CN201841430U - Double-lead worm gear gap eliminating device for swaying structure - Google Patents

Abstract

Disclosed is a double-lead worm gear gap eliminating device for a swaying structure. A servo motor, a worm gear and a worm are mounted in a frame. The double-lead worm gear gap eliminating device is characterized in that a swaying part is integrally fixed with the worm gear and is driven to sway by the double-lead worm, a fixed end and a floating end of the double-lead worm are supported by respective ball bearings and rotate, thrust ball bearings are further arranged at two ends of the ball bearing of the fixed end so as to realize axial thrust stopping of the fixed end, axial and radial gap elimination of a driving mechanism is realized via an adjusting gasket, and sealing rings are all mounted on two end caps of the double-lead worm, a supporting sleeve, the upper and lower surfaces of the worm gear and edges of a framework sealing part, thereby forming a closed cavity. Swaying torque of a processed swaying shaft is 4000N.m, transmission ratio of a selected motor and the worm gear is 120:1, the adjustment distance for the axial gap elimination is 5mm, and after the double-lead worm gear gap eliminating device is assembled, difference between the adjustment distance for adjusting the axial gap elimination and a designed parameter is within a range of 0.15mm. The double-lead worm gear gap eliminating device has the advantages of 1, application of the double-lead worm gear in the swaying structure, 2, gap adjustment technology of the double-lead worm gear, and 3, temperature restraining technology of the double-lead worm gear.

Description

The two helical pitch gap eliminator for worm and wormwheel that are used for yaw

Technical field

The utility model relates to machining equipment, and this backlash eliminating equipment is applicable to the disappear crack and the driving of various oscillating head mechanisms.

Technical background

In recent years, with the healthy high speed development of national economic development, the China NC Machine technology has obtained fast development and rapid progress, but compares quite big gap in addition with international most advanced level.At home in the Digit Control Machine Tool market, domestic enterprise's possession share is less, low-grade Digit Control Machine Tool product scopes such as that product mainly concentrates on is economical, plain edition, and the market share of high-grade, digitally controlled machine tools, particularly five-coordinate linkage, large-size numerical control machine is captured by foreign brand name.The present situation of machine tool industry causes China's aerospace component numerical control machining equipment for a long time based on import equipment, equips near 100% dependence on import with the contour key problem in technology of five machining centers of band AB axle yaw structure especially.Because must be during this kind equipment buying to the licensing of device fabrication state, the property obtained of equipment is subjected to the International Politics factor affecting very big, often occur that the buying of crucial visual plant is incured loss through delay or buying less than and have influence on the finishing of research and production task of aircraft manufacturing enterprise.

The drives structure of the current yaw of using always has: gear-wheel gear-ring formula, telescopic branched chain formula and two sections Worm-gear types.And these three kinds of structures commonly used some fatal shortcoming all: positioning accuracy is poor; Complex structure, the system requirements height; It is big that sideshake is adjusted difficult and worm screw generates heat etc.

Summary of the invention

This novel purpose provides two helical pitch gap eliminator for worm and wormwheel that a cover is used for yaw, be applicable to the disappear crack and the driving of various oscillating head mechanisms, can satisfy the balance staff of yaw swings fast, moment of torsion is big, the requirement that rigidity is strong, the high speed five machining center yaws that solved the band yaw bottleneck problem in crack that disappears.

The two helical pitch gap eliminator for worm and wormwheel that are used for yaw, be applicable to the disappear crack and the driving of various oscillating head mechanisms, it is characterized in that adopting two helical pitch worm structures, servomotor is fixed on the framework, worm and gear is installed in the framework, swing component and worm gear are fixed as one and realize swing under the drivings of two helical pitch worm screws, two helical pitch worm screws are adopted and fix-unsteady supporting way, two helical pitch worm screws two ends respectively have one group of ball bearing to be positioned at support set and are positioned in the framework, and the end of two helical pitch worm screw floating ends overlaps connecting band wheel, cog belt to servomotor by swelling; The ball bearing both sides of two helical pitch worm screw stiff ends also are provided with the thrust ball bearing and the end that is locked separately, realize axial thrust; Sealing ring is all installed at edge at two helical pitch worm screws two ends end cap, support set and worm gear top and bottom and reinforced seal part, forms an enclosed cavity, is full of worm and worm wheel oil and realizes lubricated in this chamber.

The effect that the application of this pair helical pitch gap eliminator for worm and wormwheel in the yaw structure can realize: the gap adjustment technology of 1. two helical pitch worm and gears, 2. worm-wheel shaft is to position of related features ± 0.02mm; 3. the temperature of two helical pitch worm and gears suppresses, and worm screw is regulated in the rightabout crack that disappears that transverse tooth thickness increases and is controlled in the 0.02mm.Reduction of speed is than big, can reach 120: 1, the characteristics of compact conformation, stable working, noiselessness, inhibition heating, more has sideshake easy to adjust and can transfer to very little advantage.Be applicable to the yaw structure in the processing of aviation complex structural member, thereby break external monopolization and blockade on new techniques to have the important strategic meaning to improving the China's Aviation Industry level.

Description of drawings

Accompanying drawing 1 is the two application schematic diagrames of helical pitch worm and gear drives structure in a kind of yaw structure;

Accompanying drawing 2 is the two helical pitch worm and gear drives structure generalized sections in Fig. 1 yaw;

Accompanying drawing 3 is the two helical pitch worm and gear transmission vertical views of yaw;

The specific embodiment

The design's the installation site of two helical pitch gap eliminator for worm and wormwheel on yaw that is used for yaw that is used for yaw as shown in Figure 1, servomotor 1 is fixed on the framework 2, two helical pitch worm screws 12 in the backlash eliminating equipment are positioned at 2 li of frameworks, worm gear 23 is connected as a single entity by screw on the worm gear circumference and swing component 3, swing component 3 comprises several parts shown in Figure 1, realizes swing under the driving of two helical pitch worm screws 12.Shown in Figure 2 is the section of two helical pitch worm and gear drives structure of Fig. 1 middle frame 2 inside, the two helical pitch worm screws 12 that are positioned at the center are adopted fixing-unsteady supporting way, the big belt wheel that servomotor 1 connects on the yaw power among Fig. 2, big belt wheel drives small pulley 7 by cog belt 4, small pulley 7 is fixed on the end of two helical pitch worm screw 12 floating end B by swelling cover 5, the floating end B of two helical pitch worm screws 12 has one group of ball bearing 11 to be positioned at floating end support set 10, another stiff end A has ball bearing 15 to be positioned in the stiff end support set 14, two support sets are fixed in the framework 2, floating end B end cap 9 and stiff end A end cap 22 are separately fixed on floating end support set 10 and the stiff end support set 14, and are positioned on two helical pitch worm screws 12 by floating end jump ring 6 and stiff end jump ring 16 respectively; Ball bearing 15 both sides of two helical pitch worm screw 12 stiff ends are provided with thrust ball bearing 13 and thrust ball bearing 19, the locking nut 21 end A that is locked, and realize axial thrust; Sealing ring is all installed at end cap 9, floating end B support set 10 and stiff end A end cap 22, stiff end A support set 14 and worm gear 23 above and below and reinforced seal part 8 edges at floating end B, forms an enclosed cavity, is full of worm and worm wheel oil and realizes lubricated in this chamber.

This pair helical pitch gap eliminator for worm and wormwheel key is 1. to guarantee that the centre-to-centre spacing of worm and gear engagement is 280 ± 0.02mm; 2. worm-wheel shaft is to position of related features ± 0.02mm; 3. worm screw is regulated in the rightabout crack that disappears that transverse tooth thickness increases and is controlled in the 0.02mm.Direction of arrow C among Fig. 3 is the direction that transverse tooth thickness increases.

Assemble the gap-eliminating structure of above-mentioned pair of helical pitch worm and gear, it is characterized in that setting worm gear transmission ratio, provide framework 2 machined parameters, the centre-to-centre spacing and the worm-wheel shaft of worm and gear engagement guarantee to the Precision Machining of position of related features by framework 2; Calculate and provide the machined parameters of worm and gear, the swing torque that the worm and gear that processes drives balance staff is 4000N.m, selected motor and worm gear transmission ratio 120: 1; The adjustment distance in crack of axially disappearing is 5mm; Require to entrust worm and gear manufacturing firm to process by drawing according to these, and the axial location tolerance that requires machine to add worm and gear should guarantee worm screw axial motion 1mm, drive gap radial variations 0.03mm between worm and gear, to eliminate the sideshake of worm gear 23 and two helical pitch worm screws 12, it is in the 0.02mm that sideshake is adjusted target, by calculating: 0.02 * 1/0.03 ≈ 0.67mm, the thickness that draws adjusting pad should be than the big 0.67mm of theoretical value, adjusting radial extension with adjusting pad 17 is 5mm, fill up radially 1mm of every adjustment, end play can change 0.03mm, as principle, adjusting to an approximate location is, by the swing of worm and gear, can measure the gap with dial gauge, with the calculating contrast, finally be as the criterion, only just can guarantee that with adjusting pad sideshake transfers in the 0.02mm with the result who measures.

In order to guarantee two helical pitch worm and gear transmission correct engagement, also need to be undertaken the radially engagement adjustment of two helical pitch worm screws 12 by the worm gear adjusting pad 24 below the worm gear, by the three-dimensional coordinates measurement and the analysis engagement situation of grinding worm and gear with lead powder, make this gap transfer to ± 0.02mm in; Settle adjusting pad 17 in stiff end support set 14 peripheries, eliminate two helical pitch worm shafts to sideshake to adjust, the adjusting range of adjusting pad 17 is≤5mm, processing request according to worm and gear: fill up every adjustment 1mm, end play can change 0.03mm, so the adjusting range in gap is within 5 * 0.03=0.15mm.

For guaranteeing the wearability and the life-span of worm gear pair, worm gear pair has adopted has hardness and the good alloy material of wearability; Lubricating oil adopts the N320 worm and worm wheel oil, and adhesive force is big, has reduced the bigger shortcoming of two helical pitch worm and gear wearing and tearing.The two helical pitch worm and gear device swing torques of this cover can reach 4000N.m, and slew rate can reach 10rpm, is applicable to large torque, the 5-axis machining center of high-speed cutting processing.

Job state: servomotor drives cog belt 4 by big belt wheel, drive small pulley 7 rotations, small pulley 4 is fixed with two helical pitch worm screws 12 under the effect of swelling cover 5, driving two helical pitch worm screws 12 by swelling cover 5 rotates, two helical pitch worm screws 12 are rotated under the support of ball bearing 11 and 15, overcome the axial force in the worm and gear transmission under thrust ball bearing 13 and 19 supports, two helical pitch worm screws 12 drive worm gear 23 transmissions, and worm gear rotates the swing that has realized balance staff.Supporting construction shown in Figure 3 is adopted in whole transmission, stiff end A realizes axial thrust by one group of thrust bearing, one group of ball bearing is realized supporting, and floating end B relies on one group of ball bearing to realize supporting, and this support is easy to discharge the thermal stretching that heating produces in the worm and gear transmission.

Claims (2)

1. two helical pitch gap eliminator for worm and wormwheel that are used for yaw, be applicable to the disappear crack and the driving of various oscillating head mechanisms, it is characterized in that adopting two helical pitch worm structures, servomotor is fixed on the framework, worm gear and swing component are connected as a single entity, and realize swing under two helical pitch worm drive; Two helical pitch worm screws are adopted and fix-unsteady supporting way, and two helical pitch worm screws two ends respectively have one group of ball bearing to be positioned on the support set, and support set is positioned in the framework, and the end of two helical pitch worm screw floating ends overlaps connecting band wheel, cog belt to servomotor by swelling; The ball bearing both sides of two helical pitch worm screw stiff ends also are provided with the thrust ball bearing and the end that is locked separately, realize axial thrust; Sealing ring is all installed at edge at two helical pitch worm screws two ends end cap, support set and worm gear top and bottom and reinforced seal part, forms an enclosed cavity, is full of worm and worm wheel oil and realizes lubricated in this chamber.

2. the two helical pitch gap eliminator for worm and wormwheel that are used for yaw according to claim 1, it is characterized in that servomotor (1) connects big belt wheel, big belt wheel drives small pulley (7) by cog belt (4), small pulley (7) is fixed on the end of two helical pitch worm screw (12) floating end B by swelling cover (5), the floating end of two helical pitch worm screws (12) has one group of ball bearing (11) to be positioned at floating end B support set (10), another stiff end has ball bearing (15) to be positioned in the stiff end A support set (14), two support sets are fixed in the framework (2), floating end B end cap (9) and stiff end A end cap (22) are separately fixed on floating end support set (10) and the stiff end support set (14), and are positioned on two helical pitch worm screws (12) by floating end B jump ring (6) and stiff end A jump ring (16) respectively; Ball bearing (15) both sides of two helical pitch worm screws (12) stiff end A are provided with thrust ball bearing (13) and thrust ball bearing (19), locking nut (21) end that is locked, and realize axial thrust.

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