CN209724934U - Wheel-fastening device - Google Patents

Abstract

The utility model provides a wheel fastening device, which can effectively ensure the fastening torque when fastening bolts are fastened to the wheel, and fully avoid fastening torque attenuation. The wheel fastening device comprises: a bolt, which is provided with a bolt head at one end of the screw rod; and an anti-loosening part, which is approximately round and has a central through hole for the screw rod to nest, and the anti-loosening part is provided with A slit that cuts the anti-loosening member along the central axis.

Description

wheel fastening device

technical field

The utility model relates to a wheel fastening device, which is used for wheel fastening.

Background technique

In a conventional wheel, bolts are inserted into bolt holes provided in the wheel and screwed together to achieve fastening. But in actual use, the fastening torque is greatly attenuated. Thereby the fastening fit of the bolt and the bolt hole is loose, there is a potential safety hazard, and the increasingly stringent quality and safety requirements cannot be met.

Contents of the invention

Conventional wheel fastening devices have a problem of attenuation of fastening torque because a single bolt is used for fastening. Especially during the dynamic road test, the tightening torque will be attenuated by more than 30%.

In addition, since the fastened parts such as bolt holes are internally threaded, due to the limitation of the threading process, foreign matter such as debris usually remains on the threaded surface. Due to the existence of such foreign matter, it is easy to form a so-called false torque during the fastening process, resulting in a large attenuation of the fastening torque.

The utility model is proposed in order to solve the above problems, and the purpose is to provide a wheel fastening device, which can effectively avoid fastening torque attenuation.

Specifically, the wheel fastening device of the present utility model includes: a bolt, which is provided with a bolt head at one end of the screw rod; and an anti-loosening member, which is generally in the shape of a circular platform, and is provided with a central through hole for the screw rod to nest, The anti-loosening part is provided with a slit which cuts the anti-loosening part along the direction of the central axis.

Preferably, two cross-sections of the anti-loosening member facing each other across the slit are staggered along the direction of the central axis.

Preferably, when the anti-loosening part is projected in a plane including the central axis, the angle between the sides of the anti-loosening part is 50-60 degrees.

Preferably, the side of the anti-loosening component is subjected to surface treatment.

It is preferred that the surface treatment is coating or plating.

Preferably, the surface of the bolt head on the side of the screw is provided with a raised portion.

Preferably, the bulges are radially formed over the full length of the bolt head in the radial direction.

Preferably, the other end of the screw is provided with a wedge-shaped groove extending to the end surface of the screw.

Preferably, the depth of the wedge-shaped groove is greater than the thread depth of the screw.

The effect of the invention

According to the wheel fastening device of the present invention, the fastening torque when the fastening bolt is fastened to the wheel can be effectively ensured, and attenuation of the fastening torque can be sufficiently avoided.

Description of drawings

Fig. 1 is a perspective view of the wheel fastening device of the present invention.

Fig. 2 is a diagram explaining the anti-loosening part, (a) is a perspective view of the anti-loosening part, (b) is a bottom view of the anti-loosening part, and (c) is a front view of the anti-loosening part.

3 is a view explaining a bolt, (a) is a perspective view of the bolt, (b) is a side view seen from the bolt head side, and (c) is a side view seen from the screw rod side.

Explanation of reference signs

1 Anti-loosening parts

1h Central through hole

1s slit

1t side

1f1, 1f2 section

α angle

2 bolts

2a Bolt head

2b screw

2w wedge groove

3 bumps

Detailed ways

Embodiments are described below with reference to the drawings.

Fig. 1 is a perspective view of the fastening device of the present invention. As shown in FIG. 1 , the fastening device F of the present invention includes an anti-loosening part 1 and a bolt 2 , and the anti-loosening part 1 is nested on the bolt 2 . Fastening installation is achieved by inserting the fastening device F into the bolt hole of the wheel and tightening it.

In FIG. 1 , the central axis O of the bolt 2 is shown by a dashed-dotted line, and the fastening device F for the bolt 2 is formed substantially symmetrically about the central axis O as a whole.

The specific structure of the anti-loosening part 1 of the present invention is shown in FIG. 2 . As shown in (a) of FIG. 2 , the anti-loosening tool 1 has a substantially conical shape as a whole, and is formed with a substantially tapered side surface 1t. In addition, the anti-loosening member 1 is provided with a central through-hole 1h centered on the central axis O at the center, through which the screw rod 2b of the bolt 2 is inserted. The size of the central through hole 1h is determined according to the size of the bolt, and its diameter is set to be slightly larger than that of the screw rod 2b, so that the anti-loosening member 1 and the bolt 2 can achieve clearance fit.

In addition, the anti-loosening member 1 is formed with a slit 1s that cuts the anti-loosening member 1 in the direction of the center axis O. As shown in FIG. As shown in (b) of FIG. 2 , two cut surfaces 1f1 and 1f2 of the anti-loosening member 1 formed by cutting and facing each other face each other across a slit 1s.

Insert the bolt 1 nested with the anti-loosening part 1 into the bolt hole of the wheel for screw fastening. During the fastening process, the slit 1s of the anti-loosening part 1 will be tightened and closed. Tension is thereby generated, increasing the frictional force between the side surface 1t and the bolt hole to be fastened. Moreover, since the slit 1s is tightened and closed, the screw 2b inserted in the central through hole 1h of the anti-loosening member 1 is squeezed, and the friction force between the screw 2b and the central through hole 1h of the anti-loosening member 1 is also increased, which can prevent the screw 2b from turn.

Moreover, the two cut surfaces 1f1 and 1f2 of the anti-loosening member 1 can be staggered along the direction of the central axis O to form a difference in section. During the fastening process, the anti-loosening component 1 deforms in both the axial direction and the radial direction in such a manner that the section difference is reduced, so that the anti-loosening component 1 can be more effectively prevented from loosening.

Moreover, since the anti-loosening member 1 is provided with the slit 1s, foreign matter such as chips remaining on the external thread surface of the screw rod 2b can retreat into the slit 1s, further improving the anti-loosening effect.

As shown in (c) of Figure 2, in the projection of the anti-loosening member 1 in a plane containing the central axis O, the included angle formed by the sides of the projection of the generatrix forming the side surface 2t in the projection plane is set to α , the size of the included angle α is 50-60 degrees. The inventor has confirmed through experiments that within this angle range, the fastening torque decays little and the fastening effect is good.

In addition, surface treatment such as coating or plating may be given to the side surface 1t of the loosening prevention material 1 . Coating material or plating material can be selected according to different torque requirements. There is no limitation on the material or method of the surface treatment, for example, the surface can be treated with Dacromet. In addition, an adhesive material may also be added to the surface treatment material, as long as the surface friction coefficient of the side surface 1t of the anti-loosening member 1 can be increased.

With the anti-loosening part 1 of this embodiment, since the anti-loosening part 1 will not rotate with the bolt 2 when the bolt is tightened, the loss of surface friction material is small, and greater friction can be maintained, further avoiding the attenuation of the tightening torque .

As shown in Fig. 3, the bolt 2 of the present invention includes a bolt head 2a and a screw rod 2b. As shown in (a) and (c) of FIG. 3 , a raised portion 3 is formed on the surface of the bolt head 2 a on the screw 2 b side. By providing the raised portion 3, the frictional force between the bolt 2 and the anti-loosening member 1 can be increased, preventing the anti-loosening member 1 from rotating with the bolt 2, and further avoiding attenuation of the tightening torque.

In (c) of FIG. 3 , it is shown that the bulges are radially arranged, and the bulges extend over the entire radial length of the bolt head in the radial direction. However, the shape and arrangement of the bulges are not limited thereto. The shape of the bulges can be arbitrary, and can also be randomly arranged, as long as the frictional force between the surface of the bolt head 2a and the anti-loosening member 1 can be increased.

In addition, as shown in (a) and (c) of FIG. 3 , the bolt head 2a is located at one end of the screw 2b, and the other end of the screw 2b away from the bolt head 2a is provided with a wedge-shaped groove 2w. The wedge-shaped groove 2w extends from the end surface of the other end portion of the screw 2b.

Although not shown in the figure, external threads are provided on the surface of the screw 2b, and the wedge-shaped groove 2w is provided with a depth greater than that of the external threads of the screw 2b.

By providing the wedge-shaped groove 2w, during the fastening process, foreign matter remaining on the mounted surface such as the internal thread surface as the fastening object can be removed through the wedge-shaped groove 2w, thereby eliminating false torque and other factors that cause torque decay.

In addition, as shown in FIG. 3( b ), an installation recess is provided on the surface of the bolt head 2 a opposite to the surface on which the raised portion 3 is provided, and an installation tool such as a set wrench is used for installation operation. However, the mounting recess of the bolt head 2a is not limited thereto, as long as it can be mounted by a mounting tool.

In addition, the object to which the fastening device of the present invention is attached is not limited to the bolt hole of the wheel, and any attachment portion can be applied as long as the bolt fastening is possible.

Although specific embodiment was described above, these embodiment is an illustration and does not limit the scope of the invention. The scope indicated by the claims and its equivalent scope include the above-mentioned embodiments or various changes thereof without departing from the spirit and scope of the present invention.

Claims (9)

1. A wheel fastening device, characterized in that, comprising: a bolt having a bolt head at one end of the shank; and The anti-loosening part is generally in the shape of a circular platform, and is provided with a central through hole for the screw to nest, The anti-loosening part is provided with a slit which cuts the anti-loosening part along the direction of the central axis. 2. The wheel fastening device according to claim 1, characterized in that, The two cross-sectional surfaces of the anti-loosening member facing each other across the slit are staggered along the direction of the central axis. 3. The wheel fastening device according to claim 1, characterized in that, In the case of projecting the anti-loosening part in a plane including the central axis, the angle between the sides of the anti-loosening part is 50-60 degrees. 4. The wheel fastening device according to claim 1, characterized in that, The sides of the anti-loosening member are surface treated. 5. The wheel fastening device according to claim 4, characterized in that, The surface treatment is coating or plating. 6. The wheel fastening device according to claim 1, characterized in that, The surface of the screw head on the side of the screw is provided with a raised portion. 7. The wheel fastening device according to claim 6, characterized in that, The bulges are formed radially over the full length of the bolt head in the radial direction. 8. The wheel fastening device according to any one of claims 1 to 7, characterized in that, The other end of the screw is provided with a wedge-shaped groove extending to the end surface of the screw. 9. The wheel fastening device according to claim 8, characterized in that, The depth of the wedge-shaped groove is greater than the thread depth of the screw rod.