A servo motor end cover bearing chamber and a servo motor with the bearing chamber

Abstract

The application provides a servo motor end cover bearing chamber and a servo motor with the bearing chamber. The cover body is provided with a bearing chamber body, the inner surface of the bearing chamber body is provided with a plurality of bearing matching parts arranged at intervals in the circumferential direction, a bearing chamber groove is arranged between adjacent bearing matching parts, and the bearing matching part is in contact with the outer surface of the bearing. The servo motor end cover bearing chamber provided by the application is not in direct contact with the bearing, the contact area of the bearing chamber body and the bearing is reduced, the bearing can be stably fixed while the pressure applied to the bearing during shrink fitting is reduced, the damage to the bearing is reduced, and sufficient radial bearing capacity is maintained.

Description

Technical Field

[0001] This invention belongs to the field of motor end cover technology. The invention relates to a servo motor end cover bearing chamber and a servo motor having the bearing chamber. Background Technology

[0002] Bearings are important components of servo motors that reduce friction during rotor shaft operation, help ensure the rotational accuracy of the rotor shaft, and also protect the shaft. The bearing housing is the part of the servo motor that fits with the outer diameter of the bearing and enables it to work normally. It is located on the front and rear end covers of the servo motor and is used to support the radial load of the rotor assembly and the bearing.

[0003] During bearing assembly, the end cover and bearing are typically fitted with an interference fit, achieved by heating the end cover. The elasticity of the material expands the bearing housing, allowing it to fit over the bearing. When the bearing is fitted into the end cover, it experiences pressure from the bearing housing, which travels from the outer ring through the balls to the inner ring. This pressure can damage the bearing already assembled in the housing, leading to significant vibration and noise during high-speed operation of the servo motor. Furthermore, the motor end cover is made of die-cast aluminum, which has high mechanical strength but poor thermal conductivity. Traditional bearing housings are closed structures, and the significant heat generated during high-speed bearing operation is difficult to dissipate. The expansion of the bearing housing under heat can cause misalignment with the bearing, further damaging the bearing. Summary of the Invention

[0004] Therefore, the present invention provides a bearing housing for a servo motor end cover. By setting a groove in the bearing housing, the contact area between the bearing housing body and the bearing can be reduced, thereby reducing the technical problem of bearing wear during bearing assembly.

[0005] To solve the above problems, the present invention provides a bearing housing for a servo motor end cover. The cover is provided with a bearing housing body. The inner surface of the bearing housing body is provided with a plurality of bearing mating parts arranged circumferentially. A bearing housing groove is formed between adjacent bearing mating parts. The bearing mating parts are in contact with the outer surface of the bearing.

[0006] In some embodiments, the space between the bearing housing recess and the bearing is filled with thermally conductive colloid.

[0007] In some embodiments, the bearing mating part is annular, and a bearing chamber pressure relief groove is provided along the circumference of the bearing mating part.

[0008] In some embodiments, the radial width of the bearing housing pressure relief groove is 0.3 mm.

[0009] In some embodiments, the bearing mating part is provided with double rows of bearing chamber pressure relief grooves. The distance between the inner bearing chamber pressure relief groove and the inner diameter of the bearing mating part is 1 / 5 to 1 / 3 of the bearing chamber groove depth, and the distance between the outer bearing chamber pressure relief groove and the inner diameter of the bearing mating part is 1 / 2 to 4 / 5 of the bearing chamber groove depth.

[0010] In some embodiments, a washer receiving cavity is provided at the end of the bearing housing body away from the bearing inlet, and the washer and the washer receiving cavity are either interference fit or clearance fit.

[0011] In some implementations, the axial width of the washer receiving cavity is 0.3-0.5 times the axial width of the bearing.

[0012] In some implementations, the radial width of the washer receiving cavity is 0.85-0.92 times the outer diameter of the bearing.

[0013] In some embodiments, the groove depth of the bearing housing recess is 0.1-0.2 times the inner diameter of the bearing housing body.

[0014] In some implementations, the bearing mating portion and the bearing housing groove are rounded.

[0015] The present invention provides a servo motor end cover bearing housing and a servo motor having the bearing housing, which have the following beneficial effects:

[0016] The servo motor end cover bearing housing provided by this invention has a bearing housing groove that does not directly contact the bearing, reducing the contact area between the bearing housing body and the bearing. This can stably fix the bearing while reducing the pressure applied to the bearing during heat fitting, reducing bearing damage, and maintaining sufficient radial load-bearing capacity. Attached Figure Description

[0017] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0019] Figure 1This is a schematic diagram of the structure of a servo motor end cover bearing chamber according to an embodiment of the present invention;

[0020] Figure 2 This is a front view of the bearing chamber of the servo motor end cover according to an embodiment of the present invention;

[0021] Figure 3 This is a cross-sectional schematic diagram of the servo motor end cover bearing chamber and bearing assembly according to an embodiment of the present invention;

[0022] Figure 4 for Figure 2 A magnified view of the details at point A in the middle.

[0023] The reference numerals in the attached drawings are as follows: 1-cover; 2-bearing mating part; 3-bearing chamber groove; 4-washer receiving cavity; 5-bearing chamber pressure relief groove; 6-bearing. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0028] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0029] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0030] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0031] See also Figure 1As shown, according to an embodiment of the present invention, a servo motor end cover bearing housing is provided. The cover 1 is provided with a bearing housing body, and the inner surface of the bearing housing body is provided with a plurality of bearing mating parts 2, which are arranged circumferentially at intervals. A bearing housing groove 3 is formed between adjacent bearing mating parts 2, and the bearing mating parts 2 are in contact with the outer surface of the bearing 6. After the cover 1 is heated, the bearing 6 is installed into the bearing housing body. The bearing 6 is in direct contact with the bearing mating parts 2, and a certain gap is left between the bearing 6 and the bearing housing groove 3. The bearing 6 does not contact the bearing housing groove 3, which reduces the mating contact area between the bearing housing body and the bearing 6. This can stably fix the bearing 6 while reducing the pressure applied to the bearing 6 during heat fitting, reducing damage to the bearing 6, and maintaining sufficient radial load-bearing capacity.

[0032] Specifically, the cover 1 is made of die-cast aluminum, and the bearing mating part 2 is divided into three equal parts, with the centers spaced 120° apart, arranged in a ring array. In other embodiments, the bearing mating part 2 can be divided into four, five, or six equal parts, evenly distributed in a ring array, depending on the usage requirements and to meet the radial load-bearing capacity of the bearing 6.

[0033] In this embodiment, the contact area between the bearing housing body and the bearing 6 is reduced, and the three parts are evenly distributed, which is half of the original contact area. Each part is 60° apart, and the annular pressure applied to the bearing 6 at the center is about 120° apart. This can stably fix the bearing 6 while maintaining sufficient radial load-bearing capacity.

[0034] Specifically, the bearing mating part 2 and the bearing housing groove 3 are transitioned with a rounded corner with a radius of 1.8mm. To facilitate the pressing of the bearing 6 into the bearing housing during heat fitting, a 0.5mm chamfer can be provided at the stop of the bearing mating part 2.

[0035] See also Figure 2 and Figure 4 As shown, the bearing mating part 2 is annular, and a bearing chamber pressure-reducing groove 5 is provided along the circumference of the bearing mating part 2. The groove depth of the bearing chamber pressure-reducing groove 5 is adapted to the thickness of the bearing mating part 2, and the radial width of the bearing chamber pressure-reducing groove 5 is 0.3 mm. The width of the bearing chamber pressure-reducing groove 5 should not be too large. The two sides of the bearing chamber pressure-reducing groove 5 in the height direction are respectively arc-shaped, and the arc is 1 / 60 of the inner diameter of the bearing mating part 2. By providing the bearing chamber pressure-reducing groove 5 on the bearing mating part 2, the pressure exerted by the bearing chamber body on the bearing 6 when the end cover heat-fits the bearing 6 is reduced. The bearing chamber pressure-reducing groove 5 can also be filled with buffer material to reduce the impact force acting on the bearing mating part 2. The buffer material is existing technology and will not be described in detail here.

[0036] In one specific implementation, the bearing mating part 2 is provided with double rows of bearing chamber pressure-reducing grooves 5. The distance between the inner bearing chamber pressure-reducing groove 5 and the inner diameter of the bearing mating part 2 is 1 / 5 to 1 / 3, preferably 1 / 4, of the depth of the bearing chamber groove 3; the distance between the outer bearing chamber pressure-reducing groove 5 and the inner diameter of the bearing mating part 2 is 1 / 2 to 4 / 5, preferably 3 / 5, of the depth of the bearing chamber groove 3. Each row has 3 bearing chamber pressure-reducing grooves 5, that is, each bearing mating part 2 has 6 bearing chamber pressure-reducing grooves 5. The centers of the bearing chamber pressure-reducing grooves 5 within the same bearing mating part 2 area are spaced 15° apart. The number of bearing chamber pressure-reducing grooves 5 can be adjusted according to the number of bearing mating parts 2. Considering mechanical strength and rigidity, the number of bearing chamber pressure-reducing grooves 5 should not be too large, and they should be evenly distributed in a ring.

[0037] See also Figure 1 As shown, the bearing housing groove 3 is formed by excavating deep into the inner diameter of the bearing housing body. The groove depth of the bearing housing groove 3 is 0.1-0.2 times the inner diameter of the bearing housing body, preferably 0.125. The number of bearing housing accommodating grooves is determined by the bearing mating parts 2. In this embodiment, three bearing housing grooves 3 are provided, each spaced 60° apart. One bearing housing groove 3 is provided between adjacent bearing mating parts 2. In other embodiments, considering mechanical strength and rigidity, the arrangement and number of bearing mating parts 2 and bearing housing grooves 3 can be reasonably set according to usage requirements and the number of bearing housing bodies.

[0038] After bearing 6 is installed in the bearing housing body, a certain gap remains between the bearing housing groove 3 and bearing 6. A thermally conductive colloid is filled between the bearing housing groove 3 and bearing 6. Polyurethane can be selected as the thermally conductive colloid. To further improve the heat dissipation of bearing 6, a metal filler with a higher thermal conductivity can be selected. To reduce costs, a lower-cost epoxy resin filler can be selected. Filling the space between the bearing housing groove 3 and bearing 6 with the thermally conductive colloid fixes bearing 6 and reduces its temperature. Simultaneously, it prevents relative movement and displacement between the bearing housing body and bearing 6 due to material expansion when the bearing housing body overheats.

[0039] In this embodiment, after the bearing 6 cools in the bearing chamber, the bearing mating part 2 contacts the bearing 6. The internal space of the bearing chamber groove 3 is not connected to the internal space of the bearing mating part 2, so the injected thermally conductive colloid will not contact the contact surface between the bearing mating part 2 and the bearing 6. After the bearing 6 is heat-fitted into the cover 1 and reaches the predetermined optimal position in the bearing chamber, the thermally conductive colloid can be filled into the bearing chamber groove 3. The thermally conductive colloid is filled to a distance of 2mm from the outer end face of the bearing 6. After the thermally conductive colloid is filled, it is air-dried or heat-cured according to its chemical properties. The heat generated by the bearing 6 during motor operation is conducted to the cover 1 through the thermally conductive colloid. The thermally conductive colloid is selected as a filler with high adhesion. After air-drying or heat-curing, it can stably fix the bearing 6 and will not be affected by the thermal expansion of the end cover during high-speed motor operation, so that the bearing 6 will not experience relative movement or displacement.

[0040] See also Figure 2 and Figure 3 As shown, a washer receiving cavity 4 is provided at the end of the bearing housing body away from the bearing 6 inlet. The washer and the washer receiving cavity 4 are either interference-fitted or clearance-fitted. The axial width of the washer receiving cavity 4 is 0.3-0.5 times the axial width of the bearing 6. The radial width of the washer receiving cavity 4 is 0.85-0.92 times the outer diameter of the bearing 6. Before assembling the bearing 6, a washer is placed in the washer receiving cavity 4. The washer is an elastic rubber ring, which serves to buffer and offset, reducing noise and vibration of the bearing 6 during motor operation.

[0041] This application also relates to a servo motor having a servo motor end cover bearing housing as described above. The components of the servo motor of this application, except for the end cover bearing housing, can utilize existing technology and will not be described in detail here.

[0042] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0043] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A bearing housing for a servo motor end cover, characterized in that, The cover (1) is provided with a bearing chamber body, and the inner surface of the bearing chamber body is provided with a plurality of bearing mating parts (2) arranged circumferentially at intervals, with openings between adjacent bearing mating parts (2). There is a bearing chamber groove (3), and the bearing mating part (2) is in contact with the outer surface of the bearing (6); The bearing mating part (2) is annular, and a bearing chamber pressure relief groove (5) is provided along the circumference of the bearing mating part (2); the bearing mating part (2) is provided with double rows of bearing chamber pressure relief grooves (5), the inner diameter distance between the bearing chamber pressure relief groove (5) and the bearing mating part (2) is 1 / 5-1 / 3 of the depth of the bearing chamber groove (3), and the outer diameter distance between the bearing chamber pressure relief groove (5) and the bearing mating part (2) is 1 / 2-4 / 5 of the depth of the bearing chamber groove (3).

2. The servo motor end cover bearing housing according to claim 1, characterized in that, The space between the bearing chamber groove (3) and the bearing (6) is filled with thermally conductive colloid.

3. The servo motor end cover bearing housing according to claim 1, characterized in that, The radial width of the bearing chamber pressure relief groove (5) is 0.3 mm.

4. The servo motor end cover bearing housing according to claim 1, characterized in that, The bearing housing body is provided with a washer receiving cavity (4) at one end away from the bearing (6) inlet, and the washer and the washer receiving cavity (4) are either interference fit or clearance fit.

5. The servo motor end cover bearing housing according to claim 4, characterized in that, The axial width of the washer receiving cavity (4) is 0.3-0.5 times the axial width of the bearing (6).

6. The servo motor end cover bearing housing according to claim 5, characterized in that, The radial width of the washer receiving cavity (4) is 0.85-0.92 times the outer diameter of the bearing (6).

7. The servo motor end cover bearing housing according to claim 1, characterized in that, The groove depth of the bearing housing groove (3) is 0.1-0.2 times the inner diameter of the bearing housing body.

8. The servo motor end cover bearing housing according to any one of claims 1 to 7, characterized in that, The bearing mating part (2) and the bearing chamber groove (3) are rounded.

9. A servo motor, comprising an end cover bearing housing, characterized in that, The end cover bearing chamber is the servo motor end cover bearing chamber as described in any one of claims 1 to 8.

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