WO2018181078A1

WO2018181078A1 - Washer-equipped wheel nut and tightener for washer-equipped wheel nut

Info

Publication number: WO2018181078A1
Application number: PCT/JP2018/011951
Authority: WO
Inventors: 彰善増澤; 一人平野
Original assignee: 彰善増澤; 一人平野
Priority date: 2017-03-31
Filing date: 2018-03-25
Publication date: 2018-10-04

Abstract

[Problem] To provide: a wheel nut which is capable of being easily tightened with predetermined torque and which does not damage a wheel; and a tightener for a wheel nut. [Solution] Provided is a washer-equipped wheel nut provided with a washer which has a washer upper surface located outside the outer periphery of the wheel nut in a plan view and which is rotatable about the same axis as the wheel nut. The upper surface has formed therein recesses open to the upper surface side and outer peripheral side of the washer. The nut box of a tightener is fitted to the wheel nut, the brace body of a reaction box is engaged with the recesses in the washer, and the nut box and the reaction box are rotated in the opposite directions by a direct current electric motor to tighten the wheel nut, the direct current motor having preset output torque. The brace body is engaged with the recesses and is in an affixed state, and consequently the rotation of the nut box is stopped when the force of tightening the wheel nut reaches predetermined torque. As a result, the wheel nut is tightened with predetermined torque.

Description

Wheel nut with washer, and wheel nut tightening machine with washer

The present invention relates to a wheel nut with a washer for a vehicle and a wheel nut tightening machine with a washer.
More specifically, the present invention relates to a wheel nut with a washer for a large vehicle and a wheel nut tightening machine with a washer.
More specifically, the present invention relates to a wheel nut with a washer capable of tightening a wheel nut for a large vehicle with a predetermined torque, and a wheel nut tightening machine with a washer.

Various structures for attaching the tire T to the vehicle have been proposed. Generally, as shown in FIGS. 10 to 12, the tire T is protruded at an equal pitch on the side surface of the brake drum constituting a part of the axle portion 2. 8 or 10 wheel bolts 4 are passed through the bolt holes 8 drilled in the disk wheel 6D of the wheel 6, and a tapered nut 12 is screwed into the wheel bolt 4 and fixed by tightening with a predetermined torque. Has been. To tighten with a predetermined torque, a known torque wrench 14 is used. In the case of large trucks and buses, the tightening torque is 550 to 600 N · m. Therefore, the torque wrench 14 becomes heavier as the size increases, and the handleability is lowered. Furthermore, since 8 or 10 wheel bolts 4 are used for large trucks and buses, 32 or 40 wheels must be tightened with a torque wrench even if the front and rear wheels are 4 wheels. It ’s been hard work.
If the wheel nut is not tightened with the prescribed torque, it will result in wheel disengagement during travel, which is worst and life-threatening. Visual inspection and tapping inspection before every operation are recommended and every 3 and 12 months. Periodic inspection is required.
However, as described above, since the tightening inspection of the wheel nut using the torque wrench 14 is heavy labor, it may not be executed in accordance with laws and regulations, and wheel dropout may occur rarely. For example, this is a case where a pneumatic nut type impact driver is used to travel without using a torque wrench 14 with a wheel nut tightened.
Therefore, the following technique has been proposed in order to allow the wheel nut to be tightened with a predetermined torque without using the torque wrench 14.
As a first conventional technique, when a fastened body is fastened with a bolt and a nut, a ring-shaped elastic body is disposed between the fastened body and the nut, and the elastic body has an outer peripheral end portion. There is known an axial force visualizing device characterized in that the constant width is color-coded into colors different from those on the inner peripheral side (see, for example, Patent Document 1).
As a second prior art, a wheel nut including a body having a longitudinal axis, wherein the body having an axial threaded opening and a pair of ends includes a conical outer surface at one of the ends and the A spanner flat on the other of the ends, means for forming a stop surface on the body extending radially outward of the conical outer surface, the stop surface being substantially perpendicular to the longitudinal axis And generally present in a plane intersecting the conical surface, thereby engaging the stop surface and movement of the conical surface in the longitudinal direction of the shaft during use of the wheel nut A wheel nut capable of attaching a wheel to an automobile, wherein the wheel nut is internally threaded and aligned with the threaded member and the threaded member and end end In the washer having a relationship in contact with a washer which the conical surface on said washer, which are located, a wheel nut which consists in having a known (e.g., see Patent Document 2).
As a third prior art, a nut formed by massive forming, for example, cold and / or hot extrusion, which is additionally molded or additionally coupled with a working portion for engaging a tool, for example, a multi-angle head A pressure washer, the pressure washer comprising, for example, a contact surface to a component such as a rim and a sleeve-like clamping area, the clamping area comprising a pressure washer of the working part Is formed on the opposite side, has a longitudinal slit, and at least the inside of this section is configured in a conical shape with the tip located in the opposite direction to the pressure washer, and the inner thread of the nut In the form of a cylinder extending along the working portion and conically extending along the conical clamping area, both the conically extending inner surface and the slit are formed by massive foaming. Nut, characterized in that there are known, especially wheel nuts (e.g., see Patent Document 3).
On the other hand, a fourth conventional technique is known as a tightening machine having a function of mechanically tightening a nut with a predetermined torque. Schematically, a tightening machine in which a tightening machine main body and a booster unit are coupled via a connecting joint that is detachably fitted to the main body and the unit. The tightening machine main body is connected to a planetary gear mechanism. The external output cylinder and the internal output cylinder that are connected and act on each other in the opposite direction are concentrically provided. The casing of the boosting unit has a reaction force receiving outwardly projecting from the inner teeth of the planetary gear mechanism. An outer box and an inner box are connected to the planetary gear mechanism on the input side of the boosting unit and act on rotational forces in opposite directions, and the output shaft connected to the planetary gear mechanism is projected on the output side. The connecting joint is composed of a cylindrical member and a shaft member that protrudes from both ends of the cylindrical member and is rotatably fitted. The input side of the shaft member is axially connected to the internal output cylinder of the tightening machine body. Engagement part that is slidable and engages with the inner output cylinder so as to rotate together The shaft side is a shaft body that is rotatably fitted integrally with the inner box of the booster unit, and the cylindrical member has a flange that comes into contact with the tip of the outer output cylinder of the tightening machine body, The input side from the flange is a fitting cylinder that fits into the external output cylinder so that it can rotate integrally with the external output cylinder, and the output side from the flange becomes a fitting part that fits into the outer box of the booster unit so that it can rotate integrally. There is known a clamping machine in which a booster unit is detachably connected, characterized in that a notch into which a claw piece projecting from an outer output cylinder of the clamping machine body is fitted is opened (for example, patent document) 4).
Similarly, as a fifth prior art, a clamping machine is provided with a box unit for tightening a reaction force washer fitted on a bolt protruding from a structure and a nut, and the box unit has a tip engaged with the nut. An inner box holder, an outer box formed concentrically with the inner box and having a tip engageable with a reaction force washer, and an inner box holder rotatable in opposite directions, and an outer periphery of the inner box holder In a clamping machine comprising a box unit comprising a formed outer box holder concentrically, an inner box detachably engaged with an inner box holder, and an outer box detachably engaged with an outer box holder. The inner box has a nut side member that can be engaged with the nut and a holder that engages with the inner box holder. The nut side member has nut engaging holes in which six groove portions engaged with the nut are formed at equal intervals in the circumferential direction, and the bottom surface of each groove portion has a width in the circumferential direction. In addition, there is play in the circumferential direction with respect to the nut, and a hexagonal fitting member having the same outer shape as the nut is formed at the tip of the holder side member. There is known a tightening machine including a box unit characterized in that it is fitted in a nut engaging hole of a member with play (see, for example, Patent Document 5).

JP 2002-181019 (FIGS. 1 to 7, paragraphs 0003 to 0005) Japanese Patent No. 3902708 (Figs. 1-6, paragraphs 0005-0016) JP 6-10935 (FIGS. 1 to 3, paragraphs 0003 to 0015) Japanese Patent No. 3322291 (Figs. 1-6, paragraphs 0007-0010) Japanese Patent No. 5635897 (FIGS. 1-16, paragraphs 0012-0016)

In the first prior art, an elastic body in which the constant width of the outer peripheral end is color-coded in a different color from the inner peripheral side is arranged between the nut and the body to be fastened, so that it can cope with the axial force generated by tightening. Thus, the elastic body is compressed. Since this compression amount (deformation amount) depends on the elastic characteristics of the elastic body, by selecting and using an elastic body having appropriate elastic characteristics, the axial force generated in the bolt can be used as the deformation amount of the elastic body. It can be measured by direct visual observation, and the relationship between the axial force of the bolt and the deformation amount of the elastic body is measured and grasped in advance, and the deformation amount of the elastic body when the elastic body is actually used By measuring the width of the color-coded outer peripheral end so as to correspond to the measurement and deformation amount, there is an advantage that the degree of the axial force can be easily and accurately known. However, the elastic body is always in a state in which a high compressive force is applied, and the applied force changes sequentially during traveling, so that the deterioration is severe and there is a problem in durability.
In the second prior art, by appropriately determining the relationship between the tapered surface and the stop surface, it is possible to prevent excessive tightening force from acting on the wheel nut. However, if the tightening force is not excessive, the wheel nut does not advance more than a predetermined position. Therefore, there is an advantage that the aluminum wheel made of a soft material such as aluminum is not damaged and deformed. There is a problem that does not prove that it is tightened.
In the third prior art, since the female screw is formed in a tapered hole having elasticity, there is an advantage that a constant tightening torque can be maintained even when the screwing is repeatedly performed. There is a problem that the tightening torque cannot be proved to be a predetermined value.
In the fourth prior art, since the wheel nut can be tightened by an electric or pneumatic motor, the force work is greatly reduced, but the inner output shaft cylinder of the tightening machine is used as the wheel nut and the outer output shaft is installed. After locking to the washer, the reaction force receiver must be locked to another wheel bolt or wheel nut, and there is a problem that the operation is complicated.
The fifth prior art is easier to operate than the fourth prior art, but, like the fourth prior art, the reaction force receiver must be locked to the adjacent nut, and the work is complicated. There is.

A first object as a basic object of the present invention is to provide a wheel nut with a washer that can be easily tightened with a predetermined torque and that does not damage the wheel.
A second object, which is a subordinate object of the present invention, is to provide a washer-equipped wheel nut tightening machine capable of easily tightening a wheel nut with a predetermined torque.

In order to achieve this object, the first invention according to claim 1 is configured as follows.
A washer-equipped wheel nut provided on a wheel nut and having a washer upper surface positioned outward from the outer periphery of the wheel nut in plan view and having a washer portion rotatable about the same axis as the wheel nut, the washer The wheel nut with a washer is characterized in that a reaction force receiving portion, which is a recess in which an upper surface side and an outer peripheral side of the washer portion are opened, is formed on the upper surface.

The second invention according to the present invention is:
The said reaction force receiving part is a wheel nut with a washer of 1st invention characterized by having predetermined length in planar view circumferential direction.

According to a third aspect of the present invention, the nut portion is a hexagonal nut, the washer portion is circular, and is rotatably supported by a washer holding portion protruding from the back surface of the nut. It is a wheel nut with a washer of 2nd invention.

According to a fourth aspect of the present invention, there is provided a washer portion attached to the nut portion, the washer upper surface being positioned outward from the outer periphery of the nut portion in a plan view and rotatable around the same axis as the wheel nut. A wheel nut with a washer, wherein the nut portion is a hexagonal nut, the washer portion is circular, and is rotatably supported by a washer holding portion protruding from a back surface of the nut portion, and the washer portion The wheel nut with washer is characterized in that a reaction force receiving portion, which is a recess having a predetermined length in the plan view circumferential direction in the plan view, is formed.

According to a fifth aspect of the present invention, the upper surface of the washer is located outside the outer periphery of the nut portion in plan view, and a reaction force receiving portion is formed on the upper surface of the washer. A wheel nut tightening machine used for tightening a wheel nut with a washer having a washer part rotatable around the same axis as the part, wherein the nut is rotated around the axis by driving means capable of setting an output torque, and the nut A nut tightening body fitted to the portion, and on the outer peripheral side of the nut tightening body, is coaxial with the nut tightening body and is driven to rotate in a direction opposite to the nut tightening body. A wheel nut-clamping machine with a washer, characterized by comprising a strut portion positioned at a reaction force receiving portion.

A sixth invention according to the present invention is the wheel nut-clamping machine with a washer according to the fifth invention, wherein the driving means is a DC electric motor.

A seventh invention according to the present invention is the wheel nut tightening machine with a washer according to the fifth invention, wherein the driving means is a pneumatic motor.

An eighth invention according to the present invention is characterized in that the reaction force receiving portion is formed with twelve times the number of tool locking surfaces of the hexagon nut portion (106) at equal intervals. It is a wheel nut with a washer described in 3rd invention.

According to the first invention, the washer upper surface is located outward from the outer periphery of the nut portion in plan view, and the washer portion is rotatable around the same axis as the nut portion, and the washer portion is provided on the upper surface of the washer. The reaction force receiving part which is a recessed part opened in the upper surface side and the outer peripheral side is formed. That is, the reaction force receiving portion that is a recess has a so-called bottom wall. Therefore, a box of driving means capable of adjusting torque is fitted into the nut portion and screwed into the wheel bolt with a predetermined torque, and the tension portion is engaged with the reaction force receiving portion of the washer portion. Since the striking portion is applied to the bottom wall of the reaction force receiving portion which is a concave portion, the striking portion does not contact the disc wheel and does not damage the wheel. Moreover, although the washer part is integrated with the nut part, the washer part can be individually rotated around the same axis. In other words, the nut portion can be rotated with a predetermined torque as described above by the nut tightening body in a state where the protruding portion is stationary by the washer portion. Therefore, the tightening of the nut portion increases the contact pressure of the washer portion with the disc wheel, and the outer periphery of the washer portion extends outward in the circumferential direction from the outer peripheral surface of the nut portion. The frictional force between the disc wheel is larger than the frictional force between the nut part and the washer part. Therefore, even when the nut portion is tightened, the washer portion remains stationary, so that the nut portion can be tightened without damaging the disc wheel. Therefore, the reaction force receiver is locked to the reaction force receiving portion formed on the washer portion, and the nut portion is rotated at a predetermined torque to be tightened until the nut portion does not rotate, thereby tightening the nut portion with the predetermined torque. Can be included. Therefore, according to the first invention, there is an advantage that the first object which is the basic object of the present invention can be achieved.

According to the second invention, since the basic configuration is the same as that of the first invention, the first object which is the basic object in the present invention can be achieved. Furthermore, in the second invention, the reaction force receiving portion is formed to have a predetermined length in the circumferential direction in the plan view. Therefore, by setting the tension part shorter in the circumferential direction than the reaction force receiving part, when setting the tightening machine, even if the phases of the tension part and the reaction force receiving part are slightly shifted, Therefore, there is an advantage that the tightening machine can be easily mounted.

According to the third invention, since the basic configuration is the same as that of the first invention, the first object which is the basic object of the present invention can be achieved. Further, in the third aspect of the invention, the nut portion is a hexagonal nut, the washer portion is circular, and is rotatably supported by a washer holding portion protruding from the back surface of the nut portion. Therefore, since the structure is simple and the manufacture is easy, there is an advantage that it is inexpensive.

According to the fourth invention, since the basic configuration is the same as that of the first invention, the first object which is the basic object in the present invention can be achieved. Further, in the fourth invention, the nut portion is a hexagonal nut, the washer portion is circular, and is rotatably supported by a washer holding portion protruding from the back surface of the nut portion, and the upper surface of the washer portion. A reaction force receiving portion that is a recess having a predetermined length in the circumferential direction in the plan view is formed. Therefore, by forming the strut portion shorter in the circumferential direction than the reaction force receiving portion, the strut portion can be positioned at the reaction force receiving portion even if the phase with the reaction force receiving portion is slightly shifted, and the structure is Since it is simple and easy to manufacture, there is an advantage that it is inexpensive.

According to the fifth invention, when the nut tightening body is fitted to the nut portion, the projecting portion is positioned on the reaction force receiving portion on the washer upper surface, and the driving means is driven, the nut portion and the washer portion are opposite to each other. The nut is screwed into the wheel bolt. As the screwing amount of the nut portion increases, the contact pressure with the disc wheel increases in the washer portion, and the frictional force between them increases, resulting in a stationary state. As a result, the nut tightening body tightens the nut portion in a state where the thrust portion abuts against the reaction force receiving portion of the washer portion and the rotation of the thrust portion is prevented, so that the predetermined torque set by the driving means is used. The nut part can be tightened. In other words, it can be said that the nut portion was tightened with the torque set in the driving means because the nut portion was not rotated by the driving means. Therefore, according to the fifth invention, there is an advantage that the second object can be achieved.

According to the sixth invention, since the basic configuration is the same as that of the fifth invention, the second object of the present invention can be achieved. Further, since the driving means is a DC electric motor, there is an advantage that the torque can be easily changed by controlling the current.

According to the seventh invention, since the basic configuration is the same as that of the fifth invention, the second object which is the basic object of the present invention can be achieved. Further, since the driving means is a pneumatic motor, there is an advantage that the torque can be easily changed by controlling the air pressure.

According to the eighth invention, since the basic configuration is the same as that of the third invention, the first object which is the basic object of the present invention can be achieved. Furthermore, since the number of reaction force receiving parts is twelve that is twice the number of the tool locking surfaces of the hexagonal nut part, the wheel nut is tightened using a wheel nut tightening machine with washer. When tightening, since the engagement area between the tension portion and the reaction force receiving portion is large, there is an advantage that it can be tightened with a large torque.

FIG. 1 is a perspective view from above of a nut portion with a washer according to a first embodiment of the present invention. FIG. 2 is a front view of the wheel nut with a washer according to the first embodiment of the present invention. FIG. 3 is a plan view of the wheel nut with a washer according to the first embodiment of the present invention. 4 is a half cross-sectional view of the wheel nut with a washer according to the first embodiment of the present invention along the line AA in FIG. FIG. 5 is a cross-sectional view of the wheel nut with a washer according to the first embodiment of the present invention taken along line BB in FIG. FIG. 6 is a cross-sectional view of the washer-equipped wheel nut tightening machine according to the first embodiment of the present invention. FIG. 7 is a front view of the box of the washer-equipped wheel nut tightening machine according to the first embodiment of the present invention. FIG. 8 is a cross-sectional view of a state in which a front wheel (single wheel) is fixed using the washer-equipped wheel nut according to the first embodiment of the present invention. FIG. 9 is a cross-sectional view of a state in which the rear disc wheel (double wheel) is fixed using the wheel nut with washer according to the first embodiment of the present invention. FIG. 10: is a top view of the wheel nut with a washer of Example 2 concerning this invention. FIG. 11 is a perspective view for explaining a conventional wheel nut tightening operation. FIG. 12 is a front view for explaining the structure of a conventional wheel nut. FIG. 13 is a sectional view taken along line XX in FIG. 12 for explaining the structure of a conventional wheel nut.

The best mode of the wheel nut with a washer according to the present invention is attached to the wheel nut, and the top surface of the washer is located outside the outer periphery of the nut portion in a plan view and is rotatable around the same axis as the nut portion. A washer-equipped wheel nut comprising a washer, wherein the nut part is a hexagonal nut, the washer is circular, and is rotatably supported by a washer holding part protruding from the back surface of the nut part, The reaction force receiving portions, which are semicircular recesses having a predetermined length in the circumferential direction in the plan view, are opened at the upper surface side and the outer peripheral side of the washer, and twelve times the tool locking surface of the hexagon nut are twelve equally spaced It is a wheel nut with a washer characterized by being formed in.
The best form of the washer-equipped wheel nut tightening machine is attached to the nut portion, and the washer upper surface is located outward from the outer periphery of the nut portion in a plan view, and the reaction force receiving portion is disposed on the washer upper surface. A wheel nut tightening machine used for tightening a wheel nut with a washer provided with a washer formed and rotatable around the same axis as the nut portion,
The nut tightening body that is rotationally driven around the axis by a driving means capable of setting the output torque and is fitted to the nut portion, and on the outer peripheral side of the nut tightening body, is coaxial with the nut tightening body, A washer-equipped wheel, wherein the washer is rotated in a direction opposite to that of the nut tightening body, and includes a tension portion positioned at a reaction force receiving portion on the washer upper surface, and the driving means is an electric motor. It is a nut tightening machine.

First, a washer-equipped wheel nut 100 according to the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same part as a conventional example, and description is abbreviate | omitted.
The wheel nut 100 with a washer has a function of fixing the wheel 6 on which a vehicle tire is mounted to the axle portion 2 of the vehicle, and includes a nut portion 106 and a washer portion 108 in the first embodiment. .

Next, the nut portion 106 will be described.
The nut portion 106 is at least screwed into the wheel bolt 4 and has a function of pressing the disc wheel 6D existing at the center of rotation of the wheel 6 against the axle portion 2 via the washer portion 108, and the washer portion 108 is rotatably held. The first embodiment includes a tool locking portion 106N and a washer holding portion 106W, which are integrally formed of stainless steel.

Next, the tool locking portion 106N will be described mainly with reference to FIGS.
The tool locking portion 106N has a function of engaging a tool, for example, a box wrench. In the present embodiment, the screw hole 106H having a standardized hole diameter d, a two-sided width s, and a diagonal distance e. And a hexagonal nut having a height m. Naturally, a predetermined female screw is formed on the inner peripheral surface of the screw hole 106H.

Next, the washer holding portion 106W will be described mainly with reference to FIG.
The washer holding portion 106W has a function of integrating the washer portion 108 with the nut portion 106 and holding the washer portion 108 so as to be rotatable coaxially with the axis SL of the nut portion 106. In the first embodiment, the back surface of the nut portion 106 is provided. 106B (FIG. 4: Disc wheel 6D side) is formed in a cylindrical shape protruding downward by a predetermined length, and is formed into a straight cylindrical shape having a predetermined outer diameter as shown by a chain line in FIG. However, after the through-hole 108T of the washer portion 108 is fitted to the outside, it is plastically deformed so that the outer diameter is expanded, thereby forming a truncated cone, and the washer portion 108 is connected to the axis SL. The periphery is rotatably supported and is configured to be integrated with the nut portion 106. Note that the washer holding portion 106W can be changed to another mechanism having the same function, and is not limited to this embodiment.

Next, the washer unit 108 will be described.
The washer part 108 is held by the nut part 106 so that the nut part 106 does not slide into contact with the disc wheel 6D, the function as the reaction force receiving member 112, and the nut part 106 by the screwing operation of the wheel nut 100 with a washer. In the first embodiment, the tool is formed in a circular ring shape having a predetermined thickness t (FIG. 4) and a predetermined outer diameter D (FIG. 3). A washer upper surface 108S is located outside the locking portion 106N, a reaction force receiving portion 114 is provided on the washer upper surface 108S, and a through hole 108T is provided in the center.

Next, the reaction force receiving portion 114 will be described.
The reaction force receiving portion 114 has a function of receiving a reaction force of a box for tightening the nut portion 106 to serve as a stationary scaffold. In the first embodiment, the reaction force receiving portion 114 is formed in the washer portion 108 as the reaction force receiving member 112. The recess is a recess having a predetermined length in the circumferential direction of the washer portion 108, and is formed so as to be opposed to the six-surface tool locking portions 106N in the nut portion 106. These reaction force receiving portions 114 are all formed in the same shape, and are formed in a semicircular shape in plan view. However, the shape of the reaction force receiving portion 114 is not limited to this, and may be a rectangle such as a rectangle or a triangle, an ellipse, or the like in plan view. As shown in FIG. 3, the reaction force receiving portion 114 is centered on a point c located slightly outside the outer peripheral edge of the washer portion 108, and has an inner arc side surface 114i located on a circle cr having a predetermined radius r, and The inner circular arc side surface 114i includes a clockwise wall 114C and a reaction force receiving wall 114CC.

First, the bottom wall 114B will be described.
The bottom wall 114B has a function of preventing the striking portion 116 from coming into contact with the disc wheel 6D, and is the bottom of the reaction force receiving portion 114 in the first embodiment. Therefore, the washer portion 108 has a predetermined thickness t1 (see FIG. 5) even in the portion where the reaction force receiving portion 114 is formed. In other words, the washer portion 108 is circular in plan view.

Next, the clockwise wall 114C will be described.
The clockwise wall 114C is a wall with which the side surface of the distal end portion engages when the tension portion 116 of the tightening machine 122 is rotated clockwise in FIG. Therefore, when the nut tightening body 124 for tightening the nut portion 106 of the tightening machine 122 is rotated clockwise for tightening the nut portion 106, the tension portion 116 rotated in the opposite direction is engaged. It is a wall that stands up against the bottom wall 114B to be stopped.

The reaction force receiving wall 114CC will be described.
The reaction force receiving wall 114CC is a wall with which the side surface of the distal end portion engages when the tensioning portion 116 of the tightening machine 122 is rotated counterclockwise in FIG.
Therefore, when the washer portion 108 is stationary and the thrust portion 116 is locked to the reaction force receiving wall 114CC, a predetermined torque set in the driving means 128 is applied to the nut portion 106 with respect to the nut portion 106. Will act.

Next, the through hole 108T will be described.
In order to integrate the washer portion 108 with the nut portion 106, the through hole 108T allows the washer holding portion 106W before being expanded to pass therethrough and the nut portion 106 by the washer holding portion 106W after being expanded in diameter. The movement in the direction along the axis SL is limited, and in the first embodiment, the circular hole is formed in the center of the washer portion 108, and its cross-sectional shape is as shown in FIG. Inverted L-shaped, specifically, an enlarged-diameter hole portion 108C that is separated from the axis SL as it is away from the nut portion 106, and a straight-hole portion 108E that is formed following the enlarged-diameter hole portion 108C. In other words, the inner diameter id of the portion adjacent to the nut portion 106 is the smallest, and after that, after gradually increasing the diameter, it is formed to a predetermined diameter pd. The diameter-enlarged hole portion 108C can be disposed at a portion other than the portion adjacent to the nut portion 106. Thereby, as described above, the washer portion 108 is integrated with the nut portion 106 and can rotate around the same axis SL independently of the nut portion 106.

Next, the tightening machine 122 will be described with reference to FIGS.
The tightening machine 122 has a function of rotating the nut portion 106 with a predetermined torque set in the tightening direction and rotating the washer portion 108 in a direction opposite to the tightening direction of the nut portion 106. In the nut tightening body 124 rotated around the rotation axis RSL, the reaction force box 126 rotated coaxially with the rotation axis RSL, the driving means 128, the nut box reduction gear 132, the reaction force box reduction gear 134, And it is comprised by the current controller 136.

First, the nut tightening body 124 will be described.
The nut tightening body 124 is rotated around the rotation axis RSL by the driving means 128, fitted around the nut portion 106, and has a function of rotating the nut portion 106 in the tightening direction or the loosening direction. Is formed in a cylindrical shape when viewed from the front, and has a regular hexagonal nut hole 124H when viewed from the front. In other words, the nut hole 124H is a regular hexagonal hole when viewed from the front, with six faces surrounded by the engagement face 124P. Therefore, the nut portion 106 is fitted into the nut hole 124H.

Next, the reaction force box 126 will be described.
The reaction force box 126 is disposed outside the nut tightening body 124 and has a function of being rotated around the rotation axis RSL in the direction opposite to the nut tightening body 124 by the driving means 128. A projecting portion 116 which is formed in a cylindrical shape and is semicircular in front view on the inner peripheral surface of the tip is formed opposite to the reaction force receiving portion 114. Specifically, the reaction force box 126 includes a reaction force base portion 126B and a reaction force tip portion 126T.

Next, the reaction force base portion 126B will be described.
The reaction force base portion 126B has a function capable of rotating the outer periphery of the nut tightening body 124 about the rotation axis RSL. In the first embodiment, the reaction force base portion 126B has a circular storage hole 126BH having a predetermined diameter and a predetermined outer diameter. The base side coupling | bond part 126BJ which consists of a cylindrical body and which consists of a level | step-difference part is formed in the front end surface.

Next, the reaction force tip portion 126T will be described.
The reaction force front end portion 126T fits with the washer portion 108 and has a function of positioning the stretched portion 116 on the reaction force receiving portion 114. In the first embodiment, the outer diameter and the reaction force base portion 126B are the same. It is constituted by a cylindrical body having an inner diameter, and a plurality of, ie, six, projecting portions 116 are formed at regular intervals corresponding to the reaction force receiving portions 114 on the inner peripheral surface of the tip portion. That is, the reaction force tip portion 126T has a generally circular receiving opening 126o. Since the reaction force receiving portion 114 is formed so as to be opposed to the tool locking portion 106N of the nut portion 106, six strut portions 116 are formed at equal intervals. The projecting portion 116 is semicircular when viewed from the front, and is formed slightly longer than the height of the reaction force receiving portion 114, and the tip surface thereof coincides with the end surface of the reaction force tip portion 126T. Therefore, when the projecting portion 116 is positioned on the reaction force receiving portion 114 and the tip thereof hits the bottom wall 114B, a gap of thickness t1 is formed between the end surface of the reaction force tip portion 126T and the bottom wall 114B of the washer portion 108. Is formed. Further, a reaction force side coupling portion 126TJ fitted to the base side coupling portion 126BJ is formed on the reaction force base portion 126B side end surface. In other words, the width of the tension portion 116 is shorter than the circumferential length of the reaction force receiving portion 114 in the circumferential direction of the reaction force box 126, and the length ratio is 1/3 or less. Preferably there is. This is because the reaction box 126 can be easily positioned. In the first embodiment, first, after the nut tightening body 124 is housed in the housing hole 126BH and drivingly connected to the nut box speed reducer 132, the reaction force side coupling portion 126TJ of the reaction force distal end portion 126T is connected to the base side. The coupling portion 126BJ is fitted and integrated, and is firmly fixed by a fixing means (not shown). In this state, the tip of the nut tightening body 124 is close to the inner end surface of the projecting portion 116, and the nut hole 124H is positioned inside the front-view receiving opening 126o. The reaction force box 126 does not need to be positively rotated in the reverse direction with respect to the nut tightening body 124, and may be rotated in the reverse direction relative to the nut tightening body 124. In other words, with respect to the rotation of the nut tightening body 124, it is stationary or rotated in the same direction as the nut tightening body 124. Cases are also included in the concept of reverse rotation. In a state where the tensioning part 116 is positioned on the reaction force receiving part 114, the tip of the tensioning part 116 comes into contact with the bottom wall 114B and cannot move further to the disk wheel 6D side. In other words, since a gap is formed between the end surface of the reaction force box 126 and the disc wheel 6D, even if the reaction force box 126 rotates, the disc wheel 6D is not damaged.

Next, the driving means 128 will be described.
The driving means 128 has a function of rotating the nut tightening body 124 in the tightening direction of the nut portion 106 and rotating the reaction force box 126 in a direction opposite to the nut tightening direction with a predetermined torque. An electric motor 138 is used. This is because the torque of the DC electric motor 138 can be easily changed by changing the current value per unit time. However, a pneumatic motor can be used as the driving means 128. This is because the torque of the pneumatic motor can be easily changed by changing the air pressure as a drive source.

Next, the nut box speed reducer 132 will be described.
The nut box speed reducer 132 has a function of decelerating the rotation of the driving means 128 and rotating the nut tightening body 124 in the tightening direction of the nut portion 106 at a predetermined speed. A reduction gear is used.

Next, the reaction box reduction gear 134 will be described.
The reaction force box speed reducer 134 has a function of decelerating the rotation from the driving means 128 and rotating the reaction force box 126 at a predetermined speed in a direction opposite to the rotation direction of the nut tightening body 124. 1, the nut box speed reducer 132 is rotated by the gear means 142 in the reverse direction at a predetermined speed. However, it can be changed to another mechanism having a similar function.

Next, the current controller 136 will be described.
The current controller 136 has a function of adjusting the rotational torque of the DC electric motor 138, and a known current controller is used. Therefore, in addition to the current controller 136, other devices that can control the torque can be employed.

Next, the operation of the first embodiment will be described with reference to FIGS.
First, when the wheel 6 with the tire T is attached to the axle portion 2 of the vehicle, the bolt hole 8 formed in the wheel 6 is fitted to the wheel bolt 4, and then the wheel nut 100 with washer according to the present invention is used. All the wheel bolts 4 are screwed together and temporarily tightened in a predetermined order using a pneumatic motor type impact driver or the like. Next, each washer-equipped wheel nut 100 is tightened with a predetermined tightening torque in a predetermined order using the tightening machine 122. That is, the current supplied to the DC electric motor 138 is adjusted so that the tightening torque of the wheel nut 100 with washer by the nut tightening body 124 is 550 to 600 N · m, and then the wheel with washer is used with the tightening machine 122. Tighten the nut 100.
FIG. 9 is an example in which one wheel 6 is attached to one end of the axle portion 2, and one wheel 6 and therefore a disc wheel 6D is attached to the wheel bolt 4, and is temporarily attached by a wheel nut 100 with a washer. It is in a stopped state. FIG. 10 shows an example in which two wheels 6 are attached to one end of the axle portion 2. The wheel bolt 4 penetrates with two disc wheels 6D adjacent to each other, and is temporarily fixed by a wheel nut 100 with a washer. State. Thereafter, final tightening is performed with a predetermined torque.
Specifically, first, the tightening machine 122 is operated, and is stopped in a state where the projecting portion 116 is positioned at the approximate center of the engagement surface 124P in the nut hole 124H, as shown in FIG.
Next, the nut tightening body 124 is fitted into the nut portion 106 of the wheel nut 100 with washer. At this time, the thrusting portion 116 of the reaction force box 126 is also inserted into the reaction force receiving portion 114 of the washer portion 108. The tightening machine 122 cannot advance to the disc wheel 6D side after the end surface of the tensioning part 116 hits the bottom wall 114B. In other words, the reaction force box 126 does not contact the disc wheel 6D.
Next, the DC electric motor 138 is operated, the nut tightening body 124 is rotated in the tightening direction of the nut portion 106, in the direction of the arrow X in FIG. 6, and the reaction force box 126 is rotated in the direction of the arrow CX in FIG. As a result, the nut portion 106 moves toward the disc wheel 6D together with the washer portion 108, and presses the washer portion 108 against the disc wheel 6D. Further, since the thrusting portion 116 comes into contact with the reaction force receiving wall 114CC of the reaction force receiving portion 114 by rotating the reaction force box 126 in the direction of the arrow CX in FIG. 6, the disc wheel 6D and the washer back surface 108B of the washer portion 108 If the friction force between the two exceeds the torque set in the DC electric motor 138, the washer portion 108 cannot be rotated by the reaction force box 126. On the other hand, when the progress resistance due to the tightening of the nut portion 106 by the nut tightening body 124, and therefore the tightening torque of the nut portion 106 exceeds the torque set in the DC electric motor 138, the nut tightening body 124 is not rotated. In this situation, the reaction force box 126 interlocked with the nut tightening body 124 is in a state in which the tensioning portion 116 is locked and fixed to the reaction force receiving portion 114, so the nut tightening body 124 is set. It can be said that it is rotationally driven with the torque generated. Therefore, the nut portion 106 is tightened with a predetermined torque.

Next, Example 2 will be described with reference to FIG.
The second embodiment is an example in which the number of reaction force receiving portions 114 is twice that of the tool locking surface 106P in the nut portion 106 as compared to the first embodiment. However, the number of reaction force receiving portions 114 can be a number that is not limited to an integral multiple of the tool locking surface 106P. The same functional parts as those in the first embodiment are denoted by the same reference numerals, and different configurations will be described. The reaction force receiving portion 114 of the second embodiment is provided with twice the number of the tool locking surfaces 106P of the nut portion 106. That is, since the nut portion 106 of the second embodiment is a hexagonal nut, twelve reaction force receiving portions 114 are provided, and their pitches are the same. In other words, the twelve reaction force receiving portions 114 are provided at equal intervals. The reaction force receiving portion 114 is doubled as compared with the first embodiment, and as a result, the tension portion 116 of the reaction force box 126 can be doubled. As a result, the number of the tension portions 116 and the reaction force receiving portions 114 is increased, so that the contact area between the tension portion 116 and the reaction force receiving portion 114 is increased, and the contact between the tension portion 116 and the reaction force receiving portion 114 is increased. The transmission force can be increased. Accordingly, there is an advantage that the tightening force by the nut tightening body 124 can be increased.

SL axis
RSL rotation axis
100 Wheel nut with washer.
106 Nut
106W washer holder
108 Washer
106B reverse side
108S washer top
114 Reaction force receiver
116 Strut
122 Tightening machine
124 Nut tightening body
128 Drive means
138 DC electric motor

Claims

A washer portion attached to the nut portion (106) and having a washer upper surface (108S) positioned outside the outer periphery of the nut portion (106) in plan view and rotatable around the same axis as the nut portion (106) A washer-equipped wheel nut provided with a reaction force receiving portion (114) that is a recess in which an upper surface side and an outer peripheral side of the washer portion (108) are opened. A wheel nut with a washer, characterized by
The wheel nut with washer according to claim 1, wherein the reaction force receiving portion (114) has a predetermined length in a circumferential direction in a plan view.
The nut portion (106) is a hexagonal nut, the washer portion (108) is circular, and is rotatably supported by a washer holding portion (106W) protruding from the back surface (106B) of the nut portion (106). The wheel nut with washer according to claim 2, wherein the wheel nut is provided.
A washer portion attached to the nut portion (106) and having a washer upper surface (108S) positioned outside the outer periphery of the nut portion (106) in plan view and rotatable around the same axis as the nut portion (106) A washer-equipped wheel nut comprising (108), wherein the nut portion (106) is a hexagonal nut, the washer portion (108) is circular, and from the back surface (106B) of the nut portion (106) A reaction force receiving portion which is a concave portion having a predetermined length in the circumferential direction in a plan view while being rotatably supported by the protruding washer holding portion (106W) and having an upper surface side and an outer peripheral side of the washer portion (108) opened. (114) is formed, The wheel nut with a washer characterized by the above-mentioned.
Attached to the nut portion (106), the washer upper surface (108S) is located outside the outer periphery of the nut portion (106) in plan view, and a reaction force receiving portion (114) is formed on the washer upper surface (108S). A wheel nut tightening machine used for tightening a wheel nut with a washer provided with a washer portion (108) rotatable around the same axis as the nut portion (106), and driving means capable of setting an output torque ( 128) and a nut tightening body (124) fitted to the nut portion (106) and rotated around the axis, and on the outer peripheral side of the nut tightening body (124), the nut tightening body (124) and a nut (116) that is driven to rotate in the opposite direction to the nut tightening body (124) and is located on the reaction force receiving portion (114) of the washer upper surface (108S). A wheel nut tightening machine with a washer.
6. The wheel nut tightening machine with washer according to claim 5, wherein the driving means is a direct current electric motor (138).
The wheel nut tightening machine with washer according to claim 5, wherein the driving means is a pneumatic motor.
The twelve reaction force receiving portions (114) are formed at equal intervals, twelve times the tool locking surface (106P) of the hexagon nut portion (106). Wheel nut with washer.