927 results about "Tooth number" patented technology

A method for making a dental implant by obtaining images of the tooth pre-atraumatic tooth extraction and post extraction and using those images to computer generate and mill a titanium replacement implant employing CAD/CAM equipment. The implant includes a scalloped neck interface similar to the replaced tooth's scalloped cementoenamel junction, a polished neck area between a root portion and a crown portion, and the numeral for the tooth number imprinted on the implant's facial surface. Chevron retention fins are provided on the root portion for engaging the bone of the tooth socket or osteotomy when the implant is tapped into position. Retention grooves are provided on the crown portion to which a provisional crown is cemented slightly out of occlusion at the time the implant is placed. The provisional crown will be replaced with a permanent crown after osteointegration of the implant has occurred.

A high-precision small modulus gear vision measurement method is disclosed. The method is characterized by after a CCD camera is calibrated, carrying out small modulus gear coordinate conversion, outputting an actual physical coordinate of a small modulus gear and calculating a correlation parameter coordinate scale factor, a rotation matrix and a translation matrix; reflecting a space position relation between a gear to be measured and a measurement system in the measurement system; carrying out image processing, wherein a processed object is a small modulus gear edge contour image acquired from a CCD camera 3; and carrying out denoising; then using and carrying out 1/8 sub-pixel edge extraction, extracting an edge point coordinate, carrying out center fitting and acquiring a center coordinate of the image; according to an edge point, acquiring a basic gear parameter, wherein the basic parameter is a tooth number, a mode number, a reference circle diameter and a pressure angle; fitting a standard gear contour curve; and comparing an actually-acquired edge contour curve with a theoretical contour curve so as to acquire a pitch deviation and a tooth profile deviation. The basic gear parameter and quality can be comprehensively analyzed and evaluated.

The invention discloses a double-stator permanent-magnet vernier wind driven generator, and belongs to the field of motor manufacturing. The double-stator permanent-magnet vernier wind driven generator comprises an outer stator (4), an inner stator (8) and a rotor (6), wherein the outer stator is provided with a pear-shaped groove and first stator teeth; the inner stator (8) is provided with second stator teeth (9), and each second stator tooth (9) is provided with a flux modulation electrode (10) and a flux modulation electrode groove (11); the rotor (6) is of a cup-shaped structure, and a Halbach-structure permanent magnet (7) is arranged on the rotor; the tooth number of the first stator teeth of the outer stator (4) is equal to that of the teeth of the flux modulation electrode (10); moreover, the pear-shaped groove of the outer stator (4) and the flux modulation electrode (10) are oppositely distributed and arranged, and the first stator teeth of the outer stator (4) and the flux modulation electrode groove (11) are oppositely distributed and arranged. The double-stator permanent-magnet vernier wind driven generator disclosed by the invention is capable of generating a high-sine air-gap magnetic field, and has the characteristic of a high output torque.

The invention discloses a multitooth magnetic bridge type hybrid excitation magnetic flux switching motor. Permanent magnets, an armature winding and a single-phase excitation winding are installed on a stator; the tooth number of the stator is four times of the number of the permanent magnets; and part of a rotor part is a salient pole, and a rotor has no winding or permanent magnets and has simple and firm structure. An air gap magnetic field comprises an electric excitation magnetic field generated by the excitation winding and a magnetic field generated by the permanent magnets and is adjusted by changing the magnitude and the direction of excitation current, thereby improving the rotating speed operating range and the magnetic weakening capability of the motor. An electric excitation magnetic force line is connected with a magnetic bridge for closing after penetrating through an iron core at the top of the permanent magnets, which is beneficial to reducing the electric excitation ampere turns. The invention has parallel connecting structure of the excitation winding and the permanent magnet in space, bipolarity of phase magnetic flux, large magnetic chain change amplitude value and higher torque output capability and power density and is suitable for a low-speed straight application occasion.

The invention relates to a complex precise cycloidal speed reducer, which comprises an eccentric shaft, wherein the eccentric parts of the eccentric shaft are connected with cycloidal gears through turning arm bearings, the cycloidal gears are matched with pin tooth pins fixed on pin tooth shells, the eccentric shaft is provided with a plurality of staggered eccentric positions, the cycloidal gears outside the eccentric positions are divided into a group of negative cycloidal gears and a group of positive cycloidal gears, the negative cycloidal gears and the positive cycloidal gears have different tooth number and are provided with connecting transmission holes, the pin tooth shells are divided into static pin tooth shells and output pin tooth shells, the negative cycloidal gears are matched with the static pin tooth pins fixed on the static pin tooth shells, the positive cycloidal gears are matched with the follow-up pin tooth pins fixed on the output pin tooth shells, the eccentric shaft is connected with a gearwheel, and the gearwheel is engaged with an input shaft gear. By composite design of a primary involute planetary gear transmission and cycloidal pin wheel epicyclic gear train, the complex precise cycloidal speed reducer has the advantages of high precision, high efficiency, high rigidity, high bearing and long service life and is particularly suitable to be used in a heavy-duty industrial robot.

The invention discloses a method for machining cylindrical gear cutting teeth. The rotation speeds of a workpiece and a cutter are n1 and n2 respectively, the ratio of the n1 to the n2 is equal to the ratio of the tooth number of the cutter and the workpiece, and the cutter is equivalent to a gear engaged with the workpiece. During machining, the axes of two main shafts of the workpiece and the cuter form a crossed axis angle alpha, and the angle alpha is the algebraic sum of a tooth directional spiral angle beta of the workpiece and a tooth directional spiral angle gamma of the cutter. The blade shape of the cutter is designed to be conjugate with the tooth shape of the workpiece; the rotations of the workpiece and the cutter are controlled by a multi-axis movement controller; and the cutter has axial feed and radial feed. At a cutting point, the cutting speed V is changed along with the change of the cutting point on the blade to form a cutting action so as to finish cutting and shaping of a gear tooth surface of the workpiece. The machining for a non-penetrating involute inner tooth can be finished without a tool withdrawal groove and cannot be finished by the existing gear machining technology. An inserting tooth and a pull tooth can be replaced, the machining precision and efficiency can be improved, and the manufacturing cost can be greatly reduced.

A method for designing modeled lines of rotor on screw compressor includes selecting one or a numbers of quadric curves to form tooth curve , using quantitative calculation to calculate out geometric character value of tooth curve and predicting integral performance of said compressor, adjusting and optimizing tooth number combination and modeled lines parameter to make steam resultant torque of negative rotor with designed modeled lines be near to zero , using finite element method to analyze and calculate deformation of each element of modeled lines for confirming engagement gap and setting driving zone at driving and no driving side near to nodal circle in order to use pure roll mode to contact and transmit torque near nodal circle .

In a flat wave gear device in which a flexible externally toothed gear and the rigid internally toothed gear have the same number of teeth, an arcuate tooth profile is imparted to a flexible externally toothed gear, a contact point C between tooth profiles of a flexible externally toothed gear and a D-side rigid internally toothed gear is determined from an arc center A of the arcuate tooth profile of the flexible externally toothed gear and from a momentary center S of relative movement between the gears, and a main part of a tooth profile to be formed in the D-side rigid internally toothed gear is calculated based on the contact point. The tooth profile of the D-side rigid internally toothed gear can be accurately designed; therefore, meshing between the gears can occur with zero backlash, ratcheting torque can be increased, and continuous meshing can occur across a wide range of the movement locus of the tooth profiles of both gears. The load capability of the flat wave gear device can accordingly be increased.

The invention relates to a broach and discloses a special-shaped hole broach which comprises a handle part, a neck part, a transition conical part, a front guide part, cutting parts and a tail part. The handle part, the neck part, the transition conical part, the front guide part, the cutting parts and the tail part are sequentially connected into a whole from the cutting-in end to the cutting-out end. A scrap containing groove is formed between every two adjacent cutting teeth. The total length from the front end of the handle part to the tail end of the tail part is not smaller than 1200 mm, and the outer diameters from the front guide part to the tail part in sequence are sequentially increased; the cutting parts comprise round hole teeth, circular arc teeth, cutting teeth, transition teeth and calibration teeth, wherein the round hole teeth, the circular arc teeth, the cutting teeth, the transition teeth and the calibration teeth are sequentially arranged from front to back and connected into a whole. The number of the teeth of the cutting parts is from 130 to 150. The invention further discloses a machining process method for the special-shaped hole broach. The broach is large in total length and high in slenderness ratio; the multiple cutting parts different in tooth shape are used for broaching a special-shaped hole, based on the high-precision ultra-slenderness machining and thermal treating process, a method for carrying out segmentation gradual grinding through a locating sleeve and a supporting point is adopted, it is ensured that jump of the solid broach is from 0.01 mm to 0.02 mm, stress deformation caused by cutter relieving and drooping can be effectively avoided, and therefore the stability of machining and forming is good.

The invention relates to a sensor, and aims at providing a coding magnetic resistance combination type electronic stability program (ESP) absolute type multi-loop angle sensor which is developed special for an automobile ESP. The angle sensor comprises a gear which rotates along with a steering wheel tubular column, a coding disc with a concentric circle is arranged on the gear, notches of arc section shapes are distributed on the coding disc, a small gear is further meshed with the gear, the small gear further comprises magnets which are distributed in a radial mode, rotation of the small gear can be detected by a magnetic induction angle sensor, and the output range of the small gear is from 0-360 degrees; the small gear is k times as small as the gear in tooth number, four Hall-effect switch chips with magnets are arranged on the circumference of the coding disc at intervals of 30 degrees, when the coding disc rotates 30 degrees, output of the four Hall-effect switch chips changes once, and the four Hall-effect switch chips can be combined with the coding disc to achieve four-digit binary digits formed by 0 and 1 in a single loop to indicate every 30 degrees. According to the coding magnetic resistance combination type ESP absolute type multi-loop angle sensor, a vernier principle is designed in a step-by-step mode, the tolerance range of a product is enlarged, the number of used angle sensing chips is reduced, accuracy of the angle sensors is not reduced, and design cost is reduced at the same time.

It is an object of the present invention to provide a differential apparatus for a vehicle with a gear obtaining a sufficient mechanical strength against any torsion torque and preventing from being large and heavy as a whole and preventing from making a high manufacturing cost.

The differential apparatus for the vehicle with the gear comprises a pair of output gears 3, 4, a first pinion gear 5 intermeshing with one of output pinion gears 3, 4 with a parallel gear axis to the first pinion gear 5, a second pinion gear 6 intermeshing with both of the other of output pinion gears 3, 4 and the first pinion gear 5 with parallel gear axes to the second pinion gear 6 respectively, and a differential case 2 accommodating the pair of output gears 3, 4, the first pinion gear 5 and the second pinion gear 6. The second pinion gear 6 has a large and a small gear portions 6A, 6B each of which pitch diameter is different respectively and each of which tooth number is same respectively, and a tooth lead 60 and a tooth space 61 formed to be shared by the large and the small gear portions 6A, 6B continuously from the large gear portion 6B to the small gear portion 6A.

The invention discloses a breeze power generation device based on piezoelectric effects. The breeze power generation device comprises a base plate, piezoelectric vibrators and a lifting fan, wherein the piezoelectric vibrators and the lifting fan are arranged on the base plate, a cam with teeth is connected onto a rotation shaft of the lifting fan, the piezoelectric vibrators are evenly distributed on the outside of the cam, a tooth crest of the cam is pinnacle, and teeth number of the cam is N, the number of the piezoelectric vibrators is M, the M and the N are relatively prime, and 2<=M<=18, and 4<=N<=19. The teeth number of the cam and the number of the piezoelectric vibrators are relatively prime, the cam can be guaranteed to be contacted with one piezoelectric vibrator at the same time to reduce a peak value of transient drag and enable the lifting fan to be stable in a rotation process, the tooth crest of the cam is polished to be tip, and when the piezoelectric vibrators are stirred, no contact exists. After that, the piezoelectric vibrators begin to freely vibrate, and energy caused by stirring and wiping each time is effectively used. The breeze power generation device effectively reduces rotation resistance, improves energy utilization efficiency and enables start-up wind speed and work speed to be lowered compared with the prior art.

Provided herein are methods and apparatuses for analyzing a patient's dental arches in order to generate a treatment plan for the dentition. In particular described herein are methods and apparatuses for determining accurate standardized tooth numbering even when there are missing and/or supernumerary teeth.

The invention provides an orthodontic method and device based on artificial intelligence. The method comprises obtaining tagged oral CT image data, wherein the tagged oral CT image data circle the tooth area on each frame of the image in the form of an annotation; the circled area is marked with the corresponding tooth number, and the non-dental area is set to 0; the tagged oral CT image data is inputted into a second generator to obtain an orthodontic scheme represented in a coded form; according to the orthodontic scheme, a printable dentition model is obtained by combining the three-dimensional digital model of teeth obtained from the marked oral CT image data; an appliance can be made in basis of the model of the teeth. The device relates to multiply machine learning models and realizes automation of the whole process from 3D digitization of teeth to Model Manufacturing, which is not easily subject to the subjective influence of a doctor and capable of improving the efficiency of diagnosis and treatment.

The invention relates to a method for determining a face gear slotting cutter tooth form structure, which can determine a reasonable tooth number of a face gear slotting processing cutter based on the basic principles of face gear slotting gear processing and face gear meshing drive in comprehensive consideration of affects of different slotting cutter tooth number to the processing dimensions of a face gear and the drive meshing performance of a processed face gear, and further determines a face gear slotting cutter structure to be processed according to the tooth number of a pinion that is matched with the face gear. The face gear processed by the determined face gear slotting cutter tooth structure has good drive performance, the follow-up cost to reshape the face gear in order to improve the meshing performance of the face gear is saved, and meanwhile, the processing efficiency of the face gear is improved.

A chain wheel for a bicycle includes an oblong gear having a flat shape. The oblong gear has a central point and has a periphery having two opposite relatively shortest points and two opposite relatively longest points. The periphery of the oblong gear has a tooth number equal to that of a circular gear. The oblong gear is driven by two pedals to drive and rotate a chain. Thus, the moment produced by the oblong gear has different values to compensate the different positions of the two pedals, so that the rider's legs can apply a pedaling force on the two pedals evenly and smoothly, thereby facilitating the rider pedaling the two pedals.

The invention discloses an involute arc tooth profile bevel gear and a meshing pair thereof. The tooth profile curve of bevel gear is formed by the way that an arc does helical motion along the tooth surface contact line on involute helicoids, thus having the advantages that involute gear center distance has separability and is convenient to measure, involute gear is convenient to manufacture and an arc gear has high contact strength and good running-in property, tooth surface contact stress is reduced, tooth surface carrying capacity is greatly improved, and processing is convenient; and the tooth curve of the arc and the radial length of involute participating in meshing are short, thus avoiding undercutting phenomenon of standard gear, so that minimum tooth number of the gear can reach 1. Compared with the gear in the prior art, weight and size are greatly reduced; and the meshing pair adopts the way that a convex gear is meshed with a concave gear, and carrying capacity is high.