493 results about "Traction drive" patented technology

The invention relates to the field of intelligent operation and maintenance of rail train traction transmission systems, and discloses an intelligent operation and maintenance method and system for a rail train traction transmission system. The method comprises the following steps: firstly, collecting multi-source heterogeneous knowledge, and defining a fault knowledge graph body and a relationship thereof to construct a knowledge graph; and analyzing and segmenting the text data in different types, and storing the text data into a vector database so as to support subsequent accurate retrieval and reasoning. Establishing a multi-source knowledge retrieval mechanism, and extracting unstructured texts and structured knowledge highly related to fault query by retrieving a vector database and a knowledge graph; aiming at unstructured text knowledge, carrying out sequence optimization on the knowledge by adopting a reordering model; and a cue word template is constructed, texts and structured knowledge are integrated, a large language model is guided to carry out fault analysis, and maintainability decision support is provided. The accuracy and reliability of a large language model in intelligent operation and maintenance in the field can be improved.

The invention relates to a separately excited electric machine (FEM) for a traction drive (TA) of an at least partially electrically powered motor vehicle (KFZ), comprising a rotor shaft (RW) of a rotor (RO) to which a shaft end section (WEA) adjoins, wherein the shaft end section (WEA) has a first opening (EO) and a second opening (ZO) spaced apart from the first opening (EO) in an axial direction of the rotor (RO), a potting body (VK) arranged in the shaft end section (WEA) in which an electrically conductive connecting element (VE) is embedded at least partially, wherein the connecting element (VE) has a distal first end (DEE) and a distal second end (DZE), and the distal second end (DZE) can be guided through the second opening (ZO).a slip ring module (SRM) arranged on a distal end section DE of the shaft end section (WEA) with a slip ring (SR) and a connecting section (VA) arranged on the slip ring (SR), which is electrically conductively connected to the distal first end (DEE) of the connecting element (VE), and a bearing device (LE) which sits on an outer lateral surface (AM) of the shaft end section (WEA).

The invention discloses an electric locomotive three-dimensional digital-analog simulation teaching system constructed based on an unreal engine technology, and relates to the technical field of electric locomotive teaching. Comprising a three-dimensional model construction module which is used for generating a hierarchical three-dimensional model of electric locomotive equipment through combination of polygon modeling and parametric modeling; and the physical engine interaction module is integrated with an unreal engine physical system and is configured to process the real-time solution of the locomotive kinetic parameter equation set. According to the method, a highly accurate three-dimensional model is created by combining polygon modeling and parametric modeling on the complex equipment of the electric locomotive, the model can support detailed level-of-detail rendering so as to adapt to different observation distances, and in the physical engine interaction module, the model can be applied to the physical engine interaction module. Through the train longitudinal dynamics calculation unit, the traction transmission simulation unit and the braking system modeling unit, the system can simulate non-linear changes in the wheel-rail contact force, traction motor torque transmission and tread braking process in real time, so that various dynamic effects can be visually displayed in the teaching process.

The utility model discloses an assembly type pipe gallery assembling rack, and belongs to the technical field of pipe gallery construction, the assembly type pipe gallery assembling rack comprises a ground rail, a movable base, a supporting mechanism, an assembly supporting plate, an auxiliary positioning piece and a traction driving mechanism, the movable base comprises a bottom plate, boundary beams are fixedly arranged on the two sides of the lower end face of the bottom plate, and rolling wheels are rotatably arranged on the boundary beams; the auxiliary positioning piece comprises a guiding piece fixedly arranged on the assembly supporting plate and an inserting piece arranged in the assembly type pipe gallery top plate. Under the common guiding effect of the arranged guiding piece and an inserting piece in the assembly type pipe gallery top plate, the pipe gallery top plate can be placed at the designated position on the assembly supporting plate, then the traction driving mechanism drags the movable base to the designated position along the ground rail, and then the supporting mechanism works to lower the assembly supporting plate; the pipe gallery top plate placed on the pipe gallery top plate assembling device can be assembled to a designated position, and manual auxiliary positioning work and temporary support building work can be omitted.

An autonomous transport robot for transporting a payload, autonomous transport robot including, frame with integral payload support that has a payload seat surface defining a payload datum position that determines predetermined payload position relative to autonomous transport robot, transfer arm connected to the frame and configured for autonomous transfer of payload to and from the frame, one caster wheel mounted to frame, drive section with a pair of traction drive wheels astride the drive section, drive section being connected to the frame, wherein the one caster wheel and one traction drive wheel of the pair of traction drive wheels roll, on a rolling surface effecting autonomous transport robot traversal over the rolling surface, each having a fully independent suspension, and are disposed on the frame astride the integral payload support so that the payload seat surface at the payload datum position is disposed at minimum distance above the rolling surface.

The invention relates to the technical field of cable hoisting, in particular to a cable hoisting circulating traction system and cable hoisting equipment, a first anchor, a second anchor, a first cable bent tower and a second cable bent tower are arranged on a first shore and a second shore respectively, a crown block device is slidably arranged on a bearing cable, one end of the bearing cable is anchored with the first anchor, and the other end of the bearing cable is anchored with the second anchor. The other end is anchored with the second anchor through the first cable bent tower and the second cable bent tower in sequence; the traction device comprises a traction driving mechanism and a traction cable, the first end of the traction cable is connected with the first anchor through the first anchor, the first cable bent tower and the first end of the crown block device, and the second end of the traction cable is connected with the second anchor through the first anchor, the first cable bent tower, the second cable bent tower, the second anchor and the second end of the crown block device; the traction driving mechanism can drive the crown block device to slide along the bearing cable through the traction cable. The single traction rope circulates to pull the crown block device to move back and forth, and the safety risk of forced opposite pulling caused by unsmooth command signals when traction is conducted on the two banks at the same time is overcome.

A method and device for dynamically adjusting train interval based on wide-area interlocking control, and a computer-readable storage medium. The method includes: (1) dynamically managing trains; (2) identifying a following relationship; if there is a following relationship, performing step (3), otherwise, controlling the train using existing control technology; (3) identifying weather; if the thunderstorm weather occurs, performing step (4); otherwise, adjusting the train interval by existing control technology; (4) acquiring operation states of a wireless communication system, traction power grid, traction drive system and train control system in real time; if the operation conditions are normal, performing step (5), otherwise, performing step (6); (5) independently analyzing the safety of actual following distance by the preceding and following trains in real time; performing interlocking control according to analysis results; and (6) activating a fail-safe interlocking control module to ensure dynamic and safe control of the train interval.

The invention relates to an electric transmission drive unit (10), and a method for manufacturing such a unit, in particular for a traction drive of a motor vehicle, with an electric motor (12) which has a rotor shaft (14) which drives a subsequent gear transmission (20) with an output element (22) for reduction, wherein the gear transmission (20) is arranged in a transmission housing (21) and has several gear wheels (24), wherein liquid cooling lubricant (30) in the transmission housing (21) can be conveyed by means of at least one gear wheel (25) from a cooling lubricant sump (32) via a lifting area (36) into a higher cooling lubricant reservoir (34).

An electric traction system having an electric machine, a transmission and a common cooling lubricant circuit, wherein an oil sump and at least one oil reservoir are installed. The oil reservoir can be filled both by means of an electric oil pump (1) and by means of oil spray from components of the transmission, wherein the oil reservoir acts as a pressure tank or high tank. The oil pump is connected directly to cooling / lubricating oil points under pressure, and the at least one outlet of the oil reservoir is connected to further cooling / lubricating oil points, wherein the further cooling / lubricating oil points are pressurized either also with the pressure of the oil pump or with the geodetic pressure of the oil reservoir.

The invention relates to the technical field of bag making machine control, in particular to a round corner positioning and cutting device and method for a composite film, and the round corner positioning and cutting device comprises a rack main body, a traction driver and a control center; a cutter assembly and a traction assembly are arranged on the rack main body; a camera is arranged on the feeding side of the cutter assembly. When the control center receives a traction instruction, a traction pulse is sent to the traction driver in real time so as to control the traction driver to drive the traction assembly to perform traction; during the period that the control center sends the traction pulses to the traction driver, when the control center receives an ending instruction, an error adjusting instruction is generated according to the first number of the traction pulses sent in the traction process and an original image collected by the camera in the traction process so as to control the cutter assembly to conduct position adjustment and composite film cutting. The method has the beneficial effects that the time consumed in the error calculation process is shortened, the running speed of the whole machine is improved, the production efficiency is further improved, and the material waste is reduced.

The invention relates to a method for assembling an electric traction drive (10) for a motor vehicle, which in the final assembly state has a housing (20) with an electric machine (30) arranged inside it, wherein the electric machine (30) - a housing-mounted stator (321) and - a rotor (341) arranged radially inside the stator (321), which is fixed on a rotor shaft (342) which is supported at least two positions on both sides of the stator (321) on the housing (20). The invention is characterized by a special division of the components into two assemblies (61, 62) which are axially joined together with the aid of one or two centering mandrels (81, 82) in order to enable a smaller dimensioning of the air gap between rotor (341) and stator (321) of the electric machine (30).

The invention discloses a soil bin test bed capable of switching test wheel driving modes, which mainly comprises a soil bin box body, a longitudinal moving module, a loading module, a single-wheel detection module and a data acquisition and control module, the single-wheel detection module is driven and limited by the longitudinal moving module, the horizontal moving speed and the wheel speed can be set by the data control module, and the loading module is used for loading the single-wheel detection module. The loading module controls the longitudinal force and the vertical force borne by the single-wheel detection module, and the single-wheel detection module collects the rotation soil interaction parameters and uploads the rotation soil interaction parameters to the upper computer through the data collection module. The device is designed for solving the problem that an existing soil bin test bed cannot rapidly switch the driving mode of the test wheel, has three working modes, can simulate three working conditions of driven traction of the driven wheel, free rolling of the driving wheel and traction rolling of the driving wheel, facilitates research on the interaction mechanism of wheels with different driving modes and the ground, and improves the test efficiency. The test device has the advantages of controllable test conditions and environmental factors, comprehensive working condition simulation and the like.

The utility model belongs to the technical field of reinforcing steel bar machining, and discloses reinforcing steel bar machining equipment which comprises a reinforcing steel bar arc bending device, the reinforcing steel bar arc bending device comprises an arc bending rack, two traction wheels, a traction driver, an arc bending driver, a movable support, an arc bending pressing wheel and a limiting mechanism, the two traction wheels are arranged on the arc bending machine frame in the first direction in a spaced mode, the traction driver is arranged on the arc bending machine frame and can drive at least one traction wheel to rotate around the axis of the traction wheel, the arc bending driver is installed on the arc bending machine frame, the movable support is installed at the output end of the arc bending driver, and the arc bending pressing wheel is rotationally installed on the movable support. The limiting mechanism is installed on the movable support. According to the steel bar bending machine, when the steel bars are clamped between the traction wheel and the arc bending pressing wheel, the steel bars are located between the arc bending machine frame and the limiting mechanism, the limiting mechanism can block the steel bars, and the steel bars are prevented from protruding and tilting outwards from the traction wheel and the arc bending pressing wheel.

The invention relates to wire and cable tensile strength automatic detection equipment, and relates to the technical field of material performance detection. A machine table serves as a basic supporting structure, a driving assembly is arranged on the machine table to provide linear driving power, and a displacement detection assembly monitors a tension value in real time; the clamping device clamps the wire cable through cooperation of a swing arm, a supporting ring, a pressing ring and other parts, the bonding assembly can extrude glue for further fixing during clamping, and the air injection assembly accelerates drying and fixing of the glue. The driving assembly is composed of a traction driving motor, a driving gear, a screw rod and the like. The displacement detection assembly is composed of a tension sensor and a tension spring. The device achieves the technical effects of accurately and reliably detecting the tensile strength of the electric wire and cable, and improving the detection stability and accuracy through glue adhesion and air injection accelerated drying.

The invention relates to the technical field of stranding, in particular to a modular stranding pitch changing stranding machine which comprises a ship frame type rotating mechanism, the ship frame type rotating mechanism is connected with a main driving motor, a take-up frame is rotatably connected in the ship frame type rotating mechanism, and the take-up frame is provided with a traction wheel set and a traction driving assembly. The traction wheel set is used for pulling a stranded wire to take up, the traction wheel set is connected with the traction driving assembly and used for providing traction force for the traction wheel set, the traction wheel set comprises an upper traction wheel and a lower traction wheel which are used for winding the stranded wire, the traction driving assembly is a gear set, the gear set comprises an upper gear and a lower gear which are meshed with each other, and the upper gear is coaxially connected with the upper traction wheel; the stranding machine disclosed by the invention has multiple stranding pitch adjusting modes, and can meet the requirements of users on stranding pitch changing modes of the stranding machine by switching different pitch changing assemblies.

A drive train for a vehicle with a pedal drive with a bottom bracket shaft (1) of a crank drive, which comprises a first planetary gear (8, 9, 10) shiftable by clutches, the output of which is connected by a traction means to a rear wheel gearbox comprising a further gearbox shiftable by second clutches, wherein these two gearboxes are each to be shifted in such a correlated manner that gear transitions are approximately the same overall, characterized in that, in a first shift position, the bottom bracket shaft (1) is directly connected on an output side to a traction drive (ZG) by the first planetary gear (8, 9, 10) and / or, in addition, an auxiliary electric motor (EM) is connected by the planetary gear (8, 9, 10) to the traction drive (ZG) and that the gear transition of the first planetary gear (8, 9, 10) comprises each all finer-stepped gear transitions of a further gearbox (NG) arranged downstream via the traction drive (ZG) and / or in a second shift position of the planet carrier clutches and the sun gear wheel clutches (KPT, KSR) of the first gearbox, the auxiliary electric motor (EM) is coupled directly to the output shaft (3) via the reduction gearbox and further the bottom bracket shaft (1) is coupled to the output shaft (3) via this first planetary gear (8, 9, 10).

An elevator tractive drive system including a plurality of wheels coupled to an elevator cab. The plurality of wheels are configured to compress into one or more shaft-mounted rails and / or one or more interior shaft wall surfaces. The plurality of wheels are powered by one or more motors coupled to a transmission configured to deliver regulated torque to the plurality of wheels. The system includes various sensors to measure parameters related to kinematics of the cab and / or the plurality of wheels, parameters related to a mass or a weight of the elevator cab and any payload and / or parameters related to compressive forces generated at a wheel-rail or wheel-shaft interface. A controller is configured to receive input from each of the sensors and activate the at least one actuator and / or motors, to generate or adjust regulated compressive force and associated tractive force delivered at the wheel-rail interface and / or the wheel-shaft interface.

The invention relates to the field of turning equipment, and discloses oil press pressing screw outer spiral machining equipment which comprises a rack base, an embedded stabilizing mechanism is located on an operation sliding table, and the embedded stabilizing mechanism is matched with an external rotary drum and a distribution guide rail of a guide roller shaft to be used for conducting circumferential clamping along the interior of a pressing screw blank. The linear traction mechanism is located on the center guide groove table, and the synchronous switching mechanism is located on the rack base and used for fixing thread groove cutting tools and synchronously switching the tools in cooperation with the side sliding table, the regulation and control screw rod, the linear opposite grooves of the center guide groove table and the U-shaped guide grooves of the linkage guide groove table. Synchronous clamping, fixing and rotating of two sets of pressing screw blanks are achieved through a concentric clamping mechanism and an opposite output mechanism which are symmetrically designed, double-station external spiral cutting is completed at a time in cooperation with a synchronous switching mechanism driven by linear traction, a mechanical structure that a center gear is in linkage with upper and lower opposite racks is adopted, strict synchronous movement of the clamping mechanisms on the two sides is ensured, and the working efficiency is improved. Machining errors caused by single-side stress are avoided, and meanwhile the power input requirement is simplified.

The invention relates to the technical field of cleaning agent granulation, and discloses a cooling granulation system for a special cleaning material of a screw extruder, which comprises a base, a cooling assembly for cooling the special cleaning material extruded by the screw extruder, a guide assembly for guiding the cooled special cleaning material and a granulation mechanism for shearing the special cleaning material after guiding treatment are arranged at the top of the base. According to the cooling and granulating system for the special cleaning material of the screw extruder, through the arrangement of the traction assembly, the cooled special cleaning material can be subjected to orderly pulling and traction work, and the situation that the special cleaning material is broken due to the fact that traction force is too large can be effectively prevented; and the shearing assembly is in transmission connection with the traction assembly through two third belt sets, so that the shearing assembly is conveniently driven by traction driving force of the traction assembly to shear and granulate the special cleaning material, and the energy-saving and environment-friendly properties of the granulation equipment and the orderliness of traction granulation are improved.

The utility model provides a mining anti-explosion large-dip-angle track inspection robot which comprises a robot body, a track inspection robot main body, a track inspection robot main body, a track inspection robot main body, a track inspection robot main body, a track inspection robot main body and a track inspection robot main body, the traction driving module is mounted on the robot body, and the traction driving module is used for driving the robot body to move along the track; the information acquisition unit is installed on the robot body, the information acquisition unit is used for acquiring inspection information, and the inspection information at least comprises operation state information and environment condition information of the belt conveyor; and the control module is electrically connected with the information acquisition unit and the traction driving module, the control module generates a control instruction based on the inspection information, the traction driving module controls starting and stopping of the robot body based on the control instruction, and the problem that in the prior art, manual inspection affects safety is solved.

The utility model discloses an additional counterweight type traction driving elevator which comprises an elevator car, an elevator host traction wheel, a fixed guide wheel and / or a movable pulley type guide wheel, a fixed redirection guide wheel, a main counterweight device, an additional counterweight device, a main steel wire rope and an additional steel wire rope. The additional counterweight device and the main counterweight device which are independent from each other are arranged, so that the function of balancing the weight of all or part of the dead weight of the elevator car for energy conservation is realized, the design position is not limited, the space of the shaft can be fully utilized according to the specific condition of the shaft when the elevator is designed, and the design cost is reduced. And the problem that a counterweight device is too large can be solved. The counterweight device is also suitable for the transformation project of increasing the rated load capacity of the freight elevator, and the transformation cost of the original counterweight device can be greatly reduced.

The utility model discloses an angle module for traction and steering of a wheeled robot, which relates to the technical field of robot running parts, and comprises a vehicle body bracket and tires at four corner ends, a mounting shell is arranged above the tires, an angle module is arranged on the side of the tires, and the angle module comprises a traction module and a steering module. A traction motor in the traction module is connected with a traction rotating shaft through a speed reducer, a driving shaft and other parts to drive tires to rotate, and the axis of the traction driving shaft is coplanar with tire landing points; the steering module achieves steering through a steering motor and other components. The vehicle body support comprises a central framework, a bridge frame and modular bridges, one modular bridge is connected with the weeding module, and the other modular bridge is provided with a self-adaptive suspension and a suspension optical axis. The angle module solves the problems of power transmission, steering performance, structural stability and the like of an existing angle module, and has the advantages of being efficient, flexible, stable, universal, good in environmental adaptability and the like.

A robotics corner module includes a steering drive unit, a traction drive unit, and an intermediate assembly. The steering drive unit includes an output shaft configured to be rotationally driven about an output shaft axis. The traction drive unit includes a wheel configured to be rotationally driven about a wheel hub axis. The intermediate assembly extends between the steering drive unit and the traction drive unit and includes a support structure and a cooling system. The support structure is operably coupled to the output shaft and the traction drive unit, such that rotation of the output shaft about the output shaft axis drives rotation of the intermediate assembly and the traction drive unit about the output shaft axis. The cooling system includes a radiator mounted to the support structure and a fan mounted to the support structure and configured to deliver air to the radiator.

The invention discloses a switch cabinet external electric operation device with a calibration function and a method thereof, and belongs to the technical field of electric operation devices.The switch cabinet external electric operation device comprises a scissor lift and a loading guide assembly, the loading guide assembly comprises a loading assembly and a guide assembly, the loading assembly is installed on the top of a lifting platform of the scissor lift, and the guide assembly is installed on the top of the lifting platform of the scissor lift. The guiding assembly is arranged on the loading assembly and connected with the rear side of a base of the scissor lift. A lifting platform of the scissor lift is provided with a positioning calibration driving assembly used for positioning a positioning structure on the switch cabinet, the top of the lifting platform of the scissor lift is provided with a traction driving assembly, and the traction driving assembly is connected with the loading assembly. By means of the mode, accurate adjustment of the height of the switch cabinet matched with the scissor-type elevator is achieved, and meanwhile the circuit breaker handcart is automatically pushed into the switch cabinet installation cavity.

The invention relates to a wheel drive rail type gravity flow energy storage system and an energy storage method. The wheel drive rail type gravity flow energy storage system comprises a double-circulation bearing mechanism, a double-circulation traction mechanism and a double-wheel drive mechanism. The double-circulation bearing mechanism comprises two bearing rails, the double-circulation traction mechanism comprises two traction ropes, the double-wheel driving mechanism comprises two driving wheels which are arranged in parallel and vertically mounted, and the traction ropes are wound on the driving wheels and continuously run under the driving of the driving wheels; a plurality of carrying mechanisms are arranged between the bearing rails, the pulling rope pulls and drives the carrying mechanisms to operate continuously, and the carrying mechanisms are used for carrying energy storage blocks serving as energy storage carriers; the driving wheel is connected with an electric power generation mechanism; the electric power generation mechanism is used for driving the driving wheel to rotate actively, and continuous gravity flow is formed through the continuously-lifted energy storage block. And the energy storage block which continuously descends drives the driving wheel to rotate, so that the gravitational potential energy is converted into electric energy of the electric power generation mechanism, and continuous energy flow is formed.

The invention relates to a mobile unit and a system having a high-bay warehouse and a mobile unit, comprising - a running gear, - a geared motor as the traction drive, and - a wheel, which can be driven by the traction drive and is rotatably mounted on the running gear, in particular by a rolling bearing, the mobile unit having an eddy-current brake.

The utility model relates to the technical field of coating, in particular to coating equipment. The coating equipment provided by the utility model comprises an unwinding mechanism, a traction mechanism and a winding mechanism, the unwinding mechanism is used for releasing a base material, the traction mechanism is positioned at the downstream of the unwinding mechanism, the traction mechanism comprises a traction roller and a traction driving piece, the traction roller is a rubber roller, and the base material passes through and is wound on the traction roller; the output end of the traction driving part is in transmission connection with the traction roller, the traction driving part is used for driving the traction roller to rotate, the winding mechanism is arranged on the downstream of the traction mechanism and comprises a winding roller, a smoothing roller and a winding driving part, the output end of the winding driving part is in transmission connection with the winding roller, and the winding driving part is configured to drive the winding roller to rotate; and the base material is wound around the smoothing roller and is wound on the winding roller. The coating equipment can transport a base material at a constant speed, and the production quality is improved.

A medical system includes a manipulator assembly that includes a traction drive for driving a flexible elongate device of a medical instrument along an insertion axis of the manipulator assembly. The traction drive is configured to form a detection zone that imprints a mechanical signature on the flexible elongate device. The manipulator assembly further includes a shape sensor configured to measure a shape of the flexible elongate device and a control system coupled to the manipulator assembly. The control system is configured to identify, using the shape sensor, the mechanical signature at a location of the flexible elongate device, and determine, based on the location, a spatial relationship between the flexible elongate device and the traction drive.

The invention relates to the technical field of pipe penetrating traction, in particular to a simple pipe jacking and penetrating traction device which comprises a main frame body, and a fixing base frame and a traction driving support are arranged on a frame plate face of the main frame body. A hollow guide cylinder is arranged on the fixed base frame and is provided with an inner channel, one end of the guide cylinder is provided with a pipe jacking inlet, the other end of the guide cylinder is provided with a rear part, the rear part is provided with a traction guide bushing, one end of the traction guide bushing extends into the inner channel and is provided with a traction access port, and the other end of the traction guide bushing is connected with a rod body guide cylinder. The traction rod is arranged in the rod body guide cylinder in a penetrating mode, and the traction end of the traction rod stretches into the inner channel through the traction access port and is detachably connected with the top pipe in the inner channel. A middle-position supporting frame is arranged on the traction driving support, a traction base is installed on the middle-position supporting frame, and the pulling end of the traction rod is connected with the traction base. Meanwhile, the traction driving mechanism is arranged on the side edge of the traction driving support, the jacking pipe can be driven to directionally move in the inner channel of the guide cylinder through linkage of the traction base and the traction rod, and accurate traction pipe penetrating of the jacking pipe is achieved.

Pressure piece (1) for fastening to a tensioning rail (2) of a traction drive, with a fastening section (8) which is prepared for entering into a connection with the tensioning rail (2) and a contact section (7) which is prepared for coming into contact with a tensioner, characterized in that a plurality of passages (9) for fluid conduction which completely penetrate said contact section are provided in the contact section (7), wherein the passages (9) are arranged one behind the other in the longitudinal direction of the pressure piece (1), wherein 4, 5, 6 or more passages (9) are arranged and / or that the passages (9) extend in the longitudinal direction over the entire length of the pressure piece (1).