A spindle internal bearing protection device

Abstract

The invention discloses a spindle internal bearing protection device, comprising a mandrel, a front end cover, a front end cover outer ring, a front end cover inner ring, a sleeve, an outer labyrinth ring group, an inner labyrinth ring and a bearing, wherein the front end cover and the sleeve are both sleeved on the outer side of the mandrel, the front end cover outer ring and the front end cover inner ring are sleeved between the front end cover and the mandrel, the outer labyrinth ring group is sleeved on the outer side of the inner labyrinth ring and forms a labyrinth portion, and the bearing is sleeved on the outer side of the mandrel and arranged above the outer labyrinth ring group and the inner labyrinth ring. The invention forms a labyrinth portion by forming a pressure difference environment with the outer labyrinth ring group and the inner labyrinth ring group to protect the spindle, and when the spindle rotates, the inner labyrinth ring rotates to cause a pressure difference to generate airflow, so that the side of the outer labyrinth ring group away from the bearing blows air outward to blow liquid out to the front end, and at the same time drives the air on the side of the outer labyrinth ring group close to the bearing to flow to the front end, taking away the heat generated by the rotation of the bearing to achieve heat dissipation and cooling, thereby achieving the purpose of protecting the bearing.

Description

Technical Field

[0001] The invention relates to the field of spindle design and manufacturing, and in particular to a spindle internal bearing protection device. Background Art

[0002] With the development of my country's economy and industrial transformation, machining centers and CNC machine tools are increasingly used in the mechanical processing industry. The machine tool spindle is an indispensable part of the CNC lathe. The internal structure of the spindle clamps the tool, and the servo motor acts as a power to drive the spindle to rotate.

[0003] At present, the main shafts on the market protect the bearings through the protective device composed of the front end cover outer ring and the front end cover inner ring. However, the protective device composed of only the front end cover outer ring and the front end cover inner ring still has defects, and it is easy for water to enter the bearing and grease to overflow, and the service life of the bearing cannot be guaranteed. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a spindle internal bearing protection device in view of the defects existing in the above-mentioned prior art, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a spindle internal bearing protection device comprises a core shaft, a front end cover, a front end cover outer ring, a front end cover inner ring, a sleeve, an outer labyrinth ring group, an inner labyrinth ring and a bearing, the front end cover and the sleeve are both sleeved on the outer side of the core shaft, the sleeve is arranged above the front end cover, the front end cover outer ring and the front end cover inner ring are sleeved between the front end cover and the core shaft, the front end cover inner ring is arranged above the front end cover outer ring and is tightly connected with the front end cover outer ring, the inner labyrinth ring is sleeved on the outer side of the core shaft and arranged above the front end cover outer ring and the front end cover inner ring, the outer labyrinth ring group is sleeved on the outer side of the inner labyrinth ring and forms a labyrinth portion, and the bearing is sleeved on the outer side of the core shaft and arranged above the outer labyrinth ring group and the inner labyrinth ring.

[0006] As a further elaboration of the above technical solution:

[0007] In the above technical solution, the outer labyrinth ring group includes an upper outer labyrinth ring and a lower outer labyrinth ring, the upper outer labyrinth ring is sleeved on the upper end of the inner labyrinth ring, and the lower outer labyrinth ring is sleeved on the lower end of the inner labyrinth ring, and the inner side surface formed by the upper outer labyrinth ring and the lower outer labyrinth ring cooperates with the outer side surface of the inner labyrinth ring to form a labyrinth part.

[0008] In the above technical solution, the bottom surface of the upper outer labyrinth ring is recessed inward to form a first groove, and the inner side surface extends downward to form a first convex circle. The top surface of the inner labyrinth ring is recessed inward to form a second groove matching with the first convex circle, and the outer side surface extends upward to form a second convex circle matching with the first groove. The first convex circle is matched and plugged with the second groove, and the second convex circle is matched and plugged with the first groove.

[0009] In the above technical solution, the outer surface of the inner labyrinth ring extends outward to form a third convex ring with a conical cross-section, and the inner side surfaces of the upper outer labyrinth ring and the lower outer labyrinth ring form a third groove matching the shape and size of the third convex ring, and the third convex ring is plugged into the third groove.

[0010] In the above technical solution, the third convex ring on the inner labyrinth ring is symmetrically provided with a plurality of notches along its axis.

[0011] In the above technical solution, the notch is an arc-shaped notch.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The present invention forms a labyrinth portion through an outer labyrinth ring group and an inner labyrinth ring group to create a pressure difference environment to protect the main shaft. When the main shaft rotates, the inner labyrinth ring rotates to cause a pressure difference to generate airflow, so that the side of the outer labyrinth ring group away from the bearing blows air outward to blow the liquid to the front end, and at the same time drives the air on the side of the outer labyrinth ring group close to the bearing to flow to the front end, taking away the heat generated by the rotation of the bearing to achieve heat dissipation and cooling, thereby achieving the purpose of protecting the bearing.

[0014] 2. In the present invention, the outer surface of the inner labyrinth ring extends outward to form a third convex ring with a conical cross-section, and the inner side surfaces of the upper outer labyrinth ring and the lower outer labyrinth ring form a third groove that matches the shape and size of the third convex ring. The third convex ring is plugged into the third groove. The third convex ring on the inner labyrinth ring is symmetrically provided with a plurality of notches along its axis. Through the setting of the notches, a pressure difference is generated inside when the main shaft rotates, forming an airflow to cool the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a partial structural cross-sectional view of the present invention;

[0016] Figure 2 It is a schematic diagram of the structure of the inner labyrinth ring in the present invention;

[0017] Figure 3 is a cross-sectional view of the inner labyrinth ring of the present invention;

[0018] Figure 4 It is a schematic diagram of the structure of the inner and outer labyrinth ring groups of the present invention.

[0019] In the figure: 1. core shaft; 2. front end cover; 3. outer ring of front end cover; 4. inner ring of front end cover; 5. sleeve; 6. outer labyrinth ring assembly; 61. upper outer labyrinth ring; 62. lower outer labyrinth ring; 63. first groove; 64. first convex ring; 65. third groove; 7. inner labyrinth ring; 71. second groove; 72. second convex ring; 73. third convex ring; 74. notch; 8. bearing. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] The embodiments described with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and cannot be understood as limiting the present application. In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meanings of "several" and "multiple" are two or more, unless otherwise clearly and specifically defined. In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. In this application, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature can include the first and second features being in direct contact, or it can include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] like Figure 1-4 As shown, a spindle internal bearing protection device includes a core shaft 1, a front end cover 2, a front end cover outer ring 3, a front end cover inner ring 4, a sleeve 5, an outer labyrinth ring group 6, an inner labyrinth ring 7 and a bearing 8, the front end cover 2 and the sleeve 5 are both sleeved on the outer side of the core shaft 1, the sleeve 5 is arranged above the front end cover 2, the front end cover outer ring 3 and the front end cover inner ring 4 are sleeved between the front end cover 2 and the core shaft 1, the front end cover inner ring 4 is arranged above the front end cover outer ring 3 and is tightly connected with the front end cover outer ring 3, and the inner labyrinth ring 7 is sleeved on the outer side of the core shaft 1 and is arranged above the front end cover outer ring 3 and the front end cover inner ring 4. The outer labyrinth ring group 6 is sleeved on the outer side of the inner labyrinth ring 7 to form a labyrinth part, and the bearing 8 is sleeved on the outer side of the core shaft 1 and is arranged above the outer labyrinth ring group 6 and the inner labyrinth ring 7. The outer labyrinth ring group 6 and the inner labyrinth ring 7 form a labyrinth part to create a pressure difference environment to protect the main shaft. When the main shaft rotates, the inner labyrinth ring 7 rotates to cause the pressure difference to generate airflow, so that the side of the outer labyrinth ring group 6 away from the bearing 8 blows air outward to blow the liquid to the front end, and at the same time drives the air on the side of the outer labyrinth ring group 6 close to the bearing 8 to flow to the front end, taking away the heat generated by the rotation of the bearing 8 to achieve heat dissipation and cooling, thereby achieving the purpose of protecting the bearing 8.

[0023] Among them, the mandrel 1 serves as the main transmission part of the main shaft. The front end cover 2 protects the front end of the mandrel 1 to prevent external conditions from colliding with the mandrel 1 and causing damage to the mandrel 1. The front end cover outer ring 3 and the front end cover inner ring 4 form a protective device to prevent the liquid from flowing back to the bearing 8 and affecting the service life of the bearing 8. The sleeve 5 serves as a shell to protect the internal structure of the main shaft and also serves as a connection for installing the main shaft on the machine tool. The bearing 8 is the most important component in the main shaft, which supports the rotation of the main shaft, reduces friction during movement and ensures the rotation accuracy.

[0024] In this embodiment, Figures 2 to 4As shown, the outer labyrinth ring set 6 includes an upper outer labyrinth ring 61 and a lower outer labyrinth ring 62, wherein the upper outer labyrinth ring 61 is sleeved on the upper end of the inner labyrinth ring 62, and the lower outer labyrinth ring 62 is sleeved on the lower end of the inner labyrinth ring 7, and the inner side surface formed by the upper outer labyrinth ring 61 and the lower outer labyrinth ring 62 cooperates with the outer side surface of the inner labyrinth ring 7 to form a labyrinth portion. Specifically, the bottom surface of the upper outer labyrinth ring 61 is recessed inward to form a first groove 63, and the inner side surface extends downward to form a first convex ring 64, the top surface of the inner labyrinth ring 7 is recessed inward to form a second groove 71 that cooperates with the first convex ring 6, and the outer side surface extends upward to form a second convex ring 72 that cooperates with the first groove 63, the first convex ring 64 cooperates with the second groove 63 for insertion, and the second convex ring 72 cooperates with the first groove 63 for insertion. Specifically, the outer surface of the inner labyrinth ring 7 extends outward to form a third protrusion 73 with a conical cross-section, and the inner side surfaces of the upper outer labyrinth ring 61 and the lower outer labyrinth ring 62 form a third groove 65 that matches the shape and size of the third protrusion 73, and the third protrusion 73 is plugged into the third groove 65.

[0025] Preferably, if Figure 2 As shown, the third convex ring 73 on the inner labyrinth ring 7 is symmetrically provided with a plurality of notches 74 along its axis. Through the arrangement of the notches 74, when the main shaft rotates, a pressure difference is generated inside, forming an airflow to cool the bearing 8. In this embodiment, seven notches 74 are symmetrically arranged along the axis of the inner labyrinth ring 7, and the notches 74 are arc-shaped notches. Of course, the specific number, distribution method and shape of the notches 74 can be set according to different models of products and functional requirements of different products, and are not limited to this embodiment.

[0026] The present invention forms a labyrinth portion through an outer labyrinth ring group 6 and an inner labyrinth ring group 7 to create a pressure difference environment to protect the main shaft. When the main shaft rotates, the side of the outer labyrinth ring group 6 close to the bearing generates airflow to dissipate heat and cool the inside of the bearing 8, thereby reducing the temperature of the bearing 8 during the rotation of the main shaft. The side of the outer labyrinth ring group 6 away from the bearing 8 blows out the liquid generated at the front end of the main shaft to prevent water from entering the bearing 8, thereby effectively protecting the bearing 8 and ensuring the service life of the bearing 8.

[0027] The above does not limit the technical scope of the present invention in any way. Any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A spindle internal bearing protection device, characterized in that: It includes a core shaft, a front end cover, a front end cover outer ring, a front end cover inner ring, a sleeve, an outer labyrinth ring group, an inner labyrinth ring and a bearing, the front end cover and the sleeve are both sleeved on the outer side of the core shaft, the sleeve is arranged above the front end cover, the front end cover outer ring and the front end cover inner ring are sleeved between the front end cover and the core shaft, the front end cover inner ring is arranged above the front end cover outer ring and is tightly connected with the front end cover outer ring, the inner labyrinth ring is sleeved on the outer side of the core shaft and arranged above the front end cover outer ring and the front end cover inner ring, the outer labyrinth ring group is sleeved on the outer side of the inner labyrinth ring and forms a labyrinth portion, and the bearing is sleeved on the outer side of the core shaft and arranged above the outer labyrinth ring group and the inner labyrinth ring; The outer labyrinth ring group comprises an upper outer labyrinth ring and a lower outer labyrinth ring, wherein the upper outer labyrinth ring is sleeved on the upper end of the inner labyrinth ring, and the lower outer labyrinth ring is sleeved on the lower end of the inner labyrinth ring, and the inner side surface formed by the upper outer labyrinth ring and the lower outer labyrinth ring cooperates with the outer side surface of the inner labyrinth ring to form a labyrinth portion; The bottom surface of the upper outer labyrinth ring is recessed inward to form a first groove, and the inner side surface extends downward to form a first convex ring. The top surface of the inner labyrinth ring is recessed inward to form a second groove matched with the first convex ring, and the outer side surface extends upward to form a second convex ring matched with the first groove. The first convex ring is matched and plugged with the second groove, and the second convex ring is matched and plugged with the first groove. The outer side surface of the inner labyrinth ring extends outward to form a third convex ring with a conical cross section, and the inner side surfaces of the upper outer labyrinth ring and the lower outer labyrinth ring form a third groove that matches the shape and size of the third convex ring, and the third convex ring is plugged in with the third groove; The third convex ring on the inner labyrinth ring is symmetrically provided with a plurality of notches along its axis.

2. A spindle internal bearing protection device according to claim 1, characterized in that: The notch is an arc-shaped notch.

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