Oil pump cover and oil pump and output flow regulation method

Abstract

The application provides an oil pump cover, an oil pump and an output flow adjusting method, and relates to the technical field of engine lubrication. The oil pump cover comprises: a first mounting hole arranged on a pump cover body; a control element arranged in the first mounting hole and used for signal connection with an engine electronic control unit; a second mounting hole in communication with an outlet of a positive pressure pump cavity and an inlet of a negative pressure pump cavity; and an oil pump output flow control execution mechanism arranged in the second mounting hole, wherein the control element is used for controlling the communication amount of the positive pressure pump cavity and the negative pressure pump cavity through the oil pump output flow control execution mechanism. Under the control of the engine electronic control unit, the oil pump of the application can automatically adjust the actual output flow according to the working condition of the engine, and can adapt to different working conditions of the engine.

Description

Technical Field

[0001] This application relates to the technical field of engine lubrication, and more particularly to an oil pump cover, an oil pump, and a method for regulating output flow. Background Technology

[0002] As the heart of the engine lubrication system, the oil pump's main function is to deliver oil to the friction surfaces of various engine parts for lubrication, ensuring the reliability of engine operation.

[0003] The mainstream oil pump is the rotary oil pump. However, the rotary oil pump does not have the function of automatically adjusting the output flow according to the engine's operating conditions, making it difficult to adapt to different engine operating conditions. Summary of the Invention

[0004] This application provides an oil pump cover, an oil pump, and an output flow adjustment method. Under the control of the engine electronic control unit, the rotary oil pump can automatically adjust the output flow according to the engine's operating conditions, thus adapting to different engine operating conditions.

[0005] In a first aspect, this application provides an oil pump cover, comprising: a pump cover body, wherein the pump cover body is provided with an oil suction port, a negative pressure pump chamber and a positive pressure pump chamber, wherein the inlet of the oil suction port is used to communicate with the main oil passage of the engine, the outlet of the oil suction port is connected to the inlet of the negative pressure pump chamber, the outlet of the negative pressure pump chamber is connected to the inlet of the positive pressure pump chamber, and the outlet of the positive pressure pump chamber is used to communicate with the output port of the oil pump;

[0006] Also includes:

[0007] The first mounting hole is provided on the pump cover body;

[0008] A control component, disposed within the first mounting hole, is used for signal connection with the engine electronic control unit;

[0009] The second mounting hole is connected to both the outlet of the positive pressure pump chamber and the inlet of the negative pressure pump chamber;

[0010] An oil pump output flow control actuator is disposed inside the second mounting hole. The engine electronic control unit controls the movement of the oil pump output flow control actuator within the second mounting hole through a control component to control the communication between the positive pressure pump chamber and the negative pressure pump chamber.

[0011] An oil inlet is provided on the pump cover body, and the oil inlet is used to communicate with the engine main oil passage;

[0012] A narrow oil passage is located inside the pump cover body, with one end connected to the oil inlet and the other end connected to the input port of the control component.

[0013] The control oil passage is located inside the pump cover body, with one end connected to the output port of the control component and the other end connected to the second mounting hole.

[0014] In one of the above-mentioned optional technical solutions for an oil pump cover, the control component is a proportional valve.

[0015] In one of the above-mentioned optional technical solutions for an oil pump cover, a sealing ring is provided between the control component and the port of the first mounting hole.

[0016] In one of the above-mentioned optional technical solutions for an oil pump cover, the oil pump output flow control actuator includes a double-ended piston, a return spring, and a screw plug;

[0017] The double-ended piston has a reflux chamber, which is used to connect the outlet of the positive pressure pump chamber with the inlet of the negative pressure pump chamber and control the amount of communication between the positive pressure pump chamber and the negative pressure pump chamber.

[0018] The two ends of the return spring respectively abut against the double-ended piston and the screw plug;

[0019] The screw plug is fixedly disposed at the opening of the second mounting hole, and the screw plug is used to limit the return spring.

[0020] In one of the above-mentioned optional technical solutions for an oil pump cover, the screw plug is a hollow cylindrical screw plug, and the inner wall of the screw plug is provided with a limiting ring for abutting the return spring.

[0021] In one of the above-mentioned optional technical solutions for an oil pump cover, the end of the double-ended piston facing the return spring is provided with a positioning blind hole for accommodating the return spring, and the corresponding end of the return spring is located inside the positioning blind hole.

[0022] In one of the above-mentioned optional technical solutions for an oil pump cover, a sealing ring is provided between the screw plug and the port of the second mounting hole.

[0023] In one of the above-mentioned optional technical solutions for an oil pump cover, a shaft hole for mounting a rotor shaft is provided in the middle of the pump cover body, and the narrow oil passage is also connected to the shaft hole.

[0024] Secondly, this application provides an oil pump, including a pump body and an oil pump cover as described above, wherein the oil pump cover is disposed on the pump body.

[0025] Thirdly, this application provides a method for adjusting the output flow of an oil pump, using the aforementioned oil pump cover. The method for adjusting the output flow of the oil pump includes the following steps:

[0026] The connection between the narrow oil passage and the control oil passage is controlled by the control components.

[0027] Oil is drawn from the engine's main oil passage through the oil inlet, and then supplied to the second mounting hole through the narrow oil passage and the control oil passage in sequence, so that the oil drives the oil pump output flow control actuator to move within the second mounting hole.

[0028] The oil pump output flow control actuator controls the connection between the positive pressure pump chamber and the negative pressure pump chamber, thereby controlling the return flow of the oil pump output flow. The return flow is recirculated within the oil pump, thereby adjusting the actual output flow of the oil pump.

[0029] This application provides an oil pump cover, an oil pump, and a method for adjusting the output flow. The engine electronic control unit controls the operation of the control components, drawing oil from the engine's main oil passage through the oil inlet and connecting the narrow oil passage to the control oil passage. Oil is then supplied to the inside of the second mounting hole through the control oil passage. The oil pump output flow control actuator moves within the second mounting hole, controlling the connection between the positive pressure pump chamber and the negative pressure pump chamber, thereby controlling the return flow of the oil pump output flow. This return flow is recirculated within the oil pump, thus automatically adjusting the actual output flow of the oil pump. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0031] Figure 1 This is a schematic diagram of the structure of an oil pump cover provided in an embodiment of this application;

[0032] Figure 2 This is an exploded structural diagram of an oil pump cover provided in an embodiment of this application;

[0033] Figure 3 This is a structural schematic diagram of the inner side of an oil pump cover provided in an embodiment of this application;

[0034] Figure 4 A cross-sectional view of an oil pump cover provided in an embodiment of this application;

[0035] Figure 5 A cross-sectional view of a hidden control component and an oil pump output flow control actuator in an oil pump cover, provided as an embodiment of this application;

[0036] Figure 6 Provided for the embodiments of this application Figure 4 A cross-sectional view along the AA direction;

[0037] Figure 7 Provided for the embodiments of this application Figure 4 Cross-sectional view along the BB direction;

[0038] Figure 8 A cross-sectional view of a screw plug in an oil pump cover provided in an embodiment of this application;

[0039] Figure 9 A flowchart of a method for adjusting the output flow rate of an oil pump provided in this application embodiment;

[0040] Figure 10 A partial cross-sectional view of an oil pump cover in which the negative pressure pump chamber and the positive pressure pump chamber are not connected, provided in an embodiment of this application;

[0041] Figure 11 This is a partial cross-sectional view of an oil pump cover in which the negative pressure pump chamber and the positive pressure pump chamber are connected, as provided in an embodiment of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100-pump cover body;

[0044] 101 - Oil suction port;

[0045] 102 - Negative pressure pump chamber;

[0046] 103 - Positive pressure pump chamber;

[0047] 104 - First mounting hole;

[0048] 105 - Second mounting hole;

[0049] 106-Oil port;

[0050] 107 - Narrow oil passage;

[0051] 108 - Control oil passage;

[0052] 109 - Shaft hole;

[0053] 200 - Control components;

[0054] 300 - Oil pump output flow control actuator;

[0055] 310 - Double-ended piston;

[0056] 311 - Reflux chamber;

[0057] 312 - Positioning blind hole;

[0058] 320 - Return spring;

[0059] 330-Screw Plug;

[0060] 331 - Limiting ring.

[0061] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0062] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0063] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0064] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0065] In this application, the terms "exemplarily" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplarily" or "for example" in this application should not be construed as being more alternative or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0066] As described in the background section, the oil pump, as the heart of the engine lubrication system, primarily functions to deliver oil to the friction surfaces of various engine parts for lubrication, ensuring the reliability of engine operation.

[0067] The mainstream oil pump is the rotary oil pump. However, the rotary oil pump does not have the function of automatically adjusting the output flow according to the engine's operating conditions, making it difficult to adapt to different engine operating conditions.

[0068] To address the aforementioned technical problems, this application provides an oil pump cover, an oil pump, and a method for adjusting the output flow rate. The engine electronic control unit controls the operation of a control component, drawing oil from the engine's main oil passage through the oil inlet and connecting the narrow oil passage to the control oil passage. Oil is then supplied to the second mounting hole through the control oil passage. The oil pump output flow rate control actuator moves within the second mounting hole, controlling the connection between the positive and negative pressure pump chambers, thereby controlling the return flow rate of the oil pump output flow rate. This return flow rate is recirculated within the oil pump, thus automatically adjusting the actual output flow rate of the oil pump.

[0069] The technical solution of this application and how it solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The following will be combined with the appendix... Figure 1-11 The embodiments of this application will be described below.

[0070] Firstly, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This application provides an oil pump cover, including: a pump cover body 100, on which an oil suction port 101, a shaft hole 109, a negative pressure pump chamber 102, and a positive pressure pump chamber 103 are integrally formed. The oil suction port 101 is located at the edge of the pump cover body 100. The negative pressure pump chamber 102 and the positive pressure pump chamber 103 are both located in the middle of the pump cover body 100 and are arranged circumferentially about the center of the pump cover body 100. The shaft hole 109 is located at the center of the pump cover body 100 and is located between the negative pressure pump chamber 102 and the positive pressure pump chamber 103. The shaft hole 109 is used to install a rotor shaft. The inlet of the oil suction port 101 is used to communicate with the main oil passage of the engine. The outlet of the oil suction port 101 is used to communicate with the inlet of the negative pressure pump chamber 102. The outlet of the negative pressure pump chamber 102 is used to communicate with the inlet of the positive pressure pump chamber 103. The outlet of the positive pressure pump chamber 103 is used to communicate with the output port of the oil pump.

[0071] Specifically, when the oil pump is working, it relies on the volume change law. The oil in the oil pan enters the pump cover body 100 from the oil inlet 101, and then enters the negative pressure pump chamber 102. After circulating in the oil pump, the oil is finally discharged to the oil pump outlet at the corresponding position in the positive pressure pump chamber 103, thereby realizing the pumping and circulation of oil.

[0072] Please refer to Figure 1 , Figure 2 and Figure 3 The pump cover body 100 also has an integrally formed first mounting hole 104, and a control component 200 is fixedly connected in the first mounting hole 104. The control component 200 is connected to the engine electronic control unit.

[0073] Please refer to Figure 1 , Figure 2 and Figure 3 The pump cover body 100 is also integrally formed with a second mounting hole 105, which is connected to the outlet of the positive pressure pump chamber 103 and the inlet of the negative pressure pump chamber 102. An oil pump output flow control actuator 300 is fixedly installed in the second mounting hole 105. The control component 200 is used to control the communication between the positive pressure pump chamber 103 and the negative pressure pump chamber 102 through the oil pump output flow control actuator 300.

[0074] Please refer to Figure 1 , Figure 2 and Figure 3 The pump cover body 100 has an integrally formed oil inlet 106. The oil inlet 106 is far away from the oil suction port 101. The oil inlet 106 is used to connect with the main oil passage of the engine.

[0075] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 The pump cover body 100 has an integrally formed narrow oil passage 107 inside. One end of the narrow oil passage 107 is connected to the oil inlet 106, and the other end of the narrow oil passage 107 is connected to the input port of the control component 200.

[0076] Please refer to Figure 1 , Figure 2 and Figure 3 The pump cover body 100 has an integrally formed control oil passage 108 inside. One end of the control oil passage 108 is connected to the output port of the control component 200, and the other end of the control oil passage 108 is connected to the second mounting hole 105.

[0077] Specifically, under the control of the engine electronic control unit, the control component 200 controls the communication between the narrow oil passage 107 and the control oil passage 108. The control component 200 draws engine oil from the main oil passage through the narrow oil passage 107 and supplies oil into the second mounting hole 105 sequentially through the narrow oil passage 107 and the control oil passage 108. This causes the oil to drive the oil pump output flow control actuator 300 to move within the second mounting hole 105, thereby controlling the communication between the positive pressure pump chamber 103 and the negative pressure pump chamber 102. This, in turn, controls the return flow of the oil pump output flow. This return flow is recirculated within the oil pump, thus automatically adjusting the actual output flow of the oil pump according to the engine's operating conditions. This achieves the effect of the rotary oil pump automatically adjusting its output flow according to the engine's operating conditions under the control of the engine electronic control unit, adapting to different engine operating conditions.

[0078] Please refer to Figure 2In some embodiments provided in this application, the control element 200 can be a proportional valve, specifically, the proportional valve can continuously and proportionally control the pressure and flow of the hydraulic system, realize precise control of the position, speed and force of the actuator, reduce the impact during pressure changes, and simplify the oil circuit.

[0079] Please refer to Figure 2 and Figure 4 In some embodiments provided in this application, a sealing ring is provided between the control element 200 and the port of the first mounting hole 104, and the sealing ring is fitted over the control element 200. Specifically, the sealing ring can ensure the sealing of the connection between the control element 200 and the port of the first mounting hole 104, ensuring that the oil circuit is in a sealed and leak-free state.

[0080] Please refer to Figure 4 and Figure 7 In some embodiments provided in this application, for example, the end of the elongated oil passage 107 away from the oil inlet 106 is also connected to the shaft hole 109. Specifically, clean oil can be introduced into the shaft hole 109 through the elongated oil passage 107 to lubricate the rotor shaft.

[0081] Please refer to Figure 2 , Figure 4 and Figure 5 In some embodiments provided in this application, the oil pump output flow control actuator 300, exemplarily, includes a double-ended piston 310, a return spring 320, and a screw plug 330. The double-ended piston 310 has a return chamber 311, which connects the outlet of the positive pressure pump chamber 103 to the inlet of the negative pressure pump chamber 102 and controls the flow between the positive pressure pump chamber 103 and the negative pressure pump chamber 102. The two ends of the return spring 320 abut against the double-ended piston 310 and the screw plug 330, respectively. The screw plug 330 is fixedly connected to the opening of the second mounting hole 105. Specifically, the screw plug 330 can be damped in conjunction with the second mounting hole 105, or it can be threaded into the second mounting hole 105. The screw plug 330 is used to limit the return spring 320.

[0082] Please refer to Figure 2 , Figure 4 and Figure 8In some embodiments provided in this application, the screw plug 330 is further described as a hollow cylindrical screw plug 330, with both ends of the screw plug 330 being open. The inner wall of the screw plug 330 is integrally formed with a limiting ring 331 for abutting against the return spring 320. Specifically, considering that when the double-ended piston 310 moves inside the second mounting hole 105, the cavity where the return spring 320 is located must undergo a volume change, if the screw plug 330 is set as a solid screw plug 330, the cavity between the screw plug 330 and the double-ended piston 310 may become a closed cavity, thus hindering the reciprocating movement of the double-ended piston 310. Therefore, the screw plug 330 is set with both ends open to prevent the cavity between the screw plug 330 and the double-ended piston 310 from becoming a closed cavity, ensuring that the double-ended piston 310 can reciprocate smoothly.

[0083] Please refer to Figure 2 and Figure 4 In some embodiments provided in this application, exemplarily, the end of the double-ended piston 310 facing the return spring 320 is provided with a positioning blind hole 312 for accommodating the return spring 320. The corresponding end of the return spring 320 is located inside the positioning blind hole 312, and the return spring 320 fits against the circumferential inner wall of the positioning blind hole 312. Specifically, the double-ended piston 310 can limit the return spring 320 to a certain extent through the positioning blind hole 312, so that the expansion and contraction of the return spring 320 is more stable.

[0084] Please refer to Figure 4 In some embodiments provided in this application, a sealing ring is provided between the screw plug 330 and the port of the second mounting hole 105, and the sealing ring is fitted over the screw plug 330. Specifically, the sealing ring can strengthen the connection strength and stability between the screw plug 330 and the second mounting hole 105.

[0085] Secondly, this application also provides an oil pump, including a pump body and the aforementioned oil pump cover, the oil pump cover being mounted on the pump body.

[0086] Thirdly, this application also provides a method for adjusting the output flow of an oil pump, using the aforementioned oil pump cover. The method for adjusting the output flow of an oil pump includes the following steps:

[0087] S101, please refer to Figure 9 , Figure 10 and Figure 11 The connection between the narrow oil passage 107 and the control oil passage 108 is controlled by the control element 200.

[0088] S102, please refer to Figure 9 , Figure 10 and Figure 11Oil is drawn from the main oil passage of the engine through the oil inlet 106, and then supplied to the second mounting hole 105 through the narrow oil passage 107 and the control oil passage 108 in sequence, so that the oil drives the oil pump output flow control actuator 300 to move within the second mounting hole 105.

[0089] S103, please refer to Figure 9 , Figure 10 and Figure 11 The oil pump output flow control actuator 300 controls the connection between the positive pressure pump chamber 103 and the negative pressure pump chamber 102, thereby controlling the return flow of the oil pump output flow. The return flow is recirculated in the oil pump, thereby adjusting the actual output flow of the oil pump.

[0090] Specifically, the engine electronic control unit controls the control element 200 to control the communication between the narrow oil passage 107 and the control oil passage 108. Oil is drawn from the engine main oil passage through the oil inlet 106 and supplied to the second mounting hole 105 in sequence through the narrow oil passage 107 and the control oil passage 108. The oil pump output flow control actuator 300 moves within the second mounting hole 105 to control the communication between the positive pressure pump chamber 103 and the negative pressure pump chamber 102, thereby controlling the return flow of the oil pump output flow. This return flow will be recirculated within the oil pump, thereby automatically adjusting the actual output flow of the oil pump.

[0091] Furthermore, according to the requirements of the engine lubrication system, the preset oil pressure map for each operating condition is written into the engine electronic control unit in advance. The engine electronic control unit has a storage module and a comparison module, and the preset oil pressure map is stored in the storage module.

[0092] After the engine is started, the engine has an operating condition monitoring unit that monitors various operating parameters of the engine in real time, substitutes the monitoring results into the preset oil pressure diagram, obtains the required target oil pressure, and transmits the target oil pressure signal to the comparison module.

[0093] Meanwhile, the engine has an oil pressure sensor, which transmits the monitored actual oil pressure signal to the comparison module.

[0094] The comparison module compares the target oil pressure signal with the actual oil pressure signal and adjusts the duty cycle signal output to the control unit 200. The control unit 200, by adjusting the oil pressure inside the control oil passage 108 and cooperating with the return spring 320, adjusts the position of the double-ended piston 310 to control the connection between the positive pressure pump chamber 103 and the negative pressure pump chamber 102 (please refer to...). Figure 10 and Figure 11This controls the return flow of the oil pump output flow. This return flow will be recirculated within the oil pump, thereby automatically adjusting the actual output flow of the oil pump.

[0095] Other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the technical solutions disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0096] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

[0097] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0098] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0099] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0100] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0101] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An oil pump cover, comprising: The pump cover body is provided with an oil suction port, a negative pressure pump chamber and a positive pressure pump chamber. The inlet of the oil suction port is used to communicate with the main oil passage of the engine. The outlet of the oil suction port is connected to the inlet of the negative pressure pump chamber. The outlet of the negative pressure pump chamber is connected to the inlet of the positive pressure pump chamber. The outlet of the positive pressure pump chamber is used to communicate with the output port of the oil pump. Its characteristic is that it further includes: The first mounting hole is provided on the pump cover body; A proportional valve is disposed in the first mounting hole and is used for signal connection with the engine electronic control unit; The second mounting hole is connected to both the outlet of the positive pressure pump chamber and the inlet of the negative pressure pump chamber; An oil pump output flow control actuator is disposed inside the second mounting hole. The engine electronic control unit controls the movement of the oil pump output flow control actuator within the second mounting hole via a proportional valve to control the communication between the positive pressure pump chamber and the negative pressure pump chamber. An oil inlet is provided on the pump cover body, and the oil inlet is used to communicate with the engine main oil passage; A shaft hole is provided at the center of the pump cover body and located between the negative pressure pump chamber and the positive pressure pump chamber. The shaft hole is used to install the rotor shaft. A narrow oil passage is provided inside the pump cover body, with one end connected to the oil inlet and the other end connected to the input port of the proportional valve. The end of the narrow oil passage away from the oil inlet is also connected to the shaft hole. The control oil passage is located inside the pump cover body, with one end connected to the output port of the proportional valve and the other end connected to the second mounting hole; The oil pump output flow control actuator includes a double-ended piston, a return spring, and a screw plug; The double-ended piston has a reflux chamber, which is used to connect the outlet of the positive pressure pump chamber with the inlet of the negative pressure pump chamber and control the amount of communication between the positive pressure pump chamber and the negative pressure pump chamber. The two ends of the return spring respectively abut against the double-ended piston and the screw plug; The screw plug is fixedly disposed at the opening of the second mounting hole, and the screw plug is used to limit the return spring; The engine electronic control unit (ECU) stores preset oil pressure diagrams for various operating conditions. The ECU obtains the target oil pressure signal by looking up operating parameters transmitted from the engine's operating condition monitoring unit and the actual oil pressure signal from the engine's oil pressure sensor. By comparing the target oil pressure signal with the actual oil pressure signal, the ECU adjusts the duty cycle signal output to the proportional valve to control the oil pressure in the control oil passage. With the cooperation of the return spring, the ECU also adjusts the position of the double-ended piston, thereby controlling the communication between the positive and negative pressure pump chambers.

2. The oil pump cover according to claim 1, characterized in that, A sealing ring is provided between the proportional valve and the port of the first mounting hole.

3. An oil pump cover according to claim 1 or 2, characterized in that, The plug is a hollow cylindrical plug, and the inner wall of the plug is provided with a limiting ring for abutting against the reset spring.

4. An oil pump cover according to claim 1 or 2, characterized in that, The double-ended piston has a positioning blind hole at its end facing the return spring for accommodating the return spring, and the corresponding end of the return spring is located inside the positioning blind hole.

5. An oil pump cover according to claim 1 or 2, characterized in that, A sealing ring is provided between the screw plug and the port of the second mounting hole.

6. An oil pump, characterized in that, The pump includes a pump body and an oil pump cover as described in any one of claims 1-5, wherein the oil pump cover is disposed on the pump body.

7. A method for adjusting the output flow rate of an oil pump, using an oil pump cover as described in any one of claims 1-5, characterized in that, The method for adjusting the output flow of the oil pump includes the following steps: The connection between the narrow oil passage and the control oil passage is controlled by a proportional valve. Oil is drawn from the engine's main oil passage through the oil inlet, and then supplied to the second mounting hole through the narrow oil passage and the control oil passage in sequence, so that the oil drives the oil pump output flow control actuator to move within the second mounting hole. The oil pump output flow control actuator controls the connection between the positive pressure pump chamber and the negative pressure pump chamber, thereby controlling the return flow of the oil pump output flow. The return flow is recirculated within the oil pump, thereby adjusting the actual output flow of the oil pump.

Images