JPH021674Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a phase generator in a wheel balancer.

[Prior Art] As shown in FIG. 1, in an example of a conventional wheel balancer, a wheel 2 is attached to a main shaft 1, vibration receivers 3 and 4 are brought into contact with each other, and a universal joint 5,
6 and is connected to a phase detection generator 9 by bevel gears 7 and 8. In addition, the main shaft 1 is a pulley 10,
It is driven by a motor 12 using a belt 11.

In such a wheel balancer, a phase detection generator (hereinafter simply referred to as a phase generator) is used.
requires changing the phase of the power generation signal with respect to the phase axis. That is, it is necessary to rotate the rotation case by hand during driving and measurement to change the phase of the power generation signal with respect to the phase axis. Therefore, as shown in FIG. 3, brushes 13 and slip rings 14 and 15 provided on the rotating case 16 were used to extract the power generation signal. However, this often resulted in poor contact between the brush and the slip ring, resulting in inaccurate measurements or failures.

[Problem to be solved by the invention] The problem of the invention is to create a phase power generation system that has a structure that does not have any contact parts such as brushes or slip rings for extracting the power generation signal, thereby eliminating any causes of measurement inaccuracies or failures. The aim is to provide the opportunity.

[Means for Solving the Problems] The means of the present invention is such that a wheel is attached to the main shaft rotatably supported, and a phase shaft that rotates synchronously through a transmission mechanism is erected in a rotation case, and a phase shaft is installed at the upper end of the shaft. Fix the wheel phase indicator, attach the rotor in the middle, fix the phase flange to the rotation case below the rotor, attach the coil bobbin located around the phase axis to the top surface of the phase flange, and wind it around the coil bobbin. A coil cord is connected to the rotor, a magnet is fixed to the inner surface of the rotating case in close proximity to the rotor, and the magnet wire is connected to the coil bobbin by going around the rotating outside of the magnet to change its position. A magnetic guide member that guides the coil is interposed between the coil bobbin and the magnet.

[Example] Figures 4 and 5 show an example of the present invention,
Reference numeral 20 generally indicates a phase generator. 2
Reference numeral 1 denotes a rotating case, which is made of a non-magnetic material such as aluminum. A protruding body 22 is provided on the inner surface of the upper part of the rotating case 21, one piece 24 of an L-shaped magnetic guide piece 23 is attached to the tip face of the protruding body 22, and a hole larger than the diameter of the phase shaft 26 is bored in the other piece. A phase shaft 26 made of a non-magnetic material passes through it without contact. Wheel phase indicator 2 at the upper end of the phase axis 26
A bevel gear 28 is fixed to the lower end of 7. Bevel gear 2
8 meshes with a bevel gear 30 fixed to the main shaft 29,
Both bevel gears 28 and 30 have a tooth ratio of 1:1.

25 is a magnetic guide bush 25, and a rotor 31 in which a magnet 32 is embedded is attached to a phase shaft 26 located above it. 33 is a grip, 34 is a wheel position indicator, and 38 is a phase flange to which a coil bobbin 35 is attached, and a magnetic guide bush 25 is fitted into the hole in the center thereof. Also coil bobbin 3
A coil 36 is wound around the coil 5, and a cord 37 is connected to the coil 36.

The rotating case 21 is fitted into the phase flange 38 so as to be rotatable relative to the phase flange 38. 39 and 40 indicate bearings.

Next, in the embodiment of FIG. 6, the magnet 32 is
2 side, and the magnetic guide piece 23 is formed into a cylindrical shape,
It is fitted into the coil bobbin 35 and also serves as the guide bush 25.

[Function] When the main shaft 29 is driven for measurement, the phase shaft 26
also rotate in sync. Therefore, the rotor 31 embedded from the magnet 32 rotates. The lines of magnetic force coming out of the magnet 32 flow as shown by dotted lines, but as the magnet rotates, it becomes an alternating magnetic field and generates an electromotive force in the coil. If the rotating case is rotated during measurement, the position of the magnetic guide piece 23 with respect to the phase axis 26 will change, but the lower part of the magnetic guide piece 23 that is close to the coil bobbin 35 is Magnetic field lines can be sent to the coil regardless of the phase of the magnetic field. Therefore, if the rotation case 21 is rotated, the phase axis 26 and the main axis 2
9, it is possible to obtain a power generation signal whose phase can be freely changed. However, when the wheel is mounted on the main shaft 29 in a known manner and driven, an unbalance signal reaches the phase comparator 45 shown in FIG. 2, and a signal also arrives from the phase generator. Then, turn the rotating case so that the phase of the signal from the phase generator matches the phase of the unbalanced signal. Thereafter, the unbalanced phase can be determined by stopping the drive, turning the wheel by hand, and aligning the mark on the wheel position indicator 34 on the rotation case 21 with the mark on the wheel phase indicator 27 on the phase shaft 26.

[Effects] According to the present invention, there is no electrical signal transmission due to contact between the brush and the slip ring that allows the phase generator to change the phase, so there is no failure due to poor contact. In addition, the balancer is structured so that the unbalanced vibration of the rotating part of the phase generator does not have any negative effects on other parts, and since a slight unbalance of the rotor is allowed when the rotation speed is relatively low, it is necessary to install a magnet as shown in Figure 6. 32 may be attached to the rotating case 21 and the magnetic guide piece 23 may be attached to the phase shaft 26.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional measuring mechanism, Fig. 2 is a system diagram of the measuring section, Fig. 3 is a sectional view of a conventional phase generator, and Fig. 4 is a phase generator showing an embodiment of the present invention. 5 is a sectional view taken along line A--A in FIG. 4, and FIG. 6 is a sectional view showing another embodiment. 21...Rotating case, 23...Magnetic guide piece, 2
6...Phase axis, 29...Main shaft, 31...Rotor,
32... Magnet, 35... Coil bobbin, 36...
Coil, 37... code.

Claims (1)

[Claims for Utility Model Registration] A phase generator in a wheel van lancer consisting of a combination of the following three elements (a), (b), and (c). (a) A phase shaft with a wheel attached and rotatably supported and a phase shaft that rotates synchronously via a transmission mechanism is installed upright in a rotating case, a wheel phase indicator is fixed to its upper end, and a rotor is mounted in the middle. (b) A phase flange was fixed to the rotating case on the underside of the rotor, a coil bobbin located around the phase axis was attached to the top surface of the phase flange, and a cord was connected to the coil wound around the coil bobbin. (c) fixing a magnet on the rotor or on the inner surface of the rotating case in close proximity to the rotor, changing its position by orbiting along the rotating outside of the magnet, and connecting the magnet wire of the magnet to the coil of the coil bobbin; A magnetic guide member that guides the coil is interposed between the coil bobbin and the magnet.