65 results about "Straight segment" patented technology

The invention discloses a super-large broken line glass curtain wall installation method which comprises the following steps: based on curtain wall design parameters, obtaining deformation trends of a curtain wall in different installation stages, and based on the deformation trends, respectively determining deformation control thresholds of a straight line section component and a broken line node component of the curtain wall; adjustable hydraulic supporting tools are arranged in the installation area of the linear segment component and the installation area of the broken line node component respectively, and the adjustable hydraulic supporting tools are used for supporting glass plates of the linear segment component and the broken line node component; and staged installation is carried out according to the time sequence that the linear segment components are installed firstly and then the broken line node components are installed. Deformation trends of different installation stages are obtained in advance based on curtain wall design parameters, differentiated deformation control threshold values are set for the straight line section component and the broken line node component, and refined control over the rigidity sudden change area at the broken line node is achieved; the adjustable hydraulic supporting tool is arranged, and the supporting force is dynamically adjusted through the hydraulic rod.

The utility model provides a sliding block component of a buffering sliding door and a buffering device, and is applied to the technical field of buffering sliding doors, the sliding block component is arranged in a sliding groove of a buffering frame in a sliding mode and connected with a buffering component, the sliding groove comprises a linear section and an arc section, and the sliding block component slides and rotates in the linear section and the arc section; and a connecting part is arranged at the rotating center, rotating in the arc section, of the sliding block part and used for being hinged to the buffering part, so that the buffering sliding door has the beneficial effects of being stable in structure and not prone to deformation.

1. The name of the design product: the side surface of a uniaxial robot. 2. The use of the design product: the uniaxial robot is used for automation equipment, and the side surface of the uniaxial robot serves as one side of the uniaxial robot. 3. The design points of the design product: the combination of shape and pattern. 4. The picture or photo that best indicates the design points: perspective view. 5. Other circumstances that need to be explained: the main protection of the design product is the partial design of the uniaxial robot. The gray part is the part claimed by the partial design, and the claimed design does not include the gray color, but includes the straight line segment green color arranged on the gray part. The blue part is the part not claimed by the partial design.

The application relates to the technical field of motion planning, and discloses a corner fairing method of an asymmetric Airthoid-arc, which comprises the following steps: constructing a tool path fairing curve which is sequentially connected by a first Airthoid curve, an arc and a second Airthoid curve, and is used for fairing a corner formed by adjacent straight line segments; preliminarily setting a first transition length and a second transition length according to the lengths of the line segments on the two sides of the corner; solving the first and second tangent angles according to geometric constraints, tangential continuity, curvature continuity constraints and position continuity constraints; if there is a solution, analytically calculating a current approximate error; and finally analytically calculating the curvature extreme value and the arc length of the fairing curve. The asymmetric curve structure is adopted, the corner space is fully excavated, the curvature extreme value is small, the arc length can be analytically expressed, and the profile error is controllable, so that the numerical control machining efficiency is improved.

An inner curve type PPU robot is characterized by: further comprising a support block, the support block being disposed inside three support bearings, and an oscillating contour surface being formed on the outer side of the support block, the oscillating contour surface comprising two symmetrically arranged C-shaped contour surfaces, the C-shaped contour surface comprising an arc segment and straight segments at both ends of the arc segment, and the distance of the arc segment from the rotation center of the main shaft being greater than the distance of the straight segments from the rotation center of the main shaft; when the oscillating wheel moves, the three support bearings and the oscillating contour surface are always in contact to form a rolling fit, and the oscillating wheel drives the linkage shaft to move along the C-shaped trajectory. Its advantages are: 1. The support block is set inside the three support bearings. Compared with the cycloidal frame in the prior art, the outer curved surface is changed to the inner curved surface, making the structure more compact and reasonable, and greatly reducing the volume; 2. The C-shaped contour surface includes an arc segment and two straight segments. Compared with the rounded square trajectory in the prior art, the movement of the swing wheel will be more continuous; 3. The support bearing has a higher speed and greater torque when passing through the straight segment, which reduces the influence of gravity and makes the movement more stable. The support bearing has a lower speed and faster speed when passing through the arc segment, which increases the running speed and makes the movement more rapid.

The present application relates to the technical field of numerical control machining.A three-axis linkage operation method capable of self-adapting to realize arbitrary orientation movement includes the following steps: the whole process is virtually three straight line movements: ABE, EF and FCD, and the velocities, accelerations and the like of each endpoint A, E, F and D are all 0, the BE segment is pure deceleration movement, FC is pure acceleration movement, and they perform superimposed movement with EF in different time periods, so that the intermediate "frogs' leap" curve is obtained AB +t EF +t CD . Wherein A, B, C and D are four fixed points initially set according to machining requirements, A and D are respectively start and end points, AB and CD are respectively linear segments with limited trajectories, and E and F are respectively points on the extension lines of the linear segments AB and DC. The technical scheme of the present application realizes the shortest whole process movement time of the movement target, has no large corner in the movement process, has no frequent deceleration processing, and has short operation time.

The application relates to the technical field of cutting tools, in particular to a cutting blade and a cutting tool. The cutting blade comprises a central shank and a cutting head; the cutting head comprises a rake face, a relief face, a bottom face and a chip breaking structure located on the rake face; a cutting edge formed by the rake face and the relief face comprises two edge straight line segments formed by a first rake face and the relief face, two first edge circular arc segments formed by a first circular arc transition face and the relief face and a second edge circular arc segment formed by a second rake face and the relief face; when viewed along the length direction of the central shank towards the relief face, the middle part of the second edge circular arc segment is concave downwards, and the two sides are connected to the edge straight line segments upwards through the first edge circular arc segments. The cutting edge of the application is concave in the overall shape, effectively reduces the cutting resistance during cutting processing, thereby inhibiting the vibration between the cutting edge and the workpiece and improving the machining precision. The cutting blade has certain edge strength while ensuring the sharpness of the edge.

A staple includes a crown section including a first curve, a second curve, a third curve, a first straight segment extending between the first curve and the second curve, and a second straight segment extending between the first curve and the third curve. The second curve and the third curve define, respectively, opposite ends of the crown section. The staple includes a pair of leg sections extending from the opposite ends of the crown section.

The utility model discloses a space avoidance hinge in the hardware technical field, including door frame, door board and hinge module, the door board is assembled in the door frame inside through the hinge module with axial connection mode, the hinge module contains mirror image symmetry's upper hinge group, lower hinge group, in the upper hinge group, the integrative first upper hinge processes the inside, outside limit guide rail that is parallel to each other, and two movable bearings of second upper hinge installation are accurate adaptation with it, and the bottom of door frame is equipped with the adaptation sink groove, and forms double positioning with the outside limit guide rail, through such structural design, can firm connection door board and door frame and accurate guidance door board movement, when door board opening, first along the guide rail straight line section smooth translation, and then along the arc segment smooth rotation to 90 degrees, make door board thickness completely hide, this design not only has promoted the space utilization, also satisfies the strict requirement of high sealing place, has improved the defect of traditional hinge in space utilization and sealing performance greatly.

The present application relates to the technical field of sealing strip rubber sleeve conveying, and discloses a sealing strip rubber sleeve conveying device and a conveying method, the conveying device comprising: a rubber sleeve conveying belt, the rubber sleeve conveying belt comprising: a plurality of straight line segments, in polygonal distribution. The present application places a plurality of rubber sleeves on the first straight line segment in sequence, so that the plurality of rubber sleeves are conveyed along the plurality of straight line segments and the plurality of arc-shaped segments, and finally the plurality of rubber sleeves are arranged on the plurality of straight line segments respectively; since the plurality of straight line segments and the plurality of arc-shaped segments form a rotary structure, the corners of the plurality of rubber sleeves can be all directed towards the center of the rotary structure. The rotary structure can change the direction of the corners of the rubber sleeves, and no additional reversing line body is needed; the conveying device is highly integrated, occupies a small area, and greatly reduces the investment cost required by the device.

The invention relates to the technical field of metal processing and mechanical manufacturing, and discloses a pipe cutting device for frame production, which comprises a table top, a support rod I, a support rod II, a cutting knife, a reciprocating transportation mechanism and a rotary cutting mechanism, and is characterized in that the reciprocating transportation mechanism is arranged to synthesize composite motion with a specific time sequence, so that the cutting efficiency is improved; horizontal feeding and vertical jacking and falling actions are fused in a compact cycle; when the small gear rolls along the straight line section of the circular gear column, accurate horizontal pushing of the pipe material is achieved, and the accuracy of fixed-length feeding is ensured; when moving to the arc-shaped sections at the two ends of the special-shaped sliding groove, the combined gear mechanism triggers the vertical displacement of the whole combined gear mechanism, the upper supporting plate is jacked up or put down through the long rod, grabbing and releasing of pipes are completed, an independent lifting driving element can be omitted, and more importantly, strict synchronism and high repeated positioning accuracy of the feeding process and the cutting action are guaranteed; and the cutting length error and the equipment clamping stagnation risk caused by unstable feeding are fundamentally overcome.

The application relates to a high-continuity appearance surface processing technology and device, and belongs to the technical field of surface processing, and comprises the following contents: S1: curvature distribution data of a charging port cover edge is acquired in real time through three-dimensional laser scanning, and a partition geometry model containing a straight line segment, a small fillet segment and a large fillet segment is established; S2: based on the curvature distribution data, polishing assembly is adjusted to adaptively adjust polishing areas of the straight line segment, the small fillet segment and the large fillet; S3: based on the partition geometry model, the polishing assembly is adjusted to polish the straight line segment, the small fillet segment and the large fillet segment in sequence, through a curvature-adaptive dynamic processing system, a technical bottleneck of traditional fixed-parameter polishing is broken, high precision of a complex curvature surface is realized, and the high-continuity appearance surface requirement of the charging port cover can be guaranteed.

The invention relates to a retaining device (201) comprising a base (202) having at least one retaining pattern (M) comprising at least two retaining zones (207, 207a, 207b, 207c, 207d, 207e, 207f), each provided with retaining elements (205), the retaining pattern being delimited by two opposite longitudinal edges (212a, 212b), the two retaining zones being arranged in such a way that any straight segment (L) extending in a second direction (Y) from a first longitudinal end edge (209a) to a second longitudinal end edge (209b) crosses at least one of the two retaining zones, the base comprising at least one zone without retaining elements (208, 213a, 213b) and having at least one transverse portion (208) extending continuously on the first face (203) of the base (202) from a first longitudinal edge (212a) to a second longitudinal edge (212b) of the retaining pattern.

The utility model relates to a system for preventing deviation of strip steel, which comprises spindle rollers which are arranged at wrap angle positions of a unit and the strip steel and used for deviation correction of the strip steel of the unit. The middle of the spindle roller adopts a flat roller body, the two sides of the spindle roller symmetrically adopt roller shapes composed of linear sections, and one ends of the linear sections are connected with the middle flat roller body. The device has the advantages that the spindle rollers can be arranged on all the rollers which can form a certain wrap angle with the strip steel in the unit, the strip steel can be automatically rectified by utilizing the wrap angle and the tensioning force of the strip steel and the rollers, a photoelectric detection and hydraulic rectifying system is not needed, the production and operation cost is saved, and the equipment maintenance amount is reduced; the spindle-shaped roller adopts a structure that a middle flat roller body is combined with a linear section, so that the phenomenon that the middle of the strip steel is stretched out of other parts in the width direction due to the action of unit tension in the running process of the strip steel because the convexity of the middle part of the roller is concentrated at one point is avoided.

The utility model discloses a V-shaped ring mould which comprises an upper mould, an upper mould core and a lower mould, the parting positions of the upper mould and the lower mould are on an inclined plane, the parting positions of the upper mould and the lower mould are respectively provided with a straight line section, the straight line section of the upper mould is a transverse line, and the straight line section of the lower mould is a vertical line. And the rubber can be prevented from being damaged and scratched due to excessive extrusion in the mold opening process of the sealing ring.

The invention discloses a combined coil framework with a circular arc and straight line section, and belongs to the technical field of electromagnetic coil manufacturing. The framework is suitable for all structures with the sections combined by arc sections and straight line sections, and the improved scheme that an original straight line section is replaced by a large arc structure is adopted for solving the problems that when a traditional framework is wound, the straight line sections lose support, and the curvature of a transition area changes suddenly, and consequently a winding material is loose and hollow is adopted; the framework still keeps the original approximate form, and through continuous supporting of the arc end-large arc connecting structure, it is guaranteed that winding materials (superconducting tapes, copper wires and the like) are tightly attached in the whole process, and the problems of looseness and cavities are thoroughly solved. According to the design, the electromagnetic performance, the mechanical stability and the heat dissipation effect of the coil can be improved, existing winding equipment and technology do not need to be changed, various framework types and winding materials are adapted, practicability is high, and popularization is convenient.

The utility model discloses a screw taking-out device, which belongs to the technical field of aeronautical manufacturing and maintenance and comprises a sleeve, a locking ring, a cylindrical rolling shaft and the like, the cross section of an inner hole of the sleeve is a triangle-like shape formed by connecting three linear sections and three arc sections at intervals, the locking ring is provided with three strip-shaped cylindrical rolling grooves, and the cylindrical rolling shaft is arranged in the cylindrical rolling grooves. And the two are combined and then placed and limited in the inner hole of the sleeve. During use, the screw rod is inserted among the three cylindrical rolling shafts in the locking ring, the outer sides of the cylindrical rolling shafts are adjacent to the arc section of the inner hole in a non-extrusion state, the sleeve is rotated, the cylindrical rolling shafts slide to the linear section of the inner hole under the friction force action of threads of the screw rod, the screw rod is clamped by the cylindrical rolling shafts, and the sleeve is continuously rotated to screw out the screw rod. When the screw rod is disassembled, torque applied to the screw rod acts on the axis of the screw rod, the screw rod is prevented from being broken in the rotating and taking-out process, the quality of a product fastened by a bolt is guaranteed, and meanwhile the disassembling work efficiency is not affected.

The invention discloses an extensible constellation construction method and system and a signal transmission method, and belongs to the technical field of communication. The extensible constellation construction method comprises the following steps: taking two parallel straight line segments in a three-dimensional space as geometric basic units; rotating one straight line segment in the geometric basic unit to be perpendicular to the other straight line segment in the horizontal plane, and compressing the distance between the two straight line segments in the geometric basic unit in the vertical plane to obtain a parallel cross geometric structure; generating a candidate constellation point set on a constellation basic skeleton by taking the parallel cross geometric structure as the constellation basic skeleton; screening the candidate constellation point set according to a preset minimum Euclidean distance to obtain a constellation point set; and generating an extensible constellation diagram according to the constellation point set. According to the method, on the premise of strictly guaranteeing the minimum distance, unified construction of multi-order constellations under the same process is achieved, the symbol energy utilization rate and CFM are remarkably improved, and meanwhile design efficiency and result reproducibility are considered.

The invention discloses a tool cutting edge angle planning method for a five-axis machine tool, which belongs to the technical field of numerical control machine tools and comprises the following steps: S1, setting a machining coordinate system, and designing a tool path of a profile curve of a part; s2, starting from the position of the trigger instruction for calculating the angle planning of the cutting edge of the cutter, segmenting the curve point into N straight line segments according to the curve point; s3, setting a tool setting direction; s4, calculating the cutting edge angle of the cutter; s5, determining an actual cutter cutting edge angle, and completing cutter cutting edge angle adjustment through a main shaft positioning instruction of the machine tool; s6, at the position of the trigger instruction for finishing calculation of the cutting edge angle planning of the cutter, finishing angle planning, and moving according to a five-axis linkage mode; and S7, the steps from S1 to S6 are repeated, and machining of all contours of the whole part is completed. When the five-axis machine tool is used for machining a complex curve contour, the cutting edge of the cutter always faces the advancing direction of the cutter, and the contour machining quality of parts is improved.

Detects the amount of wear on railway tracks. [Solution] This rail wear detection device detects the amount of wear on a railway rail and includes: a generation means (101) that generates a pseudo-contour of the cross-section of a railway rail based on point cloud data included in a region of a predetermined length in the longitudinal direction of the railway rail from three-dimensional point cloud data of a railway track including the railway rail; a identification means (102) that identifies pseudo-straight sections, which are characteristic parts of the rail included in the pseudo-contour; a fitting means (103) that matches the pseudo-straight sections, which are characteristic parts of the rail included in the pseudo-contour with the reference straight sections, which are characteristic parts of the reference contour obtained from the cross-sectional shape of a standard rail, and superimposes the pseudo-contour and the reference contour; a detection means (104) that detects the amount of wear on the railway rail based on the difference between the superimposed reference contour and the pseudo-contour; and a registration means (105) that collects the data obtained from the railway rail wear detection process and registers it in a dataset.

A method for producing a ground product (20) with a smaller diameter than that of a grinding object (10) by grinding the side surface of the grinding object having a polygonal columnar or cylindrical shape, wherein the method for producing a ground product (20) comprises the following steps: (a) arranging a cup grinding wheel (30) comprising a lateral grinding wheel part (36) arranged on the side surface of a cup (32) and a lower grinding wheel part (38) arranged on the lower side of the cup (32) such that the central axis (30a) of the cup grinding wheel (30) is orthogonal to the central axis (10a) of the grinding object (10), or such that the central axis (30a) of the cup grinding wheel (30), starting from a state in which the central axis (30a) of the cup grinding wheel (30) is orthogonal to the central axis (10a) of the grinding object (10),is offset in parallel; and (b) axially rotating the cup grinding wheel (30) so that the cup grinding wheel (30) grinds the side surface of the grinding object (10) while the grinding object (10) is axially rotated and moved in the axial direction, thereby fine grinding the outer circumferential surface of the grinding object (10) by means of the lower grinding wheel part (38) while simultaneously coarse grinding the grinding object (10) by means of the lateral grinding wheel part (36) to obtain the ground product (20), wherein in step (a) the cup grinding wheel (30) is such that the lower grinding wheel part (38) is arranged annularly along the outer circumference of the lower side of the cup (32), and in step (a) the central axis (30a) of the cup grinding wheel (30) is adjusted from a state in which the central axis (30a) of the cup grinding wheel (30) is orthogonal to the central axis (10a) of the grinding object (10) is,parallel offset and the central axis (30a) of the cup grinding wheel (30a) is offset such that when the central axis (10a) of the grinding object (10) is projected onto the lower grinding wheel part (38) of the cup grinding wheel (30), a single straight segment appears on the lower grinding wheel part (38), and such that the length of the straight segment is greater than or equal to Lmax / 2 and less than or equal to Lmax, where Lmax is the length of the straight segment when the offset is such that the straight segment is a tangent touching the inner circumference of the lower grinding wheel part (38).

The utility model discloses a small eave steel support machining mould which comprises a bottom frame, a side limiting piece, a transverse supporting piece and an inclined position adjusting piece, the side limiting piece, the transverse supporting piece and the inclined position adjusting piece are connected to the bottom frame, a vertical component is supported and limited through the side limiting piece, a transverse component is upwards supported and laterally limited through the transverse supporting piece, and a C-shaped piece is adjusted through a rotatable rotating plate. By means of the machining mould, angle steel supports which are designed to be the same in size and have the same straight line segment specification and size can be rapidly machined in batches in a factory, line production can be formed, the manual operation process is simple, the precision error value is controllable, and the production efficiency is improved. The time for manual moving and repeated assembling and aligning can be saved to a certain extent, and the working efficiency and the welding quality are improved.

The automatic appliance transfer system comprises appliances and a transfer line, the appliances are used for containing workpieces, and the multiple appliances can be connected end to end in a hanging mode; the transfer line comprises a straight line section A, a transverse moving section and a straight line section B which are sequentially connected, the straight line section A is provided with a straight line pushing device A, the straight line pushing device A is used for pushing the appliances to move forwards one by one, and an unlocking device is arranged on the other side of the transfer line and matched with the sinker bar to be used for enabling the forefront appliance to be disengaged from the second appliance; the transverse moving section is provided with a transverse moving trolley, and the transverse moving trolley is used for transferring the appliance from the straight line section A to the straight line section B; the linear section B is provided with a linear pushing device B, a guide rail matched with the guide wheel is arranged on the ground of the linear section B, and the appliance moves along the guide rail after leaving the linear section B; full-automatic transfer of logistics appliances is achieved, manual intervention is not needed, high-beat production is achieved, and the production efficiency of a production line is improved.

This invention proposes a refrigerator, belonging to the field of household appliance technology. The refrigerator includes a door, a door shell, and a protrusion extending inward from the door shell. A first guide groove and a second guide groove extend from the end face of the door shell to the protrusion. The thickness of the door shell is L1, and the minimum wall thickness between the first and second guide grooves is H2, where H2 = (0.5~1)H1. When the door is rotated open from a closed state to a first state, the movement trajectory of the first guide shaft relative to the first guide groove consists of a first straight line segment and a first curved segment. Simultaneously, the movement trajectory of the second guide shaft relative to the second guide groove consists of a second straight line segment and a second curved segment. The first straight line segment extends away from the front wall and closer to the side wall, causing the door to move inward a first distance and forward a certain distance. The first curved segment extends towards the side wall and the front wall, causing the door to move inward a second distance. The hinge structure of this refrigerator ensures that the door does not extend beyond or excessively beyond the side of the refrigerator body when opened.

1. The name of the design product: the side surface of a uniaxial robot. 2. The use of the design product: the uniaxial robot is used for automation equipment, and the side surface of the uniaxial robot is used as one side of the uniaxial robot. 3. The design points of the design product: the combination of shape and pattern. 4. The picture or photo that best indicates the design points: perspective view. 5. Other circumstances that need to be explained: the design product is a partial design. The gray part is the part claimed by the partial design, and the claimed design does not include the gray color, but includes the green color of the straight line segment arranged in the gray part. The blue part is the part not claimed by the partial design.

A fastening system includes a pivot pin including a head portion; an unthreaded shoulder portion extending from the head portion; and a threaded portion extending from the unthreaded shoulder portion. The head portion includes slots in which each slot includes an inner curved portion and a pair of straight segments extending outward from opposite sides of the inner curved portion.

The embodiment of the invention provides a defect metamaterial and a preparation method thereof, and relates to the technical field of metamaterial manufacturing. The method comprises the following steps: based on an initial TPMS (Tire Pressure Monitor System) structure, constructing an initial triangularization grid limited by a predetermined straight line segment in a tetrahedron; by introducing new vertexes and increasing boundary straight line segments, the defect level of the grid is improved, and a plurality of non-overlapping triangular patches formed by connecting the original vertexes and the new vertexes are formed; performing iterative evolution and Bonnet rotation on the grid according to an energy criterion to obtain a TPMS conjugate surface limited in a tetrahedral cell element; and generating a TPMS unit cell structure along the surface of the basic tetrahedron in a mirror symmetry manner by utilizing the symmetry of the initial structure. According to the method provided by the embodiment of the invention, the specific stiffness and specific strength of the deficient metamaterial under low density are remarkably improved, the industrial problem that the mechanical property of the deficient metamaterial is sharply attenuated along with the reduction of the density is solved, and the process bottleneck that residues such as uncured resin / unsintered powder are difficult to discharge in additive manufacturing is thoroughly solved.

The utility model relates to the technical field of bicycle goods shelves, in particular to an integrated die-casting goods shelf which comprises a goods shelf set, a base body formed in an integrated die-casting mode and connecting pipe sets arranged on the front side and the rear side of the bottom of the base body, and the left side and the right side of each connecting pipe set are provided with a straight pipe connecting part and a bent pipe connecting part respectively. The foot stool group is provided with a first foot tube group and a second foot tube group, a first straight line section and a first inclined section are respectively arranged at the connecting parts of the first foot tube group and the straight tube connecting part and the bent tube connecting part, and a second straight line section and a second inclined section are respectively arranged at the connecting parts of the second foot tube group and the straight tube connecting part and the bent tube connecting part; and the first straight line section and the first inclined section of the first foot tube group and the second straight line section and the second inclined section of the second foot tube group are respectively connected with the connecting part of the straight tube connecting part and the bent tube connecting part of the connecting tube group through a screw lock structure or a welding structure. The support force of the seat body is relatively strong, and the foot stool group can be assembled into different colors and shapes, so that the novelty is increased, and the buying desire of consumers is improved.

The utility model relates to a clutch, in particular to a clutch separating device which aims to solve the technical problem that in an existing separating system, a separating shifting fork is prone to eccentric wear and clamping stagnation in the working process. The device comprises a release bearing and a release shifting fork, one end of the release shifting fork is provided with a pair of shifting fork arms, the ends of the pair of shifting fork arms are located on the two sides of the release bearing respectively, and the two sides of one end of the release bearing are each provided with a protruding block part. Each C-shaped tension spring comprises a first straight line section, a bent connecting section and a second straight line section which are connected in sequence; the two protruding block parts are respectively provided with a first positioning hole, and the pair of shifting fork arms are respectively provided with a second positioning hole. The pair of C-shaped tension springs is connected with the convex block parts on the same side through the first linear sections and the first positioning holes, and is connected with the shifting fork arms on the same side through the second linear sections and the second positioning holes; and gaps are formed between the opposite end surfaces of the pair of shifting fork arms and the release bearing.