JP2002178702A - Nut assembly and nut assembly with axial force display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nut assembly capable of controlling axial force for pressing down a wheel, and a nut assembly with an axial force display device. SOLUTION: This nut assembly is composed of a nut A11 for threadedly engaging with a bolt on the inner periphery by applying fastening torque, a nut B12 relatively rotatable to the nut A, movable in the shaft direction, and pressed down in the shaft direction to a nut seat surface, and a disc spring 13 installed between the nut A and the nut B. This nut assembly with the axial force display device is composed of the nut assembly 10 and the axial force display device 20, and is composed of a lighting device 30, cushion rubber 43 arranged on an opposite side end surface of the nut B of the nut A, and a lighting holding releasing device 40 movably installed in the shaft direction on the nut A via the cushion rubber, and holding and releasing lighting of the lighting device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut assembly and a nut assembly with an axial force indicating device, and can be used, for example, for hub nuts of large and medium-sized wheels (wheels for trucks and buses).

[0002]

2. Description of the Related Art At present, the tightening force of truck and bus wheels on a hub is managed by controlling the tightening torque of a hub nut with a torque wrench or the like.

[0003]

However, roughening of the wheel nut seat surface due to rotation of the hub nut spherical surface with high axial force applied to the spherical seat of the hub hole of the wheel,
When the specified torque is generated due to roughening of the nut surface, a phenomenon occurs in which the specified axial force (wheel pressing force) is not generated. Therefore, in the actual market, the tightening is performed with a torque larger than the designated torque at present. For this reason, the hub bolt is also broken. An object of the present invention is to provide a nut assembly that can control an axial force that presses a wheel. Another object of the present invention is to provide a nut assembly with an axial force display device that can manage the axial force that presses the wheel and can display that the axial force is within an appropriate range.

[0004]

The present invention to achieve the above object is as follows. (1) A nut A that is tightened with a torque and is screwed into a bolt at the inner periphery; a nut B that is rotatable and axially movable relative to the nut A and is pressed axially against a nut seat surface; The nut A is mounted between the nut A and the nut B, and the nut A is tightened by the tightening torque applied to the nut A.
And a disc spring that converts the tightening torque applied to the nut A into an axial force while compressively deforming the spring seat when the distance between the spring seats of the nut B is reduced, and applies the axial force to the nut B. (2) The nut assembly is composed of a nut assembly and an axial force display device. The nut assembly is subjected to a tightening torque, and a nut A screwed into a bolt on an inner periphery thereof, and is rotated and axially moved relative to the nut A. It is possible to install the nut B between the nut A and the nut B, which is axially pressed against the nut seat surface, and when the distance between the spring seats of the nut A and the nut B is reduced by the tightening torque applied to the nut A, A disc spring that converts a tightening torque applied to the nut A into an axial force while compressively deforming the axial force and applies the axial force to the nut B. The axial force indicating device moves in the axial direction with respect to the nut A. A lighting device mounted on the nut A so as to be lit when pressed, a cushion rubber arranged on the end face of the nut A opposite to the nut B, and a cushion rubber on the nut A And a lighting holding / releasing device for holding and releasing the lighting of the lighting device, including a main body B mounted to be movable in the axial direction through the nut assembly. (3) Two sets of lighting devices of the axial force display device are provided, and lighting timings of the two sets of lighting devices with respect to deformation of the disc spring are different from each other. A diode, a battery, a biasing member for biasing the light emitting diode to a side protruding from the nut A, and a push-up pin having one end protruding from the nut A toward the disc spring and the other end contacting the battery. The nut assembly with an axial force display device according to (2). (4) A main body A in which the lighting holding / releasing device of the axial force display device is attached to a hub bolt by a stopper bolt.
And can be moved in the axial direction with respect to the main body A and can be rotated. The lighting device is pushed only by the nut A when in the lighting device pushing position, and the pressing on the nut A is released. When the lighting device is released from the lighting device pressing position and is in the lighting device pressing release position, the cushion is moved in a direction away from the lighting device together with the main body A by the cushion, and a body B that releases the pressing of the lighting device,
An M-groove formed in the main body A, an L-groove connected to the M-groove and located farther from the nut A than the M-groove, a stopper pin radially spring-biased from the main body B toward the main body A, A rotating spring for biasing the main body B relative to the main body A so that the main body B is returned to the normal position when the main body B is rotated from the normal position; and a presser mounted on the main body B and pressing the lighting device. A nut assembly with an axial force display device according to (2), comprising a pin and a pin.

[0005] In the nut assembly (1), the nut B does not rotate or hardly rotates with respect to the nut seat surface, and is merely pressed in the axial direction against the nut seat surface. Does not cause skin roughness due to rotational sliding, does not affect the axial force accuracy due to the skin roughness, and can manage the axial force with higher accuracy than before. Therefore, it is not necessary to tighten with a torque larger than the designated torque, and it is possible to prevent the bolt from being broken due to excessive tightening. In the nut assembly with the axial force display device of the above (2), the axial force display device is provided, and since the axial force display device has the lighting device, the lighting device is illuminated within a proper range of the deformation of the disc spring. By doing so, it can be detected and confirmed that the axial force is within the appropriate range. In addition, since the axial force display device has the lighting holding / releasing device, the lighting device is released from lighting after confirming that the axial force is at an appropriate level, thereby extending the life of the battery of the lighting device. In the nut assembly with the axial force display device of the above (3), two sets of lighting devices of the axial force display device are provided, and if the lighting timings of the two sets of lighting devices are different from each other with respect to the degree of deformation of the disc spring. By setting the lighting timing so that one set of lighting devices is turned on when the appropriate axial force is reached, and the other set of lighting devices is turned on when the appropriate axial force is exceeded, without lighting, In the lighting of only one set of lighting devices that has not reached the specified axial force, the lighting of two sets of lighting devices in the appropriate axial force range is:
You can see that there is too much axial force. The above (4)
In the nut assembly with the axial force display device, the lighting holding / releasing device of the axial force display device includes the main body A, the main body B, and the M
Groove, L groove, stopper pin, rotation spring,
At the time of initial tightening, the axial force display device is attached to the nut assembly and the main body B is pressed to make the cushion in a compressed state, and the stopper pin is inserted into the M groove so that the main body B of the lighting holding / releasing device is provided. Is locked in the lighting device pushing position, and in this state, tightening is performed by applying torque to the nut A, and tightening until two sets of the lighting devices are turned on. Then, the nut A is slightly turned to the opposite side to turn only one set of the lighting devices. By loosening so that lights up, it is possible to set an appropriate axial force. Next, the main body B is rotated with respect to the main body A, and the stopper pin is inserted into the L groove, whereby the main body B and the holding pin move in a direction away from the lighting device, and the main body B moves to the lighting device pressing release position, and the light is turned on. The device goes off. As a result, the lighting device does not remain lit during use, and battery consumption is prevented. To confirm that the axial force is maintained in the proper range during use, press the main body B, insert the stopper pin into the M groove, set the main body B of the lighting holding / releasing device to the lighting device pushing position, and set one lighting It is only necessary to confirm that only the device is turned on. After confirmation, rotate the body B again to the body A and insert the stopper pin into the L groove,
The main body B is moved to the lighting device pressing release position, and the lighting device is turned off.

[0006]

FIG. 1 shows a nut assembly and a nut assembly with an axial force display device according to an embodiment of the present invention.
This will be described with reference to FIGS. As shown in FIGS. 1 and 2, a nut assembly 10 according to the embodiment of the present invention includes a nut A1.
1, a nut B12, and a disc spring 13. The nut A11 has a hexagonal outer portion 14 to which a tightening torque can be applied.
, And has a screw portion 15 on the inner periphery, and the screw portion 15 is screwed to a bolt 16 (for example, a hub bolt, see FIGS. 5 and 7). The nut B12 is rotatable and axially movable relative to the nut A11, and is axially pressed against the nut seating surface 17 (the hub nut seating surface of the wheel disc 18). The disc spring 13 is a spring continuous in the circumferential direction, and is mounted between the nut A11 and the nut B12.
When the distance D between the spring seats of the nut A11 and the nut B12 is reduced by the tightening torque applied to the nut 11, the disc spring itself compresses and deforms, while converting the tightening torque applied to the nut A11 into an axial force and applying the axial force to the nut B12. .
The tip 19 of the nut A is swaged to prevent the nut B12 from falling off the nut A11.

In the nut assembly 10, when the nut A11 is tightened by applying a torque, the nut B12 does not rotate or hardly rotates with respect to the nut seat surface 17, and is merely pressed against the nut seat surface 17 in the axial direction. It is. The rotation of the nut A11 is performed by the nut A11 and the disc spring 13
At the contact portion between the nut B12 and the disc spring 13. Therefore, the spherical surface of the nut B12 and the nut seating surface 17 do not suffer from rough surface due to rotational sliding, the axial force accuracy is not affected by the rough surface, and it is possible to manage the axial force with higher accuracy than before. it can. Axial force itself can be managed instead of torque management.
Therefore, it is not necessary to tighten with a torque larger than the designated torque, and it is possible to prevent the bolt from being broken due to excessive tightening.

[0008] The nut assembly 1 with an axial force display device according to the embodiment of the present invention comprises a nut assembly 10 and an axial force display device 20. The nut assembly 10 is the same as the nut assembly 1 described with reference to FIGS.
Same as 0. As shown in FIGS. 3 and 4 and FIGS. 1 and 2, the axial force display device 20 includes a lighting device 30 and a lighting holding / releasing device 40. 5 to 8 show an assembly of the nut assembly 10 and the axial force display device 20. The lighting device 30 is axially movable with respect to the nut A11 as shown in FIGS.
The device is urged in a direction to protrude from and is mounted on the nut A11, and is turned on when pressed. As shown in FIGS. 3 and 4, the lighting holding / releasing device 40 includes a lighting device 30.
The device comprises a device for holding (maintaining a lit state) and canceling (turning off a lit one).

The lighting devices 30 of the axial force display device 20 are provided in two sets, and the lighting timings of the two sets of lighting devices with respect to the deformation of the disc spring 13 are different from each other.
Each set of lighting devices 30 includes a light emitting diode 31 and a battery 32 that supplies electricity to the light emitting diode 31 when pressed from the light emitting diode 31 to light the light emitting diode 31.
(For example, a lithium battery), a biasing member 33 (for example, a cushion rubber) for biasing the light emitting diode 31 to the side protruding in the axial direction from the nut A11, and one end protruding from the nut A11 toward the disc spring 13 and the other end. Has a push-up pin 34 that comes into contact with the battery 32. When the nut assembly 10 is tightened into the nut 16 and the disc spring 13 deforms and hits the push-up pin 34, the battery 32 is pushed up further when the push-up pin 34 is further pushed up, and the upward movement of the battery 32 is restrained. The light-emitting diode 31 is turned on by being touched by the light-emitting diode 31 in the state of being pressed. When the upward movement of the light emitting diode 31 is not restricted, the urging member 3
3, the light emitting diode 31 moves upward by a small amount,
Lighting of the light emitting diode 31 is extinguished because the contact with the battery 32 is cut off.

By changing the length of the push-up pin 34 protruding from the nut A11 toward the disc spring 13, the lighting timings of the two sets of lighting devices 30 with respect to the deformation of the disc spring 13 are different from each other. One set of the lighting devices 30 of the two sets of lighting devices 30 applies a spanner to the hexagonal portion 14 of the nut A11 and turns the nut A11 to tighten the nut A11. 4
The protruding length of the push-up pin 34 from the nut A11 is set so as to start lighting when the pressure reaches 5 kg-m), and the lighting color is blue. The other set of lighting devices 30 of the two sets of lighting devices 30 further tightens the nut A11 to further deform the disc spring 13 so that the upper limit of the appropriate axial force range (for example, 55 kg-m in tightening torque). The protruding length of the push-up pin 34 from the nut A11 is set so as to start lighting when it becomes, and the lighting color is red. Therefore, when the nut A11 is tightened, if the specified axial force (appropriate axial force) has not been reached, it is colorless (does not light), and if it is within the specified axial force range, only the blue light is turned on, and the indicated axial force is exceeded. In that case, both red and blue light up. And when blue light is on, loosen a little (nut A
(Turn slightly in the opposite direction) to turn on only red. Thereby, the tightening by the nut is set to an appropriate axial force range (for example, 45 kg-m or more and less than 55 kg-m).

Lighting holding / releasing device 4 for axial force display device 20
0 is the main body A41, the main body B42, and the cushion 43
, A stopper bolt 44, a stopper pin 45,
Rotating spring 46 and holding pin 47 (FIGS. 5 and 7)
And The lighting holding / releasing device 40 further includes a biasing spring 48 of a stopper pin 45 and a transparent plate 49.
And a bolt 50. The main body A41 has an M groove 51,
An L groove 52 is formed. Counterbore 53 on transparent plate 49
Are formed.

The stopper bolt 44 penetrates the transparent plate 49 and the radial center of the main body A41 in the axial direction, and the screw portion at the tip of the stopper bolt 44 is screwed into the bolt 16. The main body A41 is attached to the hub bolt 16 by the stopper bolt 44. The main body B42, together with the transparent plate 49, is axially movable and rotatable with respect to the main body A41.
It is movable in the axial direction with respect to the nut A11 within the range of the distance regulated by 4, and when the cushion 43 is compressed, the cushion 43 is urged away from the nut A11. The main body B42 pushes the lighting device 30 only when it is pushed to the nut A41 side and is in the lighting device pushing position (when in the state of FIG. 5), and the pressing to the nut A11 side is released, and the main body B42 rises from the lighting device pushing position. When the lighting device 30 is in the lighting device pressing release position (when in the state shown in FIG. 7), the cushion 43 is moved in a direction away from the lighting device 30, and the pressing of the lighting device 30 is released.

As shown in FIGS. 5 and 7, an M-shaped groove 51 extending in the circumferential direction is formed in the main body A41.
An L groove 52 is connected to one end in the circumferential direction. L groove 52
Is located farther from the nut A11 than the M groove 51 by the width of the M groove 51. The stopper pin 45 is provided in the direction of the main body B42 toward the main body A41 and in the radial direction of the main body B.
8 is spring-biased. Rotating spring 46
The main body B42 is returned to the normal position when the main body B42 rotates from the normal position with respect to the main body A41.
Is urged to rotate. The holding pin 47 is slidably mounted on the main body B42 in the axial direction, and presses the lighting device 30 when pressed by the main body B.

Next, the operation and effect will be described. In the nut assembly 10 of the present invention, as shown in FIGS. 1 and 2, the nut B <b> 12 does not rotate or hardly rotates with respect to the nut seat 17, and is only pressed against the nut seat 17 in the axial direction. Therefore, the surface of the nut B12 and the nut seating surface 17 do not suffer from rough surface due to rotational sliding, the axial force accuracy is not affected by the rough surface, and it is possible to manage the axial force with higher accuracy than before. it can. Further, it is not necessary to tighten the bolt with a torque larger than the designated torque, so that the bolt can be prevented from being broken due to excessive tightening.

The nut assembly with the axial force display device according to the present invention includes the axial force display device 20, and the axial force display device has the lighting device 30, so that the deformation amount of the disc spring 13 is within an appropriate range. Can be detected and confirmed that the axial force is in the appropriate range. Further, since the axial force display device 20 includes the lighting holding / releasing device 40, the lighting holding / releasing device 40 releases the lighting of the lighting device 30 after confirming that the axial force is at an appropriate level. The life of the 30 batteries 32 can be extended.

In the nut assembly with an axial force display device according to the present invention, two sets of lighting devices 30 of the axial force display device 20 are provided, and the lighting timing of the two sets of lighting devices 30 is determined by the degree of deformation of the disc spring 13. So that one set of lighting devices 30 is turned on when the axial force reaches the appropriate axial force, and the other set of lighting devices 30 is turned on when the axial force exceeds the appropriate axial force. By setting the timing, (a) the two sets of lighting devices 30 do not reach the designated axial force without lighting, and (b) the lighting of only one set of lighting devices 30 is within the appropriate axial force range. (C) By lighting the two sets of lighting devices 30, it is possible to know that there is an excessive axial force.

In the nut assembly with an axial force display device according to the present invention, as shown in FIGS.
Of the main body A41 and the main body B4
2, an M groove 51, an L groove 52, a stopper pin 45,
Since it has the rotation spring 46 and the holding pin 47, it operates as follows. At the time of initial tightening, the axial force display device 20 is mounted on the nut assembly, and the body B4
Press 2 to make the cushion 43 compressed,
Insert the stopper pin 45 into the M groove 51 to lock the main body B42 of the lighting holding / releasing device 40 at the lighting device pressing position,
In this state, tighten the nut A11 by applying torque.
A proper axial force can be set by tightening until the two sets of lighting devices 30 are turned on, and then slightly turning the nut A11 to the opposite side so that only one set of lighting devices 30 is turned on.

Next, by turning the main body B42 with respect to the main body A41 and inserting the stopper pin 45 into the L groove 52, the main body B42 and the holding pin 45 move in a direction away from the lighting device 30, so that the main body B42 pushes the lighting device. It moves to the release position, and the lighting device 30 goes out. As a result, the lighting device 30 does not stay lit during use, and the battery 3
2 is prevented. When confirming that the axial force is maintained in the proper range during use, push the main body B42, insert the stopper pin 45 into the M groove 51, and set the main body B42 of the lighting holding / releasing device 40 to the lighting device pushing position, What is necessary is just to confirm that only one lighting device 30 is lit. After the confirmation, the main body B42 is again rotated with respect to the main body A41, the stopper pin 45 is inserted into the L groove 52, the main body B42 is moved to the lighting device pressing release position, and the lighting device 30 is turned off.

[0019]

According to the nut assembly of the first aspect, the nut B does not rotate or hardly rotates with respect to the nut seat surface, and is merely pressed in the axial direction against the nut seat surface. The nut seat surface does not suffer from rough surface due to rotational sliding, the axial force accuracy is not affected by the rough surface, and the axial force management can be performed with higher accuracy than before. Therefore, it is not necessary to tighten with a torque larger than the designated torque, and it is possible to prevent the bolt from being broken due to excessive tightening. According to the nut assembly with the axial force display device of the second aspect, since the axial force display device is provided and the axial force display device has the lighting device, the lighting device is illuminated within a proper deformation range of the disc spring. By doing so, it can be detected and confirmed that the axial force is within the appropriate range. In addition, since the axial force display device has the lighting holding / releasing device, the lighting device is released from lighting after confirming that the axial force is at an appropriate level, thereby extending the life of the battery of the lighting device. According to the nut assembly with the axial force display device of claim 3, two sets of lighting devices of the axial force display device are provided, and the lighting timings of the two sets of lighting devices are different from each other with respect to the degree of deformation of the disc spring. Since it is different, one set of lighting devices is turned on when the appropriate axial force is reached,
By setting the lighting timing so that other sets of lighting devices are turned on when the appropriate axial force is exceeded, the specified axial force is not reached without lighting, and the lighting of only one set of lighting devices is By lighting the two sets of lighting devices in the power range, it is possible to know that there is an excessive axial force. According to the nut assembly with the axial force display device of claim 4,
Since the lighting holding / releasing device of the axial force display device has the main body A, the main body B, the M groove and the L groove, the stopper pin, the rotation spring, and the holding pin, the stopper pin is formed into the M groove and the L groove. By setting the proper axial force at the time of initial tightening, preventing battery consumption due to turning off the lighting device, and confirming that the axial force during use is maintained within the appropriate range. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view of a nut assembly according to an embodiment of the present invention.

FIG. 2 is a plan view of the nut assembly of FIG.

FIG. 3 is a sectional view of a lighting holding / releasing device of the axial force display device of the nut assembly with the axial force display device according to the embodiment of the present invention.

FIG. 4 is a plan view of the device of FIG. 3;

FIG. 5 is a cross-sectional view of the nut assembly with an axial force display device according to the embodiment of the present invention at the time of lighting.

FIG. 6 is a plan view of FIG. 5;

FIG. 7 is a cross-sectional view of the nut assembly with the axial force display device according to the embodiment of the present invention when the light is turned off.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Nut assembly 11 Nut A 12 Nut B 13 Disc spring 14 Hexagon external part 15 Screw part 16 Bolt 16 (for example, hub bolt) 17 Nut seat surface 18 Wheel disc 19 Tip part of nut A 20 Axial force display device 30 Lighting device 31 Light emitting diode 32 Battery 33 Biasing member 34 Push-up pin 40 Lighting holding / releasing device 41 Main body A 42 Main body B 43 Cushion 44 Stopper bolt 45 Stopper pin 46 Rotating spring 47 Pressing pin 48 Pressing spring 49 Transparent plate 50 Bolt 51 M groove 52 L groove 53 Counterbore

Claims (4)

[Claims] 1. A nut A to which a tightening torque is applied and which is screwed to a bolt on an inner periphery thereof; and a nut B which is rotatable and axially movable relative to the nut A and is axially pressed against a nut seating surface. When the distance between the spring seats of the nut A and the nut B is reduced by the tightening torque applied to the nut A, the nut A is compressed and deformed.
A disc spring that converts the tightening torque applied to the nut into an axial force and applies the axial force to the nut B. 2. A nut assembly comprising: a nut assembly and an axial force display device, wherein the nut assembly is tightened with a torque, and is screwed to a bolt on an inner periphery thereof; A nut B that can move in the direction and is pressed in the axial direction against the nut seat surface, and is mounted between the nut A and the nut B, and when the tightening torque applied to the nut A reduces the distance between the spring seats of the nut A and the nut B Nut A while compressing and deforming itself
And a disc spring that converts the tightening torque applied to the nut into an axial force and applies the axial force to the nut B. The axial force indicating device is mounted on the nut A so as to be movable in the axial direction with respect to the nut A. A lighting device that lights up when pressed, a cushion rubber disposed on an end surface of the nut A opposite to the nut B, and a main body B mounted on the nut A so as to be movable in the axial direction via the cushion rubber. Including, a lighting holding and releasing device for holding and releasing the lighting of the lighting device,
Nut assembly with axial force display. 3. The lighting device of the axial force display device is provided in two sets, and the lighting timing of the two sets of lighting devices with respect to the deformation of the disc spring is different from each other. A light emitting diode, a battery, a biasing member for biasing the light emitting diode to a side protruding from the nut A, and a push-up pin having one end protruding from the nut A toward the disc spring and the other end contacting the battery. The nut assembly with an axial force display device according to claim 2, wherein 4. A lighting / holding / releasing device of the axial force display device, comprising: a main body A mounted on a hub bolt by a stopper bolt; an axially movable and rotatable main body A with respect to the main body A; Pressing the lighting device only when it is pushed to the A side and in the lighting device pushing position, pressing the lighting device to the nut A side and releasing the lighting device pushing position raised from the lighting device pushing position when released from the lighting device pushing position, the cushion is used for the main body. A body B that is moved in a direction away from the lighting device together with A to release the pushing of the lighting device, an M groove formed in the body A, and a nut A connected to the M groove and connected to the M groove. An L-groove located at a distance, a stopper pin spring-biased in a radial direction from the main body B in the direction of the main body A, and A rotary spring which biases pivoting relative to the body A body B in Suyo, is mounted on the main body B, and the pressing pin presses the lighting device, the axial force display device nut assembly of claim 2 wherein comprising a.