30 results about "Torsional angle" patented technology

The invention relates to an axle motion instantaneous center analysis method and device, computer equipment and a medium. The axle motion instantaneous center analysis method comprises the steps that the incidence relation between the moving horizontal distance of a first center of a single plate spring in a spring assembly after longitudinal torsional deformation and the relative distance of a spring eye and the incidence relation between the effective half length and the longitudinal torsional angle of the single plate spring are obtained; differentiating the longitudinal torsion angle to obtain a proportional relation between the first vertical position and the relative distance of the spring eye; the first vertical position is the position of the first instantaneous center of the single leaf spring in the vertical direction of the first coordinate system; when the number of the plate springs is multiple, a second vertical position is obtained based on the correction coefficient of the correction proportional relation, the number of the plate springs, the effective half length of the non-main-leaf plate springs and the effective half length of the main-leaf plate springs; the second vertical position is the position of the second instantaneous center of the plurality of plate springs in the vertical direction of the second coordinate system; and based on the second vertical position and the horizontal position of the second instantaneous center, the movement instantaneous center position of the axle located at the second center of the multiple leaf springs is determined. According to the method, the accurate position of the axle movement instantaneous center can be obtained.

A stress-strain relationship estimation method according to the present invention comprises: a step (S1) for performing a torsion test on a first round bar test piece (10) to obtain a relationship between a torsion torque and a torsion angle; a step (S3) in which a torsion test is performed on a second round bar test piece (10) having a parallel section (11) having a smaller radius than the first round bar test piece (10), and the relationship between the torsion torque and the torsion angle is obtained; a step (S5) in which the relationship between the shear stress and the surface shear strain is obtained on the basis of the relationship between the torsion torque and the torsion angle obtained by the respective torsion tests of the first round bar test piece (10) and the second round bar test piece (10); and a step (S7) in which the shear stress and the surface shear strain are converted into uniaxial tensile stress and strain, and the relationship between the stress and the strain is estimated.

The present invention discloses a band saw blade and a method for processing the torsion angle thereof. The method comprises defining a three-dimensional coordinate system and a straight line L; controlling a processing tool to move to an initial position, wherein the initial position refers to a position in which the working surface of the processing tool coincides with the straight line L and the lowest point of the working surface is located at point A, which is located on the straight line L and above the origin O; controlling the band saw blade to move along the X-axis so that the tip of the tooth to be ground of the band saw blade is located at the origin O; determining the type of tooth to be ground; and controlling the rotation and movement of a grinding wheel based on the type of tooth to be ground to achieve torsion angle processing. The present invention achieves torsion angle processing control by controlling the deflection angle of the grinding wheel, greatly improving the processing accuracy of the torsion angle, thereby improving the performance and stability of the band saw blade.

The utility model provides a device for testing the torsion angle of a composite hose. The device comprises a dial assembly and a pointer assembly, a base of the dial assembly and a pointer in the pointer assembly can synchronously rotate with one end of the composite hose, and the dial does not rotate under the action of the rotation limiting piece and keeps an initial state; in the process that the pressure of the composite hose reaches a specified value, along with the synchronous rotation of the pointer and the non-rotation of the dial, the torsion degree of one end of the composite hose can be visually observed, and secondary calculation by testers is not needed.

The present application belongs to the field of medical devices, and specifically relates to a fusion device system, comprising: a fusion device mechanism having a first end and a second end, the fusion device mechanism being curved and annular, the fusion device mechanism comprising an upper contact member and a lower contact member arranged opposite to each other, and a first connector elastically connecting the upper contact member and the lower contact member; an implant mechanism comprising a main body and a second connector, the second connector passing through the main body and connected to the fusion device mechanism; an adjustment structure comprising a connected driver and a third connector, the third connector being connected to the implant mechanism, and adjusting the relative position of the first and second ends of the fusion device mechanism by changing the driver to adjust the torsion angle of the fusion device mechanism until it fits with the surfaces of the upper and lower vertebral endplates. The above-mentioned configuration is used to adapt the fusion device system to the implantation environment.

This invention discloses a torsion angle measuring device for torsion testing, comprising a specimen and an encoder. The encoder's rotating shaft is coaxially connected to the specimen via a connecting frame, enabling the rotating shaft to rotate coaxially with the specimen. The encoder is configured to acquire the torsion angle signal of the specimen through the rotation of the rotating shaft. This invention, by directly connecting the encoder's rotating shaft coaxially with the specimen, effectively eliminates errors in traditional indirect measurements, facilitating in-situ high-precision measurement of the torsion angle. This direct connection significantly improves the measurement sensitivity for small torsional deformations, accurately capturing minute angular changes in the specimen as it approaches its fatigue limit. Simultaneously, it simplifies the measurement process, avoids signal attenuation and interference during transmission, and ensures that the obtained torsion angle data more accurately reflects the initiation and development of cracks within the specimen.

The invention discloses a torsion self-resetting damper and a mounting method thereof, the torsion self-resetting damper comprises a shell, the shell is provided with an external connecting plate, the external connecting plate is sequentially provided with a connecting part, a torsion energy dissipation part and a self-resetting part along the length direction, the connecting part is connected with a building structural member, and the self-resetting part is connected with the torsion energy dissipation part. Racks are arranged on the upper face or / and the lower face of the torsion energy dissipation part, and reset curved faces are arranged on the upper face or / and the lower face of the self-reset part. A torsion energy consumption device matched with the torsion energy consumption part and a self-resetting device matched with the resetting curved surface are mounted in the shell; according to the torsion damper, the torsion angle of the bar is amplified through the gear, the torsion energy dissipation device and the self-resetting device are arranged, so that the energy dissipation capacity of the torsion bar can be fully exerted under small displacement of the torsion damper, and meanwhile residual deformation of the structure is reduced through the self-resetting device.

The utility model belongs to the field of aircraft structure design, and particularly relates to a double-shear torsion bar type sealing plate which comprises a hanging belt plate, a sealing skin, a torsion bar, a torsion support and a fixed support. The hanging belt plate and the sealing skin are arranged on the two sides of the torsion bar respectively. Square torsion heads are arranged at the two ends and the middle of the torsion bar, square torsion holes are formed in one end of the hanging belt plate, the torsion support and the fixed support, and the square torsion holes are connected with the corresponding square torsion heads on the torsion bar. After assembly is completed, the rear edge of the sealing skin is pushed by the control surface structure so that the sealing skin can rotate around the axis of the torsion bar, and the torsion bar is in a torsional deformation state and provides restoring force for the sealing skin. That is, large displacement formed by swinging of the rear edge of the sealing skin is achieved through torsional deformation of the torsion bar, so that stress and strain on the sealing plate are greatly reduced. The size of the torsion driving force can be adjusted by adjusting the size of the preset torsion angle. The torsion bar is small in occupied space and simple and reliable in torsion mechanism.

The invention discloses a transmission system performance test method, a computer readable storage medium and a test device. Comprising the following steps: controlling a driving piece to perform linear loading at a first loading torque and a first loading slope; a torsion angle < {in1} of the input shaft, a torsion angle < {out1} of the first output shaft and a torsion angle < {out2} of the second output shaft are obtained, and a relative gap value at the moment is calculated; controlling the driving piece to perform linear loading at a second loading torque and a second loading slope; a torsion angle < {in2} of the input shaft, a torsion angle < {out3} of the first output shaft and a torsion angle < {out4} of the second output shaft are obtained, and a relative gap value at the moment is calculated; and calculating the transmission clearance of the to-be-measured transmission system. Therefore, according to the performance test method provided by the invention, the rotation torque and the torsion angle are accurately measured, and the transmission gap of the to-be-tested transmission system is calculated through the two relative gap values, so that the measurement accuracy can be improved, the manual dependence is low, the automation degree is high, and the operation efficiency is high.

An annuloplasty device configured to mechanically strain annulus tissue while delivering structural disruption energy to induce plastic deformation. In some embodiments, the mechanical distortion includes vacuum-induced attachment to the tissue, optionally with or without additional manipulation to tension or stretch the tissue. In some embodiments, the mechanical distortion includes torsional deformation of the tissue. Optionally, the torsional deformation is limited by the device to a predetermined torsional angle, e.g., in the range of 60° to 120°. In some embodiments, the torsional deformation includes rotating an axis extending between tissue-implanting pins of the device from a first angle oblique to a local circumferential direction, through an intermediate angle perpendicular to the local circumferential direction, to a second such angle. In some embodiments, a non-penetrating transducer delivers structural disruption energy via a surface that contacts the annulus tissue.

The invention discloses a blade optimization method and device, a storage medium, an electronic device and a computer program product, and relates to the field of blades, and the blade optimization method comprises the following steps: determining a corresponding rated wind speed of a target blade under the condition of considering flexible deformation, the rated wind speed is the wind speed corresponding to the condition that the wind driven generator reaches the rated generation power; determining an aeroelastic torsional deformation angle of the blade section of the blade corresponding to the rated wind speed to obtain a target aeroelastic torsional deformation angle; and optimizing the pneumatic torsional angle of the blade section according to the target aeroelastic torsional deformation angle. By the adoption of the technical scheme, the problem that power is reduced due to flexible deformation of the blades is solved.

The utility model provides an anti-loose locking nut, which belongs to the technical field of fasteners, and aims to solve the problems that the conventional axial anti-loose locking nut needs to perform fine knob adjustment on a plurality of extrusion parts repeatedly in the fastening process, the operation is complicated and time-consuming, and the final torsion angle is easy to deviate. The three extrusion pieces are connected to the interior of the coating shell in a dispersed and threaded mode; the operation cover is arranged in front of the coating shell; the twisting shaft is rotationally connected to the interior of the operation cover; the operation assembly is arranged in the operation cover; and the locking assembly is arranged in the nut main body. The three keying pieces can be driven to rotate at completely consistent angles by rotating the twisting shaft, so that the amplitude of pressure applied to the three wedge blocks is consistent, the amplitude balance of the three wedge blocks in the moving process is realized, and the locking capability and the stability of a bolt or a screw rod are ensured.

The application relates to a torsion angle description and analysis method of a profile bending and twisting component, and relates to the advanced manufacturing field of complex profile bending components. NURBS parameters on the edges and the center line of the profile bending and twisting component are extracted respectively, parameterized dot distribution is carried out according to the arc length, the curvatures and coordinates of each point on the curve are obtained, a torsion vector and a projection plane are constructed, matrix transformation is combined, and finally the section torsion angles at different positions on the center line are calculated. In this case, the application provides an analysis method of the torsion angle parameters by adopting six-axis free bending and twisting technology to manufacture the profile bending and twisting component, the torsion angle change of each section of the profile bending and twisting component along the axis can be accurately described, and the manufacturing precision of the six-axis free bending and twisting technology is further improved. In addition, the method is simple and feasible, has high analysis efficiency, has important engineering application value in the fields of aviation and new energy vehicles, and has obvious economic benefits.

One aspect of this disclosure relates to a cutting tool comprising a shaft portion and two or more main cutting edges. The shaft portion extends along a central axis. The shaft portion has an outer peripheral surface. The outer peripheral surface surrounds the central axis. The two or more main cutting edges are arranged in a helical configuration on the outer peripheral surface. Each main cutting edge has a main cutting edge. The main cutting edge has a torsion angle. In the direction along the central axis, within ±30% of the cutting edge length of the region from the center of the region, the main cutting edge has at least one first slit portion and a second slit portion. The main cutting edge is formed in the region. The first slit portion and the second slit portion have torsion angles in opposite directions to the torsion angle. The relationship between the first slit portion and the second slit portion satisfies at least one of a first condition and a second condition. The first condition is that the width of the first slit portion is different from the width of the second slit portion. The second condition is that the depth of the first slit portion is different from the depth of the second slit portion.

The present invention relates to the technical field of deformation monitoring, and particularly to a measurement method and system for the deformation of the initial support steel arch of a tunnel, including: obtaining the strain data of each strain rod relative to the waist measurement point at each deformation monitoring point during the period to be measured; analyzing the movement of each strain rod according to the strain data corresponding to each deformation monitoring point during the period to be measured, and analyzing the deformation of different strain rods at the same deformation monitoring point in combination with the physical parameter information of the strain rods to obtain the deformation detection index of each strain rod at each deformation monitoring point during the period to be measured; obtaining the torsion angle detection index of each deformation monitoring point during the period to be measured according to the deformation detection index and the distance distribution between each deformation monitoring point and the waist measurement point; and judging the deformation early warning situation of the tunnel steel arch during the period to be measured by using the deformation detection index and the torsion angle detection index. The present invention makes the deformation monitoring result of the steel arch more comprehensive and improves the monitoring safety.

The invention relates to a numerical control three-dimensional spine correcting instrument and a key parameter setting method thereof.The numerical control three-dimensional spine correcting instrument comprises a rack, a head and chest plate, a hip and leg plate and a hip plate, the head and chest plate is arranged on a sliding rail base in a sliding mode along the y axis, the hip and leg plate can rotate around the x axis and the y axis respectively, and the hip plate is rotationally arranged on the hip and leg plate; the sliding rail seat is rotationally arranged on the rack, and the sliding rail seat rotates to enable one side, close to the hip-leg plate, of the head-chest plate to quickly jack up and down in the z-axis direction; the impact stroke of the head and chest plate is 30-100 mm and adjustable, the up-down fast jacking stroke of the head and chest plate is + 50--50 mm and adjustable, the angle formed by rotating the hip and leg plate around the x axis is + 15--25 degrees and adjustable, the angle formed by rotating the hip and leg plate around the y axis is 0-30 degrees and adjustable, and the torsion angle of the hip plate is 0-15 degrees and adjustable. The impact and fast jacking actions of the head-chest plate, the rotation action of the hip-leg plate around the y axis and the twisting action of the hip plate are required to be synchronously completed within 0.25 second. Various key actions of the traditional Chinese medicine spine correction technique are more accurately achieved, the accurately quantified three-dimensional actions act on the lesion intervertebral space at the same time, and the correction effect can be remarkably improved.

A clamp for measuring the torsion angle of a deformed steel bar longitudinal rib comprises an inspection rack and a cylinder support, the cylinder support is installed on the inspection rack, a cylinder is installed above one side of the cylinder support, a compression spring is arranged at the front end of a cylinder piston head, a connecting steel plate is welded to the tail end of the compression spring, one side of the connecting steel plate is connected with an upper clamping plate, and the other side of the connecting steel plate is connected with a lower clamping plate. The upper clamping plate is provided with an upper groove, the inspection rack is provided with a lower clamping plate, and the lower clamping plate is provided with a lower groove. The clamp has the advantages that the clamp is installed at the head end of an inspection rack, the head end of the deformed steel bar is fixed in the horizontal direction of a longitudinal rib, and a measurer can independently measure the torsion angle at the tail end of the deformed steel bar, so that single-person operation is achieved, more convenience is achieved, deviation caused by manual fixing of the head end of the deformed steel bar can be eliminated at the same time, and the measuring efficiency is improved. And economy and reliability are realized. The clamp can be suitable for clamping deformed steel bars of different specifications by replacing the upper clamping plate and the lower clamping plate, and detection efficiency and accuracy can be effectively improved.

The utility model relates to a large-torsion-angle comfortable lining which comprises an inner pipe and an outer ring arranged on the periphery of the inner pipe, and further comprises an inner ring, an inserting piece, a first rubber layer, a second rubber layer and a third rubber layer which are arranged between the inner pipe and the outer ring, the inner ring is arranged on the periphery of the inner pipe, the first rubber layer is arranged between the inner pipe and the inner ring, and the second rubber layer is arranged between the second rubber layer and the third rubber layer. The inserting piece is arranged on the periphery of the inner ring, the second rubber layer is arranged between the inner ring and the inserting piece, and the third rubber layer is arranged between the inserting piece and the outer ring. The inner ring is tubular, and the insertion sheets are arc-shaped sheets. Deformation of a large torsion angle can be achieved, the durability of the bushing is greatly improved, the rigidity of the bushing can be adjusted due to the receding structure, and the driving comfort is improved.

An active control system for suppressing swing and sway behaviors includes a first motor, a rotating plate, a sensor and a controller. The first motor is provided on a to-be-controlled object. The rotating plate is provided on the first motor. The controller is connected to the sensor and the first motor. The sensor is configured to detect a torsional angle of the to-be-controlled object and send the torsional angle to the controller. The controller is configured to process the torsional angle and output a control instruction to the first motor based on a processing result, so as to control the first motor to drive the rotating plate to rotate.

The invention discloses a torsional angle measurement auxiliary device and a use method, the device comprises two chucks, and each chuck comprises a plurality of driving wheels, a driven plate, two guide plates and a plurality of fastening clamps. The driven plate is clamped between the two guide plates, the driving wheel is located on the outer side edges of circular rings of the two guide plates and penetrates through the two guide plates, the driven plate is meshed with the driving wheel through a gear on the outer circumference of the driven plate, and the driving wheel, the driven plate and the guide plates are assembled and fixed through a plurality of screws. The chuck is connected with a to-be-tested piece, the driving wheel is rotated, and the to-be-tested piece is clamped by the fastening clamp through the gear and the guide groove; and starting the torsion testing machine to perform a torsion experiment, and measuring a torsion angle by means of a photoelectric encoder. All the fastening clamps are tightened at the same time in a gear rotating mode, the coaxial requirement is automatically met in the fastening process, the experiment operation difficulty is lowered, and the experiment steps are simplified. The phenomenon of eccentric compression easily generated when a single pressure head is fastened is avoided, the chuck is prevented from warping, pressure head hole notches are prevented from being damaged, and the durability of the device is improved.

The invention belongs to the technical field of torsion guides, and particularly discloses an auxiliary device for adjusting the torsion angle of a torsion guide in a bar production line, which comprises a base, an angle ruler, a measuring plate and a bolt, a fixed seat is arranged on the base, through holes are formed in the angle ruler and the measuring plate, and the bolt movably penetrates through the through holes and is in threaded connection with the fixed seat. The base is provided with a concave body used for supporting the bevel protractor and the measuring plate, and the base is provided with a locking structure used for clamping the torsion guide. The problem that steel materials cannot enter the next machine frame easily due to the fact that the torsion angle is adjusted through manual experience, and steel piling accidents are caused is solved. The angle ruler and the measuring plate are matched with the sample rod for angle measurement and adjustment, compared with traditional adjustment depending on artificial experience, angle deviation caused by experience difference can be effectively avoided, and the adjustment quality is improved.

The invention belongs to the technical field of automobile safety collision test dummies, and particularly relates to a dummy bionic lumbar vertebra structure for testing. Comprising an upper connecting plate, a lumbar vertebra body, a torsion assembly, a lumbar vertebra body, a torsion assembly, a lumbar vertebra body and a lower connecting plate which are sequentially arranged from top to bottom, and further comprises multiple sets of steel cable pre-tightening devices used for connecting the lumbar vertebra body, the torsion assembly and the upper connecting plate / lower connecting plate in a segmented mode. The three lumbar vertebra bodies are made of polyurethane, a lumbar vertebra structure formed by the three lumbar vertebra bodies has the bending radian needed by the lumbar vertebra, and the torsion assembly body is made of alloy, provides support for the lumbar vertebra structure and controls the torsion angle of the lumbar vertebra structure. According to the invention, the mechanical movement mechanism is added to control the lumbar vertebra movement state, and the dummy lumbar vertebra better fitting the real human body lumbar vertebra movement state is obtained, so that the result of automobile collision test data acquisition is more accurate and effective, and the human body injury can be better evaluated.

The invention discloses a torsion bar detection tool and automatic detection equipment. The tool comprises a fixing assembly and a torsion detection assembly. According to the fixing assembly, two fixing blocks with half tooth grooves are folded to form a first tooth groove meshed with a first tooth part of the torsion bar, and reliable fixing is achieved. The torsion detection assembly comprises a torsion block which is rotatably assembled on the installation seat, and the torsion block is provided with a second tooth groove which can be installed in the second tooth portion of the torsion bar in the radial direction and a lever arm which extends in the radial direction. The mounting seat is provided with a detection module and a driving module which act on the two ends of the lever arm respectively. The driving module drives the lever arm to drive the torsion block to rotate, and the detection module accurately obtains the torsion angle by measuring the displacement of the lever arm and based on lever ratio conversion. The tool is fast in clamping, reliable in positioning and high in detection precision. Corresponding automatic equipment is integrated with the tool, and automation of the whole process of automatic feeding, correction, function detection, appearance reinspection and intelligent sorting of the torsion bar is achieved.

The invention relates to a blade (20) for a rotor capable of rotating about an axis of rotation (AX), said blade (20) extending along a pitch axis (AXPAS) from a first end (51) to a second end (52), the blade (20) comprising a blade body (25) having a series of sections (S) substantially perpendicular to the pitch axis (AXPAS) from the first end (51) to the second end (52). The blade (20) has sections along its pitch axis with a chord that increases and then decreases, a relative thickness that decreases from an initial section (SINI) to a final section (SF), a torsional angle that continuously increases and then decreases from an initial section (SO) to the initial section (SINI), and an offset that varies with respect to the pitch axis.

The invention discloses a torsion test torsion angle measuring device which comprises a sample and an encoder, and a rotating shaft of the encoder is coaxially connected with the sample through a connecting frame, so that the rotating shaft can coaxially rotate along with the sample; the encoder is configured to acquire a torsion angle signal of the sample through rotation of the rotating shaft. According to the measuring device disclosed by the invention, the rotating shaft of the encoder is directly and coaxially connected with the sample, so that errors in traditional indirect measurement can be effectively eliminated, and in-situ high-precision measurement of the torsion angle can be realized. Due to the direct connection mode, the measurement sensitivity of small torsional deformation is remarkably improved, and the small angle change of the sample when the sample is close to the fatigue limit can be accurately captured; meanwhile, the measurement process is simplified, attenuation and interference in the signal transmission process are avoided, and the obtained torsion angle data can more truly reflect the initiation and development states of cracks in the sample.

The present invention relates to the technical field of tunnel segment data monitoring and analysis, and relates to a data monitoring and analysis method for a shield tunnel segment loading test platform. The present invention captures the position coordinates of the identification points in the segment joint area and decomposes them into normal, tangential and rotational displacement components, thereby achieving real-time synchronous quantification of the joint opening, dislocation and torsion angle. At the same time, based on the timestamp alignment technology, the historical test data and the real-time sequence are integrated, and the segment joint deformation evolution trend diagram is predicted through multi-parameter coupling. Combined with the real-time sequence, a collaborative judgment is made to generate a segment joint area deformation hazard index, thereby achieving dynamic and accurate prediction of the deformation trend and accurate assessment of the hazard level. The identified maximum curvature position and curvature change rate are correlated with the segment joint area deformation hazard index for analysis, and the segment structure safety margin is output, triggering a multi-level early warning mechanism, thereby comprehensively evaluating the overall structural safety status of the shield tunnel segment.

This invention relates to a device and method for measuring the torsional torque of a helicopter torsion bar, comprising: a mounting base, with a support area formed on the upper part of the mounting base, the support area having a central support located in the middle and side supports symmetrically arranged on both sides, the central support restricting the Z-axis degree of freedom of the torsion bar; a torsion part, rotatably connected to the side supports, the rotation angle α being the torsion angle of the applied force, and the torsion part fixing both ends of the torsion bar, becoming an integral part with the torsion bar, and restricting the X-axis and Y-axis degrees of freedom of the torsion bar; a pre-set rotation hole for a torque wrench on the torsion part; and a locking part, the locking part locking the torsion part and the side supports, the torque wrench rotation directly measuring the torque corresponding to the torsion angle. This device can directly measure the torsional torque of the torsion bar without complex calculations, the measurement is simple, and the results are easier to obtain. Compared with indirect measurement methods, the measurement method of this invention is simple to operate, provides intuitive results, is low in cost, requires less manpower, and is economical.

The present application relates to a kind of cantilever end torsion angle prediction method, control method, system and medium, it is related to end torsion angle prediction and control technical field.Prediction method, based on the stiffness of the obtained bridge, section inertia moment, section shear modulus, section torsion constant and cantilever curved bridge structure dead weight, the undetermined coefficient of the trigonometric series of cantilever end deflection and torsion angle is calculated, and further the cantilever end torsion angle and deflection are calculated.Compared with prior art, the relationship between structure parameters and cantilever end rotation angle can be directly reflected, so that parameter sensitivity analysis and engineering optimization design can be facilitated, and the applicability of the project is improved.

The invention relates to a holder for receiving a contact element. The invention relates to a holder for receiving a contact element for an electrical plug connector, comprising a fastening region for fastening the holder to the contact element, and a spring region axially adjoining the fastening region and for contacting a contact spring arm of the contact element with a spring force. The cage also has a cover region which axially adjoins the spring region and serves to cover the insertion end of the contact element. A hole is formed in the spring region, and a rib is arranged in the hole. A first axial end of the rib is connected to the fixed region and a second axial end of the rib is connected to the cover region. Starting from the first axial end and from the second axial end, the rib is twisted in each case at a torsion angle [phi] R, [phi] R'with respect to the longitudinal axis of the rib such that the contact spring arm can be brought into contact with the contact point of the rib with a spring force.