construction machine for raising and lowering a continuous wall bucket, as in the conventional example, and a wire for winding a wire rope 13 for raising and lowering the continuous wall bucket. It has a drum, a hydraulic motor 30 for normal speed rotation that can rotate at a normal speed, and a hydraulic motor 31 for deceleration rotation that can rotate at a rotational speed that is decelerated from the drum. A wire drum for raising and lowering a wall bucket is selectively driven to rotate so that the wire rope 13 can be wound at different speeds.

Reference numeral 1 denotes a sun gear which has external teeth and is arranged at a central portion, 2 denotes a ring gear which has internal teeth and is rotatably provided concentrically with the sun gear 1, and 3 denotes an outside of these sun gears 1. The planetary gears 4 having teeth and outer teeth meshing with the inner teeth of the ring gear 2 and supported so as to be able to revolve around the outer periphery of the sun gear 1 are rotatably provided concentrically with the sun gear 1. The planetary gear 3 is a carrier that supports the planetary gear 3 so that it can revolve while rotating on its own axis. The sun gear 1, the ring gear 2, the planetary gear 3, and the carrier 4 constitute a so-called planetary gear mechanism. The sun gear 1 of this planetary gear mechanism is connected to the output shaft 34 of the hydraulic motor 30 for constant speed rotation, and the carrier 4 is connected to the output shaft 35 of the hydraulic motor 31 for deceleration rotation. 31 are arranged so as to face each other. On the other hand, the planetary gear mechanism storage space 6 is formed inside the wire drum 5, and the ring gear 2 is attached to the inner peripheral surface 5a of the wire drum 5 to dispose the planetary gear mechanism in the planetary gear mechanism storage space 6. I am trying to do it. In this embodiment, in addition to disposing the planetary gear mechanism in the planetary gear mechanism housing space 6 of the wire drum 5 as described above, the normal rotation hydraulic motor 30 and the deceleration rotation hydraulic motor 31 are also housed in the planetary gear mechanism housing. It is arranged so as to enter the space 6.

Since the winch of the construction machine of the present embodiment has such a structure, when it is desired to drive the winch to rotate at a normal speed, the operating lever 43 is operated to operate the hydraulic motor 30 for constant speed rotation. When rotated, the sun gear 1 is rotationally driven by the output shaft 34 of the hydraulic motor 30 for constant speed rotation, and the rotation is transmitted to the planetary gear 3. This time,
The operation lever 44 is not operated, the deceleration rotation hydraulic motor 31 is stationary, and the carrier 4 is also stationary. Therefore, the planetary gear 3 does not revolve, and the rotation direction of the constant speed rotation hydraulic motor 30 is not changed. It rotates in the opposite direction and then transmits the rotation of the planetary gear 3 to the ring gear 2 to rotate the ring gear 2 in the same direction as the rotation.
As a result, the winch wire drum 5 is attached to the ring gear 2
It is possible to rotate at a normal speed in the direction opposite to the rotating direction of the hydraulic motor 30 for constant speed rotation via.

Further, when the winch is rotationally driven at an extremely small speed, the operating lever 44 is operated to rotate the hydraulic motor 31 for deceleration rotation, and the carrier 4 causes the output shaft of the hydraulic motor 31 for deceleration rotation. It is rotationally driven by 35 and transmits the rotation to the planetary gear 3. At this time, the operation lever 43 is not operated, and the hydraulic motor 30 for constant speed rotation is operated.
Is stationary and the sun gear 1 is also stationary. Therefore, the planetary gear 3 revolves around the sun gear 1 in a stationary state, and rotates in the same direction as the rotation direction of the deceleration rotation hydraulic motor 31, and then, The rotation of the planetary gear 3 is transmitted to the ring gear 2, and the ring gear 2 is rotated in the same direction as the rotation of the planetary gear 3. As a result, the winch wire drum 5 can be rotated at the ultra-small speed in the same direction as the rotation direction of the deceleration rotation hydraulic motor 31 via the ring gear 2. In the present embodiment, when the wire drum 5 is rotationally driven by the normal speed rotation hydraulic motor 30 and the deceleration rotation hydraulic motor 31, respectively, the wire drum 5 is rotated even if these hydraulic motors 30 and 31 are rotated in the same direction. Although the problem of rotating in the opposite direction occurs, such a problem is caused by rotating the hydraulic motors 30, 31 in opposite directions when operating the operating levers 43, 45 for operating the hydraulic motors 30, 31 in the same direction. If it is designed so that it can be solved easily.

Therefore, according to the present embodiment, the two types of hydraulic motors, that is, the normal-speed rotation hydraulic motor 30 and the deceleration rotation hydraulic motor 31, appropriately divide the roles and selectively rotate the wire drum 5. Since it is possible to control the speed of the winch, as in the prior art, it is possible to control the speed over a wide range from the ultra-small speed to the normal speed without difficulty, and the winch of the construction machine that is preferable in terms of performance can be obtained. can get. When constructing a winch for such a construction machine, the planetary gear mechanism is arranged in the planetary gear mechanism housing space 6 of the wire drum 5. Therefore, the winch of this embodiment has a conventional axial distance. It does not have to be long like a winch, and can be easily attached to the cover 23 of the crane in a horizontal state without difficulty. Further, the sun gear 1 of the planetary gear mechanism is connected to the output shaft 34 of the hydraulic motor 30 for constant speed rotation, and the carrier 4 is connected to the output shaft 35 of the hydraulic motor 31 for deceleration rotation, so that both hydraulic motors 3 are connected.
Since 0 and 31 are arranged so as to face each other, the winch of the present embodiment does not have a wide radial width like the winch of the conventional example, and can be installed well when installed in a crane. . Therefore, the winch of the construction machine of the present embodiment is capable of selectively rotating the wire drum 5 by the hydraulic motor 30 for constant speed rotation and the hydraulic motor 31 for deceleration rotation, which is preferable in terms of performance. Unlike the conventional winch, the winch can be formed into a shape similar to a normal winch of a construction machine, which is convenient for installation on the construction machine.

In this embodiment, in addition to disposing the planetary gear mechanism in the planetary gear mechanism housing space 6 of the wire drum 5, in particular, the hydraulic motor 30 for constant speed rotation and the hydraulic motor 31 for deceleration rotation are also provided. Since it is arranged so as to enter the planetary gear mechanism housing space 6, the axial distance of the winch can be further shortened as compared with the conventional example.
Better installation on construction machinery. In addition to these excellent effects, the winch of this embodiment selectively rotates the two types of hydraulic motors 30 and 31 to the wire drum 5 by the planetary gear mechanism without using the clutches 36 and 37 unlike the winch of the conventional example. Therefore, it is not necessary to operate the clutch like the conventional winch when driving the winch, and the winch driving operation can be easily performed.

In the embodiments described above, the winch for raising and lowering the continuous wall bucket has been described, but such an effect is obtained by the construction machine in which the wire drum is selectively driven to rotate by the hydraulic motor for constant speed rotation and the hydraulic motor for deceleration rotation. The present invention can be applied not only to winches for raising and lowering a continuous wall bucket, but also to winches of other construction machines using such two types of hydraulic motors, since the winches are naturally required effects. Further, in the present embodiment, when the planetary gear mechanism is arranged in the planetary gear mechanism housing space 6, the ring gear 2 is arranged by being attached to the inner peripheral surface 5a of the wire drum 5. The wire drum 5 may be integrally formed and arranged on the inner peripheral surface 5a. In the present embodiment, the sun gear 1 of the planetary gear mechanism is connected to the output shaft 34 of the hydraulic motor 30 for constant speed rotation, and the carrier 4 is connected to the output shaft 35 of the hydraulic motor 31 for deceleration rotation. Conversely, the output shafts 34 and 35 of the hydraulic motors 30 and 31 can be connected to the carrier 4 and the sun gear 1, respectively, in the opposite manner.
Constant speed rotation hydraulic motor 30 and deceleration rotation hydraulic motor 31
And the hydraulic motor 3 are arranged so as to face each other.
It suffices that one of the hydraulic motors 0 and 31 can rotate the sun gear 1 and the other hydraulic motor can rotate the carrier 4.

[0024]

As is apparent from the above description, the present invention provides a wire drum for winding a wire rope, a hydraulic motor for constant speed rotation capable of rotating at a normal speed, and a rotation speed decelerated lower than this. With a deceleration rotation hydraulic motor that can rotate at a speed, and a winch of a construction machine that can wind a wire rope at different speeds by selectively rotating a wire drum with these hydraulic motors, in particular,
"A sun gear, a ring gear, and a planetary gear that is supported so as to revolve while rotating around the outer periphery of the sun gear by meshing with the sun gear and the ring gear,
The planetary gear mechanism is composed of the carrier that supports the planetary gear so that it can revolve while revolving on its own axis, and the planetary gear mechanism housing space is formed inside the wire drum, and the hydraulic motor for normal speed rotation and deceleration rotation are formed. Of the hydraulic motors are arranged so as to face each other so that one of these hydraulic motors can rotate the sun gear and the other hydraulic motor can rotate the carrier. It is arranged in the planetary gear mechanism storage space of the drum so that the wire drum can be selectively rotated by the hydraulic motor for constant speed rotation and the hydraulic motor for deceleration rotation via the ring gear. The wire drum can be selectively rotationally driven by the hydraulic motor for speed reduction and the hydraulic motor for deceleration rotation, which is preferable in terms of performance.
It is possible to obtain a winch for a construction machine, which has a feature that it can be formed into a shape similar to an ordinary winch of a construction machine and is more convenient to install on a construction machine than a conventional winch. As described above, the present invention exhibits excellent utility as an on-site technique in terms of both performance and convenience of installation, and is extremely practical.

In addition to the above basic effects, the present invention has the effect that when the winch is driven, it can be driven without operating the clutch, and the operation when driving the winch can be performed more easily than in the conventional example. Can also be played together. Further, when the present invention is practically embodied, in particular, by adopting the configuration as described in claim 2 of the claims, the hydraulic motor for constant speed rotation and the hydraulic motor for deceleration rotation are connected to the wire drum. If it is arranged so as to enter the planetary gear mechanism housing space, the axial distance of the winch can be further shortened as compared with the conventional example, and the convenience of installation on the construction machine becomes better.

[Brief description of drawings]

FIG. 1 is a mechanism diagram relating to a winch of a construction machine of the present invention.

FIG. 2 is a side view showing an overall image when excavating work with a continuous wall bucket using a crane, showing only an underground portion in a cross section.

FIG. 3 is a plan view schematically showing a state in which a winch of a normal type is installed on a swing frame of a crane.

FIG. 4 is a mechanism diagram relating to a winch of a conventional construction machine used for raising and lowering a continuous wall bucket.

[Explanation of symbols]

 1 Sun Gear 2 Ring Gear 3 Planetary Gear 4 Carrier 5 Wire Drum 6 Planetary Gear Mechanism Storage Space 11 Crane Main Body 12 Boom 13 Wire Rope for Elevating Continuous Wall Bucket 15 Winch for Elevating Continuous Wall Bucket 20 Continuous Wall Bucket 21 Excavation Claw 22 Excavation Groove 30 Hydraulic motor for constant speed rotation 31 Hydraulic motor for deceleration rotation 34 Output shaft of hydraulic motor for constant speed rotation 35 Output shaft of hydraulic motor for deceleration rotation 43 Operation lever of hydraulic motor for constant speed rotation 44 Operating lever

Claims (2)

[Claims] 1. A wire drum for winding a wire rope, a hydraulic motor for normal speed rotation that can rotate at a normal speed, and a hydraulic motor for deceleration rotation that can rotate at a rotational speed that is decelerated than this. In a winch of a construction machine capable of selectively rotating a wire drum with these hydraulic motors to wind a wire rope at different speeds, a sun gear having external teeth and arranged in a central portion, The ring gear has inner teeth and is rotatably provided concentrically with the sun gear, and has outer teeth that mesh with the outer teeth of the sun gear and the inner teeth of the ring gear. A planetary gear that is rotatably supported, and a carrier that is rotatably provided concentrically with the sun gear and that rotatably supports the planetary gear in this manner. In addition to configuring the planetary gear mechanism with, the planetary gear mechanism storage space is formed inside the wire drum, and the hydraulic motor for normal speed rotation and the hydraulic motor for deceleration rotation are arranged to face each other. One of the hydraulic motors can rotate the sun gear, and the other hydraulic motor can rotate the carrier, and the planetary gear mechanism is placed in the planetary gear mechanism storage space of the wire drum. A winch for a construction machine, wherein a wire drum can be selectively rotationally driven via a ring gear by a motor and a deceleration rotation hydraulic motor. 2. The winch for a construction machine according to claim 1, wherein the hydraulic motor for constant speed rotation and the hydraulic motor for deceleration rotation are arranged so as to enter the planetary gear mechanism storage space of the wire drum.