JPH05231424A - Bearing mechanism for fine turning angle - Google Patents

Abstract

PURPOSE:To eliminate the partial abrasion of a rotating body in a bearing for the lever fulcrum support of a cam drive mechanism having a fine angle of rotation. CONSTITUTION:A plurality of inner rotating bodies 2 annularly arranged in an approximately cylindrical housing 1 in such a way as contacting the external surface of a supported turning shaft 4, are so retained as to be freely rotatable. Also, a cylindrical ring 8 is annularly coupled in such a way as circumscribing the annularly laid bodies 2. Furthermore, a plurality of outer rotating bodies 3 so retained in the housing 1 as to be freely rotatable are annularly arranged in contact with the external surface of the ring 8. This ring 8 is caused to coaxially rotate with the supported turning shaft 4 with a drive means. For the mechanism of the drive means, a motor drive 9 with gear means 8b and 10, or one-way clutch may be used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for supporting a lever fulcrum of a rod which oscillates by a cam driving mechanism or the like, and particularly for a fulcrum bearing when a rotation angle (or an oscillating angle) is a minute angle. The present invention relates to a bearing mechanism for a minute turning angle.

[0002]

2. Description of the Related Art Various drive mechanisms of various mechanical devices use various cam mechanisms that perform desired operations based on the principle of leverage using a cam. In such a cam mechanism, as shown in the conventional example of FIG. 5, the fulcrum shaft 52 of the swing rod 51 that is operated by the cam 50 is generally supported by using a ball bearing, a roller bearing, or the like.

[0003]

By the way, in such a mechanism, the movement amount (arrow x) of the action point 53 of the swing rod 51 is small, and the rotation angle Θ of the fulcrum shaft 52 is a minute angle. Therefore, as shown in FIG. 6, the rotation angle α of the rotating body 54 such as a ball or a roller in the bearing also becomes a minute angle, and the contact surface 55 is limited to a minute range and only in that portion.
Repeated loads will be applied continuously.

Therefore, in such an operating condition, the contact surface 55 of the rotating body 54 is worn or damaged in a short period of time, and the service life of the bearing is significantly shorter than that in normal use. There was a problem that it would end up.
Therefore, the present invention is intended to solve such a problem, and it is possible to improve the service life of the bearing by rotating the rotating body and appropriately moving the contact surface 55 with the fulcrum shaft 52. A bearing mechanism for a turning angle is provided.

[0005]

In order to achieve the above-mentioned object, the bearing mechanism for a minute turning angle according to the present invention is constructed as follows. That is, in a substantially cylindrical housing that is fixed to the outside, a plurality of inner rotating bodies that are annularly arranged so as to contact the outer peripheral surface of the supported rotation shaft are rotatably held. Further, a cylindrical ring is mounted so as to circumscribe the inner rotating body arranged in an annular shape. On the outer periphery of the ring, a plurality of outer rotating bodies rotatably held in the housing are arranged in an annular shape in contact with the outer peripheral surface. Further, the ring is characterized by being rotated coaxially with the supported rotation shaft by a driving means.

Here, the mechanism of the driving means is such that a ring is extended to the outside of the housing in the direction of the rotation axis, a gear is formed on the outer peripheral surface or the inner peripheral surface of the ring, and the gear means meshing with the ring drives the motor. Alternatively, a drive mechanism may be provided in which the ring is extended to the outside of the housing, and the extended portion and the tip end of the supported rotation shaft are connected by a one-way clutch mounted on the supported rotation shaft. May be

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, two specific embodiments of the minute rotation angle bearing mechanism according to the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway vertical sectional view showing the first embodiment, and FIG. 2 is a partially cutaway vertical sectional view taken along the line AA of FIG.

The housing 1 is formed in a substantially cylindrical shape, forms an outer shell of a bearing, and is fixed to the outside. Housing 1
Inside, a plurality of inner rotating bodies 2, 2, 2, ...
And the outer rotating bodies 3, 3, 3, ... A plurality of inner rotating bodies 2 are annularly arranged on the outer peripheral surface 5 of the supported rotating shaft 4 serving as a fulcrum shaft of the lever mechanism via the mounting ring 6, and are rotatably provided in the housing 1 by the holding body 7. Is held. Outer part 2a of inner rotating body 2
Is arranged so as to be exposed from the holding body 7, and a cylindrical ring 8 is mounted so as to abut the outer portion 2a and surround the inner rotating body 2.

The ring 8 is a housing 1 in the direction of the rotation axis.
Is formed with an extended portion 8a protruding outward, and a gear 8b is formed on the outer peripheral surface of the end portion thereof. This gear 8b
Is a pinion gear 1 connected to a driving means such as a motor 9.
It meshes with 0. Although the gear 8b is engraved on the outer peripheral surface of the end portion of the ring 8 in the embodiment, the gear 8b is not limited to this and may be engraved on the inner peripheral surface of the end portion.

A plurality of outer rotating bodies 3 are arranged so as to surround the outer periphery of the ring 8 and abut on the outer peripheral surface 8c, and are rotatably held in the housing 1 by a holding body 11. .. Here, the supported rotating shaft 4 has its tip 4a penetrating the mounting ring 6 and
It is attached and fixed integrally with the attachment ring 6 by fastening 2.

Next, a second embodiment will be described with reference to FIG. 3 showing a partially cut longitudinal section thereof. The configurations of the housing 1, the inner rotary body 2, and the outer rotary body 3 are the same as those in the first embodiment, and therefore the same reference numerals are given and the description thereof will be omitted. Second
The embodiment is different from the first embodiment in that the ring 13 is driven by using the turning force of the supported rotation shaft 4 without using the motor drive mechanisms 8a, 9, 10.

That is, a diameter-increasing concave portion 13b is formed inside the tip portion of the extending portion 13a of the ring 13, and the diameter-increasing concave portion 13b is annularly mounted on the tip portion 4a of the supported rotating shaft 4. The fixed one-way clutch 14 is fitted with the fixed ring 15
It is fixed by fastening. As a result, the tip portion 4a of the supported rotation shaft 4 and the extended portion 13a of the ring 13 are connected, and the rotational force in only one direction (clutch operating direction) is transmitted to the ring 13.

Although balls are used as the rotating bodies 2 and 3 in the embodiment, similar effects can be expected even if they are rollers or rollers.

[0014]

With the above construction, the present invention operates as follows. FIG. 4 is an operational diagram showing the operational status of each component. When the supported rotation shaft 4 rotates (or swings) at a minute angle (arrow a), the inner rotating body 2 in contact therewith also rotates by a minute angle (arrow b). At this time, in the case of the first embodiment, the ring 8 is constantly rotated by the linkage with the motor 9, the pinion gear 10, and the gear 8b (arrow c). In the case of the second embodiment, the ring 13 is sequentially rotated in a fixed direction (direction in which the clutch operates) by the driving force of the supported rotation shaft 4 via the one-way clutch 14. Due to the rotation of the rings 8 and 14, the inner rotating body 2 and the outer rotating body 3 that are in contact with the rings 8 and 14 rotate in the directions of arrows d and e, respectively.

[0015]

[Effects] With the above-described structure, the inner rotating body that rotatably supports the supported rotating shaft rotates by the contact of the ring, so that the contact surface of the inner rotating body always moves.
Therefore, even if the micro-angle rotation continues to operate, the part to which the repeated load is applied will not always move in one place, but it will avoid uneven wear or damage of the inner rotating body and dramatically improve durability. Has the effect of

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical sectional view showing a first embodiment.

FIG. 2 is a partially cutaway vertical sectional view taken along line AA of FIG.

FIG. 3 is a partially cutaway vertical sectional view showing a second embodiment.

FIG. 4 is an operation diagram showing an operation status of each component.

FIG. 5 is a schematic view showing a conventional example.

FIG. 6 is an enlarged view of a main part of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing 2 ... Inner rotating body 3 ... Outer rotating body 4 ... Supported rotating shaft 4a ... Tip part (of supported rotating shaft) 8 ... Ring 8a. (Extended part of ring) 8b ... Gear 8c ... outer peripheral surface 9 ... motor 10 ... pinion gear 13 ... ring 13a ... extended part (of ring) 14 ... one-way clutch

Claims (3)

[Claims] 1. A substantially cylindrical housing (1) fixed to the outside, and an annular arrangement arranged so as to come into contact with an outer peripheral surface (5) of a supported rotation shaft (4), and rotating on the housing (1). A plurality of inner rotating bodies (2) held freely, a cylindrical ring (8) mounted so as to circumscribe the inner rotating body (2), and an outer peripheral surface of the rings (8). A plurality of outer rotating bodies (3), which are arranged annularly in contact with (8c) and are rotatably held in the housing (1); and a rotating shaft (4) to which the ring (8) is supported. A minute rotation angle bearing mechanism comprising: a driving unit that rotates coaxially. 2. In the drive means, the ring (8) is extended to the outside of the housing (1) in the direction of the rotation axis, and its outer peripheral surface,
2. The bearing mechanism for a minute turning angle according to claim 1, wherein the motor (9) is driven through a gear means (10) meshing with a gear (8b) formed on the inner peripheral surface. 3. The drive means, wherein a ring (13) is extended to the outside of the housing (1) in the direction of the rotation axis, and a one-way clutch (14) mounted around the supported rotation axis (4) is used, The bearing mechanism for a minute turning angle according to claim 1, wherein the extended portion (13a) and the tip end portion (4a) of the supported turning shaft (4) are connected.