JPH0614953Y2 - Combined bearing device for press machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a combined bearing device including a slide bearing and a rolling bearing.

[Prior Art] A large number of bearing devices are used in a press machine, and its load bearing capacity is considerably larger than that of a general machine. In addition, as a condition of the bearing device, it is often required that the load direction is intermittently changed or that the radial movement of the shaft is suppressed to a small amount.

For example, a bearing device 10 for rotatably supporting the crankshaft 1 (eccentric portion 1E) of the press machine (crown 2, slider 3, slide guide 4, connecting rod 5, column 6, bed 7, bolster 8) shown in FIG. In this case, a downward load W equal to the weight of the slide 3 or the like is applied in the unloaded state, and a large upward press load F is applied during press working.

Therefore, as shown in FIG. 4, a so-called combined bearing device 10 in which a slide bearing 11 and a rolling bearing 21 are provided side by side.
Was devised and is disclosed as Japanese Utility Model Laid-Open No. 63-89423.

In FIG. 1, a combined bearing 10 includes a rolling bearing 21 whose purpose is mainly to regulate the amount of movement of the shaft 1.
Sliding bearings 11 mainly intended to increase load bearing capacity
And are arranged such that the centers of the inner diameters (axis lines Z2, Z1) are the same.

Therefore, although the amount of movement of the shaft 1 can be regulated by the rolling bearing 21, the clearance C between the sliding bearing 11 and the shaft 1 is the same over the entire circumference, so that the lubricating oil supplied into the clearance C is sufficiently pressurized. Is not generated and the load bearing capacity is not satisfactory.

[Problems to be Solved by the Invention] As described above, the above structure has the following problems.

The hydraulic pressure generated in the slide bearing 11 is constant over the entire circumference. However, when the shaft 1 is the crank shaft of a press machine, the press load F in FIG. 3 is significantly larger than the driven weight W.

Therefore, since the hydraulic pressure value must be set high enough to withstand the press load F, there is a lot of waste such as that the lubricating oil supply means must be of high pressure and large capacity.

On the other hand, adopting a structure in which the load bearing capacity is increased by taking measures such as increasing the amount of deformation of the rolling bearing 21 results in a special rolling bearing, resulting in high cost. Moreover, if the amount of deformation of the rolling elements is approved, it becomes impossible to satisfy the demand for higher precision of the press machine.

That is, in the case of the crankshaft 1, the amount of vertical movement in FIGS. 3 and 4 directly appears as a change in die height.

Further, even when the load bearing capacity of the shaft 1 only in the specific radial direction is increased and the movement amount is decreased, it is necessary to take measures in the omnidirectional direction, so that the device becomes oversized.

An object of the present invention is to provide a combined bearing device capable of minimizing the radial movement amount in the entire circumferential direction of the shaft while enhancing the load bearing capacity in the specific radial direction.

[Means for Solving the Problems] The present invention provides a combined bearing device for a press machine provided with a cylindrical sliding bearing and a rolling bearing, wherein the inner diameter center of the sliding bearing and the inner diameter center of the rolling bearing are eccentrically arranged. It is characterized by having done.

[Operation] In the present invention, the rolling bearing regulates the movement amount of the shaft in the entire circumferential direction. On the other hand, since the sliding bearing is eccentric with the center of the inner diameter of the rolling bearing, the load bearing capacity in the specific radial direction can be increased and the radial movement amount in the entire circumferential direction can be restricted to a small value.

Therefore, for example, in the case of a crankshaft, if the center of the inner diameter of the slide bearing is eccentrically arranged so as to reduce the gap in the direction in which the press load is applied, it is only necessary to supply a small amount of low pressure lubricating oil in the direction of the press load. A large load bearing capacity can be obtained, and the amount of shaft movement that affects the die height can be kept to a minimum.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view and FIG. 2 is a front view.

In the figure, the bearing device 10 is provided as a device for rotatably supporting a crankshaft (1) of a press machine, and is composed of a slide bearing 11 and a pair of rolling bearings 21 and 21.

Here, the center of the shaft 1 (axis Z0) and each rolling bearing 21
It is concentric with the inner diameter center (axis Z2). However, the center of the inner diameter of the plain bearing 11 (axis Z1) is the center of the shaft (Z0).
On the other hand, it is eccentrically arranged by the eccentric amount e. That is, the inner diameter center (Z1) of the slide bearing 11 and the inner diameter center (Z2) of the rolling bearing 21 are eccentric.

Further, in the case of this embodiment, the eccentric direction of the slide bearing 11 is
Since the shaft 1 is the crankshaft, the method is eccentric in such a manner that the upper clearance C1 is reduced and the lower clearance C2 is increased as shown in FIG.

Therefore, the hydraulic pressure increasing portion 12 where the pressure of the lubricating oil OIL increases as the interval gradually narrows due to the whirling effect due to the rotation of the crankshaft 1 appears on the upper side of the plain bearing 11 as shown in FIG. That is, a sufficient load bearing capacity can be exerted against the large press load F shown in FIG. The larger the width dimension of the slide bearing 11, the further the promotion.

Moreover, even if such a large load bearing capability is provided, the radial movement amount of the rolling bearing 21 in the entire circumferential direction remains regulated, so that the upward movement amount of the crankshaft 1 is suppressed to a very small amount. it can. That is, the change in die height can be minimized regardless of the magnitude of the press load, and highly accurate press working can be performed.

According to this embodiment, however, the center of the inner diameter (Z1) of the slide bearing 11 and the center of the inner diameter (Z2) of the rolling bearing 21 are eccentric, so that the load bearing capacity can be increased and the circumferential direction can be increased. The radial movement amount of the shaft 1 can be minimized.

Further, since the eccentric direction of the plain bearing 11 can be arbitrarily selected, it has wide applicability and is effective as the bearing of the crankshaft 1 of the press machine in which the load is increased only in one direction as in this embodiment.

[Advantage of the Invention] According to the present invention, the combined bearing has an eccentricity between the inner diameter center of the slide bearing and the inner diameter center of the rolling bearing.
It is possible to minimize the radial movement amount in the entire circumferential direction of the shaft while improving the load bearing capacity.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a view for explaining a usage state in a press machine, and FIG. 4 is a conventional combined bearing. It is a sectional side view. 1 ... Crankshaft (shaft), 3 ... Slide, 10 ... Combined bearing, 11 ... Sliding bearing, 12 ... Hydraulic pressure rising part, 21 ... Rolling bearing, Z1 ... Shaft center, Z2 ... Sliding Bearing axis (center of inner diameter), Z3 ... Rolling bearing axis (center of inner diameter), C1, C2 ... Gap, e ... Eccentricity.

Claims (1)

[Scope of utility model registration request] 1. A combined bearing device for a press machine provided with a cylindrical slide bearing and a roller bearing, wherein the center of the inner diameter of the slide bearing and the center of the inner diameter of the rolling bearing are eccentrically arranged. Combined bearing device.