DE8629052U1 - Device for determining position and shape deviations on cam disks - Google Patents

Description

Device for determining position and shape deviations on curve hoists

The invention relates to a device for determining position and shape deviations on cam disks, in particular for control cams on camshafts.

To measure cam discs in polar coordinates using a camshaft measuring device, the cam disc or cam shaft is held without impact between the centers of a dividing head and a tailstock. The cam disc is then scanned using a probe and the measured values obtained are assigned to the corresponding angular positions of the cam disc (Lehmann "Guide to Length Measurement Technology", VEB Verlag Technik Berlin, 1960, page 375).

Multi-point measuring devices with several probes are also used to measure the cam disks on camshafts. A "tester" is provided for each cam disk.

With the devices described, the radii of the curved disks and the contour can be determined in polar coordinates. Conicities of the lateral surfaces cannot be determined.

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However, with the device described in IE-OS 2651803 for measuring the roundness and conicity of the surface of rotation of a workpiece, it is only possible to test rotationally symmetrical parts.

The purpose of the invention is to eliminate the disadvantages of the prior art and to increase the measuring accuracy when testing curve sections and to reduce the measuring effort.

The invention is based on the object of creating a device for determining position and shape deviations on cam disks, which makes it possible to determine the radii and conicity of cam disks with high accuracy and with little technical effort and while avoiding double measurements.

According to the invention, this object is achieved in a device for determining position and shape deviations on cam disks, comprising a measuring probe which is slidably mounted in a holder and which touches the cam disk and is connected to measuring sensors which provide a measuring signal, in that a connecting piece is provided on the movable part of the measuring probe, on which a further measuring probe is arranged, which is connected to a further measuring system, and in that both measuring sensors are connected to a computer for determining and outputting the measured values.

It is advantageous if the connecting piece can be changed in its length.

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By applying the solution according to the invention, it is possible to measure both the radii of the cam disc, i.e. the shape of the cam disc, and the conicity of the cam disc's outer surface with great accuracy and in a short amount of time, whereby the conicity is characterized by the fact that the surface lines of the cam disc's outer surface do not run parallel to the axis of rotation. The device can also be used successfully to test rotationally symmetrical surfaces (dents) for roundness and stability (smoothness).

The invention will be explained in more detail below using an exemplary embodiment. The drawing shows a schematic top view of a device according to the invention.

On a measuring device 1, a measuring object 5» ^{, ζ} · ^β ·a camshaft, comprising a cam disk 4, is mounted in centers 2; 3 so as to be rotatable about an axis of rotation 6, the angle of rotation being adjustable with high precision, for example using a dividing device 7». A holder 9 is arranged on a guide 8 of the measuring device, which is adjustable in the longitudinal extent of the measuring object 5, and to which a measuring probe 10 is attached, which probes the cam disk 4 to be tested. A two-part connecting piece 12 is preferably provided on the movable part 11 of the measuring probe 10, on which a further measuring probe 13 is arranged. The movable part 11 of the measuring probe 10 is connected to a linear measuring device 14 and the movable part 15 of the measuring probe 13 is connected to a further linear measuring device 16. The measuring systems 14 and 16 generate measuring signals and are connected to a processing unit or to a computer 17 in which the signals of the measuring systems 14 and 16 are processed in such a way that the measured values are displayed on a display device 17 or

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can be printed out by a printer 18. The distance A of the movable parts 11 and 15» i.e. the length of the connecting pieceβ of the measuring sensors 10 and 13 can be adjusted by adjusting both elements of the connecting piece 12.

In the case of the device, the measuring probe 10 works as a reference probe, with the movable part 11 of the measuring probe 13 is rigidly connected. The measuring movement of its movable part 15 is a relative movement to the part 11 of the measuring probe 10.

From the measured values of the measuring probe 10, the radii of the cam disk 4 can be determined depending on the respective angular position of the measuring object 5. The measuring probe 13 arranged at a distance A from the measuring probe 10 provides difference values that characterize the shape and position of the outer surface in relation to the axis of rotation 6.

Claims (1)

S ohut zanaprüohe 1. Device for determining position and shape deviations of cam disks, comprising a measuring probe which is slidably mounted in a holder and which touches the cam disk and is connected to a measuring system which supplies a measuring signal, characterized in that a connecting piece is provided on the movable part of the measuring probe, on which a further ^measuring probe is arranged which is connected to a further measuring system. 2· Device according to claim 1, characterized in that the connecting piece is variable in its length· 9221