Fixture for measuring and adjusting bearing rotational torque

Abstract

The present invention discloses a fixture for pre-measuring the rotational torque of a bearing. The present invention comprises a fixture for pre-measuring rotational torque that implements constraint conditions of a drive unit housing and a shaft, intended for controlling bearing preload in a standalone state simulating an actual assembly environment. Accordingly, reliable rotational torque data is secured in advance in the standalone state before the bearing is assembled to the rotary drive unit. By utilizing this data, torque changes resulting from the application of a shim are immediately fed back, enabling the setting of the preload through the derivation of an optimal shim thickness, thereby maximizing the satisfaction of rotational performance of the rotary drive unit during final assembly.

Description

Technology Field

[0001] The present invention relates to a technology for pre-measuring and adjusting the rotational torque of a bearing applied to a rotary drive unit of a precision optical instrument, and more specifically, to a fixing device for measuring and adjusting the rotational torque of a bearing that applies conditions identical to the actual assembly environment before assembly to a pre-loaded bearing assembled to a precision rotary drive unit such as a gimbal, and thereby measures and adjusts the rotational torque accordingly. Background Technology

[0003] Generally, precision optical devices mounted on mission platforms such as ships, aircraft, and satellites receive light from a surveillance area and display images of the surveillance area in various ways. In the rotary drive unit (e.g., gimbal) of the optical device, a bearing for preload control is applied to increase positioning accuracy in the direction perpendicular to the axis and the direction parallel to the axis, while simultaneously suppressing axis shaking.

[0004] That is, as shown in the attached FIGS. 1 and 2, the bearing (1) for preload control applied to the rotary drive unit is first assembled on the shaft by mounting it on the mounting part (3) formed in the housing (e.g., gimbal) (2) of the rotary drive unit after checking the specifications, and then assembled with the retainer assembly fixture (4), etc., and then rotated the shaft in the assembled state to measure the rotational torque of the bearing (1) through a torque gauge (6) connected by an adapter (5). If the measured rotational torque of the bearing (1) deviates from the design standard value due to excessive preload, etc., the assembled mechanism is disassembled again and adjusted by applying a shim of appropriate thickness between the bearings (1), and the above process is repeated 1 to 3 times until the rotational torque of the bearing (1) satisfies the standard value. This is because it is a key factor in determining the bandwidth satisfaction and the elimination of image shaking of the product.

[0005] However, the measurement and adjustment of the rotational torque of the bearing (1) as described above is performed by using a bearing with a normal preload range to match the rotational torque in the process, because bearings with a precise preload are very expensive and difficult to supply.

[0006] In addition, since the torque measurement and adjustment of the bearing (1) as described above is performed by measuring the torque using a torque gauge (6) after assembling the bearing (1) into the housing (2) of the rotational drive unit, the measurement and adjustment process is inevitably inefficient as it involves repeating the process of disassembling, applying a shim, and reassembling it when the value exceeds the reference value.

[0007] In addition, measuring and adjusting the rotational torque of the bearing (1) as described above had a problem in that a huge loss of manpower occurred because there was a risk of damage during the process when the disassembly and assembly of the bearing (1) was difficult due to the structure of the rotational drive unit. Prior art literature

[0009] Registered Patent Publication No. 10-1516702 (Published May 4, 2015) Registered Patent Publication No. 10-2054875 (Published Dec. 12, 2019) Registered Patent Publication No. 10-2259802 (Published June 2, 2021) Registered Patent Publication No. 10-2268099 (Published June 22, 2021) Registered Patent Publication No. 10-2472291 (Published Nov. 30, 2022) The problem to be solved

[0010] The problem that the present invention aims to solve is to provide a fixing device for measuring and adjusting rotational torque of a bearing, which implements constraint conditions of a drive unit housing and a shaft for bearing preload control in a standalone state simulating an actual assembly environment. By configuring the fixing device for measuring and adjusting rotational torque, the invention enables reliable rotational torque data to be secured in advance in the standalone state before assembling the bearing to a rotary drive unit, and by utilizing this data to receive immediate feedback on torque changes resulting from shim application, it allows for the setting of preload by deriving the optimal shim thickness, thereby maximizing the satisfaction of rotational performance of the rotary drive unit during final assembly. means of solving the problem

[0012] The fixing device for measuring and adjusting the rotational torque of a bearing, which is a means for solving the problem of the present invention, is fixed to pre-measure and adjust the rotational torque of a bearing using a torque gauge connected by an adapter while a preload is applied before assembly to an actual rotational drive part of an optical device, and comprises: a bearing inner ring mounting part on which the bearing is mounted; a bearing inner ring retainer disposed on the upper end of the bearing mounted on the bearing inner ring mounting part and forming an assembly with the bearing inner ring mounting part on which the bearing is mounted according to the fastening of a first screw; a fixing body having an assembly mounting hole formed therein on which an assembly formed by the assembly of the bearing, the bearing inner ring mounting part, and the bearing inner ring retainer is seated; and a bearing outer ring retainer coupled and fixed to the fixing body through a second screw at the upper end of the fixing body.

[0013] Additionally, the bearing inner ring mounting portion is a ring-shaped structure comprising: a flange portion that supports the lower end of the bearing and is engaged within the assembly mounting portion; and a bearing inner ring support portion formed to extend to a predetermined height from one side of the flange portion and on which the bearing is mounted; and a plurality of first fastening portions for fastening the first screw are formed in the bearing inner ring support portion.

[0014] In addition, a plurality of first removal holes are formed in the flange portion to guide the removal of the bearing from the inner ring support portion of the bearing when re-measuring after shim application.

[0015] In addition, the first removal hole is a structure of four semicircular grooves maintaining a predetermined spacing.

[0016] In addition, the bearing inner ring retainer is a ring-shaped structure facing the first fastener and having a plurality of second fasteners formed therein for fastening the first screw.

[0017] In addition, a plurality of third fastening holes are formed at an adjacent position to the assembly mounting hole formed in the center of the fixed body, to which the second screw is fastened, and the bearing outer ring retainer is a ring-shaped structure facing the third fastening holes, to which a plurality of fourth fastening holes are formed for fastening the second screw.

[0018] In addition, a plurality of second removal holes are formed inside the assembly mounting hole formed in the center of the fixed body to guide the removal of the assembly when re-measuring after shim application.

[0019] In addition, the second removal hole is a structure of four semicircular grooves maintaining a predetermined spacing.

[0020] In addition, a fifth fastening hole is formed on each corner portion of one side and the other end of the fixed body, into which a stripper bolt supporting the fixed body is fastened. Effects of the invention

[0022] Thus, the present invention comprises a fixing device for pre-measuring and adjusting rotational torque that implements constraint conditions of a drive unit housing and a shaft, for controlling bearing preload in a single-part state simulating an actual assembly environment. Through this, reliable rotational torque data is secured in advance in a single-part state before assembling the bearing to the rotary drive unit, and torque changes resulting from the application of a shim are immediately fed back using this data to derive the optimal shim thickness, thereby enabling the setting of preload and maximizing the satisfaction of rotational performance of the rotary drive unit during final assembly. Furthermore, it prevents the risk of physical damage to precision optical instruments that are difficult to disassemble due to press-fit structures or narrow spaces, while ensuring flexibility in the assembly process to prevent irreversible losses in the assembly process and improve process efficiency. Additionally, it achieves production cost reduction and quality standardization by realizing the target level of driving performance with general-specification bearings without relying on expensive ultra-precision bearings, and allows for easy analysis of the causes and history management of quality issues that may occur in the future regarding the rotary drive unit.

[0023] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims. Brief explanation of the drawing

[0025] FIG. 1 is a schematic perspective view showing a structure in which a bearing is applied to the rotary drive part of a conventional optical device. FIG. 2 is a schematic cross-sectional view showing the structure of a state in which rotational torque is measured after a bearing is applied to the rotary drive part of a conventional optical device. FIG. 3 is a combined perspective view showing the structure of a fixture for measuring and adjusting the rotational torque of a bearing as an embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of FIG. 3 as an embodiment of the present invention. FIG. 5 is an exploded perspective view showing the structure of a fixture for measuring and adjusting the rotational torque of a bearing as an embodiment of the present invention. FIG. 6 is an exploded front view of FIG. 5 as an embodiment of the present invention. FIG. 7 is a schematic cross-sectional view of FIG. 6 as an embodiment of the present invention. FIG. 8 is an exploded front view of an assembly comprising a bearing, a bearing inner ring mounting part, and a bearing inner ring retainer, as an embodiment of the present invention. FIG. 9 is a schematic cross-sectional view of FIG. 8 as an embodiment of the present invention. FIG. 10 is a diagram showing the state of pre-measuring the rotational torque of a bearing fixed to a fixing device as an embodiment of the present invention. Specific details for implementing the invention

[0026] The detailed description of the invention refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that various embodiments of the invention are different but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described herein in relation to one embodiment may be implemented in other embodiments without departing from the spirit and scope of the invention. It should also be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the invention. Accordingly, the following detailed description is not intended to be limiting, and the scope of the invention is limited only by the appended claims, including all equivalents to those claimed therein, provided appropriately described. Similar reference numerals in the drawings refer to the same or similar functions across various aspects.

[0027] Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

[0028] FIG. 3 is an assembled perspective view showing the structure of a fixing device for measuring and adjusting the rotational torque of a bearing as an embodiment of the present invention, FIG. 4 is a schematic cross-sectional view of FIG. 3 as an embodiment of the present invention, FIG. 5 is an exploded perspective view showing the structure of a fixing device for measuring and adjusting the rotational torque of a bearing as an embodiment of the present invention, FIG. 6 is an exploded front view of FIG. 5 as an embodiment of the present invention, FIG. 7 is a schematic cross-sectional view of FIG. 6 as an embodiment of the present invention, FIG. 8 is an exploded front view of an assembly consisting of a bearing, a bearing inner ring mounting part, and a bearing inner ring retainer as an embodiment of the present invention, FIG. 9 illustrates a schematic cross-sectional view of FIG. 8 as an embodiment of the present invention.

[0029] Referring to the attached FIGS. 3 to 9, the fixing device for measuring and adjusting the rotational torque of a bearing according to an embodiment of the present invention fixes the bearing (1) before it is assembled to the actual rotational drive unit of an optical device, and then pre-measures and adjusts the rotational torque of the bearing (1) using a retainer assembly fixture (4), an adapter (5), and a torque gauge (6) while a preload is applied as shown in the attached FIG. 10. This includes a bearing inner ring mounting part (10), a bearing inner ring retainer (20), a fixing body (30), and a bearing outer ring retainer (40).

[0030] The bearing inner ring mounting portion (10) above is a part on which the bearing (1) is mounted, and includes a flange portion (11) forming a ring-shaped structure and a bearing inner ring support portion (12).

[0031] The flange portion (11) supports the lower end of the bearing (1) and is engaged within the assembly mounting portion (31) of the fixed body (30), and a plurality of first removal holes (11a) are formed to guide the removal of the bearing (1) from the inner ring support portion (12) when re-measuring after applying a shim.

[0032] Here, the first removal hole (11a) is a structure of four semicircular grooves that maintain a predetermined spacing (e.g., 90° spacing).

[0033] The bearing inner ring support (12) is formed to extend to a predetermined height from one side of the flange (11) and is mounted on the bearing (1). A plurality of first fasteners (12a) for fastening a first screw (T1) having a countersunk head are formed in the bearing inner ring support (12).

[0034] The bearing inner ring retainer (20) is positioned on the upper end of the bearing (1) which is mounted on the bearing inner ring mounting part (10), and forms a single assembly (BS) with the bearing inner ring mounting part (10) on which the bearing (1) is mounted, as shown in the attached FIGS. 6 to 9, by fastening the first screw (T1).

[0035] Here, the bearing inner ring retainer (20) is a ring-shaped structure facing the first fastener (12a) and having a plurality of second fasteners (21) formed for fastening the first screw (T1).

[0036] The above fixed body (30) is formed with an assembly mounting hole (31) on which an assembly (BS) is seated according to the assembly of the bearing (1), the bearing inner ring mounting part (10), and the bearing inner ring retainer (20). A plurality of third fastening holes (32) are formed in adjacent positions to the assembly mounting hole (31) to which a second screw (T1) having a countersunk head is fastened. A plurality of second removal holes (33) are formed inside the assembly mounting hole (31) to guide the removal of the assembly (BS) when re-measuring after applying a shim. The second removal holes (33) are four semicircular groove structures that maintain a predetermined spacing (e.g., 90° spacing).

[0037] Here, a fifth fastening member (34) may be formed on each corner portion of one side and the other end of the fixed body (30) to which a stripper bolt (50) supporting the fixed body (30) is fastened.

[0038] The bearing outer ring retainer (40) is fixed to the fixed body (30) at the top of the fixed body (30) through the second screw (T2), and is a ring-shaped structure that faces the third fastener (32) and has a plurality of fourth fasteners (41) formed for fastening the second screw (T2).

[0039] In this way, the operation of pre-measuring or adjusting the rotational torque of the bearing (1) through the fixing device according to the embodiment of the present invention is explained with reference to the attached FIGS. 3 to 10. First, the bearing (1) is mounted on the bearing inner ring mounting part (10), and then the bearing inner ring retainer (20) is assembled and fixed to the bearing inner ring mounting part (10) through the first screw (T1) to complete one assembly (BS).

[0040] After that, the assembly (BS) is inserted into the assembly mounting hole (31) of the fixed body (30), and the bearing outer ring retainer (40) is assembled and fixed to the fixed body (30) through the second screw (T2), thereby completing the assembly for pre-measuring or adjusting the rotational torque of the bearing (1).

[0041] Next, by connecting the drive shaft of an unillustrated drive unit to the bearing (1) to apply a preload, the rotational torque of the bearing (1) can be measured in advance through the torque gauge (6).

[0042] At this time, if the rotational torque of the bearing (1), which is pre-measured by the torque gauge (60), deviates from the design standard value due to excessive preload or other reasons, the operator separates the assembly (BS; 1, 10, 20) from the fixed body (30) through the second removal hole (33) formed in the fixed body (30) using a removal tool (e.g., screwdriver, etc.), and then separates the bearing (1) through the first removal hole (11a) formed in the bearing inner ring mounting part (10) that forms the assembly (BS; 1, 10, 20).

[0043] Afterward, a shim of appropriate thickness is applied to the separated bearing (1) to readjust the rotational torque, and then the assembly process described above is performed again. Then, the drive shaft of the drive unit is reconnected to the bearing (1) to apply preload again, and the rotational torque of the bearing (1) is measured again through the torque gauge (6), thereby completing the preliminary measurement and adjustment of the rotational torque of the bearing (1) before it is actually applied to the rotational drive unit of the precision optical instrument.

[0044] Although the technical concept of the fixing device for measuring and adjusting the rotational torque of a bearing according to the present invention has been described above together with the attached drawings, this is merely an illustrative description of the best embodiment of the present invention and is not intended to limit the present invention.

[0045] Accordingly, the present invention is not limited to the specific preferred embodiments described above, and anyone with ordinary knowledge in the art to which the invention pertains can make various modifications without departing from the essence of the invention as claimed in the claims, and such modifications will be within the scope of the claims. Explanation of the symbols

[0047] 1; Bearing 5; Adapter 6; Torque gauge 10; Bearing inner ring mounting part 11; Flange portion 11a; First removal hole 12; bearing inner ring support 12a; first fastener 20; bearing inner ring retainer 21; second fastener 30; Fixed body 31; Assembly mounting bracket 32; 3rd fastener 33; 2nd removal hole 34; 5th fastener 40; bearing outer ring retainer 41; 4th fastener 50; stripper bolt T1; 1st screw T2; 2nd screw BS; Assembly

Claims

Claim 1 A fixing device for measuring and adjusting the rotational torque of a bearing, wherein the rotational torque of the bearing is fixed to be pre-measured and adjusted using a torque gauge connected by an adapter while a preload is applied before assembly to the actual rotational drive part of an optical instrument, comprising: a bearing inner ring mounting part on which the bearing is mounted; a bearing inner ring retainer disposed on the upper end of the bearing mounted on the bearing inner ring mounting part and forming a single assembly with the bearing inner ring mounting part on which the bearing is mounted according to the fastening of a first screw; a fixing body having an assembly mounting hole formed therein on which a single assembly formed by the assembly of the bearing, the bearing inner ring mounting part, and the bearing inner ring retainer is seated; and a bearing outer ring retainer coupled and fixed to the fixing body through a second screw at the upper end of the fixing body; wherein a plurality of second removal holes are formed inside the assembly mounting hole formed in the center of the fixing body to guide the removal of the single assembly when re-measuring after shim application. Claim 2 A fixing device for measuring and adjusting rotational torque of a bearing, wherein the bearing inner ring mounting portion is a ring-shaped structure comprising: a flange portion that supports the lower end of the bearing and is engaged within the assembly mounting portion; and a bearing inner ring support portion formed to extend to a predetermined height from one surface of the flange portion and on which the bearing is mounted, and wherein a plurality of first fastening portions for fastening the first screw are formed in the bearing inner ring support portion. Claim 3 A fixing device for measuring and adjusting the rotational torque of a bearing according to claim 2, characterized in that a plurality of first removal holes are formed in the flange portion to guide the removal of the bearing from the inner ring support portion of the bearing when re-measuring after shim application. Claim 4 A fixing device for measuring and adjusting rotational torque of a bearing, characterized in that, in claim 3, the first removal hole is a four semicircular groove structure maintaining a predetermined spacing. Claim 5 A fixing device for measuring and adjusting rotational torque of a bearing according to claim 2, characterized in that the bearing inner ring retainer is a ring-shaped structure facing the first fastener and having a plurality of second fasteners formed therein for fastening the first screw. Claim 6 A fixing device for measuring and adjusting rotational torque of a bearing, characterized in that, in claim 1, a plurality of third fastening holes are formed at adjacent positions to which the second screw is fastened at the center of the fixed body, and the bearing outer ring retainer is a ring-shaped structure facing the third fastening holes and having a plurality of fourth fastening holes formed for fastening the second screw. Claim 7 delete Claim 8 A fixing device for measuring and adjusting rotational torque of a bearing, characterized in that, in claim 1, the second removal hole is a four semicircular groove structure maintaining a predetermined spacing. Claim 9 A fixing device for measuring and adjusting rotational torque of a bearing, characterized in that, in claim 1, a fifth fastening hole is formed on each corner portion of one side and the other end of the fixed body, into which a stripper bolt supporting the fixed body is fastened.

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