WO2014080645A1 - アースナット - Google Patents
アースナット Download PDFInfo
- Publication number
- WO2014080645A1 WO2014080645A1 PCT/JP2013/058150 JP2013058150W WO2014080645A1 WO 2014080645 A1 WO2014080645 A1 WO 2014080645A1 JP 2013058150 W JP2013058150 W JP 2013058150W WO 2014080645 A1 WO2014080645 A1 WO 2014080645A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bolt
- ground nut
- thread
- nut
- pitch
- Prior art date
Links
- 238000005520 cutting process Methods 0.000 claims abstract description 24
- 244000105624 Arachis hypogaea Species 0.000 claims description 128
- 235000010777 Arachis hypogaea Nutrition 0.000 claims description 128
- 235000003276 Apios tuberosa Nutrition 0.000 claims description 109
- 235000010744 Arachis villosulicarpa Nutrition 0.000 claims description 109
- 235000008692 Carum bulbocastanum Nutrition 0.000 claims description 19
- 238000003780 insertion Methods 0.000 claims description 13
- 230000037431 insertion Effects 0.000 claims description 12
- 239000003566 sealing material Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 description 33
- 238000000576 coating method Methods 0.000 description 33
- 238000005242 forging Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000001771 impaired effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/004—Sealing; Insulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/02—Shape of thread; Special thread-forms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/007—Removing paint or dirt layers covering the threaded part of nut-like members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
- F16B37/002—Nuts or like thread-engaging members cutting threads during screwing; removing paint or dirt layers covering threaded shanks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/28—Clamped connections, spring connections
- H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
- H01R4/34—Conductive members located under head of screw
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
- F16B2200/93—Fastener comprising feature for establishing a good electrical connection, e.g. electrostatic discharge or insulation feature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/30—Locking exclusively by special shape of the screw-thread
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2201/00—Connectors or connections adapted for particular applications
- H01R2201/26—Connectors or connections adapted for particular applications for vehicles
Definitions
- the present invention relates to a ground nut capable of obtaining a conduction state with a bolt.
- Patent Document 1 a ground nut having a deformed portion in which a part of a screw portion is reduced in diameter by an external force is known.
- the deformed portion peels off the coating film of the bolt, and a conductive state is obtained between the ground nut and the bolt.
- this deformed portion is formed by applying an external force to the side surface of the screw portion and reducing the diameter. For this reason, the shape of the deformed portion tends to vary. Therefore, there is a possibility that the conductive state between the deformed portion and the bolt varies and the ground performance of the ground nut varies.
- the present invention provides a ground nut that has a large fastening force and can be reliably connected to a bolt.
- the ground nut of the present invention capable of solving the above problems is A ground nut having a screw hole engaged with a bolt having a thread formed at a pitch P; For all the threads provided in the screw hole, the pitch Pn of the thread is larger than the pitch P of the thread of the bolt, and the angle ⁇ [degree] of the thread is larger than 60 degrees. And A notch extending in the axial direction is provided in a part of the screw hole in the axial direction, and an end face of the thread facing the notch forms a cutting edge.
- ground nut of the present invention it is preferable that conduction with the bolt is ensured when a tightening torque acts on the ground nut.
- the notch is preferably provided on at least one side in the axial direction.
- the notch is preferably provided on the bolt insertion side.
- the notches are provided on both sides in the axial direction.
- the ground nut of the present invention is preferably a nut with a bag.
- a sealing material is provided to fill a gap between the bolt and the screw hole.
- the fastening force is large, and a conductive state can be reliably obtained between the bolts.
- FIG. 2 is a sectional view taken along line II-II in FIG. It is sectional drawing of the engaging location of an earth nut and a volt
- FIG. 1 is a top view of the ground nut according to the present embodiment.
- 2 is a cross-sectional view taken along the line II-II in FIG.
- FIG. 3 is a cross-sectional view of a portion where the ground nut and the bolt are engaged.
- the ground nut 11 As shown in FIGS. 1 and 2, the ground nut 11 according to the present embodiment has a head portion 12 and a seat portion 13 provided below the head portion 12. This ground nut 11 is used, for example, when an electronic component is attached to the body of an automobile and grounded.
- the ground nut 11 has a function of peeling off a rust-proof coating film of the bolt when screwed with the bolt so as to ensure a good conduction state with the bolt to be screwed.
- the head 12 of the earth nut 11 is formed in a hexagonal shape in plan view that can be engaged with a tool such as a wrench.
- the seat portion 13 is formed in a disk shape in plan view that projects outward from the head portion 12.
- a chamfered portion 14 is formed on the edge portion of the upper surface 12 a opposite to the seat portion 13 in the head portion 12.
- the seat portion 13 has a seat surface protrusion 15 that is formed in a ring shape on a seat surface 13 a that is the surface opposite to the head portion 12 and projects downward.
- a screw hole 22 having a screw thread 21 is formed at the center of the ground nut 11.
- a bolt 33 having a thread portion 32 in which a thread 31 is formed at a pitch P can be engaged with the screw hole 22.
- the screw portion 32 of the bolt 33 is screwed into the screw hole 22 from the insertion side on the seat portion 13 side.
- the pitch Pn of all the screw threads 21 provided in the screw hole 22 of the ground nut 11 is formed to be larger than the pitch P of the screw thread 31 of the screw portion 32 of the bolt 33.
- the pitch Pn of the thread 21 of the ground nut 11 is expressed by the following formula (1) using the pitch P of the thread 31 of the threaded portion 32 of the bolt 33.
- ⁇ in this equation (1) is a value satisfying the following equation (2).
- the ground nut 11 is formed such that the angle ⁇ [degree] of the screw thread 21 is larger than 60 degrees ( ⁇ > 60). That is, the angle ⁇ of the thread 21 of the ground nut 11 is expressed by the following equation (3).
- ⁇ in the equation (3) is a value satisfying the following equation (4).
- the angle of the thread of bolts and nuts is 60 degrees.
- the ground nut 11 is provided with a notch 25 extending in the axial direction in a part of the screw hole 22.
- the notches 25 are provided in the circumferential direction at two locations on both sides of the bolt 33 in the axial direction of the screw hole 22 on the insertion side (lower side in FIG. 2) and the opposite insertion side (upper side in FIG. 2). It is formed in a total of six places, three places at intervals (see FIG. 1).
- the number of the notches 25 is not limited to this example, and any number may be formed.
- the end face of the screw thread 21 facing the notch 25 forms a cutting edge 26 capable of peeling the coating film of the bolt 33.
- the earth nut 11 configured as described above is screwed into the screw hole 22 by screwing the screw portion 32 of the bolt 33 into the screw nut 22.
- This accumulated pitch acts on both sides in the axial direction of the engaging portion between the screw hole 22 and the threaded portion 32, and the thread 31 of the bolt 33 and the thread 21 of the ground nut 11 are at high pressure on both sides in the axial direction.
- the high-pressure contact part T which contacts is produced. Thereby, when the screw portion 32 of the bolt 33 is screwed into the screw hole 22 of the ground nut 11, a large fastening force and pre-leveling torque can be generated by the high-pressure contact portion T.
- the ground nut 11 is provided with notches 25 on both sides of the screw hole 22 in the axial direction, and the cross section of the screw thread 21 facing the notch 25 is a cutting edge 26.
- the high-pressure contact portions T are generated on both sides in the axial direction of the engaging portion between the screw hole 22 of the ground nut 11 and the screw portion 32 of the bolt 33.
- the cutting edge 26 bites into the thread 31 of the threaded portion 32 of the bolt 33.
- the coating film of the bolt 33 is peeled off by the cutting edge 26. In this way, the ground nut 11 and the bolt 33 are reliably conducted by peeling off the coating film of the bolt 33.
- the notch 25 is formed in the screw hole 22, the notch 25 is provided in a part of both sides in the axial direction of the screw hole 22, so that the notch 25 is provided so as to penetrate in the axial direction. Compared with the case where it is made, the intensity
- the notches 25 are provided on both sides in the axial direction.
- the cutting edge 26 peels off the coating film on the flank side of the bolt 33, and on the anti-insertion side of the bolt 33, the cutting edge 26 moves on the flank side of the bolt 33.
- the coating film can be peeled off.
- the coating film on both sides of the flank surface can be further peeled off, and the conduction between the ground nut 11 and the bolt 33 can be ensured more reliably.
- the ground nut 11 fills a gap between the screw hole 22 of the ground nut 11 and the screw portion 32 of the bolt 33 on the side opposite to the insertion side of the bolt 33, for example, a sealing material such as rubber or resin. 43 is provided.
- a sealing material such as rubber or resin. 43
- FIG. 4 is a cross-sectional view of a fastening portion showing an example of an electronic component mounting state using a ground nut and a bolt.
- the attachment piece 41 of the electronic component is overlapped with the attachment location of the vehicle body 42, and the attachment hole 41 a of the attachment piece 41 and the vehicle body 42 are The mounting hole 42a is communicated. Then, the bolt 33 is inserted into the connected mounting holes 41 a and 42 a, and the screw portion 32 of the bolt 33 is screwed into and engaged with the screw hole 22 of the ground nut 11.
- the attachment piece 41 can be fastened and attached to the vehicle body 42.
- the coating film of the thread 31 of the bolt 33 is peeled off by the cutting edge 26 of the ground nut 11, and the ground nut 11 and the bolt 33 are electrically connected.
- the attachment piece 41 is fastened to the vehicle body 42 by the ground nut 11 and the bolt 33, the seat surface protrusion 15 of the seat surface 13 a of the earth nut 11 bites into the surface of the attachment piece 41.
- the coating film provided on the surface of the mounting piece 41 is peeled off, and the mounting piece 41 and the ground nut 11 are electrically connected.
- the seat surface protrusion 15 provided on the seat surface 13a of the ground nut 11 contacts the mounting piece 41. To do. Then, the seat surface protrusion 15 peels off the coating film provided on the attachment piece 41, and electrical conduction is ensured between the ground nut 11 and the attachment piece 41.
- a projection similar to the seating surface projection 15 of the ground nut 11 is formed on the seating surface 34 which is the surface on the vehicle body 42 side of the head 33a of the bolt 33.
- the protrusions bite into the surface of the vehicle body 42 to peel off the coating film on the surface of the vehicle body 42.
- the vehicle body 42 and the bolt 33 are made conductive.
- the head 33a of the bolt 33 may be fixed to the vehicle body 42 in advance by welding or the like and may be conducted.
- the attachment piece 41 is conducted by the conduction circuit C connected to the vehicle body 42 via the ground nut 11 and the bolt 33. Therefore, good electrical continuity can be ensured between the electronic component having the mounting piece 41 and the vehicle body 42.
- the pitch of the thread 21 is shifted with respect to the thread 31 of the bolt 33 to be engaged, and the thread 31 of the bolt 33 is shifted.
- the angle of the thread 21 is large.
- pressure contact part T which the screw threads 21 and 31 contact with high contact pressure is obtained, and a big fastening force can be made to act.
- the notch 25 is formed only in a part on both sides of the screw hole 22 in the axial direction, the strength of the screw thread 21 is not impaired.
- the end face of the thread 21 facing the notch 25 is formed as a cutting edge 26, and the pitch of the thread 21 is shifted with respect to the engaging bolt 33.
- the coating film of the bolt 33 can be reliably peeled off, and conduction with the bolt 33 can be reliably ensured.
- the thread 21 is formed so as to satisfy xP. Thereby, if this earth nut 11 is used, reliable conduction
- the condition of ⁇ is obtained by experiment. In the experiment, when ⁇ is out of this range, the fastening force with the bolt 33 is too weak or the conduction with the bolt 33 cannot be secured.
- the condition of ⁇ is preferably 0.005 ⁇ P ⁇ ⁇ ⁇ 0.08 ⁇ P, more preferably 0.01 ⁇ P ⁇ ⁇ ⁇ 0.05 ⁇ P, and ⁇ is in these ranges. In this case, characteristics such as fastening strength and conduction state are more stable.
- the angle ⁇ [degree] of the thread 21 is expressed as 60 + ⁇ , the thread 21 is formed so that ⁇ satisfies 0 ⁇ ⁇ ⁇ 10. Thereby, if this earth nut 11 is used, the coating film of the thread 31 of the bolt 33 can be favorably peeled off.
- the condition of ⁇ is preferably 2.5 ⁇ ⁇ ⁇ 5, more preferably 3 ⁇ ⁇ ⁇ 4.
- ⁇ is within these ranges, a stable pre-baling torque was obtained even when the bolt 33 was attached and detached several times.
- the coating film of the thread 31 of the bolt 33 is hard, it is preferable to set ⁇ large.
- the notches 25 are formed on both sides of the screw hole 22 in the axial direction.
- the notches 25 may be provided on at least one side of the screw hole 22 in the axial direction. Even in this case, the coating film of the thread 31 of the engaged bolt 33 can be peeled off at the high-pressure contact portion T where the threads 21 and 31 are in firm contact.
- the conduction circuit C with the bolt 33 can be shortened, and the resistance value can be reduced. Can be lowered.
- ground nut 11 Unlike the ground nut 11 according to the present embodiment described above, it is also conceivable that a notch is formed in the welding bolt attached to the vehicle body side to obtain conduction at the time of fastening.
- the notch is formed in the welding bolt, the strength is lowered, and thus it is necessary to prepare two types of bolts for grounding and fastening. For this reason, it is not efficient to attach to the vehicle body while distinguishing between the grounding bolt and the fastening bolt. Therefore, it is preferable to use the ground nut 11 provided with the notch 25 as in this embodiment because a single type of general-purpose welding bolt can be used.
- FIG. 5 is a graph showing the relationship between the tightening torque and the resistance value at the tightening location.
- FIG. 6 is a cross-sectional view of a bolt according to a reference example.
- the broken line L1 in FIG. 5 indicates the ground nut shown in Patent Document 1
- the broken line L2 indicates the bolt according to the reference example
- the broken line L3 indicates the relationship between the tightening torque and the resistance value when the ground nut 11 according to the present embodiment is used. Yes.
- ground nut shown in Patent Document 1 that peels the coating film of a bolt by a deformed portion that is reduced in diameter by applying an external force to the threaded portion
- a fastening force can be applied only at the deformed portion protruding radially inward. Furthermore, it cannot be conducted until the bolt reaches the deformed portion (see the broken line indicated by L1 in FIG. 5).
- this ground nut is unlikely to contact the bolt except at the deformed portion, and it is difficult to apply a large fastening force. For this reason, this ground nut cannot be used for applications requiring a large fastening force. Moreover, since the screw thread is difficult to contact the portion where the coating film of the bolt is shaved, it is difficult to obtain a good conduction state.
- the bolt 33S of the reference example in which the projection 35 similar to the seat projection 15 of the ground nut 11 is formed on the seat surface 34 of the head 33a the bolt 33S is screwed into the nut to some extent. If not inserted, the projection 35 of the seating surface 34 does not come into contact with the coating film on the surface of the mounted part or the like, and the coating film cannot be peeled off.
- the ground nut 11 when tightening torque starts to occur, the threads 21 and 31 come into contact with each other, and peeling of the coating film of the thread 31 of the bolt 33 starts. A good conduction state is obtained (see the broken line indicated by L3 in FIG. 5). For this reason, the ground nut 11 of this embodiment can obtain a good conduction state even if the tightening torque varies. For example, since the strength of the ground nut 11 itself is small, reliable conduction can be expected even when the ground nut 11 has to be used with a low tightening torque.
- FIG. 7 is a cross-sectional view illustrating a forging process of the ground nut.
- a metal wire that is a material of the earth nut 11 is cut into a predetermined length to obtain an intermediate (cutting step).
- an intermediate body made of a wire having a predetermined length is compressed in the axial direction to form a nut shape (forging process).
- a first mold 52 having a nut forming recess 51 and a second mold 54 having a notch forming projection 53 are used.
- the intermediate body 50 is placed in the nut molding recess 51 of the first mold 52, and the second mold 54 is pressed against the first mold 52 for forging.
- the outer shape of the intermediate body 50 is the shape of the ground nut 11 having the head portion 12 and the seat portion 13 by the nut forming recess 51, and the hole portion 50a is formed at the center, and the hole portion 50a A notch 25 is formed at the end in the axial direction.
- tapping is performed with a tap on the inner peripheral surface of the hole 50a of the intermediate body 50 to form the screw hole 22 having the screw thread 21, thereby completing the ground nut 11 (screwing step).
- a notch in the bolt for cutting the painted surface of the thread of the nut is also possible to form a notch in the bolt for cutting the painted surface of the thread of the nut.
- the wire is compressed in the axial direction so that the notch is formed, and a thread is provided on the surface of the intermediate body of the bolt made of the wire having the notch formed.
- the formed rolling die is pressed into a bolt having a threaded portion formed with a thread.
- the end face of the thread that faces the notch is distorted, and a sharp cutting edge is not formed.
- the cross section of the thread 21 facing the notch 25 becomes sharp.
- the cross section of the thread 21 facing the notch 25 can be further sharply formed. Therefore, the coating film of the bolt can be surely peeled off with the cutting edge 26 having a cross section of the sharp thread 21.
- a forging die comprising the first die 52 and the second die 54 described above for forming the notch 25 is prepared, the existing nut manufacturing method and manufacturing equipment can be used to manufacture the ground nut 11. Therefore, the ground nut 11 can be provided at an extremely low cost.
- FIG. 8 is a cross-sectional view of a ground nut according to a modification.
- FIG. 8 shows an earth nut 11A made of a nut with a bag whose side opposite to the bolt insertion side is covered with a hemispherical bag portion 11a.
- the pitch Pn of the screw threads 21 is larger than the pitch P of the screw threads 31 of the bolts 33 for all the screw threads 21 provided in the screw holes 22, and the angle ⁇ of the screw threads 21. Is formed larger than 60 degrees.
- notches 25 are formed on both sides of the screw hole 22 in the axial direction, and the thread 21 facing the notch 25 has a sharp cutting edge 26.
- the notch 25 is provided to form the cutting edge 26, and the pitch of the thread 21 is shifted with respect to the bolt 33 to be engaged.
- the film can be reliably peeled off. Thereby, electrical connection with the bolt 33 can be reliably ensured.
- the contact force between the threads 21 and 31 is increased due to the deviation of the pitch of the threads 21 with respect to the engaging bolt 33 and the large angle of the threads 21 with respect to the bolt 33.
- a high pressure contact portion T is obtained, and a large fastening force can be applied.
- the notch 25 is formed only in a part on both sides of the screw hole 22 in the axial direction, the strength of the screw thread 21 is not impaired.
- the side opposite to the insertion side of the bolt 33 is covered with the bag portion 11a.
- the bag portion 11a it is possible to prevent water from entering from the side opposite to the insertion side of the bolt 33 into the engagement portion of the screw hole 22 with the screw portion 32 of the bolt 33. Therefore, the portion where the coating film is peeled off by the cutting edge 26 and the metal is exposed can be protected by the bag portion 11a to prevent the occurrence of rust.
- 11A can also remove deposits on the thread 31 of the bolt 33 other than the coating film.
- spatter may unintentionally adhere to bolts and nuts.
- ground nuts 11, 11 ⁇ / b> A the attached spatter can be removed by the cutting blade 26 by engaging the bolt 33.
- an earth nut having a large fastening force and capable of reliably obtaining a conduction state with a bolt.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
- Connection Of Plates (AREA)
- Gasket Seals (AREA)
Abstract
Description
ピッチPでねじ山が形成されているボルトに係合されるねじ孔を備えたアースナットであって、
前記ねじ孔に設けられた全てのねじ山について、前記ねじ山のピッチPnはボルトのねじ山のピッチPよりも大きく、かつ、前記ねじ山の角度θ[度]が60度よりも大きく形成されており、
前記ねじ孔の軸方向の一部には、軸方向に延びる切り欠きが設けられ、前記切り欠きに臨むねじ山の端面が切れ刃を形成している。
αが、0<α<0.1×Pを満足することが好ましい。
βが、0≦β≦10を満足することが好ましい。
図1は、本実施形態に係るアースナットの上面図である。図2は、図1におけるII-II断面図である。図3は、アースナットとボルトとの係合箇所の断面図である。
このアースナット11は、例えば、自動車の車体に電子部品を取り付けてアースをとる際に用いられる。アースナット11は、螺合されるボルトとの良好な導通状態を確保するように、ボルトとの螺合時にボルトの防錆用の塗装膜を剥離する機能を有する。
図4は、アースナットとボルトとによる電子部品の取付状態の一例を示す締結箇所の断面図である。
図5は、締付けトルクと締結箇所における抵抗値との関係を示すグラフである。図6は、参考例に係るボルトの断面図である。図5の折れ線L1は特許文献1に示すアースナット、折れ線L2は参考例に係るボルト、折れ線L3は本実施形態に係るアースナット11を用いた場合の締付けトルクと抵抗値との関係を示している。
図7は、アースナットの圧造工程を説明する断面図である。
図8は、変形例に係るアースナットの断面図である。
Claims (9)
- ピッチPでねじ山が形成されているボルトに係合されるねじ孔を備えたアースナットであって、
前記ねじ孔に設けられた全てのねじ山について、前記ねじ山のピッチPnはボルトのねじ山のピッチPよりも大きく、かつ、前記ねじ山の角度θが60度よりも大きく形成されており、
前記ねじ孔の軸方向の一部には、軸方向に延びる切り欠きが設けられ、前記切り欠きに臨むねじ山の端面が切れ刃を形成している、アースナット。 - 前記ねじ山のピッチPnを、ボルトのねじ山のピッチPを用いてP+αと表したとき、
αが、0<α<0.1×Pを満足する、請求項1に記載のアースナット。 - 前記ねじ山の角度θ[度]を、60+βと表したとき、
βが、0≦β≦10を満足する、請求項1または2に記載のアースナット。 - 前記アースナットに締め付けトルクが作用したときにボルトとの導通が確保される、請求項1から3のいずれか一項に記載のアースナット。
- 前記切り欠きは軸方向の少なくとも一方側に設けられている、請求項1から4のいずれか一項に記載のアースナット。
- 前記切り欠きは、ボルトの挿入側に設けられている、請求項5に記載のアースナット。
- 前記切り欠きは、軸方向の両側に設けられている、請求項5または6に記載のアースナット。
- 前記アースナットは袋付きナットである、請求項1から7のいずれか一項に記載のアースナット。
- ボルトと前記ねじ孔との隙間を埋めるシール材が設けられている、請求項1から7のいずれか一項に記載のアースナット。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13857368.8A EP2924303B1 (en) | 2012-11-22 | 2013-03-21 | Grounding nut |
BR112015011771-6A BR112015011771B1 (pt) | 2012-11-22 | 2013-03-21 | porca de aterramento |
US14/646,245 US20150308483A1 (en) | 2012-11-22 | 2013-03-21 | Earthing nut |
ES13857368T ES2735324T3 (es) | 2012-11-22 | 2013-03-21 | Tuerca de conexión a tierra |
RU2015119036A RU2607314C1 (ru) | 2012-11-22 | 2013-03-21 | Заземляющая гайка |
MX2015006523A MX2015006523A (es) | 2012-11-22 | 2013-03-21 | Tuerca de conexicion a tierra. |
CN201380060997.3A CN104968950B (zh) | 2012-11-22 | 2013-03-21 | 接地螺母 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2012-256373 | 2012-11-22 | ||
JP2012256373A JP6261853B2 (ja) | 2012-11-22 | 2012-11-22 | アースナット |
Publications (1)
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WO2014080645A1 true WO2014080645A1 (ja) | 2014-05-30 |
Family
ID=50775840
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2013/058150 WO2014080645A1 (ja) | 2012-11-22 | 2013-03-21 | アースナット |
Country Status (9)
Country | Link |
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US (1) | US20150308483A1 (ja) |
EP (1) | EP2924303B1 (ja) |
JP (1) | JP6261853B2 (ja) |
CN (1) | CN104968950B (ja) |
BR (1) | BR112015011771B1 (ja) |
ES (1) | ES2735324T3 (ja) |
MX (1) | MX2015006523A (ja) |
RU (1) | RU2607314C1 (ja) |
WO (1) | WO2014080645A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5870445B2 (ja) * | 2011-11-18 | 2016-03-01 | ポップリベット・ファスナー株式会社 | アース機能付パイプ取付具 |
CN107091270A (zh) * | 2017-06-23 | 2017-08-25 | 武汉捷众汽车零部件有限公司 | 一种新型汽车用接地螺母 |
JP2020012526A (ja) | 2018-07-19 | 2020-01-23 | 株式会社青山製作所 | 塗膜剥離ナット |
DE102019200240A1 (de) * | 2019-01-10 | 2020-07-16 | Arnold Umformtechnik Gmbh & Co. Kg | Verbindungsmittel zur Herstellung einer elektrisch leitenden Verbindung, Verfahren und Anordnung |
FR3127994B1 (fr) * | 2021-10-12 | 2023-12-01 | Safran Aircraft Engines | Elément de liaison d’un support de palier à un tube de canalisation d’huile et turbomachine équipée d’un tel élément de liaison |
CN115183339A (zh) * | 2022-07-20 | 2022-10-14 | 珠海格力电器股份有限公司 | 空调室外机 |
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- 2013-03-21 ES ES13857368T patent/ES2735324T3/es active Active
- 2013-03-21 WO PCT/JP2013/058150 patent/WO2014080645A1/ja active Application Filing
- 2013-03-21 US US14/646,245 patent/US20150308483A1/en not_active Abandoned
- 2013-03-21 MX MX2015006523A patent/MX2015006523A/es unknown
- 2013-03-21 BR BR112015011771-6A patent/BR112015011771B1/pt active IP Right Grant
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Also Published As
Publication number | Publication date |
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ES2735324T3 (es) | 2019-12-18 |
RU2015119036A (ru) | 2017-01-10 |
MX2015006523A (es) | 2015-11-16 |
EP2924303A4 (en) | 2016-08-24 |
EP2924303A1 (en) | 2015-09-30 |
BR112015011771B1 (pt) | 2020-10-20 |
CN104968950B (zh) | 2018-04-20 |
BR112015011771A2 (pt) | 2017-07-11 |
JP6261853B2 (ja) | 2018-01-17 |
US20150308483A1 (en) | 2015-10-29 |
EP2924303B1 (en) | 2019-05-22 |
CN104968950A (zh) | 2015-10-07 |
JP2014101990A (ja) | 2014-06-05 |
RU2607314C1 (ru) | 2017-01-10 |
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