Electronic oil pump sealed by oil seal

Abstract

The invention provides an electronic oil pump sealed by an oil seal, and belongs to the technical field of electric pumps, the electronic oil pump comprises a shell provided with a pump cavity, a rotating shaft hole and a motor cavity, and the motor cavity is communicated with the pump cavity through the rotating shaft hole; the motor shaft is rotatably connected with the rotating shaft hole, one end of the motor shaft is located in the motor cavity, and the other end of the motor shaft is located in the pump cavity; and the oil sealing piece is located between the rotating shaft hole and the motor cavity, the outer side of the oil sealing piece makes contact with the shell, the inner side of the oil sealing piece makes contact with the motor shaft, and the rotating shaft hole is separated from the motor cavity through the oil sealing piece. The motor rotor has the beneficial effects that the oil seal part is located between the rotating shaft hole and the motor cavity, the rotating shaft hole is separated from the motor cavity through the oil seal part, so that a sealing part with a complex structure is replaced by the single oil seal part, it is guaranteed that oil only flows in the rotor cavity and does not flow into the motor cavity, the structure is simple, and manufacturing and assembling are convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric pumps and relates to an electronic oil pump sealed by an oil seal. Background Art

[0002] In the existing solutions, a separate seal (controller housing, sealant, sealing ring) is required to isolate and seal the rotor cavity from the motor cavity to ensure that the oil does not flow into the motor cavity.

[0003] For example, a patent for invention with the application number CN202411183363.3 provides an integrated electronic oil pump and its working method, including a pump housing, an oil inlet hole, and an oil outlet hole, and further including: a fixed shaft disposed inside the pump housing, with a flow channel for cooling oil provided inside the fixed shaft; an internal gear eccentrically and rotatably connected to the fixed shaft; an external gear coaxially connected to the fixed shaft and rotatably connected inside the pump housing, the external gear being located outside the internal gear and meshing with the internal gear; a motor rotor fixedly connected to the outer periphery of the external gear; and a motor stator located outside the rotor and fixedly connected to the pump housing; wherein, one end of the flow channel communicates with the oil inlet hole, and the cooling oil can achieve internal circulation through the flow channel.

[0004] In summary, although some existing technical solutions can achieve the isolation of the rotor cavity and the motor cavity, the structural process is complex, and at the same time, attention needs to be paid to the problem of oil compatibility such as sealant, and there is a large room for improvement. Summary of the Invention

[0005] The object of the present invention is to provide an electronic oil pump sealed by an oil seal for the above problems existing in the prior art.

[0006] The object of the present invention can be achieved by the following technical solutions: An electronic oil pump sealed by an oil seal, comprising:

[0007] A housing provided with a pump cavity, a rotating shaft hole, and a motor cavity, the motor cavity communicating with the pump cavity through the rotating shaft hole;

[0008] A motor shaft rotatably connected to the rotating shaft hole, one end of the motor shaft being located in the motor cavity and the other end being located in the pump cavity;

[0009] An oil seal member located between the rotating shaft hole and the motor cavity, the outer side of the oil seal member contacting the housing, the inner side of the oil seal member contacting the motor shaft, and the rotating shaft hole being separated from the motor cavity by the oil seal member.

[0010] In the above-mentioned electronic oil pump sealed by an oil seal, the housing is further provided with an oil seal groove located between the rotating shaft hole and the motor cavity. The bottom of the oil seal groove communicates with the rotating shaft hole, and the opening of the oil seal groove communicates with the motor cavity. The oil seal is located in the oil seal groove.

[0011] In the above-mentioned electronic oil pump sealed by an oil seal, the housing is further provided with a first oil passage hole. A lubrication space is formed between the bottoms of the oil seal grooves. One end of the first oil passage hole communicates with the pump cavity, and the other end of the first oil passage hole communicates with the lubrication space.

[0012] In the above-mentioned electronic oil pump sealed by an oil seal, the side part of the bottom of the oil seal groove protrudes inward to form a positioning step, and the oil seal contacts the top of the positioning step.

[0013] In the above-mentioned electronic oil pump sealed by an oil seal, an installation chamfer is formed at the opening of the oil seal groove.

[0014] In the above-mentioned electronic oil pump sealed by an oil seal, the housing is further provided with a second oil passage hole. One end of the second oil passage hole communicates with the pump cavity, and the other end of the second oil passage hole communicates with the side part of the rotating shaft hole.

[0015] In the above-mentioned electronic oil pump sealed by an oil seal, it further includes a rotor assembly. The housing is further provided with a low-pressure groove and a high-pressure groove. The low-pressure groove communicates with the high-pressure groove through the pump cavity. The rotor assembly is located in the pump cavity and is used to pump oil from the low-pressure groove into the high-pressure groove.

[0016] In the above-mentioned electronic oil pump sealed by an oil seal, the housing is further provided with an oil seal groove located between the rotating shaft hole and the motor cavity. The bottom of the oil seal groove communicates with the rotating shaft hole, and the opening of the oil seal groove communicates with the motor cavity. The oil seal is located in the oil seal groove;

[0017] The housing is further provided with a first oil passage hole. A lubrication space is formed between the bottoms of the oil seal grooves. One end of the first oil passage hole communicates with the low-pressure groove, and the other end of the first oil passage hole communicates with the lubrication space.

[0018] In the above-mentioned electronic oil pump sealed by an oil seal, the housing is further provided with a second oil passage hole. One end of the second oil passage hole communicates with the high-pressure groove, and the other end of the second oil passage hole communicates with the side part of the rotating shaft hole.

[0019] In the above-mentioned electronic oil pump sealed by an oil seal, the housing is further provided with an oil inlet and an oil outlet. The oil inlet communicates with the low-pressure groove, and the oil outlet communicates with the high-pressure groove.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. The oil seal is located between the rotating shaft hole and the motor cavity, and the rotating shaft hole is separated from the motor cavity by the oil seal. Therefore, a single oil seal is used to replace the seal with a complex structure, ensuring that the oil only flows in the rotor cavity and does not flow into the motor cavity. The structure is simple and the manufacturing and assembly are convenient.

[0022] 2. The oil seal is located in the oil seal groove between the rotating shaft hole and the motor cavity. The bottom of the oil seal groove is connected to the rotating shaft hole, and the opening of the oil seal groove is connected to the motor cavity. Therefore, the oil seal can be positioned, and at the same time, the sealing performance of the oil seal can be ensured by reducing the inner diameter of the oil seal groove and adaptively reducing the outer diameter of the oil seal.

[0023] 3. One end of the first oil passage hole is connected to the pump cavity, and the other end of the first oil passage hole is connected to the lubrication space. Therefore, the pump cavity and the lubrication space are connected through the first oil passage hole to achieve oil exchange, so that the oil in the pump cavity enters the lubrication space to lubricate the motor shaft.

[0024] 4. The oil seal contacts the top of the positioning step formed by the inward protrusion of the bottom side of the oil seal groove. Therefore, the oil seal can be further positioned, and a lubrication space is formed when the side of the oil seal is installed to the bottom and contacts the positioning step. Thus, there is no need to manually control the installation position of the oil seal to reserve the lubrication space, and the sealing performance of the oil seal is further ensured.

[0025] 5. One end of the second oil passage hole is connected to the pump cavity, and the other end of the second oil passage hole is connected to the side of the rotating shaft hole. Therefore, the pump cavity and the rotating shaft hole are connected through the second oil passage hole to achieve oil exchange, so that the oil in the pump cavity enters the gap between the motor shaft and the rotating shaft hole to lubricate the motor shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an exploded view of the electric oil pump with oil seal of the present invention.

[0027] Figure 2 It is a top view of the electric oil pump with oil seal of the present invention.

[0028] Figure 3 It is Figure 2 a cross-sectional view taken along the A-A perspective of

[0029] Figure 4 It is Figure 3 an exploded view of

[0030] Figure 5 It is Figure 4 an enlarged view of the housing of

[0031] In the figure, 100 is the housing; 110 is the pump chamber; 120 is the rotating shaft hole; 130 is the motor chamber; 140 is the oil seal groove; 141 is the positioning step; 142 is the installation chamfer; 150 is the first oil passage hole; 160 is the second oil passage hole; 171 is the low-pressure groove; 172 is the high-pressure groove; 181 is the oil inlet; 182 is the oil outlet; 200 is the motor shaft; 300 is the oil seal component; 400 is the rotor assembly. Detailed implementation manners

[0032] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0034] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0035] In the present invention, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0037] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0038] like Figures 1 - 5 As shown, an oil-sealed electronic oil pump includes: a housing 100 , a motor shaft 200 and an oil seal 300 .

[0039] The housing 100 is provided with a pump chamber 110 , a shaft hole 120 and a motor chamber 130 , and the motor chamber 130 is communicated with the pump chamber 110 through the shaft hole 120 .

[0040] Specifically, the housing 100 , as the basic structure of the entire oil pump, is made of high-strength, corrosion-resistant alloy material or metal material, thereby ensuring the stability of the equipment in harsh working environments.

[0041] The motor shaft 200 is rotatably connected to the rotating shaft hole 120 , one end of the motor shaft 200 is located in the motor cavity 130 , and the other end of the motor shaft 200 is located in the pump cavity 110 .

[0042] Specifically, the motor shaft 200, as the core component of power transmission, is manufactured using a high-precision processing technology to ensure smoothness and accuracy during rotation. The motor can convert electrical energy into mechanical energy and directly act on the oil in the pump chamber 110 through the motor shaft 200, thereby achieving efficient fluid delivery function.

[0043] The oil seal 300 is located between the shaft hole 120 and the motor cavity 130 , the outer side of the oil seal 300 contacts the housing 100 , the inner side of the oil seal 300 contacts the motor shaft 200 , and the shaft hole 120 is separated from the motor cavity 130 by the oil seal 300 .

[0044] The oil seal 300 serves as an important barrier to prevent leakage and plays a key isolation role. The outer side of the oil seal 300 is in close contact with the housing 100, while the inner side forms a good fitting surface with the surface of the motor shaft 200, which can maintain excellent sealing performance under extreme conditions and effectively prevent oil from entering the motor cavity 130. At the same time, it also avoids external impurities from invading the pump cavity 110, thereby protecting the normal operation of the entire system.

[0045] More specifically, the oil seal 300 may be made of high-performance materials such as fluororubber or polytetrafluoroethylene.

[0046] In this embodiment, the oil seal 300 is located between the shaft hole 120 and the motor chamber 130. The shaft hole 120 is separated from the motor chamber 130 by the oil seal 300. Therefore, a single oil seal 300 is used to replace the seal with a complex structure, ensuring that the oil only flows in the rotor chamber and does not flow into the motor chamber 130. The structure is simple and the manufacturing and assembly are convenient.

[0047] As Figures 1 - 5 shown, on the basis of the above embodiment, the housing 100 is further provided with an oil seal groove 140. The oil seal groove 140 is located between the shaft hole 120 and the motor chamber 130. The bottom of the oil seal groove 140 communicates with the shaft hole 120, and the opening of the oil seal groove 140 communicates with the motor chamber 130. The oil seal 300 is located in the oil seal groove 140.

[0048] In this embodiment, the oil seal 300 is located in the oil seal groove 140 between the shaft hole 120 and the motor chamber 130. The bottom of the oil seal groove 140 communicates with the shaft hole 120, and the opening of the oil seal groove 140 communicates with the motor chamber 130. Therefore, the oil seal can be positioned, and at the same time, the sealing performance of the oil seal can be ensured by reducing the inner diameter of the oil seal groove 140 and adaptively reducing the outer diameter of the oil seal.

[0049] As Figures 1 - 5 shown, on the basis of the above embodiment, the housing 100 is further provided with a first oil passage hole 150. A lubrication space is formed between the bottoms of the oil seal grooves 140. One end of the first oil passage hole 150 communicates with the pump chamber 110, and the other end of the first oil passage hole 150 communicates with the lubrication space.

[0050] In this embodiment, one end of the first oil passage hole 150 communicates with the pump chamber 110, and the other end of the first oil passage hole 150 communicates with the lubrication space. Therefore, the pump chamber 110 and the lubrication space are communicated through the first oil passage hole 150 to realize the exchange of oil, so that the oil in the pump chamber 110 enters the lubrication space to lubricate the motor shaft 200.

[0051] As Figures 1 - 5 shown, on the basis of the above embodiment, the side portion of the bottom of the oil seal groove 140 protrudes inward to form a positioning step 141. The oil seal 300 contacts the top of the positioning step 141.

[0052] In this embodiment, the oil seal 300 contacts the top of the positioning step 141 formed by the inward protrusion of the side portion of the bottom of the oil seal groove 140. Therefore, the oil seal can be further positioned, and when the side portion of the oil seal is installed to the bottom and contacts the positioning step 141, a lubrication space is formed, so that there is no need to manually control the installation position of the oil seal 300 to reserve the lubrication space, and the sealing performance of the oil seal is further ensured.

[0053] like Figures 1 - 5 As shown, based on the above embodiment, the opening of the oil seal groove 140 is formed with a mounting chamfer 142 .

[0054] It should be noted here that in order to ensure the sealing performance of the oil seal, the outer diameter of the oil seal 300 needs to be slightly larger than the inner diameter of the oil seal groove 140, so that when the oil seal 300 is assembled into the oil seal groove 140, the side of the oil seal 300 is squeezed, so that it can have an elastic restoring force from the inside to the outside and press tightly against the side of the oil seal groove 140.

[0055] In this embodiment, the opening of the oil seal groove 140 is formed with an installation chamfer 142 , and the oil seal 300 can be embedded in the oil seal groove 140 through the installation chamfer 142 , so when the oil seal 300 is assembled into the oil seal groove 140 , it can be squeezed inward by the installation chamfer 142 .

[0056] like Figures 1 - 5 As shown, based on the above embodiment, the housing 100 is further provided with a second oil hole 160 , one end of the second oil hole 160 is connected to the pump chamber 110 , and the other end of the second oil hole 160 is connected to the side of the shaft hole 120 .

[0057] In this embodiment, one end of the second oil hole 160 is connected to the pump chamber 110, and the other end of the second oil hole 160 is connected to the side of the shaft hole 120. Therefore, the pump chamber 110 and the shaft hole 120 are connected through the second oil hole 160 to achieve oil exchange, so that the oil in the pump chamber 110 enters the gap between the motor shaft 200 and the shaft hole 120 to lubricate the motor shaft 200.

[0058] like Figures 1 - 5 As shown, on the basis of the above embodiment, it also includes a rotor assembly 400, the housing 100 is also provided with a low-pressure groove 171 and a high-pressure groove 171, the low-pressure groove 171 is connected to the high-pressure groove 171 through the pump chamber 110, the rotor assembly 400 is located in the pump chamber 110, and the rotor assembly 400 is used to pump oil from the low-pressure groove 171 into the high-pressure groove 171.

[0059] It is worth noting here that the rotor assembly 400 is a prior art, and is composed of an inner rotor (ie, an inner gear) and an outer rotor (ie, an outer gear). It is a conventional technical means well known to those skilled in the art and will not be elaborated here.

[0060] like Figures 1 - 5 As shown, on the basis of the above embodiment, one end of the first oil hole 150 is communicated with the low-pressure groove 171, and the other end of the first oil hole 150 is communicated with the lubrication space.

[0061] In this embodiment, one end of the first oil passage hole 150 communicates with the low-pressure groove 171, and the other end of the first oil passage hole 150 communicates with the lubrication space. Therefore, the low-pressure groove 171 and the lubrication space are communicated through the first oil passage hole 150 to achieve the exchange of oil.

[0062] As Figures 1 - 5 shown, on the basis of the above embodiment, one end of the second oil passage hole 160 communicates with the high-pressure groove 171, and the other end of the second oil passage hole 160 communicates with the side portion of the rotating shaft hole 120.

[0063] In this embodiment, one end of the second oil passage hole 160 communicates with the high-pressure groove 171, and the other end of the second oil passage hole 160 communicates with the side portion of the rotating shaft hole 120. Therefore, the high-pressure groove 171 and the rotating shaft hole 120 are communicated through the second oil passage hole 160 to achieve the exchange of oil.

[0064] It should be noted here that due to the gap between the motor shaft 200 and the rotating shaft hole 120, the oil in the second oil passage hole 160 can enter the lubrication space through the gap between the motor shaft 200 and the rotating shaft hole 120 and enter the first oil passage hole 150.

[0065] Thus, an oil circulation is formed. Since the oil pressure in the high-pressure groove 171 is relatively high, it can enter the gap between the motor shaft 200 and the rotating shaft hole 120 through the second oil passage hole 160, enter the lubrication space, and then return to the low-pressure groove 171 with a lower pressure through the first oil passage hole 150.

[0066] At the same time, since the low-pressure groove 171 is located on the side of the pump chamber 110 away from the oil inlet 181, the rotor assembly 400 can achieve double-sided oil suction during actual operation.

[0067] As Figures 1 - 5 shown, on the basis of the above embodiment, the housing 100 is further provided with an oil inlet 181 and an oil outlet 182. The oil inlet 181 communicates with the low-pressure groove 171, and the oil outlet 182 communicates with the high-pressure groove 171.

[0068] In this embodiment, oil enters from the oil inlet 181, and the rotor assembly 400 can pump the oil in the pump chamber 110 from the low-pressure groove 171 into the high-pressure groove 171 and discharge it from the high-pressure groove 171.

[0069] In addition, since the oil pressure in the high-pressure groove 171 is relatively high, it can enter the gap between the motor shaft 200 and the rotating shaft hole 120 through the second oil passage hole 160, enter the lubrication space, and then return to the low-pressure groove 171 with a lower pressure through the first oil passage hole 150.

Claims

1. An electronic oil pump sealed by an oil seal, characterized in that, Comprising: A housing, which is provided with a pump chamber, a rotating shaft hole and a motor chamber, and the motor chamber is communicated with the pump chamber through the rotating shaft hole; A motor shaft, which is rotatably connected to the rotating shaft hole, one end of the motor shaft is located in the motor chamber, and the other end of the motor shaft is located in the pump chamber; An oil seal, which is located between the rotating shaft hole and the motor chamber, the outer side of the oil seal contacts the housing, the inner side of the oil seal contacts the motor shaft, and the rotating shaft hole is separated from the motor chamber by the oil seal.

2. The electronic oil pump sealed by an oil seal according to claim 1, characterized in that: The housing is further provided with an oil seal groove, which is located between the rotating shaft hole and the motor chamber, the bottom of the oil seal groove is communicated with the rotating shaft hole, the opening of the oil seal groove is communicated with the motor chamber, and the oil seal is located in the oil seal groove.

3. The electronic oil pump sealed by an oil seal according to claim 2, characterized in that: The housing is further provided with a first oil passage hole, a lubricating space is formed between the bottoms of the oil seal grooves, one end of the first oil passage hole is communicated with the pump chamber, and the other end of the first oil passage hole is communicated with the lubricating space.

4. The electronic oil pump sealed by an oil seal according to claim 3, wherein: The side part of the bottom of the oil seal groove protrudes inwards to form a positioning step, and the oil seal contacts the top of the positioning step.

5. The electronic oil pump sealed by an oil seal according to claim 2, characterized in that: The opening of the oil seal groove forms an installation chamfer.

6. The electronic oil pump sealed by an oil seal according to claim 1, characterized in that: The housing is further provided with a second oil passage hole, one end of the second oil passage hole is communicated with the pump chamber, and the other end of the second oil passage hole is communicated with the side part of the rotating shaft hole.

7. An electronic oil pump sealed by an oil seal as claimed in claim 1, characterized in that: It further includes a rotor assembly, the housing is further provided with a low-pressure groove and a high-pressure groove, the low-pressure groove is communicated with the high-pressure groove through the pump chamber, the rotor assembly is located in the pump chamber, and the rotor assembly is used to pump oil from the low-pressure groove into the high-pressure groove.

8. The electronic oil pump sealed by an oil seal according to claim 7, wherein: The housing is further provided with an oil seal groove, which is located between the rotating shaft hole and the motor chamber, the bottom of the oil seal groove is communicated with the rotating shaft hole, the opening of the oil seal groove is communicated with the motor chamber, and the oil seal is located in the oil seal groove; The housing is further provided with a first oil passage hole, a lubricating space is formed between the bottoms of the oil seal grooves, one end of the first oil passage hole is communicated with the low-pressure groove, and the other end of the first oil passage hole is communicated with the lubricating space.

9. The electronic oil pump sealed by an oil seal according to claim 7, characterized in that: The housing is further provided with a second oil passage hole, one end of the second oil passage hole is communicated with the high-pressure groove, and the other end of the second oil passage hole is communicated with the side part of the rotating shaft hole.

10. An electronic oil pump sealed by an oil seal, characterized in that: The housing is further provided with an oil inlet and an oil outlet, the oil inlet is communicated with the low-pressure groove, and the oil outlet is communicated with the high-pressure groove.

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