DE9012625U1 - Rotating base for electronic wheel alignment devices - Google Patents

Description

Description Rotating base for electronic wheel alignment devices

The invention relates to a rotary base for accommodating steerable vehicle wheels resting on a measuring base, with a base plate on which a rotary plate is rotatably mounted and provided with a rotary angle sensor with a drive with double gearing in a housing, which is completely protected under the base plate, mounted in a bearing device in the coordinate system, is movable and guided without play and ensures a high angular resolution.

Rotating bases of the type described above are known, the drive for the rotary encoder is without or with a very low gear ratio, since the space in the area of the rotating base is very limited due to the movement in the coordinate system.

The innovation is therefore based on the task of designing a rotary base of the type described above in such a way that a very high angular resolution and thus a very precise measurement of the wheel turning angle is possible and the device, despite its design, does not require any major

Dimensions are required and thus the generally established installation dimensions in the measuring stands are met.

This task is solved according to the innovation by the features specified in the characterizing part of claim 1. The rotary base proposed according to the innovation has a closed gear for angle measurement, which includes a double gear ratio of at least 1:30 and an incremental measuring system, with the bearing points of the gear ratios being arranged symmetrically in front of and behind the driving rotary axis. The gear can thus be designed symmetrically to the driving rotary axis and to the bearing pin of the rotary plate and enables uniform displacement in all directions of the coordinate system in the H-shaped bearing device. The play-free guidance of the gear in the H-shaped bearing device and its guidance in the base plate is carried out by spring-loaded sliding pieces. The mobility of the rotary plate in the coordinate system is limited by the arranged bearing pin, which reaches through the hole in the base plate.

Further features, details and advantages of the innovation emerge from the following description of preferred embodiments based on the drawings

Shown here:

Fig.l a longitudinal section through a rotating base according to the innovation.

Fig. 2 is a bottom view of the rotary sub-assembly shown in Fig. 1.

Fig. 3 a top view of the gearbox with over-

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As can be seen from Fig. 1, the load of a vehicle wheel (not shown) which acts on the rotating plate 5 of the rotating base 1 is transferred to the base plate 19 via the central balls 18. The ball cage 20 guides the balls 18 at a constant distance. The rotating plate S is firmly connected to the gear 3 via a screw 21 through the rotation axis 11, so that it can move together with the latter in the direction of the arrow 7 (Fig. 2), with the rotational movement also being carried out by the rotation axis 11.

The details of the bearing device 6 and its guides are shown in Fig. 2. The spring-loaded sliding blocks 22 guide the bearing device 6 without play and maintain this condition even when the components wear out. The handles 23 make it easier to transport and handle the rotating base.

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The gear 3, shown without a cover, has the hollow rotary axis 11 (Fig.3) in the middle, which is firmly connected to the drive pulley 14 and moves the drive pulley 15 via the belt 24. The transmission then takes place through the small drive pulley 15 via the drive pulley 16, which is firmly connected to it, to the small drive pulley 17 by means of a belt 25. The drive pulley 17, which is rotatably mounted, is firmly connected to a pulse disk 26, which is scanned by a light barrier 27, the signals from which are fed to an electronic unit (not shown) for evaluation. The sliding blocks 9 located on the side 8 are supported by a compression spring 29 and thus guide the gear in the bearing device 6 without play, whereby the opposite sliding blocks 28 are firmly mounted, all sliding blocks have good sliding properties and are wear-resistant.

Claims (6)

Il t Il |t Il &tgr;♦ » I · I I · I I · I · »111 If ··»·· ■« !■ A.RohS GmbH Aschaffenburgerstraße 48 Schöllkrippen 3 September 1990 Dteh base for electronic wheel alignment devices Protection claims 1. Rotating base for electronic axle measuring devices for holding steerable wheels to be aligned on a measuring base with a base plate on which a rotating plate is rotatably mounted and is movably guided in a coordinate system with a support rail in a bearing device, characterized in that the drive of the angle of rotation sensor (2) is designed as a closed gear (3) and its operating position is determined by the connection of the bearing pin (4) of the rotating plate (5) to the axis of rotation (11). 2. Rotating base according to claim 1, characterized in that the gear (3) is guided in the bearing device (6) without play and is provided therein to be freely movable in the direction of the arrow (7). 3. Rotating base according to claim 2, characterized characterized in that the gear (3) has two spring-loaded sliding blocks (9) on one longitudinal side (8). 4. Rotating base according to claims 1 to 3, characterized in that the bearing pin (4) is firmly connected to the rotation axis (11) by engaging through the bore (10) and at the same time 2.U the edge of the bore (10) forms the limit stop for the movement of the rotary plate (5) in the coordinate system. 5. Turning belt set according to claim 1 to 4, characterized characterized in that the gear (3) has a double transmission (12,13), the drive pulleys (14,15, 16,17) of which are synchronous belt pulleys. 6. Rotating base according to claims 1 to 5, characterized in that the drive disks (14,15, 16,17) are arranged at the same distance in front of and behind the axis of rotation (11).