JPH07291575A - Reduction gear in automatic crane - Google Patents

Abstract

PURPOSE:To enable automatic highly accurate traverse traveling of an automatic crane by a means for adjustably minimizing back-lash in a driving reduction gear in the automatic crane and with simple constitution. CONSTITUTION:In order to adjust the backlash 10 between a pinion 8 and gear 9 in a final reduction gear 2 for driving an automatically traversely traveling crane, an eccentric sleeve 13 as a means for moving a pinion shaft and gear shaft close to each other is provided in the bearing part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed reducer in an automatic crane which reduces the backlash of the speed reducer when driving the automatic crane and enables highly accurate automatic lateral traveling.

[0002]

2. Description of the Related Art Conventionally, the drive of an automatic crane has been traveling and traversing from a motor via a speed reducer. The reduction gear is configured so that a plurality of gears are meshed with each other and the rotational force of a motor that rotates at a high speed is transmitted to a wheel for traveling or traverse at a required rotational speed.

[0003]

Since a gear type speed reducer generally uses involute gears, a slight gap is generated between the gears, which causes a back crash. However, since the speed reducer of the conventional automatic crane is not provided with means for adjusting the backlash to the minimum, it is difficult to perform highly accurate automatic lateral traveling due to the backlash.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drive speed reducer for an automatic crane with means capable of adjusting backlash to a minimum, and with a simple structure to enable highly accurate automatic lateral traveling.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and in order to adjust the backlash between a pinion and a gear in a speed reducer for driving a crane that travels automatically, a pinion shaft is used. As a means to bring the gear shaft relative to or the pinion shaft relative to the gear shaft relatively close to each other,
The gist is that an eccentric sleeve is provided on the bearing portion.

[0006]

[Operation] An eccentric sleeve for adjusting the center distance between the pinion and gear is provided on the outer circumference of one or both of the pinion shaft and gear shaft in the automatic crane drive speed reducer.
As a result, the backlash between the pinion and gear is adjusted to the minimum, enabling highly accurate automatic lateral traveling in the automatic crane.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A speed reducer in an automatic crane according to the present invention, in which backlash can be adjusted by a simple device, will be described below with reference to an embodiment shown in the drawings. In the figure, reference numeral 1 denotes a traveling motor, and the driving force of the traveling motor 1 is transmitted to a traveling driving wheel 3 through a driving speed reducer 2 and the crane 4 starts traveling.

The crane travels on the drive wheels 3 for traveling and the driven wheels 5 for traveling. The traveling position of the crane is detected by an encoder 6 attached to the driven wheels 5, and is automatically provided on the crane 4. The controller 7 is adapted to automatically position the crane position.

A plurality of pinions 8 and gears 9 are arranged in the drive speed reducer 2 so as to mesh with each other so as to reduce the high speed rotation of the motor to a required number of revolutions. However, backlash 1 between pinion 8 and gear 9
If 0 exceeds a desired value, that is, if the backlash is larger than the allowable value, the load on the driving force of the traveling motor 1 changes abruptly, which causes a large speed fluctuation disturbance to the speed control system of the traveling motor 1. Since the gain of the speed control system cannot be set in order to make full use of the performance of the traveling motor 1 to prevent this, the positioning accuracy of the crane 4 is reduced as a result.

Similarly, the existence of the backlash 10 is
The performance deterioration of the position control system of the crane 4 controlled by the feedback signal from the encoder 6 also occurs as in the case of the speed control.

Therefore, in order to improve the accuracy of the automatic positioning control of the crane 4, the backlash 1 of the drive reducer 2 is used.
It is necessary to make 0 as small as possible. Therefore, according to the present invention, the eccentric sleeve 13 is provided between the outer periphery of the bearing bearing 11 of the pinion 8 and the reduction gear casing 12, and the eccentric sleeve 13 is rotated with respect to the casing 12 so that the center between the pinion 8 and the gear 9 is rotated. By making the distance 14 small, the backlash 10 can be made smaller.
It is adjusted to 0a.

After the adjustment, the eccentric sleeve 13 is fixed to the casing 12 by the pin 15 so as not to rotate. In this way, the backlash of the speed reducer can be freely adjusted to a desired value.

[0013]

The speed reducer in the automatic crane of the present invention is
As a means for bringing the pinion shaft supporting the pinion and the gear in the reducer that drives the horizontally traveling crane, respectively, or the pinion shaft relative to the gear shaft relatively close to each other, the eccentric sleeve is provided in the bearing part, so the deceleration It can be freely adjusted to minimize backlash between the machine pinion and gear. By reducing the backlash, the speed of the drive motor and the disturbance to the position control system can be reduced, so that the gain of the control system can be set high. Further, since the gain setting can be set high, there are advantages such as highly accurate automatic traverse and traveling.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an entire automatic crane of the present invention.

FIG. 2 is a schematic side view showing a traveling unit of the automatic crane.

FIG. 3 is a sectional view of a speed reducer.

FIG. 4 is a view taken along line BB in FIG.

[Explanation of symbols]

 1 Travel Motor 2 Reducer 3 Travel Drive Wheel 4 Crane 5 Travel Drive Wheel 6 Encoder 7 Automatic Control Device 8 Pinion 9 Gear 10 Backlash 11 Bearing Bearing 12 Reducer Casing 13 Eccentric Sleeve 14 Center Distance Between Pinion and Gear 15 Pin

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[Procedure amendment]

[Submission date] August 11, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is an overall view of an automatic crane of the present invention, (1) is a schematic explanatory view, and (2) is a schematic side view showing a traveling unit.

FIG. 2 shows a speed reducer, (1) is a sectional view and (2) is B-
It is an arrow line view by the B line.

[Explanation of symbols] 1 traveling motor 2 reduction gear 3 traveling drive wheel 4 crane 5 traveling driven wheel 6 encoder 7 automatic control device 8 pinion 9 gear 10 backlash 11 bearing bearing 12 reduction gear casing 13 eccentric sleeve 14 between pinion and gear Center distance of 15 pins

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

Claims (1)

[Claims] 1. A bearing as means for bringing a gear shaft relative to a pinion shaft or a pinion shaft relative to a gear shaft relatively close to each other in order to adjust a backlash between a pinion and a gear in a speed reducer for driving a crane that travels automatically laterally. An eccentric sleeve is provided on a section of the reducer for an automatic crane.