Lead screw bearing sealing structure used vertically

Abstract

The utility model relates to a lead screw bearing sealing structure used vertically, a bearing seat is sleeved on a lead screw, a polished shaft is arranged above the bearing seat on the lead screw, the bearing sealing structure comprises an oil sealing ring, the oil sealing ring is sleeved on the outer side of the polished shaft, and the oil sealing ring is fixed with the polished shaft in a sealing mode through a framework oil seal. The end face of the top of the bearing seat extends outwards in the axial direction to form an annular protrusion surrounding the optical axis, a groove allowing the annular protrusion to stretch into is formed in the end face of the bottom of the oil sealing ring, and the annular protrusion is arranged in the groove and forms labyrinth seal with the oil sealing ring. According to the lead screw bearing sealing structure, the oil sealing ring is installed on the optical axis above the bearing seat of the lead screw and matched with the protruding step on the bearing seat to form the labyrinth seal, when lead screw lubricating oil falls on the bearing seat under the action of gravity, the lead screw lubricating oil cannot enter the bearing seat, and therefore a bearing in the bearing seat is protected.

Description

Technical Field

[0001] This utility model relates to the field of lead screw sealing technology, and in particular to a lead screw bearing sealing structure for vertical use. Background Technology

[0002] Vertically operated lead screws are typically fixed at the end using lead screw bearing housings. During operation, lubricating oil needs to be applied to the lead screw surface to reduce friction with the lead screw nut and improve transmission efficiency. However, the process of adding and applying lubricating oil is complex and difficult to control, easily leading to excess lubricating oil. Excess lubricating oil, under gravity, easily falls onto the bearing housing at the bottom of the lead screw. Furthermore, lubricating oil generates frictional heat at high speeds, accelerating oxidation and failure of the lubricant. Excess lubricating oil entering the bearing housing can easily cause the bearing to seize or wear, affecting its performance and lifespan.

[0003] Therefore, this utility model proposes a vertically usable lead screw bearing sealing structure to solve the above problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a sealing structure for a vertically used lead screw bearing, which prevents lead screw lubricating oil from entering the bearing housing and provides protection for the bearing housing and bearing.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: a vertically used lead screw bearing sealing structure, wherein a bearing seat is fitted on the lead screw, and an optical shaft is provided above the bearing seat on the lead screw. The innovation is that the bearing sealing structure includes an oil sealing ring, which is fitted on the outside of the optical shaft and sealed and fixed to the optical shaft by a skeleton oil seal. The top end face of the bearing seat extends outward along the axial direction to form an annular protrusion around the optical shaft. The bottom end face of the oil sealing ring has a groove for the annular protrusion to extend into. The annular protrusion is set in the groove and forms a labyrinth seal with the oil sealing ring.

[0006] Furthermore, there is a first gap between the bottom end face of the sealing ring and the top end face of the bearing seat, a second gap between the outer peripheral surface of the annular protrusion and the inner wall of the groove, a third gap between the top surface of the annular protrusion and the bottom surface of the groove, and a fourth gap between the inner peripheral surface of the annular protrusion and the outer wall of the optical axis. The first gap, the second gap, the third gap and the fourth gap cooperate to form a sealing channel for a labyrinth seal.

[0007] Furthermore, the top end face of the sealing ring has a receiving groove for accommodating the skeleton oil seal. The skeleton oil seal is fixed in the receiving groove, and the outer peripheral surface of the skeleton oil seal forms an interference fit with the inner wall of the receiving groove. The inner peripheral surface of the skeleton oil seal forms an interference fit with the outer wall of the optical axis.

[0008] Furthermore, the top end face of the sealing ring is connected to the outer side face by an inclined surface, which slopes from top to bottom in a direction away from the optical axis.

[0009] The advantages of this utility model are:

[0010] This invention installs an oil sealing ring on the optical shaft above the bearing housing of the lead screw, which cooperates with the raised steps on the bearing housing to form a labyrinth seal. When the lubricating oil of the lead screw falls onto the bearing housing under the action of gravity, it cannot enter the interior of the bearing housing, thereby protecting the bearing inside the bearing housing.

[0011] This invention creates gaps between the bottom surface of the oil sealing ring and the top surface of the bearing shaft, the outer peripheral surface of the annular protrusion and the inner wall of the groove, the outer peripheral surface of the skeleton oil seal and the inner wall of the receiving groove, and the inner peripheral surface of the annular protrusion and the outer wall of the optical shaft. These gaps not only cooperate to form a labyrinth seal sealing channel, but also do not affect the relative rotation between the optical shaft and the bearing seat.

[0012] This invention improves the continuity and stability of the sealing effect of the skeleton oil seal by installing the skeleton oil seal in the receiving groove at the top of the sealing ring.

[0013] The top end face of the sealing ring of this invention is connected to the outer side by a downwardly inclined slope, which helps the lubricating oil to slide down from the top end face of the sealing ring and avoids the accumulation of lubricating oil on the top end face of the sealing ring, which would affect the life of the skeleton oil seal. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of the vertically used lead screw bearing sealing structure of this utility model. Detailed Implementation

[0016] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0017] Example

[0018] This embodiment provides a sealing structure for a lead screw bearing used vertically, such as... Figure 1As shown, a bearing housing 1 is mounted on the lead screw, and an optical shaft 4 is located above the bearing housing 1. The bearing sealing structure includes an oil sealing ring 2, which is press-fitted onto the outside of the optical shaft 4 and sealed and fixed to the optical shaft 4 by a skeleton oil seal 3. To improve the continuity and stability of the sealing effect of the skeleton oil seal 3, a receiving groove 201 for accommodating the skeleton oil seal 3 is opened on the top end face of the oil sealing ring 2. The skeleton oil seal 3 is fixed in the receiving groove 201, and the outer peripheral surface of the skeleton oil seal 3 forms an interference fit with the inner wall of the receiving groove 201, and the inner peripheral surface of the skeleton oil seal 3 forms an interference fit with the outer wall of the optical shaft 4. In this embodiment, the top end face and the outer side of the oil sealing ring 2 are connected by a slope 203. The slope 203 is inclined from top to bottom in a direction away from the central axis of the optical shaft 4, which helps the lubricating oil to slide down from the top end face of the oil sealing ring 2 and avoids the accumulation of lubricating oil on the top end face of the oil sealing ring 2, which affects the life of the skeleton oil seal 3.

[0019] The top end face of the bearing housing 1 extends outward along the axial direction to form an annular protrusion 101 surrounding the optical axis 4. The bottom end face of the oil sealing ring 2 has a groove 202 for the annular protrusion 101 to extend into. The annular protrusion 101 is disposed in the groove 202 and forms a labyrinth seal with the oil sealing ring 2. There is a first gap between the bottom end face of the oil sealing ring 2 and the top end face of the bearing housing 1, a second gap between the outer peripheral surface of the annular protrusion 101 and the inner wall of the groove 202, a third gap between the top surface of the annular protrusion 101 and the bottom surface of the groove 202, and a fourth gap between the inner peripheral surface of the annular protrusion 101 and the outer wall of the optical axis 4. The first gap, the second gap, the third gap and the fourth gap cooperate to form a zigzag sealing channel for the labyrinth seal.

[0020] The screw bearing sealing structure uses an oil sealing ring installed on the optical shaft above the screw bearing housing to form a labyrinth seal with the raised steps on the bearing housing. When the screw lubricating oil falls onto the bearing housing under gravity, it cannot enter the bearing housing, thus protecting the bearing inside the bearing housing.

[0021] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A vertically operated lead screw bearing sealing structure, wherein a bearing housing is fitted onto the lead screw, and a light shaft is provided above the bearing housing on the lead screw, characterized in that: The bearing sealing structure includes an oil sealing ring, which is fitted on the outside of the optical shaft and sealed and fixed to the optical shaft by a skeleton oil seal. The top end face of the bearing seat extends outward along the axial direction to form an annular protrusion around the optical shaft. The bottom end face of the oil sealing ring has a groove for the annular protrusion to extend into. The annular protrusion is set in the groove and forms a labyrinth seal with the oil sealing ring.

2. The vertically used lead screw bearing sealing structure according to claim 1, characterized in that: There is a first gap between the bottom end face of the sealing ring and the top end face of the bearing seat, a second gap between the outer peripheral surface of the annular protrusion and the inner wall of the groove, a third gap between the top surface of the annular protrusion and the bottom surface of the groove, and a fourth gap between the inner peripheral surface of the annular protrusion and the outer wall of the optical axis. The first gap, the second gap, the third gap and the fourth gap cooperate to form a sealing channel for a labyrinth seal.

3. The vertically used lead screw bearing sealing structure according to claim 2, characterized in that: The top end face of the sealing ring has a receiving groove for accommodating the skeleton oil seal. The skeleton oil seal is fixed in the receiving groove. The outer peripheral surface of the skeleton oil seal forms an interference fit with the inner wall of the receiving groove, and the inner peripheral surface of the skeleton oil seal forms an interference fit with the outer wall of the optical axis.

4. The vertically used lead screw bearing sealing structure according to claim 3, characterized in that: The top end face of the sealing ring is connected to the outer side face by an inclined surface, which slopes from top to bottom away from the optical axis.

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