High-precision ball screw

Abstract

The utility model discloses a high-precision ball screw which comprises a screw body provided with a threaded groove, a nut ring and an installation disc connected with one end of the nut ring. A reinforcing ring is arranged on the outer side of the nut ring, and an oil inlet is formed in the reinforcing ring in a penetrating mode. A cavity is formed in the nut ring, and a plurality of oil inlet channels extending out of the nut ring are arranged at the upper end of the cavity. A plurality of arc-shaped grooves are formed in the positions, close to the upper end and the lower end, of the inner side of the nut ring. The arc-shaped grooves close to the upper ends communicate with second oil inlet channels, and the upper ends of the second oil inlet channels communicate with the cavity. Sealing rings are arranged on the inner sides of the two ends of the lead screw, and dedusting structures are arranged on the inner sides of the sealing rings. The balls are placed separately, so that abrasion among the balls during mutual contact is avoided; a lubricating oil channel is arranged, and abrasion increase caused by impurities on the lead screw can be avoided; the whole structure can prevent the nut from shaking, and the operation precision is prevented from being affected.

Description

Technical Field

[0001] The utility model relates to the technical field of screw rods, in particular to a high-precision ball screw rod. Background Art

[0002] Ball screws are ideal products for converting rotary motion into linear motion, or converting linear motion into rotary motion. They are the most commonly used transmission components in tool machinery and precision machinery. Their main function is to convert rotary motion into linear motion, or torque into axial repetitive force. Ball screws are widely used in various industrial equipment and precision instruments.

[0003] In actual applications, the screw and nut will wear out under long-term friction, which will increase the gap between the screw, ball and nut, and the nut will shake slightly, affecting the overall operating accuracy. However, due to the small operating space and the fact that the entire machine is made of metal, friction is inevitable and difficult to maintain.

[0004] In addition, in the prior art, the balls are closely arranged and roll around one or two circles of threads on the outside of the screw, thereby causing the nut to reciprocate on the screw. This causes the balls to rub against the screw and the nut as well as themselves, causing further wear, leaving room for improvement. In addition to this, in order not to affect the normal rotation of the nut, the nut is not fully enclosed, so debris and impurities on the outside of the screw may enter the inside of the nut, causing wear on the balls. The above problems all need to be improved. Utility Model Content

[0005] The utility model aims to solve the technical problem that the screw rod and the nut are easy to wear under long-term friction, which affects the operation accuracy, and provides a high-precision ball screw rod.

[0006] In order to solve the above technical problems, the technical solution provided by the utility model is: a high-precision ball screw, comprising a screw with a threaded groove, a nut ring and a mounting plate connected to one end of the nut ring; a reinforcement ring is provided on the outside of the nut ring, an oil inlet is penetrated through the reinforcement ring, and a protective cover is threadedly connected to the outside of the oil inlet; a cavity is provided inside the nut ring, and a plurality of oil inlet channels extending from the nut ring are provided at the upper end of the cavity; a plurality of arc grooves are provided on the inner side of the nut ring and near the upper and lower ends, and balls are rotatably provided in the arc grooves, and the balls are rotatably connected to the threaded grooves at the corresponding positions on the screw; the arc grooves near the upper end are connected to a second oil inlet channel, and the upper ends of the second oil inlet channels are connected to the cavity; sealing rings are provided on the inner sides of both ends of the nut ring, and a dust removal structure is provided on the inner side of the sealing ring.

[0007] Preferably, a plurality of mounting holes are provided on the circumference of the mounting plate, and the distance between the corresponding mounting holes is greater than the outer diameter of the reinforcement ring; and mounting rods are provided at both ends of the screw rod.

[0008] Preferably, the reinforcement ring is in the shape of a hollow cylinder, and both ends of the reinforcement ring are fixedly connected to the nut ring.

[0009] Preferably, a threaded neck is provided on the outer side of the oil inlet, and a thread that can be threadedly connected to the threaded neck is provided on the inner side of the protective cover.

[0010] Preferably, the inner bottom surface of the cavity is funnel-shaped.

[0011] Preferably, the dust removal structure includes bristles arranged along the circumference of the inner side of the sealing ring, and the arrangement direction of the bristles is consistent with the direction of the thread groove of the screw rod.

[0012] The advantages of the utility model compared with the prior art are:

[0013] 1. The balls are placed separately to avoid wear between the balls when they come into contact with each other; arc grooves are used to limit the balls so that they can only rotate at fixed positions, which does not affect the transmission of the nut and can also reduce the friction between the balls. The reduced wear of the balls can prevent the nuts from loosening and affect the operation accuracy;

[0014] 2. A lubricating oil channel is provided, and the amount of lubricating oil falling on the screw can be controlled, so as to avoid a large amount of lubricating oil being directly applied to the screw on the basis of being able to lubricate the ball and reduce friction. The lubricating oil absorbs dust and will increase wear;

[0015] 3. Brushes that match the thread grooves of the screw are set inside the sealing ring, which can clean the dust on the screw in advance when the nut moves, avoid increased wear due to impurities, and further ensure the operating accuracy of the screw and nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a cross-sectional view of the utility model.

[0018] Figure 3 It is a structural schematic diagram of the nut ring and the reinforcement ring of the utility model.

[0019] Figure 4 It is a cross-sectional view of the reinforcing ring of the utility model.

[0020] Figure 5 This utility model Figure 2 Enlarged view of point A in the middle.

[0021] As shown in the figure: 1. Screw, 2. Nut ring, 3. Mounting plate, 4. Mounting hole, 5. Mounting rod, 6. Reinforcement ring, 7. Oil inlet, 8. Protective cover, 9. Cavity, 10. Oil inlet channel, 11. Arc groove, 12. Ball, 13. Oil inlet channel 2, 14. Sealing ring, 15. Brush. DETAILED DESCRIPTION

[0022] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0023] Embodiment 1, in combination with the attached Figure 1-5 A high-precision ball screw comprises a screw 1 with a threaded groove, a nut ring 2 and a mounting plate 3 connected to one end of the nut ring 2; a plurality of mounting holes 4 are arranged on the circumference of the mounting plate 3, and the distance between the corresponding mounting holes 4 is greater than the outer diameter of the reinforcement ring 6; mounting rods 5 are arranged at both ends of the screw 1, and the screw 1 is installed on the corresponding equipment through the mounting rods 5, or the mounting plate 3 is installed on the corresponding equipment through the mounting holes 4.

[0024] Combined with Figure 1 , 2 4. A reinforcement ring 6 is provided on the outside of the nut ring 2. The reinforcement ring 6 is hollow cylindrical. Both ends of the reinforcement ring 6 are fixedly connected to the nut ring 2. The reinforcement ring 6 can support and reinforce the nut ring 2. Since a cavity is provided inside the nut ring 2, the structural strength will be reduced accordingly, and a reinforcement structure is required on the outside for support. In addition, the reinforcement ring 6 can temporarily store the added lubricating oil to prevent it from flowing directly onto the screw rod and absorbing dust. An oil inlet 7 is pierced on the reinforcement ring 6. A protective cover 8 is threadedly connected to the outside of the oil inlet 7. A threaded neck is provided on the outside of the oil inlet 7. A thread that can be threadedly connected to the threaded neck is provided on the inside of the protective cover 8. The threaded connection is not easy to disengage, so it can be prevented from falling off due to high-speed rotation during use.

[0025] Combined with Figure 2 , 5A cavity 9 is provided inside the nut ring 2, and a plurality of oil inlet channels 10 extending from the nut ring 2 are provided at the upper end of the cavity 9, and the lubricating oil in the reinforcing ring 6 is introduced into the cavity 9 through the oil inlet channels 10; a plurality of arc grooves 11 are provided inside the nut ring 2 and near the upper and lower ends, and balls 12 are rotatably provided in the arc grooves 11, and the balls 12 are rotatably connected to the threaded grooves at the corresponding positions on the screw rod 1, so that the rotation and linear movement of the nut ring 2 on the outer side of the screw rod 1 can be realized through the rotation of the balls 12, and the arc grooves 11 can limit the position of the balls 12 without affecting them, so as to prevent them from moving and preventing the balls 12 from moving and contacting each other after displacement The proximity causes friction; the arc grooves 11 near the upper end are all connected to an oil inlet channel 2 13, and the upper ends of the oil inlet channels 2 13 are connected to the cavity 9, and the bottom surface of the cavity 9 is funnel-shaped; the lubricating oil in the cavity 9 is introduced into part of the arc grooves 11 through the oil inlet channel 2 13, so that the balls 12 in this part of the arc grooves 11 can contact the lubricating oil, and transmit it to the corresponding threaded groove on the outside of the screw rod 1 through its own rotation, and then transmit the lubricating oil to another ball 12 through transmission again, which not only completes lubrication, but also avoids excessive adhesion of lubricating oil to the screw rod, causing dust absorption, and increasing the wear of the nut ring 2 and the ball 12 during operation.

[0026] Embodiment 2, combined with the attached Figure 3 A sealing ring 14 is provided on the inner side of both ends of the nut ring 2, and a dust removal structure is provided on the inner side of the sealing ring 14; the dust removal structure includes bristles 15 provided along the inner side of the sealing ring 14, and the arrangement direction of the bristles 15 is consistent with the direction of the thread groove of the screw rod 1. Therefore, when the nut ring 2 moves, the bristles 15 can remove impurities in the thread groove in front to prevent them from entering the nut ring 2 and contacting the ball 12 to cause further wear.

[0027] The working principle of the utility model is as follows: when in use, the balls 12 rotate in the arc groove 11 and the threaded groove outside the screw rod 1, so that the nut ring 2 can reciprocate on the screw rod 1. Since the balls 12 are staggered and do not contact each other, the wear caused by the extrusion and friction between the balls 12 can be avoided, and the operation accuracy can be avoided;

[0028] Lubricating oil is injected through the oil inlet 7. The lubricating oil first enters the space between the reinforcement ring 6 and the nut ring 2. During the rotation of the nut ring 2, the lubricating oil enters the cavity 9 through the oil inlet channel 10, and then enters the arc groove 11 through the oil inlet channel 2 13 to lubricate the ball 12, and then is transmitted to another part of the ball 12 through the screw 1. The above structure can not only ensure the lubrication of the ball 12 and reduce wear, but also avoid a large amount of lubricating oil being directly introduced into the screw 1, causing the screw 1 to absorb dust and aggravate wear; the bristles 15 in the sealing ring 14 also play this role, removing dust on the screw 1, reducing the friction of the ball 12, and ensuring operation accuracy.

[0029] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A high-precision ball screw, comprising a screw (1) with a thread groove, a nut ring (2), and a mounting plate (3) connected to one end of the nut ring (2); characterized in that: A reinforcement ring (6) is provided on the outside of the nut ring (2), an oil inlet (7) is provided on the reinforcement ring (6), and a protective cover (8) is threadedly connected to the outside of the oil inlet (7); a cavity (9) is provided inside the nut ring (2), and a plurality of oil inlet channels (10) extending out of the nut ring (2) are provided at the upper end of the cavity (9); a plurality of arc grooves (11) are provided on the inside of the nut ring (2) and near the upper and lower ends, and balls (12) are rotatably provided in the arc grooves (11), and the balls (12) are rotatably connected to the threaded grooves at corresponding positions on the screw rod (1); the arc grooves (11) near the upper end are connected to oil inlet channels 2 (13), and the upper ends of the oil inlet channels 2 (13) are connected to the cavity (9); sealing rings (14) are provided on the inner sides of both ends of the nut ring (2), and a dust removal structure is provided on the inner side of the sealing ring (14).

2. A high-precision ball screw according to claim 1, characterized in that: A plurality of mounting holes (4) are arranged on the circumference of the mounting plate (3), and the distance between the corresponding mounting holes (4) is greater than the outer diameter of the reinforcing ring (6); and mounting rods (5) are arranged at both ends of the screw rod (1).

3. A high-precision ball screw according to claim 1, characterized in that: The reinforcement ring (6) is in the shape of a hollow cylinder, and both ends of the reinforcement ring (6) are fixedly connected to the nut ring (2).

4. A high-precision ball screw according to claim 1, characterized in that: The outer side of the oil inlet (7) is provided with a threaded neck, and the inner side of the protective cover (8) is provided with a thread that can be threadedly connected to the threaded neck.

5. The high-precision ball screw according to claim 1, characterized in that: The inner bottom surface of the cavity (9) is funnel-shaped.

6. The high-precision ball screw according to claim 1, characterized in that: The dust removal structure comprises bristles (15) arranged along the circumference of the inner side of the sealing ring (14), and the arrangement direction of the bristles (15) is consistent with the direction of the thread groove of the screw rod (1).

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