An electric oil pump

Abstract

The present invention discloses an electric oil pump, which includes a pump body and an oil inlet distribution plate, a cavity plate, an oil outlet distribution plate, an oil pump rotor, and an armature arranged in the pump body. The pump body is provided with an oil outlet and an oil inlet. The oil inlet distribution plate, the cavity plate, and the oil outlet distribution plate are arranged in sequence along the axial direction of the pump body. The oil pump rotor is arranged in a rotor receiving hole of the cavity plate. The armature is rotatably arranged between the oil outlet distribution plate and the oil outlet. The oil pump also includes a support member and a rotating connecting member. The support member and the rotating connecting member are respectively arranged in a receiving groove on the side of the oil inlet distribution plate facing the cavity plate. One end of the armature shaft abuts against the support member and is rotatably connected to the receiving groove through the rotating connecting member. The rotation of the armature drives the rotation of the oil pump rotor. The electric oil pump of the present application has low wear during long-term operation, high armature rotation stability, low friction and noise, and a long product life. The armature commutator connection is stable, the overall product quality is high, the performance of the oil pump is guaranteed, and it helps to increase the production rate.

Description

Technical Field

[0001] The present invention relates to the technical field of oil pumps, and in particular to an electric oil pump used in an automobile exhaust after-treatment system. Background Art

[0002] With the increasing emphasis on environmental protection and the increasing popularity of automobiles, higher standards for vehicle exhaust emissions are being set. Within the vehicle's exhaust aftertreatment system, the electric fuel pump primarily supplies fuel to the HC injector. The temperature inside a properly functioning DPF filter is 350°C, which is too low to burn carbon particles. Over time, carbon particles can clog the DPF. Therefore, HC post-injection is required to heat the DPF filter to above 600°C to allow combustion.

[0003] During the entire cycle, the fuel is filtered by the filter element and then sucked out by the electric fuel pump. It is then pressurized by the electric fuel pump and sprayed out from the injector in the form of atomized oil. The atomized oil sprayed out of the nozzle combines with the harmful gases or carbon particles that have passed through the engine but not completely burned. After a series of catalytic oxidation reactions such as high temperature in the DPF, the harmful gases are converted and decomposed into gases such as carbon dioxide and nitrogen and discharged. Therefore, in order to meet the above special use conditions, the electric fuel pump itself needs to provide a particularly large liquid pressure, so that the fuel that was originally in liquid form can be discharged from the fuel injector in the form of atomization, thereby allowing the exhaust gas to burn more completely; another advantage of using an electric pump to provide high-pressure oil is that it can not only reduce the user's vehicle cost, but also reduce harm to the environment. Under the continuous influence of environmental protection concepts, the prospects for electric fuel pumps are bright. Based on this background, the electric fuel pump must have a sufficiently long service life and its performance must still meet the use requirements under long-term use. At present, the motor 001, rotor 002 and oil pump shaft 003 of the electric fuel pump are in an independent coordination state. Figure 1As shown, under these conditions, rotor 002 and motor 001 operate synchronously, while oil pump shaft 003 remains stationary. Because oil pump shaft 003 and rotor 002 are independent of each other, the hydraulic pressure within the oil pump during normal operation exerts force on rotor 002, radially squeezing oil pump shaft 003. Once wear occurs between the two, the gap between rotor 002 and oil pump shaft 003 increases. Long-term wear of oil pump shaft 003 causes irregular eccentric movement of rotor 002 during rotation, resulting in flow loss. This displacement of rotor 002 causes motor 001 to oscillate, leading to unstable contact between motor 001's commutator and brushes. This accelerates wear and degrades electric pump performance, potentially leading to malfunction and DPF clogging. This directly results in increased maintenance costs, longer maintenance cycles, and customer complaints.

[0004] Therefore, new innovations are necessary. Summary of the Invention

[0005] The purpose of the present invention is to solve at least one of the deficiencies in the prior art, and therefore proposes an electric oil pump, the specific solution of which is as follows:

[0006] An electric oil transfer pump comprises a pump body, an oil inlet distribution plate, a cavity plate, an oil outlet distribution plate, an oil pump rotor and an armature, wherein the pump body has a pump cavity, an oil outlet and an oil inlet are provided on the pump body, the oil inlet distribution plate, the cavity plate and the oil outlet distribution plate are sequentially arranged between the oil outlet and the oil inlet along the axial direction of the pump body, the oil inlet distribution plate is arranged close to the oil inlet, the cavity plate is provided with a rotor accommodating hole, the oil pump rotor is arranged in the rotor accommodating hole, and the armature is rotatably arranged on the oil outlet Between the distribution plate and the oil outlet, the electric oil pump also includes a support member and a rotating connecting member. The oil inlet distribution plate is provided with a accommodating groove on the side facing the cavity plate. The support member and the rotating connecting member are respectively arranged in the accommodating groove. One end of the rotating shaft of the armature passes through the oil outlet distribution plate and the oil pump rotor in sequence to the accommodating groove and abuts against the support member. The rotating shaft of the armature and the accommodating groove are rotatably connected by the rotating connecting member. The armature can be driven to rotate and thereby drive the oil pump rotor to rotate.

[0007] Furthermore, the rotating connecting member is a bearing, the outer ring of the bearing is fixedly connected to the accommodating groove, and the inner ring of the bearing is sleeved on the rotating shaft of the armature.

[0008] Furthermore, the support member is a metal ball.

[0009] Furthermore, a filter is provided between the oil inlet passage and the oil inlet.

[0010] Furthermore, an oil outlet joint is provided at the oil outlet.

[0011] Furthermore, the pump body includes a main body and a cover body, the main body is provided with a mounting port, the cover body is provided on the main body, the pump cavity is formed between the cover body and the main body, and the oil outlet is provided on the cover body.

[0012] Furthermore, it also includes a positioning member, which is arranged in the pump cavity. The other end of the armature shaft is rotatably connected to the positioning member, and the positioning member is provided with an overflow port.

[0013] Furthermore, it also includes magnetic tiles, brushes and connecting wires. The magnetic tiles are arranged around the armature, the brushes are connected to the commutator of the armature, and the connecting wires are electrically connected to the brushes.

[0014] Furthermore, it also includes a bracket, which is fixedly connected to the pump body.

[0015] Compared with the prior art, the electric oil pump of the present application has at least one or more of the following beneficial effects:

[0016] The electric oil pump of the present application extends the rotating shaft of the armature and fixes it to the oil inlet distribution plate through rotating connecting parts such as bearings, so that when the oil pump rotor and the armature rotating shaft are subjected to force at the same time, the radial force of the hydraulic force on the armature rotating shaft is reduced, so that the electric oil pump itself has less wear during long-term operation, greatly improving the stability of the armature rotation, and at the same time effectively reducing the friction and noise generated during the rotation of the armature, thereby increasing the service life of the product; it provides support members such as metal balls at the end of the armature rotating shaft for support and limitation, thereby greatly reducing the risk of unstable connection of the armature commutator, which is beneficial to improving the overall quality of the product, ensuring the performance of the electric oil pump, and increasing the production rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a partial cross-sectional structural diagram of an existing electric oil pump;

[0018] Figure 2 A schematic cross-sectional view of the electric oil pump provided in an embodiment of the present application;

[0019] Figure 3 for Figure 2 An enlarged schematic diagram of the structure shown near the oil inlet;

[0020] Figure 4 A schematic diagram of the positional state between the oil pump rotor and the rotor accommodating hole provided in an embodiment of the present application.

[0021] Among them, 001-motor, 002-rotor, 003-oil pump shaft, 1-pump body, 11-pump chamber, 12-oil outlet, 121-oil outlet joint, 1211-flow channel chamber, 1212-stop structure, 122-fixed groove, 13-oil inlet, 14-main body, 15-cover, 16-positioning piece, 161-rotating groove, 17-magnetic tile, 18-brush, 19-connecting wire, 20- Bracket, 2-oil inlet distribution plate, 21-accommodation groove, 3-cavity plate, 31-rotor accommodation hole, 32-gap, 4-oil outlet distribution plate, 41-fastener, 5-oil pump rotor, 51-perforation, 6-armature, 61-rotating shaft, 7-check valve, 71-spring, 72-check valve spool, 73-check valve seat, 731-valve port, 8-support, 9-rotating connection, 10-filter. DETAILED DESCRIPTION

[0022] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0023] Example

[0024] An electric oil pump comprises a pump body 1, an oil inlet distribution plate 2, a cavity plate 3, an oil outlet distribution plate 4, an oil pump rotor 5 and an armature 6.

[0025] The pump body 1 has a pump cavity 11, and an oil outlet 12 and an oil inlet 13 are provided on the pump body 1. The oil outlet 12 and the oil inlet 13 are generally provided at both ends of the pump body 1, such as Figure 2 The pump body 1 structure shown is composed of a main body 14 and a cover body 15. The main body 14 is preferably provided with a mounting port connected to its inner cavity at one end, and the cover body 15 sealing cover is provided on the mounting port. The pump chamber 11 is formed between the cover body 15 and the main body 14, and the oil outlet 12 is provided on the cover body 15. A one-way valve 7 is provided at the oil outlet 12. Preferably, an oil outlet connector 121 is provided at the oil outlet 12. Further preferably, the one-way valve 7 is fixed to the oil outlet 12 through the oil outlet connector 121. As schematically shown in the figure, a fixing groove 122 is provided at the oil outlet 12, and one end of the oil outlet connector 121 is plugged and fixed to the fixing groove 122. The oil outlet connector 121 is provided with a flow channel 1211 extending through both ends thereof. That is, when the oil outlet connector 121 is provided at the oil outlet 12, the flow channel 1211 of the oil outlet connector 121 is in communication with the pump chamber 11 and the external atmosphere, respectively. The one-way valve 7 is provided in the flow channel 1211 to open and close the flow channel 1211. Figure 2A one-way valve 7 is shown, which is composed of a spring 71, a one-way valve core 72 and a one-way valve seat 73. Specifically, a stop structure 1212 is provided on the inner wall of the flow channel cavity 1211. The spring 71, the one-way valve core 72 and the one-way valve seat 73 are all provided in the flow channel cavity 1211 and are located on the side of the stop structure 1212 facing the pump cavity 11. The one-way valve seat 73 is fixedly connected to the oil outlet joint 121, and the one-way valve seat 73 is provided close to the pump cavity 11. The one-way valve seat 73 is provided with a valve port 731 connecting the flow channel cavity 1211 and the pump cavity 11. The one-way valve core 72 is provided between the one-way valve seat 73 and the stop structure 1212. One end of the spring 71 abuts against the stop structure 1212, and the other end abuts against the one-way valve core 72. It should be noted that the spring 71 is in a compressed state when disposed within the flow channel cavity 1211, i.e., the spring 71 can continuously apply a force to the one-way valve core 72 toward the one-way valve seat 73, thereby sealing the valve port 731. In practice, when the oil pressure within the pump cavity 11 exceeds the force applied by the spring 71 to the one-way valve core 72, the one-way valve 7 will open, thereby pumping the oil within the pump cavity 11 out of the pump body 1.

[0026] The oil inlet distribution plate 2, the cavity plate 3 and the oil outlet distribution plate 4 are arranged in the pump cavity 11 and are sequentially arranged between the oil outlet 12 and the oil inlet 13 along the axial direction of the pump body 1. The oil inlet distribution plate 2 is arranged close to the oil inlet 13 and is fixedly connected to the pump body 1. The oil outlet distribution plate 4 and the cavity plate 3 are preferably fixedly connected to the oil inlet distribution plate 2. For example Figure 2 and Figure 3 As schematically shown in the figure, the oil outlet distribution plate 4 and the cavity plate 3 are fixedly connected to the oil inlet distribution plate 2 by fasteners 41 such as bolts. A rotor accommodating hole 31 is provided on the cavity plate 3. An oil inlet flow channel (not shown in the figure) is provided on the oil inlet distribution plate 2, and the oil inlet flow channel is respectively connected to the oil inlet 13 and the rotor accommodating hole 31. Preferably, a filter element 10 is also provided between the oil inlet flow channel and the oil inlet 13, and the filter element 10 is preferably a filter screen, which can filter the oil entering the pump body 1. An oil outlet flow channel (not shown in the figure) is provided on the oil outlet distribution plate 4, and the oil outlet flow channel is respectively connected to the pump cavity 11 and the rotor accommodating hole 31. The oil pump rotor 5 is arranged in the rotor accommodating hole 31. The oil pump rotor 5 is disc-shaped, and a plurality of notches are provided at intervals along the circumferential direction at the edge of the oil pump rotor 5, such as Figure 4As shown. The shape of the rotor accommodating hole 31 is non-circular, that is, a portion of its inner wall expands outward in the radial direction, so that when the oil pump rotor 5 is placed in the rotor accommodating hole 31, a portion of the inner wall of the rotor accommodating hole 31 matches the oil pump rotor 5, while a gap 32 is formed between the other portion of the inner wall and the oil pump rotor 5 for oil to pass through. Figure 4 As shown in the figure, assuming that the oil inlet channel on the oil inlet manifold plate 2 is connected to the gap 32 in the left half, and the oil outlet channel on the oil outlet manifold plate 4 is connected to the gap 32 in the right half, when the electric oil pump is operating, the oil pump rotor 5 is driven to rotate counterclockwise, driving the oil in the left half of the gap 32 to flow to the right half of the gap 32, thereby achieving oil suction.

[0027] The armature 6 is rotatably arranged between the oil outlet distribution plate 4 and the oil outlet 12. Specifically, the oil inlet distribution plate 2 is provided with a receiving groove 21 on the side facing the cavity plate 3. Figure 3 As shown. A support member 8 and a rotating connection member 9 are provided in the receiving groove 21. One end of the rotating shaft 61 of the armature 6 passes through the oil distribution plate 4 and the oil pump rotor 5 in sequence to the receiving groove 21 and abuts against the support member 8. The rotating shaft 61 of the armature 6 and the receiving groove 21 are rotatably connected via the rotating connection member 9. The supporting member 8 is preferably a metal ball, which is provided near the bottom of the receiving groove 21. Figure 3 As shown. The rotating connecting member 9 is preferably a bearing, the outer ring of the bearing is fixedly connected to the accommodating groove 21, and the inner ring of the bearing is sleeved on the rotating shaft 61 of the armature 6. The bearing itself has good wear resistance. When the oil pump rotor 5 and the rotating shaft 61 of the armature 6 are subjected to force at the same time, the radial force of the hydraulic force on the rotating shaft 61 of the armature 6 is reduced due to the wear resistance and lubricity of the bearing, thereby making the electric oil pump less prone to wear during long-term operation. Of course, the above is only a preferred solution. The support member 8 is not limited to a metal ball, but can also be other supporting structures such as a metal shaft; the rotating connecting member 9 is also not limited to a bearing, for example, it can also be other rotating connecting members 9 such as a fixed sleeve. A positioning member 16 is also provided in the pump chamber 11, and the positioning member 16 is fixedly connected to the pump body 1. The other end of the rotating shaft 61 of the armature 6 is rotatably connected to the positioning member 16. For example Figure 2 As schematically shown in FIG, the positioning member 16 is provided with a rotation groove 161 on the side facing the armature 6. The rotating shaft 61 of the armature 6 is inserted into the rotation groove 161 to form a rotational connection. The positioning member 16 is provided with an overflow port (not shown) so that the oil in the pump chamber 11 can smoothly pass through the positioning member 16 to the oil outlet 12.

[0028] The armature 6 shaft 61 rotates synchronously with the oil pump rotor 5. For example, the cross-sectional shape of the armature 6 shaft 61 corresponding to the oil pump rotor 5 can be designed to be non-circular, for example, a positioning pin structure can be provided on the armature 6 shaft 61, and the shape of the through hole 51 on the oil pump rotor 5 can be matched with the non-circular cross-sectional shape. Figure 4 As shown. This ensures that when the rotating shaft 61 of the armature 6 passes through the oil pump rotor 5, relative rotation between the rotating shaft 61 of the armature 6 and the oil pump rotor 5 does not occur, thereby ensuring that when the armature 6 is driven to rotate, the oil pump rotor 5 can also be driven to rotate within the rotor accommodating hole 31. At the same time, the oil outlet manifold 4 is fixed, ensuring the stability of the electric oil pump under high pressure. This form of cooperation between the rotating shaft 61 of the armature 6 and the oil pump rotor 5 is also the basis for the good performance of the electric oil pump.

[0029] like Figure 2 The figure shows a structure that drives the armature 6 to rotate. The structure comprises a magnetic tile 17, a brush 18, and a connecting wire 19. The magnetic tile 17 and brush 18 are both located in the pump chamber 11. The magnetic tile 17 surrounds the armature 6, and the brush 18 is connected to the commutator of the armature 6. One end of the connecting wire 19 is electrically connected to the brush 18, while the other end extends outside the pump body 1 for connection to an external device or power source. When power is applied to the connecting wire 19, electrical conduction is established between the brush 18 and the armature 6. Driven by the magnetic tile 17, the armature 6 rotates, thereby driving the oil pump rotor 5 to rotate and absorb oil. Oil enters the pump body 1 through the oil inlet 13. After being filtered by the filter element 10 to remove impurities, the oil passes through the oil inlet manifold 2, the cavity plate 3, and the oil outlet manifold 4 before flowing into the pump chamber 11. When the oil reaches the one-way valve spool 72, the pressure inside the electric oil pump gradually increases during the oil suction process. When the one-way valve opening force is reached, the oil is pumped out of the pump body 1. When the power is turned off, the oil pressure in the pump chamber 11 gradually decreases, and the one-way valve 7 closes, preventing the oil from flowing back into the external oil channel, thereby ensuring that the oil pressure of the electric oil pump remains within a stable range during operation.

[0030] The rotating shaft 61 of the armature 6 is limited by the support member 8 and the rotating connecting member 9, which can ensure the smoothness and stability of the armature 6 during rotation. At the same time, the stable operation of the armature 6 can also reduce the wear of the brush 18, and the service life of the commutator of the armature 6 will also be improved, which can effectively improve the service life and product quality of the electric oil pump. Compared with the existing technology, it is more stable and has more efficient performance.

[0031] In a further embodiment, a bracket 20 may be fixedly provided on the pump body 1, such as Figure 2 As shown, the bracket 20 is provided with a plurality of through holes, which can facilitate the fixing of the electric oil pump. It should be noted that the bracket 20 can be an independent component fixedly connected to the pump body 1, or it can be an integral structure formed on the pump body 1.

[0032] Compared with the prior art, the electric oil pump of the present application has at least one or more of the following beneficial effects:

[0033] The electric oil pump of the present application extends the rotating shaft of the armature and fixes it to the oil inlet distribution plate through rotating connecting parts such as bearings, so that when the oil pump rotor and the armature rotating shaft are subjected to force at the same time, the radial force of the hydraulic force on the armature rotating shaft is reduced, so that the electric oil pump itself has less wear during long-term operation, greatly improving the stability of the armature rotation, and at the same time effectively reducing the friction and noise generated during the rotation of the armature, thereby increasing the service life of the product; it provides support members such as metal balls at the end of the armature rotating shaft for support and limitation, thereby greatly reducing the risk of unstable connection of the armature commutator, which is beneficial to improving the overall quality of the product, ensuring the performance of the electric oil pump, and increasing the production rate.

[0034] As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0035] In this document, directional terms such as front, back, top, and bottom are defined based on the positions of components in the accompanying drawings and relative to each other, and are intended only for clarity and convenience in describing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application.

[0036] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electric oil transfer pump, comprising a pump body (1), an oil inlet distribution plate (2), a cavity plate (3), an oil outlet distribution plate (4), an oil pump rotor (5) and an armature (6), wherein the pump body (1) has a pump cavity (11), an oil outlet (12) and an oil inlet (13) are provided on the pump body (1), the oil inlet distribution plate (2), the cavity plate (3) and the oil outlet distribution plate (4) are sequentially arranged between the oil outlet (12) and the oil inlet (13) along the axial direction of the pump body (1), the oil inlet distribution plate (2) is arranged close to the oil inlet (13), the cavity plate (3) is provided with a rotor accommodating hole (31), the oil pump rotor (5) is arranged in the rotor accommodating hole (31), the armature (6) is rotatably arranged between the oil outlet distribution plate (4) and the oil outlet (12), and is characterized in that: The electric oil pump further comprises a support member (8) and a rotating connection member (9), wherein the oil inlet distribution plate (2) is provided with a receiving groove (21) on one side facing the cavity plate (3), and the support member (8) and the rotating connection member (9) are respectively arranged in the receiving groove (21), and one end of the rotating shaft (61) of the armature (6) sequentially passes through the oil outlet distribution plate (4) and the oil pump rotor (5) to the receiving groove (21) and abuts against the support member (8), and the rotating shaft (61) of the armature (6) and the receiving groove (21) are rotatably connected via the rotating connection member (9), and the armature (6) can be driven to rotate, thereby driving the oil pump rotor (5) to rotate. The rotating connecting member (9) is a bearing or a fixed sleeve, the outer ring of the bearing is fixedly connected to the accommodating groove (21), and the inner ring of the bearing is sleeved on the rotating shaft (61) of the armature (6). It also includes a magnetic tile (17), a brush (18) and a connecting wire (19), wherein the magnetic tile (17) is arranged around the armature (6), the brush (18) is connected to the commutator of the armature (6), and the connecting wire (19) is electrically connected to the brush (18).

2. The electric oil pump according to claim 1, characterized in that: The support member (8) is a metal ball.

3. The electric oil pump according to claim 1, characterized in that: A filter element (10) is further provided between the oil inlet flow channel of the oil inlet distribution plate (2) and the oil inlet port (13).

4. The electric oil pump according to claim 1, characterized in that: An oil outlet joint (121) is also provided at the oil outlet (12).

5. The electric oil pump according to claim 1, characterized in that: The pump body (1) comprises a main body (14) and a cover body (15); a mounting opening is provided on the main body (14); a sealing cover of the cover body (15) is provided on the mounting opening; the pump chamber (11) is formed between the cover body (15) and the main body (14); and the oil outlet (12) is provided on the cover body (15).

6. The electric oil pump according to claim 1, characterized in that: It also includes a positioning member (16), the positioning member (16) is arranged in the pump cavity (11), the other end of the armature (6) rotating shaft (61) is rotatably connected to the positioning member (16), and the positioning member (16) is provided with an overflow port.

7. The electric oil pump according to claim 1, characterized in that: It also includes a bracket (20), wherein the bracket (20) is fixedly connected to the pump body (1).

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