Scratch abrasion tester and testing method

1. A scratch abrasion tester, comprising:

a pair of pulleys;

an annular belt member stretched between the pair of pulleys;

a rubber sample fixed to an outer surface of the belt member;

a contact member with pointed tips that are able to come into contact with a surface of the rubber sample;

a pressing mechanism that presses the tips of the contact member against the surface of the rubber sample;

an anchor member for changing a pressing load applied by the contact member;

a shape sensor configured to detect a cross-sectional shape of the surface of the rubber sample; and

a calculation unit configured to obtain an amount of scratch abrasion of the rubber sample on the basis of detection data from the shape sensor;

a running speed of the rubber sample being variable,

the contact member including a plurality of types of contact members with different tip specifications,

the contact member that presses against the surface of the rubber sample being discretionarily selected from the plurality of types of contact members, and

the selected contact member being pressed against the surface of the rubber sample.

2. The scratch abrasion tester according to claim 1 , further comprising

a load sensor configured to successively detect the pressing load acting on the contact member and a load in a running direction of the rubber sample acting on the contact member.

3. The scratch abrasion tester according to claim 1 , further comprising

a temperature control mechanism configured to vary an external environment temperature of the rubber sample.

4. The scratch abrasion tester according to claim 1 , further comprising

a temperature sensor configured to detect a surface temperature of the rubber sample.

5. A scratch abrasion testing method in which an annular belt member with a rubber sample fixed to an outer surface thereof is stretched between a pair of pulleys and a contact member with pointed tips is pressed against a surface of the rubber sample by a pressing mechanism, the testing method comprising the steps of:

for testing,

setting a running speed of the rubber sample to a desired speed;

setting a pressing load applied by the contact member to a desired pressing load via an anchor member;

selecting, as the contact member, a desired contact member from a plurality of types of contact members with different rubber sample surface contacting tip specifications;

pressing the selected contact member against the surface of the rubber sample;

detecting a cross-sectional shape of the surface of the rubber sample using a shape sensor; and

obtaining an amount of scratch abrasion of the rubber sample using a calculation unit on the basis of detection data from the shape sensor.