WO2004048793A1

WO2004048793A1 - Gear coupling

Info

Publication number: WO2004048793A1
Application number: PCT/JP2003/014599
Authority: WO
Inventors: Akihide Sato
Original assignee: Kabushiki Kaisha Yaskawa Denki
Priority date: 2002-11-20
Filing date: 2003-11-17
Publication date: 2004-06-10
Also published as: JP2004169815A; TW200416357A

Abstract

A gear coupling capable of enhancing accuracy in a shaft connection and extending life of a bearing. In a gear coupling, an internal teeth gear (2) and an external teeth gear (1) engage with each other with clearance and transmit torque, the gears can slide in a thrust direction, and a lubricant (5) for lubrication between engaging surfaces (4) is sealed in the clearance between the internal teeth gear (2) and the external teeth gear (1). A lubricant storage (6) having a greater capacity than the clearance between the internal teeth gear (2) and the external teeth gear (1) is provided in an inner face of the internal teeth gear (2). The above structure can compensate generated thrust force, preventing the thrust force from being applied to a main shaft or motor shaft of a machine tool.

Description

Specification

Gear-coupling

[Technical field]

The present invention relates to a gear coupling used for connecting shafts. [Background technology]

Conventionally, a gear coupling has been used as a joint for connecting a main shaft of a machine tool or the like (for example, Patent Document 1). Fig. 3 shows a cross-sectional view of the main part of a conventional gear coupling, and Fig. 4 shows the state of force in the thrust direction at high speed rotation.

3 and 4, 1 is an external gear, 2 is an internal gear, 3 is a motor shaft, 4 is a mating surface, 5 is lubricating oil, 6 is lubricating oil reservoir, and 7 is O for sealing lubricating oil. The ring, 8 is centrifugal force, and 9, 10 are thrust ka.

In such a configuration, the lubricating oil 5 sealed for lubrication of the mating surface 4 is pressed in the outer peripheral direction by the centrifugal force 8 during high-speed rotation. As a result, the centrifugal force 8 is distributed to the thrust car 9 on the external gear 1 and the thrust car 10 on the internal gear 2.

However, such a conventional technique has the following problems.

(1) The thrust force 9 is applied to the 內 gear 1 and holds the internal gear 1. For this reason, for example, the machine tool spindle is pressed, and the spindle is displaced, thereby deteriorating accuracy.

(2) Further, the thrust force 10 holds the respective gears 1 and 2. For this reason, for example, it may act on the motor shaft 3 and act as a load on the motor's bearing, thereby shortening the life of the bearing or causing burnout.

[Disclosure of the Invention]

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a gear force coupling that can improve the accuracy of shaft connection and extend the life of a bearing. .

In order to solve the above-mentioned problems, the present invention has a structure in which an internal gear and an external gear engage with each other by skimmer fitting to transmit torque and can slide in a thrust direction, and A lubrication oil in which a lubricating oil is sealed in a gap between the internal gear and the external gear, and a lubricating oil pool on the inner surface of the internal gear, which has a volume equal to or larger than a gap between the internal gear and the external gear. Is provided.

As a result, the generated thrust force can be offset, and the applied thrust force can be prevented from being applied to, for example, the main shaft of the machine tool or the motor shaft.

As described above, according to the present invention, the thrust force can be offset in the gear coupling, the accuracy can be improved and the life of the bearing can be extended without applying thrust force to the holding component. effective. [Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a gear coupling according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a main part showing a state of internal pressure in a thrust direction during high-speed rotation of the gear coupling of FIG. FIG. 3 is a cross-sectional view showing a main part of a gear coupling according to the related art. FIG. 4 is a cross-sectional view of a main part showing a state of an internal pressure in a thrust direction during high-speed rotation of the gear coupling of FIG.

'' [Best mode for carrying out the invention]

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a cross-sectional view showing a main part of a gear force coupling according to an embodiment of the present invention, and FIG.

In Figures 1 and 2, 1 is the external gear, 2 is the internal gear, 3 is the motor shaft, 4 is the mating surface, 5 is the lubricating oil, 6 is the lubricating oil reservoir, and 7 is O for sealing lubricating oil. Ring, 8 is centrifugal force,

9, 10 is the thrust force.

In such a configuration, the lubricating oil 5 for lubrication of the mating surface 4 collects in the lubricating oil reservoir 6. Here, since the volume of the lubricating oil reservoir 6 is set to be equal to or greater than the volume of the gap between the mating surfaces 4, all the lubricating oil 5 enters the lubricating oil reservoir 6.

The lubricating oil 5 is pressed in the outer circumferential direction by the centrifugal force 8 during high-speed rotation. As a result, the centrifugal force 8 is distributed to the thrust force 9 and the thrust force 10 as before, but both are applied to the internal gear 2 and are offset as internal pressure, so that the thrust is not applied to the gear holding component. No force is applied. Thereby, the above-described problem of the related art is solved. In addition, when the rotation speed decreases, the centrifugal force 8 applied to the lubricating oil 5 decreases, so that the lubricating oil 5 cannot be pressed against the outer periphery, and the lubricating oil 5 moves to the four mating surfaces, so that lubrication does not deteriorate. .

[Industrial applicability]

INDUSTRIAL APPLICABILITY The present invention is applied to the field of manufacturing and providing a gear coupling that can be applied to a gear coupling used for connecting shafts to improve the accuracy of shaft connection and extend the life of a bearing. be able to.

Claims

The scope of the claims

1. The internal gear and the external gear mesh with each other by the clearance to transmit torque and have a structure that can slide in the thrust direction. In the gear coupling enclosed in the gap between the tooth gear and the external gear,

A gear coupling, wherein a lubricating oil reservoir having a volume equal to or larger than a gap between the internal gear and the external gear is provided on an inner surface of the gear.