High-precision self-sealing bearing

Abstract

The utility model relates to a high-precision self-sealing bearing. The high-precision self-sealing bearing comprises a seat ring, a shaft ring and a plurality of steel balls annularly arranged between the seat ring and the shaft ring, an extending part is formed at the upper end of the inner diameter of the seat ring in the inner diameter direction; the section of the shaft washer is of a stepped table type structure with a boss in the middle and two concave sides, a shaft washer concave table in the inner diameter direction of the bearing and the boss in the middle are of a right-angle structure, and a shaft washer concave table in the outer diameter direction of the shaft washer and the boss in the middle form a groove. The seat ring and the shaft ring are matched in an embedded mode. The groove of the shaft ring completely wraps the lower end of the seat ring, and the middle boss of the shaft ring is embedded below the seat ring extension part; through the internal design of the bearing, the bearing has the characteristics of no maintenance, ultra-silence, self-sealing, high operation precision, high system rigidity and the like; a radial load, a bidirectional axial load and a moment load can be borne; the internal design of the bearing is combined with a precision tolerance manufacturing process, the radial run-out is superior to the P4 tolerance grade, and the axial run-out is close to the P4 tolerance grade.

Description

TECHNICAL FIELD

[0001] The utility model relates to rotating application bearing type product, concretely relates to the multi -shaft head part for supporting rotating workbench, index head and machining center, can bear radial load, two -way axial load and torque load a kind of high-precision self-sealing bearing. BACKGROUND

[0002] In bearing application, for the multi -shaft head part for supporting rotating workbench, index head and machining center, due to the particularity of using equipment, high-precision bearing needs to be matched;And this high-precision bearing needs to be focused on maintenance-free, super-silence, self-sealing, high running accuracy, high system stiffness and other dimensions, so a bearing capable of realizing the above functions is needed to meet the use requirements. SUMMARY

[0003] In order to be able to be applied in special use equipment, achieve the requirement, the utility model discloses a high-precision self-sealing bearing, which is designed inside the bearing to have the characteristics of maintenance-free, super-silence, self-sealing, high running accuracy, high system stiffness and the like.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme of: a high-precision self-sealing bearing, comprising: a raceway, a shaft ring, and a plurality of steel balls arranged around the raceway and the shaft ring; the raceway has an extension part formed in the inner diameter direction at the upper end position; the shaft ring has a stepped platform structure with a central boss and concave sides; the concave platform in the inner diameter direction of the bearing and the central boss form a right angle structure, and the concave platform in the outer diameter direction of the bearing and the central boss form a groove structure; the raceway and the shaft ring form a mutual embedding type fit; the groove of the shaft ring completely wraps the lower end of the raceway, and the central boss of the shaft ring is embedded below the extension part of the raceway.

[0005] Further, the corresponding positions of the raceway, the shaft ring and the steel balls are the raceways, the raceway contact areas between the raceway and the shaft ring above and below the position of the steel ball include the upper raceway contact area and the lower raceway contact area, and the corresponding fit areas between the raceway and the shaft ring form a self-lubricating oil path.

[0006] Further, the edge of the raceway extension part covers at least the outer diameter edge of the central boss of the shaft ring, forming an overlapping area.

[0007] Further, the upper end surface of the outer side wall of the groove of the shaft ring covers at least the edge of the lower end surface of the raceway, forming an overlapping area, and the position of the shaft ring corresponding to the raceway is the outer diameter outlet of the raceway.

[0008] Further, the self-lubricating oil path is a three-bent "double L" shaped structure, the area between the bottom of the groove of the shaft ring corresponding to the lower end surface of the race is an oil film interface; through the contact area of the raceway to the oil film interface to the outer diameter outlet of the race, a "double L" shaped self-lubricating oil path is formed; the path from the upper raceway contact area to the lower raceway contact area is referred to as a first "L" shape, and the path from the oil film interface to the outer diameter outlet of the race is referred to as a second "L" shape; the first "L" shape and the second "L" shape are connected to form a three-bent self-lubricating oil path; the design realizes maintenance-free bearing;

[0009] Further, the lower end surface of the race is designed with a trapezoidal storage oil groove channel, and the storage oil groove channel is filled with high-performance lubricating grease; the design has the effect of forming a long-term reliable oil film at the oil film interface during operation, which is beneficial to reduce wear, reduce vibration, compensate balance, and control temperature rise; thereby realizing the super-silent feature of the bearing;

[0010] Further, the corresponding matching area between the race and the shaft ring also forms a "double L" shaped sealing channel;

[0011] Further, the overlapping area position of the extension of the race and the middle boss of the shaft ring forms a self-sealing interface A, and the vertical channel area below the steel ball is a self-sealing interface B; the "double L" shaped sealing channel, i.e., the self-sealing interface A - the self-sealing interface B - the oil film interface, realizes the sealing effect; thereby realizing the self-sealing feature of the bearing;

[0012] Further, the bearing radial runout of the scheme is better than the P4 tolerance level, and the axial runout is close to the P4 tolerance level; thereby realizing the high running accuracy of the bearing;

[0013] Further, in order to strengthen the bearing and realize high system stiffness, an integral bearing inner diameter is further formed in the direction of the lower concave boss side of the shaft ring in the direction of the inner diameter of the bearing to support the strength of the shaft ring;

[0014] The threaded hole is arranged at the bearing inner diameter, which plays a role of bearing installation positioning; this installation mode is relatively safe and reliable, convenient and stable;

[0015] Further, the inner diameter height of the shaft ring is flush with the inner diameter direction of the bearing.

[0016] Further, bolt connection holes are arranged on the upper end surfaces of the race and the shaft ring; during installation, the race and the shaft ring are supported by the steel ball, and the race and the shaft ring are connected with the machine body through respective bolts; during operation, the shaft ring is fixed, and the race rotates.

[0017] The beneficial effects of the high-precision self-sealing bearing are as follows:

[0018] Through its internal design, this bearing features maintenance-free operation, ultra-quiet operation, self-sealing, high running accuracy, and high system rigidity. It can withstand radial loads, bidirectional axial loads, and moment loads. Combined with precision-tolerance manufacturing processes, the bearing's internal design achieves radial runout better than the P4 tolerance grade, while its axial runout is close to the P4 tolerance grade. This bearing has been successfully adopted as an ideal choice for machine tools and other high-precision applications, such as high-speed wire rolling mill stands, gearboxes, and innovative fluid handling applications. Simultaneously, the bearing minimizes noise, vibration, and generated heat. Attached Figure Description

[0019] Figure 1 This is a structural diagram of the high-precision self-sealing bearing of this utility model.

[0020] In the figure, 1. Seat ring, 2. Shaft ring, 3. Steel ball, 1.1. Extension, 2.1. Central boss, 4. Raceway contact area, 2.2. Shaft ring recess in the bearing inner diameter direction, 2.1.1. Outer diameter of the central boss of the shaft ring, 2.3. Outer wall of the groove, 1.2. Outer diameter outlet of the seat ring, 5. Oil film interface, 6. Trapezoidal oil storage groove, 7. Self-sealing interface A, 8. Self-sealing interface B, 9. Shaft ring inner diameter, 10. Bolt connection hole, 11. Threaded hole. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0022] like Figure 1 A high-precision self-sealing bearing is shown, comprising: a housing ring 1, a shaft ring 2, and a plurality of steel balls 3 arranged between the housing ring 1 and the shaft ring 2; the housing ring 1 has an extension 1.1 extending inward from the upper end of its inner diameter; the shaft ring 2 has a stepped structure with a central boss 2.1 and recessed sides, the recessed platform 2.2 of the shaft ring in the bearing inner diameter direction and the central boss 2.1 are at right angles, and the recessed platform of the shaft ring in the shaft ring outer diameter direction and the central boss 2.1 form a groove; the housing ring 1 and the shaft ring 2 are mutually embedded; the groove of the shaft ring 2 completely covers the lower end of the housing ring 1, and the central boss 2.1 of the shaft ring 2 is embedded below the extension 1.1 of the housing ring 1;

[0023] The position corresponding to the steel ball 3 of the raceway 1 and the raceway 2 is a rolling track, and the rolling track contact area 4 is between the raceway 1 and the raceway 2 above and below the position of the steel ball 3, including the upper rolling track contact area and the lower rolling track contact area, and the corresponding matching area between the raceway 1 and the raceway 2 forms a self-lubricating oil path;

[0024] The edge of the raceway extension 1.1 covers at least the edge of the outer diameter 2.2.1 of the middle boss of the raceway, forming an overlapping area;

[0025] The upper end surface of the outer side wall 2.3 of the groove of the raceway 2 covers at least the edge of the lower end surface of the raceway 1, forming an overlapping area, and the position of the raceway 2 corresponding to the raceway 1 is the outer diameter outlet 1.2 of the raceway;

[0026] The self-lubricating oil path is a three-bend "double L" structure, and the area between the position corresponding to the bottom of the groove of the raceway 2 of the raceway 1 is the oil film interface 5; through the rolling track contact area to the oil film interface 5 to the outer diameter outlet 1.2 of the raceway, forming a "double L" self-lubricating oil path; the path from the upper rolling track contact area to the lower rolling track contact area is called the first "L" shape, and the path from the oil film interface 5 to the outer diameter outlet 1.2 of the raceway is called the second "L" shape; the first "L" shape and the second "L" shape are connected to form a three-bend self-lubricating oil path; the design realizes the maintenance-free bearing;

[0027] The lower end surface of the raceway 1 is designed with a trapezoidal oil storage groove 6, and the oil storage groove 6 is filled with high-performance lubricating grease; the design is to form a long-term reliable oil film at the oil film interface 5 during work, which is beneficial to reduce wear, reduce vibration, compensate balance and control temperature rise; thereby realizing the super-silent feature of the bearing;

[0028] The corresponding matching area between the raceway 1 and the raceway 2 also forms a "double L" sealing channel;

[0029] The overlapping area position of the extension 1.1 of the raceway and the middle boss 2.1 of the raceway forms a self-sealing interface A7, and the vertical channel area below the steel ball 3 is a self-sealing interface B8; the "double L" sealing channel, i.e. the self-sealing interface A7-the self-sealing interface B8-the oil film interface 5, realizes the sealing effect; and further realizes the self-sealing feature of the bearing;

[0030] The radial runout of the bearing of the scheme is better than the P4 tolerance level, and the axial runout is close to the P4 tolerance level; the high running accuracy of the bearing is realized;

[0031] In order to strengthen the bearing and realize high system stiffness, an integral bearing inner diameter 9 is further formed in the direction of the lower concave boss 2.2 side of the raceway in the direction of the inner diameter of the bearing to support the strength of the raceway 2;

[0032] The bearing inner diameter 9 is provided with a threaded hole 11.

[0033] The inner diameter 9 height of the shaft ring is flush with the lower concave platform 2.2 table in the bearing inner diameter direction.

[0034] The seat ring 1 and the upper end face of the shaft ring 2 are provided with bolt connection holes 10, when installing, the seat ring 1 and the shaft ring 2 are supported by the steel ball 3, and the seat ring 1 and the shaft ring 2 are connected with the machine body through the bolts respectively; when running, the shaft ring 2 is fixed, and the seat ring 1 rotates.

[0035] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.

[0036] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0037] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0038] In the utility model, unless another definite provision and limitation, first feature is on second feature "up" or "down" can be first and second feature direct contact, or first and second feature indirect contact through intermediate medium. Moreover, first feature is on second feature "on", "above" and "upper surface" can be first feature is on second feature directly above or obliquely above, or just indicate first feature horizontal height is higher than second feature. First feature is on second feature "under", "below" and "lower surface" can be first feature is on second feature directly below or obliquely below, or just indicate first feature horizontal height is less than second feature.

Claims

1. A high-precision self-sealing bearing, characterized in that, It comprises: The seat ring, the shaft ring and a plurality of steel balls arranged between the seat ring and the shaft ring; an extension is formed on the inner diameter of the seat ring at the upper end position in the inner diameter direction; the cross section of the shaft ring is a stepped platform structure with a middle convex platform and concave sides; the shaft ring concave platform in the inner diameter direction of the bearing forms a right angle with the middle convex platform, and the shaft ring concave platform in the outer diameter direction of the bearing forms a groove with the middle convex platform; the seat ring and the shaft ring form a mutual embedded fitting; the groove of the shaft ring completely covers the lower end of the seat ring, and the middle convex platform of the shaft ring is embedded below the extension of the seat ring.

2. A high-precision self-sealing bearing according to claim 1, characterized in that: The corresponding positions of the seat ring, the shaft ring and the steel balls are the raceways, the areas between the seat ring and the shaft ring above and below the positions of the steel balls are the raceway contact areas, which include the upper raceway contact area and the lower raceway contact area, and the corresponding fitting areas between the seat ring and the shaft ring form a self-lubricating oil path.

3. A high-precision self-sealing bearing according to claim 1, characterized in that: The edge of the extension of the seat ring covers at least the outer diameter edge of the middle convex platform of the shaft ring, forming an overlapping area.

4. A high-precision self-sealing bearing according to claim 1, characterized in that: The outer side wall of the groove of the shaft ring covers at least the edge of the lower end surface of the seat ring, forming an overlapping area, and the position of the shaft ring corresponding to the seat ring is the outer diameter outlet of the seat ring.

5. A high-precision self-sealing bearing according to claim 2, characterized in that: The self-lubricating oil path is a three-bend "double L" shape structure, the area between the lower end surface of the seat ring corresponding to the groove bottom position of the shaft ring is an oil film interface; the "double L" shape self-lubricating oil path is formed from the raceway contact area to the oil film interface to the outer diameter outlet of the seat ring; the path from the upper raceway contact area to the lower raceway contact area is called the first "L" shape, and the path from the oil film interface to the outer diameter outlet of the seat ring is called the second "L" shape; the first "L" shape and the second "L" shape constitute a three-bend self-lubricating oil path.

6. A high-precision self-sealing bearing according to claim 5, characterized in that: The lower end surface of the seat ring is designed with a trapezoidal storage oil groove, and the storage oil groove is filled with high-performance lubricating grease.

7. A high-precision self-sealing bearing according to claim 5, characterized in that: The corresponding fitting areas between the seat ring and the shaft ring also form a "double L" shape sealing channel.

8. A high-precision self-sealing bearing according to claim 7, characterized in that: The overlapping area position of the extension of the seat ring and the middle convex platform of the shaft ring forms a self-sealing interface A, and the vertical channel area below the steel ball is a self-sealing interface B; the "double L" shape sealing channel is the self-sealing interface A-self-sealing interface B-oil film interface.

9. A high-precision self-sealing bearing according to claim 1, characterized in that: An integral bearing inner diameter is also formed on the side surface of the shaft ring concave platform in the inner diameter direction of the bearing.

10. A high-precision self-sealing bearing according to claim 9, characterized in that: The inner diameter height of the shaft ring is flush with the platform surface of the shaft ring concave platform in the inner diameter direction of the bearing.

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