JP2004028701A - Tire testing machine and drum device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drum device for a tire testing machine which can precisely measure uniformity in a high-speed rotation level by increasing a natural frequency of the drum device when a rotating drum presses against a tire. <P>SOLUTION: The drum device for a tire testing machine comprises a movable frame 26 which is slidably provided over a base 10 of a main frame 2, a rotating drum 6 which is provided on the movable frame 26 such that the rotating drum 6 can rotate around a shaft standing vertically, and a moving mechanism 28 which moves the rotating drum 6 to a tire installed on a spindle device 3 provided in the main frame 2. The drum device further comprises a chuck mechanism 44 which presses the movable frame 26 against a sliding surface of the base 10 to fix the movable frame 26 and the the base 10. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tire testing machine and a drum device used for the same.
[0002]
[Prior art]
A tire tester for measuring tire uniformity (static and dynamic uniformity of tire characteristics on the circumference) generally includes a spindle device that holds a tire rotatably around a vertical axis and a spindle device. And a drum device for pressing a rotary drum against the outer peripheral surface of a tire mounted on the upper and lower rims of the tire.
A drum device of such a tire testing machine includes a movable frame provided slidably with respect to a base of a main frame, and a rotating drum attached to the movable frame so as to be rotatable around a vertical axis. An advancing / retreating mechanism for advancing / retreating the rotary drum toward / from a tire mounted on a spindle device provided in the main frame (for example, see FIGS. 1 and 2 of JP-A-11-223571). .
[0003]
[Problems to be solved by the invention]
In the above-mentioned conventional drum device, the movable frame is merely provided so as to be slidable with respect to the base of the main frame. The stiffness when pressed against was relatively low.
For this reason, in the conventional drum device, its natural frequency cannot be increased so much, and when the tire is rotated at high speed, it resonates with the frequency of measurement, and uniformity measurement can be performed accurately. Did not.
[0004]
The present invention has been made in view of the above-described circumstances, and a tire test capable of accurately measuring uniformity in a high-speed rotation range by improving a natural frequency of a drum device when a rotating drum is pressed against a tire. And a drum device used for the same.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has taken the following technical measures.
That is, the present invention provides a movable frame slidably provided with respect to a base of a main frame, a rotating drum attached to the movable frame so as to be rotatable around a vertical axis, and An advancing and retreating mechanism for advancing and retreating the rotary drum toward a tire mounted on a spindle device provided in a frame, a drum device of a tire testing machine, wherein the movable frame is mounted on a sliding surface of the base. It is characterized in that a chuck mechanism for pressing and fixing both is provided.
[0006]
According to the present invention, since the chuck mechanism presses the movable frame against the sliding surface of the base to fix them, the natural frequency of the drum device when the rotating drum is pressed against the tire is greatly increased. The uniformity of the tire can be accurately measured even when the tire is rotated at a speed higher than normal (60 rpm).
In the present invention, the chuck mechanism is, more specifically, a fluid pressure cylinder fixed to a movable frame and a fluid pressure cylinder supplied to the cylinder so that the chuck mechanism can be freely moved toward and away from a base by the fluid pressure supplied to the cylinder. And a pressing piston inserted therethrough.
[0007]
Further, the present invention provides a main frame, a spindle device for rotatably holding a tire around a vertical axis in the frame, and a rotating drum on an outer peripheral surface of a tire mounted on upper and lower rims of the spindle device. A tire testing machine comprising: a drum device for pressing; and a conveyor device for loading a tire into a main frame and setting it on a spindle device, wherein the drum device having the chuck mechanism is employed as the drum device, A drive motor for driving the tire is provided on the drum device, and a load sensor for measuring tire uniformity is provided on the spindle device.
[0008]
In this case, the rotating drum of the drum device is on the driving side, and the tire mounted on the spindle device is on the driven side, and the uniformity of the tire is directly measured on the driven spindle device. Does not affect the measurement value of the load sensor, and the uniformity of the tire at the time of high-speed rotation can be measured more accurately.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
3 and 4 show the overall structure of a tire testing machine 1 employing the present invention.
The tire testing machine 1 is mounted on a main frame 2, a spindle device 3 for holding a tire rotatably around a vertical axis in the frame 2, and upper and lower rims 4, 5 of the spindle device 3. It mainly comprises a drum device 7 for pressing the rotary drum 6 against the outer peripheral surface of a tire (not shown), and a conveyor device 8 for carrying the tire into the main frame 2 and setting it on the spindle device 3.
[0010]
The main frame 2 includes a base 10 formed of a substantially rectangular hollow frame, a pair of right and left columns 11, 11 erected on both left and right sides (left and right sides in FIG. 3) of the base 10. An upper beam 12 is provided between the upper ends of the columns 11, 11, and a top plate 13 protrudes in a cantilever manner from the center of the upper beam 12 forward (to the left in FIG. 4). .
The spindle device 3 is disposed in the main frame 2 at the center in the left-right direction (left-right direction in FIG. 3) and at the front side in the front-rear direction (left-right direction in FIG. 4). The spindle device 3 is attached to the base 10 so as to be rotatable about a vertical axis, and has a lower rim 5 at an upper end thereof. It comprises a cylindrical shaft 15 arranged coaxially and having an upper rim 4 at a lower end, and an elevating mechanism 16 for vertically moving the cylindrical shaft 15 up and down to attach to and detach from the main shaft 14.
[0011]
The elevating mechanism 16 includes an upper elevating cylinder 17 erected on the top plate 13 of the main frame 2, and an elevating rod inserted through the cylinder 17 so as to be vertically movable from the lower end of the cylinder 17. And a lifting member 19 attached to the lower end of the lifting rod 18. The lifting member 19 is provided with a movable hook 21 which is engaged with and disengaged from an engagement groove 20 formed on the outer peripheral surface of the cylindrical shaft 15, and moves the lifting rod 18 up and down while gripping the cylindrical shaft 15 with the movable hook 21. Thus, the cylindrical shaft 15 can be inserted into and removed from the upper end of the main shaft 14.
[0012]
The conveyor device 8 is disposed in the main frame 3 at a position substantially overlapping with the spindle device 3. The conveyor device 8 includes a pair of front and rear belt conveyors 22, 22 disposed so as to sandwich the main shaft 14 of the spindle device 3 from front and rear, and a transport motor 24 that drives a driving pulley 23 of each of the conveyors 22, 22. A lower elevating cylinder 25 for raising and lowering each of the conveyors 22 at the same time.
The lower lifting cylinder 25 moves between a lowermost position where the conveyor 22 is substantially close to the upper surface of the base 10 (the state in FIG. 1) and an uppermost position where the conveyor 22 is slightly higher than the upper end of the main shaft 14 of the spindle device 3. The stroke amount is set so that the user can move back and forth.
[0013]
The drum device 7 is disposed at the center in the left-right direction in the main frame 2 and at the rear side in the front-rear direction (left-right direction in FIG. 4). The drum device 7 is attached to the movable frame 26 slidably in the front-rear direction with respect to the base 10 of the main frame 2 and to the movable frame 26 so as to be rotatable around the vertical axis. The rotating drum 6 includes an advancing / retreating mechanism 28 that advances and retreats the rotating drum 6 toward and from a tire mounted on the spindle device 3 provided in the main frame 2.
[0014]
In the tire testing machine 1 according to the present embodiment, the tire is rotated by the driving force of the rotating drum 6 in order to minimize the influence of the measured value due to the centrifugal force of the tire and to accurately measure the uniformity of the tire during high-speed rotation. The load is measured in the spindle device 3 on the driven side. For this reason, a drum motor 29 for driving the rotary drum 6 is provided under the movable frame 26 of the drum device 7 in a suspended manner, and a load composed of a triaxial load cell or the like for measuring the uniformity of the tire is provided. A sensor 30 is provided on the main shaft 14 of the spindle device 3.
[0015]
As shown in FIGS. 1 and 2, the base 10 of the main frame 2 is fixed to a base plate 33 having a guide slit 32 that is long in the front-rear direction (the left-right direction in FIG. 2), and both right and left ends of the plate 33. And a side plate 34. A pair of left and right guide rails 35, 35 each having a groove opening toward the center are extended in the front-rear direction at the edge of the upper surface of the base plate 33 on the guide slit 32 side.
The movable frame 26 of the drum device 7 includes a slide plate 36 whose left and right side edges are slidably fitted in opposed grooves of the guide rails 32, respectively, and an upper frame 37 erected on the upper surface of the slide plate 36. And a lower frame 38 fixed to the lower surface of the slide plate 36 so as to extend below the base plate 33 through the guide slit 32.
[0016]
Among these, the upper frame 37 is formed in a substantially U-shape in a side view having a storage portion that opens forward, and the rotating drum 6 is stored in the storage portion. Bearing portions 39, 39 are attached to the upper and lower portions of the upper frame 37, and upper and lower shaft portions passing through the center of the rotary drum 6 are rotatably inserted into the bearing portions 39, 39. The drum motor 29 is fixed to the lower surface of the bottom plate 40 of the lower frame 38 in a suspended manner. The output shaft of the motor 29 is connected to the lower shaft portion 6a of the rotary drum 6 via a coupler 41 (see FIG. 1). It is connected to the.
[0017]
As shown in FIG. 2, the advancing / retracting mechanism 28 of the drum device 7 includes a screw shaft 42 extending rearward from the rear end of the upper frame 37 of the movable frame 26, and an advancing / retracting motor for rotating the screw shaft 42 in a forward / reverse rotation. The motor 43 is attached to a rear frame 44 erected at the rear end of the base plate 33. Incidentally, the advance / retreat mechanism 28 may be constituted by a pneumatic cylinder or other actuator.
The drum device 7 of the present embodiment also includes a chuck mechanism 45 for pressing the movable frame 26 against the sliding surface of the base 10 to fix the two 10, 26. The chuck mechanism 45 includes a plurality of (four in the illustrated example) hydraulic cylinders 46 provided below the base plate 33 in the movable frame 26, and hydraulic fluid supplied to each of the cylinders 46. A pressure piston 47 is inserted into the cylinder 46 so as to be able to freely contact and separate from the lower surface.
[0018]
In the present embodiment, a total of four hydraulic cylinders 46 are provided on the left and right measurement walls of the lower frame 38 so as to be separated from each other in the front and rear directions. Installed facing. Therefore, after the movable frame 26 is set at a predetermined position, the pressing pistons 47 of the respective hydraulic cylinders 46 are made to protrude and come into contact with the lower surface of the base plate 36, so that the distance between the slide plate 36 and the guide rail 35 is reduced. The rattling can be eliminated.
[0019]
Next, the method of use and operation of the tire testing machine 1 having the above configuration will be described.
First, in order to measure the uniformity of a tire using the tire testing machine 1 of the present embodiment, the lifting member 19 of the lifting mechanism 16 is raised, the cylindrical shaft 15 is pulled out from the main shaft 14, and in this state, the uppermost position is reached. The tire is carried into the main frame 2 by the belt conveyor 22 and centered. The conveyor 22 is lowered to the lowermost position, and the tire is set on the lower rim 5 of the main shaft 14.
Thereafter, the lifting member 19 of the elevating mechanism 16 is lowered to fit the cylindrical shaft 15 into the upper half of the main shaft 14, and when the upper and lower rims 4, 5 are joined, the two shafts 14, 15 are locked, and the elevating mechanism 16 is lifted. The member 19 is raised again, and the movable frame 26 of the drum device 7 is moved forward to press the rotating drum 6 against the tire with a predetermined load, and the chuck mechanism 45 is operated to lock the movable frame 26 to the base 10.
[0020]
Then, the drum motor 29 of the drum device 7 is operated to rotate the tire at a high speed, and the uniformity of the tire is measured in this state. After the measurement is completed, the measured tire can be carried out of the machine by operating each device in the reverse manner as described above.
At this time, according to the tire testing machine 1 of the present embodiment, since the chuck mechanism 45 presses the movable frame 26 against the sliding surface of the base 10 to fix them, the rotary drum 6 is pressed against the tire. In this case, the natural frequency of the drum device 7 is greatly improved, and the uniformity of the tire can be accurately measured even when the tire is rotated at a speed higher than normal (60 rpm).
[0021]
Further, in the present embodiment, the rotating drum 6 of the drum device 7 is on the driving side, and the tire mounted on the spindle device 3 is on the driven side, and the driven spindle device 3 directly measures the uniformity of the tire. Therefore, the centrifugal force of the tire does not affect the measurement value of the load sensor, and in this regard, the uniformity of the tire at the time of high-speed rotation can be accurately measured.
Note that the present invention is not limited to the above embodiment, and the movable frame 26 may be relatively pressed against the sliding surface of the base 10 to fix them. For example, a hydraulic cylinder 46 constituting the chuck mechanism 45 may be provided on the base 10 side.
[0022]
Further, as the chuck mechanism 45, a fluid pressure cylinder such as an air cylinder or a mechanical pressure bonding mechanism other than the fluid pressure cylinder can be adopted.
[0023]
【The invention's effect】
As described above, according to the present invention, the natural frequency of the drum device when the rotating drum is pressed against the tire is improved, so that the uniformity can be accurately measured in a high-speed rotation range.
[Brief description of the drawings]
FIG. 1 is a front view of a drum device.
FIG. 2 is a side view of the drum device.
FIG. 3 is a front view of the tire testing machine.
FIG. 4 is a side view of the tire testing machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tire testing machine 2 Main frame 3 Spindle device 4 Upper rim 5 Lower rim 6 Rotary drum 7 Drum device 8 Conveyor device 10 Base 26 Movable frame 28 Advance / retreat mechanism 29 Drum motor (drive motor)
30 load sensor 45 chuck mechanism 46 hydraulic cylinder (fluid pressure cylinder)
47 Pressing piston

Claims (3)

A movable frame slidably provided with respect to a base of the main frame, a rotating drum attached to the movable frame so as to be rotatable around a vertical axis, and provided in the main frame. An advancing and retreating mechanism for advancing and retreating the rotary drum toward a tire mounted on a spindle device, a drum device of a tire testing machine comprising:
A drum device for a tire testing machine, comprising: a chuck mechanism for pressing the movable frame against a sliding surface of the base to fix the two members. The chuck mechanism comprises a fluid pressure cylinder fixed to the movable frame, and a piston inserted into the cylinder so as to be able to freely contact and separate from the base by the fluid pressure supplied to the cylinder. Item 2. A drum device for a tire testing machine according to item 1. A main frame, a spindle device for rotatably holding the tire around the vertical axis in the frame, a drum device for pressing a rotating drum against an outer peripheral surface of a tire mounted on the upper and lower rims of the spindle device, and a tire. And a conveyor device for loading the main frame into the main frame and setting the spindle device on the spindle device.
The drum device comprises the drum device according to claim 1, wherein a drive motor for driving a rotary drum is provided in the drum device, and a load sensor for measuring tire uniformity is provided in the spindle device. A tire testing machine, which is provided.

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