JPH02130451A - Maintenance apparatus for wheel - Google Patents

Abstract

PURPOSE:To facilitate the keeping of a force working on a pressure roller constant by a method wherein one side wall of groove-shaped metal is fixed at the center of the back of a vertical wall while a load cell is mounted on a bottom wall of the groove-shaped metal and a hydraulic cylinder is provided between a strut erected at other end of a base and the other side wall of the groove-shaped metal. CONSTITUTION:A vertical wall 3c is erected on a moving base 3a as orthogonal to a direction of advancing while a pressure roller 3j having a roller shaft 3k vertically is mounted on the surface of the vertical wall 3c and one side of a groove-shaped meal 5a is fixed on the back of the vertical wall 3c while a load cell 5b is mounted on the bottom wall of the groove-shaped metal 5a. A hydraulic cylinder 4a is provided between a strut 1c erected at other end of a base 1a and the other side wall of the groove-shaped metal 5a. With such an arrangement, as both side walls of the groove-shaped metal 5a approach or separates from each other, a tensile distortion is caused on an external side of the bottom wall of the groove-shaped metal 5a and the load cell 5b is positioned at the affected point. This can simplify the entire construction.

Description

[Detailed Description of the Invention] [Industrial Field of Application] When replacing a tire fitted to the rim of a wheel attached to an automobile, the rim and tire are matched by a uniform matching machine, and then a wheel balancer is used. and a balance weight is installed.

This invention relates to a uniform matching wheel maintenance device.

[Conventional technology] This will be explained with reference to FIGS. 7 and 8.

The wheel 6a fitted with the new tire 6b is mounted on the central shaft 2a. A movable table 8a is slidably mounted on a rail 7b on a base 1a. A pinion 8n meshes with a rack 8m fixed to the movable table 8a, and the movable table 8a moves together with the rack 8m by forward and reverse rotation of the pinion 8n. A rotating frame 8e is rotatably supported by a vertical pivot 8f installed at one end of the front side of the moving table 8a,
A pressure roller 8j is supported on the rotating frame 8e by a vertical roller shaft 8h. A load cell 8g is arranged at the other end of the front surface of the movable table 8a, and the rotating frame 8e is connected thereto.

When the center shaft 2a is rotated at a gentle angular speed with the pressure roller 8j pressed against the tire 6b with a given amount of the pinion 8n, the output value of the load cell 8g changes in accordance with the change in the tire outer radius. The output value of the load cell 8g changes, and due to the change in the value of the tire outer radius R from the wheel center axis 0-0, △R
is calculated.

The contact surface of the tire bead of the rim 6c is called a bead seat surface, and a rim displacement measuring mechanism 9a is arranged on the rim surface corresponding to the back surface of this bead seat surface. therefore,
Due to the warm angular velocity rotation of the wheel 6a, the wheel center axis 0-0
Δr is calculated based on the change in radius r of the bead seat surface from . The thickness of the tire 6b is expressed by (R±△R)−(r±△r), which corresponds to the rotation angle α from the reference point.

Therefore, either bring the portion of the tire 6b of maximum thickness to the minimum radius of the bead seat surface of the rim 6C, or
Place the tire 6b against the rim 6C so that the minimum thickness part of the tire 6b is at the maximum radius of the bead seat surface of C.
Uniformity matching is performed by rotating b.

[Problems to be Solved by the Invention] In the conventional system described above, since the rack is moved by a pinion, it not only takes time to move the pressure roller, but also it is necessary to keep the force applied to the pressure roller constant to prevent the pressure roller from buckling. Since the movement was not smooth, it was inevitable that some errors would occur in the measured values.

This invention makes it easier to keep the force applied to the pressure roller constant, and also makes the movement of the pressure roller smoother, thereby speeding up measurement and improving accuracy.

[Means to solve the problem] This will be explained with reference to the drawings.

The wheel maintenance device according to the first invention has a central shaft 2a for mounting a wheel erected near one end of the base 1a, and a base l
A horizontal rail lb for the movable table 3a facing the central axis 2a is installed on the movable table 3a, a vertical wall 3C perpendicular to the direction of movement is erected on the movable table 3a, and a roller is installed vertically on the front side of the vertical wall 3c. Axis 3
A pressure roller 3j having a diameter k was attached, and one side of the groove-shaped metal fitting 5a was fixed to the back side of the vertical wall 3C, and a load cell 5b was attached to the bottom wall of the groove-shaped metal fitting 5a, and the load cell 5b was erected at the other end of the base 1a. A hydraulic cylinder 4a is provided between the support column 1c and the other side wall of the groove-shaped metal fitting 5a.

Further, the wheel maintenance device according to the second invention has a center shaft 2a upright on the front part of the base frame 11, on which the wheel 6a is fitted horizontally, and a base 1a on the other side of the front part of the base frame 11. A movable base 3a that moves forward and backward toward the central axis 2a is provided on the base la, and the movable base 3
A vertical wall 3C facing the central axis 2a is provided on the top a, and a plurality of small-diameter pressure rollers 3j having roller shafts 3k in the vertical direction are supported in parallel on the front side, and hydraulic pressure is applied to push the movable table 3a from the back side with a constant pressure. In addition to providing a cylinder 4a, a pressure roller 3j
A load cell 5b for measuring the displacement position of the roller shaft 3 is provided between the pressure roller 3j and the hydraulic cylinder 4a, a tire stripping mechanism 24 is provided behind the central shaft 2a, and a central shaft is located below the central shaft 2a. A rotation drive device 12 is installed.

[Operation] The wheel 6a fitted with the new tire 6b is mounted on the central shaft 2a.

When the central shaft 2a is rotated at a gentle angular speed while the pressure roller 3j is in pressure contact with the tire 6b by supplying pressure oil to the hydraulic cylinder 4a, the output value of the load cell 5b changes in accordance with the change in the outer circumferential radius of the wheel. The output value of the load cell 5b changes, and due to the change in the value of the tire outer radius R from the wheel center axis 0-0 axis, △
R is calculated.

The contact surface of the tire bead of the rim 6c is called a bead seat surface, and a rim displacement measuring mechanism 9a is arranged on the rim surface corresponding to the back surface of this bead seat surface. Therefore, due to the rotation of the wheel 6a at a slow angular velocity, Δr is calculated based on the change in radius r of the beat seat surface from the wheel center axis O-0. The thickness of the tire 6b is expressed as ((R±ΔR)−(r±Δr)l, which corresponds to the rotation angle α from the reference point.

Therefore, either bring the portion of the tire 6b of maximum thickness to the minimum radius of the bead seat surface of the rim 6C, or
Place the tire 6 against the rim 6c so that the minimum thickness of the tire 6b is at the maximum radius of the bead seat surface of C.
Uniformity matching is performed by rotating b.

[Example] 11 is a base frame, and 2a is a vertical central shaft rotatably supported by the base frame 11 via a ball bearing 13.

14 is a balancer pulley that is rotatably fitted and supported on the center shaft 2a; 15 is a slide clutch that is non-rotatably and slidably fitted on the center shaft 2a; and 16 is a uniform shaft that is rotatably fitted and supported on the center shaft 12. By moving the slide clutch 15 up and down with the balancer pulley 14 or the uniform pulley 1,
Reference numeral 17 is a balancer motor configured to rotate the balancer 6 together with the central shaft 2a, and is connected to the balancer pulley 14 via a belt 18. A uniformity motor 19 is connected to the uniformity pulley 16 via a deceleration power transmission mechanism 20. When the slide clutch 15 is connected to the balancer pulley 14 and the balancer motor 17 is rotated, the center shaft 2a rotates rapidly, and when the slide clutch 15 is connected to the uniformity pulley 16 and the yumufomity motor 19 is rotated, the center shaft 2a is rotated. The shaft 2a rotates slowly.

However, balancer motor 17. Belt 18, balancer pulley 14. Uniformity motor 1
9. Deceleration power transmission mechanism 20. Pulley for uniformity 16. The slide clutch 15 constitutes a central shaft rotation drive device 12 .

21 is a phase sensor for uniformity provided at the bottom of the center shaft 2a, 22 is a position sensor for balancer provided at the bottom of the center shaft 2a, and 23 is a wheel 6a which is laid down sideways and is fitted and fixed to the top of the center shaft 2a. It is a fixture.

9a is a rim displacement measuring mechanism placed below the wheel 6a;
It is configured to be able to move into and out of contact with the bead seat of the rim 6c.

A center shaft 2a for mounting a wheel is erected near one end of the base 1a, and a horizontal rail 1b for the movable table 3a facing the center shaft 2a is installed on the base la.

The movable table 3a is mounted on the horizontal rail lb via a linear bearing 3b mainly composed of 3 m of steel balls.

A vertical wall 3c that is perpendicular to the moving direction is erected on the movable table 3a, and brackets 3d are provided above and below the surface of the vertical wall 3c.

A vertical roller shaft 3k of at least one pressure roller 3j is supported by the upper and lower brackets 3d. One side wall of a steel groove-shaped metal fitting 5a is fixed to the center of the back surface of the vertical wall 3c, and a load cell 5b is attached to the bottom surface of the groove-shaped metal fitting 5a.

A hydraulic cylinder 4a is provided between the support column 1c erected at the other end of the base 1a and the other side wall of the groove-shaped metal fitting 5.

Air at a constant pressure from the compressed air source 4c is applied to the upper part of the hydraulic tank 4b, and the pressurized oil in the oil tank 4b is supplied to the switching valve 4.
d to the hydraulic cylinder 4a.

Reference numeral 24 denotes a tire stripping mechanism, in which an outer cylinder 28 having a lower bead presser pawl 27 is slidably inserted within a certain range into a receiver 26 that can be moved forward and backward by rotation of a handle 25, and an upper bead presser pawl 29 is inserted and supported. The lower part of the outer cylinder 28 is connected to the cylinder body 32 of the air cylinder 31, and the lower part of the inner cylinder 30 is connected to the piston 33 of the air cylinder 31. By switching the valve 34, the air cylinder 31 is shortened, and the bead presser claws 27, 29 compress the tire 6b and peel it off from the rim 6c.

35 is a shifter mechanism provided at the tip of an arm 37 that is rotatably attached to the vertical pivot 36 of the base frame 11;
This is used when attaching and detaching the bead portion b to the rim 6c.

After installing the wheel 6a on the central shaft 2a, the tire stripping mechanism 2
4, the tire 6b is peeled off from the rim 6c while rotating the wheel 6a, and then the tire 6b is removed from the rim 6C by the shifter mechanism 35 while rotating the tire 6b. After fitting a new tire onto the rim 6C using the shifter mechanism 35, air is injected into the tire 6b. The uniformity is measured while the wheel 6a is slowly rotated by the uniformity motor 19. After removing the air from the tire 6b, the tire stripping mechanism 24 removes the tire 6b from the rim 6C.
Peel off. Therefore, the position of the tire 6b with respect to the rim 6C is adjusted. After that, air is again injected into the tire 6b,
The position and size of the balance weight to be attached to the wheel 6a while the wheel 6a is rapidly rotated by the balancer motor 17 (if necessary, the slide clutch 15 is disengaged and the wheel 6a is rotated only by inertia). Measure. Then, a balance weight of a predetermined size is attached to a predetermined position of the wheel 6a.

Therefore, once the wheel 6a is attached to the central shaft 2a,
Various tasks can be performed continuously, making the tasks easier and faster.

[Effects of the Invention] In the present invention, the load cell 5b is attached to the bottom wall of the groove-shaped metal fitting 5a attached to the back surface of the moving table 3a. When both side walls of the groove-shaped metal fitting 5a approach or separate, tensile strain occurs on the outer surface side of the bottom wall of the groove-shaped metal fitting 5a, and compressive strain occurs on the inner surface side. Since the load cell 5b is attached to the location where this distortion occurs, the overall structure can be simplified.

Further, in this invention, once the wheel 6 is attached to the center shaft 2a,
If a is installed, the maximum centrifugal force of the rim 6c and the tire 6b
Since the maximum value of centrifugal force can be located on the same radius line and the measured balance weight can be attached,
It has the characteristic of being able to perform good assembly quickly.

[Brief explanation of drawings]

1 to 6 show an embodiment of the present invention, in which FIG. 1 is a front view of a part of the device, FIG. 2 is a plan view of FIG. 1,
Fig. 3 is a sectional view taken along line mm in Fig. 1, Figs. 4 and 5 are plan views of different embodiments of the grooved fitting, and Fig. 6 is a vr of Fig. 2.
-Vt is a side view at the arrow position. FIG. 7 is a front view of the conventional device, and FIG. 8 is a sectional view taken along the line -■ in FIG. 1a Base 1b Horizontal rail 1c Support 2a Central shaft 3a Moving table 3b Linear bearing 3C Vertical wall 3d Bracket 3j Pressure roller 3k Roller shaft 3m Steel ball 4a Hydraulic cylinder 4b Oil tank 4C Compressed air source 4d Switching valve 5a Groove fitting b 6a b C b a e f g j h m na 0-Dosel Wheel Tire Rim Rail Moving platform Swivel frame Pivot Load cell Pressure roller Roller shaft Rack pinion Rim Displacement measuring mechanism Base frame Central shaft rotation drive device Ball bearing Booley slide clutch for balancer Mitei pulley 37 arms

Claims (1)

[Claims] 1. A center shaft (2) for mounting a wheel near one end of the base (1a).
a) is erected, and the central axis (1a) is placed on the base (1a).
A horizontal rail (1b) is installed for the moving platform (3a) facing 2a), and a vertical wall (3c) perpendicular to the direction of movement is erected on the moving platform (3a), and the front side of the vertical wall (3c) is installed. A pressure roller (3j) having a roller shaft (3) is installed in the vertical direction, and a groove-shaped metal fitting (5a) is installed at the center of the back side of the vertical wall (3c).
While fixing one side wall, a load cell (5b) is attached to the bottom wall of the groove-shaped metal fitting (5a), and a column (1c) erected at the other end of the base (1a) and other parts of the groove-shaped metal fitting (5a) are attached. A wheel maintenance device for uniform matching, characterized in that a hydraulic cylinder (4a) is provided between the side wall and the side wall. 2. A central shaft (2a) on which the wheel (6a) is fitted horizontally is installed on one side of the front part of the base frame (11), and a base (1a) is provided on the other side of the front part of the base frame (11). , base (
1a) A movable table (3) that moves forward and backward toward the central axis (2a)
a), a vertical wall (3c) facing the central axis (2a) is provided on the movable table (3a), and a small diameter pressure roller (3j) having a roller axis (3k) in the vertical direction is provided in front of the vertical wall. A hydraulic cylinder (4a) that supports a plurality of rollers in parallel and pushes the moving table (3a) with a constant pressure from the back side is provided, and a load cell (5b) that measures the displacement position of the roller shaft (3k) of the pressure roller (3j).
is provided between the pressure roller (3j) and the hydraulic cylinder (4a), a tire stripping mechanism (24) is provided behind the center shaft (2a), and a center shaft rotation drive device is provided below the center shaft (2a). A wheel maintenance device characterized in that (12) is installed.