CN108443288A

CN108443288A - Fastener

Info

Publication number: CN108443288A
Application number: CN201710083961.7A
Authority: CN
Inventors: 孙愉后
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-02-16
Filing date: 2017-02-16
Publication date: 2018-08-24
Anticipated expiration: 2037-02-16
Also published as: CN108443288B

Abstract

A kind of fastener is provided, the fastener includes tightening piece (1) and annular element (2).The annular element includes the second main part (22), flange part (21) and multiple spaced first blocking protrusions (23) of annular, the first blocking protrusion is axially extending from the flange part towards second faying face in the outside of second main part, wherein the outer diameter of the first blocking protrusion is more than the outer diameter of the tightening piece；The wherein described tightening piece and the first blocking protrusion of the annular element are suitable for being combined with wrench device, realize tightening piece dismounting synchronous with the annular element.The fastener of the present invention plays the role of that the further pine of tightening piece is inhibited to move back by the combination of faying face.And damage when avoiding dismounting for faying face.And the structure of the present invention to screw back tightening piece to original position when dismounting, simplifies operation.

Description

Fastener

Technical field

The present invention relates to a kind of combination by tightening piece and the faying face of annular element come realize inhibit tightening piece into one The step fastener that moves back of pine more particularly to a kind of it can realize tightening piece and annular element while tighten or dismantling without between damage The fastener of faying face and its dedicated wrench device.

Background technology

Fastener is applied in all trades and professions of connection fastening demand, such as in vehicle, building machinery, agricultural machine It is all widely used in tool, manufacture machinery etc..For in large-scale engineering machinery or engineering truck, due to working environment it is severe with And the effect of heavy load so that fastener thereon by the vibration of all directions and impacting for load, this make fastener compared with It is easy to loosen, to cause the reduction of fastener function even to fail, causes prodigious security risk.

Currently used fastener locking method generally comprises the locking of non-removable locking scheme and increasing friction force Scheme.Non-removable locking scheme is changed into detachable threaded connection not using welding, bonding or rushing a little modes such as riveting It is detachable to be threadedly coupled.In non-removable locking scheme, fastener cannot be reused, and troublesome in poeration, be usually used in certain It is required that anti-loosening property is high and is not required to the important events of dismounting.The locking scheme of increasing friction force is using increasing between screw thread or bolt The method of the frictional force of (screw) head and nut end face or the frictional force both increased simultaneously is locking to achieve the purpose that.Increase rubs The locking scheme for wiping power is not limited by space, can be dismantled repeatedly, but reliability is poor, is being worked after a certain period of time, meeting Because the reasons such as vibration reduce anti-loosing effect.

Invention content

Technical problem solved by the invention is to provide a kind of fastener, be cooperated by tightening piece and matching for annular element With so that tightening piece is more loose to move back, and screw fastening clamp force is tighter, causes tightening piece that can not loosen, and inhibits tightening piece into one to play The effect that step pine moves back.And no matter which kind of use state is tightening piece be under, is loosened within angular range in maximum, spanner dress Tightening piece and annular element can be inserted in any angle by setting, and tightening piece and annular element are screwed out simultaneously.And avoid dismounting When damage for faying face.And the structure of the present invention to screw back tightening piece to original position when dismounting, simplifies Operation.

According to the embodiment of one aspect of the invention, a kind of fastener is provided, including：Tightening piece is configured to and coordinates Screw rod is combined to fasten by fastener, and the tightening piece includes the first main part of regular prism shape, and the first of the tightening piece The first faying face is provided on end surfaces；And annular element, the annular element are coaxially disposed and are used cooperatively with the tightening piece, The annular element includes：Second main part of annular is provided with the second faying face, institute on the end surface of second main part It states the first faying face to be combined with the second faying face so that the further pine of the tightening piece is hindered to move back when tightening piece pine moves back； Flange part is projected radially outwardly from the end opposite with second faying face of second main part；And multiple intervals The first blocking protrusion being arranged, the first blocking protrusion is in the outside of second main part from described in flange part direction Second faying face is axially extending, wherein the outer diameter of the first blocking protrusion is more than the outer diameter of the tightening piece；It is wherein described to twist First blocking protrusion of tight part and the annular element is suitable for being combined with wrench device, realizes the tightening piece and the annular element Synchronous dismounting.

The embodiment of property according to an example of the present invention, the side of the first blocking number of projection and the regular prism Number is corresponding.

The embodiment of property according to an example of the present invention, wherein first faying face includes at least two first knots Conjunction portion, second faying face include corresponding at least two second engaging portions, and first engaging portion is included in circumferencial direction First oblique faying face of upper extension and the second blocking surface, second engaging portion include that first extended in a circumferential direction is tiltedly tied Conjunction face and the second blocking surface, wherein the first oblique faying face of first engaging portion is configured to the first of the second engaging portion tiltedly Faying face matches contact, and the second blocking surface of first engaging portion is configured to the second blocking surface phase with the second engaging portion Cooperation contact, to realize the combination of tightening piece and the annular element.

The embodiment of property according to an example of the present invention, wherein the position of the first blocking protrusion is configured to work as When second blocking surface of first engaging portion and the second blocking surface of the second engaging portion contact, the first blocking protrusion difference It is symmetrical relative to the plane in radial directions across the incline of regular prism in a circumferential direction.

The embodiment of property according to an example of the present invention, wherein on the circumferencial direction of the annular element, be formed in two The central angle of recess portion between adjacent the first blocking protrusion is more than the described first central angle for stopping protrusion.

The embodiment of property according to an example of the present invention, wherein on the circumferencial direction of the annular element, be formed in two The central angle of recess portion between adjacent the first blocking protrusion is twice of the described first central angle for stopping protrusion.

The embodiment of property according to an example of the present invention, wherein on the circumferencial direction of the annular element, described first Stop that the central angle of protrusion is 20 °.

The embodiment of property according to an example of the present invention, wherein the tightening piece includes：

From the first protrusion of first main part coaxially axially extending annular, first faying face is formed in On the surface far from first main part of first protrusion.

The embodiment of property according to an example of the present invention, wherein first protrusion and second main part Outer diameter is identical.

The embodiment of property according to an example of the present invention, wherein the first oblique faying face of first engaging portion and First oblique faying face of two engaging portions is respectively formed the helicoid with identical lift angle to cooperate, the spiral liter of the helicoid Angle is more than the cooperation screw flight lift angle, the spiralling direction of the helicoid on the second engaging portion of the annular element With the cooperation screw rod to screw direction opposite.

The embodiment of property according to an example of the present invention, wherein the second blocking surface and second of first engaging portion Second blocking surface of engaging portion is identical as the angle of horizontal plane, and is obtuse angle or right angle.

The embodiment of property according to an example of the present invention, wherein the side of the annular element contacted with by fastener Be formed with ratchet, the ratchet be constructed such that annular element and by the frictional force between fastener be more than tightening piece and annular element it Between frictional force so that annular element is remained stationary as relative to by fastener and screw rod when tightening piece is relative to screw bolt loosening.

The embodiment of property according to an example of the present invention, wherein the ratchet is configured to the second side in annular element Surface on be arranged radially.

The embodiment of property according to an example of the present invention, wherein the tightening piece has four-prism shape or positive six Prism shape.

The embodiment of property according to an example of the present invention, wherein the tightening piece is nut, and the nut is matched with described Close screw flight cooperation.

The embodiment of property according to an example of the present invention, wherein the tightening piece includes：Second protrusion, described Two protrusions extend from one end of first protrusion, and second protrusion is contained in the annular element.

The embodiment of property according to an example of the present invention, wherein second protrusion is from the first protrusion diameter To obliquely outward extending；

Second protrusion is matched with the endoporus of the annular element so that the tightening piece is relative to the annular element It rotates but cannot be detached from from the annular element.

The embodiment of property according to an example of the present invention, wherein the endoporus of the annular element is big including the first hole, internal diameter In the second hole of the internal diameter in first hole and the inclined surface in connection first hole and second hole, wherein described first Hole is located at the first side of the close tightening piece of the annular element, and second hole is located at being twisted far from described for the annular element The second side of tight part；The inclined surface is configured to stop second protrusion.

The embodiment of property according to an example of the present invention, wherein second protrusion is from the of the annular element What side was formed through the stamping process after passing through the annular element to reach the second side.

The embodiment of property according to an example of the present invention, wherein the nut is seperated part with the annular element.

The embodiment of property according to an example of the present invention, wherein the tightening piece is bolt head, the bolt head and institute It states cooperation screw rod integrally connected and rotates together.

Embodiment according to an aspect of the present invention provides a kind of wrench device, for any in claim 1-21 Fastener described in realizes tightening piece dismounting synchronous with the annular element, wherein：The wrench device includes：Cylinder The third main part of shape；

It is multiple it is spaced second blocking protrusions, be arranged on the inside of the third main part, and be configured to it is described First blocking protrusion of annular element is in contact cooperation；And

Engaging portion is arranged on the inside of the third main part, and is configured to the regular prism shape phase with the tightening piece The regular prism shape of cooperation；

The internal diameter of the wherein described second blocking protrusion is more than the outer diameter of first main part so that in the wrench device When being attached to the fastener, the second blocking protrusion offsets press-fit so that moving the ring with corresponding first blocking protrusion Shape part.

The embodiment of property according to an example of the present invention, wherein fasten the mistake of the fastener in the wrench device Cheng Zhong, when the side of the second blocking protrusion is pressed against each other with the corresponding side of the first blocking protrusion, the fastener First faying face is tightly coupled to each other with the second faying face, to realize the synchronous rotation of the tightening piece and the annular element.

The embodiment of property according to an example of the present invention, wherein be formed between two first adjacent blocking protrusions Recess portion central angle be more than it is described second stop protrusion central angle.

The embodiment of property according to an example of the present invention, wherein be formed between two first adjacent blocking protrusions Recess portion central angle and it is described second blocking protrusion central angle between difference no more than the tightening piece relative to described The maximum allowable loosening angle of annular element.

The embodiment of property according to an example of the present invention, wherein the second blocking number of projection and the first blocking are prominent The quantity risen is identical, to which when the wrench device is attached to the fastener, the second blocking protrusion is inserted into accordingly Two it is adjacent first blocking protrusions between.

The embodiment of property according to an example of the present invention, wherein circle of the second blocking protrusion in the third main part Central angle in circumferential direction is identical as central angle of the first blocking protrusion on the circumferencial direction of the annular element.

The embodiment of property according to an example of the present invention, wherein circle of the second blocking protrusion in the third main part The central angle of central angle and the first blocking protrusion on the circumferencial direction of the annular element in circumferential direction is 20 °.

The embodiment of property according to an example of the present invention, wherein on the circumferencial direction of third main part, described second Stop the position of protrusion relative to the central point on the regular prism side for passing through the engaging portion in radial directions plane towards fastening The tightening direction of part deviates certain angle.

The embodiment of property according to an example of the present invention, wherein deviation the angle ranging from 10 °.

The embodiment of property, wrench device further comprise according to an example of the present invention：Interconnecting piece, the interconnecting piece shape It in the inside of the third main part, and is configured to be connected with external tool, to turn the wrench device.

The embodiment of property according to an example of the present invention, wherein being formed along the third main part in the interconnecting piece Radially extend the through-hole being inserted into for handle.

The fastener of the various embodiments described above according to the present invention is more than the knot of cooperation screw flight lift angle by lift angle The combination in conjunction face realizes and inhibits the further pine of tightening piece to move back when tightening piece pine moves back, reaches anti-loosing effect；And spanner fills Set any angle within maximum allowable loosening angle and could be incorporated into fastener, tightening piece and annular element are tightened simultaneously or For the damage of faying face when screwing out, and need not screw back tightening piece to original position, simplify operation, and avoiding dismounting It is bad.

Description of the drawings

The present invention with reference to the accompanying drawings to be further described, wherein：

Fig. 1 is the stereoscopic schematic diagram of the decomposition for the fastener for showing a kind of exemplary embodiment according to the present invention；

Fig. 2 is another stereoscopic schematic diagram decomposed for showing fastener shown in Fig. 1；

Fig. 3 is the stereoscopic schematic diagram shown after fastener combination shown in FIG. 1；

Fig. 4 is the partial schematic sectional view shown before fastener combination shown in FIG. 1；

Fig. 5 is the partial schematic sectional view shown after fastener combination shown in FIG. 1；

Fig. 6 is the schematic top plan view for showing fastener shown in fig. 5；

Fig. 7 is the stereoscopic schematic diagram for the annular element for showing fastener shown in FIG. 1；

Fig. 8 is the partial schematic sectional view for showing annular element shown in Fig. 7；

Fig. 9 is the schematic top plan view for showing annular element shown in Fig. 8；

Figure 10 is the partial schematic sectional view for the tightening piece for showing fastener shown in FIG. 1；

Figure 11 is the schematic top plan view for the tightening piece for showing fastener shown in Fig. 10；

Figure 12 is the geometrical principle figure of the helix angle for the first faying face for showing tightening piece shown in FIG. 1；

Figure 13 is the geometry of the externally threaded helix angle for the screw rod for showing to coordinate with the tightening piece of the embodiment of the present invention Schematic diagram；

Figure 14 is the stereoscopic schematic diagram for showing the wrench device for dismantling the fastener；

Figure 15 is the schematic cross-sectional view for showing wrench device shown in Figure 14；

Figure 16 is to show that the right side of wrench device shown in figure 15 regards schematic diagram；

Figure 17 is the left view schematic diagram for showing wrench device shown in Figure 17.And

Figure 18 is the decomposition diagram for showing fastener according to another exemplary embodiment of the present invention,.

Specific implementation mode

Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.Illustrating In book, same or analogous drawing reference numeral indicates same or analogous component.Following reference attached drawings are to embodiment of the present invention Illustrate to be intended to explain the present general inventive concept of the present invention, and is not construed as a kind of limitation to the present invention.

In addition, in the following detailed description, for ease of explaining, elaborating many concrete details to provide to present disclosure The comprehensive understanding of embodiment.It should be apparent, however, that one or more embodiments without these specific details can also It is carried out.In other cases, well known construction and device is diagrammatically embodied to simplify attached drawing.

Inventive concept generally according to the present invention provides a kind of fastener, including：Tightening piece, be configured to Screw rod is coordinated to combine to fasten by fastener, the tightening piece includes the first main part of regular prism shape, the tightening piece The first faying face is provided on first end surfaces；And annular element, the annular element are coaxially disposed and coordinate with the tightening piece It uses, the annular element includes：Second main part of annular is provided with the second combination on the end surface of second main part Face, first faying face are combined with the second faying face so that the further of the tightening piece is hindered when tightening piece pine moves back Pine moves back；Flange part is projected radially outwardly from the end opposite with second faying face of second main part；And it is multiple Spaced first blocking protrusion, the first blocking protrusion is in the outside of second main part from the flange part direction Second faying face is axially extending, wherein the outer diameter of the first blocking protrusion is more than the outer diameter of the tightening piece.Wherein institute The the first blocking protrusion for stating tightening piece and the annular element is suitable for being combined with matched wrench device, realizes the tightening piece Dismounting synchronous with the annular element.

According to an exemplary embodiment, fastener of the invention can be applied in Work machine, be used for example as engineering The connector of creeper tread, chassis member in vehicle.Due to the severe applying working condition of Work machine, in use have compared with The generation of big vibration and larger load, especially transverse load is so that the tightening piece in fastener can be with usage time Passage and loosen.

It will be appreciated by those of skill in the art that the annular element can make by using various measures its with by between fastener It forms larger frictional force, and annular element and the friction between tightening piece and annular element is more than by the frictional force between fastener Power.In this way, under certain outer force effect, remained stationary as relative to annular element when being loosened by fastener in tightening piece.

According to an embodiment of the present, the tightening piece has four-prism shape, regular hexagonal prism shape or other positive ribs Post shapes.As shown in figs. 1-11, the tightening piece is nut 1, the nut and the screw rod 100 (Figure 13) screw-thread fit.Spiral shell Mother 1 can be the common nut such as tetragonal nut, hex nut.In another embodiment, as shown in figure 18, the tightening piece is Bolt head 200, the bolt head 200 201 integrally connected of screw rod and are rotated together with cooperation.In this way, bolt head 200 and screw rod 201 constitute a bolt.Bolt head 200 can be quadrangle bolt head, hexagonal bolt head or other common bolt head shapes.

Referring to Fig. 1-17, the fastener of the embodiment of the present invention is described so that tightening piece is nut as an example.

The embodiment of property according to an example of the present invention, the fastener include：It is configured to the tightening piece 1 of nut, institute Nut is stated to be configured to be combined to fasten by fastener (not shown) with cooperation screw rod 100, if Fig. 2 goes out, the tightening piece packet The first main part 11 of regular prism shape is included, the first faying face (nut in Fig. 2 is provided on the first end surfaces of the tightening piece Upper end face)；And annular element 2, the annular element 2 are coaxially disposed and are used cooperatively, the annular element with the tightening piece 1 2 include：It is (annular in Fig. 1 to be provided with the second faying face on the end surface of second main part for second main part 22 of annular The upper end face of part 2), first faying face is combined with the second faying face so that described twist is hindered when tightening piece pine moves back The further pine of tight part moves back；Flange part 21, the flange part 21 is from second main part 22 and the second faying face phase To end project radially outwardly；And multiple spaced first blocking protrusions 23, the first blocking protrusion is described The outside of second main part is axially extending from the flange part towards second faying face, wherein the first blocking protrusion Outer diameter is more than the outer diameter of the tightening piece；The wherein described tightening piece and the first blocking protrusion of the annular element 2 are suitable for and matching The wrench device 3 (being shown in Figure 14-17) of conjunction is combined, and realizes tightening piece dismounting synchronous with the annular element.

The wrench device 3 may be implemented when fastener is installed for tightening piece 1 and annular element 2 synchronize tighten, simultaneously It can also be used for being realized in disassembly of fastener for the dismounting synchronous with annular element 2 of tightening piece 1, without damaging tightening piece 1 and ring Faying face between shape part 2.Specific mode of operation will be described later.

The embodiment of property according to an example of the present invention, the first blocking protrusion include that at least two first blockings are prominent 23 are played, described at least two first blocking protrusions 23 are uniformly divided along the circumferencial direction of the radial outer side of second main part 22 Cloth.The embodiment of property according to an example of the present invention, the number of edges of the quantity and the regular prism of the first blocking protrusion 23 It is corresponding.For example, when the nut tightening piece 1 is positive tetragonal nut, the first blocking number of projection may be configured as 4, when When the nut tightening piece 1 is positive hex nut, the first blocking number of projection may be configured as 6.

The embodiment of property according to an example of the present invention, as shown in Figure 1, 2, first faying face include at least two First engaging portion, second faying face include corresponding at least two second engaging portions, and first engaging portion is included in circle The the first oblique faying face 121 and the second blocking surface 122 extended in circumferential direction, second engaging portion include prolonging in a circumferential direction The the first oblique faying face 221 and the second blocking surface 222 stretched, wherein the first oblique faying face 121 of first engaging portion is constructed It is contacted at being matched with the first of the second engaging portion the oblique faying face 221, the second blocking surface 122 of first engaging portion is constructed It matches and contacts at the second blocking surface 222 with the second engaging portion, to realize the combination of nut and the annular element.

Figure 12 is the geometrical principle figure of the helix angle for the first faying face for showing nut.Figure 13 is shown and the present invention The geometrical principle figure of the externally threaded helix angle of the screw rod of the nut cooperation of embodiment.Property according to an example of the present invention Embodiment, the first oblique faying face 121 of the first faying face and the first oblique faying face 221 of the second faying face are respectively formed with identical The helicoid of lift angle is to cooperate.In fig. 12, the right part of Figure 12 shows to be that the developed dimension relationship of helicoid is shown It is intended to.φ is the helix angle of the first oblique faying face 121 and 221.Ph is the climbing height of helicoid, and D is the central diameter of helicoid. In fig. 13, α is the externally threaded lead angle of the screw rod 100 coordinated with the nut of the embodiment of the present invention, and d is the spiral shell of screw rod Line major diameter, d1 are screw flight path, and d2 is screw flight central diameter.Since nut 1 and screw rod coordinate, the interior spiral shell of nut 1 The helix angle of line is also α.

A kind of exemplary embodiment according to the present invention, as shown in Figure 1, 2, the first oblique faying face of first engaging portion 121 and second first oblique faying face 221 of engaging portion be respectively formed the helicoid with identical lift angle to cooperate.Helicoid Helix angle φ is more than the screw flight lift angle α, the spiral of the helicoid on the second engaging portion of the annular element 2 Direction and the screw rod screw the direction i.e. internal thread of nut to screw direction opposite.In this way, in annular element 2 relative to spiral shell Bar 100 is static and nut 1 relative to screw rod 100 with screw flight side in the opposite direction on the feelings that rotate by a certain angle Under condition, 1 outside of nut is more than relative to climb altitude of the annular element 2 on axis direction (upwardly direction in Fig. 1) in nut Height is moved back in side relative to the pine of screw flight (upwardly direction in Fig. 1) in the axial direction, due to screw rod, annular element and by Fastener is static, so that nut 1 stretches matched screw rod, i.e., nut further compresses annular element so that ring Shape part is further compressed by fastener.Therefore, annular element has the function of lock washer.

Those skilled in the art it is also understood that corresponding to fastener different helix angles, screw connector The lead angle of internal thread will also adjust accordingly.

The embodiment of property according to an example of the present invention, as shown in figure 3, the position of the first blocking protrusion 23 is set It is set to when the second blocking surface 222 of the second blocking surface 122 of first engaging portion and the second engaging portion contacts, described first Stop that protrusion 23 is symmetrical relative to the plane in radial directions across the incline of regular prism in a circumferential direction.

The embodiment of property according to an example of the present invention, picture 1-4, shown in 9, in the circumferencial direction of the annular element 2 On, the central angle β for being formed in the recess portion 24 between two adjacent the first blocking protrusions 23 is more than the first blocking protrusion 23 central angle γ.

It is adjacent to be formed in two on the circumferencial direction of the annular element 2 for the embodiment of property according to an example of the present invention It is described first blocking protrusion 23 between recess portion 24 central angle β be it is described first stop protrusion 23 central angle γ two Times.

The embodiment of property according to an example of the present invention, on the circumferencial direction of the annular element 2, first blocking The central angle γ of protrusion 23 is 20 °.

The embodiment of property according to an example of the present invention, the tightening piece include from first main part 11 coaxially First protrusion 12 of axially extending annular, as shown in Fig. 2, first faying face is formed in first protrusion 12 On surface far from first main part 11.The embodiment of property according to an example of the present invention, first protrusion 12 It is identical with the outer diameter of second main part 22.

The embodiment of property according to an example of the present invention, in order to enable when nut and the installation of annular element 2 combine, it is described Second blocking surface 122,222 is abutted against to realize being mutually located for nut and annular element 2, and prevent nut 1 with cooperation spiral shell The screw thread of bar screws rotation of the identical direction in direction relative to annular element 2, second blocking surface 122,222 and horizontal plane Angle it is identical, and be disposed as obtuse angle or right angle.

The embodiment of property according to an example of the present invention, as shown in Fig. 2, the annular element 2 is close by tightening member Side surface on be formed with ratchet 212, the ratchet 212 is constructed such that annular element 2 and by the friction between fastener Power is more than the frictional force between nut 1 and annular element 2, so that annular element 2 is relative to quilt when nut 1 is relative to screw bolt loosening Fastener and screw rod remain stationary as.

A kind of exemplary embodiment according to the present invention, the ratchet 212 are configured to as shown in Figure 2 in the close of annular element It is arranged radially on the surface of the side of fastener.The number of the radial ratchet is more than the first engaging portion and matched The quantity of second engaging portion, the ratchet of compact arranged radial setting make annular element 2 and larger by being generated between fastener Frictional force, which is more than frictional force between nut 1 and annular element 2 so that in nut loosening annular element 2 relative to It is remained stationary as by fastener.

A kind of exemplary embodiment according to the present invention, the tightening piece include the second protrusion 13, second protrusion Portion 13 extends from one end of first protrusion 12, and second protrusion 13 is accommodated in the annular element as shown in Figure 5 In.

A kind of exemplary embodiment according to the present invention, the nut 1 is configured to the two with the annular element 2 can not It is kept completely separate.

A kind of exemplary embodiment according to the present invention, second protrusion 13 from first protrusion radially outward Obliquely extend.Second protrusion 13 is matched with the endoporus of the annular element so that the tightening piece relative to The annular element is rotated but cannot be detached from from the annular element 2.

The endoporus of a kind of exemplary embodiment according to the present invention, the annular element is more than institute including the first hole 201, internal diameter The second hole 202 of the internal diameter in the first hole and the inclined surface 203 in connection first hole and second hole are stated, wherein described the One hole is located at the first side of the close tightening piece of the annular element, and second hole is located at the separate described of the annular element The second side of tightening piece；The inclined surface is configured to stop second protrusion 13.As shown in figure 5, described second Protrusion 13 is matched with the inclined surface 203 so that the tightening piece rotates relative to the annular element but cannot be from described Annular element is detached from.Second protrusion 13 has larger outer of the internal diameter in the first hole 201 of annular element 2 such as shown in fig. 5 Diameter.In this way, the second protrusion 13 is resisted against on inclined surface 203 as shown in Figure 5 so that the nut is relative to the annular element It rotates but cannot be detached from from the annular element.In one embodiment, by be arranged the second protrusion 13 in the axial direction with The height for being formed in the gap between the inclined surface 203 in annular element 2 is less than the first and second blocking surfaces in the axial direction Height, can make nut 1 can only relative to annular element 2 rotate predetermined angular range, to limit matched screw rod by spiral shell The distance that mother 1 stretches in the axial direction, is, for example, less than 1.0mm, to protect fastener not to be damaged, the predetermined angular range It may be configured as the maximum allowable loosening angle of fastener, i.e. maximum allowable loosening angle of the fastener relative to the tightening piece.It should The maximum allowable strength degree for loosening angle and for example can correspond to cooperation screw rod.Specifically, according to the ... of the embodiment of the present invention In fastener, since the first oblique faying face 121 of the first engaging portion is configured to the first oblique faying face 221 with the second engaging portion Contact is matched, the second blocking surface 122 of first engaging portion is configured to 222 phase of the second blocking surface with the second engaging portion Cooperation contact.In this way, when nut 1 leaves blocking surface and rotated relative to annular element 2, nut 1 will be gradually distance from annular element 2, but Due to the limitation of the second protrusion 13 and the inclined surface 203 of annular element 2, nut 1 can only rotate predetermined angular relative to annular element 2 Range.In one embodiment, the maximum angle ranging from 30-70 degree that nut is rotated relative to annular element, preferably 40-70 degree.

A kind of exemplary embodiment according to the present invention, second protrusion 13 be first protrusion 13 from What the first side of the annular element was formed through the stamping process after passing through the annular element to reach the second side.

According to an exemplary embodiment, the nut 1 and the annular element 2 or seperated part, only when in use Ability temporary fit uses.

1-13 describes the locking mechanism of nut fastener according to an embodiment of the invention below in conjunction with the accompanying drawings.

When by the fastener of the embodiment of the present invention for example applied to engineering truck for fastening by fastener, by 1 He of nut Annular element 2 is aligned, i.e., so that the second blocking surface 122 of the first engaging portion is matched with the second blocking surface 222 of the second engaging portion, To prevent nut from screwing rotation of the identical direction in direction relative to annular element with cooperation screw rod.In the rotation with cooperation screw rod 1 entirety of fastener is tightened onto by fastener by the tight identical direction in direction, is applied pretightning force and will be clamped fastening by fastener.

The pine that will produce nut 1 with the passage of usage time moves back.It is big due to annular element 2 and by the frictional force between fastener Frictional force between nut and annular element, when nut 1 is relative to 2 preliminary motion of annular element, annular element 2 relative to screw rod with And it is remained stationary as by fastener.The preliminary motion be along the first engaging portion for matching contact the first oblique faying face 121 with What the first oblique faying face 221 of the second engaging portion carried out.As shown in Figures 12 and 13, since the first oblique faying face 121 and first is oblique Faying face 221 is formed as helicoid, and the helix angle of the helicoid is more than the screw flight lift angle.Then moved back in nut pine When, in the case where pine moves back and turns an angle, since the first protrusion and main part of nut are along the first oblique faying face 121 and 221 move along helix angle direction, and the climbing height on the outside of nut is more than the inside thread of nut from matched screw rod The height exited on 100 external screw thread, to form the stretching for matched screw rod.Therefore, in the internal thread of nut and Coordinate the coupling mechanism force for forming bigger at the externally threaded mating connection of screw rod, the coupling mechanism force that the further pine of nut 1 is inhibited to move back. And matched screw rod generates the opposite pulling force towards annular element 2 to nut 1 so that nut 1 is downwardly against the annular Part 2, annular element 2 are further compressed by fastener, therefore annular element 2 and by the frictional force bigger between fastener, inhibit fastening The movement of part.It is moved back in this way, nut is more loose, generate the stretching of screw rod is got over due to helix angle and the difference of lead angle Greatly, to which coupling mechanism force is bigger, nut is caused to be less susceptible to loosen.

Exemplary embodiment according to an aspect of the present invention provides a kind of wrench device 3 as shown in figures 14-17, For above-mentioned fastener, tightening piece dismounting synchronous with the annular element is realized, wherein：The wrench device includes： The third main part 31 of tubular；Multiple spaced second blocking protrusions 320, are arranged on the inside of the third main part, and It is configured to the cooperation that is in contact with the first blocking protrusion of the annular element；And engaging portion 33, it is arranged in the third main body On the inside of portion, and it is configured to and the matched regular prism shape of the regular prism shape of the tightening piece；Wherein described second blocking The internal diameter of protrusion is more than the outer diameter of the second main part of the fastener so that is attached to the fastener in the wrench device When, the second blocking protrusion offsets press-fit so that moving the annular element with corresponding first blocking protrusion.

In one embodiment, during the wrench device fastens the fastener, the second blocking protrusion When 320 side is pressed against each other with the corresponding side of the first blocking protrusion 23, the first faying face and the second knot of the fastener Conjunction face is tightly coupled to each other, at this point, the first tiltedly combination of the first oblique faying face 121 of first engaging portion and the second engaging portion Face 221 is in contact with each other, and the second blocking surface 122 of first engaging portion connects each other with the second blocking surface 222 of the second engaging portion It touches, to realize the synchronous rotation of the tightening piece and the annular element.In this way, engaging portion applies screwing force, the second resistance to nut It keeps off protrusion pair first and stops that protrusion applies actuating power, tightened while realizing the two, and avoid and only pass through in fastener cycle The compressing contact of first blocking surface and the second blocking surface and both realize while, tightens, avoid for the first blocking surface and the The damage of two blocking surfaces.And it can so that the tightening piece and the annular element are in when fastener is in tightening state Best combination state, i.e. tightening piece are not loosened relative to annular element.

The embodiment of property according to an example of the present invention is formed in recessed between adjacent two first blockings protrusions 23 The central angle β in portion 24 is more than the described second central angle for stopping protrusion 320.Simultaneously so that the central angle β of the recess portion 24 is more than institute State the central angle of the second blocking protrusion 320 so that during wrench device is attached on fastener, if the second blocking is prominent 320 tops that the first blocking protrusion 23 is resisted against on the axial direction of fastener are played, then returning to tightening direction, that is, tightening piece 1 Therefore position direction rotary spanner device, simplifies operation without the initial position being returned to completely when tightening piece 1 does not loosen And it avoids during return due to the damage caused by the first faying face and the second faying face there are prodigious coupling mechanism force.

The embodiment of property according to an example of the present invention, the recess portion being formed between two first adjacent blocking protrusions Difference between 24 central angle β and the central angle of the second blocking protrusion 320 is no more than the tightening piece relative to described The maximum allowable loosening angle of annular element.I.e. the difference be less than in order not to damage the faying face between tightening piece 1 and annular element 2 with And the maximum allowable loosening angle set no more than the stretching tolerance limit of cooperation screw rod, the maximum allowable loosening angle is for example It is 60 °.So that small in the maximum angle that wrench device drives tightening piece 1 to be rotated relative to annular element 2 in disassembly process In the maximum allowable loosening angle, to cause to damage to faying face due to the operation in disassembly process.Shown with Fig. 1-3 For the hex nut gone out, according to an exemplary embodiment, circumference of the second blocking protrusion 320 in the third main part The central angle of central angle and the first blocking protrusion 23 on the circumferencial direction of the annular element on direction is 20 °.And according to One exemplary embodiment, the central angle for being located at the recess portion 24 between two first blocking protrusions 23 is 40 °, described for accommodating Second blocking protrusion 320.And since the central angle of the second blocking protrusion 320 is 20 °, the second blocking protrusion 320 is recessed The maximum angle rotated relative to annular element 2 in portion 24 is 40 ° -20 °, i.e., 20 °.

A kind of exemplary embodiment according to the present invention, wherein the quantity of the second blocking protrusion 320 and the first resistance The quantity for keeping off protrusion 23 is identical, to which when the wrench device is attached to the fastener, the second blocking protrusion 320 is inserted Enter between corresponding two adjacent first blocking protrusions 23.

A kind of exemplary embodiment according to the present invention, as shown in Fig. 1,14,17, the second blocking protrusion is in the third Central angle on the circumferencial direction of main part is identical as central angle of the first blocking protrusion on the circumferencial direction of the annular element.

A kind of exemplary embodiment according to the present invention, for hex nut, the second blocking protrusion 320 is in the third Central angle and central angle of the first blocking protrusion 23 on the circumferencial direction of the annular element on the circumferencial direction of main part is equal It is 20 °.

The embodiment of property according to an example of the present invention, as shown in figure 17, on the circumferencial direction of third main part, institute The position of the second blocking protrusion (320) is stated relative in radial directions across the central point on the regular prism side of the engaging portion The tightening direction of plane towards fastener deviates certain angle.

The embodiment of property according to an example of the present invention, deviation the angle ranging from 10 °.

The embodiment of property according to an example of the present invention, wherein the wrench device further comprises：Interconnecting piece 34, institute It states interconnecting piece and is formed in the inside of the third main part 31, and be configured to be connected with external tool, to turn described pull Arm device.

The embodiment of property according to an example of the present invention, as shown in figure 15, the interconnecting piece are formed in the third master The inside in body portion 31, and be configured to be connected with external tool, to turn the wrench device.

The embodiment of property according to an example of the present invention is formed in the interconnecting piece along described the as shown in figure 15 Three main parts radially extend the through-hole being inserted into for handle.

A kind of exemplary embodiment according to the present invention, as seen in figs. 15-17, the engaging portion is formed as hexagonal configuration.

A kind of exemplary embodiment according to the present invention, as seen in figs. 15-17, the interconnecting piece is formed as square shape.

The operating process tightened and dismantled to fastener using wrench device 3 is detailed below：

When tightening, it is inserted in annular element 2 first, and makes it combine the regular prism in portion 33 and tightening piece 1 using wrench device 3 Lateral surface match and screw in tightening piece 1, until the second blocking surface 122 and the annular element 2 of the first engaging portion of tightening piece 1 The second blocking surface 222 of the second engaging portion abut against.At this point, according to an exemplary embodiment, as shown in figure 3, for example For hex nut, since the second blocking protrusion 320 and first stops that the central angle of protrusion is 20 °, and described the One blocking protrusion 23 is symmetrical relative to the sagittal plane where the incline of corresponding regular prism in a circumferential direction, i.e., the first blocking Protrusion 23 is respectively 10 ° relative to the both sides angle of the sagittal plane where incline, then the second resistance of the first engaging portion of tightening piece 1 When block face 122 and the second blocking surface 222 of the second engaging portion of annular element 2 abut against, the positive rib relative to the engaging portion 33 Sagittal plane where the central point on column side deviate being located under tightening direction of 10 ° of the second blocking protrusion 320 towards tightening direction The side of trip and the side of the first blocking protrusion 23 positioned at tightening direction downstream abut against and (are shown in phantom in figure 6 The side of one of them second blocking protrusion 320 and the first blocking protrusion 23 abuts against, wherein described second stops protrusion 320 Deviate the sagittal plane where the central point on the regular prism side angle be 10 °), to by the wrench device 3 into One step realizes tightening for tightening piece 1 and annular element 2 along the rotation of tightening direction, realizes the preload of fastener.

When proceeding by dismounting, due to the loosening of nut in use, the second blocking surface 122 of nut is separate Second blocking surface 222 of the second engaging portion of annular element 2, nut have relative to annular element 2 along the first oblique faying face 221,121 opposite movement.At this point, being inserted in the wrench device 3 so that the engaging portion 33 of wrench device 3 and regular prism shape The lateral surface of the tightening piece of shape is combined, and wrench device 3 is moved towards fastener, if the second blocking protrusion of wrench device 3 320 do not stop that then the second blocking protrusion 320 enters corresponding two adjacent first by the first blocking protrusion 23 of annular element Between blocking protrusion 23；If the second blocking protrusion is stopped by the first blocking protrusion, direction is being screwed with cooperation screw rod Rotary spanner device 3 on identical direction so that nut along moving in the opposite direction with the pine side of moving back, until wrench device 3 Second blocking protrusion second blocking protrusion 320 enter corresponding two it is adjacent first blocking protrusions 23 between, backward dismounting Direction rotary spanner device 3, until the second blocking protrusion 320 compresses corresponding first blocking positioned at the downstream of disassembly direction In protrusion 23, and the annular element 2 and nut are turned with further rotating for the wrench device 3, by nut 1 and ring Shape part 2 synchronizes dismounting.Illustrate as an example, according to an example of the present invention the embodiment of property, for hex nut, Since angle of the recess portion 24 between two first blocking protrusions 23 on annular element on the circumferencial direction of annular element is 40 °, and The second blocking protrusion 320 is 20 ° in the angle of circumferencial direction, then the second blocking protrusion 320 is being compressed positioned at dismounting side Before in the first blocking protrusion 23 downstream, maximum rotation angle of the second blocking protrusion 320 in recess portion in a circumferential direction Degree is 20 °, i.e., the maximum angle that wrench device drives tightening piece 1 rotate relative to annular element 2 is 20 °, the angle less than in order to It the faying face that does not damage between tightening piece 1 and annular element 2 and is set most no more than the stretching tolerance limit of cooperation screw rod It is big to allow to loosen angle.

It will be understood by those skilled in the art that above-mentioned use hex nut as an example, the example is exemplary rather than limit Property processed, according to different nut style and it is different apply needs, the regular prism number of edges of nut, the first blocking protrusion and the The central angle of two blocking number of projection, the central angle of the first blocking protrusion and the second blocking protrusion and recess portion respectively can basis It needs and specifically sets.For example, position of the first blocking protrusion 23 on the lateral surface of the second main part can be different from and show The embodiment gone out, can be arranged any position on the circumferencial direction of lateral surface, and quantity also need not be with the number of edges of regular prism It is corresponding.And first stops that the central angle of protrusion 23 and the central angle of recess portion 24 can also change, and it is prominent that the first blocking can be arranged 22 smaller or larger central angle is played, as long as tightening and do not damaging faying face and fastening for fastener can be realized The dismounting for fastener is realized on the basis of part.It as a same reason, can be relative to for the second blocking protrusion 320 Sagittal plane where the central point on the side of positive seamed edge is deviateed, and can not also be done and be deviateed, and is filled in the spanner as long as can realize During setting the fastening fastener, when first blocking surface and the second blocking surface contact, the second blocking protrusion Side with first blocking protrusion corresponding side be pressed against each other, to realize the synchronous rotation of the tightening piece and the annular element .

In the process, external tool can be used to be inserted into the interconnecting piece 34, to be pulled via described by external tool Arm device is tightened or is dismantled to the fastener.

Using the wrench device, no matter which kind of use state nut is under, is loosened within angular range in maximum, this is pulled Arm device can be inserted in nut and annular element in any angle, and nut and annular element are screwed out simultaneously.And avoid dismounting When damage for faying face.And the structure of the present invention to screw back tightening piece to original position when dismounting, simplifies Operation.Damage when avoiding dismounting simultaneously for faying face.And the wrench device is used, the peace of fastener both may be implemented Dress pre-tightens, and the dismounting of fastener may be implemented.

Figure 18 is the decomposition diagram for showing fastener according to another exemplary embodiment of the present invention,.Shown in Figure 18 Fastener 20 and Fig. 1-11 shown in fastener 10 the difference is that, in the fastener 20 shown in Figure 18, tightening piece For with 201 integrally connected of screw rod and the bolt head 200 that is rotated together with screw rod 201.

Referring to Figure 18, fastener 20 includes bolt and annular element 2, and bolt includes integrally connected and the bolt head rotated together 200 and the screw rod 201 with threaded portion.The first faying face is formed on the first end surfaces (lower surface in Figure 18) of bolt head. Annular element 2 is coaxially disposed with bolt head, and screw rod 201 passes through the through-hole of annular element.First faying face is combined with second Face is combined so that the further pine of the bolt head 200 is hindered to move back when 200 pine of bolt head moves back.

In the fastener 20, the second faying face of the structure of annular element, the first faying face of bolt head and annular element Structure and combination in fastener shown in Fig. 1-11 structure and combination it is identical, details are not described herein.

The above wrench device is equally applicable to the installation and removal of the fastener 20, for the fastener 20 Installation, disassembly process are identical as the installation of fastener 10, disassembly process, and details are not described herein.

Fastener according to the above-mentioned various embodiments of the present invention is made by the mating reaction of tightening piece and annular element Tightening piece is more loose moves back, screw fastening clamp force is tighter, causes tightening piece that can not loosen, and inhibits the further pine of tightening piece to move back to play Effect.And no matter which kind of use state nut is under, is loosened within angular range in maximum, the wrench device is any Angle can be inserted in nut and annular element, and nut and annular element are screwed out simultaneously.And for faying face when avoiding dismounting Damage.And the structure of the present invention to screw back tightening piece to original position when dismounting, simplifies operation.It avoids simultaneously The dismounting of damage when to(for) faying face.

It will be understood to those skilled in the art that embodiment described above is all exemplary, and this field Technical staff can make improvements, the rushing in terms of not recurring structure or principle of the structure described in various embodiments It can be freely combined in the case of prominent.

After the preferred embodiment that the present invention will be described in detail, those skilled in the art can be apparent from, It does not depart from the protection domains of appended claims and spirit is lower can carry out various change and change, and the present invention is also not only restricted to The embodiment of examples cited embodiment in bright book.

Claims

1. a kind of fastener, including：

Tightening piece (1) is configured to be combined to fasten by fastener with cooperation screw rod, and the tightening piece includes regular prism shape First main part (11) is provided with the first faying face on the first end surfaces of the tightening piece；And

Annular element (2), the annular element are coaxially disposed and are used cooperatively with the tightening piece, and the annular element includes：

The second main part (22) of annular, is provided with the second faying face on the end surface of second main part, and described first Faying face is combined with the second faying face so that the further pine of the tightening piece is hindered to move back when tightening piece pine moves back；

Flange part (21) is projected radially outwardly from the end opposite with second faying face of second main part (22)； And

Multiple spaced first blocking protrusions (23), the first blocking protrusion is in the outside of second main part from institute State that flange part is axially extending towards second faying face, wherein the outer diameter of the first blocking protrusion is more than the tightening piece Outer diameter；

The wherein described tightening piece and the first blocking protrusion of the annular element are suitable for being combined with wrench device, are tightened described in realization Part dismounting synchronous with the annular element.

2. fastener according to claim 1, wherein

The first blocking number of projection is corresponding with the number of edges of the regular prism.

3. fastener according to claim 2, wherein first faying face includes at least two first engaging portions, institute It includes corresponding at least two second engaging portions to state the second faying face, and first engaging portion includes extending in a circumferential direction First oblique faying face and the second blocking surface, second engaging portion include the first oblique faying face extended in a circumferential direction and Two blocking surfaces, wherein the first oblique faying face of first engaging portion is configured to the first oblique faying face phase with the second engaging portion Cooperation contact, the second blocking surface of first engaging portion are configured to the second blocking surface matching splice grafting with the second engaging portion It touches, to realize the combination of tightening piece and the annular element.

4. fastener according to any one of claim 1-3, wherein the position of the first blocking protrusion is configured to When the second blocking surface of the second blocking surface of first engaging portion and the second engaging portion contacts, the first blocking protrusion point It is not symmetrical relative to the plane in radial directions across the incline of regular prism in a circumferential direction.

5. fastener according to claim 4, wherein on the circumferencial direction of the annular element, it is adjacent to be formed in two The central angle of recess portion (24) between the first blocking protrusion is more than the described first central angle for stopping protrusion.

6. fastener according to claim 5, wherein on the circumferencial direction of the annular element, it is adjacent to be formed in two The central angle of recess portion between the first blocking protrusion is twice of the described first central angle for stopping protrusion.

7. fastener according to claim 6, wherein on the circumferencial direction of the annular element, first blocking is prominent The central angle risen is 20 °.

8. fastener according to claim 1, wherein the tightening piece includes：

From the first protrusion (12) of first main part (11) coaxially axially extending annular, the first faying face shape At on the surface far from first main part of first protrusion (12).

9. fastener according to claim 8, wherein first protrusion (12) and second main part (22) Outer diameter is identical.

10. fastener according to claim 3, wherein the first oblique faying face of first engaging portion and second combines The first oblique faying face in portion is respectively formed the helicoid with identical lift angle to cooperate, and the helix angle of the helicoid is more than The cooperation screw flight lift angle, the spiralling direction of the helicoid on the second engaging portion of the annular element with it is described Cooperation screw rod to screw direction opposite.

11. fastener according to claim 3, wherein the second blocking surface of first engaging portion and the second engaging portion The second blocking surface it is identical as the angle of horizontal plane, and be obtuse angle or right angle.

12. fastener according to claim 1, wherein the annular element is formed with the side contacted by fastener Ratchet, the ratchet are constructed such that annular element and are more than rubbing between tightening piece and annular element by the frictional force between fastener Power is wiped, so that annular element is remained stationary as relative to by fastener and screw rod when tightening piece is relative to screw bolt loosening.

13. fastener according to claim 12, wherein the ratchet is configured on the surface of the second side of annular element On be arranged radially.

14. fastener according to claim 1, wherein the tightening piece has four-prism shape or regular hexagonal prism shape Shape.

15. according to claim 1-14 any one of them fasteners, wherein the tightening piece is nut, the nut and institute State cooperation screw flight cooperation.

16. fastener according to claim 8, wherein the tightening piece includes：

Second protrusion (13), second protrusion (13) extend from one end of first protrusion (12), and described second Protrusion is contained in the annular element.

17. fastener according to claim 16, wherein second protrusion (13) is from first protrusion (12) Extend with being radially outwardly sloping；

Second protrusion (13) matches with the endoporus of the annular element so that the tightening piece is relative to the annular element It rotates but cannot be detached from from the annular element (2).

18. fastener according to claim 17, wherein the endoporus of the annular element is big including the first hole (201), internal diameter In the second hole (202) of the internal diameter in first hole and the inclined surface in connection first hole and second hole, wherein institute The first side that the first hole is located at the close tightening piece of the annular element is stated, second hole is located at the separate of the annular element The second side of the tightening piece；The inclined surface is configured to stop second protrusion (13).

19. fastener according to claim 18, wherein second protrusion is worn from the first side of the annular element It crosses the annular element and reaches what the second side was formed through the stamping process later.

20. fastener according to claim 15, wherein the nut is seperated part with the annular element.

21. according to the fastener described in any one of claim 1-14, wherein the tightening piece is bolt head, the spiral shell Bolt head and the cooperation screw rod integrally connected simultaneously rotate together.

22. a kind of wrench device, for the fastener described in any one of claim 1-21, the tightening piece and described is realized The synchronous dismounting of annular element, wherein：

The wrench device includes：

The third main part (31) of tubular；

It is multiple it is spaced second blocking protrusions (320), be arranged on the inside of the third main part, and be configured to it is described First blocking protrusion of annular element is in contact cooperation；And

Engaging portion (33) is arranged on the inside of the third main part, and is configured to the regular prism shape phase with the tightening piece The regular prism shape of cooperation；

The internal diameter of the wherein described second blocking protrusion is more than the outer diameter of first main part (22) so that in the wrench device When being attached to the fastener, the second blocking protrusion offsets press-fit so that moving the ring with corresponding first blocking protrusion Shape part.

23. wrench device according to claim 22, wherein fasten the process of the fastener in the wrench device In, when the side of the second blocking protrusion stops that the corresponding side of protrusion is pressed against each other with first, the of the fastener One faying face is tightly coupled to each other with the second faying face, to realize the synchronous rotation of the tightening piece and the annular element.

24. the wrench device according to claim 22 or 23, wherein be formed between two first adjacent blocking protrusions Recess portion (24) central angle be more than it is described second stop protrusion (320) central angle.

25. wrench device according to claim 24, wherein be formed in recessed between adjacent two first blockings protrusions The central angle in portion (24) and it is described second blocking protrusion (320) central angle between difference no more than the tightening piece relative to The maximum allowable loosening angle of the annular element.

26. wrench device according to claim 25, wherein the second blocking number of projection and the first blocking protrusion (23) quantity is identical, to which when the wrench device is attached to the fastener, the second blocking protrusion (320) is inserted into To between corresponding two adjacent first blocking protrusions (23).

27. according to the wrench device described in any one of claim 22-26, wherein the second blocking protrusion is in the third master Central angle on the circumferencial direction in body portion is identical as central angle of the first blocking protrusion on the circumferencial direction of the annular element.

28. wrench device according to claim 27, wherein the second blocking protrusion is in the circumference side of the third main part The central angle of upward central angle and the first blocking protrusion on the circumferencial direction of the annular element is 20 °.

29. according to the wrench device described in one of claim 22-28, wherein described on the circumferencial direction of third main part The position of second blocking protrusion (320) is relative in radial directions across the flat of the central point on the regular prism side of the engaging portion The tightening direction for facing fastener deviates certain angle.

30. wrench device according to claim 29, wherein deviation the angle ranging from 10 °.

31. wrench device according to claim 22, wrench device further comprise：

Interconnecting piece (34), the interconnecting piece are formed in the inside of the third main part (31), and are configured to and external tool It is connected, to turn the wrench device.

32. wrench device according to claim 31, wherein being formed along the third main part in the interconnecting piece Radially extend the through-hole being inserted into for handle.