JP2000302380A - Electric winch - Google Patents

Abstract

(57) [Problem] To provide an electric winch in which a motor of a driving source is downsized. SOLUTION: A sun gear 52 of a planetary gear transmission mechanism 50 is connected to an output shaft 38 of an electric motor 30 and a satellite gear 5 is provided.
3 and the input shaft 20 of the worm gear transmission mechanism 10 connected to the center shaft of the worm gear transmission mechanism 10,
0 is provided with the winding drum 2 linked to the output shaft 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric winch, and more particularly to an electric winch used for powering a mini crane that can be mounted on a light truck or the like.

[0002]

2. Description of the Related Art A conventional electric winch is disclosed in, for example,
This is known from Japanese Patent Application Laid-Open No. 5-172277 or Japanese Utility Model Application Laid-Open No. Sho 56-10491.

[0003]

In these publications, a reduction gear is a combination of an internal gear and an external gear,
Or, it is a planetary gear, which has a low gear ratio and hinders miniaturization of the electric motor. Also, a relay for controlling the on / off of the motor has a large inrush current of the motor, and it is inevitable that the motor becomes larger.

[0004] The present invention has been made in view of such circumstances, and has as its object to provide an electric winch in which a motor of a driving source is downsized.

[0005]

To achieve the above object, the present invention provides an electric winch having a motor and a winding drum for winding a wire, comprising: a first reduction gear having a planetary gear transmission mechanism; Second having worm gear transmission mechanism
, The sun gear of the planetary gear transmission mechanism is connected to the output shaft of the motor, and the output shaft linked to the satellite gear shaft of the planetary gear transmission mechanism and the input shaft of the worm gear transmission mechanism are The technical means of fixing the winding drum to the output shaft of the mechanism and adding a double reduction mechanism and a self-locking mechanism was adopted.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

FIG. 1 is an explanatory view of a small crane on which the electric winch of the present invention is mounted, FIG. 2 is a view of the electric winch according to the embodiment of the present invention viewed from the direction of arrow A in FIG. 1, and FIG. B-
FIG. 4 is a sectional view taken along line B-C of FIG. 2.

First, referring to FIG.
Is a pin 104 at the tip of the vertical structure 102
The arm is rotatable, and the arm angle and the expansion and contraction can be performed by driving means (not shown). The electric winch 1 of the present invention is fixed to the arm 103 with bolts 105 near the base of the arm 103.
The hook 107 is fixed to the wire 3 wound around the winding drum 2 via a pulley 106 at the tip of the arm 103. In addition, a control harness 3 for power supply and control is connected from the electric winch 1 to a controller 108 connected to a lower portion of the vertical structure 102.

Referring to FIG. 2 and subsequent figures, the base 4 of the electric winch 1 and the mounting stay 5 having a substantially rectangular hollow section are provided with bolts 6.
And the nut 7, and is fixed to the arm 103 by the bolt 105 via the columnar structure 8 provided in the mounting stay 5 as described above. A worm gear transmission mechanism 10 is fixed to the base 4 with a plurality of bolts 11, and an output shaft 12 of the worm gear transmission mechanism 10 crosses the worm gear transmission mechanism 10. The winding drum 2 is fixed in the circumferential direction of the output shaft 12, and the stop key 14 is fitted into a key groove 13 provided on the outer circumference of the output shaft 12 and the inner circumference of the winding drum 2, so that the winding drum 2 slides. Has been prevented.

The winding drum 2 has its base 4 covered with a cover 15 so that a part of the winding drum 2 is exposed, and one end of the wire 3 is connected to the small crane 1 from the exposed portion as described above.
01 extends in the direction of the pulley 106. The other end of the wire 3 wound around the winding drum 2 is fixed to the winding drum 2 with a wire stopper 16 at the bottom of the winding drum 2. In order to prevent the wire 3 wound around the winding drum 2 from being loosened, a wire pressing plate 17 rotatably supported on the base 4 is provided. Is in contact with the center of a spring 18 for pressing the wire pressing plate 17 against the wire 3 with an appropriate pressure. In addition,
Both ends of the spring 18 are supported by holes 19 formed in the base 4.

A surface of the worm gear transmission mechanism 10 from which the input shaft 20 protrudes is fixed by bolts 21 from the inner surface of a housing 31 of the electric motor 30 and is connected to a yoke 33 via a bracket 32. The control harness 3 extends from the bracket 32 to the outside via a grommet 34.

Referring to FIG. 4, the yoke 33 of the electric motor 30 will be described.
Are the housing 31 and the bolt 35 with the bracket 32 interposed therebetween.
The planetary gear transmission mechanism 50 is fixed in the housing 31 with screws 51. A plurality of permanent magnets 36 are fixed to the inner peripheral surface of the yoke 33 of the electric motor 30, and the permanent magnet 36 has an armature 37 on the inner peripheral side of the permanent magnet 36 via a gap. One end of 38 is rotatably supported by a self-aligning bearing 39 provided on the bottom surface of the cup-shaped yoke 33, and the other end is a bracket 32.
And is connected to a sun gear 52 of a planetary gear transmission mechanism 50 through a bearing 40 and an oil seal 41 provided in the transmission. A center axis of the input shaft 20 of the worm gear transmission mechanism 10 passes through an oil seal 43 provided in a hole 42 formed in the housing 31 on an output plate 54 supporting a plurality of satellite gears 53 meshing with the sun gear 52. Are fitted.

The case 22 of the worm gear transmission mechanism 10 is provided with a bearing 23 that supports the intermediate portion and the other end of the input shaft 20 of the worm gear transmission mechanism 10. A C-shaped retaining ring 24 for holes is provided at the other end of the input shaft 20 of the worm gear transmission mechanism 10 to prevent the worm gear transmission mechanism 10 from coming off in the axial direction. Is secured. Double bearing 23 of input shaft 20
A worm gear 26 is formed between the worm gear 26 and meshes with a spur gear 27 provided continuously with the winding drum 2 to form a reduction mechanism together with the planetary gear transmission mechanism 50 for rotating the armature output shaft 38 of the electric motor 30. .

Next, the operation of this embodiment will be described. An operator operates the controller 108 of the small crane 101 to move the hook 107 up and down in accordance with a command.
The electric motor 30 rotates forward or backward, and the rotation of the armature output shaft 38 of the electric motor 30 is transmitted to the planetary gear electric mechanism 50, and is reduced by a fraction. Further, the rotation is reduced by the worm gear transmission mechanism 10 and the rotation direction is set to 90 degrees.
The degree is converted and transmitted to the winding drum 2. Therefore, the wire 3 wound around the winding drum 2 is unwound or wound up, and the hook 107 of the small crane 101 moves up and down.

The slack of the wire 3 is prevented by the wire pressing plate 17 provided on the base 4 and pressed by the spring 18. Also, the reaction force due to the load of the load or the like suspended from the hook 107 is supported by the stop key 14, the worm gear 26 and the spur gear 27 provided on the winding drum 2, so that the planetary gear transmission mechanism 50 and the electric motor It does not reach 30.

Further, since the reduction mechanism of the rotation of the armature output shaft 38 of the motor 30 is constituted by the planetary gear transmission mechanism 50 and the worm gear transmission mechanism 10, the reduction ratio can be increased and the torque of the motor 30 can be increased. Since the motor 30 can be reduced in size and weight and the inrush current at the time of starting the motor 30 can be reduced, the controller 1
08, which does not adversely affect the contacts of a relay that electrically connects the electric motor, thereby contributing to a longer life.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

[0018]

The present invention comprises a first reduction gear having a planetary gear transmission mechanism and a second reduction gear having a worm gear transmission mechanism, and connects the sun gear of the planetary gear transmission mechanism to the output shaft of the motor. At the same time, the output shaft linked to the satellite gear shaft of the planetary gear transmission mechanism and the input shaft of the worm gear transmission mechanism are connected, and the winding drum is fixed to the output shaft of the worm gear transmission mechanism to provide a double reduction mechanism and a self-locking mechanism. With this addition, a large reduction ratio can be obtained, and a margin for the torque of the electric motor can be secured. Therefore, it is possible to reduce the size and weight of the electric motor and reduce the inrush current at the time of starting the electric motor.

Further, when lifting or hanging a load or the like by a crane, the speed of the wire is reduced, so that there is no need for fine adjustment, the number of startups is reduced, the sound is small, the quietness is high, and the durability is improved. Can be done.

Further, the reaction force due to the load of the load or the like suspended on the wire is supported by the stop key, the worm gear and the spur gear provided on the winding drum, so that the braking force can be improved.

In addition, the adoption of the worm gear transmission mechanism causes the output shaft of the motor to be in the same direction as the arm of the crane, so that the motor does not hinder the rotation of the arm, and the rotation of the arm becomes a wide angle. Is improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a small crane on which an electric winch of the present invention is mounted.

FIG. 2 is a diagram viewed from the direction of arrow A in FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a sectional view taken along line CC of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Electric winch 2 ... Winding cylinder 3 ... Wire 10 ... Worm gear transmission mechanism (2nd reduction gear) 12 ... Output shaft of worm gear transmission mechanism 20 ... Worm gear transmission Mechanism input shaft 30 Electric motor 38 Armature output shaft 50 Planetary gear transmission mechanism (first reduction gear) 52 Sun gear 53 Satellite gear 54 Output plate

Claims (1)

[Claims] 1. An electric winch having an electric motor and a winding drum for winding a wire, a first reduction gear having a planetary gear transmission mechanism and a second reduction gear having a worm gear transmission mechanism.
And a sun gear of the planetary gear transmission mechanism is connected to an output shaft of the electric motor, and an output plate interlocked with a satellite gear shaft of the planetary gear transmission mechanism is connected to an input shaft of the worm gear transmission mechanism. An electric winch wherein the winding drum is fixed to an output shaft of the worm gear transmission mechanism, and a double reduction mechanism and a self-locking mechanism are added.