JPH11118655A - Tire chucking apparatus for tire uniformity machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire chucking apparatus which may use small power of a test drive by easily and accurately engaging by centering upper and lower chucking apparatus bodies at each time of inspecting a tire, improving a radial accuracy and alleviating a load to a bearing or the like. SOLUTION: The tire chucking apparatus for a tire uniformity machine comprises upper and lower chucking apparatus bodies 3, 6 mounted at an elevation shaft 1 and a drive shaft 4, a conical engaging recess 11 provided at the body 3, and a conical engaging part 24 provided at the body 6. In this case, the body 6 contains a rim reaction force locking unit 27 for holding rim reaction force by engaging with the body 3. A locking rod 16 of the unit 27 is engaged with the body 3. Further, an axially slidable slide chuck 12 is provided, and a tire rim 20 is mounted at the chuck 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tire chucking device in a tire uniformity machine.

[0002]

2. Description of the Related Art A tire uniformity machine for inspecting the uniformity of a tire of an automobile or the like is equipped with a chucking device for rotating a tire to be inspected while holding it. 2. Description of the Related Art As a conventional tire chucking device, there is, for example, one shown in FIGS. Among them, the tire chucking device shown in FIGS. 2 and 3 is a system widely used for general small tires (Japanese Patent Publication No. Sho 50-6922). In such a tire chucking device, a drive shaft 53 and an elevating shaft 54 are arranged corresponding to a through hole 52 provided in the middle of the tire transporting conveyor 51 so as to face upward and downward. And a split rim 5 at the end of the lifting shaft 54.
5 and 56, respectively, and the drive shaft 5
A conical fitting concave portion 57 and a conical fitting portion 58 are provided on the 3 and the elevating shaft 54 so that the shaft centers coincide with each other. An air introduction hole 59 extending vertically is formed inside the drive shaft 53, and the lifting shaft 54 is provided with a hydraulic cylinder 60.
It can be raised and lowered by.

In a tire uniformity machine equipped with the above-mentioned tire chucking device, a hydraulic cylinder 6
When the tire T is placed on the rim 56, the lifting shaft 54 and the drive shaft 53 are fitted together. In this state, the tire T is inflated (inflated) to a constant pressure through the air introduction hole 59 in the drive shaft 53. Thereafter, when the load wheel 62 attached with the load cell 61 is pressed against the tire T from the side, it is possible to perform a quality determination test such as the uniformity of the tire T. At this time, the axial repulsion due to the tire internal pressure is considerably large (10-5).
0 ton), and the conical fitting concave portion 57 and the conical fitting portion 5
The axial force generated by the hydraulic cylinder 60 in order to maintain the radial accuracy by generating an appropriate surface pressure on the shaft 8 will also be considerable. As a result, it is necessary to use a large shape as a main constituent material, and a large bearing is required for the drive shaft 53 and the elevating shaft 54. Therefore, there is a problem that the cost is increased. There is also a problem that a special bearing is required for the test at a high rotation speed.

In order to solve these problems, FIG.
A tire chucking device as shown in JP-A-2003-163455 has been proposed, and this chucking device is often used for large-sized tires having a large tire internal pressure reaction force.
5-44194). Such a chucking device includes a through-hole 7 provided in the middle of a tire transport conveyor 71.
2, a drive shaft 73 and an advancing / retreating shaft 74 are disposed facing downward and upward, respectively, and a rim 75, which fits the inner peripheral edge of the tire T,
The drive shaft 73 and the reciprocating shaft 74 are provided with a fitting portion 77 and a fitting recess 78 so that the drive shafts 73 and the reciprocating shafts 74 are fitted so that their axes are aligned. In addition, a conical wedge 80 is attached to the upper end of the spindle shaft 79, and a claw 81 is slidably fitted on the outer surface of the conical wedge 80, and the claw 81 is fitted in a sliding hole 82.

In the tire uniformity machine provided with the above-mentioned tire chucking device, the conveyor 71 descends, and the tire T is mounted on the lower rim 75 attached to the drive shaft 73. The fitting portion 78 of the shaft 74 and the fitting portion 77 of the drive shaft 73 descend.
Are engaged. In this state, when the spindle shaft 79 moves upward in the axial direction, the pawl 81 moves in the sliding hole 82 in the circumferential direction outward with the rise of the conical wedge 80 of the drive shaft 73, and the surface orthogonal to the shaft is moved. , So that the reciprocating shaft 74 is restricted from moving upward with respect to the driving shaft 73 even after inflation pressure is applied to the tire T. At this time, since the axial reaction force due to the tire internal pressure is received by the claw 81, the bearings 83, 84 of the drive shaft 73 are provided.
The force does not act on the bearing (not shown) of the reciprocating shaft 74, and a small component such as a bearing can be used.

[0006]

However, in the conventional tire chucking device described above, the radial accuracy of the advancing / retreating shaft 74 is limited by the fitting recess 78 on the advancing / retreating shaft 74 and the driving shaft 73.
Although it depends on the fitting accuracy with the fitting portion 77 on the side, since it is necessary to attach and detach each time for each tire T to be inspected, the gap between the fitting concave portion 77 and the fitting portion 78 must be increased. However, the accuracy is inferior to the method of maintaining the radial accuracy by generating surface pressure at the conical fitting portion as shown in the conventional example of FIGS. 2 and 3.

The present invention has been made in view of such circumstances, and has as its object to easily and accurately perform centering fitting of the upper and lower chucking device main bodies for each tire inspection, thereby improving radial accuracy. It is an object of the present invention to provide a tire chucking device for a tire uniformity machine which can reduce a load on a bearing or the like and requires less test driving power.

[0008]

According to the present invention, there is provided a chucking device for a tire uniformity machine having an up-down shaft and an up-down chucking device attached to a drive shaft. Wherein one of a conical fitting concave portion and a conical fitting portion for centering fitting is provided in the upper and lower chucking device main body, and one chucking device main body is engaged with the other chucking device main body. The other chucking device body is provided with a slide chuck that engages with the lock member of the lock mechanism and is slidable in the axial direction, and a tire rim is mounted on the slide chuck. Installed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 shows an embodiment of a tire chucking device for a tire uniformity machine according to the present invention. Also in the present embodiment, the overall configuration and functions of the tire uniformity machine are described in FIGS.
And the description thereof is omitted. The tire chucking device according to the present embodiment includes an upper chucking device main body 3 attached to an upper elevating shaft 1 with a tightening bolt 2, and a tightening bolt 5 attached to a drive shaft 4.
And the lower chucking device main body 6 attached in the above manner.

The upper chucking device main body 3 includes a flange portion 7 and a cylindrical portion 8 and has an upper chucking ring 9 fixed to the elevating shaft 1 with the tightening bolts 2. A conical fitting recess 11 that fits with a lower chucking ring 10 of a lower chucking device main body 6 described below is provided at a position inside the upper chucking ring 9 and located at the cylindrical portion 8. On the outer side of the upper chucking ring 9, the cylindrical portion 8 having a minimum fitting margin ("zero" clearance) required for sliding in the axial direction is formed on the coaxial core. The outer peripheral surface of the cylindrical portion 8 is a sliding surface 8a.

Outside the cylindrical portion 8 of the upper chucking ring 9, there is provided a vertically movable slide chuck 12 fitted to the sliding surface 8a. This slide chuck 1
1 is always urged downward in FIG. 1 by a plurality of springs 13 arranged circumferentially inside the flange portion 7, and its lower side is provided with a stopper block 14 fixed to the lower end of the cylindrical portion 8. It is engaged and held. The upper surface of the slide chuck 12 is engaged with a pin 15 projecting from the flange 7, and the slide chuck 12 is held by the pin 15 in a state where the movement in the rotation direction is restricted. A hook portion 17 that engages with a lock rod (lock member) 16 described later is formed at the lower end on the inside of the slide chuck 12.
The vertical movable stroke of the lock rod 16
Is set to have a minimum amount A required to easily engage or disengage with the hook portion 17 and an amount B required to leave an axial clearance with the upper chucking ring 9 when engaged. Have been. The upper chucking ring 9 and the slide chuck 12 have air passages 18 and 19 communicating with each other.
Are provided, and air for tire inflation is supplied to the tire T via the upper tire rim 20 through the air passages 18 and 19. For this reason, the upper tire rim 20 is fastened and fixed to the slide chuck 12 by the bolt 21.

On the other hand, the lower chucking device main body 6 is constituted by a base end flange portion 22, an intermediate flange portion 23, and a front end side conical fitting portion 24.
And a lower chucking ring 10 in which the base flange portion 22 is fixed to the drive shaft 4. The distal end of the lower chucking ring 10 fits with the upper chucking ring 9 of the upper chucking device 3 via the conical fitting portion 24. In addition, the lower tire rim 25 is fastened and fixed to the intermediate flange portion 23 of the lower chucking ring 10 by a bolt 26.

A rim reaction force lock device (lock mechanism) 27 is provided inside the lower chucking ring 10. The rim reaction force lock device 27 includes a lock shaft 28 that is driven vertically by a drive device (not shown).
The lock shaft 28 is disposed inside the lower chucking ring 10 so as to penetrate vertically. A cone ring 30 having a dovetail groove 29 inclined on the outer peripheral surface is fixed to the tip of the lock shaft 28, and a plurality of lock rods 16 engaging with the dovetail groove 29 are provided outside the cone ring 30. Bushing in the direction 3
1 so as to be slidable.

Next, the operation of the tire chucking device of this embodiment will be described step by step. Here, FIG.
The left half of the figure shows a state in which the upper and lower chucking device main bodies 3, 6 are lowered by the elevating shaft 1, and the respective conical fitting concave portions 11 and conical fitting portions 24 are centered and fitted. The right half side of FIG. 1 shows a state where the inflate pressure is supplied to the inside of the tire T and the tire T is being tested. (1) The upper chucking ring 9 and the lower chucking ring 10 are fitted while being centered by the conical fitting concave portion 11 and the conical fitting portion 24. (2) The lock shaft 28 is driven downward, the lock rod 16 opens outward, and is fitted to the hook 17 of the slide chuck 12. At this time, the slide chuck 12
Is urged downward by a spring 13, and there is a clearance A for fitting between the two members. (3) When the air for tire inflation is supplied through the air passages 18 and 19 in this state, a force acts in a direction in which the upper tire rim 20 and the lower tire rim 25 open due to the reaction force generated in the tire T. (4) Due to this reaction force, the slide chuck 12
, The hook 17 is engaged with the lock rod 16 and held. At this time, a clearance B is left between the upper chucking ring 9 and the slide chuck 12 so that no force is applied to the upper chucking ring 9. Therefore, the upper and lower tire rims 2 due to the tire inflation pressure
The force acting on 0 and 25 becomes an internal force here, and does not reach the elevating shaft 1 and the driving shaft 4. It should be noted that in order to secure an appropriate surface pressure on the conical fitting concave portion 11 and the conical fitting portion 24 for centering, it is natural that the lifting shaft 1 needs a pressing force in the axial direction.

In the chucking device of the present embodiment, the fitting of the upper and lower chucking rings 9 and 10 necessary for each inspection of the tire T is performed by the conical fitting concave portion 11 and the conical fitting portion 24. The centering fitting of the upper and lower chucking device bodies 3, 6 is easy and accurate. Further, in the chucking device of the present embodiment, the reaction force due to the tire inflation pressure is received by the rim reaction force lock device 27, but the engagement between the hook portion 17 of the slide chuck 12 and the lock rod 16 necessary for locking. Since the gap between the gaps is absorbed by the slide chuck 12 that slides in the axial direction with a gap of "zero", the reaction force does not affect the deflection accuracy in the radial direction. In addition, since the reaction force acting in the axial direction is reduced, the load torque of the bearing is greatly reduced, and the power for test drive is reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes may be made without departing from the spirit of the present invention. For example, the vertical direction of the lifting shaft 1 and the driving shaft 4 does not matter.

[0018]

As described above, the chucking device for a tire uniformity machine according to the present invention is a chucking device for a tire uniformity machine having a vertical chucking device body attached to a lifting shaft and a drive shaft. One of a conical fitting concave portion and a conical fitting portion for centering fitting is provided in the upper and lower chucking device main bodies, and one of the chucking device main bodies is engaged with the other chucking device main body, and the rim counterpart is provided. A lock mechanism for holding a force is built in, a slide chuck that engages with a lock member of the lock mechanism and is slidable in the axial direction is provided on the other chucking device main body, and a tire rim is mounted on the slide chuck. Therefore, the following various effects can be obtained. (1) Due to the presence of the conical fitting concave portion and the conical fitting portion, centering fitting of the upper and lower chucking device main bodies for each tire inspection can be performed easily and accurately. (2) While receiving the reaction force due to the tire inflation pressure by the lock mechanism, the gap between the fitting of the slide chuck and the lock member required for locking is absorbed by the slide chuck that slides in the axial direction with substantially “zero” gap. Therefore, the accuracy in the radial direction can be improved. (3) Since the reaction force in the axial direction is small, the load torque on the bearings and the like is greatly reduced, the power required for the test drive is reduced, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a tire chucking device of a tire uniformity machine according to an embodiment of the present invention.

FIG. 2 is a side view showing a main part of a tire chucking device in a conventional tire uniformity machine.

FIG. 3 is a cross-sectional view showing a main part of a conventional tire chucking device during tire inspection.

FIG. 4 is a cross-sectional view showing a main part of a tire chucking device in another conventional tire uniformity machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elevating shaft 2, 5 Tightening bolt 3 Upper chucking device main body 4 Drive shaft 6 Lower chucking device main body 7 Flange part 8 Cylindrical part 9 Upper chucking ring 10 Lower chucking ring 11 Conical fitting concave part 12 Slide chuck DESCRIPTION OF SYMBOLS 13 Spring 14 Stopper block 15 Pin 16 Lock rod 17 Hook part 18, 19 Air passage 20 Upper tire rim 21, 26 Bolt 22 Base flange part 23 Intermediate flange part 24 Conical fitting part 25 Lower tire rim 27 Rim reaction force lock device 28 lock shaft 29 dovetail groove 30 cone ring 31 bushing T tire

Claims (2)

[Claims] 1. A chucking device for a tire uniformity machine having an upper and lower chucking device main body attached to an elevating shaft and a drive shaft, comprising: a conical fitting recess for centering fitting in the upper and lower chucking device main body; One of the conical fitting portions is provided, and one of the chucking device main bodies incorporates a lock mechanism that engages with the other chucking device main body to hold a rim reaction force. A tire chucking device for a tire uniformity machine, comprising a slide chuck engaged with a lock member of a lock mechanism and slidable in an axial direction, and a tire rim attached to the slide chuck. 2. The slide chuck is slidably fitted with a chucking ring of a chucking device main body having a conical fitting concave portion or a conical fitting portion with zero clearance, and always receives a lock member of a lock mechanism. When the rim is biased to create a gap and a reaction force is generated on the rim, this gap becomes zero,
2. The device according to claim 1, further comprising a chucking ring inserted in the chucking ring while leaving a sliding stroke in the axial direction.
A tire chucking device for a tire uniformity machine according to item 1.