A chassis dynamometer for motorcycles with a combustion engine, having a mounting unit, at least one fastening unit, an operating unit, a control unit and a roller for recording the peripheral speed of a motorcycle rear wheel is disclosed. The chassis dynamometer has a flow unit a drive unit, a diffuser and an outflow unit arranged downstream of the diffuser in the direction of flow where the diffuser and outflow unit form a flow channel carrying gas in the operating state, wherein the diffuser can be driven by the drive unit, where the control unit controls the drive unit as a function of the peripheral speed of the roller in such a way that a speed of the gas emerging from the outflow unit in the operating state is substantially equal to the peripheral speed at least from a peripheral speed of 150 km/h.

In a tire uniformity testing apparatus which measures uniformity of a tire by measuring a load applied to the tire pressed against a rotary drum, a load estimation model is generated which is used to control a pressing position of the rotary drum, and generates a load estimation model indicating a relation between the pressing position of the tire with respect to the rotary drum and the load applied to the tire. The load estimation model is generated by: holding the tire in which uniformity has already been measured for each characteristic value; acquiring a nominal model depending on the characteristic value of the tire; and generating based on the acquired nominal model.

The calibration method for a multi-component force detector is a calibration method for a multi-component force detector provided in a rolling resistance testing machine comprising a spindle to which a tire is mounted, and a traveling drum having a simulated traveling road surface against which the tire is pressed, wherein when processing for calculating force acting on the tire from the measurement value of the multi-component force detector using a crosstalk correction factor for correcting the influence of crosstalk occurring in the multi-component force detector is performed, a test is conducted using at least one or more reference tire the rolling resistance value of which is already known, and the crosstalk correction factor is calibrated using “rolling test data” composed of force measured by the multi-component force detector during the test using the reference tire, and the rolling resistance value of the reference tire used for the measurement.

A method of testing a tire is employed in an enclosed system having a drum enclosure connected to a tire enclosure by flexible bellows, the enclosed system configured such that a tire inside the tire enclosure abuts a drum inside the drum enclosure. The method includes rotating the drum at a first angular velocity, thereby causing the tire to rotate at the first angular velocity. The method further includes measuring a temperature at a first location adjacent the tire and blowing cool air into the tire enclosure when the measured temperature exceeds a predetermined temperature threshold. The method also includes measuring a humidity level at a second location and adding moisture in the tire enclosure when the measured humidity level falls below a predetermined humidity threshold.

A tire uniformity testing apparatus (1) measures uniformity of a tire (T) by measuring a load generated on the tire (T) pressed against a rotating rotary drum (2). A load model used to control a pressing position of the rotary drum (2) and express a relation between the pressing position of the tire (T) against the rotary drum (2) and a tire load generated in the tire (T) is configured to successively measure the tire load, while changing the pressing position of the tire (T) against the rotary drum (2), and to estimate the tire load using the measured value of the measured tire load.

A method for providing a visual aid to guide a driver when executing a test cycle includes controlling an electronic display to display a graph including a target trace indicating a target speed of a vehicle during the test cycle and a first visual indicator of an actual speed of the vehicle during the test cycle, scroll the target trace from a first side of the graph to a second side of the graph during a time-based portion of the test cycle to indicate the target vehicle speed with respect to an amount of time elapsed since a start of the test cycle, and scroll the target trace from the first side of the graph to the second side of the graph during a distance-based portion of the test cycle to indicate the target vehicle speed with respect to a distance travelled by the vehicle during the test cycle.

A rotating body load measuring device (100) according to the present invention detects a force acting on a rotating body (30) that is formed in a columnar shape and rotates around a central axis (L60) of a shaft body (60) protruding from a center of an end face, in a state where a main load is applied to the rotating body (30) in a main load direction (P) that is one direction in a radial direction, and includes a load cell (70) having a measurement center (C70) and capable of measuring forces acting in at least three directions with the measurement center (C70) as a reference, in which the load cell (70) is disposed such that the measurement center (C70) and the central axis (L60) overlap when viewed in the main load direction (P), and is connected to the shaft body (60).

A tire testing machine includes a tire and wheel assembly having a sensor configured to measure a parameter related to the tire and wheel assembly as it rotates on a rotating element. A holder supports the tire and wheel assembly. A processor is configured to receive an input at least based on the output signal from the sensor, and provide an output signal indicative of a parameter of a contact patch between a tire of the tire and wheel assembly and the rotating element. Controlled element(s) are configured to vary a parameter related to the contact patch and/or friction.

Described is a device for locking a rim of a wheel to a wheel-holder unit (4) equipped with a supporting plate (12) and a hollow rotary shaft having an end portion projecting in a cantilever fashion from the supporting plate (12), comprising: a centring cone (16) having a through hole; a clamping rod (11) having at a first end a clamping element (10) which can be inserted inside the hollow shaft to prevent a movement of the clamping rod (11) along a first axis (A) of the wheel-holder unit (4), and having at a second end a threaded portion; a clamping element (17) coupled to the threaded portion and which can be rotated for translating along an axis of the clamping rod; a centring flange (23) operatively interposed between the centring cone (16) and the clamping element (17). The first end of the clamping rod (11) is operatively inserted in a hole of the centring flange (23), with the same direction as that in which centring rods (23b) of the centring flange project, and in the hole of the centring cone (16), with the opposite direction to that along which the centring cone (16) is tapered.

A tire uniformity tester having: a spindle capable of rotating while holding a tire; a drum; a pressing mechanism that rotatably supports the drum and makes it possible to press a tire attached to the spindle into the drum through the relative movement of the drum and spindle; a uniformity measurement unit for measuring the uniformity of the tire during forward rotation and reverse rotation; and a control device. The control device controls the driving of the rotation of the spindle and the relative positions of the spindle and drum so that when the rotation direction of the spindle is reversed, the spindle and drum are separated from each other such that the spindle rotation speed reaches zero in a state in which the outer peripheral surface of the drum and the tire tread surface are not in contact with each other.