Motor end cover for air conditioner drainage pump

Abstract

This invention discloses a motor end cover for an air conditioner drain pump, comprising: end cover one and end cover two disposed at both ends of the motor housing; each end cover one and end cover two is provided with a ball bearing and a bearing mounting component, the ball bearing being fixed within end cover one and end cover two by the bearing mounting component. This invention installs ball bearings within end cover one and end cover two respectively via bearing mounting components, achieving an automatic self-aligning effect. This design effectively compensates for axial misalignment caused by assembly errors or thermal deformation, avoids bearing jamming caused by stress concentration in traditional end cover structures, significantly reduces vibration and noise during motor operation, and simultaneously distributes axial load, extending overall mechanical life. By performing precision machining on the three end faces in a single clamping operation, the concentricity range is controlled within 0.02, greatly improving the machining accuracy of the motor end cover, further reducing vibration and noise during motor operation, and significantly improving user comfort.

Description

Technical Field

[0001] This utility model belongs to the field of motor equipment technology, specifically relating to a motor end cover for an air conditioner drain pump. Background Technology

[0002] An electric motor is a device that converts electrical energy into mechanical energy. It utilizes a current-carrying coil to generate a rotating magnetic field, which acts on the rotor, creating magnetoelectric torque. It mainly consists of a stator and a rotor. The direction of the force exerted on a current-carrying conductor in a magnetic field depends on the direction of the current and the direction of the magnetic field lines. The working principle of an electric motor is that the magnetic field exerts a force on the current, causing the motor to rotate.

[0003] Traditional air conditioning water pump motors generally use a fixed bearing end cover design, which has the following technical defects: First, the axial vibration of the motor during operation is directly transmitted to the bearing, leading to accelerated bearing wear and reduced service life. Second, existing end covers lack a vibration buffering mechanism, which can easily cause bearing seizure when the water pump load changes suddenly, resulting in high maintenance frequency. Furthermore, in existing technology, motor end covers are generally formed by one-piece stamping. Stamped motor end covers have low precision, and the stamping process can easily cause some deformation of the motor end cover, further reducing its precision. This makes it impossible to guarantee the parallelism of the inner and outer end faces and the concentricity of the mounting holes after the motor and end cover are assembled, resulting in motor output shaft eccentricity and poor assembly during motor assembly. This leads to noise and wear problems when the motor shaft rotates, affecting motor performance and operational stability. Utility Model Content

[0004] The purpose of this utility model is to solve the above-mentioned technical problems existing in the prior art, and to provide a motor end cover for an air conditioner drain pump. By setting end cover one and end cover two at both ends of the motor, and setting ball bearings in both end cover one and end cover two, the ball bearings are installed in end cover one and end cover two respectively by bearing mounting parts. The setting of ball bearings achieves the effect of automatic self-alignment, avoiding the occurrence of motor jamming, burning out and other phenomena, and improving the service life of the motor. In terms of processing technology, compared with the one-piece stamping forming of the prior art, this application obtains the blank by die casting, and then performs precision machining on end face one and end face two for end cover assembly and end face three for motor shaft and ball bearing assembly in the blank by turning equipment, controlling the concentricity range within 0.02, which greatly improves the processing accuracy of motor end cover. At the same time, the turning equipment can realize batch precision machining of blank. By placing ball bearings, compression springs and annular pressure plates in the mounting cavity in sequence, and finally fixing them by riveting, the processing of end cover is completed. The riveting fixing method reduces the investment of fixing parts, reduces processing costs, and makes the motor end cover structure simple and easy to assemble.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An end cover for an air conditioner drain pump motor includes: an end cover one and an end cover two disposed at both ends of the motor housing; each end cover one and end cover two is provided with a ball bearing and a bearing mounting component, and the ball bearing is fixed in the end cover one and end cover two by the bearing mounting component. This utility model, by setting end cover one and end cover two at both ends of the motor, with each end cover one and end cover two equipped with a ball bearing, and the ball bearings being mounted in the end cover one and end cover two respectively by the bearing mounting component, achieves a self-aligning effect. This design can effectively compensate for axial misalignment caused by assembly errors or thermal deformation, avoid bearing jamming caused by stress concentration in traditional end cover structures, significantly reduce vibration and noise during motor operation, and simultaneously distribute axial load, extending the overall mechanical life.

[0006] Furthermore, one end of the end cap has a protrusion forming a convex portion, and the other end of the end cap has an open mounting cavity. The convex portion passes through a shaft hole, which is connected to the mounting cavity. The shaft hole matches the motor shaft, and the ball bearing is fixedly connected to the mounting cavity through a bearing mounting component. The convex portion of the end cap and the mounting cavity form a stepped shaft hole structure, through which the motor shaft passes to rotate.

[0007] Furthermore, one end of the second end cover has a protrusion forming a second protrusion, and the other end of the second end cover has an open mounting cavity second. The second protrusion has a second shaft hole, which does not penetrate the second protrusion but is connected to the second mounting cavity second. The second shaft hole matches the motor shaft, and the ball bearing is fixedly connected to the second mounting cavity second through a bearing mounting component. The second protrusion of the second end cover adopts a semi-closed shaft hole design, which, together with the first end cover, forms a stable support system for the motor shaft.

[0008] Furthermore, both shaft hole one and shaft hole two have flared ends near the corresponding mounting cavities one and two, respectively. The end of the ball bearing is pressed against the flared end by the bearing mounting component. The guide slope formed at the flared end facilitates the rapid positioning of the ball bearing, while the opening design of the mounting cavity provides operating space for subsequent assembly.

[0009] Furthermore, an oil felt is fitted onto the outer side of the ball bearing. The bearing mounting component rests against the side of the oil felt away from mounting cavity one and mounting cavity two. After absorbing lubricating oil, the oil felt lubricates the ball bearing. The oil felt fitted onto the outside of the ball bearing is made of annular sponge pad material, and continuous slow-release lubrication is achieved through an oil injection process. This solution overcomes the limitation of traditional grease lubrication requiring regular maintenance. The oil felt can both absorb lubricating oil to form an oil reservoir and evenly penetrate into the bearing raceway through capillary action. It can maintain a stable oil film thickness even under high-speed rotation conditions, significantly reducing the coefficient of friction and minimizing metal fatigue damage.

[0010] Furthermore, the bearing mounting component includes a compression spring and an annular pressure plate. The compression spring abuts against the other end of the ball bearing, allowing the ball bearing to be movably connected within corresponding mounting cavities one and two. The annular pressure plate is fixedly connected to the openings of corresponding mounting cavities one and two, pressing against the side of the compression spring away from the ball bearing. The annular pressure plate exerts pressure on the compression spring, and this spring configuration achieves the self-aligning effect of the ball bearing.

[0011] Furthermore, the compression spring includes an annular base plate and claw portions. The claw portions are distributed circumferentially along the inner edge of the annular base plate and abut against the other end of the ball bearing. End cap one and end cap two abut against the corresponding annular base plates. The compression spring composed of the annular base plate and claw portions can provide a stable axial preload and allow the ball bearing to automatically rebound when there is a small radial displacement. It effectively absorbs dimensional changes caused by temperature changes or load fluctuations, avoids stress concentration problems caused by rigid connections, and achieves the self-aligning effect of the ball bearing.

[0012] Furthermore, the claw portion includes a transition connecting section and an abutting deformation section. The transition connecting section is bent at an angle along the inner edge of the annular base plate towards the end away from the ball bearing, and the abutting deformation section is bent along the transition connecting section towards the end away from the annular base plate. The abutting deformation section presses against the ball bearing. Through the combined bending design of the transition connecting section and the abutting deformation section, a progressive elastic support for the ball bearing is formed.

[0013] Furthermore, both mounting cavities 1 and 2 have slots at their openings, which are matched with annular pressure plates. A through-hole runs through the center of the annular pressure plate, matching the ball bearing and claw. The openings are riveted by a servo press to form circumferentially distributed grooves. A riveting block extends from the bottom of the grooves towards the center of the opening, limiting the annular pressure plate within the groove. The slots at the mounting cavity openings and the annular pressure plate form a precise fit. The circumferential grooves formed by the servo press and the radially extending riveting block achieve the limiting installation of the ball bearing and the compression spring. This design not only provides axial preload to eliminate bearing clearance but also creates a permanent mechanical limit through the plastic deformation of the riveting block, effectively preventing the annular pressure plate from loosening under vibration. The matching design of the through-hole with the bearing and claw further optimizes the force transmission path, ensuring the elastic force of the compression spring acts evenly on the ball bearing, significantly improving the dynamic stability and impact resistance of the motor during high-speed operation.

[0014] A manufacturing process for a motor end cover for an air conditioner drain pump includes the following steps: a. Raw material manufacturing First, blanks for end cap one and end cap two are obtained by die casting. End face one, end face two and end face three are formed on the blanks. b. Finishing by turning By performing precision turning on end faces one, two, and three of the blank, the concentricity error of end faces one and two on the same end face three is ensured to be within 0.02, thus producing end cap one and end cap two. c. Assembly Place the openings of end cap one and end cap two facing upwards, and then place the ball bearings into the corresponding flared openings of end cap one and end cap two respectively. d. Press-fitting First, the compression spring is placed on the ball bearing, then the annular pressure plate is placed on the compression spring. The openings of end cover one and end cover two are riveted using a riveting device, so that the annular pressure plate is fixed at the opening, thus completing the processing of the motor end cover.

[0015] Furthermore, in step b, the turning equipment can be a CNC lathe or a machining center for turning operations, employing a single-clamping machining method. The loading assembly controls the corresponding protrusions one and two of end cover one and end cover two to be clamped at the clamping head. The turning equipment is equipped with a tool holder, which has three corresponding turning tools installed for end face one, end face two, and end face three, respectively. By controlling the three corresponding turning tools, end face one, end face two, and end face three are turned respectively. By using a single-clamping process with a CNC lathe or machining center, the turning operations of end face one, end face two, and end face three are completed synchronously through a precision spindle system, eliminating the cumulative datum error caused by multiple clamping operations and greatly improving the machining accuracy of the motor end cover concentricity.

[0016] Furthermore, in step b, the turning equipment is equipped with a loading assembly, a clamping assembly, and an unloading assembly. The loading assembly transports the blanks one by one to the clamping assembly. The clamping assembly controls the blanks to be clamped one by one through the clamping head. After turning is completed, the unloading assembly removes the finished blanks from the clamping head. The clamping assembly and the unloading assembly are operated by a robotic arm. The setup of the loading assembly, clamping assembly, and unloading assembly enables batch turning of end cap one and end cap two, greatly improving processing efficiency.

[0017] Furthermore, the feeding assembly employs a vibratory feeder and a conveyor channel. The vibratory feeder controls the blanks to be fed one by one into the conveyor channel, which has a C-shaped structure. The conveyor channel includes a conveying groove and a positioning groove. The positioning groove is connected to the conveying groove and is located on the side away from the vibratory feeder. The diameter of the conveying groove is matched with that of the blank, and the positioning groove is matched with protrusion one and protrusion two, so that the blanks fed into the conveyor channel are located in the conveying groove, and protrusion one and protrusion two of the blank are located in the positioning groove, facing away from the vibratory feeder. The vibratory feeder of the feeding assembly, in conjunction with the C-shaped conveyor channel, utilizes the geometric constraints of the positioning groove on the protrusions of the blank to achieve automatic orientation and posture calibration of the blanks.

[0018] Furthermore, in step c, after the ball bearing is placed, an annular sponge pad is installed, and lubricating oil is injected into the annular sponge pad using an oiling machine to produce an oil felt. The oil felt formed after the annular sponge pad is impregnated by the oiling machine ensures a sustained release of lubricating oil while avoiding increased bearing resistance caused by excessive grease. The design of the compression spring pressing against the oil felt creates a constant lubrication pressure field, allowing the grease to form a uniform oil film on the bearing.

[0019] Furthermore, in step d, the riveting equipment can use a servo press to complete the riveting. The servo press includes a frame, a worktable, a working die, an upper die, and an upper cylinder. The worktable is fixedly connected to the bottom of the frame, and the frame is equipped with an upper cylinder. The output end of the upper cylinder is fixedly connected to the upper die, and the working die is fixedly connected to the worktable corresponding to the upper die, located below the upper die. The specific steps of the servo press riveting are as follows: First, the assembled workpiece is placed on the working die, aligned with the upper die, and the upper cylinder is controlled to drive the upper die to press down to complete the riveting action. Through the precise cooperation between the upper die and the working die, the servo press and the precise pressing action of the upper cylinder can ensure that the annular pressure plate and the end cap opening form uniform plastic deformation, avoiding the stress concentration problem that may occur in traditional stamping processes. The extension of the riveting block formed by riveting improves the connection strength, ensuring that the bearing assembly maintains structural stability during high-speed operation.

[0020] Furthermore, in step c, the assembled workpiece is placed in a transfer plate and centrally transported to the riveting equipment for riveting fixation. The transfer plate has a plate body with evenly distributed placement holes, which are matched with protrusions one and two. This matching design of the placement holes and protrusions on the transfer plate uses geometric constraints to fix the workpiece's posture, avoiding collisions and shifts during transport. The evenly distributed layout of the plate body enables multi-station parallel processing, which, combined with an automated conveyor system, significantly improves assembly efficiency. This design protects the precision-machined surfaces of the end cap from scratches and ensures consistent workpiece positioning during the riveting process.

[0021] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects: This invention features end caps 1 and 2 at both ends of the motor, each equipped with a ball bearing. The ball bearings are mounted within end caps 1 and 2 via bearing mounting components. This ball bearing design achieves self-alignment, effectively compensating for axial misalignment caused by assembly errors or thermal deformation. It avoids bearing jamming caused by stress concentration in traditional end cap structures, significantly reducing vibration and noise during motor operation, while also distributing axial load and extending overall mechanical life.

[0022] In the processing technology of this utility model, compared with the one-piece stamping forming of the prior art, the blank is obtained by die casting. The end face 1 and end face 2 used for end cover assembly and the end face 3 used for motor shaft and ball bearing assembly are precision machined by turning equipment. The concentricity is controlled within 0.02, which greatly improves the processing accuracy of motor end cover. At the same time, the turning equipment can realize batch precision machining of blank. By placing ball bearing, compression spring and annular pressure plate in the mounting cavity in sequence, and finally fixing by riveting, the processing of end cover is completed. The riveting method reduces the investment of fasteners, reduces processing costs, and makes the motor end cover structure simple and easy to assemble.

[0023] In step d of this invention, the riveting equipment can use a servo press to complete the riveting. The servo press includes a frame, a worktable, a working die, an upper die, and an upper cylinder. The worktable is fixedly connected to the bottom of the frame, and the frame is equipped with an upper cylinder. The output end of the upper cylinder is fixedly connected to the upper die, and the working die is fixedly connected to the worktable corresponding to the upper die, located below the upper die. The specific steps of the servo press riveting are as follows: First, place the workpiece assembled in step c on the working die, align it with the upper die, and control the upper cylinder to drive the upper die to press down to complete the riveting action. Through the precise cooperation between the upper die and the working die, the servo press and the precise pressing action of the upper cylinder can ensure that the annular pressure plate and the end cap opening form uniform plastic deformation, avoiding the stress concentration problem that may occur in traditional stamping processes. The extension of the riveting block formed by riveting improves the connection strength, ensuring that the bearing assembly maintains structural stability during high-speed operation.

[0024] In step b of this invention, the turning equipment can be a CNC lathe or a machining center for turning operations, employing a single-clamping machining method. The loading assembly controls the corresponding protrusions one and two of end cover one and end cover two to be clamped at the clamping head. The turning equipment is equipped with three corresponding turning tools for end face one, end face two, and end face three, respectively. By controlling the three corresponding turning tools, end face one, end face two, and end face three are turned respectively. Using a single-clamping process with a CNC lathe or machining center, the turning operations of end face one, end face two, and end face three are completed synchronously through a precision spindle system, eliminating the cumulative error of the reference caused by multiple clamping operations and greatly improving the machining accuracy of the motor end cover concentricity. The turning equipment is equipped with a loading assembly, a clamping assembly, and an unloading assembly. The loading assembly is used to transport the blanks one by one to the clamping assembly. The clamping assembly controls the blanks to be clamped one by one through the clamping head. After turning is completed, the unloading assembly removes the finished blanks from the clamping head. The clamping assembly and the unloading assembly are operated by a robotic arm. The setup of the feeding assembly, clamping assembly, and unloading assembly enables batch turning of end cap one and end cap two, greatly improving processing efficiency. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a motor for an air conditioner drain pump according to the present invention; Figure 2 This is a schematic diagram of the structure at the bottom of the motor in this utility model; Figure 3 This is a schematic diagram of the structure of the connection between the end cap of this utility model and the ball bearing and the ball bearing mounting component; Figure 4 This is a schematic diagram of the structure of the second end cap of this utility model; Figure 5 This is a schematic diagram of the compression spring in this utility model; Figure 6 This is a schematic diagram of the structure of the middle end cover of this utility model; Figure 7 This is an exploded view of the motor end cover in this utility model; Figure 8 This is a cross-sectional view of the middle end cover of this utility model; Figure 9 This is a schematic diagram of the turning equipment in this utility model; Figure 10 This is a schematic diagram of the structure of the back of the turning equipment in this utility model; Figure 11 This is a schematic diagram of the conveying channel in this utility model; Figure 12 This is a schematic diagram of the oil injection machine in this utility model; Figure 13 This is a schematic diagram of the structure of the turnover plate in this utility model; Figure 14 This is a schematic diagram of the structure of the separator strip in this utility model.

[0026] In the diagram, 1-End cover one; 2-End cover two; 3-Ball bearing; 4-Bearing mounting part; 5-Motor shaft; 6-Protrusion one; 7-Mounting cavity one; 8-Shaft hole one; 9-Protrusion two; 10-Mounting cavity two; 11-Shaft hole two; 12-Flanged opening; 13-Roofing felt; 14-Compression spring; 15-Annular pressure plate; 16-Annular base plate; 17-Claw part; 18-Transition connection section; 19-Abutment deformation section; 20-Slot; 21-Through hole; 22-Pressure groove; 23-Riveting block; 24- 25-End face 1; 26-End face 2; 27-Turns equipment; 28-Feeding assembly; 29-Clamping assembly; 30-Unloading assembly; 31-Vibrating plate; 32-Conveying channel; 33-Conveying trough; 34-Positioning trough; 35-Oil injection machine; 36-Servo press; 37-Frame; 38-Workbench; 39-Working die; 40-Upper die; 41-Upper cylinder; 42-Turnover plate; 43-Placement hole; 44-Motor housing; 45-Clamping head; 46-Tool holder. Detailed Implementation

[0027] like Figures 1 to 8 As shown, this utility model provides a motor end cover for an air conditioner drain pump, comprising: end cover 1 and end cover 2 located at both ends of the motor housing 44; ball bearings 3 and bearing mounting parts 4 are provided inside end cover 1 and end cover 2, and the ball bearings 3 are fixed inside end cover 1 and end cover 2 by bearing mounting parts 4.

[0028] One end of end cap 1 has a protrusion 6, and the other end of end cap 1 has an open mounting cavity 7. The protrusion 6 passes through a shaft hole 8, which is connected to the mounting cavity 7. The shaft hole 8 is matched with a motor shaft 5, and a ball bearing 3 is fixedly connected to the mounting cavity 7 through a bearing mounting piece 4. The protrusion 6 of end cap 1 and the mounting cavity 7 form a stepped shaft hole structure, through which the motor shaft 5 passes to rotate. One end of end cap 2 has a protrusion 9, and the other end of end cap 2 has an open mounting cavity 10. The protrusion 9 has a shaft hole 11, which does not pass through the protrusion 9, but is connected to the mounting cavity 10. The shaft hole 11 is matched with a motor shaft 5, and a ball bearing 3 is fixedly connected to the mounting cavity 10 through a bearing mounting piece 4. The protrusion 29 of end cover 2 adopts a semi-closed shaft hole design, which, together with end cover 1, forms a stable support system for the motor shaft.

[0029] Both shaft hole 8 and shaft hole 11 have flared openings 12 at their ends near the corresponding mounting cavities 7 and 10. The end of the ball bearing 3 is held against the flared opening 12 by the bearing mounting component 4. The guide slope formed at the flared opening 12 facilitates the quick positioning of the ball bearing 3, while the opening design of the mounting cavity provides operating space for subsequent assembly.

[0030] An oil felt 13 is also fitted on the outside of the ball bearing 3. The bearing mounting part 4 rests against the side of the oil felt 13 away from the mounting cavity. The oil felt 13 absorbs lubricating oil and lubricates the ball bearing 3. The oil felt 13 fitted on the outside of the ball bearing 3 is made of annular sponge pad material, and continuous slow-release lubrication is achieved through an oil injection process. This solution breaks through the limitation of traditional grease lubrication which requires regular maintenance. The oil felt 13 can not only absorb lubricating oil to form an oil storage unit, but also penetrate evenly onto the bearing through capillary action. It can maintain a stable oil film thickness even under high-speed rotation conditions, significantly reducing the coefficient of friction and reducing metal fatigue damage.

[0031] The bearing mounting component 4 includes a compression spring 14 and an annular pressure plate 15. The compression spring 14 abuts against the other end of the ball bearing 3, allowing the ball bearing 3 to be movably connected within the corresponding mounting cavity 1 7 and mounting cavity 2 10. The annular pressure plate 15 is fixedly connected to the openings of the corresponding mounting cavity 1 7 and mounting cavity 2 10, and presses against the side of the compression spring 14 away from the ball bearing 3. The compression spring 14 includes an annular base plate 16 and claw portions 17. The claw portions 17 are distributed circumferentially along the inner edge of the annular base plate 16 and abut against the other end of the ball bearing 3. End cap 1 and end cap 2 abut against the corresponding annular base plate 16. The claw portions 17 include a transition connecting section 18 and an abutting deformation section 19. The transition connecting section 18 is bent at an angle along the inner edge of the annular base plate 16 away from the ball bearing 3, and the abutting deformation section 19 is bent along the transition connecting section 18 away from the annular base plate 16, and the abutting deformation section 19 presses against the ball bearing 3. The annular pressure plate 15 presses against the compression spring 14, exerting a certain pressure on the spring 14. The spring 14 enables the ball bearing 3 to self-align. The compression spring 14, composed of the annular base plate 16 and the claw portion 17, provides a stable axial preload and allows the ball bearing 3 to automatically rebound when there is a slight radial displacement. This effectively absorbs dimensional changes caused by temperature variations or load fluctuations, avoids stress concentration problems caused by rigid connections, and achieves the self-aligning effect of the ball bearing 3. The composite bending design of the transition connection section 18 and the abutment deformation section 19 forms a progressive elastic support for the ball bearing 3.

[0032] Both mounting cavity 7 and mounting cavity 10 have slots 20 at their openings, which are matched with annular pressure plates 15. A through hole 21 runs through the center of the annular pressure plate 15, matching the ball bearing 3 and the claw portion 17. The opening is riveted by a servo press 36 to form circumferentially distributed pressure grooves 22. A riveting block 23 extending towards the center of the opening is formed at the bottom of the pressure grooves 22, limiting the annular pressure plate 15 within the slots 20. The slots 20 at the mounting cavity openings and the annular pressure plate 15 form a precise fit structure. The circumferential pressure grooves 22 formed by the servo press 36 and the radially extending riveting block 23 achieve the limited installation of the ball bearing 3 and the compression spring 14. This design not only provides axial preload to eliminate bearing clearance but also forms a permanent mechanical limit through the plastic deformation of the riveting block 23, effectively preventing the annular pressure plate 15 from loosening under vibration. The matching design of the through hole 21 with the bearing and the claw 17 further optimizes the force transmission path, so that the elastic force of the compression spring 14 is evenly applied to the ball bearing 3, which significantly improves the dynamic stability and impact resistance of the motor when it is running at high speed.

[0033] like Figures 9 to 14 The diagram shows the processing technology of a motor end cover for an air conditioner drain pump according to this utility model, which includes the following steps: a. Raw material manufacturing First, blanks for end cap 1 and end cap 2 are obtained by die casting. End face 24, end face 25 and end face 26 are formed on the blanks.

[0034] b. Finishing by turning (1) The feeding vibratory plate 31 controls the blank to be fed into the clamping component 29 of the cutting tool 27 through the conveying channel 32. The positioning groove 34 is used to geometrically constrain the protrusion of the blank, so that the blank is automatically calibrated and oriented in the conveying channel 32, and fed into the clamping component 29 one by one.

[0035] (2) The turning clamping assembly adopts a robot arm to control the blank to be clamped and fixed at the corresponding protrusion 6 and protrusion 9 of the blank by the clamping head 45. The turning equipment 27 is equipped with a tool holder 46, which is equipped with three turning tools. By controlling the three corresponding turning tools to turn end face 24, end face 25 and end face 26 respectively, the turning process of one clamping is realized.

[0036] (3) After the blanking and turning are completed, the blank that has been turned on the clamping head 45 is removed by the robot arm of the blanking component 30 and sent out of the lathe.

[0037] c. Assembly (1) Placement of ball bearing 3 and oil felt 13: Place the openings of end cap 1 and end cap 2 facing upwards, and then place the ball bearing 3 into the flared openings 12 of the corresponding end cap 1 and end cap 2. Then place the annular sponge pad on the ball bearing 3, and place end cap 1 and end cap 2 into the corresponding turnover plate 42. The protrusions 6 and 9 are inserted into the placement holes 43 of the turnover plate 42 for positioning.

[0038] (2) The end cap 1 and end cap 2 from the above steps are transferred to the oiling machine 35 by the turnover plate 42, and the end cap 1 and end cap 2 are placed in the placement seat below the oiling port of the oiling machine 35. The oiling machine 35 injects lubricating oil into the annular sponge pad, so that the annular sponge pad forms an oil felt 13 to lubricate the ball bearing 3.

[0039] d. Press-fitting First, place the compression spring 14 on the ball bearing 3, then place the annular pressure plate 15 on the compression spring 14, place the assembled workpiece on the working mold 39, align it with the upper mold 40, control the upper cylinder 41 to drive the upper mold 40 to press down, and use the riveting equipment to rivet the openings of end cover 1 and end cover 2, forming a circumferentially distributed pressure groove 22 at the opening, and forming a riveting block 23 extending towards the center of the opening at the bottom of the pressure groove 22. The riveting block limits and fixes the annular pressure plate 15 in the groove 20, thus completing the manufacturing of the motor end cover.

[0040] By employing a single-clamping process on a CNC lathe or machining center, the turning of end face 1 24, end face 25, and end face 3 26 are completed simultaneously through a precision spindle system. This eliminates the cumulative datum error caused by multiple clamping operations, significantly improving the machining accuracy of the motor end cover concentricity. The setup of the loading assembly 28, clamping assembly 29, and unloading assembly 30 enables batch turning of end cover 1 and end cover 2, greatly improving machining efficiency. The vibratory feeder 31 of the loading assembly 28, in conjunction with the C-shaped conveyor channel 32, utilizes the positioning groove 34 to geometrically constrain the protrusions of the blank, achieving automatic orientation and posture calibration of the blank.

[0041] The design of the compression spring 14 pressing against the oil felt 13 creates a constant lubrication pressure field, allowing the grease to form a uniform oil film within the bearing raceway. The oil felt 13, formed by impregnating the annular sponge pad with the oiling machine 35, ensures both sustained release of lubricating oil and avoids increased bearing resistance caused by excessive grease.

[0042] The servo press 36, through the precise cooperation between the upper die 40 and the working die 39, and the precise downward pressing action of the upper cylinder 41, ensures that the annular pressure plate 15 and the end cap opening form uniform plastic deformation, avoiding the stress concentration problem that may occur in traditional stamping processes. The extension of the riveting block 23 formed by riveting improves the connection strength, ensuring that the bearing assembly maintains structural stability during high-speed operation.

[0043] The uniformly distributed layout of the plates enables parallel processing at multiple stations, which, combined with an automated conveyor system, significantly improves assembly efficiency. This design protects the precision-machined surfaces of the end caps from scratches and ensures consistent workpiece positioning during the riveting process.

[0044] This invention features ball bearings 3 installed within end cap 1 and end cap 2, respectively, via bearing mounting parts 4. The ball bearings 3 achieve automatic self-alignment, effectively compensating for axial misalignment caused by assembly errors or thermal deformation. This design avoids bearing jamming due to stress concentration in traditional end cap structures, significantly reducing vibration and noise during motor operation. Furthermore, the manufacturing process of this invention allows for precision machining of the three end faces in a single clamping operation, controlling concentricity within 0.02, greatly improving the machining accuracy of the motor end caps, further reducing vibration and noise during motor operation, and significantly enhancing user comfort.

[0045] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A motor end cover for an air conditioning drain pump, comprising: End cap 1 and end cap 2 are located at both ends of the motor housing; The feature is that: both the first end cover and the second end cover are provided with ball bearings and bearing mounting parts, and the ball bearings are fixed in the first end cover and the second end cover by the bearing mounting parts.

2. The motor end cover for an air conditioner drain pump according to claim 1, characterized in that: One end of the end cap has a protrusion forming a protrusion, and the other end of the end cap has an open mounting cavity. The protrusion has a through shaft hole, which is connected to the mounting cavity. The shaft hole matches the motor shaft, and the ball bearing is fixedly connected to the mounting cavity through the bearing mounting component.

3. The motor end cover for an air conditioner drain pump according to claim 2, characterized in that: One end of the end cap 2 has a protrusion forming a protrusion 2, and the other end of the end cap 2 has an open mounting cavity 2. The protrusion 2 has a shaft hole 2, which does not penetrate the protrusion 2. The shaft hole 2 is connected to the mounting cavity 2, and the shaft hole 2 matches the motor shaft. The ball bearing is fixedly connected to the mounting cavity 2 through the bearing mounting component.

4. The motor end cover for an air conditioner drain pump according to claim 3, characterized in that: Both the first shaft hole and the second shaft hole are provided with flared openings near the ends of the first mounting cavity and the second mounting cavity, respectively, and the end of the ball bearing is pressed against the flared openings by the bearing mounting component.

5. The motor end cover for an air conditioner drain pump according to claim 3, characterized in that: An oil felt is also fitted on the outside of the ball bearing. The bearing mounting component abuts against the oil felt on the side away from the mounting cavity one and the mounting cavity two. The oil felt absorbs lubricating oil and lubricates the ball bearing.

6. The motor end cover for an air conditioner drain pump according to claim 3, characterized in that: The bearing mounting component includes a compression spring and an annular pressure plate. The compression spring abuts against the other end of the ball bearing, so that the ball bearing is movably connected in the corresponding mounting cavity one and mounting cavity two. The annular pressure plate is fixedly connected to the opening of the corresponding mounting cavity one and mounting cavity two, and the annular pressure plate presses against the side of the compression spring away from the ball bearing.

7. The motor end cover for an air conditioner drain pump according to claim 6, characterized in that: The compression spring includes an annular base plate and claw portions. The claw portions are distributed circumferentially along the inner edge of the annular base plate. The claw portions abut against the other end of the ball bearing. End cap one and end cap two abut against the corresponding annular base plates.

8. The motor end cover for an air conditioner drain pump according to claim 7, characterized in that: The claw portion includes a transition connecting section and an abutting deformation section. The transition connecting section is bent at an angle along the inner edge of the annular substrate toward the end away from the ball bearing. The abutting deformation section is bent along the transition connecting section toward the end away from the annular substrate. The abutting deformation section abuts against the ball bearing.

9. The motor end cover for an air conditioner drain pump according to claim 7, characterized in that: Both the first mounting cavity and the second mounting cavity have slots at their openings. The slots are matched with the annular pressure plate. The annular pressure plate has a through hole in its center. The through hole is matched with the ball bearing and the claw. The opening is riveted by a servo press to form circumferentially distributed pressure grooves. The bottom of the pressure groove forms a riveting block extending toward the center of the opening. The riveting block limits the annular pressure plate in the slot.

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