JPS60201112A - Bearing device with position adjusting mechanism in the axial direction - Google Patents

Abstract

PURPOSE:To facilitate centering alignment work by meshing the driving gear with a screwed driven gear fitted on the rotary shaft with capability of axially moving together with the shaft through the shaft supporting part, and by putting said screwed part in engagement with a fixed housing. CONSTITUTION:A ring-shaped driven gear 12 having at a portion of its periphery a screwed part 12a is fitted on a rotary shaft 2 through a bearing 11 capable of receiving the force both in the radial and thrust directions. This gear 12 is borne by a fixed housing 14 in screw engagement with said screwed part 12a and coupled with a driving gear 16 mounted at the shaft end for a location adjustment drive motor 17 through an intermediate gear 15 fitted in said housing 14. When this location adjustment drive motor 17 is actuated, the abovementioned ring-shaped driven gear 12 is rotated through the driving gear 16 and intermediate gear 15, and the screw action given with the fixed housing 14 moves the ring-shaped gear 12, bearing 11 and rotary shaft 2 in the axial direction.

Description

[Detailed description of the invention] do.

The axial positioning, or position adjustment, of rotating mechanical parts supported by bearings has traditionally been done by adjusting dimensional tolerances and shims during processing. In most cases, sufficient accuracy can be obtained using this method, and there are no particular problems in use. In the device,
This method cannot be used. For example, if a rotating wheel type continuous extruder is operated and the rotating wheel position moves in the axial direction with respect to the fixed shoe, not only will a good amount of formation not be obtained, but the wheel will fit into the outer groove of the wheel. The clearance between the shoe and the seal block or the protrusion with the orifice changes, making extrusion unstable. Moreover, in some cases, accidents such as tool damage may occur due to burning. In order to prevent this, it is necessary to automatically restore the center deviation during operation of the device depending on the deviation of the center.

The present invention has been made to address such problems, and an object of the present invention is to provide a bearing device that can easily center a pivotally supported mechanical component in the axial direction.

Hereinafter, the present invention will be described with reference to the drawings.

The illustrated embodiment is one in which the present invention is applied to a rotary wheel type continuous extruder. Fig. 1 is a longitudinal sectional view of the bearing device of the present invention, and Fig. 4 is a cross sectional view of the rotary wheel type continuous extruder. be. Note that although FIG. 4 is a cross-sectional view taken along the line A--A in FIG. 1, the fixing shoe portion of the continuous extruder is not shown in FIG. 1 for clarity. To briefly explain the rotary wheel type continuous extruder with reference to FIG. 4, an annular groove 3 is formed on the outer circumferential surface of a wheel 1 fixed to a rotating shaft 2, and a groove 3 contacts a part of the outer circumferential surface of the wheel. A protrusion 5 and a seal block 9 that fit into the groove 3 are formed on the lower surface of the curved fixing shoe 4. An opening 8 is formed in the upper part of the fixed shoe 4 into which the raw material 10 to be extruded is introduced.

In the illustrated example, the protrusion 5 is formed with an orifice 6 for extruding the molded product. The raw material 10 injected through the opening 8 of the fixed shoe is filled between the lower surface of the fixed shoe, the groove 3 of the wheel 1, the projections 5 at both ends of the fixed shoe, and the seal block 9, and as the wheel 1 rotates in one direction. Pressure is applied by the frictional resistance of the free wall surface, and the extrusion molded product is continuously obtained by being extruded along the orifice 6 of the protrusion 5.

In such a rotary wheel type continuous extruder, the center position of the concave groove of wheel 1 (C in Figure 1) may change due to thermal expansion or other causes during operation.
If the position (position) is deviated in the axial direction with respect to the fixed shoe, accidents such as sticking and breakage of the shoe will occur as described above. The bearing device of the present invention corrects this axial deviation of the rotating portion.

Referring to FIGS. 1 to 3, a rotating shaft 2 holding a wheel 1 is supported on both sides of the wheel 1, and one shaft end 2a of the rotating shaft 2 is connected to a rotational drive device (not shown) via a coupling 7. connected. As shown in FIG. 3, the drive side shaft end 2a of the rotating shaft 2 is a spline shaft, and a coupling 7
The shaft end 2b (
(FIG. 1) is supported freely in the axial direction, so that the rotating shaft 2 can be moved in the axial direction. A bearing device according to the present invention is provided at a shaft support portion between the wheel 1 and the coupling 7 (drive side shaft support portion).

One rotation shaft 2 in the drive side shaft support portion.

A driven annular gear 12 having a threaded portion 12a' is attached to a part of the outer periphery via a bearing 11 that can receive forces in radial and thrust directions. 12b is a tooth portion of the gear 12. The annular gear 12 is connected to the IIQ11 by a fixed nousing 14 that threadably engages with the threaded portion 12a of the gear.
The gear 12 is also connected to a drive gear 16 provided at the shaft end of a position adjustment drive motor 17 via an intermediate gear 15 mounted on a nousing 14. The position adjustment drive motor 17 is attached to the housing 14, and may also be used with a reduction gear, a brake device, etc.

In such a configuration, when the position adjustment drive motor 17 is driven, the driven annular gear 12 rotates via the driving gear 16 and the intermediate gear 15, and the annular gear 12 and the bearing rotate due to the screw action between the fixed housing 14 and the fixed housing 14. 11 and the rotating shaft 2 move together in the axial direction. As a result of this, the wheel 1 fixed to the rotating shaft 2 also moves in one direction. Therefore, due to thermal deformation of the wheel 1 and its surrounding parts, the center of the concave groove 3 of the wheel 1 is fixed at the fixed point 4 (the fourth
When there is a deviation in the axial direction with respect to the figure), the center position can be corrected by rotating the position adjustment drive motor 17 and moving the rotary shaft 2 in the opposite direction to the deviation direction by an amount corresponding to the deviation amount. It can be performed. In addition, when performing such centering, the deviation of a reference position on the rotating shaft 2, for example, the center position of the wheel 1 fixed to the shaft, is detected by some method, and this detection signal is used as a feedback signal to drive the position adjustment drive motor. It is preferable to control the amount of rotation such as.

In the above embodiment, 120 rotations of the ring gear are performed via the motor 17, but if the ring gear is used only for initial setting or in the case of a small bearing device, some kind of rotation may be required after the gear is rotated manually. The gear may be fixed by locking means such as a lock nut. Furthermore, the present invention can be applied not only to the rotary wheel type extruder as in the above embodiment, but also to support mechanisms for rolls in rolling mills, straightening machines, etc. Also in such cases, the axial centering of the rolls is controlled by shims. Simple 11- can also be done during operation without using etc.

[Brief explanation of drawings]

FIG. 1 is a partial vertical sectional view of a bearing device with an axial position adjustment mechanism according to an embodiment of the present invention, FIG. 2 is a partial front view as seen from arrow F in FIG. 1, and FIG. FIG. 4 is a longitudinal cross-sectional view of the driving side shaft end of the rotary shaft, and FIG. 4 is a schematic cross-sectional view of the rotary wheel type continuous extruder. l...Wheel, 2...Rotating shaft, 11...Bearing, 14...Housing, 15...Intermediate gear, 1
6... Drive gear. Sub-Agent Patent Attorney Rikichi Someyo Figure 1 Figure 2

Claims (1)

[Claims] a threaded driven gear mounted on the outer periphery of a rotating shaft via a shaft support so as to be integral with the shaft and movable in the axial direction; and a fixed housing that threadably engages with a threaded portion of the threaded driven gear. A bearing device with an axial position adjustment mechanism, comprising: a drive gear that meshes with the threaded driven gear.