JPH0743631Y2 - Wheel balancer rotary drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application The present invention relates to a rotary drive device of a wheel balancer for detecting and measuring a balance amount and a phase of a tire wheel of a vehicle such as an automobile.

(2) Conventional Technology As a conventional rotary drive device for a wheel balancer, a method of directly driving a supporting rotary shaft on which a wheel is mounted by a motor, a method of indirectly driving by a V-belt, and a specific number of revolutions or more. In such a case, a method is known in which the drive source and the supporting rotary shaft are separated by a clutch or the like.

(3) Problems to be Solved by the Invention In the conventional wheel balancer described above, when the rotary shaft is directly driven, the structure is simple, but the vibration of the motor and the fluctuation of the rotational speed are directly transmitted to the supporting rotary shaft for measurement. If the error becomes large, or if it is driven indirectly by a V-belt,
The structure is complicated, rotation speed fluctuations occur due to belt tension, belt wear, etc., and vibration cannot be completely prevented, and the method of separating the motor and the supporting rotary shaft by a clutch is a mechanism. However, it has a drawback that it is complicated, difficult to maintain, and expensive.

The present invention solves the above drawbacks and provides a rotary drive device for a wheel balancer that has a simple structure and separates a supporting rotary shaft and a motor during measurement, improves measurement accuracy, and is inexpensive and easy to maintain. To aim.

(4) Means for Solving the Problems In order to achieve the above-mentioned object, the present invention comprises a base, a motor, and a support rotary shaft which is mounted with a wheel and rotates in association with the rotational drive of the motor. In the wheel balancer to do, while fixing the flywheel to the support rotary shaft, the motor is mounted on the tip of a swingable bracket pivotally supported on a spindle base on the base at the root,
A roller capable of contacting a peripheral surface of the flywheel is fixed to a rotation shaft of the motor, and a spring elastically springing in a direction of separating the flywheel and the roller is connected between the bracket and the base.

(5) Action After the tire wheel to be measured is fixed to the support rotary shaft, when the motor is energized, a reaction torque is generated in the bracket supporting the motor due to the rotation of the motor, and the tip portion of the bracket is resisted against the tension of the spring. Swings toward the flywheel to bring the roller and the flywheel into contact with each other to rotate the support rotary shaft. When it approaches a certain rotation, the tension of the spring becomes larger than the reaction torque, the roller and the sly wheel are separated from each other, and the supporting rotary shaft keeps rotating due to the inertia of the flywheel, and accurate measurement can be performed.

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

(1) shows a base, (2) shows a rotary bearing stand provided on the upper surface of the base (1), and a supporting rotary shaft (3) is rotatably and pivotally mounted on the rotary bearing stand (2). . Note that (2a) and (2a) indicate ball bearings. A flywheel (4) is fitted to one end of the supporting rotary shaft (3),
A fixture (5) for supporting and fixing a wheel to be measured (not shown) is fixed to the other end.

A disc (6) having a large number of slits on its circumference is fixed to the end face of the support rotary shaft (3) on the flywheel (4) side, and the phase can be detected by a sensor (7). There is.

Reference numeral (8) denotes a motor, and a small diameter roller (9) made of hard rubber or the like is fixed to a rotation shaft of the motor (8),
The motor (8) is screwed into the long holes (11a) (11a) of the auxiliary mounting plate (11) at the tip of the flat plate-like bracket (10) with bolts (11b) and (11b), and the bracket ( Ten)
A support shaft (12) is projectingly provided at the root of the support shaft (12).
Is pivotally supported by a spindle base (13) fixed to the base (1). Therefore, the motor (8) can be swung by the support shaft (12), and the roller (9) and the flywheel (4) can contact each other.

Furthermore, a boss (14) is provided at the other end of the support shaft (12), and the tip of the lever (15) protruding from the boss (14) and the spring hook (16) provided on the base (1) are provided. A spring (17) is locked between them. In addition, the bracket (1
The lower end of (0) is provided with a protruding piece (10a) bent in an L shape, and the screw hole formed in the protruding piece (10a) has a cap (18) made of an elastic material at the tip end thereof. Locking bolt (1
9) is screwed so that it can move back and forth.

Next, the operation of the present invention having the above configuration will be described. First, attach the wheel to be measured to the fixture (5). Next, when the motor (8) is energized and started in the direction of the arrow (B), a reaction torque of the rotor of the motor (8) is generated, and the reaction torque causes the bracket (10) to spring with the support shaft (12) as a fulcrum. It swings in the direction of arrow (C), that is, in the clockwise direction against the tension of (17) and becomes the state shown by the dotted line, and the roller (9) and the flywheel (4) come into contact with each other and contact by rotation of the motor (8). Is maintained, the rotation in the direction of the arrow (D) is transmitted to the flywheel (4). When the rotation of the motor (8) and the flywheel (4) approaches steady rotation, the tension of the spring (17) becomes larger than the reaction torque,
The roller (9) and the flywheel (4) are separated from each other, and the supporting rotary shaft (3) is automatically rotated by the inertia of the flywheel (4) to perform stable measurement. After that, the bracket (10) is rotated counterclockwise by the elastic force of the spring (17), the cap (18) is brought into contact with the base (1), the rotation is stopped, and the state shown by the solid line is obtained. The energization of the motor (8) is also stopped.

In addition, the bolts (11b) (11b) and the spring hook (16) are adjusted so that the motor (8), that is, the relational position between the roller (9) and the flywheel (4) and the tension of the spring (17) are appropriately optimized. Adjust the position.

(7) Effect of the Invention Thus, according to the present invention, the flywheel is fixed to the supporting rotary shaft, and the motor is mounted on the tip of the bracket pivotally supported at the root so that the motor roller contacts the flywheel. In addition to the above, a spring that springs in the direction separating the flywheel and the roller is connected between the bracket and the base, so that the supporting rotary shaft and the motor can be separated at the time of measurement with a simple structure. Can maintain stable rotation due to the inertial force of the flywheel,
Thus, the measurement accuracy can be remarkably improved, and the cost is low and the maintenance is easy.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of the present invention, and FIG. 2 is a side view thereof. (3) …… Supporting rotary shaft (4) …… Flywheel (8) …… Motor (9) …… Roller (10) …… Bracket (11) …… Spring

Claims (1)

[Scope of utility model registration request] 1. A wheel balancer comprising a motor on a base and a supporting rotary shaft mounted with a wheel and rotating in association with rotational driving of the motor, wherein a flywheel is fixed to the supporting rotary shaft, The motor is mounted at the tip of a swingable bracket that is pivotally supported at the base on a spindle base on the base, and a roller that can contact the peripheral surface of the flywheel is fixed to the rotary shaft of the motor. At the same time, a rotation drive device for a wheel balancer, characterized in that a spring that elastically separates the flywheel and the roller is connected between the bracket and the base.