CN102530501A - Cantilever-type transportation method - Google Patents

Abstract

The invention relates to a cantilever-type transportation method and in particular relates to a method of a cantilever-type linear transportation and transmission device. The cantilever-type linear transportation and transmission device mainly comprises critical components such as an outer sleeve, a middle sleeve, an inner sleeve, a roller path, a roller path driving mechanism, circulating balls and the like; the cantilever-type linear transportation and transmission device operates by adopting the way that multiple sleeves are mutually sheathed and the roller path winds the sleeves to circulate, and objects are cantilevered and transported; and the cantilever-type linear transportation and transmission device has a bidirectional movement function of linear motion and axial rotation, i.e., the objects can be transported by adopting a single linear motion manner, and also can be transported by adopting a rotary feed manner.

Description

Cantilevered is transported method

The present invention relates to a kind of mechanical mechanism, especially is the linear transportation act of operation main body with the circulation raceway.

Background technology:

In reality production and the life, usually need object encorbelmented transports or regains, yet common cantilever mechanism all is provided with structure parts such as pulley at cantilever end, and then carries article with modes such as chain tractives; This type of mechanism loosely organized is not easy to accurate operation, if with, in time, require to be handled upside down thing again spinning movement is arranged, and is then more powerless.

Summary of the invention:

The cantilevered that the present invention relates to is transported method, adopts the mode that the many raceways that socket-connect, circulate twine sleeve circular flow to transmit the thing of encorbelmenting, and possesses motion of translation and axial rotatory power, the two-way vertically material that transports simultaneously; This apparatus structure is compact, can realize precisely transporting, speed governing is transported, rotate and transport etc.

This cantilevered is transported the mechanical mechanism of method, mainly forms (Fig. 1) by parts such as outer sleeve, middle sleeve, inner sleeve, circulation raceway, raceway drive system, circulating balls; Encorbelment with outer sleeve, inner sleeve and circulation raceway conveyor screw and to transport object.

Middle sleeve is the carrier and the support of circulation raceway, outer sleeve, inner sleeve, is installed on the frame frame rotation relatively; Outer sleeve is set in outside the middle sleeve, and inner sleeve is installed in the middle sleeve; Establish the circulation raceway between outer sleeve, inner sleeve and the middle sleeve, establish circulating ball between circulation raceway and outer sleeve, inner sleeve, the middle sleeve; Drive systems circulation raceway is along the middle sleeve operation of spiraling, and ball rolls between raceway and each sleeve, transmits the bearing capacity of middle sleeve to inner and outer sleeves.

Two conveyor screws spiral in the opposite direction, inside and outside the middle sleeve two ends, connect, and transition each other forms closed ring (Fig. 3, Fig. 4); Establish the raceway (Fig. 8) of circulating ball on the bottom land of the raceway groove on the sleeve, the two side; Ball is entrenched between raceway and the cell wall; Ball serves as to support raceway is produced radial support power, axial thrust with the raceway cell wall, keeps raceway conveyor screw shape and promotes its axial operation; The raceway that is circulating drives ball along the rolling of the screw-shaped ball grooves on inner sleeve, outer sleeve circulation, and then drives the axial motion of inside and outside sleeve, realizes the purpose with inside and outside sleeve carrying article.

The operation of raceway, the driving of leaning on drive system.Drive system is installed on the frame, mainly is made up of power gear, synchronizer gear, axle drive shaft (tooth); Power gear drives synchronizer gear and rotates, and synchronizer gear drives each axle drive shaft (end tooth wheel) synchronous variable-speed and rotates, and each axle drive shaft drives raceway simultaneously, makes the raceway rotation.

Axle drive shaft (axle drive shaft, tooth) adopts friction, tooth mesh power transmission modes such as (Fig. 6) to the type of drive of circulation raceway; Axle drive shaft is made up of end tooth wheel, axle drive shaft, driving gear (or friction roller); Axle drive shaft is located between frame and the conveyor screw, is installed on the frame, and the one of which end is encorbelmented and exposed outside the conveyor screw, the installation end gear; Synchronizer gear engagement on end tooth wheel and the frame is delivered on the raceway (inside and outside conveyor screw all can be used as the access point of power) (Fig. 2) with the power on the power gear through driving gear; Driving gear (or friction roller) is located in the frame and forms circumscribed (if be chosen in when driving on the inside spin body, then being inscribe) with the raceway conveyor screw, and rotary power is delivered on the conveyor screw, forms the peripheral force that drives the conveyor screw rotation.

It is on axle drive shaft, to establish the gear teeth that engagement drives, and on the raceway bar, establishes tooth bar, and both mesh power transmission; Conveyor screw is formed peripheral force; The promotion conveyor screw rotates, and then passes through the mutual transition of internal and external screw body, forms the inside and outside spirochetal closed cycle of raceway (Fig. 5, Figure 12); Frictional transmission is to replace the gear teeth on the axle drive shaft with friction roller, replaces the tooth bar on the raceway with the friction rib, and friction roller touches with the friction ribbed joint and forms friction, with frictional force drives raceway circulation (Fig. 2).

It is the equalizing gear of fulcrum that inner and outer sleeves is provided with the frame, with rotary freedom or the restriction rotative speed that retrains the relative frame of two sleeves; Make inner and outer sleeves do straight line advance and retreat or rotation advance and retreat.

If with the rotary freedom (Fig. 5 .1) of equalizing gear constraint sleeve, then sleeve moving linearly; If make the rotation (Fig. 5 .2) (rotative speed of equalizing gear situation except) identical with the conveyor screw rotating speed of the relative frame of equalizing gear control pinion, then sleeve is done the rotary motion that feeds.

Circulating ball is each self-forming circulating system independently on the barrel of inner sleeve, middle tube, urceolus, the ball-screw of method such as prior art.

A spirochetal end is installed in the frame with middle sleeve, and the other end encorbelments outside (or exposing) frame; The part of choosing is the range of operation of inner/outer tube; If outer sleeve is linked to each other with frame, then form with the single pattern of transporting of inner core (Fig. 7).

Between raceway and sleeve, playing a supportive role of ball replaces slip and reduces friction with rolling; For the single mechanism that transports pattern, substitute ball if roll (being annulus oblique crank Z battle array) with the axle of tube in being parallel to, also have a complete function (Figure 10), form new structural form.

Adopt axle to roll when substituting ball, roll the end at axle and establish pressure bearing and termination ring; The termination ring is located at the two ends of the round as a ball annular shaft battle array of axle, is that supporter provides axial support power to axle roller bearing battle array with the sleeve; The termination ring is made up of ring bodies and thrust baring, and bearing one end is installed on the ring of termination, and the other end is installed on the sleeve, makes the sleeve rotation relatively of termination ring; Side bearing be located at that axle rolls and termination ring between, rotate but make axle roll the opposite end headring.

If when rolling the circulating ball that substitutes between scroll bar and the middle sleeve with axle, the raceway bar can not produce axial operation because of the axial thrust that loses ball; If on the driving beaming roller, establish spiral fashion shearing ribs protrusion axial plane; Simultaneously on raceway bar (vertically), establish cut groove; Shearing ribs is injected (Fig. 9) in the cut groove, and the roll rotation makes the screw-shaped shearing ribs produce axially, circumferentially push the cut groove cell wall, and then makes the raceway bar produce axially operation and rotation.

Middle tube both can be fixedly mounted on (Fig. 1 .1) on the frame, and frame rotation does not relatively all influence the logical relation of said mechanism, but can regulate the rotative speed of the relative frame of raceway yet.Tube rotary (Fig. 1 .2) and two kinds of forms of combined rotary during the rotation of middle tube has.

Middle tube is rotary, is on middle tube, to establish engaging gear, and tube rotates in driving with governor gear, and then regulates the rotative speed of the relative frame of raceway; Middle tube is rotary, and raceway axle drive shaft (tooth) shelf position is relatively fixed.

Combined rotary (Figure 14) is established fabricate block (axle drive shaft, inside and outside middle sleeve, raceway, equalizing gear (at this moment, equalizing gear is fulcrum with the subframe)) swing pinion, newly establishes governor gear again; Make swing pinion and governor gear engaged transmission; The rotation of drive fabricate block; And then drive the raceway axle drive shaft and rotate with fabricate block, the rotation of synchronizer gear and the rotation of governor gear make the speed of driven wheel form both stack, realize adjusting the purpose of running state.

The raceway conveyor screw is the elastic helix body, after forming the internal and external screw body, still has the potential energy of recovery original-shape (radius), and the internal and external screw body forms closed ring (tractive each other).

Drive the beaming roller position if a newly-increased outer sleeve is located at, establish its frame rotation relatively; To drive roll (or driving gear) again and be located on the newly-increased outer sleeve barrel, drive the raceway bar; Newly-increased outer sleeve of rotation and roll can make the operation of raceway conveyor screw, regulate the state that feeds, and then regulate the shipping situation of inner sleeve, outer sleeve.

If middle tube termination connect a rotating cylinder can be relatively in tube rotate, the raceway transitional pore is located on this rotating cylinder, rotating cylinder is installed on the frame again, make its relatively frame rotate freely, that is middle relatively frame rotate; Newly-increased urceolus, inner core are located at rotating cylinder with end, and length makes the length of the raceway groove section on it surpass rotating cylinder greater than rotating cylinder; To increase urceolus, inner tube installation again newly on frame, frame rotation is relatively established axle drive shaft simultaneously on sleeve wall (inner core or urceolus), and rolls the ball that replaces between raceway conveyor screw and the middle tube with axle; Rotate urceolus (or inner core) and axle drive shaft, can adjust rotation of raceway conveyor screw and axial rate of feeding, and then the shipping situation of regulating (original) inner core, urceolus.

Description of drawings:

Fig. 1: this figure is the scheme drawing of cantilever mechanism, is the axial cut away view of tube in the edge.

Represent that this mechanism is by mainly being made up of middle tube, inner core, urceolus, raceway bar; Middle tube is to be provided with the tube cylindrical body that runs through circular hole, and an end is installed on the frame, and the other end is encorbelmented; Establish helix raceway groove on the middle barrel, inside and outside raceway conveyor screw runs in the guide in its raceway groove; Establish raceway between middle tube and inner core, the urceolus, establish ball between raceway and the sleeve; The power gear of driver train, synchronizer gear, axle drive shaft and end tooth wheel thereof are installed on the frame, the relative frame rotation of synchronizer gear, and drive end gear driven axle drive shaft (establishing tooth) rotation, and then drive the conveyor screw rotation; The conveyor screw rotation drives ball-recirculation and rolls, and forms the propulsive effort to urceolus, inner core.

1 represents frame; Tube in 2 representatives; 3 represent the inner core urceolus; 4 represent inner core; 5 represent the raceway bar; The raceway bar is a base shape with the square cross section, is the conveyor screw of being processed by firm matter elastomeric material, has laterally incompressible and the low characteristic of longitudinal tensile strain rate, and transverse elasticity deformability and elastic torsion ability.The outer wall of the inside and outside wall of middle sleeve, the inwall of outer sleeve, inner sleeve is provided with spiral raceway groove, and circulation raceway bar forms inside and outside two conveyor screws that are nested along rail groove operation circulation.6 represent ball; 7 represent the external tooth of synchronizer gear; 8 represent synchronizer gear and internal tooth thereof; 9 represent the end tooth wheel; The raceway of ball, ball are entrenched between raceway and the cell wall, and the slide relative between sleeve and the scroll bar is become relative rolling, reduce the relative friction between raceway and the cylindrical shell; Ball serves as to support raceway is produced radial support power, axial thrust with the raceway cell wall, keeps raceway conveyor screw shape and promotes its axial operation; On behalf of axle, 10 roll or driving gear; 10.1 representative axle drive shaft; The rotating operation of external spiral body, the ball that drives on the outer sleeve rolls, and ball promotes the outer sleeve operation.The rotation of external spiral body, internally conveyor screw forms tractive, and the inside spin body is constantly carried out the transition on the external spiral body; 11 represent bearing; 12 represent power gear.

The inside spin body raceway of rotation also in the same way the raceway bar on the tractive external spiral body get into the inside spin body, outer circulation in forming.

Fig. 1 .1: be the detail drawing in the frame zone of Fig. 1, the relative frame of tube is fixed in main the expression, and axle drive shaft is installed on the frame, and the transitional pore that raceway is walked is established in middle tube end.

1.1-1 the auxiliary frame that representative and frame are connected, axle drive shaft specifically is installed on the auxiliary frame; 13 represent transition (hole) mouth that outer circulation is walked in the raceway, tube two ends during this mouth is located at; 1.1-2 representative bearing.

If give rotative speed of frame, scroll bar and outer sleeve then just obtain a power that adds again, produce the motion stack, i.e. outer sleeve (inner sleeve) rotation feeds, the raceway conveyor screw quickens (deceleration) operation.

Fig. 1 .2: be the function expansion on the basis of Fig. 1 .1; Main expression is through the relative frame rotation of tube in making, the rotation speed of the relative frame of scalable raceway.

The driven gear during 1.2-1 representative is located on the tube, tube rotation in this gear driven; 1.2-2 the representative governor gear, it is an additionaling power independently; 1.2-3 represent the speed governing dynamical axis.

Tube gear 1.2-1 rotation during governor gear 1.2-2 drives, and then tube rotation in driving.

Fig. 2: be part sectional view (vertically), the expression scroll bar form inside and outside two the circle conveyor screws, two spirochetal spiral in the opposite direction; Axle drive shaft is located on the frame, drives spirochetal rotation, and then drives the rolling circulation of ball.

Tube can be the fabricate block of spiral bar (this figure, the not cutting of middle tube in the frame scope) during dotted line was represented; The conveyor screw that the tube cutting forms in using is the inside and outside raceway conveyor screw of correspondence respectively, produces transversal deformability.

The conveyor screw that drum outer wall forms in 15 representatives; The conveyor screw that the tube inwall forms in 16 representatives; Tube shell portion during 17 representatives are uncut.

Fig. 3: the transparent view of outgoing mechanism end is intended to explain that raceway respectively forms a conveyor screw inside and outside middle tube; Inside and outside raceway conveyor screw mutual transition in the end changes another conveyor screw over to from a conveyor screw, forms closed cycle.

In the 3-1 representative on the tube barrel set raceway pass the hole; On behalf of raceway, 3-2 carried out the transition to the middle transition section of external spiral body by the inside spin body; 5.1 represent the inner ring conveyor screw; 5.2 represent the outer ring conveyor screw; 6.4,6.3 represent the inside spin inside and outside respectively ball; 6.1,6.2 represent the external spiral inside and outside respectively ball.

Fig. 4: the cantilever conveyer of inner/outer tube has been omitted in expression.

The cylindrical space that on behalf of the inside spin body, 4-1 form.Transport the method principle based on above-mentioned cantilevered; If be nested inside and outside two cantilevered conveyers (inner core of the urceolus of the mechanism inside being enclosed in and the mechanism of outside forms disjunctor); Within the then interior mechanism outside tube and the outer mechanism tube can realize with advancing with moving back the composite structure that formation inner core (interior mechanism) and urceolus (outer mechanism) transport in the same way.

Fig. 5: the signal of expression axle drive shaft (tooth) engagement rolling bar tooth bar, the expression driving gear applies peripheral force to scroll bar, and raceway is come out by inner ring conveyor screw tractive, forms the outer ring conveyor screw.

5-1 represents the inside spin body; 5-2 represents the external spiral body.

Fig. 6: the relation between expression conveyor screw and the axle drive shaft.

The 6-1 representative is located at the ball grooves of raceway bar spiral coil outside; The 6-2 representative is located at the ball grooves of spiral coil inner face.

Fig. 7: expression outer sleeve and frame are connected, and form the pattern of only transporting with inner sleeve.The external spiral body forms closed ring (tractive each other), therefore, when its inside of cancellation or external bracing, still can be adjacent to middle tube, so the length of inner/outer tube both can also can be omitted and not establish less than middle tube length degree; Behind cancellation inner core or the urceolus, the raceway conveyor screw is still had carrying capacity, forms rotation and transports.

Fig. 8: the section drawing of expression scroll bar and with the relation of raceway groove.The raceway groove is located on the sleeve (inner core, urceolus, middle tube), and scroll bar is embedded in the raceway groove and moves; The raceway groove is the guide groove of raceway bar, shape in the shape of a spiral; Raceway groove groove top and two side are provided with the ball-recirculation road of half opening, and it is corresponding with ball grooves on the scroll bar, formation ball rolling on-cycle passage; The circulation road of half opening is connected with the circulation port on the sleeve, forms the closed cycle passage.

8-1 represents cylindrical shell; 8-2 represents the ball-recirculation road on the raceway groove end face, and it is corresponding with ball-recirculation road on the scroll bar, forms circular ball hole; The 8-3 representative is located at the tooth bar on the scroll bar; (axle drive shaft and middle tube laterally arrange for it and axle drive shaft; Some axle drive shaft is the center rectangular distribution with the middle sleeve axial line, forms annulus oblique crank Z battle array, with the extruding of axle battle array, friction (referring to adopt friction driving way) raceway; Make the external spiral body both guaranteed round-shaped constant with press close to middle tube, produce axially rotation again.

The raceway bar carries out the transition to the outer ring by inner ring, and its hand of rotation is constant, and the direction of spiraling becomes oppositely (advance for one, advance for one) left to the right, forms excessively section; The relative sleeve in cross section of this section raceway bar twists, and is turned back on the external spiral body by the inside spin body; Simultaneously, radius of rotation has little the change gradually to increase curature variation.Transition phase does not produce substantial effect to the delivery functions of mechanism, through regulating the course length of transition phase, eliminates flexible that the raceway bar produces in operation process.) on driving gear engagement; 8-4 represents the ball-recirculation road on the raceway groove sidewall; 8-5 represents the ball grooves (being the ball-recirculation road) on the raceway; 8-6 represents the crush rib on the raceway, and it contacts with axle drive shaft (or being located at the friction roller on the axle drive shaft), transmits diametral load, and raceway is pressed to sleeve.

Fig. 9: expression scroll bar cross sectional shape, and the lid pig's tongue on it is set.Ball road is not established on this scroll bar top, is applicable to outer part is rolled alternative ball with axle the mechanism that chooses; The lid pig's tongue can be located at top and also can be located at the bottom, gets into the gap between two spiral coils in order to intercept outside fines.

Simultaneously, this figure representes that also the scroll bar end face establishes the shearing groove, establishes shearing ribs (lift angle is identical with the conveyor screw lift angle) on the axle drive shaft, and shearing ribs axially promotes the scroll bar motion during rotation.

9-1 represents tooth bar; Pig's tongue is covered in the 9-2 representative; 9-3 represents ball road; 9-4 represents axle drive shaft; 9-5 represents shearing ribs, and cooresponding with it is cut groove.

Figure 10: be the extension of Fig. 9 scheme, expression is rolled alternative ball with axle.

On behalf of axle, 10-1 roll; 10-2 represents thrust collar, and axle is rolled the axial support power that provides; The 10-3 representative

Figure 11: be replenishing of Figure 10 scheme, the end structure that the expression axle rolls, and axle rolls, the relation between the side bearing, thrust collar, outer sleeve.

11-1 represents the inner ring of thrust baring; Thrust baring is the side bearing that axle rolls, and it relies on thrust collar that axle is rolled axial thrust is provided; On behalf of axle, 11-2 roll; On behalf of axle, 11-3 roll installation shaft; 11-4 represents the outer ring of thrust baring; 11-5 represents thrust collar, and it is the ring bodies of support side bearing, and the ring-type thrust baring through the end is connected with frame, and frame rotation relatively reduces the circumferential resistance of conveyor screw; 11-6,8 represents two ring plates of ring-type thrust baring; 11-7 represents ball.

Figure 12: the relation of expression scroll bar, ball, driving gear.Annular scroll bar is tangent on expression driving gear and the conveyor screw, through the engaging tooth power transmission.Middle tube ball grooves and raceway bar ball grooves form the ball hole of circulating ball.If middle barrel is cut along the centre, be divided into inside and outside two son tubes that are nested; My husband's tube of choosing is outward made and the identical conveyor screw (Fig. 2) of outer raceway bar conveyor screw lift angle, and interior son tube is made and the identical conveyor screw of interior raceway bar conveyor screw lift angle, and then outer choosing partly is made up of four conveyor screws; Ball operates in respectively in the ball hole of two son tube conveyor screws and the formation of raceway conveyor screw, can make the outer part of choosing form crooked deformability.

12-1 represents ball, and it is corresponding to the extruding of the support of scroll bar and axle drive shaft; 12-2 represents the ball grooves of scroll bar side, and it is corresponding with ball grooves on the sleeve raceway groove; 12-3 represents the raceway bar.

Figure 13: be along sleeve part sectional view radially; Expression can drive at inside spin body, external spiral body simultaneously, axle drive shaft 10 (left side is that friction roller drives, and the right side is that driving gear drives).

Figure 14: compound type rotation adjusting feed status is adopted in expression.Still keep on the basis to axle drive shaft at original power gear, synchronizer gear, inner core, urceolus, middle tube, raceway, axle drive shaft are formed a fabricate block, frame rotation relatively; Drive through governor gear, middle tube and raceway conveyor screw on the fabricate block rotate; The spirochetal rotative speed of raceway is the stack result that synchronizer gear drives and governor gear drives.

14-1 represents subframe, is the skeleton of fabricate block; The 14-2 representative is located at the driven gear on the subframe; 14-3 represents the input port of governor gear.

The specific embodiment:

With Fig. 1 is embodiment; Concrete scheme is: inner core, middle tube, three of urceolus are nested; Middle tube inside and outside wall, inner tank theca, outer tube inner wall are established the raceway circulation groove; Middle tube is connected with frame, and each self-forming independent loops system of circulating ball (raceway bottom land, two side) is established friction roller and the tangent driving of external spiral body on the axle drive shaft.

1, makes inner core, middle tube, urceolus; Three are nested, and stay certain interval between adjacent two; The groove-section height deducts the difference of two ball radiuses, is the residual thickness of groove-section, and the gap between two gets final product less than residual thickness.

2, make the raceway conveyor screw; The spiral coil diameter adds a wall thickness with middle tube internal diameter and is as the criterion, and as spirochetal diameter projected, is beneficial to middle tube.

3, inner core, urceolus are all shorter, and the length of inner core, urceolus and middle tube length degree poor is exactly that linearity is transported distance.

4, press parameters such as raceway conveyor screw internal diameter, external diameter, lift angle, earlier in middle tube, mill out the raceway groove on (or outside) wall; According to transition phase track and the intersection point of plug helix on sleeve end face drafted, confirm spiral fluted starting point on the outer wall then, mill out the outer wall plug helix then; Transition phase track by drafting is got through the internal and external screw body, forms the raceway hole

5, in type raceway groove bottom land, sidewall processing ball rolling circulation groove and circulation port; The specific practice of circulation port is with the ball-screw of prior art.

6, make the raceway axle.

7, make synchronizer gear; Synchronizer gear internal diameter and ring raceway axle axle battle array annulus external diameter equate.

8, make frame, each parts is installed.

9, connect power, commissioning test.

Claims (2)

1. a cantilevered is transported method, adopts the many raceways that socket-connect, circulate to twine the operation of sleeve cycle mode, and drive sleeve transmits the thing of encorbelmenting; It is characterized in that: mainly form by critical components such as outer sleeve, middle sleeve, inner sleeve, raceway, raceway axle drive shaft, ball-recirculation marshalling, synchronizer gear, power gear; The raceway bar spirals and is wrapped on the inner and outer wall of middle sleeve, forms two conveyor screws that are nested; The raceway bar carries out the transition to the raceway groove on the outer wall by the circulation of the helix raceway groove on the middle sleeve inwall, on outer wall, forms the external spiral body, is recycled to inwall through transitional pore by outer wall again, forms closed cycle; Outer sleeve is socketed in outside the outer spiro body, and inner sleeve is socketed in the inner spiro body; Establish circulating ball between scroll bar and the sleeve; Ball forms independent loops system separately on inner sleeve, middle tube, urceolus; Raceway conveyor screw rotating operation drives ball and rolls, and then drives the mobile and axial rotation of inside and outside tube by ball; With the frame is fulcrum, on inside and outside sleeve, establishes equalizing gear, the slew mode of constraint or adjusting inner/outer tube, and formation is axially transported and rotation feeds; Spirochetal rotation can be by friction roller or driving gear transmission; Axle drive shaft is located at an end of outer spiro body, and remainder is chosen outside the frame, is the region of operation of inner and outer sleeves; Axle drive shaft and middle tube laterally arrange, and some the axis of rolling are the center rectangular distribution with the middle sleeve axle center, form annulus oblique crank Z battle array, and extruding, friction, engagement drive conveyor screw, have both guaranteed the round-shaped constant of bung flange, drive the conveyor screw rotation again; Synchronizer gear, power gear, middle tube are installed on the frame, and axle drive shaft is installed between frame and the outer spiro body; The end tooth wheel engaged transmission of synchronizer gear and each axle drive shaft drives each axle drive shaft rotation; The circulation groove-section is square basal plane, and ball grooves is established at the four sides, is provided with tooth bar (or friction face) and crush rib on the end face in addition; Driving gear on the axle drive shaft and tooth bar engagement power transmission; On the middle tube raceway hole, end, establish the flexible compensation structure of raceway.

2. cantilevered as claimed in claim 1 is transported method, it is characterized in that: change or increase and decrease after certain member, still can form the effective conveyer based on the raceway circulative metabolism.

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