JPH0242912Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Industrial Application Field The present invention relates to a wheel balancer correction device for measuring unbalance of vehicle wheels.

(2) Prior art As a conventional wheel balancer of this kind, a receiving cup is fitted to the root side of a rotating shaft that protrudes laterally from the wheel balancer body, and a centering center cone is slidably fitted to the rotating shaft. At the same time, a main coil spring loosely fitted to the rotating shaft is interposed between the end surface of the centering center cone and the inner bottom surface of the receiving cup, and a wheel holding cup is slidably attached to the tip side of the rotating shaft. There is a known type in which the wheel is held under pressure between the end face of the receiving cup and the end face of the wheel holding cup by inserting the wheel and tightening a tightening nut that is threaded onto the thread at the tip of the rotating shaft. There is.

(3) Problems to be Solved by the Invention According to this conventional wheel balancer, there is an imbalance in the main coil spring, and it is necessary to correct this imbalance. As a method of correcting the unbalance, the method usually used is to remove a mass corresponding to the amount of unbalance or add a counterweight.

However, in the case of the main coil spring, removing the mass means partially reducing the wire diameter of the main coil spring, which not only makes it impossible to exhibit the spring performance expected at the time of design, but also In the worst case, there is a risk of the main spring breaking, and there is a problem in that it is impossible to use a method of removing mass. In the method of adding counterweights of various shapes made of soft metal materials such as lead, which are often used in cases of There was a problem in that the function as a counterweight could not be achieved due to the mounting position changing from the correction point or falling off.

It is an object of the present invention to solve these problems and provide a simple and reliable unbalance correction device.

(4) Means for Solving the Problems In order to achieve the above object, the present invention is characterized in that the counterweight for correcting imbalance is formed by a small coil spring that is fixed by slidingly fitting onto the main coil spring. shall be.

(5) Action With the main coil spring attached to the rotating shaft, measure the amount and position of the unbalance in the main coil spring, and after measuring, cut the small coil spring to the mass necessary to correct the unbalance. The small coil spring after cutting is slid and fitted onto the main coil spring to a position required for correction on the main coil spring and fixed.

(6) Examples An embodiment of the present invention will be described with reference to the drawings.

Reference numeral 1 indicates a wheel balance main body, 2 indicates a rotating shaft protruding to the side of the main body 1, a receiving cup 3 is fitted to the root side of the rotating shaft 2, and a centering center cone is fitted to the middle part of the rotating shaft 2. The main coil spring 6 was loosely fitted onto the rotating shaft 2 and interposed between the inner bottom surface of the receiving cup 3 and the end surface of the centering center cone 4.

5a and 5b indicate counterweights, these counterweights 5a and 5b are made of small coil springs, and these small coil springs 5
The inner diameters of a and 5b are slightly larger than the wire diameter of the main coil spring 6.

In addition, 7 is a wheel holding cup inserted into the tip side of the rotating shaft 2, 8 is a tightening nut that is screwed into the thread at the tip of the rotating shaft 2, 8a is a handle of the tightening nut 8, and A indicates an automobile wheel.

Thus, the receiving cup 3, the main coil spring 6, the centering center cone 4, and the wheel holding cup 7.
Then, with only the rotating shaft 2 with the tightening nut 8 removed, the rotating shaft 2 is rotated to perform zero adjustment. After that, attach the receiving cup 3 to the rotating shaft 2, the main coil spring 6 before attaching the small coil springs 5a and 5b, the centering center cone 4, and the tightening nut 8 with zero adjustment to the rotating shaft 2. The rotating shaft 2 is rotated to measure the amount and position of unbalance. After that, remove the tightening nut 8 and centering center cone 4 from the rotating shaft 2, and attach the small coil spring 5 to the mass necessary to correct the imbalance.
After cutting a and 5b, attach the small coil spring 5.
a and 5b are fitted and slid onto the main coil spring 6 to the position required for correction on the main coil spring 6, and both are fixed with adhesive or the like.

After correcting the imbalance in this way,
Attach the centering center cone 4 to the rotating shaft 2,
Measure the unbalance of wheel A as shown in Figure 2.

(7) Effects of the invention As described above, according to the invention, the counterweight for correcting unbalance is formed by a small coil spring that is fixed by fitting into the main coil spring. There is no need to reduce the wire diameter of the main coil spring, and the main coil spring does not fall off due to expansion and contraction during use, unlike adding a conventional counterweight, and is securely fixed to the main coil spring, making it easier to use. It has the effect of being simple.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of one embodiment of the present invention, and FIG. 2 is a perspective view of its essential parts. 1...Wheel balancer body, 2...Rotating shaft, 3...Receiving cup, 4...Centering center cone, 5a, 5b...Counterweight, 6...
...Main coil spring, 7...Wheel retainer cup,
8... Tightening nut, A... Wheel.

Claims (1)

[Scope of utility model registration request] A receiving cup is fitted to the root side of the rotating shaft that protrudes laterally from the wheel balancer body, a centering center cone is slidably inserted into the rotating shaft, and a main coil spring is loosely fitted to the rotating shaft. is interposed between the end surface of the centering center cone and the inner bottom surface of the receiving cup, a wheel holding cup is slidably inserted into the tip side of the rotating shaft, and is screwed into the thread at the tip of the rotating shaft. In a wheel balancer of a type in which a wheel is held under pressure between the end face of the receiving cup and the end face of the wheel holding cup by tightening a matching tightening nut, an unbalance correction counterweight is fitted and slid onto the main coil spring. A wheel balancer imbalance correction device characterized by being formed by a small coil spring that moves and fixes.