42results about How to "Improve contact stiffness" patented technology

The invention discloses a novel harmonic-reducer input transmission structure. The novel harmonic-reducer input transmission structure comprises a cam connected with an input shaft, and the cam is sleeved with a flexible gear; a steel gear is engaged with the flexible gear, outer teeth are arranged on the flexible gear, inner teeth are arranged on the steel gear, and the flexible gear is engaged with the steel gear through the outer teeth and the inner teeth; a keeping frame is arranged between the flexible gear and the cam, and a cylinder roller is installed in the keeping frame; annular flanges are formed inside the flexible gear and outside the cam in an outward-protruding mode, and C-shaped grooves matched with the cylinder roller are formed in the annular flanges; the annular flanges are located on the outer-tooth side of the flexible gear. By means of the novel harmonic-reducer input transmission structure, the assembly stress of a key part of a harmonic reducer is reduced or eliminated, the engaging stress of the steel gear and the flexible gear in the movement process is reduced, the input structure and the output structure of the harmonic reducer are newly designed, the movement of the harmonic reducer is more stable during working, and the service life is prolonged.

The invention relates to the field of a double-faced grinding/polishing machine, in particular to a planetary transmission structure of a double-faced grinding/polishing machine. The planetary transmission mechanism for the double-faced grinding/polishing machine comprises a planetary wheel (5) meshed with a gear ring (2), wherein the planetary wheel (5) is meshed with a sun wheel (7) and is arranged on a lower plate (6); a circle of gear ring pin teeth (3) are uniformly arranged on the inside surface of the gear ring (2); a tooth pitch is formed between two gear ring pin teeth (3); and the gear ring (2) is meshed with the planetary wheel (5) through the gear ring pin teeth (3). The invention has the advantages that because the pin tooth transmission is adopted, the cost of materials and the processing cost of an inner gear ring are reduced; the problem that the processing difficulty is increased because the size of the gear ring is increased is solved, and the problems of inconvenient maintenance and high using cost after the teeth are worn in the using process are solved; and simultaneously, because each pin tooth is in the shape of a circular arc and the meshing line is long, the contact rigidity of a part is improved, and the service life of the part is prolonged.

The invention relates to a support unit of a two-support and one-lifting target support rotary table. The support unit mainly consists of a vertical driving guide assembly, a horizontal driving guide assembly, and a support rod and wave absorbing material sleeve cylinder assembly. The support unit is characterized in that the support function of the two-support and one-lifting target support rotary table is mainly realized, and the high-precision movement of the support unit along two directions is realized, namely the vertical movement along the direction of a revolving shaft of the target support rotary table, and the horizontal movement along the radial direction of the target support rotary table; the high-precision movement and positioning along the vertical direction can be realized by the matching of two servo driving motors, two groups of high-precision ball screws and four groups of high-precision guide columns, and the high-precision movement and positioning along the horizontal direction can be realized by the matching of one servo driving motor, one group of high-precision ball screw and two linear guide rails; a support rod is connected with a to-be-tested target through a ball hinge movement pair. The support unit has the advantages that the movement is flexible, the stability is high, the contact area is small, and the like; the support unit is matched with a traction unit, so that the building height and pitch attitude of the to-be-tested target can be adjusted.

The invention discloses a sliding device, in particular a slide guide rail rolling and unloading device for machine tool equipment. The device comprises a guide rail and a slide seat (1) which is positioned on the guide rail and can slide relative to the guide rail, and is characterized in that: at least three positions matched with the guide rail on the bottom surface of the slide seat (1) are provided with roller wheels (6), and the circumferential lateral surfaces of the roller wheels (6) are contacted with the upper surface of the guide rail positioned under the slide seat (1). In the device, as the slide seat and the guide rail do not directly contact, are supported by the roller wheel, and slide, the device realizes line contact of the roller wheel and the guide rail, greatly reduces the mutual friction area, reduces moving resistance, saves energy and lowers the requirement on lubrication compared with a sliding mode of surface contact.

The invention belongs to the technical field of bulk material transport equipment and particularly relates to a trolley group towed type adhesive tape conveyor. The problems are solved that existing adhesive tape conveyors have a large difference in tension of adhesive tapes, the running adhesive tapes deviate and are unsafe, the running resistance is large, and the energy consumption is high. Theadhesive tape conveyor comprises a fixed bearing rack, a driving device, a traction mechanism and a guiding mechanism, wherein the driving device, the traction mechanism and the guiding mechanism aredisposed on the fixed bearing rack; the traction mechanism pulls a trolley group sprocket chain to move horizontally on the rack when a machine head guide rail sprocket wheel rotates so that trolleygroup sprocket trolleys can move along a guide rail, and the adhesive tapes are moved forward simultaneously, so that transport of materials is achieved. The adhesive tapes are in fraction with trolley supports to transmit a traction force, and the adhesive tapes run along with a belt conveyor body under the action of the traction force of the trolleys; since the trolleys are distributed at intervals, segmental traction is achieved, and the difference in the tension of the adhesive tapes is small. The low-strength adhesive tapes can be selected, and the investment cost of the adhesive tapes isreduced.

The invention relates to the field of sensor technology, and particularly to a charge output structure. The structure includes a base; and a pre-tensioning member, which is arranged on outer circumference of a mass block in a sleeving manner, and has an annular structure of which volume is contracted with temperature increasing for applying radial-direction pre-tensioning force to an insulating member, a piezoelectric element and the mass block. The insulating member, the piezoelectric element and the mass block are sequentially arranged in a sleeving manner from an inside to an outside alonga radial direction of the base. The invention also provides a piezoelectric acceleration sensor with the above-described charge output structure. The structure and the sensor greatly increase contactstiffness of the overall structure, and thus improve the overall frequency response characteristics and resonance.

The rigid-flexible coupling hyper-redundant intelligent sensing mechanical arm comprises a mechanical arm body, an operation device and a driving mechanism are arranged at the front end and the rear end of the mechanical arm body respectively, and the mechanical arm body is formed by sequentially connecting a plurality of bending units; each bending unit comprises a plurality of middle sections connected in sequence, base sections are arranged at the two ends of each middle section, the base sections and the middle sections are of hollow cylindrical structures, the base sections and the middle sections are movably connected through cross hinges, and every two adjacent middle sections are movably connected through cross hinges; the driving mechanism comprises a plurality of driving motors, reels are arranged on rotating shafts of the driving motors, a plurality of tendon ropes are arranged in the bending unit, one ends of the tendon ropes are fixed to the front end of the bending unit, and the other ends of the tendon ropes are connected with the reels respectively. The mechanical arm has the advantages of modularization, super-redundancy self-adaption, high space environment adaptability, measurable tail end pose, perceptible external contact and the like, and can be used for capturing and grabbing non-cooperative and cooperative targets and internal investigation of complex cavities.

The invention relates to the technical field of vehicle friction abnormal sound prediction, in particular to an automobile friction abnormal sound risk prediction method and device, and the method comprises the following steps: S200, obtaining simulation relative displacement and simulation relative acceleration of a simulation node pair in a simulation process; S100, obtaining the test relative displacement and the test relative acceleration of the simulation node pairs through the friction abnormal sound test to serve as evaluation standards, wherein the test node pairs and the simulation node pairs are in one-to-one correspondence; S200, S200 and S100 being used only for distinguishing and not representing the sequence of the steps, and executing S300 after the S100 and S200 are executed; S300, judging the simulation relative displacement and the simulation relative acceleration according to the evaluation standard to generate a prediction result. By adopting the scheme, the technical problems that in the prior art, whether the position is redesigned, optimized and tested or not cannot be judged according to the sensing condition of the passenger in the vehicle on the friction abnormal sound, so that the development cost is wasted, and the development period is prolonged can be solved.

The invention discloses a titanium alloy notch bolt, which comprises a bolt head (1) and a screw rod (2); the upper part of the bolt head (1) is hexagonal, and the lower part of the bolt head (1) is a cylinder; the cylinder The diameter is larger than the diameter of the hexagonal outer circle, and when the bolt head is in contact with the loaded surface, the cylinder acts as a gasket; the screw rod (2) has a notch (3) in the middle. In the notch bolt of the present invention, a notch (3) is designed in the middle of the screw rod (2). While satisfying the static connection performance, the separation power provided by the pyrotechnic device to the notch at the moment of separation realizes reliable and efficient separate. Simultaneously, the notch bolt of the present invention adopts an integrated design, and the cylinder at the lower part of the bolt head (1) plays the role of a gasket, which reduces the loading surface of the bolt head and the contact surface of the gasket, increases the surface contact stiffness, and makes the concave Port bolts improve separation performance by increasing the stiffness of the contact surface under high dynamic shock loads.

The invention relates to a plunger pump transmission device. The plunger pump transmission device comprises a driving device and pump bodies, and further comprises power executing assemblies, wherein the power executing assemblies comprise guide rod shafts which move in the pump bodies in a reciprocating mode, eccentric discs and eccentric shafts; round swinging holes are formed in the ends, extending the pump bodies, of the guide rod shafts; the eccentric discs are round, the eccentric discs are arranged in the swinging holes and are rotationally connected with the swinging holes, round eccentric holes are formed in the eccentric discs, and the rotation axes of the eccentric holes are parallel to the rotation axes of the eccentric discs; and the eccentric shafts comprise power output ends and power input ends, the power output ends are arranged in the eccentric holes and are rotationally connected with the eccentric holes, and the power input ends are connected with the driving device. The plunger pump transmission device cannot only be applied to a small-flow region for a long time, but also can be applied to a large-flow area; and the plunger pump transmission device is long in service life, compact in structure and small in size.

The invention discloses a multi-prismatic high-speed solid ball bearing retainer. In the retainer, an external radial tangent perpendicular to the center line of each pocket of the retainer is drawn, all intersection points of the external radial tangents are connected to form a multi-prismatic shape and cause the thickness at the tangent intersection point to be thickened, and cause the contact stiffness of the tangent intersection point to be increased, which ensures the overall stiffness thereof; the multi-prismatic structure of the retainer causes the contact between the multi-prismatic structure and a circular bearing ring guide rib to be a two-point contact under the stable contact condition; on the one hand, the two-point contact can obviously enhance supporting stability of the retainer, and improve high-speed running stability of the retainer; on the other hand, the two-point contact reduces contact stress at the contact point of the retainer, and reduces frication and wear of the retainer; meanwhile, a tangential straight edge can seal part of lubricant in a contact state, which is beneficial to improving the lubrication status of the contact point of the multi-prismatic retainer 2; the external radial tangent height h of the multi-prismatic retainer is controlled between 0.1mm and 0.3mm, and the running smoothness of the multi-prismatic retainer is effectively ensured as the h numerical value is very small.

The invention discloses a worm provided with a double-involute-arc tooth profile and belongs to the technical field of worm wheel and worm transmission. The worm comprises a worm body and a worm tooth part. The worm tooth part is arranged in the middle of the worm body. The tooth profile of the cross section of the worm tooth part is in an involute arc shape. The tooth profile of the shaft cross section of the worm tooth part is also in an involute arc shape, thus, the worm composite arc tooth profile is formed and matched with a worm wheel tooth profile, the worm composite arc tooth profile is provided with an oil containing gap in the reference circle, and the portions close to the upper side and the lower side of the reference circle are in smooth coincidence contact along the worm wheel tooth profile to achieve meshing transmission. By means of selection and recombination of two involute arc segments of the cross section and the shaft cross section, the contact area can be increased, and contact stress is reduced. Meanwhile, oil containing space distribution is more reasonable, power of a transmission pair is increased, lubricating performance of the transmission pair is improved, multiple adverse factors in worm wheel and worm transmission are reduced greatly, and the application effect is improved.