104 results about "Differential screw" patented technology

The object of the present invention is to convert a rotary motion into a linear motion more precisely than ever by utilizing the principles of a planetary gear mechanism and a differential screw. The rotary / linear motion conversion device of the present invention has a screw shaft 20, a plurality of planetary screw rollers 36 mating with the screw shaft therearound, and a roller nut 24, with the screw shaft 20 and the planetary screw rollers 36 mating with one another by threads of opposite winding directions, while the planetary screw rollers 36 and the roller nut 24 mate with one another by threads of a same winding direction, wherein the respective threads are of a common pitch, and the number of co-extending threads of either of the screw nut and the roller nut is varied from that which satisfies the condition that neither of the screw shaft nor the roller nut moves linearly relative to one another in spite of a relative rotation thereof along with rotation and revolving of the planetary screw rollers relative to the screw shaft and the roller nut with no slippage.

A motor-operated valve (1) has a rotor unit (60) in a can (30), and is rotationally driven by a stator unit (40). The rotation of the rotor unit (60) is transmitted to a screw feed member (70). A stem member (110) fixed to a valve body (10) is engaged threadedly with the screw feed member (70) by a first screw portion (S1). At the same time, the screw feed member (70) is engaged threadedly with an external thread portion (160) fixed to a valve stem (120) by the second screw portion (S2). The first screw portion (S1) and the second screw portion (S2) constitute a differential screw mechanism, and feeds the valve stem (120) according to a difference in pitch.

The invention relates to a device and a method for measuring the pretightening force of a main cone of a loader based on differential speed tightening, which is characterized in that the measuring device is provided with a work top, a sleeve, an inner spline, a transmission line 1, a transmission line 2, and a pretightening moment measuring mechanism, wherein the work top is taken as a preassembling bench of the main cone and a bearing pedestal and a bearing pretightening moment measuring bench; the sleeve is matched with an opening of a locknut and used for screwing up the locknut; the inner spline is matched with an outer spline on the tail of the main cone and used for driving the main cone to rotate; the transmission line 1 takes a servomotor as a driving piece and the inner spline as a driven piece; and the transmission line 2 takes a servomotor as a driving piece and a sleeve as a driven piece. The method adopts the means of differential speed tightening to well realize detection of the starting friction torque.

The invention discloses a differential screw hole-making device and a method, belonging to the technical field of flexible machining equipment. The device mainly comprises a differential screw feeding mechanism, a rotating mechanism and a radial deviation adjusting mechanism, wherein the differential screw feeding mechanism realizes the screw motion of a cutter bar; the rotating mechanism drives the cutter bar to rotate; and the radial deviation adjusting mechanism adjusts the deviation of the cutter bar relative to the axis of a support sleeve. The method is characterized in that during hole making, the screw motion of the cutter bar is controlled by the differential screw feeding mechanism, and the rotation of a cutter is realized by the rotating mechanism. Through the radial deviation adjusting mechanism, the cutter bar can be adjusted according to the aperture of the hole to be made relative to the revolution radius of the support sleeve, and the axial feeding can be realized easily through the addition of the differential combination screw. Therefore, the device and method can be used for mass production of hole making for difficult machining materials such as titanium alloy and carbon fiber reinforced composite materials. In addition, the device has high degree of integration and light weight, and can be used as a tail end execution unit of an automatic hole-making system of a robot. The device and method can greatly improve the hole-making quality and efficiency of parts difficult to machine.

An arrangement for transforming a planar support (2) includes first and second rotating cylindrical transformation tools (16, 17), cooperating to convert the support (2), first and second side bearings (26, 27), holding the first tool (16) for rotation (Rs), third and fourth side bearings (29, 31), holding the second tool (17) for rotation (Ri), spacers (43, 44, 46, 47) having an inclined face (48) and slidable (S) to adjust the respective distances (e, e1, e2) between the first and third bearings (26, 29) and between the second and fourth bearings (27, 31), to set a radial gap (20) between the two tools (16, 17). In another solution, either as an alternative to or in cooperation with the first solution, the spacer (43) is moved (S) by a differential screw (57) having a first thread (58) that engages with a tapped hole (59) in an integral part (61) of one of the bearings (29) and a second thread (62) different than the first thread (58) and engaging with a tapped hole (63) in the spacer (43).

A micro-adjustable differential screw assembly for providing fine adjustment of the axial and / or radial position of a cutting insert is disclosed. The micro-adjustable differential screw assembly can be mounted directly to a boring bar or to a mounting cartridge, which in turn, can be mounted to the boring bar. An axial micro-adjustable differential screw assembly provides fine adjustment of an axial position of the cutting insert, while a radial micro-adjustable differential screw assembly provides fine adjustment of a radial position of the cutting insert. The differential screw assembly includes a rotatable drive screw with threads of different thread pitches, and a non-rotatable adjusting screw with threads for mating with the drive screw. The difference in the thread pitches of the drive screw causes a greatly reduced axial and radial movement of the boring cartridge in relation to the relative movement of the drive screw, thereby providing fine adjustment in the axial and radial position of the cutting insert.

A milling tool holder having a spindle with a tapered opening and a tool holder having a tapered shank that fits into the spindle opening. The narrow end of the shank has a split collar. The spindle is joined to the tool holder by inserting the shank into the tapered opening and drawing the two components together using a differential screw. When the differential screw is turned in one direction, the two components are drawn together, and when turned in the opposite direction, the two components are separated. As the shank bottoms in the tapered opening, an annular enlargement on the differential screw expands the split collar of the shank to tightly seat the shank in the spindle.

A motor-operated valve has a rotor unit in a can, and is rotationally driven by a stator unit. The rotation of the rotor unit is transmitted to a screw feed member. A stem member fixed to a valve body is engaged threadedly with the screw feed member by a first screw portion. At the same time, the screw feed member is engaged threadedly with an external thread portion fixed to a valve stem by the second screw portion. The first screw portion and the second screw portion constitute a differential screw mechanism, and feeds the valve stem according to a difference in pitch.

The invention relates to a connecting rod lifting and overturning device based on differential screw transmission and rocker slider transmission. The device is characterized in that the center of a differential screw penetrates through a lead screw axle base, two ends of the differential screw are matched and assembled with a left bearing assembly and a right bearing assembly, and a left thread section and a right thread section of the differential screw are screwed into a left drive nut and a right drive nut respectively to form a differential screw mechanism; upper table-boards of lifting slide guide rails and lower table-boards of sliders are matched and assembled; shaft assemblies are connected with the sliders and an overturning frame, one end of each overturning connecting rod is fixed with the overturning frame, and the other end is fixed or separated from with support frames through fixing pin shafts and pin clamp plates; connecting rods, the sliders and the support frames constitute a rocker slider mechanism I, and rockers swing to drive the sliders to move up and down along the lifting slide guide rails; the sliders, the overturning frame, the overturning connecting rods and the support frames constitute a rocker slider mechanism II, and the sliders linearly move up and down to drive the overturning frame to perform overturning movement. The connecting rod lifting and overturning device based on differential screw transmission and rocker slider transmission has lifting and overturning functions simultaneously, is more compact in structure, convenient to operate and good in stability, and saves confined space.

The invention relates to the technical field of mechanical sealing, in particular to a device for measuring elastic deformation limiting displacement and maximum static friction force of a sealing ring. The device comprises a workbench, a bottom plate, a positioning block, a strut, a nut, an abrasion resisting sleeve, a threaded sleeve, a lead screw, a force sensor, a displacement sensor, a reflecting plate, a sliding block, a shaft, an end cover, a support, a supporting shaft, a first tested seal, a second tested seal and a positioning key. The quasi-static micro-amplitude reciprocating movement of the sealing ring is achieved through a differential screw mechanism, the force and displacement relation under multiple working conditions is measured through the force sensor and the displacement sensor, and the changing process of the conversion from the static friction to sliding friction of the sealing ring is studied. The kick phenomenon is adopted, and the limiting displacement and the maximum static friction caused by elastic deformation of the sealing ring are measured. According to the device, the vacancy related to the mechanical property experiment study of the sealing ring under the micro displacement is filled up, and auxiliary seal mechanical property experiment data and design references are provided for a mechanical sealing system.

The invention discloses a main core nut differential screwing mechanism of a drive axle assembly. The main core nut differential screwing mechanism of the drive axle assembly is characterized in that a first transmission line is arranged and enables a first servo motor to transmit torque to a main cone locking nut through a torque sensor, a spline hub, a spline shaft and a sleeve in sequence; a second transmission line is arranged and enables a second servo motor to transmit torque to a main cone input flange through a driving gear, a driven gear, a transition flange plate, a rotating shaft sleeve and a rotation-stopping claw in sequence; the arranged sleeve and the arranged rotation-stopping claw rotate at the same differential, so that differential screwing of the main cone nut is achieved. The main core nut differential screwing mechanism of the drive axle assembly can achieve real-time adjustment, save assembly time and improve the assembly efficiency.

The invention discloses a cable net reflecting surface developable antenna thread differential motion cable length adjusting device and adjusting method. The device comprises a differential screw barrel, internal threads with different thread pitches and the opposite turning directions are arranged at the two ends of the inner wall of the differential screw barrel, external threads matched with the internal threads at the two ends of the inner wall of the differential screw barrel are arranged on a pair of adjusting screw rods respectively, the adjusting screw rods are screwed into the two ends of an inner cavity of the differential screw barrel, and small holes in the direction of the axes of the adjusting screw rods are formed in the stretching ends of the adjusting screw rods respectively. A compression spring is arranged between the inner end faces of the adjusting screw rods inside an inner cavity of the differential screw barrel. Differential screw barrel scales are evenly distributed on the outer wall of the two ends of the differential screw barrel respectively, and adjusting screw rod scales are arranged at the stretching ends of the adjusting screw rods respectively. The cable length is adjusted fast and precisely in a thread differential driving mode. The device has the advantages of being simple in structure, having multiple adjusting modes, and being convenient to use.

The present invention provides a pre-tightening device and pre-tightening method of piezoelectric ceramic drivers in a fast reflecting mirror system. The objective of the invention is to eliminate a defect that only a single constant unknown pre-tightening force can be applied in the prior art. The device includes a plurality of sets of differential fine-tuning locking assemblies and displacement sensors which are consistent with the piezoelectric ceramic drivers in number; each set of differential fine-tuning locking assembly includes a differential screw rod, a contact block and a locking jackscrew, wherein the differential screw rod is installed on a fast reflecting mirror seat in a matched manner through screw threads, the contact block is located between the hemispherical tip of the top of a corresponding piezoelectric ceramic driver and the differential screw rod, the upper end of the contact block is in matched connection with the differential screw rod through screw threads, the differential screw rod drives the contact block to move up and down, and the locking jackscrew is used for locking the contact block so as to prevent the contact block from shifting up and down; and the displacement sensors are arranged at positions which are adjacent to the contact blocks and the hemispherical tips and are used for feeding back the displacement change quantity of points to be measured of the mirror seat under the driving of the piezoelectric ceramic drivers. With the pre-tightening device and pre-tightening method of the invention adopted, pre-tightening forces can be applied to the piezoelectric ceramic drivers under quantitative control.

The invention provides a method and a device for detecting radial runout of a lathe spindle in a machining state. The device comprises a host computer, a core rod absorbing and holding assembly and a dynamic adjusting and testing assembly, wherein the core rod absorbing and holding assembly is fixed on a to-be-machined round bar, and the core rod is absorbed on smooth tempered glass by a strong magnet; the dynamic adjusting and testing assembly is mounted on a bracket with a laser displacement sensor and a nylon push block as cores; the bracket can be arranged at any static part of a lathe body by a magnet base. When the radial runout of the lathe spindle is measured in the machining state, the nylon push block is driven by a differential screw mechanism to push the core rod on the tempered glass, meanwhile, displacement signals of the core rod during rotation are picked by the high-precision laser displacement sensor and transmitted to the computer for processing and displaying, fine adjustment is performed until a peak-to-peak value of a measured value is the minimum, and eccentricity is eliminated once; the measured value is filtered by the host computer, measurement signals with the same frequency as rotating speed are eliminated, and a finally obtained variable range of the measured value is the radial runout affecting machining quality.

The invention discloses a differential micro-adjustment height gauge, wherein a differential micro-adjustment mechanism is mounted on the ruler body 1 of a ruler, the differential micro-adjustment mechanism comprises a side force constanting device 2, a differential sleeve 3, a fixed internal thread cylinder 4, a micro-motion ruler frame 6, a fixing nut 7 and a differential screw rod 8, wherein the micro-motion ruler frame is mounted on the ruler body 1 through a spring copper sheet and can slide on the ruler body 1, the fixed internal thread cylinder 4 is arranged on the micro-motion ruler frame 6, the differential sleeve 3 is mounted at the upper end of the fixed internal thread cylinder 4, the side force constanting device 2 is mounted at the upper end of the differential screw rod 8 internally arranged inside the fixed internal thread cylinder 4, and the lower end of the differential screw rod 8 is connected with the fixing nut 7. In the invention, the principle of a differential screw pair is used for fine adjustment of dimensional precision, and the differential micro-adjustment height gauge has a simple structure, is convenient to use, and is high in measuring accuracy.

The invention discloses a precision fine adjustment device, and particularly relates to a differential screw fine adjustment device. The device consists of a pedestal, a guide rod, a guide plate, a screw rod, a bolt and an adjusting screw sleeve, wherein a threaded through-hole and a light through-hole are formed on the pedestal and penetrate the pedestal in the up-down direction, the adjusting screw sleeve has a sheath structure, an external thread is formed on the outer cylindrical surface of the adjusting screw sleeve, an internal thread is formed on the inner cylindrical surface of the adjusting screw sleeve, the external thread is in threaded connection with the threaded through-hole to form a pair of screw pairs, the internal thread on the adjusting screw sleeve is in threaded connection with the screw rod, the internal thread and the external thread of the adjusting screw sleeve have the same rotation direction but have different pitches, and the screw difference of the two screw pairs is the fine adjustment distance resulting from one rotation of the adjusting screw sleeve. The differential screw fine adjustment device has simple structure and reasonable design, is easy to operate, can achieve the effect of precision fine-adjustment because of the small real linear displacement caused by differential motion, provides convenience for differential fine adjustment, ensures reliable position fixation and high precision, and has a wide application range.

The invention discloses a rotary type banana crown cutting device. The device comprises a banana ear lifting mechanism, a stalk clamping mechanism and a rotary type crown cutting tool. A Stalk of a banana ear is clamped through the stalk clamping mechanism, the banana ear is controlled under the action of the banana ear lifting mechanism to move downward, then rotary type crowning cutting of bananas can be conducted by the rotary type crown cutting tool, and the bananas obtained after crown cutting are conveyed to a sterilizing and cleaning device through a banana crown conveying mechanism. Meanwhile, the stalk clamping mechanism controls a rubber claw of the stalk clamping mechanism to clamp the stalk of the banana ear through differential screw transmission so as to achieve the aim of quickly clamping the stalk of the banana ear, and the clamping mechanism has the clamping and self-locking functions. A motor of the banana ear lifting mechanism is a brake motor, a motor shaft does not rotate under the outage condition, so that the lifting mechanism has the advantage of self-locking, and the operation safety in the processes of clamping and banana ear ascending and descending is ensured. The whole device is compact in structure, high in efficiency, high in precision, small in loss, low in mass and convenient to move, mechanical crow cutting is easily conducted on the bananas, and the operation is safe and saves labor.

The invention discloses a full-automatic necking-in device for a high lock nut. The device comprises a frame and a vibrating plate, a direct vibrator, a stopping and separating mechanism, a station manipulator, a necking-in functional unit, a control box, an electric box and a receiving box which are arranged on the frame, wherein the high lock nut is transferred from the vibrating plate to the direct vibrator and then to the stopping and separating mechanism in turn; the station manipulator comprises a cross beam which can move up and down as well as left and right; claws are respectively arranged at the left and right ends of the cross beam; the necking-in functional unit comprises a mounting flange, a clamping plate, necking-in press heads, a pressure sensor, a differential screw adjusting mechanism, a lifting adjusting device and a motor; at least two necking-in press heads are uniformly distributed on the circumference of the clamping plate; and arc-shaped pressing notches are arranged at the front end of the necking-in press heads and are used for necking-in the high lock nut which is clamped between the arc-shaped pressing notches in a necking-in process. The full-automatic necking-in device for the high lock nut has the advantages of compact structure, convenience in operation, reliability in use and high efficiency. The end product of the high lock nut after being necked-in is excellent in use property and is difficult to crack.

The invention discloses a differential screw hardness measuring device, and overcomes the problem that the conventional hardness measuring device cannot be compact in structure, long in service life, accurate in measurement and low in cost at the same time. The differential screw hardness measuring device is characterized in that: the lead of a first thread at the lower end of a double-thread screw is P1, the lead of a second thread at the upper end is P2, and the P1 minus the P2 equals to delta P which is a relatively small numerical value; a first nut is arranged outside the first thread; the first nut is fixedly connected with the upper end of an inner sleeve; the lower end of the inner sleeve is fixedly connected with a force sensor; a second nut is arranged outside the second thread; the second nut is fixedly connected with the upper end of an outer sleeve; a tiny displacement distance is formed at the meshing position of a first driven gear and a second driven gear with a driving gear. The differential screw hardness measuring device has the following benefits: relatively small displacement can be generated through adopting a screw with a relatively large lead, so that the contradiction among accurate measurement of indentation depth residual increment, strength of screws and nuts and service life is solved; besides, a displacement sensor is avoided, so that the whole system is simpler in structure, low in cost and high in reliability.

A force applicator assembly (10; 10') is disclosed to calibrate an in-situ force transducer (or load cell) (104) in a force (load) applying test machine (125). The force applicator (10) includes stationary member (22; 22') configured to be secured to fixed structure, a moving member (20; 20'), a load cell (12) operably coupled to an end of the moving member (20; 20'); and a differential screw assembly (24; 24') connecting the moving member (20; 20') to the stationary member (22; 22'). A coupling assembly (14) can be used to assure that only tension or compression loads are applied. The coupling assembly (14) can be configured if desired such that no tension or compression loads can be applied. A method to calibrate an in-situ force transducer (104) in a force applying test machine (205) is also provided and uses a force generator (16; 16'; 125) and the coupling assembly (14).

The invention relates to a multiple cutting edge rotary tool having a radial individual adjustment of each cutting edge or having a central adjustment for all cutting edges together. The multiple cutting edge rotary tool used for machining has a number of holders that have, in the front part, cavities for accommodating cutting plates and have, in the area between their ends, a hole for passing through a fixing device with which each holder can be fixed to a support. The holder, on its portion that supports the cutting plate, can be elastically deflected in relation to a support by means of an adjusting device. In addition, the holder is provided with an opening and forms a parallel spiral spring arrangement whereby the cutting plate, during its adjustment, is essentially subjected to a parallel displacement with regard to the cutting edge. The adjusting device is provided in the form of a central adjusting screw which, as an axially adjustable differential screw, retains, by means of a lifting motion of the differential screw, the holder in a manner that permits it to be radially displaced in relation to its support and without play. The retention of said holder is effected by adjustable pressure pieces that are supported on parts of the adjusting screw.

The invention discloses a long-gauge-distance strain sensor high-precision calibration frame which is composed of a front end plate, a back end plate and a middle fixing frame, wherein the front end plate and the back end plate are connected through the middle fixing frame. A fixing frame is arranged between the front end plate and the back end plate in a sliding mode. The fixing frame comprises a first dragging plate and a second dragging plate. A fixing rod is sleeved with the first dragging plate and the second dragging plate, and the first dragging plate is fixedly connected with the second dragging plate. A differential screw rod is connected with the second dragging plate. The other end of the differential screw rod is connected with a circular handle which is connected to the back end plate. Dial gauges and two clamps are arranged on the front end plate and the first dragging plate. 3 to 20 cushion block grooves are formed in the opposite surfaces of the two clamps. A sensor clamping cushion block is arranged in each cushion block groove, and each cushion block is a soft metal block. The long-gauge-distance strain sensor high-precision calibration frame has the advantages of being reasonable in structure arrangement, large in stiffness, adjustable in differential screw rod screw-in speed, high in control precision, firm and durable.

The invention discloses a thermal error differential screw compensating device comprising a screw rod nut drive system, a worm gear compensating system, and a fastening nut (18), wherein the screw rod nut (2) is fixedly connected with a first sleeve (3) by six first attachment screws (17) which are evenly distributed on the circumstance; a right bearing (6) and a left bearing (7) are installed on the first sleeve (3) to bear radial load and unidirectional axial load; the left bearing (7) utilizes the shaft shoulder of the first sleeve (3) and a second sleeve (11) to realize axial positioning; the right bearing (6) utilizes a third sleeve (5) and the shaft shoulder to realize axial positioning; the third sleeve (5) is connected with a machine tool stand column by six third attachment screws (9) which are evenly distributed on the circumferential direction; the second sleeve (11) is installed on the first sleeve (3) and is connected with the third sleeve (5) by six second attachment screws (10); a worm gear (15) in the worm gear compensating system is connected with the first sleeve (3) by a flat key (16); a motor coupled-type reducer engine base (13) is connected with the stand column by four fourth attachment screws (12); a motor coupled-type reducer (19) is connected with a worm (14) by a coupler (20); the motor directly drives the worm (14) to drive the worm gear (15) to rotate; and the fastening nut (18) are sued for axially positioning the worm gear (15) through screw thread.

The present invention relates to a mechanism for enhanced, bi-directional fine adjustment of cutting insert cartridges in machine tools. A cutting insert cartridge for chip removing machining tools has an axial adjustment system threadedly engaged with a cartridge body and a tool body. The axial adjustment system includes a differential screw in threaded engagement with the tool body either directly, for example by threaded engagement with a threaded openingin the tool body, or indirectly, for example by threaded engagement with a cross dowel fastener slidably positioned in an opening in the tool body. Actuation portion positioned axially between threaded end portions of the differential screw has an engagement feature on an outer surface to be driven, e.g., with a tool or by hand, to rotate the differential screw and adjust the axial position of the cartridge. The spaced apart relationship improves access to the actuation portion and engagement feature for rotation of the differential screw. Chip removing machining tools with such cartridges, methods of adjusting the position of the cartridge and cutting insert adjustment differential screws are also disclosed.

The invention aims to provide a clothes airing device for a balcony. The device comprises a lifting mechanism and an airing mechanism; the lifting mechanism comprises a motor and a wire wheel, the motor is connected with and drives a worm, the worm is matched with a worm gear connected to the wire wheel by a coupler, the left and right sides of the wire wheel are respectively provided with a first fixed pulley and a second fixed pulley, a rope sequentially winds through the first fixed pulley, the wire wheel and the second fixed pulley, the left end part of the rope is connected to a first connecting plate, the right end part of the rope is connected to a second connecting plate, and the motor, the wire wheel, the first and second fixed pulleys, the worm and the worm gear are all arranged on the ceiling of the balcony; the airing mechanism is respectively connected to the first and second connecting plates. According to the clothes airing device for the balcony, the transmission of the worm gear and the worm is adopted to realize the self-locking of the mechanisms; a differential screw mechanism is adopted, so that two clothes airing rods can be simultaneously loosened and clamped; two functions of airing a quilt and a clamping hanger are realized; the design is novel, the structure is simple and reliable, the control is easy, and clothes, the quilt, and the like are more suitable to air on the balcony.

The invention discloses a constant-force self-locking differential screw fine-tuning device which comprises a regulating body, a main connecting rod body and a secondary connecting rod body, wherein internal threads of the main connecting rod body and external threads of the secondary connecting rod body are respectively connected with external threads and internal threads of the regulating body to form a differential fine-tuning device. The constant-force self-locking differential screw fine-tuning device has a simple structure, is convenient for operation, consists of two threads with different thread pitches and has a constant-force self-locking performance and a differential screw fine-tuning function; the constant-force self-locking differential screw fine-tuning device can be used for accurately and finely tuning hole pitches at two ends of the connecting rod, keeping relative positions of central lines of holes at two ends of the connecting rod constant to automatically meet the precision requirement of mounting position on a member or a part, automatically eliminating the axial clearance of a thread pair and realizing locking at constant force. According to the constant-force self-locking differential screw fine-tuning device, the defects that the hole pitches and the parallism at two ends of the connecting rod cannot be adjusted and self locked at constant force by using the traditional connecting rod adjusting device are made up.

A telescopic differential screw mechanism based 3-DOF Parallel Manipulator system to enable differential length and omnidirectional bending is provided. The telescopic differential screw mechanism based 3-DOF Parallel Manipulator system includes a first circular rotating plate 102, a second circular rotating plate 104, three or more telescopic screw assemblies 106A-C and three or more actuators 108A-C. Each telescopic screw assembly 106 includes a pair of master screws 110, a pair of successive screws 112 and a universal joint 116. The three or more telescopic screw assemblies 106A-C are actuated differentially using the three or more actuators 108A-C to achieve omnidirectional bending with high angular rotations in a range of 0 to 75 degree.

The invention discloses an injection device and an injection method of a miniature injection molding machine of differential transmission. The injection device mainly comprises an injection servo motor, a thread bushing, a drive nut, a driven lead screw, an injection plunger, a measuring and regulating device, a pre-molding device and the like, wherein the drive nut is fixedly connected with a rack together, the injection servo motor and the thread bushing are connected to directly drive the thread bushing to rotate, an outer thread of the thread bushing is matched with the drive nut to form a drive thread pair, an inner thread of the thread bushing is matched with the driven lead screw to form a driven thread pair, the drive thread pair and the driven thread pair are serially overlapped to form a differential screw mechanism, and the screw difference of the two thread pairs is the differential distance generated by rotating the thread bushing for one circle. The invention provides the injection device and the injection method of the miniature injection molding machine of differential transmission, solving the problem that the miniature injection amount and the injection precision are difficult to control in a miniature injection molding process. The injection device is simple in structure, easy to manufacture and convenient and efficient to control, and is suitable for injection forming of a precise miniature plastic product.