An electronic oil pump with improved pump body structure

Abstract

An improved electronic oil pump includes a pump body and a pump cover fixed to one axial side of the pump body. The pump body features a shoulder in its middle section, with an annular retaining ring fitted between the shoulder and the pump cover. The retaining ring and shoulder clamp together to form a mounting groove, within which a sealing ring is installed. The pump cover is fixed to the pump body and restricts the axial movement of the retaining ring. This improved design allows for parting lines at any point axially avoiding the mounting groove during mold manufacturing, preventing weld lines within the mounting groove, reducing the radial clearance between the sealing ring and the pump body after installation, and improving the reliability of the electronic oil pump's connection to external equipment.

Description

Technical Field

[0001] This utility model relates to an electronic oil pump with an improved pump body structure, and its IPC classification number is F04C15 / 00. Background Technology

[0002] Current electronic oil pumps, as shown in prior patent publication CN110541818B entitled "Electronic Oil Pump," include a first housing (i.e., pump body), a rotor assembly mounted on the first housing, and a third housing (i.e., pump cover) located at one axial end of the first housing. To facilitate connection between the pump body and external equipment and prevent leakage after connection, the radial surface of the first housing needs a sealing groove for assembling a sealing ring. Since the first housing is often made of plastic through injection molding, a parting surface is required during manufacturing, inevitably resulting in at least two weld lines within the sealing groove after injection molding. When a sealing ring is installed within the sealing groove, these weld lines radially push up the sealing ring, creating a gap between the sealing groove and the sealing ring. When the electronic oil pump is connected to an external device, liquid leaks through this gap. Therefore, improvements are needed. Utility Model Content

[0003] To address the problems described in the background section, this utility model provides the following technical solution:

[0004] An improved pump body structure electronic oil pump includes a pump body and a pump cover fixed to one side of the pump body's axial direction. The pump body has a shoulder in the middle section, and an annular retaining ring is fitted between the shoulder and the pump cover. The retaining ring and the shoulder clamp together to form a mounting groove. A sealing ring is provided in the mounting groove. The pump cover is fixed to the pump body and restricts the axial movement of the retaining ring.

[0005] This invention relates to an improved pump body structure for an electronic oil pump. The pump body has a first annular surface and a second annular surface, which are combined and connected with a retaining ring and a limiting member to form an installation groove for installing a sealing ring. With this design, the pump body mold can be manufactured by axially avoiding any position of the installation groove as the parting surface, thus avoiding protruding weld lines in the installation groove, reducing the radial clearance between the sealing ring and the pump body after installation in the installation groove, and improving the reliability of the electronic oil pump connection with external equipment.

[0006] Furthermore, the middle section of the pump body protrudes sequentially towards the pump cover to form a first annular surface and a second annular surface. The outer diameter of the second annular surface is smaller than the outer diameter of the first annular surface, and the second annular surface is adjacent to the first annular surface to form a shoulder.

[0007] Furthermore, the pump cover is fixed to the pump body and restricts the axial movement of the retaining ring. Specifically, the radial surface of the pump body axially close to the pump cover has a recessed slot extending axially from the top. A columnar limiting member is inserted into the slot. One axial end of the limiting member abuts against the retaining ring, and the other side abuts against the pump cover.

[0008] Furthermore, the radial cross-sections of both the slot and the limiting member are dovetail-shaped.

[0009] Furthermore, the retaining ring has a mounting boss protruding from the axial end face on the side facing the pump cover. The radial inner wall surface of the mounting boss protrudes inward to form a protrusion, and the radial outer wall surface of the pump body is concave to form a recess for the protrusion to be inserted.

[0010] Furthermore, the limiting member includes a columnar main body and an outer protrusion protruding from the radial surface of the main body, the outer protrusion axially abutting against the axial surface of the mounting boss.

[0011] Furthermore, the electronic oil pump with the improved pump body structure also includes a bottom cover located on one side of the pump body along the axial direction. The pump cover has an annular first boss protruding axially toward the end face of the pump body, and the pump body is recessed axially toward the end face of the pump cover to form an annular groove opposite the first boss. The bottom cover is welded and fixed to the pump body.

[0012] Furthermore, the bottom cover has a second annular protrusion on the end face facing the pump body, and the radial outer wall of the second protrusion is welded to the inner wall of the pump body on the side away from the pump cover.

[0013] The more specific design and technical effects of this utility model are further explained in conjunction with the accompanying drawings in the specific embodiments. Attached Figure Description

[0014] Figure 1 This is an axial sectional view of the electronic oil pump of this utility model;

[0015] Figure 2 yes Figure 1 A magnified schematic diagram of the structure of part A in the diagram;

[0016] Figure 3 yes Figure 1 A magnified schematic diagram of the partial structure of B in the diagram;

[0017] Figure 4 This is a three-dimensional structural diagram of the pump body of this utility model;

[0018] Figure 5 This is a three-dimensional structural diagram of the retaining ring of this utility model;

[0019] Figure 6 This is a three-dimensional structural diagram of the limiting component of this utility model;

[0020] in:

[0021] 10-Mounting groove, 100-Pump body, 110-First annular surface, 120-Second annular surface, 130-Slot, 140-Inner recess, 150-Counter groove, 160-Shoulder, 200-Retaining ring, 210-Retaining ring body, 211-Mounting boss, 212-Protrusion, 300-Pump cover, 400-Sealing ring, 500-Limiting element, 510-Body body, 520-Outer protrusion, 600-Bottom cover, 610-Bottom cover body, 611-First boss, 612-Second boss, 700-Stator assembly, 800-Rotor assembly Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] See Figure 1 , Figure 2 and Figure 4 This utility model discloses an electronic oil pump with an improved pump body structure, including a pump body 100, a stator assembly 700 fixedly mounted on the pump body 100, a rotor assembly 800 rotatably mounted on the pump body 100, a pump cover 300 covering one axial side of the pump body 100, a bottom cover 600 covering the other axial side of the pump body 100, an annular retaining ring 200, a sealing ring 400, a limiting member 500, and an inner rotor 910 and an outer rotor 920 rotatably mounted within the working cavity enclosed by the pump body 100 and the pump cover 300. Except for the structure of the pump body, the structure and working principle of other parts of this electronic oil pump are the same as those of existing pumps (such as the background patent), and will not be repeated here. The pump body 100 of this electronic oil pump is an annular body with a hollow cavity, and a shoulder 160 is provided in the middle section of its outer contour. When assembling the electronic oil pump in this scheme, the retaining ring 200 is sleeved on one axial side of the pump body 100 and clamped with the shaft shoulder 160 to form an installation groove 10. The sealing ring 400 is installed on the installation groove 10. After the pump cover 300 is placed on the pump body 100, it restricts the axial movement of the retaining ring 200 and prevents the retaining ring from falling off.

[0024] This invention relates to an improved pump body structure for an electronic oil pump. The pump body has a first annular surface and a second annular surface, which are combined and connected with a retaining ring and a limiting member to form an installation groove for installing a sealing ring. With this design, the pump body mold can be manufactured by axially avoiding any position of the installation groove as the parting surface, thus avoiding protruding weld lines in the installation groove, reducing the radial clearance between the sealing ring and the pump body after installation in the installation groove, and improving the reliability of the electronic oil pump connection with external equipment.

[0025] See example 2. Figure 4 and Figure 6 In a preferred embodiment, the middle section of the pump body 100 protrudes sequentially towards the pump cover 300 to form a first annular surface 110 and a second annular surface 120. The outer diameter of the second annular surface 120 is smaller than the outer diameter of the first annular surface 110, and the second annular surface 120 and the first annular surface 110 are adjacent to each other to form a shoulder 160. This design facilitates the manufacturing of the pump body 100. Further, the pump body 100 has a recessed radial surface on the axial side near the pump cover 300, forming a slot 130 extending axially from the top. A columnar limiting member 500 is inserted into the slot 130. Preferably, the limiting member 500 is a columnar pin, including a columnar body portion 510. During assembly, the limiting member 500 is first inserted into the slot 130, and then the pump cover 300 is placed on the pump body 100 and fixedly connected to the pump body 100 with screws. After installation, the axial side of the limiting member 500 abuts against the retaining ring 200, and the other axial side abuts against the pump cover 300. This design is simple and facilitates the assembly of the limiting part. Furthermore, to ensure that the limiting member 500 is radially secured to the slot and to prevent it from falling off due to vibration during operation, both the slot 130 and the limiting member 500 have dovetail-shaped radial sections. Of course, as in other embodiments, the radial sections of the limiting member 500 and the slot 130 can be triangular, trapezoidal, or other structures.

[0026] See Figure 2 , Figure 4 and Figure 5 In a preferred embodiment, the retaining ring 200 includes an annular retaining ring body 210 and a mounting boss 211 protruding from the axial end face of the retaining ring body 210 facing the pump cover. The radial inner wall surface of the mounting boss 211 protrudes inward to form a protrusion 212, and the pump body 100 is recessed in the radial outer wall surface adjacent to the second annular surface 120 to form a recess 140. In an assembled configuration, the protrusion 212 of the retaining ring 200 is inserted into the recess 140 of the pump body 100. This design increases the contact area between the limiting member 500 and the retaining ring 200, preventing the retaining ring 200 from being damaged by the limiting member 500 due to insufficient thickness. Furthermore, the design of the protrusion 212 prevents the retaining ring 200 from rotating circumferentially during operation, which could reduce the stability of the connection with external equipment. This improves the service life of the retaining ring while ensuring the stability of the connection with the electronic oil pump. Furthermore, in order to increase the contact area between the limiting member 500 and the retaining ring 200 and reduce the risk of the retaining ring 200 being crushed, the radial surface of the main body 510 of the limiting member 500 in this embodiment also has an outward protrusion 520. When the limiting member 500 is assembled, its outward protrusion 520 abuts against the axial surface of the mounting boss 211.

[0027] See Figure 1 and Figure 3The bottom cover 600 of this invention has an annular first boss 611 protruding axially towards the end face of the pump body 100, and the pump body 100 has an annular groove 150 opposite the first boss 611 recessed axially towards the end face of the pump cover 600. The bottom cover 600 is ultrasonically welded to the pump body 100. This design securely welds the bottom cover to the pump body while reducing the generation of welding flash.

[0028] Furthermore, see Figure 3 The bottom cover 600 also has a second annular protrusion 612 protruding axially towards the end face of the pump body 100. The radial outer wall surface of the second protrusion 612 is fused together with the inner wall surface of the pump body 100 on the side away from the pump cover 300 by ultrasonic welding. Through the above design, the bottom cover 600 and the pump body 100 can be radially fused together, preventing liquid outside the pump body 100 from seeping into the cavity formed by the pump body 100 and the bottom cover 600, which could cause short circuits and damage to the electrical components in the cavity, and further improve the stability of the electronic oil pump operation.

Claims

1. An electronic oil pump with improved pump body structure, comprising a pump body (100), a pump cover (300) fixed to an axial side of the pump body, characterized in that: The pump body (100) has a shoulder (160) in the middle section. An annular retaining ring (200) is fitted between the shoulder (160) and the pump cover (300). The retaining ring (200) and the shoulder (160) are clamped to form an installation groove (10). A sealing ring (400) is provided in the installation groove (10). The pump cover (300) is fixed on the pump body (100) and restricts the axial movement of the retaining ring (200).

2. The electric oil pump according to claim 1, characterized in that: The pump body (100) has a first annular surface (110) and a second annular surface (120) that bulge out in the middle section toward the pump cover (300). The outer diameter of the second annular surface (120) is smaller than the outer diameter of the first annular surface (110). The second annular surface (120) and the first annular surface (110) are adjacent to each other to form the shoulder (160).

3. The electric oil pump of claim 1, wherein: The pump cover (300) is fixed to the pump body (100) and restricts the axial movement of the retaining ring (200). Specifically, the radial surface of the pump body (100) on the side axially close to the pump cover (300) is recessed to form a slot (130) extending axially from the top. A columnar limiting member (500) is inserted into the slot (130). One axial end of the limiting member (500) abuts against the retaining ring (200), and the other side abuts against the pump cover (300).

4. The electric oil pump according to claim 3, characterized in that: Both the slot (130) and the limiting member (500) have a dovetail-shaped radial cross section.

5. An electric oil pump according to claim 3 or 4, characterized in that: The retaining ring (200) has a mounting boss (211) protruding on the axial end face facing the pump cover (300). The radial inner wall surface of the mounting boss (211) protrudes inward to form a protrusion (212). The radial outer wall surface of the pump body (100) is recessed to form a concave portion (140) for the protrusion (212) to be inserted.

6. The electric oil pump according to claim 5, characterized in that: The limiting member (500) includes a columnar main body (510) and an outer protrusion (520) protruding from the radial surface of the main body (510), the outer protrusion (520) abutting against the axial surface of the mounting boss (211).

7. The electronic oil pump according to claim 1, characterized in that: It also includes a bottom cover (600) disposed on one side of the pump body (100) in the axial direction. The bottom cover (600) has a first annular boss (611) protruding axially toward the end face of the pump body. The pump body (100) is recessed axially toward the end face of the bottom cover (600) to form an annular groove (150) opposite to the first boss (611). The bottom cover (600) is welded and fixed to the pump body (100).

8. The electronic oil pump according to claim 7, characterized in that: The bottom cover (600) also has a second annular protrusion (612) protruding towards the end face of the pump body. The radial outer wall surface of the second protrusion (612) is connected to the inner wall surface of the pump body (100) away from the pump cover by welding.

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