Pinning device that can keep screw tightening torque within tolerance

Abstract

The present invention provides a pinning device that can prevent screws from loosening and nuts from falling off within the tightening torque tolerance without the need for shim ring adjustment or bolt replacement. [Solution] The present invention uses a positioning socket 30 to determine the relative angle between the nut 20 and bolt 10, then replaces it with a fixed socket and fastens it with a pin. While conventional grooved nuts 20 have six grooves and the angle at which they mate with the hole 11 of the bolt 10 is every 60 degrees, the positioning socket has a maximum number of grooves that is a multiple of six, minimizing the angle at which it mates with the hole 11 of the bolt 10 and allowing it to be pinned within the tolerance of the standard tightening torque, preventing loosening of the screw and the nut 20 from falling off.

Description

[Technical Field]

[0001] The present invention relates to preventing bolt loosening by pinning. [Background technology]

[0002] Conventionally, methods for preventing screw rotation can be broadly divided into mechanical fixation and other methods, with mechanical fixation being the most reliable and sure of these, and a representative example is a method in which the groove of a JIS 1170 grooved nut is aligned with the position of a bolt hole drilled in the bolt and secured with a split pin to prevent loosening and falling off.This method has a long history and is still used in many automobiles, aircraft, etc., and similar rotation stoppers are found in Patent Document 1 and Patent Document 2.

[0003] Patent Document 1 discloses a nut including a male threaded portion, a shaft having a through hole formed in the male threaded portion and penetrating in the radial direction, and a nut that is screwed onto the shaft and has an engaged portion formed on the outer periphery of a head portion that protrudes upward from the top surface. a socket that penetrates the shaft, has an engaging portion formed at its bottom that covers only the head of the nut and engages with the engaged portion, and has an insertion portion formed at its top through which a pin is inserted; and a pin; by rotating the socket, the position of the socket relative to the nut is adjusted to align the insertion portion of the socket with the through hole of the shaft, and the pin is inserted into the insertion portion and the through hole, thereby preventing relative rotation between the nut and the shaft; the value obtained by dividing 360 by the least common multiple of the number of engagement combinations of the engaging portion and the engaged portion in the circumferential direction, the number of the insertion portions, and the number of openings of the through holes is less than 30; the value obtained by dividing 360 by the least common multiple of the number of engagement combinations of the engaging portion and the engaged portion in the circumferential direction, the number of the insertion portions, and the number of openings of the through holes is 10 or less; the number of engagement combinations of the engaging portion and the engaged portion in the circumferential direction is 7 or 9, and the number of the insertion portions is 8 or 10 The number of openings of the through holes is 2 or 4.

[0004] Patent Document 2 is characterized by comprising a shaft having a male thread and a radially penetrating through hole formed in a portion, a nut that screws onto this shaft, a socket that is fitted onto the shaft and has a plurality of protrusions that extend axially along the circumferential direction, an elastic body that is compressed and interposed between the socket and the nut, and pins that are inserted between the communicating hole of the shaft and the protrusions located on both sides of the communicating hole and have locking portions formed on each part that protrudes from both sides of the communicating hole, thereby pressing the nut against the object to be fastened and actively preventing rotation of the nut. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4483634

[0006] [Patent Document 2] Patent No. 1439514 Summary of the Invention [Problem to be solved by the invention]

[0007] Conventional pin-based loosening prevention devices include JIS1170 grooved nuts and similar types. However, since grooved nuts have six grooves, if the grooves in the nut do not align with the bolt holes when tightened with the standard tightening torque, it is necessary to rotate the nut up to 60 degrees to reach the next groove. Since this exceeds the standard tightening torque tolerance, the increase in tightening torque is prevented by skilled work such as adjusting with a shim ring or replacing the bolt.

[0008] Furthermore, if a grooved nut or similar grooved hardware is tightened once it has been installed, the phase with the bolt hole will shift and the pin will no longer fit, making it impossible to fasten the pin. The object of this invention is to fasten the pin with the tightening torque tolerance from any position without the need for adjustment or skill. [Means for solving the problem]

[0009] To solve the problem, the top of the groove in the positioning socket closest to the top of the diagonal corner of the nut is engaged with the top of the nut at a position where the bolt hole is clearly visible from one of the long through holes in the positioning socket, and the angle and direction of the phase shift between the long through hole and the bolt hole is visually confirmed, then the positioning socket is removed and the nut is tightened or loosened and rotated to correct the phase shift between the long through hole and the bolt hole, and then the positioning socket is removed and a fixing socket having a through hole that is in phase with the long through groove and bolt hole is engaged with the nut, and the through hole and bolt hole are secured with pin 50.

[0010] In order to ensure that the tightening torque of the screw in question falls within the standard tightening torque tolerance, the positioning socket's oblong through hole consists of a reference oblong through hole on an axial reference line that is in phase with the top of the groove, which is 360 degrees divided by a multiple of 6, the number of sides of the nut; a first oblong through hole that is angled from the reference oblong through hole in the loosening direction by an angle obtained by multiplying the angle of the groove spacing by a multiple of 6 and dividing the angle of the groove spacing into thirds; and a second oblong through hole that is angled by two-thirds of the groove spacing.In order to make the oblong through holes as uniform as possible, the first oblong through hole is shaped so that its phase is in the range of 50 to 60 degrees from the reference line in the loosening direction, and the second oblong through hole is shaped so that its phase is in the range of 100 to 120 degrees.

[0011] The through holes of the fixed socket consist of a reference through hole on an axial reference line that is 46 phase with the top of the groove, which is 360 degrees divided by a multiple of 6, the number of angles in the nut; a first through hole that is formed by adding an angle obtained by multiplying the angle of the groove spacing by a multiple of 6 in the loosening direction from the reference through hole and dividing the angle of the groove spacing into thirds; and a second through hole that is formed by adding two-thirds of the angle of the groove spacing.In order to make the through holes as uniform as possible, the first through hole is formed in a phase range of 50 to 60 degrees from the directrix in the loosening direction, and the front second through hole is formed in a phase range of 100 to 120 degrees.

[0012] For example, if an M12 bolt has a pitch of 1.75 mm, and the number of grooves is 36, which is a multiple of 6, and the angle between the grooves is divided into thirds, the angle at which the slotted through holes in the positioning socket and the bolt holes align will be approximately 3.3 degrees, which is 360 degrees divided by the multiple 36 and the divisor 3, and the phase can be adjusted by 1.65 degrees before and after the slotted through holes in the positioning socket and the through holes in the fixed socket.

[0013] While the tightening rotation angle of the nut at the standard tightening torque of M12 is 10.3 degrees, the angle at which the phase of the through-hole and bolt hole can be aligned is ±1.65 degrees, which is about one-sixth of the normal tightening torque, making it possible to set the tightening torque to ±16% of the standard tightening torque. [Effects of the Invention]

[0014] The present invention can shorten installation time by efficiently fastening pins without the need for adjustment using shim rings or replacing bolts, and can prevent screws from loosening and nuts from falling off without relying on experience, with a standard tightening torque tolerance of ±30% or less, or approximately ±16% or less. [Brief explanation of the drawings]

[0015] [Figure 1] 1A to 1C are a front view, a top view, a right side view, and a cross-sectional view taken along line AA, showing an embodiment of the present invention. [Figure 2] This is a front view, a top view, a right side view, and a cross-sectional view along the line DD when the positioning socket is being positioned. [Figure 3] 2 is a cross-sectional view taken along line BB and line CC in FIG. 1. [Figure 4] 3A and 3B are cross-sectional views taken along the lines EE and FF in FIG. 2. [Figure 5] 1A and 1B are front and top views of a bolt. [Figure 6] 1A and 1B are a front view and a right side view of a nut. [Figure 7] 1A to 1C are a front view, a top view, a left side view, and a right side view of a fixed socket. [Figure 8] 3A to 3C are a front view, a top view, a left side view, and a right side view of a positioning socket. DETAILED DESCRIPTION OF THE INVENTION

[0016] In order to keep the tightening torque within the standard tolerance of the screw, as shown in Figures 1, 2, 3, 4, 5, 6, 7 and 8, the apex 36 of the groove 34 of the positioning socket 30 closest to the diagonal apex 21 of the nut 20 is engaged with the apex 21 of the nut 20 at a position where the hole 11 of the bolt 10 can be clearly seen from any of the elongated through holes 31, 32 and 33 of the positioning socket 30, and the angle and direction of the phase shift between the elongated through hole and the hole 11 of the bolt 10 is visually confirmed. Next, the positioning socket 30 is removed, and the nut 20 is tightened or loosened and rotated to correct the phase misalignment between the long through hole and the hole 11 of the bolt 10. After that, the positioning socket 30 is removed, and the fixing socket 40, which has a long through groove and through holes 41, 42, 43 that are in phase with the hole 11 of the bolt 10, is engaged with the nut 20, and the through hole and the hole 11 of the bolt 10 are secured with the pin 50.

[0017] In order to ensure that the tightening torque is within the standard tolerance of the screw, the oblong through holes of the positioning socket 30 consist of a reference oblong through hole 31 on an axial reference line 35 that is in phase with the peaks 36 of the grooves 34, which is obtained by dividing 360 degrees by a multiple of 6, the number of sides of the nut 20; a first oblong through hole 32 that is formed by multiplying the angle of the spacing between the grooves 34 by a multiple of 6 and then dividing the angle of the spacing between the grooves 34 into thirds; and a second oblong through hole 33 that is formed by adding two-thirds of the angle of the spacing between the grooves 34, and in order to make the oblong through holes as uniform as possible, the first oblong through hole 32 is set to have a phase that is within the range of 50 to 60 degrees from the reference line 35 in the loosening direction, and the second oblong through hole 33 is set to have a phase that is within the range of 100 to 120 degrees.

[0018] In order to ensure that the tightening torque is within the standard tolerance of the screw, the through holes of the fixed socket 40 consist of a reference through hole 41 on an axial reference line 45 that is in phase with the apexes 46 of the grooves 44, which are obtained by dividing 360 degrees by the number of corners of the nut 20 by a multiple of 6; a first through hole 42 that is spaced apart from the reference through hole 41 in the loosening direction by an angle obtained by multiplying the angle of the spacing between the grooves 44 by a multiple of 6 and dividing the angle into thirds; and a second through hole 43 that is spaced apart by two-thirds of the angle of the spacing between the grooves 44. In order to make the through holes as uniform as possible, the first through hole 42 is spaced apart from the reference line 45 in the loosening direction by an angle between 50 and 60 degrees, and the second through hole 43 is spaced apart by an angle between 100 and 120 degrees.

[0019] For example, when the pitch of M12 is 1.75 mm, the number of grooves 34 is 36, which is a multiple of 6, and the angle between the grooves 34 is divided into three equal parts, the angle at which the oblong through hole of the positioning socket 30 and the hole 11 of the bolt 10 meet is approximately 3.3 degrees, which is 360 degrees divided by 3, the number of grooves 34 (36) and the number of equal parts (3), and the nut 20 allows phase adjustment by 1.65 degrees before and after approximately 3.3 degrees.

[0020] While the tightening rotation angle of the nut 20 at the standard tightening torque of M12 is 10.3 degrees, the angle at which the phase of the through-hole and the hole 11 of the bolt 10 can be aligned is ±1.65 degrees, which is approximately one-sixth of the normal tightening torque, making it possible to set the tightening torque to ±16% of the normal tightening torque. [Explanation of symbols]

[0021] 10 volts 11 holes 20 nuts 21 Diagonal Peak 30 Positioning socket 31 Reference through slot 32 First through slot 33 Second through hole 34 Groove 35 Reference Line 36 Top 40 Fixed Socket 41 Reference through hole 42 First through hole 43 Second through hole 44 Groove 45 Reference Line 46 Top 50 pin

Claims

1. In order to bring the screw tightening torque within the standard tolerance, the crest of the groove in the positioning socket closest to the crest of the diagonal corner of the nut is engaged with the crest of the nut at a position where the bolt hole is clearly visible from one of the slotted through holes in the positioning socket, and the angle and direction of the phase shift between the slotted through hole and the bolt hole are visually confirmed, after which the positioning socket is removed and the nut is tightened or loosened and rotated to correct the phase shift between the slotted through hole and the bolt hole, and then the positioning socket is removed and a fixing socket having a through hole in the same phase as the slotted through groove and bolt hole is engaged with the nut and fastened with a pin (50).

2. 2. The pin fastening device of claim 1, characterized in that the positioning socket comprises: a reference through slot on an axial reference line that is in phase with the apex of the grooves, which is obtained by dividing 360 degrees by a multiple of 6, the number of angles of the nut, in order to keep the screw within the standard tightening torque tolerance; a first through slot that is formed from the reference through slot in the loosening direction by an angle obtained by multiplying the angle of the groove spacing by a multiple of 6 and dividing the angle of the groove spacing into thirds; and a second through slot that is formed by adding two-thirds of the angle of the groove spacing, and in which the phase of the first through slot is set to a range of 50 to 60 degrees from the reference line in the loosening direction and the phase of the second through slot is set to a range of 100 to 120 degrees in order to make the through slots as uniform as possible.

3. 2. The pinning device according to claim 1, characterized in that the pinning device comprises: a reference through hole on the reference line in the axial direction that has the same phase as the apex of the grooves obtained by dividing 360 degrees by an even multiple of 6, the number of angles of the nut, in order to keep the standard tightening torque tolerance within the range; a first through hole added with an angle obtained by multiplying the angle of the groove spacing by a multiple of 6 and dividing the angle of the groove spacing into thirds from the reference through hole in the loosening direction; and a second through hole added with an angle that is two-thirds of the angle of the groove spacing, and the first through hole is in a phase range of 50 to 60 degrees from the reference line in the loosening direction and the second through hole is in a phase range of 100 to 120 degrees in order to make the through holes as uniform as possible.

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