JP2016133139A - Feed screw device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a feed screw device in which a feed screw shaft is made light in its weight due to a simple configuration and its low cost and smooth position setting can be carried out.SOLUTION: This invention relates to a feed screw device in which a feed screw shaft A is press fitted to an outer peripheral surface of a cylindrical hollow pipe under utilization of elastic force of a coil spring returning back to its inner diameter side over an entire length of the coil spring, one end at the inner peripheral surface of inner race of a roller bearing is formed with a first annular groove and the other end is formed with a second annular groove, the roller bearing is removably stored in a holder 6 and fixed there and further, there is provided an elastic body acting as means for inclining the holder and pressing it against an element wire of the coil spring, there is provided inclination supporting segments 14 enabling the holder to be inclined, the feed screw shaft is passed through the inner radial sides of the first annular groove and the second annular groove, it is inclined to press against the coil spring element wire of the feed screw shaft and fitted there, the feed screw shaft is rotatably supported and its rotating motion is converted into a linear line motion.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a feed screw device that can be positioned with a simple configuration.

  In the control equipment field, when drawing, carving, drilling, cutting, moving an object, etc., in a mechanical part that moves in conjunction with a computer, depending on the load such as thrust load or radial load during movement The structure is different.

For example, in the case of a printer, the ink and its ejection device are lightweight, light such as a thrust load when moving in the X direction, and can be driven by a timing belt because it does not contact an object such as paper.

In the case of a 3D printer, an object is formed by repeatedly applying a resin dissolved in the X, Y, and Z directions. This is also relatively light such as a thrust load when moving in the X, Y, and Z directions.

In addition, in the case of equipment that requires 3 axes (X axis, Y axis, Z axis) such as CNC milling machine, motors or solenoids are installed around the Z axis, so the X axis and Y axis when moving The thrust load and the radial load received by the motion conversion part of the motor become heavy, and a feed screw device or a ball screw that can cope with it becomes necessary.

  At present, when the feed distance is short and the thrust load is light, timing belts are widely used like printers and 3D printers. Further, when the thrust load or radial load is relatively heavy regardless of the feed distance and accuracy is required, nut-type ball screws in which a plurality of balls circulate are widely used and utilized.

  Regarding the lead screw shaft, there is claim 1 of the applicant's patent No. 5660602. Patent Document 1 proposes a motion conversion unit that converts rotational motion into linear motion.

JP-A-08-159231

  The conventional ball screw pursues high quality, so individuals who like to make things and small and medium-sized enterprise owners have difficulty in making things in terms of price and weight, and their ideas have shrunk. In order to avoid this, a product that is both inexpensive and lightweight is also required.

Patent Document 1
The inner ring of the radial ball bearing is engaged with the screw groove to convert the rotational movement of the screw shaft into linear movement.

  In order for the inner ring of the radial ball bearing of Patent Document 1 to engage with the thread groove and change the motion, the corresponding thread groove depth is required, and if the depth is pursued, it is necessary to maintain the strength as the screw shaft. The benefits of weight reduction are lost.

In addition, when the inner ring of the radial ball bearing of Patent Document 1 is engaged with the thread groove, when the recess of the thread groove is 90 degrees, the protrusion on the inner ring side is also about 90 degrees, and the recess of the thread groove is semicircular. In this case, the convex portion on the inner ring side needs to be matched with a semi-circular shape, so that there is a problem that the configuration or options are limited, such as being usable only for the screw shaft.

Similarly, the conventional feed screw device or ball screw has a problem that the nut portion including the screw shaft must be changed when the pitch of the screw shaft is changed.

  The applicant's lead screw device patent No. 566602 has room for further improvement in the motion conversion unit that converts rotational motion into linear motion.

Regardless of Patent Document 1, the X-axis of a printer or the X-axis and Y-axis of a 3D printer usually uses a timing belt. There is a disadvantage that the longer the length in the feed direction and the higher the speed, the greater the error due to bending.
Therefore, it is an object to position as an intermediate between an inexpensive driving method using a timing belt and a ball screw driving method in which a plurality of balls that can be precisely positioned circulate.

  In view of the above-described problems, an object of the present invention is to provide a low-cost and lightweight feed screw device that can perform a smooth feed operation and precise positioning with a simple configuration.

  In order to solve the above problems, the present invention mainly has the following configuration.

The invention described in claim 1
The feed screw shaft has a hollow pipe with a circular cross section whose outer diameter and inner diameter are uniform in the axial direction, and an elastic force to return the coil spring to the inner diameter side over the entire length between both ends on the outer peripheral surface of the hollow pipe. The feed screw shaft press-fitted using,
A rolling bearing having a plurality of rolling elements interposed between the inner ring and the outer ring;
The inner circumferential surface of the inner ring forms a first annular groove that allows one end of the inner circumferential surface to be fitted into the coil spring, and a second annular groove that allows the other end to fit into the coil spring. And the inner diameter of the first annular groove and the second annular groove is larger than the outer diameter including the coil spring of the feed screw shaft,
The rolling bearing having the first annular groove and the second annular groove formed in the inner ring is detachably accommodated in the holder and fixed in the holder, and the holder is inclined and has an elastic body for pressing. And the holder is provided with an inclination hole or an inclination shaft so as to be inclined, and includes an inclination support portion for supporting the inclination hole or the inclination axis.
The feed screw shaft is inserted into the inner diameter side of the first annular groove and the second annular groove on the inner peripheral surface and inclined in the axial direction of the feed screw shaft;
Utilizing the elastic force of the elastic body, the coil spring element wire is pressed and fitted to the coil spring element wire at the groove part of the first annular groove, and the coil spring element is inserted into the groove part of the second annular groove at the other end. Press to fit the wire,
2. A feed screw device configured to equalize the pressing force at two locations that are inclined and fitted to the coil spring wire, and convert the rotational motion of the feed screw shaft into a linear motion.

The invention described in claim 2
The feed screw shaft has a hollow pipe with a circular cross section whose outer diameter and inner diameter are uniform in the axial direction, and an elastic force to return the coil spring to the inner diameter side over the entire length between both ends on the outer peripheral surface of the hollow pipe. The feed screw shaft press-fitted using,
A rolling bearing having a plurality of rolling elements interposed between the inner ring and the outer ring;
The inner peripheral surface of the inner ring has an annular groove that allows one end of the inner peripheral surface to be fitted to the coil spring, and the other side forms a conical shape that widens toward the end, and the annular groove and the conical shape The inner diameter is larger than the outer diameter including the coil spring of the feed screw shaft,
The rolling groove having the annular groove and the conical shape formed in the inner ring is detachably accommodated in the holder and fixed to the holder, and the holder is inclined and includes an elastic body for pressing, and the holder Is provided with a tilting hole or tilting shaft so as to be tiltable, and includes a tilting support portion that supports the tilting hole or tilting shaft,
The feed screw shaft is inserted into the annular groove on the inner peripheral surface and the inner diameter side of the conical shape, and is inclined in the axial direction of the feed screw shaft,
Using the elastic force of the elastic body, the groove portion of the annular groove is pressed and fitted to the coil spring element wire, and the other conical inner surface side is pressed to contact the coil spring element wire. A feed screw device configured to convert a rotational motion of the feed screw shaft into a linear motion.

The invention according to claim 3
The feed screw shaft has a hollow pipe with a circular cross section whose outer diameter and inner diameter are uniform in the axial direction, and an elastic force to return the coil spring to the inner diameter side over the entire length between both ends on the outer peripheral surface of the hollow pipe. The feed screw shaft press-fitted using,
A rolling bearing having a plurality of rolling elements interposed between the inner ring and the outer ring;
The inner peripheral surface of the inner ring has an annular groove that allows one end of the inner peripheral surface to be fitted to the coil spring, and the other end forms an annular protrusion on the inner diameter side, and the annular groove and the annular protrusion The inner diameter of the feed screw shaft is larger than the outer diameter including the coil spring,
The rolling bearing having the annular groove and the annular projection formed in the inner ring is detachably accommodated in the holder and fixed in the holder, and the holder is inclined and has an elastic body for pressing, and the holder Is provided with a tilting hole or tilting shaft so as to be tiltable, and includes a tilting support portion that supports the tilting hole or tilting shaft,
The feed screw shaft is inserted into the annular groove on the inner peripheral surface and the inner diameter side of the annular projection, and is inclined in the axial direction of the feed screw shaft;
Using the elastic force of the elastic body, the coil spring element wire is pressed and fitted in the groove portion of the annular groove, and the coil spring element of the feed screw shaft is connected to the other protrusion portion of the annular protrusion. A feed screw device configured to press and contact the hollow pipe in the gap between the wire and the strand to convert the rotational motion of the feed screw shaft into a linear motion.

The invention according to claim 4
The feed screw shaft has a hollow pipe with a circular cross section whose outer diameter and inner diameter are uniform in the axial direction, and an elastic force to return the coil spring to the inner diameter side over the entire length between both ends on the outer peripheral surface of the hollow pipe. The feed screw shaft press-fitted using,
A rolling bearing having a plurality of rolling elements interposed between the inner ring and the outer ring;
The inner peripheral surface of the inner ring has one end of the inner peripheral surface, an annular groove that allows the coil spring of the feed screw shaft to be fitted at a pitch that varies in the axial direction, and the other end expands toward the inner diameter side. Forms a gently curved trumpet shape, and the inner diameter of the annular groove and the trumpet shape is larger than the outer diameter including the coil spring of the feed screw shaft,
The rolling bearing formed with the annular groove and the trumpet shape on the inner ring is detachably accommodated in the holder and fixed to the holder, and the holder is inclined and has an elastic body for pressing, and the holder Is provided with a tilting hole or tilting shaft so as to be tiltable, and includes a tilting support portion that supports the tilting hole or tilting shaft,
The feed screw shaft is inserted into the annular groove on the inner peripheral surface and the inner diameter side of the trumpet type, and is inclined in the axial direction of the feed screw shaft,
Using the elastic force of the elastic body, the groove portion of the annular groove is pressed and fitted to the coil spring element wire, and the other inner surface side of the trumpet type is pressed and brought into contact with the coil spring element wire. A feed screw device configured to convert a rotational motion of the feed screw shaft into a linear motion.

The invention described in claim 5
The first annular groove and the second annular groove according to claim 1 formed on the inner peripheral surface of the inner ring of the rolling bearing, the annular groove and the conical shape according to claim 2, or the annular groove and the annular protrusion according to claim 3, or 5. The feed screw device according to claim 1, wherein the annular groove and the trumpet type are made of a synthetic resin that can be detachably fixed to the inner peripheral surface of the inner ring of the rolling bearing.

  The feed screw shaft of this feed screw device is in that the central portion of the coil spring strand can be used as a central point and the axial direction of the surface of the strand can be used as an element for motion conversion.

  The pitch setting of the coil spring of the feed screw shaft is not subject to lathe processing restrictions, so there is an advantage that the pitch of the coil spring can be increased freely and can be manufactured at low cost.

Further, by press-fitting a coil spring to the outer peripheral surface of the hollow pipe, there is an effect that the weight and cost can be reduced as a feed screw shaft. Moreover, a smooth feeding operation can be performed by using a rolling bearing for the motion converting portion.

According to the invention of claim 1,
A first annular groove and a second annular groove are formed on the inner peripheral surface of the inner ring of the rolling bearing, and the groove portion is fitted into two places by inclining, and the elastic spring is pressed against the coil spring element wire. , The feed screw device can be stably positioned without backlash in the axial direction (thrust direction) of the feed screw shaft.

According to invention of Claim 2,
An annular groove and a conical shape are formed on the inner peripheral surface of the inner ring of the rolling bearing, and the groove portion of the annular groove is fitted to the coil spring strand so as to be inclined, and the coil spring strand is formed on the conical inner peripheral surface. By making contact, the number of options increases, such as using either a feed screw shaft with the same pitch with a narrow pitch interval or a feed screw shaft with the same pitch with a wider pitch interval.

According to invention of Claim 3,
An annular groove and an annular protrusion are formed on the inner peripheral surface of the inner ring of the rolling bearing, and the groove portion of the annular groove is fitted to the coil spring element at an angle, and the protrusion part of the annular protrusion is connected to the element wire of the coil spring. It is in contact with the hollow pipe in the gap between the wires. In particular, it can be adopted when the pitch is wide and the pitch is the same.

According to invention of Claim 4,
An annular groove and a trumpet shape are formed on the inner peripheral surface of the inner ring of the rolling bearing, and the groove portion of the annular groove is fitted to the coil spring strand in an inclined manner, and the coil spring strand is formed on the inner peripheral surface of the trumpet shape. By making contact, a feed screw shaft with a pitch interval change in the axial direction of the feed screw shaft, a feed screw shaft with the same pitch with a narrow pitch or a wider pitch, etc., and three types of feed screw shafts are used Possible, advantageous and versatile.

Further, a feed screw shaft having a change in the pitch interval of the coil springs of the feed screw shaft can change the feed speed at the location even if the rotation of the feed screw shaft is constant.

  When it is necessary to change the pitch of the screw shaft, such as a conventional feed screw device or ball screw device, the nut portion including the screw shaft must be replaced. In this case, since the motion is converted in the axial direction at one groove portion of the annular groove, only the screw shaft (here, the feed screw shaft) needs to be replaced, which is economical.

According to a fifth aspect of the present invention, the first annular groove and the second annular groove are formed on the inner peripheral surface of the inner ring of the rolling bearing,
Or annular groove and conical shape,
Or the shape of the annular groove and annular protrusion,
Alternatively, a generally used rolling bearing can be used by forming the annular groove and the trumpet shape with a synthetic resin that can be detachably fixed.

(A) is a front view of the same pitch feed screw shaft, and (b) is a side view thereof. (A) is the front view which accommodated the rolling bearing which formed the 1st annular groove and the 2nd annular groove in the inner ring in the holder, (b) is the side view, (c) is the BB 'line of (a). It is sectional drawing which follows. It is a front view of the inclination support part which enables the holder of FIG. 2 to incline. It is the front view which combined the holder of FIG. 2, and the inclination support part of FIG. It is a figure explaining the positional relationship of an elastic body especially except the inclination support part of FIG. It is sectional drawing of the axial direction of the feed screw shaft of FIG. 1 is an overall view according to Embodiment 1. FIG. (A) is a front view of the same pitch feed screw shaft, and (b) is a side view thereof. (A) is the front view which accommodated the rolling bearing which formed the annular groove and the conical shape in the inner ring | wheel in the holder, (b) is the side view, (c) is sectional drawing which follows the GG 'line of (a). is there. It is a front view of the inclination support part which enables the holder of FIG. 9 to incline. It is the front view which combined the holder of FIG. 9, and the inclination support part of FIG. It is a figure explaining especially the positional relationship of an elastic body except the inclination support part of FIG. It is sectional drawing of the axial direction of the feed screw shaft of FIG. 6 is an overall view according to Embodiment 2. FIG. (A) is a front view of the same pitch feed screw shaft, and (b) is a side view thereof. (A) is the front view which accommodated the rolling bearing which formed the annular groove | channel and the annular protrusion in the inner ring | wheel in the holder, (b) is the side view, (c) is sectional drawing in alignment with the LL 'line of (a). is there. It is a front view of the inclination support part which enables the holder of FIG. 16 to incline. It is the front view which combined the holder of FIG. 16, and the inclination support part of FIG. It is a figure explaining especially the positional relationship of an elastic body except the inclination support part of FIG. FIG. 20 is a cross-sectional view of the feed screw shaft of FIG. 19 in the axial direction. FIG. 6 is an overall view according to a third embodiment. (A) is a front view of the same pitch feed screw shaft, and (b) is a side view thereof. (A) is a front view of a feed screw shaft with a change in pitch interval, and (b) is a side view thereof. (A) is the front view which accommodated the rolling bearing which formed the annular groove and the trumpet shape in the inner ring in the holder, (b) is the side view, (c) is a sectional view which meets the RR 'line of (a). is there. It is a front view of the inclination support part which enables the holder of FIG. 24 to incline. It is the front view which combined the holder of FIG. 24, and the inclination support part of FIG. It is a figure explaining especially the positional relationship of an elastic body except the inclination support part of FIG. It is sectional drawing of the axial direction of the feed screw shaft of FIG. FIG. 6 is an overall view according to a fourth embodiment. The first annular groove and the second annular groove are made of synthetic resin, (a) is a front view thereof, and (b) is a sectional view attached to the rolling bearing. An annular groove and a conical shape are made of synthetic resin, (a) is a front view thereof, and (b) is a cross-sectional view attached to a rolling bearing. An annular groove and an annular projection are made of synthetic resin, (a) is a front view thereof, and (b) is a sectional view attached to a rolling bearing. An annular groove and a trumpet shape are made of synthetic resin, (a) is a front view thereof, and (b) is a sectional view attached to a rolling bearing. (A) is a holder front view, (b) is a holder side view. It is a general view which employ | adopted the holder of FIG. It is explanatory drawing of a mode that an annular groove fits into the coil spring of a feed screw shaft. It is explanatory drawing of the conditions for which the groove part of an annular groove fits with a coil spring.

  Examples 1, 2, 3, 4, 5 are described in order of the embodiment of the present invention, and then common parts of Examples 1, 2, 3, 4, or 5 are described.

  An embodiment of claim 1 will be described.

  The feed screw shaft (A in FIG. 1) of claim 1 uses a feed screw shaft in which coil springs (2 in FIG. 1) are arranged at the same pitch in the axial direction on the outer peripheral surface of the hollow pipe (1 in FIG. 1). It is a screw device.

The feed screw shaft (A in FIG. 1) is a feed screw shaft that is press-fitted on the outer peripheral surface of the hollow pipe by using an elastic force to return the coil spring to the inner diameter side over the entire length between both ends.

The inner peripheral surface of the inner ring (3 in FIG. 2) of the rolling bearing has a first annular groove (4 in FIG. 2 (c)) at one end of the inner peripheral surface and a second annular groove (FIG. 2 (2) in the other end. c) 5) is formed,
The holder (6 in FIG. 2) has a screw hole (8a in FIG. 2) for tilting on both sides of the holder parallel to the center point (C in FIG. 2 (a)) of the bearing housing (7 in FIG. 2). 8b) and provided with elastic holes (13a and 13b in FIG. 2) for tilting and pressing,

A rolling bearing having a first annular groove and a second annular groove is detachably housed in a bearing housing portion (7 in FIG. 2) of a holder (6 in FIG. 2), and a screw (9 in FIG. 2) and a washer. (10 in FIG. 2) and a nut (11 in FIG. 2) are engaged and fixed to the outer ring (12 in FIG. 2),

The tilt support portion (14 in FIG. 3) that allows the holder to tilt is provided with a hole (15 in FIG. 3) having a diameter larger than that including the coil spring of the feed screw shaft in the center, and moves parallel to the feed screw shaft. A connecting hole (16 in FIG. 3) is provided so as to be connectable to the guide to be connected, and further, locking holes (17a and 17b in FIG. 3) for locking the elastic body are provided. Bolt holes (18a and 18b in FIG. 3) are provided for tilt support.

The tilting support portion (14 in FIG. 4) that allows the holder to tilt is provided on both sides of the holder so that there is no so-called rattling with bolts (19 in FIG. 4), washers (20 in FIG. 4) and nuts (21 in FIG. 4). Screwed into the screw holes (8a and 8b in FIG. 4) and supported by sliding in the tilt direction of the holder,

The elastic body (22a and 22b in FIG. 5) is inserted into the hole for elastic body (13a and 13b in FIG. 4) and locked by the locking holes (17a and 17b in FIG. 3). The groove portion of the first annular groove is fitted and pressed (D in FIG. 6) to the coil spring of the feed screw shaft while being inclined in the axial direction of the shaft (A of FIG. 6), and the groove of the second annular groove The part is fitted (E in FIG. 6) and pressed,

The connecting member (23 in FIG. 7) for connecting the inclined support part (14 in FIG. 7) and the guide moving in parallel with the axial direction of the feed screw shaft is connected via the connecting hole (16 in FIG. 3). It is fixed with a screw, washer, nut, etc., and is connected to a guide through pin holes (24a and 24b in FIG. 7) so that there is no so-called rattling. The rotational movement of the feed screw shaft (A in FIG. 7) is linearly moved It becomes the composition which changes the movement.

  An adjustment function may be provided between the first annular groove and the second annular groove of the first embodiment so as to be able to cope with a change in the pitch of the coil spring by using a spacer or the like.

An embodiment of claim 2 will be described.

The feed screw shaft (F in FIG. 8) according to claim 2 uses a feed screw shaft in which coil springs (51 in FIG. 8) are arranged at the same pitch in the axial direction on the outer peripheral surface of the hollow pipe (50 in FIG. 8). It is a screw device.

The feed screw shaft (F in FIG. 8) is a feed screw shaft that is press-fitted on the outer peripheral surface of the hollow pipe by using an elastic force to return the coil spring to the inner diameter side over the entire length between both ends.

The inner peripheral surface of the inner ring (52 in FIG. 9) of the rolling bearing has an annular groove (53 in FIG. 9 (c)) at one end of the inner peripheral surface, and a conical shape that widens toward the other end (FIG. 9 (c)). 54) is formed,
The holder (55 in FIG. 9) has a screw hole (57a in FIG. 9) for tilting on both sides of the holder parallel to the center point (H in FIG. 9 (a)) of the bearing housing (56 in FIG. 9). 57b) and inclined holes for elastic bodies (62a and 62b in FIG. 9) are provided,

The bearing (55 in FIG. 9) of the holder (56 in FIG. 9) detachably accommodates a rolling bearing formed with an annular groove and a conical shape with a widening end, and a screw (58 in FIG. 9) and a washer (see FIG. 9). 9 and 59) and a nut (60 in FIG. 9) are engaged and fixed to the outer ring (61 in FIG. 9).

The tilt support portion (63 in FIG. 10) that can tilt the holder is provided with a hole (64 in FIG. 10) having a diameter larger than that including the coil spring of the feed screw shaft in the center, and also moves in parallel with the feed screw shaft. A connecting hole (65 in FIG. 10) is provided to enable connection with the guide to be operated, and further, locking holes (66a and 66b in FIG. 10) for locking the elastic body are provided. Bolt holes (67a and 67b in FIG. 10) are provided for tilt support.

The tilt support portion (63 in FIG. 11) that allows the holder to tilt is provided on both sides of the holder so that there is no so-called rattling by the bolt (68 in FIG. 11), the washer (69 in FIG. 11), and the nut (70 in FIG. 11). Screwed into the screw holes (57a and 57b in FIG. 11) and supported by sliding in the tilt direction of the holder,

The elastic body (71a and 71b in FIG. 12) is inserted into the hole for elastic body (62a and 62b in FIG. 11), and is locked by the locking hole (66a and 66b in FIG. 10). At the same time as the shaft (F in FIG. 13) inclines in the axial direction, the groove portion of the annular groove fits and presses against the coil spring of the feed screw shaft (I in FIG. 13), and the inner diameter side of the end conical cone comes into contact Press (J in FIG. 13),

The connecting member (72 in FIG. 14) for connecting to the inclined support part (63 in FIG. 14) and the guide moving in parallel with the axial direction of the feed screw shaft is connected via the connecting hole (65 in FIG. 10). Fixed with screws, washers, nuts, etc., and connected to the guide via pin holes (73a and 73b in FIG. 14) so that there is no so-called rattling,
The rotational motion of the feed screw shaft (F in FIG. 14) is converted into a linear motion.

  An embodiment of claim 3 will be described.

  The feed screw shaft (K in FIG. 15) of claim 3 uses a feed screw shaft in which coil springs (101 in FIG. 15) are arranged at the same pitch in the axial direction on the outer peripheral surface of the hollow pipe (100 in FIG. 15). It is a screw device.

The feed screw shaft (K in FIG. 15) is a feed screw shaft that is press-fitted on the outer peripheral surface of the hollow pipe by using an elastic force to return the coil spring to the inner diameter side over the entire length between both ends.

The inner peripheral surface of the inner ring (102 in FIG. 16) of the rolling bearing has an annular groove (103 in FIG. 16 (c)) at one end of the inner peripheral surface, and an annular protrusion (FIG. 16 (c) in the other end. ) 104) is formed,
The holder (105 in FIG. 16) has a screw hole (107a in FIG. 16) for tilting on both sides of the holder parallel to the center point (M in FIG. 16 (a)) of the bearing housing (106 in FIG. 16). 107b) and inclined holes (112a and 112b in FIG. 16) are provided for pressing,

A rolling bearing formed with an annular groove and an annular protrusion is detachably accommodated in a bearing accommodating portion (106 in FIG. 16) of a holder (105 in FIG. 16), and a screw (108 in FIG. 16) and a washer (in FIG. 16). 109) and a nut (110 in FIG. 16) are engaged and fixed to the outer ring (111 in FIG. 16),

The tilt support portion (113 in FIG. 17) that allows the holder to tilt is provided with a hole (114 in FIG. 17) larger than the diameter including the coil spring of the feed screw shaft in the center, and moves parallel to the feed screw shaft. A connecting hole (115 in FIG. 17) is provided to enable connection with the guide to be engaged, and further, locking holes (116a and 116b in FIG. 17) for locking the elastic body are provided. Bolt holes (117a and 117b in FIG. 17) are provided for tilt support.

The tilting support portion (113 in FIG. 18) that can tilt the holder is provided on both sides of the holder so that there is no so-called rattling between the bolt (118 in FIG. 18), the washer (119 in FIG. 18), and the nut (120 in FIG. 18). Screwed into the screw holes (107a and 107b in FIG. 18) and supported by sliding in the tilt direction of the holder,

The elastic body (121a and 121b in FIG. 19) is inserted into the hole for elastic body (112a and 112b in FIG. 18), and is locked by the locking hole (116a and 116b in FIG. 17). At the same time that the shaft (K in FIG. 20) is inclined in the axial direction, the groove portion of the annular groove is fitted into the coil spring of the feed screw shaft (N in FIG. 20) and pressed, and the projection portion of the annular protrusion is the feed screw. Press in contact with the hollow pipe in the gap between the wire of the coil spring of the shaft and the wire (O in FIG. 20),

The connecting member (122 in FIG. 21) for connecting the inclined support part (113 in FIG. 21) and the guide moving in parallel with the axial direction of the feed screw shaft is connected via the connecting hole (115 in FIG. 17). Fixed with screws, washers, nuts, etc., and connected to the guide through pin holes (123a and 123b in FIG. 21) so that there is no so-called rattling,
The rotational motion of the feed screw shaft (K in FIG. 21) is converted into a linear motion.

  The annular protrusion of Example 3 may be, for example, a metal washer having a same inner diameter or a washer made of synthetic resin, and can be used to change the pitch of the coil spring using a spacer or the like between the annular groove. An adjustment function may be provided.

  An embodiment of claim 4 will be described.

  The feed screw shaft (P in FIG. 22) of claim 4 is a feed screw shaft in which coil springs (151 in FIG. 22) are arranged at the same pitch in the axial direction on the outer peripheral surface of the hollow pipe (150 in FIG. 22), or FIG. 24 is a feed screw device using a feed screw shaft in which a coil spring (153 in FIG. 23) is changed in pitch in the axial direction on the outer peripheral surface of a hollow pipe (152 in FIG. 23) indicated by Q in FIG.

Further, the feed screw shaft (P in FIG. 22) and the feed screw shaft (Q in FIG. 23) utilize the elastic force to return the coil spring to the inner diameter side over the entire length between both ends on the outer peripheral surface of the hollow pipe. The feed screw shaft is press-fitted.

The inner ring of the inner ring (154 in FIG. 24) of the rolling bearing has an annular groove (155 in FIG. 24 (c)) at one end of the inner ring, and a trumpet that is widened toward the other end and gently curved on the inner diameter side. The shape (156 in FIG. 24 (c)) is formed,
The holder (157 in FIG. 24) has a screw hole (159a in FIG. 24) for tilting on both sides of the holder parallel to the center point (S in FIG. 24 (a)) of the bearing housing (158 in FIG. 24). 159b) and provided with elastic holes (164a and 164b in FIG. 24) for inclining and pressing,

A rolling bearing having an annular groove and a trumpet shape is detachably accommodated in a bearing housing portion (158 in FIG. 24) of a holder (157 in FIG. 24), and a screw (160 in FIG. 24) and a washer (in FIG. 24). 161) and a nut (162 in FIG. 24) are engaged and fixed to the outer ring (163 in FIG. 24),

The tilt support portion (165 in FIG. 25) that allows the holder to tilt is provided with a hole (166 in FIG. 25) having a diameter larger than that including the coil spring of the feed screw shaft in the center, and also moves in parallel with the feed screw shaft. 25 is provided with a connecting hole (167 in FIG. 25) so that it can be connected to the guide, and further provided with locking holes (168a and 168b in FIG. 25) for locking the elastic body. Bolt holes (169a and 169b in FIG. 25) are provided for tilt support.

The tilt support portion (165 in FIG. 26) that allows the holder to tilt is provided on both sides of the holder so that there is no so-called rattling by the bolt (170 in FIG. 26), the washer (171 in FIG. 26), and the nut (172 in FIG. 26). Screwed into the screw holes (159a and 159b in FIG. 26) and supported by sliding in the tilt direction of the holder,

The elastic body (173a and 173b in FIG. 27) is passed through the holes for elastic body (164a and 164b in FIG. 26), and is locked by the locking holes (168a and 168b in FIG. 25). The feed screw shaft (P in FIG. 22) or the feed screw shaft (Q in FIG. 23) inclined in the axial direction is inclined in the axial direction, and at the same time, the groove portion of the annular groove is formed in the coil spring of the feed screw shaft. The fitting (T in FIG. 28) is pressed and the inner diameter side of the trumpet is in contact and pressed (U in FIG. 28).

The connecting member (174 in FIG. 29) for connecting the inclined support portion (165 in FIG. 29) and the guide moving in parallel with the axial direction of the feed screw shaft is connected via the connecting hole (167 in FIG. 25). Fixed with screws, washers, nuts, etc., and connected to the guide through pin holes (175a and 175b in FIG. 29) so that there is no backlash,
The rotational motion of the feed screw shaft (P in FIG. 22) having the same pitch or the feed screw shaft (Q in FIG. 23) having a pitch that varies in the axial direction is converted into a linear motion.

In the case where the pitch varies in the axial direction, the angle of the groove portion of the annular groove may be selected in accordance with the wider portion of the pitch within the axial operating range.

Regarding the reason for adopting the trumpet shape,
The pitch with a change in the axial direction of the coil spring of the feed screw shaft causes ups and downs of the groove portion of the annular groove depending on the lead angle of the coil spring. Therefore, if the cone shape of the second embodiment is used, the cone-shaped corner of the feed screw shaft is caught by the coil spring wire while the feed screw shaft is rotating. In order to solve this problem, a trumpet shape with a wide end and a gently curved inner diameter was adopted.

  An embodiment of claim 5 will be described.

  The synthetic resin described in claim 5 uses a polyacetal resin. However, the synthetic resin may be selected if it has high slidability and good mechanical properties such as wear resistance. For example, MC nylon (registered trademark) is one of the options.

The first annular groove and the second annular groove may be made of synthetic resin.
Specifically, the first annular groove (4 in FIG. 30 (b)) and the second annular groove (FIG. 30 (a) are formed on the inner peripheral surface side of the synthetic resin (200 in FIG. 30 or 200 in FIG. 30). ) Or (b) 5) formed by a plurality of screw holes (see FIG. 30) for removably inserting and fixing the synthetic resin on the inner peripheral surface of the inner ring (205 of FIG. 30B). 30 (a) 201) is provided, and is inserted into the inner peripheral surface side of the inner ring (205 of FIG. 30 (b)) of the rolling bearing, and a screw (202 of FIG. 30 (b)) and a washer (FIG. 30 (b) 203) and a nut (204 in FIG. 30B) are engaged with the inner ring (V in FIG. 30B) and fixed.

In addition, the code | symbol of the 1st annular groove 4 and the 2nd annular groove 5 used the code | symbol of Example 1 and used it.

The annular groove and the conical shape may be made of synthetic resin.
Specifically, an annular groove (53 in FIG. 31 (b)) and a conical shape (FIG. 31 (a) or (b) are formed on the inner peripheral surface side of the synthetic resin (250 in FIG. 31 (a) or (b)). ) 54) is formed with a plurality of screw holes (FIG. 31 (b) for removably inserting and fixing it on the inner peripheral surface of the inner ring (254 of FIG. 31 (b)) of the rolling bearing. 251) is inserted into the inner peripheral surface side of the inner ring of the rolling bearing (254 in FIG. 31B), and the screw (252 in FIG. 31B) and the washer (b in FIG. 31). )) 253) is engaged with the inner ring (W in FIG. 31B) and fixed.

In addition, the code | symbol of the annular groove 53 and the cone shape 54 used the code | symbol of Example 2 and used it.

The annular groove and the annular protrusion may be made of a synthetic resin.
For details, an annular groove (103 in FIG. 32 (b)) and an annular protrusion (FIG. 32 (a) or (b) are formed on the inner peripheral surface side of the synthetic resin (300 in FIG. 32 (a) or (b)). ) 104) is formed with a plurality of screw holes (FIG. 32B) for removably inserting and fixing the synthetic resin formed on the inner ring of the rolling bearing inner ring (304 of FIG. 32B). ) 301), and is inserted into the inner peripheral surface side of the inner ring (304 in FIG. 32B) of the rolling bearing, and a screw (302 in FIG. 32B) and a washer (FIG. 32B). ) 303) is engaged with the inner ring (X in FIG. 32B) and fixed.

In addition, the code | symbol of the annular groove 103 and the cyclic | annular protrusion 104 used the code | symbol of Example 3 and used it.

The annular groove and the trumpet shape may be made of synthetic resin.
For details, an annular groove (155 in FIG. 33 (b)) and a trumpet shape (FIG. 33 (a) or (b) are formed on the inner peripheral surface side of the synthetic resin (350 in FIG. 33 (a) or (b)). 156) is formed in a plurality of screw holes (FIG. 33 (b)) in order to detachably insert and fix the synthetic resin formed on the inner ring (354 of FIG. 33 (b)) of the rolling bearing. 351) and is inserted into the inner peripheral surface side of the inner ring of the rolling bearing (354 in FIG. 33B), and the screw (352 in FIG. 33B) and the washer (FIG. 33B). ) And 353) to engage with the inner ring (Y in FIG. 33B) and fix.

In addition, the code of Example 4 was used for the code | symbol of the annular groove 155 and the trumpet form 156.

  Examples common to Examples 1, 2, 3, 4 or 5 of the present invention will be described.

The tilting configuration of the holder
The holder shown in FIG. 34 (400 in FIG. 34) has an inclination shaft (in FIG. 34) for tilting on both sides of the holder parallel to the center point (Z in FIG. 34A) of the bearing housing (401 in FIG. 34). 34) 402)
The tilt support portion (403 in FIG. 35) that can be tilted is provided with tilt support holes (404 in FIG. 35) on both sides for the tilt shaft, and slides on the tilt shafts on both sides of the holder so as to prevent so-called rattling. Support

The elastic body (406 in FIG. 35) is inserted into the holes for elastic bodies on both sides (405a and 405b in FIG. 34) and fastened with stoppers (407 in FIG. 35) on both sides. At the same time as being inclined in the direction, the coil spring of the feed screw shaft is fitted and pressed with the formation formed on the inner ring of the rolling bearing of Example 1, 2, 3, 4 or 5 described above, or pressed in contact with it. In order to connect to the guide that moves parallel to the axial direction of the feed screw shaft, the screw, washer and nut are connected via a screw hole (408 in FIG. 35), and the rotational motion of the feed screw shaft is moved to a linear motion. It is good also as a structure to convert.

For the fitting of the annular groove common to Examples 1, 2, 3, or 4 of the present invention,
FIG. 36 (a) is an image view in which a feed screw shaft in which a coil spring (451 in FIG. 36 (a)) is press-fitted into a hollow pipe (450 in FIG. 36 (a)) is cut and expanded in the axial direction. 36 (b), 36 (c) and 36 (d) are cross-sectional views of the state in which the annular groove (452 in FIG. 36) of the feed screw shaft shown in the actual embodiment is fitted. It is the figure seen from the direction of AA.

FIG. 36B is a cross-sectional view taken along the line BB-BB, and a portion indicated by a point EE in FIG. 36A is in contact with the coil spring. FIG. 36C is a cross-sectional view of CC-CC. FIG. 36D is a cross-sectional view taken along DD-DD, and a portion indicated by a point FF in FIG. 36A is in contact with the coil spring.

The pitch interval of the coil springs (451 in FIG. 37 (a)) is narrow, and the groove angle (GG-GG in FIG. 37 (a)) of the annular groove (452 in FIG. 37 (a)) is reduced. Then, it becomes a so-called bite and the rotational load of the feed screw shaft increases due to friction.
Further, when the groove angle (FIG. 37 (b) HH) is increased, the probability that the annular groove is detached from the coil spring with respect to the axial external force increases.

Therefore, in order to make it possible to fit the annular groove according to claim 1, 2, 3, 4 or 5, the angle of the groove is set to 40 to 90 degrees, and (a) or (b) of FIG. II) -II is set to a predetermined interval according to the thickness and pitch of the coil spring element wire.

In this way, in particular, “allowing fitting at a pitch that varies in the axial direction” of claim 4 can be almost fitted if the angle of the annular groove is selected to be 90 degrees, for example.

  The feed screw shaft common to the first, second, third, or fourth embodiment of the present invention uses a resilient force to return the coil spring to the inner diameter side over the entire length between both ends on the outer peripheral surface of the hollow pipe. Although the fitted feed screw shaft is used, the contact portion between the hollow pipe and the coil spring may be reinforced with an adhesive for further reinforcement.

  The feed screw shaft common to the first, second, third, or fourth embodiment of the present invention uses a resilient force to return the coil spring to the inner diameter side over the entire length between both ends on the outer peripheral surface of the hollow pipe. For the purpose of further reinforcement, the contact portion between the hollow pipe and the coil spring is from one tenth of the diameter of the stiff spring wire so that the coil spring fits into the hollow pipe. A hollow groove having a depth of about three-tenths of a depth may be provided, and a coil spring may be press-fitted therein to reinforce it as a feed screw shaft.

  The feed screw shaft common to the first, second, third, and fourth embodiments of the present invention can be used as a shaft bar having a circular cross section with a uniform outer diameter in the axial direction by replacing the hollow pipe unless there is a need for weight reduction. Good.

  The holder common to Examples 1, 2, 3, or 4 of the present invention uses a polyacetal resin, but if the mechanical properties such as wear resistance are good, the synthetic resin may be selected. For example, MC nylon (registered trademark) is one of the options.

  Although the rolling bearings common to the first, second, third, and fourth embodiments of the present invention are mainly made of metal, the inner ring of the rolling bearing and the formed product on the inner ring may be made of synthetic resin. For example, a synthetic resin such as polyacetal resin may be selected if it has high slidability and good mechanical properties such as wear resistance.

  The rolling bearings common to the first, second, third, and fourth embodiments of the present invention have a structure in which a tilting hole or a tilting shaft is directly provided in the outer ring and there is a tilting support portion that supports the same unless there is a problem in performance. Also good.

DESCRIPTION OF SYMBOLS 1 Hollow pipe 2 Coil spring 3 Inner ring 4 of rolling bearing 1st annular groove 5 Second annular groove 6 Holder 7 Bearing accommodating part 8a, 8b Screw hole 9 Screw 10 Washer 11 Nut 12 Outer ring 13a, 13b of rolling bearing Elastic body hole 14 Inclined support portion 15 Hole 16 Connecting hole 17a, 17b Locking hole 18a, 18b Bolt hole 19 Bolt 20 Washer 21 Nut 22a, 22b Elastic body (here, spring wire)
23 connecting member 24a, 24b pin hole 50 hollow pipe 51 coil spring 52 inner ring 53 of rolling bearing annular groove 54 conical shape 55 holder 56 bearing housing 57a, 57b screw hole 58 screw 59 washer 60 nut 61 outer ring 62a, 62b of rolling bearing Hole for elastic body 63 Inclined support portion 64 Hole 65 Connecting hole 66a, 66b Locking hole 67a, 67b Bolt hole 68 Bolt 69 Washer 70 Nut 71a, 71b Elastic body (here, spring wire)
72 Connecting material 73a, 73b Pin hole 100 Hollow pipe 101 Coil spring 102 Inner ring 103 of rolling bearing Annular groove 104 Annular projection 105 Holder 106 Bearing housing part 107a, 107b Screw hole 108 Screw 109 Washer 110 Nut 111 Outer ring 112a, 112b of rolling bearing Hole for elastic body 113 Inclined support portion 114 Hole 115 Connecting hole 116a, 116b Locking hole 117a, 117b Bolt hole 118 Bolt 119 Washer 120 Nut 121a, 121b Elastic body (Here, it is assumed to be a spring wire)
122 connecting members 123a and 123b pin hole 150 hollow pipe 151 coil spring (same pitch in the axial direction)
152 Hollow pipe 153 Coil spring (pitch with change in the axial direction)
154 Rolling bearing inner ring 155 Annular groove 156 Trumpet type 157 Holder 158 Bearing housing portion 159a, 159b Screw hole 160 Screw 161 Washer 162 Nut 163 Rolling bearing outer ring 164a, 164b Elastic body hole 165 Inclined support portion 166 Hole 167 Connection hole 168a 168b Locking holes 169a, 169b Bolt holes 170 Bolts 171 Washers 172 Nuts 173a, 173b Elastic bodies (here, spring wires)
174 Connecting material 175a, 175b Pin hole 200 Synthetic resin in which a first annular groove and a second annular groove are formed on the inner peripheral surface side (here, a polyacetal resin)
201 Screw hole 202 Screw 203 Washer 204 Nut 205 Inner ring 250 of rolling bearing Synthetic resin in which an annular groove and a conical shape are formed on the inner peripheral surface side (here, polyacetal resin)
251 Screw hole 252 Screw 253 Washer 254 Synthetic resin (here, polyacetal resin) in which an annular groove and an annular protrusion are formed on the inner peripheral surface side of the inner ring 300 of the rolling bearing
301 Screw hole 302 Screw 303 Washer 304 Inner ring 350 of rolling bearing Synthetic resin in which an annular groove and a trumpet shape are formed on the inner peripheral surface side (here, polyacetal resin)
351 Screw hole 352 Screw 353 Washer 354 Roller bearing inner ring 400 Holder 401 Bearing housing portion 402 Inclined shaft 403 Inclined support portion 404 Inclined support holes 405a and 405b Elastic body hole 406 Elastic body (here, spring line)
407 Stopper 408 Screw hole 450 Hollow pipe 451 Coil spring 452 Annular groove

Claims (5)

The feed screw shaft has a hollow pipe with a circular cross section whose outer diameter and inner diameter are uniform in the axial direction, and an elastic force to return the coil spring to the inner diameter side over the entire length between both ends on the outer peripheral surface of the hollow pipe. The feed screw shaft press-fitted using,
A rolling bearing having a plurality of rolling elements interposed between the inner ring and the outer ring;
The inner circumferential surface of the inner ring forms a first annular groove that allows one end of the inner circumferential surface to be fitted into the coil spring, and a second annular groove that allows the other end to fit into the coil spring. And the inner diameter of the first annular groove and the second annular groove is larger than the outer diameter including the coil spring of the feed screw shaft,
The rolling bearing having the first annular groove and the second annular groove formed in the inner ring is detachably accommodated in the holder and fixed in the holder, and the holder is inclined and has an elastic body for pressing. And the holder is provided with an inclination hole or an inclination shaft so as to be inclined, and includes an inclination support portion for supporting the inclination hole or the inclination axis.
The feed screw shaft is inserted into the inner diameter side of the first annular groove and the second annular groove on the inner peripheral surface and inclined in the axial direction of the feed screw shaft;
Utilizing the elastic force of the elastic body, the coil spring element wire is pressed and fitted to the coil spring element wire at the groove part of the first annular groove, and the coil spring element is inserted into the groove part of the second annular groove at the other end. Press to fit the wire,
A feed screw device characterized by having a structure in which the pressing force at two locations inclined and fitted to the coil spring element wire is equal, and the rotational motion of the feed screw shaft is converted into a linear motion. The feed screw shaft has a hollow pipe with a circular cross section whose outer diameter and inner diameter are uniform in the axial direction, and an elastic force to return the coil spring to the inner diameter side over the entire length between both ends on the outer peripheral surface of the hollow pipe. The feed screw shaft press-fitted using,
A rolling bearing having a plurality of rolling elements interposed between the inner ring and the outer ring;
The inner peripheral surface of the inner ring has an annular groove that allows one end of the inner peripheral surface to be fitted to the coil spring, and the other side forms a conical shape that widens toward the end, and the annular groove and the conical shape The inner diameter is larger than the outer diameter including the coil spring of the feed screw shaft,
The rolling groove having the annular groove and the conical shape formed in the inner ring is detachably accommodated in the holder and fixed to the holder, and the holder is inclined and includes an elastic body for pressing, and the holder Is provided with a tilting hole or tilting shaft so as to be tiltable, and includes a tilting support portion that supports the tilting hole or tilting shaft,
The feed screw shaft is inserted into the annular groove on the inner peripheral surface and the inner diameter side of the conical shape, and is inclined in the axial direction of the feed screw shaft,
Using the elastic force of the elastic body, the groove portion of the annular groove is pressed and fitted to the coil spring element wire, and the other conical inner surface side is pressed to contact the coil spring element wire. A feed screw device characterized by converting the rotational motion of the feed screw shaft into a linear motion. The feed screw shaft has a hollow pipe with a circular cross section whose outer diameter and inner diameter are uniform in the axial direction, and an elastic force to return the coil spring to the inner diameter side over the entire length between both ends on the outer peripheral surface of the hollow pipe. The feed screw shaft press-fitted using,
A rolling bearing having a plurality of rolling elements interposed between the inner ring and the outer ring;
The inner peripheral surface of the inner ring has an annular groove that allows one end of the inner peripheral surface to be fitted to the coil spring, and the other end forms an annular protrusion on the inner diameter side, and the annular groove and the annular protrusion The inner diameter of the feed screw shaft is larger than the outer diameter including the coil spring,
The rolling bearing having the annular groove and the annular projection formed in the inner ring is detachably accommodated in the holder and fixed in the holder, and the holder is inclined and has an elastic body for pressing, and the holder Is provided with a tilting hole or tilting shaft so as to be tiltable, and includes a tilting support portion that supports the tilting hole or tilting shaft,
The feed screw shaft is inserted into the annular groove on the inner peripheral surface and the inner diameter side of the annular projection, and is inclined in the axial direction of the feed screw shaft;
Using the elastic force of the elastic body, the coil spring element wire is pressed and fitted in the groove portion of the annular groove, and the coil spring element of the feed screw shaft is connected to the other protrusion portion of the annular protrusion. A feed screw device characterized in that it is configured to press and contact the hollow pipe in the gap between the wire and the strand to convert the rotational motion of the feed screw shaft into a linear motion. The feed screw shaft has a hollow pipe with a circular cross section whose outer diameter and inner diameter are uniform in the axial direction, and an elastic force to return the coil spring to the inner diameter side over the entire length between both ends on the outer peripheral surface of the hollow pipe. The feed screw shaft press-fitted using,
A rolling bearing having a plurality of rolling elements interposed between the inner ring and the outer ring;
The inner peripheral surface of the inner ring has one end of the inner peripheral surface, an annular groove that allows the coil spring of the feed screw shaft to be fitted at a pitch that varies in the axial direction, and the other end expands toward the inner diameter side. Forms a gently curved trumpet shape, and the inner diameter of the annular groove and the trumpet shape is larger than the outer diameter including the coil spring of the feed screw shaft,
The rolling bearing formed with the annular groove and the trumpet shape on the inner ring is detachably accommodated in the holder and fixed to the holder, and the holder is inclined and has an elastic body for pressing, and the holder Is provided with a tilting hole or tilting shaft so as to be tiltable, and includes a tilting support portion that supports the tilting hole or tilting shaft,
The feed screw shaft is inserted into the annular groove on the inner peripheral surface and the inner diameter side of the trumpet type, and is inclined in the axial direction of the feed screw shaft,
Using the elastic force of the elastic body, the groove portion of the annular groove is pressed and fitted to the coil spring element wire, and the other inner surface side of the trumpet type is pressed and brought into contact with the coil spring element wire. A feed screw device characterized by converting the rotational motion of the feed screw shaft into a linear motion.   The said 1st annular groove and said 2nd annular groove of Claim 1 formed in the said internal peripheral surface of the said inner ring | wheel of the said rolling bearing, or the said annular groove and the said cone shape of Claim 2, or the Claim 3 The said annular groove and the said annular protrusion, or the said annular groove and the said trumpet shape of Claim 4 were made from the synthetic resin which can be detachably fixed to the said internal peripheral surface of the said inner ring | wheel. The feed screw device according to any one of 3 and 4.

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