31results about How to "Reliable friction" patented technology

A sliding exercise apparatus and recreational device which can be employed both wet and dry. A user can traverse the device which includes a surface which can be inclined as a durable low friction sheeting material. The user can be supported by a wide variety of vehicles including sports boards and clothing apparel which, in turn, have a durable low friction layer for contacting the sliding exercise apparatus and recreational device for entertainment and in order to enhance gymnastic and board skills.

The present invention provides a system for structural damping by using floor slippage when the structure encounters a rare earthquake, including a damping layer floor, a frictional damping layer and an elastic buffer device; the frictional damping layer is laid on the The lower part of the floor slab of the friction damping layer is integrally poured together with the frame beam and frame column of the friction damping layer; the elastic buffer device is installed at the junction of the floor slab of the damping layer with the column body and the ring beam. The floor of the shock-absorbing floor is a part of the main structure, and it is converted into a shock-absorbing mass, which avoids adding too much mass to the main structure, and is easier to implement, eliminating the need to add hundreds of tons or even thousands of tons of mass blocks. Structurally, the possibility of increasing the vertical bearing load of the structure; laying the friction damping layer on the bottom layer can provide reliable friction for the damping layer floor, and the construction is simple and easy to implement; through the design of a reasonable elastic buffer device, shock absorption can be avoided The first floor slab collides with the main structure during the sliding process.

The piezoelectric pump comprises a housing, containing the following components connected in series: a rear piezoelectric clamp section, a piezoelectric extender section and a front piezoelectric clamp section. A displacer of pumped fluid is connected to the front piezoelectric clamp section. Electric pulses accessing at sections from a control station cause said sections to become fixed alternately inside the housing. Under the effect of electric pulses, the piezoelectric extender section moves the displacer step-by-step in one direction. Positive effect achieved by the invention is that of increasing the service life of the piezoelectric pump, expanding the scope of use thereof by increasing the number of fluids that can be pumped and also providing for a greater pressure by preventing contact between the pumped fluid and the friction surfaces of the housing and the piezoelectric clamp sections.

An arrangement for axial locking of rotating blades in a rotor is provided. The arrangement includes a shaft collar, a projection, plate-like sealing elements, and a blocking element. The sealing elements are provided for axially securing the rotating blades. At least one sealing element has an opening for securing the sealing elements against displacement in the circumferential direction. The blocking element is inserted in a recess from the end side of the shaft collar and blocks the displacement path of the sealing element. In order for the blocking element to be secured against unintentional releasing, the blocking element is fastened on the rotor disk using plastic deformation.

The invention discloses an inside single-beam sealed prestressed group-anchor system which comprises a protection cover assembly, working clamping pieces, a sealing anchor plate assembly, anchor bearing plates, a plurality of single-beam sealed prestressed ribs and pre-embedded channels; the sealing anchor plate assembly comprises working anchor plates, rubber cone sleeves, plastic limiting sleeves and a pressing plate; the rubber cone sleeves are of a multiple-piece wedge-shaped rubber ring structure; and the plastic limiting sleeves are arranged to be hollow round shaft sleeves with unequaldiameters and steps. In an installation state, the prestressed ribs correspondingly penetrate through the pressing plate, the plastic limiting sleeves, the rubber cone sleeves located in cone holes IIand cone holes I of the working anchor plates; the working clips clamps the prestressed ribs; the rubber cone sleeves tightly press and cooperate with the working anchor plates cone holes II, and therubber cone sleeves tightly press and cooperate with the prestressed ribs PE protection sleeves. The group-anchor system is mainly used for working conditions with longitudinal replaceable prestressed ribs inside. The sealing anchor plate assembly is used for effectively sealing and connecting with the exposed parts of the prestressed ribs PE protection sleeves, and therefore effectively sealingand anti-corrosion protection are achieved for the prestressed ribs; and construction is simple and practicability is high.

The invention relates to a dissymmetrically-arranged single-piezoelectric stack driving type bidirectional rotary inertia actuator. The actuator comprises an upper end cover, a bearing, an output shaft, a rotary round disc and an actuating mechanism, wherein the actuating mechanism is integratedly processed and is dissymmetrically arranged about a center of a diamond ring in the actuating mechanism, a piezoelectric stack is in interference fit with the interior of the diamond ring along an axial direction, two side planes of the diamond ring are respectively and rigidly connected with L-shaped lever amplification mechanisms along the axial direction, one end of an axial rod piece of each L-shaped lever amplification mechanism is connected with an installation table by a flexible hinge, the other end of the axial rod piece is fixedly connected with a horizontal rod piece, a friction foot is processed on the horizontal rod piece in a protruding way, the rotary round disc is horizontally arranged above the friction foot of the actuating mechanism, the output shaft is arranged at in disc center of an upper surface of the rotary round disc and is connected with the upper end cover by the bearing, the upper end cover is in a spindle shape, and through holes are formed in two ends of the upper end cover and are tightly connected with the actuating mechanism at a bottom end by bolts. The actuator is small in size and novel in structure, and high-accuracy bidirectional rotation motion can be stably achieved only by driving a single piezoelectric stack.

A bolt-hole cap for sealing the bolt hole of a rail includes a top face and a bottom face from which multiple protrusions extend. Each protrusion extends radially from inner portion toward outer portion of the bolt-hole cap. Each protrusion has two side faces and an end face connected between the two side faces. The end face has a first width. When the bolt-hole cap is inserted into a bolt hole and the top face of the bolt-hole cap is in flush with the top face of the rail, the end face of each of the protrusions contacts the bolt in the bolt hole. The protrusions are plastically deformed toward the side faces and the end face has a second width which is wider than the first width, so that the bolt-hole cap has sufficient strength to keep the top thereof flushing the top of the rail.

The invention provides an air cylinder friction force testing device and method. The air cylinder friction force testing device comprises an installation platform, a motion transmission part, a connecting assembly, a tested part, a supporting part and an air cylinder pressure control system. Three air cylinders with the same piston acting areas of rod cavities and rodless cavities are selected; the two air cylinders are oppositely arranged; and the rod cavities and rodless cavities of the two air cylinders are communicated with each other and externally connected with an air tank. With a normally-closed quick switch valve, the pressure of the air tank is made to be a constant value based on a corresponding control algorithm; pressures applied to the pistons of the two cylinders by compressed air can be cancelled mutually; and a force measured directly by a tension and pressure sensor is the sum of friction forces of two cylinders. On the basis of the same method, the sums of cylinder friction forces under relative installation of two of the three cylinders are measured three times. And then a ternary linear equation set is solved to calculate friction forces of all cylinders. The air cylinder friction force testing device and method have high measurement precision and universality.

The present invention discloses a crankshaft rotation tool, comprising a locating block and a handle connected with the locating block, wherein the locating block comprises a main locating block and two auxiliary locating blocks arranged at two sides of the main locating block, each auxiliary locating block is provided with an elastic component used for being tightly contacted with an excircle of a big end of a crankshaft, and the main locating block is provided with a locating hole used for cooperating with a locating pin at the end face of the big end of the crankshaft. The present invention aims to provide the crankshaft rotation tool which is simple in structure, convenient and reliable in use, and capable of forwards and reversely rotating the crankshaft, at the same time, the present invention also provides a method for rotating the crankshaft by adopting the crankshaft rotation tool.

The invention discloses a fishing boat stern shaft braking device to solve the problems that an existing fishing boat stern shaft is long in the inertia braking time and is high in reverse brake transmission component damage. The fishing boat stern shaft braking device comprises a hydraulic pump station, a hydraulic oil cylinder, a mounting plate assembly, a semi-circle upper hoop body and a lowerhoop body. The upper hoop body and the lower hoop body encircle to form an embracing shape. Friction pieces are respectively arranged on the opposite faces of the upper hoop body and the lower hoop body. The connecting ends of the upper hoop body and the lower hoop body are respectively rotatably connected with the mounting plate assembly through connecting pieces. An executing mechanism is arranged between the locking ends of the upper hoop body and the lower hoop body. A cylinder body of the hydraulic oil cylinder is fixed to the locking end of the upper hoop body. A piston rod of the hydraulic oil cylinder drives the upper hoop body and the lower hoop body to encircle or separate through the executing mechanism. The semi-circle upper hoop body and the lower hoop body encircle to form an embracing stem shaft in an embracing shape. Friction braking is achieved between the friction pieces on the opposite faces and a stopping sleeve at the stem shaft. The braking efficiency is high, and component damage is little.

The invention discloses a plastic pipe outer surface cleaning device for processing plastic products. The device comprises a base, the top end of the base is provided with a movable seat, the rear endof the movable seat is provided with a mounting seat, the movable seat is fixedly connected with the base through the mounting seat, the innovation of the device lies in the ability to clean the outer surface of a plastic pipe with a simple structural device, and the degree of automation is high; the device is integrally fixed at the upper end of the base, the movable seat can make the plastic pipe member pass through the movable seat and an outer brush holder in turn, the outer surface of the whole plastic pipe is cleaned, for the inside of the movable seat, the principle that a plurality ofrotating shafts cooperate with a rotating body to roll and rub a pipe body is used, a moving motor drives the rotating shafts and the rotating body, so that a pipe member moves inside the movable seat, the rotating body is made of a flexible rubber material, in the case that the diameter of the pipe member is smaller than the diameter of a small end of a limiting hole, pipe members of different diameters can be matched, the friction can be ensured reliably without slipping, the overall structure is simple and compact, and the use is convenient.

The invention relates to a wheel driving device and a wheelchair, in particular to a wheel driving device and an electric wheelchair. The wheel driving device comprises a driving wheel and a motor fordriving the driving wheel to rotate, and the driving wheel is in detachable driving connection with a wheel. The device solves the technical problems that when an equipment battery of a driving wheelin the prior art is out of power, manual pushing resistance is large and pushing wastes efforts. The wheel driving device and the wheelchair provided with the same are further provided. The wheel driving device electrically drives the wheel when there is power and makes riding or pushing need less efforts when the battery is out of power.

A system for estimating the friction between a road surface and a tire of a vehicle includes at least one first sensor and at least one vehicle processing device containing a friction estimation algorithm which is arranged to estimate the friction between the road surface and the tire of the vehicle based on friction related measurements is provided. The vehicle processing device is arranged to: receive an estimate of the expected friction between the road surface and the tire of the vehicle from a central processing device, from a storage device in the vehicle, or from at least one second sensor in the vehicle; adapt the friction estimation algorithm based on said received estimate of the expected friction; receive at least one friction related measurement from the at least one first sensor in the vehicle; and use the adapted friction estimation algorithm to perform an estimation of the friction between the road surface and the tire of the vehicle based on the at least one friction related measurement.

A friction device for rolling up curtains and the like includes a tubular roller (1), on which a curtain (1a) is wound. The roller (1) is rotatably carried by a support (10) and a threaded stem (2) is situated axially inside the roller (1) and carries, mounted thereon by a screw coupling, an operative body (3), likewise situated inside the roller (1). The operative body (3) translates axially with respect to the threaded stem (2) during motion of the curtain (1a) from a rolled up configuration (A) to a unrolled configuration (B). Elastic blocks (41, 51) push on the operating body (3) to produce a friction effect on the operating body and transmitted to roller (1) during curtain (1a) transition between the unrolled and rolled up configurations, thus allowing operation of the curtain in a substantially balanced way during rolling up and/or unrolling. Stop nuts (40, 50) are fastened to the threaded stem (2) for compressing the elastic blocks against surfaces of the operating body (3).