DE2529767A1 - WHEEL BALANCE TESTING DEVICE - Google Patents

Description

Wheel imbalance tester

The invention relates to a wheel imbalance testing device for vehicles in which the wheel of the motor vehicle rotates without being removed from the vehicle. Such test devices are commonly called test devices "for testing directly on the vehicle".

A previously used embodiment of a wheel balancing device "for balancing directly on the vehicle" had a drive device whose drive roller is operatively connected to a drive motor and a scanning device. To the The scanning device includes an encoder head or encoder that is attachable to a portion of the vehicle suspension. This part of the The wheel suspension experiences vibrations as soon as an unbalanced wheel is set in rotation with the drive device will. The use of a device in this embodiment requires that the vehicle with a separate Jack is raised before the wheel is driven. Using this device is not advantageous when a vehicle undergoes a series of tests while it is along a diagnostic lane or

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A similar test lane is driven or moved in which tests are carried out at stations that are spaced apart from one another. The operations required to bring the jack into position, to actuate it and then to set the drive device on the wheel to be tested when the drive roller is in contact with the wheel are time-consuming and cause blockages in the diagnosis line. So that the jack and the drive device are correctly positioned and the part of the ϊιεΛ suspension provided for the attachment of the transmitter is correctly selected, this work must be carried out by qualified personnel, while the personnel involved in vehicle inspections in a diagnostic line often only needs to record whether the vehicle is in use a tuned rebuke: has passed or not.

Another embodiment of a wheel alignment device; riach an older proposal points in pairs and at a distance from one another arranged lumps, which are assigned to a drive device built into the floor of a diagnostic stand are. The xi wheels of the vehicle to be tested are retracted between the rollers at right angles to the roller axes. In this case, the weight of the vehicle rests on these rags while they rotate and the test is carried out will. For this reason, a considerable amount of power is required to drive the wheels. In addition, the Sensitivity a certain decrease due to the pressure exerted on the wheel to be tested from the support of the vehicle weight.

The invention is based on the object of a Hadunwucht-P to create a call device that can be built into a diagnostic road and which can be put into operation quickly and easily leaves.

For this purpose, a wheel imbalance tester is used assumed for vehicle wheels that have a lane or platform to drive the vehicle up and down with its own

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Wheels along a movement path, at least one roller which is arranged under the moving platform, but is exposed through an opening in the moving platform and can be driven by a motor to rotate the vehicle wheel to be tested, a vibration sensor that can be attached to the vehicle for sensing the wheel imbalance and outputting an electrical output signal, as well as a circuit connected to the shock-vibrating device with a display device for displaying the size of the unbalance.

Such a wheel imbalance test device is according to the invention characterized by a lifter for raising at least the part of the vehicle that is close to the wheel to be tested, to lift the wheel from the mobile platform and to release it for rotation, and by a lifting element to raise the / §iä ^? driven roller from a lower to an upper position in order to drive the in its upper release position to bring the wheel to be tested to the facility on the same.

Kit of the wheel imbalance test device designed according to the invention can be used on a wide variety of vehicles achieve exact and reliable test results.

The invention is described below with reference to schematic drawings an exemplary embodiment explained with further details. In the drawing shows:

Fig. 1 is a view from above of the wheel imbalance testing device, partially cut away Representation of the floor cover plate,

FIG. 2 shows a section along the line 2-2 in FIG. 1 and on an enlarged scale,

3 shows a section along the line 3-3 in FIG. 1 and on an enlarged scale,

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? ig. Figure 4 is a section along line 4-4 in Pig. 3,

Pig. 5 shows a hydraulic and electrical circuit diagram the hydraulic circuit and the electrical interlock for operating the with the jack and ram connected to the height-adjustable rollers of the test device, and

6 shows an electrical circuit diagram for the cooling device and display device of the test device.

The test device is a fixed assembly with a 3asis 10 in the form of a frame, which in the operating position in a corresponding manner on the bottom surface of a Pit 11 is attached, which at the installation site of the test device is formed in the bottom 12. The fixed assembly also includes an upper frame 13 that extends over Stand 14a is supported on the base frame 10, runs along the circumference of the pit 11 and carries a bottom cover plate 14.

In the bottom cover plate 14 a substantially H-shaped recess is formed, the relatively wide partial openings 15a and 15b, which expose a roller arrangement, and has a relatively narrow connecting part 16, on which part of a lifting device is exposed.

The roller arrangement includes left and right height-adjustable or height-adjustable rollers 18a and 18b as well as left and right right fixed rollers 19a and 19 "b · The axes of rotation of the Roles 18a and 18b are like those of roles 19a and 19b Arranged in alignment with one another and are located in the longitudinal direction of a movement path 17 at a distance from the axes of rotation the rollers 19a and 19b. Each pair associated with each other Rollers 18a, 19a and 18b, 19b thus form a cradle or saddle, in which for balancing in most cases the Front wheels, possibly also the rear wheels of a vehicle are included.

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The height-adjustable .Rollen 10a and 18b are mounted in high plates in i? Orm of lifting members 20a, one of which in I ¹ Ig. Is drawn. "The lifting members 20 are pivotable about a .ichse 21a in the LIitte between the __chsen the aolle :, 13c. 1 and 9c., And is disposed below the same. Lie -IuIjglieder 20t, ciiid nit bearings 22a .aufgenommen.

The Hubglicd 20a points in the longitudinal direction erstr-ecJcenac: .-. Ahr.ientcile 2 ^? .a and 24a, which are connected to one another on opposite Andes. The valve parts 2-ia serve to support a, internal drive 25a, which is connected ir.it cer iloIIg 1 ^ :: ücer a i "le: cibele rlupplun ^ 26a. The, xiittriebsr.: Otors 25a only need to be dimensioned so strongly that they are capable of driving the relevant '.IcA ir.i before r.-Ihrzeu ^ vrev / iclit unloaded condition r.i with the naxinality of the! .-' ahrzeu ^ it.

In the lahr.ienteile 23a there are stores 27a for the column 1 vxvf g

Ler right height adjustable holle 18b are corresponding riahnenteile and a corresponding drive motor assigned.

An actuating device is used to raise the roller "16a 2öa in the form of a hydraulic jack or piston-cylinder unit. The associated cylinder engages with an EaIienteil 29 ^ a holder 30a on the base frame 10, while the piston rod facing away from the pivot axis 21a At the end of the i Lifting member 20a is connected.

the arrangement shown for the roller 19a, are the fixed lobes 19ε · and 19b with bearings 33a an ^ b st and s-ε tu eic en 34a added, aie attached to the base frame 10 are. The height of the axes of the fixed and adjustable in height Hollen 19a, 19b or I8a, 1öfc is chosen so

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that in the lower position of the liollen 18c. and 13b the am highest lying parts of the great 13a, l & b, 19s. and 19b little ran under the bottom cover plate 14. This condition however, it is not Icritical. The roles IBa, 1cb, 19a and 1Sb could through the corresponding partial opening 15c or 15b step out slightly upwards in the base cover plate 14.

In a eite between the iiollen 18a and 18b on one side and between the rollers 19a and 19b at the other ^ lying in the vertical direction extending portion, a belonging to the lifting device Fahrzeugaostütsung is in Ii ¹ orei a lifter 36 * of than in the transverse direction extending arm is formed and is provided with support plates 37a and 37b, which are each received on a rod 3oa and 38b, respectively. The rods 38a and 33b are guided telescopically displaceably in a central part 39 of the lifter 36 in the longitudinal direction. Thus, each support plate 37a or 37b can be brought under a corresponding part of the vehicle body or the vehicle chassis frame so that the vehicle can be raised to bring its wheels to be tested into a position at a distance above the floor cover plate 14 and thus relieve the load.

For upward adjustment of the lifter 36 is in its tiittenbereich a lift ram 40 is arranged.

The activation of the plungers for the lifting members 20a of the height-adjustable lobes 13a and 18b and the lifting plunger 40 is a hydraulic circuit, which in Pig. 5 shown is, the hydraulic line connections with simple solid lines, mechanical connections with solid double lines and electrical connections with dash-dotted lines are drawn.

A pump 41a, in the example shown, a hydraulic pump, is driven by an electric motor 41, the

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connected to terminals ΐ1, t2 and t3. The print side the pump 41a is connected to the pressure inlet via a pressure relief valve PHV1 Π or P2 of a valve V1, in the example shown, a Hollen control valve, or a valve V2 in the shown Example of a lifter control valve connected. The two valves V1 and V2 are solenoid operated. In Palle of the valve V1 is arranged by energizing a magnet 11 for the upper position of the left side or the left Rolls 13a, the actuating device 28a switched on, around the left cave 1δ, - ?. superscript. By excitement of one Magnet L2 for the upright position of the right side, the actuating device 28b for the right roller 18b is switched on, namely via a pressure relief valve PRV3. The outlets of all pressure relief valves are returned to a tank 42.

The valve V2 has a normal position in which between pressure and tank outlets P2, T2 and outlets A2, B2 no connection exists, so that the lift tappet 40 is held in the position it then assumes.

When a magnet L3, "AU; F ^{! I} " is excited, the lift tappet 40 is acted upon in a direction in which it raises the vehicle jack 36, while when a magnet L4, "AB" is excited, it is acted upon in one direction, in which he lowers the lifter 26.

To raise the left or right height-adjustable roller 18a or 18b before jacking up the vehicle with the To prevent the raising device, an electrical locking circuit is provided, which also allows lowering of the lifter 36 prevented as long as the left or the right roller 18a or 18b has not been adjusted downwards is.

The valve V2, which is under pressure when the lift tappet 40 is extended, is therefore connected to a switch S1 with its pressure outlet B2,

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In the example shown, a pressure switch connected, which can be operated by hand via two pairs of contact pieces Switches S3 and S4 is connected in series. The switches S3 and S4 are between input terminals t4 and t5, the are connected to a corresponding power supply, and the magnets L1 and L2 interposed.

By actuating the lifting ram 40 it is ensured that the lifting members 20a and 20b and the actuating devices 28a and 28b not to support the weight of the vehicle bro, uchen. The task of the actuating devices 28a and 28b is thus limited to the rollers 18a and 18b to the plant to bring to the wheels to be tested. The actuators 28a and 28b can therefore be large in diameter be kept smaller and lighter in construction than would otherwise be possible. The same applies to the lifting links 20a and 20b themselves.

The lifting members 20a and 20b for the rollers 18a and 18b are mechanically coupled with band switches S5 and S6 for the downward movement. The limit switches S5 and S6 are below each other and connected in series with the manually operated switches S3 and S4. The magnet L4, which is also connected to this circuit is connected, can therefore only be excited when both lifting members 20a and 20b or the associated actuating devices 28a and 28b are in the lower and retracted positions, respectively.

A manually operable switch S7 is used to control the excitation of the magnet L3.

At least, so that the vehicle can be driven off the platform under its own power after a test has been completed one, preferably both, rollers 18a and / or 19a or 18b and / or 19b, each forming a cradle or saddle The pair of rollers can be locked against rotation in the opposite direction to the direction of rotation of the test. As most clearly in Fig. 2

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can be seen with each of the relevant roles 18a, 18b, 19a and 19b can be connected to a unidirectional coupling, such as with the coupling 55a for the roller 18a, for example specified. One of the coupling parts would be held against rotation, while another coupling part with a Roller shaft 56a non-rotatably or in another corresponding V / eise would be firmly connected. The roller shaft 56a, for its part, is non-rotatable with the associated roller, in the example shown connected to the roller 18a.

The Vibration-s-Pühlvorrichtung is an aggregate to which a magnet holder 43 (Fig. 6) belongs to which by magnetic force on any part of the vehicle, for example left or right fender or any adjacent body or chassis frame part that is available to the operator is easily accessible, is kept. The magnet holder 43 carries a vibration transducer TD1. The unit is via a flexible cable 44 with the Input of a linear amplifier 46 connected. In the cable 44 a preamplifier 45 is connected, which is so close arranged as possible on the vibration transducer TD1 is, however, due to the flexibility of the cable 44 against the transmission of vibrations from the transducer TD1 is protected from.

The linear amplifier 46 has a rectifier in its output circuit and transmits a DC voltage signal to a comparison circuit 47 »the one with a further input is connected to a reference signal circuit 47a, in the example shown a reference voltage source. the Reference signal circuit 47a is changeable so that the amount the reference voltage can be changed and the level or the range of the signal values "GOOD" and "ERROR" can be set is.

The output of the comparison circuit 47 is a bistable Circuit 48 connected, which depends on the of the

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Comparison circuit 47 made evaluation, "GOOD" or "ERROR" is switched to either a low level (0) or a high level (1). The "bistable circuit 48 on your part controls the activation of the solid-state technology executed, i.e. transistorized switch current

49
circuit for the excitation or de-excitation of a relay RL.

One supplied by the BetzaB air supply terminals ti, t2 and t3 Engine starter switch circuit 50 has left and right Pushbuttons or other actuators with which the left motor 25a for the left height-adjustable Should 18a or the right motor 25b for the right, height-adjustable Bolle 18b be switched on. The Sehalterstromkrels 50 is kept closed until the motor in question, 25a or 25b, reaches its full speed Has. By releasing the push button or actuating element becomes the kotor, 25a or 25b, after reaching its full Speed switched off again. Simultaneously with this, a delay hold 51 is switched on, which after a predetermined delay time switches off to the switch circuit 49 to supply a voltage signal.

This voltage signal fed to the cable age circuit 49 causes the relay RL to be energized or de-energized, depending on the state of the bistable circuit 48, for example depending on whether "ERROR" is displayed if the unbalance is too great or "GOOD" is displayed if the predetermined level is not reached will. The relay has terminals for switching on a "GUliP-iiizeigegerätes ^ for example, a lamp, and a" GUOP printer 53 as well as connections to the case by case turn on an ⁿ FKHLER "displaying apparatus 54 and an" ERROR "-Drwskers 55.

The display devices 52 and 54 can be formed by lamps, the desk set up near the moving platform or in suitable i ^ llen are also arranged on a hand-held device, that the inspector uses when examining a particular vehicle.

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Instead of the output signal of the vibration transducer Using TD1 only to indicate "GOOD" or "FAIL" could be used to ground the flashing to control a stroboscopic lamp with which the wheel to be tested is illuminated, which is at a selected point its outer circumference would be marked accordingly with chalk or paint. By measuring the size of the imbalance indicating signal at the output of the versiärker 46 would result in information about the size of the balance weight to be attached, wherein the attachment for the balance weight according to known methods by the position is determined, which is taken by the stroboscopically illuminated mark.

In general, however, the device according to the invention is designed and intended for diagnostic purposes. An imbalance The pointing wheel would undergo further testing to determine the size and location of the counterweights.

/Expectations

509884/0451

Claims (7)

EXPECTATIONS Wheel imbalance testing device with a lane or platform for driving up and down the vehicle with his own wheels along a path of movement, at least one roller, which is arranged under the moving platform, but through an opening in the driving platform is exposed through it and for turning the vehicle wheel to be tested by a motor is drivable, a vibration sensing device that can be attached to the vehicle for scanning the wheel imbalance and outputting a electrical output signal, as well as with one with the Shock sensing device connected to circuit a display device for displaying the size of the unbalance, characterized by a lifter (36) for raising it at least the part of the vehicle which is close to the wheel to be tested in order to lift the wheel from the traveling platform and to be released for rotation, and by a lifting member (2Oa) to raise the associated motor-driven roller (18a) from a lower position to an upper position in order to drive the one in its upper release position the wheel to be tested to rest on the same. 2. Test device according to claim 1, characterized in that g e k e η η ζ e i without t that separate motor-driven rollers (I8a, i8b) on the left and right side of the test device are arranged, which are received on separate lifting members (20a, 20b) with separate actuating devices (28a, 28b) are. 3. Test device according to claim 1 or 2, characterized in that the lifter (36) has an arm which extends transversely to the movement path (17) and 509884/0451 / 2 46 in the longitudinal direction of the same between the height-adjustable and the associated fixed rollers (18a, 18b or 19a, 19b) is arranged. 4 · Test device according to claim 3 »characterized by g e k e η η, that on the arm laterally adjustable support plates (37a, 37b) are attached to the down pointing parts of the vehicle body or chassis frame can be brought to the system. 5. Test device according to one of claims 1 to 4, characterized in that the lifting member (20a) or each of the lifting members (20a, 20b) by an actuating tappet (28a or 28a, 28b) and the jack (36) by a lifting tappet (40) can be actuated, the plungers (28a, 28b, 40) being connected to a pressure fluid circuit with a pump (41a) and valves (V1, V2), which control the fluid delivery from the pump (41a) to the tappets (28a, 28b, 40), are connected, and a lock (switches S2, S5, S3, magnets L1, L4) belongs to the pressure fluid circuit, which ensures that the lift tappet (40) extends before raising the roller tappet or tappets (28a or 28a, 28b) and that the roller tappet or tappets Lower (28a or 28a, 28b) before retracting the lift tappet (40). 6. Test device according to claim 5, characterized in that g e k e η η, that with the roller tappet (28a) or with both roller tappets (28a, 28b) corresponding limit switches (S5 resp. S5, S6) are connected, which are operated in the lower position of the rollers (I8a, i8b) and the power supply of a Control the magnet (L4) that moves the lift control valve (V2) into a position for lowering the lift tappet (40), and that a switch (S1) is connected to the lift tappet (40), which supplies power to a magnet (L1) or two Magnets (L1, L2) controls which or which the roller control valve (V1) in a position or in positions to Raising the roller tappet (28a) or both roller tappets (28a, 28b) adjusted. 509884/0451 ^{/ 3} - i - 46 780 7. Test device according to one of claims 1 to 6, characterized in that the circuit (Pig. 6) connected to the vibration transducer (TD1) has a comparison circuit (47) which is obtained from the vibration transducer (TD1) The secondary signal developed by the input signal is compared with a reference signal from a reference signal circuit (47a) and, depending on this comparison, a "G-UT ⁱ¹ signal or a"]? EHLü!: Ei "signal for operating optical display devices (52,54) and / or Printers (53 »55) generated. 509884/0451 Blank