ball screw

Abstract

Ball screw, characterized in that it comprises a spindle, a main nut, an auxiliary nut, deflection devices and an adjusting nut; the spindle is successively provided with main ball grooves, self-locking grooves and auxiliary ball grooves on which a main nut and an auxiliary nut are mounted, which interact with it; the inner ring of the main nut is successively provided with a main nut ball groove, self-locking main nut grooves and main nut return holes; the inner ring of the auxiliary nut is successively provided with an auxiliary nut ball groove, self-locking auxiliary nut grooves and auxiliary nut return holes; the main nut and the auxiliary nut are provided with deflection devices on the upper and lower sides, and the deflection devices interact with the main nut return holes and the auxiliary nut return holes to form closed ball circuits;The outer rings of the main nut and the auxiliary nut are provided with an adjusting nut that rotates with them.

Description

Technical area

[0001] The present invention relates to the technical field of ball screws and, in particular, relates to a ball screw. State of the art

[0002] There are mainly two types of screws used for power transmission on the market today: ball screws and acme screws. Ball screws are widely used in various precision structures due to their high running speed, high position repeatability, low friction, low noise, and other advantages. However, the axial force of the ball screw is low, making it unsuitable for vertical installation and locations with high axial force.

[0003] The trapezoidal screw has a simple structure and a large axial force, making it suitable for heavy and extremely heavy loads, especially for vertical installation or locations with large axial forces. However, the position repeatability of the trapezoidal screw is not high, friction is high, the transmission speed is slow, and it cannot be used for high-precision mechanisms.

[0004] Considering the above problems, this application provides a ball screw with large axial load, suitable for vertical installation and is safe and reliable. Content of the invention

[0005] In order to solve the above technical deficiencies, a ball screw is developed in which the angle between the conventional ball groove surface and the axial direction is changed to improve the axial force of the ball screw and solve the technical problem that the existing ball screw is not suitable for vertical installation and locations with large axial force.

[0006] The technical solution provided by the present invention is: a ball screw comprising a screw, a main nut, an auxiliary nut, deflectors, and an adjusting nut; the screw is provided with main ball grooves, self-locking grooves, and auxiliary ball grooves, on which a main nut and an auxiliary nut are mounted and cooperate with it; the inner ring of the main nut is provided with a main nut ball groove, self-locking main nut grooves, and main nut return holes, in sequence; the inner ring of the auxiliary nut is provided with an auxiliary nut ball groove, self-locking auxiliary nut grooves, and auxiliary nut return holes, in sequence; the main nut and the auxiliary nut are provided with deflectors on the top and bottom surfaces, and the deflectors cooperate with the main nut return holes and the auxiliary nut return holes to form closed ball circuits;The outer rings of the main nut and the auxiliary nut are provided with an adjusting nut that rotatably cooperates with them. The main ball grooves are distributed axially upwards, the groove surfaces of the self-locking grooves are at an acute angle to the axial direction. The auxiliary ball grooves are distributed axially downwards, with the self-locking grooves located between the main ball grooves and the auxiliary ball grooves and arranged at an acute angle to the axial direction.

[0007] The main nut ball groove and the main ball groove fit together by balls in a rolling manner, the self-locking main nut groove and the self-locking groove fit together in a rotating manner, and the main nut return hole is formed into a closed circuit by the deflection devices arranged at the upper and lower ends of the main nut.

[0008] The auxiliary nut ball groove and the auxiliary ball groove fit together by balls in a rolling manner, the self-locking auxiliary nut groove and the self-locking groove fit together in a rotating manner, and the auxiliary nut return hole is formed into a closed circuit by the deflection devices arranged at the upper and lower ends of the auxiliary nut. Short description of the drawings Fig. 1 is a schematic diagram of the structure of a ball screw of the present invention. Fig. 2 is a schematic diagram of the structure of a screw of a ball screw of the present invention. Fig. 3 is a schematic diagram of the structure of a main nut of a ball screw of the present invention. Fig. 4 is a schematic diagram of the structure of an auxiliary nut of a ball screw of the present invention. Fig. 5 is a schematic diagram of the structure of a ball screw deflection device of the present invention. Detailed description of the preferred embodiments

[0009] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described clearly and completely below in conjunction with the accompanying drawings.

[0010] With reference to the Fig. 1 to 5, a ball screw comprises a spindle 1, a main nut 2, an auxiliary nut 3, deflection devices 4 and an adjusting nut 5.

[0011] The spindle 1 is provided with main ball grooves 1.1, self-locking grooves 1.2, and auxiliary ball grooves 1.3 in sequence. The groove surface of the main ball groove 1.1 of the spindle 1 is directed axially upward, and the auxiliary ball groove 1.3 of the spindle 1 is directed axially downward. That is, the groove surface of the main ball groove 1.1 and the groove surface of the auxiliary ball groove 1.3 are both arranged in a transverse direction, which are rotated by a 90-degree angle compared to the groove surface of existing ball screws, and the balls roll freely on the groove surface. The axially distributed groove surface maximizes the axial force of the ball screw.

[0012] The self-locking groove 1.2 of the spindle 1 is arranged at a smaller angle to the axial direction, so that in the event of ball failure, the groove surface of the self-locking groove 1.2 contacts the nut and forms a self-locking feature. Compared to the conventional self-locking method of spindles or screws, it is rotated by 90°.

[0013] The inner ring of the main nut 2 is successively provided with a main nut ball groove 2.1, self-locking main nut grooves 2.2, and main nut return holes 2.3, and its upper and lower surfaces are provided with deflection devices 4. The groove surface of the main nut ball groove 2.1 is axially distributed and directed downward, corresponding to the groove surface of the main ball groove 1.1 of the spindle 1, and the balls are held in the center thereof to form a rolling interaction. The groove surface of the self-locking main nut groove 2.2 is arranged corresponding to the self-locking groove 1.2 of the spindle 1.

[0014] The number of main nut return holes 2.3 is provided according to the number of screw threads (the number of main nut return holes 2.3 is arranged and evenly distributed according to the number of screw threads for a ball screw with two threads). These holes cooperate with the deflection devices 4 provided above and below to form closed circuits, so that the balls roll out of the main nut 2 and the main ball groove 1.1 of the screw 1 and then return through the deflection device 4 and the main nut return hole 2.3, thus forming a closed circuit. The deflection device 4 is provided with guide grooves 4.1 that cooperate with the main nut 2.

[0015] The inner ring of the auxiliary nut 3 is successively provided with an auxiliary nut ball groove 3.1, self-locking auxiliary nut grooves 3.2, and auxiliary nut return holes 3.3, and its upper and lower surfaces are provided with deflection devices 4. The groove surface of the auxiliary nut ball groove 3.1 is axially distributed and directed upwards, corresponding to the groove surface of the auxiliary ball groove 1.3 of the spindle 1, and the balls are held in the center thereof to form a rolling interaction. The groove surface of the self-locking auxiliary nut groove 3.2 is arranged corresponding to the self-locking groove 1.2 of the spindle 1.

[0016] The number of auxiliary nut return holes 3.3 is provided according to the number of screw threads (the number of auxiliary nut return holes 3.3 is arranged and evenly distributed according to the number of screw threads in a ball screw with two threads). These holes cooperate with the deflection devices 4 provided above and below to form closed circuits. The balls roll out of the auxiliary nut 3 and the auxiliary ball groove 1.3 of the screw 1 and then return through the deflection device 4 and the auxiliary nut return hole 3.3, thus forming a closed circuit. The deflection device 4 is provided with guide grooves 4.1 that cooperate with the auxiliary nut 3.

[0017] The outer rings of the main nut 2 and the auxiliary nut 3 are provided with an adjusting nut 5 which rotatably cooperates with them, wherein the inner ring of the adjusting nut 5 is rotatably connected to the outer rings of the main nut 2 and the auxiliary nut 3 and adjusts the distance between the main nut 2 and the auxiliary nut 3 by rotation.

[0018] If the application requires that the axial force acts in a single direction, the auxiliary nut 3 and the adjusting nut 5 can be omitted, resulting in a larger axial force in a single direction. At the same time, the ball screw in this application can adjust the strength of the ball screw through the adjusting nut 5, so that the precision of the ball screw is maintained at a high level of technical effect. When the ball screw is used as an ordinary ball screw, the self-locking grooves 1.2 of the screw 1 and the self-locking main nut grooves 2.2 on the main nut 2, as well as the self-locking auxiliary nut grooves 3.2 on the auxiliary nut 3, can be omitted to reduce production costs.

Claims

[1] Ball screw, characterized bythat it comprises a spindle, a main nut, an auxiliary nut, deflectors and an adjusting nut; the spindle is provided in sequence with main ball grooves, self-locking grooves and auxiliary ball grooves, on which a main nut and an auxiliary nut are mounted and cooperate with it; the inner ring of the main nut is provided in sequence with a main nut ball groove, self-locking main nut grooves and main nut return holes; the inner ring of the auxiliary nut is provided in sequence with an auxiliary nut ball groove, self-locking auxiliary nut grooves and auxiliary nut return holes; the main nut and the auxiliary nut are provided with deflectors on the top and bottom surfaces, and the deflectors cooperate with the main nut return holes and the auxiliary nut return holes to form closed ball circuits;the outer rings of the main nut and the auxiliary nut are provided with an adjusting nut which cooperates with them in rotation; [2] Ball screw according to claim 1, characterized by that the main ball grooves are distributed axially upwards, the groove surfaces of the self-locking grooves are at an acute angle to the axial direction, the auxiliary ball grooves are distributed axially downwards, wherein the self-locking grooves are arranged between the main ball grooves and the auxiliary ball grooves and are arranged at an acute angle to the axial direction. [3] Ball screw according to claim 2, characterized bythat the main nut ball groove and the main ball groove fit together by balls in a rolling manner, the self-locking main nut groove and the self-locking groove fit together in a rotating manner, and the main nut return hole is formed into a closed circuit by the deflection devices arranged at the upper and lower ends of the main nut; the auxiliary nut ball groove and the auxiliary ball groove fit together by balls in a rolling manner, the self-locking auxiliary nut groove and the self-locking groove fit together in a rotating manner, and the auxiliary nut return hole is formed into a closed circuit by the deflection devices arranged at the upper and lower ends of the auxiliary nut. [4] Ball screw according to claim 3, characterized by that the number of main nut return holes and the number of auxiliary nut return holes are provided according to the number of spindle threads; the deflection device has the shape of a circle, one side of which is provided with guide grooves which cooperate with the main nut and the auxiliary nut, the guide grooves being arranged corresponding to the spindle threads which serve to cooperate with the main nut return holes and the auxiliary nut return holes to form closed circuits. [5] Ball screw according to claim 1, characterized by that the inner ring of the adjusting nut is rotatably connected to the main nut and the auxiliary nut and adjusts the distance between the main nut and the auxiliary nut by rotation.

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