Anti-loosening type lead screw nut structure

Abstract

The utility model discloses an anti-loosening type lead screw nut structure which comprises a lead screw, a gasket, a spacer bush, a bearing, a sealing ring and a motor base are respectively sleeved outside the lead screw, and an anti-loosening nut is further arranged on the lead screw. The locknut comprises a main nut, a locking sleeve and a locking nut, the main nut is locked on the lead screw, the locking sleeve is located on the side face of the main nut, the locking sleeve is of a conical structure, wire grooves are formed in the surface of the locking sleeve at equal intervals, external threads are arranged on the outer surface of the locking sleeve, the locking nut is in threaded connection with the external threads, and along with locking of the locking nut, the locking sleeve is in threaded connection with the external threads. And the locking sleeve is tightened and locked on the screw rod. By arranging the locknut, the locking nut can be effectively prevented from being loosened due to long-term back-and-forth movement of the lead screw, and the positioning accuracy and the dynamic response characteristic of a transmission system are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a screw rod technical field, concretely relates to a loosening type screw rod nut structure. BACKGROUND

[0002] The existing screw rod system adopts the double nut interlocking pre-tightening structure, and its assembly process is as follows: firstly, the screw rod bearing end is axially fixed, then the pre-tightening tension is applied through the locking nut outside the bearing seat, and the bidirectional constraint is formed by cooperating with the fastening nut inside the bearing seat. Although this structure can effectively realize the pre-tightening stretching function of the screw rod in the initial assembly stage, under the working condition of long-term bearing alternating load, the screw rod continuously performs high-frequency reciprocating motion, which causes the fretting wear between the screw threads, and the superposition effect of vibration impact, so that the pre-tightening force of the nut gradually decays, and then the problems such as the increase of the axial gap are caused, and finally the positioning accuracy and dynamic response characteristics of the transmission system are affected. SUMMARY

[0003] The utility model discloses to the defects and the insufficient of prior art, provide a loosening type screw rod nut structure.

[0004] In order to realize the above-mentioned purpose, the utility model adopts the technical scheme of a loosening type screw rod nut structure, which comprises a screw rod, the outer part of the screw rod is respectively sleeved with a gasket, a spacer, a bearing, a sealing ring and a motor seat, and the innovation point is that a locking nut is further arranged on the screw rod.

[0005] Further, the inner surface of the locking sleeve is provided with anti-skid lines.

[0006] Further, the locking nut is reversely locked and opposite to the rotation direction of the main nut.

[0007] After adopting the above structure, the utility model has the beneficial effects that:

[0008] The locking nut can be effectively prevented from loosening due to the long-term reciprocating motion of the screw rod by arranging the locking nut, and the positioning accuracy and dynamic response characteristics of the transmission system are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 The utility model is a structural schematic diagram.

[0010] BRIEF DESCRIPTION OF DRAWINGS

[0011] 1 screw rod, 2 gasket, 3 spacer, 4 bearing, 5 sealing ring, 6 motor base, 7 lock nut, 71 main nut, 72 locking sleeve, 73 locking nut, 74 wire slot. DETAILED DESCRIPTION

[0012] The utility model will be described further in connection with the drawings.

[0013] In order to make the utility model's purpose, technical scheme and advantage more clear and obvious, the following combines the drawings and specific embodiment, and the utility model is further detailed.The specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0014] Reference Figure 1 A lock nut structure of screw rod, including screw rod 1, the outer part of screw rod 1 is respectively connected gasket 2, spacer 3, bearing 4, sealing ring 5 and motor base 6, and lock nut 7 is also arranged on screw rod 1;Lock nut 7 includes main nut 71, locking sleeve 72 and locking nut 73, main nut 71 is locked on screw rod 1, locking sleeve 72 is located on the side of main nut 73, locking sleeve 72 is conical structure, and wire slot 74 is equidistantly arranged on the surface, the outer surface of locking sleeve 72 is provided with external thread, locking nut 73 is threadedly connected with the external thread, and locking sleeve 72 is tightened and locked on screw rod 1 along with the locking of locking nut 73.Specifically, main nut 71 is locked on screw rod 1, and then locking sleeve 72 is locked on screw rod 1 by locking nut 73, and the two cooperate with each other, which can effectively prevent the loosening of locking nut caused by the long-term reciprocating motion of screw rod, and ensure the positioning accuracy and dynamic response characteristics of transmission system.

[0015] In the embodiment, the inner surface of locking sleeve 72 is provided with anti-skid lines.The anti-skid lines can increase the friction with the screw rod, thereby assisting the anti-loosening effect of lock nut 7.

[0016] In the embodiment, locking nut 73 is reverse locking, and the rotating direction of locking nut 73 is opposite to that of main nut 71, and locking nut 73 is tightened more and more during rotation due to the reverse locking, thereby playing the anti-loosening role.

[0017] The above is only used to explain the technical scheme of the utility model, not limit, and other modifications or equivalent replacements of the technical scheme of the utility model made by the ordinary skill in the art should be covered in the scope of the claims of the utility model.

Claims

1. A type of anti-loosening screw nut structure, comprising a screw, wherein a washer, a spacer, a bearing, a sealing ring, and a motor base are respectively sleeved on the outside of the screw, characterized in that: The lead screw is also provided with an anti-loosening nut; the anti-loosening nut includes a main nut, a locking sleeve and a locking nut. The main nut is locked onto the lead screw. The locking sleeve is located on the side of the main nut. The locking sleeve has a conical structure and grooves are equally spaced on its surface. The locking sleeve has an external thread. The locking nut is threaded to the external thread. As the locking nut is tightened, the locking sleeve is tightened and locked onto the lead screw.

2. The anti-loosening screw nut structure according to claim 1, characterized in that: The inner surface of the locking sleeve is provided with anti-slip texture.

3. The anti-loosening screw nut structure according to claim 1, characterized in that: The locking nut is a reverse locking nut, which rotates in the opposite direction to the main nut.

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