JPH035393Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a spindle rotation transmission structure used in a turning machine tool.

<Prior art> Conventionally, the means for transmitting rotation to the main spindle used in turning machine tools is to attach a pulley directly to one rear end of the main spindle and to span a belt between it and the motor, which is the drive unit at the other end. , rotation was transmitted to the main shaft by driving a motor.

<Problems to be Solved by the Invention> However, in the conventional spindle rotation transmission structure, the pulley is fixed directly behind the spindle, so the tension from the belt is applied directly to the spindle. This not only puts a load on the bearing and causes it to generate heat, but also causes the bearing to play when rotated for a long period of time.

In addition, vibrations generated from the drive unit, such as the motor and belt, are directly transmitted to the main shaft, which adversely affects machining accuracy. Moreover, there is a problem in that the heat generation causes thermal displacement.

The purpose of this invention was proposed in order to solve the problem in view of the above circumstances, and the purpose of this invention is to transmit the rotation from the drive part to the main shaft not directly but indirectly, so that the belt tension load is applied to the bearing part. It is an object of the present invention to provide a spindle rotation transmission structure that does not cause vibration, does not transmit vibration to the spindle, and eliminates thermal displacement.

<Means and effects for solving the problems> The present invention is an improvement of the spindle rotation transmission structure, and the specific means thereof include a support base that supports the spindle, and a through hole in the center of the spindle that is connected to the rear of the spindle. a bearing support member inserted with a gap from the outer periphery of the support base and attached to the fixed part of the support base; a drive pulley rotatably supported by the bearing support member via a bearing; and a drive pulley attached to one end of the drive pulley. It consists of one coupling ring attached to the main shaft, and the other coupling ring attached to one end of the rear part of the main shaft.

Thus, the rotation from the drive pulley is transmitted to the main shaft by joining one coupling ring and the other coupling ring. Therefore, unlike the conventional drive pulley that rotates directly to the main shaft, rotation is transmitted through a coupling, so tension loads and vibrations applied to the drive pulley are not directly applied, resulting in uniform rotation. is given.

<Example> Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

The drawing is a sectional view of the headstock showing the present invention. In the figure, a support stand 2 is placed on a base 1, and a housing 3 is mounted on the support stand 2. A through hole 4 is bored in the axial center of the housing 3,
A sleeve 5 is fitted into the through hole 4. A through hole 6 is also formed in the axial center of the sleeve 5, into which a main shaft 9 is fitted via bearings 7 and 8. Main shaft 9
is supported and rotated by bearings 7 and 8.

Next, the rotation transmission structure of the main shaft, which is the main part of the present invention, will be explained.

A bearing support member 10 is loosely fitted into the rear part 9a of the main shaft 9, so that rotation is not transmitted from the bearing support member 10 to the rear part 9a of the main shaft 9. Bearings 11a and 11b are provided on the outer periphery of the bearing support member 10.
is fixed. At the rear of the bearings 11a, 11b, a nut 12 is screwed through a washer to a screw 10a carved in the rear end of the bearing support member 10, and by tightening the nut 12, the bearings 11a, 11b will play. It is fixed without any problem. The outer peripheries of the bearings 11a and 11b are fitted into a hollow member 13, and a drive pulley 15 is integrally attached to the hollow member 13 via a key 14, and the hollow member 13 and the drive pulley 15 are connected with bolts 16. be screwed on. A timing belt 17 is spanned between the drive pulley 15 and a drive motor (not shown).

One end of the drive pulley 15 is attached with one of the pair of couplings 18a, and a key 1 is attached to one end of the rear part 9a of the main shaft 9.
The other coupling ring 18b is integrally attached via 9. The rotation from the drive pulley 15 is transmitted to the rear part 9a of the main shaft 9 by joining the coupling ring 18a on one side and the coupling ring 18b on the other side. In addition, coupling rings 18a, 18b
is made of an elastic material and is designed to absorb vibrations.

The operation of the present invention will be explained.

Rotation is transmitted from a drive motor (not shown) to the drive pulley 15 via the timing belt 17 . The rotation transmitted to the drive pulley 15 is
One coupling 18a attached to one end of the
is integrally attached to the rear part 9a of the main shaft 9 via a key 19 and is connected to the other coupling 18b, whereby the rotation is transmitted to the rear part 9a of the main shaft 9, so that the main shaft 9 is rotated at a predetermined rotation speed.

Note that the rotation of the drive pulley 15 is supported by bearings 11a and 11b via the hollow member 13.

<Effects> The spindle rotation transmission structure of the present invention does not directly rotate the spindle from the drive pulley, but instead transmits rotation to the spindle via the coupling ring, so the tension load related to the drive pulley is not directly applied to the spindle. The pulley tension is not applied to the bearing that supports the main shaft, and almost no thermal displacement occurs. Furthermore, by using an elastic material such as rubber as the material of the coupling ring, vibrations transmitted to the drive pulley are absorbed by the coupling ring, so that vibrations do not occur in the main shaft.

By adopting the spindle rotation transmission structure of the present invention, even if the spindle is rotated for a long time, uneven rotation and vibration will not occur, so that machining accuracy will not deteriorate and good quality can be maintained.

Moreover, the bearing that supports the main shaft can withstand long-term use.

[Brief explanation of the drawing]

The drawing is a front sectional view of the headstock showing the present invention. 7, 8...Bearing, 9...Main shaft, 10...
Bearing support member, 11a, 11b...bearing,
12... Nut, 13... Hollow member, 15... Drive pulley, 17... Timing belt, 18a,
18b...Cup ring.

Claims (1)

[Scope of utility model registration request] a support base for supporting a main shaft; a shaft bearing support member inserted into a through hole in a shaft center portion with a gap from the outer periphery of the rear part of the main shaft and attached to a fixed portion of the support base;
It consists of a drive pulley rotatably supported by the bearing support member via a bearing, one coupling ring attached to one end of the drive pulley, and the other coupling ring attached to one end of the rear part of the main shaft. A main shaft rotation transmission structure characterized in that the rotation from the drive pulley is transmitted to the main shaft by being connected to the coupling ring.