TWI611862B - Transmission structure of rotary table - Google Patents

Abstract

The invention provides a transmission structure of an indexing plate, which includes: a screw connected to a power source, the screw is provided with a first threaded portion and a second threaded portion in the axial direction, wherein the spiral of the first threaded portion and the first threaded portion The spiral lines of the two threaded portions are staggered with each other; and a main spindle connected to the indexing turntable, and a plurality of bearings are provided on the spaced ring of the main spindle, and each of the bearings is respectively engaged with the first threaded portion and the second threaded portion. The direction in which the parts engage each bearing is opposite to the direction in which the second threaded portion engages each bearing; thereby, there is no problem of backlash between the screw and the main spindle, so as to improve the processing accuracy.

Description

Transmission structure of index plate

The invention relates to an indexing disc structure, in particular to a transmission structure of an indexing disc without backlash.

The indexing dial is an indispensable kit in automated machinery. For precision processing, assembly, production, etc., the indexing dial can be used to produce indexing and positioning functions. The indexing dial is used to precisely control the rotation of the table. According to the cutting angle required for processing, the relative angular displacement of the table can be controlled to achieve precise positioning processing.

Please refer to FIG. 1 is a transmission structure of a conventional indexing disk, which includes: a worm 1 provided with a thread 2; a worm wheel 3 having a circumferential ring with thread teeth 4; when a power source drives the worm 1 to rotate, The thread 2 meshes with the thread teeth 4 of the worm wheel 3, so that the worm wheel 3 drives the indexing turntable for indexing and positioning. However, when the worm 1 and the worm wheel 3 mesh with each other, there is a gap between them. No matter when the worm 1 is moving forward or backward, the thread 2 only meshes with the single tooth surface of the thread tooth 4. Under long-term meshing, it will cause wear and form backlash. , Reduce accuracy, reduce overall structural rigidity, reduce torque, and make transmission less accurate, prone to vibration and other problems.

In order to reduce the error caused by backlash, it is necessary to frequently stop the maintenance and related calibration procedures, resulting in complicated processing procedures; therefore, how to improve the backlash of the index plate to improve the processing accuracy needs to be resolved by the relevant industry.

In order to solve the above problem, the present invention provides a transmission structure of an indexing plate. The spiral of the first threaded portion and the spiral of the second threaded portion are staggered from each other. When each bearing is separated from the first threaded portion and the second threaded portion, respectively During meshing, the direction in which the first threaded portion engages each bearing is opposite to the direction in which the second threaded portion engages each bearing, whereby the first threaded portion and the second threaded portion are simultaneously engaged on the opposite sides of the bearing to compensate the screw and The clearance when the main mandrel meshes, so that there is no backlash between the screw and the main mandrel to improve the machining accuracy.

In order to achieve the above object, the present invention provides a transmission structure of an indexing plate, which includes: a screw connected to a power source, the screw is provided with a first screw portion and a second screw portion in the axial direction, wherein the first screw portion The spiral line of the second threaded portion is staggered with the spiral line of the second threaded portion; and a main mandrel connected to the indexing turntable, and a plurality of bearings are provided on the spaced ring of the main spindle. The direction in which the first threaded portion engages each bearing is opposite to the direction in which the second threaded portion engages each bearing.

Preferably, the screw has a shaft, the first threaded portion is fixed to the shaft, and the second threaded portion is detachable from the shaft.

Preferably, an elastic member is provided between the first threaded portion and the second threaded portion, wherein the elastic member is a disc spring plate.

Preferably, the first threaded portion and the second threaded portion are connected to each other by a positioning member, wherein the positioning member is disposed axially with respect to the screw, and one end of the positioning member is slidably disposed on the second threaded portion. A positioning pin is passed between one end and the first threaded portion.

Preferably, the axial direction of each bearing is perpendicular to the axial direction of the screw.

Preferably, the first screw portion and the second screw portion are external threads.

With the above, the present invention can achieve the effect that the elastic member will stagger the spiral line of the first threaded portion and the spiral line of the second threaded portion with each other, and the direction in which the first threaded portion engages each bearing and the second threaded portion engages each bearing. The directions are opposite, whereby the first threaded portion and the second threaded portion are simultaneously engaged on the surfaces in the opposite direction of the bearing to compensate for the gap when the screw is engaged with the main spindle, so that no backlash can be generated between the screw and the main spindle. It can reduce the error situation caused by wear, which can improve the machining accuracy.

In addition, when the screw is engaged with the main mandrel, one end of the positioning member slides in the second receiving groove, thereby providing an elastic space of the elastic member, and when the first thread portion and the second thread portion are engaged with the bearing. , Has a space for movement, thereby avoiding abrasion of the screw and the main mandrel, causing damage to the screw or the main mandrel.

In order to facilitate the description of the central idea of the present invention in the above-mentioned summary of content, specific embodiments are described below. Various objects in the embodiments are drawn according to the proportions suitable for enumeration, rather than the proportions of the actual components, which will be described beforehand.

Please refer to FIG. 2 to FIG. 5. The present invention provides a transmission structure of an indexing plate, which is disposed on a mounting base 200, and one side of the mounting base 200 is provided with a power source 201 for driving a power source 201. Indexing turntable 202. In the present invention, the power source 201 is a motor, and the transmission structure includes:

A screw 10 is provided on the mounting base 200 and is connected to the power source 201. The screw 10 has a rod shaft 11 and a first threaded portion 12 and a second threaded portion 13 disposed axially with respect to the screw 10. The first threaded portion 12 is fixed on one side of the shaft 11, and the second threaded portion 13 can be separated from the other side of the shaft 11. The first threaded portion 12 and the second threaded portion 13 are external threads.

Furthermore, an elastic member 20 is provided between the first threaded portion 12 and the second threaded portion 13, and the elastic member 20 is axially penetrated on the shaft 11. The elasticity of the elastic member 20 makes the first The spiral line of the threaded portion 12 and the spiral line of the second threaded portion 13 are staggered from each other. In the present invention, the number of the elastic members 20 is three, and the elastic members 20 are stacked on the shaft 11, and the elastic member 20 is a dish type. Spring leaf.

In addition, the first threaded portion 12 and the second threaded portion 13 are connected to each other by a positioning member 30, and the positioning member 30 is disposed axially relative to the screw 10. One end of the positioning member 30 is slidably disposed on the second threaded portion 13. On the periphery, a positioning pin 31 is inserted between the other end of the positioning member 30 and the first threaded portion 12 so that the first threaded portion 12 rotates with the shaft 11 and the second threaded portion 13 rotates while the shaft 11 generates relative to the screw 10 Axial movement.

In the embodiment of the present invention, a peripheral edge of the first threaded portion 12 is recessed with a first receiving groove 121 relative to the axial direction of the screw 10, and a peripheral edge of the second threaded portion 13 is recessed with a second relative to the axial direction of the screw 10. The accommodating slot 131 is located in the second accommodating slot 131. The positioning member 30 is provided with a perforation 32. The first accommodating slot 121 is provided with a positioning hole 122. The perforation 32 corresponds to the positioning hole 122. The positioning pin 31 is penetrated in the perforation 32 and the positioning hole 122 in a radial direction relative to the screw 10, so that the first threaded portion 12 rotates with the shaft 11 and the second threaded portion 13 rotates while the shaft 11 generates relative to the screw. In the axial movement of 10, when the power source 201 drives the screw 10 to rotate, the first threaded portion 12 and the second threaded portion 13 will rotate simultaneously, and the second receiving groove 131 provides a sliding space for the positioning member 30.

A main mandrel 40 is connected to the indexing turntable 202, and a plurality of bearings 41 are provided at intervals of the main mandrel 40. The axial direction of each bearing 41 is perpendicular to the axial direction of the screw 10, and the axial direction of each bearing 41 The axis of the degree turntable 202 is the same. Therefore, during processing and manufacturing, the same axis can be used for processing without reversing processing, thereby unifying the attack method, reducing processing procedures and man-hours, and thereby reducing manufacturing and processing costs. .

Furthermore, as shown in FIGS. 4 and 5, when the power source 201 drives the screw 10 to rotate, the elastic member 20 staggers the spiral line of the first threaded portion 12 and the spiral line of the second threaded portion 13 with each other, and the first thread The portion 12 engages the right side of the bearing 41, and the second threaded portion 13 engages the left side of the bearing 41, thereby driving the indexing turntable 202 to rotate. When the screw 10 is engaged with the main spindle 40, the second threaded portion 13 is The bearing 41 is restricted to the rod shaft 11 and does not disengage from the rod shaft 11. As a result, the first threaded portion 12 and the second threaded portion 13 are simultaneously engaged with the surfaces of the bearing 41 in opposite directions to compensate the screw 10 and the main spindle 40. The gap during meshing prevents backlash between the screw 10 and the main mandrel 40, which can reduce errors caused by wear and thereby improve machining accuracy.

In addition, when the screw 10 is engaged with the main mandrel 40, the first threaded portion 12 and the second threaded portion 13 are not in contact with the peripheral surface of the bearing 41 at the connection interval, and the first threaded portion 12 and the second threaded portion 13 are in contact with the bearing 41. There is a gap between them, and one end of the positioning member 30 slides in the second receiving groove 131, thereby providing the elastic space of the elastic member 20 and the movement space of the second threaded portion 13. Therefore, whether the screw 10 advances or When moving backward, the second threaded portion 13 can be moved within the distance between each bearing 41 to reduce the wear of the screw 10 and the main spindle 40, causing damage to the screw 10 or the main spindle 40, thereby increasing the service life.

The above-mentioned embodiments are only used to illustrate the present invention, and are not intended to limit the scope of the present invention. Various modifications or changes which do not violate the spirit of the present invention belong to the scope of the present invention.

＜ Learning ＞
1‧‧‧ worm
2‧‧‧Thread
3‧‧‧ worm gear
4‧‧‧Threaded teeth
200‧‧‧ Mount
201‧‧‧ Power source
202‧‧‧ indexing turntable
10‧‧‧ Screw
11‧‧‧ lever shaft
12‧‧‧first thread
121‧‧‧ the first receiving slot
122‧‧‧ Positioning hole
13‧‧‧Second thread section
131‧‧‧Second accommodation slot
20‧‧‧Elastic piece
30‧‧‧ Positioning piece
31‧‧‧positioning pin
32‧‧‧perforation
40‧‧‧ main mandrel
41‧‧‧bearing

FIG. 1 is a schematic view showing the engagement of a conventional worm with a main spindle. Fig. 2 is a perspective view of the present invention. FIG. 3 is an exploded view of the present invention. Figure 4 is a schematic partial cross-sectional view of the present invention, showing the engagement of the screw with the main spindle. FIG. 5 is a partially enlarged view of FIG. 4.

200‧‧‧ Mount

201‧‧‧ Power source

202‧‧‧ indexing turntable

10‧‧‧ Screw

12‧‧‧first thread

13‧‧‧Second thread section

40‧‧‧ main mandrel

41‧‧‧bearing

Claims (10)

An indexing plate transmission structure includes a screw connected to a power source. The screw is provided with a first threaded portion and a second threaded portion in the axial direction. The spiral line of the first threaded portion and the second threaded portion. The spirals of the two parts are staggered with each other, the first threaded part and the second threaded part are connected to each other by a positioning member, one end of the positioning member is slidably disposed on the second threaded portion, and the other end of the positioning member is fixed on the A first threaded portion, wherein an elastic member is provided between the first threaded portion and the second threaded portion; and a main mandrel connected to the indexing turntable, the main mandrel spacer ring is provided with a plurality of bearings, and each of the bearings is respectively Engage with the first threaded portion and the second threaded portion, wherein the direction in which the first threaded portion engages each of the bearings is opposite to the direction in which the second threaded portion engages each of the bearings. The transmission structure of the index plate according to claim 1, wherein the screw has a shaft, and the first threaded portion is fixed to the shaft. The transmission structure of the index plate according to claim 2, wherein the elastic member is axially disposed on the rod shaft. The transmission structure of the index plate according to claim 1 or 3, wherein the elastic member is a disc spring plate. The transmission structure of the index plate according to claim 1, wherein the positioning member is disposed axially with respect to the screw. The transmission structure of the index plate according to claim 1 or 5, wherein a positioning pin is inserted between one end of the positioning member and the first threaded portion. The transmission structure of the index plate according to claim 6, wherein a peripheral edge of the first threaded portion is recessed with respect to the axial direction of the screw, and a first receiving groove is recessed, and the positioning pin is penetrated by the radial direction with respect to the screw. Set in Between the positioning member and the first receiving groove. The transmission structure of the indexing plate according to claim 6, wherein a peripheral portion of the second thread portion is recessed with respect to an axial direction of the screw, and a second receiving groove is recessed, and the positioning member is slidably disposed in the second receiving portion. In the slot. The transmission structure of the index plate according to claim 1, wherein an axial direction of each of the bearings is perpendicular to an axial direction of the screw. The transmission structure of the index plate according to claim 1, wherein the first threaded portion and the second threaded portion are external threads.