Machining tool for outer circle of motor connecting shaft
Through the combined structure of the inner cone, the outer expansion member and the fastening nut, the expansion sleeve of the outer expansion member is used to achieve stable positioning of the motor joint under the tension of the cone table, which solves the problems of poor processing consistency and difficulty in ensuring concentricity in the prior art, and improves the machining accuracy and concentricity.
Patent Information
- Application Number
- CN202421963356.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-14
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-08-14
AI Technical Summary
The prior art is difficult to stabilize the positioning of the motor joints on the outer cylindrical grinder, resulting in poor machining consistency and difficulty in ensuring concentricity.
The combined structure of the inner cone piece, the outer expansion piece and the fastening nut is adopted. The expansion sleeve of the outer expansion piece expands outward in the radial direction under the tension of the cone table, and is tightened on the inner wall of the motor coupling shaft to achieve stable positioning.
The stable positioning of the motor joint on the outer cylindrical grinder is achieved, the machining accuracy and concentricity are improved, and the concentricity between the outer cylindrical and inner holes of the motor joint is achieved.
Smart Images
Figure CN222920301U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of external cylindrical grinding machine processing, in particular to an external cylindrical processing tool for a motor connecting shaft. Background Art
[0002] The motor output shaft and the impeller are connected by a motor coupling. In order to ensure that the motor output shaft and the impeller rotate concentrically when the motor is running, and to ensure that the runout value of the outer wall surface of the motor coupling is within the limit range, it is necessary to use an external cylindrical grinder to perform external cylindrical processing on the motor coupling with the inner hole processed.
[0003] However, since the inner hole size of the motor coupling is much larger than the size of the grinder's ejector pin, the double ejector pin structure of the cylindrical grinder is unable to position the motor coupling. The existing tooling replaces the ejector pin near the inner hole with an insert shaft whose length is greater than the inner hole depth, and uses the insert shaft and another ejector pin to press the motor coupling onto the grinder. However, when the above tooling is used for grinding, the motor coupling is prone to rotate under the action of the grinding force, resulting in poor machining consistency and difficulty in ensuring the concentricity between the outer circle and the inner hole of the motor coupling. Utility Model Content
[0004] In order to solve the above-mentioned deficiencies of the prior art, the utility model provides a motor shaft external cylindrical processing tooling, which is easy to install, ensures the stable positioning of the motor shaft on the external cylindrical grinder, and improves the processing accuracy and concentricity after processing.
[0005] The technical solution of the utility model is a tooling for machining the outer circle of a motor connecting shaft, comprising an inner cone, an outer expansion piece and a fastening nut, wherein the inner cone comprises a frustum portion and a core shaft fixed at the center of the small-sized end of the frustum portion, a positioning hole cooperating with an ejector pin is provided on the end surface of the core shaft, the outer expansion piece comprises a connecting seat for the core shaft to pass through and an expansion sleeve fixed on the connecting seat and sleeved on the outside of the frustum portion, the fastening nut is threadedly connected to the core shaft passing through the connecting seat and drives the outer expansion piece to move in the direction of the large-sized end close to the frustum portion, and the expansion sleeve is provided with an expansion groove for increasing its diameter under the action of an external force. By putting the external expansion piece on the outside of the inner cone piece, one end of the expansion sleeve of the external expansion piece is inserted into the inner hole of the motor shaft. Under the drive of the fastening nut, the cone part and the expansion sleeve move toward each other, and the expansion sleeve expands outward along the diameter direction under the tension of the cone part, so as to be tightened on the inner wall of the motor shaft. The double ejector pins on the external cylindrical grinder are pressed on the positioning holes of the motor shaft and the core shaft respectively. At this time, the expansion force of the expansion sleeve overcomes the grinding force generated during processing, thereby realizing the stable positioning of the motor shaft on the external cylindrical grinder, and ensuring the concentricity between the outer circle and the inner hole of the motor shaft after processing.
[0006] The inner side of the expansion sleeve has an inner conical surface whose size gradually widens axially towards the open end of the expansion sleeve. The taper of the inner conical surface is the same as that of the frustum portion, and the minimum cross-sectional size of the inner conical surface is smaller than the minimum cross-sectional size of the frustum portion.
[0007] The size of the connecting seat is larger than that of the expansion sleeve, and a bearing surface for supporting the motor connecting shaft is formed on the connecting seat outside the expansion sleeve. The setting of the bearing surface provides lateral support for the inner hole end of the motor connecting shaft, thereby ensuring the axial stability of the motor connecting shaft.
[0008] A boss is fixed at one end of the connecting seat away from the expansion sleeve. The middle of the boss has a slideway communicating with the through portion of the connecting seat, and a rotating shaft portion cooperating with the slideway is provided at a position of the core shaft close to the frustum portion.
[0009] A plurality of loading and unloading planes are circumferentially arranged on the outside of the boss. The setting of the loading and unloading planes enables the boss to cooperate with a wrench, improving the convenience during the use of the tooling.
[0010] An anti-slip gasket is provided on the connecting seat, and the anti-slip gasket is clamped between the fastening nut and the boss.
[0011] The expansion sleeve, the connecting seat, and the boss are coaxially arranged, and the frustum portion, the core shaft, and the positioning hole are coaxially arranged.
[0012] The beneficial effects of the present utility model are as follows: In this solution, the outer expansion sleeve is sleeved outside the inner conical part, and one end of the expansion sleeve of the outer expansion part is inserted into the inner hole of the motor connecting shaft. Under the drive of the fastening nut, the frustum portion and the expansion sleeve move towards each other, and the expansion sleeve expands radially under the tension of the frustum portion, thereby expanding and tightening on the inner wall of the motor connecting shaft. The double center pins on the external cylindrical grinder respectively press against the positioning holes of the motor connecting shaft and the core shaft. At this time, the tightening force of the expansion sleeve overcomes the grinding force generated during processing, thereby realizing the stable positioning of the motor connecting shaft on the external cylindrical grinder and ensuring the concentricity between the outer circle and the inner hole of the motor connecting shaft after processing. Description of the Drawings
[0013] Figure 1 is a schematic structural diagram after the present utility model is connected to the motor connecting shaft;
[0014] Figure 2 is a schematic sectional view of the present utility model;
[0015] Figure 3 is a disassembled schematic diagram of the present utility model.
[0016] Reference numerals: 1, motor coupling shaft; 101, inner hole; 2, center drill; 3, inner taper part; 301, frustum part; 302, mandrel; 303, positioning hole; 304, threaded part; 305, rotating shaft part; 4, outer expansion part; 401, connecting seat; 402, expansion sleeve; 403, expansion groove; 404, bearing surface; 5, fastening nut; 6, boss; 601, loading and unloading plane; 7, anti-slip gasket. Detailed implementation mode
[0017] To enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings. Other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.
[0018] As Figure 1 and Figure 3 shown, the present invention provides a machining fixture for the outer circle of a motor coupling shaft 1, including an inner taper part 3, an outer expansion part 4 and a fastening nut 5. The inner taper part 3 includes a frustum part 301 and a mandrel 302 fixed at the center of the small-diameter end of the frustum part 301. A positioning hole 303 for cooperating with the center drill 2 is formed on the end face of the mandrel 302. The outer expansion part 4 includes a connecting seat 401 through which the mandrel 302 passes and an expansion sleeve 402 fixed on the connecting seat 401 and sleeved outside the frustum part 301. The fastening nut 5 is threadedly connected to the mandrel 302 passing through the connecting seat 401 and drives the outer expansion part 4 to move along the direction close to the large-diameter end of the frustum part 301. An expansion groove 403 is formed on the expansion sleeve 402 to increase its diameter under the action of an external force. This fixture fixes the motor coupling shaft 1 sleeved outside the expansion sleeve 402 by the radial expansion of the expansion sleeve 402 on the outer expansion part 4. Specifically, the inner taper part 3 is inserted into the inner side of the outer expansion part 4. The mandrel 302 of the inner taper part 3 passes through the connecting seat 401 of the outer expansion part 4 and is connected to a fastening bolt. Driven by the fastening nut 5, the frustum part 301 of the inner taper part 3 and the expansion sleeve 402 of the outer expansion part 4 move towards each other. The expansion sleeve 402 expands outward in the diameter direction under the tension of the frustum part 301 and the cooperation of the expansion groove 403, so as to be tightened on the inner wall of the motor coupling shaft 1. At this time, the two center drills 2 on the external cylindrical grinder are respectively pressed against the positioning holes 303 of the motor coupling shaft 1 and the mandrel 302 to complete the machining positioning of the motor coupling shaft 1. The tightening force of the expansion sleeve 402 overcomes the grinding force generated during machining, thereby realizing the stable positioning of the motor coupling shaft 1 on the external cylindrical grinder and ensuring the concentricity between the outer circle and the inner hole 101 of the motor coupling shaft 1 after machining.
[0019] In this embodiment, there are four expansion grooves 403, which are evenly arranged on the outer wall of the expansion sleeve 402 along the circumferential direction. The length of the expansion groove 403 is not less than half of the length of the expansion sleeve 402, and the width of the expansion groove 403 is at least 1 mm.
[0020] Further preferably, as Figure 2 shown, the inner side of the expansion sleeve 402 has an inner conical surface that gradually widens in the axial direction towards the open end of the expansion sleeve 402. The taper of the inner conical surface is the same as that of the frustum portion 301, and the minimum cross-sectional dimension of the inner conical surface is smaller than the minimum cross-sectional dimension of the frustum portion 301. The inner hole 101 of the expansion sleeve 402 is designed as a conical hole with the same taper as that of the frustum portion 301, ensuring the tight combination between the frustum portion 301 and the expansion sleeve 402 when the inner conical member 3 and the outer expansion member 4 move towards each other. To a certain extent, it makes the expansion sleeve 402 easy to expand radially and improves the operability of the tooling. Specifically, the size of the inner hole 101 of the motor connecting shaft 1 to be fixed is within the range of 65 (-0.08 - 0.1) mm. In this tooling, the outer diameter size of the expansion sleeve 402 is within the range of 65 (-0.12 ~ -0.14) mm, and the single-sided taper of the inner conical surface and the frustum portion 301 is 5°. After the fastening nut 5 is threadedly connected to the threaded portion 304 at the end of the mandrel 302 and is in contact with the connecting seat 401, only a short stroke of turning 1 - 2 threads is required to complete the expansion and fixation of the expansion sleeve 402.
[0021] Further preferably, as Figure 2 shown, in order to provide lateral support to the inner hole 101 end of the motor connecting shaft 1 and thus ensure the axial stability of the motor connecting shaft 1, the size of the connecting seat 401 is larger than that of the expansion sleeve 402, and a bearing surface 404 for supporting the motor connecting shaft 1 is formed on the connecting seat 401 outside the expansion sleeve 402.
[0022] A boss 6 is fixed at one end of the connecting seat 401 away from the expansion sleeve 402. The middle of the boss 6 has a slideway communicating with the through portion of the connecting seat 401. A rotating shaft portion 305 matching the slideway is provided at the position of the mandrel 302 close to the frustum portion 301; further preferably, the expansion sleeve 402, the connecting seat 401, and the boss 6 are coaxially arranged, and the frustum portion 301, the mandrel 302, and the positioning hole 303 are coaxially arranged; to ensure that during the process of the fastening nut 5 driving the inner conical member 3, the inner conical member 3 always moves axially to ensure the concentricity of machining. Specifically, after the outer expansion member 4 is sleeved on the inner conical member 3, the concentricity among the expansion sleeve 402, the mandrel 302, and the positioning hole 303 reaches within 0.02 mm.
[0023] Preferably, the cross-sectional dimension of the boss 6 is not less than the cross-sectional dimension of the fastening nut 5 to provide a pressure-bearing support for the fastening nut 5 during locking and driving. Further, a plurality of loading and unloading planes 601 are circumferentially formed on the outside of the boss 6, making the boss 6 form a clamping portion for the wrench to cooperate with, thereby improving the convenience of using the tooling.
[0024] To avoid the phenomenon of thread slipping during the subsequent tightening of the fastening nut 5 after the threaded connection between the fastening nut 5 and the threaded portion 304 of the mandrel 302 is tightened against the connecting seat 401, an anti-slip gasket 7 is provided on the connecting seat 401, and the anti-slip gasket 7 is clamped between the fastening nut 5 and the boss 6, thereby ensuring the fastening of the fastening nut 5.
[0025] When implementing this technical solution, the mandrel 302 of the inner cone member 3 is oriented towards the opening side of the expansion sleeve 402, inserted into the slideway opened in the middle of the connecting seat 401 and threadedly connected to the fastening nut 5 to complete the pre-connection of the tooling. One end of the expansion sleeve 402 in the pre-connected tooling is inserted into the inner hole 101 of the motor connecting shaft 1 until the end of the motor connecting shaft 1 contacts the bearing surface 404 of the connecting seat 401. Then, the fastening nut 5 is further tightened to cause the expansion sleeve 402 to expand radially under the drive of the frustum portion 301, thereby being fastened to the inner wall of the inner hole 101 of the motor connecting shaft 1 to complete the assembly of the tooling and the motor connecting shaft 1. The motor connecting shaft 1 equipped with the tooling is placed on an external cylindrical grinder, and the two center points 2 on the external cylindrical grinder are respectively pressed against the positioning holes 303 on the end faces of the motor connecting shaft 1 and the mandrel 302 to complete the machining positioning of the motor connecting shaft 1 on the external cylindrical grinder. During machining, the grinding force generated by the grinding tool on the outside of the electrode connecting shaft is offset by the expansion force formed by the expansion sleeve 402 on the inside of the motor connecting shaft 1, thereby ensuring the stable machining of the motor connecting shaft 1, effectively improving the machining accuracy and the concentricity between the outer circle and the inner hole of the motor connecting shaft 1 after machining. At the same time, the tooling can realize the repeated positioning of the batch of motor connecting shafts 1, ensuring the consistency of the machining of the same batch of motor connecting shafts 1.
Claims
1. A motor shaft outer circle machining tool, characterized in that: It includes an inner cone, an outer expansion piece and a fastening nut. The inner cone includes a frustum and a core shaft fixed at the center of the small-sized end of the frustum. A positioning hole cooperating with the ejector is provided on the end face of the core shaft. The outer expansion piece includes a connecting seat for the core shaft to pass through and a clamping sleeve fixed on the connecting seat and sleeved on the outside of the frustum. The fastening nut is threadedly connected to the core shaft passing through the connecting seat and drives the outer expansion piece to move in the direction of the large-sized end close to the frustum. The clamping sleeve is provided with an expansion groove for increasing its diameter under the action of external force.
2. The motor shaft outer circle machining tool according to claim 1, characterized in that: The inner side of the expansion sleeve has an inner conical surface which gradually widens along the axial direction toward the opening end of the expansion sleeve. The taper of the inner conical surface is the same as the taper of the frustum portion, and the minimum dimension of the cross section of the inner conical surface is smaller than the minimum dimension of the cross section of the frustum portion.
3. A motor shaft outer circle machining tool according to claim 1 or 2, characterized in that: The size of the connecting seat is larger than that of the expansion sleeve, and a bearing surface for supporting the motor connecting shaft is formed on the connecting seat outside the expansion sleeve.
4. A motor shaft outer circle machining tool according to claim 1 or 2, characterized in that: A boss is fixed to one end of the connection seat away from the expansion sleeve, the middle of the boss has a slideway connected to the through-hole of the connection seat, and the core shaft has a rotating shaft part matched with the slideway at a position close to the frustum part.
5. The motor shaft outer circle machining tool according to claim 4, characterized in that: A plurality of loading and unloading planes are provided on the outer side of the boss along the circumferential direction.
6. The motor shaft outer circle machining tool according to claim 4, characterized in that: The connecting seat is provided with an anti-skid gasket, and the anti-skid gasket is clamped between the fastening nut and the boss.
7. The motor shaft outer circle machining tool according to claim 4, characterized in that: The expansion sleeve, the connecting seat and the boss are coaxially arranged, and the frustum portion, the core shaft and the positioning hole are coaxially arranged.