JPH09242831A - Backlash reducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove backlash between a gear for load and a gear for driving the load by transmitting the rotation force of auxiliary gear rotatingly energized to one direction at all times by a motor for reducing backlash of smaller output type than a motor for driving the load. SOLUTION: On the inner wall 9a of sliding member 9, a motor 10 for reducing backlash of a smaller output type than a motor 3 for driving load is disposed in parallel with a rotation shaft 7. A gear for reduction 11 is provided at the motor 10, and the sliding member 9 is energized to one direction swingwise around the rotation shaft 7. Through a spring 15, a follower gear 14 and the shaft 7 are turned into a half clutch state through each slip disc 13. By driving the motor 10 to have the rotational direction by which an auxiliary gear 8 becomes load to the rotation of a load driving gear 1, backlash generating between the gear for load 1, a gear 4 for driving the load and the gear 8 can be removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlash reduction method, and more particularly, by transmitting an auxiliary gear that rotates in one direction to a load gear by a backlash reduction motor having a smaller output than that of a load drive motor. It relates to new improvements for eliminating backlash.

[0002]

2. Description of the Related Art As a backlash reduction method of this type that has been conventionally used, one of a pair of gears is always urged in one direction by a spring, and the other is a double gear superposed by being shifted from each other. A method of driving with a single gear and a method of driving with a double gear having different numbers of teeth have been adopted.

[0003]

Since the conventional backlash reducing method is configured as described above, there have been the following problems. That is, for example, when the load inertia is large (when the output of the load driving motor is relatively small with respect to the load), one gear must be urged to the other gear by using a strong spring. However, the size of the device became large and a contradiction with the output of the motor occurred, which was impossible to use in reality.

The present invention has been made to solve the above problems, and in particular, an auxiliary gear that rotates in one direction with a backlash reduction motor having a smaller output than the load drive motor is used as the load gear. It is an object of the present invention to provide a backlash reduction method for removing backlash by transmitting the backlash to the backlash.

[0005]

A backlash reduction method according to the present invention is a drive device for driving a load gear provided on a load shaft by a load drive gear of a load drive motor. A method for eliminating backlash between the load gear and the load drive gear by transmitting the rotational force of the auxiliary gear that is constantly urged to rotate in one direction by a low output backlash reduction motor to the load drive gear. is there.

More specifically, it is a method of swinging and urging the casing having the backlash reducing motor in one direction by using a spring around the axis of the auxiliary gear.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a backlash reducing method according to the present invention will be described in detail below with reference to the drawings. 1 is a load gear having a load shaft 2 connected to a load (not shown), and a load drive gear 4 of a load drive motor 3 meshes with the load gear 1. There is.

At a position adjacent to the load gear 1, a pair of cantilevered support plates 6 is provided on the fixed portion 5, and each support plate 6 is rotatably attached via a rotary shaft 7. An auxiliary gear 8 of a rotary shaft 7 provided is meshed with the load gear 1, and an oscillating body 9 having an overall U-shape is pivotally mounted on the rotary shaft 7 about the rotary shaft 7. It is provided.

A backlash reducing motor 10 having a smaller output than the load driving motor 3 is arranged on the inner wall 9a of the oscillating body 9 so that the rotating shaft 7 and its axial direction are parallel to each other. The reduction motor 10 is provided with a reduction gear 11, and the oscillating body 9 is oscillated and urged in one direction by the spring 12 with the rotating shaft 7 as the axis.

A driven gear 14 and a coil spring 15 sandwiched between a pair of slip disks 13 are provided in series in the axial direction inside the oscillating body 9 on the rotary shaft 7, and each slip is caused by the spring 15. The disk 13 is configured to receive preload, and the driven gear 14 and the reduction gear 11 mesh with each other. Therefore, the driven gear 14 and the rotary shaft 7 are not directly connected to each other, but the rotational force is transmitted to the rotary shaft 7 and the auxiliary gear 8 through the slip disks 13 in a known half-clutch state with slip. It is configured to be.

Next, the operation will be described. First, by driving the load driving motor 3 in the state of FIG. Backlash between the load gear 1 and the load drive gear 4 and the auxiliary gear 8 is eliminated. Further, the reduction gear 11 and the driven gear 14 are maintained in a backlash-free state by the spring 9 constantly urging the reduction gear 11 of the backlash reduction motor 10 in one direction by the spring 12. ing. Therefore,
The reaction force generated when the load driving motor 3 is stopped and the brake is applied is removed by the biasing force of the spring 12 so that the load shaft can be stopped without backlash.

[0012]

Since the backlash reduction method according to the present invention is configured as described above, the following effects can be obtained. That is, since the backlash reduction motor, which has a smaller output than the load drive motor, constantly transmits the rotational force of the auxiliary gear that is urged to rotate in one direction, to the load drive gear, Backlash can be eliminated. Further, since the backlash reduction motor is biased in one direction by using the spring, the reaction force generated when the load drive motor is stopped can be canceled, and the load shaft can be driven without backlash. .

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a backlash reduction method according to the present invention.

[Explanation of symbols]

 1 Load Gear 2 Load Shaft 3 Load Drive Motor 4 Load Drive Gear 9 Housing 10 Backlash Reduction Motor 8 Auxiliary Gear

Claims (2)

[Claims] 1. A drive device for driving a load gear (1) provided on a load shaft (2) by a load drive gear (4) of a load drive motor (3), wherein the load drive motor (3) The load gear (1) is transmitted by transmitting the rotational force of the auxiliary gear (8), which is constantly urged to rotate in one direction by a backlash reduction motor (10) having a smaller output than the load drive gear (4). ) And the load drive gear (4) are eliminated. 2. A housing (9) having the backlash reduction motor (10) is urged to oscillate in one direction by using a spring around the axis of the auxiliary gear (8). The backlash reduction method according to claim 1.