566 results about "Transmission ratio" patented technology

The invention discloses a winding drum rope arranging device which comprises a winding drum base, a winding drum, a gear transmission mechanism, a lead screw, a swing roller assembly, a convex shaft and a reversing assembly. The reversing assembly comprises a power assembly and a reversing clutch assembly. The gear transmission mechanism and the lead screw convert rotary motion of the winding drum into linear motion of the swing roller assembly, so that the winding drum moves along with the rope coiling position. When the winding drum is full of one layer, the swing roller assembly reaches the limit deviation position to drive the protruding shaft to rotate, the power assembly amplifies the rotation angle and conducts one-way transmission, and the reversing clutch assembly changes the rotation direction of the lead screw to achieve reversing. A pure mechanical structure is adopted, a sensor and an electric control system are not needed, reliability is high, and cost is low; the swing roller assembly reduces abrasion of the steel wire rope and limits the support to guarantee accurate movement; rope arrangement synchronization is achieved through the transmission ratio design, the reversing assembly has the precise reversing function and the torque protection function, the rope disorder and rope sinking phenomena can be effectively avoided, and the service life of the steel wire rope is prolonged.

A gearing assembly (12) for a brake actuator (10), comprising the following features:a drive element (33),a first driven element (36),a second driven element (38), anda gearing output element (40),wherein, with respect to the drive element (33), the first driven element (36) has a different transmission ratio than the second driven element (38),wherein the first driven element (36) can be coupled to the gearing output element (40) by a first clutch (42), which comprises a first drive body (50) and a first driven body (52), andwherein the second driven element (38) can be coupled to the gearing output element (40) by a second clutch (46), which comprises a second drive body (62) and a second driven body (64) and is designed as an overrunning clutch,and a brake actuator (10) comprising a gearing assembly (12).

The present application relates to the technical field of speed reducer, especially to a hollow composite planetary speed reducer, which comprises a machine shell, an input shaft rotatably connected to the machine shell, a sun gear fixedly connected to the input shaft, an outer gear ring installed in the machine shell, three planetary gears meshing between the outer gear ring and the sun gear, a planetary carrier rotatably connected to the three planetary gears, a worm fixedly connected to the planetary carrier, a rotating shaft rotatably connected to the machine shell, a worm wheel meshing with the worm and fixedly connected to the rotating shaft, and an output shaft rotatably connected to the rotating shaft. The present application combines the planetary speed reducer with the worm and worm gear speed reducer to form a composite speed reducer, which solves the self-locking defect of the planetary speed reducer and the low efficiency problem of the worm and worm gear speed reducer, and realizes secondary speed reduction, thereby increasing the transmission ratio and reducing the overall size of the device, improving the working efficiency and safety of the speed reducer.

The present invention relates to a transmission device for a steering system. The steering system includes a transmission unit with a rotatable first gear element, which may be driven by a drive. The steering system also includes a rotatable second gear element, which is operatively connected to the first gear element for transmitting the drive movement as a function of a transmission ratio between the first and second gear elements. A monitoring unit is further included for monitoring the transmission unit with a detection means for detecting an actuated rotational position of the transmission unit when transmitting the drive movement within a predefined rotational range. The invention also relates to a steering system, a method, and a computer program product.

The invention discloses a tractor tilling depth adjusting method and device, and belongs to the technical field of agricultural machinery. The method comprises the steps that the transmission speed ratio is determined according to the wheel rotating speed and the engine rotating speed of the tractor; determining the output power of the engine according to the engine speed; according to the engine rotating speed, the output power, the accessory consumption power and the transmission speed ratio, the maximum traction force capable of being provided by the tractor is determined; the tilling depth of the plough is adjusted according to the pulling force of the plough on the tractor, the maximum traction force and the set tilling depth. According to the embodiment of the invention, the tilling depth can be automatically adjusted according to the load change in the tilling operation process of the tractor, the problem of serious speed reduction of an engine is avoided, the tilling depth adjusting efficiency is improved, and the tilling operation efficiency is improved.

The invention discloses a gear transmission return difference dynamic measurement method and system based on double encoder difference, and belongs to the technical field of precision measurement and transmission control, and the method comprises the steps: respectively installing encoders on an input shaft and an output shaft of a gear transmission chain, and synchronously collecting and obtaining an angle data sequence through nanosecond timestamps; a recursive least square algorithm is adopted to calibrate the transmission ratio in real time; extracting an equivalent return difference angle through phase difference residual step detection at a speed reversing moment; establishing a multiple regression model of the return difference, the rotating speed, the load and the temperature; according to the method, the technical problem that the dynamic return difference characteristic under the variable load and variable speed working condition cannot be accurately represented by a traditional static measurement method is solved, the measurement precision is superior to 1 arc second, and the return difference compensation effect reaches 80% or above.

The invention relates to the field of motor control and adjustment, in particular to a motor rotating speed adjusting method and system for a remote control driving vehicle, and the method comprises the steps: obtaining and preprocessing vertical, transverse and longitudinal vibration signals and running speed data of each wheel of the vehicle; extracting a vibration anomaly feature sequence and an average vehicle speed sequence through a sliding window method, and analyzing correlation to quantify road condition features; quantizing the wheel cooperative stability based on the wheel vibration correlation and the transverse / vertical energy ratio difference degree, and fusing the maximum road condition feature value and the stability mean value to obtain a rotating speed adjustment factor; the actual target rotating speed of the motor is calculated by combining the preset vehicle speed, the transmission ratio and the like, and precise vehicle speed adjustment is achieved through PID closed-loop control. According to the method, the rotating speed adjusting factor is constructed by quantifying the three-dimensional road condition characteristics and the vehicle dynamic stability, real-time adaptive adjustment of the vehicle speed is achieved in combination with PID closed-loop control, and the safety and stability of remote control driving are remarkably improved.

A control device for a human-powered vehicle has an electronic controller that controls a motor that applies a propulsion force to the human-powered vehicle to assist a human driving force. The human-powered vehicle includes a transmission device. The electronic controller is configured to assist in propulsion of the human-powered vehicle with the motor in a state in which the human-powered vehicle is propelled by the human driving force. In a case where a transmission ratio of the transmission device is changed, the electronic controller decreases an assist level of the motor in accordance with the human driving force input to the human-powered vehicle, and controls the motor so that the assist level is greater for a case where the human driving force is a first human driving force than the assist level for a case where the human driving force is less than the first human driving force.

The invention discloses an assembling structure and method for a pure electric steering gear with double speed reducing mechanisms, and relates to the technical field of pure electric steering gear. According to the structure, a speed reducing shell and a motor controller are arranged on a steering gear shell, and a first-stage speed reducing mechanism composed of a small gear and a large gear is sequentially arranged in the speed reducing shell; one end of the worm is connected with the large gear through a transmission balance shaft, and a spring and a bearing are arranged in the transmission balance shaft to achieve radial elastic supporting and mechanical balance. The assembling method is carried out according to the sequence of the self-adaptive adjusting assembly, the worm, the transmission balance shaft, the speed reduction shell, the steering gear shell and the motor controller, and through a rotation test, the meshing clearance of the gear pair and the worm and gear pair is subjected to self-adaptive compensation by utilizing elastic deformation of a spring and a rubber element. Under the condition of a single motor, a large total transmission ratio and a large steering output torque are obtained, and meanwhile transmission stability, noise vibration performance and long-term use reliability are considered.

The utility model relates to the technical field of ring main unit running-in test equipment, and discloses a manual-automatic running-in device of a ring main unit switch operating mechanism, which comprises a mechanism main body, a gear transmission group, a driving device, an operating handle, a cam, a fixed shaft and a travel switch which are mutually combined for use to play a role, so that a manual-automatic combined running-in mode is realized. A driving device does not need to be in direct butt joint with the operating mechanism, transition is carried out through the gear transmission set, and when different torques of the operating mechanisms of the ring main units of different models are applied, only the gear transmission ratios of the driving output structure, the manual output structure and the transmission gear structure in the gear transmission set need to be changed, and the ring main units of different models can be adapted. The driving equipment does not need to be frequently replaced, and the manual operation can be performed by adopting a manual output structure in case of power failure or failure of the driving equipment without depending on the driving equipment.

The application discloses a kind of drive-by-wire steering control method, device and electronic equipment, it is related to intelligent automobile field.The method comprises: obtaining the steering parameter of vehicle, wherein the steering parameter is the steering transmission ratio between steering wheel and tire;According to the steering parameter of vehicle, the steering signal of steering wheel is converted into the desired steering angle of vehicle;Based on the desired steering angle, the desired wheel speed of each wheel of vehicle is calculated, and the wheel speed control is carried out to each wheel of vehicle according to the desired wheel speed of each wheel.Based on the above method, the desired wheel speed of each wheel of vehicle is realized by calculation desired steering angle, and the wheel speed of each wheel of vehicle is further adjusted according to the desired wheel speed of each wheel of vehicle, so as to realize the drive-by-wire steering based on wheel speed control, to ensure that backup steering system can realize the steering control of vehicle when main steering system fails.

The embodiment of the invention discloses a vehicle control method and device, a storage medium, a product and a vehicle, and the method comprises the steps: detecting a communication state or a function state between an upper steering assembly and a lower steering execution assembly of the vehicle; when it is detected that the communication state is interrupted or the function state is invalid, an emergency steering function hard switch and a steering knob device are activated; special communication connection between the emergency steering function hard switch and the steering knob device is established through the emergency steering function MCU; receiving a target steering angle instruction sent by the emergency steering function hard switch and the steering knob device through the special communication connection; based on the target steering angle instruction and a preset up-down rotation transmission ratio, a target execution angle of a vehicle down-rotation execution assembly is obtained through calculation; and the driving current is output to the power-assisted motor through the emergency steering function MCU, so that an execution assembly of the vehicle is driven to rotate to the target execution angle through the power-assisted motor, and the running speed of the vehicle is controlled not to exceed the preset safe vehicle speed.

The invention discloses a multi-speed steering system, a control method and a wheeled vehicle, the system comprises an input shaft, an output shaft, a four-wheel drive clutch and a multi-speed steering clutch, the four-wheel drive clutch and the multi-speed steering clutch are coaxially arranged on the input shaft, and when the four-wheel drive clutch is in a combined state, power of the input shaft is transmitted to the output shaft at a first transmission ratio; when the multi-speed steering clutch is in the combined state, the power of the input shaft is transmitted to the output shaft at a second transmission ratio, and the second transmission ratio is smaller than the first transmission ratio; the combination state of the four-wheel-drive clutch and the multiple-speed steering clutch is configured to be in one-to-one correspondence with the two-wheel-drive mode, the normal four-wheel-drive mode, the multiple-speed steering mode and the fault four-wheel-drive mode of the system. The transmission efficiency, the reliability and the working condition adaptability can be remarkably improved while the steering flexibility and the traction force are guaranteed.

A double-control fault-tolerant control method, system and device for steer-by-wire and a storage medium relate to the field of automobile steer-by-wire, and specifically comprise the following steps: when a mainboard is detected to have a slight fault, the control right is switched from the mainboard to a slave board, and the mainboard is controlled to be restarted; in the slave plate control stage, a first real-time transmission ratio corresponding to a slave plate is determined based on real-time parameters, and the real-time parameters comprise the real-time vehicle speed and the real-time steering angle rate; after the main board is restarted, the main board receives the real-time parameters sent by the slave board and calculates a second real-time transmission ratio corresponding to the main board; and whether consistency verification of the torque and the transmission ratio is carried out or not is judged based on the real-time parameters, and switching control over the control right is carried out according to a consistency verification result. According to the invention, stable back-switching of the main controller can be ensured.

A manual transmission (SG) for a vehicle (100) comprising a first shifting element (A), a second shifting element (B), a first planetary gear set (PS1) with a first sun shaft (SO1), a first ring gear shaft (HR1) and a first carrier shaft (ST1), and a second planetary gear set (PS2) with a second sun shaft (SO2), a second ring gear shaft (HR2) and a second carrier shaft (ST2), wherein the first planetary gear set (PS1) and the second planetary gear set (PS2) are radially nested, wherein the first sun shaft (SO1) and the second carrier shaft (ST2) are rotationally fixed, wherein the first ring gear shaft (HR1) and the second sun shaft (SO2) are rotationally fixed to a stationary component, wherein in the closed state of the first shifting element (A) a first gear with a first ratio is engaged, wherein in the first gear the second ring gear shaft (HR2) is configured as the input and the first carrier shaft (ST1) as the output,• wherein, in the closed state of the second switching element (B), a second gear with a second gear ratio is engaged, wherein in the second gear the second ring gear shaft (HR2) is configured as the input and the second web shaft (ST2) as the output.

The application belongs to the field of range hood, and discloses a control method and device of a range hood, computer equipment and a readable storage medium. The method comprises the following steps: acquiring a first motor rotating speed of a motor under the condition that the motor operates according to a reference current; determining a first fan wheel rotating speed of a second fan wheel according to the first motor rotating speed and a transmission ratio of a transmission mechanism stored in advance; inquiring a current corresponding to the first fan wheel rotating speed as a target current in a corresponding relationship between the current required by each flue resistance interval and the oil fume suction capacity of the fan wheel rotating speed interval, and controlling the motor to operate according to the target current. The application can enhance the oil fume suction capacity of the range hood.

[Problem] A transmission structure that may improve a traveling feeling when a drive traveling state is interrupted in traveling and then the drive traveling state is resumed is provided. [Solution] A control device actuates a clutch actuator so that only a clutch mechanism on a most downstream side in a transmission direction in a selected shift gear is brought to a disengaged state when receiving a power cut-off signal in a state in which a traveling state change member is subjected to a forward operation or a reverse operation, and, actuates the clutch actuator so that only the clutch mechanism on the most downstream side in the transmission direction in the selected presumed shift gear is brought to a disengaged state based on a traveling state, and in addition, actuates a gear shift actuator so that a gear ratio of a continuously variable transmission mechanism that realizes a vehicle speed at that time point in the presumed shift gear is obtained while the power cut-off signal is valid, and actuates the clutch actuator so that the clutch mechanism on the most downstream side in the transmission direction in the presumed shift gear at that time point is brought to an engaged state when a cancel signal for canceling the power cut-off signal is input.

Proposed is a two-stage reduction gear comprising a housing and, arranged inside said housing, gears connected to one another so as to transmit rotational motion. Said gears are provided in the form of a planetary stage and a ballscrew stage. The planetary stage comprises an input component and an output component, and the ballscrew stage comprises an input component and an output component. The output component of the planetary stage and the input component of the ballscrew stage form a single part. Also proposed is a hinge containing the claimed two-stage reduction gear. The result is an increase in torque transmission over a wide range of transmission ratios, together with a decrease in the size and weight characteristics of the reduction gear and an increase in resistance to shock loads.

The present invention relates to a method for operating a steer-by-wire steering system (1) in a motor vehicle, wherein the steer-by-wire steering system (1) comprises a steering handle (2) and a wheel steering actuator (3). For steering the motor vehicle, the steering handle (2) can be moved over an angular range (7, 70) with a starting position (4) in a first and a second direction (5, 6) with a first and a second virtual stop (8, 80; 9, 90), respectively. A steering angle (101) applied to the steering handle (2) is detected and converted by the wheel steering actuator (3) into a wheel steering angle of steerable wheels (18) of the motor vehicle.When the steering handle (2) is moved, a steering angle velocity (102) and a steering angle acceleration (103) are detected, and the initial position (4) is adjusted depending on the detected steering angle velocity (102) and the detected steering angle acceleration (103), whereby this adjustment influences a transmission ratio according to which the steering angle (101) is converted into a wheel steering angle of steerable wheels (18) of the motor vehicle. Furthermore, the invention relates to a steer-by-wire steering system (1) configured to be operated in a motor vehicle according to the aforementioned method, and to a motor vehicle with such a steer-by-wire steering system (1).

The invention relates to a method (100) for operating a pedal-driven vehicle (200), comprising at least one drive (201) for providing a drive torque (AM) for propelling the pedal-driven vehicle (200), a gearshift (202) for providing a variable transmission ratio, and a control unit (203), the method (100) comprising: - Providing (110) a first drive torque (AM1) at a first drive speed (N1) by the drive (201), - Providing (120) switching information for a planned switching operation, in particular by means of the gearshift (202), the switching information comprising a relief time indication, wherein the relief time indication is at least characteristic of a relief time (t Deload ), and - Adjusting (130) the drive torque (AM) and / or the drive speed (N) of the drive (201) provided by the drive (201) depending on the unloading time specification.

The present invention provides a control device for a human-powered vehicle that can suitably control the transmission. [Solution] The control device for a human-powered vehicle includes a control unit configured to control a transmission that changes the gear ratio, which is the ratio of the wheel rotation speed of the human-powered vehicle's wheels to the rotation speed of the crankshaft of the human-powered vehicle. The control unit is configured to control the transmission to change the gear ratio based on a gear condition relating to at least one of the wheel rotation speed and the crankshaft rotation speed. Even if the gear condition is not met, the control unit is configured to control the transmission to decrease the gear ratio if the human-powered driving force input to the crankshaft is greater than a threshold. The control unit is configured to set the threshold to a first threshold when the state of the human-powered vehicle is a first state, and to set the threshold to a second threshold different from the first threshold when the state of the human-powered vehicle is a second state different from the first state.

Hybrid powertrain (10) for starting and propelling a vehicle (8), comprising: a motor (12); a first motor / generator (14); a second motor / generator (16); and a single-stage, widely branched, electrically variable transmission (18) comprising the following: a drive element (52); a stationary element (54); a gear train (44); a torque transmission device (56); a compound planetary gear assembly (20) comprising a ring gear structure (24), a first sun gear element (26-1, 126-1, 226-1, 326-1), a second sun gear element (26-2, 126-2, 226-2, 326-2), a support structure (28), and a double pinion assembly comprising a first pinion gear (30-1, 130-1, 330-1) meshing with the first sun gear element and a second pinion gear (30-2, 130-2, 330-2) meshing with the first pinion gear (30-1, 130-1, 330-1) and the ring gear structure (24); and a highest numerical translation ratio of approximately 4 to 1 and a lowest numerical translation ratio of approximately 0.7 to 1; where: The composite planetary gear arrangement (20) comprises a first node (32-1), a second node (32-2), a third node (32-3) and a fourth node (32-4), wherein the first, second, third and fourth nodes (32-1, 32-2, 32-3, 32-4) have at least a gear ratio of 3 to 1 between the torque transmission device (56) and the output element (52); the second motor / generator (16) is functionally connected via the transmission train (44) to the compound planetary gear assembly (20) at the first node (32-1); the output element (52) is functionally connected to the composite planetary gear assembly (20) at the second node (32-2); the motor (12) is functionally connected to the composite planetary gear assembly (20) at the third node (32-3); the first motor / generator (14) is functionally connected at the fourth node (32-4) to the composite planetary gear assembly (20); The torque transmission device (56) can be engaged to ground the third node (32-3) to the stationary element (54); and each of the first and second motors / generators (14, 16) uses non-rare earth magnets.

One aspect of the invention relates to a method (100) for regulating the engine torque produced by an internal combustion engine of a powertrain provided with a mechanical gearbox, a mechanical clutch and control means, the method (100) being remarkable in that, during the acceleration phase of the powertrain, it comprises the following steps carried out by the control means: • Detecting (101) a desire to shift from a gear ratio N to a higher gear ratio N+n; • Degrading (102) the nominal spark advances of the internal combustion engine so as to reduce the engine torque produced by the internal combustion engine.

The invention relates to a method for performing a downshift in a motor vehicle transmission of a motor vehicle powertrain, wherein, during the downshift, a change from a neutral state of the motor vehicle transmission to a target gear ratio of the motor vehicle transmission is carried out, for which purpose an unsynchronized shift element of the motor vehicle transmission is closed and speed synchronization is performed at the unsynchronized shift element. During the speed synchronization, a transmission input of the motor vehicle transmission is set to a target speed (n). Ziel ) by establishing a torque transmission between the transmission input and a drive motor of the vehicle powertrain via an intermediate disconnect clutch, and by setting the target rotational speed (n) on the part of the drive motor. ZielThe target speed at the gearbox input is specified. Additionally, a target clutch torque (M) is specified for torque transmission in the disconnect clutch. K,soll ) set, whereby the clutch torque (M) K,soll ) depending on a current temperature (T Getr ) of the vehicle transmission is selected.

The invention relates to a method (100) for operating a pedal-driven vehicle (200), comprising at least one drive (201) for providing a drive torque for propelling the pedal-driven vehicle (200), a gearshift (202) for providing a variable transmission ratio, a control unit (203) and at least one detection unit (204), the method (100) comprising: - Detection (110) of a drive torque provided by the drive (201) and a drive speed of the drive, in particular by a detection unit (204), - Adjusting (130) at least one operating parameter of the gearshift (202) depending on the drive torque and / or the drive speed and / or a drive power provided by the drive (201).

The embodiment of the invention provides a speed reducer used for underground driving and an underground tool assembly. The speed reducer comprises an input shaft, an output shaft and an output shaft, an output shaft; a gear train disposed between the input shaft and the output shaft and providing a first power transmission path having a first gear ratio and a second power transmission path having a second gear ratio greater than the first gear ratio; a pressure sensing part of the pressure driving assembly is exposed in the underground environment outside the speed reducer to sense the environment pressure, and the pressure driving assembly is configured to drive the speed reducer to rotate by means of force generated by the environment pressure when the environment pressure exceeds a preset pressure threshold value. The gear train is automatically switched from operating through the first power transmission path to operating through the second power transmission path.

The utility model discloses a transmission mechanism of an electric control power assisting device, which comprises a lead screw nut, a lead screw and a speed reducing device, the speed reducing device comprises a primary gear and a secondary gear, a connecting shaft is arranged in the electric control power assisting device, the primary gear is sleeved on the connecting shaft, a small gear is fixedly connected on a motor output shaft of the electric control power assisting device, and the small gear is sleeved on the secondary gear. The pinion is meshed with the first-stage gear, the first-stage gear is meshed with the second-stage gear, a first step shaft is arranged on the outer wall of the lead screw nut, the second-stage gear is arranged on the first step shaft in a sleeving mode, the second-stage gear is fixedly connected with the first step shaft through a flat key, a lead screw is in transmission connection in the lead screw nut, and a supporting structure is further arranged on the lead screw nut. The supporting structure is in interference fit with the lead screw nut, the motor output shaft amplifies torque through the speed reducer and then drives the lead screw nut to rotate, rotary motion is converted into linear motion of the lead screw, the lead screw is made to move in the axial direction, the first-stage gear and the second-stage gear achieve step-by-step amplification of the torque, and the transmission ratio and the output force are improved.

The present invention relates to a drive unit (2) for a vehicle (100) comprising a drive (6) and an output (5). The drive unit (2) includes a transmission assembly (7) with a variator (10) for providing multiple driving ranges, a central shaft (36), and an output shaft (42). Furthermore, the drive unit (2) comprises a gearshift transmission (8) with a forward shift element (46) for mechanically connecting the output shaft (42) to the output (5) with a first gear ratio (48) for forward travel. It also includes a shift device (55) for selectively switching between a second gear ratio (53) for forward travel and a gear ratio (49) for reverse travel. The drive unit (2) also includes a reverse shift element (47) for mechanically connecting the output shaft (42) to the shift device (55).The drive device (2) has a double switching element forming the forward switching element (46) and the reverse switching element (47).

This utility model discloses a high-torque dual-rigid-wheel harmonic reducer, relating to the field of reducer technology. It includes a reducer housing, a gear transmission structure, and a harmonic reduction structure. The reducer housing comprises a bottom shell and a side shell, with the side shell mounted on the open side of the bottom shell. The gear transmission structure includes a small bevel gear and a large bevel gear. The small bevel gear is inserted outside the bottom shell and rotatably connected to it, while the large bevel gear is installed inside the bottom shell and the side shell. This high-torque dual-rigid-wheel harmonic reducer, through the arrangement of the small and large bevel gears in the gear transmission structure, enables the reduction structure to meet the transmission connection requirements of two perpendicular structures. Furthermore, the dual-rigid-wheel structure not only improves the overall structural rigidity and enhances the resistance to deformation but also effectively improves the transmission ratio and structural stability. This allows the reducer to be suitable for high-load, high-precision applications while effectively reducing vibration and noise.

The utility model provides a kind of variable pitch's multi-wire cutting device of synchronous regulation, including rack, variable pitch driving mechanism, roller wheel group, cutting line and second driving mechanism and synchronous transmission mechanism, variable pitch driving mechanism includes the first driving mechanism for driving outer roller wheel rotation realizes cutting operation and the variable pitch component for adjusting roller wheel group pitch, the utility model can not disassemble roller wheel group when adjusting pitch, only through motor control can the pitch of roller wheel group be synchronously regulated, in the variable pitch multi-wire cutting machining process, the stable operation of wire cutting machine can be realized, benefit from the small step angle of stepping motor, the high transmission ratio of worm and worm gear and the wide range transmission ratio of planetary gear set in the aspect of adjustment, so that the pitch adjustment of the utility model has the characteristics of high efficiency, high stability, high precision, high flexibility, suitable for the production scene with high efficiency, high precision, wide cutting range machining demand, so that the utility model is easy to popularize and apply.