39results about How to "Eliminate sliding friction" patented technology

The invention discloses an ultrasonic elliptical vibration extrusion device and a vibration extrusion processing method for carrying out surface finishing of a part by using the same. The ultrasonic elliptical vibration extrusion device comprises an amplitude transformer, four excitation sources with the same structure and an extrusion tool, wherein the extrusion tool is arranged on the output section of the amplitude transformer; and the four excitation sources are respectively arranged in the four grooves of the excitation section of the amplitude transformer. In the vibration extrusion processing process, an extrusion head makes the ultrasonic vibration in an elliptic orbit relative to the processed surface of the part under the driving of the excitation sources through adjusting an extrusion contact angle between the part and the diamond extrusion head and the processing parameters of ultrasonic elliptical vibration extrusion device. On one hand, the device reduces an extrusion force by utilizing the pulse impact action of the ultrasonic vibration, and thereby, the extrusion process can be applied to thin-wall parts and long and thin parts; on the other hand, the front direct impact is avoided and the sliding friction of the extrusion head and the processed surface of the part is reduced even eliminated by utilizing the separation characteristic and the movement locus characteristic of the elliptical vibration, and thereby, the surface roughness of the processed surface of the part is reduced, and the service life of the extrusion head is prolonged.

A combine harvester unloading system is provided in which an unloading auger (20) is swingable between a stowed position and an unloading position around an upright pivot axis disposed at one end of the auger. A pivotally mounted auger support cradle (26) is moveable between a reception position to engage the underside of the auger when transitioning into the stowed position and a supporting position under the auger when in the stowed position.

The present application discloses a pantograph head, comprising: a support structure; a roller structure capable of being in contact with a contact line to achieve conduction with the contact line and capable of rolling along the axial direction of the contact line; connection The roller structure and the support structure, and a connecting structure capable of moving the roller structure on the support structure along the radial direction of the contact line. The pantograph head with the above structure avoids the sliding friction between the sliding plate of the pantograph head and the contact line in both the horizontal and vertical directions, which significantly improves the current receiving effect between the pantograph and the mesh, and also facilitates maintenance and repair. Reduced maintenance costs.

A sliding friction-free gear has cams of specific profiles, rollers separating cooperating cams that roll over the cams of the gears, thus eliminating the sliding friction between the gears. The rollers are mounted rotatably e.g. in sliders or eccentrics, wherein the sliders, resp. eccentrics, are mounted slidingly, resp. rotatably, in a yoke attached rigidly to a shaft. The rollers are free to execute oscillating motion relative the yoke while rolling over the cam profiles of the cams of the gears. The cooperating members of the gear contact along a line like in conventional evolvent gears, and unlike in the Wildhaber-Novikov's gear (where the momentary contact between teeth of cooperating toothed wheels is pointwise); therefore the gear according to the present invention offers much larger transmission capacity and is much less prone to seizure than known gears.

The invention relates to the field of sports weapons. The crossbow comprises a bow with a bow string, a shoulder stock and a tubular stock which connects said bow and shoulder stock and has two diametrically arranged longitudinal helical grooves, the helical grooves in the stock are of through design, and the bow string is passed through the helical grooves, wherein the helical grooves have a length of not less than the value of the bow string tensioning motion. Furthermore, an arrow to be launched is arranged inside the stock and is brought into engagement with the bow string such that an axial force and a rotational moment can be transmitted to one of the structural elements: by means of an annular slide with two radial openings which are open therein, are diametrically arranged and through which the bow string is passed, inside a tube inserted into said openings, or without a slide, only with the aid of a tube which is slipped onto the bow string, for which supports are formed on the bow string, or directly from the bow string, without a slide and without a tube. A simplification of the design, a reduction in the weight and necessary power of the crossbow, and an increase in the stabilization of an arrow during flight are achieved.

The invention discloses a low flow pulsating bidirectional gear pump. The pump comprises a pump shell, a driving shaft and a driven shaft, which are arranged in the pump shell, internal gears driven by the driving shaft, external gears, which are fixedly connected to the driven shaft, and a crescent block arranged between the external gears and the internal gears. Three external gears are arranged in the same axis. Three internal gears are arranged in the same axis and engage with the corresponding external gears. The outmost internal gear is fixed with the driving shaft, and two neighbored internal gears cooperate in transmission. Three groups of gears are adopted, wherein in each group the gears are internally engaged, thus the flow pulsation and pressure pulsation during the operation process of gear pump are largely reduced, and the noise and impact are reduced. Passing holes are arranged in the internal gears, so that the fluid can directly enter the gear pump in the radial direction. The structure of the internally engaged gear pump is simplified, and the pump becomes more compact. The three internal gears are inserted and engaged in sequence, thus the slide friction between the outer rings of the three internal gears and the pump shell is eliminated, the rigidity and stability of the system is guaranteed, the pump noise is reduced, and the service life is prolonged.

Winding-machine for rolled or drawn wire / rod (F) with device to form a wire / rod coil (R) in a winding-machine with one or more winding reels (1) placed downstream of a wire / rod working installation, provided with wire / rod-drawing means (2-3) and thereafter: an oscillating wire / rod-guide (4) with wire / rod-guide handling means (6) to lead the end of the wire / rod-guide reel side to follow the winding so that the wire / rod from the said advancing means (2-3) is wound up in the reel (1) with first translation means (6­5) to move the reel side end (1) of the exit opening said wire / rod-guide (4) parallel to the reel / mandrel axis (1) and second translation means (8-6) to move said exit opening of said wire / rod-guide (4) in withdrawal / approach perpendicularly to the axis of said reel / mandrel (1) in order to follow the increase of diameter of the coil (R) during winding-up with improved wire / rod containment system at said exit opening (7). Said wire / rod containment system consists of at least one opposite pair of containment rolls (71) provided at the exit opening (7) of said wire / rod-guide (4).