JP4386533B2 - Dual wheel diameter difference measuring device and double wheel diameter difference measuring method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multiple wheel diameter difference measuring apparatus that easily measures a diameter difference between multiple wheels in a mounted state where two or more tires are mounted on one side.
[0002]
[Prior art]
In tires for trucks and buses, construction vehicles, and industrial vehicles, it is common to mount a plurality of tires that are supported by two or more tires on one side with respect to a drive shaft or a shaft with a large load or wear.
[0003]
In addition, when a tire breaks down or reaches the wear limit (hereinafter referred to as complete wear), it is extremely rare to replace tires with multiple wheels all together, and only the tires are new. Replace with a new tire. Therefore, a new tire and a tire in use (hereinafter referred to as an old product) are used together.
[0004]
[Problems to be solved by the invention]
In tire standards (1999 version) such as JATMA, for example, in the 10.00R20 size, the static load radius tolerance is ± 9 mm, the minimum outer dimension when new is 1037 mm, and the maximum outer dimension when growing is 1078 mm. The difference is 41 mm. Accordingly, when old and new tires are used simultaneously in a multi-wheel, a large radius difference (diameter difference, hereinafter may be referred to as a level difference) occurs in the multi-wheel combination having a large external dimension difference as described above. Further, when there is a difference in wear level between the tires of two or more wheels or when there is a difference in air pressure between the two or more wheels, the level difference is further increased. Furthermore, there is a possibility that the level difference further increases when the tire types (for example, tread patterns) are different.
[0005]
When the outer diameter difference between the multiple wheels is increasing as described above, the load and driving force are concentrated on the tire having the larger outer diameter dimension of the tire, and the tire having the smaller tire outer diameter dimension is also applied. Since the tire wear life is shortened while being dragged, there is a problem that failure or complete wear occurs at an early stage.
[0006]
Also, in recent years, flattening of tires of 70 series and below and even 60 series and below is spreading due to the demand for lower floor and lighter truck and bus vehicles, and the road index for tire size (air capacity). (Index indicating the maximum mass allowed to be loaded on the tire under specified conditions) may be set higher, and the above-described problem is more likely to occur.
[0007]
In order to solve the above problems, it is important to measure the level difference between the two-wheeled tires, but at present, the level difference between the two-wheeled tires is hardly measured and is slightly confirmed by visual observation. Only.
[0008]
In view of the above-described facts, an object of the present invention is to provide a multiple wheel diameter difference measuring device that easily measures a step between mounted tires.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 is a pair of installation members that are placed on tread surfaces of different wheels mounted on the multiple wheels , wherein at least one of the installation members is movable in the axle direction, a pair of installation members the inner peripheral surface comes into contact with the wall surface of the circumferential groove of the tire is supported on the installation member, characterized in that it comprises a measuring means for detecting a level difference between a plurality of wheels, a.
[0010]
The operation of the dual wheel diameter difference measuring apparatus according to claim 1 will be described.
[0011]
An installation member is mounted on the tread surface of the wheel with respect to the plurality of wheels mounted on the multiple wheels, and a step between the plurality of wheels is detected by a measuring unit supported by the installation member . In this way, it is possible to easily and accurately detect the diameter difference between the wheels with the double wheels mounted.
[0012]
Further, for the Fukuwa mounted after mounting the wheel tread in one of the mounting member, by placing the other installation member to different wheel tread, Fukuwa diameter difference measured on the wheel Install the device stably. At this time, even when the number, size, and type of tires mounted on the multiple wheels are different, one installation member can move in the axle direction, so that it can be reliably placed on the tread of the wheel.
[0013]
The invention according to claim 2 is the dual wheel diameter difference measuring device according to claim 1 , wherein the measuring means is movable to the measurement position of each wheel and based on the dimension from the reference position to the tread surface. And measuring a step between a plurality of wheels.
[0014]
The operation of the dual wheel diameter difference measuring apparatus according to claim 2 will be described.
[0015]
Since the measuring means can be moved to the measurement position of each wheel, the dimension from the tread surface of each wheel mounted on the double wheel to the reference position can be measured easily and accurately.
[0016]
According to a third aspect of the present invention, in the first or second aspect of the invention, the measuring means guides the measuring member for measuring the dimension from the reference position to the tread surface, and the measuring member to the measuring position of each wheel. And the measuring member slides on the supporting member and moves.
[0017]
The operation of the dual wheel diameter difference measuring apparatus according to claim 3 will be described.
[0018]
After installing the dual wheel diameter difference measuring device on the tread surface for a tire with multiple wheels mounted, the measurement member slides on the support member to move to the measurement position of each wheel, and the reference position of each wheel Measure from the tread surface to the tread surface. Therefore, the diameter difference between the wheels can be detected easily and accurately in a state where the multiple wheels are mounted.
[0019]
According to a fourth aspect of the present invention, in the third aspect of the present invention, the measurement unit includes a horizontal adjustment unit that adjusts the support member horizontally.
[0020]
The operation of the dual wheel diameter difference measuring apparatus according to claim 4 will be described.
[0021]
If the support member is adjusted horizontally, the measurement member that slides on the support member can be moved in the axle direction. As a result, the measurement value of the measurement member becomes a measurement value from the reference position of the same height, and can be used without correcting the measurement value. Therefore, the measurement work is made efficient.
[0022]
According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the measuring means includes a display unit that displays a step between the wheels.
[0023]
The operation of the dual wheel diameter difference measuring device according to claim 5 will be described.
[0024]
If the measured value (diameter difference) is directly displayed on the display unit, it is not necessary to display the step by calculating from the measured value, and the measurement work is made efficient.
[0025]
The invention according to claim 6 is a first step of placing a pair of installation members on the tread surfaces of two wheels mounted with multiple wheels, with each inner peripheral surface abutting against the wall surface of the circumferential groove of the tire. And a second step of leveling the support member supported by the installation member, and a measurement member provided on the leveled support member is moved in the axle direction to set the support member or the measurement member. And a third step of measuring the dimension from the reference position thus made to the tread surface of each wheel.
[0026]
The operation of the dual wheel diameter difference measuring method according to claim 6 will be described.
[0027]
A pair of installation members are placed on the tread surface of the wheel with respect to the tire mounted with multiple wheels, and the support members supported by the installation members are leveled. In this state, the measurement member provided on the support member is moved to the measurement position. Subsequently, the dimension from the reference position set to the support member or the measurement member to the tread surface is measured for each tire. This difference in dimensions becomes the step of each wheel, that is, the diameter difference. As described above, the diameter difference between the wheels can be easily detected in a state where the multiple wheels are mounted.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Next, a dual wheel diameter difference measuring apparatus according to an embodiment of the present invention will be described.
[0029]
As shown in FIGS. 1 and 2, in the dual wheel diameter difference measuring device 10, two shafts 16 and 18 are supported in parallel on a pair of bases 12 and 14. A movable table 20 through which shafts 16 and 18 are inserted is supported between the pair of bases 12 and 14. The movable base 20 is movable along the shafts 16 and 18 and is locked to the shafts 16 and 18 by locking bolts 22 provided at both ends.
[0030]
Base portions 30 and 32 are respectively provided on the upper portions of the bases 12 and 14, and two shafts 34 and 36 are disposed in parallel between the base portions 30 and 32. A measuring table 38 through which shafts 34 and 36 are inserted is supported between the pair of base portions 30 and 32, and is movable along the shafts 34 and 36.
[0031]
On the measurement table 38, a support portion 44 that rotatably supports a caliper 42 via a pin member 40 is provided. Therefore, the inclination angle of the caliper 42 with respect to the measurement table 38 can be changed.
[0032]
The caliper 42 includes a housing-shaped caliper main body 46, a measuring member 48 that slides inside the caliper main body 46, a dial 50 that adjusts the amount of displacement of the measuring member 48, and a display unit that digitally displays the measurement result. 52.
[0033]
One end of the measurement member 48 is provided with a rectangular contact portion 54 that contacts the tread surface of the tire, and a stopper 55 is provided at the other end. The measuring member 48 is locked to the caliper body 46 by a locking screw 57.
[0034]
The display unit 52 detects the amount of movement (height) of the measuring member 48 from the amount of rotation of the dial 50 and displays it. A power button 56 and a zero set button 58 used at the time of measurement are provided beside the display unit 52. These usage methods will be described later.
[0035]
By the way, the base 12 and the base 30 are connected as follows. That is, as shown in FIG. 3, the arm 60 is erected on the outside of the base 12. As shown in FIGS. 1 and 2, the arm 60 has a pin member 64 supported by a pair of leg portions 62 of the base portion 30 inserted therein, and supports the base portion 30 so as to be rotatable about the pin member 64. Yes.
[0036]
On the other hand, the base 14 and the base 32 are connected as follows. That is, as shown in FIGS. 3 and 4, a support base 68 having a pair of leg portions 66 is provided outside the base 14. As shown in FIG. 4, a pin member 70 is disposed between the leg portions 66, and supports an adjustment shaft 72 formed with a thread groove so as to be rotatable about the pin member 70. The adjustment shaft 72 is inserted into a hole 73 formed in the base 32, and a stopper 75 for preventing the base 32 from being detached is attached to the upper end. Further, a dial 74 is screwed onto the adjustment shaft 72 below the base portion 32, and a disk-like contact portion 76 of the dial 74 contacts and supports the base portion 32 from below. Therefore, by rotating the dial 74, the base portion 32 moves up and down along the adjustment shaft 72 according to the dial 74. At this time, when the base portion 32 moves up and down, the base portion 30 rotates about the pin member 64, and the inclination angle of the shafts 34 and 36 changes. In this case, the adjustment shaft 72 is also rotated around the pin member 70 following the inclination of the base portion 32, and the base portion 32 can also be inclined along the shafts 34 and 36.
[0037]
A level 80 is provided on the base 32 so that the level of the shafts 34 and 36 can be measured. Further, a lock member 82 is provided on the base 32, and rotates around a knob screw 84 screwed to the base 32, and an engaging portion 86 having an arcuate surface is formed as an adjustment shaft. The base 32 is prevented from oscillating (moving up and down) along the adjustment shaft 72 when the product is transported by being brought into contact with 72 and fixed with a screw 84 with a knob.
[0038]
The measuring method and operation of the thus configured double wheel diameter difference measuring apparatus 10 will be described. In the present embodiment, a case will be described in which the diameter difference between two tires is measured by the multiple wheel diameter difference measuring device 10.
[0039]
First, the base 12 side of the dual-wheel diameter difference measuring device 10 is inserted from the side of the vehicle toward the inner tire 100 mounted with multiple wheels, and the base 12 is installed on the tread 102 of the tire 100 (FIG. 5). reference). In this case, it is necessary to install the base 12 inside the equator plane CL of the tire 100. This is for measuring the vicinity of the equatorial plane CL when measuring the step of the tread described later.
[0040]
Next, the locking bolt 22 is loosened, the movable base 20 is moved along the shafts 16 and 18, and is placed on the tread 106 of the outer tire 104, and is locked to the shafts 16 and 18 by the locking bolt 22. To do. In this case, the movable table 20 needs to be installed outside the equator plane CL of the tire 104. The reason is the same as described above.
[0041]
At this time, the inner surfaces 12 </ b> A and 20 </ b> A of the base 12 and the movable base 20 are brought into contact with the wall surfaces of the circumferential grooves 107 and 108 of the tires 100 and 104. Thereby, the shafts 16 and 18 of the multiple wheel diameter difference measuring apparatus 10 and shafts 34 and 36 described later are reliably arranged in a direction orthogonal to the tire circumferential direction.
[0042]
In addition, when the movable base 20 moves along the shafts 16 and 18, the base 12 and the movable base 20 can be installed at predetermined positions even when the tire sizes are different or when there are three or more wheels. That is, by moving the movable base 20 along the shafts 16 and 18, the multiple wheel diameter difference measuring device 10 can be installed for various multiple wheels.
[0043]
Subsequently, the dial 74 disposed at the lower portion of the base portion 32 is rotated to adjust the shafts 34 and 36 to be horizontal. That is, when the dial 74 is rotated, the base portion 32 supported by the contact portion 76 moves up and down. In this embodiment, the base portion 32 is raised, and the rotation of the dial 74 is stopped when the bubble of the level 80 provided on the base portion 32 is in the middle (showing horizontal). By the vertical movement of the base portion 32, the base portion 30 rotates about the pin member 64, and the shafts 34 and 36 are inclined with respect to the shafts 16 and 18 together with the base portion 30. At the same time, the adjustment shaft 72 rotates around the pin member 70, and the base portion 32 is inclined with respect to the shafts 16 and 18 along the shafts 34 and 36.
[0044]
As a result, as shown in FIG. 6, the shafts 34 and 36 are in a horizontal state. In this state, the vernier caliper 42 is moved along the shafts 34 and 36 to be positioned on the equator plane CL of the tire 100. In this state, the caliper body 46 is rotated around the pin member 40, and the caliper body 46 is made vertical. That is, the caliper body 46 is made vertical by the back surface 46 </ b> A of the caliper body 46 coming into contact with the vertical surface 44 </ b> A of the support portion 44. Here, the dial 50 is rotated and the measuring member 48 is lowered and brought into contact with the tread surface 102. In this state, the power button 56 is turned on, and further, the zero set button 58 is turned on. By this operation, the dial rotation position becomes the reference position, and “0.0” is displayed on the display unit 52. After confirming the display of “0.0” on the display unit 52, the measurer rotates the dial 50 to raise the measuring member 48, or tilts the caliper 42 around the pin member 40 (see FIG. 3, see virtual line part). In this state, the measurement table 38 is moved along the shafts 34 and 36 and moved to the upper part of the equatorial plane CL of the tire 104.
[0045]
Subsequently, the dial 50 is rotated to bring the contact portion 54 of the measurement member 48 into contact with the tread 106 of the tire 104. In this state, the numerical value on the display unit 52 is read. At this time, the display unit 52 displays the level difference between the tread surface 102 and the tread surface 106 based on the rotation amount of the dial 50 from the time of zero setting (reference position). That is, the diameter difference between the tire 100 and the tire 104 is displayed.
[0046]
The inner peripheral surfaces 12A and 20A of the base 12 and the movable base 20 are brought into contact with the wall surfaces of the circumferential grooves 107 and 108 of the tires 100 and 104, whereby the dual wheel diameter difference measuring device 10 (shafts 34 and 36). Are installed on the tire so as to be orthogonal to the tire circumferential direction, the same position in the tire circumferential direction of each tire 100, 104 can be measured by the caliper 42, and the measurement accuracy of the diameter difference of the multiple wheels is improved. be able to.
[0047]
Further, since the rectangular contact portion 54 arranged perpendicular to the measurement member 48 is formed at the tip of the measurement member 48, the contact portion 54 is a groove (mainly formed in the tread surfaces 102 and 106). To prevent measurement accuracy from being lowered.
[0048]
Furthermore, when the road surface 110 is inclined, even if the steps of the tires 100 and 104 are measured, the diameter difference is not accurately measured. Therefore, as shown in FIG. 8, after measuring the diameter difference between the tires 100 and 104, the multiple wheel diameter difference measuring device 10 is used in the road surface 110 in front of the tire in the same manner as measuring the tire step. By measuring the height difference of 110, it is possible to more accurately measure the diameter difference between the tires of the two wheels.
[0049]
In the present embodiment, the case where two wheels are mounted has been described, but the present invention is not limited to two wheels, and can be applied to the case of three or more wheels. In this case, the base 12 and the movable base 20 may be installed inside and outside the equatorial plane of the innermost and outer tires, respectively.
[0050]
In the present embodiment, the inner surfaces 12A and 20A of the base 12 and the movable base 20 are brought into contact with the wall surfaces of the circumferential grooves 107 and 108 of the tires 100 and 104, but are brought into contact with the shoulder portions of the respective tires. May be.
[0051]
【The invention's effect】
As described above, since the dual wheel diameter difference measuring apparatus and method of the present invention have the above-described configuration, it is possible to easily and accurately measure the dual wheel diameter difference.
[Brief description of the drawings]
FIG. 1 is a perspective view of a multiple wheel diameter difference measuring apparatus according to an embodiment of the present invention.
FIG. 2 is a plan view of a multiple wheel diameter difference measuring apparatus according to an embodiment of the present invention.
FIG. 3 is a side view of a multiple wheel diameter difference measuring apparatus according to an embodiment of the present invention.
FIG. 4 is a perspective view of an essential part of a multiple wheel diameter difference measuring apparatus according to an embodiment of the present invention.
FIG. 5 is a schematic front view showing a multiple wheel diameter difference measuring method according to an embodiment of the present invention.
FIG. 6 is a schematic front view showing a multiple wheel diameter difference measuring method according to an embodiment of the present invention.
FIG. 7 is a schematic front view showing a multiple wheel diameter difference measuring method according to an embodiment of the present invention.
FIG. 8 is a schematic front view showing a variation of the multiple wheel diameter difference measuring method according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Dual-wheel diameter difference measuring apparatus 12 Base 16, 18 Shaft 20 Movable stand 34, 36 Shaft 52 Display part 72 Adjustment axis (horizontal adjustment means)
74 dial (leveling means)
76 Contact part

Claims (6)

A pair of installation members mounted on the tread surfaces of different wheels mounted on the multiple wheels , wherein at least one of the installation members is movable in the axle direction, and each inner peripheral surface is a circumferential direction of the tire A pair of installation members that contact the wall surface of the groove ;
Measuring means supported by the installation member and detecting steps between a plurality of wheels ;
A dual wheel diameter difference measuring device comprising: 2. The compound wheel according to claim 1 , wherein the measuring means is movable to a measurement position of each wheel and measures a step between a plurality of wheels based on a dimension from a reference position to a tread surface. Diameter difference measuring device. The measuring means includes a measuring member for measuring a dimension from a reference position to a tread surface;
A support member for guiding the measurement member to a measurement position of each wheel;
The multi-wheel diameter difference measuring device according to claim 1 , wherein the measurement member slides and moves on a support member. 4. The dual wheel diameter difference measuring apparatus according to claim 3 , wherein the measuring means includes a horizontal adjusting means for adjusting the support member horizontally. The multi-wheel diameter difference measuring device according to any one of claims 1 to 4 , wherein the measuring unit includes a display unit that displays a step between the wheels. A first step of placing a pair of installation members on the tread surfaces of two wheels mounted with multiple wheels with each inner circumferential surface abutting against the wall surface of the circumferential groove of the tire ;
A second step of leveling the support member supported by the installation member;
A third step of measuring a dimension from a reference position set to the support member or the measurement member to a tread surface of each wheel by moving a measurement member provided on the leveled support member in an axle direction; ,
A method for measuring a difference in diameter of multiple wheels, comprising:

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