Motor rotating shaft capable of reducing stress concentration and check ring applied to motor rotating shaft
By opening installation grooves on both sides of the shaft extension section of the motor shaft and using symmetric notched clamps, combining excessive arcs and limit blocks, the brittle fracture problem caused by stress concentration of the motor shaft is solved, and the stability of the motor is improved and the production cost is reduced.
Patent Information
- Application Number
- CN202422559199.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-10-22
AI Technical Summary
The motor shaft is brittle fracture due to concentrated stress at the groove in a low temperature environment, which affects the stability and performance of the motor.
Installation grooves are opened on both sides of the shaft extension section of the motor shaft, and symmetrical notch-like clamps are provided in the grooves, combining excessive arcs and limit blocks to reduce stress concentration, improve stress balance and assembly stability.
It effectively reduces brittle fracture caused by excessive stress concentration of the motor shaft, improves the stability of the motor shaft and reduces production costs, and facilitates the butt and assembly of the retaining ring and the installation groove.
Smart Images
Figure CN223273961U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of motors, and in particular to a motor shaft for reducing stress concentration and a retaining ring applied thereto. Background Art
[0002] The motor shaft and retaining ring are important components of the motor structure. Retaining rings are primarily used to secure components to the motor shaft, preventing them from shifting or falling off during high-speed operation. They can also withstand a certain amount of axial force.
[0003] At present, in order to carry out axial positioning, the rotating shaft of the motor is generally slotted and provided with a retaining ring to ensure the correct axial position of the rotor and prevent the rotor from axial movement during operation. This is crucial to ensuring the stability and performance of the motor. During operation, since the rotating shaft itself needs to bear the weight of the fan blades and the centripetal force after the fan blades rotate, the rotating shaft itself is extremely prone to stress-concentrated brittle fracture in a low-temperature environment because the stress at the slot is much greater than the average stress, resulting in broken shaft. Utility Model Content
[0004] In order to effectively reduce brittle fracture caused by stress concentration at the slots of the shaft, the present application provides a motor shaft that reduces stress concentration and a retaining ring used therefor.
[0005] In the first aspect, the present application provides a motor shaft that reduces stress concentration, comprising a shaft body, a shaft extension section, and a first shaft shoulder, wherein the shaft body, the shaft extension section, and the first shaft shoulder are coaxial, and mounting grooves are provided on opposite sides of the shaft extension section, and the mounting grooves are provided near the connection between the shaft extension section and the motor shaft output member.
[0006] By adopting the above technical solution, installation grooves are opened on opposite sides of the shaft extension section, thereby reducing the cross-sectional area of the retaining ring installation part of the motor shaft, and enabling the stress of the motor shaft to be smoothly transferred at the retaining ring installation part during operation, thereby reducing the large difference between the local stress and the average stress of the motor shaft during operation due to excessive stress concentration, thereby effectively reducing the brittle fracture of the motor shaft after long-term load operation.
[0007] Optionally, the opening direction of the installation groove is perpendicular to the axial direction of the shaft extension section.
[0008] By adopting the above technical solution, the contact surface of the retaining ring installed in the mounting groove can be made flat, thereby reducing the sudden shape change of the retaining ring contact surface, and better reducing the excessive stress concentration at the mounting groove of the motor shaft. At the same time, it can also save the production cost of the retaining ring and facilitate the docking assembly between the retaining ring and the mounting groove.
[0009] Optionally, a second shoulder is provided at the rear end of the shaft body, a third shoulder is provided at the connection between the shaft body and the shaft extension section, and a first annular groove and a second annular groove are respectively provided at the ends of the shaft body close to the second shoulder and the third shoulder, and transition arcs are provided at the inner edges of the first annular groove and the second annular groove.
[0010] Optionally, a shaft head is provided at the front end of the first shaft shoulder, a third annular groove is provided between the shaft head and the first shaft shoulder, and a transition arc is provided at the inner edge of the third annular groove.
[0011] By adopting the above technical solution, the transition arc can better make the transition between the motor shaft and the first annular groove, the second annular groove and the third annular groove smoother, reduce the situation where the stress is too concentrated in the first annular groove, the second annular groove and the third annular groove due to the large difference between the local stress and the average stress during the operation of the motor shaft, and at the same time, reduce the direct sharp contact between the bearing and the groove edge, thereby dispersing the concentrated stress to a larger area, thereby achieving the purpose of reducing the local stress peak.
[0012] Optionally, the groove widths of the mounting groove and the third annular groove are greater than the groove widths of the first annular groove and the second annular groove.
[0013] In a second aspect, the present application further provides a retaining ring comprising a circular ring-shaped sheet-shaped clamping member with a notch, wherein the two sides of the inner notch of the clamping member are symmetrically arranged and respectively abut against two mounting grooves.
[0014] By adopting the above technical solution, the notch-shaped clamping member facilitates quick assembly at the mounting groove of the shaft extension section, and by setting the two sides of the inner notch of the clamping member to a symmetrical structure, it is beneficial to improve the force balance between the clamping member and the mounting grooves on both sides, thereby effectively reducing the shaking of the clamping member when the motor shaft rotates.
[0015] Optionally, an inner notch is provided on the side of the inner notch of the clamping member away from the entry and exit, and both sides of the inner notch are configured to be arc-shaped to improve the fit between the inner notch of the clamping member and the arc surface of the outer wall of the shaft extension section.
[0016] By adopting the above technical solution, the inner recess facilitates adjustment of the opening and closing degree of the clamping member, and the inner side of the clamping member near the two sides of the inner recess is set to an arc shape, which can effectively increase the contact area between the inner wall of the clamping member and the arc surface of the outer wall of the shaft extension section, thereby increasing the static friction between the shaft extension section and the clamping member, and thus achieving the purpose of improving the assembly stability of the clamping member at the installation groove of the shaft extension section.
[0017] Optionally, limiting blocks are symmetrically provided on the entry and exit sides of the inner notch of the clamping member.
[0018] By adopting the above technical solution, the limit block can increase the contact area between the entry and exit sides of the inner notch of the clamping member and the outer wall of the shaft extension section, thereby further improving the connection stability between the clamping member as a whole and the mounting groove, and reducing the impact of excessive axial force on the smooth operation of the output member of the motor shaft.
[0019] In summary, this application includes at least one of the following beneficial technical effects:
[0020] 1. By providing mounting grooves on opposite sides of the shaft extension, the cross-sectional area of the retaining ring installation portion of the motor shaft is reduced, which enables the stress of the motor shaft during operation to be smoothly transferred at the retaining ring installation portion, thereby reducing the large difference between the local stress and the average stress of the motor shaft during operation caused by excessive stress concentration, thereby effectively reducing the brittle fracture of the motor shaft after long-term load operation.
[0021] 2. By making the contact surface of the retaining ring installed in the mounting groove smooth, the sharp shape change of the retaining ring contact surface is reduced, and the excessive stress concentration at the mounting groove of the motor shaft is better reduced. At the same time, it can also save the production cost of the retaining ring and facilitate the docking assembly between the retaining ring and the mounting groove.
[0022] 3. The notch-shaped clamping piece is provided to facilitate quick assembly at the mounting groove of the shaft extension section, and the two sides of the notch inside the clamping piece are provided with a symmetrical structure, which is conducive to improving the force balance between the clamping piece and the mounting grooves on both sides, thereby effectively reducing the shaking of the clamping piece when the motor shaft rotates. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is a schematic diagram of the overall structure of the motor shaft in Example 1 of the present application;
[0024] Figure 2 yes Figure 1 Enlarged view of middle I;
[0025] Figure 3 yes Figure 1 Enlarged view of middle II;
[0026] Figure 4 yes Figure 1 Enlarged view of middle III;
[0027] Figure 5 yes Figure 1 Cross-section of the middle cc plane;
[0028] Figure 6 This is a schematic diagram of the overall structure of the retaining rings of the first and second embodiments of the present application;
[0029] Figure 7It is a schematic diagram of the overall structure of the retaining ring of Example 3 of the present application.
[0030] Explanation of the accompanying drawings: 1. Shaft body; 11. Mounting groove; 2. Shaft extension section; 3. First shaft shoulder; 31. Third annular groove; 4. Second shaft shoulder; 41. First annular groove; 42. Second annular groove; 5. Third shaft shoulder; 6. Shaft head; 7. Clamping part; 71. Inner recess; 72. Limit block; 73. Extension groove. DETAILED DESCRIPTION
[0031] The following is combined with Figure 1-7 This application is described in further detail.
[0032] The present application discloses a motor shaft for reducing stress concentration and a retaining ring used therewith.
[0033] Example 1:
[0034] Reference Figure 1-2 The motor shaft includes a shaft body 1, a shaft extension section 2 and a first shaft shoulder 3. The shaft body 1, the shaft extension section 2 and the first shaft shoulder 3 are coaxial and arranged in sequence. Among them, a plurality of keyways are provided on the outer wall of the shaft body 1 to facilitate the stable assembly of the motor rotor on the shaft body 1. At the same time, a second shaft shoulder 4 is provided at the end of the shaft body 1 away from the shaft extension section 2, and a third shaft shoulder 5 is provided at the end of the shaft extension section 2 away from the first shaft shoulder 3 and connected to the shaft body 1. In order to facilitate the limiting of the bearings respectively mounted on the second shaft shoulder 4 and the third shaft shoulder 5, a first annular groove 41 and a second annular groove 42 are respectively provided at the ends of the shaft body 1 close to the second shaft shoulder 4 and the third shaft shoulder 5.
[0035] During installation, bearings can be installed on the outer walls of the third shoulder 5 and the second shoulder 4 in sequence, and the bearing sleeves outside the two bearings can be clamped tightly into the first annular groove 41 and the second annular groove 42 at the corresponding positions, thereby achieving stable assembly of the bearings on both sides of the corresponding shaft body 1 of the motor shaft.
[0036] Specifically, refer to Figure 1-3 A shaft head 6 is provided at one end of the first shaft shoulder 3 away from the shaft extension section 2 . At the same time, a plurality of key grooves are provided on the surface of the shaft head 6 , and a third annular groove 31 is provided at the connection between the shaft head 6 and the first shaft shoulder 3 .
[0037] During installation, the third annular groove 31 and the multiple keyways on the outer surface of the shaft head 6 can be used to achieve stable assembly of the motor shaft and external parts, thereby further effectively improving the stability of the motor shaft during operation.
[0038] Reference Figure 1-3To effectively reduce stress concentration during motor shaft operation, transition arcs are provided on the inner edges of the first annular groove 41, the second annular groove 42, and the third annular groove 31. Specifically, the provision of transition arcs effectively reduces stress concentration caused by sudden shape changes between the contact surfaces of the bearings and external components mounted on the motor shaft and the inner surfaces of the first annular groove 41, the second annular groove 42, and the third annular groove 31, thereby reducing the risk of the motor shaft fracturing at the first annular groove 41, the second annular groove 42, and the third annular groove 31.
[0039] Reference Figure 1 、 4 -5. To further reduce stress concentration in the shaft extension 2 after the retaining ring is assembled, mounting grooves 11 are symmetrically formed on opposite sides of the shaft extension 2. The orientation of the mounting grooves 11 on both sides is perpendicular to the axis of the shaft extension 2. Furthermore, in this embodiment, the width of the third annular groove 31 and the mounting grooves 11 on both sides is greater than the width of the first annular groove 41 and the second annular groove 42.
[0040] On the other hand, refer to Figure 1 and 6 The first embodiment of the present application further provides a retaining ring comprising a notched, annular, sheet-like clamping member 7, with the two sides of the inner notch of the clamping member 7 being symmetrically arranged. An arcuate inner notch 71 is provided in the inner notch of the clamping member 7, away from the inlet and outlet side, and both sides of the inner side of the clamping member 7 near the inner notch 71 are provided with arcuate transition surfaces.
[0041] At the same time, to further improve the installation fit between the clamping member 7 and the two mounting grooves 11, both sides of the inner portion of the notch of the clamping member 7 are designed to be flat. In addition, limit blocks 72 are provided on both sides of the inner side of the notch of the clamping member 7. The limit blocks 72 have an overall trapezoidal cross-section and are located on the inlet and outlet side of the notch of the clamping member 7.
[0042] Implementation principle: During installation, the notch of the clamping member 7 can be opened appropriately and the shaft extension section 2 can be inserted into the notch of the clamping member 7. Then, the two sides of the notch of the clamping member 7 are respectively fitted and tightened with the mounting grooves 11 on both sides of the shaft extension section 2 until the two limit blocks 72 of the clamping member 7 are respectively tightened against the outer wall arc surface of the shaft extension section 2, thereby realizing the rapid assembly of the retaining ring at the outer wall of the motor shaft.
[0043] Example 2
[0044] The difference between this embodiment and the first embodiment is that, referring to Figure 1 and 6In this embodiment, the inner edges of the mounting grooves 11 are all provided with transition arcs. At the same time, the edges of the planes on both sides of the notch of the clamping member 7 are set as arc transitions, thereby improving the fit between the two sides of the notch of the clamping member 7 and the mounting grooves 11 at the corresponding positions, thereby better reducing the degree of change in the contact surface at the connection between the shaft extension section 2 of the motor shaft and the mounting grooves 11, thereby achieving the purpose of further reducing the stress concentration at the connection between the shaft extension section 2 and the external output parts when the motor shaft is running.
[0045] Example 3
[0046] The difference between this embodiment and the first embodiment is that, referring to Figure 1 and 6 -7. In this embodiment, a plurality of extension grooves 73 are symmetrically provided on both side surfaces of the clamping member 7. At the same time, an annular groove is provided on the inner wall of the notch of the clamping member 7, and both sides of the annular groove are connected to the plurality of extension grooves 73. In addition, the annular groove and the plurality of extension grooves 73 are filled with rubber parts.
[0047] Implementation principle: After the two sides of the notch of the clamping member are respectively pressed against the two mounting grooves 11, the stress generated at the positions of the two mounting grooves 11 when the motor shaft is running can be effectively dispersed through the provided annular groove and multiple extension grooves 73, and the load force and axial force generated by the external output parts on the motor shaft are evenly distributed around the retaining ring, thereby further helping to fix it in place and reduce the risk of the motor shaft breaking.
[0048] The embodiments of this specific implementation method are all preferred embodiments of the present application and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be covered within the scope of protection of the present application.
Claims
1. A motor shaft for reducing stress concentration, comprising a shaft body (1), a shaft extension section (2), and a first shaft shoulder (3), wherein the shaft body (1), the shaft extension section (2), and the first shaft shoulder (3) are coaxial, and characterized in that: Mounting grooves (11) are provided on opposite sides of the shaft extension section (2), and the mounting grooves (11) are provided near the connection between the shaft extension section (2) and the motor shaft output member.
2. The motor shaft for reducing stress concentration according to claim 1, characterized in that: The opening direction of the installation groove (11) is perpendicular to the axial direction of the shaft extension section (2).
3. The motor shaft for reducing stress concentration according to claim 2, characterized in that: A second shaft shoulder (4) is provided at the rear end of the shaft body (1), a third shaft shoulder (5) is provided at the connection between the shaft body (1) and the shaft extension section (2), a first annular groove (41) and a second annular groove (42) are respectively provided at the ends of the shaft body (1) close to the second shaft shoulder (4) and the third shaft shoulder (5), and transition arcs are provided at the inner edges of the first annular groove (41) and the second annular groove (42).
4. The motor shaft for reducing stress concentration according to claim 3, characterized in that: A shaft head (6) is provided at the front end of the first shaft shoulder (3), a third annular groove (31) is provided between the shaft head (6) and the first shaft shoulder (3), and a transition arc is provided at the inner edge of the third annular groove (31).
5. The motor shaft for reducing stress concentration according to claim 4, characterized in that: The groove widths of the mounting groove (11) and the third annular groove (31) are greater than the groove widths of the first annular groove (41) and the second annular groove (42).
6. A retaining ring, applied to a motor shaft for reducing stress concentration as claimed in any one of claims 1 to 5, characterized in that: It comprises a circular ring-shaped sheet-shaped clamping member (7) with a notch, wherein two sides of the inner notch of the clamping member (7) are symmetrically arranged and respectively abut against two mounting grooves (11).
7. A retaining ring according to claim 6, characterized in that: An inner notch (71) is provided on the side of the inner notch of the clamping member (7) away from the inlet and outlet, and both sides of the inner notch (71) are arranged in an arc shape to improve the fit between the inner notch of the clamping member (7) and the arc surface of the outer wall of the shaft extension section (2).
8. The retaining ring according to claim 6, characterized in that: Limiting blocks (72) are symmetrically provided on the entry and exit sides of the inner notch of the clamping member (7).