Electronic water pump impeller press-fitting tool and press-fitting method

Abstract

The invention relates to the technical field of electronic water pump assembly, in particular to an electronic water pump impeller press-fitting tool and a press-fitting method.The press-fitting tool comprises a guide seat arranged on the upper end face of an electronic water pump shell, and the guide seat is sequentially provided with a guide hole and a containing cavity used for containing an impeller in the vertical direction; the upper side of the containing cavity communicates with the guide hole, and the lower side of the containing cavity communicates with an impeller mounting cavity in the shell. The pressing rod is arranged in the guide hole in a sliding mode, and the pressing rod exerts downward pressure on the impeller after abutting against the impeller so that the impeller can be pressed to the upper portion of the rotating shaft; the base is used for abutting against the lower end face of the shell and the lower end face of the rotating shaft. The tool has the advantages that the structure is simple, the impeller mounting requirement can be met without debugging equipment displacement parameters, operation is convenient, cost is low and the like, and the impeller press-fitting efficiency can be remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of electronic water pump assembly technology, specifically to an electronic water pump impeller press-fitting fixture and press-fitting method. Background Technology

[0002] To meet the stringent requirements of modern electric water pumps for high performance, high reliability, and long lifespan, the assembly of its core component, the impeller, has evolved from a simple press-fit operation into a cutting-edge manufacturing process requiring precision mechanical guidance, servo pressure control, real-time quality monitoring, and automated integration. This series of requirements complicates impeller assembly, demanding that specialized technicians invest significant time in meticulous debugging and parameter setting at each stage. This results in a substantial reduction in impeller assembly efficiency, hindering efforts to increase production capacity.

[0003] In summary, there is an urgent need for a press-fit tooling and press-fit method for electronic water pump impellers to solve the problems existing in the current technology. Summary of the Invention

[0004] The purpose of this invention is to provide a tooling for pressing and installing an electronic water pump impeller, aiming to solve the problem that the existing impeller pressing and installation process requires a lot of time for equipment debugging and parameter setting, which affects production efficiency. The specific technical solution is as follows: An electronic water pump impeller press-fitting fixture, comprising: A guide seat is provided on the upper end face of the electric water pump housing. The guide seat is provided with a guide hole and a receiving cavity for accommodating the impeller in sequence along the vertical direction. The upper side of the receiving cavity is connected to the guide hole, and the lower side is connected to the impeller mounting cavity on the housing. The pressure rod is slidably disposed in the guide hole. After the pressure rod presses against the impeller, it applies downward pressure to press the impeller onto the upper part of the rotating shaft. A base for abutting against the lower end face of the housing and the lower end face of the rotating shaft.

[0005] Preferably, the rotating shaft has a through hole that extends through itself along the axial direction, the pressure rod includes a guide rod and a positioning post one arranged in sequence, the guide rod is slidably disposed in the guide hole, the positioning post one is inserted into the upper part of the through hole, and the base is provided with a positioning post two and the positioning post two is inserted into the lower part of the through hole.

[0006] Preferably, the positioning post one and the through hole, as well as the positioning post two and the through hole, are clearance fits.

[0007] Preferably, the length of the positioning post is greater than the pressing depth of the impeller.

[0008] Preferably, the outer diameter of the guide rod is larger than the outer diameter of the rotating shaft.

[0009] Preferably, the pressure rod further includes a pressure plate, which is disposed at the end of the guide rod away from the positioning post.

[0010] Preferably, when the impeller is pre-installed, the vertical distance H between the pressure plate and the guide seat is greater than or equal to the pressing depth of the impeller, and the vertical distance from the lower end face of the guide rod to the upper end face of the rotating shaft is equal to the pressing depth of the impeller.

[0011] Preferably, the base includes a seat body and an upper boss disposed on the seat body, the second positioning post is disposed on the upper boss, and the height of the upper boss is equal to the design height difference between the lower end face of the housing and the lower end face of the rotating shaft.

[0012] Preferably, the base further includes a lower boss for positioning and docking the base.

[0013] The present invention also provides a method for press-fitting an electronic water pump impeller, wherein the press-fitting method using the aforementioned press-fitting fixture includes: The base is positioned directly below the press actuator. The semi-finished electronic water pump is placed on the base, with the lower end face of the housing resting on the base and the lower end face of the rotating shaft resting on the upper boss. The second positioning pin is inserted into the lower part of the through hole. Pre-installing the impeller involves: placing the guide seat on the upper end face of the housing, inserting the guide rod of the pressure rod into the guide hole, and simultaneously inserting the positioning pin through the assembly hole of the impeller to the upper part of the through hole; at this time, the vertical distance H between the pressure plate and the guide seat is greater than or equal to the pressing depth of the impeller, and the vertical distance from the lower end face of the guide rod to the upper end face of the rotating shaft is equal to the pressing depth of the impeller. The press actuator applies downward pressure to the pressure plate. When the lower end face of the guide rod contacts the upper end face of the rotating shaft, the impeller is press-fitted.

[0014] The application of the technical solution of the present invention has the following beneficial effects: The present invention can limit the two ends of the rotating shaft through the positioning post one and positioning post two, ensuring that the rotating shaft is always in a vertical state during the press-fitting process; at the same time, the cooperation between the guide hole and the guide rod can make the pressure rod apply pressure vertically downward, that is, the pressure is always along the axial direction of the rotating shaft, ensuring that the impeller is smoothly installed on the rotating shaft.

[0015] In this invention, when the impeller is pre-installed, the vertical distance H between the pressure plate and the guide seat is greater than or equal to the impeller's pressing depth. This ensures that the vertical stroke of the pressure plate downwards is greater than the impeller's pressing depth, meeting the impeller's pressing requirements. Simultaneously, the vertical distance from the lower end face of the guide rod to the upper end face of the rotating shaft is equal to the impeller's pressing depth. This ensures that during pre-installation, both the upper and lower ends of the impeller are held in place by the guide rod and the rotating shaft, preventing the impeller from moving between the guide rod and the rotating shaft and affecting the pressing process. Furthermore, the contact between the guide rod and the rotating shaft provides a hard limit, ensuring that the impeller is pressed into place precisely when the guide rod stops moving downwards. The tooling of this invention has advantages such as simple structure, no need to adjust equipment displacement parameters to meet impeller installation requirements, convenient operation, and low cost, significantly improving impeller pressing efficiency.

[0016] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the working state of the press-fitting fixture of the present invention; Figure 2 yes Figure 1 Schematic diagram of the intermediate compression bar; Figure 3 yes Figure 1 Schematic diagram of the middle base; Figure 4 yes Figure 1 Schematic diagram of the structure of the guide seat; Among them, 1. Pressure rod, 1.1 Pressure plate, 1.2 Guide rod, 1.3 Positioning post one, 2. Guide seat, 2.1 Guide hole, 2.2 Receiving cavity, 3. Impeller, 4. Housing, 4.1 Impeller mounting cavity, 5. Rotor assembly, 5.1 Rotating shaft, 5.2 Through hole, 6. Base, 6.1 Seat body, 6.2 Lower boss, 6.3 Positioning post two, 6.4 Upper boss, 7. Stator assembly. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more complete description is provided below, along with preferred embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0020] Example: An electronic water pump generally includes a stator assembly 7, a rotor assembly 5, a housing 4, and an impeller 3. The stator assembly 7 and the rotor assembly 5 work together to drive the impeller 3 to rotate. The rotor assembly 5 includes a shaft 5.1 and a rotor coil. To solve the problem of press-fitting the impeller 3, this embodiment provides an electronic water pump impeller press-fitting fixture, such as... Figures 1-4 As shown, it includes: The guide seat 2 is disposed on the upper end face of the electric water pump housing 4. The guide seat 2 is provided with a guide hole 2.1 and a receiving cavity 2.2 for accommodating the impeller 3 in sequence along the vertical direction. The upper side of the receiving cavity 2.2 is connected to the guide hole 2.1, and the lower side is connected to the impeller mounting cavity 4.1 on the housing 4. The pressure rod 1 is slidably disposed in the guide hole 2.1. After the pressure rod 1 presses against the impeller 3, it applies downward pressure to press the impeller 3 onto the upper part of the rotating shaft 5.1. The base 6 is used to abut against the lower end face of the housing 4 and the lower end face of the rotating shaft 5.1.

[0021] like Figures 1-4 As shown, in this embodiment, the rotating shaft 5.1 has a through hole 5.2 extending axially through itself. The through hole 5.2 is coaxial with the rotating shaft 5.1. The pressure rod 1 includes a guide rod 1.2 and a positioning post 1.3 arranged sequentially. The guide rod 1.2 is slidably disposed in the guide hole 2.1. The positioning post 1.3 is inserted into the upper part of the through hole 5.2. The base 6 has a positioning post 6.3, which is inserted into the lower part of the through hole 5.2. The positioning posts 1.3 and 6.3 can limit the two ends of the rotating shaft 5.1, ensuring that the rotating shaft 5.1 is always in a vertical state during the press-fitting process. In addition, the cooperation between the guide hole 2.1 and the guide rod 1.2 allows the pressure rod 1 to apply pressure vertically downwards, ensuring that the impeller is smoothly installed onto the rotating shaft 5.1.

[0022] Preferably, in order to ensure that the positioning post 1.3 and the positioning post 6.3 can achieve the limiting effect, the positioning post 1.3 and the through hole 5.2 and the positioning post 6.3 and the through hole 5.2 are all clearance fit.

[0023] See Figure 1The length of the positioning post 1.3 is greater than the pressing depth of the impeller 3, that is, to ensure that the positioning post 1.3 can penetrate the assembly hole of the impeller 3 and be inserted into the through hole 5.2.

[0024] Furthermore, since the rotating shaft 5.1 and the impeller 3 are generally interference fit, in this embodiment the outer diameter of the guide rod 1.2 is larger than the outer diameter of the rotating shaft 5.1, that is, the outer diameter of the guide rod 1.2 is larger than the inner diameter of the mounting hole of the impeller 3, and the lower end face of the guide rod 1.2 can press against the impeller 3 to achieve press fitting.

[0025] like Figure 1 and Figure 2 As shown, the pressure rod 1 also includes a pressure plate 1.1, which is located at the end of the guide rod 1.2 away from the positioning post 1.3. The pressure plate 1.1, the guide rod 1.2, and the positioning post 1.3 are arranged coaxially. The outer diameter of the pressure plate 1.1 is larger than the outer diameter of the guide rod 1.2. The pressure plate 1.1 can increase the contact area with the press actuator, ensuring a stable and uniform downward pressure is applied to the pressure rod 1.

[0026] like Figure 1 As shown, when the impeller 3 is pre-installed (i.e., ready for pressing but not yet pressure applied), the vertical distance H between the pressure plate 1.1 and the guide seat 2 is greater than or equal to the pressing depth of the impeller 3, ensuring that the vertical stroke of the pressure plate 1.1 moving downward is greater than the pressing depth of the impeller 3, thus meeting the pressing requirements of the impeller 3; the vertical distance from the lower end face of the guide rod 1.2 to the upper end face of the rotating shaft 5.1 is equal to the pressing depth of the impeller 3, ensuring that the upper and lower ends of the impeller 3 are held in place by the guide rod 1.2 and the rotating shaft 5.1 respectively during pre-installation, preventing the impeller 3 from moving between the guide rod 1.2 and the rotating shaft 5.1 during pre-installation and affecting the pressing. At the same time, the contact between the guide rod 1.2 and the rotating shaft 5.1 achieves hard limiting, ensuring that the impeller is pressed into place just as the guide rod 1.2 stops moving downward.

[0027] Furthermore, the upper end face of the rotating shaft 5.1 can be chamfered. The chamfer allows the assembly hole of the impeller 3 to be initially fitted onto the rotating shaft 5.1 during pre-installation. This can both constrain the movement of the impeller 3 between the guide rod and the rotating shaft 5.1 and provide guidance for the press-fit impeller 3.

[0028] See Figure 1 and Figure 3The base 6 includes a seat 6.1 and an upper boss 6.4 disposed on the seat 6.1. The positioning post 6.3 is disposed on the upper boss 6.4. The height of the upper boss 6.4 is equal to the design height difference between the lower end face of the housing 4 and the lower end face of the rotating shaft 5.1, ensuring that the lower end face of the housing can fall on the seat 6.1 and the lower end face of the rotating shaft 5.1 can fall on the upper boss 6.4 during press-fitting, ensuring that there is no relative movement between the housing and the rotor assembly 5 (i.e., the rotating shaft 5.1) during press-fitting, so that the height difference between the lower end face of the housing 4 and the lower end face of the rotating shaft 5.1 meets the design requirements.

[0029] Preferably, the base 6 further includes a lower boss 6.2 for positioning and docking the base 6. The lower boss 6.2 is mainly used to dock and limit the base 6 with the press or tooling, ensuring that the base 6 is installed directly below the press actuator.

[0030] This embodiment also provides a pressing method for pressing the impeller using the aforementioned pressing fixture, specifically including: The base 6 is positioned directly below the press actuator. The base 6 is limited by the lower boss 6.2. The semi-finished electronic water pump is placed on the base 6, with the lower end face of the housing 4 resting on the base 6.1 and the lower end face of the rotating shaft 5.1 resting on the upper boss 6.4. The positioning pin 2 6.3 is inserted into the lower part of the through hole 5.2. Pre-installing the impeller 3 involves: placing the guide seat 2 on the upper end face of the housing 4, inserting the guide rod 1.2 of the pressure rod 1 into the guide hole 2.1, and simultaneously inserting the positioning pin 1.3 through the assembly hole of the impeller 3 into the upper part of the through hole 5.2; at this time, the vertical distance H between the pressure plate 1.1 and the guide seat 2 is greater than or equal to the pressing depth of the impeller 3, and the vertical distance from the lower end face of the guide rod 1.2 to the upper end face of the rotating shaft 5.1 is equal to the pressing depth of the impeller 3; The press actuator applies downward pressure to the pressure plate 1.1. When the lower end face of the guide rod 1.2 contacts the upper end face of the rotating shaft 5.1, the impeller 3 is press-fitted.

[0031] Among them, semi-finished electronic water pumps such as Figure 1 The image shows an electric water pump that has completed the assembly of stator assembly 7 and rotor assembly 5, but has not yet completed the assembly of impeller 3.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An electronic water pump impeller press fitting tool, characterized by, The utility model relates to a kind of press-fitting tool and press-fitting method for electronic water pump impeller, including: Guide seat (2) is arranged on the upper end surface of electronic water pump shell (4), the guide seat (2) is sequentially provided with guide hole (2.1) and accommodating cavity (2.2) for accommodating impeller (3) along vertical direction, the upper side of the accommodating cavity (2.2) is communicated with the guide hole (2.1), and the lower side is communicated with the impeller mounting cavity (4.1) on the shell (4); Pressing rod (1) is slidably arranged in the guide hole (2.1), and the pressing rod (1) presses the impeller (3) to apply downward pressure to the impeller (3) to press-fit the impeller (3) to the upper part of the rotating shaft (5.1); Base (6) is used to abut against the lower end surface of the shell (4) and the lower end surface of the rotating shaft (5.1).

2. The electronic water pump impeller press-on tooling of claim 1, wherein, The rotating shaft (5.1) is provided with a through hole (5.2) penetrating through itself in the axial direction, the pressing rod (1) includes a guide rod (1.2) and a positioning column (1.3) arranged in sequence, the guide rod (1.2) is slidably arranged in the guide hole (2.1), the positioning column (1.3) is inserted into the upper part of the through hole (5.2), and the base (6) is provided with a positioning column (6.3) and the positioning column (6.3) is inserted into the lower part of the through hole (5.2).

3. The electronic water pump impeller press-on tooling of claim 2, wherein, The positioning column (1.3) and the through hole (5.2) are gap-fitted, and the positioning column (6.3) and the through hole (5.2) are also gap-fitted.

4. The electronic water pump impeller press-on tooling of claim 2, wherein, The length of the positioning column (1.3) is greater than the press-fitting depth of the impeller (3).

5. The electronic water pump impeller press-on tooling of claim 4, wherein, The outer diameter of the guide rod (1.2) is greater than the outer diameter of the rotating shaft (5.1).

6. The electronic water pump impeller press-on tooling of claim 5, wherein, The pressing rod (1) further includes a pressing disc (1.1), and the pressing disc (1.1) is arranged at the end of the guide rod (1.2) away from the positioning column (1.3).

7. The electronic water pump impeller press-on tooling of claim 6, wherein, When the impeller (3) is pre-installed, the vertical distance H between the pressing disc (1.1) and the guide seat (2) is greater than or equal to the press-fitting depth of the impeller (3), and the vertical distance between the lower end surface of the guide rod (1.2) and the upper end surface of the rotating shaft (5.1) is equal to the press-fitting depth of the impeller (3).

8. The electronic water pump impeller press-on tooling of any one of claims 2-7, wherein, The base (6) includes a seat body (6.1) and an upper boss (6.4) arranged on the seat body (6.1), the positioning column (6.3) is arranged on the upper boss (6.4), and the height of the upper boss (6.4) is equal to the designed height difference between the lower end surface of the shell (4) and the lower end surface of the rotating shaft (5.1).

9. The electronic water pump impeller press-on tooling of claim 8, wherein, The base (6) further includes a lower boss (6.2) for realizing positioning butt joint of the base (6).

10. An electronic water pump impeller press fitting method characterized by, The press-fitting method using the press-fitting tool according to any one of claims 1-9 includes: The base (6) is arranged directly below the press machine actuator, and the semi-finished electronic water pump is placed on the base (6), wherein the lower end surface of the shell (4) falls on the seat body (6.1), the lower end surface of the rotating shaft (5.1) falls on the upper boss (6.4), and the positioning column (6.3) is inserted into the lower part of the through hole (5.2). The pre-installed impeller (3) is specifically: the guide seat (2) is arranged on the upper end surface of the shell (4), the guide rod (1.2) of the pressing rod (1) is inserted into the guide hole (2.1), and the positioning column one (1.3) is inserted into the upper part of the through hole (5.2) after passing through the assembly hole of the impeller (3); at this time, the vertical distance H between the pressing plate (1.1) and the guide seat (2) is greater than or equal to the pressing depth of the impeller (3), and the vertical distance between the lower end surface of the guide rod (1.2) and the upper end surface of the rotating shaft (5.1) is equal to the pressing depth of the impeller (3); The pressing machine execution mechanism applies downward pressure to the pressing plate (1.1), and when the lower end surface of the guide rod (1.2) is in contact with the upper end surface of the rotating shaft (5.1), the impeller (3) is pressed and assembled.

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