JP2016183759A - Wedge fixing nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wedge fixing nut that avoids breakage of a bolt in a case of using a wedge function, enables management of the same axial force as normal bolt and nut, and is excellent in a looseness prevention effect.SOLUTION: A wedge fixing nut includes a main nut 1 having a wedge installation part at its one end surface part, an elastic body wedge 10 installed in the wedge installation part of the main nut 1, and a fixing nut 14 having a recess part fitted into the elastic body wedge 10. By fastening the main nut 1 screwed into a bolt 30 with the fixing nut 14, the elastic body wedge 10 is pressed in the direction of the bolt 30, and the tip part of the elastic body wedge 10 is crimped to the bolt 30.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a nut that is unlikely to loosen even when vibration is applied, and more particularly to a wedge fixing nut that uses a wedge function to exhibit a loosening prevention effect.

  As a conventional locking nut, one using a wedge function, one having a pre-vailing torque function, one having a pinning function, and the like are known. In particular, as an example using the wedge function, the invention described in Japanese Patent Application Laid-Open No. 2002-206515 (Patent Document 1) includes a washer having a protruding portion between the non-fastened body and an eccentric inner diameter, and a cross-sectional view. A nut formed with a trapezoidal recess is screwed together so that the eccentric inner peripheral edge of the washer protrusion is bitten into the male thread crest of the bolt. However, since the nut is in contact with only part of the surface of the washer, the nut and washer do not contact in parallel. In addition, the bolt is inclined with respect to the bolt. May break.

  In addition, the invention described in Japanese Patent Application Laid-Open No. 2013-213523 (Patent Document 2) corrects the defects of the invention described in Japanese Patent Application Laid-Open No. 2002-206515 (Patent Document 1) to some extent. The defect has not been resolved. Unless the flat surface of the convex washer is perpendicular to gravity, be sure to install the convex washer so that it is perpendicular to the contact surface of the non-fastened body and the inner edge of the washer is centered on the outer diameter of the bolt male thread. Later, the nut must be screwed together. That is, it is necessary to temporarily hold the convex washer by hand except that the nut concave side is downward, and tighten the nut after temporarily fixing it, resulting in individual differences and variations in workability. In addition, repeated use is not possible because it causes biting flaws on the top of the screw male thread and the thread flank. Sometimes seizure occurs on the inner periphery of the convex washer and the male thread, and the bolt may break when trying to return the nut.

The following problems are mentioned as a fundamental defect of the conventional locking nut using the above-described eccentric washer.
(1) The washer that serves as a wedge is a structure that presses the bolt (male thread) in a stress-concentrated area circumferentially, and scratches not only on the top of the thread but also on the flanks of the thread (valley diameter). wear.
(2) The eccentric washer does not fit in a predetermined position, and biting starts at a position away from the fastening surface. Therefore, a gap is generated between the nut and the surface to be fastened, bending stress is applied to the bolt, and the bolt is broken. In addition, bolts and nuts cannot be tightened by generating an axial force on the original bolt.
(3) Even if the fastening surface of the fastened part, the eccentric washer, and the nut are tightened at a predetermined (normal) position, the stress is dispersed in the lateral direction where the nut intersects the axial force line of the male screw outer diameter, Normally, a tightening torque exceeding the normal range is required. Or the variation is large.
(4) It cannot be used repeatedly (large scratches). When removing the fastened nut, seizure occurs for the above reason, and when it is returned, the bolt screw part is broken.
(5) In the case of bolts and nuts subjected to galvanized molten zinc plating for outdoor use, as a phenomenon that appears prominently, it is impossible to uniformly adhere JIS standard 350 g / m2 of molten zinc. The surface (2), (3), and (4) are remarkably deteriorated due to the occurrence of zinc pools on the irregularities and thread valleys.

  As an example of a conventional locking nut provided with an elastic portion formed integrally with a nut body, the invention described in Japanese Patent Application Laid-Open No. 11-247824 (Patent Document 3) includes a nut body provided with a screw hole, And an elastic part provided on the end surface of the nut body, and the elastic part exerts a loosening prevention effect by urging a bolt screwed into the nut body. However, since the elastic part and the nut body are integrated and subject to the restrictions of the material to satisfy the function of the nut, it is not possible to use a material with large spring elasticity as the elastic part material. Is difficult to process. In addition, since the lock piece is movable and this lock piece is integrated with the engaging portion, stress is concentrated on the boundary portion between the engaging portion and the lock piece, and a crack occurs. In such a case, it may be damaged, and it is not reliable.

JP 2002-206515 A JP 2013-213523 A JP-A-11-247824

  Therefore, the present invention aims to solve a fundamental defect of the conventional locking nut, avoids breakage of the bolt when using the wedge function, and manages the same axial force as a normal bolt and nut. It is an object of the present invention to provide a wedge fixing nut that can achieve the above and has an excellent anti-loosening effect.

  In order to solve the above problems, the invention according to claim 1 is characterized in that a main nut having a wedge mounting portion on one end surface portion, an elastic body wedge mounted on the wedge mounting portion of the main nut, A fixing nut having a recess for fitting an elastic body wedge, and by tightening the main nut screwed with a bolt with the fixing nut, the elastic body wedge is pressed in the bolt direction, and the elastic body wedge It is characterized by being comprised so that the front-end | tip part may be crimped | bonded to a volt | bolt.

  According to a second aspect of the present invention, the wedge mounting portion of the main nut according to the first aspect has an arcuate constricted shape, and the elastic body wedge is mounted to the opening of the female screw portion. It has one or two grooves or holes for positioning.

  According to a third aspect of the present invention, the wedge mounting portion of the main nut according to the first or second aspect includes a retaining means for preventing the mounted elastic body wedge from slipping out. It is characterized by that.

  According to a fourth aspect of the present invention, the elastic wedge according to the second aspect has an inner shape that matches the constricted shape of the main nut, and bends one or both ends inward. The tip portion has a plate-like or linear shape.

  According to a fifth aspect of the present invention, the concave portion of the fixing nut according to the first aspect has a taper portion that sequentially presses the elastic body wedge in the bolt direction, and the same outer diameter as the elastic body wedge. It is characterized by comprising a fitting part having an inner diameter dimension and a fixing part in contact with the end face of the wedge mounting part of the main nut.

  As described above, according to the wedge fixing nut according to the present invention, the elastic nut wedge is pressed in the bolt direction by tightening the main nut screwed with the bolt with the fixing nut, and the front end portion of the elastic wedge Since the bolts are crimped to the bolts, the wedges are crimped to avoid contact with the fastened body where the bolt stress is concentrated to avoid breakage of the bolts, and the same shaft as the normal bolts and nuts. It is possible to manage force and has a high effect of preventing loosening, and there is no significant effect of surface coating such as hot dip galvanizing. For this reason, it becomes possible to solve the fundamental defect of the conventional locking nut.

It is the front view (a) and side view (b) which show an example of the main nut concerning this invention. It is the front view (a) and side view (b) which show an example of the elastic body wedge concerning this invention. It is the front view (a) and side sectional view (b) which show an example of the fixing nut concerning the present invention. It is the front view (a) and perspective view (b) which show the state which attached the elastic body wedge to the main nut. It is front sectional drawing which shows the state which fastened the main nut with the fixing nut. It is explanatory drawing (a) and the expanded explanatory view (b) which show the state which the front-end | tip part of an elastic body wedge is crimped | bonded to a volt | bolt. It is a front view (a) (b) (c) (d) which shows the example of the whole shape of an elastic body wedge. It is a perspective view which shows the example of a change of the front-end | tip part of an elastic body wedge. It is explanatory drawing (a) and the expanded explanatory view (b) which show the state which the front-end | tip part of the elastic body wedge shown in FIG. 8 crimps | bonds to a volt | bolt. It is explanatory drawing which shows the example of a change of the retaining means of the wedge mounting part of a main nut.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, about each structure of the wedge fixing nut of this invention, it is not limited to a following example, It can change suitably with a use condition.

  1 is a front view (a) and a side view (b) showing an example of a main nut according to the present invention, FIG. 2 is a front view (a) and a side view (b) showing an example of an elastic wedge, and FIG. It is the front view (a) and side surface sectional view (b) which show an example of a fixing nut.

  As shown in FIG. 1, the main nut 1 has a hexagonal outer shape and has a screw hole 2 in the center. On one end face 4 side of the main nut 1, a cylindrical convex portion 9 having a wedge mounting portion 5 is formed. As shown in FIGS. 1 and 4, the wedge mounting portion 5 has an arcuate constricted shape, and has a step formed by a circumferential retaining portion 7 on the end face 4 side and a step portion 8 on the opposite side. An elastic wedge 10 which will be described later is attached to a portion between the provided portions. Further, in the opening portion of the female screw 3, two groove portions 6 for mounting and positioning the elastic wedge 10 are formed in the axial direction. Note that the number, shape, position, and the like of the groove portions 6 are not limited to the contents of the present embodiment, and are appropriately designed according to changes in the shape and structure of the elastic wedge 10. A modification example of the retaining portion 7 will be described later.

  As shown in FIG. 2, the elastic wedge 10 includes a main body portion 11, a bent portion 12, and a tip portion 13. The main body 11 of the elastic wedge 10 has an arcuate inner shape that matches the constricted shape of the main nut 1 and a circumferential length of about one half. Both ends of the elastic wedge 10 are bent to form a bent portion 12, and the tip portion 13 has a plate shape. Note that the length of the main body 11 of the elastic body wedge 10 and the number or shape of the front end portion 13 of the elastic body wedge 10 are not limited to the contents of the present embodiment, and a modification example thereof will be described later.

  As shown in FIG. 3, the fixing nut 14 has a hexagonal outer shape and has a screw hole 15 at the center. A cylindrical recess 21 into which the elastic wedge 10 is fitted is formed on one end surface 17 side of the fixing nut 14. The cylindrical recess 21 includes a tapered portion 18 that sequentially presses the elastic body wedge 10 in the bolt direction when tightening, a fitting portion 19 having an inner diameter that is the same as the outer diameter of the main body 11 of the elastic body 10, and The main nut 1 is composed of a fixing portion 20 that comes into contact with the end face 4 side of the wedge mounting portion 5. As a result, the main nut 1 screwed to the bolt is tightened with the fixing nut 14, whereby the elastic wedge 10 is pressed in the bolt direction, and the tip 13 of the elastic wedge 10 is crimped to the bolt (FIG. 5 or (See FIG. 6). That is, in the fixing nut 14, the elastic wedge 10 is successively drawn in the outer diameter direction of the male screw 31 by the tapered portion 18, and the biting occurs, and the fitting portion has the same inner diameter as the outer diameter of the main body 11 of the elastic wedge 10. 19 ensures that the tip 13 of the elastic wedge 10 bites. Further, by setting the depth of the cylindrical concave portion 21 of the fixing nut 14 to be shorter than the length of the cylindrical convex portion 9 of the main nut 1, tightening is completed at the same time as the rotation of the fixing nut 14 is stopped, and the confirmation work is facilitated.

  FIG. 4 is a front view (a) and a perspective view (b) showing a state where an elastic body wedge is attached to the main nut, FIG. 5 is a front sectional view showing a state where the main nut is fastened with a fixing nut, and FIG. It is explanatory drawing (a) and the expanded explanatory view (b) which show the state which the front-end | tip part of a wedge crimps | bonds to a volt | bolt.

  As shown in FIG. 4, in a state where the elastic wedge 10 is attached to the wedge attachment portion 5 of the main nut 1, the pressure-bonding surface 13 a of the distal end portion 13 of the elastic wedge 10 is the peak portion 32 of the male screw 31 of the bolt 30. It is set so as to be located on the outer side (same diameter as the outer diameter of the bolt male screw is about 5% larger). Further, as shown in FIG. 5 or FIG. 6, when the main nut 1 screwed with the bolt is fastened with the fixing nut 14, the crimping surface 13 a of the distal end portion 13 of the elastic wedge 10 is the male screw of the bolt 30. It sets so that it may interfere with the peak part 32 of 31 (it is smaller than the outer diameter dimension of a volt | bolt male screw). As a result, the elastic wedge 10 does not interfere at all when the bolt 30 is engaged, and can be smoothly tightened. The anti-slack effect can be exhibited by press-bonding to the peak portion 32 of 31.

  As described above, the wedge fixing nut of the present invention enables the repeated use by pressing the elastic wedge 10 at a portion avoiding the vicinity of the contact with the fastened body where the stress of the bolt 30 is concentrated. In addition to being able to avoid this, it is possible to manage the same axial force as that of a normal bolt and nut, and an excellent anti-loosening effect.

  Next, features of the elastic wedge according to the present invention will be described in detail. FIG. 7 is a front view (a) (b) (c) (d) showing an example of the overall shape of the elastic wedge.

  As shown in FIG. 7, the shape of the main body 11 of the elastic wedge 10 is an arcuate inner shape that matches the constricted shape of the main nut 1 as described above, and its length is about one-half. A circumferential length ((a) and (b) in the drawing) to a circumferential length of about three quarters ((c) and (d) in the drawing) is set. Both ends of the elastic wedge 10 are bent to form a bent portion 12, and one ((b) and (d) in the figure) or two (tips 13 in (a) and (c) in the figure). As described above, the tip end portion 13 has a crimping surface 13a for crimping a bolt, and the width of the elastic wedge 10 varies depending on the screw size, but is 1.5 times the pitch of the screw. It is considered that the larger the width of the elastic wedge 10 is, the more the loosening prevention effect is obtained, but it is necessary to always bite into at least one peak 32 of the male thread 31 of the bolt 30 (see FIG. 6 (b), symbol w) The thickness of the elastic wedge 10 is appropriately determined depending on the loosening prevention effect and mass productivity, but is set within a range of 0.6 to 1.2 mm, for example. As described above, the tip position of the body wedge 10 is an elastic body. In a state where the wedge 10 is attached to the wedge attachment portion 5 of the main nut 1 (see FIG. 4), the crimping surface 13 a of the tip portion 13 of the elastic wedge 10 is positioned outside the peak portion 32 of the male screw 31 of the bolt 30. In such a state that the main nut 1 screwed with the bolt is tightened with the fixing nut 14, the pressure-bonding surface 13 a of the tip 13 of the elastic wedge 10 is formed on the peak 32 of the male screw 31 of the bolt 30. It sets so that it may interfere (refer FIG. 5 or FIG. 6).

  A modification example of the elastic body wedge according to the present invention will be described. FIG. 8 is a perspective view showing a modified example of the distal end portion of the elastic wedge, and FIG. 9 is an explanatory view (a) and an enlarged explanatory view (b) showing a state in which the distal end portion of the elastic wedge is pressure-bonded to the bolt.

  As shown in FIG. 8, the elastic wedge 100 includes a main body portion 110, a bent portion 120, and a tip portion 130. The distal end portion 130 of the elastic wedge 100 has a linear shape, and the distal end portion 130 is press-fitted or joined to one end portion of the main body portion 110. The configuration of the main body 110 and the bent portion 120 is the same as that of the elastic wedge 10 shown in FIG. On the other hand, since the front end portion 130 of the elastic body wedge 100 has a linear shape, the groove portion 6 of the wedge mounting portion 5 of the main nut 1 can be changed to a hole portion (not shown). In a state where the elastic wedge 100 is mounted on the wedge mounting portion 5 of the main nut 1, the crimping surface 130 a of the distal end portion 130 of the elastic wedge 100 is positioned outside the peak portion 32 of the male screw 31 of the bolt 30. Set. Further, as shown in FIG. 9, when the main nut 1 screwed to the bolt is tightened with the fixing nut 14, the crimping surface 130 a of the tip 130 of the elastic wedge 100 is flank of the male screw 31 of the bolt 30. It sets so that it may interfere with part 33. As a result, the elastic wedge 100 does not interfere at all when the bolt 30 is engaged, and can be smoothly tightened. The loosening prevention effect can be exhibited by pressure bonding to the 31 flank portions 33.

  A modification of the retaining means for the main nut wedge mounting portion according to the present invention will be described. The above-described retaining portion 7 is formed by performing a constricting process by cutting, whereas the retaining portion 70 is formed by performing a caulking process with a press or the like as shown in FIG. For this reason, the retaining portion 7 for cutting is a circumferential surface, whereas the retaining portion 70 for caulking is retained at a plurality of points, and the retaining effect is considered to be slightly weak. The caulking process is excellent in mass productivity and has an advantageous effect in terms of cost advantage.

DESCRIPTION OF SYMBOLS 1 Main nut 2 Screw hole 3 Female screw 4 End surface 5 Wedge mounting part 6 Groove part 7 Retaining part 70 Retaining part 8 Step part 9 Cylindrical convex part 10 Elastic body wedge 100 Elastic body wedge
DESCRIPTION OF SYMBOLS 11 Main body part 110 Main body part 12 Bending part 120 Bending part 13 Tip part 13a Crimp surface 130 Tip part 130a Crimp surface 14 Fixing nut 15 Screw hole 16 Female screw 17 End face 18 Taper part 19 Fitting part 20 Fixing part 21 Cylindrical recess 30 Bolt 31 Male thread 32 Mountain top 33 Flank

In order to solve the above problems, the invention according to claim 1 is characterized in that a main nut having a wedge mounting portion on one end surface portion, an elastic body wedge mounted on the wedge mounting portion of the main nut, A fixing nut having a recess for fitting an elastic body wedge, and by tightening the main nut screwed with a bolt with the fixing nut, the elastic body wedge is pressed in the bolt direction, and the elastic body wedge Or the wedge mounting portion of the main nut has an arcuate constricted shape, and the elastic wedge is attached to the opening of the female screw portion for positioning. The elastic body wedge has an inner shape that coincides with the constricted shape of the main nut, and its length is from one-half circumferential length to three-fourths. Set in the range of the circumferential length And the end of one or both sides is bent inward, the tip has a plate shape, the tip has a pressure-bonding surface to which a bolt is crimped, and the tip is positioned at the elastic wedge. Is set so that the crimp surface of the tip of the elastic wedge is located outside the peak of the male thread of the bolt and is screwed with the bolt. In the state where the main nut is tightened with the fixing nut, the pressure-bonding surface of the tip of the elastic body wedge is set so as to interfere with the peak of the male thread of the bolt .

In the invention according to claim 2, the main nut having a wedge mounting portion on one end face portion, the elastic body wedge mounted on the wedge mounting portion of the main nut, and the elastic body wedge are fitted. A fixing nut having a recess, and the main nut screwed into the bolt is tightened with the fixing nut, whereby the elastic wedge is pressed in the bolt direction, and the tip of the elastic wedge is pressed against the bolt The main nut wedge mounting portion has an arcuate constricted shape, and one or two groove portions or hole portions for mounting and positioning the elastic wedge in the opening portion of the female screw portion. And the elastic wedge has an inner shape that coincides with the constricted shape of the main nut, and its length is in the range of 1/2 circumferential length to 3/4 circumferential length. Set and one or both sides The end is bent inward, the tip has a linear shape, the tip has a crimping surface for crimping the bolt, and the tip of the elastic wedge is attached to the main nut wedge. The main nut that is set so that the crimp surface of the tip of the elastic wedge is located outside the peak of the male thread of the bolt in the state of being attached to the bolt, and screwed into the bolt In this state, the pressure-bonding surface of the tip of the elastic body wedge is set so as to interfere with the flank portion of the male thread of the bolt .

According to a fourth aspect of the present invention, the concave portion of the fixing nut according to the first or second aspect includes a tapered portion that sequentially presses the elastic body wedge in the bolt direction, and an outer diameter of the elastic body wedge. It is characterized by comprising a fitting portion having the same inner diameter as the size, and a fixing portion that comes into contact with the end face of the wedge mounting portion of the main nut.

Claims (5)

A main nut having a wedge mounting portion on one end surface portion, an elastic body wedge mounted on the wedge mounting portion of the main nut, and a fixing nut having a recess for fitting the elastic body wedge;
By tightening the main nut screwed to the bolt with the fixing nut, the elastic wedge is pressed in the bolt direction, and the tip of the elastic wedge is configured to be crimped to the bolt. Features a wedge fixing nut. The wedge mounting portion of the main nut has an arcuate constricted shape, and is provided with one or two grooves or holes for mounting and positioning the elastic wedge at the opening of the female screw portion. The wedge fixing nut according to claim 1, wherein the wedge fixing nut is a nut. 3. The wedge fixing nut according to claim 1, wherein the wedge mounting portion of the main nut is provided with a retaining means for preventing the mounted elastic body wedge from slipping out. 4. The elastic wedge has an inner shape that matches the constricted shape of the main nut, has one or both side ends bent inward, and the tip has a plate-like or linear shape. The wedge fixing nut according to claim 2, wherein: The concave portion of the fixing nut includes a tapered portion that sequentially presses the elastic body wedge in the bolt direction, a fitting portion having an inner diameter that is the same as the outer diameter of the elastic body wedge, and a wedge mounting portion of the main nut. The wedge fixing nut according to claim 1, wherein the wedge fixing nut is configured by a fixing portion that abuts against the end face.

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