Phase measuring apparatus for ball nut and measuring method usig it

Abstract

The present invention aims to provide a ball nut phase measuring device and a measuring method that, when one side of the ball nut's flange is in close contact with a reference block, measures the height difference of the target ball nut for a reference ball nut set to "0", thereby easily confirming the nut groove phase difference of the target ball nut according to the height difference of the ball nut, and thereby accurately confirming whether the nut groove and the guide passage are smoothly connected within an error range in a short time without cutting the ball nut.

Description

Technology Field

[0001] The present invention relates to a ball screw used in a conveying mechanism or a precision positioning mechanism, and more specifically, to a ball nut phase measuring device for accurately measuring whether the guide passage of an end cap fastened to both ends of the ball nut of the ball screw and the nut groove of the ball nut are smoothly connected within an error range, and a ball nut phase measuring method using the same. Background Technology

[0003] Generally, a ball screw comprises a screw shaft and a ball nut screw-coupled to the screw shaft, as described in Patent No. 10-0665409 registered with the Korean Intellectual Property Office, wherein opposing spiral screw grooves and nut grooves are formed on the outer surface of the screw shaft and the inner surface of the ball nut, and a plurality of balls are filled in the ball rolling passages formed by the screw grooves and nut grooves, and the balls are configured to circulate through ball return passages formed in the ball rolling passages and the ball nut.

[0004] At this time, end caps are fastened to both ends of the ball nut to guide the ball to move smoothly from the end point of the ball rolling passage to the ball return passage or from the ball return passage to the start point of the ball rolling passage, and the guide passage formed in the end cap connects the ball rolling passage and the ball return passage in a streamlined manner, thereby guiding the ball to change direction much more smoothly.

[0005] If the nut groove of the ball nut does not connect smoothly with the guide passage of the end cap, the ball will not be able to move smoothly from the guide passage to the ball rolling passage. Consequently, not only can precise operation not be expected, but serious problems such as loud noise and wear and damage to various parts will also occur; therefore, it is absolutely necessary to measure the phase of the nut groove of the ball nut. In other words, measuring the phase of the nut groove to ensure a smooth connection between the end point of the guide passage and the starting point of the nut groove within an acceptable margin of error guarantees the precise operation of the ball screw.

[0006] Conventional ball nut groove phase measuring devices measured the phase using an optical microscope after cutting the ball nut along the axial direction of the screw shaft; however, this method had the problem of requiring a significant amount of time and cost for cutting the ball nut and resulting in varying measurement values ​​depending on the inspector.

[0007] In addition, since ball nuts must be cut to measure the nut groove phase, mass-produced ball nuts cannot be inspected 100% and sampling inspection must be performed, which leads to an increase in the defect rate and a decrease in product reliability. Prior art literature

[0009] Republic of Korea Registered Patent No. 10-0665409 The problem to be solved

[0010] The present invention aims to solve the aforementioned problems by providing a ball nut phase measuring device and a measuring method that can easily identify the nut groove phase of a target ball nut based on the height difference by measuring the height difference of a target ball nut with respect to a reference ball nut whose height is set to "0" relative to a reference block, thereby enabling accurate verification of whether the nut groove and the guide passage are smoothly connected within an error range within a short time without cutting the ball nut. means of solving the problem

[0012] The ball nut phase measuring device of the present invention for achieving the above-mentioned purpose is,

[0013] A shelf unit configured to be movable in the forward and backward directions along a linear guide formed on the upper part, with a plate having a through hole;

[0014] A damping means wherein a fixed shaft is provided to protrude upward and downward in a through hole of the above plate, and a movable body having a nut support on its upper side moves up and down along the fixed shaft by means of an elastic restoring force;

[0015] A screw jig formed at the upper end of the fixed shaft, having screw threads formed on its outer circumference corresponding to the nut groove of a ball nut, and to which the ball nut is fastened;

[0016] A reference block spaced apart from one side of the screw jig at the upper part of the shelf and formed at a height corresponding to the nut support; and

[0017] It includes a first dial gauge for measuring the bottom surface height of a ball nut that is fastened to the above screw jig and has one side supported by a reference block;

[0018] After fastening a ball nut to a screw jig so that the bottom surface is in close contact with the nut support, the ball nut is further rotated so that one side of the flange of the ball nut faces parallel to the reference block, and the plate is moved toward the reference block to bring one side of the flange into close contact with the reference block. When the ball nut is rotated so that one side of the flange faces parallel to the reference block, a difference in the rotation radius occurs in the ball nut having a phase difference in the nut groove, and the height of the ball nut in the screw jig changes due to the difference in the rotation radius, and the phase of the ball nut is determined by measuring the height difference of the ball nut with a second dial gauge.

[0019] In addition, the present invention further includes a first dial gauge provided on the upper side of a screw jig, which measures the height of the upper surface of a ball nut by a spindle contacting the upper surface of a ball nut that is fastened to the screw jig and has one side of a flange in close contact with a reference block.

[0020] In addition, the ball nut phase measurement method of the present invention is,

[0021] A-1: A step of fastening a reference ball nut to a screw jig so that the bottom surface of the reference ball nut is in close contact with the nut support of the damping means;

[0022] A-2: A step of further rotating the reference ball nut so that one side of the flange faces parallel to the front of the reference block, and pushing the plate toward the reference block to secure the one side of the flange of the reference ball nut in close contact with the front of the reference block;

[0023] A-3: A step of setting the measurement value of the second dial gauge to "0" when one side of the flange of the reference ball nut is in close contact with the front of the reference block;

[0024] B-1: A step of fastening an arbitrary target ball nut to a screw jig from which the basic ball nut has been removed, and proceeding with the steps of A-1 and A-2 above;

[0025] B-2: Includes the step of checking the measurement value of the second dial gauge to determine the height difference of the bottom surface of the target ball nut relative to the reference ball nut, and determining the phase of the target ball nut. Effects of the invention

[0027] By using the ball nut phase measuring device of the present invention, the height difference of a target ball nut relative to a reference ball nut is measured based on a reference block, and the phase difference of the nut groove of the target ball nut caused by the height difference can be easily verified. Consequently, there is no need to cut the ball nut to measure the phase of the nut groove, and the nut groove phase of all mass-produced ball nuts can be measured in a short time, thereby having the effect of significantly reducing the defect rate, measurement costs, and measurement time. Brief explanation of the drawing

[0029] FIG. 1 is a schematic diagram showing the overall appearance of the ball nut phase measuring device of the present invention. FIGS. 2 to 4 are usage diagrams for measuring the ball nut phase of a basic ball nut using the ball nut phase measuring device of the present invention. FIGS. 5 and 6 are usage diagrams for measuring the phase of a target ball nut using the ball nut phase measuring device of the present invention. FIGS. 7 and 8 are combined diagrams of a screw jig, a plate, and a damping means applied to the present invention, and a state diagram in which a ball nut is coupled to the screw jig. FIG. 9 is an operation diagram of a damping means by a ball nut applied to the present invention. FIG. 10 is a usage state diagram showing the measured value of a target ball nut using the ball nut phase measuring device of the present invention. Specific details for implementing the invention

[0030] The embodiments described below are intended to provide a detailed description sufficient for a person skilled in the art to easily practice the invention, and do not imply that the technical scope and concept of the invention are limited thereby.

[0031] In addition, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation, and terms specifically defined in consideration of the configuration and operation of the present invention may vary according to the intent or convention of the user or operator, and it should be noted that the definitions of such terms must be based on the content throughout this specification.

[0033] FIG. 1 is a schematic diagram showing the overall appearance of the ball nut phase measuring device of the present invention, FIG. 2 to 4 are process diagrams showing the step of measuring the phase of a basic ball nut using the ball nut phase measuring device of the present invention, FIG. 5 and 6 are process diagrams showing the step of measuring the phase of a target ball nut using the ball nut phase measuring device of the present invention, FIG. 7 and 8 are diagrams showing the combination of a screw jig, a plate, and a damping means applied to the present invention and the state in which a ball nut is coupled to the screw jig, FIG. 9 is an operation diagram of the damping means applied to the present invention, and FIG. 10 is a usage state diagram showing the measured value of a target ball nut using the ball nut phase measuring device of the present invention.

[0034] A ball nut phase measuring device (100) according to the present invention comprises: a shelf (170) configured to be movable in the forward and backward directions along a linear guide (171) formed on the upper part of a plate (160) having a through hole (160a); a damping means (180) configured such that a fixed shaft (181) protrudes upward and downward from the through hole (160a) of the plate (160), and a movable body (183) having a nut support part (183a) on the upper part moves up and down along the fixed shaft (181) by means of an elastic restoring force; and a screw jig (130) formed on the upper end of the fixed shaft (181), having a screw thread corresponding to the nut groove of the ball nut (10, 20) formed on the outer circumference, and to which the ball nut (10, 20) is fastened. It includes: a reference block (140) spaced apart from one side of the screw jig (130) at the upper part of the shelf (170) and formed at a height corresponding to the nut support part (183a); and a second dial gauge (120) for measuring the bottom surface height of a ball nut (10, 20) that is fastened to the screw jig (130) and supported by the nut support part (183a).

[0035] Additionally, the present invention further includes a first dial gauge (110) which is provided on the upper side of the screw jig (130) and fastened to the screw jig (130), and measures the height of the upper surface of the ball nut (10, 20) by having a spindle contact the upper surface of the ball nut (10, 20) such that one side (11, 21) of the flange is in close contact with the reference block (140).

[0036] Additionally, the ball nut phase measuring device of the present invention fastens the ball nut (10, 20) to the screw jig (130) so that the bottom surface is in close contact with the nut support part (183a), then further rotates the ball nut (10, 20) so that one side of the flange (11, 21) of the ball nut (10, 20) faces parallel to the reference block (140), moves the plate (160) toward the reference block (140) to bring one side of the flange (11, 21) into close contact with the reference block (140), and when the one side of the flange (11, 21) is rotated to face parallel to the reference block (140), a difference in the radius of rotation occurs due to the phase difference of the nut groove of the ball nut (10, 20), and the height of the ball nut (10, 20) in close contact with the reference block (140) changes due to the difference in the radius of rotation, and the height difference of the ball nut (10, 20) is a first dial The phase of the ball nut (10, 20) is determined by measuring with a gauge (110) and / or a second dial gauge (120).

[0037] The ball nut phase measuring device (100) of the present invention measures the height of the reference ball nut (10) when one side of the flange (11) of the reference ball nut (10) is in contact with the reference block (140) to set the reference point or zero point of the dial gauge (110, 120), and measures the height of any target ball nut (20) when one side of the flange (21) is in contact with the reference block (140) in the same way as the reference ball nut (10), and then compares it with the measured value of the reference ball nut (10) so that the phase of the target ball nut (20) can be easily identified through the difference in the measured value of the target ball nut (20) with respect to the reference ball nut (10). As a result, the phase of multiple target ball nuts (20) can be easily and quickly identified without cutting the ball nut (20), and rapid response and recovery according to the phase difference is possible, thereby maximizing production volume.

[0038] As illustrated in FIGS. 1 to 9, the ball nut phase measuring device (100) of the present invention comprises: a shelf (170) configured to be movable in the forward and backward directions along a linear guide (171) formed on the upper part of a plate (160) having a through hole (160a); a damping means (180) configured such that a fixed shaft (181) protrudes upward and downward from the through hole (160a) of the plate (160), and a movable body (183) having a nut support part (183a) on the upper part moves up and down along the fixed shaft (181) by means of an elastic restoring force; and a screw jig (130) formed on the upper end of the fixed shaft (181), having screw threads corresponding to the nut groove of the ball nut (10, 20) formed on the outer circumference, and to which the ball nut (10, 20) is fastened. It includes: a reference block (140) spaced apart from one side of the screw jig (130) at the upper part of the shelf (170) and formed at a height corresponding to the nut support part (183a); and a second dial gauge (120) for measuring the bottom surface height of a ball nut (10, 20) that is fastened to the screw jig (130) and supported by the nut support part (183a).

[0039] The above shelf (170) is in the form of a workbench having a predetermined height, and a rail-shaped linear guide (171) is formed on the upper part, and a plate (160) is movably connected to the linear guide (171), and the plate (160) moves in the forward and backward directions along the linear guide (171) on the upper part of the shelf (170). Additionally, height adjustment pads are provided on the legs of the shelf (170).

[0040] A locking lever (161) for preventing movement of the plate (160) is provided on the left and / or right side of the plate (160). That is, after pushing the plate (160) toward the reference block (140) so that one side of the flange (11, 21) of the ball nut (10, 20) comes into close contact with the reference block (140), the locking lever (161) can be turned in the locking direction to fix the plate (160) so that it does not move from the upper part of the shelf (170).

[0041] The above locking lever (161) can be lowered to the linear guide (171) by rotation and fastened to a fastening hole formed at a certain interval in the linear guide (171), and the plate (160) can be fixed by pressing the linear guide.

[0042] The above screw jig (130) is fixed by fastening a ball nut (10, 20), is formed to a predetermined length, has screw threads formed on its outer circumference corresponding to the nut groove of the ball nut (10, 20), and fastens the ball nut (10, 20) by descending from the top by rotation in a screw-fastening manner.

[0043] The screw jig (130) is fixed by being coupled with a fixing shaft (181) on the upper side of a plate (160) which is provided to be movable in the forward and backward directions on the upper side of a shelf (170). A hollow groove (131) is formed in the longitudinal direction inside the screw jig (130), and the fixing shaft (181) is inserted into the hollow groove (131) and fastened with a bolt (B), thereby fixing the screw jig (130) to the upper side of the plate (160).

[0044] And on the shelf (170), a reference block (140) and a support rod (150) are provided, with the front surface facing the screw jig (130) formed with a predetermined area, and the reference block (140) is formed at a height corresponding to the height of the screw jig (130) or the nut support part (183a), and the support rod (150) is positioned at the rear side of the reference block (140).

[0045] The above reference block (140) comprises: a block body formed at a predetermined height on the upper part of the shelf (170) and having a through groove in the front and rear directions inside; a support body in which the flange (11, 21) of a ball nut (10, 20) is in close contact with the front surface and the rear end is movably inserted into the through groove; and a locking lever (143) formed on the side of the block body and which presses the support body inside the through groove by rotation to suppress the movement of the support body. That is, the locking lever (143) can be rotated in the unlocking direction and the support body can be moved in the front and rear directions to set the position of the support body, and then the locking lever (143) can be rotated in the locking direction to fix the support body.

[0046] A first dial gauge (110) is mounted on the above support rod (150) by a position adjustment means (151).

[0047] The dial gauge (110, 120) is a gear device that amplifies the amount of displacement through a spindle using a rack and pinion and a gear train. It is an instrument that precisely measures length or displacement by amplifying minute displacements, and is particularly used to inspect small errors such as unevenness of a flat surface, suitability of workpiece assembly, and runout of the shaft center.

[0048] The first dial gauge (110) is installed so as to be movable in the up and down directions and in the front and back directions by means of a position adjustment means (151) on a support rod (150).

[0049] The above position adjustment means (151) is fitted onto a support rod (150) and fixed by a first adjustment screw (151a), and at least two fixing bars (151c) connecting the first dial gauge (110) and the support rod (150) in the forward and backward directions are fixed by a second adjustment screw (151b), and the height of the first dial gauge (110) is adjusted by loosening the first adjustment screw (151a), and the first dial gauge (110) can be moved in the forward and backward directions by loosening the second adjustment screw (151b).

[0050] That is, when moving the first dial gauge (110) up and down, the first adjustment screw (151a) is loosened to adjust the height along the support rod (150), and then the first adjustment screw (151a) is tightened to fix it. When moving the first dial gauge (110) forward and backward, the second adjustment screw (151b) is loosened to move the position adjustment means (151) forward or backward along the fixing bar (151c), and then the second adjustment screw (151b) is tightened.

[0051] Additionally, a second dial gauge (120) is provided on the lower side of the plate (160) to measure the height of the bottom surface of the flange (11, 21) of the ball nut (10, 20) or the bottom surface of the flange groove (12, 22) formed inside the flange (11, 21).

[0052] Since the starting point of the nut groove is located on the upper surface of the ball nut (10, 20) and the ending point of the nut groove is formed on the bottom surface of the flange groove (12, 22) formed inside the flange (11, 21) of the ball nut (10, 20), the present invention allows the upper surface height of the ball nut (10, 20) located on the screw jig (130) relative to the reference block (140) to be measured using the first dial gauge (110), and the bottom surface height of the ball nut (10, 20) to be measured using the second dial gauge, thereby making it easy to check the phase difference of the ball nut (10, 20) according to the height difference of the ball nut (10, 20) on the screw jig (130).

[0053] The first dial gauge (110) and the second dial gauge (120) can be arranged symmetrically above and below the screw jig (130).

[0054] In addition, the present invention includes a damping means (180) that moves up and down by elastic restoring force according to the downward pressure of the ball nut (10, 20) at the lower part of the screw jig (130), and contacts the spindle of the second dial gauge (120).

[0055] As illustrated in FIGS. 7 to 9, the damping means (180) comprises: a fixed shaft (181) of a predetermined length, the upper end of which is inserted into a hollow groove (131) inside a screw jig (130) and coupled to the screw jig (130) by a bolt (B), and the lower end of which passes through a through hole formed in a plate (160) and protrudes to the lower side of the plate (160); a first support plate (182a) connected to the lower end of the fixed shaft (181) and fixed to the lower side of the plate (160) by at least one first connecting bar (185a); and an elastic spring (184) fitted onto the fixed shaft (181) and seated on the upper part of the first support plate (182a). A movable body (183) is connected to the fixed shaft (181) so as to be movable up and down, and has a nut support part (183a) formed on the upper part protruding upward from the plate (160) to be inserted into the flange groove (12, 22) of the ball nut (10, 20) and to support the lower part of the ball nut (10, 20), and has a lower part protruding downward from the plate (160) seated on the upper part of the elastic spring (184), and descends along the fixed shaft (181) by the downward pressure of the ball nut (10, 20) to press the elastic spring (184) or returns to its original position by the elastic restoring force of the elastic spring (184), and has a plate-shaped measuring part (183b) on one side to which the spindle of the second dial gauge (120) contacts.

[0056] Additionally, the damping means (180) further includes: a protrusion (181a) that extends from the lower part of the fixed shaft (181) and protrudes downward from the first support plate (182a) by penetrating the first support plate (182a); and a second support plate (182b) that is positioned downward from the first support plate (182a), is connected to the movable body (183) by at least one second connecting bar (185b) penetrating the first support plate (182a), moves integrally with the movable body (183), and has a central portion connected to the protrusion (181a).

[0057] When fastening the ball nut (10, 20) to the screw jig (130), the nut support portion (183a) of the movable body (183) supports the flange of the ball nut (10, 20) or is inserted into the flange groove (12, 22) of the ball nut (10, 20) to support the bottom surface. At this time, the height of the nut support portion (183a) may be formed to be equal to or higher than the height of the reference block (140).

[0058] After fastening the ball nut (10, 20) to the screw jig (130) so that the bottom surface of the ball nut (10, 20) is in close contact with the nut support part (183a), the ball nut (10, 20) is further rotated in the fastening or loosening direction so that one side of the flange (11, 21) of the ball nut (10, 20) faces parallel to the reference block (140), and while the one side of the flange (11, 21) and the front of the reference block (140) are in close contact, the plate (160) is moved toward the reference block (140) to bring the one side of the flange (11, 21) into close contact with the reference block (140). Here, when one side of the flange (11, 21) is rotated to face parallel to the reference block (140), if the nut groove phase of the ball nut (10, 20) is different, a difference in the rotation radius occurs, and due to the difference in the rotation radius, the height of the ball nut (10, 20) in the screw jig (130) changes, and the difference in the height of the ball nut (10, 20) can be easily determined by measuring the first dial gauge (110) and / or the second dial gauge (120).

[0059] When fastening the ball nut (10, 20) to the screw jig (130), the nut support part (183a) of the movable body (183) is inserted into the flange groove (12, 22) of the ball nut (10, 20) and the nut support part (183a) is in close contact with the bottom surface of the ball nut (10, 20). At this time, one side of the flange (11, 21) of the ball nut (10, 20) may be positioned diagonally or facing the reference block (140). If positioned diagonally, the ball nut (10, 20) is further rotated so that one side of the flange (11) faces parallel to the front of the reference block (140). At this time, if the bottom surface of the ball nut (10, 20) is in close contact with the nut support (183a) and rotates further, the ball nut (10, 20) may rise or fall further along the screw jig (130), and if it falls, it presses the nut support (183a) so that the height of the measuring part (183b) also decreases.

[0060] That is, as the flange (11) of the ball nut (10, 20) descends to the height of the reference block (140), the nut support part (183a) is pressed, causing the movable body (183) to descend, and as the movable body (183) descends, the spindle of the second dial gauge (120) comes into contact with the measuring part (183b) of the movable body (183). Then, when the flange (11, 21) of the ball nut (10, 20) is fixed in close contact with the front of the reference block (140), the descent of the movable body (183) also stops, and at this time, the height of the upper surface or / and bottom surface of the ball nut can be measured using the first dial gauge (110) or / and the second dial gauge (120).

[0061] The measuring part (183b) of the damping means (180) is positioned at the leading edge of the plate (160), and the second dial gauge (120) is positioned below the measuring part (183b) by a fixed frame (121).

[0062] The above measuring part (183b) may be formed in the shape of a plate or an "L" and may be formed integrally with the lower part of the damping means (180) or detachably coupled to the damping means (180).

[0063] The above fixed frame (121) is formed in a "∪" shape, and a second dial gauge (120) is connected to the central part. Long holes (121a) are formed at both ends through which bolts (B) pass to be fastened to the plate (160), and the height of the second dial gauge (120) can be adjusted by the position of the bolts (B) fastened to the long holes (121a).

[0064] Additionally, the present invention comprises: a screw jig (130) to which a ball nut (10, 20) is fastened; a reference block (140) spaced apart from one side of the screw jig (130) and formed at a height corresponding to one side of the screw jig (130), wherein when the ball nut (10, 20) is fastened to the screw jig (130), the flange (11, 21) of the ball nut (10, 20) is fastened at a height facing the front, and then one side of the flange (11, 21) is in close contact with the front; and a first dial gauge (110) that measures the height of the upper surface of the ball nut (10, 20) in contact with the reference block (140) by a spindle contacting the upper surface of the ball nut (10, 20) supported by the reference block (140).

[0065] The reference ball nut (10) is fastened to the screw jig (130), one side of the flange (11) is pressed against the reference block (140), and the measurement value of the first dial gauge (110) is set to "0".

[0066] Then, by fastening an arbitrary target ball nut (20) to the screw jig (130) and bringing one side of the flange (21) into close contact with the reference block (140), the phase of the nut groove of the target ball nut (20) can be determined by checking the measurement value of the first dial gauge (110).

[0068] In order to measure the phase of a ball nut using the present invention configured as described above, as shown in FIGS. 2 and 4, first, a reference ball nut (10) is fastened to a screw jig (130), and a nut support part (183a) is supported on the bottom surface of the flange groove (12) of the reference ball nut (10). Then, the reference ball nut (10) is further rotated so that one side of the flange (11) faces the reference block (140). When the one side of the flange (11) of the reference ball nut (10) faces the reference block (140), a plate (160) is pushed toward the reference block (140) so that the one side of the flange (11) of the reference ball nut (10) is in close contact with and supported on the front surface of the reference block (140). At this time, when the reference ball nut (10) is rotated further at a predetermined angle while the bottom surface is in close contact with the nut support part (183a), it lowers the movable body (183) by pressing the nut support part (183a) and lowers it further to a predetermined height.

[0069] When one side of the flange (11) of the reference ball nut (10) is fixed by being in close contact with the front of the reference block (140) by rotation, the plate (160) is fixed using the locking lever (161), and the spindle of the first dial gauge (110) is brought into contact with one side of the upper surface of the reference ball nut (10) where the starting point of the nut groove is formed, and then the measurement value of the first dial gauge (110) is set to "0". In addition, in this state, the measurement value of the second dial gauge (120), where the spindle comes into contact with the measuring part (183b) of the damping means (180), is also set to "0".

[0070] Then, as shown in FIGS. 5 and 6, the reference ball nut (10) is separated from the screw jig (130), and the target ball nut (20) to be checked is fastened to the screw jig (130). Then, the target ball nut (20) is brought into close contact with one side of the flange (21) of the target ball nut (20) to the reference block (140) in the same way as the measurement method of the reference ball nut (10), and the spindle of the first dial gauge (110) is brought into contact with the upper surface of the target ball nut (20) to check the measurement value output from the first dial gauge (110) and the measurement value of the second dial gauge (120).

[0071] That is, based on the measurement value of the reference ball nut (10), the height difference of the target ball nut (20) can be easily checked through the first dial gauge (110) and / or the second dial gauge (120), and if the measurement value of the target ball nut (20) is not "0", which is the measurement value of the reference ball nut (10), the deviation of the phase of the target ball nut (20) due to the error according to the measurement value can be easily identified.

[0072] The above second dial gauge (120) can measure the height of the bottom surface of the flange (11, 21) of the ball nut (10, 20) or the bottom surface inside the flange groove (12) when the flange (11, 21) of the ball nut (10, 20) fastened to the screw jig (130) is in close contact with the reference block (140). When the reference ball nut (10) is fastened to the screw jig (130), the nut support part (183a) of the movable body (183) is inserted into the flange groove (12) of the reference ball nut (10), causing the bottom surface of the reference ball nut (10) and the nut support part (183a) to be in close contact and stop rotation. Subsequently, the reference ball nut (10) is forcibly rotated further so that one side of the flange of the reference ball nut (10) faces the reference block (140), and as a result, the nut support part (183a) is pressed, and the movable body (183) It descends to a predetermined height, and as the movable body (183) descends, the spindle of the second dial gauge (120) comes into contact with the measuring part (183b) of the movable body (183). Then, when the flange (11) of the reference ball nut (10) is fixed in close contact with the front of the reference block (140), the descent of the movable body (183) also stops, and at this time, the measurement value of the second dial gauge (120) of the reference ball nut (10) is set to "0".

[0073] When the bottom surface height of the reference ball nut (10) is set to the measurement value "0" of the second dial gauge (120), a new target ball nut (20) is fastened to the screw jig (130), and when one side of the flange (21) of the target ball nut (20) is in close contact with the reference block (140), the measurement value of the second dial gauge (120) is checked, and if the measurement value is not "0", the misalignment of the nut groove phase of the target ball nut (20) can be identified.

[0074] Accordingly, the present invention allows the nut groove phase of a target ball nut (20) to be determined by checking the measurement values ​​of the first dial gauge (110) and / or the second dial gauge (120) when a reference ball nut (10) is fastened to a screw jig (130) and one side of the flange (11) of the reference ball nut (10) is in close contact with a reference block (140), and then when an arbitrary target ball nut (20) is fastened to a screw jig (130) in the same manner as the reference ball nut (10) and one side of the flange (21) is in close contact with a reference block (140).

[0075] Next, FIG. 10 compares the measured values ​​of a reference ball nut (10) and a target ball nut (20) using a ball nut phase measuring device (100) according to the present invention.

[0076] In FIG. 10, (A) shows the first dial gauge (110) and the second dial gauge (120) of the reference ball nut (10) set to "0", and (B) shows the first dial gauge (110) and the second dial gauge (120) of the target ball nut (20).

[0077] In (B) of FIG. 10, the measurement value of the first dial gauge (110) of the target ball nut (20) is "+0.21", which means that the upper surface height of the reference ball nut (10) has risen by "0.21", and the measurement value of the second dial gauge (120) is "-0.21", which means that the bottom surface height has risen by "0.21" compared to the reference ball nut (10), and thus the phase of the target ball nut (20) is deviated by a value of "0.21" from the phase of the reference ball nut (10).

[0078] In addition, in (B) of FIG. 10, it can be seen that the magnitudes of the first dial gauge (110) and the second dial gauge (120) of the target ball nut (20) are the same, and only the signs are different. If the magnitudes of the first dial gauge (110) and the second dial gauge (120) are different, it can be determined that the overall length of the target ball nut (20) is different from that of the reference ball nut (10).

[0080] Next, a method for measuring the phase of a ball nut (10, 20) using the ball nut phase measuring device (100) of the present invention will be described.

[0081] A. First, the measurement values ​​of the first dial gauge (110) and / or the second dial gauge (120) of the reference ball nut (10) are each set to "0".

[0082] To this end, A-1. A reference ball nut (10) is fastened to a screw jig (130), such that the bottom surface of the reference ball nut (10) is in close contact with the nut support portion (183a) of the damping means (180).

[0083] When the screw jig (130) is separated from the fixed shaft (181), the screw jig (130) is fitted onto the upper part of the fixed shaft (181), and the screw jig (130) and the fixed shaft (181) are joined by fastening a bolt (B) to the upper part of the screw jig (130) (A-0).

[0084] A-2. With the bottom surface of the reference ball nut (10) in close contact with the nut support portion (183a) of the damping means (180), the reference ball nut (10) is rotated further at a predetermined angle so that one side of the flange (11) of the reference ball nut (10) faces parallel to the front of the reference block (140), and the plate (160) is pushed toward the reference block (140) to fix the one side of the flange (11) of the reference ball nut (10) in close contact with the front of the reference block (140).

[0085] Before pushing the plate (160) toward the reference block (140), the indicator of the first dial gauge (110) is pressed to raise the spindle, and when the plate (160) is pushed and the flange (11, 21) of the base ball nut (10) comes into close contact with the reference block (140), the locking levers (161, 143) of the plate (160) and the reference block (140) are turned in the locking direction to fix the plate (160) and the reference block (140) so that they do not move.

[0086] The position of the first dial gauge (110) is adjusted and fixed so that the spindle of the first dial gauge (110) is positioned above the reference ball nut (10) through the position adjustment means (151), and the position of the second dial gauge (120) is also adjusted and fixed through a bolt (B) fastened to the fixed frame (121).

[0087] A-3. When the flange (11) of the reference ball nut (10) is in close contact with the reference block (140), the measurement value of the second dial gauge (120), in which the spindle is in contact with the measuring part (183b), is set to "0".

[0088] A-4. Then, the spindle of the first dial gauge (110) is brought into contact with the upper surface of the base ball nut (10), and the measurement value of the first dial gauge (110) is set to "0".

[0090] B. When the measurement value of the reference ball nut (10) is set to "0", the reference ball nut (10) is removed from the screw jig (130), and any target ball nut (20) for which the phase difference is to be checked is attached to the screw jig (130).

[0091] B-1. Then, steps A-1 and A-2a of the reference ball nut (10) are performed in the same way.

[0092] B-2. Check the measurement value of the second dial gauge (120) in contact with the measuring part (183b) of the damping means (180) to determine the deviation of the nut groove phase of the target ball nut (20).

[0093] B-3. ​​Then, the spindle of the first dial gauge (110) is brought into contact with the upper surface of the target ball nut (20), and the phase difference of the target ball nut (20) is checked by verifying the measurement value output from the first dial gauge (110).

[0094] The method for measuring the phase of a ball nut (10, 20) using the ball nut phase measuring device (100) of the present invention can determine the phase difference of the ball nut (10, 20) by using only one of the first dial gauge (110) and the second dial gauge (120).

[0096] Although the present invention has been described in relation to the preferred embodiments mentioned above, it will be readily apparent to a person skilled in the art that various modifications and variations are possible without departing from the essence and scope of the invention, and that all such changes and modifications fall within the scope of the appended claims. Explanation of the symbols

[0098] 10 : Standard ball nut 20 : Target ball nut 11,21 : Flange 12,22 : Flange groove 100: Ball nut phase measuring device 110: First dial gauge 120: Second dial gauge 130: Screw jig 140 : Reference block 150 : Support pole 160 : Plate 170 : Shelf 180: Damping means 181: Fixed shaft 182a: First support plate 182b: Second support plate 183: Moving body 183a: Nut support 183b : Measuring part 184 : Elastic spring

Claims

Claim 1 A shelf (170) having a plate (160) having a through hole (160a) and configured to be movable in the forward and backward directions along a linear guide (171); a damping means (180) having a fixed shaft (181) protruding vertically from the through hole (160a) of the plate (160), and a movable body (183) having a nut support part (183a) on its upper side, which moves up and down along the fixed shaft (181) by means of an elastic restoring force; a screw jig (130) formed at the upper end of the fixed shaft (181) and having a screw thread corresponding to the nut groove of the ball nut (10, 20) formed so that the ball nut (10, 20) is fastened; and a reference block (140) provided spaced apart from one side of the screw jig (130) on the shelf (170) and formed at a height corresponding to the nut support part (183a). A ball nut phase measuring device comprising: a second dial gauge (120) that measures the height of the bottom surface of a ball nut (10, 20) which is fastened to the screw jig (130) and has one side of the flange (11, 21) facing parallel to the reference block (140); wherein the damping means (180) comprises: a first support plate (182a) which is fixed to the lower side of the plate (160) by a first connecting bar (185a) and to which the lower end of the fixed shaft (181) is connected to fix the fixed shaft (181); and an elastic spring (184) which is fastened to the fixed shaft (181) and is disposed between the movable body (183) and the first support plate (182a) to support the movable body (183). Claim 2 A ball nut phase measuring device characterized by, in claim 1, fastening the ball nut (10, 20) to the screw jig (130) so that the bottom surface is in close contact with the nut support part (183a), then further rotating the ball nut (10, 20) so that one side of the flange (11, 21) of the ball nut (10, 20) faces parallel to the reference block (140), moving the plate (160) toward the reference block (140) to bring one side of the flange (11, 21) into close contact with the reference block (140), and when the one side of the flange (11, 21) is rotated to face parallel to the reference block (140), measuring the height difference of the ball nut (10, 20) fastened to the screw jig (130) by the difference in rotation radius with the second dial gauge (120) to determine the phase of the ball nut (10, 20). Claim 3 A ball nut phase measuring device characterized in that, in claim 1 or 2, when a reference ball nut (10) is fastened to a screw jig (130) and one side of the flange (11) of the reference ball nut (10) faces a reference block (140) at the same height, the measurement value of the second dial gauge (120) is set to "0", and when an arbitrary target ball nut (20) is fastened to the screw jig (130) in the same way as the reference ball nut (10) and one side of the flange (21) faces a reference block (140), the measurement value of the second dial gauge (120) is checked to determine the nut groove phase of the target ball nut (20). Claim 4 A ball nut phase measuring device characterized by including, in claim 1, a second dial gauge (120) connected to the central part, an elongated hole (121a) formed at both ends through which a bolt (B) fastened to a plate (160) passes, and a fixed frame (121) in the shape of a "∪" that allows the position of the second dial gauge (120) to be adjusted by fastening the bolt (B). Claim 5 A ball nut phase measuring device according to claim 1, wherein the damping means (180) comprises: a protrusion (181a) extending from the lower part of a fixed shaft (181) and penetrating a first support plate (182a) to protrude downward from the first support plate (182a); and a second support plate (182b) disposed downward from the first support plate (182a), connected to a movable body (183) by at least one second connecting bar (185b) penetrating the first support plate (182a) to move integrally with the movable body (183), and having a central part connected to the protrusion (181a) so as to be movable up and down. Claim 6 In claim 5, the movable body (183) is characterized in that a nut support portion (183a) protruding upward from the plate (160) is inserted into the flange groove (12, 22) of a ball nut (10, 20) that is fastened to the screw jig (130) to support the bottom surface of the flange groove (12, 22), and a lower portion protruding downward from the plate (160) is seated on the upper portion of the elastic spring (184), and while pressing the elastic spring (184) by the downward pressure of the ball nut (10, 20), it descends along the fixed axis (181) or returns to its original position by the elastic restoring force, and a plate-shaped measuring portion (183b) is formed on one side to which the spindle of the second dial gauge (120) contacts. Claim 7 delete

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