Ball screw pair structure capable of improving positioning precision

Abstract

The utility model relates to the technical field of ball screw pair structures, in particular to a ball screw pair structure capable of improving positioning accuracy, which comprises a motor, a screw main body is fixedly mounted at the power output end of the motor, a sliding block is slidably connected to the outer wall of the screw main body, a ball is rotatably connected into the sliding block, and the ball is fixedly connected with the screw main body. The outer wall of the sliding block is sleeved with a fixing shell, an assembling shell is fixedly installed at the top end of the fixing shell, and a lubricating mechanism is arranged in the assembling shell. By means of the pushing frame and the pushing plate and the cooperation of the first spring and the second spring, when the sliding block resets, the second sponge block is extruded, lubricating oil enters the positions of the balls through the circulation grooves to achieve the lubricating effect, friction force increase and heat accumulation can be avoided, the rolling track of the balls becomes irregular, and the service life of the balls is prolonged. And even the surface smoothness is damaged due to excessive friction, so that the positioning and transmission precision is influenced.

Description

Technical Field

[0001] This utility model relates to the technical field of ball screw pair structure, and in particular to a ball screw pair structure that can improve positioning accuracy. Background Technology

[0002] A ball screw assembly is a mechanical transmission device consisting of a screw, nut, reversing device, and balls. It is used to convert rotary motion into linear motion or vice versa. It is widely used in various precision machinery and automated equipment, and is widely applied in the feed system of CNC machine tools to realize the precise linear motion of components such as the worktable and tool post, ensuring the dimensional accuracy and surface quality of machined parts.

[0003] In existing technologies, ball screw assemblies are assembled using a support plate to support the screw, and a bearing is installed on the support plate to support one end of the screw. Currently, the support plate has slots for placing the bearing. During operation, the screw itself will vibrate, and the support plate only positions the bearing through the slots, resulting in a small contact area between the bearing and the support plate. This causes the bearing to vibrate synchronously with the screw during operation, making it impossible to guarantee the stability of the screw within the slot. When the bearing vibrates, it will rub and collide with the support plate, which will affect the positioning accuracy of the nut when the screw moves.

[0004] An existing patent (publication number: CN222351333U) discloses a ball screw pair structure that can improve positioning accuracy. This utility model uses a motor to drive two racks to pull a slider when they move in opposite directions, and the slider to pull a connecting rod when it moves in opposite directions. The position difference generated when the connecting rod deflects can pull the pressure plate in opposite directions, so that the pressure plate drives the moving rod to slide in the sleeve, thereby enabling the bearing to be quickly positioned in the support.

[0005] To address the aforementioned issues, while existing patents offer solutions that can quickly achieve positioning through the cooperation of components such as racks and pinions, in actual use, ball screw pairs rely on the rolling of balls to achieve high-precision transmission. When lubrication is lacking, the friction of the balls increases sharply, leading to uneven ball movement, sliding friction, reduced transmission efficiency, and inability to achieve precise micro-feeding, thus affecting positioning accuracy. Summary of the Invention

[0006] The purpose of this invention is to provide a ball screw pair structure that can improve positioning accuracy, thereby avoiding increased friction and heat accumulation, which would cause the rolling trajectory of the balls to become irregular, affecting the stability of the movement, or even causing excessive friction to damage the surface finish, thus affecting positioning and transmission accuracy, in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a ball screw pair structure that can improve positioning accuracy, including a motor, a screw body fixedly installed at the power output end of the motor, a sliding block slidably connected to the outer wall of the screw body, a ball rotatably connected inside the sliding block, a fixed shell sleeved on the outer wall of the sliding block, an assembly shell fixedly installed at the top of the fixed shell, and a lubrication mechanism provided inside the assembly shell;

[0008] The lubrication mechanism includes a mounting groove, which is formed on the outer wall of the assembly shell. A first spring is embedded in one side of the inner side of the assembly shell. A pusher is fixedly installed at one end of the first spring. A fixing rod is fixedly installed at the end of the motor facing the sliding block, and an abutment block is fixedly installed at the end of the fixing rod away from the motor.

[0009] Preferably, a first sponge block is embedded inside the pusher frame, and a second sponge block is fixedly installed at the front end of the first sponge block.

[0010] Preferably, a second spring is embedded on the other side of the interior of the assembly shell, and a push plate is fixedly installed on one end of the second spring.

[0011] Preferably, a rubber pad is fixedly installed on the outer wall of the push plate, and a flow groove is provided at the bottom of the inner side of the assembly shell.

[0012] Preferably, the first sponge block has a placement hole inside, and the placement hole is provided with an abutment mechanism.

[0013] Preferably, the abutting mechanism includes an abutting rod, which penetrates into the interior of the mounting hole, and a sleeve rod is fitted around the end of the abutting rod that penetrates into the mounting hole.

[0014] Preferably, a limit ring is fixedly installed on the outer wall of one end of the abutment rod that passes through the sleeve rod, and a strong spring is fixedly installed between the abutment rod and the sleeve rod.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model uses a pusher and a pusher plate, along with a first spring and a second spring, to compress the second sponge block when the sliding block is reset. This allows lubricating oil to enter the position of the ball through the flow groove, thus achieving a lubricating effect. This can prevent increased friction and heat accumulation, which would otherwise cause the rolling trajectory of the ball to become irregular, affecting the stability of the movement, or even causing excessive friction that damages the surface finish, thereby affecting the positioning and transmission accuracy.

[0017] 2. By aligning the second sponge block with the flow groove and squeezing it, the lubricating oil soaked in the second sponge block can flow directly out through the flow groove, ensuring that the lubricating oil can make full contact with the balls and avoiding insufficient lubricating oil affecting the lubrication effect, thus still failing to solve the problem of excessive friction. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is an overall structural view of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the assembly shell of this utility model;

[0021] Figure 3 For the present utility model Figure 2 Enlarged view of A in the middle;

[0022] Figure 4 This is a schematic diagram of the first sponge block structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the sleeve rod structure of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Motor; 2. Lead screw body; 3. Sliding block; 4. Ball bearing; 5. Fixed shell; 6. Assembly shell; 7. Lubrication mechanism; 701. Resettling groove; 702. First spring; 703. Pushing frame; 704. Fixed rod; 705. Abutting block; 706. First sponge block; 707. Second sponge block; 708. Second spring; 709. Push plate; 710. Rubber pad; 711. Flow groove; 8. Resettling hole; 9. Abutting mechanism; 901. Abutting rod; 902. Sleeve rod; 903. Limiting ring; 904. Strong spring. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] This utility model provides a technical solution:

[0028] Please see Figures 1 to 4 A ball screw assembly structure for improving positioning accuracy includes a motor 1. A screw body 2 is fixedly mounted on the power output end of the motor 1. A sliding block 3 is slidably connected to the outer wall of the screw body 2. A ball 4 is rotatably connected inside the sliding block 3. A fixed shell 5 is sleeved on the outer wall of the sliding block 3. An assembly shell 6 is fixedly mounted on the top of the fixed shell 5. A lubrication mechanism 7 is provided inside the assembly shell 6. The lubrication mechanism 7 includes a mounting groove 701, which is formed on the outer wall of the assembly shell 6. A first spring 702 is embedded in one side of the interior of the assembly shell 6. One end of the first spring 702 is fixed... A pusher frame 703 is fixedly installed. A fixing rod 704 is fixedly installed at the end of the motor 1 facing the sliding block 3. An abutment block 705 is fixedly installed at the end of the fixing rod 704 away from the motor 1. A first sponge block 706 is embedded inside the pusher frame 703. A second sponge block 707 is fixedly installed at the front end of the first sponge block 706. A second spring 708 is embedded on the other side of the inside of the assembly shell 6. A push plate 709 is fixedly installed at one end of the second spring 708. A rubber pad 710 is fixedly installed on the outer wall of the push plate 709. A flow groove 711 is opened at the bottom of the inside of the assembly shell 6.

[0029] By adopting the above technical solution, after the ball screw pair structure has finished running, it is reset by the drive of motor 1, which allows the contact block 705 at one end of the fixed rod 704 to be inserted into the placement groove 701. This allows the pusher 703 to stretch the first spring 702 and drive the first sponge block 706 to make the second sponge block 707 abut against the rubber pad 710. The elastic push of the second spring 708 causes the pusher plate 709 to abut against the rubber pad 710, which can squeeze the second sponge block 707. During the pushing process, the second spring 708 contracts, thus leaking out of the flow groove 711. The lubricating oil squeezed out by the second sponge block 707 drips into the ball 4 through the flow groove 711 to achieve a lubricating effect, avoiding the increase of friction which would cause the ball 4 to move unevenly. Over time, this would also cause wear on the ball 4, changing its size and shape, and further affecting the transmission accuracy and positioning accuracy. While sliding, the pusher 703 can also close the placement groove 701 to prevent lubricating oil leakage.

[0030] Specifically, such as Figure 4 and Figure 5As shown, the first sponge block 706 has a placement hole 8 inside, and a contact mechanism 9 is provided inside the placement hole 8. The contact mechanism 9 includes a contact rod 901, which passes through the placement hole 8. A sleeve rod 902 is sleeved on the outside of one end of the contact rod 901 that passes through the placement hole 8. A limit ring 903 is fixedly installed on the outer wall of the end of the contact rod 901 that passes through the sleeve rod 902. A strong spring 904 is fixedly installed between the contact rod 901 and the sleeve rod 902.

[0031] By adopting the above technical solution, when the second sponge block 707 is compressed, the second spring 708 is in a contracted state. Under the resistance of the abutment block 705, the pusher 703 continues to move, so that the abutment rod 901 abuts against the rubber pad 710. It is then contracted by the strong spring 904, allowing the abutment rod 901 to slide inside the sleeve rod 902 via the limiting ring 903 to prevent it from dislodging. At the same time, while the second sponge block 707 is being squeezed, it is positioned above the flow groove 711. Under the sealing of the rubber pad 710, the lubricating oil is prevented from being squeezed out and diffused. It can also penetrate into the flow groove 711, allowing a large amount of lubricating oil to enter accurately, maintaining full contact between the ball 4 and the lubricating oil, and achieving a lubrication effect.

[0032] Working principle: The ball screw body 2, sliding block 3, and ball bearings 4 form a conventional ball screw pair structure. The conventional technology will not be elaborated further. Driven by the motor 1, the sliding block 3 is fixed to the outer wall of the fixed shell 5, and the top of the mounting shell 6 is installed. When the sliding block 3 completes its displacement and resets, it moves closer to the motor 1, allowing the abutment block 705 at the front end of the fixed rod 704 to insert into the mounting groove 701. The inclined abutment block 705 abuts against the pusher 703, stretching the first spring 702, causing the second sponge block 707 at the front end of the first sponge block 706 to abut against the rubber pad 710 at the front end of the push plate 709. Subsequently, after elastic contraction by the second spring 708, the lubricating oil inside the compressed second sponge block 707 flows out and through the flow groove 711, immersing the ball bearings 4 in the mounting shell 6 for lubrication. When the sliding block 3 moves away from the motor 1, the abutment block 705 disengages from the mounting groove 701 and is then released by the first spring 708. 2. The elasticity of the second spring 708 allows the pusher frame 703 and the push plate 709 to return to their original positions. Lubricating oil is replenished through the oil injection hole at the front end of the assembly shell 6 via a syringe. The mounting hole 8 inside the second sponge block 707 is fitted with a sleeve rod 902. The sleeve rod 902 is pushed elastically by the strong spring 904 and can abut against the rubber pad 710 after the second sponge block 707 is squeezed. The strong spring 904 has a greater performance than the second spring 708, which can cause the second spring 708 to contract, so that the second sponge block 707 can also be at the top of the flow groove 711. Under the pressure of the inclined structure abutment block 705, the strong spring 904 contracts, causing the first sponge block 706 to contract, so that the lubricating oil can flow out of the flow groove 711, allowing as much lubricating oil as possible to enter the flow groove 711. The limiting ring 903 prevents the abutment rod 901 from falling off due to the push of the strong spring 904.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A ball screw pair structure that can improve positioning accuracy, comprising a motor (1), characterized in that: The power output end of the motor (1) is fixedly installed with a lead screw body (2), and a sliding block (3) is slidably connected to the outer wall of the lead screw body (2). A ball bearing (4) is rotatably connected inside the sliding block (3), and a fixed shell (5) is sleeved on the outer wall of the sliding block (3). An assembly shell (6) is fixedly installed at the top of the fixed shell (5), and a lubrication mechanism (7) is provided inside the assembly shell (6). The lubrication mechanism (7) includes a mounting groove (701), which is opened on the outer wall of the assembly shell (6). A first spring (702) is embedded in one side of the inner side of the assembly shell (6). A pusher (703) is fixedly installed at one end of the first spring (702). A fixing rod (704) is fixedly installed at one end of the motor (1) facing the sliding block (3), and an abutment block (705) is fixedly installed at one end of the fixing rod (704) away from the motor (1).

2. The ball screw pair structure for improving positioning accuracy according to claim 1, characterized in that: The pusher (703) has a first sponge block (706) embedded inside, and a second sponge block (707) is fixedly installed at the front end of the first sponge block (706).

3. The ball screw pair structure for improving positioning accuracy according to claim 1, characterized in that: A second spring (708) is embedded on the other side of the interior of the assembly shell (6), and a push plate (709) is fixedly installed on one end of the second spring (708).

4. The ball screw pair structure for improving positioning accuracy according to claim 3, characterized in that: A rubber pad (710) is fixedly installed on the outer wall of the push plate (709), and a flow groove (711) is opened at the bottom of the inner side of the assembly shell (6).

5. The ball screw pair structure for improving positioning accuracy according to claim 2, characterized in that: The first sponge block (706) has a mounting hole (8) inside, and a contact mechanism (9) is provided inside the mounting hole (8).

6. The ball screw pair structure for improving positioning accuracy according to claim 5, characterized in that: The abutting mechanism (9) includes an abutting rod (901), which is inserted into the interior of the mounting hole (8), and a sleeve rod (902) is sleeved on the outside of one end of the abutting rod (901) that is inserted into the mounting hole (8).

7. The ball screw pair structure for improving positioning accuracy according to claim 6, characterized in that: A limit ring (903) is fixedly installed on the outer wall of one end of the abutment rod (901) that passes through the sleeve rod (902), and a strong spring (904) is fixedly installed between the abutment rod (901) and the sleeve rod (902).

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