CN2721309Y - Central transmission mechanism of milling machine working table - Google Patents

Abstract

The utility model relates to a central transmission mechanism for a milling machine table, having high work efficiency and convenient use and comprising a machine frame, a longitudinal transmission mechanism, a transversal transmission mechanism and a lifting mechanism, wherein, the longitudinal transmission mechanism comprises a table, a table seat, a longitudinal screw rod, a longitudinal screw nut, a longitudinal hand wheel, a longitudinal power transmission mechanism and a reversing mechanism. The transversal transmission mechanism comprises a middle sliding seat, a transversal screw rod, a transversal screw nut, a transversal hand wheel and a transversal power transmission mechanism. The longitudinal power transmission mechanism comprises an output gear, an intermediate wheel, a two-gear, a splined shaft, a transmission gear, a power gear and a power sliding sleeve whose outer surface is provided with a groove. The reversing mechanism is composed of a one-gear, a handle, a rotating shaft, a rocking arm and a shifting block which is positioned in the groove of the power sliding sleeve. The transversal power transmission mechanism comprises a screw rod bevel gear, a power bevel gear, a transmission bevel gear and a transversal bevel gear.

Description

Milling machine table central driving mechanism

Technical field

The utility model relates to milling machine table, relates in particular to milling machine table central driving mechanism.

Background technology

Common milling machine table can be realized vertically moving and laterally move.Milling machine table central driving mechanism comprising frame, vertically transmission mechanism, laterally transmission mechanism, move up and down the elevating mechanism that is connected with frame; Vertical transmission mechanism is comprising workbench, the table rest that is connected with stationary table, vertical gearbox, vertical leading screw, the longitudinal axis that is parallel to vertical leading screw, output gear, idle wheel, vertical screw, vertical handwheel; Laterally transmission mechanism is comprising lateral velocity variation case, horizontal hair thick stick, middle slide, clutch, clutch-middle slide operating mechanism, horizontal screw, horizontal handwheel, lateral dynamics transmission mechanism; Elevating mechanism is comprising the lifting triangle body; Connection also horizontally slips with it on the slide during table rest is installed in; Vertical leading screw is installed on the table rest and is rotatably connected relatively with it; Have first gear, second gear on the vertical leading screw; Longitudinal axis, output gear, idle wheel are installed in respectively on the middle slide, output gear and idle wheel are meshing with each other, and have travelling gear, power gear on the longitudinal axis, and idle wheel is meshed with travelling gear, power gear is meshed with second gear, and power gear is corresponding with first gear; Idle wheel and travelling gear are meshing with each other; Vertically screw is fixedlyed connected with middle slide; Clutch is installed on the longitudinal axis, and clutch-middle slide operating mechanism is installed on the middle slide; Be slidingly connected before and after middle slide and the lifting triangle body; Power reaches on the longitudinal axis that is parallel on the vertical leading screw by motor through gearbox when workbench vertically moves; The longitudinal axis upper transfer gear drives second gear through power gear and rotates, second gear drives vertical leading screw and rotates, vertical leading screw drives table rest left and right sides straight line through vertical screw and moves, this moment, workbench was in motoring condition, be that vertical handwheel at workbench two ends and vertical leading screw break away from and be in transmission connection, promptly vertical leading screw rotates and vertically handwheel is motionless; Hand moving vertical handwheel, vertically the vertical leading screw of handwheel drive rotates, and vertical leading screw drives table rest left and right sides straight line through vertical screw and moves, and this moment, workbench was in manual state, and promptly vertical handwheel at workbench two ends is connected with vertical lead screw transmission; The lateral dynamics transmission mechanism comprising be installed in the leading screw bevel gear on the vertical leading screw, the power bevel gear that is meshed with the leading screw bevel gear, with the drive bevel gear of the coaxial running of power bevel gear, the horizontal bevel gear that is meshed with drive bevel gear; Power bevel gear and transmission awl tooth are installed in respectively on the middle slide; Laterally bevel gear is installed on the horizontal hair thick stick; The horizontal hair thick stick is installed on the lifting triangle body; Laterally screw is installed on the middle slide; The power bevel gear is fixedlyed connected by sliding sleeve with first gear, and vertical leading screw passes this sliding sleeve and flexibly connects with it; When the needs workbench laterally moves forward and backward, by clutch, clutch-middle slide operating mechanism power gear is meshed with first gear, power gear drives first gear and rotates, first gear drives the power bevel gear through sliding sleeve and rotates, this moment, vertical leading screw was motionless, the power bevel gear is through drive bevel gear, laterally bevel gear drive horizontal hair thick stick rotation, and horizontal hair thick stick slide in the transverse wire master tape is moving is made laterally front and back rectilinear motion along the lifting triangle body; This moment, workbench was in motoring condition, and promptly the horizontal handwheel of horizontal hair thick stick front end and horizontal hair thick stick break away from and to be in transmission connection, and promptly the horizontal hair thick stick rotates and horizontal handwheel is motionless; Hand moving horizontal handwheel, laterally handwheel drives the horizontal hair thick stick and rotates, the horizontal hair thick stick in the transverse wire master tape is moving slide laterally before and after straight line move, workbench is in manual state at this moment, promptly the horizontal handwheel of horizontal hair thick stick front end and horizontal hair thick stick are in transmission connection; Milling machine is worked as this kind of use milling machine table transmission device, electronic change manual operation, or manually power transformation is moved when operating, troublesome poeration; This kind milling machine table transmission structures complexity, use trouble, inefficiency, production cost height.

Summary of the invention

The purpose of this utility model provides a kind of high efficiency, milling machine table central driving mechanism easy to use.

For achieving the above object, the technical solution adopted in the utility model is: a kind of milling machine table central driving mechanism, comprising frame, vertically transmission mechanism, laterally transmission mechanism, elevating mechanism; Vertically transmission mechanism is comprising workbench, table rest, longitudinal leadscrew, vertical screw, vertical handwheel, vertical power drive mechanism, changement; Laterally transmission mechanism is comprising middle slide, horizontal leading screw, horizontal screw, horizontal handwheel, lateral dynamics transmission mechanism; Elevating mechanism is comprising the lifting triangle body; Vertically power drive mechanism comprising output gear, idle wheel, second gear, splined shaft, be installed in travelling gear and power gear on the splined shaft; Changement is comprising the first gear that is installed on the longitudinal leadscrew; During being installed in, first gear also is rotatably connected mutually with it on the slide; Middle slide is installed on the lifting triangle body, and on the slide, laterally screw was fixedlyed connected with middle slide during table rest was installed in, and laterally leading screw is installed on the lifting triangle body; Its characteristics are: vertically power drive mechanism comprises that also outer surface has the power sliding sleeve of a border groove; Power gear, power sliding sleeve are fixedly connected, and splined shaft passes the power sliding sleeve, and splined shaft can horizontally slip with the power sliding sleeve and be connected; Changement wherein also comprises handle, rotating shaft, rocking arm, shifting block; Rotating shaft is relative with middle slide to be rotatably connected, and fixedlys connected with handle one end in the rotating shaft outer end, and rotating shaft is inner fixedlys connected with rocking arm one end, and the rocking arm other end is fixedlyed connected with shifting block, and shifting block is corresponding with the groove of power sliding sleeve and be positioned at the groove of power sliding sleeve; The lateral dynamics transmission mechanism comprising the leading screw bevel gear that is installed on the longitudinal leadscrew and flexibly connect with longitudinal leadscrew, the power bevel gear that is meshed with the leading screw bevel gear, with the drive bevel gear of the coaxial running of power bevel gear, the horizontal bevel gear that is meshed with drive bevel gear; The power bevel gear is installed on the middle slide respectively and relative with it being rotatably connected with drive bevel gear; First gear is fixedlyed connected with the leading screw bevel gear, and laterally bevel gear is installed on the horizontal leading screw and the relative connection that horizontally slips with it.

The utility model is simple in structure, be convenient to assembling and maintenance, greatly reduces manufacturing cost, improves efficiency of assembling.

Description of drawings

Fig. 1 is a kind of structural representation of the present utility model;

Fig. 2 is the right view of Fig. 1;

Fig. 3 is the A-A cutaway view among Fig. 2;

Fig. 4 is for removing the vertical view of workbench, table rest among Fig. 3;

Fig. 5 is a B-B cutaway view among Fig. 4;

Fig. 6 is that D-D launches view among Fig. 5;

Fig. 7 is a C-C cutaway view among Fig. 1;

Fig. 8 is a longitudinal leadscrew right-hand member partial enlarged drawing among Fig. 3.

The specific embodiment

Embodiment 1

One kinds of milling machine table, driving the mechanism shown in Figure 1, Figure 2, which comprises a frame 9, vertical The transmission mechanism, horizontal transmission, common lifting mechanism 8; Figure 3 and Figure 4, the vertical drive Mechanism including the common table 5, and the table 5 is fixed to the table base 10 connected through the workbench Vertical screw 11 of seat 10, and vertical screw 11 threaded nut 12 connected to the longitudinal, vertical screw 11 two With the longitudinal ends of the jaw clutch 13, the left and right vertical hand wheel 4,6, longitudinal motive power transmission Agencies, reversing mechanism; shown in Figure 6,7, horizontal transmission mechanism, including in slide 3, through the slippery Block 3 transverse screw 15, and horizontal transverse screw 15 threaded connection nut 14, transverse screw 15 before End with a transverse jaw clutch 17, horizontal hand wheel 7, the lateral power transmission mechanism; lifting mechanism 8 Including the use of common methods and frame 9 can be connected to the lifting up and down movements relative triangular body 16; longitudinal wire Bars 11 and 10, Block table relative rotation connected by conventional means; in slide three common methods used mounted on l Upper and lower triangular body 16 relative to slide back and forth with their connections, bench seat 10 mounted in a conventional manner in the slip Block 3 and its corresponding sliding around on the connection; vertical screw 11 through the respective longitudinal ends of jaw clutch 13, shown in Figure 8, the longitudinal jaw clutch 13 which includes a pair of mutually corresponding longitudinal screw The clutch sleeve 18, the vertical hand wheel 20 and the vertical shaft clutch return spring 19, the vertical screw clutch Sleeve 18 and the vertical screw 11 is fixedly connected with the common method, the vertical hand wheel clutch sleeve 20 with the longitudinal Handwheel 6 is fixedly connected with the common method, the vertical screw 11 passes through the vertical hand wheel 6, respectively, the vertical reset shells Spring 19, the vertical screw clutch sleeve 18 and vertical hand wheel clutch sleeve 20; vertical screw 11, respectively, With the longitudinal and vertical handwheel handwheel clutch 6 bushings 20 active connections, both relative rotation, but also about Relative sliding; longitudinal vertical screw return spring 19 is located in the clutch sleeve 18 with the longitudinal axis of the hand wheel clutch Between housing 20; vertical longitudinal one end of the return spring 19 screw clutch sleeve 18, the other end of the longitudinal Handwheel clutch sleeve 20; vertical screw clutch sleeve 18 and the longitudinal handwheel clutch sleeve 20 relative On the surface of each ring with projections and recesses, vertical screw clutch sleeve 18 points on the projections and recesses Do not hand wheel and vertical clutch sleeve 20 on the corresponding recesses and projections; when using the vertical jaw clutch Controller, hand push the longitudinal vertical handwheel screw clutch sleeve and handwheel clutch sleeve longitudinal engagement, namely Vertical screw clutch sleeve projection embedding handwheel clutch sleeve longitudinal groove, while vertical hand Round projection on the clutch sleeve screw embedded longitudinal groove on the clutch sleeve; longitudinal nut 12 and The slide 3 is fixedly connected with the common methods; vertical longitudinal handwheel handwheel drive clutch sleeve rotation, vertical Handwheel clutch clutch hub sleeve rotating screw driven vertical longitudinal and vertical wire screw clutch sleeve Vertical bars are connected to drive the screw rotation, so that longitudinal movement of table; when not required by the hand when the longitudinal Return spring clutch sleeve and screw the vertical longitudinal handwheel disengage the clutch sleeve; Because vertical screw points Do the longitudinal and vertical handwheel handwheel clutch sleeve active connection, then screw rotation and longitudinal vertical handwheel Fixed; longitudinal vertical handwheel hand wheel and the clutch sleeve can also be made into one; shown in Figure 6, the longitudinal moving Force transmission mechanism including common output gear 21, the common medium round 22, the common drive gear 23, the common Spline shaft 24, the outer surface of the driving force with one weeks sleeve ring groove 25, the power gear 26, mounted in the longitudinal direction And power screw 11 and the gear 26 corresponds to two-speed gear 27; output gear 21 and the wheel 22 relative dielectric Intermeshing, dielectric wheel 22 and drive gear 23 meshing with each other; output gear 21, dielectric common side wheels 22 are used France mounted in slide 3; splined shaft 24 through gears 26 power, power sliding sleeve 25, the drive gear 23, the power gear 26, the power sleeve 25, the drive gear 23 is fixedly connected with the common methods and the spline shaft 24 in coaxial operation, the power sleeve 25 with the spline shaft 24 is slidably connected to opposite left and right, so the power gear 26 is a sliding gear, spline shaft 24 mounted in a conventional manner in slide 3, the splined shaft 24 and the Slide relative rotation three common methods used to connect; vertical screw 11 passes through the two-speed gear 27, two-speed gear 27 By using common methods sliding key 11 with the longitudinal sliding around screw connection; shown in Figure 4,5,6, commutation Institutions including the handle 2, the shaft 28, the rocker arm 29, shifting block 30, activity screw 11 mounted on the longitudinal And with the power gear 26 corresponds to a speed gear 31; shaft 28 in a conventional manner with the slide 3 Relative Rotatably connected to the outer end of the shaft 28 is fixedly connected at one end to the handle 2, the inner end 28 of the rocker arm shaft 29 at one end Fixed connection, the other end of the rocker arm 29 is fixedly connected with the setting block 30, block 30 and power dial sleeve 25 recess Corresponding power sleeve 25 and is located within the grooves; vertical screw 11 in a conventional manner through the first gear 31, first gear 31 mounted on the common methods used in slide 3 and phase rotation therewith connected; turning the handle Drive shaft rotation, so that rotation of the handle causes the sleeve grooves located within the power toggle power allocated block slide in Splined shaft sliding around, while the power gear is fixed together with the power sliding around the sleeve, so that the action Force when sliding the left gear meshing with a gear, slide to the right when the gear meshing with the two in one, two The middle-speed gear position is neutral, so there are three power gear gear; shown in Figure 1,6, workers For stage movement, by the power box an input torque from the output gear 21, a referral to the drive gear wheel 22 23, the torque transmitted to the drive gear 23 splined to shaft 24, and then mounted on the spline shaft power Sleeve 25, the power transmission gear 26 power; when the power gear slide to the right and two-speed gear is engaged, through Over two-speed gear driven vertical screw rotation, so that the rotation of the lead screw driven longitudinally along the sliding bench seat Block longitudinal movement; when needed by the commutation circuit controls the power box with a motor which direction to turn to achieve Change, so that the longitudinal automatic feed and commutation can be achieved; When you need to manually move and commutation, rotate the hand Handle, the power gear and two-speed gear disengaged, the gear is a dynamic, two block between the neutral position, Promote the ends of the longitudinal bench seat handwheel, the screw shaft and the clutch sleeve handwheel clutch engagement, spin Longitudinal turn hand wheel, thus boosting vertical screw rotation, the longitudinal screw driven table and move around; Figure 3,7 shows, including lateral force transmission mechanism mounted on the longitudinal and vertical screw 11 and the screw 11 Active connection screw bevel gear 32, bevel gear 32, the screw engaging force bevel gear 33, and power Bevel drive gear 33 coaxially running bevel gear 34, and the drive bevel gear 34 meshed lateral bevel gear 35; screw bevel gear 32 having a common longitudinal screw sleeve 36, the vertical screw 11 through the screw cone Gear 32, the vertical screw sleeve 36 and with the active connection; first gear 31 with the screw bevel gear 32, Vertical screw sleeve 36 is fixedly connected with the common methods and coaxial operation, screw bevel gear bevel gear 32 and the power Round 33 is a bevel gear, bevel gear 34 and the drive bevel gear 35 is a horizontal bevel gear; dynamic cone Bevel gear 33 and drive gear 34 mounted on the common methods used in slide 3 and with the relative rotation of the connection; Lateral nut 14 and the carriage 3 is fixedly connected with the common method, horizontal screw 15 passes through the horizontal bevel gear 35, the lateral sliding bevel gear 35 via common bond with the common methods installed in horizontal screw 15 and is movable relative to its Front and rear sliding connection, horizontal bevel gear 35 mounted on the common methods used in slide 3 and movable relative thereto Rotary joint, lateral nut 14 fixedly mounted on the common methods used in slide 3, the transverse screw 15 with a constant Triangle method the lifting body 16 and connected with relative rotation; the transmission principle as follows Above: Figure 3 shows, with the left power gear when first gear engages the horizontal automatic feed; power Gear meshing with the first gear, driven gear fixed gear with a coaxial connection and operation of the rotary screw bevel gear Turn, because the longitudinal and vertical screw screw sleeve active connection, then vertical screw does not move, screw bevel gear Bevel gear meshing with power, power transmission bevel gear drive bevel gear, bevel gear transmission and horizontal bevel gear Wheel engages horizontal bevel gear driven horizontally through the sliding key screw rotation, horizontal transverse screw drive nut ago After the linear movement, the rotary motion into a linear motion; horizontal and vertical screw 15 passes through the front jaw Clutch 13 is the same transverse configuration of jaw clutch 17, lateral jaw clutch 17 including A pair of mutually corresponding transverse screw clutch sleeve, lateral and horizontal hand wheel clutch return spring sleeve, Horizontal screw 15 through the horizontal return spring, transverse screw shaft clutch, clutch shaft transverse handwheel Sets, horizontal hand wheel 7, the clutch sleeve and the transverse horizontal screw the screw 15 is fixedly connected by conventional methods, Lateral hand wheel clutch sleeve and lateral hand wheel 7 is fixedly connected with the common methods, lateral and horizontal hand handwheel 7 Wheel clutch sleeve with transverse screw 15 activities were connected, they can rotate relative, but also before and after the phase On the slide; horizontal return spring in the lateral and transverse screw clutch sleeve between the hand wheel clutch sleeve, The return spring one end of the transverse horizontal screw clutch sleeve, the other end of the clutch sleeve horizontal hand wheel; horizontal Transverse to the screw clutch sleeve and handwheel clutch sleeve relative to the ring plane, respectively, with a projection and a recess Slots, horizontal screw clutch sleeve projections and recesses, respectively handwheel clutch sleeve and transverse grooves on And the corresponding projections; when using lateral jaw clutch 17, the hand pushing the lateral transverse screw handwheel Clutch sleeve and handwheel clutch sleeve lateral engagement, ie transverse screw clutch sleeve projection embedding Lateral hand wheel clutch sleeve groove, while the horizontal hand wheel clutch sleeve projection embedding transverse wire Bumper clutch sleeve groove; rotating horizontal hand wheel, hand wheel drive transverse horizontal hand wheel clutch sleeve Turning, horizontal hand wheel drive transverse screw clutch clutch hub sleeve rotation, horizontal screw clutch shaft The screw cap is connected to the transverse horizontal screw rotating drive, so that the lateral slide movement; when no hand When, by the lateral transverse screw clutch return spring sleeve and lateral hand wheel disengaged clutch sleeve by The transverse and horizontal handwheel handwheel clutch sleeve respectively transverse screw active connection, then transverse screw rotation Turn hand wheel does not move laterally; horizontal and transverse handwheel handwheel clutch sleeve can also be made into one. ...

Claims (3)

1, a kind of milling machine table central driving mechanism is comprising frame (9), vertically transmission mechanism, laterally transmission mechanism, elevating mechanism (8); Vertically transmission mechanism is comprising workbench (5), table rest (10), longitudinal leadscrew (11), vertical screw (12), vertical handwheel (4,6), vertical power drive mechanism, changement; Laterally transmission mechanism is comprising middle slide (3), horizontal leading screw (15), horizontal screw (14), horizontal handwheel (7), lateral dynamics transmission mechanism; Elevating mechanism (8) is comprising lifting triangle body (16); Vertically power drive mechanism comprising output gear (21), idle wheel (22), second gear (27), splined shaft (24), be installed in travelling gear (23) and power gear (26) on the splined shaft (24); Changement is comprising the first gear (31) that is installed on the longitudinal leadscrew (11); First gear (31) is installed in middle slide (3) and upward also is rotatably connected mutually with it; Middle slide (3) is installed on the lifting triangle body (16), and table rest (10) is installed on the middle slide (3), and laterally screw (14) is fixedlyed connected with middle slide (3), and laterally leading screw (15) is installed on the lifting triangle body (16); It is characterized in that: vertically power drive mechanism comprises that also outer surface has the power sliding sleeve (25) of a border groove; Power gear (26), power sliding sleeve (25) are fixedly connected, and splined shaft (24) passes power sliding sleeve (25), and splined shaft (24) can horizontally slip with power sliding sleeve (25) and be connected; Changement wherein also comprises handle (2), rotating shaft (28), rocking arm (29), shifting block (30); Rotating shaft (28) and relative being rotatably connected of middle slide (3), fixedly connected with handle (2) one ends in rotating shaft (28) outer end, rotating shaft (28) is inner fixedlys connected with rocking arm (29) one ends; rocking arm (29) other end is fixedlyed connected with shifting block (30), and shifting block (30) is corresponding with the groove of power sliding sleeve (25) and be positioned at the groove of power sliding sleeve (25); The lateral dynamics transmission mechanism comprising the leading screw bevel gear (32) that is installed in that longitudinal leadscrew (11) is gone up and flexibly connect with longitudinal leadscrew (11), the power bevel gear (33) that is meshed with leading screw bevel gear (32), with the drive bevel gear (34) of the coaxial running of power bevel gear (33), the horizontal bevel gear (35) that is meshed with drive bevel gear (34); Power bevel gear (33) is installed in middle slide (3) respectively with drive bevel gear (34) and goes up and relative with it being rotatably connected; First gear (31) is fixedlyed connected with leading screw bevel gear (32), and horizontal bevel gear (35) is installed in horizontal leading screw (15) and goes up and the relative connection that horizontally slips with it.

2, milling machine table central driving according to claim 1 mechanism, it is characterized in that: described vertical transmission mechanism also comprises vertical jaw clutch (13) that described longitudinal leadscrew (11) two ends have respectively; Vertically jaw clutch (13) is comprising the longitudinal leadscrew clutch bushing (18) of vertical back-moving spring (19) and a pair of mutual correspondence, vertical handwheel clutch bushing (20), and longitudinal leadscrew (11) passes vertical back-moving spring (19), longitudinal leadscrew clutch bushing (18), vertical handwheel clutch bushing (20); Longitudinal leadscrew clutch bushing (18) is fixedlyed connected with longitudinal leadscrew (11), vertically handwheel clutch bushing (20) is fixedlyed connected with described vertical handwheel (4,6), vertically handwheel (4,6) and vertical handwheel clutch bushing (20) not only can rotate relatively with longitudinal leadscrew (11) respectively, but also can about slip relatively; Vertically back-moving spring (19) is positioned between longitudinal leadscrew clutch bushing (18) and the vertical handwheel clutch bushing (20), vertically back-moving spring (19) one termination longitudinal leadscrew clutch bushings (18), the vertical handwheel clutch bushing of another termination (20); Have projection and groove respectively on the relative anchor ring of longitudinal leadscrew clutch bushing (18) and vertical handwheel clutch bushing (20), the projection on the longitudinal leadscrew clutch bushing (18) is corresponding with groove and projection on vertical handwheel clutch bushing (20) respectively with groove.

3, milling machine table central driving according to claim 1 and 2 mechanism, it is characterized in that: described horizontal transmission mechanism also comprises the horizontal jaw clutch (17) that described horizontal leading screw (15) front end has; Laterally jaw clutch (17) is comprising the horizontal leading screw clutch bushing of a pair of mutual correspondence, horizontal handwheel clutch bushing and horizontal back-moving spring, laterally leading screw (15) front end passes horizontal leading screw clutch bushing, horizontal handwheel clutch bushing and horizontal back-moving spring respectively, laterally the leading screw clutch bushing is fixedlyed connected with horizontal leading screw (15), laterally the handwheel clutch bushing is fixedlyed connected with described horizontal handwheel (7), laterally handwheel (7) and horizontal handwheel clutch bushing not only can rotate relatively with horizontal leading screw (15) respectively, but also can about slip relatively; Laterally back-moving spring at horizontal leading screw clutch bushing with laterally between the handwheel clutch bushing, the horizontal horizontal leading screw clutch bushing of back-moving spring one termination, the horizontal handwheel clutch bushing of another termination; Laterally have projection and groove respectively on the relative anchor ring of leading screw clutch bushing and horizontal handwheel clutch bushing, laterally the groove that puts with horizontal handwheel clutch shaft respectively of the projection on the leading screw clutch bushing and groove and protruding corresponding.

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