JP6083708B2 - Electric oil pump - Google Patents

Description

  The present invention relates to an electric oil pump that discharges oil.

Conventionally, an electric oil pump has been used to control a hydraulic drive device driven according to oil pressure and to supply lubricating oil for lubricating a mechanism device and the like. In addition, there is a main oil pump (mechanical), and an auxiliary pump (electric) is employed as a hydraulic pressure supply source during idle stop and EV travel. When such an electric oil pump is applied to a vehicle, from the viewpoint of space saving, light weight, and cost reduction, even if it is necessary to supply hydraulic pressure to multiple locations, the lubricating oil is supplied by one electric oil pump. (For example, Patent Document 1).

  In the variable displacement pump described in Patent Document 1, oil discharged from the discharge side opening is once circulated into a pump discharge side pressure chamber formed outside the pump body. The downstream side of the pump discharge side pressure chamber communicates with a pump discharge side passage provided in the pump body. Accordingly, the oil discharged from the discharge-side opening of the variable displacement pump is configured to once flow from the pump body to the outside and return to the pump body again. The oil returned to the pump discharge side passage is branched into a flow path supplied to the power steering device via the metering orifice and a flow path supplied to the tank via the spool type switching valve.

JP-A-7-243385

In the technique described in Patent Literature 1, oil discharged from the discharge side opening is circulated to a pump discharge side pressure chamber provided outside the pump body. For this reason, from the viewpoint of space saving and weight reduction, although the oil is supplied by one electric oil pump, a plurality of oil passages are provided, so that the outer size becomes large. For this reason, the freedom degree of arrangement | positioning becomes small and a layout is restrict | limited. Also, the mass increases.

  In view of the above problems, an object of the present invention is to provide an electric oil pump that can realize space saving and weight reduction.

In order to achieve the above object, the characteristic configuration of the electric oil pump according to the present invention includes a rotor driven and rotated by a motor, a pump chamber in which the rotor is accommodated, and the pump chamber according to the rotation of the rotor. A suction port for sucking oil, a discharge port for discharging the oil from the pump chamber according to the rotation of the rotor, and a first communication hole provided in the discharge port and are discharged from the discharge port. A first discharge passage through which oil flows and a cross-sectional area is reduced from the discharge port; and a second communication hole provided separately from the first communication hole in the discharge port; and the discharge port a pump body and a second discharge passage which discharged oil is a cross-sectional area is reduced from the discharge port flows are formed from pressure of the oil discharged from the discharge port A first check valve that opens and closes by the pressure is provided in the first discharge path, and a second check valve that opens and closes by the pressure of oil discharged from the discharge port is provided in the second discharge path, and the second discharge valve The path is that an orifice for distributing the flow rate to the first discharge path and the flow rate to the second discharge path is provided on the downstream side of the second check valve .

With such a characteristic configuration, the first discharge path and the second discharge path are provided separately from the discharge port in the pump body, so that the first discharge path and the second discharge path are connected to each other. There is no need to provide piping up to the connection with the piping outside the pump body. Therefore, since it can be configured compactly, an electric oil pump that is space-saving and lightweight can be realized. In addition, since the first discharge path and the second discharge path are provided separately from the discharge port in the pump body, they do not interfere with devices around the electric oil pump. Therefore, the freedom degree of the place which arrange | positions an electric oil pump and the freedom degree of arrangement | positioning of a 1st discharge path and a 2nd discharge path can be improved. Further, with such a configuration, the first discharge path and the second discharge path are not branched in the pump body, and the first according to the direction in which the oil supply destination by the electric oil pump is provided. Each of the discharge path and the second discharge path can be arranged. For this reason, since the 1st discharge path and the 2nd discharge path can be constituted by the shortest path according to the direction of a supply destination, it can make it easy to process. Therefore, the manufacturing cost can be reduced. Further, with such a configuration, even when the pressure downstream of the first discharge path and the second discharge path is higher than the pressure of the first discharge path and the second discharge path, the downstream Oil can be prevented from flowing into the electric oil pump from the side. Therefore, even when the operation of the electric oil pump is stopped, the oil does not flow from the outside, so that the electric oil pump can be protected. In addition, since the check valve is provided in each discharge passage, the entire hydraulic system having the electric oil pump can be configured in a compact manner. Therefore, it is possible to improve the degree of freedom of arrangement and the like. Furthermore, with such a configuration, the orifice can be provided in the pump body, so that the hydraulic system having the electric oil pump can be configured in a compact manner. Therefore, it is possible to improve the degree of freedom of arrangement and the like.

The characteristic configuration of the electric oil pump includes: a rotor driven and rotated by a motor; a pump chamber in which the rotor is accommodated; a suction port that sucks oil into the pump chamber according to the rotation of the rotor; A discharge port that discharges the oil from the pump chamber according to rotation and a first communication hole provided in the discharge port, and the oil discharged from the discharge port circulates and has a cross-sectional area from the discharge port. The first discharge path is reduced, and the discharge port communicates with the second communication hole provided separately from the first communication hole in the discharge port, and the oil discharged from the discharge port flows and the discharge port first check valve further comprises a pump body and a second discharge path is formed in which the cross-sectional area is reduced, opened and closed by the pressure of the oil discharged from the discharge port Provided in the first discharge passage, a second check valve for opening and closing by the pressure of the oil discharged from the discharge port is provided in said second discharge passage, the first check valve is formed in the pump body A cylindrical outer oil passage is formed between the outer peripheral surface of the body portion of the fixing screw and the inner peripheral surface of the first discharge passage. In addition, an inner oil passage communicating with the outer oil passage is formed on the radially inner side of the trunk portion through a communicating portion formed in the trunk portion.

With such a characteristic configuration, the first discharge path and the second discharge path are provided separately from the discharge port in the pump body, so that the first discharge path and the second discharge path are connected to each other. There is no need to provide piping up to the connection with the piping outside the pump body. Therefore, since it can be configured compactly, an electric oil pump that is space-saving and lightweight can be realized. In addition, since the first discharge path and the second discharge path are provided separately from the discharge port in the pump body, they do not interfere with devices around the electric oil pump. Therefore, the freedom degree of the place which arrange | positions an electric oil pump and the freedom degree of arrangement | positioning of a 1st discharge path and a 2nd discharge path can be improved. Further, with such a configuration, the first discharge path and the second discharge path are not branched in the pump body, and the first according to the direction in which the oil supply destination by the electric oil pump is provided. Each of the discharge path and the second discharge path can be arranged. For this reason, since the 1st discharge path and the 2nd discharge path can be constituted by the shortest path according to the direction of a supply destination, it can make it easy to process. Therefore, the manufacturing cost can be reduced. Further, with such a configuration, even when the pressure downstream of the first discharge path and the second discharge path is higher than the pressure of the first discharge path and the second discharge path, the downstream Oil can be prevented from flowing into the electric oil pump from the side. Therefore, even when the operation of the electric oil pump is stopped, the oil does not flow from the outside, so that the electric oil pump can be protected. In addition, since the check valve is provided in each discharge passage, the entire hydraulic system having the electric oil pump can be configured in a compact manner. Therefore, it is possible to improve the degree of freedom of arrangement and the like. Furthermore, if it is set as such a structure, since the fixing screw which fixes a 1st check valve can be utilized for an oil path, an electric oil pump can be comprised compactly. Therefore, it is possible to improve the degree of freedom of arrangement and the like.

In addition, it is preferable that the first discharge path and the second discharge path extend to a joint surface with the oil supply destination in the pump body.

With such a configuration, the oil discharged from the discharge port flows through the first discharge path and the second discharge path, and the hydraulic pressure can be directly supplied to a plurality of locations.

  The first check valve is fixed by a fixing screw that enters the first discharge passage from an opening formed in the pump body, and an outer peripheral surface of a body portion of the fixing screw and an inner portion of the first discharge passage. A cylindrical outer oil passage is formed between the outer peripheral oil passage and the inner oil passage communicating with the outer oil passage through a communicating portion formed in the trunk portion on the radially inner side of the trunk portion. It is preferable.

  With such a configuration, since the fixing screw for fixing the first check valve can be used for the oil passage, the electric oil pump can be configured compactly. Therefore, it is possible to improve the degree of freedom of arrangement and the like.

It is the figure which showed typically the structure of the hydraulic system which has an electric oil pump. It is the figure which showed the electric oil pump typically. It is the figure which showed typically the 2nd check valve which concerns on other embodiment. It is the figure which showed typically the 2nd check valve which concerns on other embodiment.

  The electric oil pump according to the present invention is configured to be capable of supplying hydraulic pressure to a hydraulic drive device driven by hydraulic pressure and supplying lubricating oil to mechanical components. Hereinafter, the electric oil pump 1 of the present embodiment will be described. In the present embodiment, an example in which the electric oil pump 1 is provided in, for example, an automatic transmission mounted on a hybrid vehicle will be described. FIG. 1 is a diagram schematically showing a configuration of a hydraulic system 100 in which an electric oil pump 1 provided in such a vehicle is incorporated.

  As shown in FIG. 1, a hydraulic system 100 includes an electric oil pump 1, an engine 2, a gear unit 3, a mechanical oil pump 4, an oil pan 5, a forward clutch 6, a hydraulic circuit 8, and a check valve 9. Is done. The engine 2 is a power source of the vehicle and outputs rotational power by burning fuel such as gasoline. The rotational power of the engine 2 is transmitted to the automatic transmission A. The drive motor M is a power source during EV travel, and outputs rotational power using, for example, electric power stored in a battery. The rotational power of the drive motor M is transmitted to the tire 7.

  The gear unit 3 is configured to have a plurality of gear stages having different gear ratios, and the gear stage is automatically changed according to the traveling state of the vehicle (for example, the traveling speed of the vehicle and the degree of depression of the accelerator). The rotational power of the engine 2 is transmitted to the gear stage via the torque converter and the forward clutch 6, and the gear stage is changed. The output of the gear unit 3 is transmitted to the tire 7 provided at the front portion of the vehicle among the tires 7 of the vehicle via the output shaft 3A.

  The mechanical oil pump 4 is rotationally driven by the rotational power of the engine 2 and supplies oil stored in the oil pan 5 to the gear unit 3 as lubricating oil via the discharge path 4A. Further, the engagement hydraulic pressure is supplied to the other forward clutch 6 (a clutch coupled when the vehicle starts) through the discharge passage 4B. With such a configuration, oil can be supplied to the gear unit 3 and the forward clutch 6 during operation of the engine 2.

  On the other hand, the vehicle on which the hydraulic system 100 is mounted as described above can run on EV. For this reason, when the vehicle is stopped by a signal or the like, or when the necessary drive can be supplied by the drive motor M, the operation of the engine 2 is stopped and the mechanical oil pump 4 is also stopped. Accordingly, the supply of oil to the gear unit 3 and the forward clutch 6 is also stopped. As a result, the supply of hydraulic pressure to the forward clutch 6 is also stopped, so that the forward clutch 6 is completely separated. If the vehicle resumes running in such a state, it is necessary to supply hydraulic pressure to the forward clutch 6 after the engine 2 resumes operation and rotates the mechanical oil pump 4. In such a case, since the forward clutch 6 is completely separated, it takes time until the forward clutch 6 is engaged, and there is a possibility that the shock at the time of engagement becomes so large that the engagement is suddenly increased.

  Therefore, the electric oil pump 1 according to the present invention shortens the time until the forward clutch 6 is engaged when the idling stop is released, and at the time of idling stop so that the shock at the time of engagement does not increase. Oil is supplementarily supplied to the forward clutch 6 while the engine 2 is stopped, and the forward clutch 6 is held in an engaged state. Further, oil as lubricating oil is supplied to the gear unit 3 during electric travel. Hereinafter, the electric oil pump 1 will be described with reference to the drawings.

  FIG. 2 is a diagram schematically showing the electric oil pump 1. Here, the electric oil pump 1 which concerns on this embodiment is comprised from a well-known trochoid pump. Therefore, below, the electric oil pump 1 is demonstrated as a trochoid pump. As shown in FIG. 2, the electric oil pump 1 according to this embodiment includes a rotor 10 and a pump body 20.

  The rotor 10 is driven and rotated by a motor. The motor is rotated by the electric energy supplied from the battery while the engine 2 is idling stopped, and the rotational power output from the motor is input to the rotor shaft 11 provided at the central portion in the radial direction of the rotor 10. The rotor 10 is driven to rotate as the rotor shaft 11 rotates. A plurality of external teeth 10 </ b> A are provided on the outer circumferential surface of the rotor 10, and the rotor 10 rotates about the axis of the rotor shaft 11. The external teeth 10A of the rotor 10 are configured in a tooth surface shape according to a trochoid curve, a cycloid curve, or the like.

  An outer rotor 12 is provided on the radially outer side of the rotor 10. The outer rotor 12 is formed in an annular shape having a plurality of internal teeth 12 </ b> A that mesh with the external teeth 10 </ b> A of the rotor 10, and rotates at a rotational center that is eccentric with respect to the rotational center of the rotor 10. The inner teeth 12 </ b> A of the outer rotor 12 are configured to have one more tooth than the outer teeth 10 </ b> A of the rotor 10, and have a tooth surface shape that contacts the outer teeth 10 </ b> A of the rotor 10 when the outer rotor 12 rotates. Molded. Therefore, a predetermined space is formed inside the outer rotor 12 in the radial direction, and the rotor 10 is accommodated in the space. In the present embodiment, the space corresponds to the pump chamber 30 according to the present invention. Such a pump chamber 30 is formed in the pump body 20. Further, by accommodating the rotor 10 in the pump chamber 30, a predetermined gap Q is formed between the external teeth 10A and the internal teeth 12A.

  In addition, a suction port 40 and a discharge port 50 are formed in the pump body 20. The suction port 40 is an opening formed in the wall portion 20 </ b> A of the pump body 20. Specifically, the suction port 40 is provided on the wall portion 20 </ b> A facing the axial end surface of the outer rotor 12 in the inner wall of the pump body 20, and is provided along the radial direction of the outer rotor 12. From such a suction port 40, oil is sucked into the pump chamber 30 according to the rotation of the rotor 10. As described above, the above-described predetermined gap Q is formed between the outer teeth 10 </ b> A and the inner teeth 12 </ b> A, and oil is sucked into the gap Q according to the rotation of the rotor 10.

  A suction passage 41 through which oil from the oil pan 5 circulates communicates with the suction port 40. In the present embodiment, such a suction passage 41 is also formed in the pump body 20.

  Similarly to the suction port 40, the discharge port 50 also includes an opening formed in the wall portion 20 </ b> A of the pump body 20. Specifically, the discharge port 50 is provided in the wall portion 20 </ b> A facing the axial end surface of the outer rotor 12 in the inner wall of the pump body 20, and is provided along the radial direction of the outer rotor 12. In the present embodiment, the discharge port 50 is provided on the wall portion 20A on the side where the suction port 40 is provided. That is, the suction port 40 and the discharge port 50 are provided on the wall portion 20A facing the same direction. Further, the opening that constitutes the discharge port 50 is provided along the radial direction of the outer rotor 12, apart from the opening that constitutes the suction port 40. From such a discharge port 50, oil is discharged from the pump chamber 30 according to the rotation of the rotor 10. That is, from the discharge port 50, the oil sucked from the suction port 40 is discharged from a predetermined gap Q formed between the external teeth 10A and the internal teeth 12A.

  Oil discharged from the discharge port 50 flows through the first discharge path 60. Here, the discharge port 50 is formed with a first communication hole 52 formed of an opening hole. The first discharge path 60 communicates with the discharge port 50 through the first communication hole 52. Such a first discharge path 60 is formed in the pump body 20. Oil flowing through the first discharge path 60 is supplied to the forward clutch 6 described above. Specifically, it is circulated to the forward clutch 6 via the discharge path 61 and the discharge path 4B (see FIG. 1) outside the pump body 20. Such a first discharge path 60 is configured with a cross-sectional area smaller than that of the discharge port 50.

  The oil discharged from the discharge port 50 flows through the second discharge path 70. Further, the discharge port 50 is formed with a second communication hole 54 formed of an opening hole. The second discharge path 70 communicates with the discharge port 50 through the second communication hole 54. Such a second discharge path 70 is also formed in the pump body 20. Oil flowing through the second discharge passage 70 is supplied to the gear unit 3 as lubricating oil. Specifically, it is distributed to the gear unit 3 via the discharge path 71 and the discharge path 4A (see FIG. 1) outside the pump body 20. Such a second discharge path 70 is configured with a cross-sectional area smaller than that of the discharge port 50.

  In the present embodiment, the discharge port 50 is provided with the first communication hole 52 and the second communication hole 54 separately. Providing separately means a state where the first communication hole 52 and the second communication hole 54 are not used together. Therefore, it means that the first discharge path 60 and the second discharge path 70 are not branched downstream from the discharge port 50, but are directly branched from the discharge port 50.

  In this manner, by forming the first communication hole 52 and the second communication hole 54 separately in the pump body, the first discharge path 60 and the discharge path 61 corresponding to the positions where the discharge path 61 and the discharge path 71 are provided. The second discharge path 70 can be configured with the shortest path. Therefore, the pump body 20 can be easily processed, and the manufacturing cost can be reduced.

  Further, the first discharge path 60 and the second discharge path 70 are provided to extend to the joint surface with the oil supply destination in the pump body 20. The oil supply destination is the forward clutch 6 and the gear unit 3 in the present embodiment. The joint surfaces in the pump body 20 correspond to such joint surfaces 150 and 151 with the gear unit 3 and the forward clutch 6. Therefore, the first discharge path 60 and the second discharge path 70 are provided to extend to the joint surfaces 150 and 151 included in the pump body 20.

  Here, as described above, the electric oil pump 1 is used to supply oil to the gear unit 3 and the forward clutch 6 when the mechanical oil pump 4 is stopped. For this reason, during the operation of the mechanical oil pump 4, since sufficient oil is supplied from the mechanical oil pump 4 to the gear unit 3 and the forward clutch 6, the operation of the electric oil pump 1 is stopped. As shown in FIGS. 1 and 2, a first discharge path 60 of the electric oil pump 1 is provided in communication with a discharge path 4 </ b> C of the mechanical oil pump 4 via a discharge path 61, and downstream of the hydraulic circuit 8. A second discharge path 70 of the electric oil pump 1 is provided in communication with the provided discharge path 4 </ b> A via a discharge path 71. Therefore, the first discharge valve 60 is provided with the first check valve 65 so that the oil discharged from the mechanical oil pump 4 does not flow into the electric oil pump 1 while the operation of the electric oil pump 1 is stopped. A second check valve 75 is provided in the discharge path 70.

  The first check valve 65 is opened and closed by the pressure of oil discharged from the discharge port 50. The first check valve 65 according to this embodiment includes a spring 66, an iron ball 67, and a cage 68. The cage 68 is formed of a cylindrical member having a groove or an opening in the axial direction, and is disposed so as to surround the spring 66 and the iron ball 67. When the pressure of the oil discharged from the discharge port 50 is larger than the urging force of the spring 66, a gap is formed between the iron ball 67 and the cylindrical member 99, and the first check valve 65 is opened. . On the other hand, when the pressure of the oil discharged from the discharge port 50 is smaller than the biasing force of the spring 66, no gap is formed between the iron ball 67 and the cylindrical member 99, and the first check valve 65 is closed. It becomes a valve state. Therefore, it is possible to prevent the oil discharged from the mechanical oil pump 4 from flowing while the electric oil pump 1 is stopped.

  In the present embodiment, the first check valve 65 provided in the first discharge path 60 is fixed at the tip end portion of the fixing screw 90 that enters the first discharge path 60 from the opening hole 23 formed in the pump body 20. The The axial center of the opening hole 23 is at least a part of the first discharge path 60 (the portion of the first discharge path 60 on the upstream side of the opening hole 23 “the first discharge path upstream portion 69”). It is preferable to provide them orthogonally, and it is preferable that they are orthogonally arranged in the vicinity of the body 91 of the fixing screw 90 that has entered the opening hole 23. In the present embodiment, the first check valve 65 is fixed by a fixing screw 90 via a cylindrical member 99 made of cylindrical iron.

  In the present embodiment, the first discharge path 60 (first discharge path upstream portion 69) merges perpendicularly to the opening hole 23 as described above. The fixing screw 90 supports and fixes the first check valve 65 via the cylindrical member 99. The outer oil passage 93 and the inner oil passage 95 are formed in the opening hole 23 so that the oil flowing from the first discharge path 60 (first discharge path upstream portion 69) to the opening hole 23 flows to the first check valve 65 side. It is formed.

  The outer oil passage 93 is formed in a cylindrical shape between the outer peripheral surface 91 </ b> A of the trunk portion 91 of the fixing screw 90 and the inner peripheral surface 60 </ b> A of the first discharge passage 60. The outer peripheral surface 91 </ b> A of the body 91 of the fixing screw 90 is the surface of the entry portion of the fixing screw 90 that enters the opening hole 23. The inner peripheral surface 60 </ b> A of the first discharge path 60 is an inner peripheral surface of the first discharge path 60 that merges with the opening hole 23. The outer diameter of the body portion 91 of the fixing screw 90 is formed smaller than the inner diameter of the first discharge path 60 into which the fixing screw 90 enters. Therefore, at least a cylindrical gap is provided between the outer peripheral surface 91A and the inner peripheral surface 60A. Such a cylindrical gap corresponds to the outer oil passage 93. The oil discharged from the discharge port 50 first flows into the outer oil passage 93.

  The inner oil passage 95 communicates with the outer oil passage 93 via a communication portion 97 formed in the trunk portion 91 on the radially inner side of the trunk portion 91. The communicating part 97 is a part that communicates the inner oil passage 95 and the outer oil passage 93. In the present embodiment, a through-hole penetrating the body portion 91 in the radial direction corresponds. In particular, in the present embodiment, as shown in FIG. 2, communication portions 97 are formed so as to face each other along the radial direction, and such communication portions 97 are formed by changing their positions in the axial direction. The As a result, the oil that has flowed into the outer oil passage 93 flows into the inner oil passage 95 and can flow into the first check valve 65. Thereby, since the fixing screw 90 for fixing the first check valve 65 can be used for the oil passage, the electric oil pump 1 can be configured more compactly than in the case where a separate oil passage is provided.

  The second check valve 75 is opened and closed by the pressure of oil discharged from the discharge port 50. The second check valve 75 according to this embodiment includes a spring 76, an iron ball 77, a cage 78, and a bush 79. The cage 78 is formed of a cylindrical member having a groove or an opening in the axial direction, and is disposed so as to surround the spring 76 and the iron ball 77. The bush 79 is made of iron. When the pressure of the oil discharged from the discharge port 50 is larger than the urging force of the spring 76, a gap is formed between the iron ball 77 and the bush 79, and the second check valve 75 is opened. On the other hand, when the pressure of the oil discharged from the discharge port 50 is smaller than the urging force of the spring 76, no gap is formed between the iron ball 77 and the bush 79, and the second check valve 75 is closed. It becomes a state. Therefore, it is possible to prevent the oil discharged from the mechanical oil pump 4 from flowing into the electric oil pump 1 while the electric oil pump 1 is stopped.

  In the present embodiment, the second discharge path 70 is provided with an orifice 80 that distributes the flow rate to the first discharge path 60 and the flow rate to the second discharge path 70 on the downstream side of the second check valve 75. Here, the oil flowing through the second discharge passage 70 is used as lubricating oil. Accordingly, the opening area of the orifice 80 is set according to the amount of lubricating oil required for the gear unit 3 to which the lubricating oil is supplied and the required hydraulic pressure of the forward clutch 6. With such a configuration, it is not necessary to provide the orifice 80 outside the pump body 20, so that the hydraulic system 100 including the electric oil pump 1 can be configured in a compact manner.

  The orifice 80 is formed in a unit shape having a predetermined thickness T in the oil flow direction. This unit is press-fitted from the outside of the pump body 20 to the second check valve 75 side. In such a case, it is preferable that, for example, part of the predetermined thickness T of the unit protrudes from the pump body 20 and is press-fitted. By press-fitting in this way, it is possible to perform positioning when the pump body 20 is assembled with the remaining protruding portion (for example, a half of the thickness T).

  As mentioned above, according to this invention, since the 1st discharge path 60 and the 2nd discharge path 70 can be provided in the pump body 20, the discharge to which each of the 1st discharge path 60 and the 2nd discharge path 70 is connected. The piping to the path 61 and the discharge path 71 can be configured in a compact manner. Accordingly, it is possible to realize the electric oil pump 1 that is space-saving and lightened. In addition, since the first discharge path 60 and the second discharge path 70 are provided in the pump body 20, there is no interference with devices around the electric oil pump 1. Therefore, the freedom degree of the place which arrange | positions the electric oil pump 1 and the freedom degree of arrangement | positioning of the 1st discharge path 60 and the 2nd discharge path 70 can be improved.

[Other Embodiments]
In the above embodiment, the electric oil pump 1 has been described as being configured from a trochoid pump. However, the scope of application of the present invention is not limited to this. Of course, it is possible to use a pump other than the trochoid pump as long as it is rotationally driven by electric energy.

  In the above embodiment, the first check valve 65 is provided in the first discharge path 60, and the second check valve 75 is provided in the second discharge path 70. However, the scope of application of the present invention is not limited to this. Of course, the first discharge valve 60 is not provided with the first check valve 65, and the second discharge passage 70 is not provided with the second check valve 75. In such a case, it is preferable to provide each check valve outside the pump body 20. Further, it is naturally possible to provide a configuration in which a check valve is provided only in one of the first discharge path 60 and the second discharge path 70 and a check valve is provided outside the pump body 20 in the other.

  In the above embodiment, the orifice 80 has been described as being press-fitted into the pump body 20. However, the scope of application of the present invention is not limited to this. For example, as shown in FIG. 3, it is also possible to employ a configuration that is fastened with screws. In this case, in order to prevent the cage 78 made of a resin member from being deformed or the like due to overtightening of the screw fastening, a flange portion 80a having a seating surface that comes into contact with the pump body 20 is provided in the unit of the orifice 80. Is preferred. As a result, it is possible to prevent the cage 78 from being deformed.

  In the above embodiment, the second discharge path 70 has been described as being provided with the orifice 80 on the downstream side of the second check valve 75. However, the scope of application of the present invention is not limited to this. Of course, it is possible to configure without the orifice 80 on the downstream side of the second check valve 75.

  Further, as shown in FIG. 4, the orifice 80 can be provided on the bush 79 side. Even in such a case, the amount of oil can be adjusted appropriately, and the fitting portion 78a can be formed in the cage 78, and the cage 78 can be snap-fitted to the pump body 20, thereby reducing the number of parts.

  In the above embodiment, the first check valve 65 has been described as being fixed by the fixing screw 90. However, the scope of application of the present invention is not limited to this. The first check valve 65 is naturally possible in other forms.

  Further, it has been described that the outer oil passage 93 and the inner oil passage 95 are formed in the vicinity of the fixing screw 90. However, the scope of application of the present invention is not limited to this. For example, it is possible to configure without providing both the outer oil passage 93 and the inner oil passage 95 by joining the first discharge passage 60 in the vicinity of the cylindrical member 99. It is also possible to provide only one of the outer oil passage 93 and the inner oil passage 95.

  Further, in the above-described embodiment, it has been described that it is preferable that the axis of the opening hole 23 is provided orthogonal to at least a part of the first discharge path 60. However, the scope of application of the present invention is not limited to this. Of course, it is also possible to provide the opening 23 so that the axis of the opening hole 23 is not orthogonal to the first discharge path 60.

  In the above embodiment, the first check valve 65 has been described as being fixed via the cylindrical member 99 by the fixing screw 90. However, the scope of application of the present invention is not limited to this. Of course, it is possible to fix the first check valve 65 with the fixing screw 90 without using the cylindrical member 99.

  In the above-described embodiment, the communication portion 97 is a portion that connects the inner oil passage 95 and the outer oil passage 93, and has been described as corresponding to a through hole that penetrates the body portion 91 of the fixing screw 90 in the radial direction. However, the scope of application of the present invention is not limited to this. That is, the communication part 97 can naturally be constituted by a groove instead of a through hole.

  Further, in the above-described embodiment, it has been described that the communication portions 97 are formed so as to face each other along the radial direction, and are formed by changing the position of each other in the axial direction of the fixing screw 90. However, the scope of application of the present invention is not limited to this. It is possible to provide only one communicating portion 97 on the fixing screw 90, and of course, when a plurality of communicating portions 97 are provided, they may be provided so as not to face each other. Further, it is naturally possible to provide the positions of the fixing screws 90 so as to coincide with each other with respect to the axial direction.

  In the above embodiment, the first check valve 65 is fixed by the fixing screw 90 and the orifice 80 is provided on the downstream side of the second check valve 75. However, the scope of application of the present invention is not limited to this. Of course, it is also possible to provide the orifice 80 on the downstream side of the first check valve 65 so that the second check valve 75 is fixed by the fixing screw 90.

  The present invention can be used in an electric oil pump that discharges oil, and can be used as a power supply unit, a shock absorber unit, and the like in addition to a gear unit as an oil supply destination.

1: Electric oil pump 10: Rotor 20: Pump body 23: Opening hole 30: Pump chamber 40: Suction port 50: Discharge port 52: First communication hole 54: Second communication hole 60: First discharge path 60A: Inner circumference Surface 65: First check valve 70: Second discharge passage 75: Second check valve 80: Orifice 90: Fixing screw 91: Body 91A: Outer peripheral surface 93: Outer oil passage 95: Inner oil passage 97: Communication portion

Claims (4)

A rotor driven and rotated by a motor; and
A pump chamber in which the rotor is housed, a suction port for sucking oil into the pump chamber according to rotation of the rotor, a discharge port for discharging the oil from the pump chamber according to rotation of the rotor, A first discharge passage that communicates with a first communication hole provided in the discharge port, and through which oil discharged from the discharge port flows and whose cross-sectional area is reduced from the discharge port, and the first communication path to the discharge port A pump body that communicates with a second communication hole provided separately from the hole, and that has a second discharge passage through which oil discharged from the discharge port flows and whose cross-sectional area is reduced from the discharge port equipped with a,
A first check valve that opens and closes by the pressure of oil discharged from the discharge port is provided in the first discharge path, and a second check valve that opens and closes by the pressure of oil discharged from the discharge port is provided in the second discharge path. It is provided in
The electric oil pump , wherein the second discharge path is provided with an orifice that distributes a flow rate to the first discharge path and a flow rate to the second discharge path on the downstream side of the second check valve . A rotor driven and rotated by a motor; and
A pump chamber in which the rotor is housed, a suction port for sucking oil into the pump chamber according to rotation of the rotor, a discharge port for discharging the oil from the pump chamber according to rotation of the rotor, A first discharge passage that communicates with a first communication hole provided in the discharge port, and through which oil discharged from the discharge port flows and whose cross-sectional area is reduced from the discharge port, and the first communication path to the discharge port A pump body that communicates with a second communication hole provided separately from the hole, and that has a second discharge passage through which oil discharged from the discharge port flows and whose cross-sectional area is reduced from the discharge port With
A first check valve that opens and closes by the pressure of oil discharged from the discharge port is provided in the first discharge path, and a second check valve that opens and closes by the pressure of oil discharged from the discharge port is provided in the second discharge path. It is provided in
The first check valve is fixed by a fixing screw that enters the first discharge passage from an opening formed in the pump body,
A cylindrical outer oil passage is formed between the outer peripheral surface of the barrel portion of the fixing screw and the inner peripheral surface of the first discharge passage, and a communication portion formed in the barrel portion on the radially inner side of the barrel portion. An electric oil pump in which an inner oil passage communicating with the outer oil passage is formed . The first check valve is fixed by a fixing screw that enters the first discharge passage from an opening formed in the pump body,
A cylindrical outer oil passage is formed between the outer peripheral surface of the barrel portion of the fixing screw and the inner peripheral surface of the first discharge passage, and a communication portion formed in the barrel portion on the radially inner side of the barrel portion. The electric oil pump according to claim 1 , wherein an inner oil passage communicating with the outer oil passage is formed. The electric oil pump according to any one of claims 1 to 3, wherein the first discharge path and the second discharge path extend to a joint surface of the pump body with the oil supply destination.

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