Axial clearance compensation threaded lead screw
By using an axial clearance compensation screw design, and employing a slide bar and lubrication mechanism to eliminate axial clearance, the problem of return error during reverse movement of the screw is solved, achieving high-precision motion of the transmission system and ensuring the transmission accuracy and stability of the mechanical system.
Patent Information
- Application Number
- CN202520245228.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-02-17
AI Technical Summary
The existing threaded screw has axial backlash during reverse motion, which causes return error and affects the positioning accuracy of high-precision reciprocating motion. Furthermore, the error increases with the time of use.
The screw design with axial clearance compensation is adopted. Through the cooperation of the slide bar and nut, the lubrication mechanism is used to achieve automatic lubrication and preload to eliminate axial clearance and improve transmission accuracy.
It significantly improves the transmission accuracy of the lead screw, reduces backlash error, and ensures that the mechanical system maintains high precision and repeatability during frequent movements.
Smart Images
Figure CN223725323U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to thread screw technology field especially relates to axial gap compensation thread screw. BACKGROUND
[0002] Thread screw is a kind of mechanical element that realizes linear motion transmission through screw pair, it is mainly composed of screw and nut, screw is processed with external thread, and nut has internal thread matched with it, when screw rotates, due to the action of thread, nut will carry out linear motion along the axial direction of screw, or when nut is fixed, rotating screw can realize linear motion of screw itself
[0003] Thread on screw can be trapezoidal thread, ball screw thread of different types, thread screw can realize accurate linear displacement control in mechanical transmission, can bear certain axial load and torque, and its reliability and stability make it indispensable key component in each field, and it provides powerful support for the accurate motion and positioning of various equipment.
[0004] Although thread screw has many advantages, but also there are some deficiencies, there is gap between threads, when screw reverses motion, return error will appear, which can cause inaccurate positioning in the application requiring high-precision reciprocating motion, influence the performance of equipment, and return error will gradually increase with the increase of use time. UTILITY MODEL CONTENTS
[0005] In order to make up for the above shortcomings, the utility model provides axial gap compensation thread screw, aims at improving the problem that there is gap between threads in prior art, when screw reverses motion, return error will appear, which can cause inaccurate positioning in the application requiring high-precision reciprocating motion, influence the performance of equipment, and return error will gradually increase with the increase of use time.
[0006] In order to realize the above purpose, the utility model adopts the following technical scheme: axial gap compensation thread screw, including screw, the middle left side of screw is connected with first nut by thread, the middle right side of screw is connected with second nut by thread, the adjacent side of first nut and second nut is fixedly connected with U-shaped block, the outer wall of U-shaped block is rotatably connected with slide rod one, the other end of slide rod one is rotatably connected with connecting block, the middle part of connecting block is rotatably connected with threaded rod, the middle lower part of threaded rod is connected with threaded sleeve by thread, the outer wall of threaded sleeve is fixedly connected with slide rod two, the both ends of slide rod two are fixedly connected with sliding block, the inner wall of sliding block is slidably connected with the outer wall of slide rod one, the inner wall of first nut is provided with lubricating mechanism, and the lubricating mechanism is used to add lubricant.
[0007] As further description of the above technical scheme:
[0008] The lubricating mechanism comprises a tank body, the outer wall of the tank body is fixedly connected with the inner wall of the first nut, the inner wall of the tank body is fixedly connected with a fixing seat, the bottom surface of the fixing seat is fixedly connected with a spring, the other end of the spring is fixedly connected with a rolling ring, the inner wall of the rolling ring is rotatably connected with a rolling ball, the outer wall of the rolling ball is provided with a leakage groove, and the inner wall of the leakage groove is fixedly connected with a plurality of partitions.
[0009] As a further description of the above technical solution:
[0010] Both ends of the lead screw are fixedly connected with fixing blocks, and adjacent two fixing blocks are fixedly connected with an auxiliary rod.
[0011] As a further description of the above technical solution:
[0012] The outer wall of the threaded rod is fixedly connected with a circular limiting block, and the outer walls of the first nut and the second nut are fixedly connected with long limiting blocks.
[0013] As a further description of the above technical solution:
[0014] The outer wall of the second nut is fixedly connected with an outer shell, and the outer shell is slidingly connected with the first nut.
[0015] The top of the tank body is clamped with a cover, and the top of the cover is fixedly connected with a handle.
[0016] As a further description of the above technical solution:
[0017] The bottom of the cover is fixedly connected with an inner ring, and the outer wall of the inner ring is fixedly connected with a leak-proof gasket.
[0018] As a further description of the above technical solution:
[0019] The top of the threaded rod is fixedly connected with a knob, and the outer wall of the knob is provided with an anti-skid groove.
[0020] The utility model has the advantages of the following beneficial effects:
[0021] 1、in the utility model, by the threaded sleeve upward movement, the bottom of two slide rods is opened outward, thereby driving the first nut along the axial direction, makes the first nut and the second nut to the lead screw produce pre-tightening force, thereby eliminating the axial gap, the transmission precision of the lead screw is improved significantly.
[0022] 2、in the utility model, by the rolling ball rolling in the rolling ring, the leakage groove carries out the lubricant, the spring provides the elastic force, makes the rolling ball always close to the outer wall of the lead screw, realizes the automatic addition of lubricant, can ensure that the contact surface of the lead screw and the nut always keeps good lubrication state. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 A front side perspective view of the axial gap compensation threaded screw rod according to the present application is shown in the figure;
[0024] Figure 2 A partial structure exploded view of the first nut of the axial gap compensation threaded screw rod according to the present application is shown in the figure;
[0025] Figure 3 An enlarged view of A is shown in the figure;
[0026] Figure 4 A partial structure display view of the tank body of the axial gap compensation threaded screw rod according to the present application is shown in the figure;
[0027] Figure 5 A split view of the lubricating mechanism of the axial gap compensation threaded screw rod according to the present application is shown in the figure.
[0028] LEGEND:
[0029] 1, screw rod; 2, lubricating mechanism; 201, rolling ball; 202, tank body; 203, rolling ring; 204, spring; 205, fixed seat; 206, spacer; 207, leakage groove; 3, first nut; 4, second nut; 5, U-shaped block; 6, sliding rod one; 7, sliding block; 8, threaded sleeve; 9, sliding rod two; 10, connecting block; 11, threaded rod; 12, fixed block; 13, auxiliary rod; 14, shell; 15, knob; 16, anti-skid groove; 17, circular limiting block; 18, long limiting block; 19, leakage gasket; 20, cover; 21, handle; 22, inner ring. DETAILED DESCRIPTION
[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0031] Please refer to the drawings in the embodiments of the present application Figure 1 - the drawings in the embodiments of the present application Figure 3The utility model provides an embodiment: axial gap compensation screw rod, including screw rod 1, the left side of the middle part of screw rod 1 is connected with first nut 3, the right side of the middle part of screw rod 1 is connected with second nut 4, the adjacent side of first nut 3 and second nut 4 is fixedly connected with U -shaped block 5, the outer wall of U -shaped block 5 is rotatably connected with slide bar one 6, the other end of slide bar one 6 is rotatably connected with connecting block 10, the middle part of connecting block 10 is rotatably connected with threaded rod 11, the middle lower part of threaded rod 11 is connected with threaded sleeve 8, the outer wall of threaded sleeve 8 is fixedly connected with slide bar two 9, the both ends of slide bar two 9 are fixedly connected with sliding block 7, the inner wall of sliding block 7 is slidably connected with the outer wall of slide bar one 6, the inner wall of first nut 3 is provided with lubricating mechanism 2, and lubricating mechanism 2 is used for adding lubricant,
[0032] Specifically, the first nut 3 is closely matched with the screw rod 1, when the screw rod 1 rotates, it can move linearly along the axial direction of the screw rod 1, the second nut 4 also realizes linear motion along the axial direction of the screw rod 1 by thread matching with the screw rod 1, the second nut 4 is arranged opposite to the first nut 3, the adjacent side of the first nut 3 and the second nut 4 is fixedly connected with the U-shaped block 5, the U-shaped block 5 is firmly welded on the nut, which provides stable support for subsequent connection and transmission, and the U-shaped design enables the subsequent connected components to flexibly rotate and move within a certain range, the connecting block 10 is rotatably connected with the slide bar one 6 as an intermediate connecting piece, the threaded sleeve 8 is threadedly matched with the threaded rod 11, so that when the threaded rod 11 rotates, the threaded sleeve 8 can move up and down along the axial direction of the threaded rod 11, the slide bar two 9 is firmly welded on the threaded sleeve 8 and moves synchronously with the threaded sleeve 8. The slide bar two 9 plays a supporting and force transmitting role in the transmission system, and the sliding block 7 is closely connected with the slide bar two 9, thereby providing stable sliding support for the entire transmission system. The inner wall of the sliding block 7 is slidably connected with the outer wall of the slide bar one 6, so that the sliding block 7 can smoothly slide on the slide bar one 6.
[0033] Please refer to the attached Figure 4 -attached Figure 5 The lubricating mechanism 2 comprises a tank body 202, the outer wall of the tank body 202 is fixedly connected with the inner wall of the first nut 3, the inner wall of the tank body 202 is fixedly connected with a fixed seat 205, the bottom surface of the fixed seat 205 is fixedly connected with a spring 204, the other end of the spring 204 is fixedly connected with a rolling ring 203, the inner wall of the rolling ring 203 is rotatably connected with a rolling bead 201, the outer wall of the rolling bead 201 is provided with a leakage groove 207, and the inner wall of the leakage groove 207 is fixedly connected with a plurality of spacers 206.
[0034] Specifically, the tank 202 serves as the main container of the lubrication mechanism 2. The fixed base 205 is securely installed inside the tank 202, providing stable support for subsequent components such as the spring 204 and rolling ring 203. One end of the spring 204 is tightly welded to the bottom surface of the fixed base 205, possessing a certain elastic coefficient. The spring 204 plays a crucial role in the lubrication mechanism 2, providing corresponding elastic force according to different working conditions to drive subsequent components. The rolling ring 203 is connected to the fixed base 205 via the spring 204, allowing it to move to a certain extent under the action of the spring 204. The design of the rolling ring 203 allows the internal rolling balls 201 to rotate freely, thus achieving uniform distribution of lubricant. The groove 207 is a carefully machined groove structure on the outer wall of the rolling balls 201, its function being to store and release lubricant. The shape and size of the groove 207 can be designed according to actual needs to ensure it can hold an appropriate amount of lubricant and release it to the parts requiring lubrication at the appropriate time.
[0035] Please see the appendix Figure 1 - Appendix Figure 2 Both ends of the lead screw 1 are fixedly connected to a fixing block 12, and an auxiliary rod 13 is fixedly connected between adjacent fixing blocks 12. A circular limiting block 17 is fixedly connected to the outer wall of the threaded rod 11. A long limiting block 18 is fixedly connected to the outer wall of the first nut 3 and the second nut 4. A housing 14 is fixedly connected to the outer wall of the second nut 4. The housing 14 is slidably connected to the first nut 3.
[0036] Specifically, the fixed block 12 is connected to both ends of the lead screw 1 by welding. The fixed block 12 provides stable support and limit function for the lead screw 1, preventing excessive displacement or shaking of the lead screw 1 during operation. The two ends of the auxiliary rod 13 are tightly connected to the two fixed blocks 12 respectively, providing additional stability and rigidity for the entire device. The circular limit block 17 is firmly installed on the outer wall of the threaded rod 11, which plays the role of limiting the axial displacement of the connecting block 10. The circular limit block 17 can prevent the connecting block 10 from leaving its predetermined working range during movement. The outer shell 14 is firmly connected to the outer wall of the second nut 4 by welding, bolt connection or other means. The outer shell 14 provides protection for the internal components, preventing external dust, impurities, etc. from entering and affecting the normal operation of the device. The outer shell 14 and the first nut 3 are connected by a sliding connection, so that the first nut 3 can slide relative to each other in the outer shell 14. This connection method not only ensures the relative movement between the first nut 3 and the second nut 4, but also provides a certain degree of stability and guidance for the entire device.
[0037] Please see the appendix Figure 3 - Appendix Figure 5The top of the tank body 202 is clamped with a cover 20, the top of the cover 20 is fixedly connected with a handle 21, the bottom of the cover 20 is fixedly connected with an inner ring 22, the outer wall of the inner ring 22 is fixedly connected with a leak-proof gasket 19, the top of the threaded rod 11 is fixedly connected with a knob 15, and the outer wall of the knob 15 is provided with an anti-skid groove 16.
[0038] Specifically, the cover 20 is tightly connected with the top of the tank body 202 through a precise clamping structure, which facilitates the installation and disassembly of the cover 20 and can also ensure that the cover 20 will not easily fall off during work, effectively preventing the leakage of lubricant in the tank body 202. The handle 21 provides a convenient gripping position, making it easy to operate when the cover 20 needs to be opened or closed. The inner ring 22 is tightly installed at the bottom of the cover 20 and forms a whole with the cover 20. The inner ring 22 functions to tightly cooperate with the inner wall of the tank body 202 when the cover 20 is closed, further enhancing the sealing performance of the cover 20. The knob 15 is firmly installed at the top of the threaded rod 11, and the position of the threaded rod 11 can be easily adjusted by rotating the knob 15, thereby achieving the adjustment of the entire device.
[0039] Working principle: rotate the anti-skid groove 16 to make the threaded sleeve 8 slide upward. Since the slide rod two 9 is fixed with the threaded sleeve 8, the slide rod one 6 is rotationally connected with the connecting block 10, and the slide block 7 is slidingly connected with the slide rod one 6 and the slide rod two 9. When the threaded sleeve 8 moves upward, the bottoms of the two slide rod ones 6 expand outward, thereby pushing the first nut 3 along the axial direction, so that the first nut 3 and the second nut 4 generate a pre-tightening force on the lead screw 1, thereby eliminating the axial gap, significantly improving the transmission accuracy of the lead screw, greatly reducing the return error, and enabling the mechanical system to maintain high motion accuracy and repeatability during frequent forward and reverse rotation.
[0040] The rolling beads 201 roll in the rolling ring 203, the leakage groove 207 carries out the lubricant, the partition 206 separates the lubricant, is closed, the spring 204 provides the elastic force, makes the rolling beads 201 always close to the outer wall of the lead screw 1, realizes the automatic addition of the lubricant, can ensure that the contact surface of the lead screw and the nut always maintains good lubrication state.
[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements to some technical features, as long as they are within the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made within the scope of the present application shall be included in the protection scope of the present application.
Claims
1. Axial gap compensation threaded screw, comprising a screw (1), characterized in that: The middle left side of the lead screw (1) is threadedly connected with a first nut (3), the middle right side of the lead screw (1) is threadedly connected with a second nut (4), the adjacent side of the first nut (3) and the second nut (4) is fixedly connected with a U-shaped block (5), the outer wall of the U-shaped block (5) is rotatably connected with a sliding rod one (6), the other end of the sliding rod one (6) is rotatably connected with a connecting block (10), the middle of the connecting block (10) is rotatably connected with a threaded rod (11), the middle lower part of the threaded rod (11) is threadedly connected with a threaded sleeve (8), the outer wall of the threaded sleeve (8) is fixedly connected with a sliding rod two (9), the two ends of the sliding rod two (9) are fixedly connected with a sliding block (7), the inner wall of the sliding block (7) is slidably connected with the outer wall of the sliding rod one (6), the inner wall of the first nut (3) is provided with a lubricating mechanism (2), and the lubricating mechanism (2) is used for adding lubricant.
2. The axial gap compensation threaded screw lead according to claim 1, wherein: The lubricating mechanism (2) comprises a tank body (202), the outer wall of the tank body (202) is fixedly connected with the inner wall of the first nut (3), the inner wall of the tank body (202) is fixedly connected with a fixed seat (205), the bottom surface of the fixed seat (205) is fixedly connected with a spring (204), the other end of the spring (204) is fixedly connected with a rolling ring (203), the inner wall of the rolling ring (203) is rotatably connected with a rolling bead (201), the outer wall of the rolling bead (201) is provided with a leakage groove (207), and the inner wall of the leakage groove (207) is fixedly connected with a plurality of partition plates (206).
3. The axial gap compensation threaded screw lead screw of claim 1, wherein: The two ends of the lead screw (1) are fixedly connected with a fixed block (12), and the adjacent between the two fixed blocks (12) is fixedly connected with an auxiliary rod (13).
4. The axial gap compensation threaded screw lead screw of claim 1, wherein: The outer wall of the threaded rod (11) is fixedly connected with a circular limiting block (17), and the outer wall of the first nut (3) and the second nut (4) is fixedly connected with a long limiting block (18).
5. The axial gap compensation threaded screw lead screw as set forth in claim 1, further characterized by: The outer wall of the second nut (4) is fixedly connected with an outer shell (14), and the outer shell (14) is slidably connected with the first nut (3).
6. The axial gap compensation threaded screw lead screw as set forth in claim 2, further characterized by: The top of the tank body (202) is clamped with a cover (20), and the top of the cover (20) is fixedly connected with a handle (21).
7. The axial gap compensation threaded screw lead according to claim 6, wherein: The bottom of the cover (20) is fixedly connected with an inner ring (22), and the outer wall of the inner ring (22) is fixedly connected with a leakage-proof gasket (19).
8. The axial gap compensation threaded screw lead screw of claim 1, wherein: The top of the threaded rod (11) is fixedly connected with a knob (15), and the outer wall of the knob (15) is provided with an anti-skid groove (16).