JP2004225785A - Linear drive unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear drive unit in which the number of components can be reduced to shorten the manufacturing period, and in which countermeasures to overload of a rotation drive source such as an electric motor can be easily taken to reduce manufacturing cost. <P>SOLUTION: This linear drive unit 10 is provided with a driven body 16 disposed having a rod 14 at a center, and an reciprocating mechanism 17 for that. The reciprocating mechanism 17 comprises the rod 14 that is circular and rotatable, a plurality of roller bearings 26 and 27 disposed to be partly inscribed to projected rings formed on the inner side of inner rings 22 and 23 respectively at a constant rotation angle α at a plurality of positions in an outer circumference of the rod 14, and a support frame member 16a integrated with or connected to the driven body 16 to fix and support outer rings 28 and 29 of the roller bearings 26 and 27. Two of projected rings 24, 24a, 25, and 25a are provided to each of the roller bearings 26 and 27. The driven body 16 is thus linearly moved as the rod 14 is rotated. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention includes a driven body arranged with a rod having a circular cross section in the center, and the driven body linearly moves along the rod by rotation of the rod, or a driving body arranged with the rod as an axis. The present invention relates to a linear drive device including a body, wherein a rod moves linearly by rotation of a driver.
[0002]
[Prior art]
Conventionally, a pneumatic or hydraulic cylinder is generally used as a linear drive device, and a driven body is provided on a rod of the cylinder. As another linear drive device, an electric screw type is used. In this device, an electric motor rotates a screw shaft via a speed reduction mechanism, and is screwed into a male screw portion formed on the screw shaft. A nut member provided with a female screw part to be advanced or retracted in the axial direction via a detent (linear guide), and furthermore, in order to improve power transmission efficiency, a screw member is provided between the male screw part and the female screw part of the screw shaft. There are also cases where a large number of balls are inserted into the device (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-63-154038 (FIG. 1)
[0004]
[Problems to be solved by the invention]
However, the conventional linear drive has the following problems to be solved.
In the case of the cylinder type, since a pressure supply source such as an air compressor or a hydraulic pump, piping and various valves are required, the number of components increases, the production period becomes longer, and the production cost increases. In addition, there is a problem that much time is required for maintenance work.
Also, in the case of the electric screw type, it is necessary to perform screw processing in which a ball is arranged on the male screw portion of the screw shaft, and the number of components increases, so that the manufacturing period is increased and the manufacturing cost is increased. There was a problem. In addition, when the electric motor is overloaded due to the load condition, for example, electrical overload measures and mechanical overload measures are required to prevent damage or breakage of the screw shaft, deceleration mechanism, etc. This complicates the configuration of the device and makes the device expensive.
[0005]
The present invention has been made in view of such circumstances, and can reduce the number of components to shorten the manufacturing period, and can easily take measures against overload of a rotary drive source such as an electric motor, and as a result, It is an object of the present invention to provide a linear drive device capable of reducing the manufacturing cost.
[0006]
[Means for Solving the Problems]
A linear driving device according to a first aspect of the present invention is a linear driving device including a driven body disposed with a rod at the center, and a moving mechanism for moving the driven body, wherein the moving mechanism is circular. A plurality of rolling bearings in which a part of a protruding ring formed inside the inner ring is inscribed at a plurality of positions on the outer periphery of the rod at a fixed turning angle at a plurality of positions on the outer periphery of the rod, and a plurality of rolling bearings; A support frame member fixedly supporting the outer ring of the bearing and being integrated or connected to the driven body, and two protruding rings are provided for the inner ring of each rolling bearing, and the driven body is rotated by rotation of the rod. Moves linearly along the rod. As a result, at a plurality of positions on the outer periphery of the circularly rotatable rod, a part of the protruding ring provided on the inner ring of the plurality of rolling bearings is inscribed at a fixed turning angle, so that when the rod is rotated, The driven body can move linearly along the rod, and in particular, since the inner ring of the rolling bearing is provided with two protruding rings, a large propulsive force can be generated.
[0007]
A linear drive device according to a second aspect of the present invention is a linear drive device including a drive unit disposed around a rod as an axis, and an advance / retreat mechanism that advances / retreats the rod by rotation of the drive unit. The reciprocating mechanism includes a circularly arranged rod that is non-rotatably and reciprocally disposed, and a plurality of positions on the outer periphery of the rod in which a part of a protruding ring formed inside the inner ring at a fixed turning angle is inscribed. A plurality of rolling bearings to be arranged, a support frame member fixedly supporting the outer ring of the rolling bearing, and being connected to a rotary drive source, and two protruding rings are provided for the inner ring of each rolling bearing, The rod moves linearly by the rotation of the support frame member. As a result, at a plurality of positions on the outer periphery of the circular, non-rotatable and retractable rod, a part of the protruding ring provided on the inner ring of the plurality of rolling bearings is inscribed at a fixed turning angle, so that the support frame is provided. When the member is rotated, the rod can move linearly along the driving body. In particular, since two protruding rings are provided on the inner ring of the rolling bearing, a large propulsive force can be generated.
[0008]
In the linear drive device according to the first and second inventions, the plurality of rolling bearings are three or more, and the pressing force of the rolling bearing against the rod is balanced, and the total pressing force of the rolling bearing is the supporting frame member. It can also be configured to be offset within. As a result, it is not necessary to apply an excessive load to the rod and the support frame member.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.
Here, FIG. 1 is an overall configuration diagram of a linear press using a linear drive according to an embodiment of the present invention, FIG. 2 is a side view of a linear press using the same linear drive, and FIG. FIG. 4 is an enlarged cross-sectional view of a main part of the forward / backward mechanism of the linear drive device. FIG. 4 is a schematic side sectional view of the forward / backward mechanism of the linear drive device. FIG. 5 is a two-row rolling bearing of the forward / backward mechanism of the linear drive device. FIG. 6 is a front cross-sectional view of an end distance piece of an advance / retreat mechanism used in the linear drive device, and FIG. 7 is a front cross-sectional view of an intermediate position distance piece of the advance / retreat mechanism used in the linear drive device. FIG. 8 is a side view of each distance piece of the advance / retreat mechanism used in the linear drive device, and FIG. 9 is a front sectional view of a support frame member of the advance / retreat mechanism used in the linear drive device.
[0010]
As shown in FIGS. 1 and 2, a linear driving device 10 according to an embodiment of the present invention is used in a linear press machine 11, and the linear driving device 10 is a driven device arranged with a rod 14 at the center. A body 16 and an advancing / retreating mechanism 17 for the driven body 16 are provided. In the linear press 11, the driven body 16 linearly moves along the rod 14 by the rotation of the rod 14, and a pressed material (shown in the drawing) is provided by a ring-shaped press fitting 15 provided at the distal end of the driven body 16. ) Is pressed. Hereinafter, these will be described in detail. The direction in which the driven body 16 advances and retreats is defined as the front-back direction.
[0011]
As shown in FIGS. 1 and 2, the linear press 11 includes an electric motor 12 with a speed reducer, which is an example of a rotary drive source that rotates a rod 14. A rod 14 having a circular cross section connected to an output shaft 32 of the electric motor 12 with a speed reducer, and a press fitting 15 are provided at the distal end, and a driven body 16 which advances and retreats along the axial direction of the rod 14 by rotation of the rod 14. And a support frame member 16a integrated with the support frame member 16a.
[0012]
That is, as shown in detail in FIG. 1 and FIGS. 3 to 5, the advance / retreat mechanism 17 moves the rotatable rod 14 and a plurality of (four in the present embodiment) positions on the outer periphery of the rod 14 respectively. A part of the two protruding rings 24, 24a and two protruding rings 25, 25a formed inside the inner rings 22, 23 at a constant turning angle α is inscribed at points O and P, respectively. (In the present embodiment, 2 / location × 4 locations = 8) rolling bearings 26, 27, and a support frame member 16a for fixedly supporting the outer rings 28, 29 of the rolling bearings 26, 27. ing. The symbol T in FIG. 4 represents the axis of the rod 14.
As shown in FIGS. 1 and 3, the support frame member 16 a includes a cylindrical body 16 b whose axis coincides with the rod 14. Both ends of the cylindrical body 16 b in the axial direction are provided with a front block 18. And a rear block 19, and the rod 14 is inserted into through holes 20 and 21 formed in the center of the front block 18 and the rear block 19.
[0013]
As shown in FIGS. 1 and 2, the electric motor 12 with a speed reducer includes a motor body 30 and a speed reducer unit 31, and the speed reducer unit 31 is an input shaft connected to an output shaft of the motor body 30. And a reduction gear such as a worm gear connected to the input shaft, and an output shaft 32 connected via a key 38 to a final portion of the reduction gear.
The reduction gear unit 31 integrally attached to the motor main body 30 is provided on the rear side of the lower end portion, and is further provided with four long mounting bolts 33 on a rectangular fixing seat plate 34 on which a tap screw is formed. Has been fixed through. A rectangular bearing mounting plate 35 having the same size as the fixing seat plate 34 is disposed in parallel with the fixing seat plate 34 so as to face the fixing seat plate 34 with the reduction gear unit 31 interposed therebetween. At four corners of the seat plate 34 and the bearing mounting plate 35, both ends of four rod-shaped spacers 36 that determine the distance between the fixing seat plate 34 and the bearing mounting plate 35 are fixed to the fixing seat plate 34 and the bearing mounting plate 35. 35 are fastened by fixing bolts 37 respectively.
[0014]
At the end of the output shaft 32 of the electric motor 12 with the speed reducer on the rod 14 side, a connecting recess 39 having a groove-like cross section is formed in the radial direction of the output shaft 32, and has a convex cross-section engaging with the connecting recess 39. The connecting projection 40 is formed at the end of the rod 14 on the output shaft 32 side. Bearings 42 and 43 are mounted on the shaft end of the rod 14 on the output shaft 32 side via a bearing mounting member 41, and the bearing 42 is fixed in the axial direction by a bearing nut 44. The ring-shaped end of the bearing mounting member 41 on the output shaft 32 side is fitted in a circular hole 45 formed in the center of the bearing mounting plate 35, and the periphery of the circular hole 45 is arranged in the circumferential direction. It is fixed to the bearing mounting plate 35 by a plurality of (six in this embodiment) mounting bolts 46. With this configuration, the rod 14 can be rotated via the output shaft 32 by driving the electric motor 12 with a speed reducer.
[0015]
As shown in FIGS. 1, 3 and 5, between the front block 18 and the rear block 19, two sets of two rolling bearings 26 and two sets of two rolling bearings 27 are provided. As shown schematically in FIG. 4, it is mounted with a constant turning angle (lead angle) α (for example, α = 5 °, 7.5 °) with respect to a direction orthogonal to A part of the projecting rings 24 (24a) and 25 (25a) formed on the inner peripheral portions of the inner rings 22 and 23 of the rolling bearings 26 and 27 is partially opposed to the outer peripheral surface 47 of the rod 14, that is, 180 ° out of phase. The points O and P shown in FIG. 4 (however, the points O and P shown in FIG. 4 respectively represent the center positions in the circumferential direction between the two points O shown in FIG. 5). It is configured to be inscribed in a pressed state.
[0016]
Therefore, the pressing force of the rolling bearings 26 and 27 against the rod 14 is balanced, and the entire pressing force of the rolling bearings 26 and 27 is offset in the support frame member 16a. No unnecessary moment is generated at 16a. In particular, since two protruding rings 24, 24a and two protruding rings 25, 25a are formed on the inner peripheral portions of the inner rings 22, 23 of the rolling bearings 26, 27, respectively, the frictional force due to the internal contact is large. As a result, a large propulsive force can be generated in the axial direction.
[0017]
As shown in FIG. 1, in order to hold the rolling bearings 26 and 27 at a constant turning angle α with respect to a direction perpendicular to the axis of the rod 14, front blocks 18 provided at both ends of the support frame member 16a, Distance end pieces 48 and 49 are respectively fitted between the rear block 19 and the rolling bearings 26 and 27 on both sides, and a distance piece for an intermediate position is provided between the rolling bearing 26 and the rolling bearing 27. 50 to 52 are fitted.
As shown in FIG. 1 and FIGS. 6 to 8, the end distance pieces 48 and 49 have the same shape, and are arranged with their inclined sides facing each other in the axial direction. The intermediate position distance pieces 50 to 52 also have the same shape, the intermediate position distance pieces 50 and 52 on both axial sides are arranged in the same phase, and the intermediate position distance piece 51 at the axial center is: The intermediate position distance pieces 50 and 52 are arranged 180 ° out of phase.
[0018]
As shown in FIG. 6, one side (inside) of the end distance pieces 48, 49 has an inclination angle α (same as the turning angle of the rolling bearings 26, 27) α, and as shown in FIG. Both side surfaces of the distance pieces 50 to 52 are formed at an inclination angle α. In addition, as shown in FIGS. 6 to 8, in order to fix the end distance pieces 48, 49 and the intermediate position distance pieces 50 to 52 to the cylindrical body 16b, the end distance pieces 48, 49 and the intermediate position Key grooves 53 and 54 and key grooves 55 and 56 are formed at two opposing outer peripheral portions of the distance pieces 50 to 52 having the outer diameter N, respectively. On the other hand, FIGS. As shown in the figure, two opposed portions of the inner peripheral surface (inner diameter N) of the cylindrical body 16b into which the end distance pieces 48 and 49 and the intermediate position distance pieces 50 to 52 (outer diameter is N) fit. , Key grooves 57 and 58 are formed.
[0019]
As shown in FIGS. 3, 4 and 8, the key grooves 57, 58 of the cylindrical body 16b, the key grooves 53, 54 of the end distance pieces 48, 49 and the key grooves of the intermediate position distance pieces 50-52. 55 and 56 are provided with parallel keys 59 and 60, and the parallel keys 59 and 60 are fixed to the cylindrical body 16b by screw fastening via tap screws 61 formed at four places of the cylindrical body 16b. I have. The support frame member 16a includes distance pieces 48, 49 for the end, distance pieces 50 to 52 for the intermediate position, a cylindrical body 16b, and parallel keys 59, 60. 1 and 3, the parallel keys 59 and 60 are indicated by dotted lines.
[0020]
As shown in FIG. 5, the two rolling bearings 26 (the same applies to the case of the two rolling bearings 27) are made of ball bearings, and the inner ring 22 is obtained by removing the hatched portion from the commercially available one over the entire circumference. Shape. That is, two projecting rings 24, 24a having a semicircular cross section are formed on both sides in the width direction of the inner peripheral portion of the inner ring 22, and the inner diameter of the projecting rings 24, 24a is larger than the outer diameter J of the rod 14. It is formed larger by β. For example, when J = 50 mm, β is set to 2 mm, and the inner diameters of the protruding rings 24 and 24a are (J + β) = 52 mm. In this dimension, since a circle having an outer diameter of 50 mm and a circle having an inner diameter of 52 mm are inscribed at point O, at a position shifted by 90 ° from point O (inscribed position), the gap is less than about 1 mm. At a position deviated from the inscribed position (point O) by 180 ° (a position substantially overlapping the point O on the paper surface), the gap is less than about 2 mm.
[0021]
3 and 5 are front sectional views, and the contact position (contact position) between the protruding rings 24, 24a of the rolling bearing 26 and the rod 14 is shifted by about 90 ° in the circumferential direction on the front side ( On the other hand, the contact position (contact position) between the projecting rings 25, 25a of the rolling bearing 27 and the rod 14 is a circle from the point O, as schematically shown in a side sectional view in FIG. This indicates that the sides are opposite sides (point P) shifted by 180 ° in the circumferential direction. As shown in FIGS. 1, 4, 5, and 9, two rolling bearings 26 and two rolling bearings are provided on both sides of the cross section of the cylindrical body 16b so that these contact positions can be reliably set. Female screw portions 65, 66 for mounting set bolts 63, 64 capable of pressing the outer peripheral surfaces 62 of the respective outer rings 28, 29 are formed.
[0022]
In this configuration, the rolling bearing 26 and the rolling bearing 27 are mounted so as to have a fixed turning angle α with respect to a direction perpendicular to the axis of the rod 14, respectively, and are formed on the inner peripheral portions of the inner rings 22, 23. With the configuration in which the protruding rings 24, 24a and the protruding rings 25, 25a are inscribed in a state pressed against the rod 14, the rotation of the rod 14 causes the inner rings 22, 23 of the rolling bearings 26, 27 to pivot around the rod 14. To roll. Since the inner rings 22, 23 of the rolling bearings 26, 27 are supported by frictional force in the axial direction of the rod 14, they can move with a predetermined large propulsive force. The support frame member 16a is provided with a detent (not shown) for the rotation of the inner rings 22 and 23. As the detent, for example, the support frame member 16a is fitted to two rod-shaped rotation prevention guides fixed to the bearing mounting member 41 in the circumferential direction and provided with sliding guides on the support frame member 16a. It can be guided in the front-back direction.
[0023]
The rotation of the inner rings 22, 23 of the rolling bearings 26, 27 by the rotation preventing causes the support frame member 16a to rotate via the steel balls 67 fitted between the inner rings 22, 23 and the outer rings 28, 29. Instead, it can be moved linearly along the axial direction. In this way, the driven body 16 including the support frame member 16a fixedly supporting the outer rings 28 and 29 of the rolling bearings 26 and 27 can be linearly moved in the axial direction of the rod 14 without rotating.
[0024]
Next, the operation of the linear press 11 using the linear drive device 10 according to one embodiment of the present invention will be described with reference to the drawings.
(1) As shown in FIG. 1, the linear press 11 provided with the press fitting 15 at the tip of the driven body 16 is fixed to a fixed base at a predetermined position via a fixing seat plate 34.
(2) The electric motor 12 with the speed reducer is driven to rotate the rod 14 of the advance / retreat mechanism 17.
[0025]
(3) The reciprocating mechanism including the rolling bearings 26, 27 in which the protruding rings 24, 24a and the protruding rings 25, 25a of the inner races 22, 23 incline with the rod 14 by the rotation of the rod 14 at an angle of rotation α and inscribed therein. 17, the driven body 16 having the support frame member 16a for fixedly supporting the outer rings 28 and 29 of the rolling bearings 26 and 27 can be advanced along the rod 14. In addition, since the driven body 16 is prevented from rotating, the pressed material can be processed without rotating the press fitting 15.
(4) When the press working is completed, the electric motor 12 with the speed reducer is rotated in the reverse direction, and the rod 14 of the advance / retreat mechanism 17 is rotated in the reverse direction, so that the press fitting 15 is moved to the retracted position without rotating.
[0026]
The present invention is not limited to the above-described embodiments, and changes can be made without departing from the spirit of the present invention. For example, some or all of the above-described embodiments and modifications are described. The present invention is also applicable to a case where the linear drive device of the present invention is configured in combination.
In the above-described embodiment, the driven body 16 is moved linearly along the rod 14 by the rotation of the rod 14. However, the present invention is not limited to this. May be configured to move linearly. That is, for example, in FIG. 1, the connection between the rod 14 and the output shaft 32 is released, the bearings 42 and 43 that receive one end of the rod 14 are removed, and the driven body 16 is separately connected to a rotational drive source. When the driving body (i.e., the support frame member) is rotated, the rod can move forward and backward along the axis of the driving body, and the rod is prevented from rotating. It has been rotated and cannot be rotated.
[0027]
Although two sets of two rolling bearings 26 and 27 are used, a total of eight rolling bearings are used. However, the present invention is not limited to this, and 2 to 7 or 9 or more can be used. Further, the two rolling bearings 26 and 27 are arranged as one set adjacent to each other, but the present invention is not limited to this, and one or three or more rolling bearings may be used as one set.
As shown in FIGS. 1 and 4, the two points O and P (inscribed position) are sequentially shifted by 180 ° to balance the pressing force of the rolling bearings 26 and 27 against the rod 14. In addition, the rolling bearings 26 and 27 are arranged so as to cancel the pressing forces at the four locations of the rolling bearings 26 and 27 in the support frame member 16a. However, the present invention is not limited to this. If necessary, another method, for example, By changing the number and the inscribed position of the rolling bearings, the pressing force can be balanced and the pressing force of the rolling bearing can be offset in the support frame member. Further, in some cases, it is not necessary to balance the pressing force or cancel the pressing force.
[0028]
The rolling bearings 26 and 27 are provided with two protruding rings 24 and 24a and the protruding rings 25 and 25a, respectively. However, the present invention is not limited thereto, and the rolling bearing may be provided with one protruding ring depending on the situation. .
Although the support frame member 16a is configured to be connected to the driven body 16 by screw fastening, the present invention is not limited to this, and the support frame member may be integrated with the driven body as necessary.
[0029]
【The invention's effect】
In the linear drive device according to claim 1 and claim 3 dependent on claim 1, when the rod is rotated, the driven body can linearly move along the rod, and in particular, the projecting ring is formed on the inner race of the rolling bearing. Are provided, a large propulsive force can be generated. Therefore, the threading of the rod is not required, the number of components can be reduced, the production period can be shortened, and the production cost can be reduced. Also, even if the rotational drive source is overloaded for any reason, the propulsion force is generated by the frictional force, so that the protruding ring slides axially on the outer peripheral surface of the rod and the driven body retreats, It is possible to easily take measures against overload of the rotary drive source, and as a result, it is possible to prevent damage and breakage of the speed reduction mechanism and the like. Furthermore, since it can be made compact, the installation space is small.
[0030]
In the linear drive device according to claim 2 and dependent on claim 2, when the support frame member is rotated, the rod can linearly move along the drive body, and in particular, protrudes from the inner race of the rolling bearing. Since two rings are provided, a large propulsive force can be generated. Therefore, the threading of the rod is not required, the number of components can be reduced, the production period can be shortened, and the production cost can be reduced. Even if the rotational drive source is overloaded for any reason, the propulsion force is generated by the frictional force, and the outer peripheral surface of the rod slides in the axial direction with respect to the projecting ring and retreats. Countermeasures against overload of the source can be easily performed, and as a result, damage or breakage of the speed reduction mechanism or the like can be prevented. Furthermore, if a rotary drive source composed of a driving hollow shaft motor is provided on the outer periphery of the support frame member, the device can be made compact and the installation space can be reduced.
In particular, in the linear drive device according to the third aspect, since an excessive load does not need to be applied to the rod and the support frame member, economical design can be performed and durability can be improved.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a linear press using a linear drive device according to an embodiment of the present invention.
FIG. 2 is a side view of a linear press using the same linear driving device.
FIG. 3 is an enlarged sectional view of a main part of an advance / retreat mechanism of the linear drive device.
FIG. 4 is a schematic side cross-sectional view showing a simplified reciprocating mechanism of the linear drive device.
FIG. 5 is a diagram showing the relationship between two rows of rolling bearings and rods of the advance / retreat mechanism of the linear drive device.
FIG. 6 is a front sectional view of a distance piece for an end of an advance / retreat mechanism used in the linear drive device.
FIG. 7 is a front sectional view of a distance piece for an intermediate position of an advance / retreat mechanism used in the linear drive device.
FIG. 8 is a side view of each distance piece of the advance / retreat mechanism used in the linear drive device.
FIG. 9 is a front sectional view of a support frame member of an advance / retreat mechanism used in the linear drive device.
[Explanation of symbols]
10: linear drive device, 11: linear press machine, 12: electric motor with reduction gear (rotary drive source), 14: rod, 15: press fitting, 16: driven body, 16a: support frame member, 16b: cylindrical body , 17: forward and backward mechanism, 18: front block, 19: rear block, 20, 21: through hole, 22, 23: inner ring, 24, 24a: projecting ring, 25, 25a: projecting ring, 26, 27: rolling bearing , 28, 29: outer ring, 30: motor body, 31: reduction gear, 32: output shaft, 33: mounting bolt, 34: fixing seat plate, 35: bearing mounting plate, 36: spacer, 37: fixing bolt, 38: key, 39: connecting concave portion, 40: connecting convex portion, 41: bearing mounting member, 42, 43: bearing, 44: bearing nut, 45: circular hole, 46: mounting bolt, 47: outer peripheral surface, 48, 49 ： Dead for end Stance piece, 50 to 52: Distance piece for intermediate position, 53, 54: Key groove, 55, 56: Key groove, 57, 58: Key groove, 59, 60: Parallel key, 61: Tap screw, 62: Outer peripheral surface , 63, 64: Set bolt, 65, 66: Female thread, 67: Steel ball

Claims (3)

A driven body disposed with the rod in the center, and a linear drive device including an advancing and retreating mechanism of the driven body,
The advancing and retreating mechanism is configured such that the rod is rotatably driven in a circular shape, and a plurality of protruding rings formed inside the inner ring at a fixed turning angle are inscribed at a plurality of positions on the outer periphery of the rod. A plurality of rolling bearings, and a supporting frame member fixedly supporting an outer ring of the rolling bearing, and being integrated or connected to the driven body,
A linear drive device wherein the protrusion ring is provided in two rows on the inner ring of each of the rolling bearings, and the driven body moves linearly along the rod by rotation of the rod. A linear drive device comprising: a driving body disposed around a rod as an axis; and an advance / retreat mechanism that advances / retreats the rod by rotation of the driving body,
The advancing / retracting mechanism includes a rod that is circularly arranged so as to be non-rotatable and advancing / retracting, and a plurality of protruding rings formed inside the inner ring at a plurality of positions on the outer periphery of the rod at a fixed turning angle. A plurality of rolling bearings arranged in contact with each other, fixedly supporting the outer ring of the rolling bearing, having a support frame member connected to a rotary drive source,
A linear drive device, wherein two protruding rings are provided for inner rings of the respective rolling bearings, and the rod moves linearly by rotation of the support frame member. The linear drive device according to any one of claims 1 and 2,
The plurality of rolling bearings are three or more, the pressing force of the rolling bearing against the rod is balanced, and the entire pressing force of the rolling bearing is offset in the support frame member. Linear drive device.

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