32 results about "Tribometer" patented technology

An automated tribometer for measuring the coefficient of friction of the tread and gauge surfaces of railroad rail is disclosed. A tribometer is provided that is pushed in front of a high-rail vehicle, wherein during operation, the tribometer extends a rail test assembly to contact the surfaces of the rail. The rail test assembly has a rail testing wheel that is urged towards contact with the rail to be tested, and eventually contacts the rail, and lastly applies a known load to the rail. The testing wheel is then dynamically braked to slow the testing wheel to the point of creepage. The automated tribometer then can calculate the coefficient of friction of the rail.

Intrinsically calibrating friction mensuration device has a drive unit with controllable motive member, configured to receive a controllable propulsion force, and to apply tractive force to a test piece on a surface. A force engine couples to the motive member, and applies the controllable propulsion force. The device includes a controller imposing a propulsion control signal actuating the force engine to produce the propulsion force. A force sensor is between the drive unit and the test piece, producing a force signal responsive to a sensed force between the drive unit and the test piece. The drive unit can self-propelled or stationary. A method includes applying an increasing tractive force to a test piece at rest; measuring the tractive force; identifying the maximum tractive force applied at incipient motion; identifying the transition between the resting test piece and incipient motion; determining the SCOF; continue motion and determine the DCOF.

The invention relates to a method and a device that determine tribological measured values of samples (7, 8) with a rheometer (1). Wherein the measuring parts of the rheometer (1) are replaced by samples (7, 8) and the surfaces of the samples (7, 8) are moved into frictional contact relative to each other. Accordingly, it is provided that all parts of the rheometer (1) holding the samples (7, 8) in frictional connection and frictional contact or forming the rheometer power circuit, including the spring unit (3) pressing the samples (7, 8) against each other, are regarded as an oscillatory circuit. The oscillation properties of the spring unit are regarded as relevant to the oscillation properties of the oscillatory circuit (30), and that the oscillation properties of the spring unit (3) are adjusted taking into consideration the resonance oscillations or effects produced by changing, different measurement conditions expected with the respective measurement.

A testbench device for the analysis and/or optimisation of tribological properties in a piston ring/cylinder runway system, includes a cylinder segment-holding device for holding a cylinder runway segment as a testpiece, and a piston ring-holding device holding at least one piston ring element and capable of bringing the at least one piston ring element into bearing contact with the cylinder runway segment. An actuation device actuates the cylinder runway segment and/or the piston ring element such that relative displacement with respect to one another takes place in at least one defined direction of space, in particular in the form of an oscillating movement. The piston ring-holding device has a piston having a ring-shaped outer contour and with at least one circumferentially continuous piston ring groove, in which a piston ring is held as a piston ring element.

This invention is directed to a tribological apparatus and method incorporating a ball, a support, and means for maintaining a substantially constant force between the ball and a test surface. The ball rolls against the rotating test surface producing a wear track. Analysis relating to wear and fatigue can be performed on the test surface subsequent to producing the wear track.

The invention discloses a sample fixing device for a high temperature tribometer. The sample fixing device comprises a base and a plurality of fixing devices arranged on the base, wherein a plurality of fixing grooves and a plurality of fixing holes are symmetrically formed in the upper part of the base; a limiting groove is formed in each fixing groove; each fixing device is arranged on one fixing groove; each fixing device comprises a long nut, a V-shaped fixing part, a square fixing part and a large bolt; each V-shaped fixing part and the corresponding square fixing part are arranged on the corresponding long nut; each large bolt is arranged at the end part of the corresponding long nut; the plurality of V-shaped fixing parts are used for clamping circular samples; the fixing grooves and the limiting grooves are used for limiting the V-shaped fixing parts and the square fixing parts; each V-shaped fixing part consists of a fixing block, a connecting body and a limiting boss; each limiting boss is matched with the corresponding limiting groove; each connecting body is matched with the corresponding fixing groove. The sample fixing device disclosed by the invention is simple in operation and wide in application range; the experiment efficiency can be substantially improved.

A system for the calibration of a tribometer test foot utilizes a uniquely designed sanding pad with a hard-back sandpaper surface, and a separate, independent sander member which has a top section with a test foot mounting element in the form of a piston having a threaded connection for securing the test foot. The sander member, with test foot attached, is configured to mate with the sanding pad to allow the test foot to be sanded to the required calibration. Calibration of the test foot is accomplished by pressing the sander member onto the sanding pad such that the test foot is compelled against the sandpaper surface of the sanding pad and rotating the sander member for the requisite sanding and thus accurate calibration of the test foot.

This invention is directed to a tribological apparatus and method incorporating a ball, a support, and means for maintaining a substantially constant force between the ball and a test surface. The ball rolls against the rotating test surface producing a wear track. Analysis relating to wear and fatigue can be performed on the test surface subsequent to producing the wear track.

A method for abrasion testing of a material sample includes abrading a surface of the sample with a tribometer, then characterizing particles in a portion of the flowing air that is received in an airborne particle collector. The testing may be done in an enclosure or container, such as an enclosure in or simulating a clean room environment. The drawing of air into the enclosure may be done by a fan pushing in air through a filter, such as a high efficiency particulate air (HEPA) filter. The enclosure may have vents (or louvers) through which some of the outflow of air may be directed, to help maintain an even flow, for example a laminar flow, of air through the container, and in particular past where the tribometer abrades the test material. The method may allow for real-time characterization of the particles produced by the testing.

In one embodiment, a tribometer comprises: an infrared (IR) transparent and optically transparent disk coupled to a platform, the disk having an observation side disk surface on an observation side of the disk and a contact side disk surface on a contact side of the disk; a motor coupled to the disk to rotate the disk around a rotational axis of the disk; a pivot support coupled to the platform; a pivoting member connected to the pivot support to pivot along a pivot plane; a sample holder configured to hold a sample and be coupled with the pivoting member to place the sample in contact with the contact side disk surface of the disk; and an IR camera and an optical microscope disposed on the observation side of the disk to observe the sample in sliding contact with the contact side disk surface of the disk driven in rotation.

The present invention relates, in part, to systems for characterizing force (e.g., friction, and wear). In one embodiment, a tribometer allows for wear testing of samples in a high throughput manner.