Ball spline structure

Abstract

The utility model provides a ball spline structure which comprises a spline shaft provided with a plurality of ball grooves, an outer cylinder arranged on the spline shaft in a sliding and sleeving mode and an end cover located at one end of the outer cylinder, the outer wall of the side, away from the end cover, of the outer cylinder protrudes to form an installation portion, and first ball grooves corresponding to the ball grooves are formed in the inner wall of the outer cylinder. A second ball groove communicated with the first ball groove is formed in the mounting part, a third ball groove communicated with the first ball groove is formed in the end cover, and the first ball groove, the second ball groove and the third ball groove are matched to form a ball channel used for containing balls; an annular oil cavity is formed in the mounting part, and an elastic lubricating assembly is arranged in the oil cavity. The elastic lubricating assembly automatically adjusts the supply amount of lubricating oil according to the motion state and the lubricating requirement of the balls, and it is guaranteed that the optimal lubricating effect can be kept under different working conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to linear transmission device technical field, in particular to a kind of ball spline structure. BACKGROUND

[0002] In the field of mechanical transmission, ball spline is widely used in automation equipment, precision machine tool, robot and other fields as an important linear motion device. The traditional ball spline structure is usually composed of spline shaft, outer tube (nut) and end cover, wherein the ball circulates and rolls in the ball groove between the outer tube and the spline shaft, realizing low-friction linear motion. However, in practical application, the lubrication problem of ball spline has always been a key challenge. Insufficient or improper lubrication can cause wear between the ball and the contact surface, increase the running resistance, shorten the service life, and affect the stability and precision of the whole system, and in non-working state, the problem of lubricating oil leaking out from oil cavity or other parts due to poor sealing or design defects is prone to occur. SUMMARY

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a ball spline structure for solving the problem of lubricating oil leakage in non-working state in the prior art.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides the following technical scheme:

[0005] A ball spline structure, comprising a spline shaft with a plurality of ball grooves, an outer tube slidably sleeved on the spline shaft, an end cover located at one end of the outer tube, a mounting portion protruding from the outer wall of the side of the outer tube away from the end cover, a first ball groove corresponding to the ball groove is formed in the inner wall of the outer tube, a second ball groove is formed in the mounting portion and communicates with the first ball groove, a third ball groove is formed in the end cover and communicates with the first ball groove, the first ball groove, the second ball groove and the third ball groove cooperate to form a ball channel for placing balls; an annular oil cavity is formed in the mounting portion, and an elastic lubricating assembly is arranged in the oil cavity.

[0006] The spline shaft has a plurality of ball grooves which are uniformly distributed along the length direction of the shaft, the outer cylinder is sleeved on the spline shaft, and the inner wall is provided with first ball grooves corresponding to the ball grooves on the spline shaft; the end cover is located at one end of the outer cylinder and is used for closing the outer cylinder and providing support; the mounting portion is formed on the outer wall of the outer cylinder away from the end cover, and the inside is provided with an annular oil cavity and an elastic lubricating assembly. By arranging the annular oil cavity and the elastic lubricating assembly on the mounting portion of the outer cylinder, appropriate lubricating oil can be continuously provided for the balls, so that each ball can be uniformly and effectively lubricated, the wear caused by insufficient lubrication is reduced, and the overall service life of the spline is prolonged. In the process of ball circulation, the elastic lubricating assembly continuously extrudes lubricating oil from the annular oil cavity and delivers the lubricating oil to the ball channel. The elastic lubricating assembly automatically adjusts the supply amount of lubricating oil according to the motion state and lubrication demand of the ball, so that the best lubrication effect can be maintained under different working conditions.

[0007] In an embodiment of the present application, a ball groove is formed in the mounting portion and communicates with the oil cavity and the second ball groove, and a lubricating ball abutting against the ball is arranged in the ball groove.

[0008] The above technical solution is realized. With the movement of the ball, the lubricating ball continuously absorbs lubricating oil from the oil cavity and applies the lubricating oil to the surface of the ball through contact with the ball. This design enables the lubricating oil to be uniformly distributed, avoiding the problems of insufficient or excessive lubrication in a local area. In a non-working state, the elastic assembly enables the lubricating ball to tightly adhere to the ball groove, thereby preventing lubricating oil from leaking.

[0009] In an embodiment of the present application, the elastic assembly comprises an upper abutting plate abutting against the upper wall of the oil cavity, an arc-shaped lower abutting plate abutting against the lubricating ball, and a spring arranged between the upper abutting plate and the lower abutting plate.

[0010] The above technical solution is realized. The elastic assembly is composed of the upper abutting plate, the lower abutting plate and the spring arranged between them; the upper abutting plate abuts against the upper wall of the oil cavity, and the arc-shaped lower abutting plate abuts against the lubricating ball. In a non-working state, the pre-tightening force of the spring acts on the lubricating ball through the lower abutting plate, so that the lubricating ball tightly adheres to the ball groove to prevent lubricating oil from leaking.

[0011] In an embodiment of the present application, an oil injection channel communicating with the oil cavity is formed in the mounting portion, and an oil plug is plugged in the oil injection channel.

[0012] The above technical solution is realized. The oil injection channel provides a convenient way for the operator to supplement lubricating oil into the oil cavity when needed. The oil plug is plugged in the oil injection channel, so that lubricating oil cannot leak out of the oil injection channel in a non-maintenance state.

[0013] In one embodiment of the present invention, the length of the upper abutment plate is greater than the diameter of the oil injection channel, and when the upper abutment plate abuts against the oil injection channel, a through hole is provided on the upper abutment plate.

[0014] To achieve the above technical solution, the length of the upper abutment plate is designed to be greater than the diameter of the oil injection channel. This design ensures that the upper abutment plate provides a stable support surface when in contact with the oil injection channel; when the upper abutment plate abuts against the oil injection channel, through holes are provided on the upper abutment plate. These through holes allow lubricating oil to flow from the oil injection channel into the oil chamber, ensuring the connectivity between the oil chamber and the outside, facilitating the replenishment and flow of lubricating oil.

[0015] In one embodiment of this utility model, the mounting portion is provided with a plurality of mounting holes evenly distributed in the circumferential direction.

[0016] To achieve the above technical solution, the mounting section has several mounting holes evenly spaced circumferentially. These mounting holes are used to fix the ball spline structure to other mechanical structures or equipment. The design of multiple mounting holes allows the ball spline structure to adapt to different installation requirements; whether installed vertically, horizontally, or at an angle, a suitable mounting point can be found.

[0017] As described above, the ball spline structure of this utility model has the following beneficial effects: by providing an annular oil cavity and an elastic lubrication component in the outer cylinder mounting part, a suitable amount of lubricating oil can be continuously provided to the balls, ensuring that each ball receives uniform and effective lubrication; uniform and effective lubrication reduces the coefficient of friction between the balls and the spline shaft and the inner wall of the outer cylinder, enabling the ball spline to operate with lower energy consumption; the elastic component applies continuous pressure to the lubricating ball, ensuring that the lubricating ball always adheres tightly to the balls and can draw lubricating oil from the oil cavity; the elastic lubrication component automatically adjusts the supply of lubricating oil according to the movement state and lubrication requirements of the balls, ensuring that the best lubrication effect is maintained under different working conditions; the continuous pressure provided by the elastic component ensures that the lubricating ball remains tightly fitted to the ball groove when not in operation, preventing lubricating oil leakage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 A cross-sectional view of this utility model.

[0020] Figure 3 Displayed as Figure 2 A magnified view of a portion of point A in the middle.

[0021] Component designation explanation

[0022] 1, bead groove; 2, spline shaft; 3, outer cylinder; 4, end cover; 5, mounting portion; 6, first ball groove; 7, second ball groove; 8, third ball groove; 9, oil cavity; 10, ball groove; 11, lubricating ball; 12, upper abutting plate; 13, lower abutting plate; 14, spring; 15, oil injection channel; 16, oil plug; 17, through hole; 18, mounting hole. DETAILED DESCRIPTION

[0023] The implementation of the present application will be described by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0024] Please refer to Figures 1 to 3 The present application provides a kind of ball spline structure, including the spline shaft 2 with multiple bead groove 1, the outer cylinder 3 of sliding sleeve in the spline shaft 2, end cover 4 in the outer cylinder 3 one end, the outer wall of the outer cylinder 3 away from the end cover 4 side protrudes and forms mounting portion 5, the inner wall of the outer cylinder 3 is opened with first ball groove 6 corresponding with the bead groove 1, the second ball groove 7 of the first ball groove 6 is opened with the mounting portion 5, the third ball groove 8 of the first ball groove 6 is opened with the end cover 4, the first ball groove 6, second ball groove 7 and third ball groove 8 cooperate and form the ball channel for placing ball;Annular oil cavity 9 is opened in the mounting portion 5, and the elastic lubricating assembly is arranged in the oil cavity 9.

[0025] The spline shaft 2 has multiple bead grooves 1, which are uniformly distributed along the length direction of the shaft, the outer cylinder 3 is slidably sleeved on the spline shaft 2, and the inner wall is provided with the first ball groove 6 corresponding to the bead groove 1 on the spline shaft 2; The end cover 4 is located at one end of the outer cylinder 3, which is used to close the outer cylinder 3 and provide support; The mounting portion 5 is formed on the outer wall of the outer cylinder 3 away from the end cover 4, and the annular oil cavity 9 and the elastic lubricating assembly are arranged inside. By arranging the annular oil cavity 9 and the elastic lubricating assembly on the mounting portion 5 of the outer cylinder 3, the appropriate amount of lubricating oil can be continuously provided for the balls, ensuring that each ball can be uniformly and effectively lubricated, reducing wear caused by insufficient lubrication, and prolonging the overall life of the ball spline. In the process of ball circulation, the elastic lubricating assembly continuously extrudes lubricating oil from the annular oil cavity 9 and delivers it to the ball channel. The elastic lubricating assembly automatically adjusts the supply amount of lubricating oil according to the motion state and lubrication demand of the ball, so that the best lubrication effect can be maintained under different working conditions.

[0026] The ball groove 10 is opened on the mounting portion 5, which communicates the oil cavity 9 and the second ball groove 7, and the lubricating ball 11 abuts against the ball in the ball groove 10, and the elastic assembly is arranged between the lubricating ball 11 and the upper wall of the oil cavity 9.

[0027] With the movement of the ball, the lubricating ball 11 will constantly absorb lubricating oil from the oil cavity 9 and apply it to the surface of the ball through contact. This design allows the lubricating oil to be evenly distributed, avoiding the problem of local insufficient or excessive lubrication. In the non-working state, the elastic assembly makes the lubricating ball 11 closely fit the ball groove 10, preventing the leakage of lubricating oil.

[0028] The elastic assembly includes an upper abutting plate 12 abutting against the upper wall of the oil cavity 9, a lower abutting plate 13 abutting against the lubricating ball 11 and being arc-shaped, and a spring 14 arranged between the upper abutting plate 12 and the lower abutting plate 13. The elastic assembly is composed of the upper abutting plate 12, the lower abutting plate 13 and the spring 14 arranged between them; the upper abutting plate 12 abuts against the upper wall of the oil cavity 9, while the lower abutting plate 13 is arc-shaped and abuts against the lubricating ball 11. In the non-working state, the pre-tightening force of the spring 14 acts on the lubricating ball 11 through the lower abutting plate 13, so that the lubricating ball 11 closely fits the ball groove 10 to prevent the leakage of lubricating oil.

[0029] An oil injection channel 15 communicating with the oil cavity 9 is formed in the mounting portion 5, and an oil plug 16 is plugged in the oil injection channel 15. The oil injection channel 15 provides a convenient way for the operator to supplement lubricating oil into the oil cavity 9 when needed. The oil plug 16 is plugged in the oil injection channel 15 to ensure that lubricating oil does not leak out of the oil injection channel 15 in the non-maintenance state.

[0030] The length of the upper abutting plate 12 is greater than the diameter of the oil injection channel 15, and through holes 17 are formed in the upper abutting plate 12 when the upper abutting plate 12 abuts against the oil injection channel 15. The length of the upper abutting plate 12 is designed to be greater than the diameter of the oil injection channel 15. This design ensures that the upper abutting plate 12 can provide a stable support surface when it comes into contact with the oil injection channel 15; when the upper abutting plate 12 abuts against the oil injection channel 15, through holes 17 are formed in the upper abutting plate 12. These through holes 17 allow lubricating oil to flow from the oil injection channel 15 into the oil cavity 9, ensuring the connectivity of the oil cavity 9 with the outside, facilitating the supplement and flow of lubricating oil.

[0031] A plurality of mounting holes 18 are uniformly formed in the circumference of the mounting portion 5. A plurality of mounting holes 18 are uniformly formed in the circumference of the mounting portion 5, and these mounting holes 18 are used to fix the ball spline structure to other mechanical structures or equipment. The design of multiple mounting holes 18 allows the ball spline structure to adapt to different installation requirements, whether it is vertical, horizontal or inclined installation, and suitable mounting points can be found.

[0032] By setting the annular oil cavity 9 and the elastic lubricating assembly on the outer cylinder 3 installation part 5, the appropriate amount of lubricating oil can be continuously provided for the ball, ensuring that each ball can be uniformly and effectively lubricated; uniform and effective lubrication reduces the friction coefficient between the ball and the spline shaft 2 and the inner wall of the outer cylinder 3, so that the ball spline can run at lower energy consumption; the elastic assembly continuously exerts pressure on the lubricating ball 11, ensuring that the lubricating ball 11 is always closely attached to the ball, and can absorb lubricating oil from the oil cavity 9; the elastic lubricating assembly automatically adjusts the supply amount of lubricating oil according to the movement state and lubrication demand of the ball, ensuring that the best lubrication effect can be maintained under different working conditions; the continuous pressure provided by the elastic assembly makes the lubricating ball 11 still closely attached to the ball groove 10 in the non-working state, preventing lubricating oil leakage.

[0033] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. All equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should still be covered by the claims of the present application.

Claims

1. A ball spline structure, comprising a spline shaft having multiple ball grooves, an outer cylinder slidably sleeved on the spline shaft, and an end cap located at one end of the outer cylinder, characterized in that: The outer wall of the outer cylinder away from the end cap has a protrusion to form a mounting part. A first ball groove corresponding to the ball groove is opened in the inner wall of the outer cylinder. A second ball groove communicating with the first ball groove is opened on the mounting part. A third ball groove communicating with the first ball groove is opened on the end cap. The first ball groove, the second ball groove and the third ball groove cooperate to form a ball channel for placing balls. The mounting section has an annular oil cavity, and the oil cavity is equipped with an elastic lubrication component.

2. The ball spline structure according to claim 1, characterized in that: The mounting part has a ball groove that connects the oil cavity and the second ball groove. The ball groove has a lubricating ball that abuts against the ball. An elastic component is provided between the lubricating ball and the upper wall of the oil cavity.

3. The ball spline structure according to claim 2, characterized in that: The elastic component includes an upper abutment plate that abuts against the upper wall of the oil cavity, a lower abutment plate that abuts against the lubricating ball and is arc-shaped, and a spring disposed between the upper abutment plate and the lower abutment plate.

4. The ball spline structure according to claim 3, characterized in that: The mounting part has an oil injection channel that connects to the oil cavity, and an oil plug is sealed in the oil injection channel.

5. The ball spline structure according to claim 4, characterized in that: The length of the upper abutment plate is greater than the diameter of the oil injection channel, and when the upper abutment plate abuts against the oil injection channel, a through hole is provided on the upper abutment plate.

6. The ball spline structure according to claim 1, characterized in that: The mounting part has a number of mounting holes evenly distributed around its circumference.

Images