JP2001277801A - Center lock device for automobile wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a center lock device for an automobile wheel preventing a center lock nut from shaking, loosening, or seizing up. SOLUTION: In this center lock device, a male screw 21 to be engaged with a center lock nut N is carved on the outer surface of a vertically erecting center shaft 20 projecting forward from an independent adapter A for attaching a boss part 10 of a wheel disk D to a hub 18 of an axle, and an expansion slot 31 for deflection is cut in a prescribed range α of angle on the outer surface of the lock nut N to tighten up a stopper screw B screwed from the front in the direction nearly orthogonally crossing the expansion slot 31. By the tightening of the stopper screw B, the lock nut N is warped/deformed so as to close the expansion slot 31 from the entrance, and is fixed and maintained in the lock condition with the male screw 21 of the center shaft 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center lock device for an automobile wheel, and more particularly to a device for completely preventing rattling, loosening, and seizure during use of the center lock nut.

[0002]

2. Description of the Related Art Even when repeatedly subjected to sudden braking or other vibrations or impacts while driving on a general road, the center lock nut holding down and fixing the wheel disc does not cause rattling, loosening, seizure, etc. Despite that, quick wheel attachment and detachment like a racing car
The inventor has previously proposed Japanese Patent No. 2930293 as a center lock device for a vehicle wheel that can be replaced.

[0003] This is considered to be the only known technique that is closest to the present invention, based on the background of the straight patenting, without being notified of the reason for refusal upon examination.

[0004]

However, as a result of intensive studies after that, according to the configuration of the above-mentioned known invention, the circumference of the hollow center shaft (20) itself has been reduced. Due to the fact that the splitting groove for distortion (22) is cut in the surface, a pair of front and rear stays (23) and (24) parallel to each other are inwardly stretched inward from a part of the circumferential surface of the center shaft (20). Otherwise, the set screw (27) for closing the split groove (22) cannot be screwed.

In the case of a vehicle type in which the screw tip of the axle protrudes long into the hollow center shaft (20), the stays (23) and (24) and the setscrew projecting inward from the center shaft (20). (27) As a result, the wheel disc (D) and its adapter (A) cannot be used because the wheel disc (D) or its adapter (A) is attached to the hub (18) of the axle or the hub fixing nut at the tip of the screw. Occurs, and it is impossible to exhibit versatility to all types of vehicles.

Also, the center lock nut (N) may be accidentally overtightened too much, or the lock nut (N)
In the event that it becomes impossible to remove it due to burn-in, the adapter (A), which is much more expensive than the lock nut (N), must be destroyed, and the entire unit must be replaced with a new one. Disappears.

[0007] On the other hand, according to the configuration described in the claims of the above-mentioned known invention, a solid center shaft (2
0) Since the distortion dividing groove (22) is cut in the circumferential surface of the hollow center shaft (20), the stay (2)
3) Although it is not necessary to provide (24), since the center axis is a solid center shaft (20) despite the provisional provision, the above-mentioned split groove (22) itself is significantly smaller than this. According to 27), it is extremely difficult to deform and deform so as to close.

[0008]

SUMMARY OF THE INVENTION The present invention contemplates a further improvement of such a problem, and for this purpose, firstly in terms of construction, a wheel disk boss in an overall top hat or cylinder hat type adapter. Projecting a large-diameter mounting flange from the base end of the conical body that fits the part,
A plurality of torque pin receiving holes and stud bolt receiving holes are formed in the mounting flange as radially symmetric distribution types in which the two types are alternately scattered.

On the outer peripheral surface of the hollow center shaft which forms the tip of the conical body, a male screw for screwing with a center lock nut is engraved.

First, in order to attach the adapter to the hub of the axle, the stud bolt receiving hole of the mounting flange is completely fitted from the hub of the axle to the stud bolt which is integrally erected, and the hub nut is inserted into the stud bolt from the front. Each is screwed together,

Then, in order to attach the wheel disc to the adapter, all the torque pins projecting rearward from the boss portion of the wheel disc are pressed into the torque pin receiving holes of the mounting flange.

Finally, a center lock device for a vehicle wheel for pressing and fixing the wheel disk by screwing a center lock nut from the front to the male screw of the center shaft,

The center lock nut is formed by cutting a strain split groove in the outer peripheral surface of the center lock nut within a predetermined angle range and tightening a set screw screwed in from the front substantially perpendicular to the split groove. It is characterized in that it is determined to deform and deform so as to close from the entrance of the split groove,

Second, a large-diameter mounting flange projects from the base end of the cylindrical body to be fitted with the boss portion of the wheel disc in the overall top hat type or cylinder hat type adapter, and the mounting flange is formed on the mounting flange. Each of the plurality of torque pin receiving holes and stud bolt receiving holes is formed as a radially symmetric distribution type in which the two types are alternately scattered.

A male screw for fastening with a center lock nut is engraved on the outer peripheral surface of a solid center shaft that protrudes integrally from the top surface that closes the distal end of the cylindrical body and that protrudes vertically. ,

First, in order to attach the adapter to the hub of the axle, the stud bolt receiving hole of the mounting flange is completely fitted from the hub of the axle to the stud bolt which is integrally erected, and the hub nut is inserted into the stud bolt from the front. Each is screwed together,

Next, in order to attach the wheel disc to the adapter, all the torque pins projecting backward from the boss portion of the wheel disc are pressed into the torque pin receiving holes of the mounting flange.

Finally, the wheel disc press collar is fitted into the center shaft from the front, and a center lock nut is screwed and fastened to the male screw of the center shaft so that the wheel disc is pressed and fixed. In the wheel center lock device,

The center lock nut is formed by cutting a strain split groove in the outer peripheral surface of the center lock nut within a predetermined angle range and tightening a set screw screwed in from the front substantially perpendicular to the split groove. It is characterized in that it is set so as to be distorted and deformed so as to close from the entrance of the split groove.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a first embodiment of the present invention; FIG. A relatively large shaft hole (11) is formed in the center of the boss (10). (12)
(13) is a female screw for receiving a torque pin and a concave groove for releasing a hub nut, which are respectively formed in the rear surface (the mounting surface of the wheel disc) of the boss portion (10) while being located around the shaft hole (11). In each case, a plurality of (five in the example in the figure) which are scattered and distributed in a radially symmetrical form are provided, and the two types are alternately arranged.

Numeral (14) is a torque pin which is screwed and integrated into the female screw (12) of the wheel disc (D), respectively, and projects a predetermined amount backward from the rear surface of the boss (10). . Reference numeral (15) denotes a notch for the turning operation tool provided at the rear end of the overhang of each torque pin (14), and the torque pin (not shown) is locked by the turning operation tool (not shown). 14) is screwed into the receiving female screw (12).

(16) A stopper flange protruding slightly larger in diameter from the mid-height position of each torque pin (14), which is a concave step cut out at the opening edge of the female screw (12). The projection is locked to the surface (17), so that the overhang amount at the time of the above-mentioned implantation fastening is kept constant, and at the same time, the swinging or falling of the torque pin (14) itself is prevented.

(A) is a separate adapter for attaching the boss (10) of the wheel disc (D) to the hub (18) of the axle, which is rich in strength of iron, light alloy, ceramic or the like. It is preferably molded from a lightweight material into an overall top hat or cylinder hat shape.

That is, in FIGS.
(19) is a body of the adapter (A) having a substantially tapered conical shape, and has a shaft hole (1) of the wheel disc (D).
It has a size that fits in 1). Reference numeral (20) denotes a relatively thick cylindrical hollow center shaft which projects continuously and integrally from the tip of the conical body (19) forward and vertically, and is screwed and fastened to an outer peripheral surface thereof with a later-described center lock nut. An external thread (21) is engraved. (22) similarly shows a concave peripheral groove for receiving a center cap, which is cut out on the inner peripheral surface of the distal end of the hollow center shaft (20).

On the other hand, the base end of the conical body (19) in the adapter (A) has a large circular mounting flange (2).
As 3), a plurality of (five in the example in the figure) a plurality of torque pin receiving holes (24) for receiving the torque pins (14) are continuously extended from the conical body (19). The apertures are dotted in a radially symmetric distribution type.

(25) is a plurality (five in the illustrated example) of stud bolts which are planted forward and integrally from the hub (18) of the axle, and (26) is a screw which is screwed into each of the stud bolts (25) from the front. The stud bolt receiving hole (27) for receiving the stud bolt (25) is a hub nut to be fastened together.
3) An opening is formed as a dotted distribution alternately with the torque pin receiving hole (24).

FIG. 6 (N) shows a center lock nut which is screwed into the male screw (21) of the hollow center shaft (20) of the adapter (A) from the front.
As shown in FIGS. 10 to 10, a relatively large circular stop flange (2) is formed from the rear end of the base, which has a relatively large diameter.
8) is continuously extended.

In addition, the rear surface of the stop flange (28) is formed as a conical surface (29) for centering so that automatic centering with the wheel disc (D) can be ensured. Reference numeral (30) denotes an insertion guide leg slightly projecting further rearward from the restraining flange (28), and is inserted and locked into the shaft hole (11) of the wheel disc (D).

(31) is about 2 へ from the front as shown in FIGS. 7 and 9 to the outer peripheral surface of the center lock nut (N).
It is a split groove for distortion cut in a fixed angle range (α) of 00 ° to 260 °, and is substantially orthogonal to the cylinder core line (wheel rotation axis) (OO) of the hollow center shaft (20). The notch divides the center lock nut (N) approximately into a front half and a rear half.

(32) is located on an imaginary line (XX) substantially bisecting the fixed angle range (α) of the split groove (31), and is substantially the same as the center lock nut (N). A set screw receiving fool hole formed in the front half, and a large diameter head (33) of the set screw (B) in the middle.
There is also provided a concave step surface (34) for receiving the pressure. (3
5) is a female screw drilled in the second half of the remaining center lock nut (N) in a relational state of communicating with the stepped fool hole (32), and the set screw (B).
Of the shaft part (36).

Therefore, a stepped stupid hole (3) is opened at the eccentric position of the center lock nut (N).
2) into the female screw (35), screw in one set screw (B) from the front substantially perpendicular to the groove (31),
By strongly tightening this, the center lock nut (N) is set to its split groove (31) as shown in FIGS.
Can be deformed so as to close from the entrance of the center shaft, and can be fixedly maintained in a locked state in which the male screw (21) of the center shaft (20) does not loosen or loosen. At this time, the large-diameter head (33) of the set screw (B) fits into the stupid hole (3).
You will be immersed inside 2). (37) is a notch for locking a rotating operation tool (not shown) provided on the head (33).

The number (38) is a large number (14 in the illustrated example) distributed in the front of the center lock nut (N).
And a fixed angular pitch (about 24 degrees in the illustrated example) (β) inclusive of the set screw receiving stud hole (32) and female screw (35). Is scattered around. The locking groove (38) not only contributes to the weight reduction of the center lock nut (N) but also allows the circular center lock nut (N) to be rotated.

(T) is a special dedicated rotating operation tool for the center lock nut (N), which is a plurality of selectively removably insertable and insertable ones into the plurality of locking grooves (38) as shown in FIG. A locking pin (39) is provided, and as shown by the chain line in FIG. 2, the center lock nut (N) can be rotated by inserting it into the locking groove (38). It is preferable that the plurality of locking pins (39) are implanted and integrated into the rotating operation tool (T) as at least three radially symmetric distribution type as shown in the example of the drawing.

According to this, the center lock nut (N) cannot be rotated unless a special rotation operation tool (T) from which the locking pin (39) projects is used. (N) and helps prevent wheel theft.

The center lock nut (N) is shown in FIG.
As shown in a second modified embodiment, the shape is formed into a regular polygon having the circular stopping flange (28), and the imaginary line connecting the vertex and the rotation center point is formed by the distortion dividing groove (31).
A virtual line (X-
X), and 1 on the virtual line (XX).
The set screw receiving hole (32) and female screw (3
5) may be perforated so as to be in mutual mutual communication. In this case, the locking groove (3) of the special turning operation tool (T) is used.
8) can omit this.

As is apparent from another modified embodiment shown in FIG. 13, a plastic center cap (40) having a size substantially corresponding to that of the center lock nut (N) is prepared, and the rearwardly integrated one is formed. The wedge leg (41) protruding from the center cap (4) is inserted into and removed from the concave groove (22) for receiving the center cap of the hollow center shaft (20) from the front so as to be locked.
It is preferable that the hollow center shaft (20), the setscrew (B), and the locking groove (38) for the rotary operation tool be covered and coated so that muddy water, dust, and the like do not enter or accumulate according to 0).

At this time, if the center cap (40) is formed into a regular polygon different from the circular center lock nut (N), the appearance similar to that of a conventional automobile wheel can be impressed.

FIGS. 14 to 16 show a second embodiment of the present invention, in which the body (1) of the adapter (A) is shown.
9) is formed into a substantially cylindrical shape which fits into the shaft hole (11) of the wheel disc (D), and its tip is kept closed as a top surface (42). In the center of the top surface (42), a tetrapod-shaped (pseudo equilateral triangle) center axis escape hole (43) is seen from the front.
Is cut out relatively large. Reference numeral (44) denotes a plurality (three in the illustrated example) of countersunk screw receiving holes which are dotted and opened as a whole radially symmetric distribution type around the center axis escape hole (43).

On the other hand, the center shaft (20) has a solid cylindrical shape thinner than that of the first embodiment, and the joining skirt (45) is continuously and integrally protruded from the base end thereof, so that the overall structure is improved. Its cross section is shaped almost like an inverted T.
The joining skirt (45) is clear from FIG.
Center shaft escape hole (43) for the adapter (A)
In other words, it has a cross-shaped Taylor pot type (pseudo equilateral triangle), which includes a plurality of female screws (46) for fastening the countersunk screws that correspond to the countersunk screw receiving holes (44) of the adapter (A). However, it is also drilled in an overall radially symmetric distribution type.

Then, the joining skirt (45) of the solid center shaft (20) separates the center shaft escape hole (43) of the adapter (A) to the top surface (42) of the adapter (A). Since it is joined to the adapter (A) by a plurality of countersunk screws (47) screwed into the female screw (46) through the countersunk screw receiving hole (44) from the opposite front and from the opposite front, it is integrated and integrated. is there.

In the fixed state, the center shaft (20) projects forward from the top surface (42) of the adapter (A) and stands upright. Therefore, as in the first embodiment, A center lock nut (N) can be screwed into the male screw (21) engraved on the outer peripheral surface of the solid center shaft (20) from the front. However,
From the center of the top surface (42) of the adapter (A), a solid cylindrical center shaft (20) may be continuously and integrally protruded from the center of the top surface (42).

(C) is the center lock nut (N)
FIG. 4 shows a presser collar interposed between the front and rear of the wheel disc (D), which is formed from a light alloy into a saucer type sized to cover the shaft hole (11) of the wheel disc (D). ing.

That is, a circular concave step surface (48) for receiving a center lock nut (N) is provided at the center of the holding collar (C). (49) is a restraining shoulder surface similarly provided on the circular peripheral portion of the holding collar (C), and presses the boss (10) of the wheel disc (D) from the front.

It is preferable that the holding collar (C) of the wheel disc (D) be assembled and integrated in advance through the center lock nut (N) and the retaining ring (50). Then, under the assembled state, the male screw (2) of the center shaft (20)
This is because the center lock nut (N) can be smoothly and efficiently fastened to 1).

At this time, the contact surface between the overhanging flange (28) of the center lock nut (N) and the concave step surface (48) of the presser collar (C), which is responsible for the flange, has a friction coefficient different from that of the two. It is desirable to insert and set a washer (51) made of copper, brass, stainless steel, plastic, or the like. By doing so, despite the fact that the center lock nut (N) can be stably and firmly fastened, the seizure of the center lock nut (N) with the presser collar (C) can be prevented, and the attachment / detachment / replacement work of the wheel is hindered. Because there is no.

Even in the second embodiment, the outer circumferential surface of the center lock nut (N) has a split groove (3) for distortion.
1) is also the axis of the center axis (20) (wheel rotation axis) (O-
O) is cut out so as to be substantially orthogonal to the imaginary line (X) which divides the fixed angle range (α) into approximately two equal parts.
-X) At the eccentric position, a stepped stupid hole (32) for receiving a set screw and a female screw (35) are drilled so as to communicate with each other.

Therefore, as is apparent from FIG. 14, the above-mentioned stupid hole (3) is also
2) Through one screw (B) to female screw (35)
And the center lock nut (N) is distorted and deformed so as to be closed from the entrance of the split groove (31) by the tightening operation.
The male screw (21) can be fixedly held in a locked state without rattling or loosening.

In this case, even if the center lock nut (N) is formed in a regular polygon, the notch (3) for the turning operation tool provided on the head (33) of the set screw (B).
By specializing 7) as, for example, a pseudo-triangular or elliptical shape having a round shape reminiscent of a rotary engine as shown in FIG. 16, it is possible to prevent the center lock nut (N) and the wheel from being stolen. .

Since the other configuration in the second embodiment is substantially the same as that in the first embodiment, FIG.
Only the reference numerals corresponding to those in FIGS. 1 to 11 are entered in 4 to 16, and the detailed description thereof is omitted.

A method of attaching the wheel disc (D) to the hub (18) of the axle will be described with reference to the first embodiment shown in FIGS. 1 to 11. First, the attachment flange (23) of the adapter (A) is attached to the axle. The stud bolt (25), which is superimposed on the hub (18) and is planted from the hub (18), is inserted into the stud bolt receiving hole (2) of the mounting flange (23).
7) and stud bolt (2
5) Attach and fix the adapter (A) to the hub (18) of the axle by screwing a hub nut (26) into the hub from the front. Reference numeral (52) denotes a fixing nut of the hub (18) which has been screwed and fastened to the screw tip (53) of the axle.

Next, as a condition in which the torque pin (14) is pressed into the torque pin receiving hole (24) of the mounting flange (23), the wheel disc (D) is inserted into the conical body (19) of the adapter (A) from the front. The center lock nut (N) is screwed from the front to the male screw (21) of the hollow center shaft (20) forming the distal end of the adapter (A) by fitting the boss (10). Then, the wheel disc (D) is pressed and fixed.

Then, the rotational torque of the hub (18) is primarily changed from the stud bolt (25) and the hub nut (26) to the adapter (A), and from the adapter (A) to the torque pin secondarily. (14) is transmitted to the wheel disc (D) smoothly and reliably, and the wheel rotates without any trouble.

Finally, the set screw (B) is screwed into the eccentric position of the center lock nut (N) from the front, and the center lock nut (N) is strongly tightened. 31) is deformed so as to be closed from the inlet portion, and the male screw (2) of the hollow center shaft (20) is deformed.
In contrast to 1), the lock state is maintained in a locked state that does not rattle or loosen, and the seizure can be reliably prevented.

On the other hand, when replacing the wheel, the set screw (B) may be loosened to release the deformed state of the center lock nut (N). that way,
Since the center lock nut (N) can be removed, the wheel disk (D) can be removed from the hub (18) of the axle.

In the case of the second embodiment shown in FIGS. 14 to 16, a separate columnar screw (47) separates the top surface (42) of the cylindrical body (19) of the adapter (A) into a separate cylindrical shape. The joint skirt (45) of the center shaft (20) is fastened and integrated. Further, the presser collar (C) and the center lock nut (N) are sequentially fitted from the front to the solid center shaft (20) that protrudes from the adapter (A).

The remaining wheel mounting operation method and wheel replacement operation method are the same as those in the first embodiment.
Even in the configuration of the second embodiment, the set screw (B) is screwed into the eccentric position of the center lock nut (N) from the front side and tightened, so that the center shaft (2) is formed.
Needless to say, rattling, loosening and seizure of the center lock nut (N) with respect to the male screw (21) of 0) can be completely prevented.

[0057]

As described above, according to the present invention, the overall top hat type or cylinder hat type adapter (A) is used.
A large-diameter mounting flange (23) projects from the base end of the conical body (19) fitted with the boss (10) of the wheel disc (D), and a torque pin receiving hole (24) is formed in the mounting flange (23). ) And a plurality of stud bolt receiving holes (27) are formed as radially symmetric distribution types in which the two types are alternately scattered.

A male screw (21) for screwing with a center lock nut (N) is engraved on the outer peripheral surface of the hollow center shaft (20) forming the tip of the conical body (19).

First, in order to mount the adapter (A) to the hub (18) of the axle, its mounting flange (23) is used.
Stud bolt receiving hole (27) of axle hub (1)
8) The stud bolts (25) which are integrally planted from 8) are completely fitted, and the hub nuts (26) are screwed and fastened to the stud bolts (25) from the front, respectively.

Next, in order to attach the wheel disc (D) to the adapter (A), a torque pin (14) integrally projecting rearward from the boss (10) of the wheel disc (D) is attached to the mounting flange ( Press into the torque pin receiving hole (24) of 23)

Finally, a center lock nut (N) is screwed into the male screw (21) of the center shaft (20) from the front to fix the wheel disc (D). In the center lock device,

A set screw which is formed by cutting a split groove for distortion (31) into the outer peripheral surface of the center lock nut (N) within a predetermined angle range (α), and screwing the groove from the front substantially orthogonal to the split groove (31). By tightening (B), the center lock nut (N) is deformed and deformed so as to close from the entrance of the split groove (31).
This has the effect of completely improving the problem of the prior art described at the beginning.

That is, according to the above configuration of the present invention, the center lock nut (N) which is screwed into the male screw (21) of the hollow center shaft (20) from the front and presses and fixes the wheel disc (D). ) On the outer peripheral surface
1) is cut in a fixed angle range (α), and the center lock is formed by tightening a set screw (B) screwed in from the front substantially perpendicular to the cut groove (31). Since the nut (N) is deformed so as to be closed from the entrance of the split groove (31), the center lock nut (N) is connected to the center shaft (2).
0) resulting in being kept in a completely locked state,
Even if the vehicle is repeatedly subjected to sudden braking or other vibrations or shocks while traveling on a general road, there is no possibility of rattling, loosening, seizure or the like.

Further, unlike the known invention described at the beginning, the distortion split groove (31) is cut into a center lock nut (N) that is independent of the center shaft (20). It is not necessary to extend such stays (23) and (24) inwardly and screw a set screw (27) for closing the split groove (22) into the stay.
A very simple configuration is sufficient, and the mass production effect can be maximized. Of course, the axle screw tip (5
3) protrudes long into the hollow center shaft (20), and to which a hub fixing nut (52) is fastened, even if it is a vehicle type, to which a set screw (3) for closing the split groove (31) is provided. There is no fear that B) will interfere, and the versatility to all types of vehicles is remarkably excellent.

Since there is no possibility that the center lock nut (N) is seized to the male screw (21) of the center shaft (20), the set screw (B) is loosened by manual operation.
By releasing the deformed state of the center lock nut (N), the center lock nut (N) can be pulled out forward from the center shaft (20) to quickly perform the attachment / detachment / replacement work of the wheel.

In this case, even if the center lock nut (N) is accidentally overtightened accidentally or if a seizure accident occurs during use, only the center lock nut (N) is destroyed. It is sufficient to replace the adapter with a new one, and it is not necessary to replace the expensive adapter (A) as in the above-mentioned known invention.

The above effects can be obtained by forming the center shaft (20) into a relatively thin solid cylindrical shape as described in claim 2, and integrating the center shaft (20) forward from the top surface (42) that closes the distal end of the adapter (A). And press the collar (C) of the wheel disc (D) into the center shaft (20) from the front, and the center lock nut (N).
However, it can be achieved in exactly the same manner.

At this time, the center lock nut (N) is cut into the relatively small center lock nut (N) which is independent and independent of the center shaft (20). The operation of deforming (N) is extremely easy, and the problem of the known invention described at the beginning is solved.

In any case, if the configuration of claim 3 is adopted, the strength of the center lock nut (N) itself can be prevented from lowering due to the cut of the distortion split groove (31).
The center lock nut (N) can be reliably deformed and deformed from the entrance of the split groove (31) by one relatively small set screw (B), and the operability is further improved. Become.

In particular, if the structure of claim 4 is adopted,
One set screw (B) is inserted from the front almost perpendicularly to the split groove (31) to the female screw (35) through the stepped fool hole (32) opened at the eccentric position of the center lock nut (N). If you screw it in and tighten it up,
The split groove (31) is surely deformed and deformed so that it smoothly closes from its entrance, which is also very useful for improving operability.

If the structure of claim 5 is adopted, even if the center lock nut (N) is circular, a plurality of locking grooves (38) distributed on the front surface of the center lock nut (N) are selected. The center lock nut (N) can be rotated without any trouble by inserting and locking the locking pin (39) of the special rotation operation tool (T) so that it can be freely inserted and removed, and the special rotation can be performed. In the sense that the center lock nut (N) cannot be rotated unless the moving operation tool (T) is used, there is an effect to help prevent theft of the wheel.

Further, if the configuration of claim 6 is adopted,
The center lock nut (N) can be conveniently pressed down and fixed to the automatic centering state with the wheel disc (D) by the conical stop flange (28), and a separate center cap (40) can be attached to the hollow center. Shaft (20)
Into the center shaft (2
0) and set screw (B), as well as the above-mentioned turning operation tool (T)
There is also an effect that the locking concave groove (38) can be covered and coated to protect it from dust and dirty water.

[Brief description of the drawings]

FIG. 1 is an overall schematic front view of a vehicle wheel to which a first embodiment of the present invention is applied.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged sectional view corresponding to FIG. 2, showing the center lock nut in an exploded state.

FIG. 4 is a front view showing the adapter of FIG. 1 extracted.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

FIG. 6 is a perspective view showing a center lock nut extracted.

FIG. 7 is a front view of FIG. 6;

FIG. 8 is a side view of FIG. 7;

FIG. 9 is a sectional view taken along line 9-9 of FIG. 8;

FIG. 10 is a sectional view taken along line 10-10 of FIG. 9;

FIG. 11 is a perspective view showing a special turning operation tool of the center lock nut.

FIG. 12 is a front view corresponding to FIG. 7 and showing a modified embodiment of the center lock nut.

FIG. 13 is a side sectional view of a modified embodiment in which a center lock nut is covered and decorated.

FIG. 14 is a side sectional view corresponding to FIG. 2, showing a second embodiment of the present invention.

FIG. 15 is a front view showing a center axis extracted from FIG. 14;

FIG. 16 is a front view of FIG. 14;

[Explanation of symbols]

 (10) Boss (14) Torque pin (18) Hub (19) Body (20) Center shaft (21) Male screw (23) Mounting flange (24) Torque pin receiving hole (25) Stud bolt (26), hub nut (27), stud bolt receiving hole (28), restraining flange (31), split groove for distortion (32), stupid hole (33), head (35), female screw (36)・ Shaft (38) ・ Locking groove (40) ・ Center cap (42) ・ Top surface (A) ・ Adapter (B) ・ Set screw (C) ・ Presser collar (D) ・ Wheel disc (N) ・Center lock nut (T), rotation operation tool (OO), rotation axis (XX), imaginary line (α), constant angle range (β), constant angle pitch

Claims (6)

[Claims] 1. A large diameter mounting from the base end of a conical body (19) which fits into a boss (10) of a wheel disc (D) in an overall top hat type or cylinder hat type adapter (A). Overhang the flange (23)
The torque pin receiving hole (2
4) and a plurality of stud bolt receiving holes (27) are formed as radially symmetric distribution types of two types alternately scattered, while a hollow center shaft (17) forming a tip of the conical body (19) is formed. On the outer peripheral surface of 20), an external thread (21) for screwing with the center lock nut (N) is engraved. First, the adapter (A) is attached to the axle hub (18) so as to be attached thereto. The stud bolt receiving hole (27) of the flange (23) is completely fitted from the hub (18) of the axle to the stud bolt (25) which is integrally planted, and the hub nut (26) is inserted into the stud bolt (25) from the front. Then, the wheel disc (D) is attached to the adapter (A) in order to attach the wheel disc (D) to the adapter (A).
A torque pin (14) integrally projecting rearward from the boss (10) of the center shaft (20) is completely pressed into the torque pin receiving hole (24) of the mounting flange (23). (21) A center lock device for an automobile wheel for pressing and fixing the wheel disc (D) by screwing a center lock nut (N) from the front to the outer peripheral surface of the center lock nut (N). The center lock nut is formed by cutting a split groove for distortion (31) into a predetermined angle range (α) and tightening a set screw (B) screwed in from the front substantially perpendicular to the split groove (31). A center lock device for an automobile wheel, wherein (N) is set so as to be deformed and deformed so as to be closed from an entrance of the split groove (31). 2. A mounting having a large diameter from a base end of a cylindrical body (19) fitted with a boss (10) of a wheel disc (D) in an overall top hat type or cylinder hat type adapter (A). Overhang the flange (23)
The torque pin receiving hole (2
4) and a plurality of stud bolt receiving holes (27) are formed as radially symmetric distribution types in which two kinds thereof are alternately scattered, while a top surface (27) for closing a tip portion of the cylindrical body (19). 4
2) A center lock nut (N) is attached to the outer peripheral surface of a solid center shaft (20) that protrudes vertically from the
First, in order to mount the adapter (A) to the hub (18) of the axle, the stud bolt receiving hole (27) of the mounting flange (23) is engraved. The hub nut (26) of the axle is fitted into a stud bolt (25) which is integrally planted, and a hub nut (26) is screwed into the stud bolt (25) from the front, respectively. ) To attach the wheel disc (D) to the wheel disc (D)
A torque pin (14) integrally projecting rearward from the boss (10) is pressed into the torque pin receiving hole (24) of the mounting flange (23), and finally the center shaft (20) is inserted from the front. The presser collar (C) of the wheel disc (D) is fitted, and the center lock nut (N) is screwed and fastened to the male screw (21) of the center shaft (20). In the center lock device for an automobile wheel to be pressed and fixed, a split groove for distortion (31) is cut into the outer peripheral surface of the center lock nut (N) by a certain angle range (α), so that the split groove (31) is substantially aligned with the split groove (31). The center lock nut (N) is closed from the inlet of the split groove (31) by tightening the set screw (B) screwed in from the orthogonal front. A center lock device for a vehicle wheel, wherein the center lock device is set to be deformed and deformed. 3. A fixed angle range (α) of the distortion groove (31).
Is set to about 200 ° to 260 °, a cut is made on the outer peripheral surface of the center lock nut (N), and an imaginary line (X−
3. The center lock device for a vehicle wheel according to claim 1, wherein one of the set screws (B) is arranged on the X). 4. A stepped configuration in which a large-diameter head (33) of a set screw (B) is immersed substantially in the front half of a center lock nut (N) branched by cutting the split groove for distortion (31). Of the set screw (B) into the rear half of the center lock nut (N).
4. A center lock device for a vehicle wheel according to claim 1, wherein the female screw (35) screwed to the above (6) is bored so as to communicate with each other. 5. A center lock nut (N) is formed in a circular shape, a female screw (35) screwed and fastened to a set screw (B) on the front surface thereof, and a special turning operation tool (T). 4. The automotive vehicle according to claim 1, wherein the plurality of locking recesses (38) for receiving the pins of (1) and (2) have openings distributed at a constant angular pitch (β). Wheel center locking device. 6. A center lock nut (N) is formed in a circular shape, and a large-diameter conical stop flange (28) for holding down a wheel disc (D) is projected from a rear end of the center lock nut (N). The center cap (40) is inserted into and removed from the hollow center shaft (20) from the front so as to be freely inserted and locked, and the center cap (40) is used to lock the hollow center shaft (20).
2. The center lock device for a vehicle wheel according to claim 1, wherein the lock screw and the set screw (B) are covered.