Oil pump with pressure control cavity

Abstract

The utility model provides an oil pump with a pressure control cavity, which comprises a pump shell and a movable element arranged in a cavity of the pump shell, the pressure control cavity is formed between a part of the movable element and the inner wall of the pump shell, a feedback oil channel is arranged on the pump shell, and the pressure control cavity is communicated with the feedback oil channel. The feedback oil duct is used for leading pressure oil from the main oil duct into the pressure control cavity, and an exhaust hole communicated with the feedback oil duct is further formed in the position, close to the pressure control cavity, of the pump shell. After the exhaust hole communicated with the feedback oil duct is formed in the position, close to the pressure control cavity, of the pump shell, tests prove that air in the feedback oil duct can be rapidly exhausted after an engine is started, and oil pressure of the engine is rapidly stabilized.

Description

TECHNICAL FIELD

[0001] The utility model relates to internal combustion engine lubricating system, concretely relates to an oil pump with pressure control cavity. BACKGROUND

[0002] With the continuous progress of the design technology of the oil pump, the newly designed oil pump mostly adopts the main oil channel oil to control the work of the oil pump. The fixed displacement pump adjusts the outlet pressure of the oil pump by controlling the opening of the pressure limiting valve, and the variable displacement pump adjusts the outlet pressure of the oil pump by controlling the movement of the variable displacement slider, to meet the actual demand of the engine. However, the following problems exist in the actual application process: according to the feedback of the user, the oil pump has a certain probability of pressure fluctuation for about 3-5 minutes when starting at low temperature after a long time of shutdown. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide an oil pump with a pressure control cavity, which can ensure stable oil pressure when starting at low temperature.

[0004] In order to solve the above technical problem, the utility model adopts the following technical scheme: an oil pump with a pressure control cavity, comprising a pump shell and a movable element arranged in the cavity of the pump shell, a pressure control cavity is formed between the local part of the movable element and the inner wall of the pump shell, a feedback oil channel is arranged on the pump shell, which is used for introducing pressure oil from the main oil channel to the pressure control cavity, and an exhaust hole in communication with the feedback oil channel is arranged on the pump shell near the position of the pressure control cavity.

[0005] In the above technical scheme, the reason why the exhaust hole in communication with the feedback oil channel is arranged on the pump shell near the position of the pressure control cavity is that the inventors find through repeated research and analysis that oil leakage will occur in the feedback oil channel from the main oil channel of the engine to the oil pump after the oil pump is shutdown for a long time, so that the feedback oil channel is filled with air. When the engine starts at low temperature, the oil viscosity increases greatly, and the sealing effect of the oil pump pressure limiting valve or the sealing strip gap becomes better, so that the air in the feedback oil channel is difficult to discharge at the moment, and the existence of a large amount of gas-oil mixture will cause unstable oil pressure in the feedback oil channel, and further cause fluctuation of the output pressure of the oil pump. After the exhaust hole in communication with the feedback oil channel is arranged on the pump shell near the position of the pressure control cavity, it is verified through test that the air in the feedback oil channel can be quickly discharged after the engine starts, and the engine oil pressure is quickly stabilized.

[0006] The size of the exhaust hole needs to be calculated and verified to ensure that the oil pressure of the pressure cavity does not decrease obviously, so as to avoid affecting the pressure regulation of the oil pump. As a preferred technical scheme, the size of the exhaust hole is 0.5-1mm.

[0007] In one embodiment, the oil pump is a fixed displacement pump, the movable element is a pressure limiting valve plunger; the pump housing comprises a pump body and a pump cover, the pump body is provided with a valve cavity, the valve cavity is sequentially provided with the pressure limiting valve plunger, a pressure limiting valve spring and a pressure limiting valve plug from inside to outside, a pressure control cavity is formed between the inner side end of the pressure limiting valve plunger and the inner wall of the pump body, the feedback oil passage is arranged on the pump body, and the exhaust hole is arranged on the pump body or the pump cover.

[0008] In one embodiment, the oil pump is a vane variable pump, the movable element is a variable slide, the pump housing comprises a pump body and a pump cover, the pump body is provided with a rotor cavity, the variable slide, a rotor assembly and a variable spring are arranged in the rotor cavity, a pressure control cavity is formed between one side of the variable slide and the inner wall of the pump body, the feedback oil passage is arranged on the pump body, and the exhaust hole is arranged on the pump body or the pump cover. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a structural schematic view of the embodiment 1 of the utility model;

[0010] Figure 2 It is a structural schematic view of the embodiment 2 of the utility model;

[0011] The reference signs are:

[0012] 1, pump body; 2, pump cover; 3, pressure limiting valve plunger; 4, pressure limiting valve spring; 5, pressure limiting valve plug; 6, variable slide; 7, rotor assembly; 8, variable spring; 11, pressure control cavity; 12, feedback oil passage; 13, exhaust hole. DETAILED DESCRIPTION

[0013] In order to facilitate the understanding of those skilled in the art, the utility model is further explained in combination with embodiments and drawings below, and the content mentioned in the embodiment is not a limitation on the utility model.

[0014] It needs to be explained in advance that, in the utility model, unless another explicit provision and limitation, the terms "installation", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected or integrally connected, can be directly connected or indirectly connected through an intermediate medium, and can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to specific circumstances. EMBODIMENT

[0015] As Figure 1As shown, an oil pump with a pressure control chamber 11 is a fixed displacement pump, comprising a pump body 1, a pump cover 2, and a pressure limiting valve. The pump body 1 has a valve chamber, in which a pressure limiting valve plunger 3, a pressure limiting valve spring 4, and a pressure limiting valve plug 5 are sequentially installed from the inside out. A pressure control chamber 11 is formed between the inner end of the pressure limiting valve plunger 3 and the inner wall of the pump body 1. A feedback oil passage 12 is provided on the pump body 1 for introducing pressurized oil from the main oil passage into the pressure control chamber 11. An exhaust port 13 communicating with the feedback oil passage 12 is opened on the pump body 1 or pump cover 2 near the pressure control chamber 11. Figure 1 Based on the structural characteristics of a certain type of metering pump, the vent hole 13 is set on the pump cover 2, and the diameter of the vent hole 13 is preferably 0.5 to 1 mm.

[0016] The working principle and process of this embodiment are as follows: the pressure oil in the main oil passage of the engine enters the pressure control chamber 11 through the feedback oil passage 12, which pushes the pressure limiting valve plunger 3 to move outward, thereby realizing the pressure regulation of the oil pump. When there is air in the feedback oil passage 12, it can be quickly discharged through the exhaust port 13, thereby eliminating the influence of air on the oil pump pressure and solving the problem of cold pressure fluctuation of the oil pump. Example

[0017] like Figure 2 The oil pump shown is a vane-type variable displacement pump, including a pump body 1 and a pump cover. The pump body 1 has a rotor chamber, in which a variable displacement slider 6, a rotor assembly 7, and a variable displacement spring 8 are installed. A pressure control chamber 11 is formed between one side of the variable displacement slider 6 and the inner wall of the pump body 1. The pump body 1 has a feedback oil passage 12, which is used to introduce pressurized oil from the main oil passage into the pressure control chamber 11. An exhaust port 13 communicating with the feedback oil passage 12 is opened on the pump body 1 or pump cover near the pressure control chamber 11. Figure 2 Based on the structural characteristics of a certain type of variable pump, the exhaust port 13 is set on the pump body 1, and the diameter of the exhaust port 13 is preferably 0.5 to 1 mm.

[0018] The working principle and process of this embodiment are as follows: the pressure oil in the main oil passage of the engine enters the pressure control chamber 11 through the feedback oil passage 12, which pushes the variable slider 6 to move towards the variable spring 8, thereby realizing the variable and pressure regulation of the oil pump. When there is air in the feedback oil passage 12, it can be quickly discharged through the exhaust port 13, thereby eliminating the influence of air on the oil pump pressure and solving the problem of cold pressure fluctuation of the oil pump.

[0019] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

[0020] In order to make the person skilled in the art more conveniently understand the improvement of the utility model relative to the prior art, some drawings and descriptions of the utility model have been simplified, and some other elements have also been omitted in the application file for the sake of clarity, and the person skilled in the art should realize that these omitted elements can also constitute the content of the utility model.

Claims

1. An oil pump having a pressure control chamber (11), characterized by: The pump shell and the movable element arranged in the cavity of the pump shell, the partial of the movable element and the inner wall of the pump shell form a pressure control cavity (11), the pump shell is provided with a feedback oil channel (12) for leading the pressure oil from the main oil channel to the pressure control cavity (11), the pump shell is provided with an exhaust hole (13) near the position of the pressure control cavity (11) and the exhaust hole (13) is communicated with the feedback oil channel (12).

2. Oil pump with pressure control chamber (11) according to claim 1, characterized in that The diameter of the exhaust hole (13) is 0.5-1mm.

3. Oil pump with pressure control chamber (11) according to claim 1 or 2, characterized in that: The oil pump is a constant displacement pump, and the movable element is a pressure limiting valve plunger (3).

4. Oil pump with pressure control chamber (11) according to claim 3, characterized in that The pump shell comprises a pump body (1) and a pump cover (2), the pump body (1) is provided with a valve cavity, the valve cavity is sequentially provided with the pressure limiting valve plunger (3), the pressure limiting valve spring (4) and the pressure limiting valve plug (5) from inside to outside, the pressure limiting valve plunger (3) and the inner wall of the pump body (1) form a pressure control cavity (11), the feedback oil channel (12) is arranged on the pump body (1), and the exhaust hole (13) is arranged on the pump body (1) or the pump cover (2).

5. Oil pump with pressure control chamber (11) according to claim 1 or 2, characterized in that: The oil pump is a vane variable pump, and the movable element is a variable slide (6).

6. Oil pump with pressure control chamber (11) according to claim 5, characterized in that The pump shell comprises a pump body (1) and a pump cover, the pump body (1) is provided with a rotor cavity, the rotor cavity is provided with the variable slide (6), the rotor assembly (7) and the variable spring (8), one side of the variable slide (6) and the inner wall of the pump body (1) form a pressure control cavity (11), the feedback oil channel (12) is arranged on the pump body (1), and the exhaust hole (13) is arranged on the pump body (1) or the pump cover.

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