JP3916231B2 - Welding machine drive structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drive unit structure of a welding machine in which a pressure shaft is driven by driving an electric motor.
[0002]
[Prior art]
Conventionally, a ball screw shaft is rotated from the output shaft of an electric motor through a coupling and a bearing shaft, and the ball nut is screwed into a screw formed on the ball screw shaft to reciprocate. This is a welder drive structure that drives the pressure shaft. The coupling is splined, and the output shaft, coupling, bearing, and ball nut are located in series on the same axis. Some are arranged (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent No. 2844412 (page 3, FIG. 2)
[0004]
[Problems to be solved by the invention]
However, in the above conventional example, the output shaft, coupling, bearing, and ball nut constituting the drive unit are sequentially arranged in series on the same axis, so the ball nut operates at a position away from the bearing in the axial direction. As a result, the overall length of the drive unit becomes longer, which makes it difficult to operate the welder, and even if the welder enters the jig during welding work, And cannot perform many welding spot operations. In addition, since the coupling is a spline coupling type, a processing time for forming the spline is required, and a certain degree of sealed chamber for housing the coupling is necessary for lubrication of the spline portion, which increases the cost. There is a problem that the drive unit structure becomes.
[0005]
The present invention has been made in view of the above-described problems of the prior art. The object of the present invention is to use a leaf spring as a coupling, and a ball nut in a hollow shaft for bearings. It is intended to provide a drive unit structure for a welding machine with a low-cost manufacturing cost in which the entire length of the drive unit is short and compact, and the operation of the pressure shaft is easy. is there.
[0006]
In addition, the drive unit structure of the welding machine is designed so that the ball screw shaft can be manually rotated when an electric motor or other drive unit fails, and the drive unit can be easily restored to its original state. It is something to be offered.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the drive unit structure of the welding machine according to the present invention has a coupling plate spring connected to the output shaft of the electric motor, a bearing hollow shaft connected to the plate spring, and A ball nut, a ball screw shaft, a leaf spring, and the output shaft are arranged on the same core as the bearing hollow shaft, and the ball screw shaft is fixed to the hollow shaft for bearing, and a ball screw A ball screw into which the ball nut is screwed into the bearing hollow shaft is formed on the shaft.
[0008]
Further, a processing hole for manual operation for manually rotating the ball screw shaft is formed on the free end side of the ball screw shaft.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of a main part of a drive unit structure of a welding machine according to the present invention, FIG. 2 is a cross-sectional view of a main part of another embodiment, and FIG. 3 is a cross-sectional view of a main part of still another embodiment.
[0010]
In FIG. 1, reference numeral 1 denotes an electric motor attached to a welding machine, and an output shaft 2 is rotatably provided on the output side of the electric motor 1. Reference numeral 3 denotes a coupling leaf spring. The leaf spring 3 is connected to the output shaft 2 via a sheath tube 5 fastened to the output shaft 2 by bolts 4.
[0011]
Reference numeral 6 denotes a bearing hollow shaft of the angular bearing 7, and a ball screw shaft 9 is fixed to an end portion of the hollow portion 8 of the bearing hollow shaft 6. A ball nut 12 fixed to the pressure shaft 11 is screwed onto the screw screw 10. A ball screw 10 to which the ball nut 12 is screwed is formed up to the inside of the hollow portion 8.
[0012]
The output shaft 2, the leaf spring 3, the ball screw shaft 9, the ball nut 12 and the pressure shaft 11 are arranged concentrically in the axial direction of the bearing hollow shaft 6.
[0013]
Reference numeral 13 denotes a bearing for the pressurizing shaft 11, 14 denotes a drive unit housing, and the pressurizing shaft 11 can be applied to driving of a welding electrode or driving for equalizing a welding machine.
[0014]
When the electric motor 1 is driven from the state where the bearing hollow shaft 6 and the ball nut 12 overlap on the same core as shown in FIG. The rotation of the output shaft 2 rotates the ball screw shaft 9 via the leaf spring 3 and the bearing hollow shaft 6, and the ball screw shaft 9 advances to the left in the drawing by the rotation of the ball screw shaft 9. The pressure shaft 11 moves along with the ball nut 12 to increase the amount of protrusion from the drive unit housing 14.
[0015]
According to the present invention, the leaf spring 3 is used as a coupling, and the ball nut 12 can be screwed into the ball screw 10 even in the hollow shaft 6 for the bearing. It becomes a compact configuration.
[0016]
Reference numeral 15 denotes a processing hole for manual operation formed on the free end side of the ball screw shaft 9, which is formed in a hexagonal hole, for example. A manual operation hole 16 for attaching a spanner or the like to the processing hole 15 is passed through the tip of the pressure shaft 11.
[0017]
As described above, when the hole 15 for manual operation for manually rotating the ball screw shaft 9 is formed on the free end side of the ball screw shaft 9, the electric motor 1 and other driving units are provided. In this case, the ball screw shaft 9 can be manually rotated at the time of failure, so that the drive unit can be easily restored to its original state.
[0018]
Further, in the case of this embodiment, when the output shaft 2 of the electric motor 1 is relatively long, a hollow portion 17 is formed on the end side of the ball screw shaft 9, and a part of the output shaft 2 is formed. When the output shaft 2 is placed concentrically with the bearing hollow shaft 6 by being placed in the hollow portion 17, the overall length of the drive portion is further shortened and a compact configuration is obtained.
[0019]
The embodiment shown in FIG. 2 is different from the previous embodiment in that a split ring 20 is used as a connecting means between the output shaft 2 and the leaf spring 3, and the other components are substantially the same in configuration. A description thereof will be omitted.
[0020]
In this embodiment, the split ring 20 is fastened and attached to the base side of the output shaft 2 by a clamp bolt 21, and the leaf spring 3 is attached to the split ring 20.
[0021]
The operation and effect of this embodiment are substantially the same as those of the previous embodiment.
[0022]
The embodiment shown in FIG. 3 is applied to a case where the output shaft 2 is relatively short, and is different from the previous embodiments in that the leaf spring 3 is directly connected to the output shaft 2 by a bolt 30. Since the other components are substantially the same, the same reference numerals are given and description thereof is omitted.
[0023]
In the case of this embodiment, since the output shaft 2 is relatively short, the entire length of the drive portion is short without forming a hollow portion on the end side of the ball screw shaft 9 as in the previous embodiments. And compact configuration.
[0024]
【The invention's effect】
In the present invention, a leaf spring is used as a coupling, and the ball nut can be screwed into the ball screw even in the hollow shaft for the bearing. A drive structure for a welding machine with a low manufacturing cost and easy operation of the pressure shaft can be obtained.
[0025]
When a hole for manual operation that manually rotates the ball screw shaft is formed on the free end side of the ball screw shaft, it is manually operated when an electric motor or other drive unit fails. As a result, the ball screw shaft can be rotated to obtain the drive unit structure of the welding machine in which the drive unit can be easily restored to its original state.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a drive unit structure of a welding machine according to the present invention.
FIG. 2 is a cross-sectional view of an essential part of another embodiment of the drive unit structure of the welding machine according to the present invention.
FIG. 3 is a cross-sectional view of a main part of still another embodiment of the driving unit structure of the welding machine according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electric motor 2 Output shaft 3 Leaf spring 6 Hollow shaft for bearing 7 Bearing 9 Ball screw shaft 10 Ball screw 11 Pressure shaft 12 Ball nut

Claims (2)

The ball screw shaft screw is rotated from the output shaft of the electric motor through the coupling and bearing shaft, and the pressure shaft is driven by the reciprocating motion of a ball nut screwed to the ball screw. In the drive part structure of the welding machine thus constructed, a coupling leaf spring is connected to the output shaft of the electric motor, a bearing hollow shaft is connected to the leaf spring, A ball nut, a ball screw shaft, a leaf spring, and the output shaft, and the ball screw shaft is fixed to the bearing hollow shaft, and the ball screw shaft is disposed in the bearing hollow shaft. A drive part structure for a welding machine, wherein a ball screw into which the ball nut is screwed is formed. 2. A drive unit structure for a welding machine according to claim 1, wherein a processing hole for manual operation for manually rotating the ball screw shaft is formed on a free end side of the ball screw shaft.

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