CN113632366A - Inverter unit and motor unit - Google Patents

Abstract

An inverter unit according to an aspect of the present invention includes a case, a circuit board housed in the case, a wiring section connecting the circuit board and an external power supply device, and a cover member attached to the case so as to cover an opening. The housing has an opening portion that opens at one side in the first direction, a bottom surface that is positioned at the other side in the first direction and is orthogonal to the first direction, and an opening end surface that is an end surface that surrounds the outer periphery of the opening portion. At least a portion of the open end face is inclined with respect to the bottom face.

Description

Inverter unit and motor unit

Technical Field

The present invention relates to an inverter unit and a motor unit.

The present application claims priority based on Japanese patent application No. 2019-067976, filed on Japanese application on 3/29/2019, and the contents of which are incorporated herein by reference.

Background

An inverter unit is known which includes an inverter for controlling a motor and a case housing the inverter. Patent document 1 describes an electric drive unit (inverter unit) in which components are stacked and fixed in the order of size in consideration of compactness, assembly, manufacturability, vibration resistance, and the like. Further, there is described an electric drive device unit (inverter unit) covered at an upper portion of a frame with a cover member having a hat shape, i.e., a shape having a maximum outer shape at a fitting surface portion with the frame, and having a shape in which the upper portion is gradually narrowed.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2003-199363

Disclosure of Invention

Technical problem to be solved by the invention

However, in the case where the cover member of the electric drive device unit (inverter unit) of patent document 1 is in the cap shape, although the case where the drive device is in the forward tilting posture is considered, the case where the drive device is not in the forward tilting posture is not considered, and in the case where the drive device cannot be arranged in the forward tilting posture, if the arrangement space of the electric drive device unit (inverter unit) becomes narrow, there is a technical problem that the electric drive device unit (inverter unit) cannot be arranged.

In view of the above, it is an object of the present invention to provide an inverter unit and a motor unit that can be easily installed in a narrow storage space.

Technical scheme for solving technical problem

One aspect of the inverter unit according to the present invention is an inverter unit that converts direct current into alternating current and supplies the alternating current to a motor. The inverter unit includes: a housing having an opening portion that opens at one side in a first direction and a bottom surface that is located at the other side in the first direction and is orthogonal to the first direction; a circuit board housed in the case; a wiring section that connects the circuit board and an external power supply device; and a cover member attached to the housing so as to cover the opening, the housing having an opening end surface that is an end surface surrounding an outer periphery of the opening, at least a part of the opening end surface being inclined with respect to the bottom surface.

One aspect of the motor unit of the present invention includes, for example, the inverter unit and a motor to which an ac current is supplied from the inverter unit.

Effects of the invention

According to one aspect of the present invention, for example, an inverter unit and a motor unit that can be easily installed in a narrow storage space are provided.

Drawings

Fig. 1 is a plan view of an inverter unit according to a first embodiment.

Fig. 2 is a schematic cross-sectional view of the inverter unit of the first embodiment taken along line ii-ii of fig. 1.

Fig. 3 is a plan view of the inverter unit according to the first embodiment in which the first cover member and the second cover member are omitted.

Fig. 4 is a bottom view of the housing of the first embodiment.

Fig. 5 is a perspective view of an inverter unit of the second embodiment.

Fig. 6 is an exploded perspective view of the inverter unit of the second embodiment.

Fig. 7 is a plan view of the inverter unit of the second embodiment.

Fig. 8 is a cross-sectional view as viewed along arrows on the line iv-iv of fig. 7.

Fig. 9 is a sectional view of fig. 8 with the cover member omitted.

Fig. 10 is a schematic diagram illustrating an effect of the inverter unit according to the second embodiment.

Detailed Description

An inverter unit according to an embodiment of the present invention will be described below with reference to the drawings. In the following drawings, for convenience of understanding of the respective structures, scales, numbers, and the like of the respective structures may be different from those of actual structures.

In the following description, the direction of gravity is defined based on the positional relationship in the case where the inverter unit is mounted on a vehicle on a horizontal road surface, and the description is given. In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional rectangular coordinate system. In the XYZ coordinate system, the Z-axis direction represents the vertical direction (i.e., the vertical direction), the + side in the Z-axis direction is the upper side (the opposite side to the direction of gravity), and the-side in the Z-axis direction is the lower side (the direction of gravity). The upper side in the vertical direction is one side in the first direction, and the lower side in the vertical direction is the other side in the first direction. The X-axis direction is a direction orthogonal to the Z-axis direction and indicates the front-rear direction of the vehicle on which the inverter unit is mounted. The + side in the X-axis direction is the front side in the front-rear direction, and the-side in the X-axis direction is the rear side in the front-rear direction. The Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and indicates a width direction (left-right direction) of the vehicle. The + side in the Y-axis direction is the left side in the left-right direction, and the-side in the Y-axis direction is the right side in the left-right direction. The left-right direction is a second direction orthogonal to the first direction.

[ first embodiment ]

The inverter unit 1 and the motor unit 3 including the inverter unit 1 according to the first embodiment will be described in detail below with reference to the drawings.

Fig. 1 is a plan view of the inverter unit 1. The inverter unit 1 is included in the motor unit 3. The motor unit 3 includes an inverter unit 1, a motor 2, and a motor housing 3 a. The motor unit 3 may include a reduction gear (not shown) for reducing the rotation speed of the motor 2.

The motor unit 3 of the present embodiment is mounted on a vehicle having a motor as a power source, such as a Hybrid Electric Vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an Electric Vehicle (EV), and is used as the power source.

A housing space for housing the motor 2 is provided inside the motor housing 3 a. The motor 2 is housed in a housing space of the motor case 3 a. The inverter unit 1 is fixed to the outer peripheral surface of the motor case 3 a.

The ac current is supplied from the inverter unit 1 to the motor 2. The motor 2 is controlled by the inverter unit 1. The motor 2 includes a rotor 2a that rotates about a motor axis J extending in a horizontal direction, and a stator 2b that is located radially outward of the rotor 2 a. The coil lines of the stator 2b are connected to the inverter unit 1.

Fig. 2 is a schematic sectional view of the inverter unit 1 taken along line ii-ii of fig. 1. Fig. 3 is a plan view of the inverter unit 1 with the first cover member 40 and the second cover member 50 omitted.

The inverter unit 1 converts a direct current into an alternating current and supplies the alternating current to the motor 2. As shown in fig. 2, the inverter unit 1 includes a case 10, a control substrate 21, a power substrate (circuit substrate) 22, a capacitor 23, an Insulated Gate Bipolar Transistor (hereinafter, referred to as IGBT)24, a first bus bar 31, a second bus bar 32, a bus bar holder 33, a cover member opening detection device 60, a first cover member 40, and a second cover member 50.

A housing space 13 is provided inside the housing 10. In the housing space 13, the control board 21, the power board 22, the capacitor 23, the IGBT24, the first bus bar 31, the second bus bar 32, the bus bar holder 33, and the cover member opening detection device 60 are housed.

The housing space 13 is divided into a first housing chamber 11 and a second housing chamber 12. That is, the housing 10 is provided with a first housing chamber 11 and a second housing chamber 12. The first housing chamber 11 and the second housing chamber 12 are open to the outside. The openings of the first storage chamber 11 and the second storage chamber 12 face upward. That is, the first housing chamber 11 and the second housing chamber 12 open in the same direction. The opening directions of the first housing chamber 11 and the second housing chamber 12 coincide with the vertical direction. The first housing chamber 11 and the second housing chamber 12 are adjacent to each other. The housing 10 has a first opening 14 that opens above the first storage chamber 11, and a second opening 15 that opens above the second storage chamber 12.

The control board 21, the power board 22, the capacitor 23, and the IGBT24 are housed in the first housing chamber 11. The first bus bar 31 is housed so as to straddle the first housing chamber 11 and the second housing chamber 12. The second bus bar 32, the bus bar holder 33, and the cover member opening detection device 60 are housed in the second housing chamber 12.

The case 10 has a first bottom wall 10a, a second bottom wall 10b, a side wall 10c, and a partition wall 10 d. The housing space 13 is a space surrounded by the first bottom wall 10a, the second bottom wall 10b, and the side wall 10 c.

The side wall portion 10c has a substantially rectangular ring shape when viewed in the vertical direction. The side wall portion 10 encloses the housing space 13 from the horizontal direction. The side wall portion 10c has a first opening end surface 10ca1 and a second opening end surface 10ca2 as upper end surfaces. The first opening end surface 10ca1 is an end surface that surrounds the outer periphery of the first opening 14. The second opening end surface 10ca2 is an end surface that surrounds the outer periphery of the second opening 15. The first opening end surface 10ca1 and the second opening end surface 10ca2 are each a surface parallel to the left-right direction, that is, a surface parallel to the XY plane. The first lid member 40 is fixed to the first opening end surface 10ca1, and the second lid member 50 is fixed to the second opening end surface 10ca 2.

The first bottom wall 10a and the second bottom wall 10b are located at the lower end of the side wall 10 c. The first bottom wall 10a and the second bottom wall 10b are located below the housing space 13. The first bottom wall portion 10a is located below the first accommodation chamber 11. The second bottom wall portion 10b is located below the second accommodation chamber 12. The first bottom wall portion 10a has a face 10a1 facing the upper side. That is, the housing 10 has a bottom surface 10a1 perpendicular to the vertical direction. The first opening end surface 10ca1 and the second opening end surface 10ca2 are parallel to the bottom surface 10a1, respectively.

The second bottom wall portion 10b is located above the first bottom wall portion 10 a. Therefore, the vertical dimension (dimension along the opening direction) of the second housing chamber 12 is smaller than the vertical dimension of the first housing chamber 11. Further, the volume of the second housing chamber 12 is smaller than the volume of the first housing chamber 11. The second housing chamber 12 mainly houses a part of the first bus bar 31 and the second bus bar 32. In the second housing chamber 12, the plate thickness directions of the first bus bar 31 and the second bus bar 32 coincide with the vertical direction. According to the present embodiment, the vertical dimension of the second housing chamber 12 is set smaller than that of the first housing chamber 11, and the entire inverter unit 1 can be downsized.

The partition wall 10d divides the housing space 13 into a first housing chamber 11 and a second housing chamber 12. The partition wall portion 10d is provided with a partition wall opening 10da that communicates the first housing chamber 11 and the second housing chamber 12 with each other. The first bus bar 31 passes through the partition wall opening 10 da. The left half of the upper end surface of the partition wall 10d is a part of the first opening end surface 10ca1, and the right half thereof is a part of the second opening end surface 10ca 2.

Fig. 4 is a bottom view of the housing 10. A plurality of (four in the present embodiment) positioning recesses 19 are provided on the outer peripheral surface of the housing 10. In the present embodiment, two positioning recesses 19 are provided in each of the first bottom wall 10a and the second bottom wall 10 b.

The positioning recesses 19 are open downward, respectively. The positioning recess 19 is circular in plan view. In the assembly process of the inverter unit 1, a positioning pin provided in an assembly device (not shown) is inserted into the positioning recess 19. Thereby, the housing 10 and the assembly device are positioned to each other.

As shown in fig. 2, the control board 21 is located in the first accommodation chamber 11. The control board 21 is connected to the motor 2 to control the motor 2. For example, when the motor unit 3 includes an encoder such as a resolver, the control board 21 performs feedback control of the rotation speed of the motor 2 based on the rotation speed of the motor 2 measured by the encoder.

The power board 22, the capacitor 23, and the IGBT24 are located in the first housing chamber 11. The capacitor 23 and the IGBT24 are connected to the power board 22. The power board 22, the capacitor 23, and the IGBT24 constitute the inverter 25. The inverter 25 is connected to the external power supply device 9 through a first bus bar 31 and a second bus bar 32. The external power supply device 9 is, for example, a rechargeable battery mounted on a vehicle. The inverter 25 converts a direct current supplied from the external power supply device 9 into an alternating current.

As shown in fig. 3, a pair of first bus bars 31 and a pair of second bus bars 32 are provided in the inverter unit 1. The first bus bar 31 and the second bus bar 32 are made of conductive plate materials. The first bus bar 31 and the second bus bar 32 are connected to each other by a fixing screw 30 a. The pair of first bus bars 31 and the pair of second bus bars 32 constitute a wiring section 30. That is, the inverter unit 1 includes the wiring section 30.

The wiring unit 30 is provided so as to straddle the first storage chamber 11 and the second storage chamber 12. The wiring unit 30 connects the power substrate 22 to the external power supply device 9. That is, the wiring unit 30 connects the external power supply device 9 to the inverter 25. The wiring unit 30 is connected to a power cable 9a extending from the external power supply device 9. The wiring unit 30 supplies the dc current supplied from the external power supply device 9 via the power cable 9a to the inverter 25.

According to the present embodiment, the wiring portion 30 is a plate-shaped bus bar. Generally, a bus bar is easier to secure insulation even in the case of vibration than a flexible cable. According to the present embodiment, since the wiring portion 30 is a plate-shaped bus bar, a large current can be stably supplied from the external power supply device 9 to the inverter 25.

The first bus bar 31 spans the first housing chamber 11 and the second housing chamber 12. One end of the first bus bar 31 is positioned in the first accommodation chamber 11 and connected to the power board 22. The other end of the first bus bar 31 is positioned in the second housing chamber 12 and connected to the second bus bar 32.

The second bus bar 32 is located in the second accommodation chamber 12. The plate thickness direction of the second bus bar 32 coincides with the vertical direction over the entire length. That is, the plate thickness direction of the second bus bar 32 coincides with the opening direction of the second storage chamber. The second bus bar 32 extends in a substantially L-shape when viewed in the vertical direction. The second bus bar 32 is supported by a bus bar holder 33. The second bus bar 32 is fixed to the housing 10 by a bus bar holder 33.

One end of the second bus bar 32 is connected to the second bus bar 32. Further, a connection portion 32a connected to the external power supply device 9 is provided at the other end of the second bus bar 32. That is, the wiring unit 30 has a connection portion 32a located in the second storage chamber 12.

At the connecting portion 32a, the plate thickness direction of the second bus bar 32 coincides with the opening direction of the second housing chamber 12. The connection portion 32a is provided with a through hole 32c penetrating in the plate thickness direction of the second bus bar 32. On the other hand, a connection terminal 9b is provided at the tip of a power cable 9a extending from the external power supply device 9. The connection terminal 9b is provided with a through-hole (not shown) overlapping the through-hole 32 c. The fixing screw 30b is inserted and screw-fixed to the through hole 32c of the connecting portion 32a and the through hole of the connection terminal 9 b. Thereby, the wiring section 30 is connected to the external power supply device 9.

According to the present embodiment, the connection portion 32a is screwed to the connection terminal 9b of the external power supply device 9 at the through-hole 32 extending in the opening direction of the second housing chamber 12. Therefore, the worker can screw the connection portion 32a and the connection terminal 9b of the external power supply apparatus 9 from the opening direction of the second housing chamber 12. Therefore, the wiring unit 30 and the external power supply device 9 can be easily connected with the opening of the second housing chamber 12 opened.

The cover member opening detection device 60 is located in the second housing chamber 12. The cover member detection device 60 has a switch portion 61 that contacts the second cover member 50. When the second cover member 50 is removed from the housing 10, the switch portion 61 is separated from the second cover member 50. When the second cover member 50 is detached from the housing 10 and the switch portion 61 is detached from the second cover member 50, the cover member opening detection device 60 blocks the current supplied from the external power supply device 9. Further, if the second cover member 50 is attached to the housing 10 and the switch portion 61 is in contact with the second cover member 50, the cover member opening detection device 60 releases the interruption of the current from the external power supply device 9.

According to the present embodiment, since the cover member opening detection device 60 is provided, it is possible to suppress the current from flowing through the wiring portion 30 in a state where the second housing chamber 12 is opened. Therefore, in the connection step of connecting the connection portion 32 of the wiring portion 30 and the connection terminal 9b of the external power supply device 9, the worker can be protected from the high-voltage current, and the connection step can be performed safely.

In the present embodiment, the case where the cover member opening detection device 60 is disposed inside the second housing chamber 12 is exemplified. However, the cover member opening detection device 60 may be disposed outside the second storage chamber 12 as long as it detects the opening of the second cover member 50.

As shown in fig. 2, the first lid member 40 covers the first opening 14 and is attached to the first opening end surface 10ca1 of the housing 10. The first cover member 40 covers the first accommodation chamber 11 from the upper side. The first cover member 40 is plate-shaped. The first cover member 40 is formed by press working. The plate thickness direction of the first cover member 40 coincides with the opening direction (vertical direction in the present embodiment) of the first storage chamber 11.

The first cover member 40 has an upper surface 40a and a lower surface 40 b. The lower surface 40b constitutes a part of the inner surface of the first accommodation chamber 11. The lower surface 40b is in contact with the first opening end surface 10ca1 of the housing 10. The upper surface 40a is a surface facing the opposite side of the lower surface 40 b. The upper surface 40a is a surface facing the opening direction of the first accommodation chamber 11.

As shown in fig. 1, the first cover member 40 is fixed to the first opening end surface 10ca1 of the housing 10 at the peripheral edge portion by a plurality of fixing screws 18. A plurality of through holes (not shown) penetrating the first cover member 40 in the plate thickness direction are provided in the peripheral edge portion of the first cover member 40. The fixing screw 18 is inserted into a through hole of the first cover member 40 and screwed to the housing 10. Thereby, the first cover member 40 is fixed to the first opening end surface 10ca1 of the housing 10.

A plurality of positioning holes 49 are provided in the peripheral edge portion of the first cover member 40. In the present embodiment, two positioning holes 49 are provided in the first cover member 40. The positioning hole 49 penetrates the first cover member 40 in the plate thickness direction. In the assembling step of the inverter unit 1, a positioning pin provided in an assembling device (not shown) is inserted into the positioning hole 49. Thereby, the first cover member 40 and the assembling device are positioned to each other.

As shown in fig. 2, the second lid member 50 is attached to the second opening end surface 10ca2 of the housing 10 so as to cover the second opening 15. The second cover member 50 is plate-shaped. The second cover member 50 is formed by press working. The second lid member 50 has a lid member main body portion 51, a protruding portion 52, and a pressing portion 53.

The lid member main body 51 has a plate shape whose plate thickness direction coincides with the vertical direction. The thickness direction of the lid member main body 51 coincides with the opening direction (vertical direction in the present embodiment) of the second storage chamber 12. The cover member main body 51 covers the second storage chamber 12 from above.

The cover member main body portion 51 has an upper surface 51a and a lower surface 51 b. The lower surface 51b constitutes a part of the inner surface of the second accommodation chamber 12. The lower surface 51b is in contact with the second opening end surface 10ca2 of the housing 10. The upper surface 51a is a surface facing the opposite side of the lower surface 51 b. The upper surface 51a is a surface facing the opening direction of the second housing chamber 12.

As shown in fig. 1, the lid member main body 51 is fixed to the second opening end surface 10ca2 of the housing 10 at the peripheral edge portion thereof by a plurality of fixing screws 18. A plurality of through holes (not shown) penetrating the lid member main body 51 in the plate thickness direction are provided in the peripheral edge portion of the lid member main body 51. The fixing screw 18 is inserted into a through hole of the cover member main body 51 and screwed to the housing 10. Thereby, the second cover member 50 is fixed to the second opening end surface 10ca2 of the housing 10. As shown in fig. 2, the first cover member 40 and the second cover member 50 are fixed to one continuous surface (upper end surface 10ca) of the housing 10.

As shown in fig. 1, a plurality of positioning holes 59 are provided in the peripheral edge portion of the cover member main body 51. In the present embodiment, two positioning holes 59 are provided in the cover member main body portion 51. The positioning hole 59 penetrates the cover member main body 51 in the plate thickness direction. In the assembling step of the inverter unit 1, a positioning pin provided in an assembling device (not shown) is inserted into the positioning hole 59. Thereby, the second cover member 50 and the assembling device are positioned to each other.

As shown in fig. 2, the protruding portion 52 protrudes from the outer edge of the cover member main body portion 51 to the opposite side (i.e., the upper side) of the housing 10. In the present embodiment, the protruding portion 52 is inclined toward the first cover member 40 side as going upward.

The pressing portion 53 extends from the front end (i.e., the upper end) of the protruding portion 52 toward the first cover member 40. The pressing portion 53 covers at least a part of the upper surface 40a of the first cover member 40.

When performing the connection step of connecting the connection portion 32a of the wiring portion 30 and the connection terminal 9b of the external power supply device 9, the worker opens the second opening 15, which is the opening of the second housing chamber 12. The inverter unit 1 of the present embodiment is provided with a first cover member 40 and a second cover member 50, respectively, the first cover member 40 covering the first opening 14, which is the opening of the first housing chamber 11, and the second cover member 50 covering the second opening 15, which is the opening of the second housing chamber 12. According to the present embodiment, the worker can perform the connecting step in a state where the first opening 14 is closed. Therefore, contamination of the control board 21 and the inverter 25 in the first housing chamber 11 by dust and the like can be suppressed during the connection step.

According to the present embodiment, the pressing portion 53, which is a part of the second cover member 50, covers a part of the upper surface 40a of the first cover member 40. Therefore, in order to remove the first cover member 40, the second cover member 50 needs to be removed first. According to the present embodiment, the first cover member 40 can be prevented from being removed during the connecting step. Therefore, the control board 21 and the inverter 25 in the first housing chamber 11 can be prevented from being contaminated with dust and the like.

According to the present embodiment, the cover member opening detection device 60 detects the opening of the second opening 15, which is the opening of the second housing chamber 12, and blocks the current flowing through the wiring section 30. A part of the second cover member 50 covering the second opening portion 15 covers a part of the first cover member 40. Therefore, when the first opening 14 is opened, the second opening 15 is simultaneously opened. According to the present embodiment, even when the first opening 14 is opened, the worker can be protected from the high-voltage current.

[ second embodiment ]

Next, the configuration of an inverter unit 1A according to a second embodiment of the present invention will be described with reference to fig. 5 to 9. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in fig. 5 to 9, the inverter unit 1A includes a case 10A, a control substrate 21, a power substrate (circuit substrate) 22, a capacitor 23, an IGBT24, a wiring section 30, and a cover member 100. The inverter unit 1A converts a direct current into an alternating current and supplies the alternating current to the motor 2. The inverter unit 1A of the second embodiment is fixed to a motor case 3a of the motor 2, as in the inverter unit 1 of the first embodiment, but illustration of the motor 2, the motor case 3a, and the like is omitted in fig. 5 to 9.

As shown in fig. 6, a housing space 13 is provided inside the case 10A. Control board 21, power board 22, capacitor 23, IGBT24, and wiring unit 30 are housed in housing space 13.

The housing space 13 is divided into a first housing chamber 11 and a second housing chamber 12. That is, the housing 10A is provided with a first housing chamber 11 and a second housing chamber 12. The first housing chamber 11 and the second housing chamber 12 are open on the upper side. The first housing chamber 11 and the second housing chamber 12 are adjacent to each other. The housing 10A has a first opening 14 that opens above the first storage chamber 11, and a second opening 15 that opens above the second storage chamber 12.

As shown in fig. 3, the first opening 14 and the second opening 15 of the first embodiment are separated in the left-right direction. On the other hand, as shown in fig. 6, the first opening 14 and the second opening 15 in the second embodiment are connected in the left-right direction. In other words, the first housing chamber 11 and the second housing chamber 12 in the second embodiment are connected to each other on the upper side of the housing 10A in the left-right direction. In the second embodiment, the first opening portion 14 and the second opening portion 15 connected in the left-right direction are defined as one opening portion 16. That is, the housing 10A in the second embodiment has the opening 16 opened upward in the vertical direction.

As shown in fig. 6, 8, and 9, the control board 21, the power board 22, the capacitor 23, and the IGBT24 are housed in the first housing chamber 11. Similarly to the first embodiment, the wiring unit 30 is housed so as to straddle the first housing chamber 11 and the second housing chamber 12.

The case 10A has a first bottom wall 10A, a second bottom wall 10b, a side wall 10c, and a partition wall 10 d. The housing space 13 is a space surrounded by the first bottom wall 10a, the second bottom wall 10b, and the side wall 10 c.

The first bottom wall 10A and the second bottom wall 10b are located at the lower end of the housing 10A. The first bottom wall portion 10a is located below the first accommodation chamber 11. The second bottom wall portion 10b is located below the second accommodation chamber 12. As shown in fig. 8 and 9, the first bottom wall portion 10a has an upward facing surface 10a 1. That is, the housing 10A has a bottom surface 10A1 located on the lower side in the vertical direction and orthogonal to the vertical direction.

The second bottom wall portion 10b is located above the first bottom wall portion 10 a. Therefore, the vertical dimension (dimension along the opening direction) of the second housing chamber 12 is smaller than the vertical dimension of the first housing chamber 11. Further, the volume of the second housing chamber 12 is smaller than the volume of the first housing chamber 11. According to the present embodiment, the size of the second housing chamber 12 in the vertical direction is made smaller than that of the first housing chamber 11, and the entire inverter unit 1A can be made smaller.

The side wall portion 10c has a substantially rectangular ring shape when viewed in the vertical direction. The side wall portion 10c encloses the housing space 13 from the horizontal direction. The side wall portion 10c has an open end surface 10ca as an upper end surface. The opening end face 10ca is an end face surrounding the outer periphery of the opening 16. That is, the case 10A has an opening end surface 10ca which is an upper end surface surrounding the outer periphery of the opening 16. The lid member 100 is fixed to the opening end surface 10 ca. As described later, in the second embodiment, at least a part of the opening end surface 10ca of the case 10A is inclined with respect to the bottom surface 10A1 of the housing 10A.

As shown in fig. 6, 8, and 9, the side wall portion 10c includes a rear side wall portion 10c1, a front side wall portion 10c2, and a fastening portion 10c 3. The rear side wall portion 10c1 is a portion that is located on the rear side and extends in the left-right direction, of the portions that constitute the side wall portion 10 c. The front side wall portion 10c2 is a portion that is located on the front side and extends in the left-right direction, of the portions that constitute the side wall portion 10 c. The rear side wall portion 10c1 and the front side wall portion 10c2 are opposed to each other in the front-rear direction. The rear side wall portion 10c1 is a component corresponding to the first side wall portion of the present invention, and the front side wall portion 10c2 is a component corresponding to the second side wall portion of the present invention. The fastening portion 10c3 is disposed on the rear side wall portion 10c1 and is fastened to a motor case, not shown, by a fastening member such as a screw. The fastening portions 10c3 are provided in plural in the left-right direction at the upper end of the rear side wall portion 10c1, and protrude from the upper end toward the rear side in the front-rear direction.

As shown in fig. 8 and 9, when viewed from the left-right direction, opening end face 10ca of case 10A is inclined with respect to bottom face 10A1 of case 10A. More specifically, the opening end surface 10ca is inclined downward in the vertical direction as it goes from the rear side wall portion 10c1 toward the front side wall portion 10c2 as viewed in the left-right direction. In other words, the opening end surface 10ca is inclined downward from the rear side toward the front side when viewed in the left-right direction.

Fig. 8 and 9 are views of a vertical cross section (a cross section orthogonal to the left-right direction) of the casing 10A as viewed from the right side, but the open end surface 10ca is also inclined downward as it goes from the rear side to the front side as viewed from the left side of the vertical cross section of the casing 10A. When the longitudinal section of the case 10A is viewed from the right side and from the left side, the inclination angle of the opening end face 10ca with respect to the bottom face 10A1 is the same.

The partition wall 10d divides the housing space 13 into a first housing chamber 11 and a second housing chamber 12. The partition wall portion 10d is provided with a partition wall recess portion 10d1 that allows the first housing chamber 11 and the second housing chamber 12 to communicate with each other in the left-right direction. The first opening 14 and the second opening 15 are connected in the left-right direction by the partition wall recess 10d 1. The wiring portion 30 passes through the partition wall recess 10d 1. The upper end surface of the partition wall 10d is a part of the opening end surface 10 ca.

As shown in fig. 6, 8, and 9, the control board 21 is located in the first accommodation chamber 11. The control board 21 is connected to the motor 2 not shown and controls the motor 2. For example, when the motor unit 3, not shown, includes an encoder such as a resolver, the control board 21 performs feedback control of the rotation speed of the motor 2 based on the rotation speed of the motor 2 measured by the encoder.

As shown in fig. 8 and 9, the power board 22, the capacitor 23, and the IGBT24 are located in the first storage chamber 11. The capacitor 23 and the IGBT24 are connected to the power board 22. The power board 22, the capacitor 23, and the IGBT24 constitute the inverter 25. The inverter 25 is connected to an external power supply device 9, not shown, via a wiring unit 30. The external power supply device 9 is, for example, a rechargeable battery mounted on a vehicle. The inverter 25 converts a direct current supplied from the external power supply device 9 into an alternating current.

As shown in fig. 6, the capacitor 23 has an upper end surface 23a which is a surface facing upward in the vertical direction. As shown in fig. 8 and 9, at least a part of the opening end surface 10ca of the case 10A is located below the upper end surface 23a of the capacitor 23 in the vertical direction. Further, the control board 21 is disposed above the capacitor 23, but at least a part of the opening end surface 10ca of the case 10A is located below the control board 21 in the vertical direction. That is, a part of the capacitor 23 and a part of the control board 21 are exposed above the case 10A.

The wiring unit 30 is provided so as to straddle the first storage chamber 11 and the second storage chamber 12. The wiring unit 30 connects the power substrate 22 to the external power supply device 9. That is, the wiring unit 30 connects the external power supply device 9 to the inverter 25. The wiring unit 30 is connected to a power cable 9a extending from the external power supply device 9. The wiring unit 30 supplies the dc current supplied from the external power supply device 9 via the power cable 9a to the inverter 25.

As shown in fig. 5 to 8, the cover member 100 is attached to the opening end surface 10ca of the housing 10A so as to cover the opening 16. The cover member 100 covers the first housing chamber 11 and the second housing chamber 12 from above. The lid member 100 includes a lid member main body portion 110 and a flange portion 120.

The lid member main body 110 is a portion that covers the opening 16 of the portion constituting the lid member 100. The cover member main body portion 110 extends in the left-right direction. The flange portion 120 is a portion that is provided on the outer peripheral edge of the lid member main body portion 110 and is connected to the opening end surface 10ca, of the portion constituting the lid member 100. The flange portion 120 is expanded in a direction away from the lid member body portion 110 along the outer peripheral edge portion of the lid member body portion 110. The plate thickness direction of the flange portion 120 coincides with the direction orthogonal to the opening end face 10 ca. The lid member body portion 110 has a shape recessed from the flange portion 120 to the upper side in the up-down direction.

The flange portion 120 is in surface contact with the opening end surface 10ca of the housing 10A. The flange portion 120 is fixed to the opening end surface 10ca of the housing 10A by a plurality of fixing screws 130. A plurality of through holes (not shown) penetrating the flange portion 120 in the plate thickness direction of the flange portion 120 are provided along the circumferential direction of the flange portion 120. The fixing screw 130 is inserted into a through hole of the flange portion 120 and fastened to a screw hole (not shown) provided in the opening end surface 10 ca. Thereby, the cover member 110 is fixed to the opening end face 10ca of the housing 10A.

The cover member main body portion 110 has a changing portion 111 extending in the left-right direction. The changing portion 111 is located on the front side wall portion side between the rear side wall portion 10c1 and the front side wall portion 10c 2. The cover member main body portion 110 has a cover member top surface 112 that is a surface extending from the rear side wall portion 10c1 side to the changing portion 111 in the front-rear direction. The cover member top surface 112 is parallel to the bottom surface 10A1 of the housing 10A. The cover member top surface 112 is a surface facing upward and also extends in the left-right direction.

The cover member main body 110 has a cover member inclined surface 113 that is a surface inclined to the front side from the changing portion 111 toward the lower side. The cover member inclined surface 113 extends in the left-right direction. A plurality of projections (ribs) 114 are provided on the cover member inclined surface 113 in the left-right direction. Each rib 114 extends from the changing portion 111 toward the flange portion 120. By providing the ribs 114, the rigidity of the cover member 100 is improved. As a result, noise due to vibration of the cover member 100 is reduced.

The changing portion 111 is located between the cover member top surface 112 and the cover member inclined surface 113 and extends in the left-right direction. As shown in fig. 8, the changing portion 111 in the present embodiment is an arc-shaped curved surface connecting the front end of the cover member top surface 112 and the upper end of the cover member inclined surface 113. The changing portion 111 is not limited to a curved surface, and may be a flat surface that linearly connects the front end of the cover member top surface 112 and the upper end of the cover member inclined surface 113. Alternatively, the changing portion 111 may be a linear portion directly connecting the front end of the cover member top surface 112 and the upper end of the cover member inclined surface 113. In this way, the changing portion 111 may be a line or a plane extending in the left-right direction.

As shown in fig. 8, the vertical length of the recess of the cover member main body portion 110 increases from the rear side wall portion 10c1 side toward the changing portion 111, and increases from the front side wall portion 10c2 side toward the changing portion 111. The vertical length of the recess of the lid member body 119 is a vertical length from the opening end surface 10ca of the housing 10A to the lid member top surface 112, and a vertical length from the opening end surface 10ca of the housing 10A to the lid member inclined surface 113.

That is, the vertical length of the case 10A from the opening end face 10ca to the cover member top face 112 is longer from the rear side wall portion 10c1 side toward the changing portion 111. Further, the vertical length of the case 10A from the opening end surface 10ca to the cover member inclined surface 113 increases from the front side wall portion 10c2 side toward the changing portion 111.

As described above, the cover member 100 in the second embodiment has the internal space recessed from the opening end surface 10ca of the housing 10A to the upper side. In the second embodiment, the opening end face 10ca is inclined downward from the bottom face 10a1 as it goes from the rear side to the front side when viewed in the left-right direction. Therefore, a part of the capacitor 23 and a part of the control board 21 are exposed to the upper side of the case 10A. The lid member 100 having an internal space recessed upward is fixed to the opening end surface 10ca of the case 10A, and components exposed upward from the case 10A are housed in the internal space of the lid member 100.

In the second embodiment, the case 10A has an opening end surface 10ca, and the opening end surface 10ca is inclined downward from the bottom surface 10A1 as going from the rear side to the front side. In the second embodiment, the cover member 100 has a cover member inclined surface 113 that is a surface inclined to the front side as going from the changing portion 111 to the lower side. As a result, as shown in fig. 10, even when the housing space of the inverter unit 1A is narrowed by providing the interference member 200 in the housing space, the inverter unit 1A can be easily provided in the housing space while avoiding the interference member 200.

As described above, the inverter unit 1A according to the second embodiment includes the case 10A and the cover member 100, the case 10A includes the opening 16 and the bottom surface 10A1, the opening 16 is opened at the upper side in the vertical direction, the bottom surface 10A1 is positioned at the lower side in the vertical direction and is orthogonal to the vertical direction, and the cover member 100 is attached to the case 10A so as to cover the opening 16. In the second embodiment, the case 10A has an opening end surface 10ca that is an end surface surrounding the outer periphery of the opening 16, and at least a part of the opening end surface 10ca is inclined with respect to the bottom surface 10A 1.

According to the second embodiment described above, even in the case where the housing space is narrowed due to the provision of the interference member 200 in the housing space, the inverter unit 1A can be easily provided in the housing space while avoiding the interference member 200.

In the second embodiment, the opening end surface 10ca is inclined downward in the vertical direction from the rear side wall portion 10c1 toward the front side wall portion 10c2 as viewed in the left-right direction.

Thereby, particularly in the case where the interference member 200 is provided in the housing space and on the front side of the inverter unit 1A, the inverter unit 1A can be easily provided in the housing space while avoiding the interference member 200.

Further, in the second embodiment, the lid member main body portion 110 has a shape recessed from the flange portion 120 to the upper side in the up-down direction. That is, the cover member 100 has an internal space recessed upward from the opening end face 10ca of the housing 10A.

The lid member 100 having an internal space recessed upward is fixed to the opening end surface 10ca of the case 10A, and components exposed upward from the case 10A can be accommodated in the internal space of the lid member 100.

In the second embodiment, the vertical length of the recess of the cover member main body portion 110 is longer from the rear side wall portion 10c1 side toward the changing portion 111, and is longer from the front side wall portion 10c2 side toward the changing portion 111.

Thus, the cover member 100 is provided with a cover member inclined surface 113 that is a surface inclined to the front side as going from the changing portion 111 to the lower side. As a result, particularly in the case where the interference member 200 is provided in the housing space and on the front side of the inverter unit 1A, the inverter unit 1A can be easily provided in the housing space while avoiding the interference member 200.

In addition, in the second embodiment, the cover member main body portion 110 has a cover member top surface 112 that is a surface extending from the rear side wall portion 10c1 side to the changing portion 111 in the front-rear direction. The cover member top surface 112 is parallel to the bottom surface 10A1 of the housing 10A.

Thus, when the inverter unit 1A is disposed in the housing space, the space above the cover member top surface 112 can be effectively used.

In the second embodiment, the cover member inclined surface 113 is inclined to the front side, and the cover member top surface 112 is parallel to the bottom surface 10a1, but is not limited thereto. For example, the inclination angle of the cover member top surface 112 and the cover member inclined surface 113 with respect to the bottom surface 10a1 can be changed according to the storage space of the inverter unit 1A or the shape of the interference member 200.

In the second embodiment, at least a part of the opening end surface 10ca of the case 10A is located below the upper end surface 23a of the capacitor 23 in the vertical direction.

Thus, since a part of the opening end surface 10ca of the housing 10A is disposed at a vertically low position, the inclination angle of the opening end surface 10ca becomes steeper. As a result, the inverter unit 1A can be easily provided in a narrower housing space.

While various embodiments of the present invention have been described above, the configurations and combinations thereof in the embodiments are merely examples, and additions, omissions, substitutions, and other changes in the configurations can be made without departing from the spirit of the present invention. The present invention is not limited to the embodiments.

Industrial applicability of the invention

According to the aspect of the present invention, it is possible to provide an inverter unit and a motor unit that can be easily installed in a narrow storage space. Therefore, the present invention is industrially applicable.

Description of the symbols

1. 1A inverter unit

2 Motor

3 Motor Unit

9 external power supply device

10. 10A casing

16 opening part

10a1 bottom surface

10ca open end face

10c1 rear side wall part (first side wall part)

10c2 front side wall (second side wall)

10c3 fastening part

22 power base board (Circuit board)

23 capacitance

30 wiring part

40 first cover member

50 second cover member

100 cover member

110 cap member body portion

111 change part

112 cover member top surface

120 flange portion.

Claims (8)

1. An inverter unit that converts direct current into alternating current and supplies the alternating current to a motor, characterized by comprising:

a housing having an opening portion that opens at one side in a first direction and a bottom surface that is located at the other side in the first direction and is orthogonal to the first direction;

a circuit board housed in the case;

a wiring section that connects the circuit board and an external power supply device; and

a cover member attached to the housing so as to cover the opening,

the case has an opening end surface which is an end surface surrounding the outer periphery of the opening,

at least a portion of the open end face is inclined with respect to the bottom face.

2. The inverter unit of claim 1,

the housing has:

a first side wall portion and a second side wall portion that extend in a second direction orthogonal to the first direction and are opposite to each other; and

a fastening portion disposed on the first side wall portion and fastened to a housing of the motor,

the opening end surface is inclined to the other side in the first direction as viewed from the second direction, from the first side wall portion toward the second side wall portion.

3. The inverter unit according to claim 1 or 2,

the cover member has:

a lid member main body portion that covers the opening portion; and

a flange portion provided on an outer peripheral edge of the lid member main body portion and connected to the opening end surface,

the lid member main body portion has a shape recessed from the flange portion to one side in the first direction.

4. The inverter unit of claim 3,

the cover member main body portion has a changing portion extending in the second direction,

the changing portion is located on the second side wall portion side between the first side wall portion and the second side wall portion,

the first direction length of the recess of the cover member main body portion becomes longer as going from the first side wall portion side toward the changing portion, and becomes longer as going from the second side wall portion side toward the changing portion.

5. The inverter unit of claim 4,

the cover member main body portion has a cover member top surface parallel to the bottom surface, the cover member top surface being a surface from the first side wall portion side to the changing portion.

6. The inverter unit according to claim 4 or 5,

the change portion is a line or a plane extending along the second direction.

7. The inverter unit according to any one of claims 1 to 6,

also comprises a capacitor which is accommodated in the shell,

the capacitor has a face facing one side of the first direction, that is, an upper end face,

at least a part of the opening end surface of the case is located on the other side in the first direction than the upper end surface of the capacitor.

8. A motor unit, comprising:

the inverter unit of any one of claims 1 to 7; and

a motor to which an alternating current is supplied from the inverter unit.

Images