A tooling and method for testing the airtightness of an electronic oil pump

Abstract

The present invention discloses a tooling and method for testing the airtightness of an electronic oil pump in the technical field of airtightness testing, including a housing. The housing is provided with a testing cavity axially communicating with and corresponding to an electronic cavity and a first accommodating cavity corresponding to a hydraulic cavity, and the radial dimension of the first accommodating cavity is smaller than that of the testing cavity, so as to form a positioning surface on the inner wall of the housing that cooperates with the lug of the casing, and a connecting threaded hole capable of axially fixedly connecting the casing and the housing is provided on the positioning surface; an end cover, the end cover is detachably and sealingly connected to one end of the housing; a second sealing ring, the second sealing ring is arranged in the first accommodating cavity and is sealingly connected between the casing and the housing; an air inlet hole, the air inlet hole is arranged at the other end of the housing and communicates with the first accommodating cavity; a vacuum pumping hole, the vacuum pumping hole communicates with the testing cavity. The tooling in the present invention can realize the vacuum pumping, pressure maintaining and leakage testing of the electronic cavity and the air filling, pressure maintaining and leakage testing of the hydraulic cavity through one-time installation and fixation.

Description

Technical Field

[0001] The present invention relates to the technical field of airtightness testing, and particularly to a tooling and method for testing the airtightness of an electronic oil pump. Background Art

[0002] An electronic oil pump, also known as an electronic engine oil pump, is a common engine oil pump. As Figure 4 、 Figure 5 shown, the electronic oil pump mainly consists of a heat dissipation rear cover 110, a housing 120, a pump cover 130, a pump shaft 170, a rotor assembly 180, and a oil seal 190. The heat dissipation rear cover 110 is installed at one end of the housing 120 and is detachably and fixedly connected to the housing 120 by screws, and a first sealing ring 140 is provided between one end of the housing 120 and the heat dissipation rear cover 110; the pump cover 130 is installed at the other end of the housing 120 and is detachably and fixedly connected to the housing 120 by screws; an electronic cavity 150 is formed between the heat dissipation rear cover 110 and the housing 120, a hydraulic cavity 160 is formed between the pump cover 130 and the housing 120, the pump shaft 170 is coaxially arranged in the housing 120, one end of the pump shaft 170 is located in the electronic cavity 150 and is in transmission connection with a driving motor, the other end of the pump shaft 170 is located in the hydraulic cavity 160 and is in transmission connection with the rotor assembly 180, and the oil seal 190 is located in the electronic cavity 150 and sleeved on the pump shaft 170 for blocking the communication between the electronic cavity 150 and the hydraulic cavity 160.

[0003] An electronic control unit (ECU) and various electronic components are installed in the electronic cavity 160 of the electronic oil pump 100. Therefore, during use, it is necessary to prevent liquid from entering the electronic cavity 160, that is, it is necessary to ensure the airtightness of the electronic cavity; at the same time, since engine oil flows in the hydraulic cavity, in order to prevent engine oil leakage, it is also necessary to ensure the airtightness of the hydraulic cavity. When performing airtightness detection at present, it is generally to first connect the inlet of the electronic oil pump to a trachea, block the outlet of the electronic oil pump, then put the electronic oil pump into water, and finally ventilate the electronic oil pump through the trachea. If no bubbles are generated at each position of the electronic oil pump, it indicates that the airtightness of the electronic oil pump is good. If bubbles appear, it indicates that the airtightness of the electronic oil pump is not good. However, the above method can only perform the airtightness detection of the hydraulic cavity and cannot perform the airtightness detection of the electronic cavity (water enters the electronic cavity and damages the electronic control unit).

[0004] Therefore, how to realize the airtightness detection of the electronic cavity and the hydraulic cavity of the electronic oil pump has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a tooling for testing the airtightness of an electronic oil pump to solve the technical problem of inconvenient airtightness detection of the electronic cavity and the hydraulic cavity of the existing electronic oil pump.

[0006] The technical solution adopted by the present invention is as follows: A tool for testing the air tightness of an electronic oil pump, the electronic oil pump includes a heat dissipation rear cover, a housing and a pump cover arranged in sequence along the axial direction, one end of the heat dissipation rear cover and the housing are fixedly connected, and a first sealing ring is arranged between the heat dissipation rear cover and the housing, the pump cover is fixedly connected to the other end of the housing; the electronic oil pump has an electronic cavity and a hydraulic cavity, and an oil seal is arranged between the electronic cavity and the hydraulic cavity; the tool includes:

[0007] A housing, the housing is provided with a test cavity corresponding to the electronic cavity and a first accommodating cavity corresponding to the hydraulic cavity, the test cavity and the first accommodating cavity are axially communicated, and the radial dimension of the first accommodating cavity is smaller than that of the test cavity, so as to form a positioning surface on the inner wall of the housing that cooperates with the lug of the housing, and a connecting threaded hole capable of axially fixedly connecting the housing and the shell is arranged on the positioning surface;

[0008] An end cover, the end cover is detachably and sealingly connected to one end of the housing;

[0009] A second sealing ring, the second sealing ring is arranged in the first accommodating cavity and is sealingly connected between the housing and the shell;

[0010] An inflation hole, the inflation hole is arranged at the other end of the housing and is communicated with the first accommodating cavity, and is used for conveying test gas into the hydraulic cavity;

[0011] A vacuum pumping hole, the vacuum pumping hole is communicated with the test cavity and is used for pumping vacuum in the test cavity.

[0012] Preferably, the housing is provided with a second accommodating cavity corresponding to the pump cover, and a third sealing ring is arranged in the second accommodating cavity, and the third sealing ring is sealingly connected between the pump cover and the housing.

[0013] Preferably, the end cover includes a cover body and an annular boss, and a plurality of connection through holes for bolt connection between the end cover and the housing are evenly distributed in a circumferential direction on the cover body; the annular boss is coaxially arranged on one side of the cover body, and a fourth sealing ring is arranged between the annular boss and the housing.

[0014] Preferably, a coaxial embedding groove is arranged on the outer circumferential surface of the annular boss, and the fourth sealing ring is embedded in the embedding groove.

[0015] Preferably, the vacuum pumping hole is coaxially arranged with the cover body.

[0016] Preferably, the materials of the housing and the end cover are aluminum alloy.

[0017] The second object of the present invention is to provide a method for testing the air tightness of an electronic oil pump, the method uses the above-mentioned tool for testing the air tightness of an electronic oil pump, and the method includes the following steps:

[0018] S10: First, place the electronic oil pump in the first accommodating cavity of the tooling, and seal and connect the second sealing ring between the housing and the casing; then fixedly connect the lug of the housing to the casing below the test cavity; finally, fixedly connect the end cap to the casing, and seal and connect the fourth sealing ring between the end cap and the casing.

[0019] S20: First, convey test gas into the hydraulic cavity of the electronic oil pump through the inflation hole until the air pressure in the hydraulic cavity reaches the test requirement; then stop inflating the hydraulic cavity and test whether the air pressure in the hydraulic cavity changes. If the air pressure remains unchanged, it proves that there is no leakage in the hydraulic cavity.

[0020] S30: First, evacuate the test cavity through the vacuum hole until the test cavity reaches the required vacuum degree; then test whether the vacuum degree in the test cavity changes. If the vacuum degree remains unchanged, it proves that there is no leakage in the electronic cavity.

[0021] Advantages of the present invention:

[0022] The present invention utilizes the spatial segmentation principle. A test cavity, a first accommodating cavity, and a second accommodating cavity are axially connected in sequence in the casing. Connecting threaded holes are provided on the positioning surface between the test cavity and the first accommodating cavity. After the housing and the pump cover of the electronic oil pump are respectively placed in the first accommodating cavity and the second accommodating cavity, the lug of the housing can be fixedly connected to the casing through connecting bolts, thereby realizing the axial fixed connection between the electronic oil pump and the casing; the present invention is provided with an inflation hole communicating with the first accommodating cavity on the casing, and high-pressure air can be conveyed into the hydraulic cavity through the inflation hole. With the isolation effect of the second sealing ring arranged between the housing and the casing on the hydraulic cavity and the test cavity, the airtightness test of the hydraulic cavity can be realized by detecting the change of the air pressure in the hydraulic cavity; the present invention is provided with a vacuum hole on the end cap, and the test cavity can be evacuated through the vacuum hole, and the airtightness test of the electronic cavity can be indirectly realized by detecting the change of the vacuum degree of the test cavity. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the tooling for testing the airtightness of the electronic oil pump of the present invention;

[0024] Figure 2 It is a three-dimensional schematic diagram of the tooling for testing the airtightness of the electronic oil pump of the present invention;

[0025] Figure 3 It is a three-dimensional schematic diagram of the end cap;

[0026] Figure 4 It is a three-dimensional schematic diagram of the electronic oil pump;

[0027] Figure 5It is a schematic structural diagram of an electronic oil pump.

[0028] Description of the reference numerals in the figure:

[0029] 100. Electronic oil pump;

[0030] 110. Heat dissipation rear cover; 120. Housing; 130. Pump cover; 140. First sealing ring; 150. Electronic cavity; 160. Hydraulic cavity; 170. Pump shaft; 180. Rotor assembly; 190. Oil seal; 111. Lug;

[0031] 200. Tooling;

[0032] 210. Housing; 220. End cover; 230. Second sealing ring; 240. Inflation hole; 250. Vacuum pumping hole; 260. Third sealing ring; 270. Fourth sealing ring;

[0033] 211. Test cavity; 212. First accommodating cavity; 213. Second accommodating cavity; 214. Connecting threaded hole;

[0034] 221. Cover body; 222. Annular boss; 223. Connecting through hole; 224. Embedded groove. Detailed implementation manners

[0035] The following further details the specific implementation manners of the present invention in conjunction with the accompanying drawings. These implementation manners are only used to illustrate the present invention and are not intended to limit the present invention.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; 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 communication inside two elements. 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.

[0038] In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more than two.

[0039] Embodiment, such as Figures 1-5 As shown, a tool for testing the airtightness of an electronic oil pump. The electronic oil pump 100 includes a heat dissipation rear cover 110, a housing 120, and a pump cover 130 arranged in sequence along the axial direction. The heat dissipation rear cover 110 is arranged at one end of the housing 120, and the heat dissipation rear cover 110 is detachably and fixedly connected to the housing 120. A first sealing ring 140 is provided between the heat dissipation rear cover 110 and the housing 120, and an electronic cavity 150 is formed between the heat dissipation rear cover 110 and the housing 120; the pump cover 130 is arranged at the other end of the housing 120, and the pump cover 130 is detachably and fixedly connected to the housing 120, and a hydraulic cavity 160 is formed between the pump cover 130 and the housing 120; a pump shaft 170 is coaxially arranged in the housing 120. One end of the pump shaft 170 extends axially into the electronic cavity 150, and the other end of the pump shaft 170 extends axially into the hydraulic cavity 160. And an oil seal 190 capable of preventing the electronic cavity 150 and the hydraulic cavity 160 from communicating with each other is provided between the pump shaft 170 and the housing 120.

[0040] The tool 200 includes a housing 210, an end cover 220, a second sealing ring 230, an inflation hole 240, and a vacuum pumping hole 250. The housing 210 is provided with a test cavity 211 corresponding to the electronic cavity 150 and a first accommodation cavity 212 corresponding to the hydraulic cavity 160. The test cavity 211 and the first accommodation cavity 212 are axially communicated, and the radial dimension of the first accommodation cavity 212 is smaller than the radial dimension of the test cavity 211, so as to form a positioning surface on the inner wall of the housing 210 that cooperates with the lug 111 of the housing 120, and a connecting threaded hole 214 capable of axially fixedly connecting the housing 120 and the housing 210 is provided on the positioning surface; the end cover 220 is detachably and sealingly connected to one end of the housing 210; the second sealing ring 230 is arranged in the first accommodation cavity 212, and the second sealing ring 230 is sealingly connected between the housing 120 and the housing 210; the inflation hole 240 is arranged at the other end of the housing 210 and communicated with the first accommodation cavity 212, and the inflation hole 240 is used to convey test gas into the hydraulic cavity 160; the vacuum pumping hole 250 is communicated with the test cavity 211, and the vacuum pumping hole 250 is used to pump the test cavity 211 to vacuum.

[0041] This application utilizes the principle of space division. Inside the housing 210, there is a test chamber 211 and a first accommodation chamber 212 that are axially connected in sequence. A connecting threaded hole 214 is provided on the positioning surface between the test chamber 211 and the first accommodation chamber 212. After the housing 120 and the pump cover 130 of the electronic oil pump 100 are accommodated in the first accommodation chamber 212, the lug 111 of the housing 120 can be fixedly connected to the housing 210 through a connecting bolt, realizing the axial fixed connection between the electronic oil pump 100 and the housing 210. An inflation hole 240 communicating with the first accommodation chamber 212 is provided on the housing 210. Test gas can be conveyed into the hydraulic chamber 160 through the inflation hole 240. With the isolation effect of the second sealing ring 230 arranged between the housing 120 and the housing 210 on the hydraulic chamber 160 and the test chamber 211, the airtightness test of the hydraulic chamber 160 can be realized through the change of the air pressure in the hydraulic chamber 160. A vacuum hole 250 is provided on the end cover 220. The test chamber 211 can be evacuated through the vacuum hole 250, and the airtightness test of the electronic chamber 150 can be indirectly realized through the change of the vacuum degree in the test chamber 211.

[0042] In a specific embodiment, as Figure 1 、 Figure 3 shown, the housing 210 further has a second accommodation chamber 213 corresponding to the pump cover 130. The test chamber 211, the first accommodation chamber 212, and the second accommodation chamber 213 are arranged and connected in sequence along the axial direction. The radial dimension of the first accommodation chamber 212 is larger than that of the second accommodation chamber 213 and smaller than that of the test chamber 211. At the same time, a third sealing ring 260 is provided in the second accommodation chamber 213. The third sealing ring 260 is sealingly connected between the pump cover 130 and the housing 210.

[0043] Such a setting is because: the second sealing ring 230 is sealingly connected between the housing 120 and the housing 210, and the third sealing ring 260 is sealingly connected between the pump cover 130 and the housing 210. The oil outlet of the electronic oil pump 100 is arranged between the housing 120 and the pump cover 130. Thus, the third sealing ring 260 can prevent the test gas entering the second accommodation chamber 213 from flowing towards the second sealing ring 230, so that the test gas flows towards the hydraulic chamber 160. At the same time, it can also prevent the test gas flowing out of the hydraulic chamber 160 from flowing towards the inflation hole 240.

[0044] In a specific embodiment, as Figure 2As shown, the end cap 220 includes a cap body 221 and an annular boss 222. The end cap 220 is disc-shaped, and a plurality of connection through holes 223 for bolt connection between the end cap 220 and the housing 210 are evenly distributed in a circumferential direction on the cap body 221. At the same time, a plurality of threaded blind holes are evenly distributed in a circumferential direction at one end of the housing 210, and the end cap 220 and the housing 210 can be fixedly connected by connecting bolts. The annular boss 222 is coaxially arranged on one side of the cap body 221, that is, after the end cap 220 and the housing 210 are fixedly connected, the annular boss 222 is located in the test chamber 211, and a fourth sealing ring 270 is provided between the annular boss 222 and the housing 210.

[0045] This is set because: by providing the annular boss 222 on the side of the end cap 220 facing the housing 210 and installing the fourth sealing ring 270 between the annular boss 222 and the housing 210, a sealed connection between the end cap 220 and the housing 210 can be achieved.

[0046] Preferably, as Figure 1 、 Figure 2 shown, a coaxial embedding groove 224 is provided on the outer circumferential surface of the annular boss 222, and the fourth sealing ring 270 is embedded in the embedding groove 224.

[0047] More preferably, as Figure 1 、 Figure 3 shown, the vacuum pumping hole 250 is coaxially arranged with the cap body 221, and the gas charging hole 240 is coaxial with the vacuum pumping hole 250.

[0048] More preferably, the materials of the housing 210 and the end cap 220 are aluminum alloy.

[0049] The usage process of the tooling in this application is as follows:

[0050] Preparation work: Place the electronic oil pump 100 in the first accommodation cavity 212 and the second accommodation cavity 213 of the tooling 200. The second sealing ring 230 is sealingly connected between the machine housing 120 and the housing 210, and the third sealing ring 260 is sealingly connected between the pump cover 130 and the housing 210. Then, fixedly connect the lug 111 of the machine housing 120 to the housing 210 below the test chamber 211 by bolts or screws. Finally, fixedly connect the end cap 220 to the housing 210 by bolts or screws, and the fourth sealing ring 270 is sealingly connected between the end cap 220 and the housing 210.

[0051] Inflation, pressure holding and leakage test of the hydraulic cavity 160: Deliver high-pressure air into the hydraulic cavity 160 of the electronic oil pump 100 through the gas charging hole 240 until the air pressure in the hydraulic cavity 160 reaches the test requirement. Then, stop supplying gas to the hydraulic cavity 160 and test whether the air pressure in the hydraulic cavity 160 changes after a specified time. If the air pressure remains unchanged, it proves that there is no leakage in the hydraulic cavity 160 and the oil seal 190 is in good sealing.

[0052] Vacuum pumping, pressure holding and leakage test of the electronic cavity 150: The test cavity 211 is evacuated through the vacuum pumping hole 250 until the required vacuum degree is reached in the test cavity 211. Then, after a specified time, check whether the vacuum degree in the test cavity 211 changes. If the vacuum degree remains unchanged, it proves that the air in the electronic cavity 150 has not flowed into the test cavity 211, that is, there is no leakage in the electronic cavity 150, and the sealing effect of the first sealing ring 140 is good.

[0053] Compared with the prior art, the present application has at least the following beneficial technical effects:

[0054] The tooling in the present application can achieve the vacuum pumping, pressure holding and leakage test of the electronic cavity and the inflation, pressure holding and leakage test of the hydraulic cavity through one-time installation and fixation, greatly reducing the labor cost and time cost. Moreover, the tooling is made of aluminum alloy and has no pipeline design, eliminating the risks of leakage and pipe explosion.

[0055] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A tool for testing the air tightness of an electronic oil pump, wherein the electronic oil pump (100) comprises a heat dissipation rear cover (110), a housing (120) and a pump cover (130) which are sequentially arranged along the axial direction. One end of the heat dissipation rear cover (110) and the housing (120) is fixedly connected, and a first sealing ring (140) is arranged between the heat dissipation rear cover (110) and the housing (120). The pump cover (130) is fixedly connected to the other end of the housing (120). The electronic oil pump (100) has an electronic cavity (150) and a hydraulic cavity (160), and an oil seal (190) is arranged between the electronic cavity (150) and the hydraulic cavity (160). It is characterized in that, The tooling fixture (200) includes: A housing (210), which is provided with a test cavity (211) corresponding to the electronic cavity (150) and a first accommodation cavity (212) corresponding to the hydraulic cavity (160). The test cavity (211) and the first accommodation cavity (212) are axially communicated, and the radial dimension of the first accommodation cavity (212) is smaller than that of the test cavity (211), so as to form a positioning surface on the inner wall of the housing (210) that cooperates with the lug (111) of the machine housing (120), and a connecting threaded hole (214) capable of axially fixedly connecting the machine housing (120) and the housing (210) is provided on the positioning surface; An end cover (220), which is detachably and sealingly connected to one end of the housing (210); A second sealing ring (230), which is arranged in the first accommodation cavity (212) and is sealingly connected between the machine housing (120) and the housing (210); An inflation hole (240), which is arranged at the other end of the housing (210) and communicated with the first accommodation cavity (212) for delivering test gas into the hydraulic cavity (160); A vacuum pumping hole (250), which is communicated with the test cavity (211) for pumping the test cavity (211) to vacuum.

2. The fixture for testing the airtightness of an electronic oil pump according to claim 1, characterized in that, The housing (210) is provided with a second accommodation cavity (213) corresponding to the pump cover (130), and a third sealing ring (260) is arranged in the second accommodation cavity (213), and the third sealing ring (260) is sealingly connected between the pump cover (130) and the housing (210).

3. The fixture for testing the air tightness of an electronic oil pump according to claim 1, wherein, The end cover (220) includes a cover body (221) and an annular boss (222). A plurality of connection through holes (223) for bolt connection between the end cover (220) and the housing (210) are evenly distributed in a circumferential direction on the cover body (221); the annular boss (222) is coaxially arranged on one side of the cover body (221), and a fourth sealing ring (270) is arranged between the annular boss (222) and the housing (210).

4. A tool for testing the airtightness of an electronic oil pump according to claim 3, characterized in that, A coaxial groove (224) is arranged on the outer circumferential surface of the annular boss (222), and the fourth sealing ring (270) is embedded in the groove (224).

5. The fixture for testing the air tightness of an electronic oil pump according to claim 3, wherein, The vacuum pumping hole (250) is coaxially arranged with the cover body (221).

6. A tool for testing the airtightness of an electronic oil pump according to claim 1, characterized in that, The materials of the housing (210) and the end cover (220) are aluminum alloy.

7. A method for testing the airtightness of an electronic oil pump, wherein the tooling for testing the airtightness of an electronic oil pump described in any one of claims 1-6 is used, and is characterized in that, The method includes the following steps: S10: First, place the electronic oil pump (100) in the first accommodation cavity (212) of the tooling fixture (200), and the second sealing ring (230) is sealingly connected between the machine housing (120) and the housing (210); then fixedly connect the lug (111) of the machine housing (120) to the housing (210) below the test cavity (211); finally, fixedly connect the end cover (220) to the housing (210), and the fourth sealing ring (270) is sealingly connected between the end cover (220) and the housing (210); S20: First, deliver test gas into the hydraulic chamber (160) of the electronic oil pump (100) through the inflation hole (240) until the air pressure in the hydraulic chamber (160) reaches the test requirement; then stop delivering gas to the hydraulic chamber (160) and test whether the air pressure in the hydraulic chamber (160) changes. If the air pressure remains unchanged, it proves that there is no leakage in the hydraulic chamber (160); S30: First, evacuate the test chamber (211) through the vacuum hole (250) until the test chamber (211) is evacuated to the required vacuum degree; then test whether the vacuum degree in the test chamber (211) changes. If the vacuum degree remains unchanged, it proves that there is no leakage in the electronic chamber (150).

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