JPH0624756Y2 - Wheel balancer tire rotation drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a tire rotation drive device in a wheel balancer used to check and correct the balance state of a wheel fitted with a tire.

[Prior Art] In a wheel balancer, an eccentric load is checked while the wheel is rotating. Then, the wheel is rotated by the rotation of the motor, and the wheel is kept at a constant rotation speed (for example, 300 rotations / minute) to check the balance state of the wheel.

At this time, since it is not preferable that the vibration of the motor is transmitted to the wheel, a method of interposing a V belt in the middle to prevent the transmission of the vibration is adopted.

Also, using an automatic clutch for a part, stop the motor when the wheel reaches a predetermined number of rotations, turn off the automatic clutch, rotate the wheel only by inertial force, and adjust the balance state of the wheel during the inertial rotation. The method of checking is also adopted.

[Problems to be Solved by the Invention] In the case of using the above-mentioned V-belt, it is impossible to prevent the rotation of the motor from being slightly transmitted to the wheel, which causes a large measurement error. In addition, the one using the inertial force has a bad balance of the clutch when the clutch is put in, and is a new source of vibration.

This invention checks the balance state of the wheel only by the inertial force of the wheel to improve the measurement accuracy.

[Means for Solving Problems] A tire rotation drive device for a wheel balancer according to the present invention includes a drive shaft 1b connected to a motor 1a and wheels 2a.
The driven shaft 2b to be mounted is arranged on the same axis XX, and the cylindrical member 3a is rotatably supported on the outer periphery of the tip of the drive shaft 1b.
A diametrical guide groove 3b is provided on the front surface of the cylindrical member 3a,
The return piece is formed by slidably fitting the radius pieces 4c of the pair of clutch shoes 4a, which are composed of the arcuate portion 4b and the radius piece 4c extending from the midpoint thereof, into the guide groove 3b and being stretched between the opposing ends of the clutch shoes. The spring 4e brings the inner peripheral surface of the clutch shoe 4a into contact with the outer peripheral surface of the cylindrical member 3a, and supports the blade piece 5a fitted with the central elongated hole 5b on the support shaft 1c at the front end of the drive shaft. The inclined outer surface 5c, which is provided at the tip and whose radial direction position gradually increases from the rotational direction advancing side to the lagging side, is gradually moved from the advancing direction in the rotational direction of the clutch radius piece 4c toward the lagging side. Inclined inner surface 4d that becomes large
A driven disk 6a surrounding the clutch shoe 4a by making surface contact with the disk
Is fixed to the driven shaft 2b.

[Operation] When the drive shaft 1b rotates while the driven shaft 2b is stopped, the radius piece 4 is moved by the inclined outer surface 5c of the blade piece 5a.
By pressing the inclined inner surface 4d of c, the cylindrical member 3a is rotated together with the clutch shoe 4a (Fig. 3).

When the rotation increases, the clutch forces 4a, 4a move in the radial direction against the return spring 4e by the centrifugal force, and come into contact with the driven disk 6a. At this time, if there is a difference (based on the difference in clearance) between the contact states of the clutches 4a, 4a with the driven disk 6a, the spindle 1c
The blade piece 5a moves relative to the inclined outer surface 5c and the inclined inner surface 4
the sliding displacement contact with d
While being balanced, it is strongly pressed against the driven disk 6a to rotate the driven shaft 2b (Fig. 4). When the motor with a brake 1a is stopped for a predetermined number of rotations, the drive shaft 1b stops, and the return springs 4e pull the clutches 4a, 4a in the direction of the support shaft 1c and separate from the driven disk 6a (Fig. 3). . Then, the driven disk 6a, the driven shaft 2
b, the wheel 2a continues to rotate. In this state, check the balance of the wheels.

[Example] The drive shaft 1b connected to the motor 1a and the driven shaft 2b to which the wheel 2a is attached are arranged on the same axis XX. The drive shaft 1b is configured by fitting a bush with a flange 1f into a shaft body 1d and fixing it with a key 1e.

A cylindrical member 3a is rotatably supported on the outer periphery of the tip of the drive shaft 1b with a ball bearing 3c.

A diametrical guide groove 3b is provided on the front surface of the cylindrical member 3a,
The return piece is formed by slidably fitting the radius piece 4c of the pair of clutch shoes 4a, which is composed of the arcuate portion 4b and the radius piece 4c extending from the midpoint thereof, into the guide groove 3b and tensioned between the opposite ends of both clutches. The spring 4e brings the inner peripheral surface of the clutch shoe 4a into contact with the outer peripheral surface of the cylindrical member 3a, and supports the blade piece 5a fitted with the central elongated hole 5b on the support shaft 1c at the front end of the drive shaft. The inclined outer surface 5c, which is provided at the tip and whose radial direction position gradually increases from the rotational direction advance side to the delay side, is gradually moved from the rotational direction advance side of the clutch radius piece 4c toward the delay side. It is brought into surface contact with the inclined inner surface 4d which becomes larger. The support shaft 1c may be a bolt type screwed into the shaft body 1d. A retaining plate 3d is attached to the end surface of the cylindrical member 3a with a bolt 3e.

A driven disk 6a surrounding the clutch shoe 4a is fixed to the driven shaft 2b.

[Advantage of the invention] Since no belt is used, an error due to the vibration of the belt does not occur, so that the eccentric load can be accurately measured. And no intermediate pulley device is required. Furthermore, the cost is lower and the clutch and brake can be used together.

Further, when the blade 5a with the long hole 5b is not used, the pair of clutch clutches 4a, 4a cannot be maintained in balance and are unevenly contacted. Therefore, in the present invention, the balance of the pair of clutch clutches 4a, 4a is not achieved. Thus, the driven shaft 2b can be smoothly rotated without generating abnormal vibration.

[Brief description of drawings]

FIG. 1 is a front view of the whole vertical section, FIG. 2 is the same view in a disassembled state, FIG. 3 is a side view taken along the line AA of FIG. 1, and FIG. 4 is a same view in a rotating state. 1a ... motor 1b ... driving shaft 1c ... spindle 1d ... shaft body 1e ... key 1f ... bush with flange 1g ... washer 2a ... wheel 2b ... driven shaft 3a ... cylindrical member 3b .... Guide groove 4a ...... clutching 4b ...... arc part 4c ...... radius piece 4d ...... inclined surface 4e ...... return spring 5a ...... wing piece 5b ...... long hole 5c ...... inclined surface 6a ...... driven disk

Claims (1)

[Scope of utility model registration request] 1. A drive shaft (1) connected to a motor (1a).
b) and the driven shaft (2b) to which the wheel (2a) is attached are arranged coaxially (XX), and the cylindrical member (3a) is rotatably supported on the outer periphery of the tip of the drive shaft (1b). Material (3
The radial piece (4c) of the pair of clutch shoes (4a), which is provided with the diametrical guide groove (3b) on the front surface of a) and is composed of the circular arc portion (4b) and the radial piece (4c) protruding from its midpoint. Is slidably fitted into the guide groove (3b), and the return spring (4e) is stretched between the ends of the opposite clutches so that the inner peripheral surface of the clutchie (4a) is attached to the outer peripheral surface of the cylindrical member (3a). The blade (5a) in which the central elongated hole (5b) is fitted to the support shaft (1c) at the front end of the drive shaft, and the blade is delayed from the forward side in the rotational direction provided at the tip of the blade (5a). Inclination of the inclined outer surface (5c) where the radial position gradually increases toward the side from the advance side to the lag side in the rotation direction of the clutch radius piece (4c) where the radial position gradually increases. Surface contact with the inner surface (4d) , Tire rotation drive wheel balancer, characterized in that fixed Kuratsuchishiyu the driven disc (6a) surrounding (4a) to the driven shaft (2b).