JPH0665004U - Fixing structure of rim and disc in vehicle wheel - Google Patents

Abstract

(57) [Summary] [Purpose] When fixing the rim of a vehicle wheel and a disc, the purpose is to make it possible to maintain the tensile force constantly and to reduce the weight by a method that does not generate torsional stress in the shaft of the bolt. And [Structure] A structure for fixing a rim such as a two-piece or a three-piece wheel and a disc by a fastening tool, wherein a fastening groove is provided on a shaft portion of the fastening tool, and a fastening force is generated by caulking a collar in the groove. With a fixed structure that allows the shaft to be crimped while pulling it, the stamping die has a polygonal or notched shape to facilitate removal of the collar. In addition to making the fixing groove part spiral and making it polygonal, it is provided with a recess for improving the fixability of the tip of the drill.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fixing structure for integrally integrating a disc with a rim such as a two-piece or three-piece wheel in a vehicle wheel.

[0002]

[Prior art]

 In general, wheels for vehicles are used under severe conditions, and extremely reliable parts are required for life-saving parts. On the other hand, on the other hand, there is a method in which the disc portion and the rim portion are separately manufactured and assembled with bolts and nuts due to design and manufacturing problems. In such a case, the materials of the bolts and nuts are carefully selected, and a certain force is applied with a torque wrench, and an adhesive is applied to prevent loosening.

However, when the rim consists of two pieces and the peripheral edge of the disk is fixed with bolts and nuts, it is unavoidable to reduce the pitch of the bolts in order to prevent air leakage, and the weight is heavy. It is common to use 25 to 30 bolts having a diameter of 7 to 8 mm to reduce the above.

In general, a method of connecting a plurality of members by bolts and nuts to integrate them is used in all fields and is reliable.

[0005]

[Problems to be solved by the device]

 However, the well-known assembly type wheel is subject to non-uniform load from all angles while rotating, and the thickness of the disk peripheral part is about 25 mm including the thickness of the rim, especially when it is made of light alloy. The bolt has a shaft diameter of 7 to 8 mm and 25 to 30 bolts are arranged. Therefore, mechanically, it is difficult to tighten, and while applying the same tensile force to many bolts, Tightening without looseness can be a rather difficult problem.

Therefore, it is ideal that the distance between the head of the bolt and the inner part of the nut, that is, the thickness of the member to be fixed is approximately twice the diameter of the bolt shaft. When there is residual torsional stress in the shaft of the nut and the nut is rotated and tightened, the friction force naturally increases at the part where the nut contacts the fixed member, especially when the fixed member is made of light alloy. Even if the torque that rotates the nut is constant, the tensile force applied to the bolt is not always constant. This fact causes a very serious situation such as air leakage in the case of a three-piece wheel.

As a remedy for this, a method other than rotating and tightening the nut, that is, caulking seems to be the best, but the wheel is constantly subjected to various vibrations, and further, it is caused by braking and running resistance. Under the influence of heat, the caulking material expands and becomes easier to loosen.

[0008] The problem to be solved is to provide a fixing structure capable of continuously retaining a tensile force and reducing the weight of a wheel by a method in which a torsional stress is not generated in a shaft portion of a bolt. To do.

[0009]

[Means for Solving the Problems]

 The fixing structure of the present invention is a fixing structure using a rim such as a two-piece or a three-piece wheel and a fastening tool for a disc, wherein a fastening groove portion is provided on a shaft portion of the fastening tool, and a collar is caulked into the fastening portion. With this structure, the fastening force is generated.

Further, the fixing groove is formed in a spiral shape, and a polygonal shape or a notch-shaped part is formed around the shaft head or in the central part in order to impart a turning force to the shaft. The cross section of the collar in the direction perpendicular to the axial direction after being crimped is polygonal or notched.

Further, the center of the shaft head of the tightening tool is provided with a recess for fixing the tip of the rotating drill.

[0012]

[Action]

 Since the fixing structure of the present invention can make the fixing force constant and does not generate torsional stress, even if the shaft diameter is about 10% smaller than the conventional screw, the same tightening force can be obtained.

[0013]

[Embodiment 1] FIG. 1 is a sectional view showing the basic structure of one embodiment of the present invention, and FIGS. 2, 3 and 4 are other embodiments for the purpose of disassembling. Is shown.

In FIG. 1, 1 is an outer rim, 2 is an inner rim, and 3 is a disc. The shaft portion 5 of the tightening tool 4 is inserted by providing a hole penetrating these. The shaft portion 5 is provided with a fixing groove portion 6 and a hooking groove portion 7. These grooves 5 and 6 may be spiral screws, but they may be ring-shaped shoulders, and the pitch of the shoulders does not necessarily have to be the same as with screws. Further, the collar 8 is inserted at the position indicated by the broken line, and the hook groove portion 7 is pulled by a tool. At the same time, the collar 8 is pressed from the surroundings and caulked as shown by the solid line portion. Therefore, the torsional stress does not remain in the shaft portion 5, and the stress parallel to the shaft center always remains. For example, even if one wheel has 30 bolt-fastened portions, the rims will not be twisted evenly. The disc can be tightened. After the fixing, the hooking groove portion 7 becomes unnecessary, so that the pre-breaking break portion 9 may be provided in advance, and the tool may be pulled and broken with a stronger force using a tool, or may be bent. Therefore, the end portion of the shaft portion 5 is left as a fracture surface.

[0015]

Embodiment 2 In FIG. 2, the fixing groove 10 is formed in a spiral shape in the shaft portion 5 of the fixed tightening tool 4, and the collar 8 can be removed by rotating the shaft portion 5. Further, by forming the periphery of the shaft head portion 11 into a polygonal shape, it is possible to easily apply a turning force to the shaft portion 5 using a tool such as a spanner. In addition to being able to be machined in the center of the head, the polygonal part may be provided with a notch shape or a slot for a driver. However, it goes without saying that the inclination angle when the fixing groove portion 10 is formed in a spiral shape is an angle at which the collar portion does not slip out naturally.

[0016]

Third Embodiment FIG. 3 shows a case where a notch structure is used for a tool die when caulking a collar 12 so that a fixed portion can be disassembled again as in the second embodiment. This is to allow the wrench to grasp the collar sufficiently when twisting and removing it. Therefore, the fixing groove portion has a spiral shape. In this case, the same effect can be obtained even if the notch structure portion has a polygonal shape.

[0017]

[Embodiment 4] FIG. 4 is an embodiment for facilitating disassembly of the fixed rims 1 and 2 and the disc 3, in which a fastening tool 4 for accurately setting the tip of the drill at the center of the shank. A recess 13 is provided in the center of the head. The method of implementation is to use a drill having a diameter slightly larger than the diameter of the shaft portion 5 to make a hole in the head portion from the head portion and cut to the position shown by the broken line to remove the head portion 14 of the tightening tool 4. To do so.

[0018]

Fifth Embodiment FIG. 5 shows a caulking structure in the case of using a shaft portion having no hooking groove portion 7 for hooking the tool described in the first embodiment. The shaft head 15 is pressed against the pedestal 16 and penetrates the outer rim 1, the disk 3 and the inner rim 2 to pass the shaft portion 17, and the collar 19 is set in the fixing groove portion 18 at the position shown by the broken line. Then, the collar is pressed with a stamping die 20 and caulked in the fixed groove portion. In this case, the shaft end portion 21 has a machined surface and does not have the fracture surface as in the above embodiment.

[0019]

[Effects of the Invention] As described above, the fixing structure of the rim and the disk according to the present invention makes it easier to make the fixing force constant compared to the conventional screw, and the torsional stress does not occur. In view of this point, compared with the conventional screw, the shaft diameter is about 10% smaller and the same tightening force can be obtained, so that the weight of the wheel is reduced and the reliability against air leakage is improved. Since such a tightening tool applies only a tensile force parallel to the center line of the shaft, the material is not limited to metals in particular, and if carbon fiber or the like with excellent tensile strength is used, the weight of the shaft can be further reduced. It is possible to

Further, it is easy to remove the collar if the fixing groove is spiral and the shaft head is polygonal or notched, or if the crimped collar is polygonal or notched.

Furthermore, since the shaft head of the tightening tool is provided with a recess, the cutting edge of the drill is stabilized and the tightening tool can be easily removed.

[Submission date] March 17, 1992

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Added

[Correction content]

Therefore, it is ideal that the distance between the head of the bolt and the inside of the nut, that is, the thickness of the member to be fixed is about twice the bolt shaft diameter. When the nut is rotated and tightened due to residual torsional stress on the shaft, the frictional force naturally increases at the part where the nut contacts the fixed member, especially when the fixed member is made of light alloy. Even if the nut rotates into the nut, the torque to rotate the nut is constant, but the tensile force applied to the bolt is not always constant . In fact, the minimum and maximum values have four times the openness. . In the case of a three-piece wheel, this fact causes a very serious situation such as air leakage.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010] Then, and fixing grooves are formed in a spiral shape, and at least the peripheral or central collar or shaft head is small and to allow imparting rotation force to the shaft portion, polygonal or It is provided with a notch-shaped portion, or after being crimped, the cross-sectional shape of the collar in the direction perpendicular to the axial direction is polygonal or notched.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Added

[Correction content]

In FIG. 1, 1 is an outer rim, 2 is an inner rim, and 3 is a disc. The shaft portion 5 of the tightening tool 4 is inserted by providing holes penetrating these. The shaft portion 5 is provided with a fixing groove portion 6 and a hooking groove portion 7. These grooves 5 and 6 may be spiral screws, but they may be ring-shaped shoulders, and the pitch of the shoulders does not necessarily have to be uniform as with screws. Further, the collar 8 is inserted into the position shown by the broken line, and the hooking groove 7 is pulled with a tool, and at the same time, the collar 8 is pressed from the surroundings and caulked as shown by the solid line. Therefore, the torsional stress does not remain on the shaft portion 5 and the stress parallel to the shaft center always remains. Therefore, for example, even if one wheel has 30 bolt tightening portions, all the rims can be connected with equal force. The disc can be tightened. After the fixing, the hooking groove portion 7 is no longer necessary, and therefore the breaking portion 9 may be provided in advance, and the tool may be pulled by a stronger force with a tool to break or fold it. In this case, the end of the shaft 5 left as the fracture surface is left as it is, or is appropriately treated with a grinder or the like according to the state of the fracture surface to finish it as a polished surface.

[Brief description of drawings]

FIG. 1 is a sectional view showing a fixing structure according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a fixing structure of a second embodiment which is disassembled.

FIG. 3 is a cross-sectional view showing a fixing structure of a third embodiment which is disassembled.

FIG. 4 is a cross-sectional view showing a head structure for removing the tightening tool head.

FIG. 5 is a cross-sectional view showing a caulking structure when a shaft portion having no hooking groove portion is used.

[Explanation of symbols]

 1 Outer Rim 2 Inner Rim 3 Disk 4 Tightening Tool 5 Shaft 6 Fixing Groove 7 Hooking Groove 8 Collar 9 Breaking Part 10 Spiral Fixing Groove 11 Polygonal Head 12 Notched Collar 13 Cavity 14 Tightening Head Part 15 Shaft head 16 Cradle 17 Shaft 18 Fixing groove 19 Collar 20 Stamping die 21 Shaft end

[Procedure amendment]

[Submission date] March 17, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Scope of utility model registration request

[Correction method] Change

[Correction content]

[Scope of utility model registration request]

2. The ring-shaped fixing groove is independent on the circumference of the shaft.
The fixing structure according to claim 1, wherein the fixing structure comprises a groove.

3. The fixing groove is formed in a spiral shape,
A polygonal or notched portion is provided at least in the periphery of the collar or the shaft head or in the central portion thereof in order to impart a turning force to the shaft portion.
Fixed structure described in.

4. The fixing structure according to claim 1, wherein, after being crimped, the cross-sectional shape of the collar in the direction perpendicular to the axial direction has a polygonal shape or a cutout shape.

5. The fixing according to any one of claims 1 to 4, wherein a recess for fixing a tooth tip of a rotating drill is provided in a central portion of a shaft head of the tightening tool. Construction.

Claims (5)

[Scope of utility model registration request] 1. A fixing structure of a rim such as a two-piece or a three-piece wheel and a fastening tool for a disc, wherein a fastening groove portion is provided on a shaft portion of the fastening tool, and a fastening force is obtained by caulking a collar in the groove portion. Fixing structure of the rim and the disc in the vehicle wheel that causes the phenomenon. 2. The fixing groove is formed in a spiral shape,
The fixing structure according to claim 1, wherein a polygonal shape or a cutout-shaped portion is provided around or in the center of the shaft head so as to apply a turning force to the shaft. 3. The fixing structure according to claim 1, wherein, after being crimped, the cross-sectional shape of the collar in the direction perpendicular to the axial direction has a polygonal shape or a cutout shape. 4. The fixing structure according to claim 1, wherein a central portion of a shaft head portion of the tightening tool is provided with a recess for fixing a tip of a rotating drill. 5. The fixing structure according to claim 1, wherein a shaft end portion of the tightening tool has a fracture surface.