CN201771917U

CN201771917U - Constant-torque bolt

Info

Publication number: CN201771917U
Application number: CN201020266294XU
Authority: CN
Inventors: 王维金
Original assignee: XI'AN OCAME ELECTRIC CO Ltd
Current assignee: XI'AN OCAME ELECTRIC CO Ltd
Priority date: 2010-07-22
Filing date: 2010-07-22
Publication date: 2011-03-23
Anticipated expiration: 2020-07-22

Abstract

The utility model discloses a constant-torque bolt which comprises a twist-off dropping cap, a round bolt head and a screw rod, wherein the twist-off dropping cap and the round bolt head are fixedly connected, and a twist-off part is formed at the joint; and the twist off part is positioned in the round bolt head and can automatically fracture on reaching the designed torque value.

Description

A kind of constant-torque bolt

Technical field

The utility model relates to fastening piece, in particular a kind of constant-torque bolt.

Background technique

Daily life and industrial technology at us often can be seen the example that utilizes constant-torque bolt locking object in using, as: the antitheft and anti-loose torque nut that uses on soda bottle bottle cap, electric power and the communication iron tower, automobile engine cylinder moment of torsion clamping bolt etc.These products have been brought into play bigger effect for human progress.

Prior art scheme: block the hexagonal falling hat with opening or adjustable spanner and tighten gradually, when moment of torsion reaches design load, the hexagonal falling hat falls by twisting off a little to break, realize the purpose of constant-torque, guaranteeing in the process that object is locked not can be because of excessive damage of exerting oneself, and guaranteeing simultaneously can be because of too small the getting loose of exerting oneself in the process that object is locked.

Common torque bolt structure and shape are as shown in Figure 1 to Figure 3; Misoperation takes place in Fig. 1 and 2 easily, reason is hexangle type bolt head and the tablet bolt head position that the operator is stuck in spanner bolt easily, can cause moment of torsion to increase like this, the object that causes being locked damages, do not have the constant-torque effect, twist off a position simultaneously and be easy to generate sharp burr (as shown in Figure 4), injure the operator or produce other damage consequences.Volume is big in addition, manufacture cost is high, easy corrosion, moulding are coarse.

Though Fig. 3 has avoided the misoperation problem, brought again that torque bolt is difficult to withdraw from new problem, simultaneously, round bolt head skin friction is little, is unfavorable for hand the bolt band is tight, and working efficiency is reduced greatly.

Therefore, there is defective in prior art, needs to improve.

The model utility content

Technical problem to be solved in the utility model is at the deficiencies in the prior art, and a kind of constant-torque bolt is provided.

The technical solution of the utility model is as follows:

A kind of constant-torque bolt, comprise and twist off falling hat, circular bolt head and screw mandrel, the described falling hat that twists off is fixedlyed connected with described circular bolt head, described joint forms the broken part, described broken part is positioned at described circular bolt head inside, ruptures when reaching the design torque value automatically in described broken part.

Described constant-torque bolt, the described falling hat that twists off is fixedlyed connected with described circular bolt head one.

Described constant-torque bolt, described circular bolt head surface is provided with concavo-convex on-slip groove.

Described constant-torque bolt, described concavo-convex on-slip groove are the concavo-convex on-slip groove of straight line type.

Described constant-torque bolt, the described falling hat that twists off is a Hexagon.

Described constant-torque bolt also comprises and moves back a breach.

Described constant-torque bolt describedly moves back the top that a breach is positioned at described circular bolt head.

Described constant-torque bolt describedly moves back the dentation that a breach is an annular array.

The utility model is not only effectively finished the purpose by moment of torsion control object coupling mechanism force size, and overcomes preferably and avoided prior art defective that exist and that be difficult to avoid, mainly shows the following aspects:

1, the broken part is arranged on round bolt head inside, avoids twisting off the falling hat back that comes off and produces burr and damage object and operator;

2, circular bolt head adopts the round end structure of surface band tongue and groove, not only prevents workman's misoperation, and has improved working efficiency;

3, behind the surface band tongue and groove, not only increased skin friction, and made the moulding of torque bolt become attractive in appearance;

4, allow the silk work of moving back lighter, the science more that becomes, object can be locked in the rated torque value, can easily object be taken apart again;

5, manufacturing and cost of material reduce greatly, only are 1/2nd of existing cast iron torque bolt costs, have improved the market competitiveness.

Description of drawings

Fig. 1 to Fig. 4 is the schematic representation of prior art;

Fig. 5 is a side structure schematic representation of the present utility model;

Fig. 6 is a top surface structure schematic representation of the present utility model;

Fig. 7 is a perspective view of the present utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.

Embodiment 1

As shown in Figure 5, the utility model provides a kind of constant-torque bolt, comprise and twist off falling hat 1, circular bolt head 2 and screw mandrel 3, twisting off falling hat 1 fixedlys connected with circular bolt head 2, the joint forms broken part 5 (see figure 7)s, broken part 5 is positioned at circular bolt head 2 inside, avoiding twisting off the falling hat back that comes off produces burr and damages object and operator, calculating the constant-torque size of broken part according to the rated torque of locking object needs, ruptures when reaching the design torque value automatically in the broken part.Screw mandrel adopts the metal manufacturing, and remaining part adopts engineering plastics.

Another example as shown in Figure 5, twists off falling hat 1 and fixedlys connected with circular bolt head 2 one, i.e. once-through, be connected as a single entity.

As shown in Figure 6, circular bolt head 2 surfaces are provided with concavo-convex on-slip groove.

Preferably, concavo-convex on-slip groove is the concavo-convex on-slip groove of straight line type.

Preferably, as shown in Figure 6, twist off falling hat 1 and be Hexagon.

Embodiment 2

As shown in Figure 7, above-mentioned constant-torque bolt also comprises and moves back a breach 4.

Preferably, move back the top that a breach 4 is positioned at circular bolt head 2.

Preferably, as shown in Figure 7, move back a breach 4 and be the dentation of annular array.

During use, at first with the tight torque bolt of hand band, blocking hexagonal with six square box socket wrench in common then twists off falling hat 1 and tightens gradually, when moment of torsion reaches design load, hexagonal twists off falling hat 15 places fracture in the broken part, realize the purpose of constant-torque, guaranteeing in the process that object is locked not can be because of excessive damage of exerting oneself, and guaranteeing simultaneously can be because of too small the getting loose of exerting oneself in the process that object is locked.When maintenance or maintenance object torque bolt need be withdrawed from the time, be enclosed within on the circular bolt head 2 and be stuck in the fast knot spanner that matches and move back a breach 4 places, get final product along moving back silk counterclockwise.

Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of the utility model claims.

Claims

1. constant-torque bolt, it is characterized in that, comprise and twist off falling hat, circular bolt head and screw mandrel, the described falling hat that twists off is fixedlyed connected with described circular bolt head, described joint forms the broken part, described broken part is positioned at described circular bolt head inside, ruptures when reaching the design torque value automatically in described broken part.

2. constant-torque bolt according to claim 1 is characterized in that, the described falling hat that twists off is fixedlyed connected with described circular bolt head one.

3. constant-torque bolt according to claim 1 is characterized in that, described circular bolt head surface is provided with concavo-convex on-slip groove.

4. constant-torque bolt according to claim 3 is characterized in that, described concavo-convex on-slip groove is the concavo-convex on-slip groove of straight line type.

5. constant-torque bolt according to claim 1 is characterized in that, the described falling hat that twists off is a Hexagon.

6. constant-torque bolt according to claim 1 is characterized in that, also comprises moving back a breach.

7. constant-torque bolt according to claim 6 is characterized in that, describedly moves back the top that a breach is positioned at described circular bolt head.

8. constant-torque bolt according to claim 6 is characterized in that, describedly moves back the dentation that a breach is an annular array.