Nut rotation driving lead screw assembly

Abstract

The utility model discloses a nut rotation driving lead screw assembly which comprises a lead screw and a nut, the nut is rotatably arranged on the lead screw in a sleeved mode so as to drive the lead screw to move linearly through thread fit of the nut and the lead screw, and the nut is coaxially sleeved with a bearing outer ring. A plurality of bearing steel balls are arranged between the inner diameter face of the bearing outer ring and the outer diameter face of the nut in a rolling mode. According to the nut rotation driving lead screw assembly, through the arrangement of the bearing outer ring, the mode that the nut is connected with an external driving device and the bearing outer ring is connected with the supporting base can be achieved, the external driving device drives the nut to rotate, and then the lead screw is driven to be fed.

Description

Technical Field

[0001] The utility model relates to the technical field of ball screws for machine tools, in particular to a nut rotationally driving a screw assembly. Background Art

[0002] Ball screws are the most commonly used transmission elements in tool machinery and precision machinery. Their main function is to convert rotational motion into linear motion, or torque into axial repetitive force, while having the characteristics of high precision, reversibility and high efficiency. Due to their low friction resistance, ball screws are widely used in various industrial equipment and precision instruments. For high-precision machine tools, ball screws are very critical components that can effectively improve the positioning accuracy of machine tools.

[0003] The existing installation method of machine tool ball screws is to use bearings to support both ends of the screw shaft, and the driving device drives the screw shaft to rotate to drive the screw nut to feed. This is a relatively classic and commonly used installation method, but it cannot be applied in some specific situations. The existing installation method has complicated installation steps, the overall assembly occupies a large installation space, and the cost is relatively high; it is not conducive to normal work such as maintenance. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a nut rotationally driven screw assembly, which has the advantages of simple and compact structure, easy assembly, and high reliability compared to the existing ball screw transmission pair.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a nut rotationally driven screw assembly, comprising a screw and a nut, wherein the nut is rotatably sleeved on the screw to drive the screw to move linearly by cooperating with the thread of the screw, and wherein the nut is characterized in that a bearing outer ring is coaxially sleeved with the nut, and a plurality of bearing steel balls are rollably arranged between the inner diameter surface of the bearing outer ring and the outer diameter surface of the nut.

[0006] As a further improvement of the utility model, a retaining frame is provided between the outer diameter surface of the nut and the inner diameter surface of the outer ring of the bearing, and the retaining frame is sleeved on the bearing steel ball. Sealing rings are provided between the outer diameter surface of the nut and the inner diameter surface of the outer ring of the bearing at positions relative to the two ends of the retaining frame, so that the two ends of the space between the outer diameter surface of the nut and the inner diameter surface of the outer ring of the bearing are isolated and sealed from the outside world through the sealing rings.

[0007] As a further improvement of the present invention, the sealing ring includes a ring body, an abutment edge and a sealing edge. The abutment edge is fixed on the outer circumference of the ring body and is perpendicular to the ring body, and abuts against the inner diameter surface of the outer ring of the bearing. The sealing edge is fixed on the inner circumference of the ring body. The cross-section of the sealing edge is V-shaped, and the corner edges of the V-shape are fixedly connected to the ring body, and the divergent sides abut against the outer diameter surface of the nut.

[0008] As a further improvement of the utility model, the surface of the lead screw and the inner diameter surface of the nut are both provided with thread grooves, and the two thread grooves cooperate with each other to form a thread channel, and a feed steel ball is provided to roll in the thread channel.

[0009] The beneficial effect of the present invention is that, through the arrangement of the lead screw and the nut, a ball screw structure can be simply and effectively realized, and the feeding operation of the lead screw is realized by driving the nut to rotate through an external driving device, and through the arrangement of the outer ring of the bearing, an external support seat can be installed through the outer ring of the bearing to realize the rotation isolation between the support seat and the nut. Compared with the method of additionally arranging bearings at both ends of the lead screw in the prior art, the installation steps are simple, the overall installation space occupied by the assembly is small, and the cost is relatively low; it is conducive to the normal operation such as maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the overall structural diagram of the nut rotation driving screw assembly of the utility model;

[0011] Figure 2 for Figure 1 Enlarged view of part A in the middle. DETAILED DESCRIPTION

[0012] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0013] Reference Figures 1 to 2 As shown, a nut rotationally driven screw assembly of the present embodiment comprises a screw 1 and a nut 2, wherein the nut 2 is rotatably sleeved on the screw 1 to drive the screw 1 to move linearly by cooperating with the thread of the screw 1, and is characterized in that: the nut 2 is coaxially sleeved with a bearing outer ring 3, and a plurality of bearing steel balls 4 are rollably arranged between the inner diameter surface of the bearing outer ring 3 and the outer diameter surface of the nut 2. In the process of using the screw assembly of the present embodiment, it is only necessary to connect the nut 2 with an external driving device and the bearing outer ring 3 with a supporting seat, so that the nut 2 can be driven to rotate by the external driving device to achieve the purpose of driving the screw 1 to move laterally, and there is no need to additionally install bearings at both ends of the screw 1. Therefore, the driving screw assembly of the present embodiment has simple installation steps, the overall assembly occupies a small installation space, and the cost is relatively low; it is conducive to the normal operation such as maintenance.

[0014] As an improved specific implementation method, a retaining frame 5 is provided between the outer diameter surface of the nut 2 and the inner diameter surface of the bearing outer ring 3, and the retaining frame 5 is sleeved on the bearing steel ball 4. Sealing rings 6 are provided between the outer diameter surface of the nut 2 and the inner diameter surface of the bearing outer ring 3 at positions relative to the two ends of the retaining frame 5, so that the two ends of the space between the outer diameter surface of the nut 2 and the inner diameter surface of the bearing outer ring 3 are isolated and sealed from the outside world through the sealing ring 6. Through the arrangement of the retaining frame 5 and the sealing ring 6, the bearing outer ring 3 and the nut 2 can form a bearing structure, which well realizes the functions required by the bearing.

[0015] As an improved specific embodiment, the sealing ring 6 includes a ring body 61, an abutment edge 62 and a sealing edge 63. The abutment edge 62 is fixed on the outer circumference of the ring body 61 and is perpendicular to the ring body 61, and is in abutment with the inner diameter surface of the bearing outer ring 3. The sealing edge 63 is fixed on the inner circumference of the ring body 61. The cross-section of the sealing edge 63 is V-shaped, and the corner edges of the V-shape are fixedly connected to the ring body 61, and the diffused sides are abutted against the outer diameter surface of the nut 2. Through the arrangement of the above structure, the abutment edge 62 can be used to increase the contact surface with the bearing outer ring 3 to achieve a stable connection of the sealing ring 6, and then a better sealing characteristic can be achieved through the sealing edge 63.

[0016] As an improved specific implementation method, the surface of the screw 1 and the inner diameter surface of the nut 2 are both provided with thread grooves 7, and the two thread grooves 7 cooperate with each other to form a thread channel, in which a feed steel ball 8 is rolled. Through the arrangement of the thread grooves 7 and the steel balls 8, the feeding of the screw 1 can be simply and effectively achieved by the rolling of the balls 8 in the thread channel, thereby effectively reducing the friction between the nut 2 and the screw 1, and reducing the wear and driving resistance of the overall assembly.

[0017] To sum up, the nut rotation drives the screw assembly of the present embodiment, through the arrangement of the screw 1 and the nut 2, can effectively form a ball screw structure, and by coaxially sleeved with the bearing outer ring 3 on the nut 2, the external drive device can be connected to the nut 2, and the support seat can be connected to the bearing outer ring 3, so that the external drive device can drive the nut 2 to rotate, so as to achieve the purpose of driving the screw 1 to move laterally, and at the same time, there is no need to additionally coaxially install bearings at both ends of the screw 1 to connect with the support seat.

[0018] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A nut rotationally driven screw assembly, comprising a screw (1) and a nut (2), wherein the nut (2) is rotatably sleeved on the screw (1) to drive the screw (1) to move linearly by cooperating with the thread of the screw (1), characterized in that: The nut (2) is coaxially sleeved with a bearing outer ring (3), and a plurality of bearing steel balls (4) are rollably arranged between the inner diameter surface of the bearing outer ring (3) and the outer diameter surface of the nut (2); a retaining frame (5) is arranged between the outer diameter surface of the nut (2) and the inner diameter surface of the bearing outer ring (3), and the retaining frame (5) is sleeved on the bearing steel balls (4); sealing rings (6) are arranged between the outer diameter surface of the nut (2) and the inner diameter surface of the bearing outer ring (3) at positions relative to both ends of the retaining frame (5), so as to seal the outer diameter surface of the nut (2) with the bearing outer ring (3) through the sealing ring (6). The two ends of the space between the inner diameter surfaces of the bearing outer ring (3) are isolated and sealed from the outside; the sealing ring (6) includes a ring body (61), an abutting edge (62) and a sealing edge (63); the abutting edge (62) is fixed on the outer circumference of the ring body (61) and is perpendicular to the ring body (61) and abuts against the inner diameter surface of the bearing outer ring (3); the sealing edge (63) is fixed on the inner circumference of the ring body (61); the cross section of the sealing edge (63) is V-shaped, the corner edge of the V-shape is fixedly connected to the ring body (61), and the two diverging sides abut against the outer diameter surface of the nut (2).

2. The nut rotation driving screw assembly according to claim 1, characterized in that: The surface of the lead screw (1) and the inner diameter surface of the nut (2) are both provided with thread grooves (7), and the two thread grooves (7) cooperate with each other to form a thread channel, and a feed steel ball (8) is provided in the thread channel for rolling.

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