91 results about "Static friction coefficient" patented technology

The invention relates to a powder metallurgy copper-based friction material for a large-displacement motorcycle and a preparation method of the powder metallurgy copper-based friction material, and belongs to the technical field of preparation of powder metallurgy copper-based friction materials. The surface Rockwell hardness HR15N of the powder metallurgy copper-based friction material is 50-70, the dynamic friction coefficient can reach 0.7 or above, the static friction coefficient is 0.8 or above, the wear rate is smaller than 1 * 10 <-7 > cm / (N.m), and the dynamic friction coefficient wave is smaller than 0.02. The brake can be applied to large-displacement motorcycle brakes. According to the preparation method of the powder metallurgy copper-based friction material for the large-displacement motorcycle, a pressure-free continuous sintering process is adopted, the raw materials are evenly mixed for 1-6 h according to the formula, then the mixture is pressed into a blank, high-temperature sintering is conducted in the reducing atmosphere, then machining forming is conducted, and the powder metallurgy copper-based friction material for the large-displacement motorcycle is obtained.

The invention discloses a slow-start pneumatic switch valve device for trichlorosilane feeding, and belongs to the technical field of material preparation process valves. Comprising a switch valve and a pneumatic actuator, linear motion of a piston rod is converted into rotation fine adjustment through a swing arm rotation compensation mechanism, a solid / microgroove sealing ring and a sliding cavity wall are always kept on a theoretical contact line, abrasion microgaps are automatically compensated, zero-clearance sliding in the whole life cycle is achieved, and manual clearance adjustment is avoided; the solid sealing ring adopts surface-surface contact, so that the unit pressure is reduced by more than 50%, and the wear rate is obviously reduced; the omega-shaped groove of the microgroove sealing ring converts solid particles (10-50 microns Si) into groove edge elastic sealing, and the wear rate is reduced by 40% again; a sealing surface is provided with a uniform oil film, the dynamic and static friction coefficient difference is reduced, crawling / jumping in a 0-20% opening low-speed stage is eliminated, true slow starting is achieved, the water hammer effect during trichlorosilane feeding is avoided, the sealing surface is provided with the uniform oil film, the dynamic and static friction coefficient difference is reduced, and crawling / jumping in the 0-20% opening low-speed stage is eliminated.

This application discloses an intelligent friction coefficient measurement system, method, electronic device, and storage medium, relating to the field of friction coefficient measurement. The system includes an intelligent traction trolley, a detection block of known weight, a traction rope, a tension sensor, and an image acquisition device. The intelligent traction trolley includes a vehicle body, a main control module, a drive motor, and a human-machine interface module. The intelligent traction trolley moves at a constant speed via the drive motor, causing the detection block to move synchronously. The tension sensor measures the tension in real time, and the image acquisition device acquires images of the target to determine the spatial attitude parameters of the traction rope. The main control module calculates the actual effective tension based on the spatial attitude parameters and the tension signal, and then calculates and displays the maximum static and dynamic friction coefficients in conjunction with the weight of the detection block. This solves the problems of insufficient measurement accuracy, poor operational stability, and errors caused by the attitude of the traction rope in existing technologies, achieving automated, high-precision intelligent measurement.

The present invention provides a fixing device capable of suppressing the displacement of a sliding member that comes into contact with a rotating fixing belt at the fixing nip section. [Solution] The fixing device 8 comprises a fixing belt 81, a sliding member 85, a nip forming member 84, and a pressure roller 82. The sliding member 85 is sheet-shaped and is positioned adjacent to the radially inner side of the fixing belt 81, with the inner circumferential surface of the rotating fixing belt 81 sliding into contact with it. The nip forming member 84 is positioned radially inner of the fixing belt 81, with the sliding member 85 sandwiched between it and the inner circumferential surface of the fixing belt 81. The static friction coefficient between the sliding member 85 and the nip forming member 84 is 0.3 or more.

To provide heat-sealable paper that reduces environmental impact, is easy to open, and is resistant to tearing during opening, as well as rolls, packaging bags, and packaging bodies made using the heat-sealable paper. [Solution] A heat-sealable paper having a heat-seal layer on one side of a paper substrate, wherein the paper substrate content in the heat-sealable paper is 50% by mass or more, and the geometric mean of the pure bending stiffness in the longitudinal direction and the pure bending stiffness in the transverse direction of the heat-sealable paper is 0.80 g·cm 2 A heat-sealable paper having a length of 1.8 kN / m or less, a longitudinal tensile strength of 1.8 kN / m or more, and a static friction coefficient of 0.750 or less on the side of the heat-sealable layer opposite to the paper substrate.

The application is suitable for the technical field of machine tool combination assembly, and provides a micro contact joint surface static friction coefficient calculation method, which comprises the following steps: obtaining joint surface characteristic parameters; based on fractal theory and elastic theory, constructing base additional deformation and micro convex body normal deformation equation, through micro stress analysis, establishing single micro convex body deformation geometric parameters; considering three deformation stages of micro convex body, obtaining joint surface contact area and contact load; using modified island distribution function to integrate joint surface real contact area and contact load in different deformation stages, obtaining joint surface real contact area and contact load; considering the influence of static friction coefficient on contact surface characteristics, establishing joint surface static friction coefficient model. The application establishes surface static friction coefficient model from the micro contact angle, and simultaneously considers the interaction of micro convex body and base and three stages of material elastic, elastic-plastic and complete plastic deformation.

An item of protective apparel comprising: first and second components (41, 42) that are configured to move relative to one another; and a sliding interface provided between the first and second components; wherein the sliding interface comprises first and second surfaces (41, 42) that oppose one another and are configured to slide relative to each other; the first surface has at least a first region (45) which is divided into at least first and second areas (47, 48) that are configured such that at least one of the static coefficient of friction and the dynamic coefficient of friction for the first area against the second surface is different from the second area against the second surface; the first surface has a second region configured such that the static and / or dynamic coefficient of friction of the first surface against the second surface is different in the first region from the second region (46); the second region is divided into at least first and second areas (49, 50) that are configured such that at least one of the static coefficient of friction and the dynamic coefficient of friction for the first area against the second surface is different from the second area against the second surface; and the arrangement of the first and second areas in the first region is different from the arrangement of the first and second areas in the second region.

A fiber for hair having a base fiber and an oil component present on at least a portion of the surface of the base fiber, the fiber for hair having a dynamic friction coefficient [mu] k of 0.25 or more and a difference [mu] s-[mu] k between a static friction coefficient [mu] s and the dynamic friction coefficient [mu] k of 0-0.05.

This utility model discloses an anti-slip knitted fabric, relating to fabric technology. The key technical points are: it includes a surface layer and a bottom layer; the bottom layer has several pleats; the surface layer has raised strips; and the bottom layer has anti-slip strips. The anti-slip strips increase the maximum static friction between the bottom layer and the mattress, reducing the possibility of relative sliding. The pleats, by changing the surface roughness of the bottom layer, also increase the maximum static friction coefficient between the bottom layer and the mattress, further reducing the possibility of relative sliding. The use of GB1 and GB2 combed yarns, made from modal fibers twisted together, ensures the moisture absorption capacity of the surface layer, guaranteeing its comfort.

The utility model discloses an engineering seat anti-skid wear-resistant seat surface material, which comprises an anti-skid layer, an enhancement layer, a shock absorption layer and an absorption layer, the upper surface of the anti-skid layer is provided with a bionic shark layer structure, the shock absorption layer is internally provided with a plurality of elastic pieces, the shock absorption layer is internally filled with magnetorheological fluid, the absorption layer is internally provided with a silica gel honeycomb block, and the silica gel honeycomb block is filled with a plurality of elastic pieces. A reinforcing band is arranged in the absorbing layer, and the reinforcing band is filled with polyurethane foam. According to the device, the stability of the static friction coefficient is improved by arranging the bionic shark layer structure, the surface is durable and wear-resistant, scratches and fuzzing are reduced, and by means of hexagonal elastic deformation when the silica gel honeycomb block is pressed, the viscosity of magnetorheological fluid, damping vibration of polyurethane foam in the reinforcing band through a closed-cell structure, elastic deformation of an elastic piece and deformation of an air capsule, the stability of the static friction coefficient is improved. A multi-stage damping mechanism is formed to absorb vibration, local pressure can be dispersed to the whole absorption layer, and the excellent compression resilience performance is achieved.

The invention relates to the technical field of friction coefficient testing, and provides a metal material high-temperature friction coefficient testing device which comprises a motion control system, a motion platform assembly, a heating system and a measuring system. The test piece made of a metal material and the sliding block are arranged on the motion platform assembly, and the sliding block is placed on the test piece; the heating system is used for heating and preserving heat of a test piece and a sliding block which are arranged on the motion platform assembly; the motion control system drives the motion platform assembly to drive the test piece to slide, so that the test piece slides relative to the sliding block; when the test piece and the sliding block slide relatively, the measuring system monitors data of force generated by the sliding block in real time through the force sensor, records a time-domain curve of the data and calculates the friction coefficient according to the time-domain curve. According to the scheme of the invention, the method can meet the temperature requirement of a metal material use environment, and can measure the static friction coefficient and the dynamic friction coefficient of the metal material in a high-temperature state.

The application discloses a robot friction parameter identification method and device, a terminal and a medium. The method comprises the following steps: acquiring a dynamic speed threshold of a robot joint; identifying a static friction coefficient, a coulomb friction coefficient and a critical speed in a low-speed section where the speed of the robot joint is lower than the dynamic speed threshold; and identifying a viscous friction coefficient in a medium-high speed section where the speed of the robot joint is higher than the dynamic speed threshold, in combination with the obtained static friction coefficient, the coulomb friction coefficient and the critical speed. The application has the advantage that higher-precision robot friction parameters can be obtained, thereby facilitating the construction of a high-precision robot friction model.

This invention provides a safety verification method for clamping battery cell modules into a box. The safety verification method includes the following steps: Step 1, determining the clamping force F of the clamp. 夹 A static friction test bench was built, and the static friction between the urethane block and the blue film was tested and analyzed on the test bench to determine the clamping force F of the fixture. 夹 Step 2: Determine the cumulative relative displacement ΔL of the battery cells in the module in the Z direction. 总 This safety verification method determines the minimum reliable clamping force in the Y direction by studying the static friction coefficient of the clamp on the side of the module; and determines the maximum cumulative relative displacement of the battery cell in the Z direction by studying the deformation curve of the relationship between ΔLmax and τ of the double-sided adhesive foam. This provides data support for the design of the module clamping and boxing tooling, ensuring the reliability of the clamp for module handling when the battery cell module is clamped and boxed.

To provide building material components that have a desirable tactile feel. [Solution] A building material component having a coating film formed on at least a part of its surface, wherein the coating film has an arithmetic mean surface roughness Ra of 1.0 or more and 8.5 μm or less, a maximum surface height roughness Rz of 6.0 or more and 45.0 μm or less, a static friction coefficient of 0.81 or more and 0.92 or less, and a dynamic friction coefficient of 0.36 or more and 0.46 or less.

Provided is a multifilament in which: modified cross-section fibers having different cross-sectional shapes are dispersed and mixed; the fibers have 3 to 20 recesses continuous in a fiber axis direction; and the ratio of the maximum depth of the recesses between the fibers is 1.1 to 5.0. The multifilament is configured so that: composite fibers having different composite cross-sections are dispersed and mixed; the fibers are composed of a hardly-eluting component and an easily-eluting component; the hardly-eluting component of the fibers has 3 to 20 recesses continuous in a fiber axis direction; and a ratio of the maximum depth of the recesses of the hardly-eluting component between the fibers is 1.1 to 5.0. Further provided is a woven / knit fabric comprising a multifilament in which modified cross-section fibers having different cross-sectional shapes are dispersed and mixed, said fabric having a static friction coefficient of a fabric surface of 0.5 to 2.0, and a variation of a dynamic friction coefficient of 1.0×10-2 to 5.0×10-2.　Provided are the multifilament, the woven / knit fabric, and a fiber product which are suitable for comfortable clothing, in which patches of unevenness can be formed on the fabric surface and patches of voids can be formed inside the fabric, which have a mild gloss with a squeaky and luxurious feeling peculiar to silk, and which also have functionality such as water absorbing and diffusing properties.

Provided is a composite semipermeable membrane including: a support membrane; a separation functional layer containing a crosslinked polyamide disposed on the support membrane; and a coating layer disposed on the separation functional layer, in which a developed area ratio Sdr of a coating layer-side surface of the composite semipermeable membrane is 60% to 200%, and a static friction coefficient us between the coating layer-side surface of the composite semipermeable membrane and a lapping film abrasive having a particle size of #2000 is 0.40 to 1.30.

The present application provides a laminate capable of achieving excellent slidability regardless of whether or not a user's finger is wetted with water, an optical member with the laminate, and an image display device. The laminate of the embodiment of the present application has a substrate and a functional layer disposed on one side in the thickness direction of the substrate, and the static friction coefficient and the kinetic friction coefficient of the functional layer surface measured using a contact wetted with water are both 0.13 or less in a specific friction test based on a Bowden method of surface contact.

In order to provide a protective garment having excellent oil resistance, dust resistance, comfort, and productivity, this protective garment is provided with a first fabric having a first surface and a second surface, a second fabric having a third surface and a fourth surface, and a joining section that joins the first fabric and the second fabric. The ratio of the static friction coefficient of the second surface of the first fabric to the static friction coefficient of the fourth surface of the second fabric is 0.80-1.20, the first surface of the first fabric is formed by a resin layer which is arranged on the opposite side of the human body side when the protective clothing is worn, and the second surface of the first fabric, the third surface of the second fabric and the fourth surface of the second fabric are formed by fiber layers which are arranged on the opposite side of the human body side when the protective clothing is worn. The first fabric and the second fabric are joined by means of at least one member selected from the group consisting of sewing threads, welding, and an adhesive, and the first surface of the first fabric and the third surface of the second fabric are disposed facing each other at the joining portion.

An object of the present disclosure is to provide a grip rubber composition from which a crosslinked rubber having a great static frictional coefficient can be obtained. The present disclosure provides a grip rubber composition containing a base rubber, hard porous carbon particles and a vulcanizing agent, wherein at least one part of the hard porous carbon particle is composed of a glassy carbon, and an amount of the hard porous carbon particles ranges from 1.5 mass % to 8.5 mass % in 100 mass % of the rubber composition.

A foaming adhesive sheet comprising a substrate and an adhesive layer placed on at least one surface side of the substrate; wherein the adhesive layer includes a curable adhesive, and a forming agent; the adhesive layer is placed on an outermost surface; a pressure-sensitive adhesive force of the adhesive layer is 0 N / 25 mm or more and 0.1 N / 25 mm or less; a static friction coefficient of a surface of the adhesive layer opposite to the substrate is 0.30 or less; and a pencil hardness of a surface of the adhesive layer opposite to the substrate is F or more.

This invention relates to the field of interfacial friction testing technology for particulate materials, and provides a device and method for measuring the static and dynamic friction coefficients of irregular particulate materials. The method includes: obtaining static and dynamic friction forces based on the effective friction torque, the time interval during which the tip of the Reuleaux triangular grinding ring sweeps against the bottom of the square constraint cavity, and the stable time interval during which the long arc end of the Reuleaux triangular grinding ring sweeps against the bottom of the square constraint cavity, and then obtaining the static and dynamic friction coefficients. The device and method of this invention should be able to simulate the compaction, embedding, sweeping, and restarting processes of particulate materials within a confined gap, obtaining static, dynamic, static, and dynamic friction forces, and the static and dynamic friction coefficients within the same particle placement state and the same test cycle. It also possesses multi-condition testing capabilities, including atmospheric pressure without liquid, atmospheric pressure with liquid or drilling fluid, and vacuum without liquid, thereby providing a basis for evaluating the anti-slip ability, anti-migration ability, environmental sensitivity, and wellbore reinforcement suitability of particulate materials.

To provide a foaming adhesive sheet that can be used in gaps of members or between members and has excellent insertability and adhesiveness.SOLUTION: A foaming adhesive sheet comprising a base material and an adhesive layer disposed on at least one surface side of the base material, in which the adhesive layer contains a curable adhesive agent and a foaming agent, the adhesive layer is disposed on a topmost layer, the adhesive layer has an adhesive force of 0 N / 25 mm or more and 0.1 N / 25 mm or less, a static friction coefficient of a surface of the adhesive layer opposite to the base material is 0.30 or less, and a pencil hardness of the surface of the adhesive layer opposite to the base material is F or more.SELECTED DRAWING: Figure 1

The invention relates to an automobile braking stability control method considering random parameters, a system thereof and an automobile in the technical field of automobile braking. The method comprises the steps that when an automobile is braked and the frequency ratio of automobile braking angular velocity response is larger than or equal to a calibrated threshold value, target braking pressure FN0 is calculated according to the wheel angular velocity omega0 at the initial time of automobile braking, and the target braking pressure FN0 is output to a brake block through a braking pressure regulator. C is torsional damping of the brake disc, D is Gaussian white noise, kappa 1 is 1.5 (mu s-mu m) / vm, kappa 3 is 0.5 (mu s-mu m) / vm < 3 >, mu s, mu m, vm and k are static friction coefficient, sliding friction coefficient, sliding angular velocity and torsional rigidity of the brake disc respectively, rho1 is random control parameter of k, and R is equivalent action radius of a brake block acting on the brake disc. According to the method, the technical problem that the automobile brake chatter control effect is poor due to the fact that the brake chatter stability boundary is difficult to obtain due to the fact that the brake disc rigidity parameter has remarkable uncertainty is solved, and effective suppression of automobile brake chatter is achieved.

An individually-wrapped absorbent article includes a wrapping sheet including paper, and an absorbent article individually wrapped with the wrapping sheet. Printing is provided on an exposed surface of the wrapping sheet, which is exposed when the wrapping sheet individually wraps the absorbent article. The exposed surface has MMD of 0.050 or less before printing, and the exposed surface after the printing has a coefficient of static friction of 0.60 or greater against an exposed surface of another individually-wrapped absorbent article.

A fixing device includes a fixing belt, a sliding member, a nip forming member, and a pressing member. The sliding member is sheet-form and is disposed radially inward of the fixing belt to be adjacent to it such that the inner circumferential surface of the rotating fixing belt makes contact with, while sliding across, the sliding member. The nip forming member is disposed radially inward of the fixing belt, across the sliding member from the inner circumferential surface of the fixing belt. The coefficient of static friction between the sliding member and the nip forming member is 0.3 or more.

This invention provides an electronic component mounting substrate and an electronic device. The electronic component mounting substrate has excellent adhesion and damage resistance, and is provided with an anti-peeling layer that increases the smoothness of the corners of the components after processing, and firmly covers the substrate and the electronic components on the substrate. This prevents the electronic components from being hooked onto the mounted electronic components by fingernails or other parts during the mounting process, thereby preventing the electronic components from peeling off the substrate due to external damage. The electronic component mounting substrate of this disclosure includes a substrate, electronic components, and an anti-peeling layer, wherein the anti-peeling layer satisfies (1) the rate of change X of the static friction coefficient calculated by [Equation 1] is -50% or more and 200% or less, and (2) the exponent Y calculated by [Equation 2] is 0.8 or more and 20.0 or less. [Equation 1] X=(μk 300 -μk 100 ) / μk 100 ×100[Equation 2]Y=R2 / (R1+A1).

[Problem] To provide: a laminated film that provides a resin sheet with high smoothness and good sliding properties. [Solution] A laminated film comprising: a polyester-based substrate film, a release layer, and a resin sheet disposed on the side of the release layer opposite to the substrate, wherein the resin sheet is obtained by curing a resin sheet forming composition containing a resin component (A) and a crosslinking agent (B), the resin sheet substantially does not contain particles, the film thickness (t1) of the resin sheet is 1 μm or more and 20 μm or less, the arithmetic mean height (Sa) of the surface (1) of the resin sheet is 2 nm or more and 30 nm or less, the indentation modulus (E1) of the surface (1) of the resin sheet is 2.0 MPa or more, the indentation modulus (E2) of the surface (2) of the resin sheet is 2.0 MPa or more, the absolute value of the difference between E1 and E2 is 1.5 or less, and the static friction coefficient measured by overlapping the surface (1) of the resin sheet opposite to the release layer side with the surface (2) of the resin sheet on the release layer side is 1.5 or less.

A wheel bearing arrangement (1) comprises a wheel hub (10) with an internal toothing (12), a wheel bearing (20) arranged on the wheel hub (10), a constant velocity joint (30) with an axle journal (32), wherein the axle journal (32) has an external toothing (33) which engages with the internal toothing (12) of the wheel hub (10) for torque transmission, and a clamping device (40) by means of which the wheel hub (10) including the wheel bearing (20) is axially clamped against the constant velocity joint (30) such that an inner bearing ring (21) of the wheel bearing (20) is pressed against a contact shoulder (34) of the constant velocity joint (30). A metallic, uncoated friction ring (50) is arranged between the inner bearing ring (21) and the contact shoulder (34), the sliding friction coefficient for which the contact coefficient against the inner bearing ring (21) and the contact shoulder (34) is at least 80% of the static friction coefficient.

The application belongs to the technical field of energy consumption calculation, and discloses a railway wagon running process wheel and track friction energy consumption calculation method and system, which comprises the following steps: constructing a normal force coupling model between the wheel and the track; obtaining the dynamic parameters in the running process of the railway wagon, and calculating the sliding speed between the wheel and the track according to the dynamic parameters of the railway wagon; performing nonlinear dynamic correction on the static friction coefficient between the wheel and the track based on the sliding speed, and obtaining the corrected friction coefficient; based on the sliding speed, the corrected friction coefficient and the normal force coupling model, the friction power is calculated and integrated in sections according to different working conditions of the railway wagon, and the friction energy consumption between the wheel and the track is obtained. Through multi-source dynamic load integrated modeling, nonlinear friction coefficient dynamic correction, creep component decoupling and working condition adaptive integration, the application realizes high-precision real-time calculation of the friction energy consumption between the wheel and the track.