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CN-122003550-A - Shaft connecting mechanism

CN122003550ACN 122003550 ACN122003550 ACN 122003550ACN-122003550-A

Abstract

There is a need for a shaft coupling mechanism that reliably transmits power of a rotary shaft to a main shaft and is less susceptible to displacement of the main shaft in the axial direction. The shaft coupling mechanism includes a main shaft having a shaft hole, a coupling member having an inner hole, a rotary shaft insertable into the shaft hole and the inner hole, a1 st rolling element, and a2 nd rolling element, wherein the main shaft has a1 st inner groove, the coupling member has a2 nd inner groove, the rotary shaft has a1 st outer groove and a2 nd outer groove, the rotary shaft and the coupling member are coupled in an axial direction, the 1 st rolling element is disposed between the 2 nd outer groove of the rotary shaft and the 2 nd inner groove of the main shaft in a state in which the rotary shaft has been inserted into the shaft hole, and the 2 nd rolling element is disposed between the 1 st outer groove of the rotary shaft and the 1 st inner groove of the coupling member, whereby the rotary shaft and the main shaft are movable in the axial direction, and power of the rotary shaft is transmitted to the rotary shaft via the 1 st rolling element and the 2 nd rolling element.

Inventors

  • Ishiyama Naomi

Assignees

  • 发那科株式会社

Dates

Publication Date
20260508
Application Date
20231117

Claims (5)

  1. 1. A shaft coupling mechanism is provided with: A main shaft having a hollow shaft hole along an axial direction; a coupling member having a hollow inner hole portion along an axial direction and coupled to the spindle in the axial direction; A rotary shaft having an outer shape that is insertable into the shaft hole of the main shaft and the inner hole of the coupling member in a state where the main shaft and the coupling member are coupled in an axial direction; A1 st rolling element disposed between the main shaft and the rotary shaft, and A2 nd rolling element disposed between the coupling member and the rotating shaft, The spindle has a 1st inner groove portion on an inner peripheral surface of the shaft hole portion, the 1st inner groove portion being engageable with the 1st rolling element, The connecting member has a2 nd inner groove portion on an inner peripheral surface of the inner hole portion, the 2 nd inner groove portion being engageable with the 2 nd rolling element, The rotary shaft has a1 st outer groove part capable of engaging with the 1 st rolling element and a2 nd outer groove part capable of engaging with the 2 nd rolling element on the outer peripheral surface, The present invention provides a rotary machine in which the 1 st rolling element is disposed between the 2 nd outer groove portion of the rotary shaft and the 2 nd inner groove portion of the main shaft, and the 2 nd rolling element is disposed between the 1 st outer groove portion of the rotary shaft and the 1 st inner groove portion of the coupling member, in a state in which the main shaft and the coupling member are coupled in the axial direction, and the rotary shaft is inserted into the shaft hole portion of the main shaft and the inner hole portion of the coupling member, whereby the rotary shaft and the main shaft are movable in the axial direction, and the power of the rotary shaft is transmitted to the rotary shaft via the 1 st rolling element and the 2 nd rolling element.
  2. 2. The shaft coupling mechanism according to claim 1, wherein, The shaft coupling mechanism includes a phase adjustment unit that can adjust a phase of the spindle and the coupling member in a circumferential direction in a state in which the spindle and the coupling member are coupled in an axial direction and the rotation shaft is inserted into the shaft hole of the spindle and the inner hole of the coupling member.
  3. 3. The shaft coupling mechanism according to claim 2, wherein, The main shaft has a recess opening in the axial direction on the side of the connecting member, The connecting member has a convex portion protruding toward the spindle in the axial direction, The phase adjustment unit includes a 1 st pressing member that presses the 1 st rolling element in a 1 st direction and a 2nd pressing member that presses the 2nd rolling element in a 2nd direction opposite to the 1 st direction in a state in which the concave portion of the spindle and the convex portion of the coupling member are fitted in an axial direction.
  4. 4. A shaft coupling mechanism according to any one of claim 1 to 3, wherein, The 1 st rolling element and the 2 nd rolling element are arranged in plurality along the axial direction.
  5. 5. The shaft coupling mechanism according to any one of claims 1 to 4, wherein, The 1 st rolling element and the 2 nd rolling element are any one of spherical, cylindrical and barrel-shaped.

Description

Shaft connecting mechanism Technical Field The present disclosure relates to a shaft coupling mechanism. Background Conventionally, a mechanism has been proposed in which a rotary shaft of a rotary motor is coupled to a spindle of a spindle unit of a gripping tool in a machine tool to transmit power of the rotary motor to the spindle (see, for example, patent documents 1 and 2). Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 5-269605 Patent document 2 Japanese patent laid-open No. 2007-16833 Disclosure of Invention Problems to be solved by the invention When the rotating electric machine and the spindle unit are independently disposed, the joint is used as a member for connecting the rotating shaft of the rotating electric machine and the spindle of the spindle unit concentrically. However, when the rotary shaft and the main shaft are connected by the joint, the dimensions of the rotary shaft and the main shaft in the axial direction become long, and thus the dangerous rotational speed (rotational speed at which vibrations occur due to resonance) becomes low. As a result, in the rotating electrical machine, a limit is imposed on the upper limit of the rotational speed. In addition, if the dimensions of the rotary shaft and the spindle in the axial direction become long, the rotation characteristics may be adversely affected. On the other hand, by changing the structure of the joint, the axial dimensions of the rotary shaft and the spindle can be shortened. However, when the spindle is displaced so as to extend in the axial direction due to the heat influence during processing of the workpiece, the rotating shaft of the rotating electric machine is pushed in the axial direction by the displaced spindle, and thus there is a possibility that early damage of the rotating electric machine may occur. Further, in consideration of displacement of the spindle in the axial direction due to the influence of heat, a gap may be provided in advance between the spindle and the rotary shaft. However, if a gap is provided between the spindle and the rotary shaft, it is difficult to reliably transmit the power of the rotary shaft to the spindle. Accordingly, there is a demand for a shaft coupling mechanism that reliably transmits the power of a rotary shaft to a main shaft and is less susceptible to displacement of the main shaft in the axial direction. Solution for solving the problem The shaft coupling mechanism includes a main shaft having a hollow shaft hole portion in an axial direction, a coupling member having a hollow inner hole portion in the axial direction and coupled to the main shaft in the axial direction, a rotating shaft having an outer shape insertable into the shaft hole portion of the main shaft and the inner hole portion of the coupling member in a state in which the main shaft and the coupling member are coupled in the axial direction, a1 st rolling element disposed between the main shaft and the rotating shaft, a 2 nd rolling element disposed between the coupling member and the rotating shaft, the main shaft having a1 st inner groove portion engageable with the 1 st rolling element on an inner peripheral surface of the shaft hole portion, the coupling member having a 2 nd inner groove portion engageable with the 2 nd rolling element on an inner peripheral surface of the inner hole portion, the rotating shaft having a1 st outer groove portion engageable with the 1 st rolling element on an outer peripheral surface, and a 2 nd outer groove portion engageable with the 2 nd rolling element being disposed between the main shaft and the coupling member in the axial direction, and the coupling member having a power transmitting portion between the 1 st rolling element and the inner groove portion and the rotating shaft 2 through the inner groove portion 1. Drawings Fig. 1 is a schematic diagram of a motor 10 and a spindle unit 20 connected by a shaft connection mechanism according to embodiment 1. Fig. 2A is a partially enlarged view of fig. 1. FIG. 2B is a cross-sectional view s1-s1 of FIG. 2A. Fig. 3 is an exploded perspective view of the shaft coupling mechanism of embodiment 1. Fig. 4 is a plan view of the rotary shaft 11 viewed from the X2 side. Fig. 5 is a plan view of the main shaft 21 viewed from the X2 side. Fig. 6A is a plan view of the coupling member 30 viewed from the X2 side. Fig. 6B is a plan view of the coupling member 30 viewed from the X1 side. Fig. 7 is a perspective view of the shaft coupling mechanism of embodiment 1. Fig. 8 is a diagram illustrating the direction in which the main shaft 21 and the coupling member 30 are pressed. Fig. 9 is a perspective view of the shaft coupling mechanism of embodiment 2. Fig. 10 is a perspective view of the shaft coupling mechanism according to embodiment 3. Fig. 11 is a perspective view of the shaft coupling mechanism according to embodiment 4. Fig. 12A is a conceptual sectional view showing the structure of the sh