KR20030056279A - A Backlash Eliminating Device Using Double Pinion Of A Rotary Table - Google Patents

Abstract

PURPOSE: A device for removing backlash is provided to remove the backlash and to prevent overshooting by engaging a ring gear with a first pinion and a second pinion, simultaneously. CONSTITUTION: A ring gear(400) is installed at a rotary shaft in a table. A first pinion(110) is installed at one side of a first shaft(100), and is engaged with the ring gear. A first helical gear(120) is installed at the other side of the first shaft. A second pinion(210) is installed at one side of a second shaft(200), and is engaged with the ring gear. A second helical gear(220) is installed at the other side of the second shaft. A motor rotates a third helical gear(310) engaged with the first helical gear and second helical gear.

Description

A backlash eliminating device using double pinion of a rotary table

The present invention relates to a backlash removal device, and more particularly, by using a double pinion in which a first pinion and a second pinion are simultaneously engaged by a ring gear arranged on a rotation axis of a table. The present invention relates to a backlash removing apparatus using a double pinion in a rotary table that removes backlash in the forward and reverse directions by allowing the backlash and the backlash directions of the second pinion and the ring gear to be opposite to each other.

1 is a structural diagram of a conventional rotary table using one pinion.

In the related art, as shown in FIG. 1, the rotary table 10 on the rotary base 20 rotates in a sliding motion to transmit gear power to the rotation of the servo motor 30 mounted on the rotary base 20. Rotation force is transmitted to the pinion 40 by using. In addition, the rotation force of the pinion 40 is rotated on the rotary base 20 by the rotary table 10 by being meshed with the ring gear 50 connected to the rotary table 10 as a fixed element.

In the structure as described above, the pinion 40 is engaged by the ring gear 50 and is rotated, so that the gears and the gears in the bite, there is a gap between the gears and the gears. Due to the gear and the tooth space of the gear, backlash occurs when the rotation direction is changed. This backlash is inevitably increased as the machine ages, which is inevitably larger.

Therefore, the problem of the conventional rotary table 10 rotation is complicated structure, the backlash of the pinion 40 and the ring gear 50 is large, it is difficult to precise position control, and to change the rotation direction of the rotary table 10 In case of continuous processing, overcut phenomenon occurs at the change of direction.

Accordingly, the present invention has been made in view of the above-described conventional problems, and the first object of the present invention is that the first pinion and the second pinion are simultaneously meshed by a ring gear built on a rotating shaft of the table. The backlash of the first pinion and the ring gear and the backlash of the second pinion and the ring gear are positioned opposite to each other to remove the backlash in the forward and reverse directions, and to eliminate the overshooting phenomenon during the accurate position control and the change of direction. It is to provide backlash removal device using double pinion to rotary table.

In addition, the second object of the present invention is a piston structure capable of raising the lower side of the two shafts to a predetermined pressure, so that the second helical gear having the helix angle of the two shafts can be removed by adjusting the interval of the backlash while rotating in the spiral direction. It is to provide backlash eliminator with double pinion in rotary table.

The objects of the present invention are ring gears arranged on a rotating shaft of a table;

A first shaft having a first pinion meshed with the ring gear and a first helical gear provided at the other side;

A second shaft having a second pinion meshed with the ring gear, and a second helical gear provided at the other side;

A third helical gear that is simultaneously driven by the first helical gear and the second helical gear is a three-axis reducer that is rotated by a servo motor; and achieved by a backlash removing device using a double pinion on a rotary table. do.

And, the lower side of the two shafts is characterized in that provided with a piston for raising the two shafts to a predetermined pressure.

In addition, the lower side of the two shafts is characterized in that the stopper is provided with a lock nut for restricting the piston from rising above a predetermined height.

The motor may be a servo motor, and a three-axis reducer may be further provided between the motor and the third helical gear to reduce the rotational force of the motor.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

1 is a structural diagram of a rotary table of a conventional method using one pinion,

2 is an explanatory diagram illustrating a principle of a backlash removing apparatus using a double pinion in a rotary table according to the present invention;

3 is a plan view of the backlash removal apparatus using a double pinion in a rotary table according to the present invention,

4 is a structural diagram of a backlash removing device using a double pinion in a rotary table,

5 is a detailed structural diagram of an apparatus for removing backlash using a double pinion in a rotary table.

<Description of the symbols for the main parts of the drawings>

10: Rotary Table 20: Rotary Base

30: servo motor 40: pinion

50: ring gear

100: 1 axis 110: first pinion

120: first helical gear 200: 2 axes

210: second pinion 220: second helical gear

300: 3-axis reducer 310: third helical gear

400: ring gear 410: table

420: base 500: piston

510: lock nut 520: stopper

530: bearing 540: cover

550: Cylinder 560: Servo Motor

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Figure 2 is a schematic diagram illustrating the principle of a backlash removal apparatus using a double pinion in a rotary table according to the present invention, Figure 3 is a plan view of the backlash removal apparatus using a double pinion in a rotary table according to the present invention, Figure 4 is a rotary table It is a structural diagram of the backlash removing device using the double pinion.

FIG. 4 illustrates one axis 100, two axis 200, and three axis reducer 300 in a line for explanation.

As shown in Figures 2 and 3 and 4, the present invention is the ring gear 400 is installed on the axis of rotation of the table 410, one side of the shaft 100 and the ring gear 400 and A first pinion 110 to be engaged is provided and a first helical gear 120 is provided at the other side. In addition, a second pinion 210 which is meshed with the ring gear 400 is provided on one side of the two shafts 200, and a second helical gear 220 is provided on the other side of the shaft 200 to the ring gear 400. The first pinion 110 and the second pinion 210 are meshed at the same time.

In addition, the third helical gear 310 of the three-axis reducer 300 rotated by the motor is simultaneously engaged by the first helical gear 120 and the second helical gear 220 to the first helical gear 120. And the second helical gear 220 are configured to rotate at the same time. At this time, it is preferable that the motor uses the servo motor 560.

The present invention configured as described above is a structure in which the table 410 rotates on the base 420 in a sliding motion, and the servo is rotated by the servo motor 560 attached to the base 420. The rotational force of the motor 560 is transmitted to the three-axis reducer 300 assembled in the base 420.

In addition, the rotational force of the three-axis reducer 300 is transmitted to the third helical gear 310 fixed with bolts, and the rotational force at this time is crushed by the first helical gear 120 and the second helical gear 220. Are delivered at the same time. Each rotational force transmitted simultaneously to the first helical gear 120 and the second helical gear 220 is the first pinion 110 and the first pinion 110 connected to the first and second helical gears 120 and 220 as power transmission elements, respectively. 2 pinions are delivered.

At this time, the rotational force of the first pinion 110 and the second pinion 210 are simultaneously meshed by the ring gear 400 and transmitted to the ring gear 400 to be assembled / fixed with the ring gear 400 and the bolt. The table 410 is rotated. In this case, in order to remove the backlash of the ring gear 400 and the pinion, the pinion which is bitten by the ring gear 400 is used to simultaneously transmit the rotational force by using the first pinion 110 and the second pinion 210. It is.

The backlash elimination principle of the above structure will be described in more detail below.

As shown in FIG. 2, the first shaft 100 and the second shaft 200 transmit rotational force to the ring gear 400 in the same direction by the rotation of the three-axis reducer 300. At this time, the backlash of the first pinion 110 and the ring gear 400 and the backlash of the second pinion 210 and the ring gear 400 are positioned opposite to each other to remove each backlash in the forward and reverse directions. It also eliminates overshooting when turning.

Therefore, if the backlash between the first pinion 110 and the ring gear 400 is removed by contacting one direction during assembly, the backlash of the second pinion 210 and the ring gear 400 is minimized when assembling. do.

However, as described above, the method of assembling to the minimum is difficult, and it is difficult to continuously supplement it after use. Complementing this difficulty was adjusted by placing a piston 500 structure for pushing the two shaft 200 in the lower portion of the two shaft (200).

Hereinafter, the structure thereof will be described in more detail with reference to the accompanying drawings.

5 is a detailed structural diagram of an apparatus for removing backlash using a double pinion in a rotary table according to the present invention.

FIG. 5 illustrates one axis 100, two axis 200, and three axis reducer 300 in a line.

As shown in FIG. 5, when a fluid pressure is applied to a cover 540 assembled to the lower cylinder 550 of the two shafts 200 through a pipe, this force pushes up the piston 500 to the upper surface. In addition, the pushing force is transmitted to the second pinion 210 by a bearing 530, and the bearing 530 also enables rotation of the second pinion 210. The second helical gear 220 fixed to the second pinion 210 as a power transmission element and having a spiral angle is pushed up. At this time, the first helical gear 120 and the third helical gear 310 should be fixed so as not to rotate.

As the second helical gear 220 is pushed up, the second helical gear 220 and the second pinion 210 are rotated in the spiral direction of the spiral angle by the spiral angle. At this time, as shown in FIG. 2, the second pinion 210 rotates in the direction of the backlash between the second pinion 210 and the ring gear 400, thereby removing the backlash.

Here, the pushing force is the pinion of the first pinion 110, the second pinion 210 and the ring gear 400 when the table 410 rotates, the load is increased during rotation. As shown in FIG. 5 in order to remove such a jamming phenomenon, the lower surface of the two shafts 200 has a stopper 520 which prevents the piston 500 from going up a predetermined distance or more. The stopper 520 has a lock nut 510 to adjust the backlash by loosening or tightening the lock nut 510 while applying fluid pressure.

As described above, according to the backlash removing apparatus using the double pinion in the rotary table according to the present invention, the first pinion 110 and the second pinion 210 are connected to the ring gear 400 arranged on the rotation axis of the table 410. ) Are simultaneously squeezed so that the backlash of the first pinion 110 and the ring gear 400 and the backlash directions of the second pinion 210 and the ring gear 400 are located opposite to each other. Therefore, it is possible to provide a backlash elimination device using a double pinion in a rotary table that eliminates backlash in the forward and reverse directions, and eliminates overshooting during accurate position control and redirection.

In addition, a piston 500 structure capable of raising the lower side of the two shafts 200 to a predetermined pressure allows the second helical gear 220 having the spiral angle of the two shafts 200 to rotate in the helical direction, thereby preventing backlash. Backlash adjustment device that can be removed by adjusting the interval makes it easy to adjust the backlash after long-term use of the machine.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, various other modifications and variations may be made without departing from the spirit and scope of the invention. Accordingly, it is intended that the appended claims cover such modifications and variations as fall within the true scope of the invention.

Claims (5)

A ring gear 400 arranged on an axis of rotation of the table 410; A first shaft (100) having a first pinion (110) engaged with the ring gear (400) and a first helical gear (120) provided at the other side thereof; A second shaft 200 having a second pinion 210 engaged with the ring gear 400 and a second helical gear 220 provided at the other side; A backlash removal device using a double pinion in a rotary table, comprising; a motor for rotating the third helical gear 310 that is simultaneously engaged by the first helical gear 120 and the second helical gear 220. . The apparatus of claim 1, wherein a piston (500) for raising the two shafts (200) to a predetermined pressure is provided below the two shafts (200). The stopper 520 of claim 1 or 2, wherein a lock nut 510 is provided at the lower side of the two shafts 200 to restrict the piston 500 from rising above a predetermined height. Backlash eliminator using double pinion on rotary table. 2. The apparatus of claim 1, wherein the motor is a servo motor (560). The double pinion of the rotary table according to claim 1 or 4, further comprising a three-axis reducer 300 between the motor and the third helical gear 310 to reduce the rotational force of the motor. Backlash removal device used.