56results about How to "Improved meshing" patented technology

The present invention provides a rack-and-pinion steering gear unit whereby the operating force of a steering wheel or the operating assist force of an electric motor can be prevented from increasing, and whereby response can be improved in fine operations during forward travel and the like. A back surface (29) of a rack shaft (9) is elastically pressed toward a pinion shaft (5) by a pressing roller (34). The pressing roller (34) is rotatably supported, via a radial needle bearing (16a), on a support shaft (33) supported on and fixed to a holder (30). A thrust needle bearing (35) for bearing a thrust load applied by the pressing roller (34) is provided between an inner side surface of the holder (30) and two side surfaces of the pressing roller (34) in the axial direction.

The invention discloses a worm and helical gear transmission pair based on a variable pressure angle and application of the worm and helical gear transmission pair. The worm and helical gear transmission pair is reliable in transmission, durable and easy to manufacture. In order to achieve the purposes, the worm and helical gear transmission pair based on the variable pressure angle comprises a worm and a helical gear which are engaged with each other, wherein the transverse module (Mt2) of the helical gear is equal to the shaft surface module (Ma1) of the worm; the tooth profile angle alpha n2 of the end face reference circle of the helical gear is larger than the tooth profile angle alpha n1 of the shaft surface reference circle of the worm; the swing angle beta 2 of the reference circle of the helical gear is equal to the lead angle lambda 1 of the shaft surface reference circle of the worm; the difference between the tooth profile angle alpha n2 of the end face reference circle of the helical gear and the tooth profile angle alpha n1 of the shaft surface reference circle of the worm is smaller than 10 degrees.

A one-way clutch comprising an inner race and an outer race radially spaced apart from each other and concentrically disposed for rotation relative to each other, and a spray disposed between the inner race and the outer race for transmitting torque is characterized in that the cam surface of the sprag which contacts with the outer peripheral surface of the inner race is formed with a plurality of axially extending grooves.

The invention discloses a fixing device used during operation, which belongs to the technical field of medical equipment. It includes a placement plate, one side of the placement plate is symmetrically provided with two support plates, and the ends of the two support plates away from the placement plate are connected by a mounting plate, and a first screw is inserted on the mounting plate, and the installation A socket corresponding to the first screw is provided on the board, and the first screw is threadedly connected to the inner wall of the socket, and an installation block is fixedly connected to the end of the first screw close to the placement plate, and the installation block is far away from the side of the first screw. One side is symmetrically provided with installation grooves, and the inner side wall of the installation groove is connected with an arc-shaped splint through the rotation of the first rotating shaft. A first chute corresponding to the first slider is provided on the support plate. The present invention is simple in structure, easy to use, can guarantee the fixation effect on the patient's trunk, and can avoid pinching the patient at the same time.

The invention relates to a high-bearing coal mining machine walking system which comprises a guide sliding shoe, a walking gear and a pin row. The walking gear and the pin row are engaged with each other. The walking gear is provided with double rows of gear teeth, and the structure parameters of the double rows of gear teeth are the same. The pin row is provided with double rows of tooth grooves,and the structure parameters of the double rows of tooth grooves are the same. The gear teeth and the tooth grooves are correspondingly engaged according to rows. The tooth faces of the gear teeth are outwards convex surfaces in the tooth width direction, correspondingly, the groove walls of the tooth grooves are inwards concave surfaces in the tooth width direction, and the walking gear and thepin row are in a mutually concave-convex embedded state on the normal sections of all engagement positions of the tooth profile of any gear tooth. The high-bearing coal mining machine walking system is high in bearing capability, high in reliability and capable of adapting to horizontal bending of the pin row, stress concentration cannot be generated on the edge of a gear of the walking gear, andthe high-bearing coal mining machine walking system can better meet the requirements for large-mining-height and large-powder direction development of coal mining machines.

The invention provides a non-guide foot of coal cutter. The non-guide foot comprises a non-guide foot body, wherein two side surfaces, which are contacted with two sides of a scraper conveyor cogged rail, of the non-guide foot are a plate type structure, wear-resistant plate mounting slots are formed in two ends of the non-guide foot body, wear-resistant devices are arranged in the wear-resistant plate mounting slots and are positioned by baffles which are arranged in the ends of the non-guide foot body, each wear-resistant device consists of wear-resistant plates and springs, grooves are formed in the wear-resistant plate, one ends of the spring are arranged in the grooves of the wear-resistant plate, grooves corresponding to those on the wear-resistant plates are formed at the wear-resistant plate mounting slots on the non-guide foot body, and the other ends of the springs are arranged in the grooves in the wear-resistant plate mounting slots on the non-guide foot body. According to the non-guide foot, the walking part of the coal cutter can be prolonged, the coal cutting production efficiency can be further increased, the equipment loss and fault rate can be reduced, the change is convenient and the production cost can be lowered.

During an emergency, in one form of a retractor having a spool, external teeth of a pawl provided at a spool right side end are made to mesh with some of internal teeth provided on a frame, and, with load acting on a seat belt, a spool left side end is brought into contact with a spool pushing portion. Since the spool left side end tends to be moved further in a direction of seat belt load with the load acting on the seat belt, the spool pushing portion pushes the spool left side end, whereby some of external teeth come into contact with internal teeth provided on the frame and fit deeply into gaps between adjacent ones of the internal teeth. Thus, some of the external teeth of the spool effectively come into mesh with the respective internal teeth of the frame with a simple movement of the spool.

The invention discloses a novel intelligent gear. The gear comprises a fixing disc and multiple gear modules evenly distributed in the circumferential direction, all the gear modules are fixedly connected with the fixing disc, the outer edges of the gear modules are spliced to form a complete wheel flange, an adjusting body is arranged at the joint between every two adjacent gear modules, and theadjusting bodies are made of variable-rigidity flexible materials; and the gear further comprises a sensor module and an intelligent control system, wherein the sensor module is used for directly sensing and measuring meshing state parameters of the gear and sending the parameters to the intelligent control system, and the intelligent control system is used for processing the parameters sent by the sensor module and controlling the variable-rigidity flexible materials of the adjusting bodies to be subjected to rigidity-flexibility and deformation conversion according to an optimization instruction obtained through processing. According to the provided novel intelligent gear, real-time gear meshing performance monitoring and dynamic gear meshing performance adjusting are integrated, and a closed loop, from meshing performance monitoring to meshing performance adjusting, of the gear is achieved.

A continuous kneading device (1) includes a pair of kneading rotors (3), being capable of increasing mesh between the kneading rotors (3) while suppressing a kneading load applied to the kneading rotors (3). The continuous kneading device (1) includes a barrel (2) and a pair of kneading rotors (3) housed in the barrel (2) and rotating in mesh in directions different from each other. Each kneading rotor (3) includes a plurality of kneading flights (11, 15) for kneading a material supplied into the barrel (2). The kneading flights (11, 15) and respective portions of the barrel (2) housing the kneading flights (11, 15) respectively configure a plurality of kneading sections aligned axially of the kneading rotors (3). The material is fed axially from the upstream kneading section to the downstream kneading section to be sequentially kneaded. The kneading flight (15) constituting the downstream kneading section has a rotational outer diameter (D2) larger than a rotational outer diameter (D1) of the kneading flight (11) constituting the upstream kneading section.

The invention discloses a fixing device used during operation. The fixing device comprises a placement plate, wherein one side of the placement plate is symmetrically provided with two supporting plates, the ends, away from the placement plate, of the two supporting plates are connected through a mounting plate, a first threaded rod is inserted in the mounting plate, the mounting plate is providedwith an insertion port corresponding to the first threaded rod, the first threaded rod is in threaded connection with the inner side wall of the insertion port, one end, close to the placement plate,of the first threaded rod is rotationally connected with a mounting block, one side, away from the first threaded rod, of the mounting block is symmetrically provided with mounting grooves, the innerside walls of the mounting grooves are rotationally connected with arc-shaped clamping plates through first rotating shafts, the sides, away from the first rotating shafts, of the arc-shaped clampingplates are rotationally connected with first sliding blocks through turnbuckles, and the supporting plate is provided with first sliding grooves corresponding to the first sliding blocks. The fixingdevice used during the operation has the advantages that the structure is simple, the use is convenient, the fixing effect on the trunk of a patient is ensured, and it can be avoided that the patientis hurt by clamping.

The invention belongs to the field of mechanical manufacture and relates to an assembling device and an assembling method for gearbox double-shaft assemblies of a tractor. The assembling device comprises a body component (9), two sets of guide components (10), a locating component (11), a hoisting hook component (12) and a pre-installing component (13). The locating component (11), the guide components (10) and the hoisting hook component (12) are fixedly connected to the body component (9) to form a fixedly connected 'integral assembly'. According to the assembling device and the assembling method for gearbox double-shaft assemblies of the tractor, when the double-shaft assemblies conduct assembly in a casing of a power shifting gearbox in an arranging mode, mesh gears between the double-shaft assemblies are in the normal mesh state, collision mechanical damage produced on the mesh faces of the gears is avoided, and it is further ensured that the double-shaft assemblies are accurately aligned when the double-shaft assemblies fall down, so that seal rings at the shaft ends are prevented from being cut, scratched and damaged. In addition, the assembling device is novel in structure, the assembling method is easy to implement and has good use value.

The invention discloses a wind driven generator transmission mechanism adopting chain wheels for speed increasing, and belongs to the field of wind driven generators. The wind driven generator transmission mechanism structurally comprises a high-speed shaft, a low-speed shaft, multi-row small chain wheels, multi-row large chain wheels and the like; multi-row sleeve roller chains are arranged between the multi-row small chain wheels and the multi-row large chain wheels, wheel teeth of the multi-row small chain wheels are surrounded by odd-number-row engaging circumferences of the multi-row sleeve roller chains, the even-number-row sleeve roller chains of the multi-row sleeve roller chains are in the mid-air suspending state on the multi-row small chain wheels, and therefore the multi-row small chain wheels are mounted on the high-speed shaft, the multi-row large chain wheels are mounted on the low-speed shaft, and the speed increasing transmission relation is formed by engaging of the multi-row large chain wheels and the even-number-row chains of the multi-row sleeve roller chains; through the chains, the transmission mechanism with the wind driven generator high-rotating-speed requirement is achieved, the engaging state is good, and on the basis of keeping the use advantages of chain transmission, the beneficial effects of being simple in structural design, capable of reducing complexity of the wind driven generator speed increasing transmission mechanism and the manufacturing cost of a wind driven generator, convenient to maintain and the like are achieved.