JPH11139782A - Crane device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote the compactification of a crane device, and also to install a braking function in a motor-driven winch of this crane device in a simple manner. SOLUTION: In this crane device, a two-stage speed reducing mechanism consisting of a planetary gear reducer 51 and a worm gear reducer 61 is installed in space between an output shaft 37A in a motor 37 of a motor-driven winch 30 and a turning shaft 31A of a wire drum, and the output shaft 37A is orthogonally set up in the turning shaft 31A of the wire drum 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane device suitable for use as a vehicle-mounted crane device mounted on an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, as an on-vehicle type crane device, an electric winch is fixed to a boom provided to be pivotable with respect to a gantry as described in Japanese Patent Application Laid-Open No. 50-125454, and a wire drum of the electric winch is rotated. The shaft is arranged orthogonal to the longitudinal direction of the boom, and the wire unwound from the wire drum is wound around a pulley provided at the end of the boom and can be drawn out.

As the electric winch used in the above-described crane device, as described in Japanese Utility Model Publication No. 221513, a spur gear is provided between the output shaft of the motor of the electric winch and the rotating shaft of the wire drum. And an electromagnetic brake device on the output shaft of the motor.

[0004]

However, the prior art has the following problems. Under the condition that the rotation axis of the wire drum of the electric winch is arranged orthogonally to the longitudinal direction of the boom, the output shaft of the motor is arranged coaxially or parallel to the rotation axis of this wire drum. The direction is orthogonal to the longitudinal direction of the boom. For this reason, the end of the motor in the axial direction of the motor protrudes greatly in the direction perpendicular to the longitudinal direction of the boom, and for example, the space occupied by the vehicle-mounted crane device in the vehicle is unnecessarily large (reduction of the effective cargo handling space of the vehicle). Becomes

An electric winch is provided with an electromagnetic brake device, and is mechanically and electrically complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the size of a crane device and to easily provide an electric winch of the crane device with a brake function.

[0007]

According to the first aspect of the present invention, an electric winch is fixed to a boom provided to be pivotable with respect to a gantry, and a rotating shaft of a wire drum of the electric winch is arranged in a longitudinal direction of the boom. In a crane device which is arranged orthogonally and can be wound out by pulling a wire unwound from the wire drum around a pulley provided at the end of the boom, a crane device is provided between the output shaft of the motor of the electric winch and the rotation shaft of the wire drum. , A two-stage reduction mechanism of a planetary gear reducer and a worm gear reducer, the planetary gear reducer connects its sun gear to the output shaft of the motor, and arranges its planetary gear in the direction along the output shaft of the motor. The worm is connected to the carrier for the planetary gear of the planetary gear reducer, and the worm wheel to which the rotating shaft of the wire drum is connected By orthogonally arranged in the direction along the output shaft of the motor is obtained by the so orthogonally arranged output shaft of the motor with respect to the axis of rotation of the wire drum.

According to a second aspect of the present invention, in the first aspect of the present invention, the electric winch accommodates a worm gear reducer in a worm gear box and also accommodates a planetary gear reducer. It was made.

[0009]

According to the first aspect of the present invention, the following effects are obtained. A worm gear reducer is provided by providing a two-stage reduction mechanism of a planetary gear reducer and a worm gear reducer between a motor and a wire drum under a state in which a rotating shaft of a wire drum of an electric winch is arranged orthogonally to a longitudinal direction of a boom. The rotation axis of the worm and the worm wheel are converted by 90 degrees from each other, and the output shaft of the motor is arranged orthogonal to the rotation axis of the wire drum. As a result, the output shaft direction of the motor is aligned with the longitudinal direction of the boom. It will be along. For this reason, the motor does not protrude greatly in the direction orthogonal to the longitudinal direction of the boom, and for example, the space occupied by the vehicle-mounted crane device in the vehicle is reduced (the effective cargo handling space of the vehicle is increased).

Since the worm gear reducer is provided between the motor and the wire drum, a brake function based on the self-lock of the worm gear can be provided without providing a special brake device.

Since the two-stage reduction mechanism of the planetary gear reducer and the worm gear reducer is provided between the motor and the wire drum, a constant reduction ratio is obtained by the planetary gear reducer, and the share of the reduction ratio by the worm gear reducer is provided. Can be reduced, and as a result, the efficiency of the worm gear can be improved.

According to the second aspect of the present invention, the following operations are provided. Since the electric winch accommodates not only the worm gear reducer but also the planetary gear reducer in the worm gear box, the electric winch can be made compact and the crane device can be made compact.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view showing a vehicle-mounted crane device, FIG. 2 is a side view of FIG. 1, FIG. 3 is a schematic diagram showing a lifting device, FIG. 4 is a front view showing an electric winch, and FIG. 4 is a side view of FIG. 4, FIG. 6 is a sectional view taken along line VI-VI of FIG. 5, FIG. 7 is a sectional view taken along line VII-VII of FIG. 4, and FIG. FIG. 9 is an electric circuit diagram of the crane device.

As shown in FIGS. 1 and 2, the on-vehicle type crane apparatus 10 is disposed in front of a carrier 12 of a light truck 11 and is used for light weight cargo handling of, for example, about 200 kg.

In the crane apparatus 10, a column base 14 is fixed to a gantry 13 attached to a loading platform 12, and a column 15 is rotatably supported by the column base 14. A boom 17 is supported on the column 15 via a support shaft 16 so as to be tiltable. The boom 17 is the first boom 17A
And the second boom 17B are extendably connected to each other, and the lifting device 1 is provided between the column 15 and the first boom 17A.
8, an electric winch 30 is fixed to the first boom 17A, and a pulley 19 is provided at the tip of the second boom 17B.

That is, in the crane device 10, the first
After the telescopic position of the second boom 17B with respect to the boom 17A is manually set, the second boom 17B is locked with a lock pin (not shown), and the column 15 is manually turned to set the boom 17 to a predetermined turning position. The boom 17 is tilted, and the wire 32 unwound from the wire drum 31 of the electric winch 30 is wound around the pulley 19 and drawn out.
The load locked on the hook 33 of the wire 32 can be raised.

As shown in FIG. 3, the lifting device 18 has a hydraulic cylinder 21, a pump 22, and a tank 23 integrated with each other, and a connecting portion 24 provided at the base of the hydraulic cylinder 21 is supported by a column 24A by a support shaft 24A. The connecting portion 26 provided on the piston rod 21A of the hydraulic cylinder 21 is connected to a connecting portion 27 provided on the boom 17 by a support shaft 26A. A lower limit detection switch 28 is provided on the connecting portion 27 of the boom 17, and the switch 28 is activated when it comes into contact with the upper surface of the tank 23 of the lifting device 18 to detect the lower limit position of the boom 17. .

As shown in FIGS. 4 and 5, the electric winch 30 has a connecting portion 35 connected to the mounting cover 34 by bolts 101 and can be mounted on the boom 17. The mounting cover 34 has the wire drum 31 and the speed reducer. Machine 3
6. The motor 37 is supported.

That is, the electric winch 30 is attached to the mounting cover 3.
4 is provided above the horizontal piece 34, one end of the rotating shaft 31A of the wire drum 31 is supported on the vertical piece 34B by a bearing 31B, and the other end of the rotating shaft 31A is connected to a worm gear box 41 described later. Through the bearings 31C, 3
Supported at 1C. The wire drum 31 has a key 38
To the shaft 31A. In FIG. 4, 39A is a drum cover, and 39B is a wire alignment plate repelled by a torsion spring.

The electric winch 30 is mounted on the mounting cover 3.
The worm gear box 41 of the speed reducer 36 is attached to the lower part of the horizontal piece 34A of 4 by bolts 102, and the motor 37 is attached to the worm gear box 41 by bolts 103.

Here, as shown in FIGS. 6 and 7, the speed reducer 36 includes an output shaft 37A of a motor 37 and a wire drum 31.
And the planetary gear reducer 51
And a two-stage reduction mechanism of a worm gear reducer 61.
The speed reducer 36 houses the worm gear speed reducer 61 in the worm gear box 41 and also houses the planetary gear speed reducer 51.

As shown in FIGS. 6 and 8, the planetary gear reducer 51 includes a sun gear 52 connected to the output shaft 37A of the motor 37, an internal gear 53 fixed to the worm gear box 41 by a set screw 104, and The worm gear reducer 61 includes a planetary gear 54 supported by carriers 55A and 55B meshed and connected to a worm shaft 62A of a worm 62 described later and meshed with the sun gear 52 and the internal gear 53. In addition, the planetary gear 54
The carrier is supported by carriers 55A and 55B via a planetary shaft 55C and a planetary roller 55D.

The worm gear reducer 61 includes a worm 62
And a worm wheel 63. Worm 62
Both ends of the worm shaft 62A are supported by bearings 62B provided on the worm gear box 41.
A is the carrier 55A of the planetary gear 54 as described above.
Is meshed and connected to the internal tooth portion 64B. The worm wheel 63 has a key 6 on the rotating shaft 31A of the wire drum 31.
5 are integrally connected. The worm gear box 41 has an oil chamber 66 in which the worm wheel 63 is immersed.
The rotary shaft 31A inserted in the worm gear box 41 is liquid-sealed by an oil seal 67 provided in the worm gear box 41. Both ends of the worm shaft 62A are also liquid-sealed by O-rings 68 provided on the worm gear box 41.

That is, in the electric winch 30, the sun gear 52 of the planetary gear reducer 51 is connected to the output shaft 3 of the motor 37.
7A, and the planetary gear 54 is arranged in a direction along the output shaft 37A of the motor 37. The worm gear reducer 61 connects the worm 62 to the carrier 55A for the planetary gear 54 of the planetary gear reducer 51, and connects the worm wheel 63 to which the rotating shaft 31A of the wire drum 31 is connected to the output shaft 37A of the motor 37. The output shaft 37A of the motor 37 is arranged orthogonally to the rotating shaft 31A of the wire drum 31 by being arranged orthogonally to the direction along the axis. Thereby, the motor 37
Of the output shaft 37 </ b> A along the longitudinal direction of the boom 17.

In the speed reducer 36, if the worm gear speed reducer 61 of the second stage has a large reduction ratio, the efficiency is reduced. Therefore, the reduction ratio of the planetary gear speed reducer 51 on the first stage is increased.
In the worm gear reducer 61, the efficiency is increased without increasing the reduction ratio too much. As a specific example, when the overall reduction ratio of the speed reducer 36 is 1/288, the planetary gear speed reducer 51 performs 1 / 4.8 reduction and the worm gear speed reducer 61 performs 1/60 reduction. This planetary gear reducer 5
Assuming that the worm gear reducer 61 is also decelerated by the worm gear reducer 61, the efficiency of the worm gear reducer 61 is reduced from 40% to 20%.
To 20%.

However, in the case of the speed reducer 36, when the reduction ratio of the worm gear speed reducer 61 is lowered to increase the efficiency, the lead angle of the worm 62 becomes large, and the self-locking property of the worm gear speed reducer 61 becomes weak. Reducer 61
Unless the self-locking property is increased by using a special material having a high friction coefficient as a constituent material of the worm 62 and the worm wheel 63), the braking function of the worm gear reducer 61 cannot be expected. The width of reduction must be appropriate. That is, the speed reducer 36 is set compact by using a small planetary gear reducer 51 that cannot take a large reduction ratio, and the efficiency is increased by appropriately setting the reduction ratio of the worm gear reducer 61 and self-locking is performed. A braking function shall be provided.

The crane device 10 is constructed by connecting the lifting device 18 and the electric winch 30 by an electric circuit shown in FIG.
It can be driven as shown in (B). (A) Driving of the lifting device 18 When the raising switch 81A of the controller 70 is turned on, the power supply 71 turns on the contact 82A of the relay 82,
As a result, the motor 83 of the pump 22 is rotated forward, the hydraulic cylinder 21 is extended, the boom 17 is raised, and the load can be lifted.

Lower switch 81B of controller 70
Is turned on, the power supply 71 turns on the contact 84A of the relay 84.
Is turned on, as a result, the motor 83 of the pump 22 is reversed, the hydraulic cylinder 21 is contracted, the boom 17 is lowered, and the load can be suspended. When the boom 17 reaches the lowermost position, the lowermost detection switch 28 is opened and the motor 37 is stopped.

(B) Driving of the electric winch 30 When the take-up switch 91A of the controller 70 is turned on, the power supply 71 turns on the contact 92A of the relay 92,
As a result, the motor 37 is rotated forward, the wire drum 31 winds up the wire 32, and the load can be lifted.

The unwinding-side switch 91B of the controller 70
Is turned on, the power supply 71 turns on the contact 93A of the relay 93.
Is turned on, and as a result, the motor 37 is rotated in the reverse direction, so that the wire drum 31 unwinds the wire 32 and the load can be suspended.

Here, as shown in FIG. 9, the lowermost limit detection switch 28 of the lifting device 18 is linked to the electric winch 30. When the boom 17 is at the lowermost position, the switch 28 is open. Even if the winding-side switch 91A of the controller 70 is turned on, the forward rotation of the motor 37 is stopped and the winding of the wire 32 onto the wire drum 31 is disabled.

Therefore, according to the present embodiment, the following effects are obtained. Rotary shaft 31A of wire drum 31 of electric winch 30
Are arranged perpendicular to the longitudinal direction of the boom 17, by providing a two-stage reduction mechanism of the planetary gear reducer 51 and the worm gear reducer 61 between the motor 37 and the wire drum 31, the worm of the worm gear reducer 61 is provided. The direction of the rotation center axis of the worm wheel 63 and the direction of the rotation center axis of the worm wheel 63 are changed by 90 degrees, and the output shaft 37A of the motor 37 is arranged orthogonally to the rotation shaft 31A of the wire drum 31.
The output shaft 37A of the motor 37 extends along the longitudinal direction of the boom 17. Therefore, the motor 37 is driven by the boom 17
For example, the space occupied by the on-vehicle crane device 10 in the vehicle is reduced (the effective cargo handling space of the vehicle is increased) without protruding significantly in the direction orthogonal to the longitudinal direction of the vehicle.

Since the worm gear reducer 61 is provided between the motor 37 and the wire drum 31, a brake function based on the self-lock of the worm gear can be provided without providing a special brake device.

Since a two-stage reduction mechanism of the planetary gear reducer 51 and the worm gear reducer 61 is provided between the motor 37 and the wire drum 31, a certain speed reducer is obtained by the planetary gear reducer 51 and the worm gear reducer 61 is provided. Can reduce the burden on the speed reducer, and as a result, the efficiency of the worm gear can be improved.

The electric winch 30 accommodates not only the worm gear reducer 61 but also the planetary gear reducer 51 in the worm gear box 41.
And the crane apparatus 10 can be made compact.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention.

[0037]

As described above, according to the present invention, the crane device can be made compact, and the electric winch of the crane device can be easily provided with a brake function.

[Brief description of the drawings]

FIG. 1 is a front view showing a vehicle-mounted crane device.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a schematic view showing a lifting device.

FIG. 4 is a front view showing the electric winch.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5;

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 4;

FIG. 8 is an exploded schematic view showing a planetary gear reducer.

FIG. 9 is an electric circuit diagram of the crane device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Crane apparatus 13 Mounting base 17 Boom 19 Pulley 30 Electric winch 31 Wire drum 31A Rotating shaft 36 Reduction gear 37 Motor 37A Output shaft 41 Worm gear box 51 Planetary gear reducer 52 Sun gear 54 Planetary gear 55A Carrier 61 Worm gear reducer 62 Worm 63 Worm

Claims (2)

[Claims] An electric winch is fixed to a boom provided to be pivotable with respect to a gantry, a rotation axis of a wire drum of the electric winch is orthogonally arranged in a longitudinal direction of the boom, and a wire unwound from the wire drum is boom. A crane device that can be wound around a pulley provided at the tip of the motor and that can be reeled out. A two-stage reduction of a planetary gear reducer and a worm gear reducer between the output shaft of the motor of the electric winch and the rotation shaft of the wire drum. The planetary gear reducer has its sun gear connected to the output shaft of the motor, its planetary gear is arranged along the motor output shaft, and the worm gear reducer has a worm in the carrier for the planetary gear of the planetary gear reducer. And the worm wheel to which the rotation axis of the wire drum is connected is arranged orthogonally to the direction along the output shaft of the motor. A crane apparatus characterized in that the output shaft of the motor is arranged orthogonal to the rotation axis of the wire drum. 2. The crane apparatus according to claim 1, wherein the electric winch houses a worm gear reducer in a worm gear box and also houses a planetary gear reducer.