Screw mechanism and equipment

Abstract

This application discloses a lead screw mechanism and device. The device includes a lead screw mechanism comprising a lead screw shaft, a first fixed part, a second fixed part, a first bearing assembly, and a second bearing assembly. A cooling channel is formed on the lead screw shaft. The first fixed part is located at the first end of the lead screw shaft and has a first cooling chamber and a first channel, the first channel communicating with the first cooling chamber. The second fixed part is located at the second end of the lead screw shaft and has a second cooling chamber and a second channel, the second channel communicating with the second cooling chamber. The first bearing assembly is located within the first cooling chamber, and the second bearing assembly is located within the second cooling chamber. The first end of the lead screw shaft rotatably passes through the first cooling chamber, and the second end of the lead screw shaft rotatably passes through the second cooling chamber. The first cooling chamber is connected to the second cooling chamber via the cooling channel. This application solves the problem of bearing deformation due to excessively high temperature in the prior art.

Description

Technical Field

[0001] This application relates to the field of mechanical manufacturing technology, and more specifically, to a lead screw mechanism and equipment. Background Technology

[0002] When the lead screw rotates at high speed, it generates a lot of heat. If the temperature of the lead screw is too high, it will cause thermal deformation and eventually lose its normal working accuracy.

[0003] Existing methods for cooling lead screws involve cooling the exterior with coolant or air, thus lowering the screw's temperature. However, a drawback of this method is that the internal temperature of the lead screw remains too high, causing deformation. Another existing cooling method involves creating cooling channels on the lead screw and circulating coolant within these channels. However, this method struggles to cool the bearings mounted on the lead screw, leading to excessively high bearing temperatures and deformation. Summary of the Invention

[0004] The main objective of this application is to provide a lead screw mechanism and device to at least solve the problem of bearing deformation due to excessive temperature in the prior art.

[0005] According to one aspect of this application, a lead screw mechanism is provided, comprising:

[0006] A lead screw shaft, wherein a cooling channel is provided on the lead screw shaft, the cooling channel extends along the axial direction of the lead screw shaft, and a first opening is provided at a first end of the lead screw shaft, the first opening communicating with the cooling channel, and a second opening is provided at a second end of the lead screw shaft, the second opening communicating with the cooling channel;

[0007] A first fixing part is disposed at the first end of the lead screw shaft. The first fixing part has a first cooling chamber and a first channel, and the first channel communicates with the first cooling chamber.

[0008] The second fixing part is disposed at the second end of the lead screw shaft. The second fixing part has a second cooling chamber and a second channel, and the second channel is connected to the second cooling chamber.

[0009] A first bearing assembly is sleeved on the lead screw shaft and located within the first cooling chamber.

[0010] The second bearing assembly is sleeved on the lead screw shaft and is located in the second cooling chamber.

[0011] The first end of the lead screw shaft rotatably passes through the first cooling chamber, and the second end of the lead screw shaft rotatably passes through the second cooling chamber. The first cooling chamber is connected to the second cooling chamber through the cooling channel.

[0012] Furthermore, the minimum outer diameter D1 of the lead screw shaft and the diameter D2 of the cooling channel satisfy the following relationship: 2.25≤D1 / D2≤4.375, where D2 satisfies the following relationship: 16mm≤D2≤20mm.

[0013] Furthermore, the first fixing part includes a first bearing seat and a first end cap assembly, the first bearing seat and the first end cap assembly are sealed together, and a first locking assembly is provided on the side of the first bearing assembly away from the first bearing seat along the axial direction of the lead screw shaft.

[0014] The first end cap assembly is provided with a first groove, the first bearing seat is provided with a second groove, the first groove and the second groove surround to form the first cooling chamber, the first locking assembly is disposed in the first groove and there is a gap between the first locking assembly and the inner wall surface of the first groove, the first channel communicates with the first groove, and the first bearing assembly is embedded in the second groove.

[0015] Further, the first groove includes a first circular groove along the radial direction of the lead screw shaft, and the minimum distance A between the first locking assembly and the inner wall surface of the first circular groove satisfies the relationship: 24mm ≤ A ≤ 28mm; and / or,

[0016] Along the axial direction of the lead screw shaft, the minimum distance B between the first locking assembly and the inner wall of the first circular groove satisfies the relationship: 13mm≤B≤17mm.

[0017] Furthermore, the second fixing part includes a second bearing seat and a second end cap assembly, the second bearing seat and the second end cap assembly are sealed together, and a second locking assembly is provided on the side of the second bearing assembly away from the second bearing seat along the axial direction of the lead screw shaft;

[0018] The second end cap assembly is provided with a third groove, the second bearing seat is provided with a fourth groove, the third groove and the fourth groove surround to form the second cooling chamber, the second locking assembly is disposed in the third groove and there is a gap between the second locking assembly and the inner wall surface of the third groove, the second channel communicates with the third groove, and the second bearing assembly is embedded in the fourth groove.

[0019] Furthermore, the third groove includes a second circular groove along the radial direction of the lead screw shaft, and the minimum distance C between the second locking assembly and the inner wall surface of the second circular groove satisfies the relationship: 8mm ≤ C ≤ 10mm; and / or,

[0020] Along the axial direction of the lead screw shaft, the minimum distance D between the second locking assembly and the inner wall of the second circular groove satisfies the following relationship: 8mm≤D≤12mm.

[0021] Furthermore, the lead screw mechanism also includes an oil tank, which is connected to the first channel via an oil pipe. The oil tank is equipped with a temperature control component, which is used to regulate the temperature of the oil in the oil tank.

[0022] Furthermore, along the axial direction of the lead screw, a first stop and a first locking assembly are respectively provided on both sides of the first bearing assembly. The first stop abuts against the side wall of the first cooling chamber near the second cooling chamber. The first locking assembly is provided on the side of the first bearing assembly away from the first stop and is sleeved on the outer circumference of the lead screw shaft. The first locking assembly is used to abut against the inner ring of the first bearing assembly so that the outer ring of the first bearing assembly abuts against the first stop.

[0023] Along the axial direction of the lead screw, a second stop and a second locking assembly are respectively provided on both sides of the second bearing assembly. The second stop abuts against the side wall of the second cooling chamber near the first cooling chamber. The second locking assembly is provided on the side of the second bearing assembly away from the second stop and is sleeved on the outer circumference of the lead screw shaft. The second locking assembly is used to abut against the inner ring of the second bearing assembly so that the outer ring of the second bearing assembly abuts against the second stop.

[0024] Furthermore, the first locking assembly includes a first locking member and a third stop member, the third stop member being disposed between the first locking member and the first bearing assembly, the first locking member being movable along the axial direction so that the third stop member abuts against the inner ring of the first bearing assembly;

[0025] The second locking assembly includes a second locking member and a fourth stop member. The fourth stop member is disposed between the second locking member and the second bearing assembly. The second locking member is movable along the axial direction so that the fourth stop member abuts against the inner ring of the second bearing assembly.

[0026] On the other hand, this application also provides a device comprising the aforementioned lead screw mechanism.

[0027] Compared with the prior art, this application has a first cooling chamber and a second cooling chamber respectively provided on the first fixed part and the second fixed part, and a cooling channel is opened on the lead screw shaft. By directing the coolant or cooling oil from the first cooling chamber to the cooling channel and then to the directional flow channel of the second cooling chamber, the first bearing assembly, the lead screw shaft and the second bearing assembly can all obtain a better heat dissipation effect, thereby avoiding the lead screw shaft, the first bearing assembly or the second bearing assembly from getting too hot, which would affect the accuracy of the lead screw mechanism. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 This is a schematic diagram of the lead screw mechanism disclosed in this application;

[0030] Figure 2 This is a cross-sectional view of the lead screw mechanism disclosed in this application;

[0031] Figure 3 for Figure 2 Enlarged schematic diagram of region I;

[0032] Figure 4 for Figure 2 Enlarged schematic diagram of region II;

[0033] Figure 5 This is a partial structural cross-sectional view of the lead screw structure disclosed in this application (excluding the first locking assembly, the second locking assembly, the skeleton oil seal, the first stop member, and the second stop member);

[0034] Figure 6 for Figure 5 Enlarged schematic diagram of region III;

[0035] Figure 7 for Figure 5 Enlarged schematic diagram of region IV in the middle.

[0036] The above figures include the following reference numerals:

[0037] 10. First fixing part; 11. First channel; 12. First cooling chamber; 20. Second fixing part; 21. Second channel; 22. Second cooling chamber; 30. Lead screw shaft; 31. Cooling channel; 32. First opening; 33. Second opening; 40. First bearing assembly; 50. Second bearing assembly; 60. First locking assembly; 61. First locking member; 62. Third stop member; 70. Second locking assembly; 71. Second locking member; 81. First stop member; 82. Second stop member 83. 84. 85. 86. 90. 90. 91. 92. 93. 94. 95. 96. 97. 98. 99. 90. 91. 92. 93. 94. 95. 96. 97. 98. 99. 99. 90 ... Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] 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.

[0040] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. 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 drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0041] See Figures 1 to 7As shown, according to an embodiment of this application, a lead screw mechanism is provided, which includes a lead screw shaft 30, a first fixing part 10, a second fixing part 20, a first bearing assembly 40, and a second bearing assembly 50.

[0042] The lead screw shaft 30 has a cooling channel 31 extending along its axial direction. A first opening 32, connected to the cooling channel 31, is located at the first end of the lead screw shaft 30. A second opening 33, also connected to the cooling channel 31, is located at the second end of the lead screw shaft 30. A first fixing part 10, with a first cooling chamber 12 and a first channel 11 connected to the first cooling chamber 12, is located at the first end of the lead screw shaft 30. A second fixing part 20, with a second cooling chamber 22 and a second channel 21 connected to the second cooling chamber 22, is located at the second end of the lead screw shaft 30. A first bearing assembly 40 is fitted onto the lead screw shaft 30 and located within the first cooling chamber 12. A second bearing assembly 50 is fitted onto the lead screw shaft 30 and located within the second cooling chamber 22. The first end of the lead screw 30 rotatably passes through the first cooling chamber 12, and the second end of the lead screw 30 rotatably passes through the second cooling chamber 22. The first cooling chamber 12 is connected to the second cooling chamber 22 through the cooling channel 31.

[0043] Specifically, the first fixing part 10 and the second fixing part 20 are used to connect to a predetermined device. Coolant or cooling oil is continuously injected into the first channel 11. When the coolant or cooling oil enters the first cooling chamber 12 from the first channel 11, the coolant or cooling oil flows to carry away heat from the first bearing assembly 40, which is located within the first cooling chamber 12. Then, the coolant enters the cooling channel 31 of the lead screw shaft 30 through the first opening 32, thereby carrying away heat from the lead screw under the flow of coolant or cooling oil. Subsequently, the coolant or cooling oil enters the second cooling chamber 22 through the second opening 33, contacting the second bearing assembly 50 and carrying away heat from it. Finally, the coolant or cooling oil flows into other components through the second channel 21. When cooling oil is used to cool the lead screw mechanism, it also lubricates the first bearing assembly 40 and the second bearing assembly 50, thus preventing excessive friction between the bearings and the lead screw shaft 30.

[0044] Compared to existing technologies, this application features a first cooling chamber 12 and a second cooling chamber 22 respectively provided on the first fixing part 10 and the second fixing part 20, and a cooling channel 31 provided on the lead screw 30. By channeling coolant or cooling oil from the first cooling chamber 12 to the cooling channel 31, and then to the directional flow channel of the second cooling chamber 22, the first bearing assembly 40, the lead screw 30, and the second bearing assembly 50 can all achieve better heat dissipation, thereby preventing the lead screw 30, the first bearing assembly 40, or the second bearing assembly 50 from overheating and affecting the accuracy of the lead screw mechanism. It is worth noting that the first end of the lead screw 30 typically needs to be connected to the motor, therefore it needs to pass through the first cooling chamber 12. The second end of the lead screw 30 does not need to be connected to other equipment; therefore, to improve the cooling effect on the lead screw 30, the second end of the lead screw 30 passes through the second cooling chamber 22.

[0045] Furthermore, the minimum outer diameter D1 of the lead screw shaft 30 and the diameter D2 of the cooling channel 31 satisfy the following relationship: 2.25≤D1 / D2≤4.375, where D2 satisfies the following relationship: 16mm≤D2≤20mm.

[0046] In this embodiment, the diameter D2 of the cooling channel 31 is positively correlated with the heat dissipation capacity of the lead screw 30. If D1 / D2 is greater than 4.375, the cooling channel 31 is relatively small compared to the lead screw 30, which leads to uneven heat dissipation of the lead screw 30 by the refrigerant within the cooling channel 31. For example, the outer surface of the lead screw 30 may be difficult to cool down through the refrigerant in the cooling channel 31. Conversely, if D1 / D2 is less than 2.25, the cooling channel 31 is too large relative to the lead screw 30, reducing the transmission stiffness of the lead screw 30 and ultimately making it more prone to deformation. The values ​​of D1 / D2 can be 2.25, 2.5, 2.725, 3, 3.25, 3.5, 3.725, 4, 4.25, and 4.375. The value of D2 can be 16mm, 17mm, 18mm, 19mm, and 20mm.

[0047] Furthermore, the first fixing part 10 includes a first bearing seat 101 and a first end cap assembly 102. The first bearing seat 101 and the first end cap assembly 102 are sealed together. Along the axial direction of the lead screw shaft 30, a first locking assembly 60 is provided on the side of the first bearing assembly 40 away from the first bearing seat 101. The first end cap assembly 102 is provided with a first groove 121, and the first bearing seat 101 is provided with a second groove 122. The first groove 121 and the second groove 122 surround to form a first cooling chamber 12. The first locking assembly 60 is disposed in the first groove 121, and there is a gap between the first locking assembly 60 and the inner wall surface of the first groove 121. The first channel 11 communicates with the first groove 121, and the first bearing assembly 40 is embedded in the second groove 122.

[0048] Specifically, in this embodiment, the first locking component 60 is used to lock the first bearing assembly 40, preventing the first bearing assembly 40 from being subjected to axial force when the lead screw shaft 30 rotates, thus preventing the first bearing assembly 40 from moving axially. The first bearing assembly 40 is embedded in the second groove 122, so that the outer ring of the first bearing assembly 40 abuts against the inner wall surface of the second groove 122, thereby preventing the outer ring of the first bearing assembly 40 from rotating with the lead screw shaft 30 when it rotates. In addition, since there is a gap between the first locking component 60 and the inner wall surface of the first groove 121, and the first opening 32 rotates with the rotation of the lead screw shaft 30, when the refrigerant enters the first groove 121 through the first channel 11, the refrigerant can be stored in the first groove 121 for a certain period of time, thereby increasing the heat transfer time between the refrigerant and the first bearing assembly 40 and the outer surface of the first end of the lead screw shaft 30, and thus improving the cooling effect of the refrigerant on the lead screw mechanism. On the other hand, the first groove 121 is connected to the second groove 122. When the refrigerant is cooling oil, the cooling oil enters the second groove 122, which can not only dissipate heat from the first bearing assembly 40, but also lubricate the first bearing assembly 40.

[0049] Furthermore, the first end cap assembly 102 includes a first flange 1021, a second flange 1022, and a cover plate 1023. The first flange 1021 is fixedly connected to the first bearing housing 101, and a sealing ring 90 is provided between the first flange 1021 and the first bearing housing 101. The second flange 1022 is connected to the end of the first flange 1021 away from the first bearing housing 101, and a sealing ring 90 is also provided between the second flange 1022 and the first flange 1021. The cover plate 1023 is connected to the second flange 1022, and a clearance hole is provided on the cover plate 1023. The clearance hole communicates with the first groove 121 and is used to allow the lead screw shaft 30 to pass through the first cooling channel 31. The second flange 1022 has a first mounting groove 124 on the side near the cover plate 1023. The first mounting groove 124 is embedded with a skeleton oil seal 83, and the skeleton oil seal 83 is sleeved on the outer periphery of the lead screw shaft 30.

[0050] Furthermore, the first groove 121 includes a first circular groove. Along the radial direction of the lead screw shaft 30, the minimum distance A between the first locking assembly 60 and the inner wall surface of the first circular groove satisfies the relationship: 24mm ≤ A ≤ 28mm. Additionally, along the axial direction of the lead screw shaft 30, the minimum distance B between the first locking assembly 60 and the inner wall surface of the first circular groove satisfies the relationship: 13mm ≤ B ≤ 17mm.

[0051] Specifically, the minimum distance A between the first locking assembly 60 and the inner wall of the first circular groove along the radial direction of the lead screw shaft 30, and the minimum distance B between the first locking assembly 60 and the inner wall of the first circular groove along the axial direction of the lead screw shaft 30, are related to the time that the refrigerant can be stored in the first groove 121. That is to say, there is a redundant space between the first circular groove and the first locking assembly 60 so that the refrigerant can be stored in the redundant space. If A is less than 24 mm or B is less than 13 mm, the refrigerant entering the first groove 121 from the first channel 11 will stay in the first groove 121 for too short a time, so that the refrigerant cannot fully contact the outer peripheral surface of the lead screw shaft 30 and the first bearing assembly 40, thereby reducing the heat dissipation effect on the lead screw shaft 30 and the first bearing assembly 40. If A is greater than 28mm or B is greater than 17mm, the first bearing housing 101 and the first end cover assembly 102 need to be larger, that is, the first flange 1021 and the second flange 1022 need to be non-standard parts, resulting in excessively high manufacturing costs for the screw mechanism.

[0052] Furthermore, the second fixing part 20 includes a second bearing seat 201 and a second end cap assembly 202. The second bearing seat 201 and the second end cap assembly 202 are sealed together. Along the axial direction of the lead screw shaft 30, a second locking assembly 70 is provided on the side of the second bearing assembly 50 away from the second bearing seat 201. The second end cap assembly 202 is provided with a third groove 221, and the second bearing seat 201 is provided with a fourth groove 222. The third groove 221 and the fourth groove 222 surround to form a second cooling chamber 22. The second locking assembly 70 is disposed in the third groove 221, and there is a gap between the second locking assembly 70 and the inner wall surface of the third groove 221. The second channel 21 communicates with the third groove 221, and the second bearing assembly 50 is embedded in the fourth groove 222.

[0053] Similarly, the second bearing assembly 50 is embedded in the fourth groove 222, so that the outer ring of the second bearing assembly 50 abuts against the inner wall of the fourth groove 222, thereby preventing the outer ring of the second bearing assembly 50 from rotating when the lead screw shaft 30 rotates. The second locking assembly 70 is used to lock the second bearing assembly 50 to prevent the second bearing assembly 50 from moving along the axial direction of the lead screw shaft 30. When the refrigerant enters the second cooling chamber 22 from the cooling channel 31, there is a certain gap between the second locking member 71 and the inner wall of the third groove 221, that is, the third groove 221 can store a certain amount of refrigerant, thereby increasing the heat exchange time between the refrigerant and the second bearing assembly 50, so as to improve the heat dissipation effect of the refrigerant on the second bearing assembly 50. On the other hand, since the third groove 221 is connected to the fourth groove 222, when the refrigerant is cooling oil, the cooling oil can not only dissipate heat from the second bearing assembly 50, but also lubricate the second bearing assembly 50. In other words, this embodiment, through a simple structural design, can dissipate heat from the lead screw shaft 30, the first bearing assembly 40, and the second bearing assembly 50. Simultaneously, it can lubricate the first bearing assembly 40 and the second bearing assembly 50, thereby preventing excessive friction between the first bearing assembly 40 and the second bearing assembly 50 and the lead screw shaft 30, which could lead to deformation of the first bearing assembly 40 and the second bearing assembly 50. In this embodiment, the second end cap assembly 202 includes a third flange 2021, which is connected to the second bearing seat 201, and a sealing ring 90 is provided between the third flange 2021 and the second bearing seat 201.

[0054] Furthermore, the third groove 221 includes a second circular groove. Along the radial direction of the lead screw shaft 30, the minimum distance C between the second locking assembly 70 and the inner wall surface of the second circular groove satisfies the relationship: 8mm ≤ C ≤ 10mm. Along the axial direction of the lead screw shaft 30, the minimum distance D between the second locking assembly 70 and the inner wall surface of the second circular groove satisfies the relationship: 8mm ≤ D ≤ 12mm.

[0055] Understandably, when C is less than 8mm or D is less than 8mm, the redundant space within the third groove 221 is smaller, meaning the amount of refrigerant that can be stored in the third groove 221 is reduced. This results in the refrigerant not being able to fully contact the lead screw shaft 30 and the second bearing assembly 50, thus reducing the cooling effect of the refrigerant on the lead screw shaft 30 and the second bearing assembly 50. When C is greater than 10mm and D is greater than 12mm, the third flange 2021 cannot be a standard part and needs to be custom-made, leading to excessively high manufacturing costs for the lead screw mechanism. The values ​​of C can be 8mm, 8.5mm, 9mm, 9.5mm, and 10mm, and the values ​​of D can be 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, and 12mm.

[0056] It is worth mentioning that, since the first end of the lead screw 30 needs to pass through the first cooling chamber 12, while the second end of the lead screw 30 passes through the first cooling chamber 12, when the volumes of the first cooling chamber 12 and the second cooling chamber 22 are the same, the heat dissipation capacity of the second end of the lead screw 30 is higher than that of the first end. To improve the heat dissipation capacity of the first end of the lead screw 30, a first flange 1021 needs to be provided on the first bearing seat 101, and the size of the second flange 1022 should be larger than the size of the third flange 2021. That is, the volume of the redundant space for storing refrigerant in the first groove 121 should be larger than the volume of the redundant space for storing refrigerant in the third groove 221. This allows more refrigerant to be stored in the first groove 121 within a certain time, ensuring that the refrigerant is in full contact with the outer surface of the first end of the lead screw 30, thereby improving the heat dissipation effect of the first end of the lead screw 30. Furthermore, in this embodiment, both the first groove 121 and the third groove 221 are configured as circular grooves to increase the redundant volume of the first groove 121 and the third groove 221.

[0057] Furthermore, the lead screw mechanism also includes an oil tank (not shown in the figure), which is connected to the first channel 11 via an oil pipe (not shown in the figure). A temperature control component (not shown in the figure) is provided on the oil tank to regulate the temperature of the oil in the oil tank.

[0058] In actual operation of the lead screw mechanism, the oil tank is connected to the first channel 11 via an oil pipe, allowing oil to enter the first cooling chamber 12 from the first channel 11. In some embodiments, the oil tank also includes a return pipe (not shown in the figure), which connects the second channel 21 and the oil tank. This allows the refrigerant in the second cooling chamber 22 to flow back into the oil tank via the return pipe, thus achieving oil recycling. Furthermore, the oil tank includes a temperature control component to regulate the oil temperature. When the lead screw shaft 30 operates at high speed, the lead screw shaft 30, the first bearing assembly 40, and the second bearing assembly 50 generate excessive heat. The temperature control component can then lower the oil temperature, thereby improving the heat dissipation effect of the lead screw mechanism. On the other hand, when the oil enters the oil tank from the return pipe, the oil temperature flowing into the tank is relatively high. The temperature control component can regulate the oil temperature to prevent the oil circulating into the first cooling chamber 12 from becoming too hot. In some embodiments, the lead screw mechanism further includes a controller and a speed detector. The speed detector is disposed on the lead screw shaft 30 and is used to detect the rotational speed of the lead screw shaft 30. The controller is electrically connected to the speed detector and the temperature control component. When the speed detector detects that the rotational speed of the lead screw is higher than a predetermined value, the controller controls the temperature control component to lower the temperature of the oil in the oil tank. Furthermore, quick-connect couplings are installed on both the first channel 11 and the second channel 21. An oil pipeline connects the quick-connect coupling on the first channel 11 to the oil tank, and a return pipeline connects the quick-connect coupling on the second channel 21 to the oil tank.

[0059] Furthermore, along the axial direction of the lead screw, a first stop 81 and a first locking assembly 60 are respectively provided on both sides of the first bearing assembly 40. The first stop 81 abuts against the side wall of the first cooling chamber 12 near the second cooling chamber 22. The first locking assembly 60 is located on the side of the first bearing assembly 40 away from the first stop 81 and is sleeved on the outer circumference of the lead screw shaft 30. The first locking assembly 60 is used to abut against the inner ring of the first bearing assembly, so that the outer ring of the first bearing assembly abuts against the first stop 81. 1. Along the axis of the lead screw, a second stop 82 and a second locking assembly 70 are respectively provided on both sides of the second bearing assembly 50. The second stop 82 abuts against the side wall of the second cooling chamber 22 near the first cooling chamber 12. The second locking assembly 70 is provided on the side of the second bearing assembly 50 away from the second stop 82 and is sleeved on the outer circumference of the lead screw shaft 30. The second locking assembly 70 is used to abut against the inner ring of the second bearing assembly so that the outer ring of the second bearing assembly abuts against the second stop 82.

[0060] Specifically, when the lead screw shaft 30 rotates, it will extend towards both ends along its own axis after being heated, which will easily cause deformation of the outer peripheral surface of the lead screw and reduce its accuracy. In this embodiment, the first locking component 60 abuts against the inner ring of the first bearing assembly 40, and the outer ring of the first bearing assembly 40 abuts against the first locking member 61; at the same time, the first locking member 61 abuts against the first bearing seat 101. Since the first bearing seat 101 is usually fixed on a predetermined device, according to the reaction force, the first bearing seat 101 will eventually apply an external force to the lead screw shaft 30 in the direction from the second fixing part 20 to the first fixing part 10, so that the first end of the lead screw shaft 30 is subjected to this external force after it extends, thereby preventing deformation of the outer peripheral surface of the lead screw shaft 30. Similarly, the second bearing housing 201 applies an external force to the lead screw shaft 30 along the direction from the first fixed part 10 to the second fixed part 20, so that the second end of the lead screw shaft 30 is stretched and subjected to this external force, thereby preventing deformation of the outer peripheral surface of the lead screw shaft 30. It is worth mentioning that in this embodiment, the first stop 81 is used to prevent the outer ring of the first bearing assembly 40 from directly abutting against the first bearing housing 101, avoiding uneven contact surfaces between the first bearing housing 101 and the first bearing assembly 40, which could lead to damage to the first bearing assembly 40. Similarly, the second stop 82 is also used to prevent uneven contact surfaces between the second bearing assembly 50 and the second bearing housing 201, which could lead to excessive force on a part of the second bearing assembly 50, causing damage to the second bearing assembly 50.

[0061] Furthermore, the first locking assembly 60 includes a first locking member 61 and a third stop member 62, the third stop member 62 being disposed between the first locking member 61 and the first bearing assembly 40, the first locking member 61 being movable along the axial direction so that the third stop member 62 abuts against the inner ring of the first bearing assembly 40; the second locking assembly 70 includes a second locking member 71 and a fourth stop member, the fourth stop member being disposed between the second locking member 71 and the second bearing assembly 50, the second locking member 71 being movable along the axial direction so that the fourth stop member abuts against the inner ring of the second bearing assembly 50.

[0062] In this embodiment, both the third stop 62 and the fourth stop are sleeved on the outer periphery of the lead screw shaft 30. When the first locking member 61 is locked, the third stop 62 abuts against the inner ring of the first bearing assembly 40. Similarly, when the second locking member 71 is locked, the fourth stop abuts against the inner ring of the second bearing assembly 50. At this time, the reaction force exerted by the first bearing seat 101 on the first stop 81 is finally transmitted between the third stop 62 and the first locking member 61. Subsequently, the first locking member 61 transmits the reaction force to the first end of the lead screw shaft 30, thereby preventing the first end of the lead screw shaft 30 from easily deforming after thermal expansion. Similarly, the reaction force exerted by the second bearing seat 201 on the second stop 82 is finally transmitted between the third stop 62 and the first locking member 61. Subsequently, the first locking member 61 transmits the reaction force to the second end of the lead screw shaft 30, thereby preventing the second end of the lead screw shaft 30 from easily deforming after thermal expansion. Of course, in some embodiments, the third stop 62 and the fourth stop may not be provided. The same effect can be achieved by having the first locking member 61 directly abut against the first bearing assembly 40 and the second locking member 71 directly abut against the first bearing assembly 40. On the other hand, the third stop 62 abuts against the inner ring of the first rotor assembly, and the first stop 81 abuts against the outer ring of the first rotor assembly, thereby limiting the first bearing assembly 40. When the first bearing assembly 40 has multiple bearings, the abutting force can reduce the gap between the multiple bearings in the axial direction. Similarly, the second bearing assembly 50 is abutted between the second stop 82 and the fourth stop. When the second bearing assembly 50 includes multiple bearings, the gap between the multiple bearings can be reduced.

[0063] As attached Figure 2 As shown, the first bearing assembly 40 includes four bearings, which are arranged sequentially along the axial direction of the lead screw shaft 30. Along the direction from the first fixed part 10 to the second fixed part 20, the first and second bearings are connected in series, the second and third bearings are arranged back-to-back, and the fourth and third bearings are connected in series. This bearing arrangement in this embodiment can, to a certain extent, prevent the lead screw shaft 30 from moving along its axial direction. Specifically, when the lead screw shaft 30 tends to move along the direction from the second fixed part 20 to the first fixed part 10, the third and fourth bearings will apply a force to the lead screw shaft 30 along the direction from the first fixed part 10 to the second fixed part 20, thereby preventing the lead screw shaft 30 from moving along this direction. Conversely, when the lead screw shaft 30 tends to move along the direction from the first fixed part 10 to the second fixed part 20, the first and second bearings will apply a force to the lead screw shaft 30 along the direction from the second fixed part 20 to the first fixed part 10, thereby preventing the lead screw shaft 30 from moving along its axial direction.

[0064] As attached Figure 3As shown, the second bearing assembly 50 includes three bearings arranged sequentially along the direction from the first fixing part 10 to the second fixing part 20. The first bearing and the second bearing are connected in series, and the second bearing and the third bearing are arranged face to face. Similarly, when the second end of the lead screw shaft 30 tends to move along the direction from the second fixing part 20 to the first fixing part 10, the first bearing and the second bearing will apply a force to the lead screw shaft 30 along the direction from the first fixing part 10 to the second fixing part 20 to prevent the lead screw shaft 30 from moving along the direction from the second fixing part 20 to the first fixing part 10. When the second end of the lead screw shaft 30 tends to move along the direction from the first fixing part 10 to the second fixing part 20, the third fixing part will apply an opposite force to the lead screw shaft 30 to prevent the second end of the lead screw shaft 30 from shifting. It is understandable that, since the first cooling chamber 12 is larger and the second cooling chamber 22 is smaller, the number of bearings in the first bearing assembly 40 should be greater than the number of bearings in the second bearing assembly 50, thereby improving the support of the first bearing assembly 40 for the lead screw shaft 30.

[0065] In some embodiments, a first sealing groove 123 is further provided at the bottom of the second groove 122, and a skeleton oil seal 83 is embedded in the first sealing groove 123. A second sealing groove 223 is provided at the bottom of the fourth groove 222, and a skeleton oil seal 83 is embedded in the second sealing groove 223, thereby preventing refrigerant from flowing out from the gap between the lead screw shaft 30 and the second groove 122 or the fourth groove 222.

[0066] On the other hand, this application also provides a device that includes the lead screw mechanism in the above embodiments. Therefore, this device includes all the technical effects of the lead screw mechanism in the above embodiments. Since the technical effects of the lead screw mechanism have been described in detail above, they will not be repeated here.

[0067] In summary, this application provides a lead screw mechanism and device. The device includes a lead screw mechanism, which comprises a first fixing part 10, a second fixing part 20, a lead screw shaft 30, a first rotor assembly, and a second rotor assembly. By providing a first cooling chamber 12 on the first fixing part 10, a second cooling chamber 22 on the second fixing part 20, and a cooling channel 31 on the lead screw shaft 30, the refrigerant sequentially passes through the first cooling chamber 12, the cooling channel 31, and the second cooling chamber 22 to cool the first rotor assembly, the lead screw shaft 30, and the second rotor assembly. This prevents the lead screw shaft 30, the first rotor assembly, or the second rotor assembly from overheating, which could lead to a decrease in the accuracy of the lead screw mechanism. Furthermore, in this application, there is a gap between the first groove 121 and the first locking assembly 60, and a gap between the second groove 122 and the second locking assembly 70. This allows the refrigerant entering the first groove 121 from the first channel 11 to be stored in the first groove 121 for a certain period of time, and the refrigerant entering the second groove 122 from the cooling channel 31 to be stored in the second groove 122 for a certain period of time. This improves the cooling effect of the refrigerant on the first rotor assembly, the second rotor assembly, and the lead screw shaft 30. On the other hand, this application also includes an oil tank equipped with a temperature control component. The refrigerant is oil, which can dissipate heat from the lead screw mechanism and lubricate the first bearing assembly 40 and the second bearing assembly 50 simultaneously. The temperature of the oil can be adjusted by the temperature control component according to the working conditions of the lead screw shaft 30 to ensure its normal operation.

[0068] 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.

[0069] 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 cannot be construed as limiting the scope of protection of this application.

[0070] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lead screw mechanism, characterized in that, include: A lead screw shaft (30) is provided with a cooling channel (31) extending along the axial direction of the lead screw shaft (30). The first end of the lead screw shaft (30) has a first opening (32) communicating with the cooling channel (31), and the second end of the lead screw shaft (30) has a second opening (33) communicating with the cooling channel (31). A first fixing part (10) is provided at the first end of the lead screw shaft (30). A first cooling chamber (12) and a first channel (11) are provided on the first fixing part (10), and the first channel (11) communicates with the first cooling chamber (12). The second fixing part (20) is disposed at the second end of the lead screw shaft (30). The second fixing part (20) has a second cooling chamber (22) and a second channel (21) and the second channel (21) communicates with the second cooling chamber (22). The first bearing assembly (40) is sleeved on the lead screw shaft (30) and is located in the first cooling chamber (12); The second bearing assembly (50) is sleeved on the lead screw shaft (30) and is located in the second cooling chamber (22); The first end of the lead screw shaft (30) rotatably passes through the first cooling chamber (12), and the second end of the lead screw shaft (30) rotatably passes through the second cooling chamber (22). The first cooling chamber (12) is connected to the second cooling chamber (22) through the cooling channel (31). The first fixing part (10) includes a first bearing seat (101) and a first end cap assembly (102). The first bearing seat (101) is sealed to the first end cap assembly (102). Along the axial direction of the lead screw shaft (30), the first bearing assembly (40) is provided with a first locking assembly (60) on the side away from the first bearing seat (101). The first end cap assembly (102) is provided with a first groove (121). The first bearing seat (101) is provided with a second groove (122). The first groove (121) and the second groove (122) surround and form the first cooling chamber (12). The first locking assembly (60) is disposed in the first groove (121), and there is a gap between the first locking assembly (60) and the inner wall surface of the first groove (121). The first channel (11) communicates with the first groove (121). The first bearing assembly (40) is embedded in the second groove (122).

2. The lead screw mechanism according to claim 1, characterized in that, The minimum outer diameter D1 of the lead screw shaft (30) and the diameter D2 of the cooling channel (31) satisfy the following relationship: 2.25≤D1 / D2≤4.375, where D2 satisfies the following relationship: 16mm≤D2≤20mm.

3. The lead screw mechanism according to claim 1, characterized in that, The first groove (121) includes a first circular groove along the radial direction of the lead screw shaft (30), and the minimum distance A between the first locking assembly (60) and the inner wall surface of the first circular groove satisfies the relationship: 24mm ≤ A ≤ 28mm; and / or, Along the axial direction of the lead screw shaft (30), the minimum distance B between the first locking assembly (60) and the inner wall of the first circular groove satisfies the relationship: 13mm≤B≤17mm.

4. The lead screw mechanism according to claim 1, characterized in that, The second fixing part (20) includes a second bearing seat (201) and a second end cap assembly (202). The second bearing seat (201) and the second end cap assembly (202) are sealed together. Along the axial direction of the lead screw shaft (30), a second locking assembly (70) is provided on the side of the second bearing assembly (50) away from the second bearing seat (201). The second end cap assembly (202) is provided with a third groove (221), the second bearing seat (201) is provided with a fourth groove (222), the third groove (221) and the fourth groove (222) surround to form the second cooling chamber (22), the second locking assembly (70) is disposed in the third groove (221), and the second locking assembly (70) has a gap with the inner wall surface of the third groove (221), the second channel (21) communicates with the third groove (221), and the second bearing assembly (50) is embedded in the fourth groove (222).

5. The lead screw mechanism according to claim 4, characterized in that, The third groove (221) includes a second circular groove along the radial direction of the lead screw shaft (30), and the minimum distance C between the second locking assembly (70) and the inner wall surface of the second circular groove satisfies the relationship: 8mm ≤ C ≤ 10mm; and / or, Along the axial direction of the lead screw shaft (30), the minimum distance D between the second locking assembly (70) and the inner wall of the second circular groove satisfies the relationship: 8mm≤D≤12mm.

6. The lead screw mechanism according to any one of claims 1 to 5, characterized in that, The lead screw mechanism also includes an oil tank, which is connected to the first channel (11) via an oil pipe. The oil tank is equipped with a temperature control component, which is used to adjust the temperature of the oil in the oil tank.

7. The lead screw mechanism according to any one of claims 1 to 5, characterized in that, Along the axial direction of the lead screw, a first stop (81) and a first locking assembly (60) are respectively provided on both sides of the first bearing assembly (40). The first stop (81) abuts against the side wall of the first cooling chamber (12) near the second cooling chamber (22). The first locking assembly (60) is provided on the side of the first bearing assembly (40) away from the first stop (81) and is sleeved on the outer circumference of the lead screw shaft (30). The first locking assembly (60) is used to abut against the inner ring of the first bearing assembly so that the outer ring of the first bearing assembly abuts against the first stop (81). Along the axial direction of the lead screw, a second stop (82) and a second locking assembly (70) are respectively provided on both sides of the second bearing assembly (50). The second stop (82) abuts against the side wall of the second cooling chamber (22) near the first cooling chamber (12). The second locking assembly (70) is provided on the side of the second bearing assembly (50) away from the second stop (82) and is sleeved on the outer circumference of the lead screw shaft (30). The second locking assembly (70) is used to abut against the inner ring of the second bearing assembly so that the outer ring of the second bearing assembly abuts against the second stop (82).

8. The lead screw mechanism according to claim 7, characterized in that, The first locking assembly (60) includes a first locking member (61) and a third stop member (62). The third stop member (62) is disposed between the first locking member (61) and the first bearing assembly (40). The first locking member (61) is movable along the axial direction so that the third stop member (62) abuts against the inner ring of the first bearing assembly (40). The second locking assembly (70) includes a second locking member (71) and a fourth stop member, the fourth stop member being disposed between the second locking member (71) and the second bearing assembly (50), the second locking member (71) being movable along the axial direction so that the fourth stop member abuts against the inner ring of the second bearing assembly (50).

9. A device, characterized in that, The device includes the lead screw mechanism as described in any one of claims 1 to 8.

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