JPH0968219A - Bearing support mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing support mechanism of a large amount of absorption of eccentricity, which can correspond to eccentricity even if the amount by which housings are off-center to each other is greater than in conventional cases. SOLUTION: This bearing support mechanism has, in a bearing support 1 supporting a shaft 6 or the like via a bearing 4, and on the inner peripheral surface of a circular housing 2, an elastic material 3 approximately in the form of a timing belt whose outer peripheral surface is formed of numerous projections and recesses, with the bearing 4 placed on the inner peripheral surface of the elastic material 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing support mechanism for supporting shafts of various devices.

[0002]

2. Description of the Related Art In general, a bearing support portion of a bearing support for supporting a shaft is provided with a circular housing 2 as shown in FIG. Various bearings 4 such as a ball bearing, a cylindrical roller bearing, a needle bearing, and a sleeve metal are inserted in the inner peripheral surface of the housing 2.
The shaft is mounted so that the shaft can move freely, and a bearing support mechanism is configured.

When the bearing support 1 is fastened to the base or the frame with a screw or the like, there is a backlash in the mounting hole or a deviation in the housing 2, resulting in poor processing accuracy.
In many cases, the two housings 2 are not on the same core, and thus the two housings 2 are used without being centered, or are used by performing centering over time.

[0004] When used in a state where they are not on the same core, the following problems occur in each part. (1) The bearing is overloaded and the life of the bearing is shortened. (2) The shaft is overloaded to accelerate the wear of the shaft. (3) The entire device vibrates in order to operate in a state where processing and assembling accuracy is poor. (4) The backlash increases due to wear of the bearing,
The accuracy of the device is reduced. As a result, the life may be shortened.

As one of the measures for improving the above, as shown in FIGS. 9 and 10, a cylindrical elastic body 7 as shown in FIG. 8 is formed on the inner peripheral surface of the circular housing 2 by molding a substantially cylindrical rubber member. The above-mentioned elastic body is mounted, and further, a bearing and a shaft are mounted on the inner peripheral surface of the elastic body.

[0006]

Thus, by interposing the rubber material between the housing and the bearing, the eccentricity between the housings can be absorbed to some extent, and the problems (1) to (4) are improved to some extent. Has been done.

However, since the outer circumference of the elastic body is in contact with the housing over the entire circumference, the surface pressure of the contact surface with the elastic body is low and the elastic body is less likely to be deformed. Therefore, it is possible to cope with a larger eccentricity. There was a problem that I could not.

The present invention has been made in view of such circumstances, and an overload is formed by reducing the contact area with the housing by making the outer shape of the elastic body into a large number of irregularities in the shape of a substantially timing belt. Since the surface pressure of the contact surface is increased due to, and a part of the convex portion of the deformed elastic body can move into the space of the concave portion of the elastic body, the elastic body is easily deformed.

By doing so, it becomes possible to deal with the eccentricity even if the center deviation between the housings is larger than in the conventional case. An object of the present invention is to provide a bearing support mechanism having such a large eccentric absorption amount.

[0010]

A bearing support is provided with a circular housing, and an inner peripheral surface of the housing is provided with a substantially timing belt-shaped elastic body having an outer peripheral surface formed with a large number of irregularities. By providing the bearing on the inner peripheral surface of the elastic body, the contact area between the housing and the elastic body is reduced.

Therefore, when an overload is applied, the surface pressure of the contact convex portion of the elastic body rises and the elastic member is easily deformed. Since a part of the deformed convex portion of the elastic body moves into the space of the concave portion of the elastic body, the convex portion is easily deformed. By using one or more such bearing support mechanisms for various mechanisms, the amount of eccentricity absorption becomes large and the problem is solved without overloading each bearing part.

[0012]

With the rotation of the shaft, a force is applied to the elastic body inscribed in the housing through the bearing, and the convex portion of the elastic body is deformed by this force. When a larger force is applied to the elastic body, a part of the deformed convex portion of the elastic body moves to a space which is a concave portion of the elastic body, so that the convex portion is further deformed.

Due to the deformation of the elastic body, the shaft center moves, and the center deviation between the housings is corrected without overloading the bearing portion, and eccentricity can be dealt with.

By using one or a plurality of such bearing supports to form various motion mechanisms such as a linear motion mechanism, the deformation of the convex portion of the elastic body even if the shaft is overloaded or eccentrically loaded. Since part of the eccentricity can be absorbed by the concave portion of the elastic body, the eccentricity absorption amount increases and eccentricity can be accommodated.

The functions of the rotary motion mechanism, the roller or gear mechanism, and the linear motion mechanism will be described in the following embodiments.

[0016]

1 is a front view of an elastic body according to an embodiment of the present invention inserted in a housing, and FIG. 2 is a front view of the present invention. FIG. 4 is a cross-sectional view of an elastic body according to an exemplary embodiment inserted in a housing, FIG. 3 is a perspective view of the elastic body according to an exemplary embodiment of the present invention, and FIG. FIG. 5 is a front view, FIG. 5 is a sectional view of a rotary motion mechanism according to an embodiment of the present invention, FIG. 6 is a perspective view of a roller or gear mechanism according to another embodiment of the present invention, and FIG. FIG. 6 is a perspective view of a linear movement mechanism according to a third embodiment of FIG.

In FIGS. 1, 2, and 4, the bearing support 1
A circular housing 2 is formed at an arbitrary position.
A substantially timing belt-shaped elastic body 3 having an outer peripheral surface formed with a large number of concavities and convexities is mounted on the housing 2, and a ball bearing, a cylindrical roller bearing, a needle bearing, a sleeve metal, etc. are mounted on the inner peripheral surface of the elastic body 3. Various bearings 4 are inserted to form a bearing holding portion.

FIG. 3 shows an example of the shape of the elastic body of the present invention. This elastic body has a substantially timing belt shape, but as shown in the drawing, a large number of irregularities are provided on the outer periphery of the elastic body.

FIG. 5 shows an embodiment of a rotary motion mechanism using the substantially timing belt-shaped elastic bodies 3a and 3b of the present invention.
The electric motor 5 is attached to the base 14 with bolts 13. The shaft 6 is supported by the housing 2 formed on the brackets 15a and 15b via bearings 4a and 4c and a substantially timing belt-shaped elastic body 3a. Further, the tip of the shaft is supported by the housing 2 via a B bearing 4b and a substantially timing belt-shaped elastic body 3b.

The substantially timing belt-shaped elastic bodies 3a and 3b provided at two locations may be provided only at any one location. A load 11 is provided on the shaft 6. The shape of the load 11 may be an unbalanced shape, and various types are possible.

FIG. 6 shows an embodiment of a roller or gear mechanism 16 using the substantially belt-shaped elastic bodies 3d, 3e, 3f, 3g of the present invention. In this figure, 17 and 18 are rollers or gears, and these rollers or gears are bearings 4d, 4 and
e, 4f, 4g and the elastic bodies 3d, 3e, 3 outside thereof
It is held in each of the housings 2 at four places via f and 3g. Reference numeral 19 is a drive shaft and 20 is a transmission shaft.

FIG. 7 shows an embodiment of the linear movement mechanism 25 using the substantially timing belt-shaped elastic bodies 3h and 3i of the present invention.

The substantially timing belt-shaped elastic bodies 3h and 3i are housings 2h and 2 provided on the bearing supports 1d and 1e.
It is attached to i.

The bearing supports 1d and 1e are frame 29
They are arranged on both sides in the longitudinal direction and are fastened to the frame 29 with screws or the like.

The ball screw 26 has bearings 4h and 4i.
And the housings 2h, 2i via the elastic bodies 3h, 3i
The slider 27 is screwed onto the ball screw 26. In addition, this slider 27
A sliding portion 32 is provided on the linear guide 30, and the sliding portion 32 and the linear guide 30 are in contact with each other. The linear guide 30 is fastened to the frame 29. Further, one end of the ball screw 26 is connected to the motor 2 via the coupling 31.
8.

In the structure as shown in FIGS. 1 to 4, as the shaft rotates, a force is applied to the substantially timing belt-shaped elastic body inscribed in the housing via the bearing. Due to this force, of the many convex portions provided on the elastic body, the convex portion receiving the force is deformed.

When a larger force is applied to the elastic body, a part of the deformation of the convex portion moves to the space which is the concave portion of the elastic body, so that the deformation of the convex portion becomes larger.

Due to the deformation of the elastic body, the shaft center is moved, the center deviation between the housings is corrected without overloading the bearing portion, and the eccentricity can be dealt with.

By thus forming the elastic body 3 in the shape of a substantially timing belt, a part of the deformation of the elastic body can be absorbed in the concave portion of the elastic body, so that the eccentric absorption amount increases.

By constructing a linear motion mechanism or the like by using one or a plurality of such bearing supports 1, the elastic body 3 absorbs a force such as an eccentric load even when the shaft is overloaded. Therefore, eccentricity can be accommodated even if the center of the bearing deviates.

In the structure as shown in FIG. 5, when the switch of the electric motor 5 is turned on, a rotating magnetic field is generated in the stator 9 and the rotor 8 and the shaft 6 rotate. Then, due to the rotation of the shaft 6, the load 11 fixed to the shaft 6 also rotates at the same time. Due to the rotation of this load, a circumferential force is mainly applied to the B bearing 4b and the A bearing 4a. Particularly when the load 11 has a large unbalance, a larger force is applied to the bearing and the elastic body.

Due to this force, a part of the convex portion formed on the substantially timing belt-shaped elastic bodies 3a, 3b moves to a space which is a concave portion of the elastic body, so that the convex portion is deformed.

Due to the deformation of the elastic body, the shaft center moves, and the center deviation between the housings is corrected without overloading the bearing portion, and eccentricity can be dealt with.

Therefore, the amount of eccentric absorption of the elastic body 3 increases, and it becomes possible to cope with a large deviation of the center of the bearing.

Also, by using such an elastic body, an unreasonable force is not applied to the bearing and the housing even if the load is unbalanced.

A rotary motion mechanism 10 is provided with an elastic body having such a shape.
When used for the bearing, the bearing is not overloaded, and since it also acts as an earthquake proof, its effect is great.

In the structure shown in FIG. 6, the drive shaft 19 is rotated by the rotation of the drive source. And by this rotation,
The A roller or A gear 17 supported by the D bearing 4d and the E bearing 4e rotates. Further, due to the rotation of the roller or gear 17, the B roller or B gear 18, which is in abutment or meshing with the roller or gear 17, is rotated. In addition, this code 17.1
When 8 is a gear, this rotation is further transmitted to the transmission shaft 20.

By rotating the two A rollers and the B roller or the A gear and the B gear while abutting or meshing with each other,
A force is applied to the bearings 4d, 4e, 4f, and 4g at the four locations in the direction in which the rollers or gears separate.

By this force, a part of the convex portion formed on the substantially timing belt-shaped elastic bodies 3d, 3e, 3f, 3g moves to the space which is the concave portion of the elastic body, and the convex portion is deformed.

Due to the deformation of the elastic body, the shaft center is moved, and it is possible to deal with eccentricity without overloading the bearing portion.

Further, when the reference numerals 17 and 18 are gears, 2
Since the meshing force between the two gears is weakened, the gear noise is reduced.

In the structure shown in FIG. 7, when the motor 28 rotates, this rotation is transmitted to the ball screw 26 via the coupling 31. The ball screw is supported by bearings 4h and 4i. By the rotation of the ball screw 26, the slider 27 screwed with the ball screw 26 is linearly moved while being regulated by the linear guide 30. When the slider 27 moves linearly in the central portion of the frame 29, it moves relatively smoothly,
As it moves to both ends, the slider 27, the linear guide 30, the ball screw 26, the bearing 4 and the like regulate each other, and each part is overloaded. In particular, if the processing accuracy of the slider 27, the linear guide 30, the ball screw 26, the housing 2, etc. is poor, a high load is applied.

However, even when the bearings 4h and 4i are overloaded by using the substantially timing belt-like elastic body for the bearing portion, a part of the convex portions of the elastic bodies 3h and 3i are concave portions of the elastic body. Since it moves to a certain space, the convex portion is deformed.

The shaft core of the ball screw moves due to the deformation of the elastic body. Due to this movement, regulations of each part are relaxed,
The slider 27 moves smoothly to the end.
As a result, the bearings 4h and 4i, the slider and the linear guide are not overloaded, and the wear of each part is reduced, so that the life of the device is extended.

As a method for manufacturing the substantially timing belt-shaped elastic body, various molding methods such as rubber molding, resin molding and the like can be considered depending on the material used.

Although rubber-based materials are generally used as the material of the elastic body, resins and two or more kinds of synthetic materials are also conceivable.

[0047]

As described above, a substantially timing belt-shaped elastic body having an outer peripheral surface formed with a large number of irregularities is arranged in a circular housing as in the present invention, and a bearing is provided on the inner peripheral surface of the elastic body. By including the above, the elastic body can be easily deformed when eccentricity between the housings or an overload is applied to the shaft. In other words, the amount of eccentricity absorption is larger than in the past, and this makes it possible to deal with the case where the center of the bearing deviates more than ever or the shaft is overloaded. As an effect of arranging a substantially timing belt-like elastic body on the inner circumference of the housing, (1) the bearing is not overloaded and the life of the bearing is extended. (2) The shaft is not overloaded and the shaft is less likely to wear. . (3) Installation and adjustment time is shortened. (4) Vibration of the entire device is reduced without operating in an unreasonable state. (5) The wear of the bearing portion is small and the accuracy of the equipment can be maintained. Or the life of the device is extended. There are many improvements, etc., and the effect is great.

[0048]

[Brief description of drawings]

FIG. 1 is a front view of an elastic body according to an embodiment of the present invention inserted into a housing.

FIG. 2 is a cross-sectional view in which an elastic body according to an embodiment of the present invention is inserted into a housing.

FIG. 3 is a perspective view of an elastic body according to an embodiment of the present invention.

FIG. 4 is a front view of an elastic body according to an exemplary embodiment of the present invention in a deformed state.

FIG. 5 is a sectional view of a rotary motion mechanism according to an embodiment of the present invention.

FIG. 6 is a perspective view of a roller or gear mechanism according to another embodiment of the present invention.

FIG. 7 is a perspective view of a linear movement mechanism according to a third embodiment of the present invention.

FIG. 8 is a perspective view of a conventional elastic body.

FIG. 9 is a front view of a conventional elastic body inserted into a housing.

FIG. 10 is a sectional view of a conventional elastic body portion.

[Explanation of symbols]

 1 ... Bearing support 2 ... Housing 3 ... Substantially timing belt-like elastic body 4 ... Bearing 5 ... Electric motor 6 ... Shaft 10・ ・ ・ ・ ・ Rotary motion mechanism 16 ・ ・ ・ ・ ・ Roller or gear mechanism 17 ・ ・ ・ ・ ・ A roller or A gear 18 ・ ・ ・ B roller or B gear 19 ・ ・ ・ ・ ・ Drive shaft 25 ・.... Linear motion mechanism 26 ... Ball screw 27 ... Slider

Claims (1)

[Claims] 1. A bearing support is provided with a circular housing, and an inner peripheral surface of the housing is provided with a substantially timing belt-shaped elastic body having an outer peripheral surface formed with a large number of concavities and convexities. A bearing support mechanism comprising a bearing on a circumferential surface.