A drone water pump motor

Abstract

A kind of unmanned aerial vehicle water pump motor, the circumferential outer wall of shell, front cover and rear cover is equipped with several shell connecting part, front cover connecting part and rear cover connecting part respectively;It is also equipped with connecting long shaft, connecting long shaft includes stem, the top of stem is equipped with rod end thread, the bottom of stem is equipped with head portion with greater diameter than stem;Stem is arranged in rear cover connecting hole and shell connecting hole, rod end thread is connected with front cover connecting thread hole by thread, head portion is arranged in blocking setback hole;Front cover connecting thread hole includes upper thread area and lower thread area, upper thread area is connected with the water pump body assembly of external connection, lower thread area is connected with connecting long shaft.By the improvement of the assembly connection structure of motor and water pump and the related structure for facilitating assembly cam to prevent axial displacement when assembling, the product structure and manufacturing process are simplified, the assembly efficiency is improved, and while simplifying the assembly work, the product quality is fully guaranteed, and the axial displacement of the shaft during the assembly of the water pump is avoided to affect the service life of the product.

Description

Technical Field

[0001] This utility model relates to the field of motors, specifically to a motor used in agricultural drones / unmanned aerial vehicles (UAVs) to connect to and drive a water pump. Background Technology

[0002] On agricultural drones or similar drones, a motor-driven water pump is required for spraying pesticides, water, or other liquids. This typically involves assembling the separately manufactured motor and pump body components, with the pump's cam mounted on the motor's central shaft output end, and the pump body fixedly connected to the motor.

[0003] In existing technologies, the motor and the water pump body are treated as two relatively independent components. The motor's protection involves connecting the front and rear covers to the main housing with two screws each, forming a relatively enclosed space to protect the rotor, stator, and other components inside the main housing. To connect to the water pump, holes are typically drilled in the front cover, or two additional bosses are provided for pump connection. However, drilling holes compromises the original strength of the front cover, requiring a redesign and thickening, which increases its weight. Adding bosses increases structural complexity, leading to complicated manufacturing processes and inconvenient assembly.

[0004] Furthermore, when assembling the motor with the water pump, an eccentric cam needs to be installed at the front end of the motor's central shaft to drive the diaphragm pump. Due to the working characteristics and design requirements of the water pump, the cam and the central shaft need to be tightly fitted with an interference fit. When installing the eccentric cam and the diaphragm pump onto the central shaft, an axial thrust is generated, which can easily cause the central shaft to shift axially. Since the rotor assembly is integrated with the central shaft, this will cause changes in the position of the stator and rotor magnetic fields, thereby affecting the motor's performance and energy efficiency. The existing solution is to advance the cam pressing process, that is: press the front bearing and the front cover together to form an assembly, and then use the end face of the central shaft of the rotor assembly as a support point to sequentially press the inner ring of the bearing and the cam of the front cover assembly into the position determined by the central shaft of the rotor assembly with an interference fit, and then assemble it with the stator assembly, housing, rear cover, and other components. To prevent axial movement of the central shaft during motor operation or displacement of the central shaft due to cam removal, a screw and washer connection is used between the lower bearing and the tail end of the central shaft to axially limit and suppress axial movement. This solution involves complex production processes and is more suitable for motor manufacturers that sell motors with cams, but not for manufacturers that only produce single motors. Furthermore, the existing technical solution has some drawbacks and potential risks: 1. External front bearing – The external placement of the front bearing on the outside of the front cover creates a risk of loosening and detachment. Additionally, due to issues with component materials, machining accuracy, and quality, or fatigue and aging of the diaphragm after long-term operation, liquid can seep into the motor through the gaps between the front bearing and the central shaft, and between the front bearing and the bearing housing, leading to rust and corrosion, potentially causing motor open circuits, short circuits, and other failures, as well as personal and property safety risks. 2. Inconvenience and quality risks of repairing or replacing the cam: Completely disassembling the motor, pressing the cam in place, and then reassembling other components is extremely cumbersome and requires a high level of expertise. If the cam is pressed in directly from the outside of the motor, the force on the central shaft will shift axially, affecting and reducing the quality and performance of the motor. Utility Model Content

[0005] In view of the above, this utility model proposes a drone water pump motor. Through improvements in the assembly and connection structure between the motor and the water pump, as well as related structures that facilitate the assembly of the cam and prevent axial displacement during assembly, the product structure and manufacturing process are simplified, the assembly efficiency is improved, and the product quality is fully guaranteed while simplifying the assembly work, avoiding the impact on the product's service life caused by the central shaft displacement that may occur during the assembly of the water pump.

[0006] According to this utility model, a drone water pump motor is provided with a housing, inside which a stator assembly and a rotor assembly are provided. A front cover is connected to the top of the housing, and a rear cover is connected to the bottom of the housing. The outer circumferential walls of the housing, the front cover, and the rear cover are respectively provided with a plurality of housing connecting parts, a front cover connecting part, and a rear cover connecting part. Each housing connecting part has an axially penetrating housing connecting hole, each front cover connecting part has an axially penetrating front cover connecting threaded hole, and each rear cover connecting part has an axially penetrating rear cover connecting hole. A countersunk hole is provided below the rear cover connecting hole. A connecting long shaft is also provided, comprising a rod body with a rod end thread at the top and a head with a diameter larger than the rod body at the bottom. The rod body is disposed within the rear cover connecting hole and the housing connecting hole, with the rod end thread threadedly connected to the front cover connecting threaded hole, and the head disposed within the countersunk hole. The front cover connecting threaded hole includes an upper threaded area and a lower threaded area; the upper threaded area is connected to an external water pump body assembly, and the lower threaded area is connected to the connecting long shaft.

[0007] Preferably, a stator mounting base is provided at the lower part of the housing, and a stator shaft for mounting the stator assembly is provided on the stator mounting base. The stator shaft has a stator shaft hole that runs vertically through the housing. A central shaft is provided in the stator shaft hole, and the rotor assembly is fixedly mounted on the central shaft. The top end of the central shaft extends out of the front cover and connects to the water pump assembly to be assembled.

[0008] Furthermore, the stator fixing seat has a lower bearing seat at its bottom, and a lower bearing is provided in the lower bearing seat. The tail end of the central shaft is fixedly installed in the inner ring of the lower bearing, and the outer ring of the lower bearing is fixedly installed in the lower bearing seat.

[0009] Furthermore, an adhesive layer is provided between the outer ring of the lower bearing and the inner wall of the lower bearing housing.

[0010] Furthermore, the outer wall of the central shaft is provided with a shaft groove, the inner wall of the lower bearing seat is provided with a seat groove, a retaining ring is provided in the shaft groove, and a retaining ring is provided in the seat groove; the retaining ring is located above the inner ring of the lower bearing, the retaining ring is located below the outer ring of the lower bearing, and the lower bearing is clamped and fixed between the retaining ring and the retaining ring.

[0011] Furthermore, the diameter of the central shaft is smaller than the diameter of the stator shaft hole.

[0012] Preferably, the stator mounting base and the housing are an integral structure.

[0013] Preferably, the outer peripheral wall of the stator shaft is provided with a plurality of adhesive grooves, and when the stator assembly is installed on the stator shaft, an adhesive layer is filled in the adhesive grooves between the stator shaft and the stator assembly.

[0014] After adopting the technology proposed in this utility model, the technical solution of this utility model has the following beneficial effects:

[0015] 1) Improvements to the assembly and connection structure of the motor and water pump, as well as related structures that facilitate the assembly of the cam to prevent axial displacement during assembly, have simplified the product structure and manufacturing process, improved assembly efficiency, and eliminated the need for additional tooling to assemble the motor and water pump.

[0016] 2) While simplifying the assembly process, it fully ensures product quality and avoids the possibility of shaft displacement during water pump assembly, which could affect the product's service life. Attached Figure Description

[0017] Figure 1 A structural diagram of a drone water pump motor according to an embodiment of this application is shown;

[0018] Figure 2 A cross-sectional view of the structure of a drone water pump motor according to an embodiment of this application is shown.

[0019] Explanation of icon numbers:

[0020] Housing 11 Countersunk Hole 1301

[0021] Housing connection hole 110 Rear cover connection part 131

[0022] Housing connection part 111 connects to long shaft 14

[0023] Front cover 12, rod end thread 140

[0024] Front cover connection threaded hole 120, rod body 141

[0025] Upper threaded area 1201 Head 142

[0026] Lower threaded area 1202 Stator assembly 2

[0027] Front cover connection 121 Rotor assembly 3

[0028] 13 Rear cover, 4 Stator mounting brackets

[0029] Rear cover connection hole 130, lower bearing seat 40

[0030] Seat groove 405, central shaft 5

[0031] Stator shaft 41, shaft groove 504

[0032] Stator shaft hole 410, retaining ring 51

[0033] Glue groove 411, retaining ring 52

[0034] Lower bearing 42 Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the embodiments given in the accompanying drawings. The described embodiments include various specific details to aid understanding, but they are only to be considered exemplary and represent a portion, not all, of the embodiments of the present invention. Furthermore, to make the specification clearer and more concise, detailed descriptions of functions and structures well-known in the art will be omitted.

[0036] Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "upper," "lower," "above," and "below" used in this application refer to the general vertical relationship shown in the accompanying drawings. When the placement changes, such as during a flip, the corresponding positional relationships should also be adjusted to understand or implement the technical solution of this application.

[0037] like Figure 1 and Figure 2 As shown, a drone water pump motor includes a housing 11, within which a stator assembly 2 and a rotor assembly 3 are housed. A front cover 12 is connected to the top of the housing 11, and a rear cover 13 is connected to the bottom of the housing 11. The outer circumferential walls of the housing 11, front cover 12, and rear cover 13 are respectively provided with a plurality of housing connection portions 111, front cover connection portions 121, and rear cover connection portions 131. Each housing connection portion 111 has an axially penetrating housing connection hole 110, each front cover connection portion 121 has an axially penetrating front cover connection threaded hole 120, and each rear cover connection portion 131 has an axially penetrating rear cover connection hole 130. A countersunk hole 1 is located below the rear cover connection hole 130. 301; It also includes a connecting long shaft 14, which includes a rod body 141. The top of the rod body 141 is provided with a rod end thread 140, and the bottom of the rod body 141 is provided with a head 142 with a diameter larger than that of the rod body 141. The rod body 141 is disposed in the rear cover connecting hole 130 and the housing connecting hole 110. The rod end thread 140 is threadedly connected to the front cover connecting threaded hole 120, and the head 142 is disposed in the anti-reverse countersunk hole 1301. The front cover connecting threaded hole 120 includes an upper threaded area 1201 and a lower threaded area 1202. The upper threaded area 1201 is connected to an external water pump body assembly, and the lower threaded area 1202 is connected to the connecting long shaft 14.

[0038] The lower part of the housing 11 is provided with a stator fixing seat 4, and the stator fixing seat 4 is provided with a stator shaft 41 for installing the stator assembly 2. The stator shaft 41 is provided with a stator shaft hole 410 that runs vertically through the shaft. A central shaft 5 is provided in the stator shaft hole 410. The rotor assembly 3 is fixedly installed on the central shaft 5. The top end of the central shaft 5 extends out of the front cover 12 and is connected to the water pump assembly to be assembled.

[0039] The stator fixing seat 4 has a lower bearing seat 40 at its bottom, and a lower bearing 42 is provided in the lower bearing seat 40. The tail end of the central shaft 5 is fixedly installed in the inner ring of the lower bearing 42, and the outer ring of the lower bearing 42 is fixedly installed in the lower bearing seat 40.

[0040] The outer ring of the lower bearing 42 and the inner wall of the lower bearing housing 40 are fitted with an interference fit or a clearance fit and are provided with an adhesive layer. This is mainly to improve the connection strength and the reliability of preventing loosening and detachment, and to prevent the bearing 42 from loosening and falling out of the bearing housing 40.

[0041] The outer wall of the central shaft 5 is provided with a shaft groove 504, and the inner wall of the lower bearing seat 40 is provided with a seat groove 405. A retaining ring 51 is provided in the shaft groove 504, and a retaining ring 52 is provided in the seat groove 405. The retaining ring 51 is located above the inner ring of the lower bearing 42, and the retaining ring 52 is located below the outer ring of the lower bearing 42. The lower bearing 42 is clamped and fixed between the retaining ring 51 and the retaining ring 52. Its main function is to provide a support point for the central shaft when external connecting parts such as cams are pressed onto it, preventing axial displacement. Alternatively, the shaft groove 504 and retaining ring 51 can be machined into a step at this location, with the outer diameter of the step slightly larger than the inner ring of the bearing, achieving the same support function.

[0042] When the cam on the water pump assembly is pressed against the central shaft, the central shaft must have a support point to prevent axial displacement of the central shaft during the pressing of the cam.

[0043] According to the embodiment of the UAV water pump motor of this application, the retaining ring groove (shaft insertion groove 504) and retaining ring (retaining ring 51) at the tail of the central shaft 5 support each other on the inner ring of the lower bearing 42; the outer ring of the lower bearing 42 and the inner ring of the lower bearing seat 40 of the outer shell are interference-fitted, or the two can be further fixed by adhesive bonding; and a retaining ring groove (seat insertion groove 405) and retaining ring (retaining ring 52) are added to the inner ring of the lower bearing seat 40; through the above solutions and their combination, a more robust and reliable force support point can be provided for the central shaft. The structure of the retaining ring groove at the tail of the central shaft, the retaining ring, the retaining ring groove in the lower bearing seat, and the retaining ring ensures that the central shaft has a force point when pressing the cam, and will not produce axial displacement, while also further preventing the lower bearing 42 from loosening and falling off.

[0044] The diameter of the central shaft 5 is smaller than the diameter of the stator shaft hole 410.

[0045] The stator fixing base 4 and the housing 11 are an integral structure.

[0046] The stator shaft 41 has several adhesive grooves 411 on its outer peripheral wall. When the stator assembly 2 is installed on the stator shaft 41, an adhesive layer is filled in the adhesive grooves 411 between the stator shaft 41 and the stator assembly 2. With the stator adhesive groove installation structure, adhesive grooves are provided on the inner periphery of the stator. During stator installation, an interference fit is no longer required; instead, a clearance fit is used for assembly. The adhesive layer, after curing, provides connection and fixation, facilitating component assembly.

[0047] The terms circumferential, axial, or similar used in this application refer to the central shaft of the motor, i.e., the axial direction is the axial direction of the central shaft, and so on.

[0048] The connecting long shaft 14 is a long screw structure in general. Its head 142 can adopt common screw head types such as round head, countersunk head, semi-round head, cylindrical head, hex head, internal hex, cross slot, etc. to facilitate fastening operations. The countersunk hole 1301 is designed adaptively according to different head types.

[0049] According to the embodiments of this application, the drone water pump motor, through improvements to the front cover connection part and mating structure, uses a long shaft to connect and fix the entire motor housing. Half of the threaded length of the front cover is used for connecting and fixing the motor itself, while the other half of the threaded length is used for connecting the water pump. This avoids the drawbacks of drilling holes or adding additional bosses to the front cover. While ensuring reliable protection for both the motor and water pump components, it also facilitates their connection and assembly without compromising the original structural performance. This reduces weight, simplifies the structure, streamlines the manufacturing process, and improves assembly convenience.

[0050] According to the embodiments of the UAV water pump motor of this application, compared with the previous structure in which the tail bearing of the central shaft is limited by screws and washers, this application combines the conventional requirement of axial limiting during motor operation with the requirement to prevent the central shaft from shifting due to strong impact / pressing during water pump assembly. First, the installation position of the tail end of the central shaft is set on the stator fixing seat 4 fixedly connected to the housing 11, so that the impact / pressing force borne by the central shaft can be transmitted to the housing 11, obtaining a more solid support foundation. Second, the central shaft 5 and the inner ring of the lower bearing 42 are fixed by interference fit or clearance fit and glue, avoiding the relative movement that may occur when they are subjected to impact / pressing. In addition, the axial limiting of the lower bearing 42 by the retaining ring 51 and the retaining ring 52 not only limits the axial position of the central shaft 5, but also further prevents mutual sliding displacement. When subjected to axial thrust, the retaining ring on the central shaft pushes, while the retaining ring (spring) in the hole below the tail bearing prevents the bearing from loosening and falling off. Depending on the specific needs, the lower bearing 42 can be a thrust bearing or a combination of bearings.

[0051] The drone water pump motor according to the embodiments of this application simplifies the product structure and manufacturing process by improving the assembly connection structure between the motor and the water pump, as well as the related structure that facilitates the assembly of the cam and prevents axial displacement during assembly. This improves assembly efficiency and eliminates the need for additional tooling for assembling the motor and water pump. Furthermore, while simplifying the assembly process, it fully ensures product quality and avoids potential central shaft displacement during water pump assembly that could affect the product's lifespan.

Claims

1. A drone water pump motor, comprising a housing, a stator assembly and a rotor assembly housed within the housing, a front cover connected to the top of the housing, and a rear cover connected to the bottom of the housing; characterized in that, The outer circumferential walls of the housing, front cover, and rear cover are respectively provided with a plurality of housing connecting parts, front cover connecting parts, and rear cover connecting parts. The housing connecting parts are provided with axially penetrating housing connecting holes, the front cover connecting parts are provided with axially penetrating front cover connecting threaded holes, and the rear cover connecting parts are provided with axially penetrating rear cover connecting holes. A countersunk hole is provided below the rear cover connecting holes. A connecting long shaft is also provided. The connecting long shaft includes a rod body. The top of the rod body is provided with a rod end thread, and the bottom of the rod body is provided with a head with a diameter larger than the rod body. The rod body is disposed in the rear cover connecting holes and the housing connecting holes. The rod end thread is threadedly connected to the front cover connecting threaded hole, and the head is disposed in the countersunk hole. The front cover connecting threaded hole includes an upper threaded area and a lower threaded area. The upper threaded area is connected to an external water pump body assembly, and the lower threaded area is connected to the connecting long shaft.

2. The UAV water pump motor according to claim 1, characterized in that, The lower part of the housing is provided with a stator fixing seat, and the stator fixing seat is provided with a stator shaft for installing the stator assembly. The stator shaft is provided with a stator shaft hole that runs vertically through the shaft. A central shaft is provided in the stator shaft hole. The rotor assembly is fixedly installed on the central shaft. The top end of the central shaft extends out of the front cover and connects to the water pump assembly to be assembled.

3. A UAV water pump motor according to claim 2, characterized in that, The stator mounting base is provided with a lower bearing seat at its bottom, and a lower bearing is provided in the lower bearing seat. The tail end of the central shaft is fixedly installed in the inner ring of the lower bearing, and the outer ring of the lower bearing is fixedly installed in the lower bearing seat.

4. A UAV water pump motor according to claim 3, characterized in that, An adhesive layer is also provided between the outer ring of the lower bearing and the inner wall of the lower bearing housing.

5. A UAV water pump motor according to claim 3, characterized in that, The outer wall of the central shaft is provided with a shaft groove, and the inner wall of the lower bearing seat is provided with a seat groove. A retaining ring is provided in the shaft groove, and a retaining ring is provided in the seat groove. The retaining ring is located above the inner ring of the lower bearing, and the retaining ring is located below the outer ring of the lower bearing. The lower bearing is clamped and fixed between the retaining ring and the retaining ring.

6. A UAV water pump motor according to claim 2, characterized in that, The diameter of the central shaft is smaller than the diameter of the stator shaft hole.

7. A UAV water pump motor according to claim 2, characterized in that, The stator mounting base and the housing are an integral structure.

8. A UAV water pump motor according to claim 2, characterized in that, The outer peripheral wall of the stator shaft is provided with several glue grooves. When the stator assembly is installed on the stator shaft, the glue grooves are filled with an adhesive layer between the stator shaft and the stator assembly.

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