Automatic reset ball spline

Abstract

The utility model discloses an automatic reset ball spline, which relates to the field of ball splines and comprises a shaft rod and an outer sleeve. A ball raceway is arranged outside the shaft rod, and an inner raceway matched with the ball raceway is arranged on the inner wall of the outer sleeve. Isolation structures corresponding to the balls are arranged on the outer sleeve; a shaft clamping spring corresponding to the shaft rod is arranged in the outer sleeve, a fixed clamping spring corresponding to the shaft clamping spring is further arranged in the outer sleeve, and an automatic return spring corresponding to the fixed clamping spring and the shaft clamping spring is further arranged in the outer sleeve. Through the arrangement of the automatic return spring, when external force pushes the shaft rod to move forwards to extrude the automatic return spring to the shortest length, the external force is released, the automatic return spring is naturally bounced off, the shaft rod is driven to reset, only pushing force is needed, return pulling force is not needed, the next action time of using a ball spline in equipment and instruments is saved, and the working efficiency is improved. And meanwhile, the shaft rod does not need additional return pulling force, so that the energy consumption is reduced, and the energy consumption cost of reciprocating by using a ball spline is saved.

Description

Technical Field

[0001] The utility model relates to the field of ball splines, in particular to an automatic reset ball spline. Background Art

[0002] Ball splines are mainly used in mechanical transmission systems. They can achieve high-precision linear motion while transmitting torque and can withstand certain radial and axial loads. They are often used in machine tools, industrial robots and other equipment to ensure stable and precise movement of mechanical parts.

[0003] The ball spline is mainly composed of a spline shaft, a spline sleeve, balls and other components; the spline shaft has a spiral raceway on its surface, and the spline sleeve cooperates with the shaft and also has a corresponding raceway inside; balls are placed between the raceways to form rolling contact; when in use, when the spline shaft rotates, the torque can be transmitted through the rolling friction between the balls and the spline sleeve; at the same time, due to the action of the balls, the spline sleeve can perform high-precision linear motion along the spline shaft; this structure can not only achieve efficient torque transmission, but also ensure smooth linear movement; for example, in the joints of industrial robots, ball splines can transmit power under the drive of a motor, so that the robot's arm can perform precise rotation and linear motion to meet the requirements of complex work tasks; it can also withstand certain radial and axial loads, adapt to different working environments, and improve the reliability and stability of the equipment.

[0004] However, the currently common ball splines mainly rely on external power to achieve reciprocating motion between shafts. In terms of power requirements, in addition to the driving force required for forward motion, additional return pulling force is also required for the reciprocating motion of the shaft, which makes the power system complicated. Due to the need for additional return pulling force, the time it takes for the equipment to use the ball spline to perform the next action increases. In production lines with high requirements for operating speed, this will affect production efficiency, and the additional return pulling force will inevitably lead to an increase in energy consumption. For equipment that runs for a long time, the increase in energy consumption costs will significantly increase the company's operating costs. An improvement plan is urgently needed to solve these problems. Utility Model Content

[0005] Based on this, the purpose of the present invention is to provide an automatic reset ball spline to solve the technical problems mentioned in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic reset ball spline, comprising a shaft and a sleeve;

[0007] The shaft is provided with a ball rolling track on the outside, and the inner wall of the outer sleeve is provided with an inner rolling track that cooperates with the ball rolling track;

[0008] The outer sleeve is provided with an isolation structure corresponding to the ball;

[0009] The outer sleeve is provided with a shaft retaining spring corresponding to the shaft rod, and the outer sleeve is also provided with a fixed retaining spring corresponding to the shaft retaining spring, and the outer sleeve is also provided with an automatic return spring corresponding to the fixed retaining spring and the shaft retaining spring.

[0010] By adopting the above technical solution, the problem that the existing ball spline requires additional return pulling force during the reciprocating motion of the shaft is solved, thereby simplifying the power system, saving operation time and reducing energy consumption costs.

[0011] Furthermore, the isolation structure includes an inner ball isolation sleeve that cooperates with multiple groups of balls, and the ball isolation sleeve is provided on the shaft.

[0012] By adopting the above technical solution, the setting of the inner ball isolation sleeve can effectively prevent the balls from interfering with each other during the rolling process, ensuring the smooth rolling of the balls in the raceway, thereby ensuring the normal operation of the ball spline and improving the transmission efficiency and stability.

[0013] Furthermore, the inner wall of the outer sleeve is tightly fitted with the outer wall of the inner ball isolation sleeve.

[0014] By adopting the above technical solution, the inner wall of the outer sleeve fits tightly with the outer wall of the inner ball isolation sleeve, further enhancing the isolation effect, preventing the balls from deviating or falling off during operation, and improving the reliability and service life of the ball spline.

[0015] Furthermore, the shaft retaining spring is fixedly connected to the outer wall of the shaft rod, the fixed retaining spring is connected to the outer sleeve, and the fixed retaining spring is slidably connected to the shaft rod.

[0016] By adopting the above technical solution, the shaft retaining spring and the fixed retaining spring can stably fix the shaft rod and play a guiding role when the shaft rod moves, ensuring the stability and accuracy of the shaft rod in reciprocating motion.

[0017] Furthermore, the outer walls of the shaft retaining spring and the fixed retaining spring are both in contact with the inner wall of the outer sleeve.

[0018] By adopting the above technical solution, the stability of the shaft retaining spring and the fixed retaining spring during operation is ensured, the energy loss and mechanical wear caused by component shaking are reduced, and the overall performance and service life of the ball spline are improved.

[0019] Furthermore, one end of the automatic return spring is connected to the shaft retaining spring, and the other end is connected to the fixed retaining spring.

[0020] By adopting the above technical solution, the automatic return spring can effectively transfer elastic potential energy to the shaft rod, thereby realizing automatic resetting of the shaft rod. This connection method ensures the normal function of the automatic return spring during operation, and further improves the operational convenience and efficiency of the ball spline.

[0021] Furthermore, the diameter of the automatic return spring is smaller than the inner diameter of the outer sleeve, and the automatic return spring is sleeved on the shaft.

[0022] By adopting the above technical solution, it is ensured that the automatic return spring has enough space to expand and contract, and is supported by the shaft, so that it can better play the role of automatic reset, while avoiding failure or performance degradation caused by inappropriate spring size.

[0023] Furthermore, the shaft retaining spring and the fixed retaining spring are made of high-strength metal materials.

[0024] By adopting the above technical solution, the strength and durability of the shaft retaining spring and the fixed retaining spring are enhanced, so that they can withstand greater forces and longer use, the frequency of repair or replacement due to component damage is reduced, and the reliability and stability of the ball spline are improved.

[0025] Furthermore, an air inlet is provided on the shaft, and the air inlet is connected to an external air source.

[0026] By adopting the above technical solution, more functional possibilities are provided for the device.

[0027] Furthermore, an observation window is provided on the outer wall of the outer sleeve at the same position as the automatic return spring, and the length of the observation window is greater than the length of the automatic return spring.

[0028] By adopting the above technical solution, it is convenient for the user to observe the status of the automatic return spring, so as to promptly discover and deal with possible problems.

[0029] In summary, the present invention has the following beneficial effects:

[0030] The utility model is provided with an automatic return spring. When an external force pushes the shaft rod forward and squeezes the automatic return spring to the shortest length, the external force is released and the automatic return spring naturally springs open, driving the shaft rod to return to its original position. Only a pushing force is required, and no return pulling force is required, which saves the next action time of the ball spline used in equipment and instruments. At the same time, because the shaft rod does not require additional return pulling force, energy consumption is reduced, saving the energy consumption cost of using the ball spline for reciprocating motion. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural diagram of the utility model;

[0032] Figure 2 It is a schematic diagram of the structure of the utility model in top section.

[0033] In the figure: 1. Shaft; 2. Outer sleeve; 3. Ball raceway; 4. Inner raceway; 5. Inner ball isolation sleeve; 6. Shaft retaining spring; 7. Automatic return spring; 8. Fixed retaining spring; 9. Air inlet. DETAILED DESCRIPTION

[0034] 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.

[0035] The present utility model provides an automatic reset ball spline, which mainly solves the problem that the existing ball spline requires additional return pulling force during the reciprocating motion of the shaft, resulting in a complex power system, long operation time and high energy consumption cost. Its core innovation is to provide an automatic return spring 7 to achieve automatic reset of the shaft rod 1.

[0036] The following describes an embodiment of the present invention based on its overall structure.

[0037] Automatic reset ball spline, such as Figure 1 - Figure 2 As shown, the automatic reset ball spline mainly consists of a shaft 1 and an outer sleeve 2, wherein a ball raceway 3 is provided on the outside of the shaft 1 and an inner raceway 4 cooperating with the ball raceway 3 is provided on the inner wall of the outer sleeve 2; this structural design enables relative motion between the shaft 1 and the outer sleeve 2 through the balls, and is the basic structure for the ball spline to transmit torque and realize linear motion.

[0038] In this embodiment, the outer sleeve 2 is provided with a shaft retaining spring 6, a fixed retaining spring 8 and an automatic return spring 7;

[0039] Specifically, the shaft retaining spring 6 is fixedly connected to the outer wall of the shaft rod 1, the fixed retaining spring 8 is connected to the outer sleeve 2 and is slidably connected to the shaft rod 1, and one end of the automatic return spring 7 is connected to the shaft retaining spring 6, and the other end is connected to the fixed retaining spring 8;

[0040] When an external force pushes the shaft 1 to compress the automatic return spring 7 to the shortest length within a limited stroke, the external force disappears, and the automatic return spring 7 can automatically spring open, thereby driving the shaft 1 to reset; this automatic reset function makes the shaft 1 do not require additional return pulling force during reciprocating motion, which not only simplifies the power system, but also saves operation time and reduces energy consumption costs.

[0041] At the same time, the outer sleeve 2 in this embodiment is also provided with an isolation structure corresponding to the ball;

[0042] The isolation structure includes an inner ball isolation sleeve 5 that is sleeved on the shaft 1 and cooperates with multiple groups of balls, wherein the multiple groups of balls are installed in the inner ball isolation sleeve 5, and the inner wall of the outer sleeve 2 is tightly fitted with the outer wall of the inner ball isolation sleeve 5. The inner ball isolation sleeve 5 can effectively prevent the balls from interfering with each other during the rolling process, thereby ensuring the normal operation of the ball spline.

[0043] In some examples, an air inlet 9 is also provided on the shaft 1, which is connected to an external air source through the air inlet 9 and can be used to provide auxiliary power for the device or perform cooling operations;

[0044] In addition, an observation window is provided on the outer wall of the outer sleeve 2 at the same position as the automatic return spring 7, and the length of the observation window is greater than the length of the automatic return spring 7, so as to facilitate observation of the status of the automatic return spring 7.

[0045] The working principle of the utility model is as follows: in the initial state, the automatic return spring 7 is in a naturally extended state; when the shaft 1 is subjected to an external force, the shaft 1 moves relative to the outer sleeve 2 along the ball raceway 3 and the inner raceway 4; during this process, the balls roll in the ball raceway 3 and the inner raceway 4, realizing power transmission; at the same time, the shaft retaining spring 6 and the fixed retaining spring 8 play a fixing and guiding role, ensuring the smooth movement of the shaft 1;

[0046] As the shaft 1 moves, the automatic return spring 7 is gradually compressed; when the external force disappears, the automatic return spring 7 begins to return to its original state by virtue of its own elastic potential energy, generating a reverse force; this force acts on the shaft retaining spring 6 and the fixed retaining spring 8, thereby driving the shaft 1 to move in the opposite direction, achieving automatic reset of the shaft 1;

[0047] During the entire working process, the inner ball isolation sleeve 5 effectively prevents the balls from interfering with each other during the rolling process, ensuring the normal operation of the ball spline; the air inlet 9 can be connected to an external air source according to actual needs to provide auxiliary power for the device or perform cooling and other operations; and the observation window arranged on the outer wall of the outer sleeve 2 is longer than the length of the automatic return spring 7, which makes it convenient for the user to observe the status of the automatic return spring 7, so as to promptly discover and deal with possible problems.

[0048] 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. Automatic reset ball spline, characterized by: It comprises a shaft (1) and a sleeve (2); The shaft (1) is provided with a ball rolling track (3) on its exterior, and the inner wall of the outer sleeve (2) is provided with an inner rolling track (4) that cooperates with the ball rolling track (3); The outer sleeve (2) is provided with an isolation structure corresponding to the ball; The outer sleeve (2) is provided with an axis retaining spring (6) corresponding to the shaft rod (1), and the outer sleeve (2) is also provided with a fixed retaining spring (8) corresponding to the axis retaining spring (6), and the outer sleeve (2) is also provided with an automatic return spring (7) corresponding to the fixed retaining spring (8) and the axis retaining spring (6).

2. The automatic reset ball spline according to claim 1, characterized in that: The isolation structure comprises an inner ball isolation sleeve (5) that cooperates with multiple groups of balls, and the ball isolation sleeve (5) is sleeved on the shaft (1).

3. The automatic reset ball spline according to claim 1, characterized in that: The inner wall of the outer sleeve (2) is tightly fitted with the outer wall of the inner ball isolation sleeve (5).

4. The automatic reset ball spline according to claim 1, characterized in that: The shaft retaining spring (6) is fixedly connected to the outer wall of the shaft rod (1), the fixed retaining spring (8) is connected to the outer sleeve (2), and the fixed retaining spring (8) is slidably connected to the shaft rod (1).

5. The automatic reset ball spline according to claim 1, characterized in that: The outer walls of the shaft retaining spring (6) and the fixed retaining spring (8) are both in contact with the inner wall of the outer sleeve (2).

6. The automatic reset ball spline according to claim 1, characterized in that: One end of the automatic return spring (7) is connected to the shaft retaining spring (6), and the other end is connected to the fixed retaining spring (8).

7. The automatic reset ball spline according to claim 1, characterized in that: The diameter of the automatic return spring (7) is smaller than the inner diameter of the outer sleeve (2), and the automatic return spring (7) is sleeved on the shaft (1).

8. The automatic reset ball spline according to claim 1, characterized in that: The shaft retaining spring (6) and the fixed retaining spring (8) are made of high-strength metal material.

9. The automatic reset ball spline according to claim 1, characterized in that: An air inlet (9) is provided on the shaft (1), and the air inlet (9) is connected to an external air source.

10. The automatic reset ball spline according to claim 1, characterized in that: An observation window is provided on the outer wall of the outer sleeve (2) at the same position as the automatic return spring (7), and the length of the observation window is greater than the length of the automatic return spring (7).

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