JP5609659B2 - High-pressure unit housing - Google Patents

Description

  The present invention relates to a high-voltage unit housing case, and more particularly to a high-voltage unit housing case made of a conductive material that houses therein a high-voltage unit, which is a high-voltage member.

  A vehicle equipped with a rotating electrical machine is provided with a high voltage circuit such as an inverter. The high-voltage circuit is housed in a metal housing with appropriate strength while taking into account electrical protection, taking into account protection from external impact, separation of the high-voltage part from the outside, cooling, etc. .

  For example, Patent Literature 1 describes three bolts as a fixing structure of an inverter that is a vehicle-mounted device. When the inverter is pressed from the front side to the rear side of the vehicle body with a predetermined pressing force, the bolt that stops between the fixing member breaks, and the notch provided in the side member fixing portion It is stated that the bolt that stops between the two is removed from the notch, the bolt that stops between the slits provided in the guide member is removed from the slit, and the inverter moves to the rear side of the vehicle body. Thereby, the impact resistance of the inverter is achieved.

  Patent Document 2 describes a buffer structure that protects the radiator core support from moving backward and interfering with the inverter when the hybrid vehicle collides with the front. Here, it is disclosed that a shock-absorbing member such as an inverter protection bumper is provided via a bracket while a gap is formed between the front surface of the inverter and a radiator core support. It is also described that an engine control unit and a resonator that is an intake device are used instead of the inverter protection bumper.

  As a technique related to the present invention, Patent Document 3 discloses that a case body of a power conversion device is formed by die casting in which aluminum or an aluminum alloy is poured into a mold at a high pressure in a molten state. It is pointed out that warpage occurs when the temperature drops and warping correction processing is necessary. Here, it is stated that in order to increase the rigidity of the predicted warpage occurrence portion, the thickness of the portion is increased or a lattice-like rib is provided.

JP 2009-90818 A JP 2006-117051 A JP 2010-232487 A

  A housing that houses a high-voltage unit such as an inverter is often made of a metal material having an appropriate strength in consideration of impact resistance. However, in some cases, the housing may be damaged due to an external impact. In that case, if the debris of the case enters the inside of the case, an unexpected short circuit between the high-pressure unit and the case may occur due to the case debris that is a metal piece, for example. If a short circuit occurs between the high-voltage unit and the housing, there is a risk of high current leaking to the housing.

  The objective of this invention is providing the high voltage | pressure part storage housing | casing which can suppress that a fragment | piece reaches | attains a high voltage | pressure part, even if damaged by an impact.

High-pressure part housing a housing according to the present invention is composed of a conductive material, and the wall that is to receive the impact having a projecting portion of the impact expected site to be expected, there inside space surrounded by the wall portion Te, a high pressure portion disposed in the high-pressure part arrangement region that defines Me pre, and provided with an internal space for accommodating an insulated wire positioned in the internal space corresponding to at least the projecting portion, the projecting portion of the wall portion, a predetermined The two members having a width dimension and a predetermined wall thickness are configured in a rib shape intersecting each other in an X shape, and the wall thickness of each member constituting the rib shape is greater than the wall thickness of other portions of the wall portion. Further, the gap dimension between the insulated wires is set to be smaller than the width dimension of the rib shape and smaller than the wall thickness of the protruding portion .

Further, in the high-pressure unit housing case according to the present invention, assuming the impact force received from the outside as the assumed impact force, predicting the failure mode of the protruding portion of the wall portion, and predicting the fragment of the protruding portion predicted from the predicted failure mode advance separately previously obtained size as a supposed fragment size, a predetermined width of the protrusion is set to a larger dimension than the dimensions of the envisaged debris size that is separately determined preferably Rukoto.

In the high-pressure unit housing according to the present invention, it is preferable that the upper housing and the lower housing molded by die casting are combined and integrated into a closed container using aluminum or an aluminum alloy as a material .
Moreover, in the high voltage | pressure part storage housing | casing which concerns on this invention, it is preferable that the wall thickness of the wall part of parts other than a protrusion part is several mm.

  With the above configuration, when the wall portion of the high-pressure unit housing case is expected to receive an impact, the wall portion of the shock predicted portion is expected to receive a shock when the predicted impact portion is a fragment due to an assumed impact force of a size assumed in advance. The debris has a wall thickness that is set to be equal to or greater than a predetermined assumed debris size, and in the internal space of the housing, the assumed debris size is between the expected impact portion of the wall and the high-pressure portion placement site. A debris passage restraining member that prevents the debris from passing through is disposed. Thereby, even if a housing | casing is damaged by an impact, it can suppress that a fragment | piece reaches | attains a high voltage | pressure part.

  The debris passage restraining member is an insulating wiring arranged in the storage space. Therefore, by devising the arrangement of the internal broken line, even if the housing is damaged by an impact, it is possible to effectively prevent the fragments from reaching the high pressure portion.

  In addition, the portion of the wall portion where the impact is expected is such that the thick wall portion has a rib shape, and the width of the rib shape is larger than the size of the assumed fragment size. Since the wall thickness of the predicted impact site is thicker than other sites, the impact resistance is high. However, even if the impact is temporarily damaged, the fragments often have the wall thickness or the width of the rib shape. By setting it as the said structure, since the magnitude | size of a fragment becomes larger than an assumed fragment size, a fragment will not pass through a fragment passage suppression member.

  Moreover, the impact | shock prediction site | part of a wall part is a rib shape where the thick part of a wall cross | intersects in X shape. By using the X-shaped ribs, the strength of the portion that receives the impact can be intensively increased, and even if the portion is damaged, it is possible to prevent the fragments from becoming smaller than the width of the rib.

It is a figure explaining the structure of the high voltage | pressure part storage housing | casing of embodiment which concerns on this invention. It is a figure explaining the structure of the high voltage | pressure part in embodiment which concerns on this invention. It is a figure explaining the result of having done the impact test about the high voltage | pressure part storage housing | casing of embodiment which concerns on this invention. In order to compare with FIG. 3, it is a figure explaining the result of having performed the same impact test about the high voltage | pressure part storage housing | casing of a prior art.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In the following, the high-voltage unit housing case will be described as being mounted on a vehicle. However, the high-voltage unit housing case is a case that houses a high-voltage unit that becomes a high voltage, and has a possibility of receiving an external impact. It does not have to be mounted on a vehicle. For example, it may be installed at a high place and may receive a drop impact. In the following, a high-voltage power supply circuit including a converter, an inverter, and the like will be described as the high-voltage unit. However, this is an illustrative example, and for example, only an inverter may be used.

  In addition, materials, shapes, dimensions, and the like described below are exemplifications for explanation, and can be appropriately changed according to the specifications of the high-pressure unit housing.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram for explaining the structure of a high-voltage unit housing case 10 for housing a high-voltage power supply circuit 20 mounted on a vehicle. FIG. 1 shows a front view, a plan cross-sectional view, and a side cross-sectional view of the high-pressure unit housing case 10. FIG. 2 is a diagram illustrating the configuration of the high voltage power supply circuit 20. The plan sectional view of FIG. 1 shows a state in which the high-voltage unit storage housing 10 is cut at a height approximately half the height of the front view, and the side cross-sectional view shows the internal space of the high-pressure unit storage housing 10. 14 shows a state in which main components in the high-voltage power supply circuit 20 arranged at 14 are connected and cut.

  The high-pressure unit housing 10 is made of an aluminum or aluminum alloy as a material, and an upper housing and a lower housing molded by die casting are combined and integrated into a sealed container shape. The high-pressure unit housing 10 includes a wall 12 having a thickness of about several millimeters and an internal space 14 surrounded by the wall 12. Aluminum or an aluminum alloy is used because it is a material having both light weight and appropriate strength. Instead of aluminum or aluminum alloy, a material having appropriate rigidity and strength may be used. For example, what was molded into a predetermined shape using a metal material such as a cast iron material can be used as the high-pressure unit housing case 10.

  The high-voltage unit disposed and accommodated in the internal space 14 is a component that becomes a high voltage, specifically, a high-voltage component that constitutes the high-voltage power supply circuit 20. As shown in FIG. 2, the high voltage power supply circuit 20 is a power supply circuit that is connected between the power storage device 22 and the rotating electrical machine 24 and operates at a high voltage of several hundred volts.

  Here, the power storage device 22 is a chargeable / dischargeable high-voltage power storage device. As the power storage device 22, a secondary battery such as a lithium ion assembled battery or a nickel hydride assembled battery, or a high voltage capacitor can be used. The assembled battery is obtained by combining a plurality of batteries each having a terminal voltage of 1 V to several V, called a single battery or a battery cell, to obtain the predetermined terminal voltage. The voltage between both terminals of the power storage device 22 is, for example, about 200V.

  The rotating electrical machine 24 is a motor / generator (M / G) mounted on a vehicle, and functions as a motor when power is supplied from a power supply circuit unit including an inverter 34, and is driven by an engine (not shown). Alternatively, it is a three-phase synchronous rotating electric machine that functions as a generator during braking of a vehicle.

  The voltage converter 28 of the high voltage power supply circuit 20 is a circuit that is arranged between the power storage device 22 and the inverter 34 and has a DC voltage conversion function, also called a converter. The voltage converter 28 includes a reactor and a switching element. As the voltage conversion function, the voltage on the power storage device 22 side is boosted using the reactor energy storage action and supplied to the inverter 34 side, and the power from the inverter 34 side is stepped down to the power storage device 22 side for charging. And a step-down function for supplying electric power. The boosted voltage supplied to the inverter 34 is, for example, about 600V.

  The smoothing capacitors 26 and 30 are capacitive elements that have a function of smoothing the voltage and current on the power storage device 22 side and the inverter 34 side, respectively.

  The inverter 34 is a circuit connected to the rotating electrical machine 24 and includes a plurality of switching elements, reverse connection diodes, and the like, and has a function of performing power conversion between AC power and DC power. That is, when the rotating electrical machine 24 functions as a generator, the inverter 34 has an AC / DC conversion function that converts AC three-phase regenerative power from the rotating electrical machine 24 into DC power and supplies it as a charging current to the power storage device 22 side. . Further, when the rotating electrical machine 24 functions as a motor, it has an orthogonal conversion function that converts DC power from the power storage device 22 side into AC three-phase driving power and supplies the AC power to the rotating electrical machine 24 as AC driving power.

  The discharge resistor 32 is a resistance element for discharging the electric charge accumulated in the smoothing capacitor 30 when the operation of the high voltage power supply circuit 20 is stopped.

  The high-voltage unit is a component having a high voltage of several hundred volts, such as the voltage converter 28, the inverter 34, the smoothing capacitors 26 and 30, and the discharge resistor 32. The high-pressure part is stored in a predetermined high-pressure part arrangement site in the internal space 14 surrounded by the wall part 12 of the high-pressure part storage housing 10. Note that the internal wiring 36 shown in the side sectional view of FIG. 1 is a high-voltage wiring that is a wiring member of the high-voltage power supply circuit 20 and whose outer periphery is insulated.

  Returning to FIG. 1 again, the high-pressure unit housing 10 forms an internal space in which the high-pressure unit is arranged with a wall portion 12 having a suitable wall thickness in order to protect the high-voltage unit from external impacts. When the high-pressure unit housing case 10 is mounted on a vehicle, the direction of impact received by a vehicle collision or the like can be predicted to some extent depending on the mounting position. Therefore, the wall thickness is increased in the wall portion 12 so as to increase the rigidity of the predicted impact portion that is expected to receive an impact, compared to other portions.

  The central protrusion 40 in the front view of FIG. 1 is a part that is susceptible to external impact when the vehicle collides with a pole provided on the road. Therefore, this is set as a predicted impact portion 16, and the wall thickness of that portion is set to be thicker than the wall thickness of other portions. Specifically, as shown in the front view of FIG. 1, the protruding portion 40 has a rib shape that intersects in an X shape. That is, it is a rib having a thick wall at the X-shaped portion.

  In addition, the internal wiring 36 disposed in the internal space 14 at the protruding portion 40 of the high-voltage unit storage housing 10 is temporarily broken in the internal space 14 when the protruding portion 40 is damaged by impact. It is arranged so as not to enter. That is, the internal wiring 36 disposed in the internal space 14 at the protruding portion 40 is used as a fragment passage prevention member. When the internal wiring 36 is insufficient as a fragment passage prevention member, a mesh-like heat-resistant insulating net or the like may be disposed as the fragment passage prevention member.

  The wall thickness of the protrusion 40, the width of the rib shape, and the arrangement of the internal wiring 36 as a fragment passage prevention member are set as follows so that the fragments do not enter the internal space 14. That is, the impact force that the vehicle receives in a collision or the like is assumed in advance based on the specifications of the vehicle. The magnitude of the impact force assumed in advance is assumed to be the assumed impact force. Then, when the assumed impact force is applied to the protruding portion 40 that is the predicted impact portion 16, the rigidity of the protruding portion 40 and the breaking strength are determined using the wall thickness of the protruding portion 40 and the width of the rib shape. Predict the destruction mode. The prediction of the failure mode can be obtained by performing a simulation calculation, an impact test called a pole side impact test, or a static compression test corresponding thereto.

  Next, the magnitude | size of the fragment of the protrusion part 40 estimated from destruction mode is estimated. The predicted fragment size is assumed to be the assumed fragment size. The arrangement of the internal wirings 36 is set so that the dimension of the gap between the internal wirings 36 and the dimension of the gap between the internal wiring 36 and the wall portion 12 are smaller than the assumed fragment size. As described above, when the protruding portion 40 has an X-shaped rib shape, the minimum dimension of the assumed fragment size is often the wall thickness or the width dimension of the rib shape. For example, the wall thickness of the protruding portion 40 is made thicker than the gap size in the internal wiring 36, and the width of the rib shape of the protruding portion 40 is made larger than the gap size in the internal wiring 36, thereby increasing the size of the fragments. It can be made larger than the assumed fragment size.

  By doing so, even when the projecting portion 40 receives the assumed impact force and the projecting portion 40 becomes a fragment, it is effective that the fragment passes through the gap in the internal wiring 36 which is a fragment passage inhibiting member. Can be suppressed.

  The effect of the above configuration will be described with reference to FIG. Here, the result of investigating the state of damage to the high-pressure unit housing 10 by applying a static compression force to the projecting portion 40 using a rigid jig so as to correspond to the pole-side crash test of a predetermined specification. It is shown. For comparison, FIG. 4 shows a result when the same evaluation is performed using the high-pressure unit housing 11 having the structure of the prior art. In the structure of the prior art, the protruding portion 50 is not provided with a rib shape, and the wall thickness of the protruding portion 50 is the same as the wall thickness of other portions.

  The upper diagram of FIG. 3 is a front view of the high-voltage unit housing case 10 in the initial state, and is the same as the front view of FIG. The lower diagram is a diagram illustrating a state after applying a predetermined static compression force to the protrusion 40 using a rigid jig. As shown in FIG. 3, the protrusion 40 has a crack 42 in the width direction in the X-shaped rib shape, but is not damaged until a fragment is generated. From the results shown in FIG. 3, assuming that fragments are generated from the cracks, the estimated size of the fragments was about 60 mm × 45 mm × 7 mm.

  In FIG. 4 of the comparative example, the upper diagram is an initial state before applying the static compression force. The middle figure is a diagram showing a state after applying a predetermined static compression force to the protrusion 50 using a rigid jig. As shown here, the portion corresponding to the protrusion 50 is broken, and the cavity 52 is opened. The lower part of FIG. 4 is a view showing a state of a plurality of pieces 54, 56, and 58 generated in association with the formation of the cavity. The fragment 54 is a wall portion corresponding to most of the cavity 52, and the fragment 56 is a fragment that is smaller than the fragment 56 but has a certain size. The fragment 58 is a small fragment having a size corresponding to the wall thickness of the wall portion 12. The dimension of the smallest piece 58 was 20 mm × 10 mm × 10 mm.

  In addition, when the pole-side collision test with a predetermined specification was performed on the high-voltage housing case 11 of the prior art, almost the same destruction as in FIG. 4 occurred at the projection 50, and a cavity was formed. Debris was generated. From this result, the static compression force application test using the above-mentioned rigid jig may be considered as a test having the same content as the pole-side collision test with a predetermined specification.

  Thus, in the high voltage | pressure part storage housing | casing 11 of a prior art, the small fragment 58 about 20 mm x 10 mm x 10 mm arises by an impact. Such small debris 58 easily enters the internal space of the high-pressure unit storage housing 11, contacts the high-pressure unit disposed in the internal space, and is between the high-pressure unit and the inner wall of the high-pressure unit storage housing 11. There is a risk of causing a short circuit. On the other hand, as shown in FIG. 3, in the high-pressure unit housing case 10 having the rib-shaped projecting portion 40, a crack 42 is generated but no debris is generated. The size of debris that can be generated from the crack is about 60 mm × 45 mm × 7 mm, which is about 10 times larger in volume than the debris 58 generated in the case of the prior art. And the internal wiring 26 is arrange | positioned in the internal space 14 so that the fragment | piece of this magnitude | size may not pass. Since the size of the debris can be made significantly larger than that of the prior art, the internal wiring 26 effectively acts as a debris passage deterring member, and the debris can be sufficiently deterred from entering the internal space 14.

  The high-voltage unit storage housing according to the present invention can be used as a housing for storing a high-voltage power supply circuit mounted on a vehicle.

  10, 11 High-voltage unit housing case, 12 walls, 14 internal space, 16 impact expected part, 20 high voltage power supply circuit, 22 power storage device, 24 rotating electrical machine, 26, 30 smoothing capacitor, 28 voltage converter, 30 smoothing capacitor , 32 Discharge resistance, 34 Inverter, 36 Internal wiring, 40, 50 Protrusion, 42 Crack, 52 Cavity, 54, 56, 58 Debris.

Claims (4)

Is made of a conductive material, and the wall that is to receive the impact having a projecting portion of the impact expected site to be expected,
An internal space surrounded by the wall portion, and an internal space for accommodating the high-pressure portion disposed in the high-pressure part arrangement region that defines Me pre, and an insulating wire which is disposed in an internal space corresponding to at least the projecting portion,
With
The protruding portion of the wall portion is configured in a rib shape in which two members having a predetermined width dimension and a predetermined wall thickness intersect each other in an X shape, and the wall thickness of each member constituting the rib shape is the wall portion Thicker than the wall thickness of other parts,
A high-pressure unit housing case , wherein a gap between insulating wires is set to be smaller than a rib-shaped width and smaller than a wall thickness of a protruding portion . In the high voltage | pressure part storage housing | casing of Claim 1,
Assume the impact force received from the outside as an assumed impact force, predict the failure mode of the protruding portion of the wall, and separately determine the size of the protruding fragment predicted from the predicted failure mode as the assumed fragment size beforehand. ,
Predetermined width is set than the size of the separately determined was assumed debris magnitude larger dimensions pressure portion housing case, wherein Rukoto protrusions. In the high voltage | pressure part storage housing | casing of Claim 1 ,
A high-pressure unit housing case characterized by combining an upper housing and a lower housing molded by die casting using aluminum or an aluminum alloy as a material and combining them into a closed container shape .   In the high voltage | pressure part storage housing | casing of Claim 1,
  The wall thickness of the wall part other than the projecting part is several mm, and the high-pressure part housing case.

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