CN112879517B - Lead screw supporting and limiting structure - Google Patents
Lead screw supporting and limiting structure Download PDFInfo
- Publication number
- CN112879517B CN112879517B CN202110075730.8A CN202110075730A CN112879517B CN 112879517 B CN112879517 B CN 112879517B CN 202110075730 A CN202110075730 A CN 202110075730A CN 112879517 B CN112879517 B CN 112879517B
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- China
- Prior art keywords
- screw rod
- limiting block
- nut
- support ring
- limiting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000009434 installation Methods 0.000 claims description 18
- 238000005452 bending Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/60—Power-operated mechanisms for wings using electrical actuators
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2900/00—Application of doors, windows, wings or fittings thereof
- E05Y2900/50—Application of doors, windows, wings or fittings thereof for vehicles
- E05Y2900/502—Application of doors, windows, wings or fittings thereof for vehicles for aircraft or spacecraft
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2900/00—Application of doors, windows, wings or fittings thereof
- E05Y2900/50—Application of doors, windows, wings or fittings thereof for vehicles
- E05Y2900/53—Type of wing
- E05Y2900/531—Doors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
The invention relates to a screw rod supporting and limiting structure which comprises a screw rod, a nut, an actuating rod, a nut limiting block, a screw rod limiting block, a supporting ring and a cylindrical pin. The nut limiting block is arranged on the nut, and the screw rod limiting block and the support ring are arranged on the screw rod through a cylindrical pin or other fastening modes. According to the invention, the screw rod self-supporting is realized through the matching of the screw rod limiting block, the support ring structure and the actuating rod, when the load of the screw rod is larger, the actuating rod or the screw rod is bent and deformed, the outer wall surface of the support ring is contacted with the inner hole of the actuating rod, the supporting force is provided, and the bending rigidity of the screw rod can be greatly improved. Simultaneously, realize the lead screw spacing that targets in place through nut stopper and lead screw stopper, prevent that lead screw nut from deviating from.
Description
Technical Field
The invention belongs to the field of mechanical transmission, and relates to a screw rod supporting and limiting structure.
Background
The actuating system of a cargo door of an airplane adopts an electromechanical actuating scheme of a motor, a speed reducer and a lead screw, and an actuating cylinder is omitted to reduce the size of a linear actuating part in order to ensure that the actuator does not interfere with components such as a top decorative plate and the like during movement. Because the actuator is long, after the actuator cylinder is cancelled, the bending rigidity of the lead screw is poor, and the lead screw extends out in place without mechanical limitation, so that the risk of the lead screw and the lead screw nut falling off exists.
Disclosure of Invention
The invention solves the technical problems that: the defects of the prior art are overcome, the screw supporting and limiting structure is provided, screw supporting and in-place limiting are achieved, and screw supporting rigidity is improved.
The technical scheme of the invention is as follows:
a screw rod supporting and limiting structure comprises a screw rod, a nut, an actuating rod, a nut limiting block, a screw rod limiting block, a supporting ring and a cylindrical pin;
the nut is sleeved on the screw rod, and the front end of the nut is provided with a nut limiting block; the screw rod limiting block is of an annular structure, first limiting bulges are processed on the outer wall surface, 2 first positioning bulges are processed on the inner wall surface, the 2 first positioning bulges are symmetrical along the center of the screw rod limiting block, a boss is processed on the outer wall surface corresponding to each first positioning bulge, two first pin holes are processed on the screw rod limiting block, and the two first pin holes are symmetrical along the center of the screw rod limiting block;
the support ring is of an annular structure, two second pin holes are machined in the support ring, the two second pin holes are symmetrical along the center of the support ring, two clamping grooves are machined in the inner wall surface of the support ring, and the two clamping grooves are symmetrical along the center of the support ring;
the screw rod limiting block and the support ring are sleeved together, a boss of the screw rod limiting block is clamped in a clamping groove of the support ring, and two first pin holes of the screw rod limiting block and two second pin holes of the support ring are in the same straight line; the integral structure formed by the two is arranged on the screw rod, the front end of the screw rod is processed with an installation seat, the installation seat is processed with two first installation grooves and two third pin holes, the two first installation grooves are symmetrical along the central axis of the screw rod, and the two third pin holes are symmetrical along the central axis of the screw rod; after the screw rod limiting block is installed in place, the first positioning bulge of the screw rod limiting block is clamped in the first installation groove to play a role in transmitting torque;
the cylindrical pin penetrates through the support ring, the screw rod limiting block and the pin hole of the screw rod, so that the support ring, the screw rod limiting block and the screw rod are fixed, and the support ring and the screw rod limiting block are prevented from falling off from the screw rod;
the actuating rod is sleeved outside the screw rod and is arranged at the front end of the nut.
The upper front end of the nut is provided with a second mounting groove for mounting a nut limiting block;
the nut limiting block is of an annular structure, a second positioning protrusion and a second limiting protrusion are processed on the outer wall surface of the nut limiting block, the second positioning protrusion and the second limiting protrusion form a finger-shaped structure, and the second positioning protrusion is located in the second mounting groove, so that the nut limiting block and the nut move simultaneously, and the torque transmission effect is achieved;
during operation, when the nut stretches out to the foremost end of the screw rod, the second limiting protrusion is in contact with the first limiting protrusion, the nut stops rotating relative to the screw rod, and meanwhile, the second positioning protrusion is clamped in the second mounting groove, so that the nut is limited, and the nut is prevented from falling off.
The outer wall surface of the support ring is in small clearance fit with the inner hole of the actuating rod.
The clearance is less than 0.1 mm.
And the first positioning bulge and the first mounting groove are in interference fit.
The interference is between 0.02mm and 0.04 mm.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the screw rod is supported by the screw rod through the matching of the screw rod limiting block, the support ring structure and the actuating rod, when the load of the screw rod is larger, the actuating rod or the screw rod is bent and deformed, the outer wall surface of the support ring is contacted with the inner hole of the actuating rod, the support force is provided, and the bending rigidity of the screw rod can be greatly improved.
(2) The screw rod in-place limiting is realized through the nut limiting block and the screw rod limiting block, and the screw rod nut is prevented from being separated.
Drawings
FIG. 1 is a view of a screw support and limit structure;
FIG. 2 is a view showing the end structure of the screw rod;
FIG. 3 is a view of the nut;
FIG. 4 is a diagram of a nut stop block;
FIG. 5 is a diagram of a screw rod stopper and a support ring;
FIG. 6 is a diagram of a screw in-position limiting structure;
fig. 7 is a view showing a support ring support structure.
Detailed Description
The invention is further elucidated with reference to the drawing.
The invention designs a screw supporting and in-place limiting structure on the screw, so that the screw is ensured to have enough bending rigidity and is not separated after being extended in place.
As shown in fig. 1, the screw supporting and limiting structure is composed of a screw 1, a nut 2, an actuating rod 3, a nut limiting block 4, a screw limiting block 5, a supporting ring 6 and a cylindrical pin 7. The nut limiting block 4 is arranged on the nut 2, and the screw rod limiting block 5 and the support ring 6 are arranged on the screw rod 1 through a cylindrical pin 7 or other fastening modes.
Specifically, as shown in fig. 3, a second mounting groove 2-1 structure is formed on the nut and used for mounting the nut limiting block. As shown in figure 2, the front end of the screw rod is provided with an installation seat 1-1, and the installation seat 1-1 is provided with a first installation groove 1-2 and a third pin hole 1-3. As shown in FIG. 4, the nut limiting block is of an annular structure, a second positioning protrusion 4-1 and a second limiting protrusion 4-2 are processed on the outer wall surface, and the second positioning protrusion 4-1 and the second limiting protrusion 4-2 form a finger-shaped structure. The second positioning protrusion 4-1 is positioned in the second mounting groove 2-1 so that the nut stopper and the nut move simultaneously. When the nut extends out of the foremost end of the screw rod 1 during operation, the second limiting bulge 4-2 is in contact with the first limiting bulge 5-1, the nut stops rotating relative to the screw rod, and meanwhile the second positioning bulge 4-1 is clamped in the second mounting groove 2-1, so that the nut is limited and prevented from falling off.
The second mounting groove 2-1 and the second positioning bulge 4-1 are in interference fit, and the interference magnitude is 0.02mm to 0.04 mm.
As shown in fig. 5, the screw rod limiting block 5 is an annular structure, first limiting protrusions 5-1 are processed on the outer wall surface, 2 first positioning protrusions 5-2 are processed on the inner wall surface, the 2 first positioning protrusions 5-2 are symmetrical along the center of the screw rod limiting block, a boss 5-3 is processed on the outer wall surface corresponding to each first positioning protrusion 5-2, two first pin holes 5-4 are processed on the screw rod limiting block, and the two first pin holes 5-4 are symmetrical along the center of the screw rod limiting block.
The support ring 6 is of an annular structure, two second pin holes 6-2 are machined in the support ring 6, the two second pin holes 6-2 are symmetrical along the center of the support ring 6, two clamping grooves 6-1 are machined in the inner wall surface of the support ring 6, and the two clamping grooves 6-1 are symmetrical along the center of the support ring 6;
when the screw rod limiting block 5 and the support ring 6 are installed, the boss 5-3 of the screw rod limiting block 5 is clamped in the clamping groove 6-1 of the support ring 6, and two first pin holes 5-4 of the screw rod limiting block 5 and two second pin holes 6-2 of the support ring 6 are on the same straight line; the integral structure formed by the two is arranged on a screw rod 1, an installation seat 1-1 is processed at the front end of the screw rod 1, two first installation grooves 1-2 and two pin holes 1-3 are processed on the installation seat 1-1, the two first installation grooves 1-2 are symmetrical along the central axis of the screw rod 1, and the two pin holes are symmetrical along the central axis of the screw rod 1; after the screw rod limiting block is installed in place, the first positioning bulge 5-2 of the screw rod limiting block 5 is clamped in the first installation groove 1-2 to play a role in transmitting torque.
The first positioning bulge 5-2 and the first mounting groove 1-2 are in interference fit, and the interference magnitude is 0.02mm to 0.04 mm.
And finally, matching pin holes and installing cylindrical pins. The cylindrical pin 7 penetrates through the pin holes of the support ring 6, the screw rod limiting block 5 and the screw rod 1, so that the support ring 6, the screw rod limiting block 5 and the screw rod 1 are fixed, and the support ring 6 and the screw rod limiting block 5 are prevented from falling off from the screw rod 1.
The actuating rod 3 is sleeved outside the screw rod 1 and is arranged at the front end of the nut 2 through a screw.
The outer wall surface of the support ring is in small clearance fit with the inner hole of the actuating rod. The clearance is less than 0.1 mm.
As shown in figure 6, when the screw rod extends out of the head, the screw rod rotates clockwise, the first limiting bulge 5-1 on the screw rod limiting block collides with the second limiting bulge 4-2 on the nut limiting block, and the nut is prevented from extending forwards continuously. The force transmission path at this time is: the screw rod body-the first mounting groove 1-2 of the screw rod-the first positioning bulge 5-2 of the screw rod limiting block-the second positioning bulge 4-2 of the first limiting bulge 5-1 of the screw rod limiting block-the second positioning bulge 4-1 of the nut limiting block-the second mounting groove 2-1 of the nut body. The force transmission path is provided with structural parts, so that the bearing capacity is high, and the limit failure caused by deformation can be avoided.
As shown in fig. 7, in the movement process of the screw rod, the outer ring of the support ring is matched with the inner hole of the actuating rod to play a supporting role, so that the bending strength of the screw rod is improved.
According to the screw rod, the support ring and the screw rod limiting block are arranged on the screw rod through a cylindrical pin (or other connecting schemes such as a screw) and the outer ring of the support ring is in small clearance fit with the inner hole of the actuating rod and used as an auxiliary support of the screw rod, so that the bending rigidity of the screw rod is improved. The nut limiting block is installed on the nut, and when the screw rod extends in place, the finger-shaped structure of the screw rod limiting block collides with the finger-shaped structure of the nut limiting block, so that the screw rod is limited in place.
Those skilled in the art will appreciate that the details not described in the present specification are well known.
Claims (5)
1. The utility model provides a lead screw supports and limit structure which characterized in that: the screw rod mechanism comprises a screw rod (1), a nut (2), an actuating rod (3), a nut limiting block (4), a screw rod limiting block (5), a support ring (6) and a cylindrical pin (7);
the nut (2) is sleeved on the screw rod (1), and the front end of the nut (2) is provided with a nut limiting block (4); the screw rod limiting block (5) is of an annular structure, first limiting bulges (5-1) are processed on the outer wall surface, 2 first positioning bulges (5-2) are processed on the inner wall surface, the 2 first positioning bulges (5-2) are symmetrical along the center of the screw rod limiting block, a boss (5-3) is processed on the outer wall surface corresponding to each first positioning bulge (5-2), two first pin holes (5-4) are processed on the screw rod limiting block, and the two first pin holes (5-4) are symmetrical along the center of the screw rod limiting block;
the support ring (6) is of an annular structure, two second pin holes (6-2) are machined in the support ring (6), the two second pin holes (6-2) are symmetrical along the center of the support ring (6), two clamping grooves (6-1) are machined in the inner wall surface of the support ring (6), and the two clamping grooves (6-1) are symmetrical along the center of the support ring (6);
the screw rod limiting block (5) and the support ring (6) are sleeved together, a boss (5-3) of the screw rod limiting block (5) is clamped in a clamping groove (6-1) of the support ring (6), and two first pin holes (5-4) of the screw rod limiting block (5) and two second pin holes (6-2) of the support ring (6) are on the same straight line; the integral structure formed by the two is arranged on the screw rod (1), the front end of the screw rod (1) is processed with an installation seat (1-1), the installation seat (1-1) is processed with two first installation grooves (1-2) and two third pin holes (1-3), the two first installation grooves (1-2) are symmetrical along the central axis of the screw rod (1), and the two third pin holes (1-3) are symmetrical along the central axis of the screw rod (1); after the screw rod limiting block (5) is installed in place, the first positioning bulge (5-2) of the screw rod limiting block (5) is clamped in the first installation groove (1-2) to play a role in transmitting torque;
the cylindrical pin (7) penetrates through the support ring (6), the screw rod limiting block (5) and a pin hole of the screw rod (1) to fix the support ring (6), the screw rod limiting block (5) and the screw rod (1) and prevent the support ring (6) and the screw rod limiting block (5) from falling off from the screw rod (1);
the actuating rod (3) is sleeved outside the screw rod (1) and is arranged at the front end of the nut (2).
2. The screw supporting and limiting structure of claim 1, wherein: the upper front end of the nut is provided with a second mounting groove (2-1) for mounting a nut limiting block;
the nut limiting block is of an annular structure, a second positioning protrusion (4-1) and a second limiting protrusion (4-2) are processed on the outer wall surface of the nut limiting block, the second positioning protrusion (4-1) and the second limiting protrusion (4-2) form a finger-shaped structure, and the second positioning protrusion (4-1) is located in the second mounting groove (2-1), so that the nut limiting block and the nut move simultaneously and play a role in transmitting torque;
when the nut is in work, when the nut extends out of the foremost end of the screw rod (1), the second limiting bulge (4-2) is in contact with the first limiting bulge (5-1), the nut stops rotating relative to the screw rod, and meanwhile the second positioning bulge (4-1) is clamped in the second mounting groove (2-1), so that the nut is limited and prevented from falling off.
3. The screw supporting and limiting structure of claim 1, wherein: the outer wall surface of the support ring is in small clearance fit with the inner hole of the actuating rod, and the clearance is smaller than 0.1 mm.
4. The screw supporting and limiting structure of claim 1, wherein: the first positioning bulge (5-2) is in interference fit with the first mounting groove (1-2).
5. The screw supporting and limiting structure of claim 4, wherein: the interference is between 0.02mm and 0.04 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110075730.8A CN112879517B (en) | 2021-01-20 | 2021-01-20 | Lead screw supporting and limiting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110075730.8A CN112879517B (en) | 2021-01-20 | 2021-01-20 | Lead screw supporting and limiting structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112879517A CN112879517A (en) | 2021-06-01 |
| CN112879517B true CN112879517B (en) | 2022-08-12 |
Family
ID=76050720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110075730.8A Active CN112879517B (en) | 2021-01-20 | 2021-01-20 | Lead screw supporting and limiting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112879517B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT413876B (en) * | 2004-07-23 | 2006-06-15 | Juergen Zimmermann | PARKING FACILITY |
| CN103089956B (en) * | 2011-10-31 | 2015-09-30 | 北京精密机电控制设备研究所 | A kind of roller screw drive linear actuator |
| JP6370097B2 (en) * | 2014-05-15 | 2018-08-08 | Thk株式会社 | Actuator |
| CN204553738U (en) * | 2015-02-27 | 2015-08-12 | 四川昱峰医疗器械有限公司 | Backboard elevating screw |
| CN106223766A (en) * | 2016-08-31 | 2016-12-14 | 东阳市甘特电气有限公司 | Sedan-chair Vehicular electric tail-gate push rod |
-
2021
- 2021-01-20 CN CN202110075730.8A patent/CN112879517B/en active Active
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| Publication number | Publication date |
|---|---|
| CN112879517A (en) | 2021-06-01 |
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