Outer cylindrical guide sleeve inner ball spline

Abstract

The utility model discloses an outer cylindrical guide sleeve inner ball spline, and relates to the field of mechanical transmission. By arranging eight groups of outer ball channels on the outer wall of the rectangular shaft and adopting high-bearing plane ball channel stress points on four sides, compared with a linear ball guide rail which can only be stressed on one side, the four-side high-torque transmission can be realized, the torque transmission capability is effectively improved, the application requirement of a high-torque scene is met, and the service life of the bearing is prolonged. The external connection grooves are formed in the outer wall of the outer shaft sleeve at equal angles and can be connected with an external rotating mechanism, 360-degree rotating operation is achieved, the limitation that a rotatable ball spline arc face can only be applied in a small-torque scene is overcome, the application range is expanded, and under the condition that the whole ball spline does not need to be separated from the external rotating mechanism, the service life of the ball spline is prolonged. Therefore, the inner shaft sleeve and parts such as the balls in the inner shaft sleeve can be conveniently maintained or replaced, the maintenance cost and difficulty are reduced, and the maintainability of equipment is improved.

Description

Technical Field

[0001] The utility model relates to the field of mechanical transmission, in particular to an outer cylindrical guide sleeve inner ball spline. Background Art

[0002] In existing mechanical transmissions, spline connection is a commonly used method for transmitting torque and achieving axial movement, and is widely used in the industrial field. In modern mechanical manufacturing, the requirements for transmission components are becoming increasingly higher. They not only need to be able to transmit torque efficiently, but also need to have good linear motion accuracy, high load capacity and long service life.

[0003] Existing high-precision linear transmission ball splines are commonly found in square linear guide rails (generally with 2 or 4 ball tracks on the plane). This design is only used in linear on-track reciprocating motion scenarios. There is also a circular design of linear ball splines (generally with 2 ball tracks on the arc surface). The arc surface is subject to less force and torque than the flat surface. The advantage is that it can have both linear motion and a circular left-right rotational motion structure.

[0004] However, the linear ball guide can only bear force on one side, which means that when it is subjected to large torque, its force distribution is uneven, which can easily lead to increased local wear, thereby affecting the transmission accuracy and service life. Moreover, this limitation makes the linear ball guide unable to fully play its role in some application scenarios with high torque requirements; although the arc surface design of the rotatable ball spline can achieve a certain degree of rotational motion, its application in high torque scenarios is greatly limited because the arc surface bears less force and torque than the flat surface. In actual use, when it is necessary to transmit large torque, When torque is applied, the rotatable ball spline may experience problems such as slipping and wear, and cannot meet the needs of high-torque scenarios; in summary, the existing linear ball guides and rotatable ball splines have obvious deficiencies in torque transmission capabilities and application scenarios. Therefore, it is necessary to develop a new ball spline structure to solve the above problems and meet the needs of modern machinery manufacturing for high torque and multi-scenario applications. Therefore, a square-axis 8-ball-way high-torque and high-load ball spline is proposed, which can achieve high torque on all four sides and linear reciprocating motion in 360-degree rotation operation scenarios. Utility Model Content

[0005] Based on this, the purpose of the present invention is to provide an outer cylindrical guide sleeve with an inner ball spline to solve the technical problems mentioned in the above background technology.

[0006] To achieve the above-mentioned object, the utility model provides the following technical solution: an outer cylindrical guide sleeve inner ball spline comprises a rectangular shaft, an outer sleeve and an inner sleeve, the outer wall of the rectangular shaft is provided with two sets of outer ball tracks corresponding to the balls, and the inner wall of the inner sleeve is provided with multiple sets of inner ball tracks corresponding to the outer ball tracks;

[0007] The outer wall of the inner sleeve is provided with an outer sleeve, and the outer wall of the outer sleeve is provided with an external connection groove for connecting it to an external rotating mechanism. The end of the outer sleeve is installed with a fixing seat connected to the end of the inner sleeve, and the fixing seat is connected to the end of the outer sleeve through a convenient disassembly mechanism.

[0008] By adopting the above technical solution, a basis is provided for achieving functions such as high torque transmission, 360-degree rotation operation and convenient maintenance, and the problems existing in the existing technology are effectively solved.

[0009] Furthermore, two groups of outer ball tracks are symmetrically installed on the four outer walls of the rectangular shaft, forming a total of eight groups of outer ball tracks.

[0010] By adopting the above technical solution, the force fulcrum is increased, so that the average point force is smaller under the same external force, thereby extending the service life and achieving high torque transmission on four sides, overcoming the limitation that the linear ball guide can only bear force on one side.

[0011] Furthermore, the outer sleeve is designed to be cylindrical as a whole, and a plurality of external grooves are provided on the outer wall of the outer sleeve at equal angles.

[0012] By adopting the above technical solution, the outer sleeve can be stably connected to the external rotating mechanism to achieve 360-degree rotation operation, expanding the application scenarios of the ball spline and solving the problem that the arc surface of the rotatable ball spline can only be used in small torque scenarios.

[0013] Furthermore, the easy-to-disassemble mechanism includes bolts and threaded holes, the bolts are slidably connected to the fixing seat, and the end of the inner sleeve is provided with multiple groups of threaded holes corresponding to the bolts at equal angles.

[0014] By adopting the above technical solution, the connection and disassembly of the fixing seat and the inner sleeve are facilitated, which provides convenience for the maintenance and replacement of the inner sleeve and its internal components, and reduces the maintenance cost and difficulty.

[0015] Furthermore, the easy disassembly mechanism also includes an easy disassembly groove formed at the end of the outer sleeve and corresponding to the fixing seat, and positioning blocks abutting against the outer wall of the fixing seat are symmetrically installed in the easy disassembly groove.

[0016] By adopting the above technical solution, the provision of the disassembly groove and the positioning block further enhances the stability of the connection between the fixing seat and the outer sleeve, and can better position and fix the fixing seat during the disassembly and installation process, ensuring smooth operation.

[0017] Furthermore, a rotating shaft is installed at the end of the fixing seat located in the easy-to-disassemble groove, and an adjustment groove corresponding to the rotating shaft is opened at the end of the outer sleeve.

[0018] By adopting the above technical solution, the fixing seat can be flexibly rotated during disassembly and installation, which is convenient for position adjustment and improves the efficiency and convenience of maintenance.

[0019] Furthermore, the width of the adjustment slot corresponds to the diameter of the rotating shaft, and the length of the adjustment slot is greater than the length of the rotating shaft.

[0020] By adopting the above technical solution, it is ensured that the rotating shaft can rotate smoothly in the adjustment groove, while also limiting the movement range of the rotating shaft, thereby improving the stability of the structure.

[0021] Furthermore, the side wall of the fixing seat is symmetrically provided with through slots corresponding to the positioning block. When the fixing seat and the outer sleeve are fixed in position, the position of the through slot is staggered with the position of the positioning block.

[0022] By adopting the above technical solution, the positioning block can pass smoothly when the fixing seat is disassembled, which facilitates the rotation and disassembly of the fixing seat. After the fixing seat is installed, it can prevent its accidental rotation, ensuring the normal operation of the ball spline.

[0023] Furthermore, the inner walls of the through grooves are designed to be arc-shaped, and the center of the arc-shaped surface of the through grooves is located on the same straight line as the center of the rotating shaft.

[0024] By adopting the above technical solution, the movement of the positioning block in the through slot becomes smoother, friction and wear are reduced, and the reliability and service life of the structure are improved.

[0025] Furthermore, the corners of the positioning block and the corners of the through slot opening are both designed with arc-shaped rounded corners.

[0026] By adopting the above technical solution, jamming or damage during installation and disassembly is avoided, and the convenience of operation and the safety of the structure are further improved.

[0027] In summary, the present invention has the following beneficial effects:

[0028] 1. The utility model sets eight groups of external ball tracks on the outer wall of the rectangular shaft, and the four sides are designed with high-load-bearing flat ball track force points. Compared with the linear ball guide rail that can only bear force on one side, the utility model can achieve high torque transmission on four sides, effectively improving the torque transmission capacity and meeting the application requirements of high torque scenarios. By opening multiple groups of external grooves at equal angles on the outer wall of the outer sleeve, it can be connected to the external rotating mechanism to achieve 360-degree rotation operation, overcoming the limitation that the circular arc surface of the rotatable ball spline can only be used in small torque scenarios, and expanding the scope of application.

[0029] 2. The utility model is provided with a convenient disassembly mechanism, so that the inner sleeve and its internal ball and other components can be easily maintained or replaced without separating the entire ball spline from the external rotating mechanism, thereby reducing maintenance costs and difficulty and improving the maintainability of the equipment. The connection structure between the fixed seat and the outer sleeve is reasonably designed, and even if the bolts are slightly loose, the fixed seat can still effectively fix the inner sleeve, ensuring the structural stability and reliability of the ball spline during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0031] Figure 2 This is a schematic diagram of the planar structure of the utility model after the inner shaft side is cut away and then unfolded;

[0032] Figure 3 For this utility model Figure 1 Enlarged view of point A in the middle;

[0033] Figure 4 This is a schematic diagram of the three-dimensional structure of the outer shaft sleeve of the utility model after side section;

[0034] Figure 5 This is a schematic diagram of the three-dimensional structure of the outer shaft sleeve of the utility model when the fixing seat is disassembled after the side section.

[0035] In the figure: 1. Rectangular shaft; 2. External ball track; 3. External sleeve; 31. External groove; 4. Inner sleeve; 41. Inner ball track; 5. Fixed seat; 51. Easy-to-remove groove; 52. Adjustment groove; 6. Positioning block; 7. Through groove. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] The utility model provides an outer cylindrical guide sleeve with an inner ball spline, which is mainly intended to solve the problems that the existing linear ball guide can only bear force on one side and the rotatable ball spline arc surface can only be used in small torque scenarios. Its core innovation lies in the unique structural design, which realizes high torque transmission on four sides and 360-degree rotation operation, and is also easy to maintain.

[0038] The following describes an embodiment of the present invention based on its overall structure.

[0039] Ball spline inside the outer cylindrical guide sleeve, such as Figure 1 - Figure 5 As shown, the ball spline mainly consists of a rectangular shaft 1, an outer sleeve 3 and an inner sleeve 4.

[0040] Among them, the outer wall of the rectangular shaft 1 is provided with two groups of outer ball paths 2 corresponding to the balls, and the inner wall of the inner sleeve 4 is provided with multiple groups of inner ball paths 41 corresponding to the outer ball paths 2. The outer ball paths 2 on the rectangular shaft 1 cooperate with the balls in the inner sleeve 4. When the rectangular shaft 1 slides, the balls roll along the ball paths, which can greatly reduce the friction resistance and make the movement of the rectangular shaft 1 smoother. At the same time, it can also effectively reduce energy loss and improve transmission efficiency. In addition, the design of eight groups of outer ball paths 2 increases the force fulcrum, so that the average point force is smaller under the same external force, thereby extending the service life and realizing four-sided high torque transmission, overcoming the limitation that the linear ball guide can only bear force on one side, and can better meet the application requirements of high torque scenarios.

[0041] This embodiment also provides an outer sleeve 3 on the outer wall of the inner sleeve 4, and the outer wall of the outer sleeve 3 is provided with an external groove 31 for connecting it to an external rotating mechanism. The outer sleeve 3 plays a role in protecting internal components. At the same time, its cylindrical design makes the outer sleeve 3 more stable during rotation. The setting of the external groove 31 enables the outer sleeve 3 to be stably connected to the external rotating mechanism to achieve 360-degree rotation operation, expand the application scenarios of the ball spline, and solve the problem that the arc surface of the rotatable ball spline can only be used in small torque scenarios, so that the ball spline can adapt to more complex working environments.

[0042] This embodiment further installs a fixing seat 5 connected to the end of the inner sleeve 4 at the end of the outer sleeve 3, and the fixing seat 5 is connected to the end of the outer sleeve 3 through a convenient disassembly mechanism. The function of the fixing seat 5 is to fix the inner sleeve 4 to ensure that the inner sleeve 4 does not move during operation and to ensure the normal operation of the ball spline. The design of the convenient disassembly mechanism facilitates the connection and disassembly of the fixing seat 5 and the outer sleeve 3, provides convenience for the maintenance and replacement of the inner sleeve 4 and its internal components, and reduces the maintenance cost and difficulty.

[0043] In this embodiment, two groups of external ball tracks 2 are symmetrically installed on the outer walls of the four sides of the rectangular shaft 1, forming a total of eight groups of external ball tracks 2. The four sides are designed with high-load-bearing planar ball track force points. Compared with the linear ball guide rail that can only bear force on one side, the utility model can achieve high torque transmission on four sides, effectively improving the torque transmission capacity and meeting the application requirements of high torque scenarios.

[0044] For example, the outer sleeve 3 is designed to be cylindrical as a whole, and a plurality of sets of external grooves 31 are provided at equal angles on the outer wall of the outer sleeve 3. The external grooves 31 can be connected to an external rotating mechanism to achieve 360-degree rotation operation, thereby overcoming the limitation that the rotatable ball spline arc surface can only be used in small torque scenarios and expanding the scope of application.

[0045] In some examples, the easy-to-disassemble mechanism includes bolts and threaded holes. The bolts are slidably connected to the fixing seat 5, and multiple groups of threaded holes corresponding to the bolts are opened at equal angles on the end of the inner sleeve 4. The combination of the bolts and the threaded holes makes the connection between the fixing seat 5 and the inner sleeve 4 firm and reliable, and easy to disassemble. When the inner sleeve 4 and its internal components need to be maintained or replaced, the fixing seat 5 and the inner sleeve 4 can be easily separated by simply unscrewing the bolts.

[0046] In addition, the easy disassembly mechanism also includes an easy disassembly groove 51 opened at the end of the outer sleeve 3 and corresponding to the fixed seat 5. The easy disassembly groove 51 is symmetrically installed with a positioning block 6 that is in contact with the outer wall of the fixed seat 5. The easy disassembly groove 51 provides space for the movement of the fixed seat 5, and the positioning block 6 plays a role in positioning and fixing the fixed seat 5, ensuring that the fixed seat 5 can be accurately installed on the outer sleeve 3 during the installation process and will not shake or deviate during use.

[0047] It should also be emphasized that a rotating shaft is installed at the end of the fixing seat 5 located in the easy-to-disassemble groove 51, and an adjustment groove 52 corresponding to the rotating shaft is opened at the end of the outer sleeve 3. The cooperation between the rotating shaft and the adjusting groove 52 enables the fixing seat 5 to be flexibly rotated during disassembly and installation, which is convenient for adjusting the position and improves the efficiency and convenience of maintenance. When disassembling the fixing seat 5, the rotating shaft can rotate in the adjusting groove 52, so that the fixing seat 5 can be smoothly rotated out of or back into the easy-to-disassemble groove 51.

[0048] Through this easy-to-disassemble mechanism design, the inner sleeve 4 and its internal ball and other components can be easily maintained or replaced without separating the entire ball spline from the external rotating mechanism, reducing maintenance costs and difficulty and improving the maintainability of the equipment.

[0049] Of course, in other examples, the easy-to-disassemble structure can be a rotatable connection between the fixing seat 5 and the top of the outer sleeve 3, as well as bolts and threaded holes. When the inner sleeve 4 needs to be replaced, the bolts can be directly removed, and then the fixing seat 5 can be rotated to remove the inner sleeve 4.

[0050] In summary, the present invention realizes four-sided high torque transmission and 360-degree rotation operation through the above-mentioned structural design, and is convenient for maintenance, thus having high practical value.

[0051] The working principle of the utility model is as follows: when the ball spline is used, the rectangular shaft 1 starts to slide. Because the outer wall of the rectangular shaft 1 is provided with eight groups of outer ball tracks 2, when the rectangular shaft 1 moves horizontally in the inner sleeve 4, the more ball tracks there are, the more force fulcrums there are under the same external force, the smaller the average point force is, and the longer its service life is; and the four sides are designed with high-load-bearing flat ball track force points, so this design solves the limitation that the linear ball guide can only bear force on one side, because the outer wall of the outer sleeve 3 is provided with multiple groups of external grooves 31 at equal angles, so that it can be connected to the external rotating mechanism, when rotation is required, the external rotating mechanism can drive the outer sleeve 3 to rotate, solving the problem that the arc surface of the rotatable ball spline can only be used in small torque scenarios. This design can achieve high torque on all four sides and can achieve linear reciprocating motion in 360-degree rotation operation scenarios;

[0052] When it is necessary to maintain or replace the ball bearings and other components in the inner sleeve 4, the bolts connected to the end of the inner sleeve 4 are removed, and the fixing seat 5 is pushed into the easy-to-remove groove 51, so that the positioning block 6 is in contact with the inner wall of the through groove 7. At this time, the fixing seat 5 can be rotated until the fixing seat 5 is rotated to a state where the position of the fixing seat 5 is offset from the inner sleeve 4. At this time, the inner sleeve 4 can be removed, so that the inner sleeve 4 can be maintained without separating the entire ball spline from the external rotating mechanism.

[0053] During subsequent installation, push the inner sleeve 4 into the outer sleeve 3, then rotate the fixing base 5 in the opposite direction and pull it outward from the easy-to-remove slot 51 until the shaft abuts against the inner wall of the adjustment slot 52. At this point, the bolt positions on the fixing base 5 will correspond to the threaded holes, and then re-tighten the bolts to complete the installation of the inner sleeve 4.

[0054] When the fixing seat 5 slides outward from the easy-to-remove groove 51, the positioning block 6 will return to a state of being in contact with the top of the fixing seat 5, so that the fixing seat 5 cannot rotate, thereby ensuring that even if the bolts are slightly loosened during subsequent use, it will not affect the fixing of the fixing seat 5 to the inner sleeve 4.

[0055] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not limitations on the present invention. The specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and purpose of the present invention, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. Ball spline inside the outer cylindrical guide sleeve, characterized by: It comprises a rectangular shaft (1), an outer shaft sleeve (3) and an inner shaft sleeve (4); the outer wall of the rectangular shaft (1) is provided with two groups of outer ball paths (2) corresponding to the balls; the inner wall of the inner shaft sleeve (4) is provided with multiple groups of inner ball paths (41) corresponding to the outer ball paths (2); The outer wall of the inner sleeve (4) is provided with an outer sleeve (3), and the outer wall of the outer sleeve (3) is provided with an external connection groove (31) for connecting it to an external rotating mechanism. The end of the outer sleeve (3) is provided with a fixing seat (5) connected to the end of the inner sleeve (4), and the fixing seat (5) is connected to the end of the outer sleeve (3) through a convenient disassembly mechanism.

2. The outer cylindrical guide sleeve inner ball spline according to claim 1, characterized in that: Two groups of outer ball tracks (2) are symmetrically mounted on the four outer walls of the rectangular shaft (1), forming a total of eight groups of outer ball tracks (2).

3. The ball spline with inner cylindrical guide sleeve according to claim 1, characterized in that: The outer sleeve (3) is designed to be cylindrical as a whole, and a plurality of groups of external grooves (31) are provided on the outer wall of the outer sleeve (3) at equal angles.

4. The outer cylindrical guide sleeve inner ball spline according to claim 1, characterized in that: The easy-to-disassemble mechanism comprises a bolt and a threaded hole, the bolt is slidably connected to the fixing seat (5), and the end of the inner sleeve (4) is provided with a plurality of groups of threaded holes corresponding to the bolts at equal angles.

5. The outer cylindrical guide sleeve inner ball spline according to claim 1, characterized in that: The easy disassembly mechanism further comprises an easy disassembly groove (51) provided at the end of the outer sleeve (3) and corresponding to the fixing seat (5), wherein a positioning block (6) is symmetrically mounted in the easy disassembly groove (51) and abuts against the outer wall of the fixing seat (5).

6. The ball spline with inner cylindrical guide sleeve according to claim 5, characterized in that: The end of the fixing seat (5) located in the disassembly slot (51) is provided with a rotating shaft, and the end of the outer sleeve (3) is provided with an adjustment slot (52) corresponding to the rotating shaft.

7. The ball spline with inner cylindrical guide sleeve according to claim 6, characterized in that: The width of the adjustment slot (52) corresponds to the diameter of the rotating shaft, and the length of the adjustment slot (52) is greater than the length of the rotating shaft.

8. The outer cylindrical guide sleeve inner ball spline according to claim 7, characterized in that: The side wall of the fixing seat (5) is symmetrically provided with a through slot (7) corresponding to the positioning block (6); when the fixing seat (5) and the outer shaft sleeve (3) are fixed in position, the position of the through slot (7) is staggered with the position of the positioning block (6).

9. The outer cylindrical guide sleeve inner ball spline according to claim 8, characterized in that: The inner wall of the through groove (7) is designed to be an arc surface, and the center of the arc surface of the through groove (7) is located on the same straight line as the center of the rotating shaft.

10. The ball spline with inner cylindrical guide sleeve according to claim 9, characterized in that: The corners of the positioning block (6) and the opening corners of the through slot (7) are both designed to be arc-shaped and rounded.

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