Measuring and testing – Rotor unbalance – Dynamic
Reexamination Certificate
1999-06-28
2001-09-25
Chapman, John E. (Department: 2856)
Measuring and testing
Rotor unbalance
Dynamic
C073S475000
Reexamination Certificate
active
06293146
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a wheel balancing device for use in a vehicle, more particularly to a wheel balancing device capable of exactly detecting both data for longitudinal and traversal vibrations due to an unbalance of the wheels of a vehicle.
2. Description of the Related Art
Various attempts to reduce an unbalance of wheels of a vehicle have been made. In European Patent No. 0836086 A2 which was filed on Sep. 30, 1997 in the name of Buzzi Carlo, entitled “DEVICE FOR AUTOMATICALLY xCLAMPING WHEELS IN A WHEEL-BALANCING DEVICE”, a hollow shaft
17
supports a flange
2
clamping a wheel
1
at its one end, a second shaft
4
being movable in the hollow shaft
17
by a spring having a previous load exerted thereon, and the wheel
1
is clamped when the second shaft
4
is moved away from the clamping flange
2
and the wheel
1
is released therefrom, with the spring being operated when the second shaft
4
is moved to the clamping flange
2
by a hydraulic cylinder
11
. The device includes two gas springs
8
parallel to the second shaft
4
, with the gas spring
8
being arranged and mounted between a free end
4
a
of the second shaft
4
and a pulley
9
fixed to the hollow shaft
17
.
The balancing device constructed in this manner uses a pair of piezoelectric transducers at a right angle with each other in order to measure balancing data.
However, this type of measurement has a shortcoming in that when the hollow shaft connected to the wheel is rotated, the transducers cannot make an exact measurement of the strain on the shaft.
SUMMARY OF THE INVENTION
It is, therefore, a primary object of the invention to provide to a wheel balancing device capable of exactly and promptly measuring longitudinal and traversal vibrations by a plurality of bearings arranged and mounted on a shaft by directly detecting a strain value of the shaft.
The above and other objects of the invention are accomplished by providing a wheel balancing device for use in a vehicle comprising: a pulley rotated by a rotation of a motor through a belt; a main shaft adapted to rotated with said pulley; a first bearing housing mounted around the main shaft to guide the main shaft; a second bearing housing mounted near the first bearing housing and rotatably supporting the main shaft; a pulse generator mounted near the second bearing housing and having a plurality of slots for generating a pulse; a pulse detector mounted near the pulse generator to detect the pulse signal from the pulse generator; a wheel support on which a wheel is closely supported having a hollow space therewithin and mounted near the pulley; a stop for preventing the wheel from deviating from the wheel support when the wheel rotates, being supported by the wheel support, the deviation stop mounted near the wheel support; a first vibration detection means mounted under the first bearing housing to detect a vibration of the first bearing housing; and a second vibration detection means mounted under the second bearing housing to detect a vibration of the second bearing housing.
In accordance with one aspect of the present invention, a wheel balancing device for use in a vehicle comprises: a first amplifying section for amplifying the signal detected by a first sensing member and a second sensing member; a distance measuring section for measuring a strain of the main shaft by referring to a distance from the first sensing member to a wheel and a distance from the second sensing member to the wheel; a display section for making a display; an alarm section emitting a predetermined alarm; a microprocessor for receiving a signal from a second amplifying section, when an operator switches on a key control, and for allowing the display section to display or allowing the alarm section to emit the alarm or controlling a rotations speed of a motor, on a basis of the signal from the second amplifying section; a door control for opening/closing a door by receiving a signal from the microprocessor; and a motor control for controlling the motor by receiving the signal from the microprocessor.
REFERENCES:
patent: 4457172 (1984-07-01), Mathes et al.
patent: 4759217 (1988-07-01), Brihier et al.
patent: 5377542 (1995-01-01), McConnell et al.
patent: 0 836 086 A2 (1998-04-01), None
Bacon & Thomas PLLC
Chapman John E.
LandOfFree
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