公开(公告)号：EP1931966B1

公开(公告)日：2018-11-28

申请号：EP06799567.0

申请日：2006-10-05

申请人： Olsen, Thor Wiggo

发明人： Olsen, Thor Wiggo

IPC分类号： G01N19/02

CPC分类号： G01N19/02 ,  G01N33/42

摘要： A device and method for measuring friction on a surface, such as a road, allow for accurate and reliable measurements by preventing the slipping of a pilot wheel. The device includes a pilot wheel and a measurement wheel mounted on shafts in a wheel box and arranged one behind the other, the pilot wheel rotating without slip and the measurement wheel being braked in order to provide slip. The configuration of the device, including the positioning of an attachment axle, results in the pilot wheel being subjected to greater ground pressure than the measurement wheel, thus preventing slipping of the pilot wheel.

公开(公告)号：EP1931966A4

公开(公告)日：2014-10-22

申请号：EP06799567

申请日：2006-10-05

申请人： OLSEN THOR WIGGO

发明人： OLSEN THOR WIGGO

IPC分类号： G01N19/02 ,  B60R20060101 ,  G01N33/42

CPC分类号： G01N19/02 ,  G01N33/42

摘要： A device and method for measuring friction on a surface, such as a road, allow for accurate and reliable measurements by preventing the slipping of a pilot wheel. The device includes a pilot wheel and a measurement wheel mounted on shafts in a wheel box and arranged one behind the other, the pilot wheel rotating without slip and the measurement wheel being braked in order to provide slip. The configuration of the device, including the positioning of an attachment axle, results in the pilot wheel being subjected to greater ground pressure than the measurement wheel, thus preventing slipping of the pilot wheel.

公开(公告)号：EP1931966A1

公开(公告)日：2008-06-18

申请号：EP06799567.0

申请日：2006-10-05

申请人： Olsen, Thor Wiggo

发明人： Olsen, Thor Wiggo

IPC分类号： G01N19/02

CPC分类号： G01N19/02 ,  G01N33/42

摘要： Friction against a road surface is measured by a friction measuring device that is pulled along behind a car. At the side of a main unit (6) of the friction measuring device there is a chain cover (5) with two wheels (3, 4). The wheels (3, 4) are interconnected by means of a chain (12) lying around sprocket wheels (10, 11) on the wheel axles. The sprocket wheels (10, 11) have different sizes, and therefore the two wheels (3, 4) will rotate with different rotation speeds. If for instance the forward wheel (3) rolls without slip during driving, the rear wheel (4) then must experience some slip, i.e. the rear wheel will skid on the road surface. Friction is measured by measuring the tension that arises in the chain (12). In order to ensure that the front wheel (3) will always rotate without slip, the chain cover (5) is attached to the main unit (6) by means of an attachment axle (9) that is placed substantially closer to the forward wheel (3) than the rear wheel (4). Due to this location of the attachment axle (9), the forward wheel (3) receives an increased ground pressure. The two wheels (3, 4) roll right behind each other in the same track which corresponds to one of the wheel tracks of the car.