Method and device for testing gearwheels

Patent metadata

Field	Value
Publication number	US-10371597-B2
Application number	US-201715681490-A
Country	US
Kind code	B2
Filing date	Aug 21, 2017
Priority date	Mar 13, 2015
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

A apparatus is provided for carrying out an optical test method for a gearwheel. The testing apparatus includes a first camera for capturing image data of a first type of tooth flanks of the gearwheel to be tested, a position sensor for determining a rotational position of the gearwheel to be tested, a control device for evaluating the rotational position determined by this position sensor and for controlling the camera on the basis of this turning position, and a first illuminating device designed for illuminating an area of the gearwheel to be tested, which area is provided for capturing the image data.

First claim

What is claimed is:

1. A test apparatus for carrying out an optical test method for a gearwheel, comprising:
a first camera that captures image data of a first type of tooth flanks of the gearwheel to be tested;
a position sensor that determines a rotational position of the gearwheel to be tested;
a control device that evaluates the rotational position determined by said position sensor and that activates the first camera based on said rotational position; and
a first illuminating device configured to illuminate a region of the gearwheel to be tested, which region is provided for capturing image data.

2. The apparatus as claimed in claim 1 , further comprising:
a second camera that captures image data of a second type of tooth flanks; and
a second illuminating device configured to illuminate a further region of the gearwheel to be tested, in that said further region for capturing image data is provided with the second camera.

3. The apparatus as claimed in claim 2 , wherein
at least one of the illuminating devices has an illuminating strength from a range that is greater than 200 000 lux and less than 1 000 000 lux.

4. The apparatus as claimed in claim 3 , wherein the range is greater than 550 000 lux and less than 650 000 lux.

5. The apparatus as claimed in claim 3 , wherein
at least one of the illuminating devices is arranged at an illuminating distance from the region on the gearwheel to be tested, for the illumination of which said illuminating distance is from a range which is greater than 10 mm and less than 750 mm.

6. The apparatus as claimed in claim 5 , wherein the range is greater than 125 mm and less than 250 mm.

7. The apparatus as claimed in claim 1 , wherein the position sensor operates according to a contactless measurement method.

8. The apparatus as claimed in claim 2 , wherein at least one of said first and second cameras has an exposure time which is selected from a range which is greater than 2 μs and less than 250 μs.

9. The apparatus as claim in claim 8 , wherein the range is greater than 70 μs and less than 120 μs.

10. The apparatus as claimed in claim 2 , wherein at least one of the first and second cameras is protected from the gearwheels with a protection device at least partially arranged between the gearwheels and the camera or the cameras.

11. The apparatus as claimed in claim 1 , wherein
the gearwheels are accommodate on two spindles arranged perpendicularly to each other, and
the apparatus is designed for testing bevel gearwheels or hypoid gearwheels.

12. A method for testing at least one gearwheel with a test apparatus designed for subjecting the gearwheels to a predeterminable test torque and for driving the gearwheels at a predeterminable test speed, the test apparatus having a camera-based test device for carrying out an optical test method in which image data can be captured and evaluated, the method comprising the steps of:
providing a gearwheel pair with two gearwheels;
accommodating the gearwheels on the test apparatus;
driving the gearwheels at a test speed;
recording a rotational position of the gearwheel to be tested by way of a position sensor;
evaluating said rotational position and activating at least one camera for capturing image data when the gearwheel to be tested is in a test rotational position; and
processing the captured image data with a first or second optical test method.

13. The method as claimed in claim 12 , wherein an illuminating device has a first and a second operating state, and
in the first operating state, the illuminating device emits light radiation for illuminating a region of the gearwheel to be tested, which region is provided for capturing image data,
in the second operating state, the illuminating device does not emit any such light radiation,
the illuminating device is set directly into the first operating state before image data from said region are captured, and
the illuminating device is set directly into the second operating state after the image data from said region are captured.

14. The method as claimed in claim 13 , wherein
before the second optical test method is carried out, a test medium layer is applied to at least a first type of the tooth flanks,
after this application, the gearwheel pair is driven at one test speed, and
in the process, the applied test medium layer is changed by contact of the gearwheels with each other, and
after or during said change, the camera for capturing image data is activated.

15. The method as claim in claim 14 , wherein
the testing medium layer is a contact pattern paint, and
the applied test medium layer is changed by being abraded.

16. The method as claimed in claim 14 , wherein the test medium layer is applied to tooth flanks of both types of tooth flanks of the gearwheel to be tested.

17. The method according to claim 16 , wherein the test medium layer is applied to all tooth flanks of said gearwheel.

18. The method as claimed in claim 9 , wherein
the gearwheels for the first test method are driven at the first test speed and in a first phase are subjected to a first positive test torque, and
image data of at least one leading flank of the gearwheel to be tested or of the two gearwheels are captured.

19. The method as claimed in claim 18 , wherein
during a second phase, the gearwheels are subjected to a second test torque which is directed counter to the first test torque, and
during the second phase, image data of at least one trailing flank of the gearwheel to be tested or of the two gearwheels are captured.

20. The method as claimed in claim 12 , wherein the gearwheels for the second test method are driven at the second test speed and in a first phase are subjected to a positive test torque which leads to an at least partial abrasion of the test medium layer on the first type of tooth flanks, in that image data of said type of tooth flanks are captured for evaluation when a virtually stationary state of the test medium layer has arisen, and
in a second phase of said test method, the gearwheels are subjected to a negative test torque which leads to an at least partial abrasion of the test medium layer on the second type of tooth flanks,
further image data of said type of tooth flanks are captured for evaluation when a virtually stationary state of said test medium layer has arisen.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Zhang Huchen
• Wildfeuer Anton
• Annast Rainer

Classifications

• G01N21/9515

  Objects of complex shape, e.g. examined with use of a surface follower device (measuring contours and curvatures G01B11/24) · CPC title

• G01M13/021 Primary

  Gearings · CPC title

• G06T7/0004

  Industrial image inspection · CPC title