JP2017129058A - Electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely protect an electric compressor from external force applied to a vehicle.SOLUTION: An abutment part 7c of an attachment leg 7a integrally formed with a housing 7 is abutted to a mount 27 of an engine 17, an attachment bolt 25 is inserted into a through hole 7b of the attachment leg 7a, a head 25a of the attachment bolt 25 is locked to a locking part 7d of the attachment leg 7a, and a screw 25b of the attachment bolt 25 is fastened to the mount 27. A protrusion 7e which is integrally protruded on the locking part 7d of the attachment leg 7a and extends to a direction opposite from the mount 27 side is arranged in a position protruded outside of an outer shape of the housing 7 so that external force is transmitted to an end 7f of the protrusion 7e first.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a compressor for a refrigeration cycle mounted on a vehicle, and more particularly to an electric compressor using an electric motor as a power source.

  A compressor used in a refrigeration cycle of a vehicle is generally disposed in an engine room and attached to an engine block or the like. Among such in-vehicle compressors, there is an electric compressor having an electric motor as a power source of a refrigerant compression mechanism, and electric power from a power source is supplied to the electric motor and its drive circuit. This electric power becomes a high voltage of 50 to 400 V in a hybrid vehicle (HEV) or an electric vehicle (EV) using a motor as power assist or power of the vehicle.

  Therefore, in a hybrid vehicle (HEV) or an electric vehicle (EV), when an excessive external force is applied to the vehicle due to a collision or the like, the electric compressor is covered with a cover so that a high-voltage electric leakage does not occur due to damage to the housing of the electric compressor. It has already been proposed to protect. In the proposal, a cover is attached to a portion of the housing of the electric compressor housing the drive circuit, and the drive circuit is protected by deflecting the external force reaching the cover from the drive circuit side by the cover (for example, patents). Reference 1).

Japanese Patent No. 4958898

  In the proposed technique described above, since the external force is once received by the cover, the cover and the housing of the electric compressor to which the cover is attached receive the external force applied from the outside of the vehicle. Therefore, if the direction conversion function of the external force by the cover is not sufficient for the magnitude of the external force, the drive circuit cannot be reliably protected from the external force if the housing of the electric compressor does not have the rigidity to compensate for it. .

  This invention is made | formed in view of the said situation, The objective of this invention is providing the electric compressor which can protect an electric compressor from the external force added to a vehicle reliably.

In order to achieve the above object, the electric compressor of the present invention is
In an electric compressor that houses a refrigerant compression mechanism and an electric motor that drives the compression mechanism in a housing,
A mounting leg formed integrally with the housing and abutted against a mounting target of the housing;
An attachment member for attaching the attachment leg brought into contact with the attachment object to the attachment object by fastening to the attachment object in a state of being locked to the attachment leg;
A projecting member that extends from the mounting leg to the opposite side of the mounting target and has a tip disposed outside the outer shape of the housing;
Is provided.

  ADVANTAGE OF THE INVENTION According to this invention, an electric compressor can be reliably protected from the external force added to a vehicle.

It is a front view which shows the electric compressor which concerns on one Embodiment of this invention. It is explanatory drawing which shows arrangement | positioning in the vehicle of the electric compressor shown in FIG. It is the II sectional view taken on the line of FIG. (A)-(e) is explanatory drawing which shows the example of a planar shape of the end surface employ | adopted at the front-end | tip of the projection part of the attachment leg of FIG. It is a front view of the electric compressor which employ | adopted the planar shape of FIG.4 (d) at the front-end | tip of the projection part of the attachment leg shown in FIG. It is a front view of the electric compressor which employ | adopted each planar shape of Fig.4 (a)-(c), (e) at the front-end | tip of the projection part of the attachment leg shown in FIG. It is a side view which cuts and shows the electric compressor which concerns on other embodiment of this invention partially. It is a front view which shows the electric compressor which concerns on further another embodiment of this invention. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an electric compressor according to an embodiment of the present invention.

  The electric compressor 1 of the present embodiment shown in FIG. 1 has a housing 7 in which the compression mechanism 3 and the electric motor 5 are accommodated, and the drive circuit 9 for the electric motor 5 is also accommodated in the housing 7.

  Although detailed illustration is abbreviate | omitted, the compression mechanism 3 compresses the refrigerant | coolant in space by changing the volume of the space formed between both by rotation of the rotor in a cylinder block, for example.

  The electric motor 5 rotates the rotor of the compression mechanism 3, and the rotary shaft of the rotor of the compression mechanism 3 is connected to the electric motor 5. The drive circuit 9 of the electric motor 5 includes an inverter circuit that converts electric power of a DC power source (not shown) into AC and supplies the electric motor 5 with the inverter circuit and a controller thereof. A high voltage of 50 to 400 V is supplied to the electric motor 5 and its drive circuit 9 from a DC power source (not shown).

  The electric compressor 1 described above is housed together with the motor generator 15 between the left and right side members 13 and 13 as shown in the explanatory view in the engine room 11 of the hybrid vehicle (HEV) 10 shown enlarged in the explanatory diagram of FIG. Fixed to the engine 17. In this state, the electric compressor 1 is accommodated in the engine room 11 with a space between the electric compressor 1 and the radiator 19 in front of the vehicle 10.

  In such a vehicle 10, when excessive external force (external force) is applied to the engine room 11 due to a collision with another vehicle or the like, for example, a bumper apron 21 installed between the front ends of the left and right side members 13, 13. In addition, due to the deformation and movement of the radiator 19 attached thereto, the impact of the external force is transmitted to the electric compressor 1 housed behind them.

  Therefore, in the first embodiment, as shown in FIG. 1, three mounting legs 7 a formed integrally with the housing 7 in order to fix the electric compressor 1 to the engine 17 are used to electrically drive from the impact of external force. The compressor 1 is protected.

  Hereinafter, the mounting leg 7a formed on the right side of the housing 7 in FIG. 1 will be described as an example to fix the electric compressor 1 to the engine 17 and to protect it from the impact of external force.

  FIG. 3 is a cross-sectional view taken along line II of the right mounting leg 7a in the drawing in which the drive circuit 9 is accommodated among the plurality of mounting legs 7a of the housing 7 shown in FIG. As shown in FIG. 3, the mounting leg 7a is formed in a cylindrical shape having a through hole 7b through which a mounting bolt 25 (corresponding to a mounting member in claims) is inserted. The through hole 7b has a contact portion 7c that contacts a mount 27 (corresponding to an attachment target in the claims) to which the engine 17 is fixed, and a locking portion 7d into which a head 25a of a mounting bolt 25 described later is inserted. And open respectively.

  The abutting portion 7 c is disposed at a position protruding outward from the outer shape of the housing 7 in order to separate the housing 7 from the mount 27. The locking portion 7 d is disposed at a position inside the outer shape of the housing 7. A protruding portion 7e (corresponding to a protruding member in the claims) that extends to the side opposite to the mount 27 is integrally formed on the locking portion 7d of the mounting leg 7a.

  The protrusion 7e has a cylindrical shape with an inner diameter larger than the head 25a of the mounting bolt 25, and the tip 7f of the protrusion 7e (corresponding to the tip of the protrusion member in the claims) is from the outer shape of the housing 7. Is also arranged at a position protruding outward. As shown in FIG. 4A, the planar shape of the tip 7f of the protrusion 7e has an annular shape. The other two mounting legs 7a of the housing 7 are similarly configured.

  A mounting bolt 25 used for mounting the housing 7 to the mount 27 of the engine 17 in each mounting leg 7a has a head 25a locked to the locking portion 7d of the mounting leg 7a at one end and the other end. Has a threaded portion 25b. The screw portion 25b is formed at the tip of a shaft portion 25c that is connected to the head portion 25a. The screw portion 25b is formed by inserting the shaft portion 25c of the mounting bolt 25 from the screw portion 25b side into the through hole 7b of the mounting leg 7a and locking the head portion 25a to the locking portion 7d. Protrude from. And it fastens to the mount 27 of the engine 17 which the contact part 7c contacted.

  Thus, the electric compressor 1 is fixed to the engine 17 by fastening the screw portion 25b of the mounting bolt 25 inserted into the through hole 7b of each mounting leg 7a to the mount 27 of the engine 17. As shown in FIG. 2, the electric compressor 1 fixed to the engine 17 is disposed in front of the engine 17 and is accommodated in the engine room 11 with a space between the electric compressor 1 and the radiator 19.

  By attaching the housing 7 of the electric compressor 1 to the mount 27 of the engine 17 using the mounting bolt 25, the tip 7f of the projection 7e of the mounting leg 7a shown in FIG. 3 is connected to the electric compressor 1 in the engine room 11 shown in FIG. It is arranged in front of the housing 7, that is, on the radiator 19 side.

  Therefore, in the electric compressor 1 according to the present embodiment, an excessive external force (external force) is applied to the engine room 11 of the vehicle 10 due to a collision with another vehicle or the like, and the bumper apron 21 of the vehicle 10 or the apron 21 is attached thereto. When the radiator 19 is deformed or moved, the radiator 19 contacts the tip 7f of the projection 7e of each mounting leg 7a before contacting the housing 7.

  The external force transmitted to the tip 7f of the projection 7e of each mounting leg 7a shown in FIG. 3 due to the contact of the radiator 19 is transmitted from the projection 7e to the abutment 7c of the mounting leg 7a via the locking portion 7d. It is transmitted to the high-rigidity mount 27 that is the contact partner of the contact portion 7c.

  That is, the external force applied to the engine room 11 of the vehicle 10 of FIG. 2 is received by the mount 27 via the mounting leg 7a of FIG. 3 contacted by the radiator 19, and accommodates the electric motor 5 of the housing 7 and its drive circuit 9. The part does not receive the external force directly. For this reason, the electric compressor 1 can be protected from an external force applied to the engine room 11.

  Further, the abutting portion 7 c existing in the transmission path of the external force from the radiator 19 that contacts the mounting leg 7 a to the mount 27 corresponds to the fastening position of the screw portion 25 b of the mounting bolt 25 that attaches the housing 7 to the mount 27 with respect to the mount 27. Thus, the shaft portion 25c of the mounting bolt 25 is displaced in the radial direction.

  For this reason, the stress due to the external force transmitted from the radiator 19 is concentrated at a position different from the position on the mount 27 where the axial force due to the fastening of the threaded portion 25b of the mounting bolt 25 is applied (the contact portion of the contact portion 7c). Thus, it is possible to prevent the screw portion 25b from being easily damaged by the stress due to the external force.

  Further, in the electric compressor 1 of the present embodiment, in order to receive an external force applied to the engine room 11 of the vehicle 10, the tip 7 f of the protrusion 7 e of each mounting leg 7 a is at a position protruding outward from the outer shape of the housing 7. Even if it arrange | positions, it is not necessary to arrange | position the latching | locking part 7d of the attachment leg 7a in the position outside the outer shape of the housing 7 according to it.

  For this reason, when a standard product is used as the mounting bolt 25, even if the head portion 25 a of the mounting bolt 25 in which the screw portion 25 b is fastened to the mount 27 of the engine 17 is arranged inside the outer shape of the housing 7, The locking part 7d of the mounting leg 7a of the locking partner can be arranged according to the position of 25a.

  The planar shape of the tip 7f of the projection 7e of the mounting leg 7a is not limited to the annular shape shown in FIG. 4 (a), but also the U-shape and the shape shown in FIGS. 4 (b) to 4 (e). It is good also as open shapes, such as character shape, rectangular shape, and L shape. The planar shape of the tip 7f of the protrusion 7e shown in FIGS. 4A to 4E is the side surface of FIGS. 5 and 6 according to, for example, the peripheral shape of the mount 27 of the engine 17 to which the electric compressor 1 is attached. As shown in the figure, an appropriate shape can be selected.

  Further, as shown in the partially cutaway side view of FIG. 7, the protrusion 7e is separated from the mounting leg 7a and separated, and the bottom 31a is brought into contact with the mounting leg 7a on the side opposite to the mount 27 side. Alternatively, a bottomed cylindrical load receiving member 31 (corresponding to a protruding member in claims) may be used. In this case, the locking portion 7d is also separated from the mounting leg 7a, and the bottom 31a of the load receiving member 31 functions as the locking portion 7d, and corresponds to the tip 31b of the load receiving member 31 (corresponding to the tip of the protruding member in the claims). ) Functions as the tip 7f of the protrusion 7e.

  Further, instead of directly contacting the contact portion 7c of the mounting leg 7a with the mount 27 of the engine 17, as shown in FIG. 7, the mount 27 of the engine 17 as a member constituting the mounting target of the electric compressor 1 together with the mount 27. The contact portion 7c of the mounting leg 7a, which is formed as small as the relay member 33, may be brought into contact with the tip 33a of the cylindrical relay member 33 standing upright.

  In this case, the through hole 33b of the relay member 33 is communicated with the through hole 7b of the mounting leg 7a, the shaft portion 25c of the mounting bolt 25 is inserted into the through holes 7b and 33b, and the screw portion 25b of the mounting bolt 25 is inserted. Fasten to the mount 27.

  Further, as shown in the front view of FIG. 8, the cover member 35 may be attached to the mount 27 of the engine 17 by the attachment bolt 25 together with each attachment leg 7 a.

  When the cover member 35 is attached, the cover member 35 extends between the tips 7f of the projections 7e of the attachment legs 7a of the housing 7 (tips 31b of the load receiving member 31). Therefore, even if the external force from the radiator 19 is transmitted to a position different from the position of any of the mounting legs 7a, the external force is received by the cover member 35 and transmitted to each mounting leg 7a.

  For this reason, even if the position of the external force from the radiator 19 deviates from the position of the mounting leg 7a, the external force can be transmitted to the mount 27 of the engine 17 via the mounting leg 7a to protect the electric compressor 1.

  In the embodiment described above, the housing 7 of the electric compressor 1 has been described as an example of the configuration in which the housing 7 of the electric compressor 1 is attached to the mount 27 of the engine 17 at the three attachment legs 7a, but there are a plurality of attachment legs 7a. May be. Further, the mounting bolts 25 that attach the cover member 35 to the head portion 25b with the fixing bolts 29 may be part of the mounting bolts 25 (including a single one) instead of the mounting bolts 25 of all the mounting legs 7a.

  Furthermore, the present invention is not limited to the electric compressor 1 housed between the left and right side members 13 and 13 in the engine room 11 of the hybrid vehicle (HEV) 10 as in the above-described embodiment, but with other vehicles. The present invention can be widely applied to an electric compressor housed in a place where an excessive external force may be applied due to a collision or the like.

  The present invention can be used in an electric compressor in which a refrigerant compression mechanism is driven by an electric motor.

DESCRIPTION OF SYMBOLS 1 Electric compressor 3 Compression mechanism 5 Electric motor 7 Housing 7a Mounting leg 7b, 33b Through-hole 7c Contact part 7d Locking part 7e Projection part (projection member)
7f Tip (tip of protruding member)
DESCRIPTION OF SYMBOLS 9 Drive circuit 10 Vehicle 11 Engine room 13 Side member 15 Motor generator 17 Engine 19 Radiator 21 Bumper apron 25 Mounting bolt (mounting member)
25a Head 25b Screw part 25b Head 25c Shaft part 27 Mount (target)
29 Fixing bolt 31 Load receiving member (projection member)
31a Bottom 31b Tip (tip of protruding member)
33 Relay member (attachment target)
33a tip 33b through hole 35 cover member

Claims (4)

In the electric compressor (1) in which the refrigerant compression mechanism (3) and the electric motor (5) for driving the compression mechanism (3) are accommodated in the housing (7),
A mounting leg (7a) formed integrally with the housing (7) and abutting against a mounting object (27, 33) of the housing (7);
The attachment leg (7a) brought into contact with the attachment object (27, 33) is fastened to the attachment object (27, 33) in a state of being locked to the attachment leg (7a). 27, 33) mounting members (25) to be attached;
Projection members (7e, 7b) extending from the mounting legs (7a) to the opposite side of the mounting object (27, 33) and having tips (7f, 31b) disposed outside the outer shape of the housing (7). 31) and
An electric compressor (1) comprising:   The electric compressor (1) according to claim 1, wherein the protruding member (7e) is formed integrally with the mounting leg (7a).   The housing (7) has a plurality of mounting legs (7a) that are respectively attached to the mounting objects (27, 33) by a plurality of mounting members (25). The electric compressor (1) according to claim 1 or 2, wherein the protruding members (7e, 31) are respectively extended on the side opposite to the object (27, 33).   The cover member (35) which is attached to the tip (7f, 31b) of the protruding member (7e, 31) and covers the housing (7) from the side opposite to the attachment target (27, 33). The electric compressor (1) according to 2 or 3.

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