Positive and reverse fine rotation elastic bearing

Abstract

To provide a forward / reverse fine rotation elastic bearing in which noise and vibration are extremely small during operation and maintenance is unnecessary, and which can simplify a structure and reduce the size and weight relatively easily.SOLUTION: A forward / reverse fine rotation elastic bearing 50 comprises a pair of support members 51, 52 arranged around a shaft body 1 that finely rotates in forward and reverse directions, and plate-shaped elastic members 53, 54 of which base end parts 53b, 54b respectively are locked to the support members 51, 52, and tip parts 53a, 54a are locked to the outer periphery of the shaft body 1, where the base end part 53b (54b) side and the tip end part 53a (54a) side of each of the plate-shaped elastic members 53, 54 having curved parts 53c, 54c are locked at positions facing each other with the shaft body 1 interposed therebetween.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a forward / reverse fine rotation elastic bearing that has both a function of supporting a shaft that repeatedly rotates in forward and reverse directions at a small angle and a function of returning the shaft to a fixed position by the restoring force of an elastic member. [Background technology]

[0002] Because general bearings are structured to support a shaft that rotates in a fixed direction, they are not suitable for use in parts that support a shaft that repeats forward and reverse fine rotations at small angles, and do not have the function of a spring to return the shaft to a fixed position. However, mechanisms for supporting a shaft that rotates forward and reverse finely and spring mechanisms are necessary in various mechanical devices, so conventionally, bearings that use rolling elements (see, for example, Patent Documents 1 and 2) or bearings that use coil springs (see, for example, Patent Document 3) have been used.

[0003] The "rocking bearing" described in Patent Document 1 has a raceway ring whose outer diameter surface is formed in an arc shape and whose inner diameter surface is provided with a concave arc-shaped raceway surface, and a number of rollers that are arranged and roll on the raceway surface of the raceway ring, with the outer diameter surface of the raceway ring abutting and fixed to the concave arc-shaped portion of the housing, and the plurality of rollers supporting the convex arc-shaped portion of the movable member so that it can rock freely, and a buffer means is provided on the outer diameter surface of the raceway ring to provide a buffering effect between the concave arc-shaped portion of the housing with which the outer diameter surface abuts.

[0004] The "forward and reverse fine rotation rolling bearing" described in Patent Document 2 is a rolling bearing in which grease is sealed in a bearing space in which rolling elements are arranged between the raceway surfaces of the inner and outer rings, and which supports a shaft that rotates forward and reverse finely. In this rolling bearing, the rolling elements are made of ceramic, a carbonitrided layer is formed on the raceway surfaces of the inner and outer rings, and a urea compound is used as a grease thickener.

[0005] The "elastic fulcrum bearing" described in Patent Document 3 is constructed by pressing a shaft body, with a coil spring wound around a serration portion provided on the outer periphery, into a shaft hole that has a serration portion provided on the inner periphery. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2008-64267 A [Patent Document 2] JP 2006-316850 A [Patent Document 3] Japanese Patent Application Laid-Open No. 60-136633 Summary of the Invention [Problem to be solved by the invention]

[0007] The "rocking bearing" described in Patent Document 1 and the "rolling bearing for forward and reverse fine rotation" described in Patent Document 2 have a complex structure, generate a large amount of noise during operation, and require lubricants such as grease. In addition, when the bearings described in Patent Documents 1 and 2 are used in forward and reverse fine rotation parts, the multiple rolling elements equipped in each bearing repeatedly roll within a limited, minute range, causing the oil film of grease or other lubricants to break and cause solid contact, resulting in localized wear, which reduces the bearing's function and reduces durability. In particular, when the rolling elements are used under a heavy load or when the bearings are used on a shaft that rotates forward and reverse finely at high speed, the aforementioned localized wear is likely to occur. In addition, the bearings described in Patent Documents 1 and 2 do not have a spring function to return the shaft to its fixed position.

[0008] Furthermore, when the "elastic fulcrum bearing" described in Patent Document 3 is used in a forward / reverse fine rotation part, minute sliding motion is repeated at the contact points between the coil spring and the shaft serration portion and the shaft hole serration portion, making it impossible to avoid the generation of noise and fretting wear.

[0009] Therefore, the problem that the present invention aims to solve is to provide a forward / reverse fine-motion rotation elastic bearing that produces extremely little noise and vibration during operation, requires no maintenance, and can be made relatively easily compact and lightweight as well as having a simplified structure. [Means for solving the problem]

[0010] The forward / reverse fine rotation elastic bearing according to the present invention has: A support member disposed around a shaft body that rotates slightly in forward and reverse directions; a plurality of elastic members each having a base end portion engaged with the support member and a tip end portion engaged with an outer periphery of the shaft body, When a torsional moment is applied to the shaft, the elastic member rotates relative to the axis of the shaft. Each is rotationally symmetric The elastic member is characterized in that the base end and the tip end are engaged at a position where the elastic member can be deformed.

[0014] In the forward / reverse fine rotation elastic bearing, the elastic members are desirably plate-like elastic members having curved portions that are curved so as to surround a semi-circumferential region around the shaft body.

[0015] In the forward / reverse fine rotation elastic bearing, the plate-shaped elastic member may have a portion where the plate thickness of the plate-shaped elastic member decreases from the base end toward the tip end. Effect of the Invention

[0018] The present invention makes it possible to provide a forward / reverse fine-motion elastic rotation bearing that produces extremely little noise and vibration during operation, requires no maintenance, and allows for relatively easy structural simplification and reduction in size and weight. [Brief description of the drawings]

[0019] [Figure 1] 1 is a partially omitted perspective view showing a forward / reverse fine-motion elastic rotation bearing according to an embodiment of the present invention. [Diagram 2] 2 is a partially omitted front view of the forward / reverse fine rotation elastic bearing as seen from the direction of the arrow A in FIG. 1. [Diagram 3] 2 is a partially omitted side view of the forward / reverse fine rotation elastic bearing as seen from the direction of the arrow B in FIG. 1. [Figure 4] 2 is a partially omitted plan view of the forward / reverse fine-motion rotation elastic bearing as seen from the direction of the arrow C in FIG. [Diagram 5] FIG. 2 is a partially omitted perspective view of a repeating moment generating device using the forward / reverse fine rotation elastic bearing shown in FIG. [Figure 6] FIG. 6 is a partial enlarged view of the repeating moment generating device shown in FIG. 5. [Figure 7] FIG. 11 is a partially omitted perspective view showing a forward / reverse fine-motion rotation elastic bearing according to another embodiment of the present invention. [Figure 8] 8 is a partially omitted front view of the forward / reverse fine rotation elastic bearing shown in FIG. 7. [Figure 9] FIG. 11 is a partially omitted perspective view showing a forward / reverse fine-motion rotation elastic bearing according to another embodiment of the present invention. [Figure 10] 10 is a partially omitted front view of the forward / reverse fine rotation elastic bearing shown in FIG. 9. [Figure 11] FIG. 11 is a partially omitted perspective view showing a forward / reverse fine-motion rotation elastic bearing according to another embodiment of the present invention. [Figure 12] 12 is a partially omitted front view of the forward / reverse fine rotation elastic bearing shown in FIG. 11. [Figure 13] FIG. 11 is a partially omitted perspective view showing a forward / reverse fine-motion rotation elastic bearing according to another embodiment of the present invention. [Figure 14] 14 is a partially omitted front view of the fine-motion rotation elastic bearing shown in FIG. 13. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Below, based on Figures 1 to 6, we will explain forward and reverse fine movement rotation elastic bearing 50, which is an embodiment of the present invention, and repeating moment generating device 100 using forward and reverse fine movement rotation elastic bearing 50, and based on Figures 7 to 14, we will explain forward and reverse fine movement rotation elastic bearings 60, 70, 80, and 90, which are other embodiments of the present invention.

[0021] First, the structure and function of the forward / reverse fine rotation elastic bearing 50 will be described with reference to Figures 1 to 4. As shown in Figures 1 to 4, the forward / reverse fine rotation elastic bearing 50 includes support members 51, 52 arranged around the shaft body 1 which finely rotates in forward and reverse directions, and a plurality of elastic members 53, 54 whose base ends 53b, 54b are engaged with the support members 51, 52, respectively, and whose tip ends 53a, 54a are engaged with the outer periphery of the shaft body 1, and the base end 53b (54b) side and the tip end 53a (54a) side of each of the elastic members 53, 54 are engaged at positions facing each other with the shaft body 1 in between.

[0022] The elastic members 53, 54 are plate-shaped elastic members of the same shape and size. The base end 53b (54b) side and the tip end 53a (54a) side of each of the elastic members 53, 54 are arranged such that when a torsional moment is applied to the shaft body 1, the elastic members 53, 54 rotate relative to the axis 1c of the shaft body 1. Rotational Symmetry The movable member is locked in a deformable position.

[0023] The support members 51, 52 are integrally provided on a block body 55, and as shown in Fig. 2, the support members 51, 52 and the block body 55 have a concave shape when viewed from the front. As shown in Fig. 2, the support members 51, 52 have mirror symmetrical portions sandwiching the shaft body 1. When a torsional moment is applied to the shaft body 1, the elastic members 53, 54 of the support members 51, 52 rotate relative to the axis 1c of the shaft body 1. Rotational Symmetry The actuator is disposed in a position where it can be deformed.

[0024] As described above, the elastic members 53, 54 are plate-shaped elastic members of the same shape and dimensions, and have curved portions 53c, 54c that are curved so as to surround a semi-circumferential region around the shaft body 1. The plate thicknesses 53t, 54t of the plate-shaped elastic members 53, 53 continuously decrease from the base ends 53b, 54b of the plate-shaped elastic members 53, 54 toward the tip ends 53a, 54a, respectively.

[0025] The base end 53b of the plate-shaped elastic member 53 is fixed to the support member 51 by a bolt 57b that passes through the support member 51 and the base end 53b from the left side surface 51s of the support member 51 toward the shaft body 1 and a nut 57n that is screwed onto the bolt 57b. Similarly, the base end 54b of the plate-shaped elastic member 54 is fixed to the support member 52 by a bolt 58b that passes through the support member 52 and the base end 54b from the right side surface 52s of the support member 52 toward the shaft body 1 and a nut 58n that is screwed onto the bolt 58b.

[0026] A tip end 53a of the plate-shaped elastic member 53 is fixed to the outer circumferential surface of the shaft body 1 by a bolt 59, and a tip end 54a of the plate-shaped elastic member 54 is fixed to the outer circumferential surface of the shaft body 1 by a bolt 56. As shown in Figures 1 and 2, a base end 53b and a tip end 53a of one plate-shaped elastic member 53 and a base end 54b and a tip end 54a of the other plate-shaped elastic member 54 are arranged in series on an imaginary straight line L that is perpendicular to the axis 1c of the shaft body 1.

[0027] In the forward and reverse fine-rotation elastic bearing 50, the shaft body 1 is supported by a pair of plate-shaped elastic members 53, 54 arranged opposite each other on either side of the shaft body 1. This not only makes it possible to stably support the shaft body 1, which rotates forward and reverse finely, in a fixed position, but also makes it possible to impart to the shaft body 1 a rotation angle proportional to the magnitude of the torsional moment loaded on the shaft body 1, and to impart a restoring force that returns the shaft body 1 to a fixed position where the rotation angle is zero, against the torsional moment.

[0028] In addition, in the forward / reverse fine-motion rotation elastic bearing 50 which supports the shaft 1 which rotates in a forward / reverse fine-motion manner, there are no parts which come into contact with or separate from each other or slide over minute areas, so noise and vibration during operation are extremely small and maintenance is unnecessary. Furthermore, since the forward / reverse fine-motion rotation elastic bearing 50 has a small number of constituent parts, it is possible to relatively easily simplify the structure and make it smaller and lighter.

[0029] Next, a repeating moment generating device 100 using the forward / reverse fine rotation elastic bearing 50 shown in Figures 1 to 4 will be described with reference to Figures 5 and 6. Note that in Figures 5 and 6, some of the components (such as the table 24 and the support legs 25) are shown as transparent to improve visibility.

[0030] As shown in Figures 5 and 6, the repetitive moment generating device 100 can be used in a fatigue testing machine (not shown) that tests fatigue strength characteristics by applying a repetitive moment to a test piece. In the repetitive moment generating device 100, in order to hold the shaft body 1 that transmits the repetitive moment to the test piece (not shown) set in the fatigue testing machine so that it can rotate in both directions, forward and reverse fine movement elastic bearings 50, 50 are arranged near both ends of the shaft body 1. The forward and reverse fine movement elastic bearings 50, 50 are arranged on the upper surface of the table 24 at a predetermined distance in the direction of the axis 1c of the shaft body 1.

[0031] In the region between the forward and reverse fine-motion rotation elastic bearings 50, 50, a pair of lever members 3a, 3b are attached to the shaft body 1 at positions spaced apart in the direction of the axis 1c of the shaft body 1, each perpendicular to the shaft body 1, and in the region where the lever members 3a, 3b face each other, shafts 4, 5 that can freely rotate around axes 4c, 5c parallel to the shaft body 1 are provided at positions symmetrical about the shaft body 1, and eccentric weight rotors 6, 7 that rotate together with the shaft bodies 4, 5 around the axes 4c, 5c are provided on parts of the shafts 4, 5.

[0032] As shown in Figure 6, the eccentric weight rotors 6, 7 include enlarged diameter sections 6b, 7b provided on parts of the shafts 4, 5, respectively, and eccentric weight members 6c, 7c inserted into through-holes 6h, 7h opened in the enlarged diameter sections 6b, 7b in a direction perpendicular to the axes 4c, 5c and in a state perpendicular to the shafts 4, 5 and movable along the direction perpendicular to the shafts 4, 5.

[0033] The weight members 6c, 7c include bolt members 6e, 7e screwed through the enlarged diameter portions 6b, 7b, weights 6g, 7g provided at one end of the bolt members 6e, 7e, and lock nuts 6d, 7d screwed onto the bolt members 6e, 7e to lock the bolt members 6e, 7e to the enlarged diameter portions 6b, 7b. A male thread is formed on the outer periphery of the bolt members 6e, 7e, and a short cylindrical stopper portion 6f, 7f with a larger diameter than the male thread portion is provided at the other end of the weight members 6c, 7c. Also, a motor 14 is provided as a driving means for rotating the shaft bodies 4, 5 in synchronization with each other.

[0034] The bolt members 6e, 7e having male threads on their outer periphery are screwed into the enlarged diameter portions 6b, 7b having female threaded holes 6h, 7h, and by rotating the bolt members 6e, 7e around their axes and moving them longitudinally to change the distance between the weights 6g, 7g and the axes 4c, 5c of the shafts 4, 5, the position of the center of gravity (not shown) of the weight members 6c, 7c can be changed in a direction away from or towards the axes 4c, 5c.

[0035] As shown in Fig. 5, table 24 is a rectangular flat member, and is kept horizontal by four support legs 25 arranged on the underside of its four corners 24c. Support legs 25 have an L-shaped horizontal cross section, and a bottom plate 25b is provided on the underside. Four corners 24c of table 24 are respectively placed and fixed on top surfaces 25a of four support legs 25, and rectangular flat under-table 26 is arranged on the bottom plates 25b located at four locations.

[0036] On an under-table 26 below the table 24, there are provided a motor 14, medium timing pulleys 15, 16, a large timing pulley 18, small timing pulleys 19a, 19b, and timing belts 21, 22 as driving means for synchronously rotating the two eccentric weight rotors 6, 7. When the motor 14 is operated, its rotational force is output to the rotating shaft 14a via a gear box 17.

[0037] A middle timing pulley 15 is attached to the rotating shaft 14a rotated by the motor 14, and a middle timing pulley 16 and a large timing pulley 18 are rotatably attached to the shaft body 1 via bearings. The rotating shaft 14a is parallel to the shaft body 1, and the middle timing pulley 15 on the motor 14 side is located directly below the middle timing pulley 16 on the shaft body 1 side, with the middle timing pulleys 15, 16 facing each other and vertically in series.

[0038] Small timing pulleys 19a, 19b are attached to the shafts 4, 5. The small timing pulleys 19a, 19b are arranged in series with the large timing pulley 18 in between. The small timing pulleys 19a, 19b have the same size (outer diameter), and the medium timing pulleys 15, 16 also have the same size (outer diameter).

[0039] The intermediate timing pulley 15 and the intermediate timing pulley 16 are connected by a timing belt 21 , and the small timing pulleys 19 a , 19 b and the large timing pulley 18 are connected by a timing belt 22 .

[0040] When motor 14 is operated, intermediate timing pulley 15, which is attached integrally to rotating shaft 14a, rotates, and the rotation of intermediate timing pulley 15 is transmitted to intermediate timing pulley 16 via timing belt 21, so that intermediate timing pulley 16 rotates in the same direction and at the same rotation speed as rotating shaft 14a. The rotation of intermediate timing pulley 16 is transmitted via shaft body 1 to large timing pulley 18, which is integrated with intermediate timing pulley 15.

[0041] The rotation of the large timing pulley 18 is transmitted to the small timing pulleys 19a, 19b via the timing belt 22, so that the shafts 4, 5 to which the small timing pulleys 19a, 19b are respectively attached rotate at the same rotation speed in the same direction, and as a result, the two eccentric weight rotors 6, 7 also rotate synchronously in the same direction at the same rotation speed. Note that in the repeating moment generator 100, the rotation center lines of the two eccentric weight rotors 6, 7 are identical to the axis centers 4c, 5c of the shafts 4, 5, respectively.

[0042] In the repeating moment generator 100 shown in Fig. 5, the two eccentric weight rotors 6, 7 are arranged so that the eccentric directions of the centers of gravity of the respective weight members 6c, 7c (the directions of the centrifugal forces 6a, 7a shown in Fig. 6) differ by 180 degrees from each other about the axes 4c, 5c of the respective shafts 4, 5. Therefore, the two eccentric weight rotors 6, 7 rotate while maintaining a relationship in which the directions of the respective centrifugal forces 6a, 7a differ by 180 degrees from each other about the rotation center lines (axes 4c, 5c).

[0043] When the weight members 6c, 7c are in a state where their centers of gravity are eccentric from the axes 4c, 5c, and the eccentric weight rotors 6, 7 rotate with the rotation of the shafts 4, 5 driven by the driving force of the motor 14, the weight members 6c, 7c also rotate about the axes 4c, 5c, and centrifugal forces 6a, 7a whose magnitude is determined by the amount of eccentricity of the centers of gravity of the weight members 6c, 7c and the number of rotations are generated in the axial direction of the bolt members 6e, 7e. The direction in which these centrifugal forces 6a, 7a act rotates around the axes 4c, 5c, so the direction of the centrifugal forces 6a, 7a changes up, down, left, and right with the rotation.

[0044] In this way, the two eccentric weight rotors 6, 7 rotate about their respective rotation centerlines (axial centers 4c, 5c), generating vibrations, which in turn vibrate both ends of the lever members 3a, 3b alternately up and down via the shafts 4, 5, causing the lever members 3a, 3b to repeat fine seesaw motions about the axial center 1c of the shaft 1, causing the shaft 1 integrated with the lever members 3a, 3b to repeat fine forward and reverse micro-rotations. Therefore, if a test piece (not shown) is set on the extension of the axial center 1c of the shaft 1, a repeated load (repeated moment) can be applied to the test piece.

[0045] In the repetitive moment generator 100, if the eccentricity of the centers of gravity of the weight members 6c, 7c is set to be the same, the centrifugal forces 6a, 7b will always be the same in magnitude and act in parallel and opposite directions, so that a sinusoidal repetitive couple (moment) will be generated when the eccentric weight rotors 6, 7 are rotated at a constant rotation speed. As a result, a repetitive moment is applied to a test material (not shown) set on the extension of the shaft 1, making it possible to perform a fatigue test on the test material.

[0046] In addition, if the eccentricity of the centers of gravity of the weight members 6c and 7c are set to be the same, the centrifugal forces 6a and 7b always act in the same magnitude, parallel and opposite directions, so that the force components that cause translational motion are always offset no matter where the eccentric weight rotors 6 and 7 are located, and no vibration occurs. As a result, the shaft body 1 and the forward / reverse fine rotation elastic bearing 50 that supports the shaft body are always in a state of being axially aligned with respect to the shaft center 1c. Rotational Symmetry Since only the moment is transmitted, the axis 1c of the shaft 1 remains stationary.

[0047] In the forward and reverse fine-rotation elastic bearing 50, which forms part of the repeating moment generating device 100, the shaft body 1 is supported by a pair of plate-shaped elastic members 53, 54 arranged symmetrically on either side of the shaft body 1. This not only makes it possible to stably support the shaft body 1, which rotates forward and reverse finely, in a fixed position, but also makes it possible to impart to the shaft body 1 a rotation angle proportional to the magnitude of the torsional moment loaded on the shaft body 1, and to impart a restoring force that returns the shaft body 1 to a fixed position where the rotation angle is zero against the torsional moment.

[0048] Furthermore, the forward / reverse fine-motion rotation elastic bearing 50, which supports the shaft 1 that rotates in forward and reverse fine movements in the repeating moment generating device 100, does not have any parts that come into contact with or separate from each other or slide in tiny areas, so noise and vibration during operation are extremely low and maintenance is unnecessary. Furthermore, since the number of parts that make up the forward / reverse fine-motion rotation elastic bearing 50 is small, it is possible to relatively easily simplify the structure and make it smaller and lighter.

[0049] Next, forward and reverse fine movement elastic rotation bearings 60, 70, 80, and 90 according to other embodiments of the present invention will be described with reference to Figures 7 to 14. Note that, among the components constituting the forward and reverse fine movement elastic rotation bearings 60, 70, 80, and 90 shown in Figures 7 to 14, those components common to the forward and reverse fine movement elastic rotation bearing 50 described above are given the same reference numerals as those shown in Figures 1 to 4, and descriptions thereof will be omitted.

[0050] 7 and 8, the forward / reverse fine rotation elastic bearing 60 includes a plurality of support portions 61a, 61b protruding from the inner peripheral surface of a short cylindrical support member 61, and plate-like elastic members 53, 54 whose base ends 53b, 54b are engaged with the support portions 61a, 61b, respectively, and whose tip ends 53a, 54a are engaged with the outer periphery of a short cylindrical boss 62 that is detachable from the shaft body 1. The plate-like elastic members 53, 54 have the same shape and size, and are arranged so that the central axis (not shown) of the boss 62 coincides with the central axis of the support member 61. The shaft body 1 is inserted into a through hole 62a opened in the boss 62, and the key grooves 1b, 62b are aligned and a key (not shown) is inserted, whereby the boss 62 and the shaft body 1 are fixed together.

[0051] Support portions 61a, 61b formed on the inner peripheral surface of the support member 61 at an interval of 180 degrees are mirror symmetrical with respect to the shaft body 1 (boss 62). The base end portion 53b (54b) and the tip end portion 53a (54a) of each of the plate-shaped elastic members 53, 54 having curved portions 53c, 54c are engaged at opposing positions with the shaft body 1 (boss 62) in between.

[0052] The forward / reverse fine rotation elastic bearing 60 is provided with a boss 62 having a through hole 62a into which the shaft body 1 can be inserted and removed, so that the forward / reverse fine rotation elastic bearing 60 can be distributed on the market as a single product. Also, a key groove 61c is provided on part of the outer circumferential surface of the support member 61. There are no limitations on the use or purpose of the forward / reverse fine rotation elastic bearing 60, but it can be attached to and used in various devices such as a repeating moment generating device, and exerts the same actions and effects as the forward / reverse fine rotation elastic bearing 50 shown in FIG.

[0053] 9 and 10, three plate-shaped elastic members 73, 74, 75 and a shaft body 1 are arranged inside a polygonal (hexagonal) ring-shaped support member 71. The plate-shaped elastic members 73, 74, 75 have the same shape and dimensions, and have the same shape and function as the plate-shaped elastic members 51, 52 shown in FIG.

[0054] The base ends 73b, 74b, 75b of the three plate-shaped elastic members 73, 74, 75 are arranged on the inner circumferential surface of the support member 71 at 60 degree intervals around the axis 1c of the shaft body 1, and are each fixed to the support member 71 with a plurality of bolts and nuts 72. The tip ends 73a, 74a, 75a of the plate-shaped elastic members 73, 74, 75 are arranged on the outer circumferential surface of the shaft body 1 at 60 degree intervals around the axis 1c, and are each fixed to the shaft body 1 with a plurality of bolts 76. The base ends 73b, 74b, 75b and the tip ends 73a, 74a, 75a of the plate-shaped elastic members 73, 74, 75 are engaged at opposing positions across the shaft body 1.

[0055] There are no limitations on the use or purpose of the forward / reverse fine rotation elastic bearing 70, but for example it can be attached to various devices such as a repeating moment generating device and used, and it exerts the same action and effect as the forward / reverse fine rotation elastic bearing 50 shown in Fig. 1. Note that in the forward / reverse fine rotation elastic bearing 70, three plate-shaped elastic members 73, 74, 75 are arranged inside the polygonal (hexagonal) ring-shaped support member 71, but this is not limited to this, and four or more plate-shaped elastic members can also be arranged.

[0056] Next, the forward / reverse fine rotation elastic bearing 80 shown in Figures 11 and 12 includes support members 81, 82 arranged around the shaft body 1 that finely rotates in the forward and reverse directions, and a plurality of elastic members 53, 54 whose base ends 53b, 54b are engaged with the support members 81, 82, respectively, and whose tip ends 53a, 54a are engaged with the outer periphery of the shaft body 1, and the base ends 53b, 54b and tip ends 53a, 54a of the elastic members 53, 54 are engaged at positions facing each other across the shaft body 1. The plurality of elastic members 53, 54 are plate-like elastic members of the same shape and size. The support members 81, 82 are integrally erected on a block body 85, and as shown in Figure 12, the support members 81, 82 and the block body 85 have a concave shape when viewed from the front.

[0057] 11 and 12, the forward / reverse fine-motion elastic rotation bearing 80 has the same function as two forward / reverse fine-motion elastic rotation bearings 50 shown in Fig. 1 arranged symmetrically along the axial direction of the shaft 1. By arranging a plurality of elastic members 53, 54 in parallel in this manner, it is possible to increase the elastic force supporting the shaft 1 which repeatedly rotates in forward and reverse directions at a small angle. The shape of the elastic members 53, 54 can be set arbitrarily, and the plate thickness and width do not need to be constant and can be freely changed from the base end to the tip end, but equivalent functions can be achieved by arranging elastic members of the same shape and dimensions at equal intervals.

[0058] 13 and 14, two coil springs 93, 94 and a shaft 1 are arranged inside a polygonal (square) ring-shaped support member 91. The coil springs 93, 94 have the same shape and dimensions, and base ends 93b, 94b of the coil springs 93, 94 are secured to the inner peripheral surface of the support member 91, while tip ends 93a, 94a of the coil springs 93, 94 are secured to the outer peripheral surface of the shaft 1 via flat connecting members 95, 96, respectively.

[0059] The coil springs 93, 94 are arranged so that their respective expansion and contraction directions (longitudinal directions) 93s, 94s are parallel to each other across the shaft body 1, and the connecting members 95, 96 are fixed to the outer circumferential surface of the shaft body 1 at positions spaced 180 degrees apart. The connecting members 95, 96 are fixed so as to protrude in the radial direction of the shaft body 1 from the axis 1c of the shaft body 1, and the expansion and contraction directions (longitudinal directions) 93s, 94s of the coil springs 93, 94 are perpendicular to the surface direction of the connecting members 95, 96.

[0060] The forward / reverse fine movement elastic rotation bearing 90 can be used in the same way as the forward / reverse fine movement elastic rotation bearing 50 shown in Fig. 1, and can achieve the same effects. Furthermore, the coil springs 93, 94 that make up the forward / reverse fine movement elastic rotation bearing 90 have a simple shape and are readily available general-purpose parts, so that the forward / reverse fine movement elastic rotation bearing 90 can have a simplified structure and reduced manufacturing costs.

[0061] Note that the forward and reverse fine motion elastic rotation bearings 50, 60, 70, 80, and 90 described based on Figures 1 to 14 are examples of forward and reverse fine motion elastic rotation bearings according to the present invention, and the forward and reverse fine motion elastic rotation bearings according to the present invention are not limited to the forward and reverse fine motion elastic rotation bearings 50, 60, 70, 80, and 90 described above. [Industrial Applicability]

[0062] The forward and reverse fine rotation elastic bearing according to the present invention can be widely used in various mechanical devices as a mechanism for supporting a shaft that repeats forward and reverse fine rotations at a small angle. [Explanation of symbols]

[0063] 1,4,5 axis body 1b, 61c, 62b keyway 1c,4c,5c axis center 3a,3b Lever member 6,7 Eccentric weight rotor 6a,7a Centrifugal force 6b, 7b Enlarged diameter section 6c,7c Weight member 6d,7d lock nut 6e,7e Bolt parts 6f, 7f Stopper part 6g,7g weight 6h,7h,38 through hole 14 Motor 14a Rotation axis 15,16 Middle timing pulley 17 Gearbox 18 Large timing pulley 19a, 19b Small timing pulley 21,22 Timing belt 24 Tables 24c corner 25 Support legs 25a Top 25b Bottom plate 26 Under Table 50,60,70,80,90 Positive and reverse fine-motion elastic bearing 51, 52, 61, 71, 81, 82, 91 Support members 51s left side 52s right side 53, 54, 73, 74, 75 Elastic member (plate-shaped elastic member) 53a,54a,73a,74a,75a Tip 53b,54b,73b,74b,75b Base end 53c,54c curved section 53t,54t plate thickness 55,85 Block letters 56,57b,58b,59,76 Bolts 57n,58n Nut 61a,61b Support part 62 Boss 62a through hole 72 Bolts and nuts 93,94 Coil spring 93s, 94s Stretch direction (longitudinal direction) 95,96 Connecting member 100 Repeated Moment Generator

Claims

[Claim 1] A support member disposed around a shaft body that rotates slightly in forward and reverse directions; a plurality of elastic members each having a base end side engaged with the support member and a tip end side engaged with an outer periphery of the shaft body, In a forward / reverse fine rotation elastic bearing, a base end side and a tip end side of the elastic member are engaged at positions where the elastic member can deform rotationally symmetrically about an axis of the shaft when a torsional moment is applied to the shaft, the plurality of elastic members are plate-shaped elastic members each having a curved portion curved so as to surround a semicircular region around the shaft body, The plate-shaped elastic member has a portion where the plate thickness decreases from the base end toward the tip end.

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