Nut loosening prevention structure and bolt loosening prevention structure

Abstract

To provide means for effectively exerting a loosening prevention effect for a bolt or nut.SOLUTION: A plurality of ratchet fastening parts A are provided on a fastened target B or an auxiliary tool C, the ratchet fastening parts A including at least: an insertion hole 40 into which a bolt 10 engaging with a nut 20 on which a gear part 30 is provided can be inserted; and a restriction part 50 which is configured to be engageable with the gear part 30 and can restrict a rotation in a loosening direction of the nut 20 engaged with the bolt 10. With this configuration, two effects are provided including looseness prevention by a single body of the ratchet fastening part A, and a looseness prevention of restricting the rotation of the fastened target B or the auxiliary tool C by providing the plurality of ratchet fastening parts A to the fastened target B or the auxiliary tool C. This allows sure exhibition of a looseness prevention effect of the bolt or nut.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a structure for preventing a nut from loosening and a structure for preventing a bolt from loosening. [Background technology]

[0002] The following Patent Document 1 discloses a device for preventing loosening of a bolt or nut, which uses a ratchet mechanism to allow the bolt or nut to rotate only in the tightening direction, thereby preventing the bolt or nut from loosening. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-189522 Summary of the Invention [Problem to be solved by the invention]

[0004] In the anti-loosening device described in Patent Document 1, the base (7) inserted between the bolt or nut and the fastened object needs to be made non-rotatable. To achieve this, it is essential to provide a protrusion (9) on the base (7) and further process the member facing the base (7) by providing a groove (5) that engages with the protrusion (9).

[0005] The present invention has an object to provide a means for more effectively preventing bolts and nuts from loosening, using a method different from that of the prior art described above. [Means for solving the problem]

[0006] The present invention, which has been made to solve the above-mentioned problems, has a ratchet fastening portion that includes at least an insertion hole through which a bolt that screws into a nut provided with a gear portion can be inserted, and a regulating portion that is configured to be freely engaged with the gear portion and can regulate rotation in a direction to loosen the nut screwed onto the bolt, and is characterized in that a plurality of the ratchet fastening portions are provided on an object to be fastened or an auxiliary device that is fastened together with the object to be fastened. In the present invention, the gear portion may be integrated with the nut. In the present invention, the gear portion may be configured to be detachable from the nut.

[0007] The present invention is also characterized in that it has a ratchet fastening portion including at least an insertion hole through which a bolt having a gear portion can be inserted, and a regulating portion configured to be freely engaged with the gear portion and capable of regulating rotation in a direction to loosen the bolt screwed into a nut, and that a plurality of the ratchet fastening portions are provided on an object to be fastened or an auxiliary tool to be fastened together with the object to be fastened. In the present invention, the gear portion may be integrated with the bolt. In the present invention, the gear portion may be configured to be detachable from the bolt. Effect of the Invention

[0008] According to the present invention, while each ratchet fastening portion prevents loosening of the bolt or nut, by providing multiple ratchet fastening portions on the object to be fastened or on an auxiliary device that is fastened together with the object to be fastened, it is possible to more reliably prevent loosening of the bolt or nut by providing two functions: prevention of loosening by the ratchet fastening portion alone, and prevention of loosening by restricting the rotation of the object to be fastened or the auxiliary device by providing multiple ratchet fastening portions on the object to be fastened or the auxiliary device. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic front view showing the nut loosening prevention mechanism according to the first embodiment. [Diagram 2] FIG. 2 is a schematic plan view showing a nut loosening prevention mechanism according to the first embodiment. [Diagram 3] FIG. 4 is a schematic diagram showing modified examples 1 to 3. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. EXAMPLES

[0011] <1> Overall configuration (Fig. 1) FIG. 1 shows an example of a nut loosening prevention structure according to this embodiment, in which an auxiliary tool C is used to fasten both an object to be fastened B1 and an object to be fastened B2 together when fastening them, and this auxiliary tool C is provided with two ratchet fastening portions A. The ratchet fastening portion A includes at least an insertion hole 40 and a restriction portion 50 . The insertion hole 40 receives the bolt 10 which screws into the nut 20 having the gear portion 30, and the restricting portion 50 is configured to be freely engaged with the gear portion 30 and acts to restrict rotation of the nut 20 screwed into the bolt 10 in the direction of loosening. The details of each part will be explained below.

[0012] <2> Bolts and nuts (Fig. 1) The bolt 10 and the nut 20 are members that function as fasteners. In the present invention, known materials may be used for the bolt 10 and the nut 20. In this embodiment, the bolt 10 and the nut 20 are configured as separate members from the objects B1, B2 to be fastened.

[0013] <3> Gear section (Fig. 1, Fig. 2) The gear portion 30 is a member that constitutes a ratchet mechanism together with the restriction portion 50 . In the present invention, the gear portion 30 is provided integrally with or detachably attached to at least one of the bolt 10 or the nut 20, and is configured to be capable of restricting rotation in the direction of loosening the bolt 10 or the nut 20 on which the gear portion 30 is provided. Further, in the present invention, the shape of the gear portion 30 is not particularly limited, and any shape that can realize a ratchet mechanism can be adopted. In this embodiment, a gear portion 30 is configured with a diameter larger than that of the nut 20 and with teeth 31 of approximately right-angled triangle shape arranged continuously around its outer periphery, and this gear portion 30 is fixed to the surface of the nut 20 on the head side of the bolt 10 and configured to rotate in conjunction with the rotation of the nut 20 (Figure 2). In this embodiment, a portion having a tapered surface that comes into contact with the insertion hole 40 is formed below the gear portion, but this portion is not an essential portion in the structure according to the present invention.

[0014] <4> Insertion hole (Fig. 1) The insertion hole 40 is a hole for inserting the shaft portion 11 of the bolt 10 therethrough. The insertion holes 40 are provided at positions communicating with bolt holes provided in the respective fastening objects B1, B2. In this embodiment, the support tool C is provided with two insertion holes 40 in both the base part C1 and the cover part C2.

[0015] <5> Restriction section (Fig. 1, Fig. 2) The restriction portion 50 is a member that constitutes a ratchet mechanism together with the gear portion 30. In the present invention, the regulating portion 50 is configured to have a structure that is freely engageable with the teeth 31 of the gear portion 30 provided on at least either the bolt 10 or the nut 20, thereby regulating the rotation of the bolt 10 or the nut 20 fixed to the gear portion 30.

[0016] In the present invention, the shape of the restriction portion 50 is not particularly limited, and any shape that can realize a ratchet mechanism can be adopted. In this embodiment, the regulating portion 50 is composed of an elastic member 51 having one end connected to the base portion, and an engaging member 52 connected to the other end of the elastic member 51 and capable of freely protruding and retracting toward the gear portion 30 in conjunction with the rotation of the gear portion 30 by the elastic force of the elastic member 51 (FIG. 2).

[0017] When the gear portion 30 attempts to rotate in the direction of tightening the nut 20, the engaging member 52 is pushed by the teeth 31 of the gear portion 30 and is able to retract so as to compress the elastic member 51, and when the gear portion 30 attempts to rotate in the direction of loosening the nut 20, one side of the teeth 31 of the gear portion 30 continues to interfere with the engaging member 52, making it unable to retract, thereby realizing a ratchet mechanism (Figure 2). In this embodiment, the restricting portion 50 is housed in a recess provided in a base portion C1 constituting the auxiliary tool C, and a lid portion C2 is placed to cover this recess.

[0018] <6> Details of the anti-loosening effect (Fig. 2) Referring again to FIG. 2, the loosening prevention effect of the present invention will be described in detail. (Function 1) The function of preventing the nut 20 from loosening by each ratchet fastening portion A Each ratchet fastening portion A can restrict, by means of the gear portion 30 and the restricting portion 50, the rotation of the nut 20 relative to the bolt 10 in a direction that loosens the nut 20. Therefore, the ratchet fastening portion A alone exerts a loosening prevention effect. (Function 2) The function of preventing loosening of the nut 20 caused by the rotation of the auxiliary tool C by the multiple ratchet fastening parts A By providing a plurality of ratchet fastening portions A on the auxiliary tool C and inserting each of the bolts 10 through the ratchet fastening portions A, it is possible to restrict the rotation of the auxiliary tool C around the shaft portion 11 of each of the bolts 10 . As a result, co-rotation of the nut 20 caused by the rotation of the auxiliary tool C can be prevented.

[0019] <7> summary In this way, according to the present invention, the above-mentioned two actions make it possible to more reliably prevent the bolt 10 or the nut 20 from loosening. EXAMPLES

[0020] Another modified example of the present invention will be described with reference to FIG. <1> Modification 1 (Figure 3(a)) In this example, the auxiliary tool C described in the first embodiment is not provided, and a plurality of ratchet fastening portions A are provided on one of the fastening objects B1. <2> Modification 2 (Figure 3(b)) This example is an example in which a bolt loosening prevention structure is configured by providing an auxiliary tool C with multiple ratchet fastening portions A on the head side of a bolt 10. This configuration can be applied to cases in which the nut 20 or nut element is fixed in advance to one of the fastening objects B1. <3> Modification 3 (Figure 3(c)) In this example, the shaft portion 11 of the bolt 10 is integrated with the other object to be fastened B2, and an auxiliary tool C having multiple ratchet fastening portions A is provided on the side of the nut 20 that fastens to this shaft portion 11. [Industrial Applicability]

[0021] The structure according to the present invention can be applied, for example, to hub nuts used to secure vehicle wheels. [Explanation of symbols]

[0022] A: Ratchet fastening part B: Target of contract C: Auxiliary equipment C1: Base C2: Lid 10: Bolt 11: Shaft 20: Nut 30: Gear section 31: Teeth 40:Through hole 50: Regulation Department 51: Elastic member 52: Engagement member

Claims

1. an insertion hole through which a bolt that screws into the nut having the gear portion can be inserted; a restricting portion configured to be freely engaged with the gear portion and capable of restricting rotation of the nut screwed onto the bolt in a direction to loosen the nut; A ratchet fastening portion including at least A plurality of the ratchet fastening portions are provided on the fastening object or on an auxiliary tool that is fastened together with the fastening object. Structure prevents nuts from loosening.

2. The gear portion is integrated with the nut. The nut loosening prevention structure according to claim 1.

3. The gear portion is configured to be detachable from the nut. The nut loosening prevention structure according to claim 1.

4. An insertion hole through which a bolt having a gear portion can be inserted; a restricting portion configured to be freely engaged with the gear portion and capable of restricting rotation of the bolt screwed into the nut in a direction to loosen the bolt; A ratchet fastening portion including at least A plurality of the ratchet fastening portions are provided on the fastening object or on an auxiliary tool that is fastened together with the fastening object. Structure prevents bolts from loosening.

5. The gear portion is integrated with the bolt. The bolt loosening prevention structure according to claim 4.

6. The gear portion is configured to be detachable from the bolt. The bolt loosening prevention structure according to claim 4.

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