JP6160195B2 - Electric pump device - Google Patents

Description

  The present invention relates to an electric pump device.

  2. Description of the Related Art Conventionally, as an electric pump device that generates hydraulic pressure by driving a pump with a motor, there is one in which a motor and a pump are housed and integrated in a common housing. Such an electric pump device is mounted on a vehicle having a so-called idle stop function that automatically stops the engine when the vehicle is temporarily stopped, for example, and ensures supply of hydraulic pressure to the transmission or the like at the time of idle stop.

  Further, in such an electric pump device, a pump chamber in which the pump in the housing is accommodated and a motor chamber in which the motor is accommodated are communicated via a communication hole, and hydraulic oil is supplied to the pump chamber via the motor chamber. There are ones (for example, Patent Document 1) and those in which the pump chamber and the motor chamber are partitioned in an airtight manner and hydraulic oil is directly supplied to the pump chamber (for example, Patent Document 2). And in the former electric pump device, there exists an advantage that a motor can be cooled with hydraulic oil.

Japanese Patent Laid-Open No. 5-122901 JP 2010-112330 A

  By the way, in the electric pump device of the type in which hydraulic oil flows through the motor chamber, the relative vertical position of the communication hole in the motor chamber (vertical upper end position in the communication hole) and the motor chamber and pump chamber of the communication hole The characteristic of the electric pump device changes according to the opening area. Specifically, the amount of hydraulic oil stored in the motor chamber, that is, the ratio of hydraulic oil to air in the motor chamber, changes in accordance with the vertical upper end position of the communication hole in the motor chamber. As the oil ratio increases, the cooling performance of the motor increases, but the stirring resistance when the rotor of the motor rotates also increases, so that the load torque necessary to rotate the rotor increases. Further, when the flow rate of the pump changes according to the opening area of the communication hole and the flow rate increases, the discharge pressure of the electric pump device increases.

  Here, according to the use of the electric pump device and the surrounding environment where the electric pump device is installed, the upper end position and the opening area of the communication hole in the motor chamber in the vertical direction are set so that the characteristics of the electric pump device are optimized. However, Patent Document 1 discloses nothing about changing these. Therefore, in order to manufacture the electric pump device having different characteristics, a plurality of types of housings having different shapes are required, and there is a problem that, for example, the manufacturing cost increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electric pump device capable of easily adjusting characteristics.

An electric pump device that solves the above-described problems includes a pump that generates hydraulic pressure, a motor that drives the pump, and a housing that integrally accommodates the pump and the motor, and the housing includes an interior of the housing. A partition wall section is provided that divides the pump chamber in which the pump is housed and a motor chamber in which the motor is housed, and the partition wall section is provided with a communication hole that communicates the pump chamber and the motor chamber. The hydraulic oil is sucked into the pump chamber from the suction flow path opened in the motor chamber through the motor chamber and the communication hole, and discharged from the discharge flow path opened in the pump chamber. An adjustment hole intersecting the communication hole is formed in the part, and a filling plug is inserted into the adjustment hole, and the filling plug is inserted into the communication hole in the communication hole. It is formed to be cut off the flow of hydraulic oil in the range Rutotomoni, and summarized in that comprising a first stuffed stopper position can be changed independently in the adjustment hole and the second packed plug.
An electric pump device that solves the above-described problems includes a pump that generates hydraulic pressure, a motor that drives the pump, and a housing that integrally accommodates the pump and the motor, and the housing includes an interior of the housing. A partition wall section is provided that divides the pump chamber in which the pump is housed and a motor chamber in which the motor is housed, and the partition wall section is provided with a communication hole that communicates the pump chamber and the motor chamber. The hydraulic oil is sucked into the pump chamber from the suction flow path opened in the motor chamber through the motor chamber and the communication hole, and discharged from the discharge flow path opened in the pump chamber. An adjustment hole intersecting the communication hole is formed in the part, and a filling plug is inserted into the adjustment hole, and the filling plug is inserted into the communication hole in the communication hole. It blocked movable around a flow of the hydraulic oil in the range, the adjustment hole, and summarized in that only one end of the adjusting hole is formed so as to open to the outside.

According to the above configuration, by changing the position of the filling plug in the adjustment hole, at least one of the upper end position in the vertical direction and the opening area in the range in which the hydraulic oil can flow in the communication hole can be changed. Therefore, the characteristics of the electric pump device can be easily adjusted by changing the position of the plug in the adjustment hole without preparing a plurality of types of housings having different shapes.
In the electric pump device, according to the configuration in which the plug includes a first plug and a second plug whose positions in the adjustment hole can be independently changed, only one plug is provided in the adjustment hole. Compared with the case of insertion, the vertical upper end position and the opening area of the range in which the hydraulic oil can flow in the communication hole can be changed widely, so that the characteristics of the electric pump device can be finely adjusted.
In the electric pump device, the adjustment hole may be formed so that only one end side of the adjustment hole is opened to the outside, and both end sides of the adjustment hole are opened to the outside. Compared to the above, it is possible to suppress leakage of hydraulic oil to the outside.
In the electric pump device, it is preferable that the first and second plugs are each formed in a shaft shape.
According to the said structure, compared with the case where the shape of a 1st plug is different from the shape of a 2nd plug, for example, reduction of manufacturing cost can be aimed at.

In the electric pump device, it is preferable that a screw groove is formed on the inner periphery of the adjustment hole and a screw thread is formed on the outer periphery of the filling plug.
According to the said structure, the position in the adjustment hole of this filling plug can be changed easily by rotating (screwing forward and backward).

In the electric pump device, it is preferable that the plug is made of the same material as the partition wall.
According to the above configuration, since the thermal expansion coefficients of the partition wall and the plug are substantially equal to each other, for example, even if the temperature of the electric pump device is increased by operating the motor for a long time, the adjustment hole and the plug are It is possible to suppress the formation of a gap between the two.

  According to the present invention, the characteristics can be easily adjusted.

Sectional drawing along the axial direction of the electric pump apparatus which set the oil ratio of 1st Embodiment small. (A) is a cross-sectional view orthogonal to the axial direction of the electric pump device in which the oil ratio of the first embodiment is set small (A-A cross-sectional view in FIG. 1), and (b) is a cross-sectional view along BB in (a). . Sectional drawing orthogonal to the axial direction of the electric pump apparatus which set the oil ratio of 1st Embodiment large. Sectional drawing along the axial direction of the electric pump apparatus which set the oil ratio of 1st Embodiment large. Sectional drawing orthogonal to the axial direction of the electric pump apparatus which set the oil ratio of 2nd Embodiment small. Sectional drawing orthogonal to the axial direction of the electric pump apparatus which set the oil ratio of 2nd Embodiment large. (A)-(c) is a fragmentary sectional view orthogonal to the axial direction of the electric pump apparatus of another example.

(First embodiment)
Hereinafter, 1st Embodiment of an electric pump apparatus is described according to drawing.
An electric pump device 1 shown in FIG. 1 is mounted on, for example, a vehicle having an idle stop function, and is used to ensure hydraulic pressure supply to a transmission or the like at the time of idle stop. As shown in the figure, the electric pump device 1 includes a housing 2 formed in a cylindrical shape. In the housing 2, a pump 3 that generates hydraulic pressure, a motor 4 that drives the pump 3, and a control board 5 as a control device that controls the operation of the motor 4 are integrally accommodated.

  More specifically, the housing 2 has a bottomed cylindrical pump case 11 that is open on one axial end side (right side in FIG. 1) of the electric pump device 1, and a pump that is disposed so as to close the opening of the pump case 11. A plate 12 and a bottomed cylindrical motor case 13 having an opening at one end in the axial direction are provided.

  The pump case 11 is fixed to the opening end of the cylindrical portion 13 a of the motor case 13, and the opening of the cylindrical portion 13 a is closed by the pump plate 12. The motor case 13 is formed with a cylindrical extending portion 13c extending from the bottom portion 13b to the other axial end side (left side in FIG. 1) of the electric pump device 1. A disc-shaped cover 14 is fixed to the opening end of the extending portion 13 c, and the opening of the extending portion 13 c is closed by the cover 14. The inside of the pump case 11 is configured as a pump chamber 15 that houses the pump 3, the inside of the cylindrical portion 13 a of the motor case 13 is configured as a motor chamber 16 that houses the motor 4, and the inside of the extending portion 13 c is inside the control board 5. It is comprised as the control room 17 which accommodates. That is, the pump chamber 15 and the motor chamber 16 are partitioned by the bottom portion 11a of the pump case 11, and the bottom portion 11a corresponds to the partition wall portion. The pump case 11 and the pump plate 12 are made of a metal material such as an aluminum alloy, and the motor case 13 and the cover 14 are made of a resin material.

  A suction passage (suction port) 21 that connects the motor chamber 16 and the outside is formed in the cylindrical portion 13 a of the motor case 13. The suction channel 21 is formed in a straight line and is formed at a position near the pump chamber 15 in the cylindrical portion 13a. A communication hole 23 for communicating the pump chamber 15 and the motor chamber 16 is formed in the bottom 11 a of the pump case 11. The communication hole 23 is formed so that a gap between an outer gear 31 and an inner gear 32 of the pump 3 to be described later is opposed to a range in which the gap increases with the rotation of the motor 4 in the axial direction. The pump plate 12 is formed with a discharge flow path (discharge port) 24 that communicates the pump chamber 15 with the outside. The discharge passage 24 is formed in a straight line, and the opening on the pump chamber 15 side of the discharge passage 24 is such that a gap formed between the outer gear 31 and the inner gear 32 becomes smaller as the motor 4 rotates. It is formed so as to face the range in the axial direction. The control chamber 17 is partitioned in a state (liquid-tight) in which the hydraulic oil O does not enter from the motor chamber 16 by the bottom 13b of the motor case 13.

  On the outer peripheral edge of the pump plate 12 and the opening end of the cylindrical portion 13a of the motor case 13, flange portions 12a and 13d projecting radially outward are formed at positions facing each other in the axial direction. The electric pump device 1 is attached to the bracket 26 by screwing a fastening bolt 25 to a bracket 26 as an attachment target fixed to the vehicle main body (not shown) via the flange portions 12a and 13d. ing. The pump plate 12 and the motor case 13 and the pump plate 12 and the bracket 26 are sealed by seal members 27a and 27b such as O-rings.

  As the pump 3, a trochoid pump (internal gear pump) is employed. Specifically, the pump 3 includes an outer gear 31 having teeth on the inner periphery and an inner gear 32 having teeth on the outer periphery. And the outer gear 31 is arrange | positioned rotatably in the pump chamber 15, and the inner gear 32 is arrange | positioned in the inner periphery of the outer gear 31 in the state which a part of tooth | gear part meshed | engaged.

  The motor 4 is a brushless motor. Specifically, the motor 4 includes a stator 41 that is fixed in the motor chamber 16 and a rotor 42 that is rotatably disposed on the inner periphery of the stator 41. The stator 41 is formed by winding a coil 44 around teeth of a stator core 43 formed in an annular shape. The connection end 44 a of the coil 44 is drawn into the control chamber 17 and connected to the control board 5. The stator 41 is provided integrally with the motor case 13 by insert molding, and a part of the stator 41 is embedded in the cylindrical portion 13 a of the motor case 13.

  On the other hand, the rotor 42 includes a rotor core 46 fixed to the rotating shaft 45 and a plurality of permanent magnets 47 fixed to the outer periphery of the rotor core 46. The rotary shaft 45 is rotatably supported by bearings 48 a and 48 b provided on the bottom 11 a of the pump case 11 and the bottom 13 b of the motor case 13, and one end thereof (the right end in FIG. 1) is inside the pump chamber 15. Protruding. An inner gear 32 of the pump 3 is connected to one end of the rotating shaft 45 so as to be integrally rotatable.

  In the electric pump device 1 configured as described above, when the driving power is supplied from the control board 5 to the motor 4 and the rotor 42 rotates in one direction, the inner gear 32 rotates and the pump 3 is driven. As a result, the hydraulic oil O is sucked into the motor chamber 16 from the oil reservoir (not shown) via the suction passage 21 and further sucked into the pump chamber 15 via the communication hole 23. Then, the hydraulic oil O is discharged from the pump chamber 15 to the transmission or the like via the discharge passage 24. As described above, in the electric pump device 1, the hydraulic oil O is sucked into the pump chamber 15 via the motor chamber 16, so that the motor 4 and the control board 5 are cooled by the hydraulic oil O.

Next, a structure for adjusting (changing) the characteristics of the electric pump device will be described.
As described above, the electric pump device 1 is characterized by the relative vertical position of the communication hole 23 in the motor chamber 16 (vertical upper end position of the communication hole 23), the pump chamber 15 of the communication hole 23, and the motor chamber. 16 varies depending on the opening area. Specifically, the oil ratio, which is the ratio of the hydraulic oil O to the air in the motor chamber 16, changes according to the vertical upper end position of the range in which the hydraulic oil O can flow through the communication hole 23, and The flow rate (discharge pressure) of the pump 3 changes according to the opening area of the range in which the hydraulic oil O can flow. Therefore, an appropriate opening area is set for the flow rate and discharge pressure of the pump 3.

  In view of this point, as shown in FIGS. 2A and 2B, an adjustment hole 51 orthogonal to the communication hole 23 is formed in the bottom 11a of the pump case 11 functioning as a partition wall, and the adjustment hole 51 is inserted with first and second plugs 52 and 53 whose positions in the adjustment hole 51 can be changed independently. And the 1st and 2nd filling plugs 52 and 53 are formed so that the distribution | circulation of the hydraulic oil O in the range in which the 1st and 2nd filling plugs 52 and 53 in the communicating hole 23 were inserted is interrupted | blocked.

  Specifically, the communication hole 23 extends in the axial direction of the electric pump device 1 and penetrates in the same direction. The cross section perpendicular to the axial direction of the electric pump device 1 of the communication hole 23 is formed in a rectangular shape, and the rectangular longitudinal direction formed by the cross section of the electric pump device 1 with the bracket 26 attached is the vertical direction. It is formed so that it may become substantially parallel.

  The adjustment hole 51 extends in a vertical direction perpendicular to the axial direction of the electric pump device 1, and one end side (the lower side in FIG. 2) opens to the outer periphery of the pump case 11 and does not interfere with the bearing 48 a. The case 11 is formed at a position shifted from the center of the bottom 11a. The inner diameter of the adjustment hole 51 is smaller than the length along the axial direction of the communication hole 23 and larger than the width along the short direction of the rectangle formed by the cross section of the communication hole 23. A screw groove 54 is formed on the inner periphery of the adjustment hole 51. Note that an insertion hole 55 penetrating into the cylindrical portion 13 a of the motor case 13 is formed at a position facing the adjustment hole 51. Thereby, one end side of the adjustment hole 51 is opened to the outside of the housing 2 through the insertion hole 55.

  The first and second plugs 52 and 53 are made of the same material as the pump case 11 (metal material such as an aluminum alloy), and are each formed in a shaft shape (bar shape). The first plug 52 is inserted on the bottom side of the adjustment hole 51, and the second plug 53 is inserted on the opening side of the adjustment hole 51. Further, on the outer circumferences of the first and second plugs 52 and 53, screw threads 56 and 57 that are screwed into the screw grooves 54 of the adjustment hole 51 are formed, respectively. The first and second plugs 52 and 53 are inserted into the adjustment hole 51 by being screwed into (inserted into) the adjustment hole 51. Here, since the inner diameter of the adjustment hole 51 is formed larger than the width of the communication hole 23 as described above, the range in which the first and second plugs 52 and 53 in the communication hole 23 are screwed is The hydraulic oil O is blocked by the first and second plugs 52 and 53 so that the flow of the hydraulic oil O is blocked.

  In addition, the cross-shaped groove | channel etc. in which tools, such as a driver, are inserted are formed in the end surface of the 1st and 2nd filling plugs 52 and 53. As shown in FIG. In the present embodiment, a sealing agent such as silicon resin is injected from the external opening of the adjustment hole 51, so that a minute gap between the adjustment hole 51 and the first and second plugs 52 and 53 is formed. Buried.

Next, the manufacture (action) of the electric pump device having different characteristics will be described.
When manufacturing the electric pump device 1 with a small oil ratio, for example, a first plug 52 having a long axial length (axial length) as shown in FIG. Thus, the range from the upper end in the vertical direction to the vicinity of the lower end of the communication hole 23 is closed. Thereby, the vertical direction upper end position of the range which can distribute | circulate the hydraulic oil O in the communicating hole 23 becomes low, and as shown in FIG. 1, the electric pump apparatus 1 with a small oil ratio can be manufactured. In addition, by changing the position in the adjustment hole 51 of the 1st filling plug 52, the slightly different electric pump apparatus 1 can be manufactured in the range with a small oil ratio. Moreover, since the opening area of the range which can distribute | circulate the hydraulic oil O in the communicating hole 23 changes by changing the position in the adjustment hole 51 of the 2nd plug 53 from the state shown in FIG. The electric pump device 1 having a different discharge pressure of the pump 3 can be manufactured while keeping small.

  On the other hand, when manufacturing the electric pump device 1 having a large oil ratio, for example, a first plug 52 having a short shaft length as shown in FIG. 3 is inserted into the adjustment hole 51, and the communication hole 23 is formed by the first plug 52. The range up to the vicinity of the upper end in the vertical direction is closed. Thereby, the vertical direction upper end position of the range which can distribute | circulate the hydraulic oil O in the communicating hole 23 becomes high, and as shown in FIG. 4, the electric pump apparatus 1 with a large oil ratio can be manufactured. In addition, by changing the position in the adjustment hole 51 of the 1st plug 52, the slightly different electric pump apparatus 1 can be manufactured in the range with a large oil ratio. Moreover, since the opening area of the range which can distribute | circulate the hydraulic oil O in the communicating hole 23 changes by changing the position in the adjustment hole 51 of the 2nd plug 53 from the state shown in FIG. The electric pump device 1 with different discharge pressures of the pump 3 can be manufactured while keeping large.

Next, the effect of this embodiment will be described.
(1) By changing the positions of the first and second plugs 52 and 53 in the adjustment hole 51, the vertical upper end position and the opening area in the range in which the hydraulic oil can flow in the communication hole 23 are adjusted. I made it. Therefore, it is easy to change the position of the first and second plugs 52 and 53 in the adjustment hole 51 without preparing multiple types of housings for manufacturing an electric pump with different characteristics. The characteristics of the pump device 1 can be adjusted. In addition, since the first and second plugs 52 and 53 whose positions in the adjustment hole 51 can be independently changed are inserted in the adjustment hole 51, one plug is inserted in the adjustment hole 51. Compared with the case where it inserts only, the vertical direction upper end position and opening area of the range which can distribute | circulate the hydraulic fluid in the communicating hole 23 can be changed widely, and the characteristic of the electric pump apparatus 1 can be adjusted finely.

  (2) Since the screw groove 54 is formed on the inner periphery of the adjustment hole 51 and the screw threads 56 and 57 that are screwed into the screw groove 54 are formed on the outer periphery of the first and second plugs 52 and 53, respectively. By rotating (screwing forward and backward) the second plugs 52 and 53, the positions of the first and second plugs 52 and 53 in the adjustment hole 51 can be easily changed.

(3) Since the first and second plugs 52 and 53 are each formed in the shape of a shaft, the manufacturing cost of the electric pump device 1 can be reduced as compared with the case where they are formed in different shapes.
(4) Since the adjustment hole 51 is formed so that only one end side thereof opens to the outside of the housing 2, the hydraulic oil O is exposed to the outside of the housing 2 compared to the case where both end sides of the adjustment hole 51 open to the outside of the housing 2. Leakage can be suppressed.

  (5) Since the first and second plugs 52 and 53 are made of the same material as the bottom 11a of the pump case 11, the thermal expansion coefficients of the bottom 11a and the first and second plugs 52 and 53 are equal to each other. Thereby, for example, even if the temperature of the electric pump device 1 is increased by operating the motor 4 for a long time, a gap is generated between the adjustment hole 51 and the first and second filling plugs 52 and 53. Can be suppressed.

(Second Embodiment)
Next, 2nd Embodiment of an electric pump apparatus is described according to drawing. The main difference between this embodiment and the first embodiment is only the configuration of the first and second plugs. For this reason, for convenience of explanation, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  As shown in FIG. 5, the first plug 61 is formed in a bottomed cylindrical shape. A screw thread 62 is formed on the outer periphery of the first plug 61 so as to be screwed into the screw groove 54 of the adjustment hole 51, and a screw groove 63 is formed on the inner periphery of the cylindrical portion 61 a of the first plug 61. Is formed. The axial length of the cylindrical portion 61 a of the first plug 61 is positioned below the lower end in the vertical direction of the communication hole 23 in a state where the bottom 61 b of the first plug 61 is in contact with the bottom surface of the adjustment hole 51. Is formed. Further, the inner diameter of the cylindrical portion 61 a is formed to be larger than the width along the short direction of the rectangle formed by the cross section of the communication hole 23. And the through-hole 64 penetrated in the direction (axial direction of the electric pump apparatus 1) orthogonal to the axial direction is formed in the cylindrical part 61a, The inside of the cylindrical part 61a is penetrated through this through-hole 64. The pump chamber 15 and the motor chamber 16 communicate with each other. In addition, the cross section orthogonal to the axial direction of the electric pump device 1 of the through hole 64 is formed in a rectangular shape having substantially the same width as the communication hole 23. The first plug 61 is inserted into a predetermined position in the adjustment hole 51 by being screwed into the adjustment hole 51. Thereby, the range in which the bottom 61b of the first plug 61 in the communication hole 23 is inserted is closed by the bottom 61b, and the flow of the hydraulic oil O is blocked.

  The second plug 65 is formed in a shaft shape, and on the outer periphery of the second plug 65, a thread 66 that is screwed with the screw groove 63 of the first plug 61 is formed. The second filling plug 65 is inserted into a predetermined position in the adjustment hole 51 by being screwed into the cylindrical portion 61 a of the first filling plug 61. Thereby, the range in which the second plug 65 in the through hole 64 is inserted, that is, the range in which the second plug 65 is inserted in the communication hole 23 is blocked by the second plug 65, and the hydraulic oil O flows. Is to be blocked.

Next, adjustment of the characteristics of the electric pump device 1 of the present embodiment will be described.
When manufacturing the electric pump device 1 with a small oil ratio, for example, a first plug 61 having a long shaft 61b as shown in FIG. 5 is inserted into the adjustment hole 51, and the bottom 61b of the first plug 61 is inserted. Thus, the range from the upper end in the vertical direction to the vicinity of the lower end of the communication hole 23 is closed. Thereby, the vertical direction upper end position of the range which can distribute | circulate the hydraulic oil O in the communicating hole 23 becomes low, and the electric pump apparatus 1 with a small oil ratio can be manufactured (refer FIG. 1). Further, by changing the range of the through hole 64 closed by the second plug 65, that is, the communication hole 23 from the state shown in FIG. Since it changes, the electric pump apparatus 1 from which the discharge pressure of the pump 3 differs can be manufactured, keeping an oil ratio small. In addition, by changing the position in the adjustment hole 51 of the 1st filling plug 61, the slightly different electric pump apparatus 1 can be manufactured in the range with a small oil ratio.

  On the other hand, when manufacturing the electric pump device 1 having a large oil ratio, for example, a first plug 61 having a short shaft 61b as shown in FIG. The range up to the vicinity of the upper end in the vertical direction of the communication hole 23 is closed by the bottom 61b. Thereby, the vertical direction upper end position of the range which can distribute | circulate the hydraulic oil O in the communicating hole 23 becomes high, and the electric pump apparatus 1 with a large oil ratio can be manufactured (refer FIG. 4). Further, by changing the range of the communication hole 23 closed by the second plug 65 from the state shown in FIG. 6, the opening area of the range in which the hydraulic oil O can flow in the communication hole 23 changes, and the pump 3 Therefore, it is possible to manufacture the electric pump device 1 having a different discharge pressure of the pump 3 while keeping the oil ratio large. In addition, by changing the position in the adjustment hole 51 of the 1st filling plug 61, the slightly different electric pump apparatus 1 can be manufactured in the range with a large oil ratio.

As described above, according to this embodiment, the same effects as (1), (2), (4), and (5) of the first embodiment can be obtained.
In addition, each said embodiment can also be implemented in the following aspects which changed this suitably.

In the first embodiment, the first and second plugs 52 and 53 are inserted into the adjustment hole 51. However, the present invention is not limited to this, and only one plug may be inserted into the adjustment hole 51.
In the example shown in FIG. 7A, the filling plug 71 is formed in a shaft shape, and a thread 72 that is screwed into the screw groove 54 of the adjustment hole 51 is formed on the outer periphery of the filling plug 71. . In this configuration, by changing the position of the plug 71 in the adjustment hole 51, only the opening area of the communication hole 23 in the range where the hydraulic oil O can flow is changed.

  In the example shown in FIG. 7B, the adjustment hole 51 is formed to open upward in the vertical direction. The filling plug 73 is formed in a shaft shape, and a thread 74 that is screwed into the screw groove 54 of the adjustment hole 51 is formed on the outer periphery of the filling plug 73. In this configuration, by changing the position of the filling plug 73 in the adjustment hole 51, the upper end position and the opening area of the range through which the hydraulic oil O can flow in the communication hole 23 change simultaneously.

  In the example shown in FIG. 7C, the filling plug 75 has a pair of plug portions 75a having a thread 76 formed on the outer periphery, and a connecting portion 75b that connects the plug portions 75a. The connecting portion 75b is formed so as not to close the communication hole 23, and the filling plug 75 is formed such that only a part (plug portion 75a) of the hydraulic oil O can be blocked. In this configuration, by changing the position of the plug 75 in the adjustment hole 51, only the upper end position of the range in which the hydraulic oil O can flow in the communication hole 23 can be changed.

  In the first embodiment, the first and second plugs 52 and 53 are inserted by screwing into the adjustment holes 51. However, the present invention is not limited to this, and for example, the first and second plugs 52 and 53 are press-fitted. May be inserted into the adjustment hole 51. Similarly, in the second embodiment, the first plug 61 may be pressed into the adjustment hole 51 and the second plug 65 may be pressed into the cylindrical portion 61 a of the first plug 61. In this case, it is desirable that the pump case 11 and the first and second filling plugs 61 and 65 are made of an iron-based material.

  In each of the above embodiments, the adjustment hole 51 is formed so as to be orthogonal to the communication hole 23 (the axial direction of the electric pump device 1). However, the adjustment hole 51 is not limited to this, and is obliquely crossed with the communication hole 23. It may be formed.

  In each of the above embodiments, the communication hole 23 is formed so that the rectangular longitudinal direction formed by the cross section of the communication hole 23 is oblique to the vertical direction in a state where the electric pump device 1 is attached to the bracket 26. May be. Similarly, the adjustment hole 51 may be formed so that the extending direction of the adjustment hole 51 is oblique to the vertical direction.

In each of the above embodiments, the first plugs 52 and 61 and the second plugs 53 and 65 may be made of a material different from that of the pump case 11.
In each of the above embodiments, the adjustment hole 51 is formed so that only one end side opens on the outer periphery of the pump case 11, but both end sides of the adjustment hole 51 may be formed on the outer periphery of the pump case 11. .

  In each of the above embodiments, the insertion hole 55 may not be formed in the cylindrical portion 13a of the motor case 13, and the opening of the adjustment hole 51 may be blocked by the cylindrical portion 13a. In this case, after inserting the first plugs 52 and 61 and the second plugs 53 and 65 into the adjustment hole 51 of the pump case 11, the pump case 11 is connected to the cylindrical portion 13 a of the motor case 13. It will be fixed to.

In each of the above embodiments, the control board 5 may be disposed outside the housing 2 without being integrally housed in the housing 2.
In each of the above embodiments, another pump such as a vane pump may be employed for the pump 3, and another motor other than the brushless motor may be employed for the motor 4.

  In each of the above embodiments, the hydraulic pressure is supplied to the transmission by the electric pump device 1, but the present invention is not limited to this. For example, the hydraulic pressure may be supplied to a hydraulic actuator of a hydraulic power steering device.

Next, the technical idea that can be grasped from the above embodiments and other examples will be described below.
(A) The first plug is formed in a bottomed cylindrical shape, and the cylindrical portion of the first plug is connected to the inside of the cylindrical portion, the motor chamber, and the via the communication hole. An electric pump device characterized in that a through-hole communicating with the pump chamber is formed, and the second plug is formed in a shaft shape inserted into a cylindrical portion of the first plug.

  DESCRIPTION OF SYMBOLS 1 ... Electric pump apparatus, 2 ... Housing, 3 ... Pump, 4 ... Motor, 11 pump case, 11a ... Bottom part (partition wall part), 12 ... Pump plate, 13 ... Motor case, 15 ... Pump chamber, 16 ... Motor chamber, 21 ... Suction channel, 22 ... Working oil, 23 ... Communication hole, 24 ... Discharge channel, 51 ... Adjustment hole, 52,61 ... First plug, 53,65 ... Second plug, 54,63 ... Screw Groove, 56, 57, 62, 66, 72, 74, 76 ... thread, 71, 73, 75 ... filling plug.

Claims (5)

A pump that generates hydraulic pressure, a motor that drives the pump, and a housing that integrally accommodates the pump and the motor,
The housing is provided with a partition wall that divides the housing into a pump chamber in which the pump is accommodated and a motor chamber in which the motor is accommodated. The partition wall includes the pump chamber and the motor chamber. A communication hole is provided to communicate with the
In the electric pump device, the hydraulic oil is sucked into the pump chamber through the motor chamber and the communication hole from the suction flow path opened in the motor chamber, and discharged from the discharge flow path opened in the pump chamber.
The partition wall is formed with an adjustment hole that intersects the communication hole, and a plug is inserted into the adjustment hole.
The filling plug, the communication hole該詰Me plug is blocked movable around a flow of the hydraulic fluid to the extent that has been inserted in Rutotomoni, a first packed stopper position can be changed independently in the adjustment hole An electric pump device comprising a second plug . A pump that generates hydraulic pressure, a motor that drives the pump, and a housing that integrally accommodates the pump and the motor,
  The housing is provided with a partition wall that divides the housing into a pump chamber in which the pump is accommodated and a motor chamber in which the motor is accommodated. The partition wall includes the pump chamber and the motor chamber. A communication hole is provided to communicate with the
  In the electric pump device, the hydraulic oil is sucked into the pump chamber through the motor chamber and the communication hole from the suction flow path opened in the motor chamber, and discharged from the discharge flow path opened in the pump chamber.
  The partition wall is formed with an adjustment hole that intersects the communication hole, and a plug is inserted into the adjustment hole.
  The plug is formed so as to be able to block the flow of hydraulic oil in a range where the plug is inserted in the communication hole,
  The electric pump device, wherein the adjustment hole is formed so that only one end side of the adjustment hole opens to the outside. The electric pump device according to claim 1 ,
The electric pump device characterized in that the first and second plugs are each formed in a shaft shape. In the electric pump device according to any one of claims 1 to 3 ,
An electric pump device, wherein a screw groove is formed on an inner periphery of the adjustment hole, and a screw thread is formed on an outer periphery of the filling plug. In the electric pump device according to any one of claims 1 to 4 ,
The electric pump device, wherein the filling plug is made of the same material as the partition wall.