A gap thermal compensation structure and a rotating device

Abstract

The application discloses a gap thermal compensation structure and a rotating device. The gap thermal compensation structure comprises a shell, a rotating shaft, a bearing and a composite gasket, the rotating shaft is supported on the shell through the bearing, a limiting step is arranged on the shell, the composite gasket is arranged between the limiting step and the bearing; the composite gasket comprises a base, a first gasket and a second gasket, the first gasket is arranged on one side of the base towards the limiting step, and the second gasket is arranged on one side of the base towards the bearing; a gap is arranged between the first gasket and the base, the first gasket expands with the increase of temperature, and fills the gap to abut against one side of the base when the temperature exceeds a preset temperature; and the second gasket abuts against the other side of the base. The gap thermal compensation structure can compensate the gap well, and the composite gasket has high working reliability and is not easy to be damaged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gap compensation, and particularly relates to a gap thermal compensation structure and a rotating device. BACKGROUND

[0002] The main function of a motor is to convert electric energy into mechanical energy to generate driving torque. The motor is widely used in various mechanical devices, and is indispensable in small household appliances and large mechanical equipment. The gasket used in the motor plays an important role in various mechanical devices.

[0003] Generally, the shell of the motor is made of aluminum, and the rotating shaft is made of steel. When the motor is working, the thermal expansion length of the rotating shaft and the thermal expansion length of the motor shell are different due to different temperatures, and the aluminum motor shell expands more. Most motors use a two-end ball bearing fixing method, which is over-positioned, so the thermal expansion of the motor rotor and the shell cannot be compensated. At the same time, when the motor works at high speed and large torque, a higher temperature is generated, and at this time, the gap needs to be smaller to ensure the smooth operation of the motor.

[0004] For the thermal expansion of the motor shell and the rotating shaft, the current common method is to set a gasket in advance at the position where the gap may be generated, and to eliminate the possible gap by the thermal expansion of the gasket. However, since the gasket such as a wave-shaped elastic gasket expands linearly when heated, the thickness change curve of the gasket with temperature and the gap change curve with temperature cannot well coincide. When the temperature is too high, the wave-shaped elastic gasket and other gaskets will be deformed and fail, and the gasket needs to be replaced frequently for the motor with large temperature change. SUMMARY

[0005] The gap thermal compensation structure and the rotating device provided by the embodiments of the present application can well compensate the gap, and the composite gasket has high working reliability and is not easy to be damaged.

[0006] The gap thermal compensation structure provided by the embodiments of the present application comprises a shell, a rotating shaft, a bearing and a composite gasket. The rotating shaft is supported on the shell through the bearing. A limiting step is arranged on the shell. The composite gasket is arranged between the limiting step and the bearing.

[0007] The composite gasket comprises a base, a first gasket and a second gasket. The first gasket is arranged on one side of the base facing the limiting step. The second gasket is arranged on one side of the base facing the bearing.

[0008] The first gasket is provided with a gap between the first gasket and the base, the first gasket expands with temperature rise and fills the gap to abut against one side of the base when the temperature exceeds a preset temperature; and the second gasket abuts against the other side of the base.

[0009] Further, the limiting step is provided with a receiving groove, and the first gasket is installed in the receiving groove.

[0010] Further, the base is provided with a first mounting section on the side facing the limiting step, the first mounting section extends into the receiving groove, and a gap is provided between the end face of the first mounting section and the first gasket.

[0011] The main body of the base abuts against the limiting step.

[0012] Further, the receiving groove is an annular groove provided in the axial direction of the housing, and the first mounting section is an annular cylindrical section.

[0013] Further, the base is provided with a second mounting section on the side facing the bearing, and the second gasket is installed on the second mounting section.

[0014] Further, the second mounting section is an annular cylindrical section, and the outer diameter of the second mounting section is smaller than the outer diameter of the first mounting section.

[0015] Further, the gap thermal compensation structure further comprises a wear-resistant piece, the wear-resistant piece is provided between the second gasket and the bearing, and the second gasket abuts against the bearing through the wear-resistant piece.

[0016] Further, the base is provided with a second mounting section on the side facing the second gasket, and the wear-resistant piece is at least partially installed on the second mounting section.

[0017] Further, the thermal expansion coefficients of the first gasket and the second gasket are different, and / or the thicknesses of the first gasket and the second gasket are different.

[0018] Further, the first gasket and the second gasket are annular rubbers, and / or the wear-resistant piece is a steel ring.

[0019] The embodiments of the present application also provide a rotating device, which comprises the gap thermal compensation structure.

[0020] Compared with some technologies, the present application has the following beneficial effects:

[0021] The gap thermal compensation structure provided by the embodiments of the present application uses a composite gasket to compensate for the gap generated between the shell and the bearing due to temperature generation, and the composite gasket can better fit the change curve of the gap with temperature, that is, the composite gasket can better compensate for the gap. Moreover, when the temperature is relatively low, the gap compensation can be achieved by only the second gasket; when the temperature is relatively high, the gap compensation can be achieved by the first gasket and the second gasket together, and the single gasket will not be subjected to excessive extrusion force due to excessively high temperature, and the first gasket and the second gasket can be repeatedly used for many times, and the working reliability is high and the service life is long.

[0022] The rotating device provided by the embodiments of the present application has the above gap thermal compensation structure, and during the temperature change process, good gap compensation effect can be achieved, and the working reliability of the rotating device is high.

[0023] Other features and advantages of the present application will be described in the subsequent description. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are included to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solutions of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0025] Figure 1 A schematic view of the gap thermal compensation structure described in the embodiments of the present application;

[0026] Figure 2 A schematic view of the gap thermal compensation structure described in the embodiments of the present application; Figure 1 An enlarged view of the composite gasket in the middle.

[0027] Illustration:

[0028] 1-shell, 11-limiting step, 12-receiving groove, 2-rotating shaft, 3-bearing, 4-composite gasket, 41-first gasket, 42-second gasket, 43-base, 431-first mounting section, 432-second mounting section, 433-main body part, 44-wear-resistant part, 5-gap. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present application more clear and understandable, the embodiments of the present application will be described in detail below with reference to the drawings. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0030] The existing single gasket expands linearly with heat and cannot effectively compensate for the difference in thermal expansion between the shell and the rotating shaft due to different materials. At the same time, the bearing pre-tightening force required by the motor at different speeds is different, and the pre-tightening force needs to be adjusted non-linearly, but the pre-tightening force provided by the gasket cannot be adjusted at will. After a certain number of high-low temperature cycles or a certain number of "compression-relaxation" working cycles, the gasket is prone to plastic deformation and failure.

[0031] The embodiment of the present application provides a gap thermal compensation structure, as shown in Figure 1 and Figure 2 The gap thermal compensation structure comprises a shell 1, a rotating shaft 2, a bearing 3 and a composite gasket 4. The rotating shaft 2 is supported on the shell 1 through the bearing 3. The shell 1 is provided with a limiting step 11. The composite gasket 4 is arranged between the limiting step 11 and the bearing 3. The composite gasket 4 comprises a base 43, a first gasket 41 and a second gasket 42. The first gasket 41 is arranged on one side of the base 43 facing the limiting step 11. The second gasket 42 is arranged on one side of the base 43 facing the bearing 3. A gap 5 is arranged between the first gasket 41 and the base 43. The first gasket 41 expands with the increase of temperature and fills the gap 5 to abut against one side of the base 43 when the temperature exceeds a preset temperature. The second gasket 42 abuts against the other side of the base 43.

[0032] The bearing 3 is installed on the rotating shaft 2 and arranged in the shell 1. The rotating shaft 2 rotates in the shell 1. The limiting step 11 of the shell 1 abuts against the bearing 3 to axially limit the bearing 3. The rotating shaft 2 is provided with bearings 3 at both ends. The two bearings 3 abut against two limiting steps 11 on the shell 1 to realize the over-positioning of the rotating shaft 2.

[0033] In the working process, the shell 1 and the rotating shaft 2 both expand and contract with the increase of temperature. Since the materials of the shell 1 and the rotating shaft 2 are different, the thermal expansion coefficient of the shell 1 is greater than that of the rotating shaft 2, that is, a gap is generated at the abutting surface between the limiting step 11 and the bearing 3 with the increase of temperature. In the embodiment of the present application, the composite gasket 4 is arranged between the limiting step 11 and the bearing 3 to compensate for the gap.

[0034] In the early stage of the increase of temperature (i.e. the temperature is relatively low), the first gasket 41 and the second gasket 42 both expand with heat, but since the gap is left between the first gasket 41 and the base 43 during assembly, the first gasket 41 does not abut against the base, and the first gasket 41 does not play a role in gap compensation. The second gasket 42 expands with heat to compensate for the gap.

[0035] In the late stage of the increase of temperature (i.e. the temperature is relatively high), the first gasket 41 has filled the gap and abuts against the base 43 with the expansion of the first gasket 41. At this time, the first gasket 41 and the second gasket 42 jointly compensate for the gap.

[0036] Compared with the gap compensation limited to a single gasket, the gap thermal compensation structure provided by the embodiment of the application uses different numbers of gaskets to perform gap compensation in the early and late stages of temperature rise, so that the length of the composite gasket 4 changes with the temperature more in line with the change of the gap with the temperature, and better gap compensation is achieved, avoiding the situation that the gasket is deformed too much and stressed too large to cause the gasket to fail.

[0037] It should be understood that the embodiment of the application is described by taking "the second gasket 42 plays a role in gap compensation in the early stage of temperature rise, and the first gasket 41 and the second gasket 42 jointly play a role in gap compensation in the late stage of temperature rise" as an example, and in actual application, adjustments can be made, such as: three or more gaskets are provided, different numbers of gaskets jointly play a role in gap compensation in different temperature rise stages, the number and position of the base 43 can be adjusted adaptively, and the application does not limit this.

[0038] In an exemplary embodiment, as shown in Figure 1 and Figure 2 , the limiting step 11 is provided with a receiving groove 12, and the first gasket 41 is installed in the receiving groove 12.

[0039] The limiting step 11 is provided with a receiving groove 12, and the receiving groove 12 is used to accommodate the first gasket 41. The first gasket 41 expands under heat in the receiving groove 12 and abuts against the base 43 when the temperature reaches a preset temperature.

[0040] In an exemplary embodiment, as shown in Figure 1 and Figure 2 , the side of the base 43 facing the limiting step 11 is provided with a first mounting section 431, the first mounting section 431 extends into the receiving groove 12, and a gap is provided between the end face of the first mounting section 431 and the first gasket 41; the main body part 433 of the base 43 abuts against the limiting step 11.

[0041] The first mounting section 431 on the base 43 extends into the receiving groove 12, and a gap is provided between the first mounting section 431 and the first gasket 41, in other words, after the initial assembly is completed, the first gasket 41 does not contact the first mounting section 431 of the base 43, but a gap is left. As the temperature gradually rises during the work process, the first gasket 41 expands to gradually fill the gap and abut against the first mounting section 431, thereby performing gap compensation.

[0042] It should be understood that the specific value of the gap can be adjusted according to actual needs, and then the preset temperature when the first gasket 41 abuts against the base 43 is adjusted.

[0043] In an exemplary embodiment, as shown in Figure 1 and Figure 2As shown, the accommodating groove 12 is an annular groove arranged along the axial direction of the housing 1, and the first mounting section 431 is an annular cylindrical section. The cross section of the accommodating groove 12 is rectangular.

[0044] The first mounting section 431 is an annular cylindrical section, which extends into the annular accommodating groove 12. The annular accommodating groove 12 and the first mounting section 431 are simple and reliable in cooperation, convenient in assembly, and accurate in positioning.

[0045] The first mounting section 431 and the accommodating groove 12 can be gap fit to facilitate installation.

[0046] In an exemplary embodiment, as shown in Figure 1 and Figure 2 The base 43 is provided with a second mounting section 432 on the side facing the bearing 3, and the second gasket 42 is mounted on the second mounting section 432. The second mounting section 432 is an annular cylindrical section, and the outer diameter of the second mounting section 432 is smaller than that of the first mounting section 431.

[0047] The second gasket 42 is sleeved on the annular second mounting section 432, and the outer diameter of the second mounting section 432 is smaller than that of the first mounting section 431. Both the first gasket 41 and the second gasket 42 can be annular gaskets, and their inner diameters and outer diameters are the same.

[0048] In an exemplary embodiment, as shown in Figure 1 and Figure 2 The gap thermal compensation structure further comprises a wear-resistant piece 44, which is arranged between the second gasket 42 and the bearing 3, and the second gasket 42 abuts against the bearing 3 through the wear-resistant piece 44.

[0049] Directly contacting the bearing 3 by the wear-resistant piece 44 can avoid the second gasket 42 from being worn too much during work, improve the working reliability of the second gasket 42, and prolong the service life of the second gasket 42.

[0050] In an exemplary embodiment, as shown in Figure 1 and Figure 2 The base 43 is provided with a second mounting section 432 on the side facing the second gasket 42, and the wear-resistant piece 44 is at least partially mounted on the second mounting section 432.

[0051] Mounting the wear-resistant piece 44 at least partially on the second mounting section 432 fixes the position of the wear-resistant piece 44 relative to the base 43, avoids the wear-resistant piece 44 from sliding during work, avoids damaging the second gasket 42, and ensures the normal work of the composite gasket 4.

[0052] In actual installation, the second gasket 42 is sleeved on the second mounting section 432 first, and then the wear-resistant piece 44 is partially sleeved on the second mounting section 432, and the wear-resistant piece 44 abuts against the second gasket 42.

[0053] In an exemplary embodiment, the first gasket 41 and the second gasket 42 have different thermal expansion coefficients, and / or the first gasket 41 and the second gasket 42 have different thicknesses.

[0054] The first gasket 41 and the second gasket 42 have different thermal expansion coefficients, so as to make the overall temperature change curve of the composite gasket 4 more consistent with the temperature change curve of the gap. The first gasket 41 and the second gasket 42 have different thicknesses, so as to adjust the expansion amount of the first gasket 41 and the second gasket 42, respectively.

[0055] The thermal expansion coefficients of the first gasket 41 and the second gasket 42 can be selected according to the specific shaft 2 and the housing 1.

[0056] Of course, the thermal expansion coefficients and thicknesses of the first gasket 41 and the second gasket 42 can also be set to be the same as needed.

[0057] In an exemplary embodiment, the first gasket 41 and the second gasket 42 are annular rubbers, and / or the wear-resistant part 44 is a steel ring.

[0058] The first gasket 41 and the second gasket 42 are annular rubber gaskets, the wear-resistant part 44 is a steel ring, and the base 43 is steel. The base 43 can also be annular in structure, but the inner diameter and the outer diameter at the first mounting section 431 and the second mounting section 432 are different, for example, the outer diameter of the first mounting section 431 is greater than the outer diameter of the second mounting section 432, the inner diameter of the first mounting section 431 is greater than the inner diameter of the second mounting section 432, and the inner diameter of the first mounting section 431 can be equal to the outer diameter of the second mounting section 432.

[0059] The gap thermal compensation structure provided by the embodiments of the present application not only maintains basic elasticity, but also sets the steel wear-resistant part 44 to ensure strength, so as to realize consistent gap compensation of the transmission or motor at different working temperatures or adjustment according to the pre-tightening force required by the rotating speed. Since the wear-resistant part 44 directly contacts the outer ring of the bearing 3, the overall wear resistance of the composite gasket 4 is also improved. When the temperature is less than the preset temperature (critical temperature), only the expansion volume of the second gasket 42 can compensate the gap; when the temperature reaches the preset temperature (critical temperature), the expansion volumes of the two gaskets can jointly compensate the gap, thereby providing better gap compensation performance.

[0060] In actual operation, the specific steps can include the following steps:

[0061] 1. Obtain the thermal expansion coefficients of the aluminum material of the housing and the steel material of the shaft;

[0062] 2. Obtain the length of the housing and the length of the shaft;

[0063] 3. Obtain the using temperature, calculate the difference after thermal expansion according to the limit temperature, draw the difference-temperature curve of thermal expansion process, and determine the pre-tightening force at the critical temperature;

[0064] 4. Select the material of the first gasket and the second gasket according to the curve in step 3, and calculate the required gasket thickness (volume) and the gap between the first gasket and the base;

[0065] 5. Design the accommodating groove according to the size of the rubber;

[0066] 6. Calculate and test the correction.

[0067] The embodiment of the application further provides a rotating device, which comprises the gap thermal compensation structure.

[0068] The rotating device provided by the embodiment of the application has the gap thermal compensation structure, and can achieve good gap compensation effect during temperature change, and has high working reliability.

[0069] The rotating device can be a motor, a speed reducer or the like.

[0070] In the description in the application, it should be noted that the directions or position relationships indicated by “up”, “down”, “one end”, “one side” and the like are the directions or position relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the indicated structure has a particular direction, is constructed and operated in a particular direction, and therefore cannot be understood as a limitation on the application.

[0071] In the description of the embodiment of the application, unless otherwise explicitly specified and limited, the terms “connection”, “assembly” and “installation” should be understood in a broad sense, for example, the term “connection” can be fixed connection, can be detachable connection, or integral connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements. For those skilled in the art, the specific meanings of the above terms in the application can be understood according to the specific circumstances.

[0072] The embodiments described in the application are exemplary rather than limiting, and it is obvious to those skilled in the art that there can be more embodiments and implementation schemes within the scope of the embodiments described in the application. Although many possible combinations of features are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment can be used with any other feature or element of any other embodiment, or can replace any other feature or element of any other embodiment.

[0073] This application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed herein can also be combined with any conventional feature or element to form a unique technology within the scope of the claims. Any feature or element of any embodiment can also be combined with features or elements from other technology solutions to form another unique technology solution within the scope of the claims. Thus, it will be understood that any of the features shown and / or discussed in this application can be implemented alone or in any appropriate combination. Accordingly, the embodiments are not to be restricted, except as by the appended claims and their equivalents. Additionally, various modifications and changes can be made within the scope of the following claims.

Claims

1. A gap thermal compensation structure, characterized by, The device includes a housing, a rotating shaft, a bearing, and a composite gasket. The rotating shaft is supported on the housing by the bearing. A limiting step is provided on the housing, and the composite gasket is provided between the limiting step and the bearing. The composite gasket includes a base, a first gasket, and a second gasket. The first gasket is disposed on the side of the base facing the limiting step, and the second gasket is disposed on the side of the base facing the bearing. A gap is provided between the first gasket and the base. The first gasket expands as the temperature rises and fills the gap after exceeding a preset temperature to abut against one side of the base. The second gasket abuts against the other side of the base. In the early stage of temperature rise, both the first gasket and the second gasket will expand due to heat. However, since the gap is provided between the first gasket and the base during assembly, the first gasket will not press against the base and will not compensate for the gap. The second gasket expands due to heat and compensates for the gap. In the later stages of temperature rise, as the first gasket expands, it fills the gap and presses against the base. At this point, the first gasket and the second gasket work together to compensate for the gap.

2. The gap heat compensation structure of claim 1, wherein, The limiting step is provided with a receiving groove, and the first gasket is installed in the receiving groove.

3. The gap heat compensation structure of claim 2, wherein, The base is provided with a first mounting section on the side facing the limiting step. The first mounting section extends into the receiving groove, and the gap is provided between the end face of the first mounting section and the first gasket. The main body of the base abuts against the limiting step.

4. The gap heat compensation structure of claim 3, wherein, The receiving groove is an annular groove arranged along the axial direction of the shell, and the first mounting section is an annular cylindrical section.

5. The gap heat compensation structure of claim 3, wherein, The base has a second mounting section on the side facing the bearing, and the second gasket is mounted on the second mounting section.

6. The gap heat compensation structure of claim 5, wherein, The second mounting section is an annular cylindrical section, and the outer diameter of the second mounting section is smaller than the outer diameter of the first mounting section.

7. The gap heat compensation structure of claim 1, wherein, It also includes a wear-resistant component disposed between the second gasket and the bearing, wherein the second gasket abuts against the bearing via the wear-resistant component.

8. The gap thermal compensation structure according to claim 7, characterized in that, The base has a second mounting section on the side facing the second gasket, and the wear-resistant component is at least partially mounted on the second mounting section.

9. The gap thermal compensation structure according to any one of claims 1 to 8, characterized in that, The first gasket and the second gasket have different coefficients of thermal expansion, and / or the first gasket and the second gasket have different thicknesses.

10. The gap thermal compensation structure according to claim 7, characterized in that, The first gasket and the second gasket are annular rubber rings, and / or the wear-resistant component is a steel ring.

11. A rotating device, characterized in that, Includes the gap thermal compensation structure as described in any one of claims 1 to 10.

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