Electric compressor

Abstract

[Problem] To provide a reinforcement structure for an electric compressor that prevents the space inside the inverter housing from collapsing even if a strong force acts on the electric compressor due to a frontal collision of the vehicle, when mounting legs are formed on the outer surface of a cover that the inverter housing has at the end-most side in the axial direction of the electric compressor. [Solution] The housing 6 of the electric compressor 1 has an inverter housing 9 consisting of a side wall portion 91 and a partition wall 92 and accommodating an inverter device 5, and the inverter housing 9 is closed off at the front of the electric compressor 1 by a cover 10 having mounting legs 103 formed thereon, and the outer surface of the cover 10 has a hollow protrusion 104 that protrudes in a dome shape centered on the mounting leg 103, which distributes the load applied from the front of the electric compressor 1 and prevents the space inside the inverter housing 9 from collapsing. [Selected figure] Figure 3

Description

[Technical Field]

[0001] The present invention relates to an electric compressor having a compression mechanism that compresses a refrigerant, an electric motor that drives the compression mechanism, and an inverter control device that controls the electric motor, the inverter control device being accommodated in an inverter housing, and in particular, to an electric compressor having mounting legs formed on the outer surface of a cover that closes an opening in the inverter housing at the front of the electric compressor, for mounting to a mounting object. Electric compressor Regarding. [Background technology]

[0002] As shown in Patent Document 1, for example, this type of electric compressor has a compression section that compresses the refrigerant, an electric motor that drives the compression section, and a motor drive circuit that controls the electric motor, arranged in that order along the axial direction of the drive shaft, with the compression section and electric motor housed in a housing member, and mounting legs for attaching the electric compressor to a target body formed integrally with the compression section-housing side and the electric motor-housing side of the side wall of the housing member, respectively.

[0003] In contrast to this, the electric compressor shown in Patent Document 2 has a configuration in which the compression section and the electric motor are housed within a first housing component, and the motor drive circuit is housed within an accommodation space formed by both the first housing component and a second housing component joined to the first housing component, and the mounting legs for mounting the electric compressor to a mounting target are integrally formed on the side wall portion of the first housing component and also on the flat outer surface of a cover that closes the opening of the second housing component. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-105578 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-150236 Summary of the Invention [Problem to be solved by the invention]

[0005] As in the electric compressor described in Patent Document 2, when mounting legs for mounting to a mounting target are formed on the flat outer surface of the cover that closes the second housing component of the electric compressor, and the electric compressor is mounted on a vehicle as a component of the refrigeration cycle of a vehicle air conditioner in a form supported via the mounting legs of the cover so that the second housing component is on the rear side of the vehicle, the forwardmost cover of the electric compressor is the part supported by the vehicle. Therefore, if the front of the vehicle is damaged in a vehicle collision or the like, the entire outer surface of the cover will bear a strong load from the axial front of the electric compressor due to direct contact due to the damage and / or indirect impact from parts in the engine compartment that are moved by the collision, and there is a risk that the cover will buckle, deform, or the like, and the accommodation space for the motor drive circuit will be crushed.

[0006] If the space for accommodating the motor drive circuit is crushed, the components that constitute the motor drive circuit housed in the second housing component may be damaged in an energized state, which may result in a short circuit or electric shock.

[0007] The present invention has been made to solve the above-mentioned problems, and when mounting legs are formed on the outer surface of the cover of the inverter housing at the end closest to the axial direction of the electric compressor, even if a strong force is applied to the electric compressor due to a frontal collision of the vehicle, the risk of the space inside the inverter housing collapsing and causing a short circuit or other danger is reduced. Electric compressor The purpose is to provide. [Means for solving the problem]

[0008] To achieve the above objectives, The electric compressor according to the present inventionThe electric compressor includes a compression mechanism for compressing a refrigerant, an electric motor for driving the compression mechanism, an inverter control device for controlling the electric motor, and a housing, the housing having an inverter housing for accommodating the inverter control device, the inverter housing being closed on the side opposite to the electric motor by a cover, and mounting legs for mounting to a mounting body being formed on the outer surface of the cover, characterized in that the cover is provided with a hollow protrusion that protrudes in a dome shape centered on the mounting legs. Mounting legs are also provided on side walls of components constituting the housing other than the inverter housing (e.g., a motor housing). The mounting body is, for example, an automobile or other vehicle.

[0009] As a result, even when the electric compressor is supported on an object to be mounted, such as a vehicle, by the mounting legs of the cover located on the front side of the electric compressor, the entire outer surface on which the mounting legs of the cover are formed is not made flat, but rather has a hollow protrusion that protrudes in a dome shape centered on the mounting leg.Therefore, when a strong force is applied to the electric compressor from both sides in the axial direction due to a collision at the front of the vehicle, for example, the load from the front of the electric compressor is distributed by the hollow protrusion of the cover, preventing the cover from buckling or deforming and making it possible to prevent the space inside the inverter housing from collapsing.

[0010] Here, the inverter housing of the electric compressor is The inverter housing has a protrusion that protrudes radially outward beyond the hollow protrusion of the cover. The cover also has a protrusion that extends in the same direction as the protrusion of the inverter housing.

[0011] Such a protrusion can be formed without concern for the space inside the inverter housing collapsing by providing a dome-shaped hollow protrusion on the cover. The presence of the protrusion not only increases the volume of the space inside the inverter housing but also increases the area of ​​the outer surface of the inverter housing facing the motor, thereby improving the freedom of layout of the components of the inverter control device and the connecting components to the inverter control device.

[0012] Furthermore, the electric compressor according to the present invention comprises:The cover is characterized in that strip-shaped ribs are provided on the outer surface of the cover, extending from the mounting legs in a direction intersecting the axial direction of the mounting leg insertion holes. The ribs extend, for example, from both sides of the mounting legs toward the side wall of the cover.

[0013] In this way, by providing a rib extending from the mounting leg in a direction intersecting the axial direction of the mounting leg insertion hole on the outer surface of the hollow protrusion of the cover, the rib can suppress the force applied to the hollow protrusion that tends to crush the hollow protrusion, thereby improving the strength of the cover.

[0014] Furthermore, the electric compressor according to the present invention is The side wall of the cover has a thick portion formed in a portion adjacent to the periphery of the hollow protrusion, the thick portion being thicker than the remaining portion of the side wall of the cover, and the side wall of the inverter housing has a thick portion formed in a portion abutting against the thick portion of the side wall of the cover, the thick portion being thicker than the remaining portion of the side wall of the inverter housing. The thick portion of the side wall of the cover and the thick portion of the side wall of the inverter housing overlap with the portion where the end of the rib reaches the outer edge of the cover.

[0015] This relatively increases the contact area between the end face of the portion of the side wall of the cover that is continuous with the periphery of the hollow protrusion and the end face of the side wall of the inverter housing that abuts against it, making it possible to reduce the surface pressure applied from the end face of the cover to the end face of the inverter housing.Furthermore, by arranging the side wall of the cover and the thickened portion of the side wall of the inverter housing so that they overlap with the portion where the end of the rib reaches the outer edge of the cover, the force applied to the hollow protrusion can be borne by the side wall of the cover and the thickened portion of the side wall of the inverter housing via the rib.

[0016] Furthermore, the electric compressor according to the present invention comprises: A bridging portion protrudes from the outer surface of the cover, and the bridging portion extends from the axial side end of the mounting leg insertion hole along the axial direction of the mounting leg insertion hole to the outer edge of the cover on the protruding portion side of the inverter housing.

[0017] As a result, the bridging portion extending from the axial side end of the insertion hole of the mounting leg to the outer edge of the protrusion allows the load applied to the hollow protrusion to be supported by the side wall portion of the cover and the side wall portion of the inverter housing, so even if a protrusion is formed on the inverter housing that protrudes radially outward beyond the hollow protrusion of the cover, the protrusion can be prevented from being crushed. [Effects of the Invention]

[0018] As described above, according to the present invention, even when the electric compressor is supported on a vehicle by mounting legs of a cover located in front of the electric compressor, the outer surface on which the mounting legs of the cover are formed is not entirely flat, but is provided with hollow protrusions that protrude in a dome shape centered on the mounting legs. Therefore, when a strong force is applied from both sides in the axial direction of the electric compressor due to a frontal collision or the like of the vehicle, the load from the front of the electric compressor is dispersed by the hollow protrusions of the cover, preventing the space within the inverter housing from collapsing. This also prevents damage to components such as switching elements that make up the inverter control device, and prevents the risk of short circuits and electric shock caused by damage to charged components of the inverter control device. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic view showing a mounting position of an electric compressor to which the present invention is applied in a vehicle; [Figure 2] FIG. 2 is an overall side view of the electric compressor. [Figure 3] FIG. 2 is a perspective view showing the electric compressor as viewed from the front. [Figure 4] FIG. 2 is a cross-sectional view of the entire electric compressor. [Figure 5] FIG. 3(a) is a front view of a cover which is a component of the electric compressor, and FIG. 3(b) is a rear view of the cover. [Figure 6] FIG. 4 is a perspective view showing the cover as viewed from the rear side. [Figure 7] FIG. 2 is a perspective view showing the electric compressor with a cover removed. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0021] An electric compressor 1 to which the present invention is applied is shown in Figures 1 to 7. In Figure 1, the left side of the figure is the front of a vehicle 500, and the right side of the figure is the rear of the vehicle 500. In Figure 2, the right side of the figure is the front of the electric compressor 1, and the left side of the figure is the rear of the electric compressor 1.

[0022] The electric compressor 1 to which the present invention is applied is a scroll compressor used in a refrigeration cycle (not shown) of a vehicle air conditioner, and as shown in FIG. 1, is mounted on the front of a vehicle 500, and is installed so that the rear of the electric compressor 1 faces the front of the vehicle 500 due to the arrangement of mounting legs 84, 85, and 103 described below.

[0023] The electric compressor 1 includes a compression mechanism 2 that compresses a refrigerant, an electric motor 3 that drives the compression mechanism 2, a drive shaft 4 that transmits power from the electric motor 3 to the compression mechanism 2, an inverter control device 5 that controls the electric motor 3, and a housing 6 that forms the outer shape of the electric compressor 1. In this embodiment, the housing 6 is formed by a compressor housing 7 that houses the compression mechanism 2, a motor housing 8 that houses the electric motor 3, and an inverter housing 9 that houses the inverter control device 5.

[0024] The compressor housing 7, which is located at the rearmost position of the electric compressor 1, is cylindrical in shape with a bottom, with the rear side of the electric compressor 1 closed and the front side of the electric compressor 1 open.On the rear side of the electric compressor 1, there is a discharge chamber 11, an oil separator 12, and an oil storage chamber 13, and further, an outlet port 72 for discharging refrigerant from the discharge chamber 11 to the external refrigeration cycle is formed in the side wall portion 71.

[0025] The compression mechanism 2 accommodated in the compressor housing 7 on the front side of the discharge chamber 11 is a scroll type having a fixed scroll 16 and an orbiting scroll 17 disposed opposite to the fixed scroll 16.

[0026] The fixed scroll 16 and the orbiting scroll 17 have spiral walls 16c, 17b extending from their respective base plates 16a, 17a that mesh with each other, thereby forming a compression chamber 20 in the space surrounded by the base plate 16a and spiral wall 16c of the fixed scroll 16 and the base plate 17a and spiral wall 17b of the orbiting scroll 17. The space between the outer peripheral wall 16b of the fixed scroll 16 and the outermost peripheral portion of the spiral wall 17b of the orbiting scroll 17 forms a suction chamber 21 through which refrigerant is drawn into the compression chamber 20. The fixed scroll 16 has a discharge port 16d, which is a through-hole, formed approximately in the center of the base plate 16a, and the refrigerant is discharged from the compression chamber 20 to the discharge chamber 11 via a discharge valve 22 provided on the rear end face of the base plate 16a. The orbiting scroll 17 has a fitting hole 17c formed in the center of the front side of the electric compressor 1 of the base plate 17a, into which a radial bearing 26 for mounting the drive shaft 4 described below to the orbiting scroll 17 is fitted.

[0027] The motor housing 8 has a cylindrical side wall portion 81 with openings on both the front and rear sides of the electric compressor 1, and is disposed closer to the inverter housing 9 than the compressor housing 7. In this embodiment, a pin-and-ring coupling type rotation prevention mechanism 35 is provided between the motor housing 8 and the orbiting scroll 17. This converts the rotational motion of the drive shaft 4 into the orbiting motion of the orbiting scroll 17, causing the volume of the compression chamber 20 to increase or decrease.

[0028] The electric motor 3 is housed in the motor housing 8 and is composed of a stator 31 and a rotor 32 fixed inside the stator 31 so as to rotate integrally with the drive shaft 4. The rotor 32 is rotated by the rotational magnetic force generated in the stator 31.

[0029] The motor housing 8 has an inlet port 82 on a side surface of a side wall portion 81 for taking in refrigerant gas from an external refrigeration cycle into the electric compressor 1. The refrigerant gas flows from the inlet port 82 into a space portion 83 of the motor housing 8, cools the electric motor 3, and then reaches the suction chamber 21 of the compressor housing 7.

[0030] The inverter housing 9, which is located at the front end of the electric compressor 1, has a cylindrical shape with a bottom and is open on the front side of the electric compressor 1, and is made up of a cylindrical side wall 91 and a partition wall 92 that closes the rear side of the side wall 91 relative to the electric compressor 1. The inverter control device 5 is configured with a circuit board 51, switching elements 52 arranged on the circuit board 51, and other components, and is housed in an inverter chamber 93 formed by the inverter housing 9 and a cover 10. A gasket 95 is sandwiched between the end faces of the inverter housing 9 and the cover 10 to ensure airtightness within the inverter chamber 93.

[0031] One end of the drive shaft 4 is rotatably supported by a bearing 23 held in a recess 92a formed in the center of the partition wall 92 of the inverter housing 9. The other end of the drive shaft 4 is rotatably supported by a bearing 24 held in a space 83 of the motor housing 8. Furthermore, an eccentric shaft 4a is provided at the rear end of the drive shaft 4 at a position eccentric with respect to the axis of the drive shaft 4, and a bushing 25 is fitted around the eccentric shaft 4a. The outer peripheral surface of the bushing 25 is fitted inside a radial bearing 26 fitted into a fitting hole 17c of the orbiting scroll 17.

[0032] In the above configuration, when the drive shaft 4 is rotationally driven by the electric motor 3, the orbiting scroll 17 orbits around the axis of the fixed scroll 16 via the eccentric shaft 4a. As a result, the refrigerant that flows into the housing 6 from the inlet port 82 passes through the suction chamber 21 and is introduced into the compression chamber 20. The refrigerant compressed in the compression chamber 20 is discharged from the discharge port 16d of the fixed scroll 16 into the discharge chamber 11, whereupon the oil is separated in the oil separator 12 and sent to the external refrigeration cycle from the outlet port 72, and the separated oil is sent to the oil reservoir 13.

[0033] As shown in Fig. 4 , the inverter housing 9 of the electric compressor 1 to which the present invention is applied has a cylindrical side wall 91 that opens toward the front of the electric compressor 1, and this opening is closed by a cover 10 that is separate from the inverter housing 9. The cover 10 has a front wall 101 that is located toward the front of the electric compressor 1 and a side wall 102 that abuts against the side wall 91 of the inverter housing 9. The inverter housing 9 and the cover 10 have bolt mounting holes 94, 108 formed in the side wall 91, 102, respectively, and are assembled by inserting bolts 200 into the bolt mounting holes 94, 108 with the bolt mounting holes 94 and 108 appropriately communicating with each other.

[0034] 2 to 4, mounting legs 84, 85 for mounting the electric compressor 1 to the vehicle 500 are formed on the upper and lower sides of the side of the motor housing 8, and a mounting leg 103 for mounting the electric compressor 1 to the vehicle 500 is formed on the outer surface of the front wall portion 101 of the cover 10 (the front side of the electric compressor 1). Each mounting leg 84, 85, 103 has a quadrangular prism shape, and its longitudinal direction extends in a direction intersecting with the axial direction of the drive shaft 4. Insertion holes 84a, 85a, 103a into which bolts (not shown) are inserted are opened on the longitudinal side surfaces of each mounting leg 84, 85, 103.

[0035] When the electric compressor 1 is mounted with its rear facing the front of the vehicle 500 as shown in FIG. 1, the cover 10 on which the mounting legs 103 are provided is located at the rear side of the vehicle 500. Therefore, if the front of the vehicle 500 shown in FIG. 1 is damaged due to a collision or the like, a strong force (white arrow) will be applied to the electric compressor 1 from the front of the vehicle 500 (rear of the electric compressor 1), as shown in FIG. 2, and the cover 10 attached to the vehicle 500 by the mounting legs 103 will support that load (black arrow). Furthermore, as the body of the vehicle 500 deforms, components and parts inside the engine compartment may move and come into contact with the electric compressor 1, potentially exerting a large force. Even in such a case, a strong force may be applied to the cover 10 on which the mounting legs 103 supporting the front of the electric compressor 1 are provided.

[0036] In the present invention, the cover 10 and the inverter housing 9 have the following configuration so that the inverter chamber 93 of the electric compressor 1 is not crushed by a strong load caused by a collision of the vehicle 500 or the like.

[0037] As shown in Figures 2 to 6, the cover 10 has a hollow protrusion 104 in a substantially semispherical dome shape that projects from the mounting leg 103 to the front of the electric compressor 1 on the front wall 101. In addition, since the hollow protrusion 104 is provided on the front wall 101 of the cover 10, the cover 10 is attached to the vehicle 500 by the mounting leg 103, and the inverter housing 9 has a protrusion 9a that protrudes radially outward from the hollow protrusion 104 of the cover 10, as shown in Figures 2 and 3. In this way, the protrusion 9a of the inverter housing 9 expands the opening of the side wall 91, so that the cover 10 also has a protrusion 10a that protrudes in the same direction as the protrusion 9a of the inverter housing 9 to close the opening of the side wall 91, as shown in Figures 2, 3, 5 and 6.

[0038] As shown in Figure 5, the cover 10 has a plurality (three in this embodiment) of strip-shaped ribs 105 and a plurality (four in this embodiment) of strip-shaped ribs 106 formed on the outer surface of the hollow protrusion 104 of the front wall portion 101, extending in a direction intersecting the axial direction of the insertion hole 103a of the mounting leg.

[0039] The ribs 105 extend linearly from a base end on the upper side of the mounting leg 103 (above the electric compressor 1) in a direction inclined toward the protruding portion 10a. In this embodiment, a rib 105' that is wider than any of the three ribs 105 is formed closer to the protruding portion 10a than the rib 105 located closest to the protruding portion 10a. The rib 105' extends linearly from a base end on the upper side of the mounting leg 103 to the end of the thick portion 102a on the protruding portion 10a side, described below, on the bolt mounting hole 108 side.

[0040] The rib 106 extends linearly from a base end on the lower side of the mounting leg 103 (below the electric compressor 1) in a direction inclined away from the protruding portion 10a. In this embodiment, two ribs 106' extending in the same direction and at an incline as the rib 106 are formed closer to the protruding portion 10a than the rib 106 located closest to the protruding portion 10a. The ribs 106' extend from a bridge portion 107 (described below) as a base end, and are located on the outer surface of the front wall portion 101 excluding the hollow protrusion 104, from at least the tip to the middle portion in the extension direction.

[0041] 5 and 6, the side wall portion 102 of the cover 10 has a thick portion 102a formed in a portion of the side wall portion 102 that is continuous with the periphery of the hollow protrusion 104 and that is located on an extension of the plurality of ribs 105. The thick portion 102a is formed above the hollow protrusion 104 and is thicker than the other portions of the side wall portion 102. The thick portion 102a is formed above the electric compressor 1 than the hollow protrusion 104. The side wall portion 102 of the cover 10 has a thick portion 102b formed in a portion of the side wall portion 102 that is continuous with the periphery of the hollow protrusion 104 and that is located on an extension of the plurality of ribs 106. The thick portion 102b is formed below the hollow protrusion 104 and is thicker than the other portions of the side wall portion 102.

[0042] 7, the side wall 91 of the inverter housing 9 also has thick portions 91a, 91b formed at positions corresponding to the thick portions 102a, 102b of the side wall 102 of the cover 10, which are thicker than the other portions of the side wall 91. That is, of the thick portions 91a, 91b of the inverter housing 9, the portions that are continuous with the periphery of the hollow protrusion 104 and that are located on the extension line of the rib 105 or 106 are thicker than the other portions of the side wall 91.

[0043] On the other hand, the gasket 95 sandwiched between the side wall 91 of the inverter housing 9 and the side wall 102 of the cover 10 has a uniform width over the entire periphery to ensure uniform surface pressure, as shown by the two-dot chain line in Fig. 5(b). Therefore, at the thick portions 102a and 102b of the cover 10, the outer surface side portions of the thick portions of the side wall 102 protrude from the gasket 95.

[0044] Furthermore, the cover 10 has a bridge portion 107 that protrudes from the outer surface of the front wall portion 101. The bridge portion 107 extends from the protruding portion 10a of the mounting leg 103 along the axial direction of the mounting leg insertion hole 103a, and its terminal end extends to the outer edge (side wall portion 102) of the protruding portion 9a of the cover 10. The bridge portion 107 is cut out in an arc shape so as not to interfere with the insertion of a bolt into the mounting leg insertion hole 103a.

[0045] As a result, by providing the mounting legs 103 on the cover 10, a force received by the cover 10 from the front of the electric compressor 1 via the mounting legs 103 is first dispersed by the semispherical, dome-shaped hollow protrusions 104 on the front wall 101 of the cover 10, centered on the mounting legs 103. The force dispersed by the hollow protrusions 104 is transmitted to the thick portions 102a, 102b located above and below the side wall 102 of the cover 10 by ribs 105 that are arranged above the mounting legs 103 on the outer surface of the hollow protrusions 104 and extend from the mounting legs 103 toward the upper side of the electric compressor 1, and by ribs 106 that are arranged below the mounting legs 103 on the outer surface of the hollow protrusions 104 and extend from the mounting legs 103 toward the lower side of the electric compressor 1. Furthermore, since the thick portions 102a, 102b of the side wall portion 102 of the cover 10 abut against the thick portions 91a, 91b of the side wall portion 91 of the inverter housing 9, the force from the front of the electric compressor 1 is ultimately supported by the side wall portion 102 of the cover 10 and the side wall portion 91 of the inverter housing 9.

[0046] Furthermore, a bridge portion 107 is formed extending in the axial direction of the insertion hole 103a of the mounting leg 103, and this bridge portion 107 reaches from the longitudinal end of the mounting leg 103 to the side wall portion 102, so that the force dispersed from the hollow protrusion 104 toward the side of the electric compressor 1 is supported by the bridge portion 107, whose end reaches the side wall portion 102.

[0047] This prevents the front wall 101 of the cover 10 from buckling or deforming, and the inverter chamber 93 from collapsing.

[0048] Furthermore, since the thick portions 102a, 102b of the side wall portion 102 of the cover 10 protrude from the gasket 95, even if a strong force acts from the front of the electric compressor 1, the protruding portion of the side wall portion 102 can deform until it abuts against the opposing side wall portion 91 of the inverter housing 9, thereby absorbing the strong force caused by the impact. [Explanation of symbols]

[0049] 1 Electric compressor 2. Compression mechanism 3 Electric motor 5. Inverter control device 6. Housing 9 Inverter housing 9a Protrusion 91 Side wall 91a Thick part 91b Thick part 93 Inverter Room 10 Cover 10a Protrusion 101 Front wall 102 Side wall 102a Thick part 102b Thick part 103 Mounting leg 103a Insertion hole 104 Hollow protrusion 105 Ribs 106 Ribs 107 Crosslinked part 500 Vehicle (mounted body)

Claims

1. a compression mechanism that compresses a refrigerant, an electric motor that drives the compression mechanism, an inverter control device that controls the electric motor, and a housing; the housing includes an inverter housing that accommodates the inverter control device, In an electric compressor, the inverter housing is closed by a cover on the side opposite to the electric motor, and mounting legs for mounting to a mounting body are formed on an outer surface of the cover, The cover is provided with a hollow protrusion that protrudes in a dome shape with the mounting leg as the center, The inverter housing has a protrusion that protrudes radially outward beyond the hollow protrusion of the cover. An electric compressor characterized by the above.

2. 2. The electric compressor according to claim 1, wherein a rib is provided on an outer surface of the cover, the rib extending from the mounting leg in a direction intersecting an axial direction of the insertion hole of the mounting leg.

3. A thick portion is formed in a portion of the side wall of the cover that is connected to the periphery of the hollow protrusion and that is thicker than the thickness of the other portion of the side wall of the cover; 3. The electric compressor according to claim 1, wherein a thick portion is formed at a portion of the side wall of the inverter housing that abuts against the thick portion of the side wall of the cover, the thick portion being thicker than the thickness of other portions of the side wall of the inverter housing.

4. 2. The electric compressor according to claim 1, wherein a bridging portion protrudes from an outer surface of the cover, and the bridging portion extends from an axial side end of the mounting leg insertion hole along the axial direction of the mounting leg insertion hole to an outer edge of the cover on a side of the protruding portion of the inverter housing.

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